JPH034825Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to a spring compression amount indicating mechanism in a torque limiter that prevents the excessive load from being transmitted to the input member when an excessive load is applied to the output member. It is.

<Prior art> The amount of spring compression in a conventional torque limiter can be confirmed by measuring the position of the torque adjusting ring with a ruler or by measuring the position of the torque adjusting ring with reference to when the end face of the torque adjusting ring is on the same plane as the end face of the input member, or by measuring the position of the torque adjusting ring using a ruler. This can be done by checking the amount of tightening of the torque adjustment ring by reading the number of threads visible on the outer circumference of the end of the adjustment ring tightening screw, or by counting the number of times the adjustment ring is rotated. ing.

<Problems to be solved by the invention> In the conventional method of checking the amount of spring compression in a torque limiter as described above, if the torque limiter is installed at the back of the machine, it is necessary to rotate the torque adjustment ring. Therefore, it is difficult to measure with a ruler or read the number of threads on a screw, and after rotating the torque adjustment ring to the reference surface and returning it, rotate the adjustment ring again to tighten it. Work such as counting the number of revolutions is extremely difficult and time-consuming work.

<Means for solving the problem> This invention was made in order to solve the above problems.A part of the outer periphery of the spring receiving ring of the torque limiter is provided with a shaft from the end facing the ring adjustment ring. A groove of a predetermined length is formed in the direction, an indicating member is slidably inserted into the groove, the indicating member is made to protrude from the end of the groove, and a spring is attached to the groove to slidably press the indicating member against the torque adjustment ring. Furthermore, a scale indicating the position of the index provided on the indicating member is provided in a portion adjacent to the groove of the spring receiving ring.

<Operation> This invention has the above structure, and when the torque adjustment ring is rotated with respect to the input member, the instruction member provided on the spring receiving side moves forward and backward together with the torque adjustment ring.

Therefore, the desired torque can be obtained by reading the scale on the spring receiving side indicated by the indicator on the indicating member and moving the torque adjustment ring until the value reaches the desired value.

<Example> Next, an example of this invention will be described based on the accompanying drawings.

1 is a cylindrical input member with a collar 2 on the outer periphery of one end.
A plurality of tapered recessed holes 3 are provided inside the collar 2 on a circumference concentric with the member 1.

Reference numeral 4 denotes an output member rotatably mounted on the outer circumference of the input member 1 in contact with the collar 2, and this member 4 has holes 5 in the axial direction formed at positions corresponding to the respective recessed holes 3. There is.

Reference numeral 6 denotes a power transmission member, and in the embodiment, two balls are loosely fitted into each hole 5. Reference numeral 7 denotes a spring receiving ring, and the ring 7 and the input member 1 are fitted together by a slide key 8 so as to rotate together and freely slide in the axial direction.

Reference numeral 8' denotes a male thread formed on the outer periphery of the other end of the input member 1, and a female thread inside the torque adjustment ring 9 is screwed into this male thread.

Before screwing the torque adjustment ring 9 onto the male screw 8', coil springs 11 are fitted into the plurality of concave springs 10 provided in the spring receiving ring 7, and the outer ends of the springs 11 are After fitting the protrusions 13 of the locking ring 12 to the inside of the torque adjustment ring 9 and completing the torque adjustment of the torque limiter, the protrusions 14 on the outside of the ring 12 are fitted to the predetermined positions. into the notch 15 on the outer periphery of the torque adjustment ring 9.

Further, a ring-shaped protrusion 1 is provided on the inner periphery of the surface of the torque adjusting ring 9 that is in contact with the locking ring 12.
6 are integrally formed so that the inner periphery of the locking ring 12 fits into the ring-shaped protrusion 16 and becomes concentric.

Spring receiving ring 7 that rotates together with the input member 1
An axial groove 18 having a predetermined length from the end on the adjusting ring side is formed in a part of the outer periphery of the ring.

This groove is in the shape of a round hole as shown in FIG. 4, and by forming a planar scale part 19 reaching the round hole on the outer periphery of the ring 7 in this part, the groove 18 is made wider on the inside. be.

Reference numeral 20 denotes a round rod-shaped indicator member slidably inserted into the groove 18. A push spring 21 is attached between the concave hole at the inner end of this member 20 and the inner end of the groove 18.
The outer end of the locking ring 12 is slidably brought into contact with a locking ring 12 adjacent to the torque adjusting ring 9.

Further, on a part of the outer periphery of the indicating member 20, an indicator 22 is provided.
The scale portion 19 is provided with a scale 23 indicated by the indicator 22.

In the above embodiment, when the input member 1 rotates, the power transmission member 6 fitted into the recessed hole 3 of the collar 1, which is integral with the input member 1, rotates together with the output member 4. When the load applied to the output member 4 is normal, the transmission member 6 is deeply inserted into the recessed hole 3 due to the pressure of the spring bearing ring 7 pressed by the coil spring 11, so the torque of the input member 1 is directly transferred to the output member 4.
It is reported that.

However, if an excessive load is applied to the output member 4,
A braking force acts on the rotation, making it difficult for the output member 4 to rotate, but the input member 1 tries to continue rotating, so the transmission member 6 is pushed out of the concave hole 3 of the collar 2, and the pressure ring 7 is pressed against the spring. Compress 11 and retreat.

Then, the action of fitting the member 6 into the next recessed hole 3 is repeated.

To adjust the torque in the above torque limiter, rotate the torque adjustment ring 9 and move the ring 9 forward and backward with respect to the input member 1 along the male helix 8' to change the distance between the torque adjustment ring 9 and the spring bearing ring 7. At this time, the instruction member 20 as well as the torque adjustment ring 9 is attached to the spring receiving ring 7.
advance and retreat against

Therefore, by looking at the scale 23 indicated by the indicator 22 of the indicating member 20, the amount of compression of the spring 11 can be clearly determined, so that the set torque can be determined from the amount of compression of the spring 11.

For example, the state in FIG. 2 shows a state in which the torque adjustment ring 9 approaches the spring receiver ring 7, increasing the set torque, and the state in FIG. 3 shows the state in which the torque setting ring 9 moves away from the spring receiver ring 7. This shows a state in which the set torque is becoming smaller.

It should be noted that the torque limiter shown in the embodiment is merely an example, and the present invention can be applied to torque limiters other than the illustrated example.

<Effects of the invention> As described above, this invention connects the input member and the output member with a power transmission member using the pressing force of the spring elasticity, and includes a torque adjustment ring that adjusts the pressing force of the spring. In the torque limiter screwed onto the outer periphery of the end of the input member, the instruction member is attached to any position of the spring receiving ring on the spring receiving side so that it can move forward and backward, and the torque adjustment ring is rotated to move it forward and backward with respect to the input member. Since the position can be accurately determined by the scale on the spring receiving side indicated by the indicator on the indicating member, it is extremely easy to adjust the torque.
It has excellent effects such as being able to adjust torque in narrow spaces.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view showing an embodiment of this invention;
2 and 3 are partially cutaway bottom views showing each state of the same as above, and FIG. 4 is a partially cutaway cross-sectional front view taken along line A--A in FIG. 1. DESCRIPTION OF SYMBOLS 1...Input member, 4...Output member, 6...Power transmission member, 7...Spring receiving ring, 9...Torque adjustment ring, 11...Spring, 18...Groove, 19...
...Flat scale part, 20... Indication member, 21...
Spring, 22...index, 23...scale.

Claims (1)

[Scope of utility model registration request] In a torque limiter, an input member and an output member are connected by a power transmission member using a pressing force due to the elasticity of a spring, and a torque adjustment ring for adjusting the pressing force of the spring is screwed onto the outer periphery of an end of the input member. , a groove of a predetermined length is formed in a part of the outer periphery of the spring receiving ring in the axial direction from the end facing the torque adjustment ring, and an indicating member is slidably inserted into the groove; A spring is installed that protrudes from the end of the groove and is slidably pressed against the torque adjustment ring, and a scale indicating the position of the index provided on the indicating member is provided in a portion of the spring receiving ring adjacent to the groove. Features a spring compression amount indicating mechanism in the torque limiter.