JPH0314932A - Manufacture of damper - Google Patents

Abstract

PURPOSE:To improve durability of each elastic body by arranging a sleeve divided into plural parts around the outer periphery of a hub, molding-bonding elastic bodies between the divided parts and the hub while the divided parts are separated apart from and each other and closing the divided parts together. CONSTITUTION:A metallic sleeve 4 circumferentially divided into two parts is arranged around the outer periphery of a hub 1 whose front shape is formed into a square, and plural elastic bodies 3 are molded-bonded between divided parts 4a, 4b while the divided parts 4a, 4b of the sleeve 4 are separated apart from each other. The divided parts 4a, 4b are then closed together to compress the elastic bodies 3, and a circular ring-shaped mass body 2 is fitted on the periphery of the divided parts 4a, 4b. Since the elastic bodies 3 are formed into a size with which the elastic bodies can keep a compressive state even when contraction is generated after molding, durability of the elastic bodies 3 can be enhanced. Further, since the clearance of a stopper mechanism can be set to be extremely small, eccentricity of the mass body can be efficiently restricted to prevent generation of vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a damper that absorbs vibrations generated in various rotary drive systems such as propeller shafts of automobile engines.

[Conventional technology]

Conventionally, as a type of damper, as shown in Fig. 6,
A dynamic damper (Tilgar or dynamic damper) has a hub (1) and a mass body (2) that are concentric with each other, and the hub (1) and mass body (2) are connected to each other via a plurality of elastic bodies (3). (also called a vibration absorber) is known. Hub (1
) and the mass body (2) are respectively a predetermined metal and an elastic body (3).
is molded from a predetermined rubber, and this rubber is bonded to each of the hub (1) and the mass body (2) at the same time as hot-flow molding. As shown in the figure, the hub (1) has a rectangular front shape, and the rubber is bonded to the center of each side.

[Problem to be solved by the invention 1 The above damper constitutes a kind of resonance system for the blower shaft and absorbs vibrations (torsional vibrations) generated in the shaft. Since the elastic body (3) is used in a tensile state due to subsequent shrinkage, there is a problem in the durability of the elastic body (3).

In addition, due to radial resonance and centrifugal force, the mass body (2) becomes largely eccentric with respect to the hub (1), that is, the center of rotation, in a certain rotation speed range, resulting in a new problem of vibration generation. have. In order to suppress this eccentricity, the above-mentioned damper has a hub (1) formed into a rectangular shape and its corners function as stoppers (1a). Since the body (3) is hot-flow molded, the gap (a) between the stopper (1a) and the mass body (2) cannot be set small, and there is a problem that the mass body (3) cannot function sufficiently against the eccentricity. are doing.

In view of the above points, it is an object of the present invention to provide a damper that uses an elastic body in compression to increase durability and effectively suppresses eccentricity of a mass body to prevent vibrations caused by the eccentricity. .

[Means for Solving the Problems] In order to achieve the above object, a method for manufacturing a damper according to the first aspect of the present invention includes arranging a sleeve that is divided into a plurality of pieces in the circumferential direction on the outer periphery of a hub, An elastic body is molded and bonded between the divided bodies and the hub with the divided bodies of the sleeve separated from each other, and a mass body is attached to the outer periphery of the divided body while the divided bodies are closed and the elastic body is compressed. It is intended to be fitted.

Further, the manufacturing method according to claim 2M refers to claim 1 above, and provides a damper in which a part of the hub is disposed near the sleeve to function as a stopper, and the gap between the sleeve and the stopper is minimized. It is characterized by setting.

Further, the manufacturing method according to the third aspect includes arranging a mass body formed by dividing into a plurality of pieces in the same direction on both sides of the hub in the axial direction, and molding and bonding an elastic body between each divided body of the mass body and the hub. , the divided bodies are assembled together in a state where the divided bodies are brought close to each other and the elastic body is compressed.

Further, a manufacturing method according to a fourth aspect, citing the third aspect, combines the divided bodies of the mass body through another divided body arranged on the outer periphery of the hub, and combines the divided bodies of the mass body with the other divided bodies. The feature is that the gap between the hubs is set very small.

Further, the manufacturing method according to a fifth claim, citing the third claim above, provides a method in which the dividing body of the mass body, the hub, and the mass body are provided with holes that are continuous in the axial direction, and the dividing body is inserted into the holes. They are combined by a connecting member, and the gap between the connecting member and the inner wall of the hole is set to be minute.

[Function] In the above conventional technology, the elastic body interposed between the hub and the mass body is used in a tensioned state because the elastic body is
This is because the product was molded to the product size from the beginning without considering shrinkage after molding. On the other hand, the first and third
In the manufacturing method according to the claims, the elastic body is molded to a large size so that even if shrinkage occurs after molding, compression remains, and the elastic body is used in a compressed state.

In order to mold the elastic body larger than the product state, the metal parts located on the outside of the elastic body are molded into a plurality of parts, and the elastic body is molded with the divided parts spread apart from each other. After shaping, sufficient compression can be applied to the elastic body by combining the divided bodies into a finished product.

As the outer metal part of the elastic body is divided into multiple parts to form the elastic body, the positional relationship between the outer parts and the inner metal parts of the elastic body will differ from the product state during the molding process. , a sufficient margin is created between both parts to incorporate a part of the flow type. As a result, the gap between the eccentric stopper mechanisms, which was set in the vicinity of both parts, can be set to a minute value, regardless of the incorporation of this hot flow type.

〔Example〕

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

As shown in Figure 1, the hub (
A metal sleeve (4) divided into two in the circumferential direction is arranged on the outer periphery of the sleeve (4), and each divided body (4a) of the sleeve (4)
(4b) separated from each other, each divided body (4a)
A plurality of elastic bodies (3) are molded and bonded between (4b) and the hub (1). Next, as shown in FIG.
a) (4b) are closed together to compress each elastic body (3), and from this state, an annular mass body (2) is fitted around the outer periphery of the divided bodies (4a) and (4b). Each elastic body (3) is
● The elastic body (3) is molded to a size that remains compressed even if it shrinks after molding, thereby increasing the durability of the elastic body (3). As before, the corners of the hub (1), which is formed into a square shape in front, are equipped with stoppers (1a) to suppress the eccentricity of the mass body (2).
However, by changing the above-described molding procedure, the gap (a) between the stopper (1a) and the sleeve (4) can be set very small to enhance the stopper function.

In the embodiments described above, the elastic body (3) is compressed approximately in the radial direction, but it is also possible to compress it in the axial direction.

That is, as shown in FIG. 3, there is a mass body (2) that is molded in two parts in the same direction on both sides of the annular hub (1) in the axial direction.
are arranged, and each divided body (2a) (2b
) and the hub (1), an elastic body (3) is molded and bonded between the hub (1) and the hub (1). Each divided body (2a) (2b) of the mass body (2) is formed into an annular shape, and each elastic body (3) is also formed into an annular shape, but the elastic body (3) is similar to the first embodiment. Similarly, it may be equally divided in the circumferential direction. Also each elastic body (3)
The axial width (thickness) of is molded to be larger (thicker) than the product state shown in the figure. Next, both split bodies (2a) (
2b) are brought close to each other to compress each elastic body (3) in the axial direction, and in this state, the divided bodies (2a) and (2b) are assembled together. Each elastic body (3) is molded to a thickness that maintains a compressed state even if it shrinks after molding, thereby increasing the durability of the elastic body (3). In the illustrated damper, this assembly is performed using the third divided body (2C). That is, a third divided body (2c) having a hook-shaped cross section is arranged on the outer circumferential side of each component, and the hooked end of the divided body (2c) is engaged with the left divided body (2a). (2c) is fastened to the right-hand division body (2b) with bolts (5). The hub (1) of this third divided body (2c)
The inner diameter at the outer periphery is set to be very slightly larger than the outer diameter of the hub (1), and an effective stopper with a minute gap (a) is provided at this portion.

In the damper shown in FIG. 4, the divided body (2a
) (2b) is assembled using a plurality of connecting members (6) arranged in the circumferential direction. That is, each part (
2a) (2b) (1) Drill a hole (7) that continues in the axial direction in (3), insert the connecting member (6) into this hole (7), and insert the bolt end of the member (6) on the opposite side. The elastic body (3) is compressed in the axial direction by being screwed into a nut member (8) disposed in the upper part of the elastic body (3). This connecting member (6
) and the outer diameter or inner diameter of the inner wall of the hole (7) is set to be extremely small, thereby providing an effective radial stop. In addition, this hole (7) is drilled in a fan shape as shown in Fig. 5, and along with this, the twisting of the hub (1) and the mass body (2) is suppressed to a certain angle (θ) and the elastic body (3) constitutes a circumferential stopper that prevents excessive twisting. (9) is in color.

[Effects of the Invention] As explained above, according to the present invention, since the elastic body is used in a compressed state, the durability of the elastic body can be improved. Furthermore, since the gap between the stopper mechanism that suppresses the eccentricity of the mass body can be set to a very small gap, the eccentricity of the mass body can be effectively suppressed and vibrations can be prevented from occurring. Also, parts to be added later to the hot-flow molded product (mass body (2) in the first embodiment, third divided body (2c) in the second embodiment)
) The natural frequency can be changed simply by changing the size of .

[Brief explanation of drawings]

FIG. 1 is a front view showing a damper according to a first embodiment of the present invention in a state in the middle of manufacturing, FIG. 2 is a front view showing a completed state, and FIG. 3 is a front view of a damper according to a second embodiment of the present invention. FIG. 4 is a half-cut sectional view showing the completed state of the damper according to the third embodiment of the present invention, FIG. 5 is a sectional view taken along line AA in FIG. 4, and FIG. 6 is the conventional damper. FIG. 3 is a front view of a damper according to an example.

Claims (1)

[Claims] 1. A sleeve (4) formed into a plurality of parts in the circumferential direction is arranged on the outer periphery of the hub (1), and each of the divided parts (4a) (4b) of the sleeve (4) is connected to each other. The divided body (4
a) Molding and adhering an elastic body (3) between (4b) and the hub (1), closing the divided bodies (4a) and (4b) and compressing the elastic body (3); Body (4a)
(4b) A method for manufacturing a damper in which a mass body (2) is fitted onto the outer periphery of the damper. 2. In a damper in which a part of the hub (1) is arranged near the sleeve (4) to function as a stopper (1a), the gap (a) between the sleeve (4) and the stopper (1a) is made small. 2. The method for manufacturing a damper according to item 1, wherein: 3. A mass body (2) formed by dividing into a plurality of pieces in the same direction is arranged on both sides of the hub (1) in the axial direction, and each divided body (2a) (2b) of the mass body (2) and the hub (1) ) between the elastic body (3
) are molded and adhered, the divided bodies (2a) and (2b) are brought close to each other, and the elastic body (3) is compressed.
2a) A method of manufacturing a damper by assembling (2b) together. 4. Combine the divided bodies (2a) and (2b) of the mass body (2) via another divided body (2c) arranged on the outer periphery of the hub (1), and combine the divided bodies (2c) and the Hub (1)
4. The method of manufacturing a damper according to claim 3, wherein the gap (a) is set to be minute. 5. Drill holes (7) connected in the axial direction in the divided bodies (2a) (2b), the hub (1) and the mass body (3) of the mass body (2), and Item 3, characterized in that the combination is made by a connecting member (6) inserted through the hole (7), and the gap (a) between the connecting member (6) and the inner wall of the hole (7) is set to be minute. How to manufacture a damper.