JPH0635700U - damper - Google Patents

Abstract

(57) [Abstract] [Purpose] For a disk-type dynamic damper in which three parts of a hub 1, an elastic body 3 and a mass body 2 are arranged in an axial direction, the elastic body 3 is used in a compressed state. Improve the durability of the body 3. [Structure] Cylindrical portion 1a of hub 1 and axial portion 2 of mass body 2
An eccentricity prevention member 4 is interposed between a and the hub 1 and the mass body 2 are axially positioned relative to each other to keep the elastic body 3 compressed in the axial direction.

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 propeller shaft.

[0002]

[Prior art]

 Conventionally, as one type of damper, a disk-type dynamic damper (also called Tillger) in which three parts of a hub, an elastic body and a mass body are arranged in the axial direction has been known. Since the elastic body made of an elastic material cannot be used in a compressed state, there is a problem that the elastic body deteriorates early.

[0003]

[Problems to be solved by the device]

 In view of the above points, the present invention was devised for the purpose of improving the durability of the elastic body of the disk type dynamic damper.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, a damper of the present invention comprises a hub having a flange portion radially outwardly provided at one axial end of a cylindrical portion and an annular axial portion spaced apart from the outer peripheral side of the hub. An annular radial portion is provided at one end in the axial direction toward the inner side in the radial direction, and a mass body in which the radial portion is opposed to the flange portion in the axial direction with a gap, and between the flange portion and the radial portion. An elastic body interposed and an eccentricity prevention member interposed between the cylindrical portion and the axial portion, wherein the hub and the mass body are axially positioned with respect to each other, and the elastic body Is axially compressed.

[0005]

[Action]

 In the prior art, it was not possible to use the elastic body in a compressed state because the hub and the mass body connected via this elastic body are axially opposed to each other within a range in which the elastic body can elastically deform. This is because they were movable and were not axially positioned with respect to each other with the elastic body compressed in the axial direction. On the other hand, according to the present invention, since the eccentricity prevention member is interposed between the cylindrical portion of the hub and the axial portion of the mass body and the hub and the mass body are axially positioned relative to each other, the elastic It is possible to keep the body axially compressed.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the damper has four parts including a hub 1, a mass body 2, an elastic body 3 and an eccentricity prevention member 4.

The hub 1 is formed into an annular shape by sheet metal, and has a flange portion 1b provided at one axial end (the right end in the drawing) of the cylindrical portion 1a and radially outward (upward in the drawing). An inward flange portion 1c is provided radially inward (downward in the drawing) at the other axial end (left end in the drawing) of the cylindrical portion 1a. The mass body 2 is formed into an annular shape by cast iron, and an annular radial portion 2b is provided radially inward at one axial end of an annular axial portion 2a that is spaced apart from the outer peripheral side of the hub 1. The radial portion 2b is axially separated and opposed to the flange portion 1b of the hub 1. Further, an annular step portion 2c for positioning when the eccentricity prevention member 4 is fitted is provided on the inner peripheral surface of the axial portion 2a. The elastic body 3 is formed in an annular shape by a rubber-like elastic material, and is interposed between the flange portion 1b of the hub 1 and the radial portion 2b of the mass body 2. Simultaneously with molding, the elastic body 3 is vulcanized and adhered to the flange portion 1b and the radial portion 2b. The eccentricity prevention member 4 is a ball bearing, and has an inner race 4a fitted to the outer circumference of the cylindrical portion 1a of the hub 1, and an outer race 4b fitted to the inner circumference of the axial portion 2a of the mass body 2. It has a large number of balls 4c sandwiched between both races 4a and 4b so as to be rollable.

In the damper having the above structure, when the elastic body 3 is molded by a mold (not shown), the hub 1 and the mass body 2 are inserted into the mold to perform so-called insert molding. A vulcanization molded product in which the three parts 1, 2 and 3 are integrated is molded as shown in FIG. At this time, the length of the elastic body 3 in the axial direction is L. Next, an eccentricity prevention member 4 is interposed between the hub 1 and the mass body 2, that is, the inner race 4a is fitted on the outer circumference of the cylindrical portion 1a and the outer race 4c is fitted on the inner circumference of the axial portion 2a. At this time, the hub 1 and the mass body 2 are positioned at positions axially displaced from each other so that the elastic body 3 is axially compressed (L '<L). Therefore, the elastic body 3 can be kept in a compressed state by this, and the durability of the elastic body 3 can be improved.

The eccentricity prevention member 4 may be a low-friction resin member as shown in FIG. 3, and in this case, the other end in the axial direction of the axial portion 2a of the mass body 2 (the left end in the figure). Secure the retaining member 5 to.

[0010]

[Effect of device]

 The present invention has the following effects. That is, because an eccentricity prevention member was interposed between the cylindrical portion of the hub and the axial portion of the mass body, the hub and the mass body were axially positioned with respect to each other so that the elastic body was kept in the axially compressed state. In addition, the durability of the elastic body can be improved.

[Brief description of drawings]

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

FIG. 2 is a half-cut sectional view showing a state where the damper is being assembled.

FIG. 3 is a half sectional view of a damper according to another embodiment of the present invention.

[Explanation of symbols]

 1 hub 1a cylindrical part 1b flange part 1c inward flange part 2 mass body 2a axial direction part 2b radial direction part 2c step part 3 elastic body 4 eccentricity prevention member 4a inner race 4b outer race 4c ball 5 retaining member

Claims (1)

[Scope of utility model registration request] 1. A hub (1) having a flange portion (1b) radially outwardly provided at one axial end of a cylindrical portion (1a),
An annular radial portion (2b) is provided at one axial end of the annular axial portion (2a) spaced apart from the outer peripheral side of the hub (1), and the annular radial portion (2b) is provided radially inward, and the radial portion (2b). Mass body (2) in which the flange part (1b) is axially separated and opposed to
And an elastic body (3) interposed between the flange portion (1b) and the radial portion (2b), and between the cylindrical portion (1a) and the axial portion (2a). An eccentricity prevention member (4), and the hub (1) and the mass body (2).
Are positioned axially relative to each other, and the elastic body (3) is axially compressed.