JP2007050486A - Tightening torque control mechanism for impact wrench and torque control adapter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tightening torque control mechanism for an impact wrench and a torque control adapter capable of controlling tightening torque accurately by merely tightening by the impact wrench. <P>SOLUTION: A core cylinder 4 connected with a rotary driving shaft 1a side of the impact wrench 1 is arranged in an outer cylindrical part 3 connected with a side to be tightened such as a nut 11. A slip mechanism 5 for controlling torque using a spherical body 7 is provided between an outer peripheral part of the core cylinder 4 and an inner peripheral part of the outer cylindrical part 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tightening torque management mechanism and a torque management adapter for an impact wrench.

  Conventionally, a torque wrench has been used as a tool to manage the tightening torque of bolts and nuts. However, with a torque wrench, after tightening bolts and nuts with an impact wrench, use a torque wrench again. Tightening must be performed, and tightening torque management is cumbersome.

Thus, a torque limiter incorporated in an impact wrench or the like has been devised (Japanese Patent Laid-Open No. 05-269678). This torque limiter is built into an impact wrench and slips when it reaches a specified tightening torque in the process of tightening bolts, nuts, etc. with the impact wrench. Thus, the tightening torque can be managed, and the tightening torque can be easily managed.
JP 05-269678 A

  However, the above torque limiter has a problem that accurate tightening torque management cannot be performed. That is, the impact wrench emits an impact force in the axial direction as well as in the rotational direction because of its impact force generation mechanism. The torque limiter described above has a plane perpendicular to the rotational axis of the impact wrench. Since the tightening torque is managed by a slip mechanism that slips in the clutch type, the pushing force in the rotation axis direction changes due to the impact force in the rotation axis direction, and slip occurs at the set tightening torque. It was difficult to get up and it was difficult to control tightening torque accurately.

  In view of the above problems, the present invention provides a tightening torque management mechanism and a torque management adapter for an impact wrench that can perform accurate tightening torque management simply by tightening with an impact wrench. This is the issue.

  The above-described problem is that the core portion connected to the other side is disposed in the outer cylinder portion connected to one of the tightening target side and the rotation drive portion side of the impact wrench. This is solved by a tightening torque management mechanism for an impact wrench characterized in that a torque management slip mechanism is provided between the outer periphery of the outer cylinder and the inner periphery of the outer cylinder (first invention).

  According to this mechanism, the torque management slip mechanism is provided between the outer peripheral portion of the core portion and the inner peripheral portion of the outer cylinder portion. Even if both impact forces are applied, these impact forces do not affect or are unlikely to affect the slip torque value in the slip mechanism, so that slip can be generated with a set tightening torque, and accurate Tightening torque management can be performed.

  In addition, since the tightening torque management mechanism is configured such that either the core portion or the outer tube portion is connected to the rotation drive portion side of the impact wrench, the tightening torque can be simply tightened with the impact wrench. Management of the tightening torque can be easily performed.

  Further, the above problem is that the torque management mechanism according to the first aspect of the present invention is provided, and a connecting portion to the impact wrench side is provided on one side of the outer cylinder portion side and the core portion side, and the other side. This is similarly solved by a torque management adapter (second invention) for an impact wrench characterized in that a connecting portion to the tightening target side is provided on the side of the bolt.

  In particular, with this adapter, it is possible to perform tightening torque management by connecting to an impact wrench that does not have a torque management function. Compared to using an impact wrench with a built-in torque management function, tightening torque management can be achieved. This can be done at an advantageous cost.

  Since the present invention is as described above, accurate tightening torque management can be performed only by tightening with an impact wrench.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  The tightening torque management mechanism of the first embodiment shown in FIGS. 1 to 3 is incorporated in a torque management adapter 2 that is detachably jointed to the impact wrench 1. As shown in FIG. 2, the outer cylinder portion 3 and the core portion 4 are provided. The core portion 4 is disposed in the outer cylinder portion 3, and the outer peripheral portion of the core portion 4 and the outer cylinder portion 3 are arranged. A slip mechanism 5 for torque management is provided between the inner peripheral portion and the inner peripheral portion.

  The slip mechanism 5 includes a plurality of guide holes 6 provided on the outer peripheral portion of the core portion 4 at intervals in the circumferential direction, spheres 7 installed in the guide holes 6 so as to be able to advance and retreat, and the guide holes. 6... Spring 9 provided in the sphere 7, which exerts an outward urging force in the radial direction on each sphere 7, and a circumferential interval so as to correspond to the guide hole 6 in the inner peripheral portion of the outer cylinder portion 3. Are provided with a plurality of receiving engagement recesses 8 having a semicircular cross section for receiving the respective spheres 7... The core portion 4 and the outer cylinder portion 3 are rotated together by engagement with the rotational direction of the spheres 8... When a large torque exceeding the core portion 4 is applied, the spherical bodies 7 are attached to the springs 9. Retreat inward of the guide holes 6 in the core portion 4 against the force and disengage from the receiving engagement recesses 8 in the outer cylinder portion 3 to rotate relative to each other. To have.

  And, on the base end side of the core portion 4, a joint portion 10 is provided as a connecting portion detachably jointed to the rotation drive shaft 1 a of the impact wrench 1, and on the distal end side of the outer cylinder portion 3, A hexagonal hole 12 is provided as a connecting portion to a tightening target that is fitted and connected to a nut 11 as a tightening target and is in a rotationally engaged state.

  In the torque management adapter 2, the joint portion 10 on the proximal end side of the core portion 4 is jointed to the drive shaft 1 a of the impact wrench 1, and the hexagonal hole 12 of the outer cylinder portion 3 is fitted to the nut 11 and connected. When the impact wrench 1 is driven, as shown in FIG. 3A, the outer cylinder portion 3 rotates in conjunction with the rotation of the core portion 4, and the nut 11 is tightened. When the tightening torque reaches the set value, as shown in FIG. 3 (b), the core portion 4 is rotated leaving the outer cylinder portion 3, that is, slipping occurs, and the nut 11 is tightened as set. Become.

  In the above-described tightening process by the impact wrench 1, the impact force in the radial direction acts on the slip mechanism 5 even though the impact wrench 1 exerts a rotational impact force or a rotational axial impact force. The impact force in the rotational direction or the impact force in the rotational axis direction does not cause a change in the engagement force in the rotational direction between the sphere 7 in the slip mechanism 5 and the receiving engagement recess 8. Therefore, the core part 4 and the outer cylinder part 3 are rotated relative to each other with the set tightening torque, accurate tightening torque management is realized, and only the impact wrench 1 is used for tightening. The tightening torque is managed, and the tightening torque can be easily managed.

  In particular, in the present embodiment, the tightening torque management mechanism is incorporated in the torque management adapter 2 that is used jointly with the impact wrench 1. Therefore, as an impact wrench to be used, an impact wrench that does not have a torque management function. Thus, torque management can be performed more cost-effectively than when using an impact wrench with a built-in torque management function.

  In the second embodiment shown in FIG. 4, a spherical body is omitted as the slip mechanism 5, and instead of this, spring protrusions 13 are integrally attached to the outer peripheral portion of the core portion 4, and each spring protrusion 13. A structure that is fitted in the receiving engagement recesses 8 on the inner periphery of the cylindrical portion 3 is used. When the torque is equal to or less than a predetermined torque, the core is formed by the engagement between the spring projections 13 and the outer cylindrical portion 3. The part 4 and the outer cylinder part 3 rotate as a unit, but when a large torque exceeding that is applied, the spring protrusions 13 are elastically deformed in the direction of depression and the receiving recesses of the outer cylinder part 3 are received. The core portion 4 and the outer cylinder portion 3 are rotated relative to each other so that they are separated from the places 8. Others are the same as in the first embodiment.

  The spherical bodies 7 and the receiving engagement recesses 8 and the spring protrusions 13 and the receiving engagement recesses 8 give play in the rotational axis direction to release the impact force in the rotational axis direction of the impact wrench 1. It is also good to be able to do that.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the structure in which the core part 4 is connected to the impact wrench 1 side and the outer cylinder part 3 is connected to the nut 11 is shown, but the outer cylinder part side is connected to the impact wrench side. A connecting portion may be provided, and a connecting portion to the nut side may be provided on the core portion side.

  Further, in the above embodiment, two examples are shown as the slip mechanism, but the important point is that it is provided between the outer peripheral part of the core part and the inner peripheral part of the outer cylinder part, and is set with a predetermined tightening. A slip mechanism that can generate a relative rotation, that is, a slip by torque, may be employed, and various slip mechanisms may be used without being limited to the spheres 7 and the spring protrusions 13.

  Furthermore, although the case where the tightening torque management mechanism is incorporated in the torque management adapter has been described in the above embodiment, it may be configured as an impact wrench with a torque management mechanism in which the tightening torque management mechanism is built in the impact wrench.

1A and 1B show a tightening torque management mechanism according to an embodiment, in which FIG. 1A is a sectional front view, FIG. 2B is a sectional view taken along line II of FIG. 1A, and FIG. It is. Fig. (A) is an exploded sectional front view of the torque management mechanism, Fig. (B) is a sectional view taken along line II-II in Fig. (A), and Fig. (C) is a sectional view taken along line III-III in Fig. (A). . FIGS. 1A and 1B are cross-sectional plan views showing the operating state of the torque management mechanism. FIG. 4A is a cross-sectional plan view, FIG. 2B is a cross-sectional plan view of a core part to which a spring protrusion is attached, and FIG. 3C is a cross-sectional plan view of an outer cylinder part. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Impact wrench 1a ... Rotation drive shaft (rotation drive part)
2 ... Torque management adapter 3 ... Outer cylinder part 4 ... Core part 5 ... Slip mechanism 10 ... Joint part (connection part)
11 ... Nut (target to tighten)
12 ... Hexagon socket (connecting part)

Claims (2)

  A core part connected to the other side is arranged in the outer cylinder part connected to either the tightening target side or the rotation drive part side of the impact wrench. A tightening torque management mechanism for an impact wrench, characterized in that a slip mechanism for torque management is provided between the inner periphery of the cylinder portion.   The torque management mechanism according to claim 1 is provided, and a connecting portion to the impact wrench side is provided on one side of the outer tube portion side and the core portion side, and the tightening target side is provided on the other side. Torque management adapter for impact wrench, characterized in that a connecting part is provided.

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