JPH0297724A - Torque limiter - Google Patents

Abstract

(57) [Abstract] 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 torque limiter that cancels torque transmission when a load exceeds a set value when transmitting torque from one member to another member. It is something.

(Prior art) There are devices for controlling torque transmission that manage S friction.
The inventions described in No. 524 and No. 51-22135 are publicly known.

<Technical Issues> The torque control device as described above causes FiJ friction between the input side member and the output side member (in some cases, there is a shallow uneven engagement).
The structure is such that the transmittable torque is managed by connecting the two and causing slippage at a set value.

However, with torque management using friction, it is difficult to change or adjust the torque once set. ? ! Due to variations in the degree of machining of the i-plane and variations in frictional resistance, it is difficult to maintain a constant set value, and in particular, there are problems in that precise torque management is difficult.

The purpose of the present invention is to solve the above-mentioned problems, make it easy to adjust the 1-herc setting value, and absorb variations in machining accuracy and frictional resistance even when manufactured with the same precision as before. An object of the present invention is to provide a torque limiter capable of highly accurate torque management.

(technical means) The purpose is to rotate the input member and output member around one axis.

a friction plate protruding in the radial direction on one of the members, and a pair of spring receivers arranged at a required distance from the friction plate on both sides of the friction plate in the axial direction; A rolling element made of a plurality of trochanters capable of rolling around an axis is arranged on both sides of the friction plate, and the rolling element is pressed against the friction plate between the rolling element and the pair of spring bearings. This can be achieved by interposing a pair of pressurizing springs.

(Example) A description will be given below with reference to the drawings. In each figure, 10 degrees is an input member, 20 is an output member, and both members are combined so as to be rotatable around one axis. The illustrated input member 10 has a hollow tubular shaft portion 11, and a circular flange-shaped friction plate 12 projecting radially outward is integrally provided in the intermediate portion thereof.

13.13' is a rolling element formed in the shape of a disk approximately the same size as the friction plate 12, 14.14' is a through hole formed in the center of these, and the rolling element has a play of 1. be done. 15.
Reference numeral 15' denotes a needle roller-shaped trochanter, which is arranged so as to be in pressure contact with both surfaces of the friction plate 12. Therefore, the rolling element 13
．． At least three or more radial holding grooves 16.16' are formed radially on the side surface facing the FJ friction plate 12 of 13', and each trochanter 15.15' can be rotated around an axis (circumferential direction). I'm holding onto it as much as possible. 17.17' is each rolling element 13
．． A protrusion protruding from the outer periphery of the output member 13' engages with a guide groove 18 formed on the inner surface of the output member 20.

The output member 20 is formed into a cylindrical shape and has one end closed to form one spring receiver 21 . The other end is an opening 20a, and the other spring receiver 22 having a male thread 20c screwed into a female thread 20b inside the opening 20a is attached. 23
．． 23' is a shaft hole into which the input member shaft portion 11 is fitted;
Therefore, the spring bearings 21 and 22 also serve as bearings for the input member 10.

The pair of pressure springs 25.25' have a coil shape and are interposed between the left and right rolling elements 13.13' and the spring receivers 21.22. These springs 25, 25' change their length by moving the other spring bearing 22 in the axial direction, changing the spring acting force, and increasing the force with which the trochanter 15, 15' comes into pressure contact with each surface of the friction plate 12. can be adjusted. In each figure, 2G, 26'
is the spring receiving groove provided in the rolling element 13.13', 27.2
7 is the spring receiving groove provided in the spring receiver 21, 22, 28 is the shaft portion 1
The key groove provided at 1 and 29 are key holes.

In the above configuration, the input member 10 has f! Although only the example in which the J friction plate 12 is provided has been described, it is also possible to provide the output member 20 with a friction plate on the contrary, and in that case, it is possible to obtain exactly the same effect as in the above embodiment. Other changes such as simplification or expansion of the structure may also be made.

(Function) FIG. 2 is a longitudinal cross-sectional view of the embodiment. If the input member 10 is now rotated, the trochanters 15 and 15' disposed on each side of the diaphragm 12 are springs 25 and 15, respectively. 25, the rotational force is transmitted as long as it is within the set torque, and the output member 20 as a whole rotates as the friction wA root 12 rotates. In other words, at a torque within the set range, the input member 1
0 rotation can be transmitted to the output member 20.

In the above case, since the input member 10 having the friction plate 12 has pressure springs 25, 25' acting on both sides through the trochanter 15, 15', the springs 25, 25' are balanced with the same pressure, Even if there is variation in pressurization accuracy on the trochanter contact surface of the friction plate 12, this is absorbed and the torque setting value remains constant.

Also, one spring receiver 22 is threadedly engaged with the output member 20 at a threaded portion, and when moved in the axial direction, the pressure spring 25.25'
Since the contraction ratio of the trochanter can be changed, the trochanter 15.15'
The pressure contact force also changes, and the torque is adjusted.

A needle roller-shaped trochanter normally transmits torque by generating a certain amount of sliding friction with a friction plate. But I! If there is abnormal frictional resistance between the Im plate 12 and the trochanter 15.15', the trochanter 15.15'
′ rotates. Therefore, in the present invention, the trochanter double acts as a limiter to prevent torque transmission.

(Effects/Effects) The present invention is constructed and operates as described above, and as a result, exhibits numerous effects.

■The torque setting value can be easily adjusted.

■Since the springs that apply pressure to the friction plate from both sides via the trochanter are balanced with the same pressure, even if there are variations in processing accuracy or frictional resistance, these are absorbed and a constant torque setting value can be obtained.

■Also, due to the same reason as ■, the fluctuation in torque rise is very small.

■The structure is simple and there is very little variation between 1 and 1 lux.

(2) The shape of the component parts is simple, the number of parts is small, and there are many common parts, so it is easy to manufacture despite its high performance, and the cost can therefore be kept low.

[Brief explanation of the drawing]

The drawings show an embodiment of the torque limiter of the present invention, and FIG. 1 is an exploded perspective view, FIG. 2 is a vertical sectional view, and FIG. 3 is a second
It is a sectional view taken along the line A-A. 10...Input member, 12...wm board, 13.13'
...Rolling element, 15.15'... Trochanter, 20...
Output member, 21.22... Spring receiver, 25.25'...
・Pressure spring. Patent applicant

Claims (3)

[Claims] (1) An input member and an output member are arranged close to each other so as to be rotatable around one axis, and one of the members is provided with a friction plate that protrudes in the radial direction, and a required distance is provided from the friction plate to both sides in the axial direction. A pair of spring receivers arranged apart from each other are provided on one of the other members, and rolling elements each consisting of a plurality of trochanters capable of rolling around an axis are arranged on both sides of the friction plate, and the rolling elements and the pair of spring receivers are arranged on both sides of the friction plate. Torque limiter with a pair of pressure springs interposed between the spring receiver and the rolling element to press against the friction plate. (2) The torque limiter according to claim 1, wherein at least one of the pair of spring bearings is movable in the axial direction, thereby adjusting the pressing force of the rolling elements. (3) The torque limiter according to claim 1 or 2, wherein the rolling element is movable in the axial direction but engaged with either the input member or the output member so as not to rotate around the axis. .