JPH0730995Y2 - Electromagnetic clutch cushion rubber mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is an electromagnetic clutch provided in, for example, a compressor for an air conditioner that operates by receiving power from an automobile engine, through which power is intermittently transmitted. In particular, the present invention relates to a cushion rubber mounting structure for an electromagnetic clutch having a cushion rubber.

[Conventional technology and problems]

In the conventional electromagnetic clutch, the armature (rotor) holds a buffer spring to adsorb and disengage from the runner (mainly rotating) to measure the intermittent power transmission, but the operation is uncertain because of its complicated structure. There were many cases that caused a failure.

Therefore, as shown in FIG. 5, a structure has been proposed in which a buffer rubber 3 is used instead of the buffer spring and the hub 1 and the bracket 4 are baked and fixed. However, when transmitting power, shearing in the buffer rubber is proposed. There is a drawback that the cushioning rubber deteriorates due to heat generated by stress.

In the figure, 2 is a drive shaft, 5 is an armature, 6 is a rotating body, 7 is an exciting coil, and 8 is a rivet.

[Means for solving problems]

The cushion rubber mounting structure of the electromagnetic clutch of the present invention has the following structure as a means for solving the drawbacks of the conventional example.

(1) In an electromagnetic clutch in which an armature is connected to a hub connected to a drive shaft of a compressor or the like via an annular buffer rubber, the inner circumferential surface of the buffer rubber is seized and fixed to the outer peripheral surface of the hub, and The outer circumferential surface of the cushioning rubber is baked and fixed to the inner circumferential surface of a plurality of arcuate hub rings made of thin plates in a shape that joins the inner circumferential surface of the annular bracket attached to the armature, and the inner diameter of the bracket The outer diameter of the baked and fixed hub ring is slightly increased, and when the two are assembled together, the hub ring is pressed inward against the elasticity of the cushioning rubber while being compressed inward.

(2) The arcuate hub ring made of a thin plate has, for example, a four-divided arcuate shape having gaps at both ends and is formed with a protrusion for retaining in the circumferential direction and a protrusion for preventing rotation in the axial direction. It is designed to engage with the correspondingly shaped recess in.

(3) An outer peripheral surface of a plurality of arcuate hub rings made of thin plates, the outer peripheral surface of the buffer rubber being baked and fixed to the inner surface of the annular bracket, and the inner peripheral surface of the buffer rubber engaging with the outer peripheral surface of the hub. Is fixed by baking, and the hub ring is pushed in while expanding the hub ring outward against the elasticity of the cushioning rubber.

[Action]

According to the present invention, since the shock-absorbing rubber in the conventional example is baked and fixed in a free state and no stress due to compression is applied in advance, the amount of sliding movement between the outer layer and the inner layer in the shock-absorbing rubber during power transmission is large. Since the rubber is deteriorated by the heat generated by the shear stress for that reason, if the compressive stress is applied to the cushioning rubber in advance, the relative movement amount between the outer periphery and the inner periphery of the cushioning rubber will be small during power transmission. Therefore, the heat generated by the shear stress is also reduced.

According to the present invention, since the shock-absorbing rubber is assembled by applying a compressive force in advance, the heat generated is reduced by the above theory, which is effective in preventing the rubber from aging.

〔Example〕

An embodiment will be described with reference to the drawings. In FIGS. 1 and 2, 1 is a hub connected to a drive shaft 2 of a compressor, 3 is an annular cushion rubber, and its inner circumferential surface is the outer circumferential surface of the hub 1. It sticks by burning. Reference numeral 4 denotes an annular bracket which is fixed to the armature 5 with rivets 8. Buffer rubber 3
The inner peripheral surfaces of a plurality of arcuate hub rings 9 made of thin plates are fixed to the outer peripheral surface by baking. As will be described later, the hub ring 9 is formed with a circumferential plate stopper protrusion 9a and an axial rotation stopper protrusion 9b, which engage with corresponding recesses on the inner peripheral surface of the bracket 4. . As described above, the outer diameter of the hub ring 9 which is baked and fixed is slightly larger than the inner diameter of the bracket 4. Therefore, when assembling the both 9 and 4, the hub ring 9 is pushed inward against the elasticity of the rubber cushion 3. It is pushed into the bracket 4 while being contracted, and a compressive force is applied to the cushion rubber in advance.

As shown in FIGS. 3 and 4 in an enlarged manner, the hub ring 9 has, for example, a four-divided arc shape having a gap at both ends, and has a plate stopper protrusion 9a in the circumferential direction and a rotation stopper protrusion 9b in the axial direction. Then, the bracket 4 is engaged with a corresponding recess on the inner peripheral surface of the bracket 4. The bent portions at both ends of the hub ring 9 are for facilitating escape of the outer surface when the buffer rubber 3 is preloaded.

Although one example of implementing the present invention has been shown above, other examples not shown are possible. For example, in the first embodiment, the hub ring 9 is provided outside the cushion rubber 3, but it is also possible to provide the hub ring 9 inside the cushion rubber 3 easily. Further, the hub ring 9 may have a two-part or three-part arc shape instead of the four-part arc shape.

[Effect of device]

(1) The structure is simple and the initial compression force can be easily applied to the cushion rubber.

(2) When the initial compression force is applied to the cushioning rubber, the sliding of the inner and outer layers is smaller than that in the free state when transmitting the rotational force,
Therefore, since the temperature rise of the rubber due to the shear stress is small, it is possible to prevent the rubber from aging.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an electromagnetic clutch, FIG. 2 is a partially enlarged sectional view of the same, and FIG. 3 is a lateral sectional view of an essential part thereof. FIG. 4 is an enlarged front view and a sectional view of the hub ring. FIG. 5 is a vertical sectional view of an electromagnetic clutch showing a conventional example. Reference numerals in the drawings indicate the following members, respectively. 1: Hub, 2: Drive shaft 3: Buffer rubber, 4: Bracket 5: Armature, 6: Rotating body 7: Electromagnetic coil, 8: Rivet 9: Hub ring

Claims (4)

[Scope of utility model registration request] 1. An electromagnetic clutch in which an armature is connected to a hub connected to a drive shaft of a compressor or the like via an annular buffer rubber, and an inner circumferential surface of the buffer rubber is seized and fixed to an outer peripheral surface of the hub. The outer peripheral surface of the cushioning rubber is baked and fixed to the inner peripheral surface of a plurality of arcuate hub rings made of thin plates in a shape that engages with the inner peripheral surface of an annular bracket attached to the armature, and the bracket The outer diameter of the hub ring fixed by baking is slightly larger than the inner diameter of the hub ring, and when the two are assembled, the hub ring is pushed inward against the elasticity of the cushioning rubber while being pushed inward into the bracket. Electromagnetic clutch cushion rubber mounting structure. 2. The arcuate hub ring made of a thin plate has, for example, a four-divided arcuate shape having a gap at both ends and is formed with a protrusion for preventing slip-off in the circumferential direction and a protrusion for preventing rotation in the axial direction. The cushion rubber mounting structure for an electromagnetic clutch according to claim 1, characterized in that it is adapted to be engaged with a recess of a corresponding shape on the peripheral surface. 3. An electromagnetic clutch for connecting an armature to a hub connected to a drive shaft of a compressor or the like via an annular buffer rubber, wherein an outer circumferential surface of the buffer rubber is attached to the armature. In addition to being seized and fixed to the inner peripheral surface, the inner peripheral surface of the cushioning rubber is seized and fixed to the outer peripheral surface of a plurality of arcuate hub rings made of thin plates that engage with the outer peripheral surface of the hub, and the outer surface of the hub. The diameter of the hub ring is made slightly larger than the inner diameter of the hub ring that is baked and fixed, and when the two are assembled, the hub ring is pushed outward against the elasticity of the cushioning rubber and pushed into the hub. Electromagnetic clutch cushion rubber mounting structure. 4. The hub-shaped arc-shaped hub ring made of, for example, a four-divided arc having a gap at both ends and formed with a protrusion for retaining in the circumferential direction and a protrusion for preventing rotation in the axial direction. The shock absorbing rubber mounting structure for an electromagnetic clutch according to claim 3, characterized in that it is adapted to engage with a recess having a corresponding shape on the surface.