Low-power driven wet brake system

Abstract

The utility model discloses a low-power-driven wet brake system which comprises a double pump, a prefill valve, a brake valve, a drive axle, an energy accumulator and a hydraulic oil tank. The duplex pump comprises an oil pump I and an oil pump II; oil inlets of the first oil pump and the second oil pump are connected with the interior of the hydraulic oil tank, an oil outlet of the second oil pump is connected with a cooling oil inlet b1 and a cooling oil inlet b2 of the drive axle, an oil outlet of the first oil pump is connected with an oil inlet of the prefill valve, and a flushing oil port N of the prefill valve is connected with an oil outlet of the second oil pump and the cooling oil inlet b1 and the cooling oil inlet b2 of the drive axle. A liquid filling oil port S1 of the liquid filling valve is connected with the energy accumulator and an oil inlet P of the brake valve, an oil outlet A of the brake valve is connected with a brake oil port a1 and a brake oil port a2 of the drive axle, and an oil outlet c1 and an oil outlet c2 of the drive axle are communicated with the interior of the hydraulic oil tank. According to the utility model, the normal function can be realized, the load of a system power source can be effectively reduced, and the driving power is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of forklift brake systems, in particular to a low-power driven wet brake system. Background Art

[0002] The wet brake system of the forklift ensures the braking effect of the forklift. The reliability of its performance is directly related to the safety of the entire vehicle and is very important. On the one hand, the brake system needs to be filled for braking, that is, high-pressure hydraulic oil is accumulated in the accumulator to ensure that the system can provide sufficient pressure oil when braking is required; on the other hand, a large flow (relatively low oil pressure) of hydraulic oil is required to flow to the drive axle to flush and cool the drive axle and take the heat generated during braking out of the drive axle for cooling. The existing wet brake system usually uses an oil pump to switch the oil circuit of the valve body to perform these two tasks. Since the accumulator needs to be filled, the maximum pressure of the system is often relatively high; at the same time, it is necessary to ensure that the oil circuit switching can supply a large flow of oil when flushing and cooling the drive axle, which requires a large displacement of the oil pump. This causes the system's oil pump to generate a large load for a period of time (when the accumulator is filled), which requires the system to have a relatively large driving power. This requires the system's power source (such as an engine or electric motor, etc.) to have a large driving power, and high requirements for the system's power source. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a low-power driven wet brake system, which can not only ensure the normal function realization, but also effectively reduce the load of the system power source and reduce the driving power.

[0004] A low-power driven wet brake system according to the utility model comprises a double pump, a charging valve, a brake valve, a drive axle, an accumulator and a hydraulic oil tank;

[0005] The double pump comprises an oil pump 1 and an oil pump 2;

[0006] The oil inlets of the oil pump one and the oil pump two are connected to the interior of the hydraulic oil tank, the oil outlet of the oil pump two is connected to the cooling oil inlet b1 and the cooling oil inlet b2 of the drive axle, the oil outlet of the oil pump one is connected to the oil inlet of the charging valve, the flushing oil port N of the charging valve is respectively connected to the oil outlet of the oil pump two and the cooling oil inlet b1 and the cooling oil inlet b2 of the drive axle, the charging oil port S1 of the charging valve is respectively connected to the oil inlet P of the accumulator and the brake valve, the oil outlet A of the brake valve is connected to the brake oil port a1 and the brake oil port a2 of the drive axle, and the oil outlet c1 and the oil outlet c2 of the drive axle are connected to the interior of the hydraulic oil tank.

[0007] Preferably, a one-way valve is connected between the oil outlet of the second oil pump and the hydraulic oil tank to limit the oil outlet pressure of the second oil pump and the oil inlet pressure of the drive axle.

[0008] Preferably, a low-pressure alarm switch is installed at the oil inlet P of the brake valve, and a brake light switch is installed at the oil outlet A of the brake valve. The low-pressure alarm switch serves as a warning and is mainly used to detect the pressure of the hydraulic oil in the accumulator. The brake light switch is used to detect the opening and closing of the brake valve. The oil return port T of the brake valve is connected back to the hydraulic oil tank.

[0009] Preferably, a return oil filter is installed at the connection between the oil outlet c1 and the oil outlet c2 of the drive axle and the hydraulic oil tank to filter the oil returning from the drive axle.

[0010] Preferably, an oil suction filter 1 and an oil suction filter 2 are respectively installed at the connection between the oil inlets of the oil pump 1 and the oil pump 2 and the hydraulic oil tank to filter the oil entering the oil pump 1 and the oil pump 2.

[0011] Preferably, a respirator for communicating with the outside is installed at the upper end of the hydraulic oil tank to ensure the balance of air pressure inside and outside the hydraulic oil tank and to ensure the cleanliness of the air in the tank.

[0012] The beneficial effects of the utility model are:

[0013] The pipeline is simple and reliable, and the pipeline connection of the system is basically the same as that of existing technical products. The main difference is that the oil pump adopts a double pump, and there is a separate oil pump to flush and cool the front axle. It can effectively reduce the oil temperature of the hydraulic oil in the drive axle and improve the safety of the system;

[0014] The driving power of this system is relatively low. Since the displacement of the oil pump 1 connected to the oil inlet of the filling valve is no longer set larger due to the cooling requirements of the drive axle, the displacement of this pump can be set lower, which can greatly reduce the driving power of this part. At the same time, since the outlet of the oil pump 2 does not need to provide a large oil pressure, the driving power can also be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In the attached picture:

[0016] Figure 1 The present invention is a schematic structural diagram of a low-power driven wet brake system.

[0017] In the figure: 1. Dual pump; 2. Filling valve; 3. Brake valve; 4. Low pressure alarm switch; 5. Brake light switch; 6. Drive axle; 7. Accumulator; 8. Check valve; 9. Return oil filter; 10. Breathing apparatus; 11. Suction filter 1; 12. Suction filter 2; 13. Hydraulic oil tank; 1-1. Oil pump 1; 1-2. Oil pump 2. DETAILED DESCRIPTION

[0018] Reference Figure 1 , a low-power driven wet brake system, comprising a double pump 1, a charging valve 2, a brake valve 3, a drive axle 6, an accumulator 7 and a hydraulic oil tank 13;

[0019] The double pump 1 comprises an oil pump 1-1 and an oil pump 2 1-2;

[0020] The oil inlets of oil pump 1-1 and oil pump 2 1-2 are connected to the interior of the hydraulic oil tank 13 through a pipeline, the oil outlet of oil pump 2 1-2 is connected to the cooling oil inlet b1 and cooling oil inlet b2 of the drive axle 6 through a pipeline, the oil outlet of oil pump 1-1 is connected to the oil inlet of charging valve 2 through a pipeline, the flushing oil port N of charging valve 2 is respectively connected to the oil outlet of oil pump 2 1-2 and the cooling oil inlet b1 and cooling oil inlet b2 of the drive axle 6 through a pipeline, the charging oil port S1 of charging valve 2 is respectively connected to the accumulator 7 and the oil inlet P of brake valve 3 through a pipeline, the oil outlet A of brake valve 3 is connected to the brake oil port a1 and brake oil port a2 of the drive axle 6 through a pipeline, and the oil outlet c1 and oil outlet c2 of the drive axle 6 are connected to the interior of the hydraulic oil tank 13 through a pipeline.

[0021] In this embodiment, a one-way valve 8 is connected between the oil outlet of the oil pump 2 1 - 2 and the hydraulic oil tank 13 to limit the oil outlet pressure of the oil pump 2 and the oil inlet pressure of the drive axle.

[0022] In this embodiment, a low-pressure alarm switch 4 is installed at the oil inlet P of the brake valve 3, and a brake light switch 5 is installed at the oil outlet A of the brake valve 3. The low-pressure alarm switch serves as a warning and is mainly used to detect the pressure of the hydraulic oil in the accumulator. The brake light switch is used to detect the opening and closing of the brake valve. The oil return port T of the brake valve is connected back to the hydraulic oil tank.

[0023] In this embodiment, a return oil filter 9 is installed at the connection between the oil outlet c1 and the oil outlet c2 of the drive axle 6 and the hydraulic oil tank 13 to filter the oil returned from the drive axle.

[0024] In this embodiment, an oil suction filter 11 and an oil suction filter 2 12 are respectively installed at the connection between the oil inlet of the oil pump 1 1 - 1 and the oil pump 2 1 - 2 and the hydraulic oil tank 13 to filter the oil entering the oil pump 1 and the oil pump 2.

[0025] A respirator 10 for communicating with the outside is installed at the upper end of the hydraulic oil tank 13 in this embodiment to ensure the balance of air pressure inside and outside the hydraulic oil tank and the cleanliness of the air in the tank.

[0026] The cooling braking method of the wet brake system has the following steps:

[0027] In the initial state, the P port of the charging valve 2 is connected to the S1 port, and the hydraulic oil derived from the oil pump 1-1 will flow from the P and S1 ports of the charging valve 2 to the accumulator 7, and the high-pressure hydraulic oil will be stored in the accumulator 7. At this time, the P port of the brake valve 3 is disconnected from A and T.

[0028] When the valve core of the brake valve 3 moves and the P port of the brake valve 3 is connected to the A port, the high-pressure hydraulic oil in the accumulator 7 enters the brake oil port a1 and the brake oil port a2 of the drive axle through the brake valve 3 to implement braking;

[0029] The hydraulic oil derived from the oil pump 1-2 enters the drive axle 6 through the cooling oil inlet b1 and the cooling oil inlet b2 of the drive axle 6, and the hydraulic oil with a higher temperature therein is taken out through the oil outlet c1 and the oil outlet c2, and flows back to the hydraulic oil tank 13 through the return oil filter 9. When the oil outlet pressure of the oil pump 1-2 and the oil inlet pressure of the drive axle 6 exceed the set opening pressure of the one-way valve 8, the hydraulic oil derived from the oil pump 1-2 directly flows back to the hydraulic oil tank 13;

[0030] When the pressure of the hydraulic oil in the accumulator 7 reaches the pressure value set by the charging valve 2, the valve core in the charging valve 2 moves, and the P port of the charging valve 2 is connected to the N port. At this time, the hydraulic oil discharged by the oil pump 1-1 merges with the hydraulic oil discharged by the oil pump 2 1-2, and enters the cooling oil inlet b1 and the cooling oil inlet b2 of the drive axle 6 to cool the drive axle 6.

[0031] In summary, this system can not only ensure the braking of the entire vehicle, but also ensure the cooling of the drive axle. While ensuring the normal operation of the system, it can effectively reduce the load of the system power source and reduce the driving power.

Claims

1. A low-power driven wet brake system, characterized in that: It comprises a double pump (1), a charging valve (2), a brake valve (3), a drive axle (6), an accumulator (7) and a hydraulic oil tank (13); The double pump (1) comprises an oil pump 1 (1-1) and an oil pump 2 (1-2); The oil inlets of the oil pump 1 (1-1) and the oil pump 2 (1-2) are connected to the interior of the hydraulic oil tank (13); the oil outlet of the oil pump 2 (1-2) is connected to the cooling oil inlet b1 and the cooling oil inlet b2 of the drive axle (6); the oil outlet of the oil pump 1 (1-1) is connected to the oil inlet of the filling valve (2); the flushing oil port N of the filling valve (2) is respectively connected to the oil outlet of the oil pump 2 (1-2) and the cooling oil inlet b1 and the cooling oil inlet b2 of the drive axle (6); the filling oil port S1 of the filling valve (2) is respectively connected to the accumulator (7) and the oil inlet P of the brake valve (3); the oil outlet A of the brake valve (3) is connected to the brake oil port a1 and the brake oil port a2 of the drive axle (6); and the oil outlet c1 and the oil outlet c2 of the drive axle (6) are connected to the interior of the hydraulic oil tank (13).

2. A low-power driven wet brake system according to claim 1, characterized in that: A one-way valve (8) is connected between the oil outlet of the second oil pump (1-2) and the hydraulic oil tank (13).

3. A low-power driven wet brake system according to claim 1, characterized in that: A low-pressure alarm switch (4) is installed at the oil inlet P of the brake valve (3), and a brake light switch (5) is installed at the oil outlet A of the brake valve (3).

4. A low-power driven wet brake system according to claim 1, characterized in that: An oil return filter (9) is installed at the connection between the oil outlet c1 and the oil outlet c2 of the drive axle (6) and the hydraulic oil tank (13).

5. A low-power driven wet brake system according to claim 1, characterized in that: An oil suction filter 1 (11) and an oil suction filter 2 (12) are respectively installed at the connection points between the oil inlets of the oil pump 1 (1-1) and the oil pump 2 (1-2) and the hydraulic oil tank (13).

6. A low-power driven wet brake system according to claim 1, characterized in that: A respirator (10) for communicating with the outside world is installed at the upper end of the hydraulic oil tank (13).

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