JPH09250583A - Cooling device for dry type drum brake in industrial vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of friction heat between the inner circumference of a brake drum and a brake shoe, and also prevent the temperature from rising to a great extent. SOLUTION: This dry type drum brake is provided with a brake drum 2 which is rotated together with a wheel 1, a back plate 4 which stands still against the wheel 1, includes a few gap against the outer circumference of the brake drum 2, and thereby forms a hollow space 3 interspaced from the brake drum 2, and concurrently with a brake shoe 5 which is fixed onto the back plate 4, and is disposed in the hollow space 3 formed out of the brake drum 2, and of the back plate 4, and the brake is thereby applied by pressing the brake shoe 5 against the inner circumference of the brake drum 2. In this case, an air jet 29 is provided for the back plate 4, which blows air off against the hollow space 3 formed out of the aforesaid brake drum 2 and the back plate 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry drum brake used in an industrial vehicle such as a forklift truck, in which air is blown toward a hollow portion formed by a brake drum and a back plate. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, as a dry drum brake, as shown in FIG. 1, a brake drum 2 which rotates with a wheel 1 is provided, which is stationary with respect to the wheel 1 and has a slight gap with respect to the outer periphery of the brake drum 2. The back plate 4 is provided which has a hollow portion 3 extending over the brake drum 2 and which is fixed to the back plate 4 and formed by the brake drum 2 and the back plate 4. With the brake shoes 5 to be placed,
It has been known that the brake shoe 5 is braked by pressing it on the inner circumference of the brake drum 2.

[0003]

In such a dry drum brake, frictional heat is generated between the inner circumference of the brake drum 2 and the brake shoe 5, and the temperature there is likely to rise significantly. Therefore, conventionally, a plurality of fins 6 are formed on the outer circumference of the brake drum 2 to improve heat dissipation. However, even if a plurality of fins 6 are formed to improve heat dissipation, it is possible to suppress the temperature rise due to frictional heat between the brake drum 2 and the brake shoe 5 to some extent, but it is difficult to suppress the temperature rise drastically. There is still a problem that the temperature rises, and a new problem that dust adheres to the fins 6 may occur. The present invention aims to solve these problems,
That is the subject.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention comprises a brake drum which rotates together with a wheel, has a gap with respect to the outer periphery of the brake drum, and is stationary with respect to the wheel. The brake shoe includes a back plate that forms a hollow portion over the brake drum, and a brake shoe that is fixed to the back plate and that is arranged in the hollow portion formed by the brake drum and the back plate. In a dry drum brake that is braked by being pressed against the inner circumference of the brake drum, an air jet that blows air toward a hollow portion formed by the brake drum and the back plate is provided in the back plate.

[0005]

Even if frictional heat is generated between the brake drum and the brake shoe, the temperature rise due to frictional heat can be greatly suppressed by blowing air with an air jet to cool it.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a cooling device for a dry drum brake in an industrial vehicle according to the present invention will be described. As a dry drum brake, FIG. 2, FIG. 3, FIG.
As shown in FIG. 3, a brake drum 2 fixed to the hub of the wheel 1 and rotating together with the wheel 1 is provided, and the brake drum 2 has a disc portion 10 having an opening at the center through which an axle or the like penetrates, and the disc portion. An outer edge portion 11 formed on the outer edge of 10 to have a short cylindrical shape
Form into a dish shape from.

A back plate 4 fixed to the axle housing and stationary with respect to the wheel 1 is provided. The back plate 4 has a disk shape with an opening through which an axle or the like penetrates formed in the center, and its outer edge is The brake drum 2
Is formed in a ring shape with a U-shaped cross section so as to wrap around the tip of the outer edge portion of the brake drum 2. There is a slight gap 12 between this outer edge and the tip of the outer edge portion 11 of the brake drum 2. . Then, a hollow portion 3 is formed so as to extend between the brake drum 2 and the back plate 4 thus configured.

In the hollow portion 3 formed over the brake drum 2 and the back plate 4, 2
The brake shoe 5 is provided in the form of a plate that is curved along the inner circumference of the outer edge portion 11 of the brake drum 2, and the brake running 13 is fixed to the outer surface thereof. The two brake shoes 5 are arranged so as to face the inner circumference of the outer edge portion 11 of the brake drum 2, and one end of each brake shoe 5 is attached to the anchor pin 14.
The wheel cylinder 15 is mounted over the two brake shoes 5 while being attached to the back plate 4 by.

As a result, when the wheel cylinder 15 is operated, the two brake shoes 5 move in the opening direction, and the brake running 13 of the brake shoes 5 presses the inner circumference of the outer edge portion 11 of the brake drum 2 to cause the brake drum. 2 and brake shoe 5 brake running 1
Friction with 3 will cause braking.

In the dry drum brake having such a structure, as shown in FIG.
For example, an air compressor 21 is installed, and the air compressor 21 is attached to the engine 22 by the air cleaner 2
A suction hose 25 branched from an air hose 24 for supplying air via 3 is connected so that the air is sucked from here and the air is forcibly blown out from here.

On the other hand, a blowing hose 26 is connected to the air compressor 21, the blowing hose 26 is connected to an air separation box 27, and the air separation box 27 separates air from dust and water drops. Have. Two air hoses 28 are connected to the air separation box 27 so as to face the left and right wheels 1, respectively.

The respective air hoses 28 are directed toward the left and right wheels 1 and are connected to the air jets 29 attached to the back plate 4 as shown in FIG. 4, and the air jets 29 are branched. Each of the nozzles 30 is provided at the tip thereof, and one nozzle 30 has an opening 31 formed slightly inside the portion of the back plate 4 where the brake shoe 5 is arranged.
The air is blown toward the hollow portion 3 formed by the brake drum 2 and the back plate 4 by inserting the air into the hollow portion 3.

The other nozzle 30 is L-shaped,
By directing it toward the outer circumference of the outer edge portion 11 of the brake drum 2 and the outer edge of the back plate 4, air is blown here.

By doing so, the air supplied from the air compressor 21 flows into the hollow portion 3 formed by the brake drum 2 and the back plate 4 from one nozzle 30 of the air jet 29, In the hollow portion 3, it flows toward the outer peripheral side thereof and the tip of the outer edge portion 11 of the brake drum 2 and the back plate 4
It flows out from the gap 12 with the outer edge of the.

The air supplied from the air compressor 21 is supplied to the other nozzle 3 of the air jet 29.
From zero, the outer periphery of the outer edge portion 11 of the brake drum 2 and the outer edge of the back plate 4 are also sprayed.

As a result, even if friction heat is generated between the inner periphery of the outer edge portion 11 of the brake drum 2 and the brake running 13 of the brake shoe 5 during braking, as described above, the nozzle 30 of the air jet 29 causes the frictional heat. By blowing air from the inside and the outside to cool the air, the temperature rise due to frictional heat between the brake drum 2 and the brake shoes 5 and the brake running 13 can be greatly suppressed. Therefore, the brake drum 2 and the brake shoe 5, especially the brake running 1
The life of 3 can be greatly extended.

Even if abrasion powder such as the brake running 13 of the brake shoe 5 is generated, a hollow portion formed by the brake drum 2 and the back plate 4 by the air blown from the nozzle 30 of the air jet 29. 3 through the gap 12 between the tip of the outer edge portion 11 of the brake drum 2 and the outer edge of the back plate 4 to be discharged together with air to the outside, so that abrasion powder can be prevented from adhering to the inside.

Further, air is blown from the nozzle 30 of the air jet 29 onto the outer periphery of the outer edge of the brake drum 2 and the outer edge of the back plate 4, so that concrete is applied to the outer periphery of the brake drum 2 and the back plate 4. It is possible to prevent dust such as powder from adhering to the inside and also to prevent dust from entering the inside.

Although the air compressor 21 is newly installed in the above-mentioned embodiment,
This may be used in a device having an air compressor or the like in advance.

Although the air jet 29 is attached to the back plate 4 at one place, a plurality of air jets 29 may be attached in the circumferential direction.

[0021]

[Effects of the Invention] Even if frictional heat is generated between the brake drum and the brake shoe, the temperature rise due to the frictional heat can be greatly suppressed by blowing air with an air jet to cool the brake shoe. The life of the drum and the brake shoe can be greatly extended. Further, even if abrasion powder of the brake shoe is generated, it can be easily discharged to the outside from the hollow portion formed by the brake drum and the back plate through the gap between the outer periphery of the brake drum and the back plate. Therefore, it is possible to eliminate the adhesion of abrasion powder to the inside. Furthermore, by spraying air from the air jets on the outer circumferences of the brake drum and the back plate, it is possible to prevent dust such as concrete powder from adhering and to prevent dust from entering the inside.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional dry drum brake.

FIG. 2 is a schematic front sectional view of a dry drum brake in an industrial vehicle.

FIG. 3 is a schematic side sectional view of a dry drum brake in an industrial vehicle.

FIG. 4 is an explanatory view of a cooling device for a dry drum brake according to the present invention.

FIG. 5 is a schematic explanatory view of an industrial vehicle equipped with a dry drum brake cooling device according to the present invention.

[Explanation of symbols]

1 ... Wheel, 2 ... Brake drum, 3 ... Hollow part, 4 ... Back plate, 5 ... Brake shoe, 6 ... Fin, 10 ...
Disc part, 11 ... Outer edge part, 12 ... Gap, 13 ... Brake running, 14 ... Anchor pin, 15 ... Wheel cylinder, 20 ... Car body, 21 ... Air compressor, 22
... engine, 23 ... air cleaner, 24 ... air hose, 25 ... suction hose, 26 ... blowing hose,
27 ... Air separation box, 28 ... Air hose, 29
... air jet, 30 ... nozzle, 31 ... opening.

Claims (2)

[Claims] 1. A brake drum 2 rotating with a wheel 1.
And a back plate 4 which is stationary with respect to the wheel 1 and has a slight gap with respect to the outer circumference of the brake drum 2 and forms a hollow portion 3 across the brake drum 2. 4 is provided with a brake shoe 5 arranged in a hollow portion 3 formed by the brake drum 2 and the back plate 4, and the brake shoe 5 is pressed against the inner periphery of the brake drum 2 to perform a dry type In the drum brake, an air jet 29 for blowing air toward the hollow portion 3 formed by the brake drum 2 and the back plate 4 is provided on the back plate 4, and a cooling device for a dry drum brake in an industrial vehicle. . 2. A cooling device for a dry drum brake in an industrial vehicle according to claim 1, further comprising an air jet 29 for blowing air toward outer circumferences of the brake drum 2 and the back plate 4.