A buffer structure for front fork of electric vehicle

Abstract

The present invention discloses a buffer structure for a front fork of an electric vehicle, belonging to the technical field of shock absorbers, comprising an outer tube, in which an oil storage chamber is arranged; an inner tube, which is slidably plugged on the outer tube; and a damping assembly, in which the damping assembly is arranged at one end of the inner tube located inside the outer tube, and the damping assembly comprises a plurality of pistons slidably mounted in the oil storage chamber, the plurality of pistons divide the oil storage chamber into a plurality of chambers, and a damping unit is arranged in the chamber between two adjacent pistons. The present invention is provided with a damping assembly, and when the inner tube reciprocates on the outer tube, the hydraulic oil in the outer tube will pass through the first through hole and the flow regulating member on the connecting tube, and when the inner tube is pressurized, the damping assembly moves downward, and the inner spring gradually presses against the piston, which reduces the fluid passing capacity of the flow regulating member, thereby gradually increasing the resistance of the hydraulic oil when passing through the damping assembly, consuming vibration energy, and achieving a vibration reduction effect.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorbers, and in particular to a front fork buffer structure of an electric vehicle. Background Art

[0002] With the rapid development of the electric vehicle industry, the performance and comfort of electric vehicles as an environmentally friendly and convenient means of transportation have become an important focus of consumers. Among them, the front fork of an electric vehicle is a key component connecting the wheels and the body of the vehicle, and its buffering performance is directly related to the stability and comfort during riding. The buffer structure of the front fork of modern electric vehicles has begun to adopt a more complex hydraulic damping system, which achieves a more precise and efficient shock absorption effect through the flow of oil and the generation of damping force. However, the existing front fork buffer structure of electric vehicles still has some shortcomings in design and implementation. For example, when facing complex and changeable riding roads, its vibration reduction effect is limited, and it is difficult to flexibly adjust according to the actual needs of the rider, and it cannot meet the personalized needs of different riders. Summary of the invention

[0003] In view of the above-mentioned technical deficiencies, an object of the present invention is to provide a front fork buffer structure of an electric vehicle, which can better reduce vibration by providing a damping component.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a front fork buffer structure of an electric vehicle, comprising:

[0006] An outer tube, the outer tube is used to connect the rotating shaft of the tire, and an oil storage cavity is arranged in the outer tube;

[0007] An inner tube, the inner tube is slidably plugged into the outer tube, and an end cap is provided at one end of the inner tube away from the outer tube;

[0008] A sealing cover, which is arranged at the end of the outer tube and is used to seal the gap between the outer tube and the inner tube;

[0009] A damping assembly, wherein the damping assembly is arranged at one end of the inner tube located inside the outer tube, the damping assembly comprises a plurality of pistons slidably mounted in the oil storage cavity, the plurality of pistons divide the oil storage cavity into a plurality of chambers, a damping unit is arranged in the chamber between two adjacent pistons, the damping unit comprises a connecting pipe and a flow regulating member sleeved on the connecting pipe, the two ends of the connecting pipe are respectively slidably mounted on two adjacent pistons, a first through hole is opened on the side wall of the connecting pipe, and the inner chambers of adjacent connecting pipes are connected;

[0010] An inner spring, which is disposed in the outer tube and abuts against the piston at the lower end;

[0011] An outer spring, wherein the outer spring is sleeved on the inner tube between the end cover and the sealing cover;

[0012] Among them, the oil storage chamber below the damping assembly is connected to all connecting pipes, the first through hole opened on the side wall of the connecting pipe is connected to the chamber through a flow regulating member, all chambers are connected, and the uppermost chamber is connected to the oil storage chamber above the damping assembly.

[0013] Preferably, the piston located at the top is the upper piston, the piston located at the bottom is the lower piston, the piston located between the upper piston and the lower piston is the middle piston, the middle piston is provided with a second through hole for connecting the upper and lower chambers, the upper piston is provided with a third through hole for connecting the upper oil storage chamber and the lower chamber, the lower piston and the middle piston are provided with a fourth through hole, and the connecting pipe sliding seal is installed on the fourth through hole.

[0014] Preferably, an adjusting rod is rotatably installed in the inner tube, a blind hole is provided at one end of the adjusting rod close to the damping assembly, a locking rod is threadedly installed in the blind hole, the locking rod passes through all the pistons, a key slot is provided on the inner tube, a limit key cooperating with the key slot is provided on the locking rod, and a splint is fixed to one end of the locking rod extending below the bottommost piston.

[0015] Preferably, the locking rod passes through the upper piston, the connecting pipe and the fourth through hole, and a sealing ring is provided between the locking rod and the upper piston.

[0016] Preferably, the upper piston, the middle piston and the lower piston are all provided with bosses for restricting the sliding position of the connecting pipe.

[0017] Preferably, the flow regulating member comprises:

[0018] Two elastic members, each of which is in a disc shape and has a fifth through hole in the middle, wherein the outer circles of the two elastic members are against each other and the inner circles are away from each other; the connecting pipe passes through the fifth through hole, the first through hole is between the inner circles of the two elastic members, and the diameter of the inner circle is larger than the outer diameter of the connecting pipe;

[0019] The damping sleeve is sleeved on the outer rings of the two elastic members, and a plurality of oil passage grooves are provided on one side of the damping sleeve close to the inner wall of the outer tube.

[0020] Preferably, the flow regulating member further comprises two limiting rings, the two limiting rings respectively abut against surfaces of the two elastic members which are away from each other, and a plurality of sixth through holes are formed on the limiting rings.

[0021] Preferably, the inner tube is located inside the outer tube and an overflow hole is opened on the side wall above the damping assembly, and an overflow cavity is arranged in the inner tube.

[0022] The beneficial effects of the present invention are:

[0023] The present invention is provided with a damping assembly. When the inner tube reciprocates on the outer tube, the hydraulic oil in the outer tube passes through the first through hole and the flow regulating member on the connecting tube. When the inner tube is pressurized, the damping assembly moves downward, and the inner spring gradually presses the piston, which reduces the fluid passing capacity of the flow regulating member, thereby gradually increasing the resistance of the hydraulic oil passing through the damping assembly, consuming vibration energy, and achieving a vibration reduction effect. When the flow regulating member provided in the present invention is pressurized, the two elastic members can press against the damping sleeve, so that the damping sleeve presses against the inner wall of the outer tube, thereby further increasing the mechanical friction and better consuming vibration energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A three-dimensional diagram of the overall structure of a front fork buffer structure of an electric vehicle provided by an embodiment of the present invention.

[0026] Figure 2 It is a top view of the overall structure of the present invention.

[0027] Figure 3 for Figure 2 Cross-sectional view at AA in the middle.

[0028] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0029] Figure 5 for Figure 3 A partial enlarged view of point B in the middle.

[0030] Figure 6 for Figure 5 A partial enlarged view of point C in the middle.

[0031] Figure 7 It is a three-dimensional diagram of the damping assembly of the present invention.

[0032] Figure 8 It is a three-dimensional diagram of the flow regulating member of the present invention.

[0033] Description of reference numerals:

[0034] 1. outer tube, 2. oil storage chamber, 3. inner tube, 4. end cover, 5. sealing cover, 6. chamber, 7. connecting pipe, 8. flow regulating member, 9. first through hole, 10. inner spring, 11. outer spring, 12. upper piston, 13. middle piston, 14. lower piston, 15. second through hole, 16. third through hole, 17. fourth through hole, 18. adjusting rod, 19. blind hole, 20. locking rod, 21. keyway, 22. limit key, 23. splint, 24. sealing ring, 25. boss, 26. elastic member, 27. fifth through hole, 28. inner ring, 29. outer ring, 30. damping sleeve, 31. oil groove, 32. limit ring, 33. sixth through hole, 34. overflow hole, 35. overflow chamber. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1:

[0037] like Figures 1 to 8 As shown, embodiment 1 of the present invention provides a buffer structure for the front fork of an electric vehicle, including two buffer components, each buffer component includes an outer tube 1, an inner tube 3, a sealing cover 5, a damping assembly, an inner spring 10 and an outer spring 11, wherein the two outer tubes 1 are fixedly connected by a bridge frame, and top covers are provided on the tops of the two inner tubes 3, and the two top covers are fixedly connected by a steering seat.

[0038] When in use, the bottom of the outer tube 1 is mounted on the rotating shaft of the tire. The outer tube 1 contains an oil storage chamber 2 for storing hydraulic oil. A sealing cover 5 is mounted on the top of the outer tube 1, and the inner tube 3 and the sealing cover 5 are slidably sealed. The lower end of the inner tube 3 is inserted into the oil storage chamber 2. A sealing ring 24 is provided on the sealing cover 5 to prevent the hydraulic oil in the oil storage chamber 2 from overflowing from the gap between the outer tube 1 and the inner tube 3. The damping assembly is arranged at the end of the inner tube 3 inserted into the outer tube 1. The outer spring 11 is sleeved on the inner tube 3 between the end cover 4 and the sealing cover 5, and the outer spring 11 plays a supporting role. When the vehicle is bumpy during driving, the inner tube 3 is affected by the frame, compressing the outer spring 11 and moving toward the outer tube 1, and then the outer spring 11 is reset to push the inner tube 3 upward. In this process, the damping assembly rises and falls in the outer tube 1 as the inner tube 3 moves, and acts with the hydraulic oil in the oil storage chamber 2 to produce a damping effect and absorb vibration energy.

[0039] like Figures 5 to 8As shown, the damping assembly of the present invention includes four pistons slidably mounted in the oil storage chamber 2. For the sake of distinction, the piston located at the top is called the upper piston 12, the piston located at the bottom is called the lower piston 14, and the two pistons located in the middle are called the intermediate pistons 13. The four pistons separate the oil storage chamber 2 into three chambers 6. The upper piston 12 and the intermediate piston 13 form a chamber 6, the two intermediate pistons 13 form a chamber 6, and the lower piston 14 and the intermediate piston 13 form a chamber 6. The three chambers 6 are all provided with damping units.

[0040] like Figure 5 As shown, the lower piston 14 and the middle piston 13 are both provided with a fourth through hole 17, while the upper piston 12 is provided with a circular groove facing the middle piston 13. The damping unit includes a connecting pipe 7 and a flow regulating member 8 sleeved on the connecting pipe 7. The two ends of the connecting pipe 7 between the upper piston 12 and the middle piston 13 are respectively installed in the circular groove and the fourth through hole 17 in a sliding and sealing manner. The two ends of the remaining two connecting pipes 7 are installed in the adjacent fourth through holes 17 in a sliding and sealing manner. The fourth through hole 17 and the circular groove are both provided with a boss 25 for constraining the sliding position of the connecting pipe 7. The side wall of the connecting pipe 7 is provided with a first through hole 9, and the inner cavities of the adjacent connecting pipes 7 are connected through the fourth through hole 17. In this way, when the damping assembly moves downward, the hydraulic oil below will enter all the connecting pipes 7 above from the fourth through hole 17 of the lower piston 14, and enter the chamber 6 through the first through hole 9 in the connecting pipe 7. The middle piston 13 is provided with a second through hole 15 for connecting the upper and lower chambers 6, and the upper piston 12 is provided with a third through hole 16 for connecting the upper oil storage chamber 2 with the lower chamber 6. In this way, the hydraulic oil entering the chamber 6 from the first through hole 9 can be connected to the upper oil storage chamber 2 through the second through hole 15 and the third through hole 16. The inner spring 10 is arranged below the damping assembly in the outer tube 1, and the upper end of the inner spring 10 abuts against the lower surface of the lower piston 14.

[0041] Through the above arrangement, when the inner tube 3 moves on the outer tube 1, the damping assembly will react with the hydraulic oil in the oil storage chamber 2. When the hydraulic oil flows through the damping assembly from above or below the damping assembly, it is affected by the flow limiting effect of the first through hole 9, thereby realizing the damping buffering effect.

[0042] Embodiment 2:

[0043] Based on the first embodiment, Figures 5 to 8As shown, the flow regulating member 8 designed in the present invention includes two elastic members 26 in the shape of circular discs, and a fifth through hole 27 is opened in the middle of the elastic members 26. The elastic members 26 can adopt existing disc springs. The outer rings 29 of the two elastic members 26 are in contact, while the inner rings 28 are away from each other. The connecting pipe 7 passes through the fifth through hole 27, and the first through hole 9 is located between the inner rings 28 of the two elastic members 26. At the same time, the diameter of the inner ring 28 is larger than the outer diameter of the connecting pipe 7, so that the hydraulic oil flowing from the first through hole 9 in the connecting pipe 7 to the space between the two elastic members 26 can flow into the chamber 6 from the gap between the inner ring 28 and the outer wall of the connecting pipe 7.

[0044] In order to more stably maintain the positional relationship of the two elastic members 26, as shown in FIG. Figure 8 As shown, a damping sleeve 30 is sleeved on the outer ring 29 of the two elastic members 26, and a groove is provided on the side of the damping sleeve 30 facing the elastic member 26, and the outer ring 29 of the elastic member 26 is against the groove. A plurality of oil passage grooves 31 are provided on the side of the damping sleeve 30 close to the inner wall of the outer tube 1. When the inner tube 3 moves downward, the damping assembly gradually presses against the inner spring 10, which causes the elastic member 26 to be deformed under pressure. When the circular disc-shaped elastic member 26 is deformed under pressure, the diameter of the outer ring 29 will increase, while the diameter of the inner ring 28 will decrease. Therefore, the gap between the inner ring 28 and the outer wall of the connecting tube 7 will be further reduced, which will increase the resistance of the hydraulic oil when passing through, thereby increasing the damping. At the same time, the damping sleeve 30 can be spliced ​​by two half sleeves. When the diameter of the outer ring 29 increases, the two half sleeves will be stretched apart, so that the damping sleeve 30 presses against the inner wall of the outer tube 1, further increasing the damping force of mechanical friction and consuming the energy of vibration.

[0045] Considering that when the inner ring 28 of the elastic member 26 directly abuts against the piston surface, the passing capacity of the hydraulic oil may be greatly reduced. Therefore, a limit ring 32 is provided on the surfaces of the two elastic members 26 that are away from each other, the elastic member 26 abuts against the limit ring 32, the limit ring 32 abuts against the piston, and a plurality of sixth through holes 33 are provided on the limit ring 32. In this way, the hydraulic oil passing through the gap between the inner ring 28 of the elastic member 26 and the outer wall of the connecting pipe 7 can enter the chamber 6 through the sixth through holes 33.

[0046] like Figure 4 As shown, considering that the space of the liquid storage chamber will be reduced when the inner tube 3 moves into the outer tube 1, in order to allow the hydraulic oil to flow, an overflow hole 34 is opened on the side wall of the inner tube 3 located inside the outer tube 1 and above the damping assembly, and an overflow chamber 35 is provided in the inner tube 3. In this way, the hydraulic oil squeezed out of the liquid storage chamber due to the movement of the inner tube 3 into the outer tube 1 can enter the overflow chamber 35 from the overflow hole 34 to avoid jamming.

[0047] Embodiment three:

[0048] On the basis of the first and second embodiments, in order to allow the user to actively adjust the size of the damping. The present invention has an adjusting rod 18 rotatably installed in the inner tube 3, and one end of the adjusting rod 18 extends from the top of the inner tube 3 through the end cover 4. A blind hole 19 is provided at one end of the adjusting rod 18 close to the damping assembly, and a locking rod 20 is threadedly installed in the blind hole 19. A key slot 21 is provided on the inner tube 3, and a limit key 22 that cooperates with the key slot 21 is provided on the locking rod 20. When the top of the adjusting rod 18 is rotated, the adjusting rod 18 rotates. Since the locking rod 20 is restricted from rotating by the limit key 22 and the key slot 21, the locking rod 20 moves up and down in the inner tube 3 under the action of the thread.

[0049] like Figure 3 and Figure 5 As shown, the locking rod 20 passes through all the pistons, and the bottom of the locking rod 20 extends to below the lower piston 14 and is fixed with a clamping plate 23, which is also provided with a through hole to prevent the clamping plate 23 from affecting the hydraulic oil from entering and exiting the fourth through hole 17.

[0050] Since the locking rod 20 passes through the upper piston 12 , the connecting pipe 7 and the fourth through hole 17 , a sealing ring 24 is provided between the locking rod 20 and the upper piston 12 to prevent the hydraulic oil from flowing through the gap between the locking rod 20 and the upper piston 12 .

[0051] After the above settings, the user can adjust the height of the clamp 23 by turning the adjustment rod 18, so that the clamp 23 cooperates with the inner tube 3 to clamp the piston, thereby compressing the elastic member 26, which plays a role in adjusting the size of the gap between the inner ring 28 of the elastic member 26 and the outer wall of the connecting tube 7, adjusting the hydraulic oil passing capacity, and then adjusting the damping size.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A front fork buffer structure of an electric vehicle, characterized in that: include: An outer tube (1), the outer tube (1) being used to connect to the rotating shaft of the tire, and an oil storage chamber (2) being provided inside the outer tube (1); An inner tube (3), the inner tube (3) being slidably plugged into the outer tube (1), and an end cap (4) being provided at one end of the inner tube (3) away from the outer tube (1); A sealing cover (5), the sealing cover (5) being arranged at the end of the outer tube (1) and used for sealing the gap between the outer tube (1) and the inner tube (3); A damping assembly, the damping assembly being arranged at one end of the inner tube (3) located inside the outer tube (1), the damping assembly comprising a plurality of pistons slidably mounted in an oil storage chamber (2), the plurality of pistons dividing the oil storage chamber (2) into a plurality of chambers (6), a damping unit being arranged in a chamber (6) between two adjacent pistons, the damping unit comprising a connecting pipe (7) and a flow regulating member (8) sleeved on the connecting pipe (7), the two ends of the connecting pipe (7) being slidably mounted on two adjacent pistons respectively, a first through hole (9) being provided on a side wall of the connecting pipe (7), and the inner chambers of adjacent connecting pipes (7) being connected; An inner spring (10), the inner spring (10) being arranged in the outer tube (1) and resting against the piston at the lower end; An outer spring (11), wherein the outer spring (11) is sleeved on the inner tube (3) between the end cover (4) and the sealing cover (5); The oil storage chamber (2) below the damping assembly is in communication with all the connecting pipes (7), a first through hole (9) provided on the side wall of the connecting pipe (7) is in communication with the chamber (6) via a flow regulating member (8), all the chambers (6) are in communication, and the uppermost chamber (6) is in communication with the oil storage chamber (2) above the damping assembly; The flow regulating member (8) comprises: Two elastic members (26), each of which is in the shape of a circular disc and has a fifth through hole (27) in the middle, the outer rings (29) of the two elastic members (26) abut against each other, and the inner rings (28) are spaced apart from each other; the connecting tube (7) passes through the fifth through hole (27), the first through hole (9) is located between the inner rings (28) of the two elastic members (26), and the diameter of the inner ring (28) is larger than the outer diameter of the connecting tube (7); a damping sleeve (30), the damping sleeve (30) being sleeved on the outer rings (29) of the two elastic members (26); a plurality of oil passage grooves (31) being provided on a side of the damping sleeve (30) close to the inner wall of the outer tube (1); the damping sleeve (30) being formed by splicing two half sleeves; when the diameter of the outer ring (29) increases, the two half sleeves are spread apart and pressed against the inner wall of the outer tube (1); The flow regulating member (8) further comprises two limiting rings (32), the two limiting rings (32) respectively abutting against mutually diverging surfaces of the two elastic members (26), and a plurality of sixth through holes (33) are formed on the limiting rings (32).

2. The electric vehicle front fork buffer structure according to claim 1, characterized in that: The piston at the top is an upper piston (12), the piston at the bottom is a lower piston (14), the piston between the upper piston (12) and the lower piston (14) is an intermediate piston (13), the intermediate piston (13) is provided with a second through hole (15) for connecting the upper and lower chambers (6), the upper piston (12) is provided with a third through hole (16) for connecting the upper oil storage chamber (2) and the lower chamber (6), the lower piston (14) and the intermediate piston (13) are provided with a fourth through hole (17), and the connecting pipe (7) is slidably and sealably mounted on the fourth through hole (17).

3. The electric vehicle front fork buffer structure as claimed in claim 2, characterized in that: An adjusting rod (18) is rotatably mounted in the inner tube (3); a blind hole (19) is provided at one end of the adjusting rod (18) close to the damping assembly; a locking rod (20) is threadedly mounted in the blind hole (19); the locking rod (20) passes through all the pistons; a keyway (21) is provided on the inner tube (3); a limit key (22) cooperating with the keyway (21) is provided on the locking rod (20); and a clamping plate (23) is fixed to one end of the locking rod (20) extending below the piston of the lowest layer.

4. The electric vehicle front fork buffer structure as claimed in claim 3, characterized in that: The locking rod (20) passes through the upper piston (12), the connecting pipe (7) and the fourth through hole (17), and a sealing ring (24) is provided between the locking rod (20) and the upper piston (12).

5. The electric vehicle front fork buffer structure as claimed in claim 2, characterized in that: The upper piston (12), the middle piston (13) and the lower piston (14) are all provided with bosses (25) for restricting the sliding position of the connecting pipe (7).

6. The electric vehicle front fork buffer structure according to claim 1, characterized in that: The inner tube (3) is located inside the outer tube (1) and has an overflow hole (34) on its side wall located above the damping assembly, and an overflow chamber (35) is provided in the inner tube (3).

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