JPS6237784Y2 - - Google Patents

Description

[Detailed description of the invention] [1] Technical field The present invention uses a clutch to connect the engagement portion between the drive gear and the brake member in order to improve the durability and reliability of the brake member that slides elastically with the fixed system. The present invention relates to a hub clutch having a taper that reduces sliding friction of a brake member.

[2] Background Art As a hub clutch previously proposed by the present applicant, there is one shown in FIGS. 1A and 1B, for example, which has a spline connection with the drive shaft 1 at the inner periphery, and a gear part and a brake release part on the outer periphery. a drive gear 2 having a pawl 2a for use, a slide gear 3 that is spline-coupled between an outer gear portion and an inner circumferential portion of the drive gear 2, has a gear portion on the outer circumferential portion, and is movable in the axial direction;
A housing 4 has a gear part that engages with the slide gear 3 on its inner periphery, and its outer periphery is fixed to the wheel hub 19 via bolts 20, and the housing 4 is spline-coupled with the slide gear 3 and has a gear part that engages with the slide gear 3 in the axial direction of the slide gear 3. a cam 5 that is movable over a predetermined distance; and a retainer 6 that is rotatably disposed outside the drive gear 2 and has a V-shaped concave cam portion 6a that engages with the cam 5.
and a protrusion 7 that engages with the pawl 2a of the drive gear 2.
a and a cam portion 7b that engages with the V-shaped protrusion-shaped cam portion 6b of the retainer 6, and a claw portion 2a that engages with the protrusion portion 7a when the engagement between the cam 5 and the retainer 6 is released. a first brake member 7 that is directly driven by the drive gear 2 through the drive gear 2 and has a conical friction outer circumferential surface and is movable in the axial direction; and a conical inner circumference that engages with the first brake member 7. a second brake member 8 that is engaged with the keyway 16a of the fixed spindle 16 and is movable in the axial direction; a circlip 9 that prevents the second brake member 8 from falling off; and a spindle 1.
a nut 11 disposed radially outwardly of the wheel bearing 18, a lock washer 12 and a circlip 13 that stop the rotation of the nut 11, and a relatively small spring force that connects the nut 11 and the second wheel bearing 18; An elastic member 10 is disposed between the brake member 8 and the elastic member 10, and the elastic member 10 has a predetermined spring force and is disposed coaxially on the outside in the radial direction of the slide gear 3, with one end seated on the retainer 6 and the other end a spring holder. a first coil spring 14 that is seated on the cam 5 via a coil spring 17 and presses the cam 5 to the left in the axial direction; The second coil spring 15 presses the slide gear 3 to the right in the axial direction.

In the above configuration, Fig. 1A, Fig. 2A,
When you want to switch from the two-wheel drive (hereinafter referred to as "2WD") shown in Figure 1B and to the four-wheel drive (hereinafter referred to as "4WD") shown in Figures 1B and 3A and 3B, install the 2WD by operating the shift lever
When switching from 4WD to 4WD, driveshaft 1
begins to rotate, the drive gear 2 spline-coupled to the drive shaft 1 rotates, and the slide gear 3 spline-coupled to the drive gear 2 also rotates together with the cam 5. Here, the cam 5 has a protrusion and the cam portion 6 of the retainer 6
a, a rotational force acts on the retainer 6, and this rotational force causes the V-shaped protrusion-shaped cam portion 6b on the left side in the axial direction of the retainer 6 to engage with the first cam portion 6b.
A rotational force is also applied to the first brake member via the V-shaped concave cam portion 7b of the brake member 7. However, since the first brake member 7 is in light contact with the conical surface of the second brake member 8, which is fixed so as not to rotate by the groove 16a of the spindle 16, the first brake member 7 is rotated due to the wedge action of the cam portions 6b and 7b. The brake member 7 is pressed to the left in the axial direction, pressing the second brake member 8 against the nut 11, and its braking force increases. This increase in braking force further increases the wedge action (thrust force), providing a predetermined braking force and preventing the first and second brake members 7, 8 from slipping. Therefore, the second
Then, the first brake members 8, 7 and further the retainer 6 are braked and rotation is suppressed. Therefore, relative rotation occurs between the cam 5 and the retainer 6, generating an axial thrust force, and the cam 5
moves to the right in the axial direction to the positions shown in FIG. 1B and FIG. 3B while compressing the first coil spring 14,
Along with this, the slide gear 3 moves to the right in the axial direction via the second coil spring 15, and the housing 4 moves to the right in the axial direction.
The drive shaft 1 and the housing 4 are thereby connected to each other to provide 4WD. At this time, as shown in FIG. 3B, the protrusion of the cam 5 protrudes from the cam portion 6a of the retainer 6 to the right in the axial direction, so the force for rotating the retainer 6 disappears.
Therefore, the force pressing the first and second brake members 7, 8 against the nut 11 also disappears. Then, the drive shaft 1 and the first brake member 7 rotate relative to each other, and the pawl 2a of the drive gear 2 engages with the protrusion 7a of the first brake member 7 (see FIG. 3A). 7 is driveshaft 1
It is directly driven via the claw 2a and the cam portion 7a.

Also, when you want to change from 4WD to 2WD, switch the shift lever from 4WD to 2WD and move the car slightly in the opposite direction to the direction in which it has been traveling. Since the pawl 2a is separated and the input to the first brake member 7 is only from the V-shaped concave cam portion 7b as described above, the first and second brake members 7 and 8 are fixed to the nut 11. As the vehicle moves, the hub 19 rotates, and the housing 4 rotates the slide gear 3 and drive shaft 1. However, since the retainer 6 is fixed by the first and second brake members 7 and 8, the retainer 6 and the cam 5 rotate relative to each other, and the V-shaped protrusion of the cam 5 falls into the cam portion 6a of the retainer 6 due to the action of the first coil spring 14.
Therefore, the slide gear 3 moves leftward to the positions shown in FIG. 1A and FIG. 2B. the result,
The connection between the housing 4 and the drive shaft 1 is released, the rotation of the drive shaft 1 is stopped, and the 2WD is activated.
is obtained.

However, with conventional hub clutches,
In the 4WD state, relative rotation occurs between the first and second brake members 7 and 8 due to the drive of the drive shaft 1, which are in light contact with each other due to the elastic member 10, so that the contact surface is caused by sliding friction between the two. There is a risk that the brake members 7 and 8 will be worn out and the durability and reliability of the brake members 7 and 8 will be reduced.

[3] Purpose and structure of the invention This invention was made in view of the above,
In order to reduce wear on the contact surfaces of the brake components during 4WD and improve the durability and reliability of the brake components, a fixed system is installed on the brake components that have an engaging part that is driven by the drive gear when the clutch is engaged. The present invention provides a hub clutch in which the engaging portion is tapered so as to apply a thrust force in a direction that reduces sliding friction with the clutch.

The hub clutch according to the present invention will be explained in detail below.

[4] Embodiment Figures 5A and 5B show an embodiment of the present invention.
The same parts as in FIGS. 4 to 4 are indicated by the same reference numerals, so a redundant explanation will be omitted, but the shape of the brake release pawl of the drive gear 2 is different from that in FIG. 4.

That is, the drive gear 2 according to this embodiment
A gear part spline-coupled to the drive shaft 1 on the inner periphery, a gear part spline-coupled to the slide gear 3 on the outer periphery, and a brake release protruding from the outer periphery of the flange provided at the left end of the gear part. It has a claw 2b for use. The shape of the pawl 2b is tapered (that is, reversely tapered) toward the outer peripheral gear portion in the axial direction at the engagement surface with the cam portion 7a of the first brake member 7.

In the above configuration, in 2WD state,
Since no relative rotation occurs between the first and second brake members 7, 8, there is no sliding movement between the two brake members 7, 8, and therefore no wear occurs between the brake members 7, 8. In addition, in the 4WD state, the pawl 2b of the drive shaft 2 and the cam portion 7a of the first clutch plate 7
When the first brake member 7 is driven by the drive shaft 1 and rotates, a relative rotation occurs between the first brake member 7 and the second brake member 8 which is in a non-rotating state. 1 Brake member 7
Since the first brake member 7 is displaced to the right by the thrust force f to the right, the first and second brake members 7 and 8 are in a non-contact or slight contact state. , 8 wear is reduced,
The durability and reliability of the brake members 7 and 8 are improved.

Note that as a means for obtaining the thrust force f, the first
A taper may be provided on the cam portion 7a side of the brake member 7. However, the first brake member 7
It is necessary to increase the thickness, strength, etc. of the cam portion 7a. Therefore, it is better to provide the pawl 2b of the drive gear 2 with a taper as in the above embodiment, which increases the strength and
It is preferable in terms of manufacturing and the like.

[5] Effects of the invention As explained above, according to the hub clutch of the invention, when the clutch is engaged, thrust force is applied to the brake member driven by the drive gear in a direction that reduces sliding friction with the fixed system. A taper is provided to reduce brake component wear.
Durability and reliability can be improved.

[Brief explanation of the drawing]

1 to 4 are explanatory diagrams of the configuration of a conventional hub/clutch, where FIG. 1A shows a two-wheel drive state (clutch off state), and FIG. Figure 2A is a cross-sectional view of Figure 1A, Figure 2B is an explanatory diagram of the clutch-off state, Figure 3A is a cross-sectional view of Figure 1B, Figure 3A is a cross-sectional view of Figure 1B, Figure B is an explanatory diagram of the clutch-on state, Figure 4A is a perspective view of the drive gear, Figure 4B is an explanatory diagram of the operation of the drive gear, and Figure 5A is a diagram of the drive gear according to an embodiment of the present invention. A perspective view, and FIG. 5B is an explanatory diagram of the operation of FIG. 5A. Explanation of symbols 1... Drive shaft, 2... Drive gear, 2b... Brake release pawl, 3... Slide gear, 4... Housing, 5... Cam, 6... Retainer, 6a, 6b... Cam part, 7... First brake member , 7a, 7b...cam part, 8...second brake member, 10...elastic member, 14...first coil spring, 1
5...Second coil spring.

Claims (1)

[Claims for Utility Model Registration] A sliding surface that comes into contact with a fixed system due to elastic force, and a thrust force generated by the driving force of a drive shaft, and a braking force that increases based on the friction of the sliding surface. A brake member has a cam portion that generates a cam, and a thrust force based on the braking force and the driving force of the drive shaft engages the clutch against the elastic member, and when the drive shaft is released, the clutch is released from the hub. The drive gear is provided with a cam mechanism that releases the clutch connection based on the elastic force of the elastic member and the contact of the sliding surface when the clutch is rotated in a direction opposite to that at the time of connection, and the brake member is spline connected to the drive shaft. an engaging cam that is driven by engaging with a brake release pawl provided at the clutch when the clutch is engaged; and when the engaging cam and the brake release pawl engage when the clutch is engaged, the elasticity of the sliding surface is reduced. A hub clutch that engages through a tapered surface that generates a thrust force in a direction that reduces friction caused by force.