External check valve type double-valve shock absorber and check valve thereof

Abstract

The utility model discloses an external check valve type double-valve shock absorber and a check valve thereof. The external check valve type double-valve shock absorber comprises a shock absorber main body, a compression solenoid valve; the springback integrated valve comprises a springback electromagnetic valve, a check valve and a springback valve seat, the springback electromagnetic valve and the check valve are both installed in the springback valve seat, the output end of the springback electromagnetic valve is communicated with the oil storage cylinder through the springback valve seat, and the input end of the springback electromagnetic valve is communicated with the springback middle cylinder through the check valve; the check valve includes: a check valve seat provided with a cover through hole; the check valve cover covers the check valve seat and is matched with the check valve seat to form a check valve cavity, a seat through hole is formed in the check valve seat, and the cover through hole and the seat through hole are both communicated with the check valve cavity; the elastic check valve element is installed in the check valve cavity, a plurality of bypass holes are formed in the check valve cover at intervals in the circumferential direction of the check valve cover, and the elastic check valve element can block the bypass holes through the elastic force of the elastic check valve element. The assembly between the rebound middle cylinder and the oil storage cylinder is not influenced, the installation of the check valve is simplified, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorbers, and particularly to an external check valve double-valve shock absorber and a check valve thereof. Background Art

[0002] Automobile shock absorbers are used to provide riding comfort and handling stability. By reducing vibrations and bumps during vehicle driving, they keep the vehicle body stable and provide good suspension system control. With the continuous development of the automobile industry, since double-valve shock absorbers can adjust the damping force during the rebound process by using a rebound solenoid valve and adjust the damping force during the compression process by using a compression solenoid valve, they have been widely used in the vehicle suspension system.

[0003] For the double-valve shock absorbers in the prior art, a check valve needs to be arranged on the working cylinder and hermetically connected to a rebound intermediate cylinder sleeved on the working cylinder, resulting in an increase in the overall outer diameter and making it difficult to be installed in the oil storage cylinder. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an external check valve double-valve shock absorber and a check valve thereof, so as to solve the technical problem that for the current double-valve shock absorbers, the check valve is arranged on the working cylinder and hermetically connected to the rebound intermediate cylinder sleeved on the working cylinder, resulting in an increase in the overall outer diameter and making it difficult to be installed in the oil storage cylinder.

[0005] The above purpose of the utility model can be achieved by adopting the following technical solutions:

[0006] The utility model provides an external check valve double-valve shock absorber, comprising: a shock absorber main body; a compression solenoid valve installed on the oil storage cylinder of the shock absorber main body and communicating with the oil storage cylinder and the compression intermediate cylinder of the shock absorber main body; a rebound integrated valve, including a rebound solenoid valve, a check valve and a rebound valve seat, the rebound valve seat is installed on the oil storage cylinder, the rebound solenoid valve and the check valve are both installed in the rebound valve seat, the output end of the rebound solenoid valve is communicated with the oil storage cylinder through the rebound valve seat, and the input end of the rebound solenoid valve is communicated with the rebound intermediate cylinder of the shock absorber main body through the check valve; wherein, the check valve includes a check valve seat, a check valve cover and an elastic check valve core; a cover through hole is provided on the check valve cover, the check valve cover is hermetically connected with the input end of the rebound solenoid valve and communicated with the input end of the rebound solenoid valve through the cover through hole, the check valve cover covers the check valve seat and cooperates to form a check valve cavity, a seat through hole is provided on the check valve seat, and both the cover through hole and the seat through hole are communicated with the check valve cavity; the check valve seat extends out of the rebound valve seat and is hermetically connected with the rebound intermediate cylinder, and the check valve seat is communicated with the rebound intermediate cylinder through the seat through hole; the elastic check valve core is installed in the check valve cavity, and a plurality of side through holes are arranged at intervals along the circumferential direction of the check valve cover, and the elastic check valve core can block the side through holes by its own elastic force.

[0007] In an embodiment of the utility model, during the compression process of the piston rod mechanism of the shock absorber main body, a compression oil circuit is formed between the rebound integrated valve and the shock absorber main body through the check valve. The oil in the oil storage cylinder flows into the rebound valve seat and overcomes the elastic force of the elastic check valve core to flow into the check valve cavity from the side through holes, and then flows into the rebound intermediate cylinder through the seat through hole, thereby forming the compression oil circuit; during the rebound process of the piston rod mechanism, a rebound oil circuit is formed between the rebound integrated valve and the shock absorber main body through the check valve. The oil in the rebound intermediate cylinder flows through the seat through hole, the check valve cavity and the cover through hole in sequence, then flows into the input end of the rebound solenoid valve and flows out from the output end of the rebound solenoid valve, and then flows into the oil storage cylinder from the rebound valve seat, thereby forming the rebound oil circuit.

[0008] In an embodiment of the utility model, the rebound valve seat has a first open end, the first open end is installed on the oil storage cylinder and communicated with the oil storage cylinder, an inner limiting part is provided on the inner side of the first open end, the check valve seat is provided with a plurality of limiting convex platforms, the plurality of limiting convex platforms are arranged at intervals and abut against one side surface of the inner limiting part close to the check valve cover, and the gap spaces between the plurality of limiting convex platforms form a plurality of flow channels communicating the rebound valve seat and the oil storage cylinder.

[0009] In an embodiment of the present utility model, the check valve seat is provided with a limiting plate. The limiting plate has opposite first limiting surface and second limiting surface in the axial direction of the check valve. A plurality of the limiting bosses are arranged on the first limiting surface, and the check valve cover abuts against the second limiting surface along the axial direction of the check valve.

[0010] In an embodiment of the present utility model, a first joint is provided on the second limiting surface. The check valve cover is sleeved on the first joint along the axial direction of the check valve and cooperates to form the check valve cavity, and the first joint and the check valve cover are hermetically connected through a first sealing structure.

[0011] In an embodiment of the present utility model, the first sealing structure includes a first sealing ring and a first sealing groove. The first sealing groove is formed on the outer wall surface of the first joint, and the first sealing ring is installed in the first sealing groove and abuts against the second limiting surface.

[0012] In an embodiment of the present utility model, the check valve cover abuts against the end face of the input end of the return spring solenoid valve along its axial direction, and the check valve cover and the return spring solenoid valve are hermetically connected through a second sealing structure. The second sealing structure includes a second sealing groove and a second sealing ring. The second sealing groove is formed on the check valve cover along the circumferential direction of the check valve cover and is located outside the cover through hole, and the second sealing ring is installed in the second sealing groove.

[0013] In an embodiment of the present utility model, the return intermediate cylinder is provided with an internal return interface, and the internal return interface is communicated with the inner cavity of the return intermediate cylinder. The check valve seat is provided with a second joint, and the second joint is inserted into the internal return interface and hermetically connected through a third sealing structure.

[0014] In an embodiment of the present utility model, the third sealing structure includes a third sealing ring and a third sealing groove. The third sealing groove is formed on the inner wall surface of the internal return interface, and the third sealing ring is installed in the third sealing groove.

[0015] In an embodiment of the present utility model, the side through hole is located at one end where the check valve cover is connected to the input end of the return spring solenoid valve. The axis of the side through hole is arranged parallel to the axis of the check valve, or the axis of the side through hole is inclined from the input end to the output end towards the axis of the check valve.

[0016] In an embodiment of the present utility model, the elastic check valve core is a corrugated spring, and the elastic check valve core is elastically telescopicly arranged in the check valve cavity along the axial direction of the check valve cover.

[0017] The present utility model further provides a check valve, which is applied to the above-mentioned check-valve external double-valve shock absorber. The check valve includes: a check-valve seat provided with a cover through-hole; a check-valve cover covering the check-valve seat and cooperating to form a check-valve cavity. The check-valve seat is provided with a seat through-hole, and both the cover through-hole and the seat through-hole are communicated with the check-valve cavity; an elastic check-valve core installed in the check-valve cavity. A plurality of side through-holes are arranged at intervals along the circumferential direction of the check-valve cover, and the elastic check-valve core can block the side through-holes by its own elastic force.

[0018] The characteristics and advantages of the present utility model are as follows:

[0019] For the check-valve external double-valve shock absorber of the present utility model, by integrating the rebound solenoid valve and the check valve into the rebound valve seat, it will not affect the assembly accuracy between the rebound intermediate cylinder and the oil storage cylinder, avoiding the difficulty of installing the rebound intermediate cylinder into the oil storage cylinder due to the check valve being sleeved on the rebound intermediate cylinder, and simplifying the installation of the check valve.

[0020] For the check-valve external double-valve shock absorber and its check valve of the present utility model, the check-valve cover covers the check-valve seat and cooperates to form a check-valve cavity. The elastic check-valve core installed in the check-valve cavity blocks the side through-holes on the check-valve cover during the rebound process, so that the oil in the rebound intermediate cylinder cannot flow into the oil storage cylinder through the side through-holes of the check valve during the rebound process. Since the check-valve seat is connected to the rebound intermediate cylinder and the check-valve cover is connected to the output end of the rebound solenoid valve, the check valve structure is compact. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a longitudinal sectional view of the check-valve external double-valve shock absorber in the present utility model.

[0023] Figure 2 It is a structural schematic diagram of the rebound integrated valve in the present utility model.

[0024] Figure 3 It is a schematic diagram of the compression oil circuit in the present utility model.

[0025] Figure 4 It is a schematic diagram of the rebound oil circuit in the present utility model.

[0026] Figure 5 It is a three-dimensional schematic diagram of the check valve in the present utility model.

[0027] Figure 6 This is a longitudinal sectional view of the check valve of the present utility model.

[0028] In the figure:

[0029] 1. Rebound integrated valve;

[0030] 11. Check valve;

[0031] 111. Check valve seat; 1111. Seat through hole; 1112. Limit boss; 1113. Limit plate; 1114. First limit surface; 1115. Second limit surface; 1116. First joint; 1117. Second joint; 1118. Flow passage;

[0032] 112. Check valve cover; 1121. Side through hole; 1122. Cover through hole; 1123. Inner sealing convex ring; 1124. Outer sealing convex ring;

[0033] 113. Elastic check valve core; 1131. Wave spring; 1132. Valve disc;

[0034] 114. Check valve cavity;

[0035] 115. First sealing structure; 1151. First sealing ring; 1152. First sealing groove;

[0036] 116. Second sealing structure; 1161. Second sealing ring; 1162. Second sealing groove;

[0037] 117. Third sealing structure; 1171. Third sealing ring; 1172. Third sealing groove;

[0038] 12. Rebound solenoid valve; 121. Input end; 122. Output end;

[0039] 13. Rebound valve seat; 131. Inner limit part; 132. Outer limit part; 133. First open end; 134. Second open end;

[0040] 2. Cylinder body mechanism; 21. Oil storage cylinder; 211. Outer rebound interface; 22. Working cylinder; 221. Upper working cavity; 222. Lower working cavity; 23. Rebound intermediate cylinder; 231. Inner rebound interface; 24. Compression intermediate cylinder;

[0041] 3. Piston rod mechanism; 31. Piston end; 32. Rod end;

[0042] 41. Compression solenoid valve; 42. Compression valve seat. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0044] Embodiment 1

[0045] As Figure 1 shown, the present utility model provides an external check valve double-valve shock absorber, which includes a shock absorber main body.

[0046] Among them, the shock absorber main body includes a cylinder body mechanism 2 and a piston rod mechanism 3. The cylinder body mechanism 2 includes an oil storage cylinder 21, a working cylinder 22, a rebound intermediate cylinder 23, and a compression intermediate cylinder 24. The working cylinder 22 is installed in the oil storage cylinder 21. The piston end 31 of the piston rod mechanism 3 is sealingly and slidably arranged in the working cylinder 22 and divides the inner cavity of the working cylinder 22 into an upper working cavity 221 and a lower working cavity 222. The rod end 32 of the piston rod mechanism 3 passes through the upper working cavity 221 and extends outside the oil storage cylinder 21. The rebound intermediate cylinder 23 is sealingly sleeved on the working cylinder 22 and is communicated with the upper working cavity 221 of the working cylinder 22. The compression intermediate cylinder 24 is sealingly sleeved on the working cylinder 22 and is communicated with the lower working cavity 222 of the working cylinder 22.

[0047] The external check valve double-valve shock absorber of the present utility model further includes: a compression solenoid valve 41, which is installed on the oil storage cylinder 21 and is communicated with the oil storage cylinder 21 and the compression intermediate cylinder 24; a rebound integrated valve 1, which includes a rebound solenoid valve 12, a check valve 11, and a rebound valve seat 13. The rebound valve seat 13 is installed on the oil storage cylinder 21. Both the rebound solenoid valve 12 and the check valve 11 are installed in the rebound valve seat 13. The output end 122 of the rebound solenoid valve 12 is communicated with the oil storage cylinder 21 through the rebound valve seat 13. The input end 121 of the rebound solenoid valve 12 is communicated with the rebound intermediate cylinder 23 through the check valve 11.

[0048] For the external check valve double-valve shock absorber of the present utility model, by integrating the rebound solenoid valve 12 and the check valve 11 into the rebound valve seat 13, it will not affect the assembly accuracy between the rebound intermediate cylinder 23 and the oil storage cylinder 21, and avoid the difficulty of installing the rebound intermediate cylinder 23 into the oil storage cylinder 21 caused by sleeving the check valve 11 on the rebound intermediate cylinder 23, and simplifies the installation of the check valve 11.

[0049] Among them, as Figure 2As shown in the figure, the check valve 11 includes a check valve seat 111, a check valve cover 112, and an elastic check valve core 113; a cover through-hole 1122 is provided on the check valve cover 112. The check valve cover 112 is hermetically connected to the input end 121 of the return spring solenoid valve 12 and communicates with the input end 121 of the return spring solenoid valve 12 through the cover through-hole 1122. The check valve cover 112 covers the check valve seat 111 and cooperates to form a check valve cavity 114. A seat through-hole 1111 is provided on the check valve seat 111. Both the cover through-hole 1122 and the seat through-hole 1111 communicate with the check valve cavity 114. The check valve seat 111 extends from the return spring seat 13 and is hermetically connected to the return spring intermediate cylinder 23, and the check valve seat 111 communicates with the return spring intermediate cylinder 23 through the seat through-hole 1111. The elastic check valve core 113 is installed in the check valve cavity 114. A plurality of side through-holes 1121 are arranged at intervals along the circumferential direction of the check valve cover 112. The elastic check valve core 113 can block the side through-holes 1121 by its own elastic force.

[0050] For the check valve external double-valve shock absorber of the present utility model, the check valve cover 112 covers the check valve seat 111 to cooperate to form a check valve cavity 114. The elastic check valve core 113 installed in the check valve cavity 114 blocks the side through-holes 1121 on the check valve cover 112 during the return process, so that the oil in the return spring intermediate cylinder 23 cannot flow into the oil storage cylinder 21 from the side through-holes 1121 of the check valve 11 during the return process. Since the check valve seat 111 is connected to the return spring intermediate cylinder 23, and the check valve cover 112 is connected to the output end 122 of the return spring solenoid valve 12, the structure of the check valve 11 is compact.

[0051] In addition, since the check valve seat 111 extends into the oil storage cylinder 21 and is connected to the return spring intermediate cylinder 23, by providing the side through-holes 1121 on the check valve cover 112, the check valve seat 111 will not cause a reduction in its structural strength due to the opening of the side through-holes 1121. Therefore, there is no need to increase the thickness to ensure its structural strength, which is beneficial to reducing the manufacturing cost of the check valve seat 111 and can reduce the overall size of the check valve seat 111, making the structure of the entire return spring integrated valve 1 more compact.

[0052] Specifically, as Figure 2 shown, the check valve seat 111 is integrally formed by machining to ensure the assembly accuracy between the check valve seat 111 and the return spring intermediate cylinder 23. The check valve seat 111 can also be integrally formed by sintering, with low processing cost. The side through-holes 1121 are located at the end of the check valve cover 112 connected to the input end 121 of the return spring solenoid valve 12. The axis of the side through-holes 1121 can be arranged parallel to the axis of the check valve 11, with a simple structure and easy processing; the axis of the side through-holes 1121 can also be inclined from the input end 121 to the output end 122 towards the axis of the check valve 11, which is beneficial to reducing the circumferential size of the check valve 11. CombinedFigure 6 As shown in the figure, the elastic check valve core 113 includes a corrugated spring 1131 and a valve disc 1132. The corrugated spring 1131 is arranged in the check valve cavity 114 so as to be elastically telescopic along the axial direction of the check valve cover 112. The valve disc 1132 can block a plurality of side through holes 1121 on the check valve cover 112 under the elastic force of the corrugated spring 1131. In addition, an inner sealing convex ring 1123 and an outer sealing convex ring 1124 for abutting and sealing with the valve disc 1132 are provided on the inner wall surface of the check valve cover 112. The inner sealing convex ring 1123 is arranged around the inner periphery of the plurality of side through holes 1121, and the outer sealing convex ring 1124 is arranged around the outer periphery of the plurality of side through holes 1121. The structure of the elastic check valve core 113 is simple, easy to install, and is beneficial to reducing the axial dimension of the check valve 11, making the structure of the rebound integrated valve 1 more compact. The oil in the check valve cavity 114 can flow through the gap between the elastic check valve core 113 and the check valve cavity 114. Of course, flow holes communicating with the cover through hole 1122 and the seat through hole 1111 can also be provided on the elastic check valve core 113, so that the oil in the check valve cavity 114 can flow better.

[0053] As Figure 3 shown, in the embodiment of the present utility model, during the compression process of the piston rod mechanism 3, a compression oil path is formed between the rebound integrated valve 1 and the shock absorber body through the check valve 11. The oil in the oil storage cylinder 21 flows into the rebound valve seat 13, then flows into the side through holes 1121 and can flow into the check valve cavity 114 by overcoming the elastic force of the elastic check valve core 113, and then flows into the rebound intermediate cylinder 23 through the seat through hole 1111, thereby forming a compression oil path.

[0054] Specifically, in combination with Figure 1 and Figure 3 shown, during the compression process of the piston rod mechanism 3, the piston rod mechanism 3 slides towards the lower working cavity 222 of the working cylinder 22, so that the volume of the lower working cavity 222 decreases, the volume of the upper working cavity 221 increases, and the oil in the lower working cavity 222 flows into the oil storage cylinder 21 after adjusting the compression damping force through the oil path between the compression solenoid valve 41 and the cylinder body mechanism 2. The oil in the oil storage cylinder 21 flows into the rebound valve seat 13 under the action of the pressure difference and flows into the check valve cavity 114 from the plurality of side through holes 1121 by overcoming the elastic force of the elastic check valve core 113, and then sequentially flows into the rebound intermediate cylinder 23 through the flow hole and the seat through hole 1111, and then flows into the upper working cavity 221.

[0055] As Figure 4As shown, during the rebound process of the piston rod mechanism 3, a rebound oil circuit is formed between the rebound integrated valve 1 and the shock absorber body through the check valve 11. The oil in the rebound intermediate cylinder 23 flows through the seat through-hole 1111 and the cover through-hole 1122 in sequence, then flows into the input end 121 of the rebound solenoid valve 12 and flows out from the output end 122 of the rebound solenoid valve 12, and then flows into the oil storage cylinder 21 from the rebound valve seat 13, thus forming a rebound oil circuit.

[0056] Specifically, as shown in Figure 1 and Figure 4 during the rebound process of the piston rod mechanism 3, the piston rod mechanism 3 slides towards the upper working chamber 221 of the working cylinder 22, causing the volume of the lower working chamber 222 to increase and the volume of the upper working chamber 221 to decrease. The oil in the upper working chamber 221 flows into the rebound intermediate cylinder 23, and then flows through the check valve 11 into the rebound solenoid valve 12. After the rebound damping force is adjusted by the rebound solenoid valve 12, it flows into the oil storage cylinder 21, thereby using the rebound solenoid valve 12 to adjust the magnitude of the rebound damping force. The oil in the oil storage cylinder 21 flows into the lower working chamber 222 through the oil circuit between the lower working chamber 222 and the oil storage cylinder 21.

[0057] Among them, as shown in Figure 1 , Figure 3 and Figure 4 during the compression process and the rebound process of the piston rod mechanism 3, the oil circuit between the lower working chamber 222 and the oil storage cylinder 21 is the same as that in the prior art. The oil circuit between the lower working chamber 222 and the oil storage cylinder 21 includes the oil circuit between the compression solenoid valve 41 and the cylinder body mechanism 2. The compression valve seat 42 is installed on the oil storage cylinder 21. The input end 121 of the compression solenoid valve 41 is connected to the compression intermediate cylinder 24, and the output end 122 of the compression solenoid valve 41 is connected to the oil storage cylinder 21 through the compression valve seat 42.

[0058] As Figure 2 shown, in the embodiment of the present utility model, the rebound valve seat 13 has a first open end 133. The first open end 133 is installed on the oil storage cylinder 21 and is connected to the oil storage cylinder 21. An inner limiting portion 131 is provided inside the first open end 133. The check valve seat 111 is provided with a plurality of limiting bosses 1112. The plurality of limiting bosses 1112 are arranged at intervals and abut against one side surface of the inner limiting portion 131 close to the check valve cover 112. The gap spaces between the plurality of limiting bosses 1112 form a plurality of flow-through channels 1118 connecting the rebound valve seat 13 and the oil storage cylinder 21. By providing the abutting and cooperating of the limiting bosses 1112 and the inner limiting portion 131, the check valve seat 111 can be limited axially, ensuring its axial position accuracy.

[0059] Specifically, the resilient valve seat 13 is generally in a cylindrical structure and has opposite first open end 133 and second open end 134 in its axial direction. An outer limiting portion 132 can be provided on the outer wall surface of the resilient valve seat 13. The outer limiting portion 132 axially abuts against the outer resilient interface 211 on the oil storage cylinder 21 to achieve axial limitation of the resilient valve seat 13. The first open end 133 of the resilient valve seat 13 extends into the outer resilient interface 211, and the outer diameter of the first open end 133 of the resilient valve seat 13 matches the inner diameter of the outer resilient interface 211, so as to achieve circumferential limitation of the resilient valve seat 13. The first open end 133 of the resilient valve seat 13 is installed on the oil storage cylinder 21 by welding and is in communication with the oil storage cylinder 21.

[0060] As Figure 2 shown, when installing the resilient integrated valve 1, first assemble the components of the check valve 11, including the check valve seat 111, the check valve cover 112, the corrugated spring 1131 and the valve disc 1132 of the elastic check valve core 113, the first sealing ring 1151, and the third sealing ring 1171; then install the pre-assembled check valve 11 into the resilient valve seat 13 from the second open end 134 of the resilient valve seat 13 and communicate it with the resilient intermediate cylinder 23, that is, first pre-assemble the check valve 11, then install the check valve 11 into the resilient valve seat 13, and seal and insert the second joint 1117 of the check valve seat 111 of the check valve 11 into the inner resilient interface 231; finally, install the resilient solenoid valve 12 at the second open end 134 of the resilient valve seat 13 and make the resilient solenoid valve 12 communicate with the check valve cover 112.

[0061] Combined with Figure 5 and Figure 6 shown, the check valve seat 111 is provided with a limiting plate 1113. The limiting plate 1113 has opposite first limiting surface 1114 and second limiting surface 1115 in the axial direction of the check valve 11. A plurality of limiting bosses 1112 are provided on the first limiting surface 1114. The check valve cover 112 axially abuts against the second limiting surface 1115 along the axial direction of the check valve 11. By axially abutting the check valve seat 111 against the inner limiting portion 131 of the resilient valve seat 13, and then axially abutting the check valve cover 112 against the limiting plate 1113 of the check valve seat 111, the installation and positioning of the check valve 11 in the resilient valve seat 13 can be achieved, and the structure is simple and easy to install, which is conducive to ensuring the assembly accuracy between the check valve 11, the resilient solenoid valve 12, and the resilient intermediate cylinder 23.

[0062] Specifically, a plurality of limiting bosses 1112 are arranged at intervals along the circumferential direction of the check valve 11 on the first limiting surface 1114. Both the limiting plate 1113 and the inner limiting portion 131 are generally in the form of an annular plate structure. The outer diameter of the limiting plate 1113 is equal to or slightly larger than the circumferential distribution outer diameter of the plurality of limiting bosses 1112. The circumferential distribution outer diameter of the plurality of limiting bosses 1112 is larger than the inner diameter of the inner limiting portion 131. The outer diameter of the limiting plate 1113 is smaller than the inner diameter of the return spring valve seat 13, and the outer diameter of the check valve cover 112 is also smaller than the inner diameter of the return spring valve seat 13, so that there is a clearance space between the check valve 11 and the return spring valve seat 13 in the circumferential direction of the check valve 11. Therefore, the output end 122 of the return spring solenoid valve 12 and the input end 121 of the side through hole 1121 on the check valve 11 are connected to the oil storage cylinder 21 through the clearance space and the flow passage 1118.

[0063] Combined with Figure 5 and Figure 6 As shown, a first joint 1116 is provided on the second limiting surface 1115. The check valve cover 112 is sleeved on the first joint 1116 along the axial direction of the check valve 11 and cooperates to form a check valve cavity 114, and the first joint 1116 and the check valve cover 112 are hermetically connected through a first sealing structure 115. The first sealing structure 115 includes a first sealing ring 1151 and a first sealing groove 1152. The first sealing groove 1152 is opened on the outer wall surface of the first joint 1116, and the first sealing ring 1151 is installed in the first sealing groove 1152 and abuts against the second limiting surface 1115. Specifically, the check valve cover 112 can be sleeved on the first joint 1116 by means of threaded connection. The first sealing groove 1152 is generally in the form of a groove structure provided at the connection between the first joint 1116 and the second limiting surface 1115, so that the first sealing ring 1151 can not only abut against the outer wall surface of the first joint 1116, but also abut against the second limiting surface 1115 of the limiting plate 1113, thereby ensuring the sealing performance between the first joint 1116 and the check valve cover 112.

[0064] Combined with Figure 5 and Figure 6 As shown, the check valve cover 112 abuts against the end face of the input end 121 of the return spring solenoid valve 12 along its axial direction, and the check valve cover 112 and the return spring solenoid valve 12 are hermetically connected through a second sealing structure 116. The second sealing structure 116 includes a second sealing groove 1162 and a second sealing ring 1161. The second sealing groove 1162 is opened along the circumferential direction of the check valve cover 112 on the check valve cover 112 and is located around the cover through hole 1122, and the second sealing ring 1161 is installed in the second sealing groove 1162. The assembly between the check valve cover 112 and the input end 121 of the return spring solenoid valve 12 can be realized by means of axial abutment, and the structure is simple and easy to install.

[0065] Combined with Figure 2 andFigure 5 and Figure 6 As shown, in the embodiment of the present utility model, the inner return cylinder 23 is provided with an inner return interface 231, and the inner return interface 231 is communicated with the inner cavity of the inner return cylinder 23. The check valve seat 111 is provided with a second joint 1117, and the second joint 1117 is inserted into the inner return interface 231 and is hermetically connected through a third sealing structure 117. Since the check valve seat 111 is in abutting cooperation with the inner limiting portion 131 on the return valve seat 13 through the limiting boss 1112 to ensure the axial position accuracy of the check valve seat 111, the second joint 1117 of the check valve seat 111 can be matched with the inner return interface 231 of the inner return cylinder 23 only by insertion, and the situation that the second joint 1117 is inserted too deep and occupies the annulus between the inner return cylinder 23 and the working cylinder 22 can be avoided. Therefore, it will not affect the cross-sectional area of the oil flow between the check valve 11 and the inner return cylinder 23, and there is no need to provide an axial limiting structure on the second joint 1117 to cooperate with the inner return interface 231. Therefore, the overall diameter of the second joint 1117 is slightly smaller than the inner diameter of the inner return interface 231, avoiding the situation that an axial limiting structure is provided on the second joint 1117 and occupying the annulus between the oil storage cylinder 21 and the inner return cylinder 23, thereby affecting the cross-sectional area of the oil flow between the return valve seat 13 and the oil storage cylinder 21.

[0066] Specifically, as Figure 6 shown, the third sealing structure 117 includes a third sealing ring 1171 and a third sealing groove 1172, and the third sealing ring 1171 is installed in the third sealing groove 1172. The third sealing groove 1172 can be opened on the inner wall surface of the inner return interface 231. Since the outer diameter of the second joint 1117 is restricted by the inner diameter of the inner return interface 231, when the wall thickness of the second joint 1117 is larger, its inner diameter is smaller, and the cross-sectional area of the oil flow between the check valve 11 and the inner return cylinder 23 is also smaller. Compared with opening the third sealing groove 1172 on the outer wall surface of the second joint 1117, the present utility model opens the third sealing groove 1172 on the inner wall surface of the inner return interface 231, which can avoid the situation that the slotting affects the structural strength of the second joint 1117 and requires increasing the wall thickness to ensure its structural strength, thereby resulting in a reduction in the cross-sectional area of the oil flow between the check valve 11 and the inner return cylinder 23. Of course, the third sealing groove 1172 can also be opened on the outer wall surface of the second joint 1117, and the installation is more convenient. And the cross-sectional area of the oil flow between the check valve 11 and the inner return cylinder 23 can be ensured to meet the requirements by controlling the depth of the second joint 1117 extending into the inner return interface 231 and / or by enlarging the inner diameter of the inner return interface 231.

[0067] Embodiment Two

[0068] As Figure 5 and Figure 6As shown in the figure, the present utility model further provides a check valve 11, which can be applied to a double-valve shock absorber in an external manner.

[0069] The check valve 11 of the present utility model includes: a check valve seat 111 provided with a cover through-hole 1122; a check valve cover 112 covering the check valve seat 111 and cooperating to form a check valve cavity 114. The check valve seat 111 is provided with a seat through-hole 1111, and both the cover through-hole 1122 and the seat through-hole 1111 are communicated with the check valve cavity 114; an elastic check valve core 113 is installed in the check valve cavity 114. A plurality of side through-holes 1121 are arranged at intervals along the circumferential direction of the check valve cover 112, and the elastic check valve core 113 can block the side through-holes 1121 by its own elastic force. In this embodiment, the specific structure, working principle, and beneficial effects of the check valve 11 are the same as those of the check valve 11 in Embodiment 1, and will not be repeated here.

[0070] The above are only several embodiments of the present utility model. Those skilled in the art can make various changes or modifications to the embodiments of the present utility model without departing from the spirit and scope of the present utility model based on the content disclosed in the application documents.

Claims

1. A double-valve shock absorber with an external check valve, characterized in that: include: Shock absorber body; A compression solenoid valve is mounted on the oil storage cylinder of the shock absorber body and is connected to the oil storage cylinder and the compression intermediate cylinder of the shock absorber body; A rebound integrated valve, comprising a rebound solenoid valve, a check valve and a rebound valve seat, wherein the rebound valve seat is mounted on the oil storage cylinder, the rebound solenoid valve and the check valve are both mounted in the rebound valve seat, the output end of the rebound solenoid valve is connected to the oil storage cylinder through the rebound valve seat, and the input end of the rebound solenoid valve is connected to the rebound intermediate cylinder of the shock absorber body through the check valve; Wherein, the check valve comprises a check valve seat, a check valve cover and an elastic check valve core; The check valve cover is provided with a cover through hole, the check valve cover is sealed and connected with the input end of the rebound solenoid valve and communicates with the input end of the rebound solenoid valve through the cover through hole, the check valve cover is covered on the check valve seat and cooperates to form a check valve cavity, the check valve seat is provided with a seat through hole, the cover through hole and the seat through hole are both communicated with the check valve cavity; The check valve seat extends from the rebound valve seat and is sealed and connected to the rebound intermediate cylinder, and the check valve seat is in communication with the rebound intermediate cylinder through the seat through hole; The elastic check valve core is installed in the check valve cavity, and a plurality of bypass holes are arranged at intervals along the circumference of the check valve cover. The elastic check valve core can block the bypass holes by its own elastic force.

2. The double-valve shock absorber with external check valve according to claim 1, characterized in that: During the compression process of the piston rod mechanism of the shock absorber body, a compression oil path is formed between the rebound integrated valve and the shock absorber body through the check valve, and the oil in the oil storage cylinder flows into the rebound valve seat and overcomes the elastic force of the elastic check valve core and flows into the check valve cavity from the bypass hole, and then flows into the rebound intermediate cylinder through the seat through hole, thereby forming the compression oil path; During the rebound process of the piston rod mechanism, a rebound oil circuit is formed between the rebound integrated valve and the shock absorber body through the check valve, and the oil in the rebound intermediate cylinder flows into from the input end of the rebound solenoid valve and flows out from the output end of the rebound solenoid valve through the seat through hole, the check valve chamber and the cover through hole in sequence, and then flows into the oil storage cylinder from the rebound valve seat, thereby forming the rebound oil circuit.

3. The double-valve shock absorber with external check valve according to claim 1, characterized in that: The rebound valve seat has a first opening end, which is mounted on the oil storage cylinder and communicated with the oil storage cylinder. An inner limit portion is provided on the inner side of the first opening end. The check valve seat is provided with a plurality of limit bosses, which are arranged at intervals and abut against a side surface of the inner limit portion close to the check valve cover. The gap spaces between the plurality of limit bosses form a plurality of flow channels connecting the rebound valve seat and the oil storage cylinder.

4. The double-valve shock absorber with external check valve as claimed in claim 3, characterized in that: The check valve seat is provided with a limit plate, and the limit plate has a first limit surface and a second limit surface opposite to each other in the axial direction of the check valve. A plurality of limit bosses are provided on the first limit surface, and the check valve cover abuts against the second limit surface along the axial direction of the check valve.

5. The double-valve shock absorber with external check valve as claimed in claim 4, characterized in that: A first joint is provided on the second limiting surface, the check valve cover is sleeved on the first joint along the axial direction of the check valve and cooperates to form the check valve cavity, and the first joint and the check valve cover are sealed and connected via a first sealing structure.

6. The double-valve shock absorber with external check valve as claimed in claim 5, characterized in that: The first sealing structure includes a first sealing ring and a first sealing groove. The first sealing groove is formed on the outer wall surface of the first joint. The first sealing ring is installed in the first sealing groove and abuts against the second limiting surface.

7. The double-valve shock absorber with external check valve according to claim 1, characterized in that: The check valve cover abuts against the end face of the input end of the rebound solenoid valve along its axial direction, and the check valve cover and the rebound solenoid valve are sealed and connected via a second sealing structure, the second sealing structure comprises a second sealing groove and a second sealing ring, the second sealing groove is opened on the check valve cover along the circumference of the check valve cover and is located at the periphery of the cover through hole, the second sealing ring is installed in the second sealing groove.

8. The double-valve shock absorber with external check valve as claimed in claim 1, characterized in that: The rebound intermediate cylinder is provided with an inner rebound interface, which is communicated with the inner cavity of the rebound intermediate cylinder; the check valve seat is provided with a second joint, which is inserted into the inner rebound interface and is sealed and connected through a third sealing structure.

9. The double-valve shock absorber with external check valve as claimed in claim 8, characterized in that: The third sealing structure includes a third sealing ring and a third sealing groove. The third sealing ring is installed in the third sealing groove. The third sealing groove is opened on the inner wall surface of the inner rebound interface or on the outer wall surface of the second joint.

10. The double-valve shock absorber with external check valve according to claim 1, characterized in that: The bypass hole is located at one end of the check valve cover connected to the input end of the rebound solenoid valve, the axis of the bypass hole is arranged parallel to the axis of the check valve, or the axis of the bypass hole is arranged inclined toward the axis of the check valve from the input end to the output end.

11. The double-valve shock absorber with external check valve according to claim 1, characterized in that: The elastic check valve core is a wave spring, and the elastic check valve core can be elastically and telescopically arranged in the check valve cavity along the axial direction of the check valve cover.

12. A check valve, characterized in that: In the double-valve shock absorber with external check valve applied to any one of claims 1 to 11, the check valve comprises: The check valve seat is provided with a cover through hole; A check valve cover, which covers the check valve seat and cooperates to form a check valve cavity, the check valve seat is provided with a seat through hole, and the cover through hole and the seat through hole are both connected to the check valve cavity; An elastic check valve core is installed in the check valve cavity. A plurality of bypass holes are arranged at intervals along the circumference of the check valve cover. The elastic check valve core can block the bypass holes by its own elastic force.

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