JP7098684B2 - Power transmission device - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention is a power transmission device placed between an input member and an output member, in particular, a power transmission device capable of transmitting and disconnecting power between input / output shafts and further shifting gears between input / output shafts. It is about.

The following Patent Document 1 includes planetary gears as an example of a power transmission device having an input member and an output member having a common central axis and capable of transmitting and disconnecting a speed-shifted power between the input member and the output member. A power transmission device using a mechanism is disclosed. In this power transmission device, the input member is connected to the sun gear and the output member is connected to the carrier. The planetary gears rotatably supported by the carrier mesh with the sun gear and the ring gear, and the ring gear can be switched between a rotatable state and a non-rotatable state by a control means. The control means actuates a spring-urged rolling element by rotating an oval cam so that the rolling element engages or engages in the wedge-shaped space defined between the ring gear and the fixing member. By releasing the bite, the ring gear is switched between a rotatable state and a non-rotatable state. When the ring gear cannot be rotated by the control means, the rotation added to the input member is decelerated and transmitted to the output member, and the rotation added to the output member is accelerated and transmitted to the input member. Will be done. On the other hand, when the ring gear is rotatable by the control means, the input member is the output member when rotation is applied to the input member, and the output member is the input member when rotation is applied to the output member. On the other hand, they slip and are cut off.

The above-mentioned power transmission device is used, for example, as an opening / closing mechanism for electrically opening / closing a shutter arranged at an entrance / exit of a garage or a store. When the power transmission device described above is used for the opening / closing mechanism, the input member is connected to the electric motor and the output member is connected to the shaft that operates the shutter. When the ring gear cannot rotate by the control means, the rotation applied to the input member is decelerated and transmitted to the output member, so that even a small motor is a relatively heavy shutter. Can be opened and closed. On the other hand, since the rotation applied to the output member is accelerated and transmitted to the input member, a large force is required to manually open and close the shutter while the motor drive is stopped. By utilizing this characteristic, the shutter opening / closing position can be held by the power transmission device when the motor drive is stopped. In addition, when it is necessary to manually operate the shutter due to a power failure or the like, the output member spins if the ring gear is made rotatable by operating the control means, so that the shutter can be opened and closed with a small force. ..

Japanese Patent No. 6182245

Therefore, in the above-mentioned power transmission device, when the ring gear cannot be rotated by the control means, the rotation applied to the output member is merely accelerated and transmitted to the input member, and is transmitted to the output member. When a large rotational torque is applied, the rotation applied to the output member may be transmitted to the input member. Therefore, the driven member cannot be held by the load applied to the driven member such as the shutter connected to the output member.

The present invention has been made in view of the above facts, and its main technical problem is to lock the output member by operating the control means so that the rotation applied to the output member is not reliably transmitted to the input member. Is to provide a new power transmission device that can be used.

As a result of diligent studies, the present inventor connects an input member and an output member having a common central axis via an actuating member arranged eccentrically with respect to the common central axis, and the actuating member is provided on the input member. A fitting means that rotatably fits the eccentric body and an operating external gear that meshes with the output internal gear provided on the output member are provided, and the operating member is further provided with a central axis common to the control means. By combining an actuating assisting member that can switch between a rotatable state and a non-rotating state, and in a non-rotating state of the actuating assisting member by a control means, the rotating motion of the actuating member is regulated, but the revolving motion is allowed. It has been found that the above-mentioned main technical problems can be solved by allowing the rotating motion and the revolving motion of the actuating member in a state where the actuating assisting member can be rotated by the control means.

That is, according to the present invention, as a power transmission device capable of solving the above-mentioned main technical problem, it is a power transmission device capable of transmitting and disconnecting gear-shifted power between an input member and an output member. The input member and the output member have a common central axis, and the input member and the output member are connected to each other via an actuating member arranged eccentrically with respect to the common central axis. The output member is provided with an eccentric body, the output member is provided with an output internal gear, and the operating member is provided with a fitting means that rotatably fits the eccentric body and an operation that meshes with the output internal gear. An external gear is provided, and the actuating member is further combined with an actuating assisting member arranged on the common central axis, and the actuating member has an engaging protrusion and the actuating assisting member. Is provided with an engaging concave portion that can be engaged with the engaging convex portion, and the actuating auxiliary member can be switched between a rotatable state and a non-rotatable state around the common central axis by a control means. When the operation assisting member cannot rotate around the common central axis by the control means, the actuating member rotates due to the engagement between the engaging convex portion and the engaging concave portion. Although it is restricted, it is permissible to revolve around the common central axis, and when the control means allows the actuating auxiliary member to rotate around the common central axis, the actuating member Provided is a power transmission device characterized by being allowed to rotate and revolve around the common central axis.

Preferably, the teeth of the output internal gear and the working external gear are both trochoidal. The engaging convex portion is convex in the axial direction, and the engaging concave portion is concave in the axial direction. Preferably, the fitting means is composed of an inner fitting wall and an outer fitting wall, both of which are cylindrical, and the eccentric body is fitted between the inner fitting wall and the outer fitting wall. Is convenient. A bearing may be disposed between the inner fitting wall and the eccentric body. It is preferable that a common shaft member is arranged along the common central shaft. Preferably, the control means includes an acting member provided with an abutting piece capable of contacting the actuating assisting member, and a pressing member acting on the acting member to press the abutting piece against the actuating assisting member. I'm out. In this case, it is preferable that the operation assisting member is formed with a contact recess into which the tip end portion of the contact piece fits. In this case, it is further preferable that the tip end portion of the contact piece has a truncated cone shape and the contact recess has a conical shape. Further, at least the actuation assisting member is housed in a housing, and the housing includes an end plate arranged between the actuation assisting member and the pressing member, and the end plate has an action leading to the actuating assisting member. A hole is provided, and it is preferable that the contact piece of the working member is inserted into the working hole. In this case, a female screw is formed in the pressing member and a male screw is formed in the housing, and the pressing member has the common center by screwing the female screw and the male screw. It is preferable that it can reciprocate along the axis. Further, it is preferable that a wave spring is disposed between the end plate and the working member.

According to the power transmission device of the present invention, when rotation is applied to the input member in a state where the operation assisting member cannot rotate around a common central axis by the control means, the operation assist member is operated by the rotation of the eccentric body of the input member. A common rotational movement around the central axis is added to the members, but since the above-mentioned rotational movement of the operation assisting member is restricted, the rotational movement of the operating member is restricted, and only the revolving motion of the operating member is the operating external tooth. It is transmitted to the output member by the meshing of the gear and the output internal tooth gear. Therefore, the rotation applied to the input member is decelerated and transmitted to the output member. When rotation is added to the output member in the above state, the operating member tries to rotate at a position eccentric with respect to the common central axis due to the engagement between the output internal gear and the operating external gear. As shown above, since the rotation of the operating member is restricted, the output member cannot be locked and rotated, and the rotation applied to the output member is locked by the output member and is not transmitted to the input member. On the other hand, when rotation is applied to the input member in a state where the operation assisting member can rotate around the common central axis by the control means, the rotation of the eccentric body of the input member causes the operation member to rotate around the common central axis. The rotational motion of the input member is added, the operating member rotates and revolves, and the operation assisting member rotates, so that the input member slips with respect to the output member, and the rotation added to the input member is not transmitted to the output member. When rotation is applied to the output member in the above state, the operating member rotates on its axis due to the engagement between the output internal gear and the operating external gear, and the operation assisting member also rotates, and the rotation added to the output member is input. Not transmitted to the member.

Therefore, according to the power transmission device of the present invention, it is possible to lock the rotation of the output member by operating the control means and to prevent the rotation applied to the output member from being reliably transmitted to the input member. ..

The figure which shows the whole structure of the preferable embodiment of the power transmission apparatus configured according to this invention. The figure which shows the input member of the power transmission device shown in FIG. 1 by itself. The figure which shows the output member of the power transmission device shown in FIG. 1 by itself. The figure which shows the operating member of the power transmission device shown in FIG. 1 by itself. The figure which shows the operation assist member of the power transmission device shown in FIG. 1 by itself. The figure which shows the housing body of the power transmission device shown in FIG. 1 by itself. The figure which shows the shield plate of the power transmission device shown in FIG. 1 by itself. The figure which shows the working member of the power transmission device shown in FIG. 1 by itself. FIG. 5 is a diagram for explaining the operation of the power transmission device shown in FIG. 1 when rotation is applied to the input member in a state where the operation assisting member cannot be rotated by the control means. FIG. 5 is a diagram for explaining the operation of the power transmission device shown in FIG. 1 when rotation is applied to the output member in a state where the operation assisting member cannot rotate by the control means. In the power transmission device shown in FIG. 1, a diagram for explaining operation when rotation is applied to an input member in a state where the operation assisting member can be rotated by a control means. In the power transmission device shown in FIG. 1, a diagram for explaining operation when rotation is applied to an output member in a state where the operation assisting member can be rotated by a control means. The figure which shows the whole structure of the modification of the power transmission device configured according to this invention.

Hereinafter, description will be made in more detail with reference to the accompanying drawings illustrating preferred embodiments of the power transmission device configured according to the present invention.

Explaining with reference to FIG. 1, the power transmission device, which is configured according to the present invention and is indicated by the number 2, includes an input member 4 and an output member 6 having a common central axis o1. Here, unless otherwise specified, "one side in the axial direction" and "the other side in the axial direction" in the following description are referred to in the same figure as "one side in the axial direction" with reference to the state shown in the upper vertical section of FIG. The left side and the "other side in the axial direction" refer to the right side in the figure.

Explaining with reference to FIGS. 1 and 2, the input member 4 includes an input shaft 8 concentric with the common central shaft o1. Although the input shaft 8 has a cylindrical shape as a whole, an input connecting portion 10 having a regular hexagonal outer peripheral shape is provided at the other end in the axial direction thereof, and the input member 4 has an input connecting portion 10. It is connected to a drive source such as an electric motor via. The input member 4 is provided with an eccentric body 12 having a circular cross section, which is perpendicular to the common central axis o1 and is arranged eccentrically with respect to the common central axis o1. The central axis of the eccentric body 12 is indicated by o2 as the eccentric axis. In the illustrated embodiment, the eccentric body 12 has an eccentric disk 14 extending radially outward from one end of the input shaft 8 in the axial direction, and a cylindrical eccentricity extending from the outer peripheral edge of the eccentric disk 14 to one side in the axial direction. It is composed of an outer peripheral wall 16.

Explaining with reference to FIGS. 1 and 3, the output member 6 includes an output shaft 18 concentric with the common central shaft o1. The output shaft 18 has a cylindrical shape as a whole, but an output connecting portion 20 having a regular hexagonal outer peripheral shape is provided at one end in the axial direction thereof, and the output member 6 is provided via the output connecting portion 20. It is connected to a driven member such as a shutter. The output member 6 is provided with an output internal gear 22 arranged concentrically with the common central axis o1. In the illustrated embodiment, an output disk 24 extending radially outward is provided at the axial other end of the output shaft 18, and a cylinder extending axially other side is provided at the outer peripheral edge of the output disk 24. An output outer peripheral wall 26 having a shape is provided, and the output inner gear 22 is formed on the inner peripheral surface of the output outer peripheral wall 26. The teeth constituting the output internal gear 22 have a trochoidal tooth profile, and the number of teeth is 5.

As shown in FIG. 1, the above-mentioned input member 4 and output member 6 are connected via an actuating member 28 arranged on the eccentric axis o2 (that is, arranged eccentrically with respect to the common central axis o1). Explaining with reference to FIGS. 1 and 4, the operating member 28 is an operating disk 30 arranged between the eccentric body 12 of the input member 4 and the output internal gear 22 of the output member 6 when viewed in the axial direction. It is equipped with. The working disk 30 is perpendicular to the eccentric axis o2, the eccentric axis o2 passes through the center, and a circular working hole 32 penetrating in the axial direction is formed in the center. The actuating member 28 is provided with a fitting means 34 that fits the eccentric body 12 so as to be relatively rotatable. In the illustrated embodiment, the fitting means 34 surrounds the outer peripheral edge of the working hole 32 on the other side surface of the working disk 30 in the axial direction and extends toward the other side in the axial direction with the cylindrical inner fitting wall 36 and the working. It is composed of a cylindrical outer fitting wall 38 extending toward the other side in the axial direction at the outer peripheral edge portion of the other side surface in the axial direction of the disk 30, and is between the inner fitting wall 36 and the outer fitting wall 38. The eccentric body 12 is fitted. Further in the illustrated embodiment, a bearing 40 is also disposed between the inner fitting wall 36 and the eccentric body 12. A plurality of (7 in the illustrated embodiment) engaging protrusions 42 are formed on the axial end faces of the outer fitting wall 38 at equal angular intervals in the circumferential direction. In the illustrated embodiment, the engaging convex portion 42 is axially convex and has a circular cross section. The operating member 28 is also provided with an operating external gear 44 that meshes with the output internal gear 22. The center of the working external gear 44 is the eccentric shaft o2. In the illustrated embodiment, the working external gear 44 is formed on the outer peripheral surface of the protruding portion 46 that surrounds the outer peripheral edge of the working hole 32 on one side surface of the working disk 30 in the axial direction and projects toward one side in the axial direction. ing. The teeth constituting the working external gear 44 have a trochoidal tooth profile, and the number of teeth is four.

As shown in FIG. 1, the above-mentioned operating member 28 is further combined with an operating assisting member 48 arranged on a common central axis o1. Explaining with reference to FIGS. 1 and 5, in the illustrated embodiment, the operation assisting member 48 has an annular plate shape, and has a common central axis o1 on the radial outer side of the base end portion of the input shaft 8. It is arranged vertically with respect to it. The actuating auxiliary member 48 is formed with an engaging recess 50 that can be engaged with the engaging convex portion 42 formed in the actuating member 28. In the illustrated embodiment, the engaging recesses 50 are circular recesses formed on one side surface of the actuating auxiliary member 48 in the axial direction, and a plurality of engaging recesses 50 are spaced apart at equal angles in the circumferential direction (7 in the illustrated embodiment). Pieces) are provided. On the other hand, on the other side surface of the operation assisting member 48 in the axial direction, four contact recesses 52 into which the tip end portion of the contact piece of the action member, which will be described later enters, are provided at equal angular intervals in the circumferential direction. The contact recess 52 has a conical shape in which the inner diameter decreases from the other side in the axial direction toward one side in the axial direction. Such an operation assisting member 48 can be switched between a rotatable state and a non-rotatable state around a common central axis o1 by a control means described later.

As shown in FIG. 1, in the illustrated embodiment, the input member 4 and the output member 6, and the actuating member 28 and the actuating auxiliary member 48 are housed in the housing 54. The housing 54 is composed of a housing body 56 shown in FIG. 6 and a shield plate 58 shown in FIG. 7. Explaining with reference to FIGS. 1 and 6, the housing main body 56 includes a substantially square one-sided end plate 60 and a cylindrical outer peripheral wall 62 extending from the outer peripheral edge of the one-sided end plate 60 to the other side in the axial direction, and has a shaft. It is a cup shape with the other end open. A circular support hole 64 penetrating in the axial direction is formed in the center of the one-side end plate 60. The output shaft 18 of the output member 6 is inserted through the support hole 64, and the housing body 56 rotatably supports the output shaft 18. Inside the outer peripheral wall 62, space portions 66a to 66d having a circular cross section are arranged in series from one side in the axial direction to the other side in the axial direction on a common central axis o1, and their respective diameters are from one side in the axial direction. It is gradually increased toward the other side in the axial direction. A bearing 67 is arranged in the space portion 66a, and the output shaft 18 of the output member 6 is inserted inside the bearing 67. The output internal gear 22 of the output member 6 is arranged in the space portion 66b. The fitting means 34 of the operating member 28 and the eccentric body 12 of the input member 4 fitted to the fitting means 34 are arranged in the space portion 66c. An operation assisting member 48 is arranged in the space portion 66d. A fixing hole 68 on the main body side extending in the axial direction is formed at a corner of the outer peripheral wall 62.

Continuing the description with reference to FIG. 7, the shield plate 58 is a substantially square shape corresponding to the one-side end plate 60 of the housing body 56, and is arranged at the open axial other-side end of the housing body 56. Block. A shield-side fixing hole 70 is formed at a corner of the shield plate 58 so as to penetrate in the axial direction and communicate with the main body-side fixing hole 68 formed in the housing main body 56. The shield plate 58 is fixed to the housing main body 56 by inserting a fixing tool such as a bolt (not shown) common to the shield side fixing hole 70 and the main body side fixing hole 68. In view of such points, the shield plate 58 in the present embodiment corresponds to the (other side) end plate of the housing 54. Four circular action holes 72 penetrating in the axial direction are formed in the radial intermediate portion of the shield plate 58 at equal angular intervals in the circumferential direction. The action hole 72 will be mentioned later. A circular support hole 74 penetrating in the axial direction is formed in the center of the shield plate 58. The input shaft 8 of the input member 4 is inserted into the support hole 74, and the shield plate 58 rotatably supports the input shaft 8. A cylindrical support wall 76 that surrounds the outer peripheral edge of the support hole 74 and extends toward one side in the axial direction is formed on one side surface of the shield plate 58 in the axial direction. As shown in FIG. 1, a bearing 78 is fitted on the inner peripheral surface of the support wall 76, and an input shaft 8 is inserted inside the bearing 78. On the other hand, the inner peripheral surface of the operation assisting member 48 is fitted to the outer peripheral surface of the support wall 76 so as to be relatively rotatable. Therefore, the support wall 76 supports the input shaft 8 and the operation assisting member 48 so as to be relatively rotatable. A cylindrical support shaft 80 that surrounds the outer peripheral edge of the support hole 74 and extends to the other side in the axial direction is formed on the other side surface of the shield plate 58 in the axial direction, and the support shaft 80 also rotatably supports the input shaft 8. is doing. A male screw 82 is formed on the outer peripheral surface of the support shaft 80.

Here, as described above, the operation assisting member 48 can be switched between a rotatable state and a non-rotatable state around the common central axis o1 by the control means 84 shown in FIG. In the illustrated embodiment, the control means 84 includes an acting member 86 and a pressing member 88, and the acting member 86 is arranged between the shield plate 58 and the pressing member 88. In the illustrated embodiment, a wave spring 90 is also disposed between the shield plate 58 and the working member 86 (see FIGS. 11 and 12). Explaining with reference to FIGS. 1 and 8, the working member 86 is an annular thin plate, and abutting pieces 92 protruding in the axial direction are spaced at equal angles in the circumferential direction on one side surface in the axial direction. Four are provided. The tip of the abutting piece 92 is shaped like a truncated cone. The working member 86 is fitted to the outer periphery of the support shaft 80 of the shield plate 58, and the contact piece 92 is inserted into the working hole 72 of the shield plate 58 and can be brought into contact with the operation assisting member 48. The pressing member 88 has a plate shape having a female screw 94 screwed with a male screw 82 formed on the outer peripheral surface of the support shaft 80 of the shield plate 58, and is common by screwing the female screw 94 and the male screw 82. It can reciprocate along the central axis o of. From this, if the pressing member 88 is moved in a direction approaching the acting member 86 (that is, toward one side in the axial direction), the pressing member 88 abuts on the acting member 86 and the contact piece 92 is moved to the actuating auxiliary member 48. Can be pressed against. On the other hand, if the pressing member 88 is moved in a direction away from the acting member 86 (that is, toward the other side in the axial direction), the pressing is released.

In the illustrated embodiment, a common shaft member 96 having a circular cross section is inserted along the common central shaft o1. The common shaft member 96 passes through the inside of the input shaft 8 of the input member 4, then passes through the working hole 32 of the working member 28, and then passes inside the output shaft 18 of the output member 6. Due to the presence of the common shaft member 96, when the input member 4 and the output member 6 rotate as described later, the misalignment of each constituent member is prevented, and the entire device is stably operated.

Subsequently, the operation of the power transmission device of the present invention will be described with reference to FIGS. 9 to 12.
First, the pressing member 88 is moved on the support shaft 80 of the shield plate 58 in a direction approaching the acting member 86 (that is, toward one side in the axial direction), and the pressing member 88 presses the acting member 86 and abuts. A state in which the axial end face of the piece 92 is pressed against the actuating assisting member 48 so that the actuating assisting member 48 cannot rotate around the common central axis o1 by the control means 84 will be described with reference to FIGS. 9 and 10. do. In such a state, the operating member 28 provided with the engaging convex portion 42 that engages with the engaging concave portion 50 of the operating auxiliary member 48 cannot rotate around the common central axis o1. In the illustrated embodiment, the abutting piece 92 of the working member 86 is fitted into the abutting recess 52 of the actuating assisting member 48, and the actuating assisting member 48 is reliably non-rotatable. In this state, when the input member 4 rotates clockwise as shown in FIG. 9 (viewed from the right side of the upper vertical cross section in the same figure; the same applies hereinafter), the eccentric body is shown in the BB cross section in the lower part of the figure. 12 rotates eccentrically around the common central axis o1. That is, the eccentric body 12 rotates while the eccentric axis o2, which is the center thereof, moves (revolves) clockwise around the common central axis o1 (in FIGS. 9 to 12, the arrow having a relatively small curvature rotates. The arrows with relatively large curvatures indicate the revolutions). Since the fitting means 34 of the operating member 28 is fitted to the eccentric body 12 so as to be relatively rotatable, the operating member 28 revolves around the common central axis o1 by the rotation of the eccentric body 12. In other words, the rotation of the eccentric body 12 is canceled. At this time, as shown in the lower section AA in the figure, the engaging convex portion 42 of the operating member 28 makes a circular motion clockwise along the inner peripheral surface of the engaging concave portion 50 of the operating auxiliary member 48. Then, the revolution of the operating member 28 is transmitted to the output member 6 by meshing between the operating external gear 44 and the output internal gear 22 as shown in the lower CC cross section of the figure. At this time, as described above, since the rotational movement of the eccentric body 12 is canceled and only the revolution movement is transmitted, the rotation of the input member 4 is decelerated and transmitted to the output member 6.

On the other hand, as shown in FIG. 10, when the output member 6 tries to rotate clockwise while the operation assisting member 48 cannot rotate around the common central axis o1, it is shown in the lower CC cross section of the same figure. As shown, the output internal gear 22 tries to rotate clockwise around the eccentric shaft o2 by meshing with the operating external gear 44 of the operating member 28. However, since the rotation of the operating member 28 is restricted, the output member 6 is locked and cannot rotate (rotate). In the figure, the arrow shown by the broken line indicates that it does not actually rotate.

Next, the pressing member 88 is moved on the support shaft 80 of the shield plate 58 in a direction away from the working member 86 (that is, toward the other side in the axial direction), and the axial end surface of the contact piece 92 is an operation assisting member. A state in which the operation assisting member 48 can rotate around the common central axis o1 separated from the 48 will be described with reference to FIGS. 11 and 12. In such a state, the operating member 28 can rotate around the common central axis o1 by engaging the engaging concave portion 50 and the engaging convex portion 42. In the illustrated embodiment, since the wave spring 90 is disposed between the shield plate 58 and the working member 86, when the pressing member 88 is moved in the direction away from the working member 86, the contact piece 92 Is easily separated from the operation assisting member 48. In this state, when the input member 4 rotates clockwise as shown in FIG. 11, the eccentric body 12 rotates (rotates and revolves) around the common central axis o1 as shown in the BB cross section in the lower part of the figure. The actuating member 28 revolves clockwise around a common central axis o1. Here, when the output member 6 is held by the load of the driven member connected to the output member 6, the operating member 28 revolves clockwise around the central axis o1 and is shown in the lower CC cross section of the figure. As shown, it rotates counterclockwise due to the engagement between the held output internal gear 22 and the working external gear 44. At this time, the operation assisting member 48 rotates counterclockwise due to the engagement between the engaging convex portion 42 and the engaging concave portion 50 (cross section AA in the figure). Therefore, the rotation added to the input member 4 slips and is cut off.

On the other hand, as shown in FIG. 12, when the output member 6 rotates clockwise while the operation assisting member 48 is rotatable around the common central axis o1, the output internal teeth are shown in the lower CC cross section of the same figure. The gear 22 tries to rotate clockwise around the eccentric shaft o2 by meshing with the working external gear 44 of the operating member 28. At this time, since the actuating assisting member 48 is rotatable (rotatable) around the common central axis o1, when the actuating member 28 rotates around the common central axis o1, the actuating assisting member 48 rotates. It is not regulated. Therefore, the actuating member 28 rotates about the eccentric shaft o2, and the actuating auxiliary member 48 rotates about the common central shaft o1 due to the engagement between the engaging convex portion 42 and the engaging concave portion 50. At this time, as shown in the lower BB cross section of the figure, the fitting means 34 only rotates around the eccentric body 12, and no rotation is added to the eccentric body 12. That is, the rotation added to the output member 6 slips and is cut off.

The case where the input member 4 and the output member 6 rotate in the clockwise direction has been described, but when the input member 4 and the output member 6 rotate in the counterclockwise direction, each component and its portion are opposite to the case where the input member 4 and the output member 6 rotate in the clockwise direction. Since the operation is the same only in the direction, detailed description thereof will be omitted.

Therefore, according to the power transmission device of the present invention, by operating the control means 84, the rotation added to the input member 4 is decelerated and transmitted to the output member 6, but the rotation added to the output member 6 is transmitted. When the output member 6 is locked and is not transmitted to the input member 4, the input member 4 inputs the rotation added to the input member 4 to the output member 6, and the output member 6 inputs the rotation added to the output member 6. It is possible to switch to a state in which each member 4 slips and is cut off.

Further, in the illustrated embodiment, since the teeth of the output internal gear 22 and the working external gear 44 both have a trochoidal tooth profile, the module of each tooth can be enlarged, and the input member 4 to the output member 6 can be enlarged. A large rotational torque can be transmitted to. Further, the control means 84 includes an working member 86 provided with a contact piece 92 capable of contacting the operation assisting member 48, and a pressing member 88 acting on the working member 86 to press the contact piece 92 against the operation assisting member 48. Includes. A female screw 94 is formed on the pressing member 88, and a male screw 82 is formed on the support shaft 80 of the housing 54 (shield plate 58). The pressing member 88 has the female screw 94 and the male screw 82. It is possible to reciprocate along the common central axis o1 by screwing. Therefore, by rotating the pressing member 88 with respect to the support shaft 80 of the housing 54 (shield plate 58), the pressing member 88 moves in the axial direction and comes into contact with the acting member 86, and presses the pressing member 86 in the axial direction or the acting member 86. The above-mentioned pressing can be released by separating from the above. Therefore, even when a relatively large torque is applied to the input member 4 or the output member 6, the control means 84 can be operated with a relatively light force. On the other hand, when the control means utilizes the biting of the rolling element as in Patent Document 1, when a relatively large torque is applied to the input member or the output member, the rolling element strongly bites. A large force is required to squeeze and release such biting, and the operability of the control means is not preferable. Further, since the tip of the contact piece 92 has a truncated cone shape and the contact recess 52 has a conical shape, the tip of the contact piece 92 can be easily fitted into the contact recess 52. Therefore, the control means 84 can be operated even when the input member 4 and / or the output member 6 is rotating.

FIG. 13 shows a modified example of the power transmission device configured according to the present invention. The embodiment shown in FIG. 13 and the embodiment shown in FIG. 1 differ only in the configuration of the engaging convex portion provided on the operating member and the engaging concave portion provided on the operating auxiliary member, and the other configurations are the same. Therefore, in the following description, the same configuration will be assigned the same number and detailed description thereof will be omitted. In this modification, a cylindrical extending wall 41'that extends in the axial direction is formed on the outer peripheral edge of the axial end surface of the outer fitting wall 38'. The engaging convex portion 42'is formed on the inner peripheral surface of the extending wall 41'and has a convex shape in the radial direction, and its cross section has an arc shape. On the other hand, the engaging recess 50'is formed on the outer peripheral surface of the operation assisting member 48'and has a concave shape in the radial direction, and its cross section has an arc shape. The curvature of the cross section of the engaging protrusion 42'is larger than the curvature of the cross section of the engaging recess 50'. Even if the engaging convex portion and the engaging concave portion are made as in this modification, the same effect as that of the embodiment shown in FIG. 1 can be obtained.

Although the power transmission device configured according to the present invention has been described in detail with reference to the attached drawings, the present invention is not limited to the above-described embodiment, and appropriate modifications are made without departing from the present invention. And can be changed. For example, in the illustrated embodiment, the fitting means 34 is composed of an inner fitting wall 36 and an outer fitting wall 38, both of which are cylindrical, and the eccentric body 12 includes the inner fitting wall 36 and the outer fitting wall 38. However, the inner fitting wall 36 may be omitted so that the disc-shaped eccentric body is arranged inside the cylindrical fitting means. Further, the fitting means 34 does not necessarily have to be provided with a cylindrical outer fitting wall 38, and for example, the fitting means is provided by a plurality of cylindrical fitting pillar members arranged at intervals in the circumferential direction. It may be configured so that the eccentric body is fitted so as to be relatively rotatable inside the plurality of cylindrical fitting pillar members. Similarly, the eccentric body does not necessarily have to have a circular cross section, and may be composed of a plurality of columnar column members arranged at intervals in the circumferential direction. As for the control means, in the illustrated embodiment, the pressing means controls the rotation of the operation assisting member by screwing, but the pressing means assists the operation by a well-known clutch that can be engaged and disconnected regardless of the screwing. The rotation of the member may be controlled. Further, in the illustrated embodiment, the action hole 72 leading to the operation assisting member 48 is provided in the shield plate 58, but the action hole may be provided in one side end plate of the housing body.

2: Power transmission device 4: Input member 6: Output member 12: Eccentric body 22: Output internal tooth gear 28: Actuating member 34: Fitting means 42: Engagement convex portion 44: Acting external tooth gear 48: Actuating auxiliary member 50 : Engagement recess 84: Control means

Claims (12)

A power transmission device capable of transmitting and disconnecting speed-shifted power between an input member and an output member.
The input member and the output member have a common central axis, and the input member and the output member are connected via an actuating member arranged eccentrically with respect to the common central axis.
The input member is provided with an eccentric body, the output member is provided with an output internal gear, and the operating member is provided with a fitting means for fitting the eccentric body so as to be relatively rotatable, and the output internal gear. There is an operating external tooth gear that meshes with
The actuating member is further combined with an actuating assisting member arranged on the common central axis, the actuating member engages with the engaging convex portion, and the actuating assisting member engages with the engaging convex portion. Each of the engaging recesses is provided, and the actuating assisting member can be switched between a rotatable state and a non-rotating state around the common central axis by a control means.
When the actuating auxiliary member cannot rotate around the common central axis by the control means, the actuating member may rotate due to the engagement between the engaging protrusion and the engaging recess. Although regulated, it is permissible to revolve around the common central axis,
When the actuating auxiliary member is rotatable around the common central axis by the control means, the actuating member is allowed to rotate or revolve around the common central axis. A power transmission device characterized by that. The power transmission device according to claim 1, wherein the teeth of the output internal gear and the working external gear both have a trochoidal tooth profile. The power transmission device according to claim 1 or 2, wherein the engaging convex portion is convex in the axial direction and the engaging concave portion is concave in the axial direction. The fitting means is composed of an inner fitting wall and an outer fitting wall, both of which are cylindrical, and the eccentric body is fitted between the inner fitting wall and the outer fitting wall. The power transmission device according to any one of 3 to 3. The power transmission device according to claim 4, wherein a bearing is disposed between the inner fitting wall and the eccentric body. The power transmission device according to any one of claims 1 to 5, wherein a common shaft member is arranged along the common central shaft. The control means includes an acting member provided with an abutting piece capable of contacting the actuating assisting member, and a pressing member acting on the acting member to press the abutting piece against the actuating assisting member. The power transmission device according to any one of claims 1 to 6. The power transmission device according to claim 7, wherein the operation assisting member is formed with a contact recess into which the tip end portion of the contact piece is fitted. The power transmission device according to claim 8, wherein the tip portion of the contact piece has a truncated cone shape and the contact recess has a conical shape. At least the actuation assisting member is housed in a housing, the housing comprising an end plate disposed between the actuation assisting member and the pressing member, the end plate having an action hole leading to the actuating assisting member. The power transmission device according to any one of claims 7 to 9, wherein the contact piece of the working member is inserted into the working hole. A female screw is formed in the pressing member and a male screw is formed in the housing, and the pressing member reciprocates along the common central axis by screwing the female screw and the male screw. The power transmission device according to claim 10, which is movable. The power transmission device according to claim 10 or 11, wherein a wave spring is disposed between the end plate and the working member.

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