JPH0542793U - damper - Google Patents

Abstract

(57) [Abstract] [Purpose] For a fitting type damper in which an elastic body 6 is press-fitted between the hub 1 and the mass body 2, a slip phenomenon occurs between the elastic body 6 and the hub 1 or the elastic body 6 and the mass body 2. To improve the durability of the damper. [Structure] The elastic body 6 has a three-layer structure, and the SB of the center layer 7 is
SBR on the inner and outer sides of R or NBR respectively
Alternatively, a rubber having a hardness lower than that of NBR is arranged, and the rubber is compressed in the radial direction to be strongly adhered to the hub 1 or the mass body 2. Further, rubbers which are more likely to cause permanent strain than SBR or NBR are arranged on the inner peripheral side and the outer peripheral side of the SBR or NBR of the central layer 7, respectively. In addition, the SBR or NBR of the central layer 7 has SBR or N on the inner and outer circumference sides, respectively.
Place rubber that is more tacky than BR.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improved damper. The damper of the present invention is mounted on a rotary drive system of an automobile or various industrial machines, and is used as a torsional damper for damping torsional vibration generated on a rotary shaft such as a crankshaft.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 3, a fitting type torsional damper in which an elastic body 3 is press-fitted between a hub 1 and a mass body 2 is known. The hub 1 and the mass body 2 are each formed of a predetermined metal into an annular shape, and the elastic body 3 is formed of a predetermined rubber into an annular shape. In particular, SBR or NBR is used for this rubber. Further, in order to prevent the elastic body 3 from slipping out in the axial direction, an annular mountain portion 4 and an annular valley portion 5 are provided in the facing portion of the hub 1 and the mass body 2 so as to face each other.

[0003]

[Problems to be solved by the device]

 The mating type torsion damper has a smaller number of parts and assembling steps than the disk type or bush type torsion damper, and therefore has an advantage of being inexpensive. However, unlike the disc type or bush type, the mating type torsion damper does not vulcanize and bond the elastic body 3, so that when the high torque is applied or the elastic body 3 is settled. At that time, a sliding phenomenon occurred between the elastic body 3 and the hub 1 or between the elastic body 3 and the mass body 2, resulting in deterioration of durability.

[0004]

[Means for Solving the Problems]

 In view of the above points, the present invention has been devised in order to solve the problems found in the above-mentioned prior art, and in order to achieve this object, as described in claim 1, between the hub and the mass body, In the damper in which the elastic body is press-fitted in, the elastic body has a three-layer structure, the central layer of the three-layer structure is SBR or NBR, and the inner and outer layers of the three-layer structure are respectively Provided is a damper characterized by being a rubber having a hardness lower than that of SBR or NBR. In a damper in which an elastic body is press-fitted between the hub and the mass body, the elastic body has a three-layer structure, and the central layer of the three-layer structure is SBR or NBR. The present invention provides a damper, wherein the inner and outer layers of the three-layer structure are rubbers that are more susceptible to permanent strain than the SBR or NBR. In a damper in which an elastic body is press-fitted between the hub and the mass body, the elastic body has a three-layer structure, and the central layer of the three-layer structure is SBR or NBR. And a damper having an inner peripheral side and an outer peripheral side layer of the three-layer structure made of rubber having higher adhesiveness than the SBR or NBR, respectively.

[0005]

[Action]

 When the rubber having a hardness lower than that of SBR or NBR is arranged on the inner peripheral side and the outer peripheral side of the SBR or NBR with the elastic body having a three-layer structure, the rubber is compressed in the radial direction. Firmly adhere to the hub or mass. Therefore, it is possible to prevent the sliding phenomenon between the elastic body and the hub or between the elastic body and the mass body. Further, as in claim 2, when rubbers which are more likely to cause permanent strain than SBR or NBR are arranged on the inner and outer circumference sides of the SBR or NBR, respectively, the rubber is well fitted to the surface of the hub or mass. If it becomes hard and there are irregularities on the surface of the hub or mass, it will engage with the irregularities. Therefore, it is possible to prevent the sliding phenomenon between the elastic body and the hub or the elastic body and the mass body. When rubber having higher adhesiveness than SBR or NBR is arranged on the inner peripheral side and the outer peripheral side of SBR or NBR, respectively, the rubber adheres to the hub or the mass body. Therefore, it is possible to prevent the slip phenomenon from occurring in the elastic body and the hub or the elastic body and the mass body.

[0006]

【Example】

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

First Embodiment As shown in FIGS. 1 and 2, the elastic body 6 is press-fitted between the hub 1 and the mass body 2 to form a fitting type torsion damper, and the elastic body 6 is It has a three-layer structure in the radial direction, the center layer 7 is formed by the same SBR or NBR as the conventional one, and the inner and outer layers 8, 9 are made of rubber having a hardness lower than that of SBR or NBR, respectively. It is molded. The type of rubber does not matter. Thus, according to this configuration, the rubbers of the layers 8 and 9 on the inner peripheral side and the outer peripheral side are respectively compressed in the radial direction and strongly adhere to the hub 1 or the mass body 2. Alternatively, it is possible to prevent the slip phenomenon from occurring between the elastic body 6 and the mass body 2.

Second Embodiment As shown in FIGS. 1 and 2, the elastic body 6 is press-fitted between the hub 1 and the mass body 2 to form a fitting type torsion damper, and the elastic body 6 is It has a three-layer structure in the radial direction, the center layer 7 is made of SBR or NBR, and the inner and outer layers 8, 9 are made of rubber that is more likely to cause permanent set than SBR or NBR, respectively. Are molded. Examples of rubbers are natural rubber, chloroprene rubber or polynorbornene rubber. Thus, according to this configuration, the rubber of the layers 8 and 9 on the inner peripheral side and the outer peripheral side becomes hard in a state of being well fitted to the surface of the hub 1 or the mass body 2, respectively, and the rubber on the surface of the hub 1 or the mass body 2 becomes When there is unevenness, it is possible to prevent the sliding phenomenon between the elastic body 6 and the hub 1 or the elastic body 6 and the mass body 2 due to the engagement with the unevenness. The outer peripheral surface of the hub 1 and the inner peripheral surface of the mass body 2 are each provided with fine irregularities (not shown) by shot processing or the like.

Third Embodiment As shown in FIGS. 1 and 2, the elastic body 6 is press-fitted between the hub 1 and the mass body 2 to form a fitting type torsional damper. It has a three-layer structure in the radial direction, the center layer 7 is formed by SBR or NBR, and the inner and outer layers 8, 9 are formed by rubber having higher adhesiveness than SBR or NBR, respectively. Has been done. An example of rubber is polynorbornene rubber. Thus, according to this structure, the rubbers of the layers 8 and 9 on the inner peripheral side and the outer peripheral side adhere to the hub 1 or the mass body 2, respectively, so that the elastic body 6 and the hub 1 or the elastic body 6 and the mass body 2 are attached. It is possible to prevent the slip phenomenon from occurring on the surface.

In common with each of the embodiments, the SBR or NBR of the central layer 7 and the rubbers of the inner and outer peripheral layers 8 and 9 are integrated. The molding method is any of the following. a. The SBR or NBR of the central layer 7 is vulcanized, and the rubber material for the inner and outer peripheral layers 8 and 9 is applied to the inner and outer peripheral surfaces of the molded product obtained by the vulcanization, and then vulcanized again. .. b. A semi-vulcanized rubber ring is molded for each of the three layers, and the rubber rings are combined and revulcanized. c. The SBR or NBR of the center layer 7 is vulcanized, and the inner peripheral surface and the outer peripheral surface of the molded product obtained by the vulcanization are coated with rubber paste or coated by dipping or the like to carry out secondary vulcanization.

[0011]

[Effect of the device]

 The present invention has the following effects. That is, according to claim 1, since the rubber having a hardness lower than that of SBR or NBR is arranged on the inner peripheral side and the outer peripheral side of the SBR or NBR with the elastic body having a three-layer structure, the rubber is compressed in the radial direction and the hub is compressed. Or strongly adhere to the mass body. Further, according to claim 2, since rubbers, which are more likely to cause permanent strain than SBR or NBR, are arranged on the inner peripheral side and the outer peripheral side of the SBR or NBR, respectively, the rubber is well adapted to the surface of the hub or the mass body. When the hub or mass body has a concave or convex surface, it becomes hard and engages with the concave or convex portion. Further, according to claim 3, since rubber having a higher adhesiveness than SBR or NBR is arranged on the inner peripheral side and the outer peripheral side of the SBR or NBR, the rubber adheres to the hub or the mass body. Therefore, it is possible to prevent the sliding phenomenon between the elastic body and the hub or the elastic body and the mass body due to these actions, and improve the durability of the damper.

[Brief description of drawings]

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

FIG. 2 is a sectional view of an essential part of an elastic body.

FIG. 3 is a half-cut sectional view of a damper according to a conventional example.

[Explanation of symbols]

 1 hub 2 mass body 3,6 elastic body 4 mountain part 5 valley part 7 central layer 8 inner peripheral layer 9 outer peripheral layer

Claims (3)

[Scope of utility model registration request] 1. A damper in which an elastic body 6 is press-fitted between a hub 1 and a mass body 2, wherein the elastic body 6 has a three-layer structure,
The center layer 7 of the three-layer structure is SBR or NBR, and the inner and outer layers 8, 9 of the three-layer structure are rubbers having hardness lower than that of the SBR or NBR, respectively. damper. 2. A damper in which an elastic body 6 is press-fitted between a hub 1 and a mass body 2, wherein the elastic body 6 has a three-layer structure,
The center layer 7 of the three-layer structure is SBR or NBR, and the inner and outer layers 8 and 9 of the three-layer structure are rubbers that are more susceptible to permanent set than the SBR or NBR, respectively. Damper to be. 3. A damper having an elastic body 6 press-fitted between a hub 1 and a mass body 2, wherein the elastic body 6 has a three-layer structure,
The center layer 7 of the three-layer structure is SBR or NBR, and the inner and outer layers 8, 9 of the three-layer structure are rubbers having higher adhesiveness than the SBR or NBR, respectively. Damper to do.