JPH05209651A - Damper pulley - Google Patents

Abstract

PURPOSE:To make a self-heating element very small and improve the damper performance and durability by fitting a damper mass on the outer periphery of a hub via a metal lattice body, and providing a damper mass drop preventing means at least on one side of the hub. CONSTITUTION:A hub 10 is a stepped cylinder section constituted of a large- diameter cylinder section 11 and a small-diameter cylinder section 12. The hub 10 is fixed to the crank shaft end of an engine, for example, at the small- diameter cylinder section 12. A flange section 11a is formed on the left end face of the large-diameter cylinder section 11 of the hub 10, a metal bearing 40 brought into contact with it is outwardly coupled with the cylinder section 11, and a damper mass 20 is coupled with its outer periphery. Projections 20c... protruded inward in the radial direction are protruded on the damper mass 20, and space sections A are formed between the projections 20c... and projections 12a... protruded on the outer periphery of the hub 10. Metal fine wires such as stainless steel wires are braided into a mesh shape in the space sections A, a metal lattice body 30 compression-molded into the preset shape at high density is pressed in, and a drop preventing means G is provided on the right end face of the hub 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper pulley, and more particularly to a damper pulley mounted on the shaft end of a crankshaft of an automobile engine.

[0002]

2. Description of the Related Art A damper pulley in which a damper mass is attached to a hub via a rubber-like elastic body made of vibration-proof rubber is
For example, it is attached to the crankshaft shaft end of an automobile engine and transmits rotational power to auxiliary machinery such as an air conditioner compressor and a power steering pump.
Vibration generated in the crankshaft during engine operation can be absorbed by the cooperative action of the damper mass and the rubber-like elastic body.

[0003]

However, in the above-mentioned damper pulley, the rubber-like elastic body self-heats due to vibration during engine operation. In particular, since the exciting force in the high-speed rotation range of the engine increases in proportion to the square of the engine speed, the self-heating of the rubber-like elastic body rapidly increases, and the performance and life of the rubber-like elastic body are increased. There was a fear that it would have a bad effect. Furthermore, since the damper pulley is usually used in an environment with severe temperature conditions, if the temperature rises abnormally, the rubber-like elastic body begins to soften, and if the shape is no longer maintained, the damper mass will be removed from the hub. There was a risk of falling out.

The present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to:
An object of the present invention is to provide a damper pulley that can sufficiently cope with the environment under severe temperature conditions and can prevent the damper mass from falling off.

[0005]

In order to achieve the above object, in the damper pulley of the present invention, a damper mass is attached to the outer periphery of the hub through a metal body, and the damper mass is prevented from falling off on at least one side of the hub. It is characterized by the provision of means.

[0006]

In the damper pulley according to the present invention, the rubber-like elastic body is replaced by a metal body made of a metal material having extremely small temperature dependence, so that the damper pulley can sufficiently cope with the environment under severe temperature conditions. it can.

Further, the damper mass falling-off preventing means can prevent the damper mass from falling off from the hub.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

1 and 2 relate to a first embodiment of the present invention. FIG. 1 is a sectional front view of a damper pulley, and FIG. 2 is a sectional view taken along the line II-II of FIG.

In the figure, E is a damper pulley, and a damper mass 2 is provided on the outer periphery of the hub 10 with a metal casing 30 interposed therebetween.
0 is mounted, and a damper mass dropout prevention means G is provided on at least one side of the hub 10.

Next, the structure of the first embodiment of the present invention will be described in more detail.

The damper pulley E includes a hub 10, a damper mass 20, and a metal casing 30. Hub 10
Is a stepped cylindrical portion, which is composed of a large-diameter cylindrical portion 11 and a small-diameter cylindrical portion 12, and the small-diameter cylindrical portion 12 is fixed to a rotary shaft, for example, a crankshaft shaft end of an automobile engine. A flange portion 11a is formed on the left end surface of the large-diameter cylindrical portion 11 so as to project outward in the radial direction, and the metal bearing 40 with the flange portion 40a is provided so as to contact the inner surface of the flange portion 11a. It is inserted on the outer peripheral surface. In addition, on the outer peripheral surface of the small-diameter cylindrical portion 12, a plurality of, for example, four protrusions 12a having a substantially fan-shaped cross section that protrudes outward in the radial direction from a connecting portion with the large-diameter cylindrical portion 11 to an intermediate portion.
Are formed at equal intervals along the circumferential direction.

The damper mass 20 is formed in a cylindrical shape, and a through hole 20a capable of accommodating each of the protrusions 12a of the hub 10 with a gap a on its axis and the through hole 20a.
The recess 20b is formed in communication with the. This recess 20
The left end surface b of the metal bearing 40 is inserted into the flange portion 40a of the metal bearing 40, and the bottom surface of the recess 20b is arranged with a right end surface of the cylindrical portion 11 with a gap b. Further, in the through hole 20a, a plurality of, for example, four protrusions 20c having a substantially trapezoidal cross-section that protrude inward in the radial direction are formed at equal intervals along the circumferential direction, and each protrusion 20c is a hub. It is arranged so as to face the middle portion of each of the protrusions 12a of the ten.

The metal casing 30 is press-fitted into each space portion A formed by each protrusion 12a of the hub 10 and each protrusion 20c of the damper mass 20. The metal case 30 is a thin metal wire, for example, a wire diameter of 0.25 mm.
The stainless steel wire is woven and woven into a mesh shape, and then compression-molded to a required shape density.

A metal bearing 41 is fitted on the outer peripheral surface of the cylindrical portion 12 on the right end surface side of the damper mass 20, and the metal bearing 41 is fixed to the cylindrical portion 12 by a press-fitting ring 42. It is pressed against the right end face of 20.

In the above structure, the metal bearing 4
The flange portion 11a of the hub 10 and the press-fitting ring 42, which are respectively arranged via the holes 0 and 41, constitute a damper mass drop-out preventing means G.

The damper pulley E constructed as described above has a structure in which the torsional vibration generated in the crankshaft is absorbed by the cooperative action of the damper mass 20 and the metal casing 30, and the damper mass 20 is a hub. It is necessary to freely vibrate 10 through the metal casing 30.

By the way, in the damper pulley E according to this embodiment, since the metal casing 30 is simply press-fitted, the damper mass 20 is free in the radial direction and the axial direction. Therefore, in order for the damper 20 to move relative to the hub 10 and to generate rotational vibration, the metal bearings 40, 4
1 is provided. That is, the metal bearing 40
To regulate the radial movement of the damper mass 20,
The metal bearings 41 are each configured to regulate the axial movement of the damper mass 20.

Next, the operation of the first embodiment of the present invention will be described.

In the damper pulley E constructed as described above, even if the damper mass 20 tries to move toward the front side of the vehicle body (in the direction of arrow F) opposite to the engine side, the movement is the flange portion 40 of the metal bearing 40.
It is regulated by contacting a. by this,
It is possible to prevent the damper mass 20 from falling off in the arrow F direction. Further, even if the damper mass 20 tries to move to the engine side (arrow R direction), the movement is restricted by contacting the metal bearing 41. As a result, the damper mass 20 can be prevented from falling off in the arrow R direction.

Further, the metal casing 30 is press-fitted into the space A, and the wire mesh spring 30 is always compressed when the engine is operating. As a result, it is possible to firmly hold the knitting and weaving of the wires that are entangled with each other due to the plastic deformation accompanying the compression. Further, since the metal structure 30 has excellent vibration damping performance due to the elasticity of the metal wire itself and the friction between the metal wires, the vibration generated in the crankshaft during engine operation can be significantly reduced. At this time, the metal ring 4 is placed between the hub 10 and the damper mass 20.
0 and the metal casing 30 are arranged and the hub 10 and the damper mass 20 do not come into direct contact with each other, so that there is no possibility of lowering the vibration damping performance at all. Moreover, since the material of the metal case 30 is a metal, the dependence on the temperature is extremely small, which makes it possible to sufficiently cope with it even under a severe temperature environment.

FIG. 3 is a sectional explanatory view corresponding to FIG. 2 according to a modification of the first embodiment of the present invention.

In this modification, a plurality of roller bearings 43, for example, eight roller bearings 43 instead of the metal bearing 40 shown in the first embodiment are replaced by eight instead of the metal bearing 41.
Individual roller bearings 44 are provided at equal intervals in the circumferential direction via spacers (not shown).

The other structure and operation are the same as those shown in the first embodiment, and detailed description thereof will be omitted.

4 and 5 relate to the second embodiment of the present invention, FIG. 4 is a front sectional view of the damper pulley, and FIG. 5 is a sectional view taken along the line V--V of FIG.

The damper pulley E according to the second embodiment
Includes a hub 10A, a damper mass 20A, and a metal casing 30A. The hub 10A is formed in a cylindrical shape, and is fixed to the crankshaft shaft end of the automobile engine as in the first embodiment. Further, a plurality of, for example, four protrusions 10a having a substantially fan-shaped cross section are formed at the same interval along the circumferential direction in the intermediate portion of the outer peripheral surface of the hub 10A.

The damper mass 20A is formed in a cylindrical shape, and a through hole 20d for accommodating each protrusion 10a of the hub 10A is formed on the axis of the damper mass 20A with a gap d. In addition, a plurality of, for example, four protrusions 20e each having a substantially trapezoidal cross section and protruding inward in the radial direction are formed in the middle portion of the through hole 20d at equal intervals along the circumferential direction. The portions 20e are arranged so as to face the intermediate portions of the protrusions 10a of the hub 10A.

The metal casing 30A is press-fitted into the space B formed by the protrusions 10a of the hub 10A and the protrusions 20e of the damper mass 20A.

The ball bearings 43, 44 are provided in the space C formed on the left and right sides of the hub 10A by the outer peripheral surface of the hub 10A and the through holes 20d of the damper mass 20A.
Are press-fitted through ring-shaped plates 45, and the ball bearing 43 on the left side has its left side surface,
The hub 10A is disposed so as to be aligned with the left end surface of the hub 10A, and is also disposed so as to be in contact with the right side surface of the snap ring 46 provided in the through hole 20d of the damper mass 20A. Further, the right side ball bearing 44 is arranged such that its right side surface is in contact with the left side surface of the snap ring 47 provided in the through hole 20d of the damper mass 20A.

In this second embodiment, the damper mass 20A
The snap rings 46 and 47 provided via the ball bearings 43 and 44, respectively, constitute the damper mass drop-out preventing means G, and the other construction and operation are substantially the same as those shown in the first embodiment. Therefore, detailed description thereof will be omitted.

In each of the above-described embodiments, the damper mass dropout prevention means G is provided on both sides of the hub 10, 10A, but it may be provided only on the F side.

[0032]

As described above, in the damper pulley of the present invention, the rubber elastic body is replaced by a metal body made of a metal material having extremely minute temperature dependence, so that it can be used under severe temperature conditions. Can cope well. Further, the damper mass fall-off preventing means can prevent the damper mass from falling off the hub.

[Brief description of drawings]

FIG. 1 is a front cross-sectional explanatory view of a damper pulley according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional explanatory view corresponding to FIG. 2 according to a modification of the first embodiment of the present invention.

FIG. 4 is a front cross-sectional explanatory view of a damper pulley according to a second embodiment of the present invention.

5 is a cross-sectional view taken along the line VV of FIG.

[Explanation of symbols]

 E Damper Pulley G Damper Mass Fallout Prevention Means 10 Hub 10A Hub 10a Projection 12a Projection 20 Damper Mass 20A Damper Mass 20c Projection 20e Projection 30 Metal Body 30A Metal Body 40 Metal Bearing 41 Metal Bearing 42 Press-fit Ring 43 Ball Bearing 44 Ball bearing 46 Snap ring 47 Snap ring

Claims (1)

[Claims] 1. A damper pulley characterized in that a damper mass is attached to the outer circumference of a hub via a metal body, and a damper mass dropout prevention means is provided on at least one side of the hub.