KR100760357B1 - Brake in wheel type industrial vehicle - Google Patents

Abstract

The present invention provides a brake device of a wheel type industrial vehicle. The brake device of the present invention includes an axle shaft 10; A plurality of disc plates 12 mounted at intervals along the outer circumferential surface of the axle shaft 10 so as to be integrally rotated with the axle shaft 10; A brake housing 20 installed at an end of the axle shaft 10 so as to surround the disc plate 12; A plurality of separation plates 14 disposed between the disc plates 12 and movably mounted to the inner circumferential surface of the brake housing 20; A braking piston 30 which moves along the inner circumferential surface of the brake housing 20 by the introduced pressure oil and presses the separation plate 14 in a direction in which the disc plate 12 and the separation plate 14 are in close contact with each other; A parking piston (40) inserted into the inner diameter portion (32) of the brake piston (30) to pressurize the brake piston (30) and rotating in response to the operation of the parking lever; A fixing plate 60 fixed to the brake housing 20 so as to support a rear surface of the parking piston 40; It characterized in that it comprises a forward means for advancing the parking piston 40 to pressurize the braking piston 30 as the parking piston 40 rotates.

Description

Brake device for wheel type industrial vehicle {BRAKE IN WHEEL TYPE INDUSTRIAL VEHICLE}

1 is an enlarged cross-sectional view showing a part of a wet multi-plate brake device of a conventional industrial vehicle;

Figure 2 is an enlarged cross-sectional view showing in detail the main part of the brake device of the industrial vehicle according to the present invention;

3 is a cross-sectional view taken along the line A-A of FIG.

4A and 4B are sectional views taken along line B-B of FIG. 3 and in operation.

♣ Explanation of symbols for the main parts of the drawing ♣

10: axle shaft 12: disc plate

14: separation plate 20: brake housing

22: first housing 24: second housing

30: braking piston 32: inner diameter

36: pressurization surface 40: parking piston

50: thrust bearing 60: fixed plate

70: first inclined groove 72: second inclined groove

74: ball

The present invention relates to a brake device of a wheel type industrial vehicle, and more particularly, a brake piston and a parking piston may be integrally formed in a brake housing, and in particular, a parking piston may be installed at an inner diameter of a brake piston. It relates to a brake device of a wheel type industrial vehicle that can reduce the installation width.

In general, various industrial vehicles used in construction sites or workshops, especially wheel type industrial vehicles having excellent mobility, are themselves heavy and load heavy cargoes, so brake devices can be provided for safety during rapid steering and braking. As a necessary brake device, there is a wet multi-plate disc brake device.

This wet multi-plate brake device includes a brake housing 2 surrounding the axle shaft 1 for driving a wheel of a vehicle by receiving rotational force from an engine through a transmission or the like, as schematically and partially shown in FIG. 1. . The axle shaft 1 is provided with a plurality of disc plates 3 at predetermined intervals, and a separation plate 4 is inserted between the disc plates 3. The separating plate 4 is fixed to the brake housing 1 with splined joints and is movable along the axial direction. In addition, the brake housing 2 is provided with a braking piston 5 called a brake piston. The piston (5) is moved by the pressure oil supplied to the oil passage (not shown) to press one side of the separation plate (4).

Referring to the operation of the wet multi-plate brake device having such a configuration, first, when the driver presses the brake pedal while driving the vehicle, the hydraulic oil is supplied between the brake housing 2 and the braking piston 5 through a predetermined path. Then, the braking piston 5 pushes the outermost plate of the outer separating plates 4. Then, when the outer separating plate 4 is pushed, each of the separating plates 4 is simultaneously pushed onto each disk plate 3 to be pressed to achieve braking by the friction force between the respective plates 3 and 4. It can be.

On the other hand, the wheel type industrial vehicle is provided with a parking brake for stopping the vehicle when parking. Such parking brakes are generally used as a center brake for braking drums installed on the propulsion shaft.

However, such a wheel type brake device for an industrial vehicle, as described above, has a disadvantage in that a parking brake for parking is separately installed on the propulsion shaft in addition to the wet multi-plate brake device installed at the end of the axle shaft.

On the other hand, a brake device in which the parking brake and the driving brake are installed at the same time has been developed, but this has the disadvantage of increasing the size of the brake device. And due to such disadvantages, in the case of small industrial vehicles with a small installation space was forced to install a separate parking brake.

Accordingly, the present invention has been made to solve the conventional problems as described above, the object is to provide a brake device of a wheel-type industrial vehicle having a compact size while having a driving brake and a parking brake integrally.

In order to achieve the above object, the present invention provides an axle shaft; A plurality of disk plates spaced along the outer circumferential surface of the axle shaft so as to be integrally rotated with the axle shaft; A brake housing installed at an end of the axle shaft to surround the disk plate; A plurality of separation plates disposed between the disk plates and movably mounted on an inner circumferential surface of the brake housing;

A braking piston which moves along the inner circumferential surface of the brake housing by the introduced pressure oil and presses the separation plate in a direction in which the disc plate and the separation plate are in close contact with each other; A parking piston inserted into the inner diameter portion of the braking piston so as to pressurize the braking piston and rotating in response to the operation of the parking lever; A fixing plate fixed to the brake housing to support a rear surface of the parking piston; And forwarding means for advancing the parking piston to pressurize the braking piston as the parking piston rotates.

Preferably, the forwarding means is formed at equal intervals on the rear surface of the parking piston, but fixed to correspond to the plurality of first inclined grooves and the first inclined grooves inclined in a direction opposite to the rotation direction of the parking piston. It is formed on the front of the plate, characterized in that consisting of a plurality of second inclined groove inclined in the rotational direction of the parking piston, and a plurality of balls disposed between the first inclined groove and the second inclined groove.                     

Hereinafter, a preferred embodiment of a brake device of a wheel type industrial vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 2, the brake device of the wheel type industrial vehicle according to the present invention has a brake housing 20 surrounding an end of the axle shaft 10. The housing 20 is composed of a first housing 22 fixed to a vehicle body and a second housing 24 fastened to the first housing 22 with bolts.

In addition, a plurality of disc plates 12 are installed at equal intervals in the axle shaft 10 in the brake housing 22. This disc plate 12 is spline-assembled so that it may rotate integrally with the axle shaft 10. In addition, the brake housing 20 is provided with a plurality of separation plates 14 disposed between the disc plates 12. Here, the separating plate 14 is configured to be capable of axial movement with respect to the inner circumferential surface of the second housing 24 and to prevent rotation. For this purpose, the semicircular groove 24a is formed on the inner circumferential surface of the second housing 24. It is formed along the direction, and the separation plate 14 is provided with the projection part 14a inserted in the semi-circular groove 24a of the 2nd housing 24, respectively. As the separating plate 14 is guided to the semi-circular groove 24a, axial movement is possible, but its rotation is limited due to the protrusion 14a coupled to the semi-circular groove 24a.

On the other hand, one side of the axle shaft 10 is connected to a differential (not shown), the other side is connected to the hub (H) is installed wheel of the vehicle transmits power to the wheel or tire.

In addition, a brake piston 30 is disposed around the axle shaft 10 in the brake housing 20, in detail, inside the first housing 22 to move with respect to the respective plates 12 and 14. It is possibly installed. The braking piston 30 moves by the hydraulic pressure supplied from the pressure oil supply port 22a formed in the first housing 22 to press the outermost separating plate 14, and has an inner diameter portion 32. In particular, the stepped portion 34 is formed in the inner diameter portion 32 such that the pressing surface 36 is formed along the inner circumferential surface. On the other hand, the outer surface of the braking piston 30 is formed stepped, the outer surface of each stage is provided with a seal 38 for preventing the leakage of the pressure oil supplied from the pressure oil supply port (22a).

In addition, the parking piston 40 is movable in the inner diameter portion 32 of the braking piston 30. The parking piston 40 is disposed around the axle shaft 10 similarly to the braking piston 30, and moves in the braking piston 30 while moving along the inner diameter portion 32 of the braking piston 30. Pressing the pressing surface 36 of the neck portion 32 serves to press the braking piston 30 toward the outermost separating plate 14. Meanwhile, a thrust bearing 50 is disposed between the pressing surface 36 of the braking piston 30 and the parking piston 40, and the thrust bearing 50 has the parking piston 40 and the pressing surface. (36) serves to prevent direct contact. The reason why the thrust bearing 50 is disposed between the pressing surface 36 and the parking piston 40 is that the braking piston 30 presses the pressing surface 36 while rotating. This is to reduce the contact resistance between the braking piston 30 and the parking piston 40. Description thereof will be described later.

On the other hand, the parking piston 40 is configured to be elastically supported in a direction away from the pressing surface 36 of the braking piston 30, for this purpose, the parking piston 40 in the brake device of the present invention the first housing Equipped with a return spring (42) to pull (22). The return spring 42 is configured such that one end is supported by the parking piston 40 and the other end is supported by the fixed plate 60 to be described later. This return spring 42 is provided with a pair of both sides of the parking piston 40, as shown in FIG.

In addition, one side of the parking piston 40 is connected to the cable rod 44 as shown in FIG. The cable rod 44 is operatively connected to the parking lever operated by the driver, and is configured to pull and rotate one side of the parking piston 40 as the driver operates the parking lever. The parking piston 40 operatively connected to the parking lever in this way can be rotated within a predetermined range according to the driver's operation.

Referring back to Figure 2, and the rear of the parking piston 40 is fixed plate 60 is installed. The fixing plate 60 is configured to be fixed to the first housing 22. For this purpose, a plurality of fixing holes 62 are formed in the fixing plate 60, and the fixing holes 62 are formed in the first housing 22. A plurality of fastening holes 22b are formed to be aligned with each other. The fastening pins 64 are fitted into the aligned fastening holes 62 and the fastening holes 22b. The fixed plate 60 serves to support the rear surface of the parking piston 40 in a state of being fixed to the first housing 22. Here, the fixed plate 60 is always kept in close contact with the parking piston 40 by the return spring 42.

On the other hand, the brake device of the present invention has a forwarding means for advancing the parking piston 40 to press the braking piston 30 as the parking piston 40 rotates. The advancing means is fixed to correspond to the plurality of first inclined grooves 70 and the first inclined grooves 70 formed at equal intervals on the rear surface of the parking piston 40 as shown in FIGS. 2 and 4A. A plurality of second inclined grooves 72 formed at equal intervals on the front surface of the plate 60, and a plurality of balls 74 disposed between the first inclined grooves 70 and the second inclined grooves 72. It consists of. In particular, the first inclined groove 70 is configured to be inclined in a direction opposite to the rotational direction of the parking piston 40, the second inclined groove 72 is configured to be inclined toward the rotational direction of the parking piston 40, As the parking piston 40 rotates, the parking piston 40 serves as a support point to separate the parking piston 40 from the fixed plate 60.

Next, the operation of the brake device of the wheel type industrial vehicle configured as described above will be described in detail by dividing the brake during driving and the braking during parking. First, as shown in FIG. 2, when a driver presses a brake pedal while driving a vehicle, pressure oil is supplied through the pressure oil supply port 22a to pressurize the brake piston 30. Then, the braking piston 30 moves toward the outermost separating plate 14 and presses it, and the outermost separating plate 14 is fixed to the axle shaft 10 to rotate each disk plate 12. ) Is in close contact with the friction contact braking is made. On the contrary, when the driver releases the brake pedal, the brake piston 30 retreats backward, and then the disc plate 12 and the separation plate 14 are spaced apart from each other to release the braking.

On the other hand, when the driver pulls the parking lever (not shown) to park the vehicle, the cable rod 44 is pulled in the direction of the arrow A1 in Fig. 3, and at the same time the parking piston 40 is also the arrow A2. Direction of rotation. At this time, the first inclined groove 70 of the parking piston 40 and the second inclined groove 72 of the fixed plate 60 are close to each other as shown in Figs. 4a and 4b, accordingly, the first inclined groove The ball 74 disposed in the 70 and the second inclined groove 72 forwards the parking piston 40 forward while rolling along the inclined surfaces of the first inclined groove 70 and the second inclined groove 72. Will be advanced.

On the other hand, as the parking piston 40 moves forward, the parking piston 40 presses the pressing surface 36 of the braking piston 30, and the parking piston 40 has a braking piston ( As the pressure 30 is applied, the brake piston 30 presses the separation plate 14 while moving toward the separation plate 14. As a result, in the same manner as when braking while driving, the separating plate 14 is in close contact with each disk plate 16 assembled to the axle shaft 10 and is in friction contact with the parking brake.

Here, the parking piston 40 rotates and pressurizes the pressing surface 36 of the braking piston 30 at this time. In this case, the parking piston 40 and the pressing surface 36 are located in FIG. Since the thrust bearing 50 is disposed as described above, no frictional resistance is generated between the parking piston 40 and the braking piston 30.

When the driver releases the parking brake lever to drive the vehicle, the cable rod 44 returns to its original position, and as the cable rod 44 returns to its original position, the rotated parking piston 40 also rotates to its original position. . Meanwhile, as the parking piston 40 is rotated to its original position, the first inclined groove 70 and the second inclined groove 72 are also rotated in opposite directions with respect to each other, as shown in FIGS. 4A and 4B. The parking piston 74 disposed in the first inclined groove 70 and the second inclined groove 72 also moves forward while rolling along the first inclined groove 70 and the second inclined groove 72. 40 will be retracted to the rear. And as the parking piston 40 is retracted to the rear, the braking piston 30 is also retracted to the rear, whereby the disc plate 12 and the separation plate 14 are spaced apart from each other to release the braking.

The present invention as described above is provided with the driving brake and the parking brake integrally to reduce the need to install the parking brake separately. In particular, by installing the parking piston so as to overlap the inner diameter portion of the braking piston, there is an advantage that can be installed at the same time the running brake and the parking brake without increasing the size of the brake device.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope of the claims.

As described above, the brake device of the wheel type industrial vehicle according to the present invention has the effect of reducing the inconvenience of separately installing the parking brake by providing the driving brake and the parking brake integrally. In addition, by installing the parking piston so as to overlap the inner diameter portion of the braking piston, there is an advantage that can be installed at the same time the running brake and the parking brake without increasing the size of the brake device.

Claims (3)

An axle shaft 10; A plurality of disc plates 12 mounted at intervals along the outer circumferential surface of the axle shaft 10 so as to be integrally rotated with the axle shaft 10; A brake housing (20) installed at an end of the axle shaft (10) to surround the disc plate (12); A plurality of separation plates (14) disposed between the disc plates (12) and movably mounted on an inner circumferential surface of the brake housing (20); The braking piston 30 moves along the inner circumferential surface of the brake housing 20 by the introduced pressure oil and presses the separation plate 14 in a direction in which the disc plate 12 and the separation plate 14 are in close contact with each other. ; A parking piston (40) inserted into the inner diameter portion (32) of the braking piston (30) so as to pressurize the braking piston (30) and rotating in response to the operation of the parking lever; A fixing plate 60 fixed to the brake housing 20 so as to support a rear surface of the parking piston 40; And a forward means for advancing the parking piston (40) to pressurize the braking piston (30) as the parking piston (40) rotates. The plurality of first inclined grooves (70) of claim 1, wherein the forwarding means is formed at equal intervals on the rear surface of the parking piston (40) and is inclined in a direction opposite to the rotation direction of the parking piston (40). And a plurality of second inclined grooves 72 formed on the front surface of the fixing plate 60 so as to correspond to the first inclined grooves 70, and inclined in the rotational direction of the parking piston 40. Brake device of a wheel type industrial vehicle, characterized in that consisting of a plurality of balls (74) disposed between the first inclined groove (70) and the second inclined groove (72). According to claim 1, wherein the inner diameter portion 32 of the braking piston 30 is formed with a stepped pressing surface 36 along the inner circumferential surface so as to press the parking piston 40, the pressing surface Brake device of a wheel type industrial vehicle, characterized in that the thrust bearing 50 is disposed between the 36 and the driving piston 40.

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