JPH04262124A - Torque limiter - Google Patents

Abstract

PURPOSE:To change rotational torques from each other in both-directional rotations either normal or reverse by providing a square spring coil in the direction for winding around the external circumferential part of a friction plate which is fixed to the external circumferential part of an output hub disc part and grasped between an input hub flange part and an input plate and for tightening the friction plate. CONSTITUTION:A single plate type torque limiter is provided with an input hub 11 which is composed of a hub 11a and a flange part 11b, and an input plate 12 which is so arranged as to be opposite to the flange part 11b. It is also provided with an output hub 13 which is composed of a hub part 13a and a disc part 13b, and a friction plate 14 which is fixed to the external circumference of the disc pat 13b. In addition, the friction plate 14 is grasped between the flange part 11b of he input hub 11 and the input plate 12, and the pushingly pressing force is adjusted by means of a compression spring 16 wound around an adjusting bolt 15. In this constitution, a square spring coil 17 whose inner diameter is formed smaller than the outer diameter of the friction plate 14 is wound in the direction for winding around the external circumference of the friction plate 14 and to tightening the friction plate 14.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque limiter, and more particularly to an improvement in a torque limiter used for opening and closing electric valves, attaching and detaching screws, etc.

0002

2. Description of the Related Art Conventional torque limiters used for opening and closing electric valves, attaching and detaching screws, etc. have a structure as shown in FIG. 3, for example. an input hub 1 consisting of an input hub 1, an input plate 2 disposed to face the flange portion 1b of the input hub 1, an output hub 3 consisting of a hub portion 3a and a disk portion 3b, and a disk portion of the output hub 3. 3b, the friction plate 4 is held between the flange portion 1b of the input hub 1 and the input plate 2, and the friction plate 4 is sandwiched between the flange portion 1b of the input hub 1 and the input plate 2. The adjustment bolt 5 attached to connect the adjustment bolt 5 can adjust the pressing force against the flange 1b of the input hub 1 and the friction plate 4 of the input plate 2 by a compression spring 6 wound around the head and neck of the adjustment bolt 5. has been made into
The force of the compression spring 6 acts on the friction plate 4 held between the flange portion 1 of the input hub 1 and the input plate 2, thereby transmitting torque. Such a torque limiter can transmit a predetermined torque by adjusting the force of the compression spring 6, but the rotational torque transmitted from the input hub 1 to the output hub 3 when rotating in one direction is the same as the rotational torque when rotating in the other direction. Become.

0003

[Problems to be Solved by the Invention] In general, electric valves use a motor with a reduction gear to open and close the valve, but if a torque limiter is not used when closing the valve, excessive torque will be generated and damage the valve. Resulting in. Also, when opening a valve, with a conventional torque limiter as shown in Figure 3, the rotational torque when opening and closing the valve is the same, so the torque limiter slips and cannot be opened, so a torque larger than that of the torque limiter is required. Is required. In other words, when opening and closing a valve, similar to opening and closing a screw, the rotational torque in the "opening direction" must be considerably higher than the rotational torque in the "closing direction," so conventional torque limiters cannot be used. Therefore, a torque limiter that has different rotational torques when the valve is opened and when the valve is closed, that is, a torque limiter that has different rotational torques when the valve is rotated in one direction and when it is rotated in the other direction, has become necessary.

0004

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The first invention is
This relates to a single-plate torque limiter that is relatively small and capable of transmitting low rotational torque, and includes an input hub consisting of a hub part and a flange part, and arranged to face the flange part of the input hub. The output hub includes an input plate, an output hub including a hub portion and a disk portion, and a friction plate fixed to the outer circumference of the disk portion of the output hub, and the friction plate has a flange portion of the input hub and the input plate. The adjustment bolt, which is sandwiched between the input hub and the input plate, is attached to the flange of the input hub by a compression spring wound under the head of the adjustment bolt. and a rectangular spring coil having an inner diameter smaller than the outer diameter of the friction plate has one end fixed to the flange portion of the input hub or the input plate, and the pressing force of the input plate against the friction plate can be adjusted. The friction plate is fitted so as to surround the outer periphery of the friction plate, and its winding direction is set in a direction that tightens the friction plate when rotating in one direction, thereby reducing the rotational torque transmitted from the input hub to the output hub during rotation in the one direction. It is an object of the present invention to provide a torque limiter that can increase the rotational torque when rotating in the other direction.

[0005]The second invention relates to a multi-plate torque limiter that is relatively small and capable of transmitting high rotational torque, and includes an input hub consisting of a hub portion and a flange portion, and a flange of the input hub. an input plate disposed to face the input hub; one or more outer discs interposed between the flange of the input hub and the input plate; an output hub consisting of an inner disk; and one or more friction plates fixed to a disk portion of the output hub and an outer circumferential portion of one or more inner disks, the friction plates being attached to a flange portion of the input hub. and the input plate, the input hub is alternately sandwiched between the one or more outer disks, and is attached to connect the flange portion of the input hub, the one or more outer disks, and the input plate. The adjustment bolt can adjust the pressing force against the friction plate of the flange of the input hub, the outer disk, and the input plate by a compression spring wound under the head and neck of the adjustment bolt. One or more square spring coils having an inner diameter smaller than the diameter are fixed at one end to the flange of the input hub, the outer disk, or the input plate, and are fitted so as to surround the outer periphery of the friction plate. The direction is such that the friction plate is tightened when rotating in one direction, thereby increasing the rotational torque transmitted from the input hub to the output hub when rotating in the one direction compared to the rotational torque when rotating in the other direction. This is an attempt to provide a torque limiter that allows for

[0006]

[Operation] The torque limiter according to the present invention is intended to apply the operating principle of the overrunning type wrap spring clutch shown in FIG. The basic structure of this wrap spring consists of three basic parts on a common shaft: an input hub 5, a square spring coil 6 and an output hub 7. When the input hub 5 is rotated in the same direction as the winding direction of the square spring coil 6, the square spring coil 6 tightens the output hub 7 while transmitting torque.
rotates in the opposite direction to the winding direction of the square spring coil 6, the square spring coil 6 releases its clamping force and loosens the output hub 7. The only control of this type is to activate and deactivate the input hub 5 by means of the other coupling mechanism. Also, when the input hub 5 is reversed, the square spring coil 6
The winding direction is opposite to that of the winding direction, and no tightening force is generated.

The torque limiter according to the present invention basically has an output hub, similar to the wrap spring clutch shown in FIG.
It includes a square spring coil and an output hub, and a friction plate is fixed to the outer periphery of the disc part of the output hub, and the square spring coil is fitted around the outer periphery of the friction plate to transmit information from the input hub to the output hub. The rotational torques generated are different during forward and reverse rotations.

[0008]

Embodiments Hereinafter, embodiments of the torque limiter according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a first embodiment corresponding to the first invention, and FIG. 2 shows a second embodiment corresponding to the second invention. First, a first embodiment of the torque limiter shown in FIG. 1 will be described.

First, the single-plate torque limiter of the first embodiment shown in FIG.
an input plate 12 disposed to face b, an output hub 13 consisting of a hub portion 13a and a disk portion 13b;
and a friction plate 14 fixed to the outer periphery of the disk portion 13b of the output hub 13. The friction plate 14 is held between the flange portion 11b of the input hub 11 and the input plate 12, and Flange portion 11b and input plate 12
The adjustment bolt 15 attached to connect the adjustment bolt can adjust the pressing force against the flange portion 11b of the input hub 11 and the friction plate 14 of the input plate 12 by a compression spring 16 wound around the head and neck of the adjustment bolt. is being used.

The above configuration is substantially similar to the conventional torque limiter shown in FIG. 3, but a square spring coil 17 is newly provided in the first embodiment. That is, the square spring coil 17 is formed to have an inner diameter smaller than the outer diameter of the friction plate 14, and one end is fixed to the flange portion 11b of the input hub 11 or the input plate 12 (input plate 12 in this embodiment), and It is fitted around the outer circumference of the plate 14, and its winding direction is such that it tightens the friction plate 14 when rotating in one direction, thereby increasing the rotational torque transmitted from the input hub to the output hub when rotating in one direction. The rotation torque can be increased compared to the rotation torque in the other direction.

Next, regarding the multi-plate torque limiter of the second embodiment shown in FIG. 2, parts common to the first embodiment shown in FIG. 1 are given the same reference numerals, and parts different from the first embodiment will be explained. do.

In the first embodiment, the output hub 1
In the second embodiment, the friction plate 14 fixed to the outer periphery of one of the disk parts 13b of the third embodiment was sandwiched between the flange part 11b of the input hub 11 and the input plate 12. , one disk part 1 of the output hub 13
3b and one or more friction plates 14 fixed to the outer periphery of one or more inner disks 13c are arranged alternately between the flange portion 11b of the input hub 11 and the input plate 12 via the one or more outer disks 11c. One or more square spring coils 17 are selectively fitted to the outer periphery of one or more friction plates 14, and the number of square spring coils 17 can be determined as required depending on the magnitude of the transmitted torque. Can be done. The inner circumferential portion of the inner disk 13c is spline-coupled to the outer circumferential portion of the hub portion 13a of the output hub 13. Second
The operation of the torque limiter of this embodiment is substantially similar to that of the first embodiment.

[0013]

[Effects of the Invention] Since the torque limiter according to the present invention is constructed as described above, it has the following effects. (2) A torque limiter can be used in which the rotational torques transmitted from the input hub to the output hub differ from each other when rotating in one direction and when rotating in the other direction. ■If a relatively small size and high transmission torque is required, a multi-plate torque limiter can be used.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a first embodiment of a torque limiter according to the present invention.

FIG. 2 is a longitudinal cross-sectional side view of the upper half of a second embodiment of the torque limiter according to the present invention.

FIG. 3 is a longitudinal side view of a conventional torque limiter.

FIG. 4 is a side view of the basic structure of a wrap spring clutch.

[Explanation of symbols]

11 Input hub 11a Hub part 11b Flange part 11c outer disc 12 Input plate 13 Output hub 13a Hub part 13b Disk part 13c inner disc 14 Friction plate 15 Adjustment bolt 16 Compression spring 17 Square spring coil

Claims (2)

[Claims] [Claim 1] A single-plate torque limiter, comprising:
an input hub comprising a hub portion and a flange portion; an input plate disposed to face the flange portion of the input hub; an output hub comprising a hub portion and a disk portion; and a disk portion of the output hub. a friction plate fixed to an outer peripheral portion, the friction plate being sandwiched between the flange portion of the input hub and the input plate so as to connect the flange portion of the input hub and the input plate. The attached adjustment bolt can adjust the pressing force against the flange of the input hub and the friction plate of the input plate by a compression spring wound under the head and neck of the adjustment bolt, and the outer diameter of the friction plate can be adjusted. A square spring coil with a smaller inner diameter has one end fixed to the flange of the input hub or the input plate, and is fitted so as to surround the outer periphery of the friction plate, so that the winding direction of the coil is fixed when the friction plate rotates in one direction. is tightened, thereby making it possible to increase the rotational torque transmitted from the input hub to the output hub when rotating in one direction compared to the rotational torque when rotating in the other direction. Features a torque limiter. [Claim 2] A multi-plate torque limiter, comprising:
An input hub including a hub portion and a flange portion, an input plate disposed to face the flange portion of the input hub, and an input hub interposed between the flange portion of the input hub and the input plate. an output hub consisting of two or more outer disks, a hub part, a disk part, and one or more inner disks; a friction plate, the friction plate is alternately sandwiched between the flange portion of the input hub and the input plate via the one or more outer disks, and the friction plate is sandwiched between the flange portion of the input hub and the one or more outer disks. The adjustment bolt attached to connect the outer disk and the input plate is connected to the flange of the input hub, the outer disk, and the input plate by a compression spring wrapped around the head and neck of the adjustment bolt. One or more rectangular spring coils having an inner diameter smaller than the outer diameter of the friction plate, the pressing force of which can be adjusted against the friction plate, have one end attached to the flange of the input hub, the outer disk, or the input plate. It is fixed and fitted so as to surround the outer periphery of the friction plate, and its winding direction is set in a direction that tightens the friction plate when rotating in one direction, thereby transmitting information from the input hub to the output hub during rotation in the one direction. A torque limiter characterized in that the rotational torque can be made larger than the rotational torque when rotating in the other direction.