JPH0247801Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulley device that is attached to the rotor shaft of a generator driven via a belt and the output shaft of an engine such as an automobile.

The rotation of the output shaft of the engine tends to fluctuate, especially when the output is in a low rotation range. On the other hand, the rotor shaft of the generator is equipped with an inertial body or the like so that it always rotates at a constant rate. For this reason, an alternating slip phenomenon occurs between the belt and the pulley, which is passed between the pulleys provided on the output shaft and the rotor shaft of the engine, and this disadvantageously shortens the life of the belt significantly. The object of the present invention is to obtain a pulley device free of such inconveniences.

In the present invention, a pulley is constituted by an outer member having a pulley groove biased to one side of the circumferential surface and an inner member inserted into the outer member, and the outer member and the inner member directly below the pulley groove of the pulley. A needle bearing is provided between the pulley groove, and the inner circumferential surface of the outer member displaced to the side of the pulley groove and the outer circumferential surface of the inner member opposing this are configured in a polygonal shape, and both polygons are The elastomers are provided offset in the circumferential direction, and prestressed elastomers are inserted into the vast spaces formed at a plurality of locations along the circumferential direction between both polygons.

An example of implementing the present invention will be explained with reference to the attached drawings.
In the drawing, 1 is an outer member 3 having a pulley groove 2 on its circumferential surface.
and an inner member 4 inserted into the outer member 3, and the pulley 1 has a pulley groove 2.
A needle bearing 5 is provided between the outer member 3 and the inner member 4 directly below the pulley groove 2, and the inner peripheral surface of the outer member 3 that is deviated to the side of the pulley groove 2 and the outer periphery of the inner member 4 that opposes this. The elastomer 7, which is prestressed, is inserted into a plurality of spaces 6 in the circumferential direction formed between the two polygons by shifting the corners of the polygons in the circumferential direction. It consists of

To explain this in detail, the inner peripheral surface of the outer member 3 and the outer periphery of the inner member 4 are connected to each other by leaving a flange 8 projecting in the inner diameter direction on the polygonal side surface of the outer member 3 immediately below the pulley groove 2. An annular needle bearing 5 insertion space is formed in between, and after the needle bearing 5 is installed in the insertion space, the inner and outer members 4 and 3 on the opposite side with the needle bearing 5 between the collar 8 and the needle bearing 5 are inserted. C
A ring 9 was applied to prevent the needle bearing 5 from falling off.

The inner circumferential surface of the outer member 3 that is offset to the side of the pulley groove 2 and the outer circumferential surface of the inner member 4 that opposes this have a slightly larger diameter than the mounting portion of the needle bearing 5. It is formed into a regular hexagon, and both regular hexagons are shifted in the circumferential direction to form six spaces 6 between them, and the elastomer 7 is applied to the spaces 6.

In the drawings, reference numeral 11 indicates an insertion hole 1 provided in the inner member 4.
0 shows the rotor shaft inserted.

In this case, even when a V-belt or other belt is stretched around the pulley 1 on the rotating shaft on the load side, the outer member 3 is moved by the needle bearing 5 interposed directly under the belt groove 2. Therefore, it does not move in the radial direction with respect to the inner member 4, and fluctuations in the rotation of the engine crankshaft are suppressed by the elastomer 7 inserted with prestress in the space formed between both polygons. Absorbed.

Therefore, it is possible to prevent an alternating slip phenomenon between the outer member 3 provided with the pulley groove 2 and the drive belt.

In this way, according to the present invention, the pulley is constituted by an outer member having a pulley groove biased to one side on the circumferential surface and an inner member inserted into the outer member, and the pulley is formed directly below the pulley groove of the pulley. Since a needle bearing is provided between the outer member and the inner member, the outer member will not be displaced in any direction other than the circumferential direction with respect to the inner member due to the tension applied to the belt. The inner circumferential surface of the outer member that is deviated to Since multiple prestressed elastomers are inserted into the huge voids formed at multiple locations along the There is no loss of function, and since the elastomer is only inserted between the outer member and the inner member, at the beginning of the relative movement between the two members, the relationship between the two members and the elastomer is In addition to being able to obtain a relatively large torsion angle in between, the elastomer is subjected to compressive force in the latter stages of relative motion, so it can handle excessive torque, thereby absorbing rotational fluctuations of the engine crankshaft. There are several effects that can be achieved.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a side view, and FIG. 2 is a sectional view taken along the line -2. 1... Pulley, 2... Pulley groove, 3... Outer member, 4... Inner member, 5... Needle bearing, 6... Blank space, 7... Elastomer.

Claims (1)

[Scope of utility model registration request] A pulley is constituted by an outer member having a pulley groove biased to one side on the circumferential surface and an inner member inserted into the outer member, and between the outer member and the inner member directly below the pulley groove of the pulley. Along with applying needle bearings,
The inner circumferential surface of the outer member that is offset to the side of the pulley groove and the outer circumferential surface of the inner member that opposes this are configured in a polygonal shape, and both polygons are provided offset in the circumferential direction. A pulley device for a generator, in which multiple prestressed elastomers are inserted into vast spaces formed at multiple locations along the circumferential direction between polygons.