JP2011042021A - Fastening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening device provided with a torque meter which measures and controls a fastening torque without having damages produced in a part of the torque meter. <P>SOLUTION: The fastening device 1 includes a torque meter 3 for measuring a fastening torque, when rotating and fastening a member to be fastened. The torque meter 3 has: an operating member 21 to turn by receiving a turning operation to a shaft center by an outer force; and turning member 34 turning on the shaft center, by receiving the turn of the operating member 21 via a spring member 33, and the torque meter 3 also has a control mechanism (a locking pin 133 and a control groove 143) for controlling the elastic deformation of the spring member 33 between the spring member 33 and the turning member 34, to restrain from becoming a predetermined level or higher. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tightening device such as a torque wrench. In particular, it is suitable for use in a tightening device having a torque meter capable of measuring a tightening torque.

When attaching a tire to a vehicle body, after inserting a wheel bolt protruding from a brake drum on the vehicle body side into a through hole formed in a disc wheel of the tire, the tire is attached to the vehicle body by tightening a wheel nut to the wheel bolt. Conversely, when removing the tire from the vehicle body, the tire is removed from the vehicle body by loosening and removing the wheel nut fastened to the wheel bolt from the wheel bolt.
When tightening or loosening the wheel nut to the wheel bolt, the operator uses a tightening device such as an impact wrench or a torque wrench disclosed in Patent Document 1.

  On the other hand, tires sometimes deviate from the vehicle body. This tire derailment occurs when the wheel nut is loosened or the wheel bolt is cut. Causes of the wheel bolt being cut include over tightening of the wheel nut, shrinkage due to cooling of the wheel bolt, and brittleness of the material due to cooling. Of these, over tightening of the wheel nut is the main cause. Therefore, the manufacturer defines a tightening torque for tightening the wheel nut so that the operator does not overtighten the wheel nut or the hole nut is not loosened.

JP-A 63-86973

  However, because of the psychological feeling that it is safe to tighten it, the operator may use an impact wrench or the like to overtighten the wheel nut beyond the specified tightening torque, or use a wrench that cannot measure the tightening torque. The wheel nut may be overtightened with a torque higher than the tightening torque. Therefore, a torque wrench equipped with a torque meter capable of measuring the tightening torque can manage the tightening torque, and can prevent excessive tightening or insufficient tightening.

  However, even with a torque wrench equipped with a torque meter, if the torque meter structure is a torque wrench that measures the tightening torque using the elastic force of the spring, the operator may use it with excessive tightening torque. When tightening or trying to forcibly loosen the tightened wheel nut, the spring may be plastically deformed in some cases. Furthermore, the torque meter spring breaks, and the function of the torque wrench itself that tightens the torque may be lost, and the wheel nut may not be tightened.

  The present invention has been made in view of the above-described problems, and in a tightening device including a torque meter capable of measuring the tightening torque and managing the tightening torque, the torque meter is lost. An object of the present invention is to provide a tightening device that does not occur.

  A tightening device according to the present invention is a tightening device including a torque meter that measures a tightening torque when rotating and tightening a member to be tightened, and the torque meter performs a rotation operation on an axis by an external force. An operating member that receives and rotates, and a rotating member that rotates about the axis by receiving the rotation of the operating member via a spring member, the spring member and the rotating member A regulating mechanism for regulating elastic deformation of the spring member that is greater than or equal to a predetermined distance is provided.

  According to the present invention, even when the member to be tightened is excessively tightened, the torque meter is not lost, and the reliability of measurement of the tightening torque by the torque meter can be improved.

It is a figure showing the whole torque wrench composition concerning this embodiment. It is a figure which shows the cross section of the torque wrench which concerns on this embodiment. It is a figure which shows the use condition of the torque wrench which concerns on this embodiment. It is a disassembled perspective view of the torque meter part concerning this embodiment. It is a figure which shows the spring member which concerns on this embodiment. It is a figure which shows operation | movement of the torque meter part which concerns on this embodiment. It is a figure for demonstrating operation | movement of the control mechanism which concerns on this embodiment. It is a figure for demonstrating operation | movement of the control mechanism which concerns on this embodiment.

Hereinafter, a tightening device according to the present invention will be described in detail with reference to the drawings. In the present embodiment, a torque wrench will be described as an example of the tightening device.
First, a torque wrench according to this embodiment will be described with reference to FIGS. FIG. 1 is a diagram illustrating an overall configuration of a torque wrench. FIG. 2 is a view showing a cross section of the torque wrench. FIG. 3 is a diagram illustrating a usage state of the torque wrench.
As shown in FIGS. 1 and 2, the torque wrench 1 according to the present embodiment is roughly constituted by a handle 2, a torque meter unit 3, a gear unit 4, a case unit 6, and a socket 7.

  The handle 2 is a handle for the operator to perform a turning operation with respect to the axial center direction of the torque wrench 1. When the operator rotates the handle 2 in the direction of the arrow shown in FIG. 1, the speed is reduced by the operation of the gear unit 4, and the socket 7 can be rotated in the direction of the arrow. As shown in FIG. 2, the handle 2 is configured to be inserted into and removed from the mounting hole 22 of the operation member 21.

Next, the torque meter unit 3 is configured to measure the tightening torque. As shown in FIG. 2, the torque meter unit 3 includes an operation member 21, an exterior member 32, a spring member 33, a rotation member 34, and the like. The rotation of the operation member 21 is transmitted to the rotation member 34 via the spring member 33.
For example, when the operator rotates the operating member 21 via the handle 2 and there is no resistance such that the nut is not tightened by the socket 7, the operating member 21 and the rotating member 34 are Rotate synchronously. However, when there is a resistance such as tightening the nut with the socket 7, the spring member 33 is elastically deformed according to the tightening torque of the operation member 21. Only the operating member 21 is displaced and rotated.

  As shown in FIG. 1, since the outer peripheral surface of the rotating member 34 and the outer peripheral surface of the exterior member 32 that rotates integrally with the operation member 21 are scaled, the operator The tightening torque is measured by reading the amount of deviation from the exterior member 32 from the scale. At this time, when the operator tightens with an excessive tightening torque and exceeds the elastic region of the spring member 33, the spring member 33 may be plastically deformed or the spring member 33 may be broken. Therefore, in the present embodiment, a restriction mechanism is provided that restricts the tightening torque not exceeding a predetermined value from being applied to the spring member 33. Details of this restricting mechanism will be described later with reference to FIGS.

Next, the gear unit 4 includes two planetary gear mechanisms that are continuously arranged in parallel. The gear unit 4 includes a first sun gear member 41, a first planet gear 45, a second sun gear member 47, a second planet gear 49, a carrier 51, a gear case 53, and the like.
The first sun gear member 41 has a rear portion coupled to the rotation member 34 and rotates in synchronization with the rotation member 34. Further, the first sun gear member 41 has a gear 44 formed on the outer periphery of the front portion, and meshes with a plurality of (for example, four) first planet gears 45. The plurality of first planet gears 45 mesh with an outer gear 54 formed on the inner periphery of the gear case 53. Therefore, when the first sun gear member 41 rotates, the first planet gear 45 revolves around the first sun gear member 41 while rotating. Further, shaft support pins 46 are respectively inserted into the plurality of first planet gears 45.

  The second sun gear member 47 is disposed over the entire length of the gear portion 4, supports the shaft support pins 46, and rotates in synchronization with the revolution of the first planet gears 45. The second sun gear member 47 is formed in a cylindrical shape so that the rear portion can receive the gear 44 of the first sun gear member 41 and the front portion is formed with a gear 48 having the same shape as the gear 44 of the first sun gear member 41. Yes. Here, in the present embodiment, the rotation of the first sun gear member 41 is decelerated to ¼ via the planetary gear mechanism to rotate the second sun gear member 47.

  The gear 48 of the second sun gear member 47 meshes with a plurality of (for example, four) second planet gears 49. The plurality of second planet gears 49 mesh with an outer gear 54 formed on the inner periphery of the gear case 53. Therefore, when the second sun gear member 47 rotates, the second planet gear 49 revolves around the second sun gear member 47 while rotating. Further, shaft support pins 50 are inserted into the plurality of second planet gears 49, respectively.

  The carrier 51 is disposed from substantially the middle of the gear portion 4 to the socket 7, and supports each pivot pin 50 and rotates in synchronization with the revolution of each second planet gear 49. The carrier 51 is formed in a cylindrical shape such that the rear part thereof can receive the gear 48 of the second sun gear member 47, the central part is formed with a slightly reduced outer diameter, and the front part can fit the socket 7. Thus, the fitting protrusion 52 having a polygonal cross section is formed. Here, in this embodiment, the rotation of the second sun gear member 47 is configured to rotate the carrier 51 by being reduced to ¼ through the planetary gear mechanism.

Next, the case part 6 is comprised so that the center part of the carrier 51 may be covered. As shown in FIG. 2, the case portion 6 is formed with an arm 61 that protrudes obliquely forward from a part of the outer periphery. When the operator rotates the handle 2, the arm 61 is kept in contact with a structure disposed near the distal end portion 62 of the arm 61 so that the case portion 6 does not rotate together. can do.
The case portion 6 is provided with a grease nipple 63 at the base of the arm 61. By injecting grease from the grease nipple 63, the grease can be supplied into the gear portion 4 through the space between the case portion 6 and the carrier 51.

  Next, the socket 7 is formed with a socket hole 71 that matches the outer shape of a nut as a tightening member to be tightened or loosened at the front. Further, the socket 7 is formed with a fitting hole 72 in the rear part for fitting into the fitting protrusion 52 of the carrier 51 for mounting. The socket 7 can be removed from the carrier 51 by pulling out the socket 7 from the fitting protrusion 52 against the bias of the steel ball 55 provided on the carrier 51. The socket 7 is prepared with a plurality of sockets 7 according to the size of various nuts.

Here, with reference to FIG. 3, the usage method of the torque wrench which concerns on this embodiment is demonstrated concretely. Here, a case where the tire is attached to the vehicle body by tightening the wheel nut to the wheel bolt will be described. As shown in FIG. 3, the operator rotates the handle 2 in the arrow direction in a state where the wheel nut 80 a indicated by a broken line is fitted in the socket hole 71 of the socket 7. The rotation of the handle 2 is finally transmitted to the socket 7 via the torque meter unit 3 and the gear unit 4 as described above, and is rotated in the arrow direction.
In the present embodiment, the planetary gear mechanisms for rotating the rotation from one side by decelerating 1/4 to the other side are continuously arranged. Therefore, the rotation of the handle 2 is reduced to 1/16. And transmitted to the socket 7. That is, 16 times the torque can be output.

When the operator is tightening the wheel nut 80a, the tightening torque can be measured by reading the amount of deviation between the exterior member 32 and the rotating member 34 of the torque meter unit 3 from the scale. Therefore, the operator can rotate the wheel nut 80a with a specified tightening torque.
Further, when the operator is tightening the wheel nut 80a, the front end 62 of the arm 61 is brought into contact with the adjacent wheel nut 80b to prevent the torque wrench 1 from rotating together due to the rotation of the handle 2. Can do.

Next, the detailed configuration and operation of the torque meter unit 3 will be described. First, the details of each component of the torque meter unit will be described with reference to FIG. FIG. 4 is an exploded perspective view of the torque meter unit 3.
First, as shown in FIG. 4, the rotating member 34 is formed in a columnar shape, and a through hole 130 is formed along the axial direction so that the rear portion of the first sun gear member 41 can be inserted. A concave groove 131 is formed on the rear surface of the rotating member 34. The concave groove 131 is formed so that the size in the axial direction is slightly larger than the outer diameter dimension of the spring member 33 and the depth is the thickness of the spring member 33 so that the spring member 33 can be accommodated in the concave groove 131. It is formed approximately to T. Further, in the rotating member 34, a locking pin 132 and a restriction pin 133 as a restriction portion protrude from the bottom surface of the concave groove 131 along the axial direction. Here, a part of the locking pin 132 and the regulation pin 133 is embedded in a pin hole (not shown) formed in the bottom surface of the concave groove 131, so that the locking pin 132 and the regulation pin 133 are rear part of the rotating member 34. It protrudes toward The locking pin 132 and the regulation pin 133 are disposed at substantially the same circumferential position when the rotating member 34 is viewed from the axial direction. In addition, the outer peripheral surface of the rotating member 34 is provided with three scales 134 that are parallel along the axial direction. Further, a screw hole 135 for screwing a not-shown set bolt is formed on the outer periphery of the rotating member 34.

Moreover, as shown in FIG. 4, the spring member 33 is substantially horseshoe-shaped lacking a part of a flat ring, and is formed of, for example, a spring steel material. The spring member 33 is formed so that the size in the axial direction is slightly smaller than the inner diameter of the concave groove 131 of the rotating member 34. When an external force is applied to the spring member 33 to widen a gap lacking a part of the ring or an external force to reduce the gap is applied, an elastic force is generated to return to the original shape.
Further, a locking hole 141 into which the locking pin 132 of the rotating member 34 is inserted is formed at one end adjacent to the gap of the spring member 33. Further, a locking hole 142 into which a locking pin 155 of the operation member 21 described later is inserted is formed at the other end adjacent to the gap of the spring member 33. Further, on the surface of the spring member 33 facing the rotating member 34, a long groove-shaped restriction groove portion 143 into which the restriction pin 133 is inserted is formed.

Here, with reference to FIG. 5, the regulation groove part 143 formed in the spring member 33 is demonstrated. FIG. 5 is a front view showing the spring member 33 as viewed from the axial direction and a cross-sectional view taken along the line I-I of the restriction groove 143. The regulating groove 143 formed in the spring member 33 is on the circumference of the same radius as the locking holes 141 and 142 from the center O of the spring member 33, and is formed in an arc shape.
The regulation groove 143 is formed in the second quadrant together with the locking hole 142 when the x-axis is pulled horizontally from the center O of the spring member 33 and the y-axis is pulled vertically. Further, as shown in the cross-sectional view taken along the line I-I, the regulation groove 143 is formed with a depth up to about half of the thickness T of the spring member 33.

Next, as shown in FIG. 4, the operation member 21 is formed by connecting a cylindrical large diameter portion 151 and an elongated small diameter cylindrical portion 152. Further, the operating member 21 has a shaft hole 156 formed along the axial direction from the front portion to the center portion so that the rear portion of the first sun gear member 41 can be inserted. Further, a disc portion 153 protrudes from the center of the front surface of the large diameter portion 151. The disk portion 153 is formed so that the size in the axial direction is slightly smaller than the inner diameter dimension of the spring member 33 so that the disk portion 153 can be positioned inside the inner diameter of the spring member 33, and the protruding amount is the thickness T of the spring member 33 It is formed to the same extent.
The large-diameter portion 151 of the operation member 21 has a locking pin 155 protruding from the front surface along the axial direction. Here, by embedding a part of the locking pin 155 in a pin hole (not shown) formed on the front surface of the large diameter portion 151, the locking pin 155 is protruded toward the front portion of the large diameter portion 151. Yes. The locking pin 155 is inserted into the locking hole 142 of the spring member 33. Further, a screw hole 154 for screwing a not-shown set bolt is formed on the outer periphery of the large diameter portion 151.

  Next, as shown in FIG. 4, the exterior member 32 is formed by combining a cylindrical exterior portion 161 and a small diameter portion 162. A fitting hole 164 is formed in the exterior portion 161 of the exterior member 32 so that the large diameter portion 151 of the operation member 21 can be fitted therein. Further, a through hole 163 through which the small diameter cylindrical portion 152 of the operation member 21 can pass is formed in the small diameter portion 162 of the exterior member 32. A screw hole 165 for screwing a not-shown set bolt is formed on the outer periphery of the small diameter portion 162. In addition, a single scale 166 is provided on the outer peripheral surface of the exterior portion 161 in parallel along the axial direction.

When assembling the torque meter unit 3, first, the spring member 33 is accommodated in the concave groove 131 of the rotating member 34. At this time, the locking pin 132 of the rotation member 34 is inserted into the locking hole 141 of the spring member 33, and the restriction pin 133 of the rotation member 34 is positioned in the restriction groove 143.
Next, the operating member 21 is overlapped with the rotating member 34 so that the axial directions thereof coincide with each other. At this time, the locking pin 155 of the operating member 21 is inserted into the locking hole 142 of the spring member 33, and the disc portion 153 of the operating member 21 is fitted into the inner diameter of the spring member 33.

After the rotation member 34, the spring member 33, and the operation member 21 are superposed in this manner, the rear portions of the first sun gear member 41 are respectively connected to the through hole 130, the spring member 33, and the operation member 21 of the rotation member 34. The shaft hole 156 is inserted through. Next, a set screw is screwed into the screw hole 154 of the operation member 21 to contact the groove 42 of the first sun gear member 41. Further, a set screw is screwed into the screw hole 135 of the rotating member 34 and the screw hole 43 of the first sun gear member 41. Thus, the rotation member 34 and the operation member 21 are coupled via the first sun gear member 41 by screwing the set screw.
Next, the exterior member 32 is inserted from the rear portion of the operation member 21. Then, in a state where the operation member 21 is covered, a set screw is screwed into the screw hole 165 of the exterior member 32 and is brought into contact with the outer periphery of the small diameter cylindrical portion 152 of the operation member 21. At this time, the exterior member 32 is rotated with respect to the operation member 21, and the set screw is tightened in a state where the scale 166 of the exterior member 32 is aligned with the center of the three scales 134 of the rotation member 34. The torque meter unit 3 can be configured by assembling as described above. Here, although the scale 166 of the exterior member 32 and the scale 134 of the rotating member 34 are described as one set, they are not limited to one set, and may be configured by two or more sets.

Next, a method for an operator to measure the tightening torque in the torque meter unit 3 configured as described above will be described with reference to FIGS. 4 and 6. Here, FIG. 6A is a view of the rotating member 34 and the exterior member 32 as seen from a direction orthogonal to the axial direction. FIG. 6B is a view of the rotating member 34 and the spring member 33 corresponding to FIG. 6A viewed from the axial direction.
Normally, in the torque meter unit 3, the scale 166 of the exterior member 32 is located at the center of the three scales 134. In addition, the regulation pin 133 is located at the center in the long groove of the regulation groove 143.

Here, when the operator rotates the operation member 21 clockwise with respect to the axial direction via the handle 2, the locking pin 155 of the operation member 21 moves the spring member 33 to the arrow shown in FIG. Rotate in the R direction. Here, when there is no resistance to rotating the rotating member 34, that is, for example, in the initial stage where the wheel nut is started to be tightened against the wheel bolt, the spring member 33 is not elastically deformed and the rotating member 34 is not involved. The locking pin 132 is rotated in the arrow R direction.
That is, the rotation member 34 rotates in synchronization with the operation member 21 via the spring member 33. Accordingly, since the exterior member 32 that rotates integrally with the operation member 21 also rotates in a similar manner, the exterior member 32 and the rotation member 34 are formed of the exterior member 32 as shown in FIG. The scale 166 is rotated in a state where it is always located at the center of the three scales 134 of the rotating member 34.

  Next, a case where there is resistance to rotating the rotating member 34, that is, a state where the wheel nut has been tightened with respect to the wheel bolt, or a case immediately before the tightening is described, will be described. In this case, since the rotation member 34 can hardly rotate, the position of the locking pin 132 of the rotation member 34 does not change. Therefore, when the operator rotates the operating member 21 clockwise with respect to the axial direction via the handle 2, only the locking pin 155 of the operating member 21 moves in the direction of the arrow R while being elastically deformed by the spring member 33. Moving. In other words, the spring member 33 is deformed so that both end portions of the spring member 33 are close to each other and there is no gap.

  At this time, since the exterior member 32 is also integrally rotated with the operation member 21 in the direction of the arrow R, only the scale 166 shown in FIG. 6A is rotated in the direction of the arrow R. Therefore, the scale 134 and the scale 166 Deviation occurs between the two. That is, the greater the amount of displacement, the more the operator applies tightening torque to the operation member 21 via the handle 2 against the elastic force of the spring member 33. Therefore, the tightening torque currently rotated through the handle 2 can be measured by checking the amount of deviation by the operator. In this embodiment, the amount of shift on a scale is set to a specified tightening torque (for example, 588 [N · m]). Therefore, the operator can easily confirm that the tightening is performed with the specified tightening torque by rotating the operation member 21 until the scale is just shifted.

  Thus, since the operator can easily confirm the current tightening torque, the worker can be rotated with the specified tightening torque, and overtightening or insufficient tightening of the member to be tightened can be prevented.

  Next, when the operator inadvertently rotates the operation member 21 further, there is a possibility that it may be plastically deformed or broken beyond the elastic region of the spring member 33. Therefore, in the present embodiment, a regulation mechanism that regulates excessive deformation of the spring member 33 is provided. FIG. 7 is a diagram for explaining the operation of the restriction mechanism. FIG. 7A is a view of the rotating member 34 and the exterior member 32 as seen from a direction orthogonal to the axial direction. FIG. 7B is a view of the rotating member 34 and the spring member 33 corresponding to FIG. 7A viewed from the axial direction. In FIG. 7B, the operator rotates the operation member 21 clockwise with respect to the axial direction via the handle 2, and only the locking pin 155 of the operation member 21 is accompanied by elastic deformation of the spring member 33. The state which moved to the arrow R direction is shown. The spring member 33 is deformed so that both end portions of the gap are almost in contact with each other.

At this time, as shown in FIG. 7B, the regulation groove portion 143 formed in the spring member 33 is also moved by the elastic deformation of the spring member 33. Due to the movement of the restriction groove portion 143, the restriction pin 133 of the rotating member 34 comes into contact with one end portion in the restriction groove portion 143. Therefore, even if the operating member 21 is further rotated from this state and the locking pin 155 is rotated in the direction of the arrow R, the force is generated between the one end in the regulating groove 143 and the regulating pin 133. As a result, the spring member 33 is not deformed beyond the state shown in FIG.
Thus, even when the operator inadvertently rotates the operation member 21 further, the restriction groove portion 143 and the restriction pin 133 as the restriction mechanism receive the torque, so that the torque is transmitted to the spring member 33. Therefore, the spring member 33 is not excessively deformed to be plastically deformed or broken.

Next, the operation in the case where the operator loosens the nut in the torque meter unit 3 configured as described above will be described with reference to FIGS. 4 and 8.
When the operator rotates the operating member 21 counterclockwise with respect to the axial direction via the handle 2, the locking pin 155 of the operating member 21 moves the spring member 33 in the direction of the arrow L shown in FIG. Rotate. Here, when there is no resistance to rotating the rotation member 34, that is, for example, when the wheel nut is completely loose with respect to the wheel bolt, the spring member 33 is not elastically deformed, and the rotation member 34 The locking pin 132 is rotated in the arrow L direction.
That is, the rotation member 34 rotates in synchronization with the operation member 21 via the spring member 33. Accordingly, since the exterior member 32 that rotates integrally with the operation member 21 also rotates in a similar manner, the exterior member 32 and the rotation member 34 are formed of the exterior member 32 as shown in FIG. The scale 166 is rotated in a state where it is always located at the center of the three scales 134 of the rotating member 34.

  Next, a case where there is resistance to rotating the rotating member 34, that is, a case where, for example, a wheel nut is firmly tightened to a wheel bolt will be described. In this case, since the rotation member 34 can hardly rotate, the position of the locking pin 132 of the rotation member 34 does not change. Therefore, when the operator rotates the operating member 21 counterclockwise with respect to the axial direction via the handle 2, only the locking pin 155 of the operating member 21 moves in the direction of the arrow L while being elastically deformed by the spring member 33. Moving. That is, the spring member 33 is deformed so that the both ends of the spring member 33 are separated and the gap is widened.

At this time, since the exterior member 32 is also integrally rotated with the operation member 21 in the direction of arrow L, only the scale 166 shown in FIG. 6A is rotated in the direction of arrow L. Therefore, the scale 134 and the scale 166 Deviation occurs between the two. That is, the greater the amount of displacement, the more the operator applies torque to the operation member 21 via the handle 2 against the elastic force of the spring member 33.
Here, if the wheel nut is firmly tightened, the operation member 21 may be plastically deformed or broken beyond the elastic region of the spring member 33 when the operation member 21 is forcibly rotated.

  The restriction mechanism described above can also restrict excessive deformation of the spring member 33 at this time. FIG. 8 is a diagram for explaining the operation of the restriction mechanism. FIG. 8A is a view of the rotating member 34 and the exterior member 32 as seen from a direction orthogonal to the axial direction. FIG. 8B is a view of the rotating member 34 and the spring member 33 corresponding to FIG. 8A viewed from the axial direction. In FIG. 8B, the operator rotates the operation member 21 counterclockwise with respect to the axial direction via the handle 2, and only the locking pin 155 of the operation member 21 is accompanied by elastic deformation of the spring member 33. The state which moved to the arrow L direction is shown. The spring member 33 is deformed so that a large gap is generated.

At this time, as shown in FIG. 8B, the regulation groove portion 143 formed in the spring member 33 is also moved by the elastic deformation of the spring member 33. Due to the movement of the restriction groove portion 143, the restriction pin 133 of the rotating member 34 comes into contact with the other end portion in the restriction groove portion 143. Therefore, even if the operating member 21 is further rotated from this state and the locking pin 155 is rotated in the direction of the arrow L, the force is generated between the other end portion in the restriction groove 143 and the restriction pin 133. Since it is received, the spring member 33 is not deformed beyond the state shown in FIG.
As described above, even when the wheel nut is firmly tightened and the operation member 21 is excessively rotated, the restriction groove portion 143 and the restriction pin 133 as the restriction mechanism receive the torque. It is not transmitted to the member 33, and the spring member 33 is not excessively deformed and plastically deformed or broken. Further, the inside of the rotating member 33 is not damaged by the excessively deformed spring member 33.

  In this embodiment, the case where the operator tightens the wheel nut with respect to the wheel bolt by rotating the operation member 21 clockwise with respect to the axial direction via the handle 2 has been described. Even the wheel nuts and wheel bolts of the above work similarly. That is, the operator can easily confirm that the operation member 21 has been tightened with the specified tightening torque by rotating the operation member 21 counterclockwise until the graduation has just shifted. Even if the operator inadvertently turns the operation member 21 further counterclockwise, the restriction groove portion 143 and the restriction pin 133 as the restriction mechanism receive the torque, and the torque is transmitted to the spring member 33. Therefore, the spring member 33 is not excessively deformed to be plastically deformed or broken.

  Further, in the present embodiment, only the case where the regulation groove portion 143 of the spring member 33 is formed in the second quadrant as shown in FIG. 5 has been described. However, the present invention is not limited to this case and may be formed in the first quadrant. . In this case, the restriction pin 133 of the rotating member 34 may be similarly provided at a position where it is fitted into the restriction groove 143. However, the restriction pin 133 is provided with the restriction groove part 143 by providing the restriction groove part 143 and the restriction pin 133 at a position (second quadrant) close to the locking pin 155 of the operation member 21 on the movable side as in the present embodiment. The relative distance to move inside becomes longer. Therefore, it is not necessary to strictly manage the dimensional accuracy of the restriction groove 143, and the manufacturing cost can be reduced. On the other hand, when the restriction groove portion 143 and the restriction pin 133 are provided at a position (first quadrant) close to the locking pin 132 of the rotating member 34 on the fixed side, the relative distance that the restriction pin 133 moves the restriction groove portion 143. Becomes shorter. In this case, it is necessary to strictly manage the dimensional accuracy of the restriction groove 143 and restrict excessive deformation of the spring member 33 by the restriction groove 143 and the restriction pin 133.

  Further, in the regulation mechanism of the present embodiment, the case where the regulation groove portion 143 forms a bottomed concave groove on one surface of the spring member 33 has been described. However, the invention is not limited to this case, and the spring member 33 penetrates in the plate thickness direction. It may be a restriction groove formed in a hole shape. However, by forming the regulation groove 143 on the one surface of the spring member 33 as in the present embodiment, the rigidity of the spring member 33 can be improved and the spring characteristics can be prevented from changing greatly.

Moreover, although the regulation mechanism of this embodiment demonstrated the case where it comprised from the regulation pin 133 provided in the rotation member 34, and the regulation groove part 143 provided in the spring member 33, it is not restricted to this case. . That is, for example, a restriction groove portion may be provided on the rotating member 34, and a restriction pin that moves in the restriction groove portion may be provided on the spring member 33.
Further, in the present embodiment, only the case of tightening the wheel nut has been described as an example. However, the present invention is not limited to this case, and can be used for tightening or loosening nuts or bolts other than the wheel nut.

  Further, in the present embodiment, only the torque wrench provided with the gear portion is described as an example of the tightening device. However, the present invention is not limited to this case. If the torque meter capable of measuring the tightening torque by the spring member is provided, the gear It may be a tightening device such as a wrench having no part.

1: Torque wrench 2: Handle 3: Gear part 4: Torque meter part 6: Case part
7: Socket 21: Operation member 32: Exterior member 33: Spring member 34: Rotating member
41: First sun gear member 45: First planet gear 47: Second sun gear member 49: Second planet gear 51: Carrier 132: Locking pin 133: Restriction pin 134: Scale 141: Locking hole 142: Locking hole 143 : Restriction groove 155: Locking pin 166: Scale

Claims (5)

A tightening device including a torque meter for measuring a tightening torque when rotating and tightening a member to be tightened,
The torque meter has an operation member that rotates in response to a rotation operation with respect to the axis by an external force;
A rotation member that rotates with respect to the axis by receiving the rotation of the operation member via a spring member;
A clamping device comprising a regulating mechanism for regulating a predetermined or more elastic deformation of the spring member between the spring member and the rotating member. The regulation mechanism is
A regulating groove provided on one of the rotating member or the spring member;
The tightening according to claim 1, further comprising: a restricting portion that is provided on the other of the rotating member or the spring member and moves in the restricting groove portion according to elastic deformation of the spring member. apparatus. The spring member is a ring-shaped spring having a gap in which a part of the ring is missing,
The operating member and the ring-shaped spring are coupled at one end of the ring-shaped spring,
The fastening device according to claim 1, wherein the ring-shaped spring and the rotating member are coupled to each other at the other end of the ring-shaped spring.   The tightening device according to claim 3, wherein the restriction groove portion is formed in an arc shape on a surface of the ring-shaped spring.   The tightening device according to claim 4, wherein the restriction groove is formed in a bottomed shape.

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