Novel bulldozer parking braking system

Abstract

The utility model discloses a novel bulldozer parking braking system, and particularly relates to the technical field of bulldozers, the novel bulldozer parking braking system comprises a braking oil cylinder, a hydraulic pump, an overflow valve, a hydraulic valve and a braking belt which are arranged on the bulldozer, a first spring is fixedly arranged in the braking oil cylinder, one side of the interior of the braking oil cylinder is connected with a first piston in a sliding mode, and the other side of the braking oil cylinder is connected with a second piston. And the first spring is fixedly connected with the first piston. According to the novel bulldozer parking braking system, in actual work, the driving block slides rightwards under the action of the first piston rod, the braking rocker arm can rotate around the center shaft, at the moment, the roller climbs on the inclined face of the movable plate to drive the braking rocker arm to rotate clockwise around the center shaft, and at the moment, the right end of the braking rocker arm also swings rightwards; the second piston can be pushed to move rightwards in the swinging process, then the braking belt is held tightly, braking is achieved, the parking braking function can be automatically achieved under the condition that a main engine is not started, and the safety performance of the braking system is improved.

Description

Technical Field

[0001] This utility model relates to the field of bulldozer technology, and in particular to a novel bulldozer parking brake system. Background Technology

[0002] Bulldozers mainly rely on the main unit to output thrust for bulldozing or loosening soil. When the main unit encounters an emergency while traveling or operating, braking is required. In addition, to ensure the safety of the main unit during shutdown or transportation, the main unit's parking brake is controlled by mechanical linkage. Currently, the driving brake and parking brake functions of common bulldozers are usually achieved by controlling the brake band to tighten the brake.

[0003] A search revealed, for example, a utility model with announcement number CN205737494U, which discloses a novel bulldozer braking system. Currently, the parking brake requires the brake pedal to be pressed while the engine is running before the parking brake lever can be operated. Otherwise, improper operation may occur, or the operator may forget to pull the parking brake lever, resulting in the danger of the vehicle "slipping." Therefore, the current parking brake operation has certain safety defects. In order to solve the above defects, the inventor proposes a novel bulldozer parking brake system. Utility Model Content

[0004] The main purpose of this utility model is to provide a new type of bulldozer parking brake system, which can effectively solve the problem of certain safety defects in the existing braking system.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A novel bulldozer parking brake system includes a brake cylinder, a hydraulic pump, an overflow valve, a hydraulic valve, and a brake band installed on the bulldozer. A first spring is fixedly installed inside the brake cylinder. A first piston is slidably connected to one side of the inside of the brake cylinder, and the first spring is fixedly connected to the first piston. A first piston rod is fixedly installed in the middle of the side of the first piston away from the first spring, and the end of the first piston rod away from the first piston extends to the outside of the brake cylinder and is fixedly installed with a drive block.

[0007] The brake band has a drive cylinder on one side, and a second piston rod inside the drive cylinder. A fixed frame is provided on one side of the outer surface of the drive cylinder, and a brake rocker arm is hinged inside the fixed frame. One end of the brake rocker arm is hinged to the second piston rod, and the other end of the brake rocker arm is rotatably connected to a roller.

[0008] Preferably, the outlet of the hydraulic pump is fixedly connected to the inlet of the relief valve via a pipeline, the outlet of the relief valve is fixedly connected to the inlet of the hydraulic valve via a pipeline, and the outlet of the hydraulic valve is fixedly connected to one of the oil ports of the brake cylinder via a pipeline.

[0009] Preferably, an oil tank is provided on one side of the hydraulic pump, the inlet of the hydraulic pump is fixedly connected to the oil tank through a pipeline, and the other oil port of the brake cylinder is fixedly connected to the oil tank through a pipeline.

[0010] Preferably, a movable plate is hinged to one side of the top surface of the drive block, and the roller rolls in contact with the top surface of the movable plate. A movable groove is provided inside the drive block. A threaded rod is rotatably connected to one side of the movable groove, and a slide rod is fixedly installed on the other side of the movable groove. A movable plate is threadedly connected to the outer surface of the threaded rod, and the movable plate is slidably connected to the slide rod.

[0011] Preferably, the top surface of the movable plate is hinged with two drive arms, and the ends of the two drive arms away from the movable plate are hinged to the bottom surface of the movable plate. A micro motor is fixedly installed on one side of the outer surface of the drive block, and the output end of the micro motor is fixedly connected to the threaded rod.

[0012] Preferably, a connecting plate is provided on one side of the first piston, and the connecting plate is sleeved on the outer end of the first piston rod. A plurality of connecting holes are provided on one side of the connecting plate, and a plurality of mounting holes are provided on one side of the first piston located on the connecting plate. The plurality of mounting holes correspond one-to-one with the plurality of connecting holes. A plurality of rubber blocks are fixedly installed on one side of the connecting plate.

[0013] Preferably, a second piston is slidably connected inside the drive cylinder, and the second piston is fixedly connected to the second piston rod. A connecting arm is fixedly installed in the middle of the side of the second piston away from the second piston rod, and the end of the connecting arm away from the second piston extends to the outside of the drive cylinder and is hinged to the brake band.

[0014] Preferably, a second spring is fixedly installed inside the drive cylinder, and the second spring is sleeved on the outer end of the connecting arm, and the second spring is fixedly connected to the second piston.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This utility model discloses a novel bulldozer parking brake system, which, by incorporating a brake cylinder, enables the following in practical operation:

[0017] 1. When the hydraulic valve does not input pressurized oil into the brake cylinder, the first piston will push out to the right under the action of the first spring, causing the drive block to slide to the right under the action of the first piston rod. The brake rocker arm can rotate around the central axis. At this time, the roller climbs on the inclined surface of the movable plate, driving the brake rocker arm to rotate clockwise around the central axis. At this time, the right end of the brake rocker arm also swings to the right. The swinging process will push the second piston to move to the right, thereby tightening the brake band and realizing braking. This allows the main engine to automatically realize the parking brake function without starting, improving the safety performance of the braking system.

[0018] 2. The micro motor drives the threaded rod to rotate, which in turn moves the two moving plates. The two drive arms then push the movable plate to flip, thereby adjusting the tilt angle of the movable plate and optimizing the braking performance to meet different working conditions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the brake cylinder of this utility model;

[0021] Figure 3 For the present utility model Figure 2 Enlarged view of section A in the middle;

[0022] Figure 4 This is a schematic diagram of the internal structure of the brake cylinder of this utility model;

[0023] Figure 5 This is a schematic diagram of the drive block structure of this utility model;

[0024] Figure 6 This is a cross-sectional view of the drive cylinder of this utility model.

[0025] In the diagram: 1. Hydraulic pump; 2. Relief valve; 3. Hydraulic valve; 4. Oil tank; 5. Brake cylinder; 6. Drive block; 7. Drive cylinder; 8. Brake band; 701. Brake rocker arm; 702. Roller; 703. Fixing frame; 501. First spring; 502. First piston; 503. First piston rod; 5021. Mounting hole; 5022. Connecting plate; 5023. Rubber block; 5024. Connecting hole; 601. Movable groove; 602. Threaded rod; 603. Micro motor; 604. Slide rod; 605. Moving plate; 606. Drive arm; 607. Movable plate; 7021. Second piston rod; 7022. Second piston; 7023. Second spring; 7024. Connecting arm. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] This utility model discloses a novel bulldozer parking brake system, such as Figure 1-6 As shown, the system includes a brake cylinder 5, a hydraulic pump 1, an overflow valve 2, a hydraulic valve 3, and a brake band 8, all mounted on a bulldozer. The outlet of the hydraulic pump 1 is fixedly connected to the inlet of the overflow valve 2 via a pipe. The outlet of the overflow valve 2 is fixedly connected to the inlet of the hydraulic valve 3 via a pipe. The outlet of the hydraulic valve 3 is fixedly connected to one of the oil ports of the brake cylinder 5 via a pipe.

[0028] The hydraulic pump 1 pressurizes the hydraulic oil and inputs it into the cylinder chamber of the brake cylinder 5. The oil pressure acts on the first piston 502, generating a leftward hydraulic pressure that overcomes the spring force of the left side of the cylinder 501 and pushes the first piston 502 to move linearly, causing the first piston rod 503 to drive the drive block 6 to move.

[0029] When the driving gear of hydraulic pump 1 rotates, the driving gear drives the driven gear to rotate. The teeth of the two gears gradually disengage, and a partial vacuum is formed on the disengaged side. The oil in tank 4 enters the sealed cavity through the connected pipe and suction port under atmospheric pressure. When the gears are engaged, the volume of the sealed cavity gradually decreases. The oil is squeezed by the gear teeth and pushed towards the pressure port. After the pressure increases, it is output to the hydraulic system. The gears continue to rotate, and the suction and pressure processes alternate to form a continuous oil delivery.

[0030] The overflow valve 2 achieves pressure control by balancing the hydraulic pressure and the spring force.

[0031] The friction material on the inner surface of the brake band 8 comes into close contact with the inner surface of the rotating brake drum, generating frictional force that hinders the rotation of the brake drum, thereby slowing down or stopping the wheels to brake the bulldozer.

[0032] When the bulldozer starts, the hydraulic pump 1 is driven by the gear transmission of the transfer case to output pressurized oil. The pressure oil is then supplied to the hydraulic valve 3 through the relief valve 2 to the set pressure value. The hydraulic valve 3 is a 2-position 3-way hydraulic valve. When the hydraulic valve 3 is opened, the pressurized oil enters the brake cylinder 5, causing the first piston rod 503 to drive the drive block 6 to move to the left. The roller 702 then moves downward along the inclined surface of the movable plate 607, causing the brake rocker arm 701 to rotate counterclockwise around the central axis. This stops the force on the second piston 7022 to the right, and the second spring 7023 pushes the second piston 7022 to the left, causing the brake band 8 to relax. At this point, the parking brake is released, and the vehicle can travel and operate normally after the parking brake is released.

[0033] In actual production, an electronic control switch can also be set to control the hydraulic valve 3, so that the braking function can be activated after the engine is started, ensuring the safety of the main unit when it is on a slope and improving the safety of the vehicle parking, slope operation and parking.

[0034] A first spring 501 is fixedly installed inside the brake cylinder 5. A first piston 502 is slidably connected to one side of the brake cylinder 5, and the first spring 501 is fixedly connected to the first piston 502. A first piston rod 503 is fixedly installed in the middle of the side of the first piston 502 away from the first spring 501. The end of the first piston rod 503 away from the first piston 502 extends to the outside of the brake cylinder 5 and a drive block 6 is fixedly installed thereon. When pressurized oil enters the interior of the brake cylinder 5 through the pipe and the oil port, it will push the first piston 502 to move to the left and squeeze the first spring 501. At this time, the first piston rod 503 drives the drive block 6 to move to the left together.

[0035] A drive cylinder 7 is provided on one side of the brake band 8, and a second piston rod 7021 is provided inside the drive cylinder 7. A fixed frame 703 is provided on one side of the outer surface of the drive cylinder 7, and a brake rocker arm 701 is hinged inside the fixed frame 703. One end of the brake rocker arm 701 is hinged to the second piston rod 7021, and the other end of the brake rocker arm 701 is rotatably connected to a roller 702.

[0036] When the hydraulic valve 3 does not input pressure oil into the brake cylinder 5, the first piston 502 will push to the right under the action of the first spring 501, causing the drive block 6 to slide to the right under the action of the first piston rod 503. The brake rocker arm 701 can rotate around the central axis. At this time, the roller 702 climbs on the inclined surface of the movable plate 607, driving the brake rocker arm 701 to rotate clockwise around the central axis. At this time, the right end of the brake rocker arm 701 also swings to the right. The swinging process will push the second piston 7022 to move to the right, thereby tightening the brake band 8 and realizing braking.

[0037] A hydraulic pump 1 has an oil tank 4 on one side, which stores hydraulic oil. The inlet of the hydraulic pump 1 is fixedly connected to the oil tank 4 through a pipe. The other oil port of the brake cylinder 5 is located on the side of the spring cavity of 501 and is fixedly connected to the oil tank 4 through a pipe. The oil inside the spring cavity of the brake cylinder 5 is only the oil that leaks from the right side and flows back to the oil tank 4 through the spring cavity pipeline.

[0038] A movable plate 607 is hinged to one side of the top surface of the drive block 6, and the roller 702 rolls in contact with the top surface of the movable plate 607. A movable groove 601 is provided inside the drive block 6. A threaded rod 602 is rotatably connected to one side of the movable groove 601, and a slide rod 604 is fixedly installed on the other side of the movable groove 601. A movable plate 605 is threadedly connected to the outer surface of the threaded rod 602, and the movable plate 605 is slidably connected to the slide rod 604.

[0039] When the threaded rod 602 rotates, the movable plate 605 will move along the slide rod 604.

[0040] Two drive arms 606 are hinged to the top surface of the movable plate 605, and the ends of the two drive arms 606 away from the movable plate 605 are hinged to the bottom surface of the movable plate 607. A micro motor 603 is fixedly installed on one side of the outer surface of the drive block 6, and the output end of the micro motor 603 is fixedly connected to the threaded rod 602. The micro motor 603 is powered by the internal power supply of the bulldozer and can drive the threaded rod 602 to rotate.

[0041] When the micro motor 603 drives the threaded rod 602 to rotate, the movable plate 607 will move along the slide rod 604. When the movable plate 607 moves, the two drive arms 606 will push the movable plate 607 to tilt, thereby adjusting the tilt angle of the movable plate 607.

[0042] The larger the slope angle of the movable plate 607, the greater the normal force component of the drive block 6 on the roller 702. Under the same thrust, the vertical reaction force output by the roller 702, i.e. the braking force, is greater. This is suitable for parking on steep slopes where a large braking force needs to be generated quickly.

[0043] The reduced slope angle of the movable plate 607 will decrease the normal force component, thereby weakening the braking force output. This makes it suitable for scenarios requiring gentle braking and avoids overload damage to the brake band 8.

[0044] A connecting plate 5022 is provided on one side of the first piston 502, and the connecting plate 5022 is sleeved on the outer end of the first piston rod 503. A plurality of connecting holes 5024 are provided on one side of the connecting plate 5022. A plurality of mounting holes 5021 are provided on one side of the first piston 502, and the plurality of mounting holes 5021 correspond one-to-one with the plurality of connecting holes 5024. By inserting bolts into the overlapping mounting holes 5021 and connecting holes 5024, the connecting plate 5022 and the first piston 502 can be installed. A plurality of rubber blocks 5023 are fixedly installed on one side of the connecting plate 5022. The rubber blocks 5023 can contact the inner wall of the right side of the brake cylinder 5 when the first piston 502 moves to the right due to the elasticity of the first spring 501, thereby reducing the impact between the first piston 502 and the inner wall of the brake cylinder 5 when the spring returns to its original position, and reducing noise and component wear.

[0045] The drive cylinder 7 has a second piston 7022 slidably connected inside, and the second piston 7022 is fixedly connected to the second piston rod 7021. A connecting arm 7024 is fixedly installed on the middle part of the side of the second piston 7022 away from the second piston rod 7021, and the end of the connecting arm 7024 away from the second piston 7022 extends to the outside of the drive cylinder 7 and is hinged to the brake band 8.

[0046] When the second piston rod 7021 drives the second piston 7022 to move, it will drive the connecting arm 7024 to move, thereby controlling the brake band 8.

[0047] A second spring 7023 is fixedly installed inside the drive cylinder 7, and the second spring 7023 is sleeved on the outer end of the connecting arm 7024. The second spring 7023 is fixedly connected to the second piston 7022.

[0048] The working principle of this utility model is as follows: When the bulldozer starts, the hydraulic pump 1 is driven to operate and output pressure oil through the gear transmission of the transfer case. The pressure oil is adjusted to the set pressure value through the overflow valve 2 and supplied to the hydraulic valve 3. The oil enters the brake cylinder 5 through the hydraulic valve 3, so that the first piston 502 moves to the left and squeezes the first spring 501. The first piston 502 will drive the first piston rod 503 and the drive block 6 to move to the left together. Then the roller 702 moves downward along the inclined surface of the movable plate 607, braking the rocker arm 701 to rotate counterclockwise around the central axis. The second piston 7022 is no longer given a force to the right. The second spring 7023 will push the second piston 7022 to move to the left, so that the brake band 8 is in a relaxed state. At this time, the parking brake is released. After the parking brake is released, the whole vehicle can travel and operate normally.

[0049] When the bulldozer's engine is not running, the hydraulic valve 3 will not output pressurized oil to the brake cylinder 5. The first piston 502 will be pushed to the right by the first spring 501, causing the drive block 6 to slide to the right under the action of the first piston rod 503. The brake rocker arm 701 can rotate around the central axis. At this time, the roller 702 climbs on the inclined surface of the movable plate 607, driving the brake rocker arm 701 to rotate clockwise around the central axis. At this time, the right end of the brake rocker arm 701 also swings to the right. The swinging process will push the second piston 7022 to move to the right, thereby tightening the brake band 8 and realizing braking.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A new bulldozer parking brake system comprising a brake cylinder (5) mounted on the bulldozer, a hydraulic pump (1), a relief valve (2), a hydraulic valve (3) and a brake band (8), characterized in that: The inside of the brake oil cylinder (5) is fixedly provided with a first spring (501), one side of the inside of the brake oil cylinder (5) is slidably connected with a first piston (502), and the first spring (501) is fixedly connected with the first piston (502); a first piston rod (503) is fixedly arranged at the middle of the side, away from the first spring (501), of the first piston (502), and one end of the first piston rod (503), away from the first piston (502), extends to the outside of the brake oil cylinder (5) and is fixedly provided with a driving block (6); One side of the brake belt (8) is provided with a driving cylinder (7), and the inside of the driving cylinder (7) is provided with a second piston rod (7021); one side of the outer surface of the driving cylinder (7) is provided with a fixing frame (703), and the inside of the fixing frame (703) is hingedly connected with a brake rocker arm (701); one end of the brake rocker arm (701) is hingedly connected with the second piston rod (7021), and the other end of the brake rocker arm (701) is rotatably connected with a roller (702).

2. A new bulldozer parking brake system according to claim 1, characterized in that: The outlet of the hydraulic pump (1) is fixedly connected with the inlet of the overflow valve (2) through a pipeline, the outlet of the overflow valve (2) is fixedly connected with the inlet of the hydraulic valve (3) through a pipeline, and the outlet of the hydraulic valve (3) is fixedly connected with one oil port of the brake oil cylinder (5) through a pipeline.

3. A new bulldozer parking brake system according to claim 1, characterized in that: One side of the hydraulic pump (1) is provided with an oil tank (4), the inlet of the hydraulic pump (1) is fixedly connected with the oil tank (4) through a pipeline, and the other oil port of the brake oil cylinder (5) is fixedly connected with the oil tank (4) through a pipeline.

4. A new bulldozer parking brake system according to claim 1, characterized in that: One side of the top surface of the driving block (6) is hingedly connected with a movable plate (607), and the roller (702) is in rolling contact with the top surface of the movable plate (607); the inside of the driving block (6) is provided with a movable groove (601), one side of the inside of the movable groove (601) is rotatably connected with a threaded rod (602), and the other side of the inside of the movable groove (601) is fixedly provided with a sliding rod (604); the outer surface of the threaded rod (602) is threadedly connected with a moving plate (605), and the moving plate (605) is slidably connected with the sliding rod (604).

5. A new bulldozer parking brake system according to claim 4, characterized in that: The top surface of the moving plate (605) is hingedly connected with two driving arms (606), and one end of each of the two driving arms (606), away from the moving plate (605), is hingedly connected with the bottom surface of the movable plate (607); one side of the outer surface of the driving block (6) is fixedly provided with a micro motor (603), and the output end of the micro motor (603) is fixedly connected with the threaded rod (602).

6. A new bulldozer parking brake system according to claim 1, characterized by: One side of the first piston (502) is provided with a connecting plate (5022), and the connecting plate (5022) is sleeved on the outer end of the first piston rod (503); a plurality of connecting holes (5024) are formed in one side of the connecting plate (5022); a plurality of mounting holes (5021) are formed in one side of the first piston (502), and the plurality of mounting holes (5021) correspond to the plurality of connecting holes (5024) in a one-to-one manner; and a plurality of rubber blocks (5023) are fixedly arranged on one side of the connecting plate (5022).

7. A new bulldozer parking brake system according to claim 1, characterized in that: The inside of the driving cylinder (7) is slidably connected with a second piston (7022), and the second piston (7022) is fixedly connected with a second piston rod (7021), a connecting arm (7024) is fixedly installed at the middle of the side of the second piston (7022) away from the second piston rod (7021), and one end of the connecting arm (7024) away from the second piston (7022) extends to the outside of the driving cylinder (7) and is hingedly connected with the brake belt (8).

8. A new bulldozer parking brake system according to claim 7, characterized by: The inside of the driving cylinder (7) is fixedly installed with a second spring (7023), the second spring (7023) is sleeved on the outer end of the connecting arm (7024), and the second spring (7023) is fixedly connected with the second piston (7022).

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