JPH1191392A - Hub clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount a gasket to an edge part of a cover. SOLUTION: In this device, an edge part of a wheel hub is sealed by a cover 11 fastened through a gasket 13, and 2WD and 4WD are switched by controlling the pressure fluid. On this occasion, a gasket positioning groove 35 is formed on an edge part of the cover 11, and a positioning claw 36 to be fitted into the groove 35, and a slip check claw 37 to be pressed in an inner periphery of the cover 11 are mounted on an inner periphery of the gasket 13, so that the gasket 13 can be mounted on the cover 11 only by inserting the claws 36, 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hub clutch device which is mounted on a front wheel of a four-wheel drive vehicle and switches between transmission and cutoff of a driving force between an axle and a wheel hub.
The present invention relates to a mounting structure for a cover of a gasket used to hermetically seal an end of a wheel hub with a cover.

[0002]

2. Description of the Related Art In a part-time type four-wheel drive vehicle, a hub clutch device is incorporated between a front wheel hub and an axle,
The transmission state of the driving force to the wheel is switched.

FIG. 4 shows a hub clutch device 1 which uses air pressure for switching of drive. A spindle 3 is extrapolated to a front wheel axle 2 and the spindle 3 is fixedly supported on a knuckle of the vehicle. Support the wheel hub 5 rotatably via the bearing 4.

[0004] At the tip of the front wheel axle 2, an inner ring 6, which is a driving member of the hub clutch device 1, is externally inserted via a serration 7 so that the rotation is integrated and freely movable in the axial direction. The external gear 8 is provided on the surface,
The outer ring 9 serving as a driven member is rotatably inserted outside the outer ring 9, and the outer ring 9 is accommodated in a cover 11 fixed to an end surface of the wheel hub 5 by a plurality of bolts 10 in a non-rotating state. Is provided with an internal gear 12 which allows the external gear 8 to be engaged and disengaged.

The front end surface of the wheel hub 5 is sealed by a cover 11 fastened by bolts 10 via a gasket 13, and the inner periphery of a diaphragm 14 whose outer periphery is fixed to the inner periphery of the cover 11 so as to be airtight is formed by an inner race 6. The inside of the cover 11 is made up of two airtight chambers 15 and 16 whose both sides are blocked by a diaphragm 14 in an airtight state. With the gasket 13,
Water and air are prevented from entering, and the inside is kept airtight.

A spring 17 for constantly pressing the inner race 6 to the retreating position is contracted between the opposed surfaces of the diaphragm 14 and the cover 11.
Is in the forward position, a magnet 19 that attracts the fixing washer 18 of the diaphragm 14 and keeps the external gear 8 detached from the internal gear 12 is fixed via a case.

[0007] The inner wheel 6 is moved so that
In order to control the switching of the wheel drive state, the hub clutch device 1 is provided with two paths of air passages 20 and 21 that respectively communicate with the airtight chambers 15 and 16.

The first air passage 20 for the outer airtight chamber 15 includes a passage 20a provided in the cover 11 so as to communicate with the airtight chamber 15, a space 20b between the spindle 3 and the wheel hub 5, and a space 20b. An air pipe 20d, which is formed by a gap in the built-in bearing 4 and a passage 20c provided at the rear end of the spindle 3 so as to communicate with the space 20b, is connected to an air source.

A second air passage 21 for the inner airtight chamber 16 has a gap 21a formed between the fitting surface of the front wheel axle 2 and the spindle 3 and a rear end of the spindle 3 communicating with the gap 21a. An air pipe 21c formed with the provided passage 21b and connected to the passage 21b is connected to an air source.

The airtight chambers 15 and 16 are covered by a cover 1 so as to press against a nut 22 screwed to the tip of the spindle 3.
The first air passage 20 is provided between the spindle 3 and the wheel hub 5, and the second air passage 21 is provided between the front wheel axle 2 and the spindle 3. By providing the passage, the space in the wheel hub 5 can be effectively used for forming the passage, and the diameter of the entire hub clutch device 1 can be reduced.

When the hub clutch device 1 is driven by four wheels,
The inner ring 6 is moved inward, and the external gear 8 meshes with the internal gear 12.

Thus, the front wheel axle 2 and the wheel hub 5
Is directly connected, and the engine brake can be applied simultaneously to the front and rear wheels.

Further, in order to switch from the four-wheel drive state to the two-wheel drive state, the air in the hermetically sealed outer airtight chamber 15 is sucked, and the inner ring is overcome by overcoming the spring 17 due to the pressure difference acting on the diaphragm 14. The external gear 8 may be disengaged from the internal gear 12 as shown in the figure by moving the magnet 6 outward and attracting the magnet 19 to the cover 11 side.

As described above, switching between the two-wheel drive state and the four-wheel drive state is performed by switching the airtight chambers 1 on both sides of the diaphragm 14.
Negative pressure or positive pressure may be applied to either 5 or 16, the two-wheel drive state is held by the attraction of the magnet 19 to the cover 11 side, and the four-wheel drive state is held by the pressing force of the spring 17. .

By the way, in the hub clutch device as described above, conventionally, the gasket 13 that is sandwiched between the wheel hub 5 and the end face of the cover 11 to prevent air leakage is attached to the cover 11 by the hub clutch. At the time of assembling the components, the components are adhered to the end face of the cover 11, and the assembly is delivered to the automobile manufacturer in this state.

[0016]

However, the method of fixing the gasket to the end face of the cover by bonding requires an additional bonding step, which lowers the efficiency of assembly.

Therefore, an object of the present invention is to eliminate the bonding step for attaching the gasket to the cover,
An object of the present invention is to provide a hub clutch capable of improving the efficiency of assembly.

[0018]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that an end of a wheel hub is
The drive member connected to the axle and the driven member connected to the wheel hub are rotatably fitted inside and outside so that the drive member and the driven member are rotatably fitted into and out of the drive member and the driven member. In the hub clutch device described above, gasket positioning grooves are provided at a plurality of positions on the inner periphery of the end where the gasket of the cover overlaps, and the grooves are provided at a plurality of positions on the inner periphery of the gasket overlapping the end surface of the cover. In this configuration, a positioning claw is provided.

According to a second aspect of the present invention, in the first aspect of the present invention, a configuration is employed in which a plurality of retaining claws for press-fitting into the inner periphery of the cover are provided at a plurality of positions on the inner periphery of the gasket. .

According to a third aspect of the present invention, in the first or the second aspect of the present invention, the drive member and the driven member are connected and disconnected by controlling the pressure fluid.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. Note that the basic structure of the hub clutch device is as described in the section of the prior art with reference to FIG. 4, and therefore only the essential points will be described.

As shown in FIGS. 1 and 2, the cover 11 has a substantially cylindrical shape with a closed end, and has axial bolt insertion holes 31 at a plurality of peripheral locations. A groove-shaped passage 20a along the outer ring 9 fitted at a position near the opening end;
And a spline groove 32 for fixing the seal 23 in a non-rotating manner, and a large-diameter step portion 33 for press-fitting the seal 23 is provided at the position of the opening end.

The gasket 13 interposed between the cover 11 and the end face of the wheel hub 5 is formed to have an inner and outer diameter equal to the end face shape of the cover 11, and the bolt 1
Zero through holes 34 are provided. Of course, the end face of the wheel hub 5 has the same shape.

The end face of the cover 11 has a passage 2 on its inner periphery.
Gasket positioning grooves 35 are provided at a plurality of locations that do not interfere with Oa. The groove 35 has a large-diameter step 33.
On the other hand, it is equal to or deeper than the thickness of the gasket 13.

A cover 1 is provided on the inner periphery of the gasket 13.
The positioning claw 36 to be fitted into the groove 35 is provided at a position corresponding to each groove 35 when the position is overlapped with the position of the end surface of the groove 1.
A bending coupling is formed so that a retaining claw 37 press-fitted between the large-diameter step portion 33 and the seal 23 is protruded toward the overlapping surface side of the cover 11 at positions on both sides of the claw 36. In addition, a notch 38 is provided at a position corresponding to the passage 20a.

The hub clutch device of the present invention has the above-described structure, and the gasket 1 is attached to the cover 11 after the components of the hub clutch are assembled in the cover 11.
In order to perform the attachment, the positioning claw 36 is inserted into the groove 35.
To the large-diameter step 33.
And the seal 23 and press the gasket 13 with the cover 1
The end face of the cover 11 can be aligned with the gasket 13 by the groove 35 and the claw 36, and the gasket can be positioned by press-fitting the claw 37 between the large-diameter step 33 and the seal 23. Reference numeral 13 is fixed to the cover 11 so as to prevent the hub clutch from falling off, and can be used for supplying a hub clutch to a manufacturer.

[0027]

As described above, according to the present invention, the gasket can be attached to the end face of the cover only by inserting the claw provided on the gasket into the cover, so that the conventional bonding step becomes unnecessary, and the hub clutch is assembled. The efficiency of the process can be improved.

Further, the press-fit retaining claws prevent the gasket from falling out of the cover during installation and during installation, and also facilitate assembly.

[Brief description of the drawings]

FIG. 1A is an exploded perspective view of a cover and a gasket,
(B) is an enlarged sectional view of a main part of the gasket attached to the cover.

FIG. 2A is a front view of a cover, and FIG.

FIG. 3A is a front view of a gasket, and FIG.

FIG. 4 is a longitudinal sectional view of a hub clutch device.

[Description of Signs] 1 Hub clutch device 2 Front wheel axle 3 Spindle 5 Wheel hub 6 Inner ring 8 External gear 9 Outer ring 11 Cover 12 Internal gear 13 Gasket 14 Diaphragm 15, 16 Airtight chamber 20, 21 Air passage 23 Seal 33 Large diameter Step 34 Through hole 35 Groove 36 Claw 37 Claw

Claims (3)

[Claims] An end of a wheel hub is sealed with a cover fastened with a gasket therebetween, and a driving member connected to an axle and a driven member connected to a wheel hub are rotatably fitted in and out of the wheel hub. In a hub clutch device configured to perform connection and disconnection of a member and a driven member, a gasket positioning groove is provided at a plurality of positions on an inner periphery of an end portion where the gasket of the cover overlaps, and a gasket A hub clutch device, wherein positioning claws are provided at a plurality of positions on the inner periphery in the grooves. 2. At a plurality of positions on the inner periphery of the gasket,
2. The hub clutch device according to claim 1, further comprising a retaining claw press-fitted into an inner periphery of the cover. 3. The driving member and the driven member are connected and disconnected by controlling a pressure fluid.
The hub clutch device as described in the above.