Hydraulic power-assisted steering control rod of counterbalance forklift truck

Abstract

The utility model belongs to the technical field of hydraulic power assistance, and particularly discloses a hydraulic power-assisted steering control rod of a counterbalance forklift truck. The bottom end of the control rod is provided with a rotary valve, one side of the control rod is provided with a steering oil cylinder, two connecting pipes are arranged between the rotary valve and the steering oil cylinder, one side of the rotary valve is provided with two connectors, one side of the rotary valve is provided with a sealing box, and a throttling assembly is arranged in the sealing box and comprises two connecting cylinders; two discs are arranged in each of the two connecting cylinders, a driven gear is arranged between every two discs, a motor is arranged in the sealing box, the hydraulic assisting force can be accurately adjusted through the throttling assembly according to the working scene of the counterbalance forklift truck, when the counterbalance forklift truck is in full load or high-speed turning, the assisting force is enhanced, a driver can easily cope with large-resistance steering, and the driving safety is improved. And during no-load or low-speed driving, the assisting power is reduced, so that a driver can accurately control the steering angle, and the control hand feeling is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic power assistance, more particularly, to a hydraulic power assistance steering control lever of counterbalanced forklift. BACKGROUND

[0002] Hydraulic power assistance steering of counterbalanced forklift is a technology that relies on a hydraulic system to assist the driver in steering operation. The system uses a hydraulic pump to pressurize hydraulic oil, and through a series of hydraulic lines, control valves and other elements, the pressurized oil is delivered to the steering gear and steering cylinder. When the driver turns the steering wheel, the steering gear controls the flow direction and flow rate of the hydraulic oil according to the steering wheel's turning angle and direction, causing the steering cylinder to generate corresponding thrust or pull to push the steering wheels of the forklift to achieve steering action.

[0003] The existing control lever is difficult to meet the driver's demand for assistance size in different working scenarios, such as empty load, full load, high-speed driving or low-speed turning, when hydraulic power assistance steering is used, which may cause the forklift to be too sensitive in steering when empty or driving at high speed, making it difficult for the driver to accurately control the direction and easily causing safety accidents such as collisions. When fully loaded or turning at low speed, the assistance is insufficient, making the operation laborious, increasing the driver's fatigue, and reducing work efficiency. Long-term use will accelerate the wear of related parts of the forklift. CONTENT OF THE INVENTION

[0004] To solve the above problems, the present application provides a hydraulic power assistance steering control lever of counterbalanced forklift.

[0005] The hydraulic power assistance steering control lever of counterbalanced forklift provided by the present application adopts the following technical solution:

[0006] A hydraulic power assistance steering control lever of counterbalanced forklift, comprising a control lever, a rotary valve is arranged at the bottom end of the control lever, a steering cylinder is arranged on one side of the control lever, two connecting pipes are arranged between the rotary valve and the steering cylinder, two connectors are arranged on one side of the rotary valve, a sealing box is arranged on one side of the rotary valve, a throttling assembly is arranged inside the sealing box;

[0007] The throttling assembly comprises two connecting barrels, two discs are arranged inside each connecting barrel, a driven gear is arranged between each two discs, a motor is arranged inside the sealing box, and the motor is used to drive the two driven gears to adjust the hydraulic power size of the two connecting barrels.

[0008] Further, a through hole is formed on each side of each connecting barrel, each connecting barrel is connected to a corresponding connector through a corresponding through hole on one side, and each connecting barrel is connected to a corresponding connecting pipe through a corresponding through hole on the other side.

[0009] Further, each of the two discs is fixed to the inner wall of the corresponding connecting cylinder, each driven gear is located between the corresponding two discs, the inside of each disc is provided with a plurality of oil holes, the inside of each driven gear is provided with a fixed plate, the inside of each fixed plate is provided with a plurality of adjusting holes, and the structure of the plurality of oil holes is matched with the structure of the plurality of adjusting holes.

[0010] Further, the motor is fixedly installed on the inner wall of the sealing box, and the output end of the motor is fixedly connected with the driving gear, and the two driven gears are engaged with the driving gear.

[0011] Further, the two sides of each driven gear are provided with a limiting ring, and the side of each disc close to the corresponding driven gear is provided with a limiting groove, and each limiting ring is in sliding connection with the corresponding limiting groove.

[0012] Further, the two sides of each driven gear and the side of each limiting groove close to the corresponding driven gear are provided with a sealing pad, and the sealing pad is made of elastic material.

[0013] Through the above technical scheme, the size of the hydraulic assistance can be accurately adjusted according to the working scene of the counterbalanced forklift.

[0014] Further, the top end of the control rod is provided with a handle, and the handle is arranged in an arc shape.

[0015] Further, one side of the handle is provided with a control button, and the control button is in electrical connection with the motor.

[0016] Through the above technical scheme, hand fatigue can be effectively relieved, and the comfort and continuity of operation can be improved.

[0017] In summary, the present application has at least one of the following beneficial technical effects:

[0018] The throttle assembly can accurately adjust the size of the hydraulic assistance according to the working scene of the counterbalanced forklift, when fully loaded or high-speed turning, the increased assistance allows the driver to easily cope with large resistance steering, improves the operation fluency and safety; when empty or low-speed driving, the reduced assistance allows the driver to accurately control the steering angle, enhances the control feeling, through the adjustment of the motor drive, improves the comfort and flexibility of forklift control, reduces the labor intensity of the driver, significantly improves the forklift operation efficiency, reduces the operation errors and equipment wear caused by improper assistance, and prolongs the service life of the forklift. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole structure schematic view of the utility model;

[0020] Figure 2 It is a whole structure schematic view of the rotary valve and the sealing box of the utility model;

[0021] Figure 3 It is the internal structure schematic view of the sealing box of the utility model;

[0022] Figure 4 It is the internal structure schematic view of the connecting cylinder of the utility model;

[0023] Figure 5 It is the integral structure schematic view of the disc and the fixed plate of the utility model.

[0024] Mark 1, control lever; 2, rotary valve; 3, steering oil cylinder; 4, connecting pipe; 5, sealing box; 6, joint; 7, connecting cylinder; 8, through hole; 9, disc; 10, oil hole; 11, driven gear; 12, fixed plate; 13, control button; 14, adjusting hole; 15, limiting ring; 16, limiting groove; 17, driving gear; 18, motor; 19, handle. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments; based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] Referring to Figures 1-5 A hydraulic power steering control lever of a counterbalanced forklift, comprising a control lever 1, the bottom end of the control lever 1 is provided with a rotary valve 2, one side of the control lever 1 is provided with a steering oil cylinder 3, two connecting pipes 4 are arranged between the rotary valve 2 and the steering oil cylinder 3, two joints 6 are arranged on one side of the rotary valve 2, a sealing box 5 is arranged on one side of the rotary valve 2, and a throttling assembly is arranged in the sealing box 5.

[0027] The throttling assembly comprises two connecting cylinders 7, two discs 9 are arranged in the two connecting cylinders 7, a driven gear 11 is arranged between every two discs 9, a motor 18 is arranged in the sealing box 5, and the motor 18 is used to drive the two driven gears 11 to adjust the size of the hydraulic power of the two connecting cylinders 7.

[0028] Referring to Figures 1-5Each connecting cylinder 7 is provided with a through hole 8 on both sides, one side of each connecting cylinder 7 is communicated with the corresponding joint 6 through the corresponding through hole 8, the other side of each connecting cylinder 7 is communicated with the corresponding connecting pipe 4 through the corresponding through hole 8, each two discs 9 are fixed on the inner wall of the corresponding connecting cylinder 7, each driven gear 11 is located between the corresponding two discs 9, a plurality of oil holes 10 are formed in the interior of each disc 9, each driven gear 11 is provided with a fixed plate 12, a plurality of adjusting holes 14 are formed in the interior of each fixed plate 12, the structure of the plurality of oil holes 10 is matched with the structure of the plurality of adjusting holes 14, the motor 18 is fixedly installed on the inner wall of the sealing box 5, the output end of the motor 18 is fixedly connected with the driving gear 17, the two driven gears 11 are engaged with the driving gear 17, each driven gear 11 is provided with a limiting ring 15 on both sides, each disc 9 is provided with a limiting groove 16 on the side close to the corresponding driven gear 11, each limiting ring 15 is slidably connected with the corresponding limiting groove 16, and each driven gear 11 is provided with a sealing pad on both sides and on the side of each limiting groove 16 close to the corresponding driven gear 11. The sealing pad is made of elastic material.

[0029] The throttle assembly can adjust the hydraulic assistance size according to different working scenes to meet the needs of the driver. Specifically, when the hydraulic assistance size needs to be adjusted, the motor 18 in the sealing box 5 is started through the control button 13, the output end of the motor 18 drives the driving gear 17 to rotate, since the two driven gears 11 are engaged with the driving gear 17, the two driven gears 11 are driven to rotate synchronously, when the driven gears 11 rotate, the limiting rings 15 on both sides slide in the limiting grooves 16 of the corresponding discs 9 to ensure the stability of rotation, as the driven gears 11 rotate, the coincidence degree of the adjusting holes 14 on the fixed plates 12 and the oil holes 10 on the discs 9 changes, for example, when the forklift is full load or high-speed turning and other conditions requiring large assistance, the motor 18 drives the driven gears 11 to rotate, so that the overlapping area of the adjusting holes 14 and the oil holes 10 increases, the flow of hydraulic oil from the joint 6 to the connecting pipe 4 through the through hole 8 of the connecting cylinder 7, the oil hole 10 of the disc 9, the adjusting hole 14, and the oil hole 10 of the other disc 9 and the through hole 8 of the connecting cylinder 7 increases, and the assistance is increased; conversely, in the condition of empty load or low-speed driving and other conditions requiring small assistance, the motor 18 is reversed or rotated by a certain angle, so that the overlapping area of the adjusting holes 14 and the oil holes 10 decreases, the hydraulic oil flow is reduced, and the assistance is reduced, so as to meet the needs of the driver for the assistance size in different working scenes.

[0030] The throttle assembly can accurately adjust the hydraulic assistance according to the working scene of the counterbalanced forklift. When fully loaded or high-speed turning, the increased assistance allows the driver to easily cope with large resistance steering, improving the operation fluency and safety. When empty or low-speed driving, the reduced assistance allows the driver to accurately control the steering angle, enhancing the steering feel, and improving the comfort and flexibility of the forklift control through the adjustment of the motor 18, reducing the labor intensity of the driver, significantly improving the forklift operation efficiency, reducing operation errors and equipment damage caused by inappropriate assistance, and prolonging the service life of the forklift.

[0031] Referring to Figure 1 The top end of the control lever 1 is provided with a handle 19, which is arc-shaped. One side of the handle 19 is provided with a control button 13, which is electrically connected with the motor 18.

[0032] The arc-shaped handle 19 allows the driver to naturally and comfortably hold the handle during long-time operation, effectively relieving hand fatigue and improving the comfort and continuity of operation. The electrical connection between the control button 13 and the motor 18 facilitates the operation of the driver.

[0033] Working principle: when the hydraulic assistance needs to be adjusted, the motor 18 in the sealed box 5 is started through the control button 13. The output end of the motor 18 drives the driving gear 17 to rotate. Since the two driven gears 11 are engaged with the driving gear 17, the two driven gears 11 are driven to rotate synchronously. When the driven gear 11 rotates, the limiting rings 15 on both sides thereof slide in the limiting grooves 16 of the corresponding discs 9, ensuring the stability of rotation. As the driven gear 11 rotates, the coincidence degree of the adjustment holes 14 on the fixed plates 12 inside the driven gear 11 and the oil holes 10 on the discs 9 changes. For example, when the forklift is fully loaded or high-speed turning, etc., which requires large assistance, the motor 18 drives the driven gear 11 to rotate, so that the overlapping area of the adjustment holes 14 and the oil holes 10 increases. The flow of hydraulic oil from the joint 6 to the connecting pipe 4 through the through hole 8 of the connecting cylinder 7, the oil hole 10 of the disc 9, the adjustment hole 14, and the oil hole 10 of the other disc 9 and the through hole 8 of the connecting cylinder 7 increases, realizing the increase of assistance. Conversely, in the empty or low-speed driving scene, etc., which requires small assistance, the motor 18 reverses or rotates by a certain angle, so that the overlapping area of the adjustment holes 14 and the oil holes 10 decreases, reducing the flow of hydraulic oil, thereby reducing the assistance, to meet the needs of the driver for the size of the assistance in different working scenes.

[0034] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape, and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A hydraulic power steering lever for a counterbalance forklift, comprising a lever (1), characterized in that, The bottom end of the control lever (1) is provided with a rotary valve (2), and a steering cylinder (3) is provided on one side of the control lever (1). Two connecting pipes (4) are provided between the rotary valve (2) and the steering cylinder (3). Two connectors (6) are provided on one side of the rotary valve (2). A sealing box (5) is provided on one side of the rotary valve (2). A throttling component is provided inside the sealing box (5). The throttling assembly includes two connecting cylinders (7), each of which has two discs (9) inside. A driven gear (11) is provided between each pair of discs (9). A motor (18) is provided inside the sealing box (5). The motor (18) is used to drive the two driven gears (11) to adjust the hydraulic assist of the two connecting cylinders (7).

2. The hydraulic power steering lever of a counterbalance forklift according to claim 1, characterized in that: Each of the connecting cylinders (7) has through holes (8) on both sides. One side of each connecting cylinder (7) is connected to the corresponding connector (6) through the corresponding through hole (8), and the other side of each connecting cylinder (7) is connected to the corresponding connecting pipe (4) through the corresponding through hole (8).

3. The hydraulic power steering lever of a counterbalance forklift according to claim 2, characterized in that: Each pair of discs (9) is fixed to the inner wall of the corresponding connecting cylinder (7). Each driven gear (11) is located between the two corresponding discs (9). Each disc (9) has multiple oil holes (10) inside. Each driven gear (11) has a fixing plate (12) inside. Each fixing plate (12) has multiple adjusting holes (14) inside. The structure of the multiple oil holes (10) is adapted to the structure of the multiple adjusting holes (14).

4. The hydraulic power steering lever of a counterbalance forklift according to claim 3, characterized in that: The motor (18) is fixedly installed on the inner wall of the sealed box (5). The output end of the motor (18) is fixedly connected to the drive gear (17), and the two driven gears (11) mesh with the drive gear (17).

5. The hydraulic power steering lever of a counterbalance forklift according to claim 4, characterized in that: Each driven gear (11) has a limiting ring (15) on both sides, and each disk (9) has a limiting groove (16) on the side close to the corresponding driven gear (11). Each limiting ring (15) is slidably connected to the corresponding limiting groove (16).

6. The hydraulic power steering lever of a counterbalance forklift according to claim 5, characterized in that: Each of the driven gears (11) has a sealing gasket on both sides and on the side of each limiting groove (16) near the corresponding driven gear (11), the sealing gasket being made of an elastic material.

7. The hydraulic power steering lever of a counterbalance forklift according to claim 1, characterized in that: The top of the control lever (1) is provided with a handle (19), which is arc-shaped.

8. The hydraulic power steering lever of a counterbalance forklift according to claim 7, characterized in that: A control button (13) is provided on one side of the handle (19), and the control button (13) is electrically connected to the motor (18).

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