JPH0338510Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to an auto-locking hub for automobiles.

(Prior art) With conventional auto-locking hubs, the brake outer race and the auxiliary brake slide during high-speed 4-wheel locking and high-speed 2-wheel locking, resulting in a decrease in the wear resistance, heat resistance, and strength of the auxiliary brake. was becoming a problem. Incidentally, prior documents include Japanese Utility Model Application No. 58-45132 and Japanese Patent Application No. 60-064576 filed by the present applicant.

(Problems to be solved by the invention) This invention aims to provide an auto-locking hub for automobiles that does not cause drag torque between the brake outer race and the auxiliary brake during high-speed four-wheel lock driving and high-speed two-wheel lock driving. Take it as a challenge.

(Means for solving the problem) In order to solve the above problem, this invention has an inner cam attached to the inner hub, an outer cam attached to this inner cam via a ball, and an auxiliary cam attached to the outer cam and the ball. A brake and a brake outer race are attached to each other, and a one-way clutch is formed by the inner cam, ball, outer cam, and brake outer race, and the one-way clutch is activated by the torque generated in the auxiliary brake by sliding between the brake outer race and the auxiliary brake. An automotive autorotator in which the follower moves outward and engages with the clutch due to relative rotation between the one-way clutch and the follower, which is movably attached to the inner hub in the axial direction via the cam surface of the inner cam. In the king hub, the sliding surface between the brake outer race and the auxiliary brake is a conical surface that tapers outward from the inner hub, and the inner end of the brake outer race is prevented from moving in the axial direction of the inner hub via an elastic member. It has a configuration in which the outer end is supported by a follower via an elastic member.

(Operation of the invention) In the above configuration, when the vehicle is switched between running on two wheels and running on four wheels, the brake outer race and the auxiliary brake slide relative to each other, and the one-way clutch configured as a lock ball is activated by the resistance. The inner cam, ball, outer cam and brake outer race are integrally fixed. Thereafter, the follower integrally engaged with the splines of the front axle shaft is pushed outward through the cam surface of the inner cam to engage the clutch. At this time, the outward movement of the follower weakens the spring force of the elastic member between the follower and the brake outer race, and the brake outer race is pushed outward by the spring force of the elastic member on the inner end side. Since the sliding surfaces of the brake outer race and the auxiliary brake are conical surfaces, the brake outer race is separated from the auxiliary brake. As a result, no drag torque is generated in the auxiliary brake.

(Description of Embodiments) This invention will be explained below with reference to drawings showing embodiments. The auto-locking hub 30 of this invention is the fourth
It is attached to the front wheel 31 side of the four-wheel drive vehicle shown in the figure. 32 is the rear wheel, 33 is the engine, 34 is the transmission, 35 is the transfer, 36 is the 2
Using the wheel and four-wheel switching levers, the H2 range switches to rear-wheel drive, and the H4 or L4 range switches to four-wheel drive.

FIG. 1 shows a longitudinal sectional front view of the auto-locking hub 30, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1 and 2, an inner hub 10 is spline-fitted to the front axle shaft 15, and the outer end (the right end in FIG. 1) of the inner hub 10 is connected to the cap 2 via a ball bearing 11.
1 is supported. The follower 6 is attached to the inner hub 10 in the axial direction of the inner hub 10 (internal and external directions,
They are spline-fitted so that they can move in the horizontal direction (in the figure). The follower 6 is prevented from moving inward by an inner cam 5 fixed to the inner end of the inner hub 10, and a snap ring 18 is provided between the outer end of the follower 6 and the outer end of the inner hub 10. A return spring 9 is arranged.
A clutch 7 is spline-fitted into the inner surface of the hub body 14, and is positioned by a snap spring 19 on the inner end side and a preset spring 8 on the outer end side. Preset spring 8 is cap 2
1 is supported. The follower 6 engages the clutch 7 by its outward movement. The outer circumferential surface of the inner cam 5 is 14 mm in diameter as shown in Figure 2.
14 balls 4 are arranged in a square shape, and this ball 4
is fitted into the ring groove 1b of the brake outer race 1, and is positioned by the outer cam 3 in the circumferential direction. An inner cam 5, a ball 4, an outer cam 3 and a brake outer race 1 form one one-way clutch. The brake outer race 1 is attached to a lock plate 16, and the lock plate 16 is fixed to a spindle 20 by a lock nut 22 and a lock bolt 23. ball 4
The inner peripheral surface of the brake outer race 1 is a conical surface 1a that tapers toward the outer end of the axle shaft 15. Reference numeral 2 denotes an auxiliary brake, which has brake shoes 2b, 2b at positions facing a C-shaped spring 2a, as shown in FIG. It has a conical surface 2c that can be slid on. Each brake shoe 2b has a spring 2a
It has two protrusions 2d that penetrate and protrude inwardly, and the protrusions 2d engage with the outer cam 3, thereby positioning the auxiliary brake 2.

Outer end of brake outer race 1 and follower 6
A set spring 17b is inserted between the inner end of the set spring 17b. 24 is a thrust bearing.
Also, a stepped portion 1c provided in the brake outer race 1
A set spring 17a is also inserted between the lock plate 16 and the lock plate 16.

In the above configuration, when the vehicle is running on two wheels, the clutch 7, bush 13, hub body 14, preset spring 8, and cap 21 are rotating, but the front axle shaft 15, inner cam 5, follower 6, and auxiliary brake 2 are rotating. , the inner hub 10, and the return spring 9 are not rotating. In FIG. 4, when the lever 36 is set to the H4 or L4 range and the two-wheel drive is switched to the four-wheel drive, the front axle shaft 15, inner hub 10,
The return spring 9 and follower 6 start rotating. Then, the outer cam 3 that is engaged with the follower 6 starts rotating, but since the inner end of the outer cam 3 is engaged with the auxiliary brake 2, the auxiliary brake 2
is dragged and begins to rotate. At this time, the ball 4 engaged with the outer cam 3 is sandwiched between the inner cam 5 and the brake outer race 1 and fixed integrally. Since the brake outer race 1 is assembled to the spindle 20 by a lock nut 16, it does not rotate when running on two wheels or when running on four wheels. Therefore, when the vehicle is running on four wheels, the conical surface 2c of the auxiliary brake 2 slides against the conical surface 1a of the brake outer race 1, and torque is generated in the auxiliary brake 2. This torque is transmitted to the inner cam 5 via the protrusion 2d of the auxiliary brake 2, the outer cam 3, and the ball 4. The inner cam 5 is dragged by the transmitted torque, causing a rotation difference with the follower 6, and fixes the ball 4 and the brake outer race 1 with a delay. The thrust generated on the cam surface of the inner cam 5 between the fixed one-way clutch side consisting of the inner cam 5, balls 4, outer cam 3 and brake outer race 1 and the rotating follower 6 side causes the follower 6 to move. Push outward to engage clutch 7. As a result, the front wheels (not shown) are driven by the front axle shaft 15. On the other hand, as the follower 6 moves outward, the elasticity of the set spring 17b decreases, so the brake outer race 1 is pushed by the set spring 17a and moves outward. As a result, there is no contact between the conical surface 1a of the brake outer race 1 and the conical surface 2c of the auxiliary brake 2, and the torque disappears.

(Effect of the invention) Since this invention has the above-mentioned configuration, when switching from two-wheel drive to four-wheel drive in a four-wheel drive vehicle, the spring force of the elastic member between the follower and the brake outer race is reduced by the outward movement of the follower. As the brake outer race becomes weaker and is pushed outward by the inner end side elastic member and moves away from the auxiliary brake, no drag torque is generated on the auxiliary brake.
As a result, the wear resistance, heat resistance and strength of the auxiliary brake are significantly improved.

[Brief explanation of the drawing]

FIG. 1 shows a longitudinal sectional front view of an embodiment of this invention. FIG. 2 shows a sectional view taken along the line A--A in FIG. 1. FIG. 3 shows a sectional view of the auxiliary brake. Figure 4 is 4
FIG. 2 is a schematic diagram of power transmission in a wheel drive vehicle. 1... Brake outer race, 2... Auxiliary brake, 3... Outer cam 4, 4... Ball,
5... Inner cam, 6... Follower, 7... Clutch, 10... Inner hub, 14... Hub body, 16... Lock plate, 17a, 17b
...Set spring (elastic member).

Claims (1)

[Scope of utility model registration request] An inner cam is attached to the inner hub,
An outer cam is attached to the inner cam via a ball, an auxiliary brake and a brake outer race are attached to the outer cam and the ball, respectively, and a one-way clutch is formed by the inner cam, ball, outer cam, and brake outer race. The one-way clutch rotates due to the torque generated in the auxiliary brake due to sliding between the brake outer race and the auxiliary brake, and the follower, which is movably attached to the inner hub in the axial direction via the one-way clutch and the cam surface of the inner cam, An auto-locking hub for automobiles in which the follower moves outward and engages with the clutch due to the relative rotation of An autolocking system for an automobile, characterized in that the inner end of the brake outer race is supported by a member that does not move in the axial direction of the inner hub via an elastic member, and the outer end is supported by a follower via an elastic member. hub.