JPH01190586A - Bearing device for vehicle - Google Patents

Abstract

PURPOSE:To aim at commonage of a fitting part to a vehicle body in two-wheel and four-wheel steering vehicles by fitting a cylindrical hub for wheel mounting rotatably through a rolling body on the outside circumference of a swingable operation member which is fitted in the wheel steering direction on the outside circumference of a sheet-shaped fixed member. CONSTITUTION:A fixed member 10 which is fixed to the side of a vehicle body such as a chassis by bolts and so on, is formed by providing an outward the flange 11 for attaching the chassis and a shaft part 13 that forms a spherical surface part 12 on its pointed end, and the shaft part 13 of this fixed member 10 is covered from the outside by the operation member 20. The operation member 20 consists of a spherical surface seat 22 in which the spherical part 12 of the fixed member 10 can seat slidably on the inner peripheral of the cylindrical part 21, and linkage attaching projecting piece 23 which is connected to the linkage of a rear wheel steering mechanism. And then, both end portions of a pin 30 which is fitted to said spherical surface part 12 is fitted to the cylindrical part of the operation member 20. Furthermore, a hub 40 for wheel mounting is fitted rotatably on the circumference of the cylindrical part 21 through two lines of rolling bodies 50.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a bearing device for a vehicle wheel.

<Conventional Technology> In recent years, automobiles have adopted a four-wheel steering system that has superior turning performance and high-speed running stability compared to a general two-wheel steering system. This four-wheel steering system includes a steering angle-sensitive type that controls the turning angle of the rear wheels according to the steering angle of the steering wheel, and a vehicle speed-sensitive type that controls the turning angle of the rear wheels according to the vehicle speed. .

By the way, for example, in a front-wheel drive two-wheel steering vehicle, there is no need to steer the rear wheels, so a bearing device l as shown in FIG. 3, for example, is used to attach the rear wheels to the vehicle body. In this figure, reference numeral 2 denotes a hub on which the wheel is attached;
3 is a fixed member fixed to the chassis, axle, etc., and 4 is a transfer ball.

On the other hand, since it is necessary to steer the rear wheels of a four-wheel steered vehicle, the rear wheel steering mechanism, which is not shown in the drawings, is attached to the rear wheel, and includes a link mechanism similar to the conventionally known front wheel steering mechanism. are connected.

By the way, in the case of a four-wheel steering vehicle, the steering angle of the rear wheels is actually used within a range of about ±5°, and the steering angle of the front wheels is used within a range of, for example, ±40°.

<Problems to be Solved by the Invention> By the way, the conventional example having such a configuration has the following problems.

Generally, automobile manufacturers produce vehicles of the same type with two systems, a four-wheel steering system and a two-wheel steering system, so that users can choose according to their preference. Because the mechanism is required, the number of parts is greater than that of a two-wheel steered vehicle, and the body structure to which the rear wheel bearing device is attached is different from that of a two-wheel steered vehicle, so parts and components of a two-wheel steered vehicle of the same model are different. It was not possible to standardize the vehicle body.

That is, if it is possible to increase the number of common parts and bodies between two-wheel steered vehicles and four-wheel steered vehicles as much as possible, it is possible to reduce the number of parts and reduce the vehicle weight of four-wheel steered vehicles. Against this background, there is a demand for streamlining vehicle body assembly by standardizing parts and body structures for two-wheel steering vehicles and four-wheel steering vehicles.

Therefore, the present proponents focused on the fact that the steering angle of the rear wheels in a four-wheel steering vehicle is about ±5°, which is smaller than the steering angle of the front wheels, for example, ±40°. By incorporating a steerable JM structure into the bearing device,
The purpose of this project is to standardize the vehicle body mounting portions of the rear wheel bearing devices for two-wheel steered vehicles and four-wheel steered vehicles.

Means for Solving the Problems> In order to achieve the above object, the present invention has the following configuration.

That is, the wheel bearing '2H according to the present invention includes: a ring-shaped fixing member attached to the vehicle body side; an operating member fitted on the outer periphery of the fixing member so as to be swingable in the wheel steering direction; This configuration includes a cylindrical wheel mounting hub that is rotatably fitted to the outer periphery of the operating member via a plurality of rolling elements.

The wheel bearing device also includes: a cylindrical fixing member attached to the vehicle body side; a cylindrical operating member fitted into the hollow interior of the fixing member so as to be swingable in the wheel steering direction; A hub for mounting a shaft-shaped wheel rotatably inserted into the hollow interior of the operating member via a plurality of rolling elements may be provided.

<Effect> The effects of the configuration of the present invention are as follows.

In other words, since the operating member can swing in the wheel steering direction with respect to the fixed member, if this operating member is swung in one direction relative to the fixed member by an appropriate method, it will integrally move with the fixed member. The hub moves, and the wheels attached to the hub are steered.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a longitudinal sectional view showing a wheel bearing device according to an embodiment of the invention as claimed in claim 11.

In the bearing device for a wheel on the mouth side, reference numeral 10 denotes a fixing member that is immovably fixed to the wheel body side, such as a chassis (not shown), by bolts, welding, or the like. This fixing member 10 is
It includes an outward flange 11 for mounting on a chassis, and a shaft portion 13 having a spherical portion 12 formed at its tip.

An operating member 20 is fitted onto the shaft portion 13 of the fixed member 10, and a spherical portion 12 of the fixed member 10 is slidably seated on the inner peripheral surface of the cylindrical portion 21 of the operating member 20. A spherical seat 22 is formed therein, and a protrusion 23 for attaching a linkage to which a linkage (not shown) of a rear wheel steering mechanism is coupled is integrally provided at a predetermined position of the cylindrical portion 21 .

The upper and lower ends of a pin 30 along the radial direction are fixed to the cylindrical portion 21 of the operating member 20, and the body portion of the pin 30 is connected to the spherical portion 12 of the fixed member 10.
is penetrated by. In other words, the operating member 20 is swingable relative to the fixed member 10 about this pin 30 (see - dotted chain line 0). During this rocking, the shaft portion 13
Since the spherical portion 12 of the operating member 20 and the spherical seat 22 of the operating member 20 come into sliding contact, either one of the members should be made of a lubricating material, or a lubricating film should be formed on the surfaces of both. is preferable.

Further, a hub 40 for mounting a wheel is rotatably fitted to the outer periphery of the cylindrical portion 21 of the operating member 20.

This hub 40 includes an outward flange 41 for mounting a wheel,
A cylindrical portion 4 with two annular raceway grooves 42 carved on the inner circumferential surface.
3. In correspondence with the raceway groove 42 of the cylindrical part 43 of the hub 40, two annular raceway grooves 24 are also carved on the outer peripheral surface of the cylindrical part 21 of the operating member 20, and a plurality of raceway grooves are formed between both the raceway grooves. A ball 50 as a rolling element is interposed in a movable manner.

That is, the operating member 20. hub 40 and ball 50
This constitutes a rolling bearing, which allows the hub 40 to
is rotatable around the operating member 20.

Further, 70 is a cover, and 80 is a seal.

Next, the operation will be explained.

When the above-described wheel bearing device is used for the rear wheels of a front-wheel drive four-wheel steering vehicle, for example, the projecting piece 23 of the operating member 20
A linkage (not shown) of a rear wheel steering mechanism provided in a four-wheel steering vehicle may be connected to the rear wheel steering mechanism. Since the hub 40 moves in the same direction, the rear wheel (not shown) attached to the hub 40 is steered.

FIG. 2 is a longitudinal sectional view showing a wheel bearing device according to an embodiment of the invention of claim (2). In the drawings, the same reference numerals as in FIG. 1 refer to the same parts or corresponding parts.

The structure of the embodiment shown in FIG. 2 is different from the embodiment shown in FIG. The main point is that the hub 40 and the like are included inside. Specifically, the fixing member 10 includes a cylindrical portion 14 having a spherical seat 15 formed on its inner peripheral surface. The spherical seat 15 of the cylindrical portion 14 has a cylindrical operating member 2 whose outer peripheral surface is formed into a spherical shape.
0 is seated. On the upper surface of this operating member 20,
A linkage mounting bar 60 to which a linkage of a rear wheel steering mechanism (not shown) is coupled is attached to the cylindrical portion 14 of the fixed member 10.
It is fixed in a state where it passes through a through hole 16 on the upper surface of the .

Further, on the lower surface of the fixing member 10, there are pins 3 along the radial direction.
0 is fixed, and the upper end of this pin 30 is rotatably fitted into the operating member 20. The axis of this pin 30 and the rotation center of the bar 60 are set coaxially (-
(See dotted chain line 0).

The hub 40 includes a shaft portion 44, and this shaft portion 4
A plurality of balls 50 are movably interposed between the inner circumferential surface of the operating member 20 and the race 45 fitted on the outer circumferential surface of the operating member 4 and the shaft end thereof. That is, the operating member 20.
Since the shaft portion 44 of the hub 40 and the balls 50 constitute a rolling bearing, the hub 40 is rotatable within the hollow interior of the fixed member 10.

The wheel bearing device of the embodiment shown in Fig. 2 is installed on a four-wheel steering vehicle in almost the same way as the embodiment shown in Fig. 1.
You can do it with

That is, when applied to the rear wheels of a front-wheel drive four-wheel steering vehicle, the outward flange 11 of the fixing member 10 is fixed to the chassis, etc., and the linkage of the rear wheel steering mechanism (
(not shown) are connected to each other, and further a rear wheel is attached to the outward flange 41 of the hub 40. Therefore, when the linkage is operated, the operating member 20 swings in one direction in the wheel steering direction around the pin 30 via the bar 60, and the hub 4o moves in the same way, causing the rear wheel to move. It will be steered.

In addition, in each of the first and second embodiments shown in FIG. 2, the case where such a wheel bearing device is applied to the rear wheel side is explained.
It is also possible to apply it to the front wheel side. Furthermore, it goes without saying that the present invention is not limited to the configurations shown in FIGS. 1 and 2.

By the way, in the embodiments shown in FIGS. 1 and 2, the steering force can be minimized by aligning the swing centers of the operating member 20 and the hub 4o with the grounding points of the wheels during steering.

<Effect of the invention> According to the present invention, the following effects are achieved.

The wheel bearing device of the present invention is based on a rear wheel bearing device of a simple structure for a two-wheel steering vehicle used for fishing boats, and has been improved to have a structure in which the hub can be steered in the wheel steering direction. It becomes possible to design the same bearing device and vehicle body mounting structure. Therefore, even if different steering systems are adopted, the vehicle body structure to which the wheel bearing devices are attached can be made common.

Therefore, the assembly process for two-wheel steered vehicles and four-wheel steered vehicles of the same type can be shared, and the vehicle body assembly can be streamlined.

In addition, when a four-wheel steering vehicle is configured using such a wheel bearing device, it can contribute to a reduction in the number of parts, weight reduction, and cost reduction compared to conventional devices.Furthermore, it can contribute to a reduction in the number of parts, weight reduction, and cost reduction, as well as a reduction in the unsprung load. It is effective in improving comfort and operability as well as saving energy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a wheel bearing device which is an embodiment of the invention of claim (11), and FIG. 2 is a longitudinal cross-sectional view showing a wheel bearing device which is an embodiment of the invention of claim (2). FIG. 3 is a longitudinal sectional view showing a conventional rear wheel bearing device exclusively for two-wheel steering vehicles. 10...Fixing member 20...Operating member 40...Hub 50 ...Ball (rolling element).

Claims (2)

[Claims] (1) A shaft-shaped fixing member attached to the vehicle main body side, an operating member fitted on the outer periphery of this fixing member so as to be swingable in the wheel steering direction, and a plurality of rotating shafts attached to the outer periphery of the operating member. A wheel bearing device comprising: a cylindrical wheel mounting hub that is rotatably fitted together via a moving body; (2) A cylindrical fixing member attached to the vehicle body side, a cylindrical operating member fitted into the hollow interior of this fixing member so as to be swingable in the wheel steering direction, and a hollow part of this operating member A wheel bearing device comprising: a shaft-shaped wheel attachment hub rotatably inserted through a plurality of rolling elements;