Shock absorber, suspension system and vehicle

Abstract

The utility model provides a shock absorber, a suspension system and a vehicle. The shock absorber includes a cylinder barrel, a piston located within the cylinder barrel to divide an internal space of the cylinder barrel into a first chamber and a second chamber and configured to move within the cylinder barrel in an axial direction of the cylinder barrel, and a piston rod at least partially located within the cylinder barrel and connected to the piston, a first through hole penetrating through the rod body in the axial direction of the rod body is formed in the rod body, the piston rod further comprises an inner pipe arranged in the first through hole, a gap is formed between the inner pipe and the inner wall of the first through hole, and a first fluid channel is defined in the inner pipe. A second fluid channel is defined by the interval between the inner pipe and the inner wall of the first through hole, the first fluid channel is communicated with the first cavity, and the second fluid channel is communicated with the second cavity. The shock absorber can simplify the assembly process of the shock absorber and is easy to maintain.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile shock absorber, more particularly to a shock absorber, suspension system and vehicle. BACKGROUND

[0002] In modern automobiles, shock absorbers are an important component of the suspension system, which mainly functions to control the relative movement between the vehicle body and wheels, absorb road impact and vibrations, and thus improve the vehicle's ride stability and driving comfort. Currently, traditional shock absorbers usually adopt an oil-gas separation structure, which realizes the adjustment of damping characteristics through a complex internal oil circuit and damping valve system. However, this design has limitations when facing different road conditions and driving needs, such as slow response speed, limited damping adjustment range, and inability to dynamically optimize performance according to real-time working conditions.

[0003] With the rapid development of the automotive industry, especially the popularization of intelligent and electric technologies, the performance requirements of vehicles on suspension systems are gradually increasing. Some high-end vehicles have begun to introduce active suspension systems, which cooperate with external hydraulic pumps and shock absorbers to achieve precise control of damping force and dynamic adjustment of suspension stiffness. This technology not only significantly improves the adaptability of vehicles in different road conditions, but also significantly improves the handling and safety of vehicles through cooperation with sensors and control units. The oil circuit structure is one of the key factors affecting the damping performance. Usually, a more complex oil circuit design is used to achieve the adaptability of the shock absorber to different road conditions. However, the existing shock absorber and pump cooperation design still has problems such as complex structure, high cost, and insufficient reliability. The complex oil circuit structure often increases manufacturing difficulty, cost, and maintenance complexity, and may affect the reliability and durability of the shock absorber. Therefore, how to simplify the oil circuit design while ensuring the damping performance has become an important research direction in this field. SUMMARY

[0004] One of the purposes of the utility model is to provide a shock absorber including a novel oil circuit design, which integrates the oil circuits connecting different chambers in the piston rod, making assembly simple and easy to maintain.

[0005] According to one aspect of the present application, a shock absorber is provided, comprising: a cylinder, a piston, located inside the cylinder to separate the internal space of the cylinder into a first chamber and a second chamber, and configured to move in the axial direction of the cylinder inside the cylinder, a piston rod, at least partially located inside the cylinder and connected to the piston, wherein the piston rod comprises a rod body, the rod body comprises a first through hole penetrating in the axial direction thereof, the piston rod further comprises an inner tube arranged in the first through hole, the inner tube has a spacing with the inner wall of the first through hole, the inside of the inner tube defines a first fluid channel, the spacing between the inner tube and the inner wall of the first through hole defines a second fluid channel, the first fluid channel communicates with the first chamber, and the second fluid channel communicates with the second chamber.

[0006] In the shock absorber according to some embodiments of the present application, the piston rod comprises a first end and a second end opposite to each other, the second end of the piston rod is connected to the piston, and the first end of the piston rod is located on the side of the piston away from the first chamber, and both the first fluid channel and the second fluid channel extend to the first end of the piston rod.

[0007] In the shock absorber according to some embodiments of the present application, the rod body comprises a second through hole extending in the radial direction thereof, the second through hole is located on the side of the piston away from the first chamber, and the second fluid channel is connected to the second chamber through the second through hole.

[0008] In the shock absorber according to some embodiments of the present application, further comprising: a connecting base, the connecting base comprises a third fluid channel and a fourth fluid channel, the connecting base is connected to the first end of the piston rod, the third fluid channel communicates with the first fluid channel, and the fourth fluid channel communicates with the second fluid channel.

[0009] In the shock absorber according to some embodiments of the present application, the connecting base comprises a mounting side, the mounting side comprises an annular wall, the annular wall surrounds to define a first recess, an annular protrusion is arranged on the bottom surface of the first recess, the annular protrusion surrounds to define a second recess, the third fluid channel extends to the second recess, the fourth fluid channel extends to the first recess, the part of the rod body located at the first end of the piston rod is embedded in the first recess, and the part of the inner tube located at the first end of the piston rod and the annular protrusion are nested with each other, so that the third fluid channel communicates with the first fluid channel, and the fourth fluid channel communicates with the second fluid channel.

[0010] In the shock absorber according to some embodiments of the present application, a portion of the inner tube located at the first end of the piston rod is embedded in the second recess, and an outer side surface of the portion of the inner tube embedded in the second recess is fitted to an inner side surface of the annular protrusion.

[0011] In the shock absorber according to some embodiments of the present application, an outer side surface of the portion of the rod body embedded in the first recess is fitted to an inner side surface of the annular wall, the portion of the rod body embedded in the first recess includes a third through hole extending from an inner wall of the first through hole of the rod body to an outer side surface of the rod body, and the fourth fluid passage communicates with the second fluid passage through the third through hole.

[0012] In the shock absorber according to some embodiments of the present application, first and second annular seals are provided between the outer side surface of the portion of the rod body embedded in the first recess and the inner side surface of the annular wall, and the first and second annular seals are respectively located on both sides of the third through hole in the axial direction of the piston rod.

[0013] In the shock absorber according to some embodiments of the present application, the rod body further includes a fourth through hole connecting the third through hole and an end surface of the rod body located at the first end of the piston, and the shock absorber further includes a sealing plug extending from inside the connecting base into the fourth through hole, and a third annular seal is provided between a portion of the sealing plug inserted into the fourth through hole and an inner wall of the fourth through hole.

[0014] In the shock absorber according to some embodiments of the present application, a gasket is provided between an end surface of the inner tube located at the first end of the piston rod and a bottom surface of the second recess, and the third fluid passage includes an opening in the bottom surface of the second recess to communicate with the first fluid passage.

[0015] In the shock absorber according to some embodiments of the present application, the third fluid passage and the fourth fluid passage respectively extend to opposite sides of the mounting side of the connecting base, and the third fluid passage and the fourth fluid passage respectively include an external oil passage interface at the end of the opposite side.

[0016] In the shock absorber according to some embodiments of the present application, the third fluid passage comprises a first segment, a second segment and a third segment connected in sequence, the first segment and the third segment extend substantially parallel to the axial direction of the piston rod, the second segment extends substantially perpendicular to the axial direction of the piston rod, the first segment extends to the opposite side of the mounting side of the connecting base, the third segment extends to the bottom surface of the second recess, the fourth fluid passage comprises a fourth segment and a fifth segment connected in sequence, the fourth segment extends substantially parallel to the axial direction of the piston rod, the fifth segment extends substantially perpendicular to the axial direction of the piston rod, the fourth segment extends to the opposite side of the mounting side of the connecting base, and the fifth segment extends to the side wall of the first recess.

[0017] In the shock absorber according to some embodiments of the present application, the second segment and the fifth segment both extend to the outer side surface of the connecting base, and the openings of the second segment and the fifth segment on the outer side surface of the connecting base are sealed by sealing plugs.

[0018] In the shock absorber according to some embodiments of the present application, an oil seal structure is further included, which is arranged in the cylinder and located on the side of the piston away from the second cavity, the piston rod penetrates through the oil seal structure, and the second through hole is located between the piston and the oil seal structure in the axial direction of the piston rod.

[0019] In the shock absorber according to some embodiments of the present application, a first support located on the outer side surface of the connecting base, a second support located on the outer side surface of the cylinder, and an elastic member sleeved outside the cylinder are further included, and the two ends of the elastic member abut against the first support and the second support respectively.

[0020] According to another aspect of the present application, a suspension system is provided, which comprises the shock absorber according to any of the above embodiments and a pump, the input end and the output end of the pump being in communication with the first fluid passage and the second fluid passage of the shock absorber respectively.

[0021] According to still another aspect of the present application, a vehicle is provided, which comprises the shock absorber according to any of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a schematic view of the cross-sectional structure of a shock absorber according to an embodiment of the present application.

[0023] Figure 2 FIG. 2 shows a partial cross-sectional structure of the shock absorber at the first end of the piston rod comprising a connecting base.

[0024] Figure 3A schematic cross-sectional view of the first end of the piston rod removed from the connecting base is shown.

[0025] Figure 4 A schematic diagram of a partial cross-sectional structure of the first end of the piston rod is shown.

[0026] Figure 5 This is a three-dimensional structural diagram of the connecting base of the shock absorber according to an embodiment of the present utility model.

[0027] Figure 6 This is a side view of a shock absorber according to an embodiment of the present invention.

[0028] Figure 7 For along Figure 6 The diagram shows a cross-section taken by line AA.

[0029] Figure 8 For along Figure 6 The diagram shows a cross-section taken by line BB.

[0030] Figure 9 This is a partial cross-sectional structural diagram of the second end of the piston rod in the shock absorber according to an embodiment of the present utility model.

[0031] Explanation of reference numerals in the attached drawings: 100-Cylinder; 101-First chamber; 102-Second chamber; 200-Piston; 300-Piston rod; 301-Rod body; 302-Inner tube; 311-First fluid passage; 312-Second fluid passage; 3011-First through hole; 3012-Second through hole; 3013-Third through hole; 3014-Fourth through hole; 303-Sealing plug; 3041-First annular seal; 3042-Second annular seal; 305-Third annular seal; 306-Washer; 307-Washer; 3201-First fixing member; 308-Second fixing member; 400-Connecting base; 430-Third fluid passage; 431-First section; 432-Second section; 433-Third section; 440-Fourth fluid passage; 4301-External oil circuit interface; 444-Fourth section; 445-Fifth section; 4302-External oil circuit interface; 500-Oil seal structure; 501-First support member; 502-Second support member; 600-Elastic member. Detailed Implementation

[0032] To more fully set forth the technical ideas and specific implementation manners of the present application, the structure, operation process and possible technical effects of the present application will be described below by exemplary embodiments in conjunction with the drawings. The embodiments of the present application involve improvements and innovations in several technical fields, and the applicability of the schemes provided on this basis is extensive in different scenarios, which can be implemented independently or in combination with other technical schemes. The present application is not limited to the specific embodiments described, and in actual applications, the skilled person can make various appropriate adjustments without deviating from the spirit of the present application.

[0033] According to an embodiment of the present application, a shock absorber is provided, comprising a cylinder, a piston and a piston rod. The piston is located in the cylinder to separate the internal space of the cylinder into a first chamber and a second chamber, and is configured to move in the axial direction of the cylinder within the cylinder. The piston rod is connected to the piston and comprises a rod body, the rod body comprising a first through hole extending therethrough in the axial direction thereof, the piston rod further comprising an inner tube arranged in the first through hole, the inner tube having a gap with the inner wall of the first through hole. The interior of the inner tube defines a first fluid passage, and the gap between the inner tube and the inner wall of the first through hole defines a second fluid passage, the first fluid passage being in communication with the first chamber, and the second fluid passage being in communication with the second chamber. In this shock absorber, the fluid passages through different chambers are designed in the piston rod, not only allowing the fluid passages of each chamber to be directly connected to the outside, but also allowing the design of other components of the shock absorber to be simple and easy to assemble.

[0034] In addition, on the basis of arranging the fluid passages connecting different chambers in the piston rod as described above, the connection of the shock absorber to the outside can be conveniently connected by the connection base connected to the piston rod. Below, the related technical schemes according to some embodiments of the present application will be described in more detail, so that the technical schemes and related technical advantages according to the embodiments of the present application are more clear.

[0035] Figure 1 A cross-sectional structure diagram of a shock absorber according to an embodiment of the present application is shown. As shown in Figure 1 the shock absorber comprises a cylinder 100 and a piston 200 located in the cylinder 100. The piston 200 is located in the cylinder 100 to separate the internal space of the cylinder 100 into a first chamber 101 and a second chamber 102, and is configured to move in the axial direction of the cylinder 100 within the cylinder 100. A piston rod 300 is connected to the piston 200. For example, the piston rod 300 can move together with the piston 200 along the axial direction of the cylinder 100.

[0036] For example, the cylinder 100 can be a cylindrical structure, which can be made of carbon steel, alloy steel or aluminum alloy to have high strength, corrosion resistance, wear resistance and good sealing performance. The inner surface of the cylinder 100 can be precisely machined and surface treated (such as chromium plating, nitriding, etc.) to improve durability, smooth inner wall and accurate size to ensure smooth movement of the piston and no leakage, while meeting the design requirements of lightweight and economy. However, the shock absorber according to the embodiments of the present application does not have special restrictions on the shape, size and material of the cylinder, and various cylinder structures in the art can be used.

[0037] For example, the piston 200 can be disc-shaped and can be made of high-strength materials such as aluminum alloy or stainless steel, with a smooth and wear-resistant surface. The piston 200 can have precisely designed flow channels or valve ports to regulate fluid flow. The piston 200 can be equipped with a sealing ring around it, which tightly fits the inner wall of the cylinder 100 to ensure sealing and low-friction movement. For example, the piston 200 can have high strength, corrosion resistance and temperature resistance, thereby effectively achieving shock absorption and buffering functions. For example, in the example shown, the piston 200 is made of aluminum alloy, which has high strength and corrosion resistance, and the surface of the piston 200 is treated with chromium plating to improve wear resistance and sealing performance. Figure 1 In the example shown, the first chamber 101 is the chamber below the piston 200, and the second chamber 102 is the chamber above the piston 200. When the piston 200 moves downward (compression stroke), the fluid in the first chamber 101 can flow into the second chamber 102 through the flow channels and valves in the piston; when the piston 200 moves upward (recovery stroke), the fluid in the second chamber 102 can flow into the first chamber 101 through the flow channels and valves in the piston, thereby partially absorbing shock. However, the shock absorber according to the embodiments of the present application does not have special restrictions on the shape, size and material of the piston, and various piston structures in the art can be used. As described in other parts of the specification, the shock absorber according to the embodiments of the present application can also include fluid channels that communicate between the outside and the first chamber 101 and the second chamber 102 to further adjust the performance of the shock absorber based on external devices. It should be noted that the volumes of the first chamber 101 and the second chamber 102 are not fixed, when the shock absorber is in compression stroke, the volume of the first chamber 101 decreases and the volume of the second chamber 102 increases; when the shock absorber is in recovery stroke, the volume of the first chamber 101 increases and the volume of the second chamber 102 decreases.

[0038] In the shock absorber according to the embodiments of the present application, the first fluid passage 311 and the second fluid passage 312 are arranged inside the piston rod 300. The first fluid passage 311 is in communication with the first chamber 101, and the second fluid passage 312 is in communication with the second chamber 102. For example, the first fluid passage 311 and the second fluid passage 312 in the piston rod 300 are connected to the upper and lower chambers in the cylinder 100, respectively. With the first fluid passage 311 and the second fluid passage 312, the first chamber and the second chamber in the shock absorber can be in communication with external devices (e.g., pumps, accumulators, etc.) respectively, so as to adjust the shock absorbing performance of the shock absorber. Moreover, the flow passages connected to different chambers are integrated in the piston rod, which can avoid additional design of fluid passages in the cylinder or other parts, so as to simplify the structure and facilitate assembly.

[0039] For example, as shown in FIG. 1, the first fluid passage 311 and the second fluid passage 312 extend along the axial direction of the piston rod 300 to extend from the upper end of the piston rod 300 to the lower end or the vicinity of the lower end of the piston rod 300, and are in communication with the first chamber 101 and the second chamber 102 on the lower side and the upper side of the piston rod, respectively. Figure 1

[0040] As shown in FIG. 1, in some examples, the piston rod 300 includes a rod body 301, and the rod body 301 includes a first through hole 3011 extending therethrough along the axial direction thereof. Figure 1 Figure 1 As shown in FIG. 1, the through hole extending along the axial direction of the rod body 301 is the first through hole 3011. The piston rod 300 further includes an inner tube 302 arranged in the first through hole 3011, and the inner tube 302 has a spacing from the side wall of the first through hole 3011 (i.e., the inner side surface of the rod body 301). The inside of the inner tube 302 defines the first fluid passage 311, and the spacing between the inner tube 302 and the side wall of the first through hole 3011 defines the second fluid passage 312. In this embodiment, by arranging the through hole in the rod body of the piston rod 300 and arranging the inner tube in the through hole, the first flow passage and the second flow passage described above can be formed in a simple form, thereby reducing the manufacturing cost.

[0041] For example, the rod body 301 in the piston 300 bears most of the force when the piston moves, and therefore, the wall thickness of the rod body can be greater than the wall thickness of the inner tube, so as to provide greater mechanical strength for the piston.

[0042] ​​For example, the flow passage cross-sectional area of the first flow passage 311 can be determined by the inner diameter of the inner tube, and the flow passage cross-sectional area of the second flow passage 312 can be determined by the spacing dimension between the inner tube and the side wall of the first through hole. For the second fluid passage 312, it can be an annular flow passage which surrounds the inner tube 301. For example, the cross-sectional area of the first flow passage 311 and the cross-sectional area of the second flow passage 312 can be substantially equal to each other, however, embodiments according to the present application are not limited thereto.

[0043] As shown in Figure 1 , according to some embodiments of the present application, the piston rod 300 includes a first end 310 and a second end 320 opposite to each other, the second end 320 of the piston rod 300 is connected to the piston 200, and the first end 310 of the piston rod 300 is located on the side of the piston 200 away from the first chamber 101. As shown in Figure 1 , most of the piston rod 300 is located in the second chamber 102, therefore, the second chamber 102 can also be referred to as a rod chamber, and the first chamber 101 can also be referred to as a rodless chamber. For example, the first end 310 of the piston rod 300 is the upper end of the piston rod shown in Figure 1 , and the second end 320 of the piston rod 300 is the lower end of the piston rod shown in Figure 1 . Both the first fluid passage 311 and the second fluid passage 312 extend to the first end of the piston rod 300. For example, in the case that both the first fluid passage 311 and the second fluid passage 312 extend to the first end of the piston rod 300, it can be made that the first flow passage 311 and the second fluid passage 312 can be connected to external devices through the same connecting component. For example, a connecting base connected to the piston rod will be described in detail in the following of the present specification, which can lead the first fluid passage and the second fluid passage out of the shock absorber.

[0044] As shown in Figure 1As shown, in some embodiments according to the present application, the rod body 301 includes a second through hole 3012 extending along the radial direction thereof, the second through hole 3012 is located at the side of the piston 200 away from the first chamber 101, and the second fluid passage 312 is connected to the second chamber 312 through the second through hole 3012. It should be noted that the extension of the second through hole 3012 along the radial direction is not limited to the case that the extension direction of the central axis of the second through hole 3012 is completely consistent with the radial direction of the rod body 301, but the extension direction of the second through hole 3012 only needs to have a component of the above-mentioned radial direction. In this way, the second through hole 3012 can extend from the side wall of the first through hole to the outer side of the rod body 301, thereby connecting the second fluid passage 312 and the second chamber 102. In addition, the number of second through holes 3012 can be one or more, and in the case of multiple second through holes 3012, they can be uniformly distributed in the circumferential direction of the rod body 301.

[0045] In some embodiments according to the present application, as shown in Figure 1 The shock absorber further includes a connecting base 400 connected to the first end of the piston rod 300. The connecting base 400 is provided with fluid passages respectively communicating with the first fluid passage 311 and the second fluid passage 312 in the piston rod 300. Figure 2 A partial cross-sectional structure schematic view of the connecting base 400 located at the first end of the piston rod of the shock absorber is shown. As shown in Figure 2 The connecting base 400 includes a third fluid passage 430 and a fourth fluid passage 440, the third fluid passage 430 communicates with the first fluid passage 311 of the piston rod 300, and the fourth fluid passage 440 communicates with the second fluid passage 312 of the piston rod 300. In this case, the fluid passages in the piston rod 300 communicating with different chambers can be connected to the outside through the fluid passages in the connecting base.

[0046] For the sake of clarity of the drawing, Figure 3 A cross-sectional structure schematic view of the first end of the piston rod 300 removed from the connecting base 400 is shown. As shown in Figure 3 The connecting base 400 includes a mounting side, i.e. the side where the connecting base and the piston rod are mounted to each other, in Figure 3 the lower side of the connecting base. The mounting side of the connecting base 400 includes an annular wall 410, which surrounds to define a first recess 411. In the first recess 411, an annular protrusion 420 is further provided on the bottom surface of the first recess, which surrounds to define a second recess 421. The third fluid passage 430 extends to the second recess 421, and the fourth fluid passage 440 extends to the first recess 411. For example, the third fluid passage 430 extends to the bottom surface of the second recess 421, and the fourth fluid passage 440 extends to the side surface of the second recess 411. In combinationFigure 2 and Figure 3 As shown, the portion of the rod body 301 located at the first end of the piston rod 300 is embedded in the first recess 411, and the portion of the inner tube 302 located at the first end of the piston rod 300 is nested with the annular protrusion 420, so that the third fluid channel 430 communicates with the first fluid channel 311, and the fourth fluid channel 440 communicates with the second fluid channel 312. By providing the first and second recesses, as well as the associated annular walls and annular protrusions on the connecting base, the piston rod and the connecting base can be easily assembled, while the corresponding fluid channels are connected to each other, which is beneficial to the sealing of the fluid channel connection.

[0047] like Figure 2 As shown, the portion of the inner tube 302 located at the first end of the piston rod 300 is embedded in the second recess 421, and the outer surface of the portion of the inner tube 302 embedded in the second recess 421 is in contact with the inner surface of the annular protrusion 420. For example, the outer diameter of the inner tube 302 is approximately equal to the inner diameter of the annular protrusion 420. In this case, while the third fluid channel and the first fluid channel are connected, the stability of the spacing between the inner tube 302 and the sidewall of the first through hole of the rod body 301 can also be ensured. In this case, the annular protrusion 420 is sandwiched between the outer surface of the inner tube 302 and the inner surface of the rod body 301, and its radial thickness is substantially equal to the spacing between the outer surface of the inner tube 302 and the inner surface of the rod body 301. However, it should be noted that the shock absorber according to the embodiment of the present invention is not limited to the case where the inner tube 302 is embedded in the second recess 421, and the annular protrusion may also be embedded inside the inner tube 302.

[0048] like Figure 2 As shown, the outer surface of the portion of the rod body 301 embedded in the first recess 411 fits against the sidewall of the first recess 411 (i.e., the inner surface of the annular wall 410). The portion of the rod body 301 embedded in the first recess 411 includes a third through hole 3013 extending from the sidewall of the first through hole 3011 of the rod body 301 (i.e., the inner surface of the rod body 301) to the outer surface of the rod body 301. The fourth fluid channel 440 communicates with the second fluid channel 312 through the third through hole 3013. For example, the outer diameter of the rod body 301 is approximately equal to the inner diameter of the annular wall 410.

[0049] like Figure 2As shown, the outer side of the portion of the rod body 301 embedded in the first recess 411 and the sidewall of the first recess 411 are provided with a first annular seal 3041 and a second annular seal 3042, which are respectively located on both sides of the third through hole in the axial direction of the piston rod 300. For example, the first annular seal 3041 is located on the upper side of the third through hole 3013, and the second annular seal 3042 is located on the lower side of the third through hole. By respectively arranging the first seal 3041 and the second annular seal 3042 on both sides of the third through hole, the path connected by the fourth fluid passage 440 and the second fluid passage 312 can be sealed.

[0050] Figure 4 A partial cross-sectional structure schematic diagram of the first end of the piston rod 300 is shown. As shown in the figure, Figure 4 The piston rod 300 includes a first fluid passage 311 defined inside the inner tube 302 and a second fluid passage 312 defined by the interval between the inner tube 302 and the rod body 301. The third through hole 3013 is connected with the second fluid passage 312. The rod body 301 also includes a fourth through hole 3014 connecting the third through hole 3013 and the end face of the rod body 301 at the first end of the piston rod 300 (i.e., Figure 4 The upper end face shown in the figure), and a sealing plug 303 extending from the connecting base 400 into the fourth through hole 3014. The portion of the sealing plug 303 inserted into the fourth through hole 3014 is provided with a third annular seal 305 between the sidewall of the fourth through hole 3014. Figure 2 and Figure 4 As shown, the shock absorber also includes a sealing plug 303 extending from the connecting base 400 into the fourth through hole 3014, and the portion of the sealing plug 303 inserted into the fourth through hole 3014 is provided with a third annular seal 305 between the sidewall of the fourth through hole 3014. By providing the fourth through hole in the rod body and the sealing plug matched therewith, a certain force can be applied to the inside of the piston rod in the transverse direction, so that the nesting of the rod body and the first recess and the nesting of the inner tube and the second recess are more stable, and it is beneficial to the connection and sealing of the corresponding fluid passages.

[0051] As shown in Figure 2 and Figure 3 The end face of the inner tube 302 at the first end of the piston rod 300 and the bottom face of the second recess 421 are provided with a gasket 306, and the third fluid passage 430 includes an opening 4301 located at the bottom face of the second recess 421 to communicate with the first fluid passage 311. For example, the gasket 306 can be a copper gasket, and the cross-sectional shape of any position in the circumferential direction can be inverted L-shaped, however, embodiments according to the present application are not limited thereto.

[0052] As shown in Figure 2 The third fluid passage 430 and the fourth fluid passage 440 respectively extend to the opposite side of the mounting side of the connecting base 400 (i.e., Figure 2The upper side of the connecting base shown in the diagram, and the ends of the third fluid channel 430 and the fourth fluid channel 440 on the opposite sides respectively include external oil passage interfaces 4301 and 4401. For example, external oil passage interface 4301 is part of the third fluid channel 430, and external oil passage interface 4401 is part of the fourth fluid channel 440. The inner diameter of the external oil passage structure 4301 and external oil passage interface 4302 can be larger than the inner diameter of other parts of the third fluid channel 430 and the fourth fluid channel 440. External oil passage interfaces 4301 and 4401 can be configured to connect to external devices, for example, connecting components can be provided in the external oil passage interfaces and connected to the external devices via pipelines.

[0053] like Figure 2 As shown, the third fluid channel 430 includes a first segment 431, a second segment 432, and a third segment 433 connected in sequence. The first segment 431 and the third segment 433 extend substantially parallel to the axial direction of the piston rod, and the second segment 432 extends substantially perpendicular to the axial direction of the piston rod. The first segment 431 extends to the opposite side of the mounting side of the connecting base, and the third segment extends to the bottom surface of the second recess 421. The fourth fluid channel 440 includes a fourth segment 444 and a fifth segment 445 connected in sequence. The fourth segment 444 extends substantially parallel to the axial direction of the piston rod, and the fifth segment 445 extends substantially perpendicular to the axial direction of the piston rod. The fourth segment 444 extends to the opposite side of the mounting side of the connecting base, and the fifth segment extends to the sidewall of the first recess 411.

[0054] For example, such as Figure 2 and Figure 3 As shown, both the second segment 432 and the fifth segment 445 extend to the outer surface of the connecting base 400, and the openings of the second segment 432 and the fifth segment 445 on the outer surface of the connecting base are sealed by sealing plugs. As described above, each of the third fluid channel and the fourth fluid channel includes multiple segments as described above, and both the second segment and the fifth segment include openings extending to the outer surface of the connecting base. Therefore, each segment of the third fluid channel and the fourth fluid channel includes an opening extending to the outer surface of the connecting base. For example, the first segment 431 includes an opening on the upper surface of the connecting base, the second segment 432 includes an opening on the outer surface of the connecting base, the third segment 432 includes an opening on the bottom surface of the second recess 421, the fourth segment 444 includes an opening on the upper surface of the connecting base, and the fifth segment 445 includes an opening on the outer surface of the connecting base. In this case, the segments of each fluid channel can be easily machined on the outer surface of the connecting base by machining, thereby forming an integral fluid channel.

[0055] In some embodiments according to this utility model, such as Figure 1As shown, the shock absorber further comprises an oil seal structure 500. The oil seal structure 500 is mainly used to prevent the leakage of oil inside the shock absorber, while preventing the entry of external dust, impurities and moisture into the shock absorber. For example, the oil seal structure 500 can include a sealing ring, a spring and a support, etc. The sealing ring is generally made of oil-resistant, high-temperature-resistant and wear-resistant rubber or composite material, which is in close contact with the surface of the piston rod to ensure the sealing effect. The spring provides appropriate pressure to ensure that the sealing ring always adheres to the piston rod. The support provides structural support for the oil seal and ensures that it is fixed to the shock absorber housing. According to the embodiments of the present application, the specific structure of the oil seal structure is not particularly limited. The oil seal structure 500 is arranged inside the cylinder barrel 100 and located on the side of the piston 300 away from the first chamber 101, the piston rod 300 penetrates the oil seal structure 500, and the second through hole 3012 is located between the piston 200 and the oil seal structure 500 in the axial direction of the piston rod. Through the above arrangement, the first chamber 101 is the space below the piston, the second chamber 102 is the space between the piston 200 and the oil seal structure 500, and the second through hole 3012 is located in the second chamber.

[0056] In some embodiments according to the present application, as shown in Figure 1 As shown, the shock absorber further comprises a first support 501 located on the outer side of the connecting base 400 and a second support 502 located on the outer side of the cylinder barrel 100, and an elastic member 600 sleeved outside the cylinder barrel 100, both ends of the elastic member 600 abutting against the first support 501 and the second support 502 respectively. For example, the elastic member 600 is a spring structure. For example, the spring structure can be a coil spring, which provides elasticity through the spiral shape.

[0057] For example, in some embodiments according to the present application, the connecting base can be an integrated structure. For example, it can be formed by machining various connecting passages on an integrated whole member. For example, the connecting base can be made of carbon steel, alloy steel, aluminum alloy, cast iron or engineering plastic, etc., which can be selected according to different performance requirements and economy. These materials can all be machined to manufacture the above-mentioned various fluid channels, and processed by drilling, reaming and tapping, etc. In this case, on the one hand, the structural stability of the connecting base is ensured, and on the other hand, it is also conducive to the simplification of the assembly process. The connecting base will be described in more detail below in combination with some views of the base structure.

[0058] Figure 5 is a perspective structural schematic view of the connecting base of the shock absorber according to an embodiment of the present application, Figure 6 is a side view of the shock absorber according to an embodiment of the present application, Figure 7 is a cross-sectional view taken along Figure 6 As shown, the shock absorber further comprises a first support 501 located on the outer side of the connecting base 400 and a second support 502 located on the outer side of the cylinder barrel 100, and an elastic member 600 sleeved outside the cylinder barrel 100, both ends of the elastic member 600 abutting against the first support 501 and the second support 502 respectively. For example, the elastic member 600 is a spring structure. For example, the spring structure can be a coil spring, which provides elasticity through the spiral shape. Figure 8 is a cross-sectional view taken alongFigure 6 A cross-sectional view taken along the line BB is shown. As Figure 5 shown, the base 400 includes a disc structure at the bottom and two post structures at one side of the disc structure and a connecting portion connecting the two post structures. The disc structure includes the annular wall, the first recess, the annular protrusion and the second recess as described above, which are at the bottom of the disc structure, so they are not shown in Figure 5 , and the detailed description of these structures can be referred to the illustrations and descriptions of Figures 1-3 . The first segment 431 of the third fluid passage 430 and the fourth segment 444 of the fourth fluid passage 440 are at least partially located in the two post structures. The second segment 432 of the third fluid passage 430 is at least partially located in the connecting portion between the two post structures. The fifth segment 445 of the fourth fluid passage 440 is located in the disc structure to extend to the first recess 411.

[0059] As Figure 6 and Figure 7 shown, Figure 7 the position of the cross-section is located at the two post structures and the connecting portion between the two post structures, and passes through the second segment of the third fluid passage. In Figure 7 the cross-sectional structure view shown, the first segment 431 and the second segment 432 of the third fluid passage and the fourth segment 444 of the fourth fluid passage can be seen. For example, the first segment 431 and the fourth segment 444 are located in the two post structures respectively. Figure 8 The position of the cross-section is located at the disc structure and passes through the fifth segment of the fourth fluid passage. In Figure 8 the cross-sectional structure view shown, the third segment 433 of the third fluid passage and the fourth segment 444 and the fifth segment 445 of the fourth fluid passage can be seen. For example, it can also be seen in Figure 5 and Figure 8 that the part of the disc structure outside the post structures and the connecting portion also includes holes, which are used to connect screws and other components, which will not be described in detail here. In combination with the perspective structure view shown in Figures 5-8 and the cross-sectional structure view, and Figures 1-4The skilled in the art can clearly understand the structure of the connecting base from the sectional structure schematic diagram. The positional relationship between the first recess, the second recess, the annular wall and the annular protrusion in the connecting base and the third fluid channel and the fourth fluid channel can ensure the accurate communication between the fluid channels in the connecting base and the corresponding fluid channels in the piston rod during the connecting process of the connecting base and the piston rod. It should be noted that the specific structure of the connecting base in the figure is only exemplary. For example, the form that the two column structures of the connecting base are formed on the disc structure is only according to some embodiments of the present application. The connecting base of the shock absorber according to the embodiments of the present application is not limited to the above specific form with two column structures. As long as the connecting base has the above fluid channels and different recesses to connect the fluid channels of the piston rod and is assembled with the piston rod, it can have any other suitable form.

[0060] As described above, the first end of the piston rod 300 is installed in cooperation with the mounting side of the connecting base 400, and the communication of the first fluid channel 311 and the second fluid channel 312 with the third fluid channel 430 and the fourth fluid channel 440 is completed on the basis of the fixation of the piston rod 300 and the connecting base 400 to each other. At the second end of the piston rod 300 (i.e., the end connected with the piston), the rod body 301 and the inner tube 302 of the piston rod 300 are also fixed to each other, so as to maintain the relative fixation of the rod body 301 and the inner tube 302. Figure 9 is a partial sectional structure schematic diagram of the second end of the piston rod in the shock absorber according to the embodiments of the present application. As shown in the figure, Figure 9 At the second end of the piston rod 300, the rod body 301 and the inner tube 302 are fixed to each other by the first fixing member 3201. The first fixing member 3201 is a circular ring structure, and the inner wall of the first fixing member 3201 is provided with a step structure, and the top end of the inner tube 302 abuts against the step structure of the first fixing member 3201. A gasket 307 can be arranged between the top end of the inner tube 302 and the step structure, for example, the gasket 307 is a copper gasket. For example, the cross-sectional shape of the gasket 307 at any position in the circumferential direction is L-shaped. At least a part of the first fixing member 3201 is arranged between the inner tube 302 and the rod body 301. For example, the outer side surface of the first fixing member 3201 has a threaded structure, and the inner side surface of the rod body 301 has an internal thread structure in the portion matched with the outer side surface of the first fixing member 3201, so that the first fixing member 3201 and the rod body 301 can be connected by threads, thereby relatively fixing the inner tube 302 and the rod body 301 to each other at the second end of the piston rod 300. In addition, a sealing ring 307 can also be arranged between the inner side surface of the first fixing member 3201 and the outer side surface of the inner tube 302. Furthermore, at the second end of the piston rod 300, a sleeve is arranged on the outside of the rod body 301 and located on the side of the piston 300 away from the second chamber 102 (i.e., the side of the piston 300 close to the first chamber 101), and the sleeve is provided with a threaded structure. The outer side surface of the rod body 301 is provided with an internal thread structure matched with the threaded structure of the sleeve, so that the sleeve and the rod body 301 can be connected by threads, thereby relatively fixing the sleeve and the rod body 301 to each other at the second end of the piston rod 300. Figure 8The second fixing member 308 can be used to fix the piston rod and the piston relative to each other. For example, another fixing member is sleeved outside the piston rod on the upper side of the piston 200, and the another fixing member and the second fixing member 308 together fix the piston and the piston rod relative to each other. It should be noted that the second end of the piston rod 300 is fixed to the piston 200, and the second end herein is not limited to the end face of the piston rod 300, but can be a part adjacent to the end face, which can extend to the side of the piston 200 facing the first chamber 101.

[0061] According to the above description of the embodiments of the utility model, it can be known that the rod body with the axial through hole and the inner tube in the through hole in the piston rod of the shock absorber are fixed relative to each other at both ends of the piston rod, and thus the first fluid passage in the inner tube and the second fluid passage between the inner tube and the inner side surface of the rod body are formed. The fluid passage is simple in design and easy to assemble. The external device can be communicated with the first chamber and the second chamber through the first fluid passage and the second fluid passage respectively, so that the two chambers can be directly injected or sucked with fluid, and the shock absorbing performance of the shock absorber can be directly adjusted.

[0062] It should be noted that the above is only a description of some embodiments of the utility model. Some components can be added or reduced in the above-described shock absorber example. For example, Figure 1 The corrugated tube sleeved outside the cylinder barrel 100 is also shown in the shock absorber in the utility model, and the corrugated tube plays a dustproof role. The shock absorber in the utility model can also include a piston rod 300, and the piston rod 300 is fixed to the piston 200. Figure 1 The buffer structure is also shown in the shock absorber in the utility model, which is located below the connecting base and is sleeved on the piston rod 300, and the buffer structure can buffer the impact between the connecting base and the upper side of the cylinder barrel. Other positioning structures or connecting structures can also be included on the periphery or upper side of the connecting base.

[0063] According to some embodiments of the utility model, a suspension system is also provided, which includes the shock absorber according to any of the above embodiments and a pump. The input end and the output end of the pump are communicated with the first fluid passage and the second fluid passage of the shock absorber respectively, so as to be communicated with the first chamber and the second chamber respectively. The pump can dynamically adjust the flow and pressure difference of the hydraulic oil between the two chambers, so as to change the damping characteristics of the shock absorber. For example, the input end and the output end of the pump are connected to the external oil path interfaces of the third fluid passage and the fourth fluid passage respectively, so as to be connected to the first fluid passage and the second fluid passage through the third fluid passage and the fourth fluid passage respectively.

[0064] In addition, the embodiment of the utility model also provides a vehicle, the vehicle includes the shock absorber according to any embodiment described above. For example, the shock absorber can be used in the suspension system of the automobile, the suspension system can also include pump structure and the like, the pump can be communicated with the first fluid passage and the second fluid passage of shock absorber, for example, through the third fluid passage and the fourth fluid passage on the connecting base. The pump structure can control the shock absorbing performance of shock absorber. For example, the rod cavity and the rodless cavity in the shock absorber cylinder are connected to the external pump structure through the pipeline respectively, and the pump changes the damping characteristics of the shock absorber by adjusting the hydraulic pressure difference between the two cavities, thereby adjusting the shock absorbing performance. For example, the liquid flow and pressure distribution are controlled by the pump: when the pump structure changes the flow rate or direction of hydraulic oil between the rod cavity and the rodless cavity, the damping force in the shock absorber is adjusted, thereby adapting to different road conditions or driving requirements, and realizing the dynamic optimization of the stability and comfort of the vehicle.

[0065] It should be pointed out that the specific embodiments of the utility model are only provided for illustrating the principles and technical features of the utility model, and absolutely do not constitute the limitation of the utility model. Those skilled in the art can make various modifications and improvements to the specific embodiments within the spirit and scope of the utility model. In particular, for different application scenarios and implementation requirements, the specific structure can be reasonably adjusted to adapt to the actual requirements without deviating from the essential content of the utility model. Therefore, all equivalent replacements or improvements within the core idea of the utility model should be regarded as belonging to the protection scope of the utility model.

Claims

1. A shock absorber characterized by, Comprising: a cylinder, a piston located inside the cylinder to separate an inner space of the cylinder into a first chamber and a second chamber, and configured to move in an axial direction of the cylinder, a piston rod located at least partially inside the cylinder and connected to the piston, wherein the piston rod comprises a rod body, the rod body comprising a first through-hole extending through in an axial direction thereof, the piston rod further comprising an inner tube disposed in the first through-hole, the inner tube having a gap with an inner wall of the first through-hole, an inside of the inner tube defining a first fluid passage, the gap between the inner tube and the inner wall of the first through-hole defining a second fluid passage, the first fluid passage being in communication with the first chamber, the second fluid passage being in communication with the second chamber.

2. The shock absorber of claim 1, wherein the piston rod comprising a first end and a second end opposite to each other, the second end of the piston rod being connected to the piston, and the first end of the piston rod being located at a side of the piston away from the first chamber, the first fluid passage and the second fluid passage both extending to the first end of the piston rod.

3. Shock absorber according to claim 1 or 2, characterized in that the rod body comprising a second through-hole extending in a radial direction thereof, the second through-hole being located at a side of the piston away from the first chamber, the second fluid passage being connected to the second chamber through the second through-hole.

4. The shock absorber of claim 2 wherein, Further comprising: a connecting base comprising a third fluid passage and a fourth fluid passage inside, the connecting base being connected to the first end of the piston rod, the third fluid passage being in communication with the first fluid passage, the fourth fluid passage being in communication with the second fluid passage.

5. The shock absorber of claim 4 wherein, the connecting base comprising a mounting side comprising an annular wall, the annular wall surrounding a first recess, the first recess having an annular protrusion disposed on a bottom surface thereof, the annular protrusion surrounding a second recess, the third fluid passage extending to the second recess, the fourth fluid passage extending to the first recess, a portion of the rod body located at the first end of the piston rod being embedded in the first recess, a portion of the inner tube located at the first end of the piston rod and the annular protrusion being nested with each other, so that the third fluid passage is in communication with the first fluid passage, and the fourth fluid passage is in communication with the second fluid passage.

6. The shock absorber of claim 5 wherein, a portion of the inner tube located at the first end of the piston rod being embedded in the second recess, and an outer side surface of the portion of the inner tube embedded in the second recess being fitted with an inner side surface of the annular protrusion.

7. The shock absorber of claim 5 wherein, an outer side surface of the portion of the rod body embedded in the first recess being fitted with an inner side surface of the annular wall, the portion of the rod body embedded in the first recess comprising a third through-hole extending from an inner wall of the first through-hole of the rod body to the outer side surface of the rod body, the fourth fluid passage being in communication with the second fluid passage through the third through-hole.

8. The shock absorber of claim 7, wherein a first annular seal and a second annular seal being disposed between the outer side surface of the portion of the rod body embedded in the first recess and the inner side surface of the annular wall, the first annular seal and the second annular seal being respectively located at two sides of the third through-hole in an axial direction of the piston rod.

9. The shock absorber of claim 7 wherein, The rod body further comprises a fourth through hole connecting the third through hole and an end face of the rod body located at a first end of the piston, and the shock absorber further comprises a sealing plug extending from inside the connecting base into the fourth through hole, and a third annular sealing member is arranged between the portion of the sealing plug inserted into the fourth through hole and the inner wall of the fourth through hole.

10. The shock absorber of claim 6 wherein, A gasket is arranged between the end face of the inner tube located at the first end of the piston rod and the bottom face of the second recess, and the third fluid channel comprises an opening at the bottom face of the second recess to communicate with the first fluid channel.

11. The shock absorber of claim 5 wherein, The third fluid channel and the fourth fluid channel respectively extend to opposite sides of the mounting side of the connecting base, and the third fluid channel and the fourth fluid channel respectively comprise an external oil passage interface at the end of the opposite sides.

12. The shock absorber of claim 5 wherein, The third fluid channel comprises a first section, a second section and a third section connected in sequence, the first section and the third section extend substantially parallel to the axial direction of the piston rod, the second section extends substantially perpendicular to the axial direction of the piston rod, the first section extends to the opposite side of the mounting side of the connecting base, and the third section extends to the bottom face of the second recess. The fourth fluid channel comprises a fourth section and a fifth section connected in sequence, the fourth section extends substantially parallel to the axial direction of the piston rod, the fifth section extends substantially perpendicular to the axial direction of the piston rod, the fourth section extends to the opposite side of the mounting side of the connecting base, and the fifth section extends to the side wall of the first recess.

13. The shock absorber of claim 12, wherein The second section and the fifth section both extend to the outer side face of the connecting base, and the openings of the second section and the fifth section located at the outer side face of the connecting base are sealed by sealing plugs.

14. The shock absorber of claim 3 wherein, Further comprising an oil seal structure arranged in the cylinder and located on the side of the piston away from the second cavity, the piston rod penetrates through the oil seal structure, and the second through hole is located between the piston and the oil seal structure in the axial direction of the piston rod.

15. The shock absorber of claim 4 wherein, Further comprising a first support located at the outer side face of the connecting base and a second support located at the outer side face of the cylinder, and an elastic member sleeved outside the cylinder, two ends of the elastic member respectively abut against the first support and the second support.

16. A suspension system characterized by, The shock absorber according to any one of claims 1-15 and a pump, an input end and an output end of the pump respectively communicate with the first fluid channel and the second fluid channel of the shock absorber.

17. A vehicle characterized by comprising: The shock absorber according to any one of claims 1-15.

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