A composite automobile hydraulic steering assistance protection system

Abstract

The present invention discloses a composite automobile hydraulic power steering protection system, including an oil tank, a power pump, a steering valve and a steering power cylinder. The oil tank is connected to the power pump, and the output end of the power pump is connected to the steering valve via an oil inlet pipe. The steering valve is also connected to the oil tank via an oil return pipe. The oil inlet pipe and the oil return pipe are connected via a pressure relief pipe, and an overflow valve is arranged on the pressure relief pipe; the oil inlet pipe is also connected to the oil tank via a spare pipe, and a one-way valve is arranged on the spare pipe, and the one-way valve is conducted toward the direction of the oil inlet pipe. The present invention adopts the composite automobile hydraulic power steering protection system of the above structure, and by arranging an overflow valve, it is used to solve the problem that when the steering wheel of the automobile is in an extreme state and the steering wheel keeps applying force in the same direction and the engine keeps running at a high speed during use, the power steering hydraulic system is protected from being damaged; at the same time, when the hydraulic pump of the power steering hydraulic system is damaged or the oil inlet line is blocked, the one-way valve is used to eliminate the dead stagnation when the driving wheel is turned.

Description

Technical Field

[0001] The invention relates to an automobile component technology, in particular to a composite automobile hydraulic steering power-assist protection system. Background Art

[0002] At present, in the design of automobile steering systems, hydraulic systems are widely used to achieve the steering power function, that is, the hydraulic pump (boost pump) drives the hydraulic oil to provide power, and the hydraulic pump is directly driven by the engine. Specifically, the hydraulic power mechanism inside the automobile steering gear is a hydraulic cylinder structure, and the piston in the hydraulic cylinder is connected to the automobile steering wheel through a connecting rod mechanism. When the car needs to turn, while turning the steering wheel, the valve group of the hydraulic system is controlled to connect the pressure oil to one side of the piston chamber in the hydraulic cylinder, and the other side is connected to the oil tank of the hydraulic system at the same time. The pressure oil pushes the piston and drives the wheel through the connecting rod mechanism to achieve the steering function.

[0003] Under this structure, when the car's steering wheel is in the steering limit position and the steering wheel is kept under force in the same direction, the hydraulic oil inlet path on the steering gear side is in a closed state, but the hydraulic pump is still operating normally because it is directly driven by the car engine. When the engine is running at high speed, the power steering pump rotor also runs at high speed. At this time, since the steering gear oil inlet is in a closed state, the hydraulic oil cannot form a circulation state in the hydraulic system pipeline, resulting in the hydraulic oil in the power steering pump cavity being driven by the power steering pump rotor impeller to form a high-speed microcirculation in the pump housing. The hydraulic oil rubs against the inner wall of the pump body at a high speed, and the oil temperature rises rapidly, resulting in the hydraulic oil temperature being too high. However, since the sealing material used on the sealing surface of the pump housing is made of rubber, it cannot withstand excessively high temperatures. The sealing material is damaged, and the hydraulic power steering pump immediately leaks and other damages occur, and the power steering system fails.

[0004] When the power steering hydraulic system cannot provide steering assistance in an application scenario, the car still has the ability to steer. At this time, because the hydraulic system cannot provide assistance, the driver needs to turn the steering wheel with greater force to directly drive the piston in the steering gear to move through the connecting mechanism. However, when the hydraulic pump of the car's hydraulic power steering system is damaged or the hydraulic system's oil inlet line is blocked, the hydraulic oil cannot be added to the steering gear's piston cavity. The cavity in the steering gear's piston cylinder that needs to be filled with oil will form a vacuum state. Due to the effect of atmospheric pressure, the piston cannot move, the wheels will stagnate during steering operations, and the vehicle will lose its steering ability. Summary of the invention

[0005] The purpose of the present invention is to provide a composite automobile hydraulic steering power protection system. When the automobile engine keeps running at high speed, the steering wheel is in an extreme state and the steering wheel keeps applying force in the same direction, an overflow valve is arranged in the device to keep the oil pressure of the system within a normal range, so as to avoid the system from having too high a power pump temperature due to excessive pressure, thereby solving the problem of damage to the hydraulic power system; at the same time, when the steering power hydraulic system has application scenarios such as hydraulic pump damage or oil inlet pipeline block block, a one-way valve is arranged between the oil inlet and return oil passages inside the integrated oil circuit block to connect the oil circuit between the oil tank and the steering gear piston oil inlet chamber, thereby eliminating the steering deadlock phenomenon of the steering wheel.

[0006] To achieve the above-mentioned object, the present invention provides a composite automobile hydraulic steering power protection system, comprising an oil tank, a power pump, a steering valve and a steering power cylinder connected to the steering valve, wherein the oil tank is connected to the input end of the power pump via a first oil pipe, the output end of the power pump is connected to the steering valve via an oil inlet pipe, the steering valve is also connected to the oil tank via an oil return pipe, the oil inlet pipe and the oil return pipe are connected via a pressure relief pipe, and a relief valve is provided on the pressure relief pipe;

[0007] The oil inlet pipe is also connected to the oil tank via a spare pipe. A one-way valve is provided on the spare pipe, and the one-way valve is connected toward the direction of the oil inlet pipe.

[0008] Preferably, the oil inlet pipe, the oil return pipe, the standby pipe and the pressure relief pipe are all arranged inside the integrated oil circuit block.

[0009] Preferably, one end of the oil inlet pipe and one end of the oil return pipe are threadedly connected to the outer shell of the steering valve after passing through the through hole opened in the integrated oil circuit block, and the other end of the oil inlet pipe and the other end of the oil return pipe are crimped to the end face of the integrated oil circuit block by bolts.

[0010] Preferably, a sealing ring is sleeved on one end of the oil inlet pipe close to the bolt, and the oil inlet pipe is sealed with the end face of the integrated oil circuit block via the sealing ring.

[0011] Preferably, a plurality of sealing grooves are provided on the outer wall of the oil return pipe, and sealing rings are provided in the sealing grooves, so that the outer side of the oil return pipe is radially sealed with the inner wall of the through hole provided in the integrated oil circuit block.

[0012] Preferably, the oil inlet pipe and the bolt, as well as the oil return pipe and the bolt are all integrally formed structures.

[0013] Preferably, oil guide holes are provided on the side walls of the oil inlet pipe and the side walls of the oil outlet pipe, and the oil guide holes on the oil inlet pipe and the oil guide holes on the oil outlet pipe are connected via the pressure relief pipe provided inside the integrated oil circuit block.

[0014] Preferably, the sealing ring is an O-ring.

[0015] Therefore, the present invention adopts the composite automobile hydraulic steering assistance protection system with the above structure, and sets a relief valve to solve the problem that when the automobile is in use, the steering wheel is in an extreme state, the steering wheel maintains force in the same direction, and the engine maintains high-speed operation, the steering assistance hydraulic system is protected from damage; at the same time, when the hydraulic pump of the steering assistance hydraulic system is damaged or the oil inlet line is blocked, the one-way valve is used to eliminate the dead stagnation when the driving wheel is turned.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an oil flow diagram of a composite automobile hydraulic steering power protection system during normal operation according to an embodiment of the present invention;

[0018] Figure 2 This is a flow diagram of an application scenario 1 of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention;

[0019] Figure 3 This is a flow diagram when the second application scenario of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention occurs;

[0020] Figure 4 This is an overall schematic diagram of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the oil inlet pipe structure of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the oil outlet pipe structure of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention;

[0023] Figure 7 The present invention is a schematic diagram of an integrated oil circuit block structure of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention.

[0024] Among them: 1. Oil tank; 2. First oil pipe; 3. Power booster pump; 4. Oil inlet pipe; 5. Oil return pipe; 6. Integrated oil circuit block; 7. Overflow valve; 8. Check valve; 9. Steering valve; 10. Oil guide hole; 11. Sealing groove; 12. Through hole. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0026] Figure 1 This is an oil flow diagram of a composite automobile hydraulic steering power protection system during normal operation according to an embodiment of the present invention; Figure 2 This is a flow diagram of an application scenario 1 of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention; Figure 3 This is a flow diagram when the second application scenario of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention occurs; Figure 4 This is an overall schematic diagram of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the oil inlet pipe structure of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the oil outlet pipe structure of a composite automobile hydraulic steering assistance protection system according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the integrated oil circuit block structure of a composite automobile hydraulic steering power protection system according to an embodiment of the present invention. As shown in the figure, the structure of the present invention includes an oil tank 1, a power pump 3, a steering valve 9 and a steering power cylinder connected to the steering valve 9. The oil tank 1 is connected to the input end of the power pump 3 through the first oil pipe 2, and the output end of the power pump 3 is connected to the steering valve 9 through the oil inlet pipe 4. The steering valve 9 is also connected to the oil tank 1 through the return oil pipe 5. The oil inlet pipe 4 and the return oil pipe 5 are connected through a pressure relief pipe. A relief valve 7 is provided on the pressure relief pipe. The rated pressure of the relief valve 7 in this embodiment is set to 7.5MP. The oil inlet pipe 4 is also connected to the oil tank 1 through a spare pipe. A check valve 8 is provided on the spare pipe. The check valve 8 is conducted toward the direction of the oil inlet pipe 4.

[0027] When the application scenario 1 occurs, that is, when the steering wheel of the car is at the extreme position and the steering wheel maintains the same direction of force, the hydraulic oil circuit flowing through the steering valve 9 is in a closed state. However, due to the high-speed operation of the engine, the oil pressure of the hydraulic system will increase. When it exceeds the rated pressure value set by the relief valve 7, the hydraulic oil enters the pressure relief pipe inside the integrated oil circuit block 6 through the leakage hole of the relief valve 7, and the pressure relief pipe flows back to the oil tank through the return oil pipe 5. Thus, the system pressure is kept constant, preventing the car power pump from overloading, thereby avoiding damage to the hydraulic system components such as the power pump 3; because the inlet and outlet of the one-way valve are respectively connected to the low and high pressure sides of the oil circuit block, in this application scenario, the one-way valve 8 is in a closed state under the action of the oil pressure, which does not affect the normal function of this application scenario.

[0028] When the second application scenario occurs, that is, if the vehicle is in a driving state and the power-assisting pump 3 is damaged or the hydraulic pipeline is blocked, the power-assisting hydraulic system loses pressure and the wheel steering power-assisting function fails, but at this time the steering wheel must still have the steering control capability to enable the driver to control the vehicle to a safe state. At this time, the driver needs to use a large force to drive the vehicle steering wheel to drive the steering gear to drive the steering wheel to turn. At the same time, the piston in the steering valve 9 moves axially. In order to solve the problem that the hydraulic oil cannot enter the driving piston chamber of the steering valve 9 through the oil inlet pipeline due to pipeline blockage, the hydraulic oil in the oil tank 1 enters the oil inlet pipe 4 (low pressure) through the first oil pipe 2 (high pressure) and the one-way valve. Since the inlet and outlet sides of the one-way valve are connected to the low-pressure and high-pressure oil channels respectively, the one-way valve is turned on under the action of the oil pressure difference on both sides and enters the driving side of the piston chamber in the steering valve 9, avoiding the vacuum state formed in the driving chamber by the movement of the piston of the steering valve 9. Then, the piston inside the steering valve 9 can move under the drive of the steering wheel to drive the wheel to turn, realize the normal steering function of the wheel, and avoid the dead stagnation of the wheel steering.

[0029] That is, when the power pump 3 is damaged or the hydraulic pipeline is blocked, if the steering wheel is turned to drive the wheel to steer, the hydraulic oil will enter the oil inlet pipe 4 from the oil tank 1 through the one-way valve 8, and then enter the steering valve 9, thereby replenishing the vacuum chamber formed by the movement of the piston in the steering power cylinder. Then, the steering power cylinder piston can move under the drive of the steering wheel, drive the wheel to steer, realize the normal steering function of the wheel, and avoid the wheel steering stagnation phenomenon.

[0030] Specifically, the oil inlet pipe 4, the oil return pipe 5, the standby pipe and the pressure relief pipe are all arranged inside the integrated oil circuit block 6. One end of the oil inlet pipe 4 and one end of the oil return pipe 5 are both threadedly connected to the outer shell of the steering valve 9 after passing through the through hole 12 provided in the integrated oil circuit block 6, that is, the end of the oil inlet pipe 4 close to the steering valve 9 is provided with an external thread, and the corresponding outer shell of the steering valve 9 is provided with an internal thread, so that the oil inlet pipe 4 is threadedly connected to the inner thread of the outer shell of the steering valve 9 after passing through the integrated oil circuit block 6, and the other end of the oil inlet pipe 4 and the other end of the oil return pipe 5 are crimped with the end face of the integrated oil circuit block 6 by bolts, that is, the oil inlet pipe 4 and the oil return pipe 5 not only play the role of connecting the oil circuit, but also play the role of connecting the components. The system is directly fixed on the steering valve 9 through the integrated oil circuit block 6, and an integrated oil circuit block with an oil inlet pipe 4, an oil return pipe 5, a through hole, a relief valve 7 and a one-way valve 8 is installed on the basis of the original vehicle. When the steering wheel is in the extreme state and the steering wheel keeps applying force in the same direction and the engine keeps running at a high speed, the steering power hydraulic system is protected from damage. At the same time, when the hydraulic pump of the steering power hydraulic system is damaged or the oil inlet line is blocked, the one-way valve is used to eliminate the dead stagnation when the driving wheel is turned, which is convenient for modification and installation.

[0031] Preferably, a sealing ring is sleeved on one end of the oil inlet pipe 4 near the bolt, and the oil inlet pipe 4 is sealed with the end face of the integrated oil circuit block 6 through the sealing ring. A plurality of sealing grooves 11 are provided on the outer wall of the oil return pipe 5, and sealing rings are provided in the sealing grooves 11, so that the outer side of the oil return pipe 5 is radially sealed with the inner wall of the through hole 12 provided in the integrated oil circuit block 6. Preferably, the sealing ring is an O-type rubber ring.

[0032] Preferably, the oil inlet pipe 4 and the bolts as well as the oil return pipe 5 and the bolts are all integrally formed. Preferably, oil guide holes 10 are provided on the side walls of the oil inlet pipe 4 and the side walls of the oil outlet pipe (four oil guide holes 10 are provided on the side along the circumferential direction), and the oil guide holes 10 on the oil inlet pipe 4 and the oil guide holes 10 on the oil outlet pipe are connected via a pressure relief pipe provided inside the integrated oil circuit block 6.

[0033] That is, the oil inlet pipe 4 (high-pressure pipe) of the power-assisting pump 3 is connected to the oil inlet port (high pressure) of the steering valve 9, and the oil outlet port (low pressure) of the steering valve 9 is connected to the oil tank through the return oil pipe 5 (low-pressure pipe). At the same time, the oil inlet pipe 4 is radially provided with an oil guide hole 10 which is connected to the return oil pipe 5 arranged inside the integrated oil circuit block.

[0034] The integrated oil circuit block 6 in this embodiment is provided with a high-pressure passage (through hole for the oil inlet pipe 4) and a low-pressure passage (through hole for the oil return pipe 5), and two mounting holes (for mounting the relief valve 7 and the check valve 8). The high-pressure side and the pressure-relief side of the relief valve are respectively connected to the high-pressure and low-pressure oil circuit channels inside the integrated oil circuit block, and the oil inlet and outlet ports of the check valve are respectively connected to the low-pressure and high-pressure oil circuit channels inside the integrated oil circuit block, and the check valve is conducted toward the direction of the high-pressure oil circuit channel.

[0035] Therefore, the present invention adopts the composite automobile hydraulic steering assistance protection system with the above structure, and sets a relief valve to solve the problem that when the automobile is in use, the steering wheel is in an extreme state, the steering wheel maintains force in the same direction, and the engine maintains high-speed operation, the steering assistance hydraulic system is protected from damage; at the same time, when the hydraulic pump of the steering assistance hydraulic system is damaged or the oil inlet line is blocked, the one-way valve is used to eliminate the dead stagnation when the driving wheel is turned.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A composite automobile hydraulic steering power protection system, comprising a fuel tank, a power pump, a steering valve and a steering power cylinder connected to the steering valve, wherein the fuel tank is connected to the input end of the power pump via a first oil pipe, the output end of the power pump is connected to the steering valve via an oil inlet pipe, and the steering valve is also connected to the fuel tank via an oil return pipe, characterized in that: The oil inlet pipe and the oil return pipe are connected via a pressure relief pipe, and a relief valve is provided on the pressure relief pipe; The oil inlet pipe is also connected to the oil tank via a spare pipe, and a one-way valve is provided on the spare pipe, and the one-way valve is connected toward the direction of the oil inlet pipe; The oil inlet pipe, the oil return pipe, the standby pipe and the pressure relief pipe are all arranged inside the integrated oil circuit block; One end of the oil inlet pipe and one end of the oil return pipe are threadedly connected to the housing of the steering valve after passing through the through hole opened in the integrated oil circuit block, and the other end of the oil inlet pipe and the other end of the oil return pipe are crimped to the end face of the integrated oil circuit block by bolts; When the first application scenario occurs, that is, when the steering wheel of the car is at the extreme position and the steering wheel maintains the same direction of force, the hydraulic oil circuit flowing through the steering valve is in a closed state. However, due to the high-speed operation of the engine, the oil pressure of the hydraulic system will increase. When it exceeds the rated pressure value set by the relief valve, the hydraulic oil enters the pressure relief pipe inside the integrated oil circuit block through the leakage hole of the relief valve, and the pressure relief pipe flows back to the oil tank through the return oil pipe, so that the system pressure remains constant, preventing the car power pump from overloading, thereby avoiding damage to the hydraulic system components; since the inlet and outlet of the one-way valve are respectively connected to the low and high pressure sides of the oil circuit block, in this application scenario, the one-way valve is in a closed state under the action of the oil pressure, which does not affect the normal function of this application scenario; When the second application scenario occurs, that is, if the power pump is damaged or the hydraulic line is blocked while the vehicle is driving, the power hydraulic system loses pressure and the wheel steering power function fails. However, the steering wheel must still have steering control capabilities to enable the driver to control the vehicle to a safe state. At this time, the driver needs to use a large force to drive the vehicle steering wheel to drive the steering gear to drive the steering wheel to turn. At the same time, the piston in the steering valve moves axially. In order to solve the problem that the hydraulic oil cannot enter the steering valve driving piston chamber through the oil inlet pipeline due to pipeline blockage, the hydraulic oil in the oil tank enters the oil inlet pipe through the first oil pipe and the one-way valve. Since the inlet and outlet sides of the one-way valve are connected to the low-pressure and high-pressure oil channels respectively, the one-way valve is turned on under the action of the oil pressure difference on both sides and enters the driving side of the piston chamber in the steering valve to avoid the vacuum state formed in the driving chamber due to the movement of the steering valve piston. Then, the piston inside the steering valve can move under the drive of the steering wheel to drive the wheel to turn, realize the normal steering function of the wheel, and avoid the dead stagnation of the wheel steering. That is, when the power pump is damaged or the hydraulic pipeline is blocked, if the steering wheel is turned to drive the wheel to steer, the hydraulic oil will enter the oil inlet pipe from the oil tank through the one-way valve, and then enter the steering valve, thereby replenishing the vacuum chamber formed by the movement of the piston in the steering power cylinder. The steering power cylinder piston can move under the drive of the steering wheel, drive the wheel to steer, realize the normal steering function of the wheel, and avoid the phenomenon of wheel steering stagnation.

2. A composite automobile hydraulic steering assistance protection system according to claim 1, characterized in that: A sealing ring is sleeved on one end of the oil inlet pipe close to the bolt, and the oil inlet pipe is sealed with the end face of the integrated oil circuit block via the sealing ring.

3. The composite automobile hydraulic steering assistance protection system according to claim 1, characterized in that: A plurality of sealing grooves are provided on the outer wall of the oil return pipe, and sealing rings are arranged in the sealing grooves. The outer side of the oil return pipe is radially sealed with the inner wall of the through hole provided in the integrated oil circuit block.

4. The composite automobile hydraulic steering assistance protection system according to claim 1, characterized in that: The oil inlet pipe and the bolt as well as the oil return pipe and the bolt are all integrally formed structures.

5. The composite automobile hydraulic steering assistance protection system according to claim 1, characterized in that: Oil guide holes are provided on the side walls of the oil inlet pipe and the side walls of the oil return pipe. The oil guide holes on the oil inlet pipe and the oil guide holes on the oil return pipe are connected via the pressure relief pipe provided inside the integrated oil circuit block.

6. A composite automobile hydraulic steering assistance protection system according to claim 2 or 3, characterized in that: The sealing ring is an O-type rubber ring.

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