Two-way damper

Abstract

The present invention discloses a bidirectional damper, comprising a cylinder, a plug and a guide sleeve are respectively arranged at both ends of the cylinder, a piston rod with one end extending out of the guide sleeve is arranged in the cylinder, a piston is fixedly connected to the piston rod, a floating piston is also arranged between the plug and the piston in the cylinder, a first damping channel is arranged between the outer wall of the piston and the inner wall of the cylinder, a connecting channel connecting the second chamber and the third chamber is arranged in the piston body, a sealing groove connecting the first damping channel and the connecting channel is also arranged on the outer wall of the piston, a sealing ring which is slidably arranged in the sealing groove and is sealed with the inner wall of the cylinder; a positioning sleeve, a spring and a sealing member are arranged in sequence at one end of the piston rod located in the cylinder. The present invention can realize bidirectional damping motion, and can realize self-locking at any position, has a simple structure, and is easy to assemble and manufacture.

Description

Technical Field

[0001] The invention belongs to the technical field of dampers, and in particular relates to a bidirectional damper which can self-lock at any position. Background Art

[0002] Gas spring is a common damper, which is widely used in actuators that can support, buffer, adjust height and adjust angle. It is mainly composed of a cylinder, a piston, a piston rod, a guide sleeve and fillers such as inert gas or damping oil filled in a steel sleeve. With the advancement of science and technology, a two-way damper with a piston rod that can be self-locked at any position of the cylinder is needed in many gas spring application fields. For example, an electrically driven damping rod used in a car trunk, the cylinder of this damper is connected to the body (carrier), the piston rod is connected to the trunk door cover (load), the trunk door cover and the body are driven by a motor to open and close, and the trunk door cover is required to stop at any position. Usually, when this damper is locked at any position, it can only be locked in one direction, and the other direction needs to be locked with the help of the external force of the load. There are few gas-liquid dampers that can achieve two-way locking at any position in the prior art. Even if it can achieve two-way locking at any position, the damping force of the piston rod position is relatively small, and the structure is complex and difficult to manufacture. Summary of the invention

[0003] In view of the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a bidirectional damper, whose piston rod can realize bidirectional damping movement under the action of external force, and the bidirectional damping force is relatively large. After the external force acting on the piston rod is eliminated, it can realize self-locking at any position of the cylinder barrel, and the structure is simple and easy to assemble and manufacture.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is.

[0005] A two-way damper comprises a cylinder, a plug is provided at one end of the cylinder, a guide sleeve is provided at the other end, a piston rod is provided in the cylinder with one end extending out of the guide sleeve, a piston is fixedly connected to the piston at one end of the piston rod located in the cylinder, a floating piston is also provided in the cylinder between the plug and the piston, a first chamber is formed in the cylinder between the plug and the floating piston, the first chamber is filled with inert gas, a second chamber is formed in the cylinder between the floating piston and the piston, a third chamber is formed in the cylinder between the piston and the guide sleeve, the second chamber and the third chamber are filled with hydraulic oil; a first damping channel is provided between the outer wall of the piston and the inner wall of the cylinder, and the piston itself A connecting channel connecting the second chamber and the third chamber is arranged in the body, and a sealing groove connecting the first damping channel and the connecting channel is also arranged on the outer wall of the piston, and a sealing ring which is sealingly matched with the inner wall of the cylinder is slidably arranged in the sealing groove, and the sealing ring is used to penetrate or block the connection between the first damping channel and the connecting channel; a positioning sleeve, a spring and a sealing member are arranged in sequence at one end of the piston rod located in the cylinder, and the two ends of the spring are respectively against the positioning sleeve and the sealing member, and the sealing member is tightly against the piston under the elastic force of the spring, and a second damping channel is formed between the sealing member and the piston, and the sealing member is used to penetrate or block the connection between the second damping channel and the connecting channel;

[0006] When there is no external force acting on the piston rod, the sealing ring slides to the first side of the sealing groove under the action of the gas pressure in the first chamber to block the connection between the first damping channel and the connecting channel. At the same time, the sealing member tightly abuts against the piston under the action of the spring to block the connection between the second damping channel and the connecting channel. At this time, the second chamber and the third chamber are in a blocking state, and the piston rod is locked in the current position; when an external force acts on the piston rod to retract into the cylinder, the sealing ring slides to the second side of the sealing groove under the action of the external force to connect the first damping channel with the connecting channel. At the same time, the sealing member tightly abuts against the piston under the action of the spring to block the connection between the second damping channel and the connecting channel. The connecting channel is connected, at this time, the second chamber is connected with the third chamber through the first damping channel and the connecting channel, and the piston rod overcomes the gas pressure of the first chamber and contracts toward the cylinder; when an external force acts on the piston rod to extend out of the cylinder, the sealing ring slides to the first side of the sealing groove under the action of the external force to block the connection between the first damping channel and the connecting channel. At the same time, the sealing element overcomes the elastic force of the spring and moves toward the second chamber side under the pressure of the hydraulic oil in the third chamber to connect the second damping channel with the connecting channel. At this time, the second chamber is connected with the third chamber through the second damping channel and the connecting channel, and the piston rod overcomes the elastic force of the spring and extends out of the cylinder.

[0007] Preferably, a first step portion is provided on one side of the piston rod located in the cylinder barrel, the piston is provided with an axial hole adapted to the first step portion, the piston rod is further provided with a riveting process groove, and the piston is riveted in the riveting process groove and fixedly connected to the piston rod. Further, a second step portion adjacent to the first step portion is provided on one side of the piston rod located in the cylinder barrel, the diameter of the second step portion is smaller than the diameter of the first step portion, and a threaded connection portion is further provided at the end of the second step portion, and the threaded connection portion is connected to a nut that abuts against the positioning sleeve. When the positioning sleeve pre-compresses the spring under the limiting action of the nut, the nut and the end of the second step portion are riveted together. Further, a connection portion that seals with the inner wall of the seal is further provided on the piston rod between the first step portion and the second step portion.

[0008] Preferably, a sealing ring cooperating with the piston rod is arranged between the piston and the guide sleeve in the cylinder. Further, a limiting protrusion is arranged on the inner wall of the cylinder between the piston and the sealing ring.

[0009] Preferably, the end surface of the piston facing the second chamber is provided with a first blind hole, the end surface of the piston facing the third chamber is provided with a second blind hole, the bottom of the first blind hole intersects and penetrates the bottom of the second blind hole to form the connecting channel. Further, the sealing grooves are two arranged side by side, the two sealing grooves are arranged on the outer wall of the piston corresponding to the second blind hole, and the sealing groove is connected to the second blind hole.

[0010] Preferably, the plug is connected to a sealing head, the plug is provided with a wedge-shaped hole, and the sealing head is provided with a wedge nail welded to the wedge-shaped hole.

[0011] After adopting the above technical scheme, the advantages of the present invention compared with the prior art are:

[0012] The bidirectional damper described in the present invention controls the first damping channel by a sealing ring slidingly arranged in a sealing groove on the outer wall of the piston, and controls the second damping channel by a sealing member compressed by a spring on the end face of the piston. When the piston rod is not acted upon by an external force, the first damping channel and the second damping channel cause the second chamber and the third chamber to be in a completely blocked state, thereby enabling the piston rod to be locked in the current position of the cylinder barrel; when the piston rod is contracted by an external force, the second damping channel is blocked from the connecting channel, but the sealing ring slides under force and connects the first damping channel with the connecting channel, thereby allowing the hydraulic oil in the second chamber to flow out from the first damping channel. and the connecting channel enters the third chamber, thereby generating a damping force, so that the piston rod overcomes the gas pressure of the first chamber and contracts toward the cylinder barrel; when the piston rod is extended by an external force, the sealing ring is forced to slide and block the first damping channel and the connecting channel. At this time, the pressure of the hydraulic oil in the third chamber acts on the seal from the connecting channel, so that the seal overcomes the elastic force of the spring and moves toward the second chamber side to connect the second damping channel with the connecting channel, thereby allowing the hydraulic oil in the third chamber to enter the second chamber from the connecting channel and the second damping channel, thereby generating a damping force, so that the piston rod overcomes the elastic force of the spring and extends out of the cylinder barrel. Compared with the prior art, the piston rod can realize bidirectional damping movement under the action of an external force, and the bidirectional damping force is relatively large. It can also be adjusted according to actual use requirements during manufacturing. When the external force acting on the piston rod is eliminated, the piston rod can be self-locked at any position of the cylinder barrel, and the locking damping force is also relatively large. In addition, the present invention has a simple structure and is easy to assemble and manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a partial enlarged structural schematic diagram of the present invention.

[0016] In the figure, 1. cylinder barrel, 2. plug, 3. guide sleeve, 4. piston rod, 5. piston, 6. floating piston, 7. positioning sleeve, 8. spring, 9. seal, 10. sealing ring, 11. nut, 12. sealing ring, 13. limiting protrusion, 14. head, 15. wedge, 16. first step portion, 17. second step portion, 18. connecting portion, 19. first chamber, 20. second chamber, 21. third chamber, 22. first damping channel, 23. connecting channel, 24. sealing groove, 25. first blind hole, 26. second blind hole, 27. riveting process groove, 28. second damping channel. DETAILED DESCRIPTION

[0017] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

[0018] See also Figure 1 and Figure 2 A two-way damper comprises a cylinder 1, a plug 2 is provided at one end of the cylinder 1, and a guide sleeve 3 is provided at the other end. In this embodiment, one end of the cylinder 1 is bent and abutted against the guide sleeve 3, so as to limit the position of the guide sleeve 3 in the cylinder 1. The plug 2 at the other end of the cylinder 1 is also connected to a head 14, and the plug 2 is provided with a wedge-shaped hole. The head 14 is provided with a wedge nail 15 welded to the wedge-shaped hole. When the components and hydraulic oil in the cylinder 1 are filled, the cylinder 1 inserts the wedge nail 15 of the head 14 into the wedge-shaped hole of the plug 2 under the pressurized condition of inert gas and is welded together to complete the packaging of the damper.

[0019] A piston rod 4 is arranged in the cylinder 1, one end of which extends out of the guide sleeve 3. A piston 5 is fixedly connected to one end of the piston rod 4 located in the cylinder 1. A floating piston 6 is also arranged in the cylinder 1 between the plug 2 and the piston 5. A first chamber 19 is formed in the cylinder 1 between the plug 2 and the floating piston 6, and the first chamber 19 is filled with inert gas. A second chamber 20 is formed in the cylinder 1 between the floating piston 6 and the piston 5. A third chamber 21 is formed in the cylinder 1 between the piston 5 and the guide sleeve 3. The second chamber 20 and the third chamber 21 are filled with hydraulic oil. The floating piston 6 is used to separate the gas-filled and liquid-filled chambers in the cylinder 1. An O-ring is arranged on the outer peripheral wall of the floating piston 6 to seal with the inner wall of the cylinder 1. The first chamber 19 is filled with pressurized nitrogen. The compressible characteristics of the gas are used to transmit its pressure to the piston 5 and the piston rod 4 through the hydraulic oil in the second chamber 20. The hydraulic oil flows between the second chamber 20 and the third chamber 21 so that the piston 5 and the piston rod 4 can be extended and retracted relative to the cylinder 1. In the present embodiment, a sealing ring 12 cooperating with the piston rod 4 is provided in the cylinder 1 between the piston 5 and the guide sleeve 3. The sealing ring 12 adopts a two-stage L-shaped sealing ring and is used to seal the guide sleeve 3 end of the piston rod 4. A limiting protrusion 13 is provided on the inner wall of the cylinder 1 between the piston 5 and the sealing ring 12, which is used to position the L-shaped sealing ring 12 and also to limit the extension stroke of the piston 5.

[0020] A first damping channel 22 is provided between the outer wall of the piston 5 and the inner wall of the cylinder 1. The first damping channel 22 is formed by the gap between the outer wall of the piston 5 and the inner wall of the cylinder 1. A connecting channel 23 connecting the second chamber 20 and the third chamber 21 is provided in the body of the piston 5. A sealing groove 24 connecting the first damping channel 22 and the connecting channel 23 is also provided on the outer wall of the piston 5. A sealing ring 10 that seals with the inner wall of the cylinder 1 is slidably provided in the sealing groove 24. The sealing ring 10 is used to penetrate or block the communication between the first damping channel 22 and the connecting channel 23. In this embodiment, a first blind hole 25 is provided on the end face of the piston 5 facing the second chamber 20, and a second blind hole 26 is provided on the end face of the piston 5 facing the third chamber 21. The bottom of the first blind hole 25 intersects and penetrates with the bottom of the second blind hole 26 to form the connecting channel 23. Furthermore, there are two sealing grooves 24 arranged side by side, and the two sealing grooves 24 are arranged on the outer wall of the piston 5 corresponding to the second blind hole 26 , and the sealing groove 24 is communicated with the second blind hole 26 .

[0021] The end of the piston rod 4 located in the cylinder 1 is provided with a positioning sleeve 7, a spring 8 and a sealing member 9 in sequence, and the two ends of the spring 8 are respectively against the positioning sleeve 7 and the sealing member 9, and the sealing member 9 is tightly against the piston 5 under the elastic force of the spring 8, and a second damping channel 28 is formed between the sealing member 9 and the piston 5, and the sealing member 9 is used to penetrate or block the communication between the second damping channel 28 and the connecting channel 23. The sealing member 9 is a flexible rubber member with an annular gasket embedded therein. In this embodiment, the side of the piston rod 4 located in the cylinder 1 is provided with a first step portion 16, and the piston 5 is provided with an axial hole adapted to the first step portion 16. The piston rod 4 is also provided with a riveting process groove 27, and the piston 5 is riveted in the riveting process groove 27 to be fixedly connected with the piston rod 4. The piston 5 is formed in one piece, the axial hole of the piston 5 is inserted into the first step portion 16 of the piston rod 4, and the outer wall of the piston 5 is riveted to the pressing process groove 27. This fixed connection method between the piston 5 and the piston rod 4 can make the cylinder 1, the piston rod 4, the piston 5 and the guide sleeve 3 have better concentric processing accuracy, especially the concentric assembly accuracy requirements of the piston 5 and the piston rod 4 are lower, and it is easy to process and assemble.

[0022] Furthermore, the piston rod 4 is provided with a second step portion 17 adjacent to the first step portion 16 on one side of the cylinder 1, the diameter of the second step portion 17 is smaller than the diameter of the first step portion 16, and the end of the second step portion 17 is provided with a threaded connection portion, which is connected with a nut 11 that abuts against the positioning sleeve 7. When the positioning sleeve 7 pre-compresses the spring 8 under the limiting action of the nut 11, the nut 11 and the end of the second step portion 17 are riveted and connected together. Furthermore, the piston rod 4 is provided with a connection portion 18 that seals with the inner wall of the sealing member 9 between the first step portion 16 and the second step portion 17. Under the elastic action of the spring 8, the end face of the sealing member 9 is tightly abutted against the opening of the connecting channel 23 of the piston 5 toward the second chamber 20, and the inner annular surface thereof is sealed with the connection portion 18 of the piston rod 4, which has a better sealing effect.

[0023] The working principle and process of the present invention are as follows.

[0024] When no external force acts on the piston rod 4, the sealing ring 10 slides to the first side (the left side in the figure) of the sealing groove 24 under the action of the gas pressure in the first chamber 19 to block the connection between the first damping channel 22 and the connecting channel 23. At the same time, the sealing member 9 is tightly pressed against the piston 5 under the action of the spring 8 to block the connection between the second damping channel 28 and the connecting channel 23. At this time, the second chamber 20 and the third chamber 21 are in a blocking state, and the piston rod 4 is locked in the current position.

[0025] When external force acts on the piston rod 4 to retract into the cylinder 1, the sealing ring 10 slides to the second side of the sealing groove 24 (the right side in the figure) under the action of the external force to connect the first damping channel 22 with the connecting channel 23. At the same time, the sealing member 9 is tightly pressed against the piston 5 under the action of the spring 8 to block the connection between the second damping channel 28 and the connecting channel 23. At this time, the second chamber 20 is connected with the third chamber 21 through the first damping channel 22 and the connecting channel 23, and the piston rod 4 overcomes the gas pressure of the first chamber 19 and retracts toward the cylinder 1.

[0026] When external force acts on the piston rod 4 to extend out of the cylinder 1, the sealing ring 10 slides to the first side of the sealing groove 24 under the action of the external force to block the connection between the first damping channel 22 and the connecting channel 23. At the same time, the sealing member 9 overcomes the elastic force of the spring 8 and moves toward the second chamber 20 under the pressure of the hydraulic oil in the third chamber 21 to connect the second damping channel 28 with the connecting channel 23. At this time, the second chamber 20 is connected with the third chamber 21 through the second damping channel 28 and the connecting channel 23, and the piston rod 4 overcomes the elastic force of the spring 8 and extends out of the cylinder 1.

[0027] In summary, the piston rod 4 of the present invention can realize bidirectional damping motion under the action of external force, and the bidirectional damping force is relatively large, and the bidirectional damping force can be adjusted according to actual use requirements during manufacturing. When the external force acting on the piston rod 4 is eliminated, the piston rod 4 can realize self-locking at any position of the cylinder 1, and the locking damping force is also relatively large. In addition, the present invention has a simple structure and is easy to assemble and manufacture.

[0028] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A bidirectional damper, comprising a cylinder (1), wherein a plug (2) is provided at one end of the cylinder (1), and a guide sleeve (3) is provided at the other end thereof, a piston rod (4) is provided in the cylinder (1) and one end thereof extends out of the guide sleeve (3), one end of the piston rod (4) located in the cylinder (1) is fixedly connected to a piston (5), a floating piston (6) is further provided in the cylinder (1) between the plug (2) and the piston (5), a first chamber (19) is formed in the cylinder (1) between the plug (2) and the floating piston (6), and the first chamber (19) is filled with an inert gas, a second chamber (20) is formed in the cylinder (1) between the floating piston (6) and the piston (5), a third chamber (21) is formed in the cylinder (1) between the piston (5) and the guide sleeve (3), and the second chamber (20) and the third chamber (21) are filled with hydraulic oil, characterized in that: A first damping channel (22) is provided between the outer wall of the piston (5) and the inner wall of the cylinder (1); a connecting channel (23) communicating with the second chamber (20) and the third chamber (21) is provided in the piston (5) body; a sealing groove (24) communicating with the first damping channel (22) and the connecting channel (23) is also provided on the outer wall of the piston (5); a sealing ring (10) is slidably provided in the sealing groove (24) and is in sealing engagement with the inner wall of the cylinder (1); the sealing ring (10) is used to penetrate or block the communication between the first damping channel (22) and the connecting channel (23); One end of the piston rod (4) located in the cylinder (1) is provided with a positioning sleeve (7), a spring (8) and a sealing member (9) in sequence, the two ends of the spring (8) respectively abut against the positioning sleeve (7) and the sealing member (9), the sealing member (9) tightly abuts against the piston (5) under the elastic force of the spring (8), a second damping channel (28) is formed between the sealing member (9) and the piston (5), and the sealing member (9) is used to penetrate or block the communication between the second damping channel (28) and the connecting channel (23); When no external force acts on the piston rod (4), the sealing ring (10) slides to the first side of the sealing groove (24) under the action of the gas pressure in the first chamber (19) to block the communication between the first damping channel (22) and the connecting channel (23). At the same time, the sealing member (9) is tightly pressed against the piston (5) under the action of the spring (8) to block the communication between the second damping channel (28) and the connecting channel (23). At this time, the second chamber (20) and the third chamber (21) are in a blocking state, and the piston rod (4) is locked in the current position. When an external force acts on the piston rod (4) to shrink into the cylinder (1), the sealing ring (10) slides to the second side of the sealing groove (24) under the action of the external force to connect the first damping channel (22) with the connecting channel (23). At the same time, the sealing member (9) is tightly pressed against the piston (5) under the action of the spring (8) to block the connection between the second damping channel (28) and the connecting channel (23). At this time, the second chamber (20) is connected to the third chamber (21) through the first damping channel (22) and the connecting channel (23), and the piston rod (4) overcomes the gas pressure of the first chamber (19) and shrinks toward the cylinder (1); When an external force acts on the piston rod (4) to extend out of the cylinder barrel (1), the sealing ring (10) slides to the first side of the sealing groove (24) under the action of the external force to block the connection between the first damping channel (22) and the connecting channel (23). At the same time, the sealing member (9) overcomes the elastic force of the spring (8) under the pressure of the hydraulic oil in the third chamber (21) and moves toward the second chamber (20) to connect the second damping channel (28) with the connecting channel (23). At this time, the second chamber (20) is connected to the third chamber (21) through the second damping channel (28) and the connecting channel (23), and the piston rod (4) overcomes the elastic force of the spring (8) and extends out of the cylinder barrel (1).

2. The bidirectional damper according to claim 1, characterized in that: A first step portion (16) is provided on one side of the piston rod (4) located in the cylinder barrel (1), and the piston (5) is provided with an axial hole adapted to the first step portion (16). The piston rod (4) is also provided with a riveting process groove (27), and the piston (5) is riveted in the riveting process groove (27) to be fixedly connected to the piston rod (4).

3. The bidirectional damper according to claim 2, characterized in that: A second step portion (17) adjacent to the first step portion (16) is also provided on one side of the piston rod (4) located in the cylinder barrel (1); the diameter of the second step portion (17) is smaller than the diameter of the first step portion (16); a threaded connection portion is also provided at the end of the second step portion (17); the threaded connection portion is connected to a nut (11) that abuts against the positioning sleeve (7).

4. The bidirectional damper according to claim 3, characterized in that: After the positioning sleeve (7) pre-compresses the spring (8) under the limiting action of the nut (11), the nut (11) and the end of the second step portion (17) are riveted together.

5. The bidirectional damper according to claim 1, characterized in that: A sealing ring (12) cooperating with the piston rod (4) is provided in the cylinder (1) between the piston (5) and the guide sleeve (3).

6. The bidirectional damper according to claim 5, characterized in that: A limiting protrusion (13) is provided on the inner wall of the cylinder (1) between the piston (5) and the sealing ring (12).

7. The bidirectional damper according to claim 1, characterized in that: The end surface of the piston (5) facing the second chamber (20) is provided with a first blind hole (25), and the end surface of the piston (5) facing the third chamber (21) is provided with a second blind hole (26), and the bottom of the first blind hole (25) and the bottom of the second blind hole (26) intersect and penetrate to form the connecting channel (23).

8. The bidirectional damper according to claim 7, characterized in that: There are two sealing grooves (24) arranged side by side, and the two sealing grooves (24) are arranged on the outer wall of the piston (5) corresponding to the second blind hole (26), and the sealing groove (24) is communicated with the second blind hole (26).

9. The bidirectional damper according to claim 3, characterized in that: The piston rod (4) is also provided with a connecting portion (18) between the first step portion (16) and the second step portion (17) and is seal-matched with the inner wall of the sealing member (9).

10. The bidirectional damper according to claim 1, characterized in that: The plug (2) is connected to a sealing head (14), the plug (2) is provided with a wedge-shaped hole, and the sealing head (14) is provided with a wedge nail (15) welded to the wedge-shaped hole.

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