Power steering gear stroke pressure relief valve structure capable of being repeatedly adjusted

Abstract

The utility model discloses a power steering gear stroke pressure relief valve structure capable of being repeatedly adjusted, which comprises a shell and a steering nut, sealing nuts are fixed at the left side end and the top end of the shell, and the sealing nuts are in threaded connection with a first inner hexagonal flat head screw and a second inner hexagonal flat head screw. The first inner hexagonal flat head screw and the second inner hexagonal flat head screw penetrate through the shell, the ends of the first inner hexagonal flat head screw and the second inner hexagonal flat head screw extend into the shell, the ends of the first inner hexagonal flat head screw and the second inner hexagonal flat head screw are of spherical structures, a limiting valve seat and a limiting valve sleeve are arranged in the steering nut, and a steel ball and a limiting valve element are arranged in the limiting valve seat. A spring is further placed in the limiting valve seat and located between the steel ball and the limiting valve element, the right side end of the limiting valve element is of a conical structure and extends to the outer side of the steering nut, a limiting plate is further fixed to the left side end of the limiting valve element, and at least five oil through holes are distributed in the limiting plate. The pressure relief valve has the advantages of being simple in structure, stable in pressure relief and convenient to adjust.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic steering systems, in particular to a repeatedly adjustable power steering travel pressure relief valve structure. Background Art

[0002] Automobile steering gears are required to be able to withstand high temperatures, have a simple structure, be easy to assemble, and have stability and a long service life for the steering system. As users have increasingly higher requirements for the safety, stability and life of the steering system, how to make a steering gear with adjustable stroke, easy assembly and reliable performance has become an important and long-lasting topic in the steering industry.

[0003] When the automobile power steering gear is not equipped with a stroke pressure relief valve, during the steering process of the automobile, when the limit boss on the front wheel collides with the limit bolt on the steering knuckle, the front wheel is rigidly limited, the steering resistance is infinite, the pressure of the hydraulic system rises to the maximum, the hydraulic pump will generate a lot of heat, the working performance of the hydraulic system will accelerate the deterioration, and the steering rod system will be under great load, which greatly reduces the working life of the steering system. Therefore, a stroke pressure relief valve is often set in the steering gear to solve the above problems. However, the existing stroke pressure relief valve, such as patent No. CN113339344A, discloses a pressure relief valve and a hydraulic power steering gear including the same, which has a relatively complex structure, including the first and second ejector pin structures that require special processing, and the valve core is pushed by the ejector pin to move left and right, and it is impossible to fall completely into the center of the valve body every time, and there will be a certain deviation. Although the deviation is very small, it also affects the pressure relief stability effect, and the entire pressure relief structure cannot be repeatedly adjusted. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a repeatedly adjustable power steering travel pressure relief valve structure, which has simple structure, stable pressure relief and convenient adjustment.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] A repeatedly adjustable power steering travel pressure relief valve structure comprises a shell and a steering nut built in the shell, a sealing nut is fixed to the left end and the top end of the shell, a hexagon socket flat head screw 1 and a hexagon socket flat head screw 2 are respectively threadedly connected on the sealing nut and located at the left end and the top end of the shell, the hexagon socket flat head screw 1 and the hexagon socket flat head screw 2 penetrate the shell, and the ends extend into the shell, the ends of the hexagon socket flat head screw 1 and the hexagon socket flat head screw 2 are spherical structures, a limited valve seat and a limited valve sleeve are built in the steering nut, a steel ball and a limited valve core that can move left and right in the limited valve seat are built in the inner side of the limited valve seat, a spring is also placed in the limited valve seat and between the steel ball and the limited valve core, the right end of the limited valve core is a conical structure and extends to the outside of the steering nut, a limited plate is also fixed to the left end of the limited valve core, and at least five oil holes are distributed on the limited plate.

[0007] A further technical solution is that the left end of the spring abuts against the steel ball and the right end abuts against the limit plate, which can be used to reset the steel ball and the limit plate in the limit valve seat.

[0008] A further technical solution is that an elastic retaining ring for a hole is also fastened in the steering nut at the left end of the limit valve seat, and a flattened steel wire retaining ring for a hole is also fastened in the steering nut at the right end of the limit valve sleeve. For conventional parts, the left end of the limit valve sleeve abuts against the limit valve seat, and the right end abuts against the flattened steel wire retaining ring for the hole, thereby preventing the limit valve seat from moving left and right in the steering nut. During installation, the limit valve seat is first placed in the steering nut, and then the steel ball, the limit valve core and the spring are placed in the limit valve seat, and then the limit valve sleeve is placed in the steering nut to abut against the limit valve seat. Finally, the elastic retaining ring for the hole and the flattened steel wire retaining ring for the hole are respectively fastened on the left and right sides of the steering nut. At this time, the limit valve seat is restricted in the steering nut and cannot move axially.

[0009] A further technical solution is that an O-ring is sleeved on the outer circumference of the limit valve seat to increase the sealing effect.

[0010] A further technical solution is that the limit plate is a butterfly-shaped structure, which is convenient for the limit plate to move left and right in the limit valve seat to reduce the contact area. When the right end of the limit valve core conflicts with the two spherical ends of the hexagon socket flat head screw, the limit plate of the butterfly structure will be appropriately tilted to cooperate with the limit plate. Figure 5 As shown, improve adaptability.

[0011] The beneficial effects of the utility model are as follows: the utility model is a repeatedly adjustable power steering travel pressure relief valve structure, a limit valve core which can be moved left and right is built in the limit valve seat, and an inner hexagon flat head screw one and an inner hexagon flat head screw two are installed on the shell. When the steering nut moves left and right in the shell and reaches the upper and lower limits, the inner hexagon flat head screw one and the inner hexagon flat head screw two directly or indirectly push the limit valve core to move left and right in the limit valve seat, so that the oil between the lower chamber of the main cylinder and the upper chamber of the main cylinder is depressurized. The structure is simple, and the pressure relief is stable and durable. The inner hexagon flat head screw one and the inner hexagon flat head screw two can be manually adjusted to meet the need of the left and right movement stroke of the steering nut in the shell, and can be repeatedly adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural schematic diagram of a repeatedly adjustable power steering travel pressure relief valve structure of the utility model;

[0014] Figure 2 It is a schematic diagram of a hexagon socket flat head screw 1 in a repeatedly adjustable power steering travel pressure relief valve structure of the utility model;

[0015] Figure 3 It is a left view of a hexagon socket flat head screw 1 in a repeatedly adjustable power steering travel pressure relief valve structure of the utility model;

[0016] Figure 4 It is a schematic diagram of a repeatedly adjustable power steering travel pressure relief valve structure in which a connecting groove is located in a connecting seat;

[0017] Figure 5 It is a schematic diagram of a repeatedly adjustable power steering travel pressure relief valve structure of the utility model when the steering nut is located at the rightmost upper limit in the housing;

[0018] Figure 6 It is a schematic diagram of a repeatedly adjustable power steering travel pressure relief valve structure of the utility model when the steering nut is located at the leftmost lower limit in the housing.

[0019] Figure 1-6In: 1-hexagon socket flat head screw 1, 2-sealing nut, 3-housing, 4-elastic retaining ring for hole, 5-limit valve seat, 6-steel ball, 7-O-ring, 8-spring, 9-limit valve core, 10-limit valve sleeve, 11-flattened steel wire retaining ring for hole, 12-hexagon socket flat head screw 2, 13-steering nut, 14-master cylinder upper chamber, 15-master cylinder lower chamber, 16-limit plate, 17-oil hole. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0021] See also Figures 1 to 6 As shown, a repeatedly adjustable power steering travel pressure relief valve structure comprises a housing 3 and a steering nut 13 built in the housing 3, a sealing nut 2 is fixed at the left end and the top end of the housing 3, a hexagon socket flat head screw 1 and a hexagon socket flat head screw 2 12 are respectively threadedly connected on the sealing nut 2 and at the left end and the top end of the housing 3, the hexagon socket flat head screw 1 and the hexagon socket flat head screw 2 12 penetrate the housing 3, and the ends extend into the housing 3, the hexagon socket flat head screw 1 and the hexagon socket flat head screw 1 are respectively threadedly connected to the hexagon socket flat head screw 1 The end of the second head screw 12 is a spherical structure, and the steering nut 13 has a built-in limit valve seat 5 and a limit valve sleeve 10. The inner side of the limit valve seat 5 has a steel ball 6 and a limit valve core 9 that can move left and right in the limit valve seat 5. A spring 8 is also placed in the limit valve seat 5 and between the steel ball 6 and the limit valve core 9. The right end of the limit valve core 9 is a conical structure and extends to the outside of the steering nut 13. A limit plate 16 is also fixed to the left end of the limit valve core 9, and at least five oil holes 17 are distributed on the limit plate 16.

[0022] The left end of the spring 8 abuts against the steel ball 6 , and the right end abuts against the limit plate 16 , which can be used to reset the steel ball 6 and the limit plate 16 in the limit valve seat 5 . The steering nut 13 is provided with a hole elastic retaining ring 4 at the left end of the limit valve seat 5, and the steering nut 13 is provided with a hole flattened steel wire retaining ring 11 at the right end of the limit valve sleeve 10. As conventional parts, the left end of the limit valve sleeve 10 abuts against the limit valve seat 5, and the right end abuts against the hole flattened steel wire retaining ring 11, so as to prevent the limit valve seat 5 from moving left and right in the steering nut 13. During installation, the limit valve seat 5 is first placed in the steering nut 13, and then the steel ball 6, the limit valve core 9 and the spring 8 are placed in the limit valve seat 5, and then the limit valve sleeve 10 is placed in the steering nut 13 to abut against the limit valve seat 5. Finally, the left and right sides of the steering nut 13 are respectively provided with the hole elastic retaining ring 4 and the hole flattened steel wire retaining ring 11. At this time, the limit valve seat 5 is restricted in the steering nut 13 and cannot move axially. The outer circumference of the limit valve seat 5 is also sleeved with an O-ring 7 to increase the sealing effect. The limit plate 16 is a butterfly-shaped structure, which is convenient for the limit plate 16 to move left and right in the limit valve seat 5 to reduce the contact area. When the right end of the limit valve core 9 contacts the spherical end of the hexagon socket flat head screw 12, the limit plate 16 of the butterfly structure will be appropriately tilted to cooperate with the limit plate 16. Figure 5 As shown, improve adaptability.

[0023] In this embodiment, if Figure 5 As shown, in the housing 3, when the steering nut 13 reaches the rightmost end, the pressure relief valve core 9 moves to the upper limit to the right along with the steering nut 13, and the right conical structure end of the pressure relief valve core 9 contacts the spherical bottom end of the hexagon socket flat head screw 12, so that the high-pressure part of the oil in the lower chamber 15 of the master cylinder enters from B and flows out from A, and the pressure relief valve core 9 gradually changes position, so that the oil in the lower chamber 15 of the master cylinder quickly passes through the steel ball 6, the spring 8, the pressure relief valve core 9 and the oil hole 17 to reach the upper chamber 14 of the master cylinder, so that the residual pressure in the lower chamber 15 of the master cylinder is maintained at about 3-5MPa, so as to help the driver complete the steering action, as shown in FIG. Figure 6 As shown, when the steering nut 13 moves to the left to the lower limit, the pressure relief valve core 9 moves to the left along with the steering nut 13, and the steel ball 6 in the pressure relief valve core 9 on the steering nut 13 is slowly pushed open by the hexagonal flat head screw 1 of the housing, so that the high-pressure part of the oil in the upper chamber 14 of the housing enters from point A and flows out from point B, so that the oil in the upper chamber 14 of the master cylinder quickly passes through the pressure relief valve core 9, the spring 8, the steel ball 6 and the oil through hole 17 to reach the lower chamber 15 of the master cylinder, so that the residual pressure in the upper chamber 14 of the master cylinder is maintained at about 3-5MPa, so as to help the driver complete the steering action and relieve the pressure of the hydraulic system. After the above steps, an action cycle of the unloading valve is completed, and the hexagonal flat head screw 1 and the hexagonal flat head screw 2 12 are threadedly connected to the sealing nut 2, and the length of the hexagonal flat head screw 1 and the hexagonal flat head screw 2 12 of the housing 3 can be adjusted by manual rotation to meet the needs of the left and right movement stroke of the steering nut 13 in the housing 3, and can be adjusted repeatedly.

[0024] The above are only specific implementation methods of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present utility model.

Claims

1. A repeatedly adjustable power steering travel pressure relief valve structure, comprising a housing and a steering nut built in the housing, characterized in that: A sealing nut is fixed to the left end and the top end of the shell, and a hexagon socket flat head screw 1 and a hexagon socket flat head screw 2 are threadedly connected to the sealing nut and located at the left end and the top end of the shell respectively. The hexagon socket flat head screw 1 and the hexagon socket flat head screw 2 penetrate the shell, and the ends extend into the shell. The ends of the hexagon socket flat head screw 1 and the hexagon socket flat head screw 2 are spherical structures. The steering nut has a built-in limit valve seat and a limit valve sleeve. A steel ball and a limit valve core that can move left and right in the limit valve seat are built-in inside the limit valve seat. A spring is also placed in the limit valve seat and between the steel ball and the limit valve core. The right end of the limit valve core is a conical structure and extends to the outside of the steering nut. A limit plate is also fixed to the left end of the limit valve core, and at least five oil holes are distributed on the limit plate.

2. A repeatably adjustable power steering travel pressure relief valve structure according to claim 1, characterized in that: The left end of the spring abuts against the steel ball, and the right end abuts against the limit plate.

3. A repeatably adjustable power steering travel pressure relief valve structure according to claim 1, characterized in that: An elastic retaining ring for a hole is also buckled in the steering nut at the left end of the limit valve seat, and a flattened steel wire retaining ring for a hole is also buckled in the steering nut at the right end of the limit valve sleeve.

4. A repeatably adjustable power steering travel pressure relief valve structure according to claim 1, characterized in that: An O-ring is also sleeved on the outer circumference side of the limit valve seat.

5. The repeatedly adjustable power steering travel pressure relief valve structure according to claim 1, characterized in that: The limiting plate has a butterfly-shaped structure.

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