JPH0717855Y2 - Center bearing support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a center that rotatably and elastically supports a propeller shaft that is hung on the lower surface of a vehicle body and horizontally laid under the vehicle body. Regarding improvement of bearing support.

[Conventional technology]

Conventionally, as shown in FIG. 3, the inner ring (21) and the outer ring (2
2) Bellows-shaped elastic body made of elastic material (23)
By vulcanization, and bearing (24) on the inner circumference of the inner ring (21)
A center bearing support fitted with is known. In this center bearing support, the outer ring (22) is hung on the lower surface of the vehicle body of the vehicle by a mounting means such as a bracket, and the propeller shaft (25) that is laid horizontally on the lower side of the vehicle body is mounted on the bearing (24). Inserted on the inner circumference side, it supports a part of the weight of the propeller shaft (25) and functions to suppress the vibration (whirling) generated in the propeller shaft (25) during rotation by the elasticity of the elastic body (23). .

Generally, this type of center bearing support has a spring constant (static spring) of the elastic body (23) so as to suppress striking noise caused by whirling of the shaft (25) when the vehicle starts (low frequency range and large displacement). (Constant) must be set high, and the spring constant of the elastic body (23) is low so as to suppress the muffled noise caused by whirling of the propeller shaft (25) during high-speed traveling (high frequency range / small displacement). Two contradictory characteristics that must be set are required. However, according to the conventional center bearing support, since the elastic body (23) is formed only by a solid rubber-like elastic material having a constant spring constant, any one of the above two characteristics is obtained. After being selected in advance, the elastic body (23) is molded according to the selected characteristics. Therefore, there is a problem that the above selection cannot be changed after molding.

[Problems to be solved by the device]

To address this problem, it is conceivable to use an air spring as described in JP-A-56-147921 or JP-A-49-63848.
Due to its structure, there is a tendency that the spring constant against the input moment in the axial direction becomes too low.

[Means for Solving the Problems]

In view of the above points, the present invention has been devised to solve the problems found in the above-mentioned prior art, and in order to achieve this object, an inner ring and a bracket provided on the outer peripheral side of the inner ring are provided. A center bearing support is provided in which an air spring is provided between the inner ring and the bracket, and an arm portion that holds the air spring from both sides in the axial direction is provided in each of the inner ring and the bracket.

[Action]

When an axial input moment acts on the center bearing support of the present invention having the above-mentioned structure to deform the air spring, the arms provided on the inner ring and the bracket function to suppress this deformation. Since the parts are provided on the inner ring and the bracket, respectively, this deformation suppressing function is great.

〔Example〕

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

As shown in FIGS. 1 and 2, a flanged annular bracket (3) is hung on the lower surface of the vehicle body of the automobile on the outer peripheral side of the inner ring (1) fitted with the bearing (2) on the inner peripheral side. ) Is arranged, and two air springs (4) are sandwiched between the inner ring (1) and the bracket (3) at the lower side and the upper side of the inner ring (1). The inner ring (1) and the bracket (3) are provided with a required number of arms (5) and (6), respectively, so as to hold the air spring (4) from both sides in the axial direction. Further, the arm portion (6) provided on the bracket (3) is provided with an arm portion (7) for preventing the air spring (4) from greatly expanding in the circumferential direction. Inner ring (1)
Is bisected in the axial direction and the bracket (3) is bisected in the radial direction. The air spring (4) is composed of a rubber ball, a bladder or the like.

In the center bearing support having the above structure, the axial input moment acts and the air spring (4)
The inner ring (1) and bracket (3) as they try to deform
The arm portions (5), (6) and (7) provided on the inner surface of the inner ring (1) and the bracket (6) function to suppress the deformation, and particularly the arm portions (5) and (6) that suppress the deformation in the axial direction. Since it is provided in each of 3), the deformation suppressing function is larger than the case where it is provided in only one. Therefore, the deformation of the air spring (4) can be suppressed to a certain extent, so that a higher spring constant can be obtained in the axial direction as compared with the conventional one, thereby improving the durability of the air spring (4). it can.

Further, the strength of the air spring (4) can be increased by putting the base cloth in the thickness of the rubber film forming the air spring (4) or by sticking the base cloth on the surface of the rubber film. Further, the air spring (4) is set to an optimum internal pressure according to the use situation, and has a high spring constant for a low frequency region / large displacement or a low spring constant for a high frequency region / small displacement according to the selected characteristics. Realization. Further, the air spring (4) may be provided with a mechanism such as a valve for automatically adjusting the internal pressure so as to always obtain comfortable characteristics.

[Effect of device]

 The present invention has the following effects.

That is, since the arms that hold the air spring from both sides in the axial direction are provided in the inner ring and the bracket, even if the air spring is deformed by the input moment in the axial direction, the deformation of the air spring is caused by the arms. Is suppressed to some extent. Therefore, it is possible to obtain a higher spring constant in the axial direction than in the conventional case, and thus it is possible to improve the durability of the air spring. Moreover, regarding the configuration of the arm portion, since the arm portion is provided on each of the inner ring and the bracket, the deformation suppressing function is greater than when the arm portion is provided on only one side.

[Brief description of drawings]

1 is a front view of a center bearing support according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a sectional view of a center bearing support according to a conventional example. is there. (1) …… Inner ring, (2) …… Bearing, (3) …… Bracket (4) …… Air spring, (5) (6) (7) …… Arm

Claims (1)

[Scope of utility model registration request] 1. An air spring (4) is provided between an inner ring (1) and a bracket (3) provided on the outer peripheral side of the inner ring (1), and the inner ring (1) and the bracket (3). (5) for holding the air spring (4) from both sides in the axial direction
Center bearing support with (6).