JPH0720739Y2 - Bearing structure of pedal arm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] 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.

[Conventional technology]

A foot pedal type pedal arm 1 such as a brake pedal and a clutch pedal of a vehicle is generally fixed to an inside panel 2 at a predetermined interval so as to face each other and fixed to a pedal bracket as shown in FIG. 1 (a side view around the brake pedal). 3,
3 is rotatably supported by the bearing structure shown in FIG.

That is, in the cylindrical housing 4 having the pedal arm 1 fixed on the outer peripheral surface thereof, synthetic resin bearing bushes 5, 5 having flange portions 5a at one end are provided on both ends of the cylindrical housing 4 with the back surface of the flange portion facing the end surface of the cylindrical housing 4. Abutting and press-fitted,
Bolts 6 are inserted into the bearing bushes 5 and 5 with a predetermined clearance, and the bolts 6 are nuts.
The pedal brackets 3 and 3 are clamped and fixed by 6a.

[Problems to be solved by the invention]

The conventional bearing structure described above has a problem in that a high-frequency microvibration 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 slight vibration in the bearing portion, for example, the inner surface of the housing 4 and the bearing bushes 5, 5 are provided in the cylindrical housing 4.
A temporary solution can be made by inserting a cushioning material made of a rubber elastic body into a cylindrical space formed by the end surface and the outer surface of the bolt 6.

However, the cushioning material 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 the friction coefficient is increased by interposing between the rotating surfaces, the smooth rotation of the bearing bushes 5 and 5 and the bolt 6 is impeded, and the pedal operation becomes 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 cause a driver's discomfort. The purpose is to obtain a partial structure.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention adopts the following configurations (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 collar portion at one end, are press-fitted with the back surface of the collar portion abutting the end surface of the cylindrical housing, and a bolt is inserted into the bearing bush. In addition, the bolt is fixed between the pedal brackets, and the friction resistance depends on the speed in 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. The intermediate bearing, which is made of thermoplastic synthetic resin and has a plurality of uneven portions that penetrate the outer peripheral surface in the axial direction, is compressed in the radial direction and the axial direction. A bearing portion structure of the pedal arm is arranged in a state in which a compressive load is applied to the inside.

In the above-described configuration, a plurality of uneven portions may be formed on the outer peripheral surface of the intermediate bearing so as to penetrate in the axial direction thereof.

Then, as the thermoplastic synthetic resin in which the frictional resistance forming the intermediate bearing exhibits speed dependence, a polyolefin resin,
For example, it is selected from polyethylene resin, polypropylene resin and the like, polyester resin such as polyester elastomer and the like.

[Action / effect]

The thermoplastic synthetic resin selected from the polyolefin resin or the polyester resin forming the intermediate bearing has a frictional resistance that is speed-dependent, that is, the frictional resistance is high in the high speed region, and the frictional resistance is high in the medium to low speed region. By utilizing this characteristic, it is made of the thermoplastic synthetic resin in the cylindrical space formed by the inner surface of the housing, the end surface of the bearing bush, and the outer surface of the bolt. By arranging an intermediate bearing, which has a plurality of uneven portions penetrating in the axial direction on its surface or inner and outer circumferential surfaces, in the radial direction and in the axial direction and applying a compressive load inside the bearing, Or, in the speed range (high speed) of high-frequency micro-vibration generated from the engine, the frictional resistance is large and the micro-vibration is absorbed,
Further, in the speed range (medium speed or low speed) at the time of pedal operation, the frictional resistance is small and the smooth pedal operation can be performed, so that the driver does not feel uncomfortable due to the high frequency micro vibration.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 9 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 pedal brackets 3 and 3 fixed to an inside panel 2 of a 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 collar portion 5a at one end thereof, and the back surface of the collar portion 5a is brought into contact with both end surfaces of the cylindrical housing 4 to form a cylinder. Bearing bushes 5 and 5 made of synthetic resin and press-fitted into both ends of the housing 4 and the bearing bushes 5 and 5, respectively.
The inner surface of the housing 4, the bearing bush 5, and the end surface of the bearing 6 are inserted into the inner surface of the pedal bracket 3 with a predetermined clearance and fixed between the pedal brackets 3 and 3 by a nut 6a. A cylindrical space S formed by the outer surface of the bolt 6 and an intermediate bearing 7 arranged under a compressive load.

Here, the intermediate bearing 7 is formed of a thermoplastic synthetic resin selected from a polyolefin resin or a polyester resin whose frictional resistance shows speed dependence.
The outer peripheral surface of the plurality of concavo-convex portions 8 penetrating in the axial direction,
9 is formed.

The length of the intermediate bearing 7 is larger than the axial length of the cylindrical space S formed in the cylindrical housing 4, and the outer diameter formed by the convex portion 9 on the outer peripheral surface is the cylindrical housing 4. Is formed larger than the inner diameter of the.

In the thus formed intermediate bearing 7, a plurality of convex portions 9 formed on the outer peripheral surface thereof are pressed in the radial direction by the inner surface of the cylindrical housing 4, and the end surfaces thereof respectively contact the end surfaces of the bearing bushes 5, 5. It is arranged in a state where a compressive load is applied to the cylindrical space S formed by being pressed and formed in the cylindrical housing 4.

Due to the bearing structure of the pedal arm configured as described above, high-frequency micro-vibration 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 micro-vibration is generated. Is not transmitted to the pedal arm 1, so that the driver does not feel uncomfortable due to the high frequency micro vibration. Further, during normal pedal operation, the intermediate bearing 7 is interposed between the rotating surfaces to allow smooth operation without increasing the coefficient of friction.

In FIG. 1, reference numeral 8 denotes a pedal pad provided on the lower end portion of the pedal arm 1 on which the driver rests his foot, 9 denotes a stopper bracket fixed to the pedal bracket 3,
Reference numeral 10 is a return spring having one end fixed to the pedal arm 1 and the other end fixed to the stopper bracket 9, and the spring 10 constantly biases the pedal arm 1 in a counterclockwise direction with a spring force. .

6 to 9 show another embodiment, and this embodiment shows a modification of the intermediate bearing 7 in the above-mentioned embodiment.

That is, the intermediate bearing 7 is made of a thermoplastic synthetic resin selected from a polyolefin resin or a polyester resin whose frictional resistance shows a speed dependence, and the outer peripheral surface of the intermediate bearing 7'is penetrated in its axial direction. A plurality of concave and convex portions 8.9, 8'and 9'are formed. The length of the intermediate bearing 7 is larger than the axial length of the cylindrical space S formed in the cylindrical housing 4, and the outer diameter formed by the convex portion 9 on the outer peripheral surface is the cylindrical housing 4.
Is larger than the inner diameter of the bolt 6 and is larger than the outer diameter of the bolt 6. In the thus formed intermediate bearing 7, a plurality of convex portions 9 formed on the outer peripheral surface thereof are pressed radially inward by the inner surface of the cylindrical housing 4 to form a plurality of convex portions 9 formed on the inner peripheral surface thereof. The convex portion 9'of the bolt 6 is pressed radially outward by the outer surface of the bolt 6,
The end faces thereof are pressed by the end faces of the bearing bushes 5 and 5, respectively, and are arranged in a state in which a compressive load is applied to the cylindrical space S formed in the cylindrical housing 4.

In this way, by using the intermediate bearing 7'in which a plurality of concave-convex portions 8, 9, 8 ', 9'penetrating in the axial direction are formed on the inner and outer peripheral surfaces, the ability to absorb high-frequency micro-vibration is improved. It is enhanced, and the driver does not feel uncomfortable due to high frequency micro vibration.

[Brief description of drawings]

1 is a partial sectional side view showing the periphery of a brake pedal, FIG. 2 is a longitudinal sectional view showing a bearing structure, FIG. 3 is a front view showing an intermediate bearing, and FIG. 4 is a sectional view taken along line II in FIG. 5 is a sectional view taken along the line II-II of FIG. 2, FIG. 6 is a longitudinal sectional view showing another embodiment of the bearing structure, and FIG. 7 is an intermediate used in the bearing structure shown in FIG. A front view of the bearing, FIG. 8 is a sectional view taken along the line III-III in FIG. 7, FIG. 9 is a sectional view taken along the line IV-IV in FIG. 6, and FIG. 10 is a longitudinal sectional view showing a conventional technique. 1: Pedal arm, 4: Cylindrical housing 5: Synthetic resin bearing bush, 5a: Collar part 6: Bolt, 7, 7 ': Intermediate bearing 8.9, 8', 9 ': Concavo-convex part, S: Cylindrical space part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F16F 15/08 K 9138-3J

Claims (3)

[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 collar portion at one end at each end, and the back surface of the collar portion is abutted against the end surface of the cylindrical housing, and a bolt is inserted into the bearing bush. And the bolt is fixed between the pedal brackets, 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. Is composed of a thermoplastic synthetic resin exhibiting speed dependence, and an intermediate bearing having a plurality of concavo-convex portions that penetrate the outer peripheral surface in the axial direction is The bearing unit construction of the pedal arm, characterized in that are arranged in a state in which a compressive load is applied to the interior Te. 2. The bearing portion structure for a pedal arm according to claim 1, wherein a plurality of concave and convex portions are formed on the outer peripheral surface of the intermediate bearing so as to penetrate in the respective axial directions. 3. The bearing part structure of a pedal arm according to claim 1, wherein the thermoplastic synthetic resin forming the intermediate bearing whose frictional resistance exhibits speed dependence is selected from polyolefin resin and polyester resin.