JPH0720737Y2 - Bearing structure of pedal arm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a bearing portion structure of a pedal arm such as a brake pedal and a clutch pedal of a vehicle.

[Prior art]

A foot pedal type pedal arm 1 such as a vehicle brake pedal and a clutch pedal is generally a pedal fixed to an inside panel 2 with a predetermined gap therebetween, as shown in FIG. 1 (a side view around the brake pedal). Bracket 3
Is rotatably supported by a bearing structure shown in FIG.

That is, in the cylindrical housing 4 having the pedal arm 1 fixed to the outer peripheral surface, a synthetic resin bearing bush 5 having a flange portion 5a at one end of each of the both ends thereof is provided so that the back surface of the flange portion 5a contacts the end surface of the cylindrical housing 4. The bearing bush 5 is press-fitted into contact with the bearing bush 5. A bolt 6 is inserted into the bearing bush 5 with a predetermined clearance, and the bolt 6 is fixed to the pedal bracket 3.

[Problems to be solved by the invention]

In the conventional bearing structure described above, there is a problem in that a high-frequency minute vibration generated from the vehicle body or the engine is directly transmitted to the pedal arm through the inside panel, which causes a driver discomfort. For the purpose of absorbing this minute vibration in the bearing portion, for example, rubber elasticity is provided in the cylindrical space portion formed by the inner surface of the housing 4, the end surface of the bearing bush 5, and the outer peripheral surface of the bolt 6 in the cylindrical housing 4. A temporary solution can be achieved by inserting the cushioning member made of a body.

However, the cushioning member made of a rubber elastic body is interposed between the rotation surfaces of the bearing bush 5 and the bolt 6 when the pedal arm 1 is operated, which impedes smooth rotation of the pedal arm 1. There is a problem that it is interposed between the rotating surfaces to increase the coefficient of friction and prevent smooth rotation of the bearing bush 5 and the bolt 6 to make the pedal operation heavy.

In view of the above-mentioned problems, the present invention absorbs high-frequency micro-vibration transmitted to the pedal arm without disturbing the smooth rotation operation of the pedal arm, and does not make the driver feel uncomfortable. The purpose is to obtain the structure.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention adopts the following configuration (technical means).

That is, the bearing part structure of the pedal arm rotatably supported by the pedal brackets fixed to the inside panel so as to face each other at a predetermined interval, and both ends of the bearing part structure of the pedal housing fixed to the outer peripheral surface. Bearing bushes made of synthetic resin, each of which has a flange at one end, are press-fitted with the back surface of the flange abutting the end face of the cylindrical housing, and bolts are fitted in the bearing bush with a predetermined clearance. The bolt is inserted and fixed to the pedal bracket, and friction resistance is applied to the cylindrical space formed by the inner surface of the housing, the end surface of the bearing bush, and the outer peripheral surface of the bolt in the cylindrical housing. Pedal gear characterized in that an intermediate bearing made of a thermoplastic synthetic resin exhibiting speed dependence is arranged under a compressive load. A bearing portion structure.

In the above-mentioned configuration, as the thermoplastic synthetic resin having a frictional resistance that forms a speed dependence of the intermediate bearing, polyolefin resin such as polyethylene resin and polypropylene resin, polyester resin such as polyester elastomer, and the like are preferable materials.

[Action / effect]

The friction resistance of thermoplastic synthetic resin made of polyolefin resin or polyester resin is speed-dependent, and has a large friction resistance in the high speed region, and a small friction resistance in the medium or low speed region. Utilizing the characteristics, the cylindrical space formed by the inner surface of the housing, the end surface of the bearing bush, and the outer peripheral surface of the bolt is formed of a thermoplastic synthetic resin selected from polyolefin resin or polyester resin in the cylindrical housing. By arranging the intermediate bearing with a compressive load applied, the frictional resistance is large in the speed range (high speed) of high-frequency micro-vibration generated from the vehicle body or the engine, and the micro-vibration is absorbed, and the speed range during pedal operation is increased. At low or medium speeds, the frictional resistance is small and smooth pedal operation is possible. It is possible to remove the discomfort caused by the high-frequency micro-vibration.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 and 2 of the accompanying drawings showing an embodiment thereof.

A pedal arm 1 as a brake pedal is rotatably supported via a bearing portion A on a pedal bracket 3 fixed to the inside panel 2 of the vehicle so as to face each other at a predetermined interval.

The bearing portion A is integrally provided with a cylindrical housing 4 having the pedal arm 1 fixed on the outer peripheral surface thereof and a flange portion 5a at one end thereof, and the back surface of the flange portion 5a is brought into contact with the end surface of the cylindrical housing 4 so that the cylindrical housing 4, a bearing bush 5 made of a synthetic resin, which is press-fitted and fixed to both ends, and a bolt 6 and a cylindrical housing, which are fitted and inserted into the inner peripheral surfaces of the bearing bushes 5 and 5 with a predetermined clearance, and are fixed to the pedal bracket 3. 4, an intermediate bearing 7 arranged in a state in which a compressive load is applied to a cylindrical space S formed by the inner surface of the housing 4, the end surfaces of the bearing bushes 5 and 5 and the outer peripheral surface of the bolt 6. Has been done.

Here, the intermediate bearing 7 formed of a thermoplastic synthetic resin selected from a polyolefin resin or a polyester resin is provided in the cylindrical housing 4 with the inner surface of the housing 4, the end surfaces of the bearing bushes 5 and 5, and the outer peripheral surface of the bolt 6. Formed to be larger than the axial length of the cylindrical space S formed by
At the time of assembling, the bearing bushes 5 and 5 are axially compressed by the end faces thereof to apply a compressive load to the intermediate bearing 7.

In the figure, reference numeral 8 is a pedal pad provided on the lower end portion of the pedal arm 1 for the driver to put his / her foot, reference numeral 9 is a stopper bracket fixed to the pedal bracket 3, and 10 is one end fixed to the pedal arm 1. The other end is a return spring fixed to the stopper bracket 9, and the spring 10 constantly biases the pedal arm 1 in a counterclockwise direction with a spring force.

Due to the bearing portion structure of the pedal arm having the above-described structure, high-frequency microvibration generated from the vehicle body or the engine is absorbed by the intermediate bearing 7 arranged in the cylindrical housing 4 in a state where a compressive load is applied, and the vibration is pedaled. Since it is not transmitted to the arm 1, no discomfort is given to the driver. Further, during normal pedal operation, the intermediate bearing 7 allows smooth operation without increasing the friction coefficient on the rotating surface.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing the periphery of a brake pedal, FIG. 2 is a sectional view of a bearing structure of a brake pedal showing an embodiment of the present invention (a sectional view taken along the line II in FIG. 1), FIG. 3 is a cross-sectional view of a conventional bearing structure of a brake pedal. 1 ... Pedal arm, 4 ... Cylindrical housing 5 ... Synthetic resin bearing bush 5a ... Collar part, 6 ... Bolt 7 ... Intermediate bearing, S ... Cylindrical space part

Claims (2)

[Scope of utility model registration request] 1. A bearing structure for a pedal arm, which is rotatably supported by pedal brackets fixed to the inside panel so as to face each other with a predetermined gap, in a cylindrical housing having a pedal arm fixed to an outer peripheral surface. Is fitted with a synthetic resin bearing bush having a flange portion at one end at each end, and the back surface of the flange portion is brought into contact with the end surface of the cylindrical housing by press fitting. A predetermined clearance is provided in the bearing bush. And a bolt is inserted between the pedal brackets, and the bolt is fixed between the pedal brackets, and a cylindrical space formed by the inner surface of the housing, the end surface of the bearing bush, and the outer peripheral surface of the bolt in the cylindrical housing. A pedal characterized in that an intermediate bearing made of a thermoplastic synthetic resin whose frictional resistance exhibits speed dependence is arranged in a portion under a compressive load. The bearing portion structure of over-time. 2. The bearing portion structure of a pedal arm according to claim 1, wherein the intermediate bearing is formed of a thermoplastic synthetic resin selected from a polyolefin resin and a polyester resin whose frictional resistance exhibits speed dependence. .