JP4811237B2 - Device for measuring operating characteristics of rotating linear motion conversion mechanism - Google Patents

Description

  The present invention relates to a rotational linear motion conversion mechanism that converts rotational motion into linear motion, and relates to an operation characteristic measuring device for the rotational linear motion conversion mechanism used for measuring the conversion efficiency of work.

The rotary linear motion conversion mechanism includes an annular shaft provided with an internal thread on the inner circumference side, a solar axis disposed within the annular axis and provided with an external thread on the outer circumference side, and a circumference of the sun axis within the annular axis. It is configured by a combination with a plurality of planetary shafts that are arranged and provided with external threads on the outer peripheral side. Further, the female screw of the annular shaft, the male screw of the sun shaft, and the male screw of the planetary shaft are engaged with each other. When the ring axis is rotated, the planetary axis moves around the sun axis through the force transmitted from the ring axis, thereby obtaining a linear movement of the sun axis. In addition, as a conventional rotation linear motion conversion mechanism, the thing of patent document 1 is known, for example.
JP-A-10-196757

  By the way, in the rotational linear motion conversion mechanism, when a force that tilts the sun axis with respect to the annular axis acts on the sun axis, this force may be transmitted from the sun axis to the planetary axis, which may cause screw damage. Therefore, the inventor of the present application is considering to configure a rotating linear motion conversion mechanism including a bearing for regulating the inclination of the sun axis with respect to the annular axis. In the rotary linear motion conversion mechanism having such a configuration, a bearing is provided so as to rotate integrally with the annular shaft. And when the force that tilts the sun axis with respect to the annular axis works, the tilt of the sun axis is regulated through the contact between the sun axis and the bearing before the tilting force is transmitted to the planetary axis. The occurrence of damage is suppressed.

  On the other hand, the rotation linear motion conversion mechanism may be assembled in a state where the work conversion efficiency, that is, the ratio of the work of the solar shaft to the work of the annular shaft is lower than the reference efficiency (required work conversion efficiency). Further, such a decrease in conversion efficiency basically occurs because the elements constituting the rotary linear motion conversion mechanism are not properly combined. Therefore, it is possible to determine whether or not each component is appropriately combined based on the comparison between the measured work conversion efficiency and the reference efficiency.

  Therefore, the inventor of the present application has a function of inputting torque to the ring shaft and the ring shaft in order to realize the inspection of the assembled state based on the work conversion efficiency of the rotary linear motion conversion mechanism provided with the bearing. Measuring device having a function of measuring the magnitude of the torque input to the solar shaft, a function of inputting a thrust load to the solar shaft, and a function of measuring the magnitude of the load input to the solar shaft An attempt was made to measure work conversion efficiency through an operation characteristic measurement device (basic measurement device) composed of Specifically, the magnitude of the torque and the load when the annular shaft was rotated over a specified number of rotations through a torque measuring device was measured, and the work conversion efficiency was calculated based on these measurement results.

  Here, FIG. 23 shows an example of a curve (characteristic curve) showing a tendency of change in torque with respect to the load obtained through the measurement test. In the figure, a characteristic curve A indicates a characteristic curve that appropriately reflects the operation characteristics of the rotating linear motion conversion mechanism, and a characteristic curve B indicates a characteristic curve obtained through the measurement test. As shown in the figure, according to the measurement test, it was confirmed that a characteristic curve B having a tendency greatly different from that of the characteristic curve A was obtained. As described above, in the measuring apparatus having the above-described structure, a change in torque with respect to the load cannot be accurately grasped, so there is still room for improvement.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an operation characteristic measuring device for a rotational linear motion conversion mechanism that can accurately measure the work conversion efficiency of the rotational linear motion conversion mechanism. It is to provide.

In the following, means for achieving the above object and its effects are described.
(1) The invention according to claim 1 is arranged around the solar axis in the annular axis, an annular axis in which a space is provided, a solar axis arranged in the annular axis. And a planetary shaft provided to rotate integrally with the annular shaft and supporting the sun shaft, and through the planetary motion of the planetary shaft accompanying the rotational motion of the annular shaft. Regarding the rotational linear motion conversion mechanism configured on the condition that the linear motion of the sun axis is obtained, in the operating characteristic measuring device of the rotational linear motion conversion mechanism used for measuring the conversion efficiency of the work, the annular shaft A first measuring device having a function of inputting torque into the ring shaft and a function of measuring the magnitude of the torque input to the annular shaft, a function of inputting a thrust load to the sun shaft, and an input to the sun shaft The magnitude of the thrust load Including a second measuring device provided with a function to measure, a load mechanism for generating a thrust load for the second measuring device, and the load mechanism and the sun shaft. Including a connecting mechanism for transmitting force between the first connecting mechanism connected to the sun shaft and the second connecting mechanism connected to the load mechanism. And the first connecting mechanism and the second connecting mechanism are configured to be relatively movable in the radial direction of the sun shaft.

  In the rotational linear motion conversion mechanism, a clearance is formed between the sun shaft and the bearing. Assuming that the inner peripheral surface of the bearing is a perfect circle (perfect circle), when the center line of the sun axis and the center line of the bearing are aligned, the clearance size is around the center line. It becomes constant at. On the other hand, assuming that the inner peripheral surface of the bearing is an incomplete circle, even if the center line of the sun axis is aligned with the center line of the bearing, the clearance is around the center line. It is not constant. On the other hand, when measurement of work conversion efficiency is performed in a state in which the attitude of the rotating linear motion conversion mechanism is set to the attitude along the horizontal direction of the sun axis, for example, the sun axis moves so as to fill the clearance with the bearing. For this reason, the center line of the sun axis and the center line of the bearing are not aligned. In this state, when rotation is input to the annular shaft without the sun shaft being connected to the operating characteristic measuring device, the portion having a relatively small inner diameter in the bearing along with the rotation of the annular shaft is the sun shaft. By contacting, a force (lateral force) for moving the solar axis in the radial direction is applied to the solar axis. At this time, since the solar axis is not connected to the motion characteristic measuring device, a force that prevents the lateral movement of the solar axis in the radial direction is not applied from the motion characteristic measuring device to the solar axis. However, it is avoided that the friction between these elements increases excessively even though the bearing and the bearing are in contact. On the other hand, when the conversion efficiency is measured through the above-described basic measurement device with the rotary linear motion conversion mechanism set to the above posture, one end of the sun shaft is fixed to the load measurement device. For this reason, when a lateral force is applied to the solar axis, a force is generated that prevents the solar axis from moving in the radial direction. Thereby, unlike the above case, the friction between the sun shaft and the bearing is increased, so that the conversion efficiency cannot be accurately measured due to the friction. For this reason, in order to accurately measure the conversion efficiency, it is appropriate to configure the operating characteristic measurement device so that the radial movement of the sun shaft due to the contact between the sun shaft and the bearing is not hindered. Conceivable. In the invention described in the above claim, based on such an idea, the coupling mechanism is configured so that the first coupling mechanism can move in the radial direction of the sun axis with respect to the second coupling mechanism. When a lateral force is applied to the sun axis, the sun axis and the first coupling mechanism are integrated, and the second coupling mechanism and the load mechanism are allowed to move in the radial direction of the sun axis. That is, it is avoided that the movement of the solar shaft in the radial direction due to the lateral force is hindered through the load mechanism. Thereby, since the increase in the friction between the sun shaft and the bearing at the time of measuring the work conversion efficiency is suppressed, the work conversion efficiency can be accurately measured.

  (2) The invention according to claim 2 is the operation characteristic measuring apparatus for the rotational linear motion conversion mechanism according to claim 1, wherein the connection mechanism is between the first connection mechanism and the second connection mechanism. The third coupling mechanism is configured to include a third coupling mechanism for transmitting force, and the third coupling mechanism is a sliding resistance that accompanies relative movement between the first coupling mechanism and the second coupling mechanism. The gist of the invention is that it can be made smaller.

  According to the invention described in the above-mentioned claim, the sliding resistance accompanying the relative movement of the first coupling mechanism and the second coupling mechanism, that is, the force that hinders the radial movement of the sun shaft is reduced. Work conversion efficiency can be measured more accurately.

  (3) The invention described in claim 3 is the operation characteristic measuring device of the rotational linear motion conversion mechanism according to claim 2, wherein the third connection mechanism is a combination of the first connection mechanism and the second connection mechanism. The gist is that it is configured to include a sphere that rolls with relative movement.

  (4) The invention according to claim 4 is the operation characteristic measuring device for the rotational linear motion conversion mechanism according to any one of claims 1 to 3, wherein the sun shaft is fastened with respect to the first coupling mechanism. In order to arrange the first transmission body with respect to the second connection mechanism, including a first connection body for the first connection body and a first transmission body fixed to one end of the connection body And a relative movement in the radial direction of the sun axis with respect to the second transmission body, and a second transmission body fixed to the connection body. Is configured so that it can be combined with the first connector in a state in which the first connector is allowed, and with respect to the connection mechanism, the first connector and the Condition 1 is that the second transmitter is combined, The condition 2 is that the first transmission body is attached to one end of the first connection body in a state where 1 is satisfied, and the first transmission body is the second connection body in a state where the condition 2 is satisfied. It is assumed that the second transmission body is fixed to the second connected body in a state in which the condition 3 is satisfied, and that the condition 4 is satisfied. The gist is that the components are combined.

  (5) The invention according to claim 5 is the operation characteristic measuring device for the rotational linear motion conversion mechanism according to claim 4, wherein one end of the solar shaft is arranged for the first connected body. A first cylinder and a first connecting shaft for mounting the first transmission body; a second cylinder for mounting the second transmission body on the second connection body; and the load mechanism. The gist is that a second connecting shaft for connection is provided.

  (6) The invention according to claim 6 is an annular shaft provided with a space inside, a solar shaft disposed in the annular shaft, and disposed around the solar shaft in the annular shaft. And a planetary shaft provided to rotate integrally with the annular shaft and supporting the sun shaft, and through the planetary motion of the planetary shaft accompanying the rotational motion of the annular shaft. Regarding the rotational linear motion conversion mechanism configured on the condition that the linear motion of the sun axis is obtained, in the operating characteristic measuring device of the rotational linear motion conversion mechanism used for measuring the conversion efficiency of the work, the annular shaft A first measuring device having a function of inputting torque into the ring shaft and a function of measuring the magnitude of the torque input to the annular shaft, a function of inputting a thrust load to the sun shaft, and an input to the sun shaft The magnitude of the thrust load Including a second measuring device provided with a function to measure, a load mechanism for generating a thrust load for the second measuring device, and the load mechanism and the sun shaft. Including a connecting mechanism for transmitting force between them, and with respect to the connecting mechanism, the solar shaft is radially aligned with the contact between the bearing and the sun shaft due to the rotation of the annular shaft. The gist of the invention is that the load mechanism and the solar shaft can be allowed to move relative to each other in the radial direction of the solar shaft when a force to move to the solar shaft is applied. Yes.

  In the invention described in the above claims, since the coupling mechanism is configured to allow relative movement between the load mechanism and the solar axis in the radial direction of the solar axis, a lateral force acts on the solar axis. Then, the movement of the solar shaft in the radial direction due to the lateral force is prevented from being hindered through the load mechanism. Thereby, since the increase in the friction between the sun shaft and the bearing at the time of measuring the work conversion efficiency is suppressed, the work conversion efficiency can be accurately measured.

  (7) The invention according to claim 7 is the operation characteristic measuring device of the rotational linear motion conversion mechanism according to any one of claims 1 to 6, wherein the rotational linear motion conversion mechanism is a member of the annular shaft. A female screw is provided on the inner peripheral side, a male screw is provided on the outer peripheral side of the sun shaft, a male screw is provided on the outer peripheral side of the planetary shaft, a female screw of the annular shaft, and a The gist of the present invention is that the male screw and the planetary shaft are engaged with each other.

  (8) The invention according to claim 8 is the operation characteristic measuring apparatus for the rotational linear motion conversion mechanism according to claim 7, wherein the rotational linear motion conversion mechanism is a first annular ring as an internal gear on the annular shaft. A gear and a second annular gear are provided; a first sun gear and a second sun gear are provided as external gears on the sun shaft; and a first planetary gear and a second planetary gear as external gears on the planetary shaft. A gear is provided, the first annular gear, the first sun gear, and the first planetary gear are meshed, the second annular gear, the second sun gear, and the second planetary gear. The gist is that it is configured on the condition that the gear meshes with the gear.

  (9) The invention according to claim 9 is an annular shaft provided with a space therein, a solar shaft disposed within the annular shaft, and disposed around the solar shaft within the annular shaft. And a planetary shaft provided to rotate integrally with the annular shaft and supporting the sun shaft, and through the planetary motion of the planetary shaft accompanying the rotational motion of the annular shaft. About the rotation linear motion conversion mechanism comprised on condition that the linear motion of a solar axis is obtained, In the operating characteristic measuring method of the rotation linear motion conversion mechanism for measuring the conversion efficiency of the work, Claims 1-8 The gist is that the motion characteristic is measured through the motion characteristic measurement device for the rotational linear motion conversion mechanism according to any one of the above.

  (10) The invention according to claim 10 is the operation characteristic measuring method of the rotational linear motion conversion mechanism according to claim 9, wherein a thrust load is input to the solar shaft through the second measuring device. A step of inputting torque to the annular shaft through the first measuring device to rotate the annular shaft over a predetermined number of rotations; a torque of the first measuring device measured in the step; The gist of the present invention is that it includes a step of calculating the work conversion efficiency of the rotary linear motion conversion mechanism based on the thrust load of the second measuring device.

  An embodiment of the present invention will be described with reference to FIGS. Below, it demonstrates according to the order of the structure of a rotation linear motion conversion mechanism, the operation | movement aspect of the conversion mechanism, the structure of the operation characteristic measuring device of a rotation linear motion conversion mechanism, and the measuring method of an operation characteristic.

[1] “Structure of rotating linear motion conversion mechanism”
With reference to FIG.1 and FIG.2, the structure of the rotation linear motion conversion mechanism 1 is demonstrated.
The rotary linear motion conversion mechanism 1 includes a ring shaft 2 (annular axis) having a space therein, a sun shaft 3 (sun axis) disposed inside the ring shaft 2, and a sun shaft within the ring shaft 2. 3 and a plurality of planetary shafts 4 (planetary shafts) arranged around the periphery of 3. Further, the front collar 11 and the rear collar 14 for supporting the sun shaft 3 are included. The ring shaft 2 and the sun shaft 3 and each planetary shaft 4 are combined so that force is transmitted from one element to the other element through meshing of screws and gears provided in each. The planetary shafts 4 are arranged at equal intervals around the sun shaft 3. The front collar 11 is provided with a plain bearing 12 for supporting the sun shaft 3 and an O-ring 13 for sealing the opening on the front side of the ring shaft 2. In addition, a plurality of oil holes 11H are provided for supplying lubricating oil to locations where the ring shaft 2 and the sun shaft 3 and the planetary shafts 4 are engaged with each other. The back collar 14 is provided with a plain bearing 15 for supporting the sun shaft 3 and an O-ring 16 for sealing the opening on the back side of the ring shaft 2.

  When the force which inclines the center line of the sun shaft 3 with respect to the center line of the ring shaft 2 and each planetary shaft 4 is applied to the sun shaft 3, each of the slide bearings 12 and 15 receives the force from the sun shaft 3. Before being transmitted to the planetary shaft 4, it is provided as an element for regulating the inclination of the sun shaft 3. Thereby, when the tilting force is applied to the sun shaft 3, the tilt of the sun shaft 3 with respect to the ring shaft 2 and each planetary shaft 4 is regulated through contact between the sun shaft 3 and each of the slide bearings 12 and 15. Transmission of the tilting force into the rotary linear motion conversion mechanism 1 is suppressed. Further, it is possible to prevent the meshing between the screw and gear of the sun shaft 3 and the screw and gear of each planetary shaft 4 from becoming excessively non-uniform.

  The rotational linear motion conversion mechanism 1 operates as follows through the combination of the ring shaft 2 and the sun shaft 3 and each planetary shaft 4. That is, when one component of the ring shaft 2 and the sun shaft 3 rotates, each planetary shaft 4 performs a planetary motion around the sun shaft 3 through the force transmitted from the component. Then, the components move in the axial direction with respect to each planetary shaft 4 through the force transmitted from each planetary shaft 4 to the other component of the ring shaft 2 and the sunshaft 3 in accordance with the planetary motion of each planetary shaft 4. . The rotational linear motion conversion mechanism 1 of the present embodiment is configured as a motion conversion mechanism that converts the rotational motion of the ring shaft 2 into the linear motion of the sun shaft 3. In the present embodiment, with respect to the axial direction of the sun shaft 3, the direction in which the sun shaft 3 is pushed out from the ring shaft 2 is the front direction FR, and the direction in which the sun shaft 3 is pulled into the ring shaft 2 is the back direction RR. Yes. Further, when an arbitrary position of the rotary linear motion conversion mechanism 1 is used as a reference, the front direction FR side is set to the front side from the reference position, and the back direction RR side is set to the back side from the reference position.

[2] “Ring shaft structure”
The structure of the ring shaft 2 will be described with reference to FIGS. 3 and 4. FIG. 3 shows a planar structure of the ring shaft 2. FIG. 4 shows the front structure of the ring shaft 2. FIG. 5 shows a cross-sectional structure of the ring shaft 2 along the center line. FIG. 6 shows a cross-sectional structure in which a part of the ring shaft 2 is disassembled.

  The main body (ring shaft main body 21) of the ring shaft 2 is provided with an annular screw 22 formed as an internal thread, and a front ring gear 23 and a rear ring gear 24 formed as internal gears. Further, spur gears having the same shape are provided as the front ring gear 23 and the rear ring gear 24. That is, the specifications of the front ring gear 23 and the rear ring gear 24 are set to be equal to each other. The ring shaft main body 21 is provided with a main body screw portion 21A in which an annular screw 22 is formed, a main body gear portion 21B in which a front ring gear 23 is assembled, and a main body gear portion 21C in which a rear ring gear 24 is assembled. Yes.

  The front ring gear 23 is formed separately from the ring shaft main body 21. Further, when assembled to the ring shaft main body 21, its own center line is configured to match the center line of the ring shaft main body 21. In the present embodiment, the front ring gear 23 is fixed to the ring shaft main body 21 by press-fitting as to how the front ring gear 23 is assembled to the ring shaft main body 21. The front ring gear 23 can also be fixed to the ring shaft main body 21 by a method other than press fitting.

  The rear ring gear 24 is formed separately from the ring shaft main body 21. Further, when assembled to the ring shaft main body 21, its own center line is configured to match the center line of the ring shaft main body 21. In the present embodiment, the back ring gear 24 is fixed to the ring shaft main body 21 by press-fitting as to how the back ring gear 24 is assembled to the ring shaft main body 21. The back ring gear 24 can be fixed to the ring shaft main body 21 by a method other than press fitting.

[3] "Sunshaft structure"
The structure of the sun shaft 3 will be described with reference to FIG. 7A shows a planar structure of the sun shaft 3, and FIG. 7B shows a cross-sectional structure of the sun shaft 3 along the center line.

  A sun screw 32 formed as a male screw and a front sun gear 33 and a rear sun gear 34 formed as external gears are provided on the main body of the sun shaft 3 (sun shaft main body 31). Further, spur gears having the same shape are provided as the front sun gear 33 and the rear sun gear 34. That is, the specifications of the front sun gear 33 and the back sun gear 34 are set to be equal to each other. The sun shaft main body 31 is provided with a main body screw portion 31A in which a sun screw 32 is formed on the outer peripheral surface, a main body gear portion 31B in which a front sun gear 33 is formed, and a main body gear portion 31C in which the rear sun gear 34 is assembled. ing. In addition, a center hole (front side reference hole 31G) formed as a reference for processing the sunshaft body 31 and the sunshaft 3 are formed at the front side end portion (front side end portion 31F) of the sunshaft body 31. A hole 31 </ b> H is provided so as to penetrate through in the radial direction. The hole 31H is formed so that a pin 65 of an operation characteristic measuring device 5 described later can be inserted. Further, the center line is formed so as to be orthogonal to the center line of the sun shaft 3.

  The rear sun gear 34 is formed separately from the sun shaft main body 31. Further, when assembled to the sun shaft main body 31, the center line of the sun shaft main body 31 is aligned with the center line of the sun shaft main body 31. In the present embodiment, the back sun gear 34 is fixed to the sun shaft main body 31 by press-fitting as to how the back sun gear 34 is assembled to the sun shaft main body 31. The rear sun gear 34 can be fixed to the sun shaft main body 31 by a method other than press fitting.

[4] “Planetary shaft structure”
The structure of the planetary shaft 4 will be described with reference to FIG. 8A shows a planar structure of the planetary shaft 4, and FIG. 8B shows a sectional structure of the planetary shaft 4 along the center line.

  A planetary screw 42 formed as a male screw and a front planetary gear 43 and a rear planetary gear 44 formed as external gears are provided on the planetary shaft 4 main body (planetary shaft main body 41). Further, spur gears having the same shape are provided as the front planetary gear 43 and the back planetary gear 44. That is, the specifications of the front planetary gear 43 and the back planetary gear 44 are set to be equal to each other. The planetary shaft main body 41 includes a main body screw portion 41A having a planetary screw 42 formed on the outer peripheral surface, a main body gear portion 41B having a front planetary gear 43 formed thereon, and a main body gear portion 41C to which the rear planetary gear 44 is assembled. Is provided.

  The rear planetary gear 44 is formed separately from the planetary shaft main body 41. Further, the planetary shaft main body 41 is assembled to the planetary shaft main body 41 by inserting the main body gear portion 41C of the planetary shaft main body 41 into the bearing hole 44H. The one end face is assembled to the planetary shaft main body 41 in a state where the end surface is in contact with the planetary shaft main body 41. Further, in the state where it is assembled to the planetary shaft main body 41, its own center line is configured to be aligned with the center line of the planetary shaft main body 41. With respect to the manner of assembling the back planetary gear 44 with respect to the planetary shaft main body 41, in this embodiment, a clearance fit is adopted so that the back planetary gear 44 can rotate with respect to the planetary shaft main body 41. In addition, as an assembling mode for obtaining relative rotation between the planetary shaft main body 41 and the rear planetary gear 44, an assembling mode other than clearance fitting can be employed.

[5] “Relationship between components”
With reference to FIGS. 9-12, the relationship of each component in the rotation linear motion conversion mechanism 1 is demonstrated. FIG. 9 shows a cross-sectional structure of the rotational linear motion conversion mechanism 1 along the center line of the sun shaft 3. FIG. 10 shows a cross-sectional structure of the rotational linear motion conversion mechanism 1 along the DA-DA line in FIG. FIG. 11 shows a cross-sectional structure of the rotational linear motion conversion mechanism 1 along the DB-DB line of FIG. FIG. 12 shows a cross-sectional structure of the rotational linear motion conversion mechanism 1 along the DC-DC line of FIG.

  In the rotary linear motion conversion mechanism 1, the operation of each component is allowed or restricted as shown in (A) below. Further, as shown in the following (B) and (C), the screws and gears of the ring shaft 2 and the sun shaft 3 and each planetary shaft 4 are engaged with each other.

  (A) With respect to the ring shaft 2, relative rotation between the ring shaft main body 21, the front ring gear 23 and the rear ring gear 24 is disabled. Further, relative rotation between the ring shaft main body 21 and the front collar 11 and the rear collar 14 is disabled. With respect to the sun shaft 3, relative rotation between the sun shaft main body 31 and the back sun gear 34 is disabled. With respect to the planetary shaft 4, relative rotation between the planetary shaft main body 41 and the back planetary gear 44 is allowed.

  (B) In the ring shaft 2 and each planetary shaft 4, the ring screw 22 of the ring shaft main body 21 and the planetary screw 42 of each planetary shaft main body 41 are engaged with each other. Further, the front ring gear 23 of the ring shaft main body 21 and the front planetary gear 43 of each planetary shaft main body 41 are engaged with each other. Further, the rear ring gear 24 of the ring shaft main body 21 and the rear planetary gear 44 of each planetary shaft main body 41 are engaged with each other. Thereby, when a rotational motion is input to one of the ring shaft 2 and each planetary shaft 4, the ring screw 22 and the planetary screw 42 mesh, the front ring gear 23 and the front planetary gear 43 mesh, and the back ring. A force is transmitted to the other of the ring shaft 2 and each planetary shaft 4 through the meshing of the gear 24 and the rear planetary gear 44.

  (C) In the sun shaft 3 and each planetary shaft 4, the sun screw 32 of the sun shaft main body 31 and the planetary screw 42 of each planetary shaft main body 41 are meshed with each other. Further, the front sun gear 33 of the sun shaft main body 31 and the front planetary gear 43 of each planetary shaft main body 41 are engaged with each other. Further, the rear sun gear 34 of the sun shaft main body 31 and the rear planetary gear 44 of each planetary shaft main body 41 are engaged with each other. Thus, when rotational motion is input to one of the sun shaft 3 and each planetary shaft 4, the sun screw 32 and the planetary screw 42 are engaged, the front sun gear 33 and the front planetary gear 43 are engaged, and the rear sun gear 34. A force is transmitted to the other of the sun shaft 3 and each planetary shaft 4 through meshing with the rear planetary gear 44.

[6] "Operation mode of rotating linear motion conversion mechanism"
In the rotational linear motion conversion mechanism 1, an operation method (motion conversion method) for converting rotational motion into linear motion is determined based on the setting mode of the number of teeth of each gear and the number of threads of each screw. That is, as a motion conversion method, a solar axis displacement method in which the linear motion of the sun shaft 3 is obtained through the rotational motion of the ring shaft 2, and an annular shaft displacement method in which the linear motion of the ring shaft 2 is obtained through the rotational motion of the sun shaft 3. You can choose either. The following (A) and (B) show the operation modes of the rotating linear motion conversion mechanism 1 in each motion conversion method. In addition, the rotation linear motion conversion mechanism 1 of this embodiment is comprised as a conversion mechanism of a solar axis displacement system.

  (A) When the solar axis displacement method is adopted as the motion conversion method, conversion from rotational motion to linear motion is performed as follows. That is, when rotational motion is input to the ring shaft 2, the front ring gear 23 and each front planetary gear 43 are engaged, the rear ring gear 24 and each rear planetary gear 44 are engaged, and the ring screw 22 and each planetary gear. By transmitting a force from the ring shaft 2 to each planetary shaft 4 through meshing with the screw 42, each planetary shaft 4 revolves around the sun shaft 3 while rotating. Then, in accordance with the planetary motion of the planetary shaft 4, the front planetary gears 43 and the front sun gear 33 are engaged, the rear planetary gears 44 and the rear sun gear 34 are engaged, and the planetary screws 42 and the sun screws 32 are engaged. Through transmission of the force from each planetary shaft 4 to the sunshaft 3, the sunshaft 3 is displaced in the axial direction.

  (B) In the case where the annular shaft displacement method is adopted as the motion conversion method, conversion from rotational motion to linear motion is performed as follows. That is, when rotational motion is input to the sunshaft 3, the front sun gear 33 and each front planetary gear 43 are engaged, the rear sun gear 34 and each rear planetary gear 44 are engaged, and the sun screw 32 and each planetary screw 42. When the force is transmitted from the sun shaft 3 to each planetary shaft 4 through the meshing, the planetary shafts 4 revolve while rotating around the sun shaft 3. In accordance with the planetary motion of the planetary shaft 4, the front planetary gears 43 and the front ring gear 23 are engaged, the rear planetary gears 44 and the rear ring gear 24 are engaged, and the planetary screws 42 and the annular screws 22. When the force is transmitted from each planetary shaft 4 to the ring shaft 2 through the meshing with the ring shaft 2, the ring shaft 2 is displaced in the axial direction.

[7] “Configuration of operating characteristic measuring device”
Referring to FIGS. 13 to 18, an operation characteristic measuring device for measuring the work conversion efficiency of the rotary linear motion conversion mechanism 1, that is, the ratio of the work of the sun shaft 3 to the work of the ring shaft 2 (conversion efficiency H). 5 will be described. FIG. 13 schematically shows the entire structure of the operating characteristic measuring apparatus 5. FIG. 14 shows a planar structure of the coupling mechanism 56 of the operation characteristic measuring apparatus 5. FIG. 15 shows the front structure of the coupling mechanism 56. FIG. 16 shows a cross-sectional structure of the coupling mechanism 56 along the line DD-DD in FIG. FIG. 17 shows a front structure in which a part of the coupling mechanism 56 is removed. FIG. 18 shows a cross-sectional structure of the coupling mechanism 56 in a state where the coupling mechanism 56 is disassembled into components.

  As shown in FIG. 13, the operation characteristic measuring device 5 has a function of inputting torque to the ring shaft 2 and a function of measuring the magnitude of the torque inputted to the ring shaft 2 (first torque measuring device 5A (first). Measuring device), a load measuring device 5B (second measuring device) having a function of inputting a thrust load to the sun shaft 3, and a function of measuring the magnitude of the thrust load input to the sun shaft 3, and a torque An arithmetic device 9 that calculates the conversion efficiency H based on the measurement results of the measuring device 5A and the load measuring device 5B is included. Moreover, it is comprised so that the rotation linear motion conversion mechanism 1 can be attached in the state in which the sun shaft 3 follows a horizontal direction. Hereinafter, the attitude of the rotary linear motion conversion mechanism 1 along which the sun shaft 3 extends in the horizontal direction is set as a reference attitude.

  The torque measuring device 5A includes a motor 51 for rotating the ring shaft 2, a torque measuring device 52 for measuring the magnitude of torque input to the ring shaft 2 through the motor 51, and an output shaft 51A of the motor 51. And a chuck 53 for connecting the ring shaft 2 to each other. The output shaft 51A of the motor 51 and the chuck 53 are connected so as to rotate integrally around the same center line.

  The load measuring device 5B includes a spring mechanism 54 for inputting a thrust load to the sun shaft 3, and a load measuring instrument 55 for measuring the magnitude of the load input to the sun shaft 3 through the spring 54A of the spring mechanism 54. And a connection mechanism 56 for transmitting force between the spring 54A (load measuring device 52) and the sun shaft 3. The spring mechanism 54 is configured such that a thrust load acting in a direction opposite to the reference direction can be input to the sunshaft 3 with the direction in which the sunshaft 3 moves when measuring the conversion efficiency H as a reference direction. ing.

  As shown in FIGS. 14 and 15, the connecting mechanism 56 includes a first connecting mechanism 6 for connecting the sun shaft 3, a second connecting mechanism 7 for connecting the spring 54 </ b> A, and the sun shaft 3. A pin 65 for fastening to one connection mechanism 6 is included. The second coupling mechanism 7 is connected to the spring mechanism 54 so that its center line is aligned with the center line of the spring 54A.

  As shown in FIGS. 16 and 17, the coupling mechanism 56 includes the third coupling mechanism 8 for transmitting force between the first coupling mechanism 6 and the second coupling mechanism 7. . Further, the first coupling mechanism 6 and the second coupling mechanism 7 are configured to be relatively movable in the radial direction of the sun shaft 3 via the third coupling mechanism 8.

  The first coupling mechanism 6 includes a first coupling body 61 for connecting the sun shaft 3, and a first transmission plate 64 for transmitting force between the first coupling body 61 and the second coupling mechanism 7. It is comprised including. The first connecting body 61 is provided with a first cylinder 62 for connecting the sun shaft 3 in cooperation with the pin 65 and a first connecting shaft 63 for attaching the first transmission plate 64. The first connecting shaft 63 and the first transmission plate 64 are combined through screw engagement. The first cylinder 62 and the first connecting shaft 63 are provided so that their centerlines are aligned with each other. The first cylinder 62 is provided with a space 62 </ b> A for arranging the front end 31 </ b> F of the sun shaft 3. Further, a hole 62B for inserting the pin 65 into the hole 31H of the front side end 31F is provided in a state where the front side end 31F of the sun shaft 3 is accommodated in the space 62A. Also, a hole 62C for inserting one end of the pin 65 that has passed through the hole 62B and the hole 31H is provided. The pin 65 is configured to be able to fasten the first coupling mechanism 6 and the sun shaft 3 by being inserted into the holes 62 </ b> B and 62 </ b> C of the first cylinder 62 and the hole 31 </ b> H of the sun shaft 3. Specifically, it is composed of a cylindrical main body 65A and an arc-shaped flange 65B. The flange 65B is provided as an element for restricting the axial movement of the pin 65 relative to the first coupling mechanism 6 when the main body 65A is inserted into the holes 62B and 62C of the first cylinder 62. In the first coupling mechanism 6, when the pin 65 is inserted into the first cylinder 62, the posture of the pin 65 with respect to the first cylinder 62 is determined through contact between the outer peripheral surface of the pin 65 and the inner peripheral surfaces of the holes 62 </ b> B and 62 </ b> C. A state in which changes are regulated is obtained. Further, through the contact between the flange 65B and the first cylinder 62, a state in which the movement of the pin 65 in the axial direction with respect to the first cylinder 62 is restricted is obtained.

  The second coupling mechanism 7 includes a second coupling body 71 for connecting the spring 54 </ b> A, and a second transmission plate 74 for transmitting force between the second coupling body 71 and the first coupling mechanism 6. It is configured to include. The second connecting body 71 is provided with a second cylinder 72 for attaching the second transmission plate 74 and a second connecting shaft 73 for connecting the spring 54 </ b> A via the load measuring device 55. The second cylinder 72 and the second transmission plate 74 are combined through a plurality of bolts 75. The second cylinder 72 and the second connecting shaft 73 are provided so that their centerlines are aligned with each other. The second cylinder 72 is provided with a space 72 </ b> A for arranging the first transmission plate 64 of the first coupling mechanism 6. The inner diameter of the second cylinder 72 is set so that the second cylinder 72 and the first transmission plate 64 can be combined in a state where relative movement is allowed in the radial direction of the sun shaft 3. That is, the inner diameter of the second cylinder 72 is set larger than the outer diameter of the first transmission plate 64. The second transmission plate 74 is provided with a hole 74 </ b> A for inserting the first connection shaft 63 of the first connection mechanism 6. The diameter of the hole 74 </ b> A is set so that the second transmission plate 74 and the first connecting shaft 63 can be combined in a state where relative movement is allowed in the radial direction of the sun shaft 3. That is, the diameter of the hole 74 </ b> A is set larger than the diameter of the first connecting shaft 63.

  The third connecting mechanism 8 includes a first sliding plate 81 and a second sliding plate 82 that move relative to each other in the radial direction of the sun shaft 3, and sliding associated with the relative movement of the sliding plates 81 and 82. A ball mechanism 83 for reducing the resistance is included. The ball mechanism 83 includes a plurality of balls 83A that are in contact with the first sliding plate 81 and the second sliding plate 82 and perform rolling motion in accordance with the relative movement of the sliding plates 81, 82, and each ball 83A. The retainer 83B is configured to be held between the first sliding plate 81 and the second sliding plate 82. The balls 83A are arranged at equal intervals in the circumferential direction with respect to the center of the third coupling mechanism 8 through the retainer 83B. The retainer 83B is configured as an annular element that can maintain the arrangement of the balls 83A. The first sliding plate 81 is configured as an annular element corresponding to the shape of the ball mechanism 83. Further, it is fixed to the first transmission plate 64 of the first coupling mechanism 6 by press fitting. Further, the center line of itself is provided so as to be aligned with the center line of the first transmission plate 64. The second sliding plate 82 is configured as an annular element in the shape of the ball mechanism 83. Further, it is fixed to the second transmission plate 74 of the second coupling mechanism 7 by press fitting. Further, the center line of itself is provided so as to be aligned with the center line of the second transmission plate 74. The widths of the first sliding plate 81 and the second sliding plate 82 are set so that the ball mechanism 83 can be accurately held within the range of relative movement that occurs between these sliding plates.

With reference to FIG. 18, the assembly aspect of the connection mechanism 56 is demonstrated.
Regarding the structural requirements of the coupling mechanism 56, the condition A is that the first sliding plate 81 is fixed to the first transmission plate 64, and the condition B that the second sliding plate 82 is fixed to the second transmission plate 74. The first connecting shaft 63 and the second transmitting plate are inserted in the state where the first connecting shaft 63 is inserted into the hole 74A of the second transmitting plate 74, that is, relative movement in the radial direction of the sun shaft 3 is allowed. 74 is a condition C. Further, the condition D is that the ball mechanism 83 is disposed between the first sliding plate 81 and the second sliding plate 82 in a state where the conditions A to C are satisfied, and the condition D is satisfied. Condition E is that the first transmission plate 64 is attached to the first connecting shaft 63. Further, the condition F is that the first transmission plate 64 is disposed in the space 72A of the second cylinder 72 in a state in which the condition E is satisfied, and the second transmission plate 74 is in the second cylinder in a state in which the condition F is satisfied. Condition G is that the first coupling mechanism 6 and the second coupling mechanism 7 are combined in a state where the first coupling mechanism 6 and the second coupling mechanism 7 are combined in a state where relative movement in the radial direction of the sun shaft 3 is allowed.

  The coupling mechanism 56 is configured by combining the elements so that the condition G is satisfied. Thereby, when the force which moves the 1st connection mechanism 6 to the radial direction of the sun shaft 3 acted on the 1st connection mechanism 6, the 1st sliding plate 81 of the 1st connection mechanism 6 and the 3rd connection mechanism 8 is the 1st. The two connecting mechanisms 7 move relative to the radial direction of the sun shaft 3. At this time, since the ball mechanism 83 of the third coupling mechanism 8 rolls as the first coupling mechanism 6 moves, the sliding resistance due to the movement of the first coupling mechanism 6 is reduced. As described above, the coupling mechanism 56 can input the thrust load of the spring 54 </ b> A to the sun shaft 3 while allowing relative movement between the spring mechanism 54 and the sun shaft 3 in the radial direction of the sun shaft 3. It is configured.

[8] “Conversion efficiency measurement method”
A procedure for measuring the conversion efficiency H will be described.
(A) The rotation linear motion conversion mechanism 1 is attached to the motion characteristic measuring device 5 through the following procedures 1 to 3. That is, in the procedure 1, the ring shaft 2 is attached to the chuck 53. In the procedure 2, the front end 31 </ b> F of the sun shaft 3 is inserted into the first cylinder 62. The positional relationship between the sun shaft 3 and the first cylinder 62 is set so that the pin 65 can be inserted into the holes 62B and 62C of the first cylinder 62 and the hole 31H of the sun shaft 3. In the procedure 3, the sun shaft 3 is attached to the coupling mechanism 56 by inserting the pin 65 into the holes 62 </ b> B and 62 </ b> C of the first cylinder 62 and the hole 31 </ b> H of the sun shaft 3.

  (B) The conversion efficiency H is measured through the following procedures 4 to 6. That is, in the procedure 4, the ring shaft 2 is rotated through the motor 51 over a specified number of rotations in a state where the rotary linear motion conversion mechanism 1 is attached to the operation characteristic measuring device 5 through the procedures 1 to 3 described above. At this time, the rotation direction of the ring shaft 2 is set so that the sun shaft 3 is displaced toward the back side. Further, the magnitude of the torque inputted from the motor 51 to the ring shaft 2 and the magnitude of the load inputted from the spring 54 </ b> A to the sun shaft 3 are measured while the ring shaft 2 rotates over a specified number of rotations. In step 5, the calculation device 9 calculates the work of the ring shaft 2 based on the torque measured in step 4 and the rotation speed of the ring shaft 2. Further, the work of the sun shaft 3 is calculated based on the load measured through the procedure 4 and the displacement amount of the sun shaft 3. In step 6, the conversion efficiency H is calculated on the basis of the work of the ring shaft 2 and the work of the sun shaft 3 calculated in step 5 in the arithmetic device 9. The displacement amount of the sunshaft 3 is calculated based on the displacement amount of the sunshaft 3 per rotation of the ring shaft 2 that is grasped in advance.

[9] "Relationship between sun shaft and plain bearing"
With reference to FIG.19 and FIG.20, the relationship between the sun shaft 3 and the slide bearing 12 (slide bearing 15) is demonstrated. In FIGS. 19 and 20, the size of the sliding bearing 12 and the clearance C relative to the sun shaft 3 is expressed larger than the actual size.

  As shown in FIG. 19A, in the rotary linear motion conversion mechanism 1, a clearance C is formed between the sun shaft 3 and the slide bearing 12. Here, if it is assumed that the inner peripheral surface of the slide bearing 12 is a perfect circle (a complete circle (one-dot chain line in the figure)), the center line of the sun shaft 3 and the center line of the slide bearing 12 are aligned. The clearance C is constant around the center line. On the other hand, assuming that the inner peripheral surface of the slide bearing 12 is an incomplete circle (solid line in the figure), the center line of the sun shaft 3 and the center line of the slide bearing 12 are aligned. Even at times, the size of the clearance C is not constant around the center line. In the actual rotational linear motion conversion mechanism 1, the outer peripheral surface of the sunshaft 3 is also an incomplete circle in accordance with the inner peripheral surface of the slide bearing 12. As shown, it is assumed that only the inner peripheral surface of the slide bearing 12 is an incomplete circle.

  As shown in FIG. 19B, when the conversion efficiency H is measured, when the attitude of the rotary linear motion conversion mechanism 1 is set to the reference attitude (the attitude of the sunshaft 3 along the horizontal direction), the sunshaft 3 slips. Since it moves so as to fill the clearance C with the bearing 12, the center line of the sun shaft 3 and the center line of the slide bearing 12 are not aligned. In this state, when rotation is input to the ring shaft 2 without the sun shaft 3 being connected to the operating characteristic measuring device, the relationship between the sun shaft 3 and the plain bearing 12 changes as shown in FIG. To do. 20 (A) to 20 (D) show the relationship between the sun shaft 3 and the slide bearing 12 during one rotation of the ring shaft 2 from the state of FIG. Is shown. Moreover, the broken line in a figure has shown the position of the sun shaft 3 in the state of FIG.19 (B).

  Specifically, the force (lateral force) that moves the sun shaft 3 in the radial direction is caused by a portion having a relatively small inner diameter in contact with the sun shaft 3 as the ring shaft 2 rotates. 3, the sun shaft 3 moves in the radial direction with respect to the slide bearing 12. At this time, since the sun shaft 3 is not connected to the operation characteristic measuring device, a force that prevents the lateral movement of the sun shaft 3 in the radial direction is not applied to the sun shaft 3 from the operation characteristic measuring device. Although the sun shaft 3 and the plain bearing 12 are in contact with each other, it is possible to avoid an excessive increase in friction between these elements. On the other hand, when the conversion efficiency H is measured through the basic measurement device described above with the posture of the rotary linear motion conversion mechanism 1 set to the reference posture, one end of the sun shaft 3 is loaded. Since it is connected to the measuring device (corresponding to the spring mechanism 54 of the present embodiment), a force that prevents the sun shaft 3 from moving in the radial direction is generated when a lateral force is applied to the sun shaft 3. Thus, unlike the case described above, the friction between the sun shaft 3 and the slide bearing 12 increases, and the conversion efficiency H cannot be accurately measured due to this friction.

  For this reason, in order to accurately measure the conversion efficiency H, the operation characteristic measuring device 5 is configured so that the movement of the sun shaft 3 in the radial direction due to the contact between the sun shaft 3 and the slide bearing 12 is not hindered. Is considered appropriate. Therefore, in the operation characteristic measuring apparatus 5 of the present embodiment, the coupling mechanism 56 is provided as an element for realizing the behavior of the sun shaft 3. Hereinafter, with reference to FIG. 21 and FIG. 22, an operation mode of the coupling mechanism 56 at the time of measuring the conversion efficiency H will be described. The above description of the relationship between the sun shaft 3 and the slide bearing 12 can be similarly applied even when the inner peripheral surface of the slide bearing 12 and the outer peripheral surface of the sun shaft 3 are incomplete circles. .

  As shown in FIG. 21, when the rotary linear motion conversion mechanism 1 is attached to the operation characteristic measuring device 5, the sun shaft 3 moves downward in the vertical direction with respect to the slide bearing 12, and therefore the center line of the sun shaft 3. Thus, a state in which the center line of the plain bearing 12 is not aligned is obtained. In such a state, when rotation is input to the ring shaft 2 through the motor 51, lateral force is applied to the sun shaft 3 through contact between the sun shaft 3 and the slide bearing 12. In the operation characteristic measuring apparatus 5, since the connection mechanism 56 is configured so that the first connection mechanism 6 can move in the radial direction of the sun shaft 3 with respect to the second connection mechanism 7, FIG. When a lateral force is applied to the sunshaft 3, the sunshaft 3, the first connecting mechanism 6, the pin 65, and the first sliding plate 81 are integrated with each other to the second connecting mechanism 7 and the spring mechanism 54. 3 in the radial direction. That is, the movement of the sun shaft 3 in the radial direction due to the lateral force is prevented from being hindered through the spring mechanism 54. As a result, an increase in friction between the sun shaft 3 and the slide bearing 12 during measurement of the conversion efficiency H is suppressed, so that the conversion efficiency H can be accurately measured. Further, as shown in FIG. 23, it is confirmed that a characteristic curve C showing a tendency substantially the same as the characteristic curve A is obtained as a characteristic curve showing a tendency of change in the torque of the ring shaft 2 with respect to the load of the sunshaft 3. ing.

[Effect of the embodiment]
As described in detail above, according to the operation characteristic measuring apparatus for the rotational linear motion conversion mechanism of the present embodiment, the following effects can be obtained.

  (1) In the operation characteristic measuring apparatus 5 of the present embodiment, the coupling mechanism 56 that connects the sun shaft 3 and the spring mechanism 54 can allow the movement of the sun shaft 3 in the radial direction with respect to the spring mechanism 54. It is configured. As a result, an increase in friction between the sun shaft 3 and at least one of the slide bearing 12 and the slide bearing 15 during measurement of the conversion efficiency H is suppressed, so that the conversion efficiency H can be accurately measured.

  (2) In the operation characteristic measuring apparatus 5 of the present embodiment, the coupling mechanism 56 is configured such that force is transmitted between the first coupling mechanism 6 and the second coupling mechanism 7 via the third coupling mechanism 8. Has been. As a result, the sliding resistance accompanying the relative movement between the first coupling mechanism 6 and the second coupling mechanism 7, that is, the force that hinders the movement of the sun shaft 3 in the radial direction is reduced. It becomes possible to measure accurately.

  (3) In the rotational linear motion conversion mechanism 1, the conversion efficiency H may fall below the reference efficiency (required conversion efficiency H) due to the fact that the elements are not properly combined. Therefore, it is possible to determine whether or not each component is appropriately combined based on the comparison between the measured conversion efficiency H and the reference efficiency. In addition, based on the determination result, for those whose conversion efficiency H is lower than the reference efficiency, the defective assembly in the production of the rotary linear motion conversion mechanism 1 can be reduced by correcting the assembly defect. Become. However, in the case of reducing the rate of defective products through such a method, the determination result of the assembled state based on the comparison between the conversion efficiency H and the reference efficiency is inappropriate, so that the rotation linear motion conversion mechanism 1 There is a concern that it may lead to a reduction in work efficiency in manufacturing. That is, when the conversion efficiency H is measured as a value that is excessively lower than the actual conversion efficiency H, the measured conversion efficiency H is lower than the reference efficiency, so that there is no problem in the assembled state. However, it is determined that the assembly state needs to be corrected. In this case, the rotational linear motion conversion mechanism 1 is unnecessarily disassembled, so that the work efficiency cannot be reduced. In this regard, according to the operation characteristic measuring apparatus 5 of the present embodiment, since the conversion efficiency H can be accurately measured as described above, the rate of defective products in the production of the rotary linear motion conversion mechanism 1 is reduced. This makes it possible to achieve both the reduction of work efficiency and the reduction in work efficiency.

[Modification of the embodiment]
In addition, the said embodiment can also be changed and implemented as shown, for example below.
In the above embodiment, the configuration including the ball mechanism 83 as an element for reducing the friction between the first sliding plate 81 and the second sliding plate 82 is adopted, but means for realizing such an object is a ball. The mechanism 83 is not limited and can be changed as appropriate.

(Other technical ideas)
Examples of other technical ideas related to the operation characteristic measuring device of the rotational linear motion conversion mechanism are shown in the following (A) to (J).

  (A) An annular shaft in which a space is provided, a solar shaft disposed within the annular shaft, a planetary shaft disposed around the solar shaft within the annular shaft, and the annular shaft And a bearing that supports the solar shaft and that the linear motion of the annular shaft is obtained through the planetary motion of the planetary shaft accompanying the rotational motion of the solar shaft. In the operation characteristic measuring device of the rotary linear motion conversion mechanism used for measuring the conversion efficiency of the work, the function of inputting torque to the sun axis and the torque input to the sun axis A first measuring device having a function of measuring the magnitude, a function of inputting a thrust load to the annular shaft, and a function of measuring the magnitude of the thrust load inputted to the annular shaft. With a second measuring device A load mechanism for generating a thrust load, and a connection mechanism for transmitting force between the load mechanism and the annular shaft. A first coupling mechanism connected to the annular shaft and a second coupling mechanism connected to the load mechanism, and the first coupling mechanism and the coupling mechanism. An apparatus for measuring operational characteristics of a rotational linear motion conversion mechanism, wherein the second coupling mechanism is configured to be relatively movable in a radial direction of the annular shaft.

  (B) In the operation characteristic measuring device for the rotational linear motion conversion mechanism according to (A), the connection mechanism is a first for transmitting force between the first connection mechanism and the second connection mechanism. The third connecting mechanism is configured to include a third connecting mechanism, and the third connecting mechanism can reduce sliding resistance caused by relative movement between the first connecting mechanism and the second connecting mechanism. An apparatus for measuring the operational characteristics of a rotating linear motion conversion mechanism, characterized in that it is configured.

  (C) In the operation characteristic measuring apparatus for the rotational linear motion conversion mechanism described in (B) above, the third coupling mechanism is a rolling motion accompanying relative movement of the first coupling mechanism and the second coupling mechanism. An apparatus for measuring the operating characteristics of a rotating linear motion conversion mechanism, characterized in that it is configured to include a sphere that performs the above.

  (D) In the operation characteristic measuring device for a rotational linear motion conversion mechanism according to any one of (A) to (C) above, for the first coupling mechanism, a first coupling body for fastening the annular shaft; A second connection in which a space for arranging the first transmission body is provided in the second connection mechanism, including a first transmission body fixed to one end of the connection body. A body and a second transmission body fixed to the coupling body, and the second transmission body in a state in which relative movement in the radial direction of the annular shaft is allowed. The first connection body and the second transmission body are combined with each other in a state in which relative movement in the radial direction is allowed for the connection mechanism. The condition 1 is satisfied and the condition 1 is satisfied Condition 2 is that the first transmission body is attached to one end of one connection body, and the first transmission body is disposed in the space of the second connection body in a state where the condition 2 is satisfied. Condition 3 is set, and when the condition 3 is satisfied, the second transmission body is fixed to the second connected body, and the condition 4 is satisfied. The components are combined so that the condition 4 is satisfied. A device for measuring the operation characteristics of a rotating linear motion conversion mechanism.

  (E) In the operation characteristic measuring apparatus for a rotational linear motion conversion mechanism according to (D), a first cylinder for disposing one end of the annular shaft for the first coupling body, and the first A first connecting shaft for attaching the first transmission body; a second cylinder for attaching the second transmission body to the second coupling body; and a second connection for connecting the load mechanism. An operating characteristic measuring device for a rotating linear motion conversion mechanism, characterized in that a shaft is provided.

  (F) An annular shaft in which a space is provided, a solar axis disposed in the annular axis, a planetary axis disposed around the solar axis in the annular axis, and the annular axis And a bearing that supports the solar shaft and that the linear motion of the annular shaft is obtained through the planetary motion of the planetary shaft accompanying the rotational motion of the solar shaft. In the operation characteristic measuring device of the rotary linear motion conversion mechanism used for measuring the conversion efficiency of the work, the function of inputting torque to the sun axis and the torque input to the sun axis A first measuring device having a function of measuring the magnitude, a function of inputting a thrust load to the annular shaft, and a function of measuring the magnitude of the thrust load inputted to the annular shaft. With a second measuring device A load mechanism for generating a thrust load, and a connection mechanism for transmitting force between the load mechanism and the annular shaft. When the force that moves the annular shaft in the radial direction in accordance with the contact between the bearing and the solar shaft due to the rotation of the solar shaft is applied to the annular shaft. An apparatus for measuring the operating characteristics of a rotating linear motion conversion mechanism, characterized in that the relative movement between the load mechanism and the annular shaft in the radial direction of the annular shaft can be allowed. .

  (G) In the operating characteristic measuring apparatus for a rotational linear motion conversion mechanism according to any one of (A) to (F), the rotational linear motion conversion mechanism is provided with a female screw on the inner peripheral side of the annular shaft. A male screw provided on the outer peripheral side of the sun shaft, a male screw provided on the outer peripheral side of the planetary shaft, a female screw of the annular shaft, a male screw of the solar shaft, and a male screw of the planetary shaft, An apparatus for measuring the operating characteristics of a rotating linear motion conversion mechanism, characterized in that it is configured on the condition that the two are engaged with each other.

  (H) In the operating characteristic measuring apparatus for a rotational linear motion conversion mechanism described in (G) above, the rotational linear motion conversion mechanism includes a first annular gear and a second annular gear as internal gears on the annular shaft. Providing the first sun gear and the second sun gear as external gears on the sun shaft, providing the first planet gear and the second planet gear as external gears on the planet shaft, The first annular gear, the first sun gear, and the first planetary gear are meshed; and the second annular gear, the second sun gear, and the second planetary gear are meshed. An apparatus for measuring operational characteristics of a rotating linear motion conversion mechanism, characterized in that:

  (I) An annular shaft in which a space is provided, a solar shaft disposed in the annular shaft, a planetary shaft disposed around the solar shaft in the annular shaft, and the annular shaft And a bearing that supports the solar shaft and that the linear motion of the annular shaft is obtained through the planetary motion of the planetary shaft accompanying the rotational motion of the solar shaft. In the method for measuring the operation characteristics of the rotational linear motion conversion mechanism for measuring the work conversion efficiency, the rotational linear motion conversion mechanism according to any one of (A) to (H) above is used. An operation characteristic measurement method for a rotating linear motion conversion mechanism, wherein the operation characteristic is measured through an operation characteristic measurement device.

  (J) In the method for measuring operational characteristics of the rotational linear motion conversion mechanism according to (I) above, through the first measuring device in a state where a thrust load is input to the annular shaft through the second measuring device. The step of rotating the sun shaft over a specified number of revolutions by inputting torque to the sun shaft, and the torque of the first measuring device and the thrust load of the second measuring device measured in the step And a step of calculating a work conversion efficiency of the rotary linear motion conversion mechanism.

The perspective view which shows the perspective structure of a rotation linear motion conversion mechanism about embodiment which actualized the operating characteristic measuring apparatus of the rotation linear motion conversion mechanism of this invention. The perspective view which shows the internal structure about the rotation linear motion conversion mechanism of the embodiment. The top view which shows the planar structure about the ring shaft which comprises the rotation linear motion conversion mechanism of the embodiment. The front view which shows the front structure about the ring shaft which comprises the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-section along a centerline about the ring shaft which comprises the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-section of the state which decomposed | disassembled one part about the ring shaft which comprises the rotation linear motion conversion mechanism of the embodiment. (A) The top view which shows the planar structure about the sun shaft which comprises the rotation linear motion conversion mechanism of the embodiment. (B) Sectional drawing which shows the cross-section along a centerline about the sun shaft. (A) The top view which shows the planar structure about the planetary shaft which comprises the rotation linear motion conversion mechanism of the embodiment. (B) Sectional drawing which shows the cross-section along a centerline about the planetary shaft. Sectional drawing which shows the cross-section along a centerline about the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-sectional structure which follows the DA-DA line | wire of FIG. 9 about the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-sectional structure which follows the DB-DB line | wire of FIG. 9 about the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-sectional structure which follows the DC-DC line | wire of FIG. 9 about the rotation linear motion conversion mechanism of the embodiment. The schematic diagram which shows typically the whole structure about the rotation linear motion conversion mechanism of the embodiment. The top view which shows the planar structure about the connection mechanism which comprises the operating characteristic measuring apparatus of the rotation linear motion conversion mechanism of the embodiment. The front view which shows the front structure about the connection mechanism which comprises the operating characteristic measuring apparatus of the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-sectional structure which follows the DD-DD line | wire of FIG. 15 about the connection mechanism which comprises the operating characteristic measuring apparatus of the rotation linear motion conversion mechanism of the embodiment. The front view which shows the front structure of the state which removed the part about the connection mechanism which comprises the operating characteristic measuring apparatus of the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-section of the state decomposed | disassembled into each component about the connection mechanism which comprises the operating characteristic measuring apparatus of the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the relationship between a sun shaft and a slide bearing about the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the relationship between a sun shaft and a slide bearing about the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-sectional structure of the state by which the sun shaft was connected to the connection mechanism about the operating characteristic measuring apparatus of the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-sectional structure of the state by which the sun shaft was connected to the connection mechanism about the operating characteristic measuring apparatus of the rotation linear motion conversion mechanism of the embodiment. The graph which shows the example about the change tendency of the torque with respect to the load of the rotation linear motion conversion mechanism obtained through the characteristic measuring apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rotary linear motion conversion mechanism, 11 ... Front collar, 11H ... Oil hole, 12 ... Slide bearing, 13 ... O-ring, 14 ... Back collar, 15 ... Slide bearing, 16 ... O-ring, 2 ... Ring shaft, 21 ... Ring shaft main body (annular shaft main body), 21A ... main body screw portion, 21B ... main body gear portion, 21C ... main body gear portion, 22 ... circular ring screw, 23 ... front ring gear, 24 ... rear ring gear, 3 ... sun shaft 31 ... Sun shaft body (solar shaft body), 31A ... Main body screw part, 31B ... Main body gear part, 31C ... Main body gear part, 31F ... Front side end, 31G ... Front side reference hole, 31H ... Hole, 32 ... Sun screw, 33 ... front sun gear, 34 ... back sun gear, 4 ... planetary shaft, 41 ... planetary shaft main body (planetary shaft main body), 41A ... main body screw portion, 41B ... main body gear portion, 41C ... Body gear part, 42 ... Planetary screw, 43 ... Front planetary gear, 44 ... Rear planetary gear, 44H ... Bearing hole, 5 ... Operating characteristic measuring device, 5A ... Torque measuring device, 5B ... Load measuring device, 51 ... Motor, 51A ... Output shaft, 52 ... Torque measuring instrument, 53 ... Chuck, 54 ... Spring mechanism, 54A ... Spring, 55 ... Load measuring instrument, 56 ... Connecting mechanism, 6 ... First connecting mechanism, 61 ... First connecting body, 62 ... First cylinder, 62A ... space, 62B ... hole, 62C ... hole, 63 ... first connecting shaft, 64 ... first transmission plate (first transmission body), 65 ... pin, 65A ... main body, 65B ... flange, 7 ... Second coupling mechanism, 71 ... second coupling body, 72 ... second cylinder, 72A ... space, 73 ... second coupling shaft, 74 ... second transmission plate (second transmission body), 74A ... hole, 75 ... bolt, 8 ... 3rd connection mechanism, 81 ... 1st sliding plate, 82 ... 2 sliding plate, 83 ... ball mechanism, 83A ... ball (sphere), 83B ... retainer, 9 ... arithmetic unit, C ... clearance.

Claims (10)

An annular shaft provided with a space therein, a solar shaft disposed in the annular shaft, a planetary shaft disposed around the solar shaft in the annular shaft, and the annular shaft integrally Provided that a bearing is provided to rotate and support the sun axis, and that the linear movement of the sun axis is obtained through the planetary movement of the planetary axis accompanying the rotational movement of the annular axis. For the rotational linear motion conversion mechanism configured as follows, in the operation characteristic measuring device of the rotational linear motion conversion mechanism used for measuring the conversion efficiency of the work,
A first measuring device provided with a function of inputting torque to the annular shaft and a function of measuring the magnitude of the torque input to the annular shaft; a function of inputting a thrust load to the sun shaft; Including a second measuring device provided with a function of measuring the magnitude of the thrust load input to the sun axis, and a load for generating a thrust load for the second measuring device. A mechanism including a coupling mechanism for transmitting force between the load mechanism and the sun shaft, and a first coupling mechanism connected to the sun shaft for the coupling mechanism; A second coupling mechanism connected to the load mechanism, and the first coupling mechanism and the second coupling mechanism are configured to be relatively movable in a radial direction of the sun axis. Rotating straight line characterized by and Motion characteristic measuring device for motion conversion mechanism. In the operation characteristic measuring device of the rotation linear motion conversion mechanism according to claim 1,
The coupling mechanism includes a third coupling mechanism for transmitting force between the first coupling mechanism and the second coupling mechanism, and the third coupling mechanism includes the first coupling mechanism and the third coupling mechanism. An apparatus for measuring operation characteristics of a rotational linear motion conversion mechanism, characterized in that the sliding resistance associated with relative movement between the first connecting mechanism and the second connecting mechanism can be reduced. In the operation characteristic measuring device of the rotation linear motion conversion mechanism according to claim 2,
The third connecting mechanism includes a spherical body that rolls in accordance with relative movement of the first connecting mechanism and the second connecting mechanism. Operating characteristic measuring device. In the operation characteristic measuring device of the rotation linear motion conversion mechanism according to any one of claims 1 to 3,
The first coupling mechanism includes a first coupling body for fastening the sun shaft, and a first transmission body fixed to one end of the coupling body, and the second coupling mechanism. The connection mechanism includes a second connection body provided with a space for arranging the first transmission body, and a second transmission body fixed to the connection body, and the second transmission body. And a configuration in which the relative movement in the radial direction of the sun axis is allowed to be combined with the first coupling body, and the relative movement in the radial direction with respect to the coupling mechanism. The first transmission body is combined with the second transmission body in a state in which the first transmission body is allowed, and the first transmission body is connected to one end of the first connection body when the first condition is satisfied. Condition 2 is that the body is attached, and Condition 2 is satisfied The condition is that the first transmission body is disposed in the space of the second connection body in the state, and the second transmission body is fixed to the second connection body in a state where the condition 3 is satisfied. The operating characteristic measuring device for a rotating linear motion conversion mechanism, characterized in that the constituent elements are combined so that the condition 4 is satisfied as the condition 4. In the operation characteristic measuring device of the rotation linear motion conversion mechanism according to claim 4,
A first cylinder for disposing one end of the sun shaft and a first connection shaft for attaching the first transmission body; and a second connection body. And a second connecting shaft for attaching the second transmission body and a second connecting shaft for connecting the load mechanism are provided. An annular shaft provided with a space therein, a solar shaft disposed in the annular shaft, a planetary shaft disposed around the solar shaft in the annular shaft, and the annular shaft integrally Provided that a bearing is provided to rotate and support the sun axis, and that the linear movement of the sun axis is obtained through the planetary movement of the planetary axis accompanying the rotational movement of the annular axis. For the rotational linear motion conversion mechanism configured as follows, in the operation characteristic measuring device of the rotational linear motion conversion mechanism used for measuring the conversion efficiency of the work,
A first measuring device provided with a function of inputting torque to the annular shaft and a function of measuring the magnitude of the torque input to the annular shaft; a function of inputting a thrust load to the sun shaft; Including a second measuring device provided with a function of measuring the magnitude of the thrust load input to the sun axis, and a load for generating a thrust load for the second measuring device. A mechanism including a coupling mechanism for transmitting force between the load mechanism and the sun shaft, and the bearing and the sun by rotation of the annular shaft. Allowing a relative movement between the load mechanism and the solar axis in the radial direction of the solar axis when a force that moves the solar axis in the radial direction in contact with the axis acts on the solar axis. Be configured to be able to Operating characteristics measuring apparatus of the conversion mechanism according to claim. In the operation characteristic measuring device of the rotation linear motion conversion mechanism according to any one of claims 1 to 6,
The rotational linear motion conversion mechanism is provided with a female screw on the inner peripheral side of the annular shaft, a male screw on the outer peripheral side of the sun shaft, and a male screw on the outer peripheral side of the planetary shaft. And measuring the operating characteristics of the rotating linear motion conversion mechanism, characterized in that the male screw of the annular shaft and the male screw of the sun shaft and the male screw of the planetary shaft are meshed with each other. apparatus. In the operation characteristic measuring device of the rotation linear motion conversion mechanism according to claim 7,
In the rotating linear motion conversion mechanism, a first annular gear and a second annular gear are provided as inner gears on the annular shaft, and a first sun gear and a second sun gear are provided as outer gears on the sun shaft. The first planetary gear and the second planetary gear are provided as external gears on the planetary shaft; and the first annular gear, the first sun gear, and the first planetary gear are meshed with each other. And the second annular gear, the second sun gear, and the second planetary gear are meshed with each other. measuring device. An annular shaft provided with a space therein, a solar shaft disposed in the annular shaft, a planetary shaft disposed around the solar shaft in the annular shaft, and the annular shaft integrally Provided that a bearing is provided to rotate and support the sun axis, and that the linear movement of the sun axis is obtained through the planetary movement of the planetary axis accompanying the rotational movement of the annular axis. In the method for measuring the operation characteristics of the rotational linear motion conversion mechanism for measuring the conversion efficiency of the work, the rotational linear motion conversion mechanism configured as:
The operation characteristic measurement method of the rotation linear motion conversion mechanism, wherein the operation characteristic is measured through the operation characteristic measurement device of the rotation linear motion conversion mechanism according to any one of claims 1 to 8. In the operation characteristic measuring method of the rotating linear motion conversion mechanism according to claim 9,
By inputting torque to the annular shaft through the first measuring device in a state where a thrust load is inputted to the solar shaft through the second measuring device, the annular shaft is rotated over a predetermined rotational speed. And a step of calculating work conversion efficiency of the rotary linear motion conversion mechanism based on the torque of the first measuring device and the thrust load of the second measuring device measured in the step. A method for measuring the operating characteristics of a rotating linear motion conversion mechanism.

Images