JPH0588875U - Compliance socket for nutrunner - Google Patents

Abstract

(57) [Summary] [Purpose] When tightening bolts using a nut runner, prevent transmission of tightening torque and damage to bolt heads due to the mismatch of the center axis of the nut runner output shaft and socket. To do. [Structure] A socket body 4 having a bolt head or a recessed portion 7 for fitting a nut 1 formed at a tip end of an output shaft 2A of a nut runner via a fixing pin 3 is loosely fitted and supported in a swingable manner. A shaft having a conical steel ball supporting surface 5A at the axial center portion of the socket body 4 and an equal diameter hole 5B extending from the conical steel ball supporting surface 5A toward the output shaft 2A in an end face open state. A hole 9 is bored and a steel ball 8 is placed in the shaft hole 9.
By fitting the compression spring 6 and the spring, the self-centering function is given to the socket of the nut runner.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a compliance socket for a nut runner.

[0002]

[Prior art and its problems]

 A nutrunner that automatically tightens bolts and nuts uses a simple, low-cost compliance socket (hereinafter referred to as socket) 4 as shown in Fig. 2. This socket 4 is attached to the output shaft 2A of the motor 2 of the nut runner 10, the bolt head (or nut. The same applies below) 1 is fitted in the recess 7 at the tip, and the bolt 1 is tightened by the rotation of the motor 2. To do.

By the way, the axis of the output shaft 2A and the axis of the socket 4 need to coincide (compliance) with each other. If these axes are significantly deviated, when the bolt head 1 is to be tightened. There is a possibility that the socket 4 swings around and the hexagonal head of the bolt head 1 is damaged. Therefore, the conventional socket 4 exerts a simple and low-cost compliance function. Therefore, the base end of the socket 4 is rotatably attached to both ends of the pin 3 protruding in the diameter direction from the output shaft 2A. A compression spring 6 is arranged between the shaft 4 and the output shaft 2A. In order to give the socket 4 a degree of freedom, a clearance G ₁ is formed between the output shaft 2A and the socket 4, and a clearance L ₂ is formed between the pin 3 and the pin hole 4A. With the socket thus configured, although the socket 4 has a simple structure, the socket 4 is always kept upright by the force of the compression spring 6, so that the output shaft 2A and the socket 4 can be aligned to some extent. Is.

However, since the compression spring 6 has a weak restoring force in the radial direction, when the socket 4 is displaced especially along the longitudinal direction of the pin 3, the socket 4 is not completely aligned with the output shaft 2A. In some cases, the bolt head 1 was tightened with some whirling. For this reason, if the displacement of the socket 4 is large, the bolt head 1 may be damaged.

[0005]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention provides a compliance socket that is attached to an output shaft of a nut runner as a member for transmitting a tightening torque of a bolt or a nut. The socket body, which is formed with a concave portion, is loosely fitted and supported via a pin so that it can be swung, and a conical concave support surface facing the end surface of the output shaft is attached to the axial center of the socket body. The present invention provides a compliance socket for a nut runner, which is formed, supports a steel ball on the supporting surface, and disposes a compression spring between the steel ball and the end surface of the output shaft.

[0006]

[Action]

 In the socket of the present invention, since the steel ball is constantly pressed against the conical concave support surface of the socket by the compression spring, if the socket axis is displaced or tilted with respect to the output shaft of the nut runner, the steel ball will be supported. By pressing the inclined surface away from the center of the surface, this pressing force generates a component force in the direction perpendicular to the socket axis, and this component force restores the displacement and inclination of the socket and the socket axis line. Is aligned with the axis of the output shaft.

[0007]

【Example】

 A specific example of the device of the present invention will be described below with reference to FIG. In the following description, the same constituent members as those in FIG. 2 showing the prior art are denoted by the same reference numerals, and the description of the overlapping matters will be omitted.

As shown in FIG. 1, a fixing pin 3 extending along the diametrical direction is attached near the tip of the output shaft 2A of the nut runner 10. The fixing pin 3 is used as a support member and the bolt head 1 is attached to the work-side tip. The cylindrical socket 4 formed with the fitting recess 7 is loosely fitted and supported so as to be swingable. The socket 4 has a bottomed structure including a conical steel ball supporting surface 5A and an equal diameter hole 5B extending from the maximum diameter portion of the steel ball supporting surface 5A toward the output shaft 2A. A shaft hole 9 is bored and a steel ball 8 and a compression spring 6 are fitted in the shaft hole 9 to form a self-aligning means between the socket 4 and the compression spring 6.

The socket 4 is configured as described above, and after the head 1 of the bolt is fitted into the recess 7 at the tip of the socket 4, the motor 2 is started to tighten the bolt. After that, when the socket 4 and the output shaft 2A are displaced from each other when the socket 4 is separated from the bolt head 1, the steel ball 8 is slightly displaced from the center of the conical support surface 5A by the pressing force of the compression spring 6. Since the position is pressed, a radial moving force is applied to the socket 4 and the socket 4 and the output shaft 2A are aligned on the same axis. Since the self-aligning action as described above occurs between the socket 4 and the compression spring 8, the output shaft 2A and the socket 4 are coaxially arranged, and when the bolt head 1 is tightened next, the socket 4 is There is no whirling and the tightening torque is reliably transmitted without damaging the bolt head 1.

[0010]

[Effect of the device]

 In the present invention, since the steel ball is pressed against the conical concave support surface of the socket by the compression spring, the axis of the socket can be surely aligned with the axis of the output shaft of the nut runner. This will prevent damage to the bolts and nuts due to whirling of the socket, allowing for reliable tightening work.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a nut runner socket according to the present invention.

FIG. 2 is a vertical sectional view of a conventional socket.

[Explanation of symbols]

 1 Bolt head (or nut) 2 Motor 2A Output shaft 3 Fixing pin 4 Socket body 5A Support surface 6 Compression spring 7 Recess for bolt head or nut fitting 8 Steel ball 10 Nut runner

Claims (1)

[Scope of utility model registration request] 1. A compliance socket mounted on an output shaft of a nut runner as a bolt or nut tightening torque transmitting member, wherein a nut for fitting a bolt head or a nut is formed at the tip of the output shaft of the nut runner. Socket body,
While supporting loosely swingably via a pin, at the axial center portion of the socket body, a conical concave support surface facing the end surface of the output shaft is formed, and the steel ball is supported by the support surface,
A compliance socket for a nut runner, comprising a compression spring arranged between the steel ball and the end surface of the output shaft.