JPH0212130Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a braking device for a wheeled vehicle, and more particularly to a closed type wet braking device.

A closed type wet braking system is used as a braking system for wheeled vehicles in order to improve reliability.

This braking device is installed near the wheel or between the wheel and the axle.

However, in the former mounting position, it is necessary to remove the wheels for attaching and detaching the braking device, as well as the sealing member and protective member of the wet braking device, which is a cumbersome task.

Furthermore, in the latter case, it is necessary to remove the axle from the vehicle when attaching or detaching the braking device, which is a cumbersome task.

The present invention was developed in view of the above circumstances, and its purpose is to provide a braking device for a wheeled vehicle that allows the braking device to be easily attached and detached.

Hereinafter, the present invention will be explained with reference to the drawings.

Fig. 1 is an explanatory diagram of the power transmission system of a wheeled vehicle, in which the output of the engine 1 is transmitted to the front wheels 6F, the rear wheels via the transmission 2, the transfer shaft 3, a pair of front and rear drive shafts 4F, 4R, and the front and rear axles 5F, 5R. The power is transmitted to the wheels 6R, and the transfer gear 3 is equipped with a braking device A.

That is, the output gear 7 of the transmission 2 meshes with the first gear 9 provided on the intermediate shaft 8 of the transfer gear 3, and the intermediate shaft 8 is connected to the output shaft 12 via the second and third gears 10 and 11. A pair of front and rear drive shafts 4F and 4R are connected to the front and rear of the output shaft 12, respectively, and a braking device A is provided on the intermediate shaft 8.

FIG. 2 is a detailed sectional view of the braking device A, showing the transfer 3 integrated with the case 2a of the transmission 2.
A hole 13 concentric with the intermediate shaft 8 is bored in the case 3a, and the annular protrusion 14a of the pressure receiving plate 14 is fitted into the hole 13, and the intermediate shaft 8 is inserted into the hole 15 of the pressure receiving plate 14. An end portion 8a, which is rotatably supported via a spline and has a spline cut therein, projects outward.

The pressure receiving plate 14 is a cylindrical brake housing 1
A spline portion 19 is integrally formed on the inner circumferential surface of the brake housing 17 on the pressure receiving plate 14 side, and a spline portion 20 facing the spline portion 19 is fixed to the case 3a with a bolt 18.
A support body 21 having a support body 21 is spline-fitted and fixed to the spline portion 8a of the intermediate shaft 8, and friction plates 22 are spline-fitted to the spline portion 20 and the spline portion 19 alternately.

The brake housing 17 is formed with a large diameter cylinder hole 23 and a small diameter cylinder hole 24 connected to each other via a stepped portion 25.
The large diameter portion 27 and small diameter portion 28 of the brake piston 26 are respectively fitted into the step portion 25 and the step portion 29 of the brake piston 26 to form an annular pressure receiving chamber 30. 26 is pushed and held by a disc spring 31 to the left in the drawing, that is, in a direction that separates the friction plate 22 from the pressure receiving plate 14.

The pressure receiving plate 30 is connected through an oil hole 32 and a hose 33 to a master cylinder (not shown) operated by a brake pedal.

A brake actuation link 35 abuts against a protrusion 34 integrally formed on the outside of the brake piston 26, and the brake actuation link 35 is connected to a parking brake operating lever (not shown) or the like via a linkage mechanism.

An oil hole 40 is bored in the case 3a, and the oil hole 40 is connected to the support body 21 from the oil hole 41 of the pressure receiving plate 14.
The pressure receiving plate 14 is provided with an oil hole 43 opened in the hole 13 of the case 3a to supply lubricating oil to the friction plate 22. Add lubricating oil to case 3a.
The wet braking device is configured to be recovered within the wet braking system.

Therefore, when the braking device A is to be removed, the bolts 18 are loosened and the pressure receiving plate 14 and the brake piston 26 are removed as one body from the case 3a.

As a result, the friction plate 22 (brake plate,
Since the brake disc) is exposed, the friction plate 22
can be easily removed, making it easy to remove the braking device.

In addition, when installing, it is sufficient to do the opposite of the above.

In addition, since the intermediate shaft 8 of the transfer 3 is braked and fixed, the front and rear wheels 6F and 6R can be simultaneously braked, and since the braking device is installed at a position above the vehicle (above the position of conventional devices), large external forces can be avoided. Since the influence of dirt, sand, etc. is reduced, there is no need to install a complicated sealing member.

In addition, since a smaller torque acts on the intermediate shaft 8 of the transfer shaft 8 than on the drive shaft, the braking capacity is smaller than that of the drive shaft, making it possible to reduce the brake torque, make it more compact, and improve the durability of the friction plate. You can improve.

In addition, since the brake piston 26, which is slid by the hydraulic pressure in the pressure receiving chamber 30, is pushed by the brake actuation link 35, when parking on a slope etc., operating the brake pedal causes the pressure to flow into the pressure receiving chamber 30. After the brake piston 26 is slid by supplying the parking brake, the parking brake operating lever is operated to set the brake actuation link 35 to the position where the brake piston 26 is pushed, thereby ensuring parking braking. It can prevent the vehicle from going down the slope.

The braking system applies the brakes during normal driving by sending hydraulic pressure from a hose 33 through an oil hole 32 to a pressure receiving chamber 30 through a brake pedal and a master cylinder (not shown) to force the brake piston 26 against a disc spring 31. The brake is applied by sliding the friction plate 22 to the right to press the pressure plate 14 and stopping the rotation of the support body 21, that is, the rotation of the intermediate shaft 8.

When parking, the brake piston 26 is pushed by the brake actuation link 35 to press the friction plate 22 against the pressure receiving plate 14 in the same manner as described above to stop the rotation of the intermediate shaft 8, thereby acting as a parking brake.

The present invention is as described above, and the brake piston 26 is pushed and moved against the disc spring 31 by supplying pressure oil to the pressure receiving chamber 30, and the brake piston 26 is moved against the disc spring 31 using the brake operating link 35. Since the support body 21 can be connected to the brake housing 17 by pressing the friction plate 22 by pushing and moving, the intermediate shaft 8 can be fixed and the wheels connected to the intermediate shaft 8 can be braked.

Furthermore, by loosening the bolts 18, the brake housing 17 and the brake piston 26 can be removed from the case 3a of the transfer 3.
Since the friction plate 22 can be removed by removing 6, the braking device can be easily attached and detached.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is an explanatory diagram of a power transmission system of a wheeled vehicle, and FIG. 2 is a sectional view of a main part. 3 is a transfer, 3a is a case, 8 is an intermediate shaft, 14 is a pressure receiving plate, 17 is a brake housing,
22 is a friction plate, 26 is a brake piston, and 30 is a pressure receiving chamber.

Claims (1)

[Claims for Utility Model Registration] A hole 13 is bored in the case 3a of the transfer 3, and a hole 15 is formed on the outer surface around the hole 13 of the case 3a.
A pressure receiving plate 14 having a
A step-shaped cylindrical brake housing 17 having a spline portion 19, a large-diameter cylinder hole 23, and a small-diameter cylinder hole 24 on the inner peripheral surface is disposed, and the brake housing 17 and the pressure receiving plate 14 are connected by bolts 18. The intermediate shaft 8 having a spline portion 8a at its end is rotatably supported in the hole 15 of the pressure receiving plate 14, and the spline portion 8a has a spline portion 20 on its outer peripheral surface.
Friction plates 22 are alternately spline-fitted between the spline portion 20 and the spline portion 19 of the brake housing 17, and the large-diameter cylinder hole 23 of the brake housing 17 and A brake piston 26 having a large diameter portion 27 and a small diameter portion 28 is fitted into the small diameter cylinder hole 24 with its tip facing the friction plate 22 to form a pressure receiving chamber 30, and a disc spring 31 serves as a brake piston. A braking device for a wheeled vehicle, in which a piston 26 is biased and held in a direction away from the friction plate 22, and a brake actuation link 35 is brought into contact with the base end of the brake piston 26.