JPH1199841A - Hub clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily fix an outside diameter part of a gasket to a cover with small number of part items. SOLUTION: In a hub clutch device, an end part of a wheel hub is sealed by a cover 11, and 2WD is switched from 4WD by controlling the pressure fluid. A yoke 24 and a diaphragm 14 are inserted in the cover, and a cylindrical body 41 to press outside diameter parts of the yoke 24 and the diaphragm 14 against an outer ring 9 fitted in a locked condition are at a tip surface and fixed thereto, is integratedly provided on an opening end side of the cover 11. The number of part items to fix the diaphragm 14 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-operated 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 structure for fixing an outer diameter portion of a diaphragm forming an airtight chamber for switching operation between transmission and interruption.

[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. 5 shows a hub clutch device 1 that uses air pressure for switching of driving. 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.

A spring 17 that constantly presses the inner ring 6 to the retreating position is contracted between the opposed surfaces of the diaphragm 14 and the yoke 24 fixed to the cover 11, and the inner ring 6 advances toward the center of the inner surface of the cover 11. The magnet 1 which attracts the fixing washer 18 of the diaphragm 14 and keeps the external gear 8 detached from the internal gear 12
9 is fixed via a yoke 24.

[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.

The second air passage 21 for the inner airtight chamber 16 has a gap 21a formed between the front wheel axle 2 and the spindle 3, and a spindle 3 communicating with the gap 21a.
And a passage 21b provided at a rear end of the passage 21b.
The air pipe 21c connected to b 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 airtight state is maintained by a seal 23 incorporated in the inner circumference of the first hub 1 and the first passage 20 is connected to the spindle 3 and the wheel hub 5.
By providing the second passage 16 between the front wheel axle 2 and the spindle 3, the space in the wheel hub 5 can be effectively used for forming the passage, and the diameter of the hub clutch device 1 can be reduced as a whole. Become.

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 where the magnet 19 is located.

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 structure for fixing the outer diameter portion of the diaphragm to the cover 11 is such that the yoke 24 and the diaphragm 14 are provided at the inner end portion inside the cover 11 as shown in FIG. The sleeve 25 is inserted so that the outer peripheral portions overlap, and the sleeve 25 is further inserted into the cover 11.
And the outer ring 9 were inserted, and the outer diameter portion where the yoke 24 and the diaphragm 14 overlapped with each other was pressed and fixed at the end of the sleeve 25.

[0016]

In the above-described fixing structure, since the yoke 24, the diaphragm 14, the sleeve 25, and the outer ring 9 are incorporated in the cover 11 in an independent state, the number of parts is large. However, there is a problem that not only the processing cost is high, but also the assembly takes time.

Also, due to the independence of each part, it is difficult to control the size of the diaphragm crushing allowance, and a large surface pressure acts on the detent fitting portion between the aluminum cover 11 and the outer ring 9 during four-wheel drive. This causes the durability of the cover 11 to decrease.

Accordingly, an object of the present invention is to reduce the number of parts in the structure for fixing the outer diameter portion of the diaphragm and to unitize the parts, to facilitate dimensional control of the diaphragm crushing allowance, and to reduce the surface pressure between the cover and the outer ring. It is to provide a hub clutch device capable of performing the following.

[0019]

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
Seal tightly with a cover fastened with a gasket in between,
A drive member connected to the axle and a driven member connected to the wheel hub are rotatably fitted inside and outside, and two airtight chambers partitioned by a diaphragm are provided between the drive member and the driven member. In a hub clutch device configured to perform connection and disconnection of a drive member and a driven member by controlling air to an airtight chamber through an air passage communicating with the driven member, an axial extension is provided to the driven member, and This adopts a configuration in which the outer diameter portion of the diaphragm is fixed at the tip.

According to a second aspect of the present invention, the end of the wheel hub is hermetically sealed by a cover fastened with a gasket therebetween, and a driving member connected to the axle and a driven member connected to the wheel hub are rotated in and out. Two airtight chambers which are fitted to each other as possible and are separated by a diaphragm between the driving member and the driven member, and the driving member and the driven member are driven by controlling air to the airtight chamber through air passages communicating with the respective airtight chambers. In a hub clutch device for connecting and disconnecting members, a fixed member made of a metal plate is fixed to the driven member so as to be extended in an axial direction, and an outer diameter portion of a diaphragm is fixed to a tip of the fixed member. It adopts the configuration described above.

[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. 5, and thus only the essential points will be described.

1 and 2 show a first embodiment of a structure for fixing an outer diameter portion of a diaphragm. FIG. 2A shows a two-wheel drive state, and FIG. 2B shows a four-wheel drive state. .

As shown in FIG. 4, the cover 11 has a substantially cylindrical shape with a closed end, and is provided with an axial bolt insertion hole 31 at a plurality of peripheral locations, and a groove-like shape extending in the axial direction on the inner periphery. A passage 20a and a spline groove 32 for fixing the outer ring 9 fitted near the opening end in a detent shape are formed, and a large-diameter stepped portion 3 for press-fitting the seal 23 at the opening end position.
3 are provided.

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 shape of the end face of the cover 11, and the bolt 1 is provided at a plurality of locations.
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 outer diameters of the yoke 24 and the diaphragm 14 are
The outer ring 9 is set so as to just fit into the inside of the cover 11 and is inserted into the cover 11 at a position on the opening end side. Further, a cylindrical body 41 for pressing the outer diameter portion of the yoke 24 and the diaphragm 14 at the tip is integrally provided.

In the first embodiment, a cylindrical body 41 for fixing the outer diameter of the yoke 24 and the diaphragm 14 is provided.
Is provided integrally with the outer ring 9, the number of components can be reduced, and the fixing force of the outer ring 9 to the cover 11 can be increased, whereby the surface pressure of the fitting portion between the spline groove 32 of the cover 11 and the outer ring 9 can be increased. Can be reduced, and the durability of the cover 11 can be improved.

Next, a second embodiment of the diaphragm outer diameter fixing structure shown in FIGS. 3A and 3B uses a cylindrical fixing member 42 formed by pressing a steel plate.

The fixing member 42 is formed by connecting a contact plate 44 of the outer race 9 to the outer periphery of one end of the cylindrical portion 43.
A plurality of caulking claws 45 are provided around the outer ring 9, and the caulking claws 45 fitted to the notches 46 provided on the outer ring 9 are attached to the outer ring 9.
The fixing member 42 and the outer ring 9 are caulked and fixed coaxially by bending along the end surface of the fixing member 42.

The other end of the cylindrical portion 43 of the fixing member 42 is a caulking portion 47 for covering the overlapped yoke 24 and the outer diameter portion of the diaphragm 14.

In the second embodiment, the outer race 9, the yoke 24, and the diaphragm 14
Are integrated and these units can be formed, so that the work of assembling into the cover 11 can be easily performed, and the dimensional control of the crushing allowance of the diaphragm 14 becomes easy.

[0033]

As described above, according to the present invention, the configuration as described above has the following effects.

Since the yoke and the diaphragm are pressed and fixed by the cylindrical body provided integrally with the outer ring, the number of components of the structure for fixing the outer diameter portion of the diaphragm can be reduced, and the cylindrical part is fixed to the cover by the outer ring. , And the surface pressure between the cover and the outer ring is reduced, thereby improving the durability of the cover.

According to a second aspect of the present invention, one end of the cylindrical fixing member is fixed by caulking to the outer ring, and the outer diameter of the yoke and the diaphragm is fixed by caulking to the other end of the fixing member, so that the outer ring, the yoke and the diaphragm can be unitized. , It can be easily incorporated into the cover, and the dimensional control of the diaphragm crushing fee becomes easy,
It can be easily airtightly incorporated into the cover.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a hub clutch device.

FIG. 2A is a cross-sectional view of a two-wheel drive state in which main parts are enlarged, and FIG. 2B is a cross-sectional view of a four-wheel drive state.

FIG. 3A is a cross-sectional view of a main part of a second driving state of a hub clutch device according to a second embodiment of the present invention, and FIG.

FIG. 4 is an exploded perspective view of a cover and a gasket.

FIG. 5 is a sectional view showing a conventional hub clutch device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 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 24 Yoke 41 Cylindrical body 42 Fixing member 43 tubular part

Claims (2)

[Claims] An end of a wheel hub is hermetically 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 inside and outside. Providing two airtight chambers partitioned by a diaphragm between the drive member and the driven member, and connecting and disconnecting the drive member and the driven member by controlling air to the airtight chamber through an air passage communicating with each airtight chamber. A hub clutch device characterized in that an axially extending portion is provided on the driven member, and an outer diameter portion of the diaphragm is fixed at a tip of the extended portion. 2. An end of the wheel hub is hermetically sealed by a cover fastened with a gasket therebetween, and a driving member connected to the axle and a driven member connected to the wheel hub are rotatably fitted inside and outside. Providing two airtight chambers partitioned by a diaphragm between the drive member and the driven member, and connecting and disconnecting the drive member and the driven member by controlling air to the airtight chamber through an air passage communicating with each airtight chamber. In the hub clutch device, a fixed member made of a metal plate is fixed to the driven member so as to be extended in the axial direction, and an outer diameter portion of a diaphragm is fixed to a tip of the fixed member. Hub clutch device.