Damping connecting structure of dune buggy

Abstract

The invention relates to the technical field of dune buggies, in particular to a damping connecting structure of a dune buggy, which comprises a frame, a suspension and a damping device, the suspension is hinged to the frame, the damping device is arranged between the suspension and the frame, one end of the damping device is hinged to the suspension, and the other end of the damping device is hinged to the frame; the damping device comprises an inner rod, an outer rod and a piston; the piston is fixed with the inner rod, so that a first floating oil cavity is formed between the piston and the first end of the first channel; the protection piece is fixed with the inner rod and is in sliding sealing fit with the outer rod along the axial direction; a closed second floating oil cavity is formed in the protection piece and communicates with the first floating oil cavity through the gap. The elastic piece is used for providing elastic force so that the inner rod and the outer rod tend to be far away from each other in the axial direction; the flowing of the lubricating oil does not need extra power, and the acting force generated by the damping device in the damping process is partially converted into energy for pushing the lubricating oil to flow.

Description

Technical Field

[0001] The present application relates to the technical field of beach vehicles, and in particular to a shock-absorbing connection structure of a beach vehicle. Background Art

[0002] ATVs, also known as all-terrain motorcycles, are a means of transportation that can adapt to various terrains. They are widely used in daily life, especially in tourist attractions such as beaches, where they are often used as a means of transportation for tourists.

[0003] Since beach cars often need to travel on some complex and bumpy roads, a shock absorber is generally connected to the frame of the beach car for shock absorption. Generally speaking, the existing beach car shock absorber connection structure is that the suspension is hinged on the frame for connecting the wheel assembly, and the shock absorber is connected between the frame and the suspension to support the suspension and perform shock absorption. The commonly used shock absorbers of beach cars are mainly telescopic rods and springs sleeved on the outer periphery of the telescopic rods. The telescopic rod is used as a connecting component to connect the frame and is also a guide for the spring expansion and contraction. For the specific shock absorption connection structure of this beach car, please refer to the following related technologies: The shock-absorbing connection structure of a beach vehicle disclosed in publication number CN218703482U.

[0004] Publication No. CN217496314U discloses a shock absorbing structure for a beach vehicle.

[0005] Although this shock-absorbing connection structure can play a role in vehicle shock absorption, it still has defects in actual use, which are specifically reflected in: its telescopic rod generally includes two sleeve rods that are inserted into each other, and the two sleeve rods are connected by a linear bearing, so that the two can be axially relatively telescopic under the connection of the linear bearing; and in some complex road environments, such as beaches and other terrains, the beach car will raise a lot of sand and dust during driving. Once this sand and dust enters the linear bearing from the interface position of the two sleeve rods, it will affect the relative telescopic smoothness of the two sleeve rods, and it is also easy to deepen the wear of the linear bearing, which is not conducive to the service life of the bearing, so it needs to be improved.

[0006] Application Contents In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present application is to provide a shock-absorbing connection structure of a beach vehicle.

[0007] To achieve the above objectives, this application provides the following technical solutions: A shock-absorbing connection structure of a beach vehicle, characterized in that it comprises a vehicle frame, a suspension and a shock-absorbing device; the suspension is hinged to the vehicle frame, and the shock-absorbing device is arranged between the suspension and the vehicle frame, with one end of the shock-absorbing device being hinged to the suspension and the other end being hinged to the vehicle frame; The shock absorbing device comprises: Inner rod; An outer rod, wherein the outer rod has an axially extending channel inside, and the channel includes a first channel and a second channel that are axially butted; the inner rod is inserted into the first channel through a bearing, and there is a gap between the inner rod and the first channel; A piston fixed to the inner rod, which can slide in the second passage in an axial direction in a sealed manner so as to form a first floating oil chamber between the piston and the first end of the first passage; A protective member is fixed to the inner rod and is sleeved on the outer rod to slide and seal with the outer rod along the axial direction; the protective member at least partially covers the second end of the first channel and forms a closed second floating oil chamber, and the second floating oil chamber is connected to the first floating oil chamber through the gap, so that the lubricating oil can flow between the first floating oil chamber and the second floating oil chamber through the gap; An elastic member, used for providing elastic force so that the inner rod and the outer rod have a tendency to move away from each other in the axial direction; The outer end of one of the inner rod and the outer rod is hinged on the vehicle frame, and the outer end of the other is hinged on the suspension.

[0008] Compared with the prior art, the advantages of adopting this solution are: Firstly, in the present solution, a protective member is provided so that the protective member can cover the second end of the first channel, that is, to block the gap between the outer rod and the inner rod. This prevents dust from entering the gap between the outer rod and the inner rod and affecting the operation of the bearing when the beach vehicle is driving on some dusty roads (such as beaches), thereby helping to increase the service life of the bearing.

[0009] Secondly, the protective member in this scheme also forms a second floating oil chamber on the end side of the inner rod, which cooperates with the first floating oil chamber formed by the piston in the first channel, so that the lubricating oil in the two floating oil chambers can flow back and forth in the two floating oil chambers through the gap, thereby lubricating the bearings.

[0010] It is worth noting that the power to drive the lubricating oil to flow in the two floating oil chambers is provided by the shock absorber itself, and no external power is required. Specifically: When the shock absorbing device is installed on the beach vehicle, when the beach vehicle bumps, the shock absorbing device works accordingly, so that the inner rod and the outer rod reciprocate and extend relative to the axial direction. When the inner rod and the outer rod move toward each other, the second floating oil chamber is gradually compressed, and the first floating oil chamber is gradually expanded, thereby pushing the lubricating oil in the second floating oil chamber to flow to the first floating oil chamber through the gap; when the inner rod and the outer rod move away from each other, the first floating oil chamber is gradually compressed, and the second floating oil chamber is gradually expanded, so that the lubricating oil in the first floating oil chamber flows to the second floating oil chamber through the gap under the weight and the top push of the piston. This cycle is repeated, and the lubricating oil can be pushed to flow back and forth in the two floating oil chambers to lubricate the bearings.

[0011] It can be seen that in this solution, the flow of the lubricating oil does not require additional power, but the force generated by the shock absorbing device during the shock absorbing process is partially converted into energy to drive the flow of the lubricating oil.

[0012] Furthermore, it is understood that the advantages of flowing lubricating oil over stationary lubricating oil are: Firstly, the flowing lubricating oil has a certain hydraulic pressure. Under the action of hydraulic pressure, the lubricating oil can better enter some assembly gaps for lubrication, such as the gaps where bearing balls are installed in the bearings.

[0013] Furthermore, when the lubricating oil flows in the gap between the inner rod and the first channel, it has a certain flushing force, which can flush away some oil stains attached to the outer peripheral wall of the inner rod, thereby preventing the oil stains of the lubricating oil from accumulating in large quantities on the outer peripheral wall of the inner rod.

[0014] As an optional embodiment of the present application, the outer peripheral wall of the inner rod is at least partially recessed inward to form a buffer zone; in an initial state, the buffer zone is located between the first end of the first channel and the bearing.

[0015] As an optional implementation of the present application, the buffer zone surrounds the outer circumference of the inner rod to form an annular buffer zone.

[0016] As an optional implementation of the present application, a diaphragm capable of elastic deformation is fixed on the outer peripheral wall of the inner rod, and the diaphragm closes the opening side of the buffer area.

[0017] As an optional embodiment of the present application, the protective member includes a sleeve and a base plate fixed to one end of the sleeve; the sleeve is inserted into the outside of the outer rod and slidingly seals with the outer rod; the base plate is located on the opposite side of the second end of the first channel and is fixed to the inner rod to form the second floating oil chamber between the base plate and the second end of the first channel.

[0018] As an optional implementation of the present application, a sealing member is provided between the sleeve and the outer rod, and a sliding sealing fit between the sleeve and the outer rod is achieved through the sealing member.

[0019] As an optional implementation of the present application, the second channel also includes a pressure relief space; the pressure relief space is isolated from the first floating oil chamber by a piston; the pressure relief space has a pressure relief channel connected to the external environment.

[0020] As an optional implementation of the present application, the pressure relief channel is opened on the side wall of the pressure relief space, or the pressure relief channel is opened on the inner rod, one end of the pressure relief channel is connected to the pressure relief space, and the other end is connected to the external environment.

[0021] As an optional embodiment of the present application, the elastic member includes a spring; both the outer rod and the inner rod are provided with blocks, the spring is sleeved on the inner rod and the outer rod, and the two ends of the spring are respectively fixed and / or abutted with the two blocks; and / or the elastic member includes a spring, the spring is located in the second floating oil chamber and is sleeved on the inner rod, and the two ends of the spring are respectively fixed or abutted with the end of the outer rod and the end of the protective member.

[0022] As an optional embodiment of the present application, the connection between the first channel and the second channel has a step surface for lower limiting the piston. In the initial state, under the elastic force of the elastic member, the piston abuts against the step surface; and / or a limit block for upper positioning the piston is provided in the second channel.

[0023] Other advantages and effects of the present application are explained in detail in the detailed description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a schematic diagram of the structure of the shock absorbing device of this application; Figure 3 An exploded view of the shock absorbing device of this application; Figure 4 This is a schematic diagram of the structure of the protective member of the present application when it is assembled to the inner rod; Figure 5 This is a cross-sectional view of the outer rod of this application; Figure 6 This is a cross-sectional view of the shock absorbing device of the present application in an initial state; Figure 7 This is a cross-sectional view of the piston of the present application when it is in the upper limit position; Figure 8 for Figure 5 A partial schematic diagram of Fig. 9 This is a schematic diagram of the stress deformation process of the diaphragm of this application. DETAILED DESCRIPTION

[0025] The technical solutions of the embodiments of the present application are explained and described below in conjunction with the drawings of the embodiments of the present application, but the following embodiments are only preferred embodiments of the present application, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present application.

[0026] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate orientation or positional relationships are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present application.

[0027] Example 1 ATVs, also known as all-terrain vehicles, are usually equipped with shock absorbers to reduce the bumpy feeling of the vehicle in complex terrain.

[0028] Based on this, please refer to Figure 1 As shown, this embodiment provides a shock-absorbing connection structure of a beach vehicle, which mainly includes a frame M, a suspension A1 and a shock-absorbing device; wherein the frame M is the main part of the beach vehicle, one end of the suspension A1 is hinged to the frame M, and the other end is movably connected to the wheel assembly M1 of the beach vehicle; the shock-absorbing device A2 is mainly used to absorb shock for the beach vehicle, specifically, one end of the shock-absorbing device A2 is hinged to the frame M, and the other end is hinged to the suspension A1, and the suspension A1 is supported and shock-absorbed by the shock-absorbing device A2.

[0029] Combination Figure 2-9 As shown, the shock absorbing device A2 includes: an inner rod 2, an outer rod 1, a piston 4, a protective member 5, and an elastic member.

[0030] The inner rod 2 and the outer rod 1 are mutually inserted to form an axially retractable telescopic rod structure. The axial direction in this embodiment can be understood as the length direction of the entire shock absorbing device, or in other words, the axis direction of the inner rod 2 and the outer rod 1. When connected specifically, the outer end of one of the inner rod 2 and the outer rod 1 is hinged to the frame M, and the outer end of the other is hinged to the suspension A1, for example Figure 1 The illustrated case is that the outer end of the outer rod 1 is hinged to the vehicle frame M, and the outer end of the inner rod 2 is hinged to the suspension A1.

[0031] The elastic member is arranged between the inner rod 2 and the outer rod 1, and is used to provide elastic force so that the inner rod 2 and the outer rod 1 have a tendency to move away from each other along the axial direction. It can also be understood that in the initial state, that is, the shock absorber is not subjected to external force, the directions of the forces exerted by the elastic member on the inner rod 2 and the outer rod 1 are opposite to each other; in some embodiments, the elastic member can be a spring 3.

[0032] by Figure 6Taking the viewing direction as an example, the elastic member exerts an upward force on the outer rod 1 and a downward force on the inner rod 2; when the beach vehicle bumps, the inner rod 2 and the outer rod 1 overcome the elastic force of the elastic member and move axially relative to each other (i.e., the two are relatively contracted), and then when the beach vehicle is stable, the elastic member resets to push the inner rod 2 and the outer rod 1 away from each other (i.e., the two are relatively extended) to reset the shock absorbing device; this reciprocating alternating action allows the elastic member to absorb the impact force of the beach vehicle when it bumps to achieve the purpose of shock absorption.

[0033] In other words, when the beach car is traveling on a bumpy road, the shock absorbing device is actuated to achieve the purpose of shock absorption. During the shock absorption process, the inner rod 2 and the outer rod 1 reciprocate relative to each other along the axial direction, that is, the telescopic rod composed of the inner rod 2 and the outer rod 1 reciprocates, which provides power for the subsequent flow of lubricating oil in this embodiment.

[0034] like Figure 2 and Figure 3 As shown, the outer rod 1 and the inner rod 2 are provided with connecting seats at their ends away from each other, and the two connecting seats are respectively used to connect to the frame.

[0035] For the purpose of distinction, in this embodiment, the connection seat provided at the end of the outer rod 1 is recorded as the first connection seat 10 , and correspondingly, the connection seat provided at the end of the inner rod 2 is recorded as the second connection seat 20 .

[0036] In some embodiments, when the shock absorbing device is installed on the beach vehicle, Figure 1 In the state shown, the inner rod 2 is located at the lower side of the outer rod 1, that is, the first connecting seat 10 is at a higher position than the second connecting seat 20, the first connecting seat 10 is hinged to the frame M, and the second connecting seat 20 is hinged to the suspension A1.

[0037] In some other optional embodiments, the inner rod 2 may be located on the upper part of the outer rod 1. Figure 6 The view shown is rotated 180°, at which time the first connecting seat 10 is at a lower position than the second connecting seat 20; the specific selection can be made according to actual needs.

[0038] like Figure 5 As shown, the outer rod 1 has an axially extending channel inside, wherein one end of the channel away from the first connecting seat 10 is an open structure, serving as an insertion port for the inner rod 2 to be inserted into the channel.

[0039] The channel includes a first channel 11 and a second channel 12 axially butted together, that is, the channel forms a first channel 11 and a second channel 12 axially connected in sequence along the axial direction, wherein the first channel 11 is located away from the first connecting seat 10 .

[0040] like Figure 6 and Figure 7As shown, the first channel 11 mainly serves as a bearing installation area for installing a bearing 111, and the inner rod 2 is inserted into the first channel 11 through the bearing 111; wherein, the bearing 111 can be a linear bearing, and the number thereof can be one or more, preferably two bearings 111 are used, and the two bearings 111 are sequentially arranged along the axial direction of the first channel 11; the inner rod 2 is inserted into the two bearings 111 at the same time, and is jointly guided and supported by the two bearings 111.

[0041] In addition, if Figure 7 As shown, there is a gap 112 between the inner rod 2 and the first channel 11, that is, there is a certain gap 112 between the outer peripheral wall of the inner rod 2 and the peripheral wall of the first channel 11 for the lubricating oil to flow.

[0042] It is worth noting that when the inner rod 2 and the outer rod 1 are relatively extended and retracted, they are mainly supported and guided by the bearing 111. Therefore, the flexibility of the bearing 111 directly affects the smoothness of the extension and retraction of the telescopic rod. Therefore, it is sometimes necessary to add lubricating oil to the position of the bearing 111 to lubricate the bearing 111 and the inner rod 2.

[0043] Based on this, in this embodiment, Figure 7 As shown, the piston 4 is fixed to the inner rod 2, for example, the piston 4 is directly fixed to the end of the inner rod 2 away from the second connecting seat 20; in addition, the piston 4 is arranged in the second channel 12, and its radial cross-section is adapted to the radial cross-section of the second channel 12, so that the piston 4 can slide axially in the second channel 12 in a sealed manner. The sealed sliding here can be understood as that the piston 4 can slide axially in the second channel 12, and can ensure that during the sliding process, the peripheral wall of the piston 4 is always in contact with the peripheral wall of the second channel 12 to maintain sealing.

[0044] In this embodiment, the piston 4 can be made of a material with a certain degree of flexibility such as rubber or silicone, and the piston 4 can slide sealedly in the second channel 12 through the abutment and sliding between the peripheral wall of the piston 4 and the peripheral wall of the second channel 12; its matching structure is similar to the matching between the piston 4 and the syringe of a syringe.

[0045] like Figure 7 As shown, the second channel 12 is divided by the piston 4 to form two upper and lower isolated spaces. Of the two spaces, one close to the first end of the first channel 11 (also understood as close to the bearing 111 side) is the first floating oil chamber 121, and the other constitutes the pressure relief space 122.

[0046] It can also be understood that the first floating oil chamber 121 is formed between the piston 4 and the first end of the first channel 11 .

[0047] The first floating oil chamber 121 and the pressure relief space 122 are isolated from each other by the piston 4. It can be understood that the volumes of the first floating oil chamber 121 and the pressure relief space 122 are not constant, and both of them can float, mainly floating with the axial movement of the piston 4, for example. Figure 7 Taking the viewing angle shown as an example, when the piston 4 moves upward, the first floating oil chamber 121 gradually expands and the volume gradually increases. At the same time, the pressure relief space 122 gradually compresses and the volume gradually decreases. Conversely, when the piston 4 moves downward, the volume of the first floating oil chamber 121 gradually decreases, and the volume of the pressure relief space 122 gradually increases.

[0048] The protective member 5 is fixed to the inner rod 2 and is inserted into the outer rod 1 to slide and seal with the outer rod 1 along the axial direction. The sliding and sealing cooperation in this embodiment means that the protective member 5 can slide relative to the outer rod 1 along the axial direction and ensure that the cooperation position between it and the outer rod 1 is in a sealed state.

[0049] like Figure 7 As shown, the protective member 5 at least partially covers the second end of the first channel 11 and forms a closed second floating oil chamber 50 . The second end of the first channel 11 can also be understood as an end of the first channel 11 away from the second channel 12 .

[0050] In some embodiments, the second floating oil chamber 50 may be specifically formed as follows: Figure 3 and Figure 7 As shown, the protective member 5 includes a sleeve 51 and a bottom plate 52 fixed to one end of the sleeve 51; the radial cross section of the sleeve 51 is adapted to the radial cross section of the end side of the outer rod 1.

[0051] The bottom plate 52 is fixed to the end of the sleeve 51 away from the first connecting seat 10 to close the end of the bottom plate 52, that is, the bottom plate 52 is located at the opposite side of the second end of the first channel 11. The inner rod 2 is coaxially fixed and penetrated on the bottom plate 52, so that the bottom plate 52 and the inner rod 2 can move axially synchronously.

[0052] The sleeve 51 is inserted into the outer rod 1 and slides and seals with the outer rod 1. For example, Figure 8 As shown, a seal 501 is provided between the sleeve 51 and the outer rod 1, and a sliding seal is achieved between the sleeve 51 and the outer rod 1 through the seal 501, wherein the seal 501 can be a sealing ring, or a mechanical seal, etc. Taking the sealing ring as an example, it is fixedly nested in the lower end of the outer rod 1 and abuts against the inner circumferential wall of the sleeve 51.

[0053] In order to reduce the friction between the sleeve 51 and the outer rod 1 , in some embodiments, a clearance fit is formed between the inner circumferential wall of the sleeve 51 and the outer circumferential wall of the outer rod 1 .

[0054] So, like Figure 7As shown, the peripheral wall of the sleeve 51, the bottom plate 52, the inner rod 2 and the lower end of the outer rod 1 together form the second floating oil chamber 50, the second floating oil chamber 50, and the second floating oil chamber 50 is connected to the first floating oil chamber 121 through the gap 112; so that the lubricating oil can flow between the first floating oil chamber 121 and the second floating oil chamber 50 through the gap 112.

[0055] In this embodiment, the first floating oil chamber 121 and the second floating oil chamber 50 are mainly used as storage spaces for lubricating oil. For example, a certain amount of lubricating oil is injected into the second floating oil chamber 50 in advance. The specific amount of oil injected can be: in the initial state, the liquid level of the lubricating oil in the second floating oil chamber 50 is preferably at a position 1 / 2 to 3 / 4 upward from the bottom of the second floating oil chamber 50. Of course, the second floating oil chamber 50 can also be filled with the lubricating oil.

[0056] It can be understood that, in this embodiment, the volume of the second floating oil chamber 50 is not constant, but will change with the movement of the inner rod 2. Figure 6 In the state shown, the volume of the second floating oil chamber 50 is the largest; as the inner rod 2 moves upward (i.e., contracts into the outer rod 1), the protective member 5 moves upward synchronously therewith, thereby compressing the second floating oil chamber 50, so that the volume of the second floating oil chamber 50 gradually decreases. Conversely, when the inner rod 2 moves downward, the volume of the second floating oil chamber 50 gradually increases.

[0057] It can be seen that in this embodiment, the protective member 5 is equivalent to a lower piston, and the piston 4 in the second channel 12 is equivalent to an upper piston; as the beach car bumps, the inner rod 2 and the outer rod 1 will move relatively, thereby driving the protective member 5 and the piston 4 to move synchronously, for example: by Figure 6 Taking the viewing direction as an example, in the initial state, the inner rod 2 and the outer rod 1 are at the maximum relative extension length, and the volume of the second floating oil chamber 50 is the largest at this time; as the beach car bumps, the inner rod 2 moves upward relative to the outer rod 1, thereby driving the protective member 5 to move upward, and at the same time, the piston 4 also moves upward in the second channel 12 synchronously, so that the volume of the second floating oil chamber 50 gradually decreases, and the volume of the first floating oil chamber 121 gradually increases, so that an air pressure difference will gradually form between the first floating oil chamber 121 and the second floating oil chamber 50, so that the air pressure in the first floating oil chamber 121 is less than the air pressure in the second floating oil chamber 50; at the same time, the bottom plate 52 will push the lubricating oil in the first floating oil chamber 121 to move upward, and with the effect of the aforementioned air pressure difference, the lubricating oil in the first floating oil chamber 121 can flow through the gap 112 to the second floating oil chamber 50; when the lubricating oil passes through the gap 112, it can contact the bearing 111 to lubricate the bearing 111.

[0058] When the elastic force of the spring 3 drives the inner rod 2 and the outer rod 1 to return to their original positions, that is, Figure 7 As shown, the inner rod 2 moves downward relative to the outer rod 1, and the protective member 5 moves downward together with the inner rod 2. At the same time, the piston 4 also moves downward synchronously, so that the volume of the second floating oil chamber 50 gradually increases, and the volume of the first floating oil chamber 121 gradually decreases; in this way, the lubricating oil in the first floating oil chamber 121 gradually flows downward into the second floating oil chamber 50 through the gap 112 under its own weight and the downward push of the piston 4. In this process, the lubricating oil flowing through the gap 112 can contact the bearing 111 to lubricate the bearing 111.

[0059] As the inner rod 2 and the outer rod 1 perform relative axial reciprocating motions alternately, the lubricating oil can flow back and forth between the first floating oil chamber 121 and the second floating oil chamber 50 to lubricate the bearing 111 .

[0060] It can be seen that the flow of lubricating oil does not require additional power, but rather partially converts the force generated by the shock absorbing device during the shock absorbing process into kinetic energy that drives the flow of lubricating oil.

[0061] Furthermore, it is understood that the advantages of flowing lubricating oil over stationary lubricating oil are: Firstly, the flowing lubricating oil has a certain hydraulic pressure. Under the action of the hydraulic pressure, the lubricating oil can better enter some assembly gaps for lubrication, such as the gap in the bearing 111 where the ball of the bearing 111 is installed.

[0062] Furthermore, when the lubricating oil flows in the gap 112 between the inner rod 2 and the first channel 11, it has a certain flushing force, which can flush off some oil stains attached to the outer wall of the inner rod 2 and prevent the oil stains of the lubricating oil from accumulating in large quantities on the outer wall of the inner rod 2.

[0063] In this embodiment, the pressure relief space 122 has a pressure relief channel 21 connected to the external environment. The pressure relief channel 21 is provided for: The main purpose is to balance the air pressure above the piston 4 in the second channel 12 to reduce the resistance of the piston 4 when it moves upward; it can be understood as follows: like Figure 7 As shown, if there is no pressure relief channel 21, the pressure relief space 122 is equivalent to a closed space. As the piston 4 moves upward, the volume of the pressure relief space 122 gradually decreases, which will cause the air pressure in the pressure relief space 122 to gradually increase, thereby generating a greater resistance to the piston 4 and hindering the piston 4 from moving upward.

[0064] After the pressure relief channel 21 is provided, the pressure relief space 122 can be communicated with the external environment through the pressure relief channel 21, so that the air pressure in the pressure relief space 122 always tends to the external air pressure. In this way, the air pressure in the pressure relief space 122 will not be too high, and will not produce a large resistance to the piston 4.

[0065] The specific formation of the pressure relief channel 21 can be as follows: Figure 7 As shown, the pressure relief channel 21 is opened on the inner rod 2, and at least partially extends along the axial direction of the inner rod 2. One end of the pressure relief channel 21 passes through the piston 4 and is connected to the pressure relief space 122, and the other end is connected to the external environment. The end of the pressure relief channel 21 connected to the external environment is located on the outside of the protective member 5.

[0066] Such an arrangement can not only ensure that the pressure relief space 122 can communicate with the external environment, but also enable the airflow to flow through the inner rod 2 during the pressure relief process to dissipate heat to the inner rod 2 to a certain extent.

[0067] For example, when the piston 4 moves upward, the piston 4 or compresses the pressure relief space 122, so that the air flow in the pressure relief space 122 flows out to the external environment through the pressure relief channel 21; when the piston 4 moves downward, the pressure relief space 122 gradually expands and the volume becomes larger, so that the internal air pressure decreases, thereby allowing the external air flow to flow into the pressure relief space 122 through the pressure relief channel 21; this cycle is repeated, so that the external air flow and the air flow in the pressure relief space 122 can continuously flow through the pressure relief channel 21. When the air flow flows through the pressure relief channel 21, it will absorb the heat inside the inner rod 2 to achieve heat dissipation for the inner rod 2.

[0068] Of course, in some other optional implementations (not shown in the figures), a through hole may be opened on the top side wall of the pressure relief space 122 as the pressure relief channel 21 .

[0069] The specific installation of the spring 3 can be any one of the following two forms or a combination of the two.

[0070] Form 1: Stoppers 7 are fixed on the outer peripheral walls of the outer rod 1 and the inner rod 2. Figure 2 In the state shown, the spring 3 is sleeved on the inner rod 2 and the outer rod 1, and the two ends of the spring 3 are respectively fixed to the two stoppers 7, or are in contact with the two stoppers 7. In the initial state, the spring 3 is in a certain compression state.

[0071] Form 2 (not shown in the figure): the spring is located in the second floating oil chamber 50 and is sleeved on the inner rod 2, and the two ends of the spring are respectively fixed or abutted with the end of the outer rod 1 (i.e., the end of the outer rod 1 close to the bottom plate 52) and the end of the protective member 5 (i.e., the bottom plate 52); this installation form can make the spring hidden in the protective member 5.

[0072] In order to keep the inner rod 2 and the outer rod 1 in the initial state, the initial position is maintained. Figure 5As shown, the junction of the first channel 11 and the second channel 12 has a step surface 82 for lower limiting the piston 4. For example, the radial cross section of the first channel 11 is smaller than the radial cross section of the second channel 12, so as to form the step surface 82 between the two. In the initial state, as shown in FIG. Figure 6 As shown, under the elastic force of the elastic member, the piston 4 abuts against the step surface 82 to achieve the lower limit of the piston 4. The lower limit here can be understood as limiting the piston 4 from continuing to move downward from the initial position.

[0073] Similarly, in order to limit the maximum stroke of the axial relative contraction between the inner rod 2 and the outer rod 1, that is, the upper limit position of the piston 4, as shown in FIG. Figure 5 As shown, a limit block 81 is provided in the second passage 12 for upper limiting the position of the piston 4. Figure 7 As shown, when the piston 4 moves upward and contacts the limit block 81 , the piston 4 cannot continue to move upward under the restriction of the limit block 81 , so as to achieve the upper limit position.

[0074] In addition, in order to prevent dust from entering the gap between the inner circumferential wall of the sleeve 51 and the outer circumferential wall of the outer rod 1, in some embodiments, Figure 3 and Figure 7 As shown, an annular scraper 6 is provided at the top of the sleeve 51. The scraper 6 can be made of rubber material, fixed to the top of the sleeve 51, and inserted into the outer rod 1, wherein the inner ring of the scraper 6 is in conflict with the outer peripheral wall of the outer rod 1. At this time, the scraper plays a role of closing the aforementioned gap to reduce the entry of sand and dust into the aforementioned gap.

[0075] Moreover, the scraper 6 can scrape the outer peripheral wall of the outer rod 1 by axially reciprocating along with the sleeve 51, so as to scrape off some sand and dust impurities attached to the outer peripheral wall of the outer rod 1.

[0076] Example 2 In Example 1, Figure 4 As shown, the radial cross-sectional area of ​​the first floating oil chamber 121 is smaller than that of the second floating oil chamber 50, and the piston 4 and the protective member 5 move synchronously in the axial direction. Therefore, when the protective member 5 and the piston 4 are axially displaced by the same distance, the compressed volume of the second floating oil chamber 50 will be greater than the expanded volume of the first floating oil chamber 121. In this way, in the initial state, when the oil level in the second floating oil chamber 50 is relatively full, the amount of lubricating oil output by the second floating oil chamber 50 per unit time is greater than the amount of oil that the first floating oil chamber 121 can receive, which will cause a large hydraulic pressure (or oil pressure) in the two floating oil chambers, which is not conducive to the relative axial movement of the inner rod 2 and the outer rod 1. Once the oil pressure is too large, it may even cause the lubricating oil to be squeezed and leaked from the sealing position of the piston 4 into the pressure relief space 122.

[0077] Based on this, this embodiment makes further improvements on the basis of Embodiment 1: In the beach car shock absorbing device provided in this embodiment, Figure 3 As shown, the outer peripheral wall of the inner rod 2 is at least partially recessed inward to form a buffer area 22, and the radially outward side of the buffer area 22 is an open structure.

[0078] And in the initial state, if Figure 6 As shown, the buffer area 22 is located between the first end of the first channel 11 (i.e., the upper end of the first channel 11) and the bearing 111. It can be understood here that: if only one bearing 111 is used, then in the initial state, the buffer area 22 is located between the first end of the first channel 11 and the bearing 111; if multiple bearings 111 are used, then in the initial state, the buffer area 22 is located between the first end of the first channel 11 and the bearing 111 closest to the first end of the first channel 11.

[0079] The buffer area 22 is located between the first end of the first channel 11 and the bearing 111 in order to allow the lubricating oil to pass through all the bearings 111 when flowing between the two floating oil chambers, so as to lubricate the bearings 111 .

[0080] The function of the buffer area 22 is to provide a space for caching the lubricating oil and temporarily accommodating the lubricating oil. At this time, the oil storage capacity on the side where the first floating oil chamber 121 is located is equivalent to the sum of the capacity of the first floating oil chamber 121 and the capacity of the buffer area 22. For the convenience of explanation, it is recorded as a combined oil chamber. In this way, when the inner rod 2 moves axially, the amount of oil output by the first floating oil chamber 121 is basically less than or equal to the amount of oil that the combined oil chamber can receive; thereby avoiding the problem of excessive oil pressure due to the large difference between the output oil volume and the receivable oil volume of the two floating oil chambers mentioned above.

[0081] In order to increase the capacity of the buffer area 22, in some embodiments, as Figure 3 As shown, the buffer area 22 surrounds the outer circumference of the inner rod 2 to form an annular buffer area 22 , which is equivalent to the outer circumferential wall of the inner rod 2 forming a surrounding concave area to constitute the buffer area 22 .

[0082] Although the buffer area 22 is provided to buffer the oil, there are also some problems: since the gap 112 between the inner rod 2 and the first channel 11 is small, when the piston 4 moves downward, the oil buffered in the recessed area is difficult to flow out quickly and flow into the second floating oil chamber 50.

[0083] Thus, in some embodiments, Figure 4As shown, a diaphragm 23 capable of elastic deformation is fixed on the outer peripheral wall of the inner rod 2, such as a diaphragm 23 made of a rubber band material or a diaphragm 23 made of a rubber material. To adapt to the annular buffer area 22, in some embodiments, the diaphragm 23 is a sleeve-shaped structure, and the diaphragm 23 is fixedly mounted on the position of the buffer area 22 of the inner rod 2 and closes the opening side of the buffer area 22, such as Fig. 9 Status shown.

[0084] Thus, when the second floating oil chamber 50 outputs lubricating oil to the first floating oil chamber 121, the diaphragm 23 is driven to deform radially inwardly toward the inside of the recessed area (eg, Fig. 9 As shown in the figure, the recessed area can also provide space for caching lubricating oil. When the first floating oil chamber 121 outputs lubricating oil to the second floating oil chamber 20, the lubricating oil in the first floating oil chamber 121 will flow downward into the second floating oil chamber 50 under the weight and the push of the piston 4. During this process, the oil pressure at the position of the diaphragm 23 will decrease, so that the diaphragm 23 will begin to reset radially outward under its own elastic force. During the resetting process, the diaphragm 23 will bulge out the oil in the buffer area 22 to accelerate the flow of oil to the second floating oil chamber 50.

[0085] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

Claims

1. A shock-absorbing connection structure for a beach vehicle, characterized in that: It includes a frame, a suspension and a shock absorbing device; the suspension is hinged to the frame, and the shock absorbing device is arranged between the suspension and the frame, with one end of the shock absorbing device hinged to the suspension and the other end of the shock absorbing device hinged to the frame; The shock absorbing device comprises: Inner rod; An outer rod, wherein the outer rod has an axially extending channel inside, and the channel includes a first channel and a second channel that are axially butted; the inner rod is inserted into the first channel through a bearing, and there is a gap between the inner rod and the first channel; A piston fixed to the inner rod, which can slide in an axial direction in a sealed manner in the second passage so that a first floating oil chamber is formed between the piston and the first end of the first passage; A protective member is fixed to the inner rod and is sleeved on the outer rod to slide and seal with the outer rod along the axial direction; the protective member at least partially covers the second end of the first channel and forms a closed second floating oil chamber, and the second floating oil chamber is connected to the first floating oil chamber through the gap, so that the lubricating oil can flow between the first floating oil chamber and the second floating oil chamber through the gap; An elastic member, used for providing elastic force so that the inner rod and the outer rod have a tendency to move away from each other in the axial direction; The outer end of one of the inner rod and the outer rod is hinged on the vehicle frame, and the outer end of the other is hinged on the suspension.

2. The shock-absorbing connection structure of a beach vehicle according to claim 1, characterized in that: The outer peripheral wall of the inner rod is at least partially recessed inward to form a buffer zone; in an initial state, the buffer zone is located between the first end of the first channel and the bearing.

3. The shock-absorbing connection structure of a beach vehicle according to claim 1, characterized in that: The buffer zone is arranged around the outer circumference of the inner rod to form an annular buffer zone.

4. A shock-absorbing connection structure for a beach vehicle according to claim 2 or 3, characterized in that: A diaphragm capable of elastic deformation is fixed on the outer peripheral wall of the inner rod, and the diaphragm closes the opening side of the buffer area.

5. The shock-absorbing connection structure of a beach vehicle according to claim 1, characterized in that: The protective member includes a sleeve and a bottom plate fixed at one end of the sleeve; the sleeve is inserted into the outside of the outer rod and is slidingly sealed with the outer rod; the bottom plate is located on the opposite side of the second end of the first channel and is fixed to the inner rod to form the second floating oil chamber between the bottom plate and the second end of the first channel.

6. The shock-absorbing connection structure of a beach vehicle according to claim 5, characterized in that: A sealing member is provided between the sleeve and the outer rod, and a sliding sealing fit between the sleeve and the outer rod is achieved through the sealing member.

7. The shock-absorbing connection structure of a beach vehicle according to claim 1, characterized in that: The second channel also includes a pressure relief space; the pressure relief space is isolated from the first floating oil chamber by a piston; and the pressure relief space has a pressure relief channel communicating with the external environment.

8. The shock-absorbing connection structure of a beach vehicle according to claim 7, characterized in that: The pressure relief channel is opened on the side wall of the pressure relief space, or the pressure relief channel is opened on the inner rod, one end of the pressure relief channel is connected to the pressure relief space, and the other end is connected to the external environment.

9. The shock-absorbing connection structure of a beach vehicle according to claim 7, characterized in that: The elastic member includes a spring; the outer rod and the inner rod are both provided with blocks, the spring is sleeved on the inner rod and the outer rod, and the two ends of the spring are respectively fixed and / or abutted with the two blocks; and / or the elastic member includes a spring, the spring is located in the second floating oil chamber and sleeved on the inner rod, and the two ends of the spring are respectively fixed or abutted with the end of the outer rod and the end of the protective member.

10. The shock-absorbing connection structure of a beach vehicle according to claim 1, characterized in that: The junction between the first channel and the second channel has a step surface for lower limiting the piston. In the initial state, under the elastic force of the elastic member, the piston abuts against the step surface; and / or a limit block for upper limiting the piston is provided in the second channel.

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