JP3440955B2 - damper - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper, and more particularly, to a damper mounted on a rotary drive system such as an automobile engine.
The present invention relates to a torsional damper that suppresses vibration generated in a rotating shaft such as a crankshaft. 2. Description of the Related Art Conventionally, a mass has been connected to a hub via an elastic body to form a kind of resonance system to absorb torsional vibration generated in a rotating shaft having a fixed hub. Although a torsional damper for suppressing the vibration is known, there is a problem that an elastic body formed of a rubber-like elastic material generates heat due to repetition of elastic deformation during operation, so that the elastic body is damaged early. Conventionally, there is a torsional damper in which a passage is formed of a hole or a groove in the elastic to cool the elastic, and the surrounding air is passed through the passage during rotation. (See Japanese Utility Model Laid-Open No. 5-27244),
This type of external air-cooled damper has a problem that the cooling effect is sometimes insufficient because the cooling effect largely depends on the ambient temperature. [0004] In view of the above, the present invention has been made to provide a damper capable of exerting a sufficient cooling effect without having its cooling effect largely dependent on the ambient temperature. Aim. [0005] In order to achieve the above object, a damper according to the present invention is a damper comprising a mass connected to a hub via an elastic body. And a one-way circulation pump is provided in the circulation channel, and a cooling medium is filled. A circulation flow path is provided inside the hub or the mass body, and the circulation flow path is filled with a cooling medium, and the elastic body is cooled by the inherent cooling medium without largely depending on the ambient temperature. The cooling medium is circulated in the circulation channel by the operation of a one-way circulation pump provided in the circulation channel. Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a mass body 3 is connected to an outer peripheral side of a hub 1 via an elastic body 2, and a plurality of elastic body cooling units 4 are provided inside the mass body 3 in an evenly distributed manner. (In the figure, four are equally distributed, two of which are drawn in cross-section). The hub 1 and the mass body 3 are each formed into an annular shape with a predetermined metal, and the elastic body 2 is formed into an annular shape with a predetermined rubber-like elastic material, and is press-fitted between the hub 1 and the mass body 3 with a predetermined interference. ing. The elastic body cooling section 4 has a circulation flow path 5 for circulating the inside of the mass body 3 from the inner periphery to the outer periphery and from the outer periphery to the inner periphery. The one-way circulating pump 6 is provided at one position in the middle of the circulation flow path 5, and is disposed in a plane.
Is filled with a cooling medium 7. As shown in FIG. 2, the one-way circulating pump 6 has pump chambers 8 communicating with the circulation channel 5 at both ends in the longitudinal direction thereof. The valve body 10 is movably inserted. The weight 9 is basically cylindrical, and is provided with a tapered valve seat 9b at one end of a hollow portion 9a. The valve element 10 is a ball valve that can be seated on the valve seat 9b. In the damper having the above structure, the hub 1 is fixed to a rotating shaft (not shown) to form a kind of resonance system to absorb and suppress torsional vibration generated in the rotating shaft. When the elastic body 2 generates heat, a part of this heat is transmitted to the mass body 3, causing the mass body 3 to have a relatively high temperature at its inner peripheral portion and a relatively low temperature at its outer peripheral portion. Heat is quickly transferred to the outer periphery by the cooling medium 7 circulating in the circulation channel 5. Accordingly, the elastic body 2 can be efficiently cooled, and the durability of the elastic body 2 can be improved. The one-way circulation pump 6 moves the weight 9 and the valve body 10 in the pump chamber 8 by the whirling of the mass body 3 caused by the torsional vibration as described below, whereby the cooling medium 7 is moved in one direction. Circulate. That is, first, when the mass body 3 swings to one side, the weight 9 at the left end of the pump chamber 8 in FIG.
Moves to the right end as shown in FIG. At this time, the valve element 10 is still seated on the valve seat 9a, so that the valve element 10 is pressed by the weight 9 and the valve element 10 so that the cooling medium 7 is pressed by the weight 9 and the valve element 10 in order to suppress the backflow of the cooling medium 7. Flow in the direction (arrow A). Next, when the mass body 3 swings to the other side,
The weight 9 at the right end of the pump chamber 8 in FIG. 3 returns to the right end as shown in FIGS. 4 and 5, but at this time, the valve element 10 causes the relative flow of the cooling medium 7 (as indicated by arrows). B) is not restrained. The valve body 10 returns later than the weight 9. Therefore, by repeating this operation, the cooling medium 7
Can be circulated in one direction. The damper to which the present invention is applied is not limited to a fitting type damper in which the elastic body 2 is press-fitted between the hub 1 and the mass body 3, but may be a bush type or disk type damper. The number of the elastic cooling units 4 is not limited. Further, the elastic body cooling section 4 may be provided on the hub 1 or on both the mass body 3 and the hub 1. When the elastic body cooling unit 4 is provided in the hub 1, the one-way circulation pump 6 moves the weight 9 and the valve body 10 directly by torsional vibration. Since the purpose of the circulation channel 5 is to cool the elastic body 2, it is important that the circulation passage 5 pass through a relatively high temperature part and a relatively low temperature part near the elastic body 2. In addition, the cooling effect can be further enhanced by forming the circulation flow path 5 into a shape such as a waveform that can take as large a surface area as possible. By using a liquid having a high temperature gradient as the cooling medium 7, the cooling effect can be further enhanced. The present invention has the following effects. That is, a circulation flow path is provided inside the hub or the mass body, and a one-way circulation pump is provided in the circulation flow path and the cooling medium is filled. An elastic body can be cooled, and a damper exhibiting a sufficient cooling effect can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view of a damper according to an embodiment of the present invention. FIG. 2 is an enlarged view of a one-way circulation pump. FIG. FIG. 4 is a diagram illustrating the operation of the one-way circulation pump. FIG. 5 is a diagram illustrating the operation of the one-way circulation pump. [Description of References] 1 hub 2 elastic body 3 mass body 4 elastic body cooling unit 5 circulation channel 6 one-way circulation pump 7 Cooling medium 8 Pump chamber 9 Weight 9a Hollow part 9b Valve seat 10 Valve body

Claims (1)

(57) Claims 1. A damper comprising a mass (3) connected to a hub (1) via an elastic body (2), wherein the hub (1) or the mass ( Circulation flow path (5) inside 3)
And a one-way circulation pump (6) is provided in the circulation flow path (5).
And a cooling medium (7).