A shock absorber piston valve limiting protection structure

Abstract

The application discloses a shock absorber piston valve limiting protection structure and relates to the technical field of shock absorber piston valves, which comprises a piston shaft, a piston is sleeved on the outer wall of the piston shaft, a rubber ring is sleeved on the outer wall of the piston, and four oil channel input ends and four oil channel output ends are arranged in the piston. The upper limiting gasket and the lower limiting gasket are arranged, the upper limiting gasket supports the deformation of the compression valve piece with a large outer diameter in the compression stroke, the durability of the compression valve piece is improved, the problem that the performance is excessively attenuated due to the deformation of the compression valve piece after durability is solved, the lower limiting gasket supports the deformation of the recovery valve piece with a large outer diameter in the recovery stroke, the durability of the recovery valve piece is improved, and the problem that the performance is excessively attenuated due to the deformation of the recovery valve piece after durability is solved.

Description

Technical Field

[0001] This invention relates to the field of vibration damper piston valve technology, specifically a vibration damper piston valve limit protection structure. Background Technology

[0002] When the chassis and axle reciprocate relative to each other, and the piston in the shock absorber also reciprocates within the cylinder, the oil in the shock absorber housing repeatedly flows from one inner cavity to another through narrow orifices. At this time, the friction between the orifice wall and the oil, as well as the friction within the liquid molecules, generates a damping force against the vibration, causing the vibration energy of the chassis and frame to be converted into heat energy, which is absorbed by the oil and the shock absorber housing and then dissipated into the atmosphere. The magnitude of the damping force of the shock absorber increases or decreases with the relative speed between the chassis and axle (or wheels) and is related to the viscosity of the oil. It is required that the viscosity of the oil used in the shock absorber be as small as possible to be affected by temperature changes; and that it have properties such as resistance to vaporization, resistance to oxidation, and non-corrosiveness to various metal and non-metal parts.

[0003] In existing shock absorber piston valve systems, the compression valve plate and the recovery valve plate undergo frequent deformation during long-term use, resulting in a significant decrease in damping performance and a short service life for the compression valve plate and the recovery valve plate. Summary of the Invention

[0004] The purpose of this invention is to provide a piston valve limit protection structure for a shock absorber in order to solve the problems of low service life and significant performance degradation of compression valve plates and recovery valve plates.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a piston valve limiting protection structure for a shock absorber, comprising a piston shaft, a piston sleeved on the outer wall of the piston shaft, a rubber ring sleeved on the outer wall of the piston, four oil passage inlet ends and four oil passage outlet ends inside the piston, the oil passage inlet ends and the oil passage outlet ends being arranged alternately in a ring along the interior of the piston, the top end of the oil passage inlet end being embedded in a groove inside the piston, the bottom end of the piston being embedded in a recess, a compression valve plate sleeved on the outer wall of the piston shaft at the top end of the piston, multiple compression valve plates stacked along the outer wall of the piston shaft, an upper limit gasket sleeved on the outer wall of the piston shaft at the top end of the compression valve plate, and an upper limit gasket sleeved on the outer wall of the piston shaft at the top end of the upper limit gasket. The second support pad includes a second support pad, wherein a recovery valve plate is sleeved on the outer wall of the piston shaft at the bottom end of the piston, multiple recovery valve plates are stacked along the outer wall of the piston shaft, a lower limit gasket is sleeved on the outer wall of the piston shaft at the bottom end of the recovery valve plate, a first support pad is sleeved on the outer wall of the piston shaft at the bottom end of the lower limit gasket, and a nut is sleeved on the outer wall of the piston shaft at the bottom end of the first support pad; wherein the second support pad includes a floating plate; four guide posts equidistantly arranged around the outer edge of the lower surface of the floating plate; a pressure plate located directly below the floating plate and fixedly connected to the bottom ends of the four guide posts; a pad body slidably installed along the length of the guide posts on the outer wall of the four guide posts; and springs respectively sleeved on the outer wall of the four guide posts and located between the pad body and the pressure plate.

[0006] As a further embodiment of the present invention: the oil passage output end has a 7-shaped structure, the piston has a stepped structure, the bottom end of the oil passage output end extends to the bottom end of the piston, and the top end of the oil passage output end extends to the upper outer wall of the piston.

[0007] As a further embodiment of the present invention: a blocking ring is provided at the top of the inner part of the recess, and the blocking ring and the piston are integrally cast.

[0008] As a further embodiment of the present invention: the lower outer wall of the piston is provided with an annular groove, and multiple annular grooves are provided. The inner wall of the rubber ring is provided with an annular protrusion that matches the annular groove. The rubber ring is fixed to the lower outer wall of the piston by the cooperation of the annular groove and the annular protrusion.

[0009] As a further embodiment of the present invention: the top end of the second support pad is in contact with the bottom end of the upper outer wall of the piston shaft, and the outer diameter of the upper limit pad is larger than the outer diameter of the uppermost compression valve plate.

[0010] As a further embodiment of the present invention: the outer diameter of the lower limiting gasket is larger than the outer diameter of the bottommost restoring valve piece, and the outer diameter of the first restoring valve piece below the blocking ring is larger than the outer diameter of the blocking ring.

[0011] As a further embodiment of the present invention: the outer wall of the piston shaft is provided with a threaded groove located below the piston, and the threaded groove matches the inner wall of the nut.

[0012] As a further embodiment of the present invention: the top of the piston is embedded in the outer wall of the groove with a connecting groove, the connecting groove having an annular structure, and the outer diameter of the first layer of compression valve plate above the piston matches the upper outer diameter of the piston.

[0013] As a further aspect of the present invention, a sealing ring is provided on the inner wall of the piston.

[0014] As a further embodiment of the present invention: the pressing plate, the floating plate, and the pad are all annular metal sheets, the inner diameter of the pressing plate is larger than the outer diameter of the upper limit pad, the inner diameter of the floating plate is larger than the maximum outer diameter of the piston shaft, and the inner diameter of the pad matches the minimum outer diameter of the piston shaft.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. By setting upper and lower limit shims, during the compression stroke, the upper limit shim provides deformation support for the compression valve plate with a larger outer diameter, thereby improving the durability of the compression valve plate and solving the problem of excessive performance degradation caused by deformation after the compression valve plate has been worn out. During the rebound stroke, the lower limit shim provides deformation support for the recovery valve plate with a larger outer diameter, thereby improving the durability of the recovery valve plate and solving the problem of excessive performance degradation caused by deformation after the recovery valve plate has been worn out.

[0017] 2. The second support pad elastically presses against the outer edge of the compression valve plate. When the oil passage output end needs to be closed, the hydraulic oil in the shock absorber pushes the floating plate, which in turn moves down and pushes the pressure plate to squeeze the outer edge of the compression valve plate. This can improve the sealing performance between the compression valve plate and the piston oil passage output end, and at the same time, it can also correct the deformed outer edge of the compression valve plate, assisting the compression valve plate to fit with the piston oil passage output end and improve the sealing performance. Conversely, when the oil passage output end needs to discharge oil, the outer edge of the compression valve plate is deformed by the oil pressure and pushes the pressure plate up, at which time the oil passage output end is opened. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded structural view of the present invention; Figure 3 This is a schematic cross-sectional view of the structure of the present invention; Figure 4This is a cross-sectional view of the piston structure of the present invention; Figure 5 This is a schematic view of the second support pad structure of the present invention; Figure 6 This is an exploded view of the second support pad of the present invention; Figure 7 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 8 For the present invention Figure 3 Enlarged diagram of point B in the middle.

[0019] In the diagram: 1. Piston shaft; 2. Piston; 3. Rubber ring; 4. Oil passage inlet; 5. Oil passage outlet; 6. Groove; 7. Recess; 8. Blocking ring; 9. Restoration valve plate; 10. Lower limit gasket; 11. First support pad; 12. Nut; 13. Compression valve plate; 14. Upper limit gasket; 15. Second support pad; 151. Floating plate; 152. Pad body; 153. Guide post; 154. Pressure plate; 155. Spring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 8In this embodiment of the invention, a piston valve limiting protection structure for a shock absorber includes a piston shaft 1, a piston 2 sleeved on the outer wall of the piston shaft 1, a rubber ring 3 sleeved on the outer wall of the piston 2, four oil inlet ends 4 and four oil outlet ends 5 opened inside the piston 2, the oil inlet ends 4 and the oil outlet ends 5 are arranged alternately in a ring shape along the inside of the piston 2, the top end of the oil inlet end 4 is located inside the piston 2 and has a groove 6 embedded therein, the bottom end of the piston 2 has a recess 7 embedded therein, and the outer wall of the piston shaft 1... A compression valve plate 13 is fitted onto the top of piston 2. Multiple compression valve plates 13 are stacked along the outer wall of piston shaft 1. An upper limit gasket 14 is fitted onto the top of the compression valve plate 13 on the outer wall of piston shaft 1. A second support gasket 15 is fitted onto the top of the upper limit gasket 14 on the outer wall of piston shaft 1. A recovery valve plate 9 is fitted onto the bottom of piston 2 on the outer wall of piston shaft 1. Multiple recovery valve plates 9 are stacked along the outer wall of piston shaft 1. A lower limit gasket 15 is fitted onto the bottom of the recovery valve plate 9 on the outer wall of piston shaft 1. The lower limit shim 10 is fitted with a first support pad 11 at the bottom end of the piston shaft 1, and a nut 12 is fitted at the bottom end of the first support pad 11 on the outer wall of the piston shaft 1. The second support pad 15 includes a floating plate 151; four guide posts 153 equidistantly arranged around the outer edge of the lower surface of the floating plate 151; a pressure plate 154 located directly below the floating plate 151 and fixedly connected to the bottom ends of the four guide posts 153; and a support plate along the guide posts 153. The pad 152 is slidably mounted on the outer wall of the four guide posts 153; and the spring 155 is respectively sleeved on the outer wall of the four guide posts 153 and located between the pad 152 and the pressure plate 154; the pressure plate 154, the floating plate 151 and the pad 152 are all annular metal sheets, the inner diameter of the pressure plate 154 is larger than the outer diameter of the upper limit pad 14, the inner diameter of the floating plate 151 is larger than the maximum outer diameter of the piston shaft 1, and the inner diameter of the pad 152 matches the minimum outer diameter of the piston shaft 1.

[0022] In this embodiment: In existing shock absorber piston valve systems, due to frequent deformation of the compression valve plate 13 and the recovery valve plate 9 during long-term use, the damping performance deteriorates significantly, resulting in a short service life for the compression valve plate 13 and the recovery valve plate 9. Therefore, this solution addresses this by setting an upper limit shim 14 and a lower limit shim 10. During the compression stroke, the upper limit shim 14 provides deformation support for the larger outer diameter compression valve plate 13, thereby improving the durability of the compression valve plate 13 and solving the problem of excessive performance degradation caused by deformation of the compression valve plate 13 after durability. During the rebound stroke, the lower limit shim 10 provides deformation support for the larger outer diameter recovery valve plate 9, thereby improving the durability of the recovery valve plate 9 and solving the problem of excessive performance degradation caused by deformation of the recovery valve plate 9 after durability.

[0023] Secondly, by elastically pressing the outer edge of the compression valve plate by the second support pad 15, when the oil passage output end 5 needs to be closed, the hydraulic oil in the shock absorber pushes the floating plate 151, which in turn causes the floating plate 151 to move down and push the pressure plate 154 to squeeze the outer edge of the compression valve plate 13. This can improve the sealing performance between the compression valve plate 13 and the piston oil passage output end 5, and at the same time, it can also correct the deformed outer edge of the compression valve plate 13, assisting the compression valve plate 13 to fit with the piston oil passage output end 5 and improve the sealing performance. Conversely, when the oil passage output end 5 needs to output oil, the outer edge of the compression valve plate 13 is deformed by the oil pressure and pushes the pressure plate 154 to move up, at which time the oil passage output end 5 is opened.

[0024] It should be noted that piston 2 is composed of two separate press-fitted parts. During the compression stroke, piston shaft 1 drives piston 2 to move downwards. At this time, the hydraulic oil below piston 2, acting as a retaining valve plate 9, keeps the oil passage output end 5 blocked. The hydraulic oil below piston 2 compresses the compression valve plate 13 through the oil passage input end 4, causing the compression valve plate 13 to deform. Then, the hydraulic oil below piston 2 slowly enters the area above piston 2 through the oil passage input end 4. The upper limit gasket 14 provides deformation support and protection for the compression valve plate 13, thereby improving the durability of the compression valve plate 13 and solving the problem of deformation of the compression valve plate 13 after durability. To address the issue of excessive performance degradation, during the rebound stroke, piston shaft 1 drives piston 2 to move upward. At this time, compression valve plate 13, under the action of hydraulic oil above piston 2, keeps the oil passage input end 4 blocked. The hydraulic oil above piston 2 squeezes the recovery valve plate 9 through the oil passage output end 5, causing the recovery valve plate 9 to deform. This allows the hydraulic oil above piston 2 to slowly enter below piston 2 through the oil passage output end 5. The lower limit gasket 10 provides deformation support and protection for the recovery valve plate 9, thereby improving the durability of the recovery valve plate 9 and solving the problem of excessive performance degradation caused by deformation of the recovery valve plate 9 after durability.

[0025] The first support pad 11 in this solution can also adopt the structure of the second support pad 15, which is used to help the oil passage input end 4 fit more closely with the recovery valve plate 9, improve the edge deformation resistance of the recovery valve plate 9, and thus extend its service life.

[0026] Please refer to this carefully. Figure 3 , Figure 4 The oil passage output end 5 has a 7-shaped structure, the piston 2 has a stepped structure, the bottom end of the oil passage output end 5 extends to the bottom end of the piston 2, and the top end of the oil passage output end 5 extends to the upper outer wall of the piston 2.

[0027] In this embodiment: During the compression stroke, the hydraulic oil in the oil passage inlet 4 and outlet 5 inside the existing piston 2 causes the hydraulic oil to compress the compression valve plate 13 and deform slightly. During the rebound stroke, the hydraulic oil also causes the hydraulic oil to compress the recovery valve plate 9 and deform slightly. This results in excessive performance degradation due to deformation of the recovery valve plate 9 and the compression valve plate 13 after durability. By using the 7-shaped oil passage outlet 5 in conjunction with the stepped piston 2, the hydraulic oil does not cause slight deformation when compressing the compression valve plate 13 during the compression stroke, nor does it cause slight deformation when compressing the recovery valve plate 9 during the rebound stroke, thereby improving the durability of the recovery valve plate 9 and the compression valve plate 13.

[0028] Please refer to this carefully. Figure 4 A blocking ring 8 is provided at the top of the interior of the recessed part 7. The blocking ring 8 and the piston 2 are integrally cast.

[0029] In this embodiment: by setting a blocking ring 8, the top end of the restoration valve plate 9 contacts the bottom end of the blocking ring 8, thereby blocking the oil passage output end 5.

[0030] Please refer to this carefully. Figure 3 , Figure 4 The lower outer wall of piston 2 is provided with annular grooves, and there are multiple annular grooves. The inner wall of rubber ring 3 is provided with annular protrusions that match the annular grooves. Rubber ring 3 is fixed to the lower outer wall of piston 2 by fitting the annular grooves and annular protrusions together.

[0031] In this embodiment: the annular groove and the annular protrusion work together to fix the rubber ring 3 to the lower outer wall of the piston 2. Please refer to the following for details. Figure 3 , Figure 8 The top of the pad 152 is attached to the bottom of the upper outer wall of the piston shaft 1, and the outer diameter of the upper limit pad 14 is larger than the outer diameter of the uppermost compression valve plate 13.

[0032] In this embodiment: by setting the second support pad 15, the upper limit pad 14 is limited and fixed, and the upper limit pad 14 provides deformation support for the compression valve plate 13 with a larger outer diameter, thereby improving the durability of the compression valve plate 13 and solving the problem of excessive performance degradation caused by deformation of the compression valve plate 13 after durability.

[0033] Please refer to this carefully. Figure 3 , Figure 7 The outer diameter of the lower limit gasket 10 is greater than the outer diameter of the bottommost restoration valve plate 9, and the outer diameter of the first restoration valve plate 9 below the blocking ring 8 is greater than the outer diameter of the blocking ring 8.

[0034] In this embodiment, the lower limit pad 10 provides deformation support for the larger outer diameter recovery valve plate 9, thereby improving the durability of the recovery valve plate 9 and solving the problem of excessive performance degradation caused by deformation of the recovery valve plate 9 after durability.

[0035] Please refer to this carefully. Figure 1 , Figure 2 The outer wall of piston shaft 1 is provided with a threaded groove located below piston 2, and the threaded groove matches the inner wall of nut 12.

[0036] In this embodiment, the first support pad 11 is fixed by rotating and moving the nut 12 along the threaded groove.

[0037] Please refer to this carefully. Figure 3 The top of piston 2 is located on the outer wall of groove 6 and has a connecting groove. The connecting groove has a ring structure. The outer diameter of the first layer of compression valve plate 13 above piston 2 matches the upper outer diameter of piston 2.

[0038] In this embodiment: during the rebound stroke, the groove 6 and the connecting groove are sealed by the first layer of compression valve plate 13 above the piston 2.

[0039] Please refer to this carefully. Figure 1 and Figure 2 The inner wall of piston 2 is provided with a sealing ring.

[0040] In this embodiment: by providing a sealing ring, when the piston 2 is sleeved and fixed on the outer wall of the piston shaft 1, the hydraulic oil cannot penetrate through the contact position between the piston 2 and the piston shaft 1, thereby achieving a sealed connection between the piston 2 and the piston shaft 1.

[0041] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A shock absorber piston valve limit protection structure, comprising a piston shaft (1), the outer wall of the piston shaft (1) is sleeved with a piston (2), the outer wall of the piston (2) is sleeved with a rubber ring (3), the inside of the piston (2) is provided with four oil channel input ends (4) and four oil channel output ends (5), the oil channel input ends (4) and the oil channel output ends (5) are alternately arranged in a ring shape along the inside of the piston (2), the top end of the oil channel input end (4) is embedded with a groove (6) in the inside of the piston (2), and the bottom end of the inside of the piston (2) is embedded with a recess (7), characterized in that, The outer wall of the piston shaft (1) is sleeved with a compression valve piece (13) at the top end of the piston (2), a plurality of compression valve pieces (13) are stacked along the outer wall of the piston shaft (1), the outer wall of the piston shaft (1) is sleeved with an upper limiting gasket (14) at the top end of the compression valve piece (13), the outer wall of the piston shaft (1) is sleeved with a second supporting pad (15) at the top end of the upper limiting gasket (14), the outer wall of the piston shaft (1) is sleeved with a recovery valve piece (9) at the bottom end of the piston (2), a plurality of recovery valve pieces (9) are stacked along the outer wall of the piston shaft (1), the outer wall of the piston shaft (1) is sleeved with a lower limiting gasket (10) at the bottom end of the recovery valve piece (9), the outer wall of the piston shaft (1) is sleeved with a first supporting pad (11) at the bottom end of the lower limiting gasket (10), and the outer wall of the piston shaft (1) is sleeved with a nut (12) at the bottom end of the first supporting pad (11). The second supporting pad (15) comprises: a floating piece (151); four guide columns (153) equidistantly arranged at the outer edge of the lower surface of the floating piece (151); a pressing piece (154) arranged below the floating piece (151) and fixedly connected with the bottom ends of the four guide columns (153); a pad body (152) slidingly installed on the outer wall of the four guide columns (153) along the length of the guide columns (153); and springs (155) respectively sleeved on the outer wall of the four guide columns (153) and located between the pad body (152) and the pressing piece (154).

2. A piston valve check structure for a shock absorber according to claim 1, wherein The oil channel output end (5) has a 7-shaped structure, the piston (2) has a stepped structure, the bottom end of the oil channel output end (5) penetrates to the bottom end of the piston (2), and the top end of the oil channel output end (5) penetrates to the upper outer wall of the piston (2).

3. A piston valve check structure for a shock absorber according to claim 2, wherein The inner top end of the recess (7) is provided with a blocking ring (8), and the blocking ring (8) and the piston (2) are integrally cast.

4. A piston valve check structure for a shock absorber according to claim 3, wherein The lower outer wall of the piston (2) is provided with annular grooves, the inner wall of the rubber ring (3) is provided with annular protrusions matched with the annular grooves, and the rubber ring (3) is fixedly sleeved on the lower outer wall of the piston (2) through the annular grooves and the annular protrusions.

5. A piston valve check structure for a shock absorber according to claim 4, wherein The top end of the second supporting pad (15) is attached to the bottom end of the upper outer wall of the piston shaft (1), and the outer diameter of the upper limiting gasket (14) is greater than the outer diameter of the uppermost compression valve piece (13).

6. A piston valve check structure for a shock absorber according to claim 5, wherein The outer diameter of the lower limiting gasket (10) is greater than the outer diameter of the bottommost recovery valve piece (9), and the outer diameter of the first recovery valve piece (9) below the blocking ring (8) is greater than the outer diameter of the blocking ring (8).

7. A piston valve check structure for a shock absorber according to claim 6, wherein The outer wall of the piston shaft (1) is provided with a threaded groove below the piston (2), and the threaded groove is matched with the inner wall of the nut (12).

8. A piston valve check structure for a shock absorber according to claim 7, wherein The top end of the piston (2) is embedded with a connecting groove in the outer wall of the groove (6), the connecting groove is annular structure, the outer diameter of the first layer of compression valve sheet (13) above the piston (2) matches the upper outer diameter of the piston (2).

9. A piston valve check structure for a shock absorber according to claim 8, wherein The inner wall of the piston (2) is provided with a sealing ring.

10. A piston valve check structure for a shock absorber according to claim 1, wherein The pressing sheet (154), the floating sheet (151) and the pad (152) are all circular metal sheets, the inner diameter of the pressing sheet (154) is greater than the outer diameter of the upper limiting pad (14), the inner diameter of the floating sheet (151) is greater than the maximum outer diameter of the piston shaft (1), and the inner diameter of the pad (152) matches the minimum outer diameter of the piston shaft (1).

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