JPH1061679A - Rubber vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of cracks in a rubber vibration isolator by providing a rubber vibration isolator main body having a recessed part of the inner peripheral part fitted to a projecting part of an input shaft side member, and a holding member made of steel material which is held in such a manner as to cover the above main body and fitted to a clutch plate. SOLUTION: A fan-like projecting part 7 is integrally provided on the outer peripheral part of an annular hub plate 4 toward the outer peripheral direction, and a fan-like grooved recessed part 9 of a fan-like plate rubber vibration isolator main body 8 is fitted to the above from the outer peripheral side. Subsequently, a holding member 10 made of steel material is provided in such a manner as to cover the main body 8 from the outer peripheral side, and fitted to a clutch plate 2 by a rivet 11. Even if the main body 8 is elastically deformed toward the outer periphery by centrifugal force by the rotation of the input shaft 3, it is checked by the holding member 10. Accordingly, it is possible to prevent stress from being concentrated on a part of the main body 8 to cause cracks, so that durability of the rubber vibration isolator 5 can be improved. On the other hand, as the inner peripheral side of the main body 8 is opened, the main body 8 can be elastically deformed toward the inner peripheral side and a spring constant can be kept small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an anti-vibration rubber according to an anti-vibration technique, and more particularly, to an anti-vibration rubber suitable for use in an electromagnetic clutch such as a compressor.

[0002]

2. Description of the Related Art As shown in FIG. 7, an anti-vibration rubber 52 used for an electromagnetic clutch 51 of a compressor or the like has conventionally been formed in a cylindrical shape. While being fitted in a mounting hole 55 provided in a hub plate 54, which is a member of the clutch plate 57, and connected to a clutch plate 57 side by a rivet 56 inserted into the inner peripheral side thereof. The anti-vibration rubber 52 is a clutch plate 57
And a plurality of hub plates 54 are provided in an equidistant manner,
In addition, the spring constant is set low (the rubber hardness is set low (Hs ≒ about 50)) so that the connection of the electromagnetic clutch 51 is easy or smooth. In addition, an annular groove 58 is provided on the outer peripheral surface of the anti-vibration rubber 52 so as to engage the anti-vibration rubber 52 with a peripheral portion of the mounting hole 55 of the hub plate 54.

However, in the above prior art, as shown in FIG. 8, when a large centrifugal force F is applied at the time of high-speed rotation, the vibration isolating rubber 52 is moved in the outer circumferential direction (the electromagnetic clutch centered on the center axis 0) at a part 52a thereof. If it is elastically deformed in the direction of the outer periphery of the groove 51 and is continuously used as it is, stress concentrates in the vicinity of the groove 58, and there is a problem that a crack (not shown) is generated here.

Therefore, conventionally, the anti-vibration rubber 52 is prevented from being elastically deformed in the outer peripheral direction by the centrifugal force as described below.

As shown in FIG. 9, by bending a part 56 a of the rivet 56 so as to surround the vibration isolating rubber 52, the vibration isolating rubber 52 is prevented from being elastically deformed. As shown in FIG.
By bending “a” so as to surround the anti-vibration rubber 52, the anti-vibration rubber 52 is prevented from being elastically deformed. As shown in FIG. 11, an annular rigid plate 59 is baked on one end in the axial direction of the vibration-proof rubber 52, thereby preventing the vibration-proof rubber 52 from being elastically deformed.

However, according to these conventional deformation preventing measures, the cylindrical vibration-isolating rubber 52 is provided around the rivet 56, the hub plate 54 or the plate 5 over its entire circumference.
As a result, the spring constant of the entire vibration-isolating rubber 52 is increased, which causes the electromagnetic clutch 51 to be switched ON / OFF. At times, the anti-vibration function that the anti-vibration rubber 52 should originally perform may not be sufficiently exhibited.

[0007]

SUMMARY OF THE INVENTION In view of the above, the present invention prevents the rubber cushion from elastically deforming in the outer peripheral direction due to the centrifugal force, so that stress concentrates on a part of the rubber cushion and cracks occur. Can be prevented, and on the other hand, it does not excessively limit the elastic deformation of the anti-vibration rubber, so that the original anti-vibration function of the anti-vibration rubber can be fully exhibited It is an object to provide an excellent anti-vibration rubber.

[0008]

In order to achieve the above-mentioned object, a plurality of vibration-isolating rubbers of the present invention are equally arranged between a clutch plate of an electromagnetic clutch arranged coaxially and a member on an input shaft side. An anti-vibration rubber body provided with a concave portion on an inner peripheral portion and fitted from an outer peripheral side to a convex portion provided on an outer peripheral portion of the member on the input shaft side; A holding member made of a rigid material, which holds the vibration rubber main body so as to cover it from the outer peripheral side and is attached to the clutch plate.

In the vibration isolating rubber of the present invention having the above structure, since the holding member holds the vibration isolating rubber main body so as to cover it from the outer peripheral side, the vibration isolating rubber main body is moved in the outer peripheral direction by centrifugal force. Even if an attempt is made to elastically deform, the presence of the holding member prevents elastic deformation in the same direction. On the other hand, the vibration-proof rubber main body held by the holding member so as to cover from the outer peripheral side is allowed to be elastically deformed in this direction because its inner peripheral side is open.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, a plurality of vibration isolating rubbers 5 are provided between a clutch plate 2 of an electromagnetic clutch 1 arranged coaxially with a hub plate 4 which is a member on the input shaft 3 side. The vibration isolating rubbers 5 are provided in an equidistant manner (the drawing shows only one of them), and each of the vibration damping rubbers 5 has the following configuration. The number of equal distributions is generally three or four, but the number is not particularly limited. Although the hub plate 4 is annular and fixed to the end of the input shaft 3 with bolts 6, the hub plate 4 may be formed in a boss shape that is integral with or separate from the input shaft 3. .

First, on the outer peripheral portion of the annular hub plate 4,
A plate-shaped convex portion 7 having a substantially fan shape when viewed from the axial direction is integrally provided toward the outer peripheral direction, and the convex portion 7 is formed from the outer peripheral side with respect to the axial direction as shown in FIG. A plate-shaped anti-vibration rubber main body 8 having a substantially fan shape when viewed is fitted. That is, the substantially fan-shaped anti-vibration rubber body 8
A groove-shaped concave portion 9 having a substantially sector shape corresponding to the convex portion 7 is provided on an inner peripheral portion of the rubber member. 7. The vibration isolating rubber body 8 is made of rubber, and its spring constant is set low (the rubber hardness is set low (Hs ≒ about 50)) so that the connection of the electromagnetic clutch 1 is particularly easy or smooth. ).

Next, a holding member (also referred to as a holder) 10 is provided so as to cover the vibration-isolating rubber body 8 from the outer peripheral side thereof. The holding member 10 holds the vibration-isolating rubber body 8 and rivets. 11 attaches to the clutch plate 2. The holding member 10 is made of a rigid material such as a metal such as a sheet metal or a hard resin.

The holding member 10 includes a pair of members 12 and 13. The pair of members 12 and 13 are in contact with each other and are fixed to the clutch plate 2 by rivets 11. , This mounting portion 12a,
An outer peripheral portion 12b, which is bent in a direction away from the inner peripheral end portion of 13a to cover the vibration-isolating rubber main body 8 from the outer peripheral side,
As shown in FIG. 2 or FIG. 3, axial portions 12 c and 13 c which are bent inward from the axial ends of the outer peripheral portions 12 b and 13 b to cover the vibration-isolating rubber body 8 from its axial direction. The vibration isolating rubber body 8 is bent axially from both ends in the circumferential direction of the axial portion 12 c of the one member 12.
And a pair of circumferential stoppers 12d for limiting the relative displacement of the hub plate 4 and the holding member 10 in the circumferential direction to a certain amount.

By being held by the holding member 10 from the outer peripheral side, the vibration isolating rubber main body 8 is moved in the outer peripheral direction (the outer peripheral direction of the electromagnetic clutch 1 about the center axis 0), the axial direction, and The elastic deformation in the circumferential direction is restricted, and the electromagnetic clutch 1 with the inner circumferential direction (center axis 0
Elastic deformation is allowed only in the inner circumferential direction). That is, in the latter inner circumferential direction, since the convex portion 7 is inserted into the concave portion 9, the elastic deformation of the vibration isolating rubber main body 8 is limited within a range where the convex portion 7 prevents elastic deformation. In the range around the convex portion 7 where the convex portion 7 does not prevent elastic deformation, the vibration-proof rubber main body 8 is allowed to swell and deform in this direction.

Further, the outer peripheral portion 12b of the one member 12 is bent so as to wrap around the inner peripheral side of the clutch plate 2, and the vibration isolating rubber body 8 is disposed further inner peripheral side of the outer peripheral portion 12b. Assuming that the inner diameter of the clutch plate 2 is the same as the inner diameter of the clutch plate 57 in the prior art shown in FIG.
The centrifugal force acting on the anti-vibration rubber main body 8 is significantly reduced as compared with the related art.

A pulley 16 is rotatably mounted on the housing 14 via a bearing 15, and a coil 17 is disposed in an annular space of the pulley 16. In the electromagnetic clutch 1, a series of members from the clutch plate 2 to the rivet 11, the vibration isolating rubber 5, the hub plate 4, and the input shaft 3 move in the axial direction according to the ON / OFF switching, and transmit the rotational torque. To control,
Since the anti-vibration rubber 5 has the above-described configuration, the following operation and effect can be obtained.

First, in the vibration isolating rubber 5 having the above configuration, the holding member 10 made of a rigid material having the pair of members 12 and 13 holds the vibration isolating rubber main body 8 so as to cover it from the outer peripheral side. Therefore, even if the vibration isolating rubber body 8 attempts to elastically deform in the outer peripheral direction due to centrifugal force, the presence of the holding member 10 prevents elastic deformation in the same direction. Therefore, it is possible to prevent stress from being concentrated on a part of the vibration isolating rubber body 8 and to generate a crack, thereby improving the durability of the vibration isolating rubber 5.

On the other hand, since the inner peripheral side of the anti-vibration rubber main body 8 held so as to cover from the outer peripheral side by the holding member 10 is opened, the anti-vibration rubber main body 8 is elastically deformed in this direction. It is possible. Therefore, the spring constant can be kept small as compared with the prior art, thereby increasing the degree of freedom in design.

Further, as described above, since the anti-vibration rubber 5 is disposed on the inner peripheral side of the electromagnetic clutch 1 as compared with the prior art, the magnitude of the centrifugal force acting on the anti-vibration rubber main body 8 is smaller than in the prior art. It is much smaller than in comparison. Therefore, when rotating at the same rotational speed as the conventional one, the load on the vibration isolating rubber main body 8 can be reduced.

As shown in FIGS. 5 and 6, in order to prevent an increase in rubber hardness due to the rubber body 8 being surrounded by the holding member 10, the outer circumferential surface of the rubber body 8 and its axial direction are prevented. A rib-shaped projection 18 may be provided on the end face to adjust the rubber hardness.

[0022]

The present invention has the following effects.

That is, in the vibration-proof rubber of the present invention having the above-described structure, the holding member made of a rigid material holds the vibration-proof rubber main body so as to cover it from the outer peripheral side. Even if an attempt is made to elastically deform in the outer peripheral direction due to centrifugal force, the presence of the holding member prevents the elastic deformation in the same direction. Therefore, it is possible to prevent the stress from being concentrated on a part of the vibration isolating rubber body and to generate a crack, thereby improving the durability of the vibration isolating rubber.

On the other hand, since the inner peripheral side of the vibration isolating rubber main body held so as to cover from the outer peripheral side by the holding member is open, the vibration isolating rubber main body can be elastically deformed in this direction. It is. Therefore, the spring constant can be kept small as compared with the prior art, thereby increasing the degree of freedom in design.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mounted state of an anti-vibration rubber according to an embodiment of the present invention.

FIG. 2 is a view in the direction of arrow A in FIG. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is a side view of the anti-vibration rubber.

FIG. 5 is a side view of an anti-vibration rubber according to another embodiment.

6 is a sectional view taken along line CC in FIG. 5;

FIG. 7 is a cross-sectional view showing a mounted state of a vibration-proof rubber according to a conventional example.

FIG. 8 is a sectional view showing a deformed state of the vibration isolating rubber.

FIG. 9 is a sectional view showing a conventional deformation preventing measure.

FIG. 10 is a sectional view showing another conventional deformation prevention measure.

FIG. 11 is a sectional view showing another conventional deformation preventing measure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic clutch 2 Clutch plate 3 Input shaft 4 Hub plate 5 Anti-vibration rubber 6 Bolt 7 Convex part 8 Anti-vibration rubber main body 9 Depression 10 Holding member 11 Rivet 12, 13 Member 12a, 13a Mounting part 12b, 13b Outer part 12c, 13c Axial part 12d Circumferential stopper part 14 Housing 15 Bearing 16 Pulley 17 Coil 18 Projection

Claims (1)

[Claims] An electromagnetic clutch (1) arranged coaxially.
A vibration isolating rubber (5), a plurality of which are provided in an equidistant manner between the clutch plate (2) and the member (4) on the input shaft (3) side; An anti-vibration rubber main body (8) fitted to a projection (7) provided on an outer peripheral portion of the member (4) on the input shaft (3) side from an outer peripheral side thereof; And a holding member (10) made of a rigid material attached to the clutch plate (2) so as to cover the outer periphery of the clutch plate (2).