Relief valve for shock absorber, and shock absorber

Abstract

The present invention relates to the technical field of vehicles, and provides a relief valve for a shock absorber, and a shock absorber. The relief valve for a shock absorber comprises: a valve body; a hydraulic assembly, which is arranged in the valve body and comprises: a valve sleeve provided with a main valve cavity and an auxiliary valve cavity, a valve core located in the auxiliary valve cavity, a first elastic element located between the valve sleeve and the valve core, and a second elastic element connected to the valve core; and an electromagnetic assembly, wherein an output end of the electromagnetic assembly abuts against the second elastic element. According to the present invention, the sealing performance of the relief valve can be improved, requirements for part assembly are reduced, and the economy of the product is improved.

Description

Overflow valve of shock absorber and shock absorber Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a relief valve of a shock absorber and a shock absorber. Background Art

[0002] The relief valve is a hydraulic pressure control valve that primarily functions as a constant-pressure relief valve, pressure stabilization, system unloading, and safety protection. It can be used in active shock absorbers for automobiles. Active shock absorbers can use the relief valve to form a hydraulic cylinder with controllable damping, allowing the vehicle to adapt to various road conditions. In the prior art, the valve port of the relief valve is formed by a valve seat and a leaf spring. This structure places high demands on the verticality of parts assembly, increasing assembly costs. Furthermore, during the operation of the relief valve, the push rod pushes the valve core to move. The valve core must first overcome the spring force, and then overcome the leaf spring force as it approaches the valve port. This results in poor consistency in the resultant force acting on the valve core, resulting in poor pressure control accuracy of the relief valve.

[0003] Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a relief valve for a shock absorber and a shock absorber, so as to solve the problems of high assembly requirements and poor pressure control accuracy of the relief valve in the prior art.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a relief valve for a shock absorber, comprising:

[0006] Valve body;

[0007] A hydraulic assembly is provided in the valve body, and the hydraulic assembly includes:

[0008] The valve sleeve is provided with a main valve cavity and an auxiliary valve cavity;

[0009] a valve core, located in the auxiliary valve cavity;

[0010] a first elastic element, located between the valve sleeve and the valve core;

[0011] A second elastic element connected to the valve core; and

[0012] The electromagnetic component has an output end abutting against the second elastic element.

[0013] In one embodiment of the present invention, the valve sleeve is provided with an oil through hole, and the oil through hole connects the main valve chamber and the auxiliary valve chamber.

[0014] In one embodiment of the present invention, the auxiliary valve chamber is provided with a first valve sleeve end surface, wherein the electromagnetic assembly pushes the second elastic element to drive the valve core to move toward the first valve sleeve end surface.

[0015] In one embodiment of the present invention, the valve core is provided with a pilot cavity, which passes through the valve core, the cavity mouth end of the pilot cavity is located on the side away from the end face of the first valve sleeve, and the cavity bottom end of the pilot cavity is located on the side close to the end face of the first valve sleeve.

[0016] In one embodiment of the present invention, the second elastic element is located on the side of the upper cavity end of the valve core, and there is a gap between the second elastic element and the cavity end to form a valve port. After the electromagnetic component pushes the valve core to contact the end face of the first valve sleeve, it continues to push to cause the second elastic element to deform to close the valve port.

[0017] In one embodiment of the present invention, the cross-sectional area of ​​the cavity opening is greater than the cross-sectional area of ​​the cavity bottom.

[0018] In one embodiment of the present invention, an annular groove is provided on the radial outer side of the first valve sleeve end surface to form a second valve sleeve end surface, and one end of the first elastic element abuts against the second valve sleeve end surface.

[0019] In one embodiment of the present invention, an annular groove is provided on one side of the valve core close to the first valve sleeve end surface to form a first valve core end surface, and the other end of the first elastic element abuts against the first valve core end surface.

[0020] In one embodiment of the present invention, the hydraulic assembly further includes a fixing sleeve, the fixing sleeve and the valve core are interference fit, and the second elastic element is located between the fixing sleeve and the valve core.

[0021] The present invention also provides a shock absorber, comprising the overflow valve of the shock absorber as described in any one of the above.

[0022] As described above, the overflow valve and shock absorber of the shock absorber of the present invention have the following beneficial effects: the present invention can improve the sealing performance of the overflow valve, and at the same time the present invention can reduce the parts assembly process, lower the parts assembly requirements, and improve the product economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a cross-sectional view of a relief valve of a shock absorber according to the present invention.

[0024] FIG. 2 is a perspective view of a valve sleeve according to an embodiment of the present invention.

[0025] FIG3 is a cross-sectional view of a valve core according to an embodiment of the present invention.

[0026] FIG. 4 is a schematic diagram showing the connection between the second elastic element and the valve core in one embodiment of the present invention.

[0027] FIG. 5 is another schematic diagram showing the connection between the second elastic element and the valve core in one embodiment of the present invention.

[0028] FIG. 6 shows another schematic diagram of the connection between the second elastic element and the valve core in one embodiment of the present invention.

[0029] Component number description:

[0030] 100, valve sleeve; 110, main valve chamber; 111, oil hole; 120, auxiliary valve chamber; 121, first valve sleeve end face; 122, second valve sleeve end face; 130, oil hole;

[0031] 200, valve core; 210, pilot cavity; 211, cavity mouth; 212, cavity bottom; 220, first valve core end face; 230, second valve core end face; 240, third valve core end face;

[0032] 300, first elastic element;

[0033] 400, second elastic element; 401, riveting point; 402, through groove;

[0034] 500, electromagnetic push rod;

[0035] 600, fixed sleeve. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following examples and the features in the examples can be combined with each other unless they conflict. It should also be understood that the terms used in the examples of the present invention are for the purpose of describing specific embodiments, not for the purpose of limiting the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0037] Please refer to Figures 1 to 6. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0038] Referring to Figures 1 to 6 , the present invention provides a shock absorber relief valve and shock absorber, which can be applied in the automotive field, specifically in automotive shock absorption systems. This invention ensures vertical assembly of parts, reduces assembly requirements, and improves product cost-effectiveness. A detailed description is provided below using specific embodiments.

[0039] Please refer to Figure 1, which shows a cross-sectional view of a shock absorber relief valve according to the present invention. In one embodiment of the present invention, the shock absorber relief valve may include a valve body, an electromagnetic assembly, and a hydraulic assembly. The hydraulic assembly may be disposed within the valve body, and the output end of the electromagnetic assembly may abut the hydraulic assembly. In this embodiment, the hydraulic pressure of the relief valve can be proportionally controlled by controlling the electromagnetic force generated by the electromagnetic assembly.

[0040] Referring to Figure 1 , in one embodiment of the present invention, a hydraulic assembly may include a valve sleeve 100, a valve core 200, a first elastic element 300, and a second elastic element 400. The valve sleeve 100 may be provided with a main valve chamber 110 and a secondary valve chamber 120. The valve core 200 may be located within the secondary valve chamber 120 and may be provided with a pilot chamber 210. The outer surface of the valve core 200 and the inner surface of the secondary valve chamber 120 may form a clearance fit. The first elastic element 300 may be located between the valve sleeve 100 and the valve core 200. The first elastic element 300 may be a cylindrical coil spring. The second elastic element 400 may be connected to the valve core 200 and may be a circular leaf spring. The second elastic element 400 is located at one end of the pilot chamber 210 to form a valve port; the other end of the pilot chamber 210 may face the oil passage 130. The output end of the electromagnetic assembly may be an electromagnetic push rod 500 . The electromagnetic push rod 500 abuts against the second elastic element 400 . The electromagnetic push rod 500 may push the second elastic element 400 and drive the valve core 200 to move axially.

[0041] Please refer to Figure 2, which shows a three-dimensional schematic diagram of the valve sleeve 100 in one embodiment of the present invention. In one embodiment of the present invention, the valve sleeve 100 can be a rotating body structure, and the main valve chamber 110 and the auxiliary valve chamber 120 can both be cylindrical cavities. Among them, the axis of the main valve chamber 110 and the axis of the auxiliary valve chamber 120 can be located on the same straight line. In this embodiment, a plurality of oil holes 111 can be evenly opened on the side wall of the main valve chamber 110, and high-pressure oil can enter the main valve chamber 110 through the oil holes 111. The valve sleeve 100 is also provided with an oil hole 130, and the number of the oil holes 130 can be one or more. The oil hole 130 can connect the main valve chamber 110 and the auxiliary valve chamber 120, and the oil in the main valve chamber 110 can enter the auxiliary valve chamber 120 through the oil hole 130.

[0042] Referring to Figures 1 and 2 , in one embodiment of the present invention, the auxiliary valve chamber 120 is provided with a first valve sleeve end face 121. The first valve sleeve end face 121 may be a circular end face, the center of which may be located on the axis of the auxiliary valve chamber 120. The ports of a plurality of oil holes 130 may be located within the first valve sleeve end face 121, and the plurality of oil holes 130 may be centrally symmetrically distributed about the center of the first valve sleeve end face 121. An annular groove may be provided radially outwardly of the first valve sleeve end face 121, thereby forming a second valve sleeve end face 122. One end of the first elastic element 300 may abut the second valve sleeve end face 122. Thus, it can be seen that the second valve sleeve end face 122 and the annular groove can form axial and radial limits for one end of the first elastic element 300.

[0043] Please refer to Figure 3, which shows a cross-sectional view of a valve core 200 according to one embodiment of the present invention. In one embodiment of the present invention, an annular groove may be provided on the side of the valve core 200 proximal to the first valve sleeve end face 121, thereby forming a first valve core end face 220. In this embodiment, the position of the first valve core end face 220 may correspond to the position of the first valve sleeve end face 121, and the other end of the first elastic element 300 may abut the first valve core end face 220. As can be seen, the first valve core end face 220 and the annular groove can limit the other end of the first elastic element 300 in both axial and radial directions.

[0044] Referring to Figure 3 , in one embodiment of the present invention, a pilot chamber 210 may extend through the valve core 200. The pilot chamber's opening end 211 may be located away from the first valve sleeve end face 121, while the pilot chamber's bottom end 212 may be located closer to the first valve sleeve end face 121. A second elastic element 400 may be located at the end of the opening end 211, thereby forming a valve port. In this embodiment, along the radial direction of the pilot chamber 210, the cross-sectional area of ​​the opening end 211 is greater than the cross-sectional area of ​​the bottom end 212. In other words, the pilot chamber 210 is funnel-shaped, with its diameter gradually decreasing from the opening end 211 to the bottom end 212. Therefore, during operation of the hydraulic assembly of the present invention, when a pressure surge occurs, the high-pressure oil flowing into the pilot chamber 210 can exert an axial force on the valve core 200, thereby pressing the valve core 200 against the first valve sleeve end face 121. This structural design prevents additional leakage, thereby improving product stability.

[0045] Referring to Figure 3 , in one embodiment of the present invention, the outer side of the port at the cavity opening end 211 may be the second valve core end face 230 of the valve core 200, and the outer side of the port at the cavity bottom end 212 may be the third valve core end face 240 of the valve core 200. A gap exists between the cavity opening end 211 and the second elastic element 400, that is, a gap may exist between the second valve core end face 230 and the second elastic element 400, forming a valve port. In this embodiment, the electromagnetic push rod 500 pushes the second elastic element 400, which in turn drives the valve core 200 toward the first valve sleeve end face 121. When the port of the cavity bottom end 212 contacts the first valve sleeve end face 121, that is, the third valve core end face 240 contacts the first valve sleeve end face 121, the electromagnetic push rod 500 will continue to push and compress the second elastic element 400 to cause the second elastic element 400 to deform and contact the port of the cavity mouth end 211, that is, the deformed second elastic element 400 contacts the second valve core end face 230, thereby closing the valve port of the pilot cavity 210.

[0046] Please refer to Figure 4, which shows a schematic diagram of the connection between the second elastic element 400 and the valve core 200 in one embodiment of the present invention. In one embodiment of the present invention, the second elastic element 400 and the valve core 200 can be connected by riveting. At the connection between the second elastic element 400 and the valve core 200, multiple rivet points 401 can be evenly arranged along the circumference to restrict the axial movement of the second elastic element 400 along the valve core 200. In this embodiment, multiple through-slots 402 are defined in the second elastic element 400 to adjust the rigidity of the second elastic element 400. When the electromagnetic push rod 500 acts on the center of the second elastic element 400, the edge portion of the second elastic element 400 remains stationary relative to the valve core 200, while the center portion deforms, thereby driving the valve core 200 to move along the axial direction and closing the valve port of the pilot chamber 210.

[0047] Please refer to Figure 5, which shows another schematic diagram of the connection between the second elastic element 400 and the valve core 200 in one embodiment of the present invention. In one embodiment of the present invention, the hydraulic assembly further includes a fixing sleeve 600. The fixing sleeve 600 can form an interference fit with the valve core 200, with the fitting surfaces being the outer circumferential surface of the fixing sleeve 600 and the inner circumferential surface of the valve core 200. In this embodiment, the second elastic element 400 can be positioned between the end surface of the fixing sleeve 600 and the second valve core end surface 230 of the valve core 200. Therefore, it can be seen that the fixing sleeve 600 can secure the second elastic element 400 to the valve core 200.

[0048] Please refer to Figure 6, which shows another schematic diagram of the connection between the second elastic element 400 and the valve core 200 in one embodiment of the present invention. In one embodiment of the present invention, the fixing sleeve 600 can form an interference fit with the valve core 200, and the mating surfaces can be the inner circumferential surface of the fixing sleeve 600 and the outer circumferential surface of the valve core 200. In this embodiment, the outer circumferential surface of the fixing sleeve 600 can form a clearance fit with the inner circumferential surface of the auxiliary valve chamber 120. The end of the fixing sleeve 600 near the second valve core end surface 230 can be provided with a step, and the second elastic element 400 is located between the step and the second valve core end surface 230. Therefore, it can be seen that the fixing sleeve 600 can fix the second elastic element 400 to the valve core 200.

[0049] In one embodiment of the present invention, the second elastic element 400 and the valve core 200 can also be connected by welding, interference fit, etc. For example, the second elastic element 400 is directly welded to the valve core 200, or the second elastic element 400 is directly formed with the inner circular surface of the valve core 200 to form an interference fit.

[0050] Referring to Figures 1 to 3 , in one embodiment of the present invention, during operation of the hydraulic assembly, the electromagnetic push rod 500 first acts on the second elastic element 400, thereby pushing the valve core 200 to overcome the spring force of the first elastic element 300 and press the valve core 200 against the first valve core end surface 220. The second elastic element 400, under the continued thrust of the electromagnetic push rod 500, deforms and contacts the second valve core end surface 230, thereby closing the valve port of the pilot chamber 210. Oil can enter the pilot chamber 210 from the main valve chamber 110 through the oil passage. When the oil pressure overcomes the force of the electromagnetic push rod 500, the second elastic element 400 rebounds, opening the valve port of the pilot chamber 210 and allowing overflow. The pressure in the pilot chamber 210 decreases until the forces acting on the second elastic element 400 are balanced, at which point the valve port of the pilot chamber 210 stabilizes and maintains a constant pressure.

[0051] As can be seen, during operation, the valve core 200 is pushed by the force of the electromagnetic push rod 500 until it contacts the first valve sleeve end face 121. The gap between the second elastic element 400 and the second valve core end face 230 forms the valve port of the pilot chamber 210. The pressure controlled by the valve port is determined solely by the force of the electromagnetic push rod 500 and the elastic force of the second elastic element 400. The elastic force of the first elastic element 300 does not participate in the pressure balance. Therefore, by adjusting the force of the electromagnetic push rod 500, the oil pressure can be adjusted, thereby achieving proportional control of the oil pressure. This invention can improve the consistency of the valve port control pressure and enhance the precision of the product.

[0052] The present invention also provides a shock absorber that may include the aforementioned shock absorber relief valve. The shock absorber utilizes the relief valve to adjust the pressure in the hydraulic system according to the load. Specifically, the shock absorber utilizes the relief valve to adjust parameters such as resistance characteristics, amplitude, and stroke to adapt to various road conditions.

[0053] In summary, the present invention provides a shock absorber relief valve and shock absorber, relating to the field of hydraulic technology. By integrating the valve seat into the valve core, the present invention reduces the number of hydraulic components in the relief valve. This invention ensures vertical assembly of parts, reduces the number of assembly steps, lowers assembly requirements, and improves product cost-effectiveness. Therefore, the present invention effectively overcomes the shortcomings of the prior art and possesses high industrial value.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

[0055] In the description herein, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, assemblies, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0056] The above description of the illustrated embodiments of the present invention (including that described in the Abstract) is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, as those skilled in the art will recognize and appreciate, various equivalent modifications are possible within the spirit and scope of the present invention. As noted, modifications may be made to the present invention in light of the above description of the illustrated embodiments of the present invention, and such modifications will be within the spirit and scope of the present invention.

Claims

1. A relief valve for a shock absorber, characterized in that: include: Valve body; A hydraulic assembly is disposed in the valve body, and the hydraulic assembly includes: A valve sleeve, provided with a main valve chamber and an auxiliary valve chamber; A valve core is located in the auxiliary valve cavity; A first elastic element, located between the valve sleeve and the valve core; A second elastic element connected to the valve core; and The electromagnetic component has an output end abutting against the second elastic element.

2. The relief valve of the shock absorber according to claim 1, characterized in that: The valve sleeve is provided with an oil through hole, and the oil through hole connects the main valve cavity and the auxiliary valve cavity.

3. The relief valve of the shock absorber according to claim 1, characterized in that: The auxiliary valve chamber is provided with a first valve sleeve end surface, wherein the electromagnetic assembly pushes the second elastic element to drive the valve core to move toward the first valve sleeve end surface.

4. The relief valve of the shock absorber according to claim 3, characterized in that: The valve core is provided with a pilot cavity, which runs through the valve core, the cavity mouth end of the pilot cavity is located at a side away from the end face of the first valve sleeve, and the cavity bottom end of the pilot cavity is located at a side close to the end face of the first valve sleeve.

5. The relief valve of the shock absorber according to claim 4, characterized in that: The second elastic element is located on one side of the cavity end of the valve core, and there is a gap between the second elastic element and the cavity end to form a valve port. After the electromagnetic component pushes the valve core to contact the end surface of the first valve sleeve, it continues to push to cause the second elastic element to deform to close the valve port.

6. The relief valve of the shock absorber according to claim 4, characterized in that: The cross-sectional area of ​​the cavity opening end is greater than the cross-sectional area of ​​the cavity bottom end.

7. The relief valve of the shock absorber according to claim 3, characterized in that: An annular groove is provided on the radial outer side of the first valve sleeve end surface to form a second valve sleeve end surface, and one end of the first elastic element abuts against the second valve sleeve end surface.

8. The relief valve of the shock absorber according to claim 7, characterized in that: An annular groove is provided on one side of the valve core close to the end surface of the first valve sleeve to form a first valve core end surface, and the other end of the first elastic element abuts against the first valve core end surface.

9. The relief valve of the shock absorber according to claim 1, characterized in that: The hydraulic assembly further comprises a fixing sleeve, the fixing sleeve is interference-fitted with the valve core, and the second elastic element is located between the fixing sleeve and the valve core.

10. A shock absorber, characterized in that: The invention comprises a relief valve of a shock absorber as claimed in any one of claims 1 to 9.

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