JPS61223342A - Brake device - Google Patents

Abstract

PURPOSE:To simplify a structure, reduce the size thereof, and facilitate repair and inspection work for a brake device by disposing a brake disc and a disc plate between an internal gear hub and a planetary reduction gear. CONSTITUTION:An internal hub 7 comprises a hub body 7A and a ring member 7B which is a cylindrical ring member, the axial inner end portion of which is externally fitted to the hub body 7A. The brake disc 17 and the disc plate 18 of a brake device 16 are disposed between the inner end surface of a planetary arm 4 axially inside the planetary gear 11 of a reduction gear 2 and the hub body 7A. The inner peripheral portion of the brake disc 17 is spline-fitted to the spline portion 1a of an axle 1, and the outer peripheral portion of the disc plate 18 is spline-fitted to an internal gear 10.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a brake device, and particularly to an axle device that connects a tire wheel to the end of a drive axle of a vehicle via a planetary gear reducer. This invention relates to brake equipment.

(Prior Art) The brake devices B for vehicles that have been widely used in the past can be broadly classified into those shown in FIGS. 7 and 8.

Brake device B in FIG. 7 is applied to large vehicles, and is used to brake tire wheels 105 that have been decelerated by a planetary gear reducer 102 as a final deceleration device connected to the shaft end of a drive axle 101. The wheel hub 114 and the axle housing 106 are connected to each other on the outer peripheral side of the wheel hub 114.
A brake device B is provided between the two, and the brake disc 117 thereof is connected to the outer circumference of the wheel hub 114 for synchronous rotation, and a disc plate 118 for braking the brake disc 117 is connected to the axle housing 1.
It is connected to the 06 side so that it can be rotationally restrained and movable in the axial direction.

The brake device B shown in FIG. 8 is applied to a small car, and has a planetary gear reducer 102 as a final reduction device disposed on both left and right sides of a differential gear bag WD, and its sun gear 10.
A drive input shaft 10 having 3.

A brake device B is provided between O and the differential housing 99, and the brake disc 117 thereof is connected to the drive input shaft 100 for synchronous rotation, and a disc plate 11 that brakes the brake disc 117.
8 is connected to a differential housing 99 so as to be rotationally restrained and movable in the axial direction.

(Problems to be Solved by the Invention) In the brake device shown in FIG. 7 above, the tire wheel 105
Since the wheel hub 114 connected to the wheel hub 114 rotates at low speed and high torque, the braking torque also increases by 1, and a large number of brake discs 117 are required. In addition, the number of brake devices B increases, the structure becomes complicated, and the brake device B becomes larger.
7. There are problems such as the fact that the wheel hub 114, the tire wheel 105, and the brake device FB cannot be disassembled unless they are removed from the axle housing 106.

In the brake system fiB shown in FIG. 8 above, the drive axle 101 must transmit a low-rotation, high-torque driving force, and a large braking torque acts on the drive axle 101 during braking, so the drive axle 101 has a large diameter. Brake equipment WB
There are problems such as the fact that it cannot be disassembled without removing the axle housing 106, drive axle 101, and planetary gear reducer 102 during repair and inspection.

(Means for Solving the Problems) A brake device according to the present invention is a brake device installed in an axle device in which a tire wheel is connected to an end of a drive axle of a vehicle via a planetary gear reducer. A brake disc and a disc plate that brakes the brake disc are arranged between an internal gear hub that supports a wheel hub bearing, a planetary gear reducer, and a disc plate that brakes the brake disc, so that the inner circumference of the brake disc rotates in synchronization with the drive axle. At the same time, the outer circumferential portion of the disc plate is connected to the internal gear hub with rotation restraint.

(Function) In the brake device of the present invention, when the disc plate connected to the internal gear hub in a rotationally restrained manner brakes the brake disc connected to rotate synchronously with the drive axle, the drive axle is rotated. The tire wheels connected to the drive axle via the planetary gear reducer are braked.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

As shown in the longitudinal cross-sectional view of the axle device in FIG.
A tire wheel 5 is fixed to the outer periphery of the outer end surface of the planetary arm 4 of a2 with bolts.

The axle housing 6 protrudes into the center of the tire wheel 5 in the width direction, and the hub body 7A of the internal gear hub 7 is externally fitted to the end of the axle housing 6, and the spline fitting portion 8 and the nut 9 are connected to each other.
The internal gear hub 7 is fixed to the axle housing 6 by the hub body 7A and a cylindrical ring member 7B, the axially inner end portion of which is fitted onto the hub body 7A. Or something.
□An internal gear 10 is formed on the inner circumferential surface of the ring member 7B, and the internal gear 10, the planetary gear 11, and the sun gear 3 at the axially outer end of the ring member 7B form a planetary gear reducer 2 (hereinafter referred to as a reduction gear). The spline teeth 12 of the hub body 7A are fitted into the internal gear 10 at the axially inner end of the ring member 7B, and the internal gear 10 and the hub body 7A are mutually stopped. By fitting the ring 13, the hub body 7A and the ring member 7B are integrally connected. However, the hub body 7A and the ring member 7
It may be formed integrally with B.

The axially outer end of the wheel hub 14 that surrounds the outer circumferential side of the internal gear hub 7 is fixed to the part of the planetary arm 4 that is fixed to the tire wheel 5, and the axially inner end of the wheel hub 14 is a pair of bearings 15a and 15b
It is supported by the hub body 7A and the axle housing 6.

A brake disc 17 of the brake device 16 and a disc plate 18 for braking the brake disc 17 are disposed between the inner end surface of the planetary arm 4 axially inside the planetary gear 11 of the reduction gear 2 and the hub body 7A. The inner circumferential portions of the two brake discs 17 are spline-fitted to the spline portion 1a of the axle 1, and are coupled so as to be movable in the axial direction and rotate synchronously with respect to the axle 1.
The outer peripheral edge of the inner gear 10 reaches near the inner peripheral surface of the tooth tip of the internal gear 10.

The disc plate 18 is disposed on the same dirt floor as the brake disc 17 and on the inside of the brake disc 17 on the inside in the axial direction, and the outer peripheral part of the disc plate 18 is spline-fitted to the internal gear 10, and the shaft is connected to the ring member 7B. They are movable in direction and connected with rotational restraint.

Further, a ring-shaped piston 19 is attached to the outer periphery of the outer end of the hub body 7A in the axial direction, and the outer end surface of the piston 19 approaches and opposes the inner disc plate 18. Hydraulic pressure can be supplied from a master cylinder (not shown) via an oil passage 20 formed between the housing 6 and the hub body 7A.

Further, a receiving portion 21 is formed on the outer circumference of the inner end of the planetary arm 4 to receive and stop the disc plate 18 and the brake disc 17 that are pressed by the piston 19 during brake operation.

Next, the operation of the brake device 16 will be explained.

When the brake pedal of the vehicle is not operated and hydraulic pressure is not supplied to the oil passage 2o, the piston 19 is in the return state by a return mechanism (not shown) as shown in FIG. Therefore, a slight gap is created between the disc plate 18 and the brake disc 17 and between the brake disc 17 and the receiving part 21, and the brake disc 17 rotates in synchronization with the axle 1. do.

When the brake pedal of the vehicle is operated and hydraulic pressure is supplied from the master cylinder to the piston 19 via the oil passage 20, the piston 19 advances as shown in FIG.
Since the brake disc 17 and the disc plate 18 are tightly sandwiched between the brake disc 17 and the receiving part 21, the inner brake disc 17 is held between the two disc plates 1, which are stationary members.
At 8, the outer brake disk 17 is braked by the disk plate 18, which is a stationary member, and the receiving part 21, which rotates at a reduced rotation speed.

In addition, the reference numeral 17a in the figure is a friction material provided on the surface of the brake disc 17.

Here, the above embodiment may be partially modified as follows.

As shown in FIG. 4, the receiving portion 21 of the planetary arm 4 is formed as a ring-shaped receiving member 21A so that it can be replaced when damaged.
It is fixed to the planetary arm 4 with screws or the like.

As shown in FIG. 5, instead of the receiving portion 21, a ring-shaped receiving member 21B is disposed between the planetary arm 4 and the brake disc 17 or the disc plate 18.
It is fixed to B with bolts, etc.

As shown in FIG. 6, the inner peripheral portion of the brake disc 17 is spline-fitted to the sun gear 3. As shown in FIG. This increases the diameter of the fitting portion on the inner circumference of the brake disc 17, which is advantageous in terms of strength of the fitting portion.

(Effects of the Invention) As explained above, in the brake device according to the present invention, the brake disc is connected to the drive axle serving as the input shaft of the planetary gear reducer so as to rotate synchronously, and is capable of high rotation and low torque. Since the braking torque is reduced by using a disc plate to brake the brake disc, it is possible to downsize the brake device by reducing the number of brake discs without increasing the diameter of the drive axle.

Since a brake disc and a disc plate are arranged between the internal gear hub and the M star gear reducer, the brake disc can be spline-fitted to the spline of the drive axle to which the sun gear is fitted, and the internal gear hub can be spline-fitted. By spline-fitting the disc plate to the internal gear of the brake system, or by using the planetary arm as a disc plate holder, parts can be made multi-functional, reducing the number of parts in the brake system and simplifying the structure. The device can be made smaller.

Furthermore, when repairing or inspecting the brake device, it can be easily dismantled by simply removing the tire wheels and planetary gear reducer.

[Brief explanation of the drawing]

Among the drawings, FIGS. 1 to 6 show embodiments of the present invention, and FIG. 1 is a longitudinal sectional view of the axle device, and FIG.
Figures 2 and 3 are enlarged vertical cross-sectional views of essential parts when the brake is not activated and when the brake is activated, respectively. Figures 4 and 5 are views corresponding to Figure 2 of a modified embodiment. Figure 6 is a modified embodiment. The enlarged vertical sectional view of the connecting part between the sun gear and the brake disc, FIGS. 7 and 8 respectively show the prior art, and FIG.
FIG. 8 is a cross-sectional view of the main parts of the differential gear device, the planetary gear reducer, and the brake device. 1. Drive axle, 2. Planetary gear reducer, 5. Tire wheel, 7. Internal gear hub, 7A
...Hub body, 7B..Ring member, 15a..Bearing, 16..Brake device, 17..Brake disc, 18..Disc plate. Patent applicant: Kawasaki Heavy Industries, Ltd. Figure 6, Figure 7, LJzl (Jl

Claims (1)

[Claims] (1) In a brake device installed on an axle device in which a tire wheel is connected to the shaft end of a drive axle of a vehicle via a planetary gear reducer, an internal gear hub supporting a wheel hub bearing and a planetary gear reducer A brake disc and a disc plate for braking the brake disc are disposed between the brake disc and the brake disc, and the inner peripheral part of the brake disc is connected to the drive axle so as to rotate in synchronization with the drive axle,
A brake device characterized in that the outer periphery of a disc plate is connected to an internal gear hub by rotational restraint.