JPH0538437U - damper - Google Patents

Abstract

(57) [Summary] [Purpose] For a damper whose hub is made of light metal, to secure the strength required to mount the damper on the rotating shaft. [Structure] The hub body 1 is made of light metal to ensure the effect of weight reduction, and the boss 2 is made of cast iron to ensure the strength required for mounting. The bush 3 is fitted to the outer peripheral side of the hub body 1 with a predetermined tightening allowance, and this tightening allowance is performed to reduce the diameter of the hub body 1 and prevent a gap from being formed between the hub body 1 and the boss 2.

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, a damper in which a mass body is connected to an outer peripheral side of a hub via an elastic body is known. The hub and mass are each made of cast iron (FC material), and the elastic body is made of rubber. In recent years, however, weight reduction of this type of damper has been implemented, and as a part of this, the hub is made of light metal such as aluminum.

[0003]

[Problems to be solved by the device]

 The above conventional technique has a problem that the damper mounted on the rotary shaft with the hub cannot be firmly mounted on the rotary shaft because the light metal is inferior in strength.

[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 cast iron boss is formed on the inner peripheral side of a light metal hub body. And a bush made of a sleeve, an elastic body and a mass body is fitted to the outer peripheral side of the hub body with a predetermined tightening margin.

[0005]

[Action]

 Although cast iron has the advantage that it is heavier than light metal, but has a high strength, the damper of the present invention uses this cast iron only for the boss to secure the strength required for mounting. When the hub body made of light metal and the boss made of cast iron are integrally molded, casting is generally used. That is, first, the boss is formed into a rough-processed state, the boss is put into a cavity of a mold, the molding material of the hub body is poured into the cavity to integrally cast the hub body and the boss, and then the finishing process is performed. When the hub body and the boss are integrally molded in this way, there is a concern that a gap may occur between the hub body and the boss due to heat shrinkage after molding. On the other hand, in the damper of the present invention, a bush is fitted on the outer peripheral side of the hub body with a predetermined tightening margin, and the hub margin is reduced in diameter by this tightening margin to eliminate the gap.

[0006]

【Example】

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

As shown in FIGS. 1 and 2, a cast iron boss 2 is provided on the inner peripheral side of an aluminum hub body 1, and a sleeve 4, an elastic body 5, and a mass body 6 are provided on the outer peripheral side of the hub body 1. The bush 3 is fitted with a predetermined tightening margin, and the damper is molded by the following method. The hub body 1 and the boss 2 are molded by casting as described above. That is, first, the boss 2 is formed into a rough-worked state, the boss 2 is put into a cavity of a mold, the molding material of the hub body 1 is poured into the cavity, and the hub body 1 and the boss 2 are integrally cast, After that, finish processing. The bush 3 is formed by the following method. That is, first, a sleeve 4 is formed by using a sheet metal as a material, a mass body 6 is formed by using cast iron as a material, the sleeve 4 and the mass body 6 are put into a cavity of a mold, and a molding material of the elastic body 5 ( (Rubber) is poured and the bush 3 including the sleeve 4, the elastic body 5 and the mass body 6 is integrally vulcanized and molded. The inner diameter of the sleeve 4 is initially set to be smaller than the outer diameter of the hub body 1, and thereby the tightening margin of the bush 3 with respect to the hub body 1 is set. Next, the bush 3 is fitted to the hub body 1. By doing so, even if a gap (indicated by a broken line in FIG. 2) is generated between the hub body 1 and the boss 2 due to heat shrinkage or the like after molding, this gap is reduced by the diameter reduction deformation of the hub body 1. It is possible to obtain an excellent product with no play due to gaps.

The hub body 1 and the boss 2 are provided with a recess 1 a and a protrusion 2 a which engage with each other to prevent rotation. Further, the portion indicated by reference symbol B in FIG. 1 is a portion which is not easily tightened even if the bush 3 is fitted because its position is off the inner circumference of the bush 3, and this portion is separated to form a gap. In order to prevent this, an annular projection 1b and an annular recess 2b which are engaged with each other are provided so as to have a catch.

[0009]

[Effect of the device]

 The present invention has the following effects. That is, since the hub body is made of light metal to ensure the weight reduction effect and the boss is made of cast iron, the strength required for mounting can be secured. Further, since the bush is fitted on the outer peripheral side of the hub body with a predetermined tightening margin, this hub allows the hub body to contract and deform, and an excellent product free from play due to a gap can be obtained.

[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 taken along line AA in FIG.

[Explanation of reference numerals] 1 hub body 1a, 2b recessed portion 1b, 2a protrusion 2 boss 3 bush 4 sleeve 5 elastic body 6 mass body

Claims (1)

[Scope of utility model registration request] 1. A boss 2 made of cast iron is provided on the inner peripheral side of a hub body 1 made of light metal, and a bush 3 made up of a sleeve 4, an elastic body 5 and a mass body 6 is tightened on the outer peripheral side of the hub body 1 in a predetermined manner. A damper characterized by being fitted with a margin.