JPS6339387B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for controlling the output torque of a power rotating body by the amount of expansion of strain in a rotating reaction force generating metal fitting.

An example of a conventional output torque control method that utilizes the amount of distortion in a metal fitting for generating a rotational reaction force of a power rotating body is as shown in FIG. The amount of strain for a minute length proportional to the torsional stress of the torsional deformation part 4 of the metal fitting 2 generated through the protruding part 3 of the generating metal fitting 2 is set to 45 on the outer periphery of the torsional deformation part 4 with respect to the axis 25. It is detected as the amount of electricity passing through the resistance wire strain gauge 5 attached at the same time, and the amount of electricity, which is proportional to the output torque through the rotational reaction force of the power wrench, is compared with the planned amount set in advance by the comparison calculation circuit 6. , the signal at the time when the planned amount is reached is amplified by the amplifier 7 and sent to the electric contact switch 8, and the switch 8 sends the electric power from the power supply 9 to the electric motor 10 to the electric power wrench 1. The output torque was controlled by cutting off the input. Note that 10'' in FIG. 1 is the output shaft of the electric motor 10 and also the input shaft of the reducer 26. 11 is the bearing case, 12 is the reducer case, 2
3 is a power cable, 24 is a signal cable, 25 is a wrench axis, 26 is a reducer, 27 is a wrench output shaft, 28 is a bearing, 29 is a nut turning box, 31 and 33 are bolt sets. , 32 is a nut of the bolt set 31, and 34 is an object to be tightened.

However, in the conventional method for controlling the output torque of a power rotating body, since the slight amount of strain in a very small portion of the rotational reaction force generating fitting 2 is detected with respect to the minute length of the resistance wire strain gauge 5, the amount of distortion due to the temperature of the fitting 2 is detected. It is easily affected by expansion and contraction, and requires special electronic equipment such as a temperature guarantee circuit, making it economically expensive, unstable in accuracy, and complicated and inconvenient to handle at the work site. It was hot. In order to solve the above-mentioned drawbacks, the present invention has one end connected to a torsional movement system that is in a relative rotational motion relationship with the output shaft of a rotating body through a gear mechanism but does not rotate, and the other end is connected to a torsional movement system that does not rotate. Torsional stress or bending stress with respect to the radius of rotation is generated in a rotating reaction force generating metal fitting that is locked or fastened to a fixed structure or a fixed system of a rotating body fixed to the structure, and the rotation caused by each of the above-mentioned stresses is generated. The amount of angular movement with respect to an arbitrary radius consisting of either or both of the amount of twist and the amount of deflection due to bending for each arbitrary length in the axis or rotation radius direction of the reaction force generating metal fitting, or the amount of angular movement is determined by mechanical means. When any one of the expanded travel amounts reaches the planned amount, the position limit switch is activated to transmit an electric signal, and the electric signal is used to transmit electricity or fluid to the rotating body. A method and apparatus for controlling the output torque of a power rotating body that cuts off input for driving by mechanical means.

This is the power wrench shown in Figure 2 and the power wrench shown in Figure 2.
To explain with reference to Fig. 3, which is a cross-sectional view of AA,
The same symbols as in Fig. 1 indicate the same parts.
Reference numeral 2' denotes a rotating reaction force generating metal fitting, one end (a portion) of which is fixed to the reducer case 12 of the casing system in a relative rotational relationship with the output shaft 27 of the power wrench, and its torsionally deformed portion 4' 1 is different from 4 in FIG. 1, it is configured to be long in the direction of the axis 25 of the output shaft 27 so as to include the bearing case 10 in FIG. Consideration has been given to increasing the amount of relative angular movement. 3' is fixed to the tip (portion b) of the torsionally deformed portion 4' of the rotating reaction force generating metal fitting 2', and is connected to the axis 25 of the output shaft 27.
a protrusion that protrudes in the direction of the rotation radius with the center line at
Reference numeral 13 denotes a protrusion provided near the tip (b part) of the torsionally deformable part 4' (hereinafter referred to as the fixing system of the rotating body), which is connected to the output shaft 27 of the wrench and the reducer 26.
It is fixed to the reducer case 12 which is in a relative rotational motion relationship through a gear mechanism but does not rotate, and furthermore, depending on the amount of twist of the torsionally deformed portion 4' of the rotational reaction force generating metal fitting 2', (hereinafter referred to as the torsional movement system of a rotating body)
One end 16' of a lever 16, which is rotatably supported by a fulcrum pin 15 in a direction perpendicular to the plane of the paper, is pressed onto the pedestal 14 in a direction perpendicular to the plane of the paper. Reference numeral 17 is a male screw screwed onto the other end 16'' of the lever 16, and the tip 18 (third
It is constructed so as to press the moving part 21 of the position limit switch 20 fixed on the pedestal 14 as shown in FIG. 19 is a locking nut for the bolt 17;
22 is a signal wire connecting the position limit switch 20 and the electric contact switch or fluid direction switching valve 8';
23' is a power wire or pipe for sending electricity or fluid from the power source or fluid pressure pump 9' to the electric motor or fluid pressure motor 10' via the switch or switching valve 8'. 26 is a reducer, 27
is a main shaft (output shaft) directly connected to the output side of the reduction gear 26, and is rotatably held by the rotational reaction force generating metal fitting 2' via a bearing 28. Reference numeral 29 denotes a nut turning box that fits into the nut 32 of the bolt set 31 to be tightened, and is fixed to the tip of the output shaft 27 and rotatably held by the rotational reaction force generating metal fitting 2' via a bearing 30. ing. 3
Reference numeral 3 denotes a bolt set for locking the protruding portion 3' of the rotational reaction force generating metal fitting 2', and is a part of a fixed structure other than the rotating body that has been tightened and fixed to the body 34 to be tightened in advance. be.

Next, the operation of the output torque control device for a power rotating body shown in FIGS. 2 and 3 will be explained. First, adjust the tip end 1 of the male screw 17 according to the planned value of the required output torque.
8 from the lever 16, and then tighten the box 29 with the nut 32 of the bolt set 31.
, and pull the trigger (not shown) of the power wrench 1. Then, the output shaft 27 and box 29
The reducer case 12, the rotating reaction force generating metal fitting 2', and the cradle 14, which are a motion system (2) (torsional movement system) different from the above, rotate together in the opposite direction to the rotation direction of the output shaft 27, The rotation is continued until the protrusion 3' of the metal fitting 2' is engaged with the bolt set 33. Once the rotation of the protrusion 3' is stopped, the output shaft 27 and the motion system (rotation system) of the box 29 begin to rotate together, and the nut 32 of the bolt set 31 is tightened. At this time, the output torque of the movement system ( ) and the reaction torque of the movement system ( ) always maintain the same value from the time when tightening of the nut 32 starts until the time when the tightening ends. As the tightening force of the nut 32 increases, the reaction force that the protrusion 3' of the rotational reaction force generating metal fitting 2' receives from the bolt set 33 also increases, and therefore the torsional deformation part 4' of the metal fitting 2' increases. The reaction force generates torsional stress, and at the same time, the amount of torsion accumulated (hereinafter referred to as the amount of torsion) for a given length in the axis 25 direction of the rotating body due to torsional strain is generated.
Then, due to the amount of twist described above, the pedestal 14 fixed to one end (part a) of the rotational reaction force generating metal fitting 2' is slightly torsionally moved in the direction opposite to the rotation of the output shaft 27, and one end 16' of the lever 16 is moved. The lever 16 is rotated by pressing the protrusion 13 provided at the other end (portion b) of the metal fitting 2'. Since the lever 16 is configured to move in an arc with the pin 15 as a fulcrum,
As shown in FIG. 3, the amount of rotation of the other end 16'' of the lever 16 is larger than the amount of rotation of one end 16' of the lever by the ratio of the distance L to the distance L between the supporting points, male screw 17 screwed into
It can also be expanded and moved. By the enlarged movement of the male screw 17 on the rotation system of the lever, the tip 18 of the male screw 17 presses and moves the moving part 21 of the position limit switch 20 fixed on the pedestal 14 of the non-rotation system. A slight movement of the moving part 21 opens or closes an electric contact (not shown) in the switch 20, and an electric signal is sent through the electric wire 22 to the electric contact switch or flow direction switching valve 8'. When the switch or switching valve 8' opens or closes in response to an electric signal, power electricity or fluid sent from the power supply or fluid pressure pump 9' to the electric motor or fluid pressure motor 10' is transferred to the electric wire or pipe 23'. It was cut off on the way and power wrench 1
The rotation of the bolt set 31 is stopped and the tightening of the bolt set 31 is completed.

Figure 4 and Figure 5, which is a cross-sectional view of BB in Figure 4.
The figure shows another example of the output torque control device for a power rotating body according to the present invention, and the same reference numerals as in FIGS. 1, 2, and 3 indicate the same parts. Where a gear mechanism is used as a means to expand the amount of minute angular movement due to the amount of accumulated distortion in the metal fittings,
Furthermore, as a method for obtaining the angular movement amount of the rotational reaction force generating metal fitting, the amount of deflection due to bending of the metal fitting is also used, etc. in the output torque control of the power rotating body shown in FIGS. 2 and 3. Different from equipment. Reference numeral 35 denotes a protrusion provided at an arbitrary radius position of the bending deformation part 3'' of the rotational reaction force generating metal fitting 2'' by bending, and the teeth at one end of the protrusion 35 correspond to the torsional deformation part 4 of the rotational reaction force generating metal fitting 2''. The cradle 14 moves angularly along with part a of the metal fitting in accordance with the amount of deformation consisting of both the amount of twisting of `` and the amount of deflection due to bending of the flexure-deforming portion 3'' (hereinafter referred to as the angular movement system of the rotating body). It meshes with a gear 36 in a gear train that is rotatably held. The gear 36 meshes with a gear 37 having fewer teeth than the gear 37.
rotates together with a gear 38 having more teeth than this. Gear 38 is gear 3 with fewer teeth than this.
It meshes with 9. 40, 41, and 42 are rotation axes of the gears 36, 37, 38, and 39, respectively. Reference numeral 43 denotes an arm fixed to the outer periphery of the gear 39 and rotating together with it, and a bolt 17 at the other end.
are screwed together.

Next, the operation of the power wrench output torque control device shown in FIGS. 4 and 5 will be explained. The bending deformation part 3'' of the rotating reaction force generating metal fitting 2'' receives a tightening reaction force from the bolt set 33 at its locking part, and due to this reaction force, the bending deformation part 3'' generates bending stress and at the same time Accompanied by the amount of accumulated deflection (hereinafter referred to as the amount of deflection) for any length in the rotational radial direction due to bending strain.
The torsionally deformed portion 4' of the rotational reaction force generating metal fitting 2'' generates a twist amount due to the reaction force as in the case of the output torque control device for a power rotating body shown in FIGS. 2 and 3. The pedestal 14 fixed at one end (a part) of the 2'' rotates the output shaft 27 by a minute angular movement which is the sum of the amount of deflection of the bending deformation section 3'' and the amount of twisting of the torsional deformation section 4'. The gear 36 is angularly moved in the opposite direction (direction of arrow C), and the teeth of the gear 36 press the teeth of the protrusion 35 fixed at an arbitrary radial position of the bending deformation section 3'', thereby rotating the gear 36.

The minute rotation of the gear 36 is caused by each gear 37, 38,
39, but at this time, in each combination of gear 36 to gear 37 and gear 38 to gear 39,
The amount of movement due to the minute rotation is expanded by the ratio of the number of teeth of each gear. The amount of expanded movement is further expanded by the length ratio of the arm 43 which is fixed to the gear 39 and rotates together, and the bolt 17 screwed onto the other end of the arm 43 is expanded in the direction of arrow D. let If the bolt 17 mentioned above moves in an enlarged manner,
The tip 18 of the bolt 17 operates the moving part 21 of the position limit switch 20, and inputs the input to the power wrench 1 in the same way as in the case of the output torque control device for the power rotating body shown in FIGS. 2 and 3. cut off.

FIG. 6 shows another example of the output torque control device for a power rotating body according to FIG. 2 of the present invention, and the same reference numerals as in FIGS. 2 and 3 indicate the same parts, and The fixing system is always fixed to a fixed structure other than the rotating body, but the fixing system of the hand-held rotating body of the power wrench shown in Fig. 2 is connected to the fixed structure other than the rotating body only when tightening the bolt set. This is different from an output torque control device that stops the output torque.

A bracket 44 connects and fixes the end (portion b) of the rotating reaction force generating metal fitting 2', which is a fixing system for the rotating body, to a fixed structure 34 other than the rotating body.

The operation of the output torque control device for the power rotating body shown in FIG. 6 is the same as that for the power rotating body shown in FIGS. 2 and 3. FIG. 7 shows another example of the output torque control device for a power rotating body according to FIG. 6 of the present invention, and FIG.
The same reference numerals as in the figure indicate the same parts, and the protrusion 13 of the rotating reaction force generating metal fitting 2 is provided on the torsional movement system of the rotating body (section a in the figure), and the pedestal 14 is provided on the fixing system of the rotating body. (part b in the figure), and the part where the protrusion 13 is projected parallel to the axis 25 of the rotating body are the power wrench shown in Fig. 2 or the power wrench shown in Fig. 6. This is different from an output torque control device for a rotating body.

The operation of the output torque control device for the power rotating body shown in FIG. 7 is almost the same as that for the power rotating body shown in FIGS. 2 and 3.
In the output torque control device shown in the figure, one end 16' of the lever 16 disposed on the pedestal 14 fixed to the rotating reaction force generating metal fitting 2' moves torsionally and presses the protrusion 13 of the fixed system. However, in the output torque control device shown in FIG. 7, the torsional angle movement is the opposite, that is, the protrusion 13 provided at the end (portion a) of the rotational reaction force generating metal fitting 2 moves torsionally, and the other end of the metal fitting 2 (b
By pressing one end 16' of a lever 16, which is rotatably held on a pedestal 14 fixed to a holder 14, the lever 16 is rotated and the rotational reaction force generating metal fitting 2 is rotated.
This is different from the operation of the power wrench shown in FIG. 2 or the output torque control device for a power rotary body shown in FIG. 6 in that the amount of movement of the torsion is increased.

Although the above explanation has been made regarding the case where electricity or fluid is used as the power source of the rotating body, the present invention is not limited to this, and the present invention is not limited to this, but can be applied to the fixed value type power rotating body shown in FIGS. 6 and 7. Alternatively, the effect of the present invention is the same even if 9' is used as another rotational drive source, 8' is a clutch mechanism, and 10' is a power transmission device (for example, a gear or a belt, etc.). It becomes a system line that shows transmission.

Furthermore, the above explanation applies to the case where the amount of twist of the rotating reaction force generating metal fitting or the amount of angular movement consisting of both the amount of twist and the amount of deflection due to bending is used as the amount of movement for operating the position limit switch 20. As described above, the present invention has the same effect even when only the amount of deflection due to bending of the metal fitting is used, and furthermore, the above explanation is based on the use of mechanical means to reduce the minute angular movement of the metal fitting for generating rotational reaction force. Although the explanation has been made regarding the case where the rotation amount is used as an enlarged movement amount, the present invention is not limited to this, and as shown in FIG. A position limit switch 20, which is fixed to the other end of the metal fitting and fixed directly on the pedestal 14 which is the angular movement system of the rotating body, is pressed against the male screw 17 arranged on the protrusion 13 to generate a rotational reaction force. The effect of the present invention is the same even if the switch is operated while the metal fitting remains in a small angular movement amount.

Furthermore, the above description is based on the position limit switch 20.
In the combination of the mounting positions on each movement system related to the relative movement of the male screw 17 that presses this, the fixing system of the rotating body with respect to the angular movement system of the rotating reaction force generating metal fitting, and the lever or gear train. When applying a mechanical enlarging device such as, the combination of each movement system such as a rotating system such as the lever 16 and a non-rotating system such as the cradle 14 is free and is limited to the above explanation. However, the effects of the present invention are the same regardless of the combination.

The present invention is capable of moving a small angular movement consisting of the amount of torsion or deflection due to torsional stress or bending stress generated in a rotational reaction force generating metal fitting that is proportional to the output torque of the output shaft of a power rotating body in a circular arc around a fulcrum pin. It is converted into an expanded movement amount by mechanical means such as the ratio of the distance between the fulcrums of the moving lever or the ratio of the number of teeth of the rotary gear, and the power rotation is performed by directly opening and closing the input to the power rotating body at the expanded movement amount. Since the output torque of the body is controlled, the output torque is stabilized with high precision, and the device is simple and economically advantageous, and it is easy to handle at the work site.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of a conventional power wrench output torque control method, FIG. 2 is a cross-sectional view showing an embodiment of a power rotating body output torque control method of the present invention, and FIG. The figures are a cross-sectional view taken along the line A-A in FIG. 2, a cross-sectional view showing another embodiment of the present invention, and FIG.
FIG. 6 is a cross-sectional view showing another embodiment of the output torque control device for a power rotating body according to FIG. 2 of the present invention, and FIG. 7 is an output torque control for a power rotating body according to FIG. 6 of the present invention. FIG. 8 is a cross-sectional view showing another embodiment of the apparatus according to the present invention; FIG. 1 is a power wrench, 1' is a power rotating body, 2 is a conventional rotating reaction force generating metal fitting, 2' is a rotating reaction force generating metal fitting of the present invention, and 2'' is another example of a rotating reaction force generating metal fitting of the present invention. A force generating metal fitting, 2 is another example of a rotational reaction force generating metal fitting in the present invention, 3 and 3' are protrusions of the rotational reaction force generating metal fittings 2 and 2', and 3'' is a rotational reaction force generating metal fitting. The bending deformation part due to bending of the metal fitting 2'', 4, 4' are torsional deformation parts of the rotational reaction force generating metal fittings 2, 2', 2'', 2, 5
is a resistance wire strain gauge, 6 is a comparison calculation circuit, 7 is an amplifier, 8 is an electric contact switch, 8' is an electric contact switch or fluid direction switching valve or clutch mechanism, 9 is a power supply, 9' is a power supply or fluid pressure Pump or other rotary drive source, 10 is an electric motor, 10' is an electric motor or fluid pressure motor or power transmission device, 10'' is an electric or fluid pressure motor 10 and 1
The output shaft 11 of 0' is a bearing case 12 of a reducer case, 13 is a protrusion provided at one end of the rotating reaction force generating metal fittings 2', 2, 14 is a rotating reaction force generating metal fitting 2', 2'', a pedestal fixed to the other end of 2, 15 a fulcrum pin, 16 a lever, 17 a male screw, 19 a locking nut, 20 a position limit switch, 22,
24 is a signal wire, 23 is a power wire, 2
3' is a power wire or pipe or a system line indicating power transmission; 25 is the axis of the rotating body including the power wrench; 26 is the reducer; 27 is the output shaft of the rotating body including the power wrench; 28 is the bearing; 29 30 is the nut rotation box, 30 is the bearing, 31, 33 is the bolt set, 32 is the nut of bolt set 31, 34
35 is a tightened body or fixed structure; 35 is a protrusion provided at one end of the rotational reaction force generating metal fitting 2″; 36, 3
7, 38, 39 are gears, 40, 41, 42 are rotating shafts of the gears, 43 is an arm fixed to the gear 39,
44 is a bracket.

Claims (1)

[Scope of Claims] 1. One end is connected to a torsional movement system that is in a relative rotational movement relationship with the output shaft of the rotating body through a gear mechanism but does not rotate, and the other end is connected to a fixed structure other than the rotating body or the above-mentioned structure. Torsional stress or bending stress with respect to the radius of rotation is generated in a rotational reaction force generating metal fitting that is locked or fastened to a fixing system of a rotating body fixed to an object, and the rotational reaction force generating metal fitting generated by the above-mentioned stresses is An angular movement amount with respect to an arbitrary radius consisting of either or both of the amount of twist and the amount of deflection due to bending for each arbitrary length in the axis or rotational radius direction, or the amount of expanded movement obtained by expanding the angular movement amount by mechanical means. A method for controlling the output torque of a power rotating body, characterized in that a position limit switch is activated to transmit an electric signal when any one of the respective movement amounts reaches a planned amount. 2. A torsionally deformed tubular portion including a helical shape disposed on an axis including an extension of the output shaft of the rotating body and supported at least at one end, and deflection due to bending protruding in the rotational radial direction with the axis as the center line. A rotating reaction force generating metal fitting consisting of one or both of the above deforming parts and a torsional movement system that does not cause rotational movement of a rotary body including one end of the rotating reaction force generating metal fitting, or a torsional movement system of the rotating body that does not cause rotational movement of the rotary body, or A cradle fixed to one of the fixed systems of the rotating body including the other end and further including a fixed structure, and either the torsional movement system or the fixed system of the rotational reaction force generating metal fittings. a protrusion fixed to the other system and in a relative angular movement relationship with the pedestal, a male screw is screwed into either the pedestal or the protrusion, and the male screw is screwed into the other. An output torque control device for a power rotating body, comprising a position limit switch that opens and closes according to a relative angular movement relationship. 3. A tubular torsionally deformed portion including a helical shape disposed on an axis including an extension of the output shaft of the rotating body and supported at least at one end, and deflection due to bending protruding in the rotational radial direction with the axis as the center line. A rotating reaction force generating metal fitting consisting of one or both of the above deforming parts and a torsional movement system that does not cause rotational movement of a rotary body including one end of the rotating reaction force generating metal fitting, or a torsional movement system of the rotating body that does not cause rotational movement of the rotary body, or A cradle fixed to one of the fixed systems of the rotating body including the other end and further including a fixed structure, and either the torsional movement system or the fixed system of the rotational reaction force generating metal fittings. a protrusion fixed to the other system and in a relative angular movement relationship with the pedestal, an enlarging mechanism consisting of a lever or a gear train, etc. is disposed on the cradle, and the protrusion is attached to one end of the enlarging mechanism. The male screw is engaged with either the rotating system that expands and moves at the other end or the non-rotating system that consists of the cradle, and the male screw is connected to the other system. An output torque control device for a power rotating body, comprising a position limit switch that opens and closes based on an expanded relative angular movement relationship.