A parking brake for a bulldozer

Abstract

The utility model is suitable for bulldozer technical field provides a kind of parking brake for bulldozer, including shell and second fixed peg, the inside of shell is sequentially provided with disc spring, piston, piston baffle ring and pressure disc, the top end of disc spring is attached in the inside of shell, the piston is set below disc spring, the piston baffle ring is sleeved on the lower sidewall of piston, the pressure disc is attached below piston baffle ring, the piston includes piston main body, by disc spring, piston, piston baffle ring and pressure disc are all installed in shell inside formation module, make parking brake independently assembled on final transmission shell, when maintaining final transmission, only remove the mounting bolt of brake to realize maintenance when changing brake disc spring, reach without using special tool press pack disc spring, direct disassembly can be achieved, improve the effect of maintenance convenience.

Description

Technical Field

[0001] This utility model relates to the field of bulldozer technology, and more specifically, to a parking brake for bulldozers. Background Technology

[0002] The bulldozer's brake is a multi-plate wet hydraulic-mechanical composite system. By using hydraulic release and spring holding, it locks the travel and transmission mechanisms the moment power is cut off. It can provide reliable and durable braking force under full load downhill or emergency conditions, while also withstanding the huge impact and mud and sand erosion brought by the tracked chassis.

[0003] Currently, disc springs in bulldozers undergo permanent deformation and fatigue cracks after long-term high-load operation, resulting in decreased elasticity, buffer failure, and inability to maintain track tension. This can lead to track derailment, abnormal wear of drive wheels, and other malfunctions. Regular replacement is necessary to maintain the stability of the walking system. In existing technologies, special tooling is typically used to achieve smooth compression and precise positioning installation through guide columns and hydraulic mechanisms.

[0004] However, this installation method requires special tooling to replace the disc spring, which is not conducive to maintenance and replacement.

[0005] Therefore, this utility model proposes a parking brake for bulldozers. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a parking brake for bulldozers.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This utility model is further configured as follows: A bulldozer parking brake includes a bearing housing detachably connected to the housing, a disc spring, a piston, a piston retaining ring, and a pressure plate arranged sequentially inside the housing. The housing has a stepped portion, one end of the disc spring abuts against the stepped portion, and the other end of the disc spring abuts against the piston.

[0008] The present invention is further configured such that the bulldozer parking brake also includes an internal gear ring disposed between the housing and the bearing seat.

[0009] The present invention is further configured such that: a friction plate and a partition are provided inside the internal gear ring.

[0010] According to the above-described bulldozer parking brake, the friction pads and partitions are installed alternately.

[0011] The present invention is further configured such that: the piston includes a piston body, the piston body is provided with a mounting hole, and the pressure plate is provided with a through hole adapted to the mounting hole.

[0012] The present invention is further configured such that: the parking brake also includes a third fixing bolt and a second fixing bolt; the piston retaining ring is provided with a through hole; the output end of the third fixing bolt passes through the through hole and is fixed to the housing; and the output end of the second fixing bolt passes through the mounting hole and is adapted to be installed with the through hole on the pressure plate.

[0013] The present invention is further configured such that: the parking brake also includes a first fixing bolt, the housing includes a fixing body, and a positioning groove is provided on the side of the fixing body.

[0014] The present invention is further configured such that: the internal gear ring is provided with a through hole adapted to the positioning groove, and the bearing seat is provided with a through hole adapted to the positioning groove.

[0015] The present invention is further configured such that: the output end of the first fixing bolt penetrates the positioning groove and the through hole of the internal gear ring and is then fitted and installed with the through hole of the bearing seat.

[0016] The present invention is further configured such that: the piston also includes a mounting groove, and a sealing ring is fitted on the mounting groove.

[0017] In summary, this application includes at least one of the following beneficial technical effects: By installing the disc spring, piston, piston retainer, and pressure plate inside the housing to form a module, the parking brake is independently assembled on the final drive housing. When maintaining the final drive or changing the brake disc spring, maintenance can be performed simply by removing the brake mounting bolts. This achieves the effect of improving the convenience of maintenance by eliminating the need for special tooling to press the disc spring and allowing for direct disassembly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a bulldozer parking brake according to the present invention.

[0019] Figure 2 for Figure 1 A schematic diagram of the explosion structure.

[0020] Figure 3 for Figure 1 Top view.

[0021] Figure 4 for Figure 3 A cross-sectional view along the AA direction.

[0022] Figure 5 for Figure 2 A schematic diagram of the overall structure of the piston; Figure 6 for Figure 2 A schematic diagram of the overall structure of the middle shell; Explanation of reference numerals in the attached drawings: 1. Internal gear ring; 2. Partition plate; 3. Friction plate; 4. Pressure plate; 5. Piston retaining ring; 6. Piston; 61. Piston body; 62. Mounting hole; 63. Mounting groove; 7. Sealing ring; 8. Housing; 81. Fixing body; 82. Positioning groove; 9. Disc spring; 10. Bearing seat; 11. First fixing bolt; 12. Second fixing bolt; 13. Third fixing bolt; 14. Stepped section; Detailed Implementation It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] Example 1, please refer to Figures 1-6 The present invention provides the following technical solution: See Figure 1 , Figure 2 and Figure 5 A bulldozer parking brake includes a housing 8 and a second fixing bolt 12. A disc spring 9, a piston 6, a piston retaining ring 5 and a pressure plate 4 are sequentially arranged on the internal stepped portion 14 of the housing 8. One end of the disc spring 9 abuts against the stepped portion, and the other end of the disc spring 9 abuts against the piston 6.

[0025] The piston 6 is positioned below the disc spring 9, and the piston retaining ring 5 is fitted onto the lower side wall of the piston 6, serving as a limit and support. The pressure plate 4 is in contact with the piston retaining ring 5 from below. The piston 6 includes a piston body 61, on which mounting holes 62 are arranged in a circular array. The pressure plate 4 has through holes adapted to the mounting holes 62. The output ends of multiple second fixing bolts 12 pass through the mounting holes 62 and are fitted to the through holes on the pressure plate 4, together forming a complete braking actuation module.

[0026] The housing 8 provides an installation position. The disc spring 9, piston 6, piston retaining ring 5 and pressure plate 4 are tightly fitted inside the housing 8. The second fixing bolt 12 fixes the piston body 61 to the pressure plate 4 and restricts the position of the piston retaining ring 5. Multiple second fixing bolts 12 pass through the mounting hole 62 and connect to the pressure plate 4 to secure the piston 6 and the pressure plate 4, while restricting the axial movement range of the piston retaining ring 5.

[0027] By installing the disc spring 9, piston 6, piston retaining ring 5, and pressure plate 4 inside the housing 8 to form a module, when performing maintenance on the final drive system or replacing the brake disc spring 9, only the mounting bolts of the housing 8 need to be removed to remove the entire brake module as a whole. There is no need to use special tools to press the disc spring 9, which achieves the effect of not needing to use special tools to press the disc spring 9, and can be directly disassembled, thus improving the convenience of maintenance.

[0028] See Figure 3 , Figure 4 and Figure 6 The piston 6 also includes a mounting groove 63, on which a sealing ring 7 is fitted. The sealing ring 7 is set on the mounting groove 63. After assembly, the sealing ring 7 undergoes elastic deformation, effectively filling the fitting gap between the piston 6 and the inner wall of the housing 8. This not only provides a sealing function but also reduces the frictional resistance between the piston and the housing during reciprocating motion, ensuring sensitive braking response and smooth return.

[0029] The disc spring 9 serves as the source of braking force, pushing the piston 6 towards the friction pair in a free state. This friction pair is composed of alternating combinations of friction plates 3 and partitions 2. The disc spring 9 is used to elastically drive the piston 6 towards the friction pair composed of friction plates 3 and partitions 2. The piston 6 can switch between the braking state of pressing against the friction pair and the braking state of moving away from the friction pair. When hydraulic oil is introduced into the oil passage, the piston 6 switches to the braking state. When the hydraulic oil is stopped from being introduced into the oil passage, the piston 6 switches to the braking state. An internal gear ring 1 is installed below the pressure plate 4. Inside the ring are several friction plates 3 and partitions 2. The outer edge of the friction plates 3 is machined with splines to mesh with the internal gear ring 1. The partitions 2 are connected to the input shaft through internal splines.

[0030] A bearing housing 10 is provided below the internal gear ring 1. The parking brake also includes a first fixing bolt 11 and a third fixing bolt 13. The piston retaining ring 5 is provided with a circular through hole. The output end of the third fixing bolt 13 passes through the through hole and is fixed to the housing 8. The housing 8 includes a fixing body 81, and a circular array of positioning grooves 82 is provided on the side of the fixing body 81. The internal gear ring 1 is provided with a circular array of through holes that are adapted to the positioning grooves 82. The bearing housing 10 is provided with a circular array of through holes that are adapted to the positioning grooves 82. The output end of the first fixing bolt 11 penetrates the positioning grooves 82 and the through hole of the internal gear ring 1 and is fitted into the through hole of the bearing housing 10. The internal gear ring 1 is fixed between the bearing housing 10 and the housing 8 by bolts. A bearing seat 10 is provided at the bottom of the internal gear ring 1 and is connected to the housing 8 by a first fixing bolt 11. Multiple positioning grooves 82 are provided around the periphery of the fixing body 81 of the housing 8, and corresponding holes are machined at the corresponding positions of the internal gear ring 1 and the bearing seat 10. The first fixing bolt 11 passes through the positioning grooves 82 and the internal gear ring 1, and is finally fixed to the bearing seat 10, thereby clamping and fixing the internal gear ring 1 between the housing 8 and the bearing seat 10. Then, through the spline of the partition plate 2 and the input shaft, the friction pair formed by the friction plate 3 and the partition plate 2 achieves parking braking after the piston 6 presses it.

[0031] In its natural state, the disc spring 9 drives the piston 6 to move towards the friction pair composed of the friction plate 3 and the partition 2, thereby realizing the closed parking brake function. When the vehicle is not running, since there is no hydraulic oil input, the parking brake automatically applies braking force when the disc spring 9 loses hydraulic pressure by utilizing its compression energy storage characteristics, thereby realizing the parking brake. When the vehicle is running, hydraulic oil enters the brake piston 6 cavity through electro-hydraulic control, thereby realizing the release of the parking brake function.

[0032] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

Claims

1. A parking brake for a bulldozer, characterized in that: Includes a bearing seat (10) detachably connected to the housing (8), a disc spring (9), a piston (6), a piston retaining ring (5) and a pressure plate (4) arranged sequentially inside the housing (8). A step (14) is provided inside the housing (8). One end of the disc spring (9) abuts against the step, and the other end of the disc spring (9) abuts against the piston (6).

2. The bulldozer parking brake according to claim 1, characterized in that: The bulldozer parking brake also includes an internal gear ring (1) disposed between the housing (8) and the bearing seat (10).

3. A parking brake for a bulldozer according to claim 2, characterized in that: The internal gear ring (1) is provided with a friction plate (3) and a partition plate (2).

4. A parking brake for a bulldozer according to claim 3, characterized in that: The friction plate (3) and the partition plate (2) are installed alternately.

5. A bulldozer parking brake according to claim 1, characterized in that: The piston (6) includes a piston body (61), on which a mounting hole (62) is provided, and on the pressure plate (4) a through hole adapted to the mounting hole (62).

6. A bulldozer parking brake according to claim 5, characterized in that: The parking brake also includes a third fixing bolt (13) and a second fixing bolt (12). The piston retaining ring (5) is provided with a through hole. The output end of the third fixing bolt (13) passes through the through hole and is fixed to the housing (8). The output end of the second fixing bolt (12) passes through the mounting hole (62) and is adapted to the through hole on the pressure plate (4) for installation.

7. A bulldozer parking brake according to claim 2, characterized in that: The parking brake also includes a first fixing bolt (11), and the housing (8) includes a fixing body (81), with a positioning groove (82) provided on the side of the fixing body (81).

8. A bulldozer parking brake according to claim 7, characterized in that: The internal gear ring (1) is provided with a through hole that matches the positioning groove (82), and the bearing seat (10) is provided with a through hole that matches the positioning groove (82).

9. A parking brake for a bulldozer according to claim 8, characterized in that: The output end of the first fixing bolt (11) penetrates the positioning groove (82) and the through hole of the internal gear ring (1) and is then fitted to the through hole of the bearing seat (10) for installation.

10. A bulldozer parking brake according to claim 1, characterized in that: The piston (6) also includes a mounting groove (63), on which a sealing ring (7) is fitted.

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