Stepless pressure regulating power steering pump with cartridge valve

Abstract

The utility model relates to a stepless pressure regulating power steering pump with a cartridge valve, and belongs to the technical field of power steering pumps. Comprising a pump body, a rear cover is arranged at the rear end of the pump body, and a mounting hole is formed in the outer side face of the rear cover; a cartridge valve is arranged at the mounting hole; the cartridge valve comprises a valve seat, the valve seat is in threaded connection with the interior of the mounting hole, a main valve sleeve is in threaded connection with the interior of an opening in the lower end of the valve seat, a cover plate seat is in threaded connection with the interior of an opening in the upper end of the main valve sleeve, the cover plate seat is provided with a vertically-through pilot valve oil inlet hole, and a steel ball, a steel ball seat and a pilot valve spring are arranged in the valve seat. The steel ball is located at an opening in the upper end of the pilot valve oil inlet hole, a steel ball seat is arranged above the steel ball, the pilot valve spring is located at the upper end of the steel ball seat, a pilot valve cover plate is in threaded connection with the outer side of the opening in the upper end of the valve seat, an adjusting screw is in threaded connection with the interior of the pilot valve cover plate, and the pilot valve spring is arranged between the adjusting screw and the steel ball seat; the problem that stepless adjustment of pressure adjustment of an existing power steering pump cannot be achieved is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steering assist pumps, and particularly relates to a stepless pressure regulating steering assist pump with a cartridge valve. Background Art

[0002] With the development of domestic and foreign automobile manufacturing industries, more and more automobile enterprises require convenient and fast pressure regulation of steering assist pumps to meet the pressure requirements of different vehicle models for the pumps. The existing pressure regulation method of steering assist pumps is to adjust the elastic force of the pressure regulating spring by increasing or decreasing pressure regulating gaskets, and then adjust the pressure of the steering assist pump. This regulation method can only perform jump regulation on the pressure and cannot achieve stepless regulation. Therefore, it may not be possible to obtain the ideal pressure value. At the same time, when adjusting the pressure, the whole needs to be disassembled to increase or remove the pressure regulating gaskets. This method is likely to cause the hydraulic oil in the pump and pipeline to flow out, resulting in waste and environmental pollution. Content of the Utility Model

[0003] The utility model overcomes the deficiencies of the prior art and provides a stepless pressure regulating steering assist pump with a cartridge valve, which solves the problem that the pressure regulation of the current steering assist pump cannot achieve stepless regulation.

[0004] To achieve the above object, the utility model is realized by the following technical solutions.

[0005] A stepless pressure regulating steering assist pump with a cartridge valve includes a pump body. A rear cover is arranged at the rear end of the pump body. A rear working cavity with a front opening is arranged on the front end face of the rear cover. An installation hole is arranged on the outer side face of the rear cover, and the inner end of the installation hole is communicated with the inner area of the rear working cavity at the rear side of the oil distribution disc. A cartridge valve is arranged at the installation hole. The cartridge valve includes a valve seat. The outer side of the lower end opening of the valve seat is screwed inside the outer end opening of the installation hole. A main valve sleeve is screwed inside the lower end opening of the valve seat. An overflow hole is arranged in the middle of the side wall of the main valve sleeve. The outer side face of the lower end opening of the main valve sleeve is in contact with the inner wall of the installation hole. A main valve spool is slidably connected inside the lower end opening of the main valve sleeve. A cover plate seat is screwed inside the upper end opening of the main valve sleeve. A pilot valve oil inlet hole that penetrates up and down is arranged on the axis of the cover plate seat. A steel ball, a steel ball seat, and a pilot valve spring are arranged inside the valve seat. The steel ball is located at the upper end opening of the pilot valve oil inlet hole. The steel ball seat is arranged above the steel ball. The pilot valve spring is located above the steel ball seat. A pilot valve cover plate is screwed outside the upper end opening of the valve seat. A threaded hole that penetrates up and down is arranged on the top plate of the pilot valve cover plate. A vertical adjusting screw is screwed inside the threaded hole. The pilot valve spring is arranged between the adjusting screw and the steel ball seat.

[0006] Further, the valve seat is a circular cylindrical structure with openings at both the upper and lower ends. The main valve sleeve is also a circular cylindrical structure with openings at both the upper and lower ends. The upper outer side of the main valve sleeve is screwed inside the lower opening of the valve seat, and the inside of the main valve sleeve is connected to the inside of the installation hole through an overflow hole. The lower opening of the main valve sleeve is the main valve oil inlet.

[0007] Further, the main valve spool is a cylindrical structure with an opening at the lower end. At the inner top surface of the main valve spool, there is a first damping hole that penetrates up and down. The outer side of the main valve spool is in sliding contact with the inner side of the lower opening of the main valve sleeve.

[0008] Further, at the center of the lower end surface of the cover plate seat, there is a circular groove. Inside the circular groove, there is a main valve cover plate in the shape of a circular plate. At the axis of the main valve cover plate, there is a second damping hole that penetrates up and down, and the second damping hole is connected to the pilot valve oil inlet hole.

[0009] Further, at the center of the lower end surface of the ball seat, there is a cylindrical groove. The ball is located at the cylindrical groove, and the outside of the ball is the pilot valve oil outlet hole.

[0010] Further, the pilot valve cover plate is a cylindrical structure with an opening at the lower end. The inner wall of the pilot valve cover plate is screwed to the outer side of the upper opening of the valve seat.

[0011] Further, the lower end of the adjusting screw extends into the upper opening of the valve seat, and a sliding column is fixedly arranged at the lower end of the adjusting screw. The sliding column is in sliding contact with the inner wall of the upper opening of the valve seat.

[0012] Further, the pilot valve spring is arranged between the sliding column at the lower end of the adjusting screw and the ball seat.

[0013] Further, a lock nut and a protective cap are screwed on the outside of the adjusting screw. The lock nut is in contact with the upper end surface of the pilot valve cover plate. The protective cap is a cylindrical structure with an opening at the lower end. The inner wall of the protective cap is screwed to the adjusting screw, and the inner wall of the protective cap is in contact with the lock nut.

[0014] Furthermore, an oil return port is provided on the side wall of the installation hole outside the overflow hole, and an oil return port is also provided on the side wall of the valve seat at the pilot valve oil outlet hole. The oil return port is connected to the fuel tank through an oil return pipeline.

[0015] The beneficial effects of the present utility model compared with the prior art are as follows:

[0016] A stepless pressure-regulating steering assist pump with a cartridge valve provided by the present utility model is convenient and reliable for the entire process of pressure adjustment, without the disassembly of internal parts, avoiding damage to parts caused by incorrect operation of non-professionals, and there will be no oil leakage during the whole process, meeting the requirements of environmental protection and energy conservation. Since the pressure adjustment is achieved only by screw rotation, stepless adjustment can be realized. At the same time, in the design process, the cartridge valve is integrated into a whole, facilitating the overall procurement of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 is a schematic structural view of the whole of the present utility model;

[0019] Figure 2 is a schematic structural view of the cartridge valve;

[0020] Among them, 1 is the pump body, 2 is the front cover, 3 is the rear cover, 4 is the rear working chamber, 5 is the pump shaft, 6 is the bearing, 7 is the skeleton oil seal, 8 is the rotor, 9 is the vane, 10 is the stator, 11 is the oil distribution disc, 12 is the first spring, 13 is the positioning pin, 14 is the mounting hole, 15 is the valve seat, 16 is the main valve sleeve, 17 is the main valve inlet, 18 is the overflow hole, 19 is the main valve spool, 20 is the cover seat, 21 is the main valve cover, 22 is the steel ball, 23 is the steel ball seat, 24 is the pilot valve oil outlet hole, 25 is the pilot valve spring, 26 is the pilot valve cover, 27 is the adjusting screw, 28 is the sliding column, 29 is the locking nut, 30 is the protective cap, 31 is the pilot valve inlet hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. The technical solutions of the present utility model will be described in detail below in combination with the embodiments and the accompanying drawings, but the protection scope is not limited by this.

[0022] As Figure 1 shown in FIG. - 2, the present utility model provides a stepless pressure-regulating steering assist pump with a cartridge valve, including a pump body 1. A front working chamber with openings at both front and rear ends is arranged inside the pump body 1. A front cover 2 is arranged at the front end of the pump body 1, and a rear cover 3 is arranged at the rear end of the pump body 1. The front cover 2 and the rear cover 3 are both fixedly connected to the pump body 1 by bolts. A rear working chamber 4 with a front opening is arranged on the front end face of the rear cover 3.

[0023] A pump shaft 5 is rotatably arranged inside the front working chamber. A front fixing hole penetrating through the front and rear is provided on the front cover 2. The front end of the pump shaft 5 passes through the front fixing hole and extends to the outside of the front fixing hole. An external spline is provided at the front end of the pump shaft 5. A bearing 6 and a skeleton oil seal 7 are arranged between the front end opening of the pump shaft 5 and the front fixing hole, and the skeleton oil seal 7 is located inside the bearing 6.

[0024] A rotor 8 is fixedly sleeved outside the pump shaft 5 inside the front working chamber. A circle of sliding grooves is provided on the outer cylindrical surface of the rotor 8, and a vane 9 is slidably arranged inside each sliding groove. An annular stator 10 is fixedly arranged on the inner wall of the front working chamber. The outer ends of a circle of vanes 9 are in sliding contact with the inner wall of the stator 10. The axis of the stator 10 is eccentrically arranged with respect to the axis of the rotor 8.

[0025] An oil suction port and an oil pressure port are provided on the front cover 2, and the oil suction port and the oil pressure port are respectively communicated with the oil suction area and the oil pressure area inside the front working chamber.

[0026] An oil distribution disc 11 is provided at the front end opening of the rear working chamber 4. A rear fixing hole is provided at the center of the front end face of the oil distribution disc 11. The rear end of the pump shaft 5 is inserted into the rear fixing hole of the oil distribution disc 11, and a sliding bearing is arranged between the rear end of the pump shaft 5 and the inner wall of the rear fixing hole. A cylindrical protrusion is fixedly arranged at the center of the rear end face of the oil distribution disc 11, and an annular protrusion is fixedly arranged at the center of the rear inner wall of the rear working chamber 4. A first spring 12 is sleeved outside the cylindrical protrusion. One end of the first spring 12 is in contact with the rear end face of the oil distribution disc 11, and the other end of the first spring 12 extends into the annular protrusion and is in contact with the inner bottom surface of the annular protrusion. The oil distribution disc 11 is pressed tightly by the resilience of the first spring 12, so that the oil distribution disc 11 is in contact with the rotor 8, the stator 10, and the vanes 9.

[0027] Multiple positioning pins 13 are sequentially passed through the oil distribution disc 11, the pump body 1, and the front cover 2 to realize the mutual positioning among the three.

[0028] An oil suction connection hole and an oil pressure connection hole are provided on the oil distribution disc 11. The oil suction area inside the front working chamber is communicated with the inner area of the rear working chamber 4 behind the oil distribution disc 11 through the oil suction connection hole, and the oil pressure area inside the front working chamber is communicated with the inner area of the rear working chamber 4 behind the oil distribution disc 11 through the oil pressure connection hole.

[0029] An installation hole 14 is provided on the outer side surface of the rear cover 3. The inner end of the installation hole 14 is communicated with the inner area of the rear working chamber 4 behind the oil distribution disc 11. An insertion valve is provided at the installation hole 14.

[0030] The cartridge valve includes a main valve sleeve 16, a main valve spool 19, a return spring, a main valve cover plate 21, a steel ball 22, a steel ball seat 23, a pilot valve spring 25, a valve seat 15, a pilot valve cover plate 26, and an adjusting screw 27.

[0031] The valve seat 15 is a circular cylindrical structure with openings at both the upper and lower ends. The outer side of the lower end opening of the valve seat 15 is screwed inside the outer end opening of the mounting hole 14. Inside the lower end opening of the valve seat 15, a main valve sleeve 16 is screwed. The main valve sleeve 16 is a circular cylindrical structure with openings at both the upper and lower ends. The upper end of the outer side surface of the main valve sleeve 16 is screwed inside the lower end opening of the valve seat 15. An overflow hole 18 is provided in the middle of the side wall of the main valve sleeve 16. The inside of the main valve sleeve 16 is connected to the inside of the mounting hole 14 through the overflow hole 18. The lower end opening of the main valve sleeve 16 is the main valve oil inlet 17, and the outer side surface of the lower end opening of the main valve sleeve 16 is in contact with the inner wall of the mounting hole 14. A main valve spool 19 is slidably connected inside the lower end opening of the main valve sleeve 16. The main valve spool 19 is a cylindrical structure with an opening at the lower end. A first damping hole that penetrates up and down is provided at the inner top surface of the main valve spool 19. The outer side surface of the main valve spool 19 is in sliding contact with the inner side surface of the lower end opening of the main valve sleeve 16. A cover plate seat 20 is screwed inside the upper end opening of the main valve sleeve 16. A pilot valve oil inlet hole 31 that penetrates up and down is provided at the axis of the cover plate seat 20. A circular groove is provided at the center of the lower end surface of the cover plate seat 20. Inside the circular groove, a main valve cover plate 21 in the shape of a circular plate is provided. A second damping hole that penetrates up and down is provided at the axis of the main valve cover plate 21. The second damping hole is connected to the pilot valve oil inlet hole 31.

[0032] A steel ball 22, a steel ball seat 23, and a pilot valve spring 25 are provided inside the valve seat 15. A steel ball 22 is provided at the center of the upper end surface of the cover plate seat 20. The steel ball 22 is located at the upper end opening of the pilot valve oil inlet hole 31. The outer side of the steel ball 22 is the pilot valve oil outlet hole 24. A steel ball seat 23 is provided above the steel ball 22. A cylindrical groove is provided at the center of the lower end surface of the steel ball seat 23. The steel ball 22 is located at the cylindrical groove. The pilot valve spring 25 is located above the steel ball seat 23.

[0033] A pilot valve cover plate 26 is screwed outside the upper end opening of the valve seat 15. The pilot valve cover plate 26 is a cylindrical structure with an opening at the lower end. The inner wall of the pilot valve cover plate 26 is screwed to the outer side surface of the upper end opening of the valve seat 15. A threaded hole that penetrates up and down is provided at the top plate of the pilot valve cover plate 26. A vertical adjusting screw 27 is screwed inside the threaded hole. The lower end of the adjusting screw 27 extends into the upper end opening of the valve seat 15, and a sliding column 28 is fixedly provided at the lower end of the adjusting screw 27. The sliding column 28 is in sliding contact with the inner wall of the upper end opening of the valve seat 15. The pilot valve spring 25 is provided between the sliding column 28 at the lower end of the adjusting screw 27 and the steel ball seat 23.

[0034] A locking nut 29 and a protective cap 30 are screwed on the outer side of the adjusting screw rod 27. The locking nut 29 is in contact with the upper end surface of the pilot valve cover plate 26. The protective cap 30 is of a cylindrical structure with an open lower end. The inner wall of the protective cap 30 is screwed with the adjusting screw rod 27, and the lower end of the protective cap 30 is in contact with the locking nut 29.

[0035] An oil return port is provided on the side wall of the mounting hole 14 outside the overflow hole 18, and an oil return port is also provided on the side wall of the valve seat 15 at the pilot valve oil outlet hole 24. The oil return port is connected to the fuel tank through an oil return pipeline.

[0036] The working principle of the present utility model is as follows:

[0037] During the operation of the steering assist pump, it enters the interior of the mounting hole 14 through the oil suction connection hole and the oil pressure connection hole. The oil in the mounting hole 14 enters the interior of the main valve spool 19 through the main valve oil inlet 17, and enters the interior of the pilot valve oil inlet hole 31 through the first damping hole of the main valve spool 19 and the second damping hole of the main valve cover plate 21. When the oil pressure inside the main valve sleeve 16 is less than the set pressure of the pilot valve spring 25, the steel ball 22 is in close contact with the upper end opening of the pilot valve oil inlet hole 31 of the cover seat 20 under the pressure of the pilot valve spring 25, so that the upper end opening of the pilot valve oil inlet hole 31 is in a closed state, and no oil passes through the first damping hole inside the main valve spool 19. The pressures in the upper and lower chambers of the main valve spool 19 are equal, and the main valve spool 19 closes the overflow hole 18 under the resilience of the return spring, so that no overflow occurs at the overflow hole 18.

[0038] When the system pressure reaches or exceeds the set pressure of the pilot valve spring 25, the steel ball 22 is separated from the cover seat 20 under the action of the hydraulic pressure. The upper end opening of the pilot valve oil inlet hole 31 of the cover seat 20 is opened, the pilot valve oil outlet hole 24 is opened, and the pilot valve starts to overflow. At this time, oil passes through the first damping hole inside the main valve spool 19, and the pressures in the upper and lower chambers of the main valve spool 19 are no longer equal. The main valve spool 19 starts to move towards the side of the main valve cover plate 21 under the action of the oil pressure, and the return spring is compressed. When the main valve spool 19 moves to expose the overflow hole 18, the overflow hole 18 is opened, and the main valve starts to overflow.

[0039] When the steering assist pump leaves the factory, the setting pressure of the cartridge valve is adjusted to the minimum of 4 Mpa, and then the cartridge valve is screwed into the rear cover 3 of the steering assist pump. After installation, the setting pressure can be adjusted according to the pressure requirement. The specific operation method is as follows: Unscrew the protective cap 30, loosen the lock nut 29, and then rotate the adjusting screw 27 clockwise. The length of the adjusting screw 27 screwed into the inside of the valve seat 15 is increased, so that the pilot valve spring 25 is further compressed, and the resilience of the pilot valve spring 25 is increased, thereby increasing the setting pressure to the required value. Then tighten the lock nut 29 and screw in the protective cap 30 to complete the whole adjustment process. The whole process is convenient and reliable, without the disassembly of internal parts, avoiding the damage of parts caused by the misoperation of non-professionals. There will be no oil leakage phenomenon during the whole process, meeting the environmental protection and energy-saving requirements. Since only the rotation of the thread is used to achieve the pressure adjustment, stepless adjustment can be realized. At the same time, in the design process, the cartridge valve is integrated into a whole, which is convenient for the overall procurement of parts.

[0040] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. An infinitely variable pressure regulating steering booster pump with a cartridge valve, characterized in that: It includes a pump body (1), a rear cover (3) is provided at the rear end of the pump body (1), a rear working chamber (4) with a front opening is provided at the front end face of the rear cover (3), a mounting hole (14) is provided on the outer side surface of the rear cover (3), and the inner end of the mounting hole (14) is communicated with the inner area of the rear working chamber (4) at the rear side of the oil distribution disc (11); an inserted valve is provided at the mounting hole (14); the inserted valve includes a valve seat (15), the outer side of the lower end opening of the valve seat (15) is screwed inside the outer end opening of the mounting hole (14), a main valve sleeve (16) is screwed inside the lower end opening of the valve seat (15), an overflow hole (18) is provided in the middle of the side wall of the main valve sleeve (16), the outer side surface of the lower end opening of the main valve sleeve (16) is in contact with the inner wall of the mounting hole (14), a main valve spool (19) is slidably connected inside the lower end opening of the main valve sleeve (16), a cover plate seat (20) is screwed inside the upper end opening of the main valve sleeve (16), a pilot valve oil inlet hole (31) that penetrates up and down is provided at the axis of the cover plate seat (20), a steel ball (22), a steel ball seat (23), and a pilot valve spring (25) are provided inside the valve seat (15), the steel ball (22) is located at the upper end opening of the pilot valve oil inlet hole (31), a steel ball seat (23) is provided above the steel ball (22), the pilot valve spring (25) is located at the upper end of the steel ball seat (23), a pilot valve cover plate (26) is screwed outside the upper end opening of the valve seat (15), a threaded hole that penetrates up and down is provided at the top plate of the pilot valve cover plate (26), a vertical adjusting screw (27) is screwed inside the threaded hole, and the pilot valve spring (25) is provided between the adjusting screw (27) and the steel ball seat (23).

2. The infinitely variable pressure regulating steering assist pump with an inserted valve according to claim 1, characterized in that: The valve seat (15) is a circular cylindrical structure with openings at both the upper and lower ends. The main valve sleeve (16) is a circular cylindrical structure with openings at both the upper and lower ends. The upper end of the outer side surface of the main valve sleeve (16) is screwed inside the lower end opening of the valve seat (15). The inside of the main valve sleeve (16) is communicated with the inside of the mounting hole (14) through the overflow hole (18). The lower end opening of the main valve sleeve (16) is the main valve oil inlet (17).

3. The infinitely variable pressure regulating steering booster pump with a cartridge valve according to claim 2, characterized in that: The main valve spool (19) is a cylindrical structure with an opening at the lower end. A first damping hole that penetrates up and down is provided at the inner top surface of the main valve spool (19). The outer side surface of the main valve spool (19) is in sliding contact with the inner side surface of the lower end opening of the main valve sleeve (16).

4. The infinitely variable pressure regulating steering booster pump with an inserted valve according to claim 3, characterized in that: A circular groove is provided at the center of the lower end face of the cover plate seat (20). A main valve cover plate (21) in the shape of a circular plate is provided inside the circular groove. A second damping hole that penetrates up and down is provided at the axis of the main valve cover plate (21), and the second damping hole is communicated with the pilot valve oil inlet hole (31).

5. The infinitely variable pressure regulating steering booster pump with an inserted valve according to claim 4, characterized in that: A cylindrical groove is provided at the center of the lower end face of the steel ball seat (23). The steel ball (22) is located at the cylindrical groove, and the pilot valve oil outlet hole (24) is on the outside of the steel ball (22).

6. The infinitely variable pressure regulating steering assist pump with a cartridge valve according to claim 5, characterized in that: The pilot valve cover plate (26) is a cylindrical structure with an opening at the lower end. The inner wall of the pilot valve cover plate (26) is screwed to the outer side surface of the upper end opening of the valve seat (15).

7. The infinitely variable pressure regulating steering assist pump with a cartridge valve according to claim 6, characterized in that: The lower end of the adjusting screw (27) extends into the inner part of the upper opening of the valve seat (15), and a sliding column (28) is fixedly arranged at the lower end of the adjusting screw (27). The sliding column (28) is in sliding contact with the inner wall of the upper opening of the valve seat (15).

8. The infinitely variable pressure regulating steering assist pump with an inserted valve according to claim 7, characterized in that: The pilot valve spring (25) is arranged between the sliding column (28) at the lower end of the adjusting screw (27) and the ball seat (23).

9. The infinitely variable pressure regulating steering booster pump with a cartridge valve according to claim 8, characterized in that: A lock nut (29) and a protective cap (30) are screwed on the outside of the adjusting screw (27). The lock nut (29) is in contact with the upper end surface of the pilot valve cover plate (26). The protective cap (30) is of a cylindrical structure with an open lower end. The inner wall of the protective cap (30) is screwed with the adjusting screw (27), and the lower end of the protective cap (30) is in contact with the lock nut (29).

10. A stepless pressure-regulating steering assist pump with a cartridge valve according to claim 9, characterized in that: An oil return port is arranged on the side wall of the mounting hole (14) outside the overflow hole (18), and an oil return port is also arranged on the side wall of the valve seat (15) at the pilot valve oil outlet (24). The oil return port is connected to the fuel tank through an oil return pipeline.

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