JPS62292921A - Center bearing - Google Patents

Abstract

PURPOSE:To prevent a crack or interference due to permanent set in fatigue of an elastic body from occurring, by bringing an inner cylinder into an eccentric state for no loading condition so that both inner and outer cylinders become concentric with each other when both are under the load of a propeller shaft or the like and then putting an elastic body into a space between the inner cylinder and the outer cylinder. CONSTITUTION:An elastic body 3 formed with a bellows in put into a space between an inner cylinder and an outer cylinder both of which are made of rigid material, and a bearing 4 is inserted into the inner cylinder 4. In putting the elastic body 3 in place, eccentricity is given to the elastic body 3 for a no load condition, so that, when a propeller shaft is supported by the bearing 4, the weight of the propeller shaft stretches the upper elastic body 3 and shortens the lower elastic body 3, thereby bringing both inner cylinder 1 and outer cylinder 2 in a concentric state. Accordingly, since the spring characteristics become symmetrical, it can be prevented that a crack occurs in the elastic body 3 or that the interference due to permanent set in fatigue or the interference with mating parts occurs.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] This invention supports a propulsion shaft etc. with a bearing, attaches this bearing to an inner cylinder, and connects the inner cylinder and outer cylinder. It relates to a center bearing with an elastic body installed in between.

[Conventional technology]

In the conventional center bearing, as shown in FIG. 4, the inner tube 100 and the outer tube 101 form a concentric circle when no load is applied. When a propulsion shaft or the like is supported by the bearing 102, a load is applied to the elastic body 103, causing the inner cylinder 100 to become eccentric.

[Problem to be solved]

When the inner cylinder 100 becomes eccentric under a load, there arises a drawback that the functional characteristics and durability as a vibration isolating rubber are inferior (see the graph indicated by reference numeral B in FIG. 3).

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a center hair ring in which the inner tube and the outer tube are concentric with each other without eccentricity under load, and the spring characteristics are made symmetrical to prevent deterioration of durability.

[Means for Solving the Problems] “In order to achieve the above-mentioned object, the present invention provides a structure in which the inner cylinder and the outer cylinder are concentric when a load is applied to the propulsion shaft, etc. The tube was configured to be eccentric.

[Effect]

In this invention, the state in which the propulsion shaft, etc. is supported by the hair ring,
In other words, when a load is applied, the inner cylinder and the outer cylinder form the same center circle, exhibiting symmetrical spring characteristics.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

The center hair ring in FIG. 1 shows the state under no load, and an elastic body 3 made of heros is installed between the inner cylinder 1 and the outer cylinder 2 made of a regular material, and the center hair ring is inserted into the inner cylinder 1. I am wearing hair ring 4. In the state shown in FIG.
is eccentric with respect to the outer cylinder 2. When the hair ring 4 supports the propulsion shaft 5, as shown in FIG. The outer cylinder 2 forms a concentric circle. In Fig. 2, the outer cylinder 2 is fixed to the vehicle body side, and the hair ring 4
is applied to the inner cylinder 1.

When the center hair ring of the present invention is used, the spring characteristics are symmetrical, as shown by the reference numerals in FIG.

〔effect〕

As explained above, the present invention is designed to keep the inner cylinder eccentric when no load is applied so that the inner cylinder and the outer cylinder form concentric circles when a load is applied to the propulsion shaft, etc. Since it is formed in N, the spring characteristics are symmetrical, and there is no cracking in the elastic body, no interference due to bending, and no interference with mating parts.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a preferred embodiment of the present invention under no load, Fig. 2 is a sectional view under load, Fig. 3 is a graph showing a comparison of spring characteristics between the conventional example and the invented product; FIG. 4 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Inner cylinder, 2... Outer cylinder, 3... Elastic body, 4... Hair ring, 5... Propulsion shaft. Applicant Brideston Co., Ltd. Agent Patent Attorney Masu 1) Takeo Figure 7/631 Figure 2 x 84

Claims (1)

[Scope of Claims] 1. A center bearing in which an elastic body is installed between an inner cylinder and an outer cylinder made of a rigid material, and a bearing for supporting a vehicle's propulsion shaft, pipes, etc. is installed in the inner cylinder. A center bearing characterized in that the inner cylinder is kept eccentric when no load is applied so that the inner cylinder and the outer cylinder form concentric circles when a load is applied to the shaft or the like.