JPH0635702U - damper - Google Patents

Abstract

(57) [Abstract] [Purpose] With respect to the damper in which the hub 1 and the mass body 2 are connected via the elastic body 3, the elastic body 3 is prevented from being damaged even if a large amplitude vibration is input in the torsion direction. To do. It also provides a stopper that does not generate a loud noise during operation. [Structure] The hub 1 and the mass body 2 are connected via a stopper 4 made of a flexible material in addition to the elastic body 3, and the relative rotation of the hub 1 and the mass body 2 is limited to a predetermined angle θ by the stopper 4. . The stopper 4 is, for example, a leaf spring.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a damper that is mounted on a rotary drive system of an automobile engine or the like and absorbs and damps vibrations generated on a rotary shaft such as a crankshaft.

[0002]

[Prior art]

 Conventionally, as shown in FIGS. 4 and 5, there is known a torsional damper in which a hub 1 and a mass body 2 are connected via an elastic body 3 made of a rubber-like elastic material. Is not provided with means for limiting the relative rotation of the hub 1 and the mass body 2 to a predetermined angle, the strain of the elastic body 3 will be reduced when a large amplitude vibration is input in the twisting direction (rotational direction). There is a possibility that the elastic body 3 may be damaged because it becomes too large.

[0003]

[Problems to be solved by the device]

 Therefore, the applicant of the present application first limits the relative rotation of both members 1 and 2 to a predetermined angle by erecting a plurality of sets of projections that engage in the twisting direction on the opposing surfaces of the hub 1 and the mass body 2. However, this damper has a problem in that a large impact noise is generated each time the protrusion abuts on the damper.

[0004]

[Means for Solving the Problems]

 In view of the above points, the present invention has been devised to solve the above-mentioned problems in the prior art, and in order to achieve this object, a damper in which a hub and a mass body are connected via an elastic body is used. The hub and the mass body are connected via a stopper made of a flexible material in addition to the elastic body, and the relative rotation of the hub and the mass body is limited to a predetermined angle by the stopper.

[0005]

[Action]

 The stopper is, for example, a leaf spring, and is interposed between the hub and the mass body in a state in which the stopper is slightly bent. That is, one end is connected to the hub and the other end is connected to the mass body. During operation, the hub and mass rotate relative to each other while the stopper is bent, but relative rotation is stopped when the stopper is fully extended. And this kind of stopper does not make a loud noise even when it is fully extended.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the hub 1 and the mass body 2 are connected via an elastic body 3 made of a rubber-like elastic material, and the hub 1 and the mass body 2 are connected to each other in addition to the elastic body 3. , The stoppers 4 made of a flexible material are connected so that the relative rotation angle between the members 1 and 2 is limited to a predetermined angle θ. The stopper 4 is a leaf spring that is freely deformable as shown in FIG. 2. The stopper 4 is interposed between the hub 1 and the mass body 2 in a state where the stopper 4 is slightly bent (state B in FIG. 2). That is, one end 4a thereof is connected to the hub 1 and the other end 4b thereof is connected to the mass body 2. A pair of stoppers 4 are provided in directions opposite to each other in the twisting direction, and the stoppers 4 on the left side of the figure limit the clockwise relative rotation of the mass body 2 with respect to the hub 1 to a predetermined angle θ ₁ in the figure. The stopper 4 on the upper right side limits the counterclockwise relative rotation of the mass body 2 with respect to the hub 1 to a predetermined angle θ ₂ (θ ₁ + θ ₂ = θ), and these stoppers 4 are bent during operation. The hub 1 and the mass body 2 rotate relative to each other, but when one of the stoppers 4 is fully extended (the state of FIG. 2A), the relative rotation of the hub 1 and the mass body 2 is stopped as shown in FIG. However, the direction of the stopper 4 may be opposite to the twisting direction so that the stopper 4 operates in the state of C in FIG. Therefore, even if a vibration having a large amplitude in the torsion direction is input, the strain of the elastic body 3 does not become too large, and it is possible to prevent the elastic body 3 from being damaged due to this. Further, unlike the prior art disclosed in the above publication, the pair of protrusions are not brought into contact with each other at the time of operation, so that a loud noise can be prevented from being generated.

The material of the stopper 4 is not particularly limited as long as there is no problem with respect to the input in the torsional direction in terms of tensile strength, and the means for connecting the stopper 4 to the hub 1 or the mass body 2 or the like is also adhered or welded. There are various types such as fitting, and there is no particular limitation. In the illustrated damper, one end 4a of the stopper 4 is connected to the sleeve 5 and the sleeve 5 is fitted to the outer periphery of the hub 1. However, the present invention does not matter whether the sleeve 5 is provided or not.

[0009]

[Effect of device]

 The present invention has the following effects. That is, since the hub and the mass body are connected via a stopper made of a flexible material in addition to the elastic body, and the relative rotation of the hub and the mass body is limited to a predetermined angle by this stopper, the hub is rotated in the twisting direction. Even if vibration with a large amplitude is input, the strain of the elastic body does not become too large, and it is possible to prevent the elastic body from being damaged due to this. Further, unlike the prior art disclosed in the above publication, the pair of protrusions are not brought into contact with each other at the time of operation, so that a loud noise can be prevented from being generated.

[Brief description of drawings]

FIG. 1 is a front view of a half cut of a damper according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a stopper

FIG. 3 is a half-cut front view showing the operation of the damper.

FIG. 4 is a half-cut front view of a damper according to a conventional example.

5 is a sectional view taken along line AA in FIG.

[Explanation of symbols]

 1 hub 2 mass body 3 elastic body 4 stopper 4a one end 4b other end 5 sleeve

Claims (1)

[Scope of utility model registration request] 1. A damper in which a hub (1) and a mass body (2) are connected via an elastic body (3), wherein the hub (1) and the mass body (2) are connected to the other elastic body (3). To the hub (1) and the mass body (2) by rotating the stopper (4).
A damper characterized by being limited to a predetermined angle (θ) by.