JP3535622B2 - Hub clutch device - Google Patents

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 the front wheels of a four-wheel drive vehicle and switches between transmission and interruption of driving force between an axle and a wheel hub.

[0002]

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

In a conventional hub clutch device, a slide gear fitted to an axle is axially movable, and this gear is engaged and disengaged from a wheel hub, and when engaging, a four-wheel drive in which the axle and the wheel hub are directly connected. It has a structure in which the two wheels are driven when the vehicle is disengaged, and pressure fluid, for example, air pressure is used to switch the drive.

[0004]

By the way, when the movement of the slide gear is controlled by the air pressure, it is necessary to constantly maintain the air pressure in order to maintain the state of either the four-wheel drive or the two-wheel drive. Therefore, there is a problem that pressure is constantly applied to the seal provided on the hub or the spindle portion, the seal is worn out and durability is deteriorated.

Therefore, an object of the present invention is to provide four-wheel drive and two-wheel drive.
(EN) Provided is a hub clutch device capable of improving the durability of a seal by applying a fluid pressure only when switching wheel drive and eliminating the need to hold a coupling member by the fluid pressure at other times. It is in.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 rotatably fits a drive member connected to an axle and a driven member connected to a wheel hub inward and outward, and Between the driving member and the driven member, an engaging member that engages between the driving member and the driven member when the driving member and the driven member relatively rotate, and a retainer for the engaging member that is rotatable relative to the driving member and the driven member. And a rotational force applying means for rotating the retainer relative to the drive member so that the engaging element moves to the engagement operating position, are connected to the retainer, and the fluid between the retainer and the driven member is connected to the retainer. Providing a connecting member that moves between a position for connecting the retainer and the driven member and a position for separating by the pressure,
One of the coupling position and disconnected position of the coupling member and held by the pressing elastic spring, spool and the other
The above-mentioned coupling member is configured to be held by the attraction of a magnet having a greater attraction force than the elasticity of the ring.
The movement of the connection between the connecting position and the separating position of the
Negative or positive pressure in either one of the chambers on both surfaces
Moving the coupling member in the axial direction by applying the fluid of
And make this fluid work only when switching.
This is the structure adopted.

According to a second aspect of the present invention, a drive member connected to the axle and a driven member connected to the wheel hub are rotatably fitted in and out, and driven by fluid pressure between the drive member and the driven member. A connecting member that moves between a position where the member and the driven member are connected and a position where the driven member is disconnected is provided, and a spring is used to elastically move toward a position where the driven member is connected to the connecting member .
Urges I, the disconnect position of the coupling member, spring
It is held by the attraction of a magnet that is set to an attraction force larger than the elasticity of the
Move the bond at the disconnection position to the position on both surfaces of the connecting member.
Apply negative or positive pressure fluid to either of the chambers
By moving the connecting member in the axial direction.
The configuration is such that the fluid acts only when switching .

According to a third aspect of the present invention, in the second aspect of the present invention, the drive member is composed of a movable inner ring that is fitted onto the axle by serration coupling. A pair of gears that are engaged and disengaged by the movement of the movable inner ring in the axial direction are provided on the surfaces, and the movable inner ring is moved in the axial direction by controlling the fluid that acts on both surfaces of the coupling member to disengage the pair of gears. It is configured to do so.

[0009]

[0010]

Here, the fluid for moving the connecting member uses negative pressure or positive pressure of air, and it acts on the connecting member only at the time of switching between four-wheel drive and two-wheel drive, and is returned to atmospheric pressure after switching. . The four-wheel drive state is maintained by the pressing elasticity of the spring, and the two-wheel drive state is maintained by the attraction force of the magnet to the lid of the driven member or the drive member.

Further, the sprag incorporated between the drive member and the outer wheel transmits the rotation of the wheel to the front wheel hub during four-wheel drive and stops the free running function when the rotation of the front wheel hub exceeds the axle, The brake works.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
This will be described together with the illustrated example.

In the first example shown in FIGS. 1 to 8, 1
Is a hub clutch device, 2 is a front wheel axle of a four-wheel drive vehicle, and the front wheel axle 2 is composed of a shaft portion of a constant velocity joint 3 connected to a drive system of the vehicle.

A spindle 4 is fitted onto the front wheel axle 2, the spindle 4 is fixedly supported by a knuckle 5 of the vehicle, and the spindle 4 is rotatable around a wheel hub 8 via tapered bearings 6 and 7. Support.

As shown in FIGS. 2 and 3, an inner ring 9 which is a driving member of the hub clutch device 1 is provided at the tip of the front wheel axle 2.
Is externally inserted through the serration groove 10 so as to be integrally rotatable in the axial direction, and the outer ring 13 serving as a driven member is rotatably externally fitted to the outer side of the inner ring 9. The rear end surface is fixed to the end surface of the wheel hub 8 by a plurality of bolts 14, and a two-way clutch 15 is incorporated between the inner peripheral surface of the outer ring 13 and the inner ring 11.

This two-way clutch 15 is shown in FIGS.
As shown in, the inner diameter surface of the outer ring 13 and the outer diameter surface of the inner ring 9 are formed into concentric cylindrical surfaces 16 and 17, and both cylindrical surfaces 16 and
A large-diameter cage 18 and a small-diameter cage 19 are built in between 17.

As shown in FIGS. 2 and 3, the large-diameter cage 18 is accommodated so as to be rotatable relative to the outer ring 13 and the inner ring 9, while the small-diameter cage 19 has a distal end portion on the inner diameter side. A bent portion 20 that bends toward the side is formed, and the bent portion 2
0 is in sliding contact with the end surface of the inner ring 9, and the bent portion 2
A crimp spring 21 made of a disc spring is crimped to 0. The crimping spring 21 presses the bent portion 20 toward the end surface of the inner ring 9, and holds the small-diameter retainer 19 on the inner ring 9 by the frictional force generated by the pressing force. Reference numeral 22 in the figure is a retaining ring for stopping the pressure spring 21.

The large diameter cage 18 and the small diameter cage 1 are also provided.
As shown in FIG. 7, a plurality of pockets 23, 24 are formed on the peripheral surface of the pipe 9 so as to face each other in the radial direction.
A sprag 25 as an engaging element and a spring 26 holding the sprag 25 are incorporated in the parts 3 and 24.

This sprag 25 has an outer diameter side and an inner diameter side.
Left and right symmetrical arc surface 2 with different centers of curvature
7 and 27a are formed, and when they are inclined at a predetermined angle in both left and right directions, they engage with both cylindrical surfaces 16 and 17, and the outer ring 13 and the inner ring 9 are integrated. Further, one end of the spring 26 is supported by the large-diameter cage 18 and presses the sprag 25 from both sides.
5 is held in a position where it engages with the cylindrical surfaces 16 and 17.

Slits 28, 2 penetrating in the radial direction are formed on the peripheral surfaces of the large diameter cage 18 and the small diameter cage 19, respectively.
9 is formed, and the slits 28 and 29 are engaged with both ends of a switch spring 30 having a C-shaped ring shape. The switch spring 30 is set in a state of being contracted in the circumferential direction, one end of which is attached to the large diameter retainer 18 and the other end of which is pressed against the small diameter retainer 19, and the spring force of both retainers 18, 19 is given a circumferential force.

Here, due to the spring force of the switch spring 30, the retainers 18 and 19 and the sprag 25 are in a standby state at a meshing position in one direction of rotation.
In the above structure, the switch spring 30 constitutes a rotational force applying means for applying a rotational force in one direction to the large diameter cage 18.

A support metal 31 is incorporated between the outer ring 13 of the two-way clutch 15 and the rear end of the inner ring 9 between the rear end of the inner ring 9 of the two-way clutch 15 and the tapered bearing 6.
A spacer 32 that is fitted onto the spindle 4 is provided.
An oil seal 33 is incorporated between the outer ring 13 and the inner peripheral surface of the rear end portion of the outer ring 13.

A lid 34 for sealing the tip surface is fixed to the tip surface of the outer ring 13, and the lid 34 has a cylindrical cylinder chamber 35 whose outer end side is closed, which is just fitted in the outer ring 13. A circular ring-shaped slider 36 is accommodated in the cylinder chamber 35 so as to slide in the axial direction via a seal ring 37 fitted on the outer periphery, and two chambers 38 and 39 are blocked on both sides by the slider 36. Is formed.

Gear teeth 40 are formed at predetermined intervals in the circumferential direction at the tip of the large-diameter cage 18 in the two-way clutch 15, as shown in FIG.
5, gear teeth 41 are formed on the rear end of the slider 5 under the same conditions, and the outer periphery of the rear end of the slider 36 meshes with both gear teeth 40 and 41 and is movable along the gear teeth 41 of the lid 34. Gear teeth 42 are provided.

Therefore, when the slider 36 moves forward, the gear teeth 42 of the slider 36 mesh with both the gear teeth 40 of the large-diameter cage 18 and the gear teeth 41 of the lid 34, and the large-diameter gear teeth are passed through the slider 36. Holder 18 and lid 34
When the slider 36 is moved backward while the outer ring 13 is integrally connected, the connection between the large diameter retainer 18 and the lid 34 is released.

The slider 36 and the two-way clutch 1
5, the slider 36 is constantly pressed toward the tip side between the ring-shaped washer 43 arranged on the tip end surface of the spring 5, and the spring 44 for holding the position where the large diameter cage 18 and the lid 34 are disengaged is contracted. The magnet 45 is fixed to the rear end of the slider 36 at a position facing the front end surface of the inner ring 9.

The magnet 45 is attached to the inner ring 9 when the slider 36 moves rearward and the gear teeth 42 of the magnet 45 are in a position where they disengage from the gear teeth 40 and 41 of the large diameter cage 18 and the lid 34. The magnet 45 holds the position where it is attracted and released from the bond. At this time, the magnet 45 overcomes the repulsive force of the compressed spring 44 and the slider 3
The magnetic force is set to hold 6.

In order to control the switching between the two-wheel drive state and the four-wheel drive state by moving the slider 36, as shown in FIG.
As described above, the air passage 46 is provided in the outer ring 13 so as to penetrate in the axial direction and communicate with the outer chamber 38 through the notch 71 of the lid 34. The air passage 46 is, as shown in FIGS. 1 and 8, a space between the spindle 4 and the wheel hub 8, an inside of the tapered bearings 6 and 7 incorporated in this space, and an air pipe connected to the space at the rear end of the spindle 4. It is connected via 47 to an air source (not shown) that switches the supply and discharge of negative pressure or positive pressure air by remote control from a transfer of a four-wheel drive vehicle.

The inner chamber 39 has a two-way clutch 1
The gap formed inside 5 and the gap formed between the fitting surfaces of the front wheel axle 2 and the spindle 4 are used as air passages, and an air pipe 48 is provided at the rear end of the spindle 4 so as to communicate with the gap. Connected to air source.

A circular shaft 49 is provided so as to project from the center of the inner surface of the lid 34, and the inner end of the inner ring 9 is provided with a metal 50 between which the circular shaft 49 is inserted.
The inner diameter of the slider 36 is fitted to the circular shaft 49, and a seal ring 51 which is in sliding contact with the circular shaft 49 is fitted to the inner peripheral surface of the slider 36.

A fail-safe button screw 52 is rotatably attached to the center of the outer surface of the lid 34, and
9. At a plurality of locations around the periphery of the enclosure 9, a lid 34 and a slider 36 are provided.
A plurality of pins 53 are arranged so as to be airtight so as to be movable in the axial direction, and the rear end of each pin 53 has a slider 3
6 has an engaging end in the axial direction, and the tip of each pin 53 has a screw head fitted to a feed screw formed on the outer peripheral surface of the button screw 52, so that the button 52 can be rotated. Thus, each pin 53 is moved in the axial direction.

When the pins 53 are in the backward moving position, they do not interfere with the forward / backward movement of the slider 36 and the slider 3
In the two-wheel drive state in which the magnet 45 of No. 6 is attracted to the inner ring 9, if the driver fails to rotate due to air leakage in the air passage or the like, when the driver rotates the button 52, the pins 53 move outward and move forward. The pin 53 forcibly separates the magnet 45 from the inner ring 9 via the slider 36, and the spring 4
4, the slider 36 is moved outward, and the gear teeth 42 are fitted to the lid 34 and the gear teeth 40 and 41 of the large-diameter retainer 118, so that the four-wheel drive state can be obtained.

The hub clutch device according to the first example of the present invention has the above-described structure. Next, the running state of the vehicle using this device will be described.

In the two-wheel drive state, as shown in FIGS. 3 and 4 (A), the magnet 45 is attracted to the inner ring 9, the spring 44 is compressed to hold the slider 36 in the retracted position, and the gear teeth 42 thereof are held. Is separated from the gear teeth 41 of the lid 34.

When the vehicle travels forward in this state, the two-way clutch 15 moves the sprag 25 to the engagement operating position in the forward direction.

In the state where the sprag 25 is moved to the engagement operation position as described above, when the outer ring 13 is rotated at a speed higher than the rotational speed of the axle, the sprag 25 releases the engaged state and the outer ring 13 is free. You can run.
For this reason, the driving force is not transmitted from both the engine and the tires to the front wheel axle 2 which has been separated from the power by the transfer, and only the rear wheels run, so the drive system from the transfer to the front wheel axle is stopped. Can be made.

When driving on a road surface having a low coefficient of friction, such as a snowy road, by four-wheel drive, the air in the chamber 38 sealed by the air pipe 47 as shown in FIG. The magnet 45 is struck by the attractive force to be separated from the inner ring 9, and the slider 36 is moved outward by the pressing force of the spring 44, and its gear teeth 42 are
The cover 34 and the large-diameter cage 18 are engaged with each other over both gear teeth 40 and 41. The negative pressure is set only for the time required for switching, and is returned to atmospheric pressure after switching.

As a result, the outer ring 13 and the large diameter retainer 18 are integrated, and the large diameter retainer 18 rotates in the same direction as the outer ring 13. Therefore, even when the sprag 25 is in the free running state as shown in FIG. 7, the inclination of the sprag 25 is changed by the rotation of the large-diameter retainer 18 and the inner and outer rings 9, 13 are rotated.
When the outer ring 13 is connected to the cylindrical surfaces 16 and 17, the free running of the outer ring 13 is stopped. Therefore, the outer wheel 13 and the front wheel axle 2 are directly connected to each other, and the front and rear wheels are directly connected to be in a four-wheel drive state, and the engine braking can be simultaneously applied to the front and rear wheels.

On the other hand, when driving on a road surface having a high friction coefficient such as a paved road by four-wheel drive, as shown in FIG. 2, the air in the chamber 43 is sucked, the slider 36 is moved rearward, and the magnet 45 is moved to the inner ring 9. The gear teeth 42 are disengaged from the gear teeth 41 of the lid 34, and the outer ring 13 and the large diameter cage 18 are separated from each other.

As a result, four-wheel drive is performed in the forward direction, and the free running function operates according to the rotation difference between the drive side and the driven side.

That is, when the vehicle turns and has a snake angle,
Due to the difference in turning distance between the front wheel and the rear wheel, the outer wheel 13 connected to the front wheel rotates faster than the inner wheel 9, and the outer wheel 13 is sprag 2
Free run for 5. Therefore, the front wheel and the rear wheel are separated and rotate, and the braking phenomenon at the tight corner does not occur.

When the rear wheels slip while the vehicle is traveling forward with the two rear wheels, the rotation of the front wheel axle 2 exceeds that of the front wheels, which decelerates as the vehicle speed decreases. When engaged, the outer ring 13 and the inner ring 9 are integrated. As a result, the driving force is applied to the front wheels, and the four-wheel drive is automatically selected.

As described above, the hub clutch device of the first example can widely cope with the ever-changing road surface changes during traveling, and can perform stable traveling like a full-time four-wheel drive vehicle. You can

Further, in driving the slider 36 by air, it is not necessary to always keep the negative pressure or the positive pressure to hold the coupling member, and when the slider 36 moves, the negative pressure or the positive pressure is used to switch. Since air is used for the above, the control structure of the air supply source can be simplified, and wear of the seal portion such as the hub portion and the spindle portion can be suppressed.

Further, since the air can be led in and out of the sealed chambers 38 and 39 by communicating the air passages with the chambers 38 and 39, it is possible to easily cope with it by only making a hole in the outer ring 13. Therefore, it is possible to eliminate the need for complicated processing and molding for the knuckle, the constant velocity joint, and the like.

Next, a second example shown in FIGS. 9 and 10 will be described. This second example corresponds to the 2 in the first example described above.
The operation of the slider for switching between four-wheel drive and four-wheel drive is reversed from that of the first example. The same parts as those in the first example are denoted by the same reference numerals and will not be described.

In the second example, a spring 44 for pressing the slider 36 toward the retracted position on the inner ring 9 side is contracted between the opposing surfaces of the slider 36 and the lid 34, and
A magnet 45 that attracts and holds the slider 36 at the forward position is fixed to the inner surface of the lid 34.

Further, the gear teeth 41 provided on the lid 34 and the gear teeth 40 provided on the large diameter retainer 18 mesh with each other when the slider 36 is in the retracted position, and the gear teeth 42 mesh with both gear teeth 40, 41. When the lid 34 is connected to the large-diameter retainer 18 and the slider 36 is in the forward position, the gear teeth 4
2 is provided so as to be disengaged from the gear teeth 40 of the large diameter cage 18.

In the fail-safe mechanism of the second example, the screw plate 62 is screwed into the screw hole 61 provided on the outer surface of the central portion of the lid 34, and the screw plate 62 is rotated to make the lid 34 airtight. By moving a plurality of pins 63 passing through the
The slider 36 attracted to the magnet 45 is pressed by the pin 63 and separated from the magnet 45.

The second example has the above-mentioned configuration and is shown in FIG.
When the slider 36 is in the forward position, the lid 3
When the slider 4 is in the retracted position as shown in FIG. 10 as a result of the connection between the 4 and the large diameter cage 18 being released, and the slider 36 being in the retracted position, the lid 34 and the large diameter cage 18 are directly connected and the 4WD is driven. It becomes a running state. The switching between the two-wheel drive and the four-wheel drive is performed in the same manner as in the first example, in the chambers 38 on both sides of the slider 36.
Negative pressure or positive pressure may be applied to 39.

Next, a third example shown in FIGS. 11 and 12 will be described. In the third example, a gear is used instead of the two-way clutch in the first example described above, and the front wheel axle and the outer wheel can be directly connected. The same parts as those in the first example are designated by the same reference numerals and will not be described.

In the third example, an inner ring 9a serving as a driving member is attached to the front end portion of the front wheel axle 2 through a serration groove 10 so that the inner ring 9a can rotate integrally and move in the axial direction. The outer gear 13 is provided on the outer peripheral surface of the outer ring 13 and is rotatably fitted on the inner ring 9a.
An internal gear 82 is provided on the inner peripheral surface of which the external gear 81 can engage and disengage.

A slider 36 is fitted inside the outer ring 13 at a position on the tip side so as to be movable in the axial direction.
Is fixed so as to move integrally with the inner ring 9a in the axial direction, and the inner ring 9 is provided between the facing surfaces of the slider 36 and the lid 34.
A spring 44 that constantly presses a toward the retracted position is contracted.

At the center of the outer surface of the slider 36, a magnet 45 is attached to the lid 34 when the inner ring 9a is in the forward position and holds the case 83 in which the external gear 81 is separated from the internal gear 82. Is fixed through.

Further, in the fail-safe mechanism in the third example, the pin case 84 fixed to the central portion of the lid 34 supports the pin 85 so as to be movable in the axial direction.
The magnet 45 is pulled away from the lid 34 by pushing 5, and the spring 44 causes the slider 36 and the inner ring 9 to move.
The external gear 81 is meshed with the internal gear 82 by moving a.

The hub clutch device of the third example is configured as described above, and when the four wheels are driven, the slider 36 and the inner ring 9a are moved rearward to drive the external gear 8 as shown in FIG.
1 is meshed with the internal gear 82.

As a result, the front wheel axle 2 and the outer wheel 13 are directly connected to each other so that the four-wheel drive state is established, and the engine braking can be simultaneously applied 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 sealed chamber 38 is sucked, and the negative pressure acting on the slider 36 overcomes the spring 44 to overcome the slider 36. The external gear 81 may be disengaged from the internal gear 82 by moving the inner ring 9a outward and attracting the magnet 45 to the lid 34.

As described above, the two-wheel drive state and the four-wheel drive state can be switched by applying a negative pressure or a positive pressure to either of the chambers 38 or 39 on both sides of the slider 36. The driving state is held by the attraction of the magnet 45 to the lid 34, and the four-wheel driving state is held by the pressing force of the spring 44.

Therefore, it is not necessary to apply a negative pressure or a positive pressure after the switching operation, and the air passage can be set to return to the atmospheric pressure after the switching, so that the hub portion or the spindle portion is sealed. Pressure can be applied in a short time, and the durability of the hub and spindle seals can be improved.

In any of the examples, in switching between the two-wheel drive state and the four-wheel drive state, the side on which the pressure is applied to the chambers 38 and 39 is reversed between the case where a negative pressure is used and the case where a positive pressure is used. Become.

[0063]

As described above, according to the present invention, the combination
The position of the member that is connected to the four-wheel drive state and the two-wheel drive state
The elastic force of the spring
Held by and the other is greater than the elasticity of the spring
Hold by attracting the magnet set to attractive force
The connecting position of the connecting member and the separating position.
The movement of the coupling of the mounting device to the chambers at the positions of both surfaces of the coupling member.
Applying negative pressure or positive pressure fluid to one of the
This material is cut by moving the material in the axial direction.
Since it is made to act only when changing, it is a four-wheel drive
Uses pressure fluid only when switching between two-wheel drive and two-wheel drive
Would it suffices, after switched can be returned to atmospheric pressure, Thus only a brief time to use the pressure fluid, there is no problem in the durability of the seal, conventional seal can be used as it is .

By incorporating the hub clutch device of the present invention between the front wheels and axles of a four-wheel drive vehicle, two-wheel drive can be performed while the front-wheel drive system is disconnected, and front and rear wheels can be directly connected during four-wheel drive. It has excellent fuel efficiency and quietness,
There is an effect that it is possible to realize four-wheel running that can accurately respond to changes in the road surface.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view showing a first example of a hub clutch device for a four-wheel drive vehicle.

FIG. 2 is a vertical cross-sectional view of a two-wheel drive state in which an essential part of the same is enlarged.

FIG. 3 is a vertical cross-sectional view of a four-wheel drive state in which an essential part of the same is enlarged.

4A is an enlarged cross-sectional view showing a two-wheel drive state of a switching portion, FIG. 4B is a cross-sectional view taken along arrow BB of FIG.
(C) is an enlarged cross-sectional view showing the four-wheel drive state of the switching portion.

FIG. 5 is a cross-sectional view showing a sprag portion of a two-way clutch.

FIG. 6 is a cross-sectional view showing a switch spring portion of a two-way clutch.

FIG. 7 is an enlarged sectional view showing a sprag portion of a two-way clutch.

8 is a vertical cross-sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is a vertical sectional view showing a second example of the hub clutch device during two-wheel drive.

FIG. 10 is a vertical sectional view of the same four-wheel drive system.

FIG. 11 is a vertical sectional view showing a third example of the hub clutch device during two-wheel drive.

FIG. 12 is a vertical sectional view of the same four-wheel drive system.

[Explanation of symbols]

1 Hub clutch device 2 front wheel axle 4 spindles 9, 9a inner ring 13 outer ring 15 two-way clutch 18 Large diameter cage 19 Small diameter cage 25 sprags 34 Lid 36 Slider 37,51 Seal ring 40, 41, 42 gear teeth 44 spring 45 magnet 81 External gear 82 Internal gear

Continuation of front page (56) Reference JP-A-59-37340 (JP, A) JP-A-7-208502 (JP, A) JP-A 1-122733 (JP, A) Jitsukaihei 4-83924 (JP , U) Actually open 56-56930 (JP, U) Actually open 5-22153 (JP, U) Actually open 60-47629 (JP, U) Actually open 2-143523 (JP, U) Actually open 4-91518 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60K 23/00-23/08 F16D 11/04

Claims (3)

(57) [Claims] 1. When a driving member connected to an axle and a driven member connected to a wheel hub are rotatably fitted in and out, and the driving member and the driven member are relatively rotated between the driving member and the driven member. An engaging element engaged between the two members, and a retainer for the engaging element that is rotatable relative to the driving member and the driven member, so that the engaging element moves to the engaging operation position. Is connected to a rotational force applying means for rotating the retainer relative to the drive member, and between the retainer and the driven member,
A connecting member that moves between a position where the retainer and the driven member are connected and a position where the driven member is separated by the pressure of the fluid is provided, and one of the connecting position and the separating position of this connecting member is pressed by the spring elasticity. Hold the other side of the spring
Hold it by the attraction of the magnet, which is set to the attraction force larger than the elasticity, and connect the above-mentioned coupling member.
The movement of the bond between the position where
Negative pressure or positive pressure fluid to either one of the chambers
By moving the coupling member in the axial direction.
A hub clutch device adapted to actuate this fluid only when switching . 2. A drive member connected to an axle and a driven member connected to a wheel hub are rotatably fitted in and out, and the drive member and the driven member are interposed between the drive member and the driven member by fluid pressure. the coupling member which moves between a position to separate the coupling position is provided, the movement elasticity toward a position for coupling to the coupling member to bias by a spring, the disconnect position of the coupling member, than the elasticity of the spring big
It is held by attracting a magnet set to a different attractive force, and the joining position of the joining member and the joining position are separated.
Movement of one of the chambers located on both surfaces of the coupling member
The negative or positive pressure fluid acts on one side to axially move the coupling member.
Direction, and when switching this fluid
Hub clutch device designed to act only on the . 3. The drive member is composed of a movable inner ring that is fitted onto the axle and is serration-coupled, and the movable inner ring is moved in the axial direction between the outer periphery of the movable inner ring and the inner peripheral surface of the outer ring that is a driven member. 3. The hub according to claim 2, wherein a pair of gears that engage and disengage with each other are provided, and the movable inner ring is axially moved by controlling the fluid that acts on both surfaces of the coupling member to engage and disengage the pair of gears. Clutch device.