JPH06155321A - Torque transmission device - Google Patents

Abstract

PURPOSE:To provide a torque transmission device useful as a tool to carry out tightening work of a bolt through a small clearance from the cross direction of the bolt. CONSTITUTION:This torque transmission device 100 is furnished with an outside circular jig 2 to connect and disconnect a bolt B from the direction vertical to its rotation axis and a rotation drive device 1 to axially rotate the bolt B by way of giving rotation to the jig 2 by means of making contact with the outside circumferential surface of the jig 2 on two points or two surfaces. Additionally, the rotation drive device 1 is furnished with an electric motor 4, a transmission mechanism to transmit rotation of the electric motor 4 to the jig 2 and a rotation control part 11 to control rotation of the electric motor 4 by way of detecting slippage of rotation of the jig 2 against rotation of the electric motor 4. Consequently, through small clearance from the cross direction of the bolt B, it is possible to carry out tightening work of the bolt B. Additionally, it is possible to constantly keep engine speed most suitable for transmission of torque.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque transmission device, and more particularly to a torque transmission device useful for tightening bolts from a lateral direction of the bolt through a narrow gap.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view showing a mode of bolt tightening work with an electric wrench. This electric wrench 700
Is provided with a socket 701 which can be attached to and detached from the head of the bolt B from above, and an electric drive device 702 in which an electric motor (not shown) is installed. The socket 701,
The head of the bolt B is fitted from above, and the socket 701 is rotated to axially rotate the bolt B for tightening.

[0003]

In the transmission 700 described above, when the clearance between the head of the bolt B and the structure K is small, the tightening work cannot be performed, and as shown in FIG.
There was no choice but to put in from the side and tighten bolt B. However, when the gap in the lateral direction is also small, the wrench 18 can be rotated only slightly, so that the wrench 18 needs to be frequently inserted and withdrawn, resulting in a heavy work load.

Therefore, an object of the present invention is to provide a torque transmission device useful as a tool for tightening a bolt through a narrow gap in the lateral direction of the bolt.

[0005]

SUMMARY OF THE INVENTION In a first aspect, the present invention relates to a jig having a circular outer shape which can be attached to and detached from a target member having a non-circular outer shape which is intended to be axially rotated, in a direction perpendicular to its rotation axis. And a rotary drive device that axially rotates the target member by contacting the outer circumferential surface of the jig at two points or surfaces to rotate the jig. A torque transmission device is provided.

According to a second aspect of the present invention, in the above torque transmission device, the rotary drive device includes an electric motor,
A transmission mechanism for transmitting the rotation of the electric motor to the jig, and a rotation control unit for detecting the slip of the rotation of the electric motor and the rotation of the jig to control the rotation of the electric motor. A torque transmission device is provided.

[0007]

In the torque transmitting device of the present invention, a jig having a circular outer shape is mounted on a target member (for example, the head of a bolt) having a non-circular outer shape which is intended to be rotated, from a direction perpendicular to the rotation axis. . Then, the rotation driving device makes contact with the circumferential surface of the outer shape of the jig at two points or surfaces to rotate the jig. As a result, the bolt can be tightened through the narrow gap in the lateral direction of the bolt.

The rotation drive device detects the rotation of the electric motor, the transmission mechanism for transmitting the rotation of the electric motor to the jig, the slip of the rotation of the electric motor and the rotation of the jig, and the rotation of the electric motor. A rotation control unit for controlling is provided. Therefore, it is possible to always control the rotation speed to be optimum for torque transmission.

[0009]

The present invention will be further described below with reference to the embodiments shown in the drawings. The present invention is not limited to this.

First Embodiment FIG. 1 is a torque transmission device 1 according to a first embodiment of the present invention.
It is a side view of 00. FIG. 2 is a plan view of the torque transmission device 100. FIG. 3 is an explanatory diagram of a control system of the torque transmission device 100. FIG. 4 is a perspective view showing the jig 2 of the torque transmission device 100. This torque transmission device 100 is
It comprises a rotary drive device 1 and a jig 2. Rotation drive device 1
In 3, the reference numeral 3 is a main body of the rotary drive device, and the electric motor 4 is installed therein. A belt wheel 5 is attached to the rotating shaft of the electric motor 4. The rotation drive device body 3 includes an arm 7a,
7b is locked. The angle formed by the arms 7a and 7b is held by a spring (not shown). This arm 7a, 7
Idler 8a, 8b is rotatably supported at the tip of b. Then, the belt 9 is stretched around the belt wheel 5 and the idlers 8a and 8b. Further, the belt 9 is preferably a flat belt or a V-belt in order to reduce the load on the electric motor 4, and a rubber sheet or the like is attached to the surface contacting the jig 2.
It is better to improve the friction force. 10 is a grip portion 31
It is a switch of the rotation drive device 1 provided in the.

Reference numeral 11 is a rotation controller. Reference numeral 12 is a detector for detecting the rotation speed of the jig 2. The detector 12 is
For example, it is a photodiode or a Hall element, and is provided on the shaft that supports the idler 8a or 8b. Corresponding to this, a reflector and a magnetic body are provided at predetermined positions on the outer circumference of the jig 2. Reference numeral 13 is a detector for detecting the rotation speed of the electric motor 4. The detector 13 is, for example, a rotary encoder. The rotation control unit 11 controls the rotation speed of the jig 2 and the electric motor 4.
And a rotation speed adjusting circuit 15 for adjusting the rotation speed of the electric motor 4 in response to a signal from the slip detecting circuit 14.

As shown in FIG. 4, the jig 2 can be divided into two parts. When they are integrated, the convex portion 23a and the concave portion 23b are fitted and locked by the pin 22. At this time, the jig 2
Has a circular outer diameter, and the hollow portion has the same shape as the head of the bolt B. The number of divisions of the jig 2 is not limited to two. Further, the jig 2 may have a structure in which only a part of the jig 2 can be opened and closed.

Next, the operation of the torque transmission device 100 will be described. The jig 2 is attached to the head of the bolt B from the direction perpendicular to the bolt B, the belt 9 between the idlers 8a and 8b of the rotary drive device 1 is pressed against the outer periphery of the jig 2 from the side, and the switch 10 is pressed. Then, the electric motor 4 operates, the belt wheel 5 rotates, and the belt wheel 5 and the idler 8a,
The jig 2 is rotated via the belt 9 stretched around 8b. As a result, the bolt B is axially rotated and tightened. Therefore, the bolt B can be tightened through the narrow gap in the lateral direction of the bolt B. The slip detection circuit 14 detects a slip from the difference between the rotation speed of the jig 2 and the rotation speed of the electric motor 4, and the rotation adjustment circuit 15 detects the rotation speed of the electric motor 4 from the slip detected by the slip detection circuit 14. adjust. Therefore, it is possible to always control the rotation speed to be optimum for torque transmission. Further, the belt 9 is deformed along the shape of the jig 2, the jig 2 and the belt 9 are in surface contact with each other, and the jig 2 is sandwiched by the idlers 8a and 8b, so that sufficient torque is transmitted. . Further, it is possible to absorb a slight difference in size of the jig 2.

-Second Embodiment- FIG. 5 shows a torque transmission device 500 according to a second embodiment of the present invention.
FIG. In this torque transmission device 500, on the arm 51 provided in the rotation drive device main body 3,
A pinch roller 52 is arranged in parallel with the shaft of the electric motor 4 so as to interlock with each other. Other configurations are similar to those of the first embodiment. Figure 5
, The pinch roller 52 is pressed against the outer circumferential surface of the jig 2 at two points, the jig 2 is rotated, and the bolt B
Can be tightened.

-Other Embodiments-In the first embodiment, the detector 13 may be replaced by storing the rotation speed of the electric motor 4 in a memory (not shown).
In the second embodiment, only the portion that comes into contact with the jig 2 may be a pinch roller, and the other portions may use gears to transmit torque. Furthermore, if the force with the jig 2 is balanced, 3
You may make it contact at a point or more. The present invention is not limited to bolts, and is also suitable for rotating other non-circular shafts.

[0016]

According to the torque transmission device of the present invention, the bolt can be tightened through the narrow gap from the lateral direction of the bolt. In addition, the optimum rotation speed for torque transmission can always be maintained.

[Brief description of drawings]

FIG. 1 is a side view of a torque transmission device according to a first embodiment of the present invention.

2 is a plan view of the torque transmission device of FIG. 1. FIG.

FIG. 3 is an explanatory diagram of a control system of the torque transmission device of FIG.

4 is a perspective view showing a jig of the torque transmission device of FIG. 1. FIG.

FIG. 5 is a main part explanatory view showing a torque transmission device according to a second embodiment of the present invention.

FIG. 6 is an explanatory view showing a mode of bolt tightening work using a conventional electric wrench.

FIG. 7 is an explanatory view showing a mode of conventional bolt tightening work.

[Explanation of symbols]

 100,500 torque transmission device 1 rotation drive device 2 jig 22 pin 23a convex portion 23b recessed portion 3 rotation drive device body 4 electric motor 5 belt wheel 6 arm rotation shaft 7a, 7b arm 8a, 8b idler 9 belt 10 switch 11 rotation control unit 12, 13 Detector 14 Slip detection circuit 15 Rotation adjustment circuit 51 Arm 52 Pinch roller B Bolt K Structure

Claims (2)

[Claims] 1. A jig having a circular outer shape that can be attached to and detached from a target member having a non-circular outer shape that is about to be rotated about its axis from a direction perpendicular to the axis of rotation, and two points on the outer circumferential surface of the jig. Alternatively, a torque transmission device comprising: a rotation driving device that axially rotates the target member by bringing the jig into rotation by making a surface contact. 2. The torque transmission device according to claim 1, wherein the rotation drive device includes an electric motor, a transmission mechanism that transmits rotation of the electric motor to the jig, and rotation of the jig with respect to rotation of the electric motor. And a rotation control unit that controls the rotation of the electric motor by detecting slippage of the torque transmission device.