Hydraulic damper

Abstract

A hydraulic damper comprises a cylinder body and a damping assembly arranged in the cylinder body in a telescopic mode, the damping assembly comprises a piston body, the piston body divides an inner cavity of the cylinder body into a first oil cavity and a second oil cavity which are communicated with each other, a first elastic piece and a second elastic piece are arranged on the piston body, the first elastic piece is located on the first oil cavity, and the second elastic piece is located on the second oil cavity. A first channel communicated with the second oil cavity is arranged between the piston body and the second elastic piece, the first elastic piece seals the first channel, a second channel communicated with the first oil cavity is arranged between the piston body and the first elastic piece, and the second elastic piece seals the second channel. According to the hydraulic damper, when the damping assembly is compressed with large force, oil pressure of the second oil cavity acts on the first elastic piece through the first channel, so that the first elastic piece elastically deforms and opens the first channel, the second oil cavity communicates with the first oil cavity through the first channel, and therefore the number of damping flow channels is increased, and rapid pressure unloading is achieved; and the product or the damper is prevented from being damaged by too high pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of dampers, and particularly to a hydraulic damper. Background Art

[0002] Existing hydraulic dampers have the following disadvantages: 1. When the damper is compressed forcefully, due to the lack of an effective pressure unloading mechanism in the damper, it is easy to cause damage to the structure of the hydraulic damper itself or the product (the product connected to the damper); 2. When the existing hydraulic damper switches between the retracted and extended states, there will be a dead stroke of non-damped movement. This is because at the moment of commutation, the flow state of the hydraulic oil changes suddenly, resulting in the damping force not being established in time, causing the product to be in a non-damped movement state within a short distance, which affects the smoothness of movement and control accuracy; 3. Due to the cumulative errors of various factors such as the machining accuracy of parts and the assembly process during the production of hydraulic dampers, there are obvious differences in the actual movement speed and damping magnitude of different dampers. Even for products of the same batch, it is difficult to achieve highly consistent performance under the same working conditions, which brings great troubles to application scenarios that require high-precision control, such as the shock absorption and stability control of precision instruments.

[0003] Therefore, it is necessary to make further improvements. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydraulic damper with a simple structure, convenient adjustment, high reliability, capable of eliminating the non-damped phenomenon, and strong practicability, so as to overcome the deficiencies of the prior art.

[0005] A hydraulic damper designed according to this purpose includes a cylinder body and a damping component telescopically arranged in the cylinder body. The damping component includes a piston body, and the piston body divides the inner cavity of the cylinder body into a first oil cavity and a second oil cavity that communicate with each other. Its characteristics are as follows: A first elastic sheet and a second elastic sheet are arranged on the piston body. The first elastic sheet is located on the first oil cavity, and the second elastic sheet is located on the second oil cavity. A first channel communicating with the second oil cavity is arranged between the piston body and the second elastic sheet, and the first elastic sheet closes the first channel. A second channel communicating with the first oil cavity is arranged between the piston body and the first elastic sheet, and the second elastic sheet closes the second channel; When the damping component is compressed forcefully, the oil pressure in the second oil cavity acts on the first elastic sheet through the first channel, causing the first elastic sheet to elastically deform and open the first channel, and the second oil cavity communicates with the first oil cavity through the first channel; when the compression of the damping component stops, the first elastic sheet elastically returns to its original position to close the first channel; When the damping component is pulled out, the oil pressure in the first oil cavity acts on the second elastic sheet through the second channel, causing the second elastic sheet to elastically deform and open the second channel, and the first oil cavity communicates with the second oil cavity through the second channel; when the compression force of the damping component decreases, the second elastic sheet elastically returns to its original position to close the second channel.

[0006] An active piston assembly is provided on the second oil chamber. The active piston assembly includes an active piston and an elastic member. The elastic member is disposed between the active piston and the cylinder block. When the damping assembly is pulled out, the active piston moves upward under the elastic force of the elastic member. When the damping assembly is compressed, it acts on the active piston to cause the active piston to move downward and compress the elastic member, maintaining the state that the damping oil in the second oil chamber is always filled.

[0007] A first sealing ring and a first gap are provided between the piston body and the cylinder block. The first gap communicates with the first oil chamber and the second oil chamber respectively. The first sealing ring is located in the middle of the first gap. More than one oil passage groove is provided on the inner side of the cylinder block. When the damping assembly expands and contracts, it drives the first sealing ring to move up and down. When the first sealing ring moves up and down to a position where there is no oil passage groove, the first sealing ring closes the first gap. When the first sealing ring moves up and down to a position where there is an oil passage groove, the first oil chamber communicates with the second oil chamber through the first gap and the oil passage groove.

[0008] The piston body includes a first piston and a second piston which are arranged up and down and rotate relative to each other. A first elastic sheet is provided on the top of the first piston. A second elastic sheet is provided between the first piston and the second piston. A first through hole and a second through hole are provided on the first piston. A third through hole is provided on the first elastic sheet. A fourth through hole is provided on the second elastic sheet. The first through hole communicates with the fourth through hole and forms a first passage. The fourth through hole communicates with the second oil chamber. The second through hole communicates with the third through hole and forms a second passage. The third through hole communicates with the first oil chamber.

[0009] A fifth through hole communicating with the first oil chamber is provided on the first piston. A sixth through hole communicating with the second oil chamber is provided on the second piston. An intermediate flow passage is provided between the first piston and the second piston. The fifth through hole communicates with the sixth through hole through the intermediate flow passage. When the first piston and the second piston rotate relative to each other, the length of the intermediate flow passage is adjustable. An arc-shaped flow passage is provided on the second piston. One end of the flow passage communicates with the sixth through hole. When the first piston and the second piston rotate relative to each other, the fifth through hole slides relative to the flow passage. The part of the flow passage that conducts the fifth through hole and the sixth through hole constitutes the intermediate flow passage.

[0010] A number of adjusting holes with different diameters are annularly provided on the first piston. The adjusting holes communicate with the first oil chamber. A sixth through hole communicating with the second oil chamber is provided on the second piston. When the sixth through hole communicates with the adjusting holes, an intermediate flow passage is formed. When the first piston and the second piston rotate relative to each other, by rotating the sixth through hole to the positions of different adjusting holes, the size of the intermediate flow passage can be adjusted.

[0011] A fifth through-hole communicating with the first oil chamber is provided on the first piston, a seventh through-hole communicating with the fifth through-hole is provided on the second elastic sheet, a slope with a gradually changing height is provided on the second piston, and a second gap is left between the slope and the seventh through-hole. The seventh through-hole communicates with the second oil chamber through the second gap. The fifth through-hole, the seventh through-hole and the second gap form an intermediate flow path. When the first piston and the second piston rotate relative to each other, the size of the second gap is adjusted, and thus the size of the intermediate flow path is adjusted.

[0012] The damping assembly further includes a piston shaft. The piston shaft passes through the first piston and the second piston. The piston shaft is fixedly connected to the second piston and is rotationally matched with the first piston. When the piston shaft rotates, it drives the second piston to rotate, so that the first piston and the second piston rotate relative to each other.

[0013] The shape of the first piston is non-circular, the shape of the inner cavity is non-circular, the first piston is fixed on the inner cavity, the shape of the second piston is circular, and the second piston is rotatably arranged on the inner cavity.

[0014] It further includes a cover body. The cover body is fixed to the top of the cylinder block. The piston shaft passes through the cover body and extends out of the cylinder block. A sealing assembly is arranged below the cover body. The sealing assembly is sleeved on the piston shaft, and the piston body is limited to move up and down on the inner cavity.

[0015] The hydraulic damper of the present invention has the following beneficial effects: 1. By providing the first elastic sheet and the second elastic sheet on the piston body, a first channel communicating with the second oil chamber is provided between the piston body and the second elastic sheet, and a second channel communicating with the first oil chamber is provided between the piston body and the first elastic sheet. When the damping assembly is compressed with great force, the oil pressure in the second oil chamber acts on the first elastic sheet through the first channel, so that the first elastic sheet is elastically deformed and the first channel is opened. The second oil chamber communicates with the first oil chamber through the first channel, thereby increasing the damping flow path, realizing rapid pressure unloading, effectively reducing the internal pressure peak of the damper, and preventing damage to the product or the damper itself caused by excessive pressure. 2. Through the assistance of the first elastic sheet and the second elastic sheet, as well as the design of the first sealing ring and the cooperation with the piston body, the phenomenon of no damping during the conversion of the damper between the compressed state and the extended state is basically completely eliminated. During the commutation process, the damping force can achieve a smooth transition, ensuring the continuity and stability of the product movement, and improving the control accuracy and reliability of the system. 3. An adjustable intermediate flow path is provided between the first piston and the second piston, thereby changing the flow velocity of the damping oil and the magnitude of the resistance, so as to achieve precise adjustment of the damping velocity and magnitude, meet the diverse damping requirements of different application scenarios. Whether it is a precision instrument that requires fine control or a heavy mechanical equipment with high damping requirements, the precise damping adjustment requirements under different working conditions can be met through a simple operation (rotating the piston shaft), greatly improving the adaptability and working efficiency of the equipment.

[0016] 4. The cylinder block can be provided with multiple different oil flow channels (oil grooves), and different damping and damping speeds can be controlled in different motion stages according to different requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the hydraulic damper in the first embodiment of the present invention.

[0018] Figure 2 It is a cross-sectional view of the hydraulic damper in another orientation in the first embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of the overall structure of the hydraulic damper in the first embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the exploded structure of the hydraulic damper in the third embodiment of the present invention.

[0021] Figure 5 It is a cross-sectional view of the damping assembly in the first embodiment of the present invention.

[0022] Figure 6 It is a schematic diagram of the exploded structure of the damping assembly in the first embodiment of the present invention.

[0023] Figure 7 It is a cross-sectional view of the damping assembly in the second embodiment of the present invention.

[0024] Figure 8 It is a schematic diagram of the exploded structure of the damping assembly in the second embodiment of the present invention.

[0025] Figure 9 It is a cross-sectional view of the damping assembly in the third embodiment of the present invention.

[0026] Figure 10 It is a schematic diagram of the exploded structure of the damping assembly in the third embodiment of the present invention.

[0027] Figure 11 It is a schematic diagram of the overall structure of the damping assembly in the first embodiment of the present invention.

[0028] Figure 12 It is a schematic diagram of the overall structure of the cylinder block in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be further described below in conjunction with the drawings and embodiments.

[0030] First Embodiment: Refer to Figures 1 - 3 、 Figures 5 - 6 、 Figures 11 - 12, this hydraulic damper includes a cylinder block 1 and a damping component A telescopically arranged inside the cylinder block 1. The damping component A includes a piston body. The piston body divides the inner cavity B of the cylinder block 1 into a mutually connected first oil chamber 2 and a second oil chamber 3. A first elastic sheet 4 and a second elastic sheet 5 are arranged on the piston body. The first elastic sheet 4 is located above the first oil chamber 2, and the second elastic sheet 5 is located above the second oil chamber 3. A first channel 6 communicating with the second oil chamber 3 is arranged between the piston body and the second elastic sheet 5. The first elastic sheet 4 closes the first channel 6. A second channel 7 communicating with the first oil chamber 2 is arranged between the piston body and the first elastic sheet 4. The second elastic sheet 5 closes the second channel 7; When the damping component A is compressed with great force, the oil pressure in the second oil chamber 3 acts on the first elastic sheet 4 through the first channel 6, causing the first elastic sheet 4 to elastically deform and open the first channel 6. The second oil chamber 3 communicates with the first oil chamber 2 through the first channel 6. Then, the damping oil in the second oil chamber 3 can flow to the first oil chamber 2 through the first channel 6 to increase the damping flow path and achieve pressure unloading, preventing the damper itself and the product from being damaged. When the compression force of the damping component A decreases, the first elastic sheet 4 elastically returns to its original position to close the first channel 6 to maintain a certain damping. The first elastic sheet 4 has a large elastic force and a large deformation force.

[0031] When the damping component A is pulled out, the oil pressure in the first oil chamber 2 acts on the second elastic sheet 5 through the second channel 7, causing the second elastic sheet 5 to elastically deform and open the second channel 7. The first oil chamber 2 communicates with the second oil chamber 3 through the second channel 7. Then, the damping oil in the first oil chamber 2 can quickly flow to the second oil chamber 3 through the second channel 7, and the damping is small. The second elastic sheet 5 has a small elastic force. When the damping component A stops being pulled out, the second elastic sheet 5 elastically returns to its original position to close the second channel 7.

[0032] The material of the first elastic sheet 4 is selected as a special alloy material with a high elastic limit and good fatigue performance, and through precise heat treatment processes to ensure stable elastic performance under different temperature and stress conditions; when the damping component A is compressed with great force, the first elastic sheet 4 will deform under the combined action of oil pressure and mechanical force, and the degree of its deformation is related to the magnitude of the external force. The deformation of the elastic sheet will instantly expand the originally narrow damping oil flow path, increasing the flow path and cross-sectional area of the damping oil, thereby achieving rapid pressure unloading, effectively reducing the pressure peak inside the damper, and preventing damage to the product caused by excessive pressure. When the external force decreases, the first elastic sheet 4 quickly returns to its original position by virtue of its own elasticity, resumes its initial state, and continues to maintain a certain damping force to maintain damping.

[0033] The second elastic piece 5 has a special shape and elastic coefficient in its structural design; when the damping component A is pulled out, under the action of oil pressure, the second elastic piece 5 will deform and spring open against its own elastic force, forming a larger flow channel, enabling the damping oil to pass through quickly. At this time, the damping is small, facilitating the quick pulling-out operation of the damping component A and improving the response speed of the damper. When the piston stops pulling out, the second elastic piece 5 will quickly reset within an extremely short time and restore the sealed state to prevent hydraulic oil leakage, ensuring the stability and reliability of the damper and the normal operation of the damper.

[0034] An active piston assembly is provided at the bottom of the second oil chamber 3. The active piston assembly includes an active piston 8 and an elastic member 9. The elastic member 9 is a spring, and the elastic member 9 is provided between the active piston 8 and the cylinder block 1; when the damping component A is pulled out, the active piston 8 moves upward under the elastic force of the elastic member 9 to adjust the full oil in the second oil chamber 3 and maintain the state where the damping oil in the second oil chamber 3 is always filled, so as to prevent the damping component A from jumping when reversing. When the damping component A is compressed, it acts on the active piston 8 to cause the active piston 8 to move downward and compress the elastic member 9.

[0035] A first sealing ring 10 and a first gap 11 are provided between the piston body (the first piston 13) and the cylinder block 1. The first gap 11 communicates with the first oil chamber 2 and the second oil chamber 3 respectively. The first sealing ring 10 is located in the middle of the first gap 11. One or more oil passing grooves 12 are provided on the inner side of the cylinder block 1. When multiple oil passing grooves 12 are provided, the oil passing grooves 12 can be annularly distributed on the inner side of the cylinder block 1 or vertically distributed on the inner side of the cylinder block 1. In this embodiment, 2 oil passing grooves 12 are annularly distributed and 2 groups are vertically distributed; when the damping component A expands and contracts, it drives the first sealing ring 10 to move up and down. When the first sealing ring 10 moves up and down to a position where there is no oil passing groove 12, the first sealing ring 10 closes the first gap 11. At this time, there will be a certain resistance when the damping component A expands and contracts. When the first sealing ring 10 moves up and down to a position where there is an oil passing groove 12, the first oil chamber 2 communicates with the second oil chamber 3 through the first gap 11 and the oil passing groove 12. At this time, the resistance when the damping component A expands and contracts will be greatly reduced. This structure can adjust the damping magnitude of the damping component A during the expansion and contraction process; in addition, according to the requirements of the use scenario, the damping magnitude of the damping component A can be changed during the expansion and contraction process.

[0036] The piston body includes a first piston 13 and a second piston 14 which are arranged up and down and rotate relative to each other. A first elastic sheet 4 is arranged on the top of the first piston 13. A second elastic sheet 5 is pressed between the first piston 13 and the second piston 14. A first through hole 15 and a second through hole 16 are arranged on the first piston 13. A third through hole 17 is arranged on the first elastic sheet 4. A fourth through hole 18 is arranged on the second elastic sheet 5. The first through hole 15 communicates with the fourth through hole 18 and forms a first channel 6. The fourth through hole 18 communicates with the second oil chamber 3. The second through hole 16 communicates with the third through hole 17 and forms a second channel 7. The third through hole 17 communicates with the first oil chamber 2.

[0037] A fifth through hole 19 communicating with the first oil chamber 2 is arranged on the first piston 13. A sixth through hole 20 communicating with the second oil chamber 3 is arranged on the second piston 14. An intermediate flow channel is arranged between the first piston 13 and the second piston 14. The fifth through hole 19 communicates with the sixth through hole 20 through the intermediate flow channel. When the first piston 13 and the second piston 14 rotate relative to each other, the length of the intermediate flow channel is adjustable; thereby changing the flow velocity of the damping oil and the magnitude of the resistance. The greater the length of the intermediate flow channel, the smaller the flow velocity of the damping oil and the greater the damping force. The smaller the length of the intermediate flow channel, the greater the flow velocity of the damping oil and the smaller the damping force; this structure can achieve stepless adjustment of the damping force; An arc-shaped flow channel 21 is arranged on the second piston 14. One end of the flow channel 21 communicates with the sixth through hole 20. When the first piston 13 and the second piston 14 rotate relative to each other, the fifth through hole 19 slides relative to the flow channel 21. The part of the flow channel 21 that conducts the fifth through hole 19 and the sixth through hole 20 constitutes the intermediate flow channel.

[0038] An eighth through hole 28 is arranged on the first elastic sheet 4. A ninth through hole 29 is arranged on the second elastic sheet 5. The fifth through hole 19 communicates with the first oil chamber 2 through the eighth through hole 28. The fifth through hole 19 communicates with the intermediate flow channel through the ninth through hole 29.

[0039] The damping assembly A further includes a piston shaft 26. The piston shaft 26 passes through the first piston 13 and the second piston 14. The piston shaft 26 is fixedly connected to the second piston 14. The piston shaft 26 is rotationally matched with the first piston 13. When the piston shaft 26 rotates, it drives the second piston 14 to rotate, so that the first piston 13 and the second piston 14 rotate relative to each other; the piston shaft 26 is rotated manually; The piston shaft 26 includes a circular first shaft body 30 and a non-circular second shaft body 31. A circular rotation hole 32 is arranged on the first piston 13. A non-circular connection hole 33 is arranged on the second piston 14. The first shaft body 30 is rotationally matched with the rotation hole 32. The second shaft body 31 is inserted into the connection hole 33.

[0040] The shape of the first piston 13 is non-circular, the shape of the inner cavity B is non-circular, the first piston 13 is fixed on the inner cavity B, the first piston 13 cooperates with the inner cavity B, and there is no relative rotation between the first piston 13 and the inner cavity B. The shape of the second piston 14 is circular, and the second piston 14 is rotatably arranged on the inner cavity B.

[0041] It further includes a cover body 27. The cover body 27 is fixed to the top end of the cylinder block 1. The piston shaft 26 passes through the cover body 27 and extends outside the cylinder block 1. A sealing assembly is arranged below the cover body 27. The sealing assembly is sleeved on the piston shaft 26. The piston body is vertically limited and movable on the inner cavity B. The damping assembly A is limited on the sealing assembly when it is pulled upward. The sealing assembly is arranged between the piston shaft 26 and the cylinder block 1 and includes a second sealing ring 34 and a washer 35 arranged up and down. The second sealing ring 34 plays a sealing role to prevent the damping oil from leaking out of the cylinder block 1. By optimizing the structural design of the piston body and the cylinder block 1 and reasonably arranging the position and quantity of the sealing rings, it is ensured that the sealing rings can always maintain a stable sealing state during the commutation process of the damper, avoiding the phenomenon of crosstalk.

[0042] A sealing groove 36 is provided on the first piston 13, and the first sealing ring 10 is sleeved on the sealing groove 36.

[0043] First washers 37 and second washers 38 are respectively arranged at the upper and lower ends of the second shaft body 31. The first elastic sheet 4 is pressed between the first washer 37 and the first piston 13, and the second washer 38 is located at the bottom of the second piston 14.

[0044] During the use of the existing hydraulic damper, due to the temperature changes in spring, summer, autumn and winter, the speed changes during the movement of the product. When the temperature is high, the damping is small and the speed is fast; when the temperature is low, the damping is large and the speed is slow. This hydraulic damper can effectively reduce the influence of temperature changes on the damping performance through the careful selection of the damping oil and the unique structural design. In a wide temperature range (such as -40°C to 120°C), the speed change rate of the damper is reduced by more than 80% compared with the traditional hydraulic damper, and it can maintain a relatively stable damping force output, providing a strong guarantee for the reliable operation of the equipment under different ambient temperatures, and is particularly suitable for equipment working under extreme climate conditions, such as aerospace equipment, field operation machinery, etc.

[0045] This hydraulic damper can flexibly set segmented resistance according to specific application requirements; through the structural design of the first piston 13 and the second piston 14 and the control of the damping adjustment mechanism, the damping magnitude can change according to a preset law during the movement of the piston; for example, at the equipment startup stage, a smaller damping is set to facilitate quick startup; during the operation process, the damping magnitude is automatically adjusted according to the load change to ensure the smoothness of operation; at the stop stage, the damping is increased to achieve quick braking; this segmented resistance setting function further expands the application range of the damper and improves the intelligence and adaptability of the equipment.

[0046] This hydraulic damper is applied to hinges and can also be applied to other fields such as equipment.

[0047] Second Embodiment: See Figures 7 - 8 , this hydraulic damper is different from the first embodiment in that: A number of adjustment holes 22 with different diameters are evenly distributed in a ring on the first piston 13. The adjustment holes 22 communicate with the first oil chamber 2. A sixth through hole 20 communicating with the second oil chamber 3 is provided on the second piston 14. When the sixth through hole 20 communicates with the adjustment holes 22, an intermediate flow channel is formed. When the first piston 13 and the second piston 14 rotate relative to each other, the sixth through hole 20 rotates to the positions of different adjustment holes 22 to adjust the size of the intermediate flow channel, thereby changing the flow velocity of the damping oil and the magnitude of the resistance. The larger the intermediate flow channel, the greater the flow velocity of the damping oil and the smaller the damping force. The smaller the intermediate flow channel, the smaller the flow velocity of the damping oil and the greater the damping force; this structure can achieve stepped (gear) adjustment of the damping force.

[0048] A number of tenth through holes 39 are evenly distributed in a ring on the first elastic sheet 4, and a number of eleventh through holes 40 are evenly distributed in a ring on the second elastic sheet 5. The adjustment holes 22 communicate with the first oil chamber 2 through the tenth through holes 39, and the adjustment holes 22 communicate with the sixth through hole 20 through the eleventh through holes 40.

[0049] Other parts not described are the same as those in the first embodiment and will not be analyzed and described here.

[0050] Third Embodiment: See Figure 4 , Figures 9 - 10 , this hydraulic damper is different from the first embodiment in that: A fifth through-hole 19 communicating with the first oil chamber 2 is provided on the first piston 13. A seventh through-hole 25 communicating with the fifth through-hole 19 is provided on the second elastic sheet 5. An inclined surface 23 with a gradually changing height is provided on the second piston 14. A second gap 24 is left between the inclined surface 23 and the seventh through-hole 25. The seventh through-hole 25 communicates with the second oil chamber 3 through the second gap 24. The fifth through-hole 19, the seventh through-hole 25 and the second gap 24 form an intermediate flow channel. When the first piston 13 and the second piston 14 rotate relative to each other, the size of the second gap 24 is adjusted, thereby adjusting the size of the intermediate flow channel, and further changing the flow velocity of the damping oil and the magnitude of the resistance. The larger the intermediate flow channel, the greater the flow velocity of the damping oil and the smaller the damping force. The smaller the intermediate flow channel, the smaller the flow velocity of the damping oil and the greater the damping force. This structure can achieve stepless adjustment of the damping force.

[0051] A twelfth through-hole 41 is provided on the first elastic sheet 4. The fifth through-hole 19 communicates with the first oil chamber 2 through the twelfth through-hole 41.

[0052] Other parts not described are the same as those in the first embodiment and will not be analyzed and described here.

[0053] The above is the preferred solution of the present invention, which shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic damper, comprising a cylinder (1) and a damping assembly (A) telescopically arranged in the cylinder (1), the damping assembly (A) comprising a piston body, the piston body dividing an inner cavity (B) of the cylinder (1) into a first oil cavity (2) and a second oil cavity (3) which are interconnected, characterized in that: A first spring sheet (4) and a second spring sheet (5) are provided on the piston body, the first spring sheet (4) is located on the first oil chamber (2), the second spring sheet (5) is located on the second oil chamber (3), a first channel (6) communicating with the second oil chamber (3) is provided between the piston body and the second spring sheet (5), the first spring sheet (4) closes the first channel (6), a second channel (7) communicating with the first oil chamber (2) is provided between the piston body and the first spring sheet (4), the second spring sheet (5) closes the second channel (7); When the damping component (A) is compressed with great force, the oil pressure of the second oil chamber (3) acts on the first spring plate (4) through the first channel (6), so that the first spring plate (4) is elastically deformed and the first channel (6) is opened, and the second oil chamber (3) is connected to the first oil chamber (2) through the first channel (6); when the compression force of the damping component (A) is reduced, the first spring plate (4) is elastically reset to close the first channel (6); When the damping assembly (A) is pulled out, the oil pressure of the first oil chamber (2) acts on the second spring plate (5) through the second channel (7), so that the second spring plate (5) is elastically deformed and the second channel (7) is opened, and the first oil chamber (2) is connected to the second oil chamber (3) through the second channel (7); when the damping assembly (A) stops being pulled out, the second spring plate (5) is elastically reset to close the second channel (7).

2. The hydraulic damper according to claim 1, characterized in that: The second oil chamber (3) is provided with a movable piston assembly, which comprises a movable piston (8) and an elastic member (9), wherein the elastic member (9) is arranged between the movable piston (8) and the cylinder body (1); when the damping assembly (A) is pulled out, the movable piston (8) moves upward under the elastic force of the elastic member (9), and when the damping assembly (A) is compressed, it acts on the movable piston (8), so that the movable piston (8) moves downward and compresses the elastic member (9), thereby keeping the damping oil in the second oil chamber (3) filled up all the time.

3. The hydraulic damper according to claim 1, characterized in that: A first sealing ring (10) and a first gap (11) are provided between the piston body and the cylinder body (1); the first gap (11) is connected to the first oil chamber (2) and the second oil chamber (3) respectively; the first sealing ring (10) is located in the middle of the first gap (11); and one or more oil grooves (12) are provided on the inner side of the cylinder body (1); when the damping assembly (A) is extended or retracted, it drives the first sealing ring (10) to move up and down; when the first sealing ring (10) moves up and down to a position not passing through the oil groove (12), the first sealing ring (10) closes the first gap (11); when the first sealing ring (10) moves up and down to a position passing through the oil groove (12), the first oil chamber (2) is connected to the second oil chamber (3) through the first gap (11) and the oil groove (12).

4. The hydraulic damper according to claim 1, characterized in that: The piston body comprises a first piston (13) and a second piston (14) which are arranged up and down and rotate relatively to each other, a first spring sheet (4) is arranged on the top of the first piston (13), a second spring sheet (5) is arranged between the first piston (13) and the second piston (14), a first through hole (15) and a second through hole (16) are arranged on the first piston (13), a third through hole (17) is arranged on the first spring sheet (4), a fourth through hole (18) is arranged on the second spring sheet (5), the first through hole (15) is connected to the fourth through hole (18) to form a first channel (6), the fourth through hole (18) is connected to the second oil chamber (3), the second through hole (16) is connected to the third through hole (17) to form a second channel (7), and the third through hole (17) is connected to the first oil chamber (2).

5. The hydraulic damper according to claim 4, characterized in that: The first piston (13) is provided with a fifth through hole (19) connected to the first oil chamber (2), the second piston (14) is provided with a sixth through hole (20) connected to the second oil chamber (3), an intermediate flow channel is provided between the first piston (13) and the second piston (14), the fifth through hole (19) is connected to the sixth through hole (20) via the intermediate flow channel, and when the first piston (13) and the second piston (14) rotate relative to each other, the length of the intermediate flow channel is adjustable; The second piston (14) is provided with an arc-shaped flow channel (21), one end of the flow channel (21) is connected to the sixth through hole (20), when the first piston (13) and the second piston (14) rotate relative to each other, the fifth through hole (19) slides relatively along the flow channel (21), and the portion of the flow channel (21) that is connected to the fifth through hole (19) and the sixth through hole (20) constitutes an intermediate flow channel.

6. The hydraulic damper according to claim 4, characterized in that: The first piston (13) is provided with a plurality of adjusting holes (22) of different diameters in an annular shape, the adjusting holes (22) being connected to the first oil chamber (2), the second piston (14) being provided with a sixth through hole (20) being connected to the second oil chamber (3), the sixth through hole (20) forming an intermediate flow channel when connected to the adjusting hole (22), and when the first piston (13) and the second piston (14) rotate relative to each other, the sixth through hole (20) rotates to the position of different adjusting holes (22) to adjust the size of the intermediate flow channel.

7. The hydraulic damper according to claim 4, characterized in that: The first piston (13) is provided with a fifth through hole (19) communicating with the first oil chamber (2); the second spring piece (5) is provided with a seventh through hole (25) communicating with the fifth through hole (19); the second piston (14) is provided with a gradually changing inclined surface (23); a second gap (24) is left between the inclined surface (23) and the seventh through hole (25); the seventh through hole (25) is connected to the second oil chamber (3) via the second gap (24); the fifth through hole (19), the seventh through hole (25) and the second gap (24) form an intermediate flow channel; when the first piston (13) and the second piston (14) rotate relative to each other, the size of the second gap (24) is adjusted, thereby adjusting the size of the intermediate flow channel.

8. The hydraulic damper according to any one of claims 5 to 7, characterized in that: The damping assembly (A) further comprises a piston shaft (26), the piston shaft (26) passing through the first piston (13) and the second piston (14), the piston shaft (26) being fixedly connected to the second piston (14), the piston shaft (26) and the first piston (13) being rotationally matched, and when the piston shaft (26) rotates, the second piston (14) is driven to rotate, so that the first piston (13) and the second piston (14) rotate relative to each other.

9. The hydraulic damper according to claim 8, characterized in that: The first piston (13) is non-circular in shape, the inner cavity (B) is non-circular in shape, the first piston (13) is fixed on the inner cavity (B), the second piston (14) is circular in shape, and the second piston (14) is rotatably disposed on the inner cavity (B).

10. The hydraulic damper according to claim 9, characterized in that: It also includes a cover body (27), which is fixed to the top end of the cylinder body (1). The piston shaft (26) passes through the cover body (27) and extends out of the cylinder body (1). A sealing component is arranged below the cover body (27), and the sealing component is sleeved on the piston shaft (26). The upper and lower limit positions of the piston body move on the inner cavity (B).

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