JPS59507Y2 - electromagnetic spring clutch - Google Patents

Description

[Detailed description of the invention] This invention is an electromagnetic spring clutch/brake (hereinafter referred to as a spring clutch).

), more specifically, improving response performance,
The present invention also relates to a spring clutch that can also have a delay function if necessary.

In Japanese Patent Application No. 51-130249 (see Japanese Unexamined Patent Application Publication No. 53-54647) filed on October 28, 1975, the applicant of the present application describes a coiled spring connecting an input hub portion and an armature portion. We have proposed a spring clutch characterized by having a mechanism for pre-shrinking the spring to a necessary inner diameter and maintaining this state.

In the embodiment of Japanese Patent Application No. 130249/1980, a pin fixed to the armature is pressed by the side surface of a preload plate which can be fixed to the sprocket of the input hub as appropriate, and the manual hub and the armature are moved relative to each other. This configuration allows the preload plate to be fixed to the sprocket at a desired position by appropriately displacing the position.

Therefore, the spring clutch contracts the coiled spring in advance to such an extent that it does not substantially contact the hub of the output shaft, maintains this state, and starts contracting the spring from this state when the electromagnetic coil is excited. Since it is possible to do this, it has the advantage that the responsiveness when connecting the driving side and the driven side can be greatly improved, and the state of contraction and relaxation of the coiled spring can be arbitrarily selected in advance. It has the advantage that it can also be used as a delay clutch.

However, in the above-described spring clutch, no consideration was given to responsiveness when the drive side and the driven side are disconnected.

Therefore, the applicant of this application filed Japanese Patent Application No. 51-139715 (Japanese Unexamined Patent Publication No. 53-641) filed on November 20, 1975.
(Refer to Publication No. 48), the connection between the driving side and the driven side
We have proposed a spring clutch characterized by having a mechanism for assisting the torsional moment of a coiled spring for release.

The embodiment of the above-mentioned Japanese Patent Application No. 139715/1980 rotates the armature by pressing a pin fixed to the armature with the first side of a preload plate which can be fixed to the sprocket of the input hub as appropriate. The relative positions of the input hub part and the armature part are appropriately displaced to fix the preload plate to the sprocket at a desired position, and furthermore, when the electromagnetic coil is not excited, the pin and the preload plate are fixed to the sprocket at a desired position. between the pin and the second side surface of the preload plate such that a force is applied in the direction in which the first side surface and the opposing second side surface of An auxiliary spring is inserted in the

Therefore, since the spring clutch is configured to use the repulsive force of the auxiliary spring to assist in loosening the coiled spring, it is possible to significantly improve responsiveness when disconnecting the driving side and the driven side. There are advantages.

However, on the other hand, the spring clutch has a disadvantage in that the contraction operation of the coiled spring is hindered to some extent by the auxiliary spring, resulting in poor responsiveness when the driving side and the driven side are connected.

Furthermore, since the range in which the repulsion function of the auxiliary spring is exerted is limited, the delay time cannot be widened, making it difficult to use the spring clutch as a delay clutch.

Therefore, the purpose of the present invention is to provide excellent responsiveness when connecting the driving side and driven side, and excellent responsiveness when disconnecting the driving side, and also to be able to be used as a delay clutch when necessary. The purpose of this invention is to provide a spring clutch that can be used.

In order to eliminate the above-mentioned drawbacks and achieve the above-mentioned objects, the present invention has been developed to connect and connect the driving side and the driven side by contracting and relaxing the coiled spring connecting the hub part and the armature part.
In the electromagnetic spring clutch for disengaging the connection, the hub portion has a preload plate, and the preload plate presses the armature portion to appropriately displace the relative position of the hub portion and the armature portion to adjust the hub portion to a desired position. The collar, which is fixed in position, forms the armature part, and has one end of the coiled spring locked therein, is rotatably supported by the hub part by a bearing.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, the spring clutch indicated by reference numeral 1 has a field portion 2, a rotor 3, an armature portion 4, and an input hub portion 5 arranged adjacent to each other in this order on an output shaft 6.

In the field section 2, an electromagnetic coil 8 is housed inside a yoke 7 made of a magnetic material and has a U-shaped cross section, and is pivotally supported by an output shaft 6 via a bearing receiver 9 and a bearing 10.11. The output shaft 6 is configured to be able to rotate freely relative to the field section 2, and is usually supported by a support frame (
(not shown) etc.

The rotor 3 provided adjacent to the field section 2 has a cylindrical first magnetic pole 12 that partially covers the yoke 7 of the field section 2, and a rotor 3 that is fitted inside the first magnetic pole 12. It consists of a non-magnetic ring 13 and a second magnetic pole 14 fitted inside the non-magnetic ring 13 and having a bored hole in the bottom of the convex side surface. A first auxiliary bearing 15 is fitted into the bored hole.

The second magnetic pole 14 is fixed to the output shaft 6, so that the rotor 3 can freely rotate relative to the field part 2.

The armature portion 4 provided adjacent to the rotor 3 includes a collar 16 preferably made of a non-magnetic material, a plurality of conical arms 17 extending outward at equal angles from the center, and A plate-shaped return spring 20 fixed to the collar 16 so as to be sandwiched between the collar 18 of the collar 16 and the flange 19 fitted into the collar 16, and a magnetic material fixed to the arms 7 of the return spring 20 with rivets 21. The amateur disk 22, which is more cautious, is attached to the flange 19.
- at least one protrusion 23 provided physically; one end of the collar 16 is configured such that the collar 16 and the disk 22 do not substantially contact the rotor 3; It is fitted into the shaft hole of the first auxiliary bearing 15 and is pivotally supported.

A coiled spring 24 is housed in the shaft hole of the collar 16, and a claw 25 provided at one end of the spring 24 connects to a groove 25 provided on the side surface of the collar 16 on the rotor side.
6 and is locked.

The input hub section 5 includes a sprocket 27, an armature
It consists of a hub 28, a bearing 29, a preload plate 30, and a second auxiliary bearing 31, and a spring locking hole 32 is provided in the sprocket 27. A pawl 25' provided at the other end of the coiled spring 24 is inserted, and approximately half of the length of the coiled spring 24 is wound approximately tightly around the curved surface of the armature hub 28. The remaining portion of the coiled spring 24 covers the outer peripheral surface of the hub 33 of the output shaft 6 so as not to contact the hub 33 except when the electromagnetic coil 8 is excited.

Therefore, the armature section 4 and the input hub section 5 are connected via the coiled spring 24.

The preload plate 30 has a side surface a of the preload plate 30.
A second auxiliary bearing 31 is fixed to the preload plate 30 and has a shape such that it can come into contact with the protrusion 23 provided on the flange 19 of the armature portion 4, and the preload plate 30 is attached to the sprocket 27. It can be appropriately fixed to the sprocket 27 with a screw 35 through a long hole 34 provided in the sprocket 27 .

The other side of the collar 16 is inserted into the shaft hole of the second auxiliary bearing 31.

Therefore, the collar 16 is pivotally supported by the first auxiliary bearing 15 and the second auxiliary bearing 31.

It is.

In the spring clutch 1 having the above-described structure, the protrusion 23 provided on the flange 19 of the armature section 4 is pressed by the side surface a of the preload plate 30, which can be fixed to the sprocket 27 as appropriate, to connect the armature section 4 and the input hub section 5. The relative position of the preload plate 30 is fixed to the sprocket 27 and the preload plate 30 is fixed to the sprocket 27 so that this state can be maintained, and furthermore, auxiliary bearings 15 and 31 are provided on the rotor 3 and the input hub portion 5, respectively, The collar 16 is attached to the bearing 1.
5.31, when the electromagnetic coil 8 is not excited, the auxiliary bearing 15
゜31 helps only the input hub part 5 and the armature part 4 to rotate smoothly, and completely cuts off the transmission system between input and output, causing unnecessary burden on the machine to which the spring clutch is applied. Of course, by pressing the protrusion 23 provided on the flange 19 with the side a of the preload plate 30, the coiled spring 24 outputs the relative position between the armature portion 4 and the input hub portion 5. Displace the preload plate 30 to a position where it does not substantially contact the sprocket 2 of the shaft 6.
7, when the electromagnetic coil 8 is excited, the coiled spring 2 is fixed at this position.
In addition, the auxiliary bearings 15 and 31 reduce the resistance generated in each part and facilitate the contraction of the coiled spring 24, so that when the driving side and the driven side are connected. In addition, even when the electromagnetic coil 8 is de-energized, the auxiliary bearing 15.31 facilitates the relaxation of the coiled spring 24, thereby causing the output shaft 6 to reach the bubble 33. The binding can now be released in a very short time, and the responsiveness between the drive side and the driven side when the connection is released is also greatly improved. It is possible to have a very large range of displacement in the relative position between the input hub section 4 and the input hub section 5, and therefore it can also be used as a delay clutch.

In addition, as mentioned above, the spring clutch of the present invention has the following features:
It exhibits excellent responsiveness both when connecting and uncoupling the driving side and driven side, but in order to prevent vibrations due to unnecessary magnetic force, the above-mentioned collar is made of a non-magnetic, strong, durable and friction-resistant collar. It is preferable to use a material that takes these factors into consideration, such as a copper-based oil-impregnated alloy, Duracon (polyacetal resin, a trade name of Polyplastics Co., Ltd.), etc.

Further, as shown in this embodiment, a plate-shaped return spring is provided with a plurality of conical arms extending outward from the center at approximately equal angles, and an armature disk made of a magnetic material is attached to each arm of the plate-shaped return spring. The disc and the rotor are brought into close contact only when the electromagnetic coil is excited, and when the electromagnetic coil is not excited, the disc and the rotor are separated by the restoring force of the return spring, causing a slight difference between them. Although the responsiveness can be further improved by configuring the gap to be formed, the present invention is not limited to this. It goes without saying that the purpose and effects of the present invention can be fully achieved even if the Kalani and the amateur disk are integrally configured, and the words "input" and "output" used in the explanation of the above embodiments can also be used. is used for convenience, and it is of course possible to obtain input from the output shaft side and output from the input hub side.

Further, in the above-described embodiment, a part of the rotor is provided for compatibility, but it goes without saying that even if the present invention is implemented with a part of the rotor omitted, the same effects can be obtained.

As described above, the spring clutch of the present invention is provided with a mechanism for pre-contracting the coiled spring to the inner diameter as required and maintaining this state, and furthermore, an auxiliary bearing is provided in the input hub section to compress the coiled spring to the required inner diameter. By configuring the collar in which the clutch is housed to be supported by the bearing, the responsiveness when connecting and disconnecting the drive side and driven side is significantly improved, and it can also be used as a daytime clutch. It has real benefits.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is an exploded perspective view of FIG. 2 is the field club, 3 is the rotor club, 4 is the amateur club,
Reference numeral 5 represents a human power hub portion, 15 represents a first auxiliary bearing, 16 represents a collar, 22 represents an armature disk, 24 represents a coiled spring, and 31 represents a second auxiliary bearing.

Claims (1)

[Scope of utility model registration request] In an electromagnetic spring clutch that connects and disconnects a driving side and a driven side by contraction and relaxation of a coiled spring connecting a hub part and an armature part, the hub part has a preload plate, and the preload plate is fixed at a desired position of the hub part by pressing the armature part and appropriately displacing the relative position of the hub part and the armature part,
An electromagnetic spring clutch characterized in that a collar constituting the armature portion and to which one end of the coiled spring is locked is pivotally supported by the hub portion with a bearing.