Novel hydraulic brake release control system for wheel-side electrically-driven speed reducer

Abstract

The utility model discloses a novel hydraulic brake release control system for a wheel-side electrically-driven speed reducer, belongs to the technical field of brake systems, and solves the problem that manual operation of an existing brake release control system is troublesome. The hydraulic system comprises a one-way oil supply device, an energy accumulator, a zero-leakage reversing valve and a control valve, wherein the one-way oil supply device comprises an oil tank, an oil pump and a first one-way valve; the input end of the oil pump is communicated with the oil tank, the output end of the oil pump is connected with the input end of the first one-way valve through an oil pipe, the output end of the first one-way valve is connected with the energy accumulator, and the pressure reducing valve is installed on the oil pipe, connected with the first one-way valve, of the oil pump. And the opening valve can be opened under the acting force of oil pressure and is arranged between the pressure reducing valve and the hydraulic cylinder. According to the brake release control system, oil can be automatically supplied to the energy accumulator, manual operation is not needed, cost is low, the service life is long, and safety is high.

Description

Technical Field

[0001] The utility model relates to the technical field of brake systems, and more specifically, to a novel wheel-side electric drive reducer hydraulic brake release control system. Background Art

[0002] At present, traditional skid steer loaders are powered by engines and driven by hydraulic motors. When traveling, the system has high-pressure hydraulic oil to drive the travel motor, so it can provide high-pressure hydraulic oil to the braking system in real time to enable the spring parking device to release the parking brake on the brake disc.

[0003] In the prior patent application of the applicant, the announcement number is: CN219345106U, which discloses a wheel-side electric drive reducer hydraulic brake release control system, which relates to a brake system. It includes a one-way oil supply device for providing high-pressure hydraulic oil; an accumulator for storing the high-pressure hydraulic oil; a zero-leakage reversing valve for opening the pipeline between the accumulator and the spring parking device when receiving a brake release command, so that the high-pressure hydraulic oil is delivered to the spring parking device; and when receiving a brake command, the pipeline between the accumulator and the spring parking device is cut off; a control valve is installed between the spring parking device and the connecting pipeline of the one-way oil supply device. The utility model saves space, reduces costs, has a compact structure, avoids the power loss caused by the traditional brake release system requiring the oil pump to be in the rated power working state all the time, and plays a role in saving energy.

[0004] In the above brake release control system, the reversing valve is a manual valve, which requires manual operation during actual use, which is troublesome.

[0005] Therefore, it is urgent to design a new type of wheel-side electric drive reducer hydraulic brake release control system to solve the above-mentioned technical problems. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a novel wheel-side electric drive reducer hydraulic brake release control system in view of the above-mentioned deficiencies in the prior art, which can realize automatic oil supply to the accumulator without manual operation, and has low cost, long service life and high safety.

[0007] The technical solution of the utility model is as follows: a novel wheel-side electric drive reducer hydraulic brake release control system, including a one-way oil supply device, an accumulator, a zero-leakage reversing valve, and a control valve, the one-way oil supply device including a fuel tank, an oil pump and a first one-way valve; the input end of the oil pump is connected to the fuel tank, the output end of the oil pump is connected to the input end of the first one-way valve through an oil pipe, the output end of the first one-way valve is connected to the accumulator, the output end of the oil pump is connected to the hydraulic cylinder of the skid loader through a reversing valve, the one-way oil supply device also includes a pressure reducing valve, the pressure reducing valve is installed on the oil pipe connecting the oil pump and the first one-way valve, and also includes an opening valve that can be opened under the action of oil pressure, and the opening valve is installed between the pressure reducing valve and the hydraulic cylinder.

[0008] As a further improvement, the output end of the accumulator is connected to the input end of the zero-leakage reversing valve, the output end of the zero-leakage reversing valve is connected to the input end of the spring parking device, the spring parking device is connected to the oil tank through a pipeline, and a control valve is installed on the pipeline connecting the spring parking device and the oil tank.

[0009] Furthermore, a pressure switch is installed on the pipeline connecting the zero-leakage reversing valve and the spring parking device, and the pressure switch is electrically connected to the travel motor through the ECU.

[0010] Furthermore, a second one-way valve is installed on the pipeline connecting the spring parking device and the zero-leakage reversing valve.

[0011] Furthermore, the opening valve is a relief valve, the relief valve is installed on the pipeline between the reversing valve and the pressure reducing valve, and the relief valve is electrically connected to the ECU.

[0012] Furthermore, the overflow valve is a pilot electromagnetic overflow valve, the P oil port of the pilot electromagnetic overflow valve is connected to the pipeline between the oil pump and the pressure reducing valve, the A oil port of the pilot electromagnetic overflow valve is connected to the input end of the reversing valve, and the T oil port of the pilot electromagnetic overflow valve is connected to the oil tank.

[0013] Furthermore, the opening valve is a back pressure valve, and the back pressure valve is installed on the reversing valve between the pressure reducing valve and the hydraulic cylinder.

[0014] Furthermore, the back pressure valve is installed on the pipeline between the reversing valve and the oil tank.

[0015] Furthermore, the opening pressure of the back pressure valve is 2 MPa.

[0016] Beneficial Effects

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. The brake release control system of the utility model, through the setting of the accumulator and the zero-leakage reversing valve, only needs to reserve high-pressure hydraulic oil in the accumulator in advance, so that when the brake disc needs to be released, there is no need to start the oil pump, and only the hydraulic oil in the accumulator needs to be sent to the spring brake, thereby avoiding the power loss caused by the traditional brake release system requiring the oil pump to be in the rated power working state all the time, and playing a role in saving energy.

[0019] 2. The brake release control system of the utility model installs an opening valve between the pressure reducing valve and the hydraulic cylinder. When the whole machine is powered on and the pipeline oil pressure reaches the set pressure of the opening valve, the opening valve opens, and oil is automatically supplied to the accumulator without manual operation. It has low cost, long service life and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0021] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0022] Figure 3 It is a structural schematic diagram of the zero leakage reversing valve in the utility model when it is in a self-locking release state;

[0023] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 5 It is a structural schematic diagram of the zero leakage reversing valve in the utility model when it is in a self-locking state.

[0025] Among them: 1-oil tank, 2-oil pump, 3-reversing valve, 4-hydraulic cylinder, 5-pressure reducing valve, 6-first one-way valve, 7-accumulator, 8-pressure switch, 9-zero leakage reversing valve, 10-spring parking device, 11-travel motor, 12-opening valve, 91-electromagnetic reversing valve, 92-valve core, 93-valve core locking solenoid valve, 94-valve stem, 95-spring, 96-limiting plate, 97-positioning groove. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0027] See also Figure 2-5 The utility model discloses a novel wheel-side electric drive reducer hydraulic brake release control system, which includes a one-way oil supply device, an accumulator 7, a zero-leakage reversing valve 9 and a control valve.

[0028] The one-way oil supply device is used to provide high-pressure hydraulic oil. The one-way oil supply device includes an oil tank 1, an oil pump 2, a pressure reducing valve 5 and a first one-way valve 6.

[0029] The input end of the oil pump 2 is connected to the oil tank 1, and the output end of the oil pump 2 is connected to the input end of the first check valve 6 through the oil pipe. The pressure reducing valve 5 is installed on the oil pipe connecting the oil pump 2 and the first check valve 6. The setting of the pressure reducing valve 5 can prevent the oil pressure input into the accumulator 7 from being too high, causing the oil pressure in the accumulator 7 to exceed the set pressure value. The output end of the first check valve 6 is connected to the accumulator 7. The first check valve 6 is used to prevent the hydraulic oil in the accumulator 7 from flowing back into the oil tank 1.

[0030] The accumulator 7 is used to store high-pressure hydraulic oil and transmit the high-pressure hydraulic oil to the outside.

[0031] In addition, the input end of the hydraulic cylinder 4 is connected to the output end of the oil pump 2 through the reversing valve 3. The hydraulic cylinder 4 is a hydraulic cylinder used for lifting the bucket on the skid loader. That is, the hydraulic cylinder 4 and the accumulator 7 of this embodiment share an oil pump 2. When the skid loader is just started, the oil pump 2 rotates. When the hydraulic cylinder 4 is not in action, the reversing valve 3 is in the middle position, and the oil of the oil pump 2 flows directly back to the oil tank. The pressure at the output port of the oil pump 2 is very low, and it is impossible to supply oil to the accumulator 7. When the reversing valve 3 is reversed, the oil path of the oil pump 2 flowing back to the oil tank is cut off, and the pressure at the output port of the oil pump 2 increases, and then the hydraulic oil is filled into the accumulator 7 or the hydraulic cylinder 4. Through such a setting, the dual-purpose function of a single pump is realized, which not only saves space and reduces costs, but also improves the overall compactness of the system.

[0032] The zero leakage reversing valve 9 is used to open the pipeline between the accumulator 7 and the spring parking device 10 when receiving a brake release command, so as to deliver high-pressure hydraulic oil to the spring parking device 10; and to cut off the pipeline between the accumulator 7 and the spring parking device 10 when receiving a brake command.

[0033] In this embodiment, the zero leakage reversing valve 9 is composed of an electromagnetic reversing valve 91 and a valve core self-locking structure for locking and positioning a valve core 92 of the electromagnetic reversing valve 91. The electromagnetic reversing valve 91 is of DLEH or DLEHM type.

[0034] The valve core self-locking structure includes a valve core locking solenoid valve 93, a valve stem 94, a spring 95, and a positioning groove 97 provided on the valve core 92 of the electromagnetic reversing valve 91. The valve core locking solenoid valve 93 is fixedly mounted on one end of the electromagnetic reversing valve 91, and the valve stem 94 is fixedly mounted on one end of the valve core of the valve core locking solenoid valve 93. The valve stem 94 moves through the housings of the valve core locking solenoid valve 93 and the electromagnetic reversing valve 91 in sequence, and contacts the valve core 92 of the electromagnetic reversing valve 91. A limiting plate 96 is fixedly provided on the side wall of one end of the valve stem 94 located in the electromagnetic reversing valve 91, and the spring 95 is sleeved on the valve stem 94 above the limiting plate 96.

[0035] When the electromagnetic reversing valve 91 is energized, the valve core 92 of the electromagnetic reversing valve 91 moves, and the position of the valve core 92 changes from Figure 3 Move the position shown to Figure 5 In the position shown, the internal channel of the electromagnetic reversing valve 91 is connected. Moreover, since the positioning groove 97 on the valve core 92 corresponds to the position of the valve stem 94, the valve stem 94 will fall into the positioning groove 97 under the action of the spring 95, realizing the self-locking of the valve core 92, so that the electromagnetic reversing valve 91 of the valve core 92 loses power, and the valve core 92 will not reset. That is, the hydraulic oil in the accumulator 7 can be supplied to the spring parking device 10 through the electromagnetic reversing valve 91, so that the spring parking device 10 is always in the parking release state.

[0036] After the travel motor 11 stops, the ECU sends an electrical signal to the valve core locking solenoid valve 93, so that it is energized first and then de-energized. When the valve core locking solenoid valve 93 is energized, the valve core of the valve core locking solenoid valve 93 moves upward, thereby driving the valve stem 94 to move upward and disengage from the positioning groove 97. At this time, the valve core 92 of the electromagnetic reversing valve 91 can be reset under the action of its internal reset spring, so that the inner cavity of the electromagnetic reversing valve 91 is in a closed state, thereby cutting off the supply of hydraulic oil to the spring parking device 10.

[0037] The control valve is installed between the connection pipeline of the spring parking device 10 and the oil tank 1. When the spring parking device 10 needs to release the braking state of the brake disc, the accumulator 7 supplies oil to the spring parking device 10, and the control valve is in a closed state, so that the pressure state of the hydraulic oil in the spring parking device 10 is consistent with that of the hydraulic oil in the accumulator 7. When the spring parking device 10 needs to be in a braking state on the brake disc, the control valve is opened to discharge the hydraulic oil in the spring parking device 10 into the oil tank 1, so that the spring parking device 10 is reset and the brake disc of the skid loader is braked.

[0038] In order to prevent the hydraulic oil in the spring parking device 10 from flowing back, a second one-way valve is installed on the pipeline connecting the spring parking device 10 and the zero-leakage reversing valve 9 .

[0039] A pressure switch 8 is installed on the pipeline connecting the zero leakage reversing valve 9 and the spring parking device 10, and the pressure switch 8 is electrically connected to the travel motor 11 through the ECU. The pressure switch 8 is used to control the action of the travel motor 11. When there is high-pressure hydraulic oil on the pipeline connecting the zero leakage reversing valve 9 and the spring parking device 10, the pressure switch 8 is closed, and the ECU sends a control signal to drive the travel motor 11 to start after receiving the electrical signal sent by the pressure switch 8.

[0040] The working principle of the utility model is as follows: when the skid loader is started, the oil pump 2 rotates. When the hydraulic cylinder 4 is not in action, the reversing valve 3 is in the middle position, and the oil of the oil pump 2 flows directly back to the oil tank. When the reversing valve 3 is reversed to make the pipeline between the oil pump 2 and the accumulator 7 conductive, the oil pump 2 delivers the hydraulic oil in the oil tank 1 to the accumulator 7. After the accumulator 7 is filled with high-pressure hydraulic oil, the reversing valve 3 is reversed again to be in the middle position. Since the oil pumped out of the oil pump 2 flows back to the oil tank 1 when the reversing valve 3 is in the middle position, the oil pump 2 can be in a closed or idling operation state at this time to reduce the consumption of electric energy, thereby saving energy.

[0041] When the spring parking device 10 needs to release the brake on the brake disc, the valve core 92 of the zero leakage reversing valve 9 is actuated to connect the pipeline between the accumulator 7 and the spring parking device 10, and the control valve is in a closed state, and the accumulator 7 supplies oil to the spring parking device 10, so that the spring parking device 10 releases the brake on the brake disc. When the brake disc needs to be braked, the valve core 92 of the zero leakage reversing valve 9 is reset to cut off the pipeline between the accumulator 7 and the spring parking device 10, and the control valve is in an open state, and the hydraulic oil in the spring parking device 10 flows back to the oil tank 1, so that the spring parking device 10 is reset and the brake disc is braked.

[0042] The brake release control system of the utility model further comprises an opening valve 12 which can be opened under the action of oil pressure, and the opening valve 12 is installed between the pressure reducing valve 5 and the hydraulic cylinder 4. By installing the opening valve between the pressure reducing valve and the hydraulic cylinder, when the whole machine is powered on and the pipeline oil pressure reaches the set pressure of the opening valve 12, the opening valve 12 opens, and oil can be automatically supplied to the accumulator without manual operation, and the cost is low, the service life is high, and the safety is high.

[0043] Example 1

[0044] like Figure 1 As shown, it is a specific embodiment of the utility model. In this embodiment, the opening valve 12 is a relief valve, which is installed on the pipeline between the reversing valve 3 and the pressure reducing valve 5, and the relief valve is electrically connected to the ECU. Specifically, the relief valve is a pilot electromagnetic relief valve, the P oil port of the pilot electromagnetic relief valve is connected to the pipeline between the oil pump 2 and the pressure reducing valve 5, the A oil port of the pilot electromagnetic relief valve is connected to the input end of the reversing valve 3, and the T oil port of the pilot electromagnetic relief valve is connected to the oil tank 1. The pilot electromagnetic relief valve is electrically connected to the ECU.

[0045] In this embodiment, when the whole machine is powered on and the pressure switch 8 detects that the pressure is less than the set pressure, the ECU controls the solenoid valve of the overflow valve to work, cuts off the oil return line of the pump, and supplies the oil of the pump to the accumulator 7, realizing automatic oil supply, without manual operation, and more convenient operation. This embodiment is mainly used in S150 skid loader.

[0046] Example 2

[0047] like Figure 2 As shown, it is another specific embodiment of the utility model. In this embodiment, the opening valve 12 is a back pressure valve, which is installed on the reversing valve 3 between the pressure reducing valve 5 and the hydraulic cylinder 4. Specifically, the back pressure valve is installed on the pipeline between the reversing valve 3 and the oil tank 1, and the opening pressure of the back pressure valve is set to 2Mpa.

[0048] In this embodiment, when the whole machine is powered on, as long as the oil pump 2 works, due to the blocking of the opening pressure of the back pressure valve 2Mpa, 2Mpa of pressure oil will be supplied to the accumulator 7, realizing mechanical opening and automatic oil supply, without manual operation, and the operation is more convenient. This embodiment is mainly used in Z25 wheel loaders.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A novel wheel-side electric drive reducer hydraulic brake release control system, comprising a one-way oil supply device, an accumulator (7), a zero-leakage reversing valve (9), and a control valve, wherein the one-way oil supply device comprises an oil tank (1), an oil pump (2), and a first one-way valve (6); the input end of the oil pump (2) is connected to the oil tank (1), the output end of the oil pump (2) is connected to the input end of the first one-way valve (6) through an oil pipe, the output end of the first one-way valve (6) is connected to the accumulator (7), the output end of the oil pump (2) is connected to the hydraulic cylinder (4) of the skid loader through a reversing valve (3), the one-way oil supply device also comprises a pressure reducing valve (5), the pressure reducing valve (5) is installed on the oil pipe connecting the oil pump (2) and the first one-way valve (6), and is characterized in that: It also comprises an opening valve (12) which can be opened under the action of oil pressure, and the opening valve (12) is installed between the pressure reducing valve (5) and the hydraulic cylinder (4).

2. According to claim 1, a novel wheel-side electric drive reducer hydraulic brake release control system is characterized in that: The output end of the accumulator (7) is connected to the input end of the zero leakage reversing valve (9), and the output end of the zero leakage reversing valve (9) is connected to the input end of the spring parking device (10). The spring parking device (10) is connected to the oil tank (1) through a pipeline, and a control valve is installed on the pipeline connecting the spring parking device (10) and the oil tank (1).

3. According to claim 1, a novel wheel-side electric drive reducer hydraulic brake release control system is characterized in that: A pressure switch (8) is installed on the pipeline connecting the zero-leakage reversing valve (9) and the spring parking device (10), and the pressure switch (8) is electrically connected to the travel motor (11) through the ECU.

4. According to claim 2, a new type of wheel-side electric drive reducer hydraulic brake release control system is characterized in that: A second one-way valve is installed on the pipeline connecting the spring parking device (10) and the zero-leakage reversing valve (9).

5. A novel wheel-side electric drive reducer hydraulic brake release control system according to any one of claims 1 to 4, characterized in that: The opening valve (12) is a relief valve, which is installed on the pipeline between the reversing valve (3) and the pressure reducing valve (5), and is electrically connected to the ECU.

6. A novel wheel-side electric drive reducer hydraulic brake release control system according to claim 5, characterized in that: The relief valve is a pilot electromagnetic relief valve, the P oil port of the pilot electromagnetic relief valve is connected to the pipeline between the oil pump (2) and the pressure reducing valve (5), the A oil port of the pilot electromagnetic relief valve is connected to the input end of the reversing valve (3), and the T oil port of the pilot electromagnetic relief valve is connected to the oil tank (1).

7. A novel wheel-side electric drive reducer hydraulic brake release control system according to any one of claims 1 to 4, characterized in that: The opening valve (12) is a back pressure valve, and the back pressure valve is installed on the reversing valve (3) between the pressure reducing valve (5) and the hydraulic cylinder (4).

8. A novel wheel-side electric drive reducer hydraulic brake release control system according to claim 7, characterized in that: The back pressure valve is installed on the pipeline between the reversing valve (3) and the oil tank (1).

9. A novel wheel-side electric drive reducer hydraulic brake release control system according to claim 7, characterized in that: The opening pressure of the back pressure valve is 2Mpa.

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