JPH0243785Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hub clutch, and particularly to a hub clutch that prevents rattling and seizing of wheel bearings.

[Conventional technology]

Hub clutches are installed on the wheel hubs of part-time four-wheel drive vehicles and are used to reduce fuel consumption and prevent wear on each rotating part by eliminating unnecessary rotation of the front system during two-wheel drive. It is something that The brake member of the hub clutch moves the slide gear in the axial direction by applying relative rotation between the cam mechanism and the retainer that holds the cam mechanism, thereby connecting and disconnecting the wheel hub and the drive shaft. It is used to brake the rotation of the retainer.

For example, FIG. 2 is an explanatory diagram of the configuration of a conventional hub clutch, in which a shows the clutch off (two-wheel drive) state, b shows the clutch on (four-wheel drive) state, and the drive shaft 101, drive A slide gear 103 that is coupled to the drive shaft 101 via a gear 102 and is movable in the axial direction, a gear portion that is engaged with the slide gear 103 on the inner periphery, and a wheel hub 119 on the outer periphery that is connected to the drive shaft 101 by bolts 120. a housing 104 coupled to the housing 104; a cam 105 having a plurality of protrusions (not shown) on the left side in the axial direction and spline-coupled to the slide gear 103 so as to be movable over a predetermined distance in the axial direction; a protrusion of the cam; A retainer rotatably disposed outside the drive gear 102 in the radial direction and having a plurality of V-shaped grooves (not shown) that engage with the drive gear 102 and a plurality of V-shaped protrusions (not shown) on the left side in the axial direction. 125, a brake 124 having a plurality of V-shaped grooves (not shown) that engages with the V-shaped projections of the retainer and a conical friction surface on the left side in the axial direction so as to be movable in the axial direction; A lock washer 123 (a coil spring 126 between the retainer 125 and the brake 124
and the brake 124 locks and washers 12.
3), cam 10
5 to the left in the axial direction
4. The second coil spring 115 has a smaller spring force than the first coil spring and presses the slide gear 103 to the right in the axial direction. Note that 126 is a wheel bearing.

In the above configuration, the drive shaft 101
When the cam 105 is driven, the cam 105 rotates via the drive gear 102 and the slide gear 103, so a relative rotation occurs between the retainer 125, which is lightly braked by the brake 124, and the cam 105. The first coil spring 114 is compressed by the thrust force in the axial direction, and the slide gear 103 is moved to the right by the elastic force of the second coil spring 115, thereby engaging the clutch. On the other hand, if the drive shaft 101 is stopped and driven in the opposite direction from the wheel side, the cam 1
05 relative to the retainer 125 forces the slide gear 103 to the right (Fig. 2b)
The clutch is disengaged by returning to the position shown in FIG. 2a based on the elastic force of the first coil spring 114.

However, the conventional brake member 124
For example, as shown in FIG. 2 (a is a configuration explanatory diagram showing a two-wheel drive state and b is a configuration diagram showing a four-wheel drive state), a lock washer 123 is fixed via a bolt 122 to a nut 121 that fixes a wheel bearing 126. Since the structure has a conical friction inner circumferential surface that directly engages with the conical friction surface of the nut 121, if an excessive load occurs on the brake member 124,
There was a risk that the nut 121 would become loose, causing play in the wheel bearing 126, or that the nut 121 would be excessively tightened, causing problems such as seizure of the wheel bearing.

[Means and actions for solving problems]

This invention was made in view of the above,
In case of excessive load on the brake components,
Wheel damage due to loose nuts or excessive tightening
In order to prevent the bearing from rattling or seizing, a cam mechanism is provided that is slidable in the axial direction of the drive shaft and that rotates together with the drive shaft by engaging with a slide gear that is integrally fitted on the outside in the rotation direction. and a retainer that is braked by a brake member when driven to generate an axial thrust force on the cam mechanism, and is fixed to the slide gear and the wheel hub by moving the slide gear in the axial direction based on the thrust force. A hub and a gear part provided on the inner periphery of the housing are engaged with a clutch or released from the clutch.
In the clutch, the brake member is prevented from rotating by a first brake member that brakes the retainer when the brake is applied, and a keyway of a stationary spindle, and is engaged with a wheel bearing nut to prevent axial movement. The present invention provides a hub clutch comprising a second brake member for braking the first brake member coupled to a restricted lock washer via an engagement member.

〔Example〕

Hereinafter, the hub clutch according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment according to the present invention.
FIG. A slide gear 3 having a gear part 3a on the inner circumferential part and movable in the axial direction, and a gear part 3 on the inner peripheral part.
The housing 4 has a gear portion 4a that is engaged with the wheel hub 5, and has an outer peripheral portion fixed to the wheel hub 5 via a bolt 6, and a plurality of protrusions (not shown) on the left side in the axial direction. , and a cam 7 spline-coupled to the slide gear 3 so as to be movable over a predetermined distance in the axial direction, a plurality of V-shaped grooves that engage with projections of the cam 7, and a plurality of V-shaped grooves on the left side in the axial direction. A retainer 8 having a projection and rotatably disposed on the outside of the drive gear 2, a plurality of V-shaped grooves that are engaged with the V-shaped projections of the retainer 8, and a conical friction outer periphery to the left in the axial direction. It has a first brake member 9 having a surface and is movable in the axial direction, and a conical inner circumferential surface that engages with the first brake member 9, and has a predetermined strength for a lock washer 11 to be described later. A second brake member 10 is connected to the second brake member 10 via an engaging member 12, which is connected to the second brake member 10, and a nut 15 that is disposed on the outside of the spindle 13 in the radial direction and fixes the wheel bearing 14. A lock washer 11 for stopping the lock, an elastic member 16 having a relatively small spring force and disposed between the retainer 8 and the first brake member 9, and a predetermined spring force for adjusting the radius of the slide gear 3. A first coil spring 17 that is coaxially arranged outward in the direction, has one end seated on the retainer 8, and the other end seated on the cam 7 to press the cam 7 to the left in the axial direction.
and a second coil spring 18 that has a smaller spring force than the first coil spring and presses the slide gear 3 to the right in the axial direction. Note that the engaging member 1
As for 2, a shear pin having a predetermined shear strength can be used.

FIG. 1b is a partial cross-sectional view of the lock washer 11, showing the keyway 13a of the spindle 13 disposed on the radially outer side of the drive shaft 1.
, the key 11 for preventing rotation of the lock washer 11
a is fitted. Also, Lock Washia 1
The claw portion 11b of No. 1 is fitted into the groove portion 15b of the nut 15.

In the above configuration, in the two-wheel drive state shown in Figure 1a, the shift lever (not shown) on the driver's seat is pressed.
When switching from 2WD (two-wheel drive) to 4WD (four-wheel drive), the drive shaft 1 begins to rotate. When the drive shaft 1 rotates, the drive gear 2 and slide gear 3 also rotate together with the cam 7. In this case, the cam 7 engages with the retainer 8, and the retainer 8 also tries to rotate. For this reason, retainer 8
As a result, the first brake member 9 also tends to rotate. However, the conical outer peripheral surface of the first brake member 9 and the conical inner peripheral surface of the second brake member 10 are in slight contact with each other due to the elastic member 16, and the second brake member 10 is prevented from rotating by the fixed spindle. Since it is connected to the lock washer 11 via the engaging member 12, the first brake member 9 is connected to the second brake member 9 due to the wedge action between the V-shaped protrusion of the retainer 8 and the V-shaped groove of the first brake member 9. It is pressed against the conical inner peripheral surface of the brake member 10, thereby increasing its braking force. This increase in braking force further increases the wedge action (axial thrust force) to provide a predetermined braking force. As described above, the second brake member 10 is
Since it is connected to the lock washer 11, which is prevented from rotating, through the engagement member 12, it does not rotate, so the first brake member 9 and furthermore the retainer 8 are braked and their rotation is suppressed. As a result, relative rotation occurs between the cam 7 and the retainer 8,
A thrust force in the axial direction is generated, and the cam 7 is moved from the position shown in FIG. 1(a) to a predetermined position on the right side in the axial direction while compressing the first coil spring 17. Compressed second coil spring 18
Due to the stored elastic energy, slide gear 3
is moved to the right in the axial direction, and the gear portion 3a of the slide gear 3 and the gear portion 4a of the housing 4 engage with each other.
As a result, the drive shaft 1 and the housing 4 are coupled via the slide gear 3, resulting in a four-wheel drive state.

If you want to change from 4-wheel drive to 2-wheel drive, switch the shift lever on the driver's seat from 4WD to 2WD.
Move the car slightly in the opposite direction from where it was previously traveling. In this case, the slide gear 3, drive gear 2, and drive shaft 1 are rotated by the housing 4 as the wheels rotate, but the retainer 8 is fixed by the first brake member 9 and the second brake member 10. , the retainer 8 and the cam 7 rotate relative to each other, and the cam 7 is moved to the left in the axial direction by the action of the first coil spring 17. Therefore, the slide gear 3 moves to the left while extending the second coil spring 18 to the position shown in FIG. 1(a).
As a result, the connection between the housing 4 and the drive shaft 1 is released via the slide gear 3, and the rotation of the drive shaft 1 is stopped, resulting in a two-wheel drive state.

During the above operation, the second brake member 10
The load applied to the lock is transmitted to the lock washer 11 and the fixed spindle 13 via the engagement member 12,
Since it is designed to provide resistance, if an excessive load occurs on the second brake member 10, the engaging member 12 is sheared when the load exceeds a predetermined value.
Therefore, no load is transmitted to the lock nut 15 and wheel bearing 14 side. Therefore, rattling or seizure of the wheel bearing 14 will not occur.

Also, the second brake member 10 is attached to the spindle 13.
Since there is no need to directly fix the spindle 13
Since there is no need to extend the length of the spindle 13 to the second brake member 10, there is no need to change the length of the spindle 13, and the present invention can be easily applied to conventional systems.

[Effect of idea]

As explained above, the hub clutch of the present invention includes a cam mechanism that engages with a slide gear on a drive shaft and rotates together with the drive shaft, and a cam mechanism that is braked by a brake member when the drive shaft is driven. a retainer that generates a thrust force in the axial direction; the hub that engages or disengages the clutch.
In the clutch, the brake member is prevented from rotating by a first brake member that brakes the retainer when the brake is applied, and a keyway of a stationary spindle, and is engaged with a wheel bearing nut to prevent axial movement. Since the hub clutch is made up of a second brake member that brakes the first brake member and is connected to a limited lock washer via an engagement member, the nut can be easily tightened when an overload is applied to the brake member. This prevents rattling and seizure of wheel bearings due to looseness or excessive tightening.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of the hub clutch according to the present invention, in which a is a view showing the clutch-off state, b is a partial cross-sectional view of the lock washer, and FIG.
The figures are explanatory diagrams of the configuration of a conventional hub clutch, with a diagram showing a state in which the clutch is off and a diagram b showing a state in which the clutch is on. Explanation of symbols: 1,101... Drive shaft, 2,102... Drive gear, 3,103...
...Slide gear, 4,104...Housing,
5,119……wheel hub, 6,120……
Bolt, 7,105...cam, 8,125...retainer, 9...first brake member, 10...second
Brake member, 11... Lock washer, 12
...Engagement member, 13...Spindle, 14, 12
6...Wheel bearing, 15...Natsuto,
16...Elastic member, 17, 114...First coil spring, 18,115...Second coil spring, 121
...Fixed nut, 122...Bolt, 123...
...Lock Washer, 124...Brake, 12
6...Coil spring.

Claims (1)

[Claims for Utility Model Registration] A cam mechanism that is slidable in the axial direction of the drive shaft and that engages with a slide gear externally fitted integrally in the rotational direction to rotate together with the drive shaft; and a retainer that is braked by a brake member to generate an axial thrust force on the cam mechanism, and is fixed to the slide gear and the wheel hub by axial movement of the slide gear based on the thrust force. In a hub clutch that is engaged with a gear portion provided on the inner circumference of the housing or released from the clutch engagement, the brake member includes a first brake member that brakes the retainer when the brake is applied, and a fixed spindle. A second brake member for braking the first brake member, which is connected via an engagement member to a lock washer which is prevented from rotating in the keyway of the wheel bearing nut and whose axial movement is restricted by engaging with a wheel bearing nut. A hub clutch that is characterized by