A hydraulic powertrain for a forklift and the forklift itself

Abstract

This utility model discloses a hydraulic powertrain for a forklift, including a brushless DC motor, a valve block, and a hydraulic oil tank. The valve block is fixedly mounted on the upper end of the hydraulic oil tank, and the brushless DC motor is fixedly mounted on the valve block. A gear pump is mounted on the top of the hydraulic oil tank, and the gear pump is fixedly mounted on the lower end of the valve block. A solenoid valve is mounted on the left end of the valve block, and an oil outlet and an overflow valve are mounted on the front end face of the valve block. An oil suction pipe extending into the hydraulic oil tank is mounted on the lower end of the gear pump. This utility model's hydraulic powertrain for the forklift replaces the original brushed motor with a brushless DC motor, achieving maintenance-free operation, long service life, high energy conversion efficiency, low noise, and the ability to charge the battery when the forklift forks are lowered, thus featuring energy recovery functionality.

Description

Technical Field

[0001] This utility model relates to the field of cargo transportation equipment, and in particular to a hydraulic power assembly for a forklift. Background Technology

[0002] Currently, most electric forklifts on the market use brushed DC motors in their hydraulic powertrains, consisting of components such as valve blocks, hydraulic pumps, relief valves, solenoid valves, hydraulic oil tanks, and contactors (or high-power relays). Brushed motors, due to their carbon brushes and commutators, experience wear and tear over time, requiring periodic replacement. Furthermore, they have low energy conversion efficiency, generate significant heat, have short lifespans, poor high-speed performance, large torque fluctuations, and high operating noise. Additionally, they lack energy recovery functionality when the forklift forks are moving up and down. Therefore, developing a new type of hydraulic powertrain for forklifts is a pressing issue for those skilled in the art. Utility Model Content

[0003] The purpose of this invention is to provide a hydraulic powertrain for forklifts, which solves the problem that most existing hydraulic powertrains use brushed DC motors, which cause wear and tear on carbon brushes and commutators over long-term use, requiring periodic replacement.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model discloses a hydraulic powertrain for a forklift, comprising a brushless DC motor, a valve block, and a hydraulic oil tank. The valve block is fixedly mounted on the upper end of the hydraulic oil tank, and the brushless DC motor is fixedly mounted on the valve block. A gear pump is mounted on the top of the hydraulic oil tank, and the gear pump is fixedly mounted on the lower end of the valve block. A solenoid valve is mounted on the left end of the valve block, and an oil outlet and an overflow valve are mounted on the front end face of the valve block. An oil suction pipe extending into the hydraulic oil tank is mounted on the lower end of the gear pump.

[0005] Furthermore, a filter is provided at the bottom end of the oil suction pipe.

[0006] Furthermore, the output shaft of the brushless DC motor is connected to the input shaft of the gear pump.

[0007] Furthermore, the top of the hydraulic oil tank is equipped with a connector and a filling vent plug.

[0008] Furthermore, the gear pump and the valve block are connected by a first bolt.

[0009] Furthermore, an O-ring is provided between the valve block and the hydraulic oil tank, and the valve block and the hydraulic oil tank are connected by a second bolt and a washer.

[0010] Furthermore, an encoder is provided at the top of the brushless DC motor, and the brushless DC motor and the encoder are electrically connected to the controller.

[0011] Furthermore, the hydraulic oil tank is equipped with a drain pipe connected to the overflow valve.

[0012] A forklift, including a hydraulic powertrain for the forklift.

[0013] Compared with the prior art, the beneficial technical effects of this utility model are as follows: This utility model forklift's hydraulic powertrain replaces the original brushed motor with a brushless DC motor, achieving maintenance-free operation, long service life, high energy conversion efficiency, and low noise. Furthermore, it can charge the battery when the forklift forks are lowered, featuring energy recovery functionality. In summary, this utility model forklift's hydraulic powertrain has a simple structure, ingenious design, and practical function, effectively solving the problem that most existing hydraulic powertrains use brushed DC motors, which cause wear and tear on carbon brushes and commutators over long-term use, requiring periodic replacement. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is an isometric drawing of the hydraulic powertrain of the forklift according to this utility model; Figure 2 This is a front view of the hydraulic power assembly of the forklift of this utility model; Figure 3 This is a left view of the hydraulic power assembly of the forklift of this utility model; Figure 4 This is a top view of the hydraulic power assembly of the forklift of this utility model; Figure 5 for Figure 2 AA section view.

[0015] Explanation of reference numerals in the attached diagram: 1. Brushless DC motor; 2. Valve block; 3. Solenoid valve; 4. Relief valve; 5. Hydraulic oil tank; 6. Suction pipe; 7. Filter; 8. Gear pump; 9. Drain pipe; 10. First bolt; 11. O-ring; 12. Second bolt; 13. Gasket; 14. Filler vent plug; 15. Connector; 16. Encoder; 17. Oil outlet. Detailed Implementation

[0016] like Figures 1 to 5 As shown, a hydraulic powertrain for a forklift includes a brushless DC motor 1, a valve block 2, and a hydraulic oil tank 5. The valve block 2 is fixedly mounted on the upper end of the hydraulic oil tank 5, and an O-ring 11 is provided between the valve block 2 and the hydraulic oil tank 5. The valve block 2 and the hydraulic oil tank 5 are connected by a second bolt 12 and a washer 13.

[0017] The brushless DC motor 1 is fixedly mounted on the valve block 2; a gear pump 8 is provided at the top of the hydraulic oil tank 5, and the output shaft of the brushless DC motor 1 is connected to the input shaft of the gear pump 8.

[0018] The gear pump 8 is fixedly mounted at the lower end of the valve block 2, and the gear pump 8 is connected to the valve block 2 by the first bolt 10. A solenoid valve 3 is provided at the left end of the valve block 2, and an oil outlet 17 and an overflow valve 4 are provided on the front end face of the valve block 2.

[0019] The lower end of the gear pump 8 is provided with an oil suction pipe 6 extending into the hydraulic oil tank 5. A filter 7 is provided at the bottom end of the oil suction pipe 6.

[0020] The top of the hydraulic oil tank 5 is provided with a connector 15 and an oil filling and vent plug 14.

[0021] An encoder 16 is provided at the top of the brushless DC motor 1, and the brushless DC motor 1 and the encoder 16 are electrically connected to the controller.

[0022] The hydraulic oil tank 5 is equipped with a drain pipe 9 connected to the overflow valve 4.

[0023] The working principle of this utility model is as follows: The brushless DC motor 1 and the valve block 2 are connected as one unit. The output shaft of the brushless DC motor 1 is connected to the input shaft of the gear pump 8. The gear pump 8 and the valve block 2 are connected by the first bolt 10. The gear pump 8 is equipped with an oil suction pipe 6, and the bottom end of the oil suction pipe 6 is equipped with a filter 7. The valve block 2 is equipped with a solenoid valve 3, an overflow valve 4, and an oil drain pipe 9. The hydraulic oil tank 5 is equipped with an oil filling vent plug 14 and a connector 15. The connector 15 is generally used for air venting or oil return. The valve block 2 and the hydraulic oil tank 5 are sealed by an O-ring 11 and connected by a second bolt 12 and a gasket 13. The brushless DC motor 1, the encoder 16 (or Hall sensor), and the controller are connected by power lines and data lines.

[0024] The controller controls the rotation and start / stop of the brushless DC motor 1, and the rotation of the motor drives the gear pump 8 to rotate. When rotating forward, hydraulic oil enters valve block 2 through suction pipe 6, solenoid valve 3 is not energized, and high-pressure oil generated by gear pump 8 is connected to the lifting cylinder of forklift through oil outlet 17 to lift the goods; when the goods are lowered, solenoid valve 3 is energized, and hydraulic oil in lifting cylinder returns to valve block 2 along the original path. Gear pump 8 drives motor to reverse, and motor generates induced current to charge battery, realizing energy recovery function.

[0025] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A hydraulic powertrain for a forklift, characterized in that: The device includes a brushless DC motor (1), a valve block (2), and a hydraulic oil tank (5). The valve block (2) is fixedly installed at the upper end of the hydraulic oil tank (5), and the brushless DC motor (1) is fixedly installed on the valve block (2). A gear pump (8) is installed at the top of the hydraulic oil tank (5), and the gear pump (8) is fixedly installed at the lower end of the valve block (2). A solenoid valve (3) is installed at the left end of the valve block (2), and an oil outlet (17) and an overflow valve (4) are installed on the front end face of the valve block (2). An oil suction pipe (6) extending into the hydraulic oil tank (5) is installed at the lower end of the gear pump (8).

2. The hydraulic powertrain of the forklift according to claim 1, characterized in that: A filter (7) is provided at the bottom of the oil suction pipe (6).

3. The hydraulic powertrain of the forklift according to claim 1, characterized in that: The output shaft of the brushless DC motor (1) is connected to the input shaft of the gear pump (8).

4. The hydraulic powertrain of the forklift according to claim 1, characterized in that: The top of the hydraulic oil tank (5) is provided with a connector (15) and an oil filling vent plug (14).

5. The hydraulic powertrain of the forklift according to claim 1, characterized in that: The gear pump (8) is connected to the valve block (2) by a first bolt (10).

6. The hydraulic powertrain of the forklift according to claim 1, characterized in that: An O-ring (11) is provided between the valve block (2) and the hydraulic oil tank (5), and the valve block (2) and the hydraulic oil tank (5) are connected by a second bolt (12) and a gasket (13).

7. The hydraulic powertrain of the forklift according to claim 1, characterized in that: An encoder (16) is provided at the top of the brushless DC motor (1), and the brushless DC motor (1) and the encoder (16) are electrically connected to the controller.

8. The hydraulic powertrain of the forklift according to claim 1, characterized in that: The hydraulic oil tank (5) is equipped with a drain pipe (9) connected to the overflow valve (4).

9. A forklift, characterized in that: The hydraulic powertrain of the forklift as described in any one of claims 1 to 8.

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