JPH0266324A - Electromagnetic clutch - Google Patents

Abstract

PURPOSE:To improve the machining ability of the shaft engaging hole of a hub so as to improve the productivity of an electromagnetic clutch by using a part of a plate spring which forms an output rotor as a stopper for fixing the output rotor in its axial direction. CONSTITUTION:In an electromagnetic clutch, when an electric current flows into an exciter 12, magnetic flux is generated along a main magnetic circuit which is stated by a broken line. And a movable piece 8 is adsorbed into an input rotor 2, and torque exerted upon the input rotor 2 is transmitted to a hub 9, a key 21 and a shaft 20 in order through a plate spring 10 so as to rotate a compressor 1. Then when the electric current is checked, the magnetic flux disappears and the movable piece 8 is retreated toward the opposite side of the input rotor due to the spring force of the plate spring 10, so that a power transmission to the shaft 20 is interrupted. In this case, since the disc portion 10a of the plate spring 10 is used as a stopper 10f for fixing an output rotor 7 in its axial direction, a special part such as a washer or the like which is used as a stopper does not become necessary. As a result, the part cost and the installation cost of the electromagnetic clutch concerned can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electromagnetic clutch for transmitting power to a rotating machine, and more specifically, to an electromagnetic clutch for transmitting power to a rotating machine shaft of an output rotating body, which is an element of the electromagnetic clutch. Regarding the mounting structure.

[Conventional technology]

An electromagnetic clutch attached to a rotating machine such as a refrigerant compressor has an input rotating body equipped with a belt pulley rotatably attached to the end of the rotating machine via a bearing, and an output rotating body facing the input rotating body. A structure in which the rotor is fitted onto the shaft of a rotating machine via a hub is generally adopted. Among these, the output rotary body is composed of a movable piece that can be frictionally engaged with the input rotary body, and a leaf spring that supports the movable piece. Then, when the input rotary body and the output rotary body are magnetized, the movable piece is magnetically attracted to the input rotary body against the elastic force of the leaf spring, and power can be transmitted to the rotating machine shaft side.

In such an electromagnetic clutch, axial positioning (fixing) of the output rotating body on the shaft has conventionally been achieved by using a stopper on the inner periphery of the shaft fitting hole of the hub, as disclosed in, for example, Japanese Utility Model Application Publication No. 53-23850. This was done by forming a stopper part and locking it to one end of the shaft when the hub was fitted. In addition, when performing such positioning, an appropriate number of shims are inserted between the stopper part on the inner circumference of the hub and one end of the shaft of the rotating machine to close the air gap between the input rotating body and the output rotating body of the electromagnetic clutch. was adjusted to a predetermined value.

[Problem to be solved by the invention]

By the way, key engagement and spline methods are becoming mainstream as methods for fitting the hub to the shaft as described above, but in this case, a key groove is formed in the shaft fitting hole of the hub by broaching. First, it is technically difficult to integrally form the stopper portion with the hub.

Therefore, conventionally, in order to improve the workability of the fitting hole of the hub, a washer was formed separately from the hub, as disclosed in the above-mentioned Japanese Utility Model Publication No. 53-23850, and this washer was inserted into the hub. A method has been proposed in which a stopper portion is formed by inserting and fixing it around the circumference.

In the case where the washer is used as the stopper part, the hub and the stopper are separate members, so it is effective in improving the workability of the shaft fitting hole of the hub. However, according to this method, a washer serving as a stopper is required, which increases the number of parts, and the parts cost and installation cost increase accordingly.

The present invention has been made in view of the above points, and its purpose is to provide a stopper portion for an output rotating body without increasing the number of parts, and to improve the machinability of the shaft fitting hole of the hub. Improve.

The objective is to provide a good electromagnetic clutch for improving productivity.

[Means to solve the problem]

The above objective is achieved as follows.

Hereinafter, the present invention will be described with reference to the reference numerals of the embodiment shown in FIG. 1 to facilitate understanding thereof.

That is, the present invention is an electromagnetic clutch attached to a rotating machine 1 such as a magnetic medium compressor, which includes an input rotating body 2 rotatably attached to an end of the rotating machine 1, and an input rotating body 2 that is connected to the rotating machine 1 opposite to the input rotating body 2. and an output rotary body 7 fitted onto a shaft 20 via a hub 9, the output rotary body 7 supports a movable piece 8 with a leaf spring 10 so as to be movable in the axial direction. ,
In addition, this leaf spring 10 is attached to one end surface of the hub 9, and a part of the leaf spring 10 is extended inward to the shaft fitting hole 9a of the hub 9 to form a stopper portion 10f, and this stopper portion 10f is used. Then, the output rotating body 7 is connected to the shaft 2.
It is fixed in the axial direction of 0.

[Effect]

With such a configuration, by attaching the leaf spring 1o, which is a component of the output rotating body 7, to one end surface of the hub 9, a part 10f of the leaf spring 10 is placed inside the shaft fitting hole 9a of the hub 9. It can be extended without any problem. This extending portion serves as a stopper 10f for the shaft fitting hole 9 of the hub 9.
When the output rotating body 7 is attached to the shaft 20 by being located at the opening at one end of the stopper part 10f, the stopper part 10f can be connected to the one end 20c of the rotating machine shaft 20 directly or through a shim 22 as shown in FIG. In this way, the output rotating body 7 is fixed in the axial direction of the shaft 20. Furthermore, as shown in FIG. 1, it is also possible to interpose a shim 22 between one end of the shaft 20c and the stopper part 10f. The air gap G can be adjusted.

According to the present invention, the leaf spring 10 constituting the output rotating body 7 also serves as a stopper, so that special parts such as washers for forming a stopper as in the conventional case are not required.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal cross-sectional view showing a first embodiment of the present invention, taken along the line I-1 in FIG. 2, FIG. 2 is a front view taken from the direction of arrow A in FIG. 1, and FIG. FIG. 4 is an exploded perspective view of an output rotating body used in the electromagnetic clutch of the first embodiment, and a front view of a leaf spring constituting the output rotating body.

In FIG. 1, 1 is a compressor for a car air conditioner, 2 is an input rotating body, and 7 is an output rotating body, and the input rotating body 2 and the output rotating body 7 are the main components of the electromagnetic clutch.

The input rotating body 2 has a V-groove 2a formed on its outer periphery, and a power transmission bell (3) is hooked into the groove 2a. Also,
The input rotary body 2 has a magnetic annular core portion 2b as a main body, and this annular core portion 2b is formed into a cross-sectional shape of two shapes in order to flow magnetic flux, and a bearing 4 fitted on the inner periphery of the core portion 2b. It is rotatably attached to the housing 1a of the compressor 1 via the compressor 1.

Reference numeral 12 denotes an excitation device for generating magnetic flux, which includes a stator yoke 13 with a cross-section of two shapes forming the magnetic circuit B shown by the dotted line in the figure, and a stator yoke 13 that is insulated and fixed inside the stator yoke 13 with resin. It consists of an excitation coil 15 and a holding plate 16 joined to the back surface of the stator yoke 13, and is fixed to the housing 1a with a clip 18 while being enclosed in the core portion 2b of the input rotating body 2.

On the other hand, the output rotary body 7 includes a movable piece 8 for frictionally engaging with the input rotary body 2 when the electromagnetic clutch is activated, a hub 9 that fits onto the shaft 20 of the compressor 1, and a movable piece 8 that moves in the axial direction. It is composed of three members including a leaf spring 10 for possible support. As shown in FIG. 4, the leaf spring 1o includes a disk portion 10a having three rivet holes 10b, and a disk portion 1
A ring-shaped spring portion 10d extending in three directions outward from Oa is integrally formed. Here, the inner diameter φ of the disc portion 10a
Dl is smaller than the diameter φD2 of the shaft 2o shown in FIG. 1, and is the thread diameter φ of the male thread 20a provided at the end of the shaft.
It is punched to a size slightly larger than D3. Further, a stepped protrusion 10c is provided on the outer periphery of the disk portion 10a of the leaf spring.
is formed. As shown in FIG. 1, the stepped protrusion 10c is designed to reliably separate the movable piece 8 from the input rotating body 2 when the clutch is turned off with the elastic piece 8 supported by the leaf spring 10. This is for giving an offset to the spring portion 10d.

Therefore, as shown in FIG. 3, the spring portion 1 of the leaf spring 10
A rivet hole 10e is formed on the outer periphery of 0a, while a movable piece 8
By providing a rivet hole 8a at a corresponding position, and driving a rivet 11b into the rivet holes 10e and 8a, the movable piece 8 is coupled to the spring portion 10d of the leaf spring 10, and the disc portion 10a of the leaf spring 10 is connected to the movable piece 8. The rivet hole 10b provided in the hub 9
The leaf spring 10 is fixed to the end face of the hub 9 by driving into the rivet hole 9C provided on the end face, and in this way the output rotary body 7
is configured.

The inner circumferential surface (shaft fitting hole) 9a of the hub 9 is reamed, and then the keyway 9b is finished by broaching.

Next, the attachment of the output rotating body 7 to the compressor 1 will be explained.

First, a key 21 as shown in FIG. 1 is fitted into the keyway 20b of the shaft 20 of the compressor. In addition, the shaft 20
A threaded portion 20a is formed at one end, but this male thread 2
The diameter φD3 of 0a is smaller than the diameter φD2 of the shaft 20, and a stepped 20c is installed between the external thread 20a and the shaft 20.
is preformed. Then, with the shim 22 in contact with the stepped 20c end face (shaft end face), the male thread 20c
It is placed at the base of a.

Next, while the hub 9 of the output rotating body 7 is engaged with the key 21 on the shaft 20 side with its keyway 20b, the shaft 20 is
The disk portion 10a of the handling spring 10 is fitted onto one end of the outer periphery of the spring 10.
(stopper part) 10f comes into contact with the shim 22, and then tighten the nuts 1 to 23 onto the external thread 20a of the shaft 20 to complete the installation.

Stopper portion 1 provided on disk portion 10a of leaf spring 10
0f is the key point of this embodiment, and this stopper 1
Of is formed as follows.

That is, in this embodiment, the disc part 10a has a structure that is applied to the end of the hub 9, but in this case, the disc part 10a
Since the inner diameter φD1 of a is smaller than the inner diameter (shaft fitting hole) of the hub 9, a part (center part) of the 1-disk portion 10a extends inward of one end of the opening of the hub 9. . The range of this extension corresponds to the area indicated by the dashed line C in FIGS. 2 and 3.

This extending portion 10f serves as a stopper portion and is locked to the stepped end surface 20c of the shaft 20 via the shim 22, thereby fixing the output rotating body 7 to one end of the shaft 20 in the axial direction. . Furthermore, a shim 22 is interposed between the stepped end surface 20c at one end of the shaft 20 and the stopper 10f, so that the air gap G between the input rotary body 2 and the output rotary body 7 is maintained. The thickness and number of shims 22 are selected in advance so that the air gap G between the input rotating body 2 and the movable piece 8 is a predetermined value.

In addition, in the electromagnetic clutch having such a configuration, when the excitation device 12 is energized, the main magnetic circuit 8 shown by the broken line in FIG.
A magnetic flux is generated along the axis, the movable piece 8 is attracted to the input rotating body 2, and the rotational force applied to the input rotating body 2 is transmitted from the hub 9 to the key 21 to the shaft 20 via the leaf spring 1o. and rotate the compressor 1. Next, when the power supply is cut off, the magnetic flux disappears and the movable piece 8 is pulled back toward the side opposite to the input rotating body by the spring force of the leaf spring 10, and power transmission to the shaft 20 is cut off.

In this embodiment, the disk portion 10a of the leaf spring 10 also serves as the stopper 10f for fixing the output rotating body 7 in the axial direction, so that special parts such as washers as a stopper are not required as in the conventional case. First, as a result, the cost of parts and installation of the electromagnetic clutch can be reduced.

FIG. 5 is a front view of an electromagnetic clutch showing a second embodiment of the present invention. In FIG. 6, the same reference numerals as in the already described first embodiment indicate the same or common elements.

Since the difference between this embodiment and the first embodiment described above is only in the shape of the leaf spring 1o, only the contents thereof will be explained here. The leaf spring 10 of this embodiment uses three leaf springs having the same shape. The leaf spring 10 is as shown in FIG.
Each has the same T-shape.

It has a leaf shape.

When the leaf-shaped leaf spring 10 is placed facing the input rotating body 2 as shown in FIG. Extend to block. Tip 10f' of this extending portion 10F
has an arcuate shape as shown in FIG. 6, and this extending portion 10
It is set so that when the diameters f are opposed to each other, a diameter matching the diameter φD1 of the first embodiment is formed.

This protruding portion 10f thus functions as a stopper portion. That is, the stopper part 10f is held between the shim 22 and the nut 23 when assembled to the compressor 1, in the same way as the disc part 10a of the leaf spring used in the first embodiment.
It functions to fix the output rotating body 7 in the axial direction.

In the embodiment described above, a key is used as a means for locking the hub 9 and the shaft 2° in the rotational direction, but it goes without saying that the present invention can also be applied to a spline connection. Furthermore, when it is not necessary to accurately adjust the air gap G, the leaf spring may be brought into direct contact with the end surface of the shaft 20 without using the shim 22.

〔Effect of the invention〕

As described above, according to the present invention, a part of the plate spring that is a component of the output rotor can also serve as the stopper part for fixing the output rotor in the axial direction, so that it can be used as a stopper part for fixing the output rotor in the axial direction. This eliminates the need for parts and reduces the number of parts compared to conventional technology. Furthermore, the fitting hole of the hub that fits into the shaft can be made straight, so the hub can be broached separately in advance, and this type of electromagnetic The production efficiency of clutches can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an electromagnetic clutch according to a first embodiment of the present invention, taken along line 1-1 in FIG. 2, and FIG. 2 is a front view of FIG. 1 viewed from direction A. FIG. 3 is an exploded perspective view of the output rotating body used in the first embodiment, FIG. 4 is a front view of the leaf spring used in the first embodiment, and FIG. A front view of the clutch, and FIG. 6 is a front view of the leaf spring used in the second embodiment. DESCRIPTION OF SYMBOLS 1... Rotating machine, 2... Input rotating body, 7... Output rotating body, 8... Movable piece, 9... Hub, 9a... Shaft fitting hole, 1o... Plate Spring, 10a...disc part,
10f...stopper part (extending part), 20...shaft, 20a...male thread part, 20c...stepped part, 22...shim, 23...narato. Dream 2 drawing Kyou's lσ- & tfh z3- Gatsuto Sensei drawing 4

Claims (2)

[Claims] 1. An electromagnetic clutch attached to a rotating machine such as a refrigerant compressor, which has an input rotating body rotatably attached to the end of the rotating machine, and is fitted to the shaft of the rotating machine opposite the input rotating body via a hub. and an output rotating body,
The output rotating body has a movable piece supported movably in the axial direction by a leaf spring, and the leaf spring is attached to one end surface of the hub, and a part of the leaf spring is inserted into the shaft fitting hole of the hub. An electromagnetic clutch characterized in that the output rotating body is fixed in the axial direction of the shaft using a stopper part extending inwardly of the shaft. 2. In the first aspect, a male threaded portion is formed at one end of the shaft to tighten the leaf spring to the hub end surface in cooperation with a nut, and the male threaded portion has a diameter smaller than that of the shaft. Forming a step at one end,
An electromagnetic clutch in which a shim for adjusting the gap between the input and output rotating bodies is interposed between the step and the stopper portion formed on the leaf spring.