JPH0424183Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic clutch device, and more particularly, to an electromagnetic clutch device that can reduce noise during disconnection and save space.

[Background Art] Generally, auxiliary equipment such as an air conditioning compressor installed in a vehicle or the like is installed in an engine room in close proximity to an internal combustion engine or the like that drives the auxiliary equipment. These auxiliary machines are operated by engine driving force transmitted through an electromagnetic clutch which is controlled intermittently.

[Problems to be solved by the invention] By the way, as shown in Figure 3, in FF (front engine/front drive) vehicles, in addition to the internal combustion engine a, various devices such as the power transmission system are densely packed. When auxiliary equipment c such as a compressor is placed in the engine room b located at
Furthermore, it is necessary to secure the necessary space for the internal combustion engine a, which is rubber-mounted and displaces due to sudden braking or severe vibration, and then to be able to fit it compactly into a narrow space.

On the other hand, the electromagnetic clutch e that controls the operation of the auxiliary machine c basically has an armature h elastically supported by a hub f provided on the drive shaft of the auxiliary machine via a leaf spring g, as shown in Fig. 4. , this armature h is rotated by a pulley i which is rotationally driven from the engine side via a belt etc.
By energizing the electromagnetic coil, the armature h is brought into contact with the pulley i, and driving force is transmitted to the auxiliary machine c.

However, when the electromagnetic clutch e is engaged and engaged, a large shock torque is generated and noise is generated, so the following countermeasures have been proposed.

In the one shown in FIG. 5, the armature h, which is returned by a leaf spring g when the electromagnetic clutch is disconnected, is buffered by a rubber stopper k provided on the hub f.

In addition, in the one shown in FIG. 6, a rod l for attaching an armature h to a hub f is buried in a rubber damper m, so that the rod l is damped in both cases of disconnection.

Furthermore, the one shown in FIG. 7 connects the hub f and armature h with a rubber damper m, and is also equipped with a rubber stopper k at the time of return.
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In each of these proposals, it is preferable for the shock torque etc. to be buffered by the rubber damper m having a larger weight, but in any case, the rubber damper m etc. must be provided outside the electromagnetic clutch such as the armature h due to the device configuration. Therefore, it was necessary to secure the necessary space. Therefore, this conflicts with the above-mentioned space saving goal, and the rubber damper m, etc. has to be downsized, making it impossible to achieve a sufficient shock torque buffering function and noise reduction.

[Purpose of the invention] The present invention was devised in view of the above-mentioned problems, and its purpose is to eliminate the need for expanding the space required for the elastic buffer member that buffers shock torque, etc. to the outside of the auxiliary equipment. It is an object of the present invention to provide an electromagnetic clutch device that is constructed so that it can be installed with a considerable weight and achieves space saving while exhibiting a sufficient buffering function.

[Means for Solving the Problems] The present invention has a pulley rotatably fitted onto a drive shaft extending from an auxiliary machine, and a side surface of the pulley opposite to the auxiliary machine body side is connected to the auxiliary machine body. An annular gap is formed by making a cylindrical depression toward the main body side and continuous in the circumferential direction around the outer periphery of the drive shaft tip, and the drive shaft tip within this annular gap surrounds the outer circumferential surface of the drive shaft. An elastic buffer member is integrally provided at the tip of the shaft,
The elastic buffer member is provided with an armature that extends radially outward and transmits the rotational torque from the pulley to the drive shaft through spaced contact with the side surface of the pulley. A leaf spring is provided across the side of the pulley opposite to the auxiliary body to assist the return movement of the armature, and the side surface of the pulley on the side of the auxiliary body is cylindrical on the side opposite to the auxiliary body. By recessing the armature and installing an electromagnetic coil therein for bringing the armature into contact with the side surface of the pulley at a distance, the elastic shock absorbing member can be installed as close to the auxiliary equipment as possible and with a considerable weight. This is what I did.

[Embodiment] A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, 1 is a housing for an auxiliary machine B such as a compressor, and an insertion hole 2 is formed in the center of the housing 1 to penetrate therethrough. A drive shaft 3 of an auxiliary machine B extends through the insertion hole 2 and is rotatably provided therein. Moreover, a housing 1 is provided on the outside of this insertion hole 2.
A pulley 4 is fitted into the reduced diameter portion 1a formed by narrowing the outer shape of the drive shaft 3 so as to be rotatable with respect to the drive shaft 3 via an annular bearing 5. This pulley 5 is arranged adjacent to the outside of the drive shaft 3 of the auxiliary machine so as to be close to the main body of the auxiliary machine B, and its external shape is also approximately the same as that of the main body of the auxiliary machine. Further, this pulley 4 has a hollow structure, and a housing 1 is provided in the ring-shaped hollow part.
A ring-shaped electromagnetic coil 6 is housed while being supported by. Furthermore, one annular side surface of the pulley 4 facing in the direction in which the drive shaft extends serves as a friction surface 4a with which the armature 7 comes into contact and is separated. The pulley 4 is rotatably driven by receiving rotational torque transmitted from an internal combustion engine (not shown) via a belt or the like.

On the other hand, the drive shaft 3 is provided with an elastic shock absorbing joint 8 at its distal end portion extending outward in the radial direction. This elastic buffer joint 8 mainly includes a hub 9, a hub stopper 10 for stopping the hub 9 on the drive shaft 3, a leaf spring 11 provided on the hub stopper 10, and a hub 9.
and an elastic buffer member 12 provided on the outer circumferential side of. The hub 9 is formed in the shape of a sleeve, and is spline-fitted to the drive shaft 3, and a disk-shaped hub stopper 10 is press-fitted from the opposite direction to the drive shaft, and is secured by a bolt 13 attached to a central concave portion of the hub stopper 10. It is integrally attached to the drive shaft 3.

An annular gap S is formed between the drive shaft 3 configured in this manner and a pulley 4 provided on the auxiliary main body side so as to surround the drive shaft 3 on the outside thereof. This annular gap S is provided with a ring-shaped elastic buffer member 12 whose inner circumferential side is fixed to the outer circumferential side of the hub 9 by baking or the like. The elastic buffer member 12 functions to suppress noise by absorbing the shock torque generated due to the contact distance between the armature 7 and the friction surface 4a when the electromagnetic clutch is engaged or engaged.

On the other hand, leaf springs 11 are disposed on the outer surface of the hub stopper 10 at appropriate intervals in the circumferential direction. This leaf spring 11 has one end pinned to the hub stopper 10 and the other end pinned to the armature 7, and functions to assist the return movement (movement away from the friction surface 4a) of the armature 7.

The elastic shock absorbing joint 8 as described above is provided with a ring-shaped armature 7 extending radially outward therefrom and facing the friction surface 4a of the pulley 4. The armature 7 has a sleeve portion 7a extending inward from the inner peripheral edge of the armature 7 in order to face the outer peripheral surface of the elastic buffer member 12 disposed inside the pulley 4. An elastic buffer member 12 is bonded to the inner peripheral surface of this sleeve portion 7a by baking or the like, so that the armature 7 is elastically supported by the hub 9.

The armature 7 comes into contact with and separates from the friction surface 4a of the pulley 4 by energizing and de-energizing the electromagnetic coil 6, thereby transmitting the rotational torque from the pulley 4 to the drive shaft 3.

In particular, the elastic shock absorbing member 12 has a flange 12a that is sandwiched between the inner periphery of the moving armature 7 and the outer periphery of the hub stop 10 facing oppositely from the moving direction of the armature 7. Functions as a stopper when returning. Further, as shown in FIG. 2, only the ring-shaped inner and outer peripheral surfaces of the elastic buffer member 12 are fixed to the hub 9 and the armature 7, and when the armature 7 and the friction surface 4a come into contact, the elastic buffer member 12 The hub stop is 10 due to the deflection of
A gap A is formed between the two, and a buffering effect is exerted upon return.

By the way, in the present invention configured as described above, the pulley 4 is provided close to the auxiliary equipment main body side with respect to the drive shaft 3 of the auxiliary equipment, and the drive shaft 3 and the pulley 4 are connected to each other.
An elastic buffer member 8 is provided in the annular gap S between the pulley 4 and the armature 7 of the electromagnetic clutch, which is the outermost part of the auxiliary equipment, is supported from the inside of the pulley 4 to save space. By making it possible to arrange a large elastic buffer member 12 in the annular gap S, a sufficient buffering function can be exerted, and shock torque and noise can be reduced.

In addition, the flange portion 12a and the gap portion A can also improve the buffering function at the time of return.

[Effects of the Invention] In summary, the present invention provides the following excellent effects.

The elastic shock absorbing member can be installed with sufficient weight without requiring space radially outward from the auxiliary equipment, achieving sufficient space saving in the axial direction of the drive shaft while exhibiting a sufficient shock absorbing function to reduce shock torque and noise. can be achieved.

[Brief explanation of drawings]

Fig. 1 is a plan sectional view showing a preferred embodiment of the present invention, Fig. 2 is a sectional view of main parts showing the operating state of the electromagnetic clutch when it continues, and Fig. 3 is a layout of the engine room of a front-wheel drive vehicle. Schematic plan view shown, No. 4
7 to 7 are sectional views of main parts showing a conventional example. In the figure, 3 is a drive shaft, 4 is a pulley, 7 is an armature, 8 is an elastic shock absorbing joint, and B is an auxiliary machine.

Claims (1)

[Scope of utility model registration request] A pulley is rotatably fitted onto the drive shaft extending from the auxiliary machine, and the side surface of the pulley opposite to the auxiliary machine body side is recessed into a cylindrical shape toward the auxiliary machine body side to form a drive shaft tip. forming an annular gap continuous in the circumferential direction around the outer periphery, and providing an elastic buffer member integrally with the drive shaft tip so as to surround the outer circumferential surface of the drive shaft tip within the annular gap; The elastic buffer member is provided with an armature that extends radially outward from the armature and transmits rotational torque from the pulley to the drive shaft through spaced contact with the side surface of the pulley, and the armature is connected to the front end surface of the drive shaft and the armature. A leaf spring for assisting the return movement of the armature is provided across the side of the pulley opposite to the auxiliary body, and the side surface of the pulley on the side of the auxiliary body is cylindrical on the side opposite to the auxiliary body. An electromagnetic clutch device characterized in that an electromagnetic coil is provided in the depression for bringing the armature into contact with the side surface of the pulley at a distance.