JPS59196171A - Nut runner with torque detector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a nut runner equipped with a torque detection device for detecting tightening torque.

<Prior art> A two-trunner equipped with a conventional torque detection device has a cylindrical runner main body with a small-diameter thin part formed in accordance with the tightening torque at the lower end, and a fixing part below the thin part. The nut runner shaft is rotatably supported on the nut runner body through a hair ring, and the nut runner body is equipped with a reduction mechanism using planetary gears that connects with the nut runner shaft. The drive morph for rotationally driving the shaft was fixed to the upper part of the nut runner body, and the strain sensor was fixed to the thin part of the nut runner body. Torque of a nut, etc. is detected by a strain sensor using a reaction force against the force of the drive motor to tighten the nut, or by twisting the thin part of the nut runner to rotate the nut runner body via the nut runner shaft. It was becoming like this.

In this way, since a thin wall part is provided in a part of the nut runner body so that torque can be detected when tightening the NAND, etc., the support rigidity of the thin wall part is sufficient to support the weight of the drive motor, etc. above the thin wall part. However, there was a problem in that the area above the thin wall part was unstable.

<Object of the Invention> To solve the above-mentioned problems (the object of the present invention is to enable the tightening torque of a nut runner, etc. to be detected without providing a thin-walled part for detecting tightening torque, and to prevent the nut runner from wobbling. The goal is to create a support structure that does not require

<Configuration of the Invention> A nut runner equipped with a torque detection device according to the present invention has the following features:
The support part fixed to the fixed part supports the Ninaso runner body through a plurality of bear links so that it can only rotate, and the Natsu runner shaft, which is rotationally driven by a drive motor fixed to the Natsu runner body, is supported on the Natsu runner body. A flexible member is connected to the support member, and a strain sensor is provided to detect the deflection of the flexible member by the reaction force acting on the nut runner body.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a fixed part, and a cylindrical support member 2 is fixed to this fixed part 1 at its lower end.

is supported by It is only possible to rotate around the same axis as the nut runner body 3. - The throat runner '@6 is supported by the nut runner body 3 via a plurality of bearings 7, 8, 9, and the drive motor 0 is fixed to the upper part of the nut runner body 3. . A gear 12a is formed on a rotating shaft 12 that is spline-coupled to the output shaft 11 of the drive motor 0, and a plurality of planetary gears 13 that mesh with the gear 12a are pivotally supported by the nut runner shaft 6 and mesh with the planetary gears 13. A fixed gear 14 is formed on the inner periphery of the nut runner body 3. Output shaft 11
The rotation causes the planetary gear 13 to revolve around the output shaft 11 while rotating, thereby transmitting the reduced rotational power to the nut runner shaft 6. A shaft member 15 is connected to the lower end of the nut runner shaft 6 with a spline connection for transmitting shaft motion and rotational power, and a socket 17 into which a nut or the like is fitted is removably fixed at the lower end of the shaft member 15.

A pressing cavity 16 for pressing the shaft member 15 is built in between the nut runner shaft 6 and the shaft member 15.

Next, the first. The torque detection device will be explained based on FIG. A through hole 1 is provided in the radial direction approximately in the middle of the support member 2.
8 is formed, and an engagement groove 19 is formed in the nut runner main body 3 at a position corresponding to the through hole 18. Bending part +A
20 is fixed to the support member 2 at a position where one end of the bent portion 20 engages with the engagement A19. Strain sensors 23 are fixed to the front and rear of the bending member 20.

In this way, the nut runner body 3 is prevented from rotating by the bending member 20, and when a large rotational force is generated in the nut runner body 3, the support member 2 and the nut runner body are arranged so that the bending member 20 is bent very slightly in the direction of rotation of the nut runner body 3. 3, and the strain sensor 23 detects the tightening torque of Nand etc. By removing the cap 22, the bending member 20 can be easily replaced, and by replacing the bending member 20, it is also possible to detect large and small tightening.

Based on the above-mentioned configuration, the tightening operation of Nand etc. and the tightening torque detection operation will be explained. Output shaft 11
At zero rotation, the planetary gear 13 is meshed with the fixed gear 14 and revolves through the rotating shaft 1-2, and the socket 1-17 rotates through the nut runner shaft 6 and the shaft moving member 15, and the socket 1
The hoofing of Nando, etc., fitted to 7 is performed. A reaction force against the force of the drive motor 10 to rotate the socket 17 is transmitted to the nut runner main body 3 via the shaft member 15, the nut runner shaft 6, and the planetary gear 13, and the nut runner main body 3 bends the bending member 20. Rotate against 2. By bending the bent surface material 20, the strain sensor 2
3, the tightening torque of Nand etc. is detected, and when the torque reaches a set value, the drive morph 10 stops. Even if the bending member 20 is fixed to the nut runner main body 3 and one end of the bending member 20 is engaged with an engagement groove formed in the cap 22, the tightening torque of a nand etc. can be similarly detected.

In the above-mentioned embodiment, relative rotation occurs between the support member 2 and the naso trunner main body 3, and the bending member 20 is bent, so that torque is detected for tightening the Nand, etc. However, as other embodiments, As shown in FIG. 3, both ends of the compression/tension member 30 are fixed to the support member 2', the center thereof is fixed to the nut runner main body 3', and a plurality of strain sensors 31 are fixed to the compression/tension member 30. 3' and the nutrunner body 3'.
By tensile and compressing the material, the tightening torque of the Nand etc. may be detected.

As mentioned above, when tightening a nut runner, the torque is detected by detecting the slight deflection of the bending member or compression/tension member. do not have. For this reason, the above-mentioned torque detection device can also be used for an offset type nut runner in which the nut runner shaft to which the socket is fixed is eccentric from the axis of the nut runner body so that the plurality of Nano 1 to runners do not interfere with each other.

<Effects of the Invention> As described above, in the present invention, the drive motor is fixed and the nano 1-runner main body, which supports the nut runner shaft which is rotationally driven by the drive motor, can only be rotated through a plurality of bearings. Since the nut runner is supported by a support member fixed to the fixed part, there is no fear that the nut runner will wobble. Furthermore, the nut runner can be made more compact by interposing a flexible member between the support member and the nut runner body and providing a strain sensor for detecting deflection of the flexible member.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is an overall cross-sectional view of the nut runner, and Fig. 2 shows the parts shown in Fig. 1.
A cross-sectional view taken along a line, and FIG. 3 is a diagram showing an example using another torque detection device. 2... Support member, 3... Nano 1 to runner body, 4.
5...Bearing, 6...Nut runner shaft, 10.
- Drive motor, 2o - Self-bending member, 22... Cap, 23... Strain sensor. Patent applicant Toyota Machinery Co., Ltd.

Claims (1)

[Claims] (1) A support member fixed to a fixed part, a nut runner main body which is rotatably supported through a plurality of hair rings through the support part shrine, a drive motor fixed to the nut runner main body, No. 1 - A nut runner shaft rotatably supported by a runner body and rotationally driven by a drive motor, a flexible part that connects the nut runner body and a support member and is deflected by a reaction force acting on the nut runner body, and a flexible part lever. A nut runner equipped with a torque detection device consisting of a strain sensor that detects deflection.