Shock absorber and vehicle

Abstract

The utility model relates to the technical field of automobile damping, and particularly provides a damper and a vehicle. The shock absorber comprises an upper supporting part, a piston shell and a piston rod connected to the upper supporting part, wherein the upper supporting part and the piston shell are arranged up and down at an interval. Wherein a piston cavity is formed in the piston shell, a plug body is arranged at the bottom of the piston rod, and the plug body is arranged in the piston cavity in a sliding mode; moreover, the piston shell comprises an inner shell used for defining a piston cavity and an outer shell arranged outside the inner shell in a sleeving mode, a heat dissipation structure is arranged in a cavity formed between the inner shell and the outer shell, and the heat dissipation structure forms a heat dissipation channel between the inner shell and the outer shell. According to the shock absorber, the heat dissipation structure is arranged in the cavity between the inner shell and the outer shell, a good heat dissipation channel is provided for heat on the inner shell to be transmitted to the outer shell and the outside of the outer shell, the heat dissipation efficiency of the piston shell can be improved, and therefore the heat dissipation effect of the shock absorber can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile damping, particularly relates to a damper. BACKGROUND

[0002] The damper is a commonly used damping device on a vehicle and a device with vibration, and has an important damping effect on the smooth driving of the vehicle and the good operation of the device. For example, the damper with an air spring structure can contract and stretch in the height dimension by means of the compressed gas in the air bag during the process of bearing the bumping and vibration impact of the vehicle, thereby achieving a good damping effect.

[0003] However, a large amount of heat is generated when the vehicle works for a long time under the bumping road condition, and when the temperature of the damper exceeds the working temperature for a long time, the sealing element (rubber) and the like will fail, and problems such as oil leakage and reduced damping effect will occur.

[0004] After the damper is increased with the air spring structure, the air spring and the related external structure will wrap most of the damper, the damper cannot be in direct contact with the air for heat dissipation, heat accumulation is generated when the damper vibrates frequently, the temperature rises fast, and the heat dissipation is slow, so the working temperature is easily exceeded and the rubber and the like fail and leak oil. SUMMARY

[0005] Therefore, the utility model aims at providing a damper to improve the heat dissipation effect of the damper.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] A damper comprises an upper support part and a piston shell arranged in an upper and lower interval, and a piston rod connected to the upper support part; the piston shell is internally formed with a piston cavity, the bottom of the piston rod is provided with a plug body, and the plug body is slidingly arranged in the piston cavity; the piston shell comprises an inner shell for surrounding the piston cavity, and an outer shell sleeved outside the inner shell, and a heat dissipation structure is arranged in the cavity formed between the inner shell and the outer shell.

[0008] Further, in the direction from bottom to top, the radial dimension of the upper part of the outer shell is gradually increased.

[0009] Further, the heat dissipation structure comprises a plurality of heat dissipation fins integrally formed on the outer wall of the inner shell, and the outer side edge part of each heat dissipation fin is attached to the inner wall of the outer shell.

[0010] Further, the inner shell is in a cylindrical shape, and each heat dissipation fin is located on the axial section of the inner shell.

[0011] Further, the fins are evenly distributed along the circumference of the inner shell.

[0012] Further, a buffer assembly is arranged on the piston rod, and the buffer assembly can form a buffer between the piston body and the top of the piston cavity during the upward movement of the piston rod relative to the piston shell.

[0013] Further, an air bag is arranged between the upper support part and the piston shell, and the air bag is covered by a protective cylinder, and a dust cover is arranged outside the piston shell; the top of the dust cover is connected to the protective cylinder, the bottom of the dust cover is sleeved on the piston shell, and the bottom of the dust cover is provided with an exhaust passage which is in communication with a dustproof cavity formed between the dust cover and the piston shell.

[0014] Further, the bottom of the dust cover is provided with a dust cover lower tray which is mounted on the piston shell and supports the bottom of the dust cover; the exhaust passage is arranged through the dust cover lower tray and the dust cover below the dust cover lower tray.

[0015] Further, the dust cover lower tray comprises two semicircular plates which are mounted on the piston shell in a clamping manner, and the outer edges of the plates are inserted into grooves formed on the inner wall of the dust cover; the exhaust passage comprises tray exhaust holes arranged at the inner edge of the plate and lower exhaust holes arranged at the bottom edge of the dust cover.

[0016] Compared with the prior art, the shock absorber has the following advantages:

[0017] (1) The shock absorber of the utility model, in view of the fact that the piston cavity needs to be arranged inside the piston shell, and the dust cover needs to be matched and connected between the upper support part and the piston shell, the piston shell adopts a sleeved structure of an inner shell and an outer shell, the up-and-down sliding of the piston rod inside the piston cavity and the compression of the gas in the piston cavity will generate heat, causing the inner shell to heat up, and by arranging a heat dissipation structure in the chamber between the inner shell and the outer shell, a good heat dissipation channel is provided for the heat in the inner shell to transfer to the outer shell and the outside, which can improve the heat dissipation efficiency of the piston shell, thereby being beneficial to improving the heat dissipation effect of the shock absorber.

[0018] (2) The upper part of the outer shell adopts an inverted frustum shape, which not only can make the lower part of the outer shell taper to fit the outer wall of the inner shell, realizing the closed connection of the bottom of the piston shell, but also can make the top of the outer shell have a larger radial dimension, which is more close to the radial dimension of the upper support part, thereby facilitating the arrangement of the dust cover between the upper support part and the piston shell, so as to form an air chamber surrounded by the dust cover between the upper support part and the piston shell, thereby forming a good air spring damping structure.

[0019] (3) The heat dissipation structure adopts the form of multiple heat dissipation fins, which is convenient for integrated processing on the outer wall of the inner shell; by attaching the outer edges of the heat dissipation fins to the inner wall of the outer shell, each heat dissipation fin can simultaneously conduct heat to the outer shell while dissipating heat from the inner shell into the chamber, thereby the heat dissipation structure has the characteristics of convenient processing and excellent heat conduction performance.

[0020] (4) Each heat dissipation fin is arranged on the axial section of the inner shell, which makes the arrangement of each heat dissipation fin on the inner shell more standardized, facilitating the manufacturing of related grinding tools and the molding and demolding of the inner shell.

[0021] (5) Each heat dissipation fin is arranged in a uniformly spaced manner, which can make the overall heat conduction performance of the heat dissipation structure more balanced, thereby improving the heat conduction efficiency and facilitating the integrated processing of the inner shell and its heat dissipation fins.

[0022] (6) By sleeving the buffer assembly on the piston rod, the buffer assembly can form a good buffering effect between the piston body and the top of the piston shell during the up and down movement of the piston rod relative to the piston shell. Especially during the rebound process after the shock absorber is pressed down, the top of the buffer assembly can form a good buffering effect when it contacts the top of the piston cavity, preventing the shock absorber from generating a large impact during the rebound process, thereby improving the use effect and service life of the shock absorber.

[0023] (7) The air bag is arranged between the upper support part and the piston shell, and the air chamber is formed by the upper support part, the air bag, and the top of the piston shell. The air chamber changes with the height dimension when the height of the shock absorber changes, forming a good air spring buffering structure. The air bag is provided with a protective sleeve, which can provide good protection for the air bag to prevent it from being scratched and broken. The dust cover is arranged on the protective sleeve and extends downward from the bottom of the protective sleeve, which can wrap the middle and lower parts of the piston shell to prevent external dust from adhering to the piston shell, thereby improving the dustproof effect of the shock absorber.

[0024] (8) The dust cover lower tray is arranged at the bottom of the dust cover, which can surround the lower part of the piston shell to support the bottom of the dust cover. This provides a good mounting method for the assembly and fixation of the dust cover bottom at the lower part of the piston shell.

[0025] (9) the dust cover lower tray adopts two half-circular disc plates which are combined, can be conveniently clamped in the annular groove on the outer wall of the piston shell in a clamping mode, can be clamped from the outside of the dust cover lower tray by means of the groove arranged on the inner wall of the dust cover, so that the dust cover lower tray can be well supported between the dust cover and the piston shell, the support on the bottom of the dust cover and the sealing of the dust cover are formed. Further, a notch is arranged at the inner edge of the disc plate, the notch is preferably processed into a semicircular shape, so that a plurality of semicircular tray exhaust holes are formed between the disc plate and the piston shell, and a semicircular notch-shaped lower exhaust hole is arranged at the edge of the bottom of the dust cover in correspondence, the tray exhaust hole and the lower exhaust hole are communicated to form an exhaust passage; in this way, the hot gas in the dust cover can be discharged due to the contraction of the dust cover when the shock absorber is pressed down, and the dust cover lower tray is blown, and the excellent heat conductivity of the dust cover lower tray is used to accelerate heat dissipation.

[0026] Another purpose of the utility model lies in providing a vehicle, the vehicle is equipped with the shock absorber of the utility model. The vehicle of the utility model has the technical advantages of the above shock absorber. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings constituting a part of the utility model are used to provide further understanding of the utility model, the illustrative embodiment of the utility model and its explanation are used to explain the utility model, the front and back, up and down and other orientation words involved are only used to show relative position relation, all do not constitute undue limitation to the utility model. In the drawings:

[0028] Figure 1 It is the overall three-dimensional structure schematic view of the shock absorber of the utility model embodiment;

[0029] Figure 2 It is the front view of the shock absorber of the utility model embodiment;

[0030] Figure 3 It is Figure 2 It is the sectional structure schematic view of the part shown in A-A;

[0031] Figure 4 It is the partial split structure schematic view of the shock absorber of the utility model embodiment;

[0032] Figure 5 It is the dust cover and dust cover lower tray assembly structure schematic view of the utility model embodiment;

[0033] Figure 6 It is the dust cover and dust cover lower tray split structure schematic view of the utility model embodiment;

[0034] Figure 7The utility model discloses a piston rod, inner shell and the whole structure schematic diagram of heat radiation structure of outer layer inner shell.

[0035] Figure 8 The utility model discloses a piston rod, inner shell and the whole structure schematic diagram of heat radiation structure of outer layer inner shell.

[0036] Figure 9 For Figure 8 The top view of the component shown.

[0037] Mark explanation:

[0038] 1, upper support part;10, connecting piece;11, buffer block;12, gas injection port;

[0039] 2, air bag;20, air chamber;3, protection tube;

[0040] 4, piston rod;40, plug body;41, buffer spring;410, lower pad;411, upper pad;

[0041] 5, piston shell;50, piston cavity;51, inner shell;510, outer layer inner shell;511, main inner shell;512, inner layer inner shell;52, outer shell;520, chamber;53, heat radiation structure;541, first fixed support;542, second fixed support;543, third fixed support;

[0042] 6, dust cover;60, dustproof cavity;61, dust cover lower tray;610, tray exhaust hole;62, recess;63, lower exhaust hole;

[0043] 7, gas pipeline;70, conversion valve;71, gas guide channel. Specific implementation

[0044] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0045] In the description of the utility model, it should be declared that if the terms such as "upper, lower, left, right, front, rear, inner and outer" indicating orientation or positional relationship appear, it is the orientation or positional relationship shown in the drawing, and it is only for the convenience of describing the utility model, and it does not indicate or imply that the device or element must have a specific orientation, be constructed or operated in a specific orientation, so it cannot be understood as a limitation on the utility model.

[0046] Moreover, in the description of the utility model, unless otherwise expressly limited, the terms "mounting", "connecting", "connection", "connector" should be understood broadly. For example, the connection can be fixed connection, or detachable connection, or integrally connected; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate media, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances. In the description of the utility model, the limiting terms such as "first", "second", "A", "B", "C", "D" and the like appear, which are only for distinguishing the same features of different positions, attributions or purposes, to avoid ambiguity and confusion, and cannot be understood as indicating or implying relative importance.

[0047] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0048] Embodiment one

[0049] The embodiment relates to a shock absorber, which is generally applied to a vehicle and can improve the heat dissipation effect of the shock absorber.

[0050] The shock absorber is a common damping device on a vehicle and a device with vibration, and has important damping effect on the smooth driving of the automobile and the good operation of the device. In the shock absorber with air spring structure, the air bag can contract and stretch in height dimension in the process of bearing the bumping vibration impact of the vehicle, so that good damping effect is achieved.

[0051] The shock absorber can well play the damping effect on the vehicle due to the upward and downward buffering movement of compression and rebound in the working process; when the vehicle is driven for a long time on the bumping road, the shock absorber works frequently and generates a large amount of heat, and if the temperature of the shock absorber exceeds the working temperature for a long time, the sealing element (rubber) and the like will fail, and problems such as oil leakage and reduced damping effect will occur.

[0052] The shock absorber in the prior art, after increasing the air spring structure, the air spring and the related external structure can wrap most of the shock absorber, so that the shock absorber cannot directly contact the atmosphere for heat dissipation, heat accumulation is generated when the shock absorber vibrates frequently, the temperature rises fast, and the heat dissipation is slow; therefore, the working temperature is easily exceeded and the rubber and the like fail and leak oil.

[0053] The shock absorber of the embodiment is designed to overcome the deficiencies in the prior art, and the overall structure is as shown in Figure 1 、 Figure 2 and Figure 3 .

[0054] Specifically, the damper of the embodiment comprises an upper support part 1 and a piston housing 5 arranged in an upper and lower interval, and a piston rod 4 connected to the upper support part 1. Wherein, the piston housing 5 is internally formed with a piston cavity 50, and the bottom of the piston rod 4 is provided with a plug body 40 which is slidingly arranged in the piston cavity 50. At the same time, the piston housing 5 comprises an inner shell 51 for surrounding the piston cavity 50, and an outer shell 52 sleeved outside the inner shell 51, and a heat dissipation structure 53 is arranged in the cavity 520 formed between the inner shell 51 and the outer shell 52, which forms a heat dissipation channel between the inner shell 51 and the outer shell 52.

[0055] It should be pointed out that based on the overall design idea described above, the technical scheme of the utility model can adopt various different specific implementation structures, forms or configuration sequences. For example, the piston housing 5 described above can adopt different external shape structure forms such as a cylindrical shape, a conical frustum shape, etc. The air bag 2 between the upper support part 1 and the piston housing 5 can be made of different materials or have different structure forms. The specific arrangement sequence, assembly mode, etc. of the upper support part 1, the air bag 2, the piston housing 5, the piston rod 4, etc. can also be flexibly adjusted. For the parts required for the overall scheme implementation but not involved in the overall arrangement described above, reasonable and flexible design can be made by referring to the mature setting means in the field, the actual situation during implementation, etc. The specific implementation scheme described below in the embodiment is only one of the relatively optimal schemes formed by various combinations and changes of the above, and in actual implementation, the person skilled in the art can make flexible adjustment and improvement in combination with the actual situation. Obviously, the various specific form combinations and changes of the above can form many schemes, and the specific implementation scheme of the embodiment is within the protection scope of the utility model.

[0056] Specifically, in the embodiment, as shown in Figure 3 and in combination with Figure 4 It is shown that the upper part of the outer shell 52 adopts an inverted conical frustum shape, that is, the radial dimension of the upper part of the outer shell 52 gradually increases in the direction from the bottom to the top of the damper; in this way, the cavity 520 described above is mainly formed between the upper part of the outer shell 52 and the inner shell 51, and in the case that the radial dimension of the inner shell 51 is consistent in the upper and lower directions, the cavity 520 between the outer shell 52 and the inner shell 51 has a larger upper dimension and a gradually narrowing lower dimension. The heat dissipation structure 53 described above can be arranged along the axial direction of the inner shell 51, and in view of the above situation of the internal space of the cavity 520, the heat dissipation structure 53 can be mainly distributed at the upper-middle position of the cavity 520.

[0057] The upper part of the outer shell 52 is in the form of an inverted frustum, which not only makes the caliber of the lower part of the outer shell 52 tight so as to be fitted with the outer wall of the inner shell 51 and realize the closed connection of the bottom of the piston shell 5, but also makes the top part of the outer shell 52 have a larger radial dimension, which is closer to the radial dimension of the upper support part 1, so as to facilitate the arrangement of the air bag 2 between the upper support part 1 and the piston shell 5, thereby forming the air chamber 20 surrounded by the air bag 2 between the upper support part 1 and the piston shell 5, so as to form a good air spring damping structure.

[0058] For the specific setting form of the heat dissipation structure 53, of course, there are many different structure schemes to choose from; for example, it can be a liquid with good heat conductivity filled in the chamber 520, or the heat absorption and dissipation area can be increased by selectively setting the heat dissipation structure in the form of protrusions, depressions, cylinders, etc. on the outer wall of the inner shell 51 and the inner wall of the outer shell 52. When the inner shell 51 has a multi-layer structure of the inner layer inner shell 512, the main inner shell 511 and the outer layer inner shell 510, etc., the heat dissipation structure in the form of protrusions, depressions, cylinders, etc. can also be set on the inner side of the outer layer inner shell 510 to increase the heat absorption area and improve the heat dissipation effect between the outer layer inner shell 510 and the inner layer inner shell 512 and the main inner shell 511. The above-mentioned convex-concave heat dissipation structure can be designed in the form of fans in contact with the two side cylinders (wall bodies), or directly processed into densely arranged heat dissipation fins connected between the opposite wall bodies.

[0059] In the present embodiment, as shown in Figure 7 and Figure 8 , the heat dissipation structure 53 includes a plurality of heat dissipation fins integrally formed on the outer wall of the inner shell 51, and the outer side edge part of each heat dissipation fin is fitted with the inner wall of the outer shell 52. The heat dissipation structure 53 adopts the form of a plurality of heat dissipation fins, which is convenient for integral processing on the outer wall of the inner shell 51; by fitting the outer side edge of the heat dissipation fin on the inner wall of the outer shell 52, each heat dissipation fin can not only dissipate the heat on the inner shell 51 into the chamber 520, but also conduct to the outer shell 52, so that the heat dissipation structure 53 has the characteristics of convenient processing and excellent heat conduction performance.

[0060] Based on the above setting, preferably, as shown in Figure 8 , Figure 9 , the inner shell 51 of the present embodiment is designed in the form of a cylinder, and each heat dissipation fin is located on the axial section of the inner shell 51, so that the arrangement of each heat dissipation fin on the inner shell 51 is more standardized, which is convenient for the manufacture of related abrasives and the molding and demolding of the inner shell 51. At the same time, it is preferred that each heat dissipation fin is uniformly distributed along the circumferential direction (i.e. around the axis of the inner shell 51) of the inner shell 51. The uniformly distributed form of each heat dissipation fin can make the overall heat conduction performance of the heat dissipation structure 53 more balanced, thereby improving the heat conduction efficiency, and also facilitating the integral processing of the inner shell 51 and its heat dissipation fins.

[0061] In addition, the inner shell 51 can adopt a single-layer structure or be designed as a multi-layer structure. In the embodiment, the inner shell 51 comprises an inner-layer inner shell 512, a main inner shell 511 and an outer-layer inner shell 510 which are sequentially sleeved from inside to outside. The inner-layer inner shell 512 is mainly used as the inner wall of the piston cavity 50 and needs to provide a smooth inner wall to ensure the smooth guiding movement of the piston body 40 in the piston cavity 50; the main inner shell 511 is used to reinforce the inner-layer inner shell 512; and the outer-layer inner shell 510 is mainly sleeved with the outer shell 52 to build the required shape of the piston shell 5 and form a good external protection effect on the main inner shell 511 and the inner-layer inner shell 512. In order to facilitate the adjustment of the gas pressure in the piston cavity 50, a gas guide pipeline 7 can be arranged at the lower part of the piston shell 5 to pressurize the piston cavity 50 or discharge the pressure in the piston cavity 50, so as to adjust the elastic damping performance between the piston rod 4 and the piston shell 5 and form an adjustable damper structure. Specifically as shown in Figure 1 and in combination with Figure 7 It is shown that the gas guide pipeline 7 is provided with a switching valve 70 which can open and close the gas guide pipeline 7, and the inner shell 51 is provided with a gas guide channel 71 which can realize the communication between the piston cavity 50 and the gas guide pipeline 7.

[0062] The specific arrangement of the upper support part 1 and the components adjacent thereto can be flexibly designed according to the existing damper structure; when the damper is used on a vehicle, the top of the upper support part 1 is required to have good mounting conditions with the vehicle body; the bottom of the upper support part 1 can be provided with a clamp structure for facilitating the mounting of the air bag 2 on the upper support part 1. The piston rod 4 can be fixed at the middle part of the upper support part 1. In view of the arrangement of the air bag 2, a gas injection port 12 can be arranged at the side of the upper support part 1 for injecting gas into the gas chamber 20.

[0063] In the embodiment, the top of the upper support part 1 is provided with a plurality of connecting pieces 10 for connecting the vehicle body. Meanwhile, the bottom of the upper support part 1 is provided with a buffer block 11 which is sleeved on the piston rod 4; when the damper is pressed under impact, the piston shell 5 will move upward relative to the upper support part 1 to approach the upper support part 1, and the buffer block 11 can form a buffering effect between the top of the piston shell 5 and the bottom of the upper support part 1, thereby improving the damping performance of the damper. The bottom of the piston shell 5 can be mounted to the suspension through the connecting pieces for the connection between the damper and the suspension; meanwhile, first, second and third fixed supports 541, 542 and 543 can be arranged at the bottom of the piston shell 5 for the connection and fixation of the piston shell 5 or the mounting of the components adjacent thereto.

[0064] In addition, as shown in Figure 3As shown, the piston rod 4 of the embodiment is further sleeved with a buffering assembly; during the rebounding process after the shock absorber is depressed, the piston shell 5 will move downward relative to the upper support part 1 and move away from the upper support part 1, at this time, the piston rod 4 will move upward relative to the piston shell 5; when moving upward to the limit position, the buffering assembly can form a buffer between the plug body 40 and the top of the piston cavity 50. The above-mentioned buffering assembly of course has various design forms, for example, it can be a rubber sleeve sleeved on the piston rod 4; or it can be a spring. Specifically, the buffering assembly of the embodiment includes an upper pad 411, a buffering spring 41 and a lower pad 410 which are sleeved on the piston rod 4 in sequence from top to bottom. The buffering spring 41 has a good elastic buffering effect, and the lower pad 410 and the upper pad 411 can avoid the hard contact between the buffering spring 41 and the plug body 40 and the piston shell 5, thereby avoiding the surface damage of the metal components such as the piston shell 5 and the plug body 40.

[0065] By sleeving the buffering assembly on the piston rod 4, the buffering assembly can form a good buffering effect between the plug body 40 and the top of the piston shell 5 during the upward and downward movement of the piston rod 4 relative to the piston shell 5. Especially during the rebounding process after the shock absorber is depressed, the top of the buffering assembly can form a good buffering effect when contacting the top of the piston cavity 50, preventing the shock absorber from having a large impact during the rebounding process, thereby improving the use effect and service life of the shock absorber.

[0066] As mentioned above, the upper support part 1 and the piston shell 5 of the embodiment are provided with the air bag 2, and the outer part of the air bag 2 is covered with the protective cylinder 3; based on the arrangement of the air bag 2 and the protective cylinder 3, the outer part of the piston shell 5 of the embodiment is provided with a dust cover 6; the top of the dust cover 6 is connected with the protective cylinder 3, and the bottom of the dust cover 6 is sleeved on the piston shell 5; and the bottom of the dust cover 6 is provided with an exhaust passage which communicates with a dustproof cavity 60 formed between the dust cover 6 and the piston shell 5. Through the exhaust passage, the hot air in the dustproof cavity 60 can be exhausted to the outside, and the cold air outside can also enter the dustproof cavity 60.

[0067] The air bag 2 is arranged between the upper support part 1 and the piston housing 5, and the air chamber 20 is jointly formed by the upper support part 1, the air bag 2 and the top of the piston housing 5. The air chamber 20 changes in size with the height of the shock absorber, and forms a good air spring buffering structure. The air bag 2 is provided with the protective sleeve 3, which can provide good protection for the air bag 2 and prevent the air bag 2 from being damaged and ruptured. The dust cover 6 is arranged on the protective sleeve 3, and the dust cover 6 extends downward from the bottom of the protective sleeve 3 to wrap the middle and lower part of the piston housing 5, thereby preventing dust and the like from adhering to the piston housing 5, and improving the dustproof effect of the shock absorber. In view of the need for heat dissipation of the piston housing 5, in order to prevent heat from accumulating in the dustproof cavity 60 inside the dust cover 6, the exhaust passage is arranged on the bottom of the dust cover 6, and the gas in the dustproof cavity 60 can be discharged to the outside through the exhaust passage, thereby removing the heat accumulated in the dustproof cavity 60. In this way, the dust cover 6 forms a dustproof effect on the shock absorber, and at the same time, the problem of heat dissipation of the piston housing 5 is solved, and the dustproof performance and heat dissipation performance of the shock absorber are ensured.

[0068] As shown in Figure 3 , Figure 4 , the bottom of the dust cover 6 of the embodiment is further provided with a dust cover lower tray 61, which is mounted on the piston housing 5 and supports the bottom of the dust cover 6. Based on the above arrangement, in combination with Figure 5 , Figure 6 , the exhaust passage can be arranged through the dust cover lower tray 61 and the dust cover 6 below the dust cover lower tray 61. By arranging the dust cover lower tray 61 on the bottom of the dust cover 6, the dust cover lower tray 61 can be arranged around the lower part of the piston housing 5, thereby supporting the bottom of the dust cover 6 and providing a good mounting method for the assembly and fixation of the bottom of the dust cover 6 on the lower part of the piston housing 5. Based on the arrangement of the dust cover lower tray 61, the exhaust passage is arranged on the dust cover lower tray 61 and penetrates the dust cover 6 below the dust cover lower tray 61. The hot gas in the dustproof cavity 60 can be blown onto the dust cover lower tray 61 while being discharged from the exhaust passage. In particular, the dust cover lower tray 61 is usually made of metal material, and in the process of blowing hot gas through the dust cover lower tray 61, the dust cover lower tray 61 can fully utilize the characteristic that metal material has good heat dissipation effect, thereby further improving the heat dissipation performance of the shock absorber.

[0069] For the arrangement of the dust cover lower tray 61, there are of course many different structural schemes to choose from; for example, the dust cover lower tray 61 can be arranged as an integral annular disc, which is sleeved on the piston housing 5, so that the dust cover lower tray 61 is supported between the outer wall of the piston housing 5 and the inner wall of the dust cover 6.

[0070] However, in the embodiment, as shown in Figure 4As shown, the lower tray 61 of the dust cover comprises two semicircular plates which are mounted on the piston housing 5 in a clamping manner, and the outer edges of the plates are inserted into the groove 62 formed on the inner wall of the dust cover 6; the exhaust passage comprises the tray exhaust holes 610 provided on the inner edge of the plate and the lower exhaust holes 63 provided on the bottom edge of the dust cover 6; the tray exhaust holes 610 and the lower exhaust holes 63 can be provided in the form of semicircular notches, and the two are sequentially connected to form the exhaust passage.

[0071] The lower tray 61 of the dust cover is composed of two semicircular plates which can be clamped in the annular groove on the outer wall of the piston housing 5 in a clamping manner, and the dust cover 6 can be held from the outside of the lower tray 61 of the dust cover by the groove 62 provided on the inner wall of the dust cover 6, so that the lower tray 61 of the dust cover can be well supported between the dust cover 6 and the piston housing 5 to form a support for the bottom of the dust cover 6 and a seal for the dust chamber 60. Further, notches are provided on the inner edge of the plate, and the notches are preferably processed in the form of semicircles, so that a plurality of semicircular exhaust holes 610 are formed between the plate and the piston housing 5, and a plurality of semicircular lower exhaust holes 63 are correspondingly formed between the bottom edge of the dust cover and the piston housing 5. The hot air inside the dust chamber 60 can be discharged due to the contraction of the dust chamber 60 when the shock absorber is pressed down, and can blow the lower tray 61 of the dust cover, so as to accelerate heat dissipation by the excellent heat conductivity of the lower tray 61 of the dust cover. When the shock absorber rebounds, the volume of the dust chamber 60 recovers, and the external cold air can also enter the dust chamber 60 through the exhaust holes 610 and the lower exhaust holes 63 to reduce the temperature inside the dust chamber 60. It should be pointed out that since the exhaust holes 610 and the lower exhaust holes 63 are both provided on the bottom of the dust cover 6 and open downward, the possibility of external dust and foreign matter entering the dust chamber 60 can be effectively reduced, and when water accumulates in the dust chamber 60, it can be smoothly discharged to the outside of the shock absorber through the exhaust holes 610 and the lower exhaust holes 63.

[0072] In summary, the shock absorber of the present embodiment needs to be matched and connected between the upper support part 1 and the dust cover 6 on the outside of the piston housing 5, and the piston chamber 50 needs to be provided inside the piston housing 5. The piston housing 5 adopts a sleeved structure of the inner shell 51 and the outer shell 52, and the heat generated by the up and down sliding of the piston rod 4 in the piston chamber 50 and the compression of the gas in the piston chamber 50 causes the inner shell 51 to heat up. By providing the heat dissipation structure 53 in the chamber 520 between the inner shell 51 and the outer shell 52, a good heat dissipation channel is provided for the heat of the inner shell 51 to transfer to the outer shell 52 and the outside, which can improve the heat dissipation efficiency of the piston housing 5, thereby being conducive to improving the heat dissipation effect of the shock absorber.

[0073] Embodiment Two

[0074] The embodiment relates to a vehicle, and the vehicle is provided with the shock absorber provided in the embodiment one.

[0075] The shock absorber has the air spring structure in the shock absorber, and good damping effect can be provided; when the piston rod 4 is frequently lifted in the piston shell 5, the outer shell 52 can transfer heat to the inner shell 51 through the heat dissipation structure 53, and then the heat is diffused to the outside of the shock absorber through the dustproof cavity 60 and the exhaust passage at the bottom of the dustproof cavity 60, so that the shock absorber has good heat dissipation effect while meeting the good damping and dustproof performance, and the situation that rubber sealing elements and the like are invalid and oil leaks due to the continuous high temperature of the piston shell 5 is avoided.

[0076] The heat dissipation structure 53 in the piston cavity 50 has the form of a heat dissipation fin, has good processing structure characteristics and heat dissipation effect, and the outer edges of the heat dissipation fins are attached to the inner wall of the outer shell 52, so that the heat in the piston cavity 50 can be smoothly transferred to the outer shell 52, and then diffused to the outside of the shock absorber through the exhaust passage at the bottom of the dustproof cavity 60.

[0077] The exhaust hole 610 at the bottom of the dust cover 6 is arranged on the dust cover lower tray 61, and the mass of the dust cover lower tray 61 can be reduced; the dust cover lower tray 61 is made of metal material, and the efficiency of heat transfer from the dustproof cavity 60 to the outside is further improved, so that the heat dissipation effect is improved. Moreover, since the exhaust passage is located at the bottom of the dust cover 6 and the opening faces downward, the situation that mud or rainwater is mixed into the dustproof cavity 60 is excluded.

[0078] The above is only a preferred embodiment of the utility model, and the detailed configuration explanation, specific structure setting form example, or assembly connection mode expression are all for the need of full disclosure, so that the utility model can be better implemented by the person skilled in the art, and the protection scope of the utility model is not limited. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A shock absorber characterized in that: it comprises an upper support part (1) and a piston housing (5) arranged in an upper-lower direction, and a piston rod (4) connected to the upper support part (1); the piston housing (5) is internally formed with a piston cavity (50), and the bottom of the piston rod (4) is provided with a plug body (40) which is slidingly arranged in the piston cavity (50); the piston housing (5) comprises an inner shell (51) for forming the piston cavity (50), and an outer shell (52) which is sleeved outside the inner shell (51), and a cavity (520) formed between the inner shell (51) and the outer shell (52) is provided with a heat dissipation structure (53).

2. The shock absorber according to claim 1, characterized in that: in a direction from bottom to top, the radial dimension of the upper part of the outer shell (52) is gradually increased.

3. The shock absorber according to claim 1, characterized in that: the heat dissipation structure (53) comprises a plurality of heat dissipation fins which are integrally formed on the outer wall of the inner shell (51), and the outer side edge part of each heat dissipation fin is in abutment with the inner wall of the outer shell (52).

4. The shock absorber according to claim 3, characterized in that: the inner shell (51) is in a cylindrical shape, and each heat dissipation fin is located on the axial section of the inner shell (51).

5. The shock absorber according to claim 4, characterized in that: each heat dissipation fin is uniformly distributed along the circumferential direction of the inner shell (51).

6. The shock absorber according to claim 1, characterized in that: a buffer assembly is sleeved on the piston rod (4), and the buffer assembly can form a buffer between the plug body (40) and the top of the piston cavity (50) during the upward movement of the piston rod (4) relative to the piston housing (5).

7. The shock absorber according to any one of claims 1 to 6, characterized in that: a gas bag (2) is arranged between the upper support part (1) and the piston housing (5), and the outer part of the gas bag (2) is covered with a protective sleeve (3), and a dust cover (6) is arranged outside the piston housing (5); the top of the dust cover (6) is connected to the protective sleeve (3), the bottom of the dust cover (6) is sleeved on the piston housing (5), and the bottom of the dust cover (6) is provided with an exhaust passage which is in communication with a dustproof cavity (60) formed between the dust cover (6) and the piston housing (5).

8. The shock absorber according to claim 7, characterized in that: the bottom of the dust cover (6) is provided with a dust cover lower tray (61) which is mounted on the piston housing (5) and supports the bottom of the dust cover (6); the exhaust passage is arranged through the dust cover lower tray (61) and the dust cover (6) below the dust cover lower tray (61).

9. The shock absorber according to claim 8, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The lower tray (61) of the dust cover comprises two semicircular plates which are mounted on the piston housing (5) in a clamping manner, and the outer edges of the plates are inserted into the grooves (62) formed on the inner wall of the dust cover (6); The exhaust passage comprises tray exhaust holes (610) arranged at the inner edge portions of the plates, and a lower exhaust hole (63) arranged at the bottom edge portion of the dust cover (6).

10. A vehicle, characterized in that: The vehicle is provided with the shock absorber according to any one of claims 1 to 9.

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