Shock absorber

Abstract

The invention discloses a shock absorber, and belongs to the technical field of passenger car chassis suspension systems, the shock absorber comprises a sliding column, a cylinder body assembly, a piston assembly and a locking valve, the sliding column is used for being connected to a car body; the cylinder body assembly is used for being connected to a wheel and slidably arranged on the sliding column in a sleeving mode, and a sealing structure is arranged between the cylinder body assembly and the sliding column. The piston assembly is connected to the sliding column, the piston assembly is arranged in the cylinder body assembly in a sliding mode, the piston assembly and the cylinder body assembly are kept sealed, and the piston assembly is provided with an ascending channel and a descending channel; the locking valve is installed in the cylinder body assembly, the cylinder body assembly can drive the locking valve to rotate, and the locking valve can block the ascending channel. When the wheels steer, the locking valve can be driven to rotate, and then the locking valve is utilized to block an ascending channel of oil and limit the upward jumping stroke of the wheels, so that the steering space requirement of the wheels can be met under the condition of smaller radial clearance, the suspension comfort during normal driving is ensured, and the appearance is not influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of passenger vehicle chassis suspension systems, in particular to a shock absorber. Background Art

[0002] When the vehicle is moving, the wheels bounce up and down to buffer the fluctuations of uneven roads. To this end, the vehicle body or wheel guard needs to maintain a certain distance from the wheels to prevent interference during the bounce. The radial clearance required for the wheels to simply bounce up and down is relatively small.

[0003] However, the steering wheel not only bounces up and down but also steers left and right. This bouncing wheel can easily interfere with the vehicle body or wheel guard during cornering. Traditionally, this approach leaves a large radial and axial clearance between the wheels. While this prevents interference, it increases the gap between the wheel and the vehicle body or wheel guard, affecting the vehicle's appearance and reducing the appearance of non-off-road vehicles.

[0004] At the same time, to improve suspension comfort, the tire's travel is often increased, which increases the tire's radial clearance to around 100mm, affecting the appearance. Reducing the radial clearance limits the tire's travel, reducing comfort. It's difficult to achieve both comfort and radial clearance. Summary of the Invention

[0005] The purpose of the present invention is to provide a shock absorber to solve the problems existing in the above-mentioned prior art. When the wheel turns, it can drive the locking valve to rotate, and then use the locking valve to block the upward channel of the oil, thereby limiting the upward jumping stroke of the wheel, thereby meeting the turning space requirements of the wheel with a smaller radial clearance, thereby ensuring the suspension comfort during normal driving without affecting the appearance.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a shock absorber, comprising a sliding column, a cylinder assembly, a piston assembly and a locking valve, wherein the sliding column is used to be connected to a vehicle body; the cylinder assembly is used to be connected to a wheel, the cylinder assembly is slidably sleeved on the sliding column, and a sealing structure is provided between the cylinder assembly and the sliding column; the piston assembly is connected to the sliding column, the piston assembly is slidably provided inside the cylinder assembly, a seal is maintained between the piston assembly and the cylinder assembly, and the piston assembly is provided with an upward channel and a downward channel; the locking valve is installed inside the cylinder assembly, the cylinder assembly can drive the locking valve to rotate, and the locking valve can block the upward channel.

[0008] In one embodiment, a core shaft is further included, which is coaxially arranged with the sliding column. The first end of the core shaft is slidably arranged in the center hole of the sliding column, the second end of the core shaft is connected to the cylinder assembly, the locking valve is sleeved on the core shaft, and the locking valve and the core shaft are connected by a sliding key.

[0009] In one embodiment, the cylinder assembly includes an inner cylinder, an inner cylinder lower plug, an outer cylinder and an outer cylinder lower plug; the inner cylinder sliding sleeve is arranged on the outside of the sliding column, and the outer cylinder fixed sleeve is arranged on the outside of the inner cylinder, and an annular cavity is provided between the outer cylinder and the inner cylinder, and the lower space of the piston assembly in the inner cylinder is connected to the annular cavity; the inner cylinder lower plug is connected to the end of the inner cylinder, and the inner cylinder lower plug is connected to the core shaft. The inner cylinder lower plug is provided with a first hole and a second hole in the axial direction and a third hole in the radial direction, the first hole is connected in one direction upward, the second hole is connected in one direction downward, and the third hole is connected in two directions radially, and the outer cylinder lower plug is connected to the end of the outer cylinder.

[0010] In one embodiment, the sealing structure includes an inner cylinder upper plug, an outer cylinder upper plug, a sliding column upper sealing ring, a sliding column upper sealing ring frame, a sliding column upper sealing ring tightening spring and a sliding column upper sleeve, the bottom end outer diameter side of the inner cylinder upper plug is connected to the inner cylinder, the bottom end inner diameter side of the inner cylinder upper plug is connected to the sliding column through the sliding column upper sleeve, the top outer diameter side of the inner cylinder upper plug is connected to the outer cylinder, the top end of the inner cylinder upper plug is connected to the sliding column through the sliding column upper sealing ring frame, the sliding column upper sealing ring is arranged between the sliding column upper sealing ring frame and the sliding column, the sliding column upper sealing ring tightening spring is sleeved on the sliding column upper sealing ring, the outer cylinder upper plug is connected to the outer cylinder, and the outer cylinder upper plug is sleeved on the sliding column.

[0011] In one embodiment, the cylinder assembly further includes an outer cylinder low-damping plate, an outer cylinder low-damping coil spring, an outer cylinder high-damping plate and an outer cylinder high-damping spring; the outer cylinder low-damping plate is sealed at the outlet of the first hole, the first end of the outer cylinder low-damping coil spring abuts against the core shaft, and the second end of the outer cylinder low-damping coil spring abuts against the outer cylinder low-damping plate; the outer cylinder high-damping plate is sealed at the outlet of the second hole, the first end of the outer cylinder high-damping spring is connected to the core shaft, and the second end of the outer cylinder high-damping spring is connected to the outer cylinder high-damping plate.

[0012] In one embodiment, the piston assembly includes a piston body and a piston sealing ring, the piston sealing ring is connected to the outer diameter side of the piston body, the piston sealing ring is used to seal and fit with the inner wall of the inner cylinder, the upward channel includes a low-pressure damping hole axially opened in the piston body, and the downward channel includes a high-pressure damping hole axially opened in the piston body.

[0013] In one embodiment, the upward channel also includes an inner cylinder low damping plate and an inner cylinder low damping spring plate, the inner cylinder low damping plate is blocked at the outlet of the low-pressure damping hole, the first end of the inner cylinder low damping spring plate is connected to the sliding column, and the second end of the inner cylinder low damping spring plate is connected to the inner cylinder low damping plate; the downward channel also includes an inner cylinder high damping plate and an inner cylinder high damping elastic component, the inner cylinder high damping plate is blocked at the outlet of the high-pressure damping hole, and the inner cylinder high damping elastic component is used to compress the inner cylinder high damping plate.

[0014] In one embodiment, the inner cylinder high damping elastic component includes an inner cylinder high damping pressure plate, an inner cylinder high damping sealing ring, an inner cylinder high damping compression spring and an inner cylinder high damping spring compression nut, the inner cylinder high damping sealing ring is arranged between the inner cylinder high damping plate and the inner cylinder high damping pressure plate, the inner cylinder high damping spring compression nut is connected to the sliding column, the first end of the inner cylinder high damping compression spring abuts against the inner cylinder high damping pressure plate, and the second end of the inner cylinder high damping compression spring abuts against the inner cylinder high damping spring compression nut.

[0015] In one embodiment, the piston assembly also includes a piston tightening nut and an inner cylinder low damping plate limit plate, wherein the inner cylinder low damping plate limit plate is used to limit the deformation of the inner cylinder low damping plate, and the piston tightening nut is used to fix the inner cylinder low damping plate limit plate and the piston body to the sliding column.

[0016] In one embodiment, it also includes a locking valve sleeve, a locking valve sleeve retaining ring, a locking valve tightening washer, a locking valve tightening coil spring, a locking valve tightening coil spring washer and a locking valve tightening coil spring retaining ring; the locking valve is installed on the inner wall of the piston body, the locking valve sleeve is arranged between the locking valve and the piston body, and the locking valve sleeve retaining ring is installed on the inner wall of the piston body for axially limiting the locking valve sleeve; the locking valve tightening washer is located on the end face of the locking valve, the locking valve tightening coil spring retaining ring is installed on the inner wall of the piston body, the locking valve tightening coil spring washer is located on the locking valve tightening coil spring retaining ring, the first end of the locking valve tightening coil spring abuts against the locking valve tightening washer, and the second end of the locking valve tightening coil spring abuts against the locking valve tightening coil spring washer.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] When the wheel is turning, the present invention can drive the locking valve to rotate through the cylinder assembly, and then use the locking valve to block the upward channel of the piston assembly, blocking the oil from flowing upward after passing through the piston assembly, thereby limiting the upward movement of the cylinder assembly relative to the sliding column, that is, limiting the upward jumping stroke of the wheel, avoiding interference with the vehicle body or the wheel guard after the wheel jumps up, thereby meeting the steering space requirements of the wheel with a smaller radial clearance, ensuring the suspension comfort during normal driving without affecting the appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0020] Figure 1 This is an axial cross-sectional view of the shock absorber in an embodiment of the present invention;

[0021] Figure 2 This is an axial cross-sectional view of the bottom of the shock absorber in an embodiment of the present invention;

[0022] Figure 3 An axial cross-sectional view of a piston assembly in an embodiment of the present invention;

[0023] Figure 4 This is an axial cross-sectional view of the position of the sliding key of the shock absorber in an embodiment of the present invention;

[0024] Figure 5 This is an axial cross-sectional view of the shock absorber in a locked state during compression stroke according to an embodiment of the present invention;

[0025] Figure 6 This is a radial cross-sectional view of the position of the sliding key in an embodiment of the present invention;

[0026] Figure 7 This is a view of the locking valve shaft in an embodiment of the present invention;

[0027] Among them: 1. Sliding column; 2. Plug on outer cylinder; 3. Outer cylinder; 4. Plug on outer cylinder; 5. Sliding column upper seal; 6. Sliding column upper seal frame; 7. Sliding column upper seal tightening spring; 8. Plug on inner cylinder; 9. Sliding column upper bushing; 10. Bushing on core shaft; 11. Inner cylinder; 12. Core shaft; 13. Low-damping coil spring of outer cylinder; 14. Low-damping plate of outer cylinder; 15. Washer under core shaft; 16. Plug on inner cylinder; 17. High-damping plate of outer cylinder; 18. High-damping spring of outer cylinder; 19. Tightening nut under core shaft;

[0028] 101. Limit plate for inner cylinder low damping plate; 102. Spring piece for inner cylinder low damping; 103. Low damping plate for inner cylinder; 104. Piston seal; 105. Piston lower gasket; 106. High damping plate for inner cylinder; 107. High damping pressure plate for inner cylinder; 108. High damping seal for inner cylinder; 109. High damping compression spring for inner cylinder; 110. Piston tightening nut; 111. High damping spring compression nut for inner cylinder; 112. Locking valve sleeve; 113. Locking valve tightening washer; 114. Locking valve sleeve retaining ring; 115. Locking valve tightening coil spring; 116. Locking valve tightening coil spring retaining ring; 117. Locking valve tightening coil spring washer; 118. Slide key tightening spring; 119. Slide key; 121. Slide keyway;

[0029] 200, piston body; 201, low-pressure damping hole; 202, high-pressure damping hole; 300, locking valve; 301, low-pressure damping through hole; 302, locking valve lower through hole; 303, accommodating groove. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0031] The purpose of the present invention is to provide a shock absorber to solve the problems existing in the prior art. When the wheel turns, it can drive the locking valve to rotate, and then use the locking valve to block the upward channel of the oil, thereby limiting the upward jumping stroke of the wheel, thereby meeting the turning space requirements of the wheel with a smaller radial clearance, thereby ensuring the suspension comfort during normal driving without affecting the appearance.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 7As shown, the present invention provides a shock absorber comprising a spool 1, a cylinder assembly, a piston assembly, and a lock valve 300. The spool 1 is bolted to the vehicle body, while the cylinder assembly is connected to the wheel. The cylinder assembly slides over the spool 1, thereby connecting the wheel to the vehicle body and allowing the wheel to bounce up and down relative to the vehicle body, achieving a shock-absorbing effect. A sealing structure is provided between the cylinder assembly and the spool 1. This seal ensures a relative seal between the cylinder assembly and the spool 1, allowing oil to be filled into the internal space of the cylinder assembly. The piston assembly is connected to the sliding post 1 and is slidably disposed within the cylinder assembly. A seal is maintained between the piston assembly and the cylinder assembly. The piston assembly separates the upper and lower spaces of the piston assembly. The piston assembly is provided with an upward passage and a downward passage. When oil flows through the upward passage, it can reach the upper space from the lower space of the piston assembly, thereby allowing the piston assembly to move downward relative to the cylinder assembly, thereby causing the wheel to bounce upward. When oil flows through the downward passage, it can reach the lower space from the upper space of the piston assembly, thereby allowing the piston assembly to move upward relative to the cylinder assembly, thereby causing the wheel to bounce downward. A locking valve 300 is installed within the cylinder assembly. Structurally, the cylinder assembly and the locking valve 300 can be snap-fitted or fixedly connected, or provided with other connection structures, so that when the cylinder assembly rotates, it can drive the locking valve 300 to rotate, thereby causing the locking valve 300 to block the upward passage. In this case, oil cannot pass through the upward passage, thereby preventing the wheel from bouncing upward. It should be noted that when the upward channel is blocked, the downward channel can still flow oil, that is, the wheel can jump downward at this time, which does not affect the function of the wheel jumping downward.

[0034] When the wheel is turning, the present invention can drive the locking valve 300 to rotate through the cylinder assembly, and then use the locking valve 300 to block the upward channel of the piston assembly, preventing the oil from flowing upward after passing through the piston assembly, thereby limiting the upward movement of the cylinder assembly relative to the sliding column 1, that is, limiting the upward jumping stroke of the wheel, avoiding interference with the vehicle body or wheel guard after the wheel jumps, thereby meeting the steering space requirements of the wheel with a smaller radial clearance, ensuring the suspension comfort during normal driving without affecting the appearance.

[0035] With the shock absorber of the present invention, the wheels can bounce normally when the vehicle is traveling straight at high speed or making shallow turns. Due to regulations regarding wheel guards, the vehicle body or wheel guard completely covers the wheel along the tire axis, requiring only appropriate axial clearance to avoid interference, with minimal radial clearance required. When the vehicle makes a steep turn at low speed, the locking valve 300 automatically locks the shock absorber, limiting wheel bounce and preventing radial interference between the tire and the vehicle body or wheel guard.

[0036] In one embodiment, if Figures 1 to 7As shown, the assembly also includes a core shaft 12, which is coaxially arranged with the sliding post 1. The first end of the core shaft 12 is slidably mounted in the center hole of the sliding post 1 and can be provided with a core shaft sleeve 10 for sleeve connection, allowing the core shaft 12 and the sliding post 1 to slide relative to each other in the axial direction. The second end of the core shaft 12 is connected to the cylinder assembly, that is, the core shaft 12 can move up and down and rotate synchronously with the cylinder assembly. The locking valve 300 is sleeved on the core shaft 12 and connected to the core shaft 12 by a sliding key 119, that is, the core shaft 12 and the locking valve 300 cannot rotate synchronously, but can slide axially. As a result, the core shaft 12, the locking valve 300, and the cylinder assembly can move with the wheel, while the sliding post 1 and the piston assembly are fixed to the vehicle body and do not move with the wheel.

[0037] In this example, refer to Figure 6 and Figure 7 The locking valve 300 is provided with a radially oriented receiving groove 303, within which the key 119 is mounted. The core shaft 12 is provided with an axially oriented key groove 121, which extends from the receiving groove 303 into the key groove 121. This ensures that the locking valve 300 and the core shaft 12 are circumferentially locked, while remaining axially movable. A key-holding spring 118 is also provided within the receiving groove 303, which presses the key 119 against the key, ensuring that the key 119 is stably positioned within the key groove 121.

[0038] In one embodiment, if Figures 1 to 5 As shown, the cylinder assembly includes an inner cylinder 11, an inner cylinder lower plug 16, an outer cylinder 3, and an outer cylinder lower plug 4. The inner cylinder 11 is slidably mounted on the exterior of the sliding column 1, and the outer cylinder 3 is fixedly mounted on the exterior of the inner cylinder 11. An annular cavity is defined between the outer cylinder 3 and the inner cylinder 11, and the lower space of the piston assembly in the inner cylinder 11 is connected to the annular cavity. The inner cylinder lower plug 16 is rigidly connected to the end of the inner cylinder 11 and is connected to the core shaft 12. A detachable connection can be used, for example, by tightening a nut 19 under the core shaft to lock the inner cylinder lower plug 16 to the core shaft 12. The inner cylinder lower plug 16 is axially defined with a first hole and a second hole, and radially defined with a third hole. The first hole is unidirectionally connected upward, meaning that oil can only flow upward through the first hole; the second hole is unidirectionally connected downward, meaning that oil can only flow downward through the second hole; and the third hole is bidirectionally connected radially, meaning that oil can freely flow through the third hole in both directions. The outer cylinder lower plug 4 is connected to the end of the outer cylinder 3, which is a rigid connection and has sealing properties.

[0039] The dual-cylinder structure, which combines an inner cylinder 11 and an outer cylinder 3, can enhance structural strength and durability. The outer cylinder 3 acts as a protective shell to resist external impacts (such as flying rocks, mud and water, etc.), while the inner cylinder 11 focuses on bearing the internal stress of high-pressure oil and the movement of the piston assembly. This division of labor improves the overall structure's ability to resist pressure and deformation. At the same time, under complex road conditions, the shock absorber will be subjected to multi-directional forces. The dual-cylinder structure can more evenly disperse stress and prevent the single-layer cylinder body from rupturing due to local stress concentration. On the other hand, it can optimize the flow and heat dissipation of hydraulic oil. The annular cavity between the inner cylinder 11 and the outer cylinder 3 is designed as an oil flow channel to help the oil circulate quickly, reduce foaming (cavitation), and ensure damping stability. At the same time, the dual-cylinder structure increases the heat dissipation area. The outer cylinder 3 can reduce the oil temperature through air convection or the design of heat dissipation fins to avoid high temperature causing a decrease in oil viscosity or aging of seals.

[0040] In one embodiment, if Figure 1 As shown, the sealing structure includes an inner cylinder upper plug 8, an outer cylinder upper plug 2, a sliding column upper sealing ring 5, a sliding column upper sealing ring frame 6, a sliding column upper sealing ring tightening spring 7, and a sliding column upper shaft sleeve 9. The bottom outer diameter side of the inner cylinder upper plug 8 is connected to the inner cylinder 11, and the bottom inner diameter side of the inner cylinder upper plug 8 is connected to the sliding column 1 through the sliding column upper shaft sleeve 9, supporting the axial sliding of the sliding column upper shaft sleeve 9. The top outer diameter side of the inner cylinder upper plug 8 is connected to the outer cylinder 3. Sealing can be achieved by providing a sealing ring or other methods. The top end of the inner cylinder upper plug 8 is connected to the sliding column 1 through the sliding column upper sealing ring frame 6. The sliding column upper sealing ring 5 is provided between the sliding column upper sealing ring frame 6 and the sliding column 1. As a result, both the inner and outer diameter sides of the sliding column upper sealing ring frame 6 are sealed. The strut upper seal ring tightening spring 7 is mounted on the strut upper seal ring 5, tightening and securing the strut upper seal ring 5 to improve the sealing effect between the strut upper seal ring 5 and the strut 1. The outer cylinder upper plug 2 is connected to the outer cylinder 3 and is mounted on the strut 1 to support, protect, and enhance the overall structural strength of the shock absorber.

[0041] In one embodiment, if Figure 2As shown, the cylinder assembly further includes an outer cylinder low-damping plate 14, an outer cylinder low-damping coil spring 13, an outer cylinder high-damping plate 17, and an outer cylinder high-damping spring 18. The outer cylinder low-damping plate 14 blocks the outlet of the first hole. When the oil pressure is sufficient, the outer cylinder low-damping plate 14 can be pushed open to achieve conduction of the first hole. The first end of the outer cylinder low-damping coil spring 13 abuts the core shaft 12, and the second end of the outer cylinder low-damping coil spring 13 abuts the outer cylinder low-damping plate 14. The outer cylinder low-damping coil spring 13 provides a certain preload force for the outer cylinder low-damping plate 14. The outer cylinder high damping plate 17 is blocked at the outlet of the second hole. When the oil pressure is sufficient, the outer cylinder high damping plate 17 can be pushed open to achieve conduction of the second hole; the first end of the outer cylinder high damping spring piece 18 is connected to the core shaft 12, and the second end of the outer cylinder high damping spring piece 18 is connected to the outer cylinder high damping plate 17. The outer cylinder high damping spring piece 18 is used to provide a certain pre-tightening force to the outer cylinder high damping plate 17.

[0042] In one embodiment, if Figure 3 As shown, the piston assembly includes a piston body 200 and a piston seal 104. The piston seal 104 is connected to the outer diameter side of the piston body 200 and is used to seal against the inner wall of the inner cylinder 11. The upward passage includes a low-pressure damping orifice 201 axially defined in the piston body 200, and the downward passage includes a high-pressure damping orifice 202 axially defined in the piston body 200. The low-pressure damping through-hole 301 in the locking valve 300 can communicate with the low-pressure damping orifice 201 in the piston body 200, forming a complete low-damping passage during the compression stroke.

[0043] In one embodiment, if Figure 3 As shown, the upward channel also includes an inner cylinder low damping plate 103 and an inner cylinder low damping spring plate 102. The inner cylinder low damping plate 103 is blocked at the outlet of the low-pressure damping hole 201. When the oil pressure is sufficient, the inner cylinder low damping plate 103 can be pushed open to realize the conduction of the low-pressure damping hole 201. At this time, the upward channel is connected; the first end of the inner cylinder low damping spring plate 102 is connected to the sliding column 1, and the second end of the inner cylinder low damping spring plate 102 is connected to the inner cylinder low damping plate 103. The inner cylinder low damping spring plate 102 is used to provide a certain pre-tightening force for the inner cylinder low damping plate 103. The downward channel also includes an inner cylinder high damping plate 106 and an inner cylinder high damping elastic component. The inner cylinder high damping plate 106 is blocked at the outlet of the high-pressure damping hole 202. When the oil pressure is sufficient, the inner cylinder high damping plate 106 can be pushed open to realize the conduction of the high-pressure damping hole 202. At this time, the downward channel is connected; the inner cylinder high damping elastic component is used to compress the inner cylinder high damping plate 106 and provide the inner cylinder high damping plate 106 with a certain pre-tightening force.

[0044] In one embodiment, if Figure 3As shown, the inner cylinder high damping elastic component includes an inner cylinder high damping pressure plate 107, an inner cylinder high damping sealing ring 108, an inner cylinder high damping compression spring 109 and an inner cylinder high damping spring compression nut 111. The inner cylinder high damping sealing ring 108 is arranged between the inner cylinder high damping plate 106 and the inner cylinder high damping pressure plate 107 to seal and compress the inner cylinder high damping plate 106. The inner cylinder high damping spring compression nut 111 is connected to the sliding column 1. The first end of the inner cylinder high damping compression spring 109 abuts against the inner cylinder high damping pressure plate 107, and the second end of the inner cylinder high damping compression spring 109 abuts against the inner cylinder high damping spring compression nut 111. By adjusting the position of the inner cylinder high damping spring compression nut 111, the spring preload force of the inner cylinder high damping compression spring 109 can be adjusted to achieve the adjustment of the pressure of the inner cylinder high damping plate 106.

[0045] In one embodiment, if Figure 3 As shown, the piston assembly also includes a piston tightening nut 110 and an inner cylinder low damping plate limit plate 101. The inner cylinder low damping plate limit plate 101 is used to limit the deformation of the inner cylinder low damping plate 103. The piston tightening nut 110 is used to secure the inner cylinder low damping plate limit plate 101 and the piston body 200 to the spool 1. A piston lower washer 105 may also be disposed between the piston body 200 and the piston tightening nut 110 to prevent loosening, improve the tightening effect, and reduce damage to the piston body 200.

[0046] In one embodiment, if Figure 3 As shown, the locking valve 300 further includes a locking valve sleeve 112, a locking valve sleeve retaining ring 114, a locking valve pressing washer 113, a locking valve pressing coil spring 115, a locking valve pressing coil spring washer 117, and a locking valve pressing coil spring retaining ring 116. The locking valve 300 is mounted on the inner wall of the piston body 200, and the locking valve sleeve 112 is disposed between the locking valve 300 and the piston body 200 to radially support the rotation between the locking valve 300 and the piston body 200. The locking valve sleeve retaining ring 114 is mounted on the inner wall of the piston body 200 to axially limit the locking valve sleeve 112. The locking valve tightening washer 113 is located on the end face of the locking valve 300, the locking valve tightening coil spring retaining ring 116 is installed on the inner wall of the piston body 200, the locking valve tightening coil spring washer 117 is located on the locking valve tightening coil spring retaining ring 116, the first end of the locking valve tightening coil spring 115 abuts against the locking valve tightening washer 113, and the second end of the locking valve tightening coil spring 115 abuts against the locking valve tightening coil spring washer 117. The locking valve tightening coil spring 115 is used to limit the axial direction of the locking valve 300, so that the locking valve 300 can tighten the top of the piston body 200 and enable the two to rotate relative to each other.

[0047] In the embodiment of the present invention, the parts that do not rotate with the wheel include: the sliding column 1, the inner cylinder low damping plate limit plate 101, the inner cylinder low damping spring 102, the inner cylinder low damping plate 103, the piston sealing ring 104, the piston lower gasket 105, the inner cylinder high damping plate 106, the inner cylinder high damping pressure plate 107, the inner cylinder high damping sealing ring 108, the inner cylinder high damping compression spring 109, the piston tightening nut 110, the inner cylinder high damping spring compression nut 111, the locking valve sleeve 112, the locking valve sleeve retaining ring 114, the locking valve tightening coil spring 115, the locking valve tightening coil spring retaining ring 116, the locking valve tightening coil spring washer 117, and the piston body 200.

[0048] The parts that rotate with the wheel include: the upper plug of the outer cylinder 2, the outer cylinder 3, the lower plug of the outer cylinder 4, the upper sealing ring of the sliding column 5, the upper sealing ring frame of the sliding column 6, the tightening spring of the upper sealing ring of the sliding column 7, the upper plug of the inner cylinder 8, the upper sleeve of the sliding column 9, the upper sleeve of the core shaft 10, the inner cylinder 11, the core shaft 12, the low-damping coil spring of the outer cylinder 13, the low-damping plate of the outer cylinder 14, the gasket under the core shaft 15, the lower plug of the inner cylinder 16, the high-damping plate of the outer cylinder 17, the high-damping spring of the outer cylinder 18, the tightening nut under the core shaft 19, the locking valve tightening washer 113, the locking valve 300, the sliding key tightening spring 118, and the sliding key 119.

[0049] The working principle of the embodiment of the present invention is as follows:

[0050] When the wheel is not rotating, the piston body 200 and the locking valve 300 do not rotate relative to each other, the low damping channel and the high damping channel of the shock absorber compression stroke are unobstructed, the shock absorber can be compressed and deformed normally, and the wheel can bounce up and down normally.

[0051] like Figure 3 As shown, when the wheel is not turning and encounters an obstacle and bounces upward, the oil below the piston body 200 can pass through the lower through-hole 302 of the locking valve, the low-pressure damping through-hole 301, and the low-pressure damping hole 201, pushing upward the inner cylinder low-damping plate 103 and the inner cylinder low-damping spring 102, and entering the upper part of the piston body 200, thereby moving the piston body 200 and the sliding column 1 downward and completing the upward bounce of the wheel. At this time, only axial clearance is required between the wheel and the vehicle body or wheel guard, and the radial clearance between the wheel and the vehicle body or wheel guard can be hidden inside the vehicle body or wheel guard. When viewed from the outside of the vehicle, the radial clearance between the wheel and the vehicle body or wheel guard can be made relatively small.

[0052] When the wheel rotates, the piston body 200 and the locking valve 300 rotate relative to each other, closing the low-damping channel in the shock absorber's compression stroke. The shock absorber cannot be compressed, and the wheel height is locked, preventing the wheel from bouncing upward to prevent interference. However, since the high-damping channel remains unobstructed, the wheel can still bouncing downward.

[0053] like Figure 6 and Figure 7As shown, when the wheel turns, the core shaft 12 rotates with the wheel, and the core shaft 12 transmits the torque to the locking valve 300 through the sliding key groove 121 and the sliding key 119, so that the locking valve 300 rotates relative to the piston body 200.

[0054] As the steering angle increases, the distance between low-pressure damping hole 301 and low-pressure damping hole 201 gradually decreases, increasing compression damping and increasing the decompression stroke time. This increases suspension stiffness, shortens the jump stroke, and prevents radial interference between the tire and the vehicle body or wheel guard. At this point, smaller axial and radial clearances prevent interference between the wheel and the vehicle body or wheel guard.

[0055] like Figure 5 As shown, when the steering angle is large, the locking valve 300 rotates at a large angle relative to the piston body 200, blocking the low-pressure damping orifice 201. The oil below the piston cannot pass through the low-pressure damping orifice 201 to reach the top of the piston body 200. The piston body 200 and the spool 1 cannot move downward, and the shock absorber's downward travel is locked. Even if an obstacle is encountered, the wheel cannot jump upward. At this time, the smaller radial and axial clearances can prevent interference between the wheel and the vehicle body or the wheel guard.

[0056] When the direction is returned to normal, the low damping channel of the shock absorber compression stroke is reopened and the shock absorber can extend and retract normally.

[0057] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A shock absorber, characterized in that: include: A sliding column, the sliding column is used to connect to the vehicle body; A cylinder assembly, the cylinder assembly being connected to the wheel, the cylinder assembly being slidably sleeved on the sliding post, and a sealing structure being provided between the cylinder assembly and the sliding post; A piston assembly, the piston assembly is connected to the slide column, the piston assembly is slidably disposed inside the cylinder assembly, the piston assembly and the cylinder assembly are sealed, and the piston assembly is provided with an upward channel and a downward channel; and a locking valve, wherein the locking valve is installed inside the cylinder assembly, the cylinder assembly can drive the locking valve to rotate, and the locking valve can block the upward channel.

2. The shock absorber according to claim 1, characterized in that: It also includes a core shaft, which is coaxially arranged with the sliding column. The first end of the core shaft is slidably arranged in the center hole of the sliding column, the second end of the core shaft is connected to the cylinder assembly, the locking valve is sleeved on the core shaft, and the locking valve and the core shaft are connected by a sliding key.

3. The shock absorber according to claim 2, characterized in that: The cylinder assembly includes an inner cylinder, an inner cylinder lower plug, an outer cylinder and an outer cylinder lower plug; the inner cylinder sliding sleeve is arranged on the outside of the sliding column, and the outer cylinder fixed sleeve is arranged on the outside of the inner cylinder, and an annular cavity is provided between the outer cylinder and the inner cylinder, and the lower space of the piston assembly in the inner cylinder is communicated with the annular cavity; the inner cylinder lower plug is connected to the end of the inner cylinder, and the inner cylinder lower plug is connected to the core shaft. The inner cylinder lower plug is provided with a first hole and a second hole in the axial direction and a third hole in the radial direction, the first hole is connected in one direction upward, the second hole is connected in one direction downward, and the third hole is connected in two directions in the radial direction, and the outer cylinder lower plug is connected to the end of the outer cylinder.

4. The shock absorber according to claim 3, characterized in that: The sealing structure includes an inner cylinder upper plug, an outer cylinder upper plug, a sliding column upper sealing ring, a sliding column upper sealing ring frame, a sliding column upper sealing ring tightening spring and a sliding column upper sleeve, the bottom end outer diameter side of the inner cylinder upper plug is connected to the inner cylinder, the bottom end inner diameter side of the inner cylinder upper plug is connected to the sliding column through the sliding column upper sleeve, the top outer diameter side of the inner cylinder upper plug is connected to the outer cylinder, the top end of the inner cylinder upper plug is connected to the sliding column through the sliding column upper sealing ring frame, the sliding column upper sealing ring is arranged between the sliding column upper sealing ring frame and the sliding column, the sliding column upper sealing ring tightening spring is sleeved on the sliding column upper sealing ring, the outer cylinder upper plug is connected to the outer cylinder, and the outer cylinder upper plug is sleeved on the sliding column.

5. The shock absorber according to claim 3, characterized in that: The cylinder assembly also includes an outer cylinder low-damping plate, an outer cylinder low-damping coil spring, an outer cylinder high-damping plate and an outer cylinder high-damping spring; the outer cylinder low-damping plate is sealed at the outlet of the first hole, the first end of the outer cylinder low-damping coil spring abuts against the core shaft, and the second end of the outer cylinder low-damping coil spring abuts against the outer cylinder low-damping plate; the outer cylinder high-damping plate is sealed at the outlet of the second hole, the first end of the outer cylinder high-damping spring is connected to the core shaft, and the second end of the outer cylinder high-damping spring is connected to the outer cylinder high-damping plate.

6. The shock absorber according to claim 5, characterized in that: The piston assembly includes a piston body and a piston sealing ring, the piston sealing ring is connected to the outer diameter side of the piston body, the piston sealing ring is used to seal and fit with the inner wall of the inner cylinder, the upward channel includes a low-pressure damping hole axially opened in the piston body, and the downward channel includes a high-pressure damping hole axially opened in the piston body.

7. The shock absorber according to claim 6, characterized in that: The upward channel also includes an inner cylinder low damping plate and an inner cylinder low damping spring plate, the inner cylinder low damping plate is blocked at the outlet of the low-pressure damping hole, the first end of the inner cylinder low damping spring plate is connected to the sliding column, and the second end of the inner cylinder low damping spring plate is connected to the inner cylinder low damping plate; the downward channel also includes an inner cylinder high damping plate and an inner cylinder high damping elastic component, the inner cylinder high damping plate is blocked at the outlet of the high-pressure damping hole, and the inner cylinder high damping elastic component is used to compress the inner cylinder high damping plate.

8. The shock absorber according to claim 7, characterized in that: The inner cylinder high damping elastic component includes an inner cylinder high damping pressure plate, an inner cylinder high damping sealing ring, an inner cylinder high damping compression spring and an inner cylinder high damping spring compression nut. The inner cylinder high damping sealing ring is arranged between the inner cylinder high damping plate and the inner cylinder high damping pressure plate. The inner cylinder high damping spring compression nut is connected to the sliding column. The first end of the inner cylinder high damping compression spring abuts against the inner cylinder high damping pressure plate, and the second end of the inner cylinder high damping compression spring abuts against the inner cylinder high damping spring compression nut.

9. The shock absorber according to claim 7, characterized in that: The piston assembly also includes a piston tightening nut and an inner cylinder low damping plate limit plate, wherein the inner cylinder low damping plate limit plate is used to limit the deformation of the inner cylinder low damping plate, and the piston tightening nut is used to fix the inner cylinder low damping plate limit plate and the piston body to the sliding column.

10. The shock absorber according to claim 6, characterized in that: The cam is secured to the cam face and is adapted to engage the cam face of the piston, wherein the cam face is secured to the cam face and is adapted to engage the cam face of the piston.

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