Automotive power steering gear automatic stroke unloading valve

Abstract

The utility model provides an automatic stroke unloading valve of automobile power steering gear, including valve body, the first oil inlet is opened to valve body top, the installation cavity is opened to valve body bottom, the installation cavity is linked with first oil inlet, the annular groove is opened to valve body and is located installation cavity top side wall, the oil outlet is provided with valve body right side, the oil outlet is linked with annular groove, the second oil inlet is provided with valve body left side middle part, the second oil inlet is linked with installation cavity, the valve core subassembly is connected with installation cavity bottom end internal thread, the clamping cover subassembly is connected with second oil inlet screw, the cover filter screen is provided with clamping cover subassembly inside, and the accommodating cavity is set between clamping cover subassembly inner wall and cover filter screen outer wall. The utility model has the advantages of good filtering effect, reduce the frequency of cleaning impurities, convenient adjustment piston triggered initial pressure.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, and in particular to an automatic stroke unloading valve for automotive power steering. Background Technology

[0002] An unloading valve is typically a relief valve with a two-position two-way valve (often a solenoid valve). Its function is to set the main pressure of the system (oil pump) when not unloading. When unloading, the pressurized oil returns directly to the oil tank (by the action of the two-position two-way valve), and the oil pump pressure drops to near zero, so as to realize some loop control, improve the life of the oil pump, and reduce power consumption.

[0003] Chinese patent application date: December 11, 2023, publication number: CN221591384U, discloses a hydraulic steering gear unloading valve, including a valve body. The valve body has a movable cavity at its bottom end and a main oil inlet communicating with the movable cavity at its top end. The inner diameter of the main oil inlet is smaller than that of the movable cavity. A PLS oil inlet is located in the middle of the side wall of the movable cavity, and an oil outlet is located on the top side wall of the movable cavity. A valve core assembly is disposed inside the movable cavity, and a plug is fixedly connected to the bottom end of the movable cavity. This invention includes a valve body, a plug, a guide rod, a sliding sleeve, a piston, a spring, and a filter assembly. When oil enters through the PLS oil inlet on one side of the valve body, it first passes through the filter screen of the filter assembly. The filter screen can filter out fine impurities caused by mechanical wear, preventing these impurities from clogging the PLS oil inlet. Furthermore, the entire filter assembly is detachable; only periodic disassembly and cleaning of the filter screen are required, thereby improving the valve's service life.

[0004] In this technical solution, the filter screen can prevent the PLS oil inlet from being blocked. However, after the filter screen intercepts impurity particles, these particles tend to accumulate quickly on one side of the screen, causing blockage and affecting the flow of hydraulic oil. Therefore, further improvements can be made. Summary of the Invention

[0005] In order to solve the problems existing in the background art, this utility model proposes an automatic stroke unloading valve for automotive power steering.

[0006] An automatic stroke unloading valve for an automotive power steering system includes a valve body. A first oil inlet is located at the top of the valve body, and a mounting cavity is located at the bottom of the valve body, communicating with the first oil inlet. An annular groove is formed on the top side wall of the mounting cavity, and an oil outlet is located on the right side of the valve body, communicating with the annular groove. A second oil inlet is located in the middle of the left side of the valve body, communicating with the mounting cavity. A valve core assembly is internally threaded to the bottom of the mounting cavity, and a clamping cover assembly is threaded to the second oil inlet. A cover-shaped filter screen is disposed inside the clamping cover assembly, and a receiving cavity is formed between the inner wall of the clamping cover assembly and the outer wall of the cover-shaped filter screen.

[0007] Based on the above, the valve core assembly includes a plugging column threadedly connected to the bottom end of the mounting cavity, a threaded rod at the center of the plugging column, a sleeve sleeved on the outer side of the top end of the threaded rod, a piston fixedly installed on the top end of the sleeve, a spring sleeved on the outer side of the threaded rod, the spring fitting against the bottom end of the sleeve, the piston fitting against the top wall of the mounting cavity through the elasticity of the spring, and an elastic adjusting element provided on the threaded rod.

[0008] Based on the above, the elastic adjusting component includes a slide block threadedly connected to a threaded rod, the threaded rod being rotatably connected to the center of the blocking column, the valve body having a groove on the side wall of the mounting cavity, and the slide block being slidably connected to the groove; a top plate is fixedly installed at the bottom end of the sleeve, and clamping plates are fixedly installed on both the left and right sides of the top plate, with the two clamping plates clamping the left and right sides of the slide block.

[0009] Based on the above, a turntable is fixedly installed at the bottom of the threaded rod, and a bolt is threaded onto the turntable, with the bolt fitting against the bottom of the blocking column.

[0010] Based on the above, the clamping cover assembly includes a threaded pipe threaded to the second oil inlet, an outer fixing cover fixedly installed at the left end of the threaded pipe, an inner cover internally threaded to the left end of the outer fixing cover, and a connecting pipe fixedly installed on the left side of the inner cover; a fixing ring is fixedly installed on the right edge of the cover-shaped filter screen, the fixing ring is attached to the inner wall of the right end of the outer fixing cover, and the right end of the inner cover is attached to the left side of the fixing ring.

[0011] Based on the above, a support ring is fixedly installed on the inner wall of the right end of the outer fixed cover. The support ring is inserted into the cover-shaped filter screen, and oil grooves are arrayed on the circumferential surface of the support ring.

[0012] This invention has substantial features and advancements compared to existing technologies. Specifically, this invention forms a receiving cavity between the cover-shaped filter and the inner cover. Impurity particles intercepted by the cover-shaped filter accumulate in the receiving cavity, prolonging the time it takes for the cover-shaped filter to become completely clogged and reducing the frequency of cleaning impurity particles. Furthermore, by turning the threaded rod, the length of the compressed spring can be adjusted, thereby adjusting the hydraulic pressure inside the first oil inlet when the piston is triggered. This invention has the advantages of good filtration effect, reduced frequency of impurity cleaning, and easy adjustment of the initial pressure when the piston is triggered. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 This is a schematic diagram of the front cross-sectional structure of this utility model.

[0015] Figure 3This is a three-dimensional cross-sectional structural diagram of the present invention.

[0016] Figure 4 This is a three-dimensional structural diagram of the valve core assembly of this utility model.

[0017] Figure 5 This is a three-dimensional structural diagram of the clamping cover assembly of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 100, valve body; 200, first oil inlet; 300, mounting cavity; 400, annular groove; 500, oil outlet; 600, second oil inlet; 700, valve core assembly; 800, clamping cover assembly; 900, hood-shaped filter screen; 701. Blocking column; 702. Threaded rod; 703. Sleeve; 704. Piston; 705. Spring; 706. Slide; 707. Slide groove; 708. Top plate; 709. Clamping plate; 710. Turntable; 711. Bolt; 801. Threaded pipe; 802. Outer fixing cover; 803. Support ring; 804. Oil groove; 805. Inner cover; 806. Connecting pipe; 901. Fixing ring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figures 1-5 As shown, an automatic stroke unloading valve for an automotive power steering system includes a valve body 100. A first oil inlet 200 is provided at the top of the valve body 100, and a mounting cavity 300 is provided at the bottom of the valve body 100, communicating with the first oil inlet 200. An annular groove 400 is provided on the top side wall of the mounting cavity 300. An oil outlet 500 is provided on the right side of the valve body 100, communicating with the annular groove 400. A second oil inlet 600 is provided in the middle of the left side of the valve body 100, communicating with the mounting cavity 300. A valve core assembly 700 is internally threaded to the bottom of the mounting cavity 300, and a clamping cover assembly 800 is threaded to the second oil inlet 600. A cover-shaped filter 900 is provided inside the clamping cover assembly 800, and a receiving cavity is provided between the inner wall of the clamping cover assembly 800 and the outer wall of the cover-shaped filter 900. The impurity particles intercepted by the hood-shaped filter 900 accumulate inside the receiving cavity, preventing the hood-shaped filter 900 from being quickly clogged.

[0021] In use, the valve core assembly 700 includes a plugging post 701 threadedly connected to the bottom end of the mounting cavity 300. A threaded rod 702 is provided at the center of the plugging post 701. A sleeve 703 is sleeved on the outer side of the top end of the threaded rod 702. A piston 704 is fixedly installed on the top end of the sleeve 703. A spring 705 is sleeved on the outer side of the threaded rod 702. The spring 705 is attached to the bottom end of the sleeve 703. The piston 704 is attached to the top wall of the mounting cavity 300 by the elasticity of the spring 705. An elastic adjusting element is provided on the threaded rod 702. The piston 704 is driven downward by the hydraulic pressure inside the first oil inlet 200. The spring 705 is compressed. During the downward movement of the piston 704, the hydraulic oil can flow back to the oil tank through the annular groove 400 and the oil outlet 500.

[0022] In practice, the elastic adjusting component includes a slide 706 threadedly connected to a threaded rod 702. The threaded rod 702 is rotatably connected to the center of the blocking column 701. A groove 707 is provided on the side wall of the mounting cavity 300 of the valve body 100, and the slide 706 is slidably connected to the groove 707. A top plate 708 is fixedly installed at the bottom end of the sleeve 703. Specifically, the two ends of the spring 705 are respectively attached to the opposite sides of the slide 706 and the top plate 708. By turning the threaded rod 702, the slide 706 can be driven to slide along the groove 707, adjusting the initial compression of the spring 705, thereby adjusting the hydraulic pressure inside the first oil inlet 200 when the piston 704 is triggered to move downward. Clamping plates 709 are fixedly installed on both sides of the top plate 708, and the two clamping plates 709 clamp the left and right sides of the slide 706. Thus, by cooperating with the clamping plate 709 and the slide block 706, the top plate 708 is limited, preventing the sleeve 703 and the piston 704 from rotating.

[0023] Specifically, a turntable 710 is fixedly installed at the bottom of the threaded rod 702, and a bolt 711 is threaded onto the turntable 710. The bolt 711 fits against the bottom of the plug column 701. After rotating the threaded rod 702, the bolt 711 is tightened to limit the rotation of the threaded rod 702 and prevent it from being rotated accidentally.

[0024] In practice, the clamping cover assembly 800 includes a threaded pipe 801 threadedly connected to the second oil inlet 600. An outer fixed cover 802 is fixedly installed at the left end of the threaded pipe 801. An inner embedded cover 805 is internally threadedly connected to the left end of the outer fixed cover 802. A connecting pipe 806 is fixedly installed on the left side of the inner embedded cover 805. A fixing ring 901 is fixedly installed on the right edge of the cover-shaped filter 900, fitting against the inner wall of the right end of the outer fixed cover 802. The right end of the inner embedded cover 805 fits against the left side of the fixing ring 901. Filter holes are provided on both the left end and the circumferential surface of the cover-shaped filter 900. A receiving cavity is formed between the outer wall of the cover-shaped filter 900 and the inner wall of the inner embedded cover 805. Impurities intercepted by the cover-shaped filter 900 accumulate at the bottom of the receiving cavity, prolonging the time it takes for the cover-shaped filter 900 to become completely clogged. The inner embedded cover 805 can be periodically unscrewed to clean impurities and replace the cover-shaped filter 900. A support ring 803 is fixedly installed on the inner wall of the right end of the outer fixed cover 802. The support ring 803 is inserted into the cover-shaped filter screen 900. Oil grooves 804 are arranged in an array on the circumferential surface of the support ring 803. The support ring 803 supports the cover-shaped filter screen 900 to prevent the cover-shaped filter screen 900 from deforming under the impact of hydraulic oil.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An automatic stroke unloading valve for an automotive power steering system, characterized in that: The valve body (100) includes a valve body (100), a first oil inlet (200) at the top end of the valve body (100), an installation cavity (300) at the bottom end of the valve body (100) and the installation cavity (300) communicating with the first oil inlet (200), an annular groove (400) on the top side wall of the installation cavity (300) of the valve body (100), and an oil outlet (500) on the right side of the valve body (100) communicating with the annular groove (400). A second oil inlet (600) is provided in the middle of the left side of the valve body (100). The second oil inlet (600) is connected to the mounting cavity (300). A valve core assembly (700) is internally threaded at the bottom of the mounting cavity (300). A clamping cover assembly (800) is threaded on the second oil inlet (600). A cover-shaped filter screen (900) is provided inside the clamping cover assembly (800). A receiving cavity is provided between the inner wall of the clamping cover assembly (800) and the outer wall of the cover-shaped filter screen (900).

2. The automatic stroke unloading valve for automotive power steering according to claim 1, characterized in that: The valve core assembly (700) includes a plug (701) threadedly connected to the bottom of the mounting cavity (300). A threaded rod (702) is provided at the center of the plug (701). A sleeve (703) is sleeved on the outer side of the top end of the threaded rod (702). A piston (704) is fixedly installed on the top end of the sleeve (703). A spring (705) is sleeved on the outer side of the threaded rod (702). The spring (705) is attached to the bottom end of the sleeve (703). The piston (704) is attached to the top wall of the mounting cavity (300) by the elasticity of the spring (705). An elastic adjustment element is provided on the threaded rod (702).

3. The automatic stroke unloading valve for automotive power steering according to claim 2, characterized in that: The elastic adjusting component includes a slide (706) threadedly connected to a threaded rod (702), the threaded rod (702) being rotatably connected through the center of the blocking column (701), and the valve body (100) having a slide groove (707) on the side wall of the mounting cavity (300), the slide (706) being slidably connected to the slide groove (707); A top plate (708) is fixedly installed at the bottom of the sleeve (703), and clamping plates (709) are fixedly installed on both the left and right sides of the top plate (708). The two clamping plates (709) are clamped on the left and right sides of the slide (706).

4. The automatic stroke unloading valve for automotive power steering according to claim 3, characterized in that: A turntable (710) is fixedly installed at the bottom of the threaded rod (702), and a bolt (711) is threaded onto the turntable (710), with the bolt (711) fitting against the bottom of the plug column (701).

5. The automatic stroke unloading valve for automotive power steering according to claim 1, characterized in that: The clamping cover assembly (800) includes a threaded tube (801) threadedly connected to the second oil inlet (600), an outer fixing cover (802) fixedly installed at the left end of the threaded tube (801), an inner cover (805) internally threadedly connected at the left end of the outer fixing cover (802), and a connecting tube (806) fixedly installed on the left side of the inner cover (805). A fixing ring (901) is fixedly installed on the right edge of the cover-shaped filter (900). The fixing ring (901) is attached to the inner wall of the right end of the outer fixing cover (802). The right end of the inner cover (805) is attached to the left side of the fixing ring (901).

6. The automatic stroke unloading valve for automotive power steering according to claim 5, characterized in that: A support ring (803) is fixedly installed on the inner wall of the right end of the outer fixed cover (802). The support ring (803) is inserted into the cover-shaped filter screen (900). Oil grooves (804) are arrayed on the circumferential surface of the support ring (803).

Images