High-strength damper

Abstract

The utility model discloses a high-strength damper, and relates to the technical field of dampers. The high-strength damper comprises a pipe assembly, a piston assembly, a piston rod, a first spring and a sealing piece, the piston assembly is movably arranged in an inner cavity of the pipe assembly, the first end of the piston rod is inserted into the inner cavity of the pipe assembly in a penetrating mode and connected with the piston assembly, and the first spring is arranged between the piston assembly and the end of the pipe assembly. The sealing piece is tightly sleeved on the piston rod and is in contact connection with an inner cavity of the pipe assembly; damping oil is injected between the inner cavity of the pipe assembly and the sealing piece; the piston assembly comprises a piston body, a piston shaft and a piston ring, the piston body is provided with a first oil passing channel and an oil return channel, the piston shaft is movably arranged in the first oil passing channel, and the piston ring is movably arranged in the oil return channel. According to the high-strength damper, the piston shaft is additionally arranged in the first oil passing channel, the flow of the first oil passing channel is reduced through the piston shaft, the oil passing amount of damping oil is reduced, then the damping force is improved, and high strength is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of dampers, and in particular to a high-force damper. Background Art

[0002] A liquid damper is a device that uses liquid flow to generate resistance. It has the functions of buffering, shock absorption, and noise reduction. It is widely used in mechanical engineering, automobile manufacturing and other fields.

[0003] The liquid damper is mainly composed of a tube assembly, a piston assembly, a piston rod, a spring, a sealing ring and other components. The piston assembly is movably arranged in the tube assembly, one end of the piston rod is inserted into the tube assembly and fixedly connected to the piston assembly, the spring is arranged between the piston body and the inner wall of the tube assembly, and the sealing ring is sleeved on the piston rod and has an interference fit with the inner wall of the tube assembly. Among them, the piston assembly has an oil passage and an oil return passage. When an external force is applied to the liquid damper, the piston assembly moves and compresses the spring, and the liquid flows from the first side of the piston assembly to the second side of the piston assembly through the oil passage, generating resistance during the flow of the liquid. When the external force on the liquid damper is removed, the piston assembly moves and resets under the action of the spring, and the liquid flows from the second side of the piston assembly to the first side of the piston assembly through the oil return passage, and the liquid damper returns to its initial state.

[0004] At present, most dampers use the gap between the piston assembly and the tube assembly to form an oil passage. However, when installing the piston assembly on the tube assembly, it is necessary to reserve an installation tolerance. Therefore, it is difficult to further reduce the oil passage on the outside of the piston assembly, resulting in the inability to further reduce the amount of oil flowing, thereby failing to increase the damping force of the damper. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a high-force damper.

[0006] The utility model discloses a high-force damper, comprising a tube assembly, a piston assembly, a piston rod, a first spring and a sealing member, wherein the piston assembly is movably arranged in the inner cavity of the tube assembly, the first end of the piston rod is inserted into the inner cavity of the tube assembly and connected to the piston assembly, the first spring is arranged between the piston assembly and the end of the tube assembly, the sealing member is tightly sleeved on the piston rod and is in contact with the inner cavity of the tube assembly, and damping oil is injected between the inner cavity of the tube assembly and the sealing member;

[0007] Among them, the piston assembly includes a piston body, a piston shaft and a piston ring. The piston body has a first oil passage and an oil return passage. The piston shaft is movably arranged in the first oil passage, and the piston ring is movably arranged in the oil return passage. The piston shaft is used to open or close the first oil passage, and the piston ring is used to open or close the oil return passage.

[0008] According to one embodiment of the utility model, the first oil passage includes a first oil passage level and a second oil passage level, the first oil passage level and the second oil passage level are interconnected, and the piston shaft is movably disposed in the first oil passage level.

[0009] According to one embodiment of the present invention, the inner diameter of the first oil-passing position gradually decreases from one end close to the second oil-passing position to one end far from the second oil-passing position, and the minimum inner diameter of the first oil-passing position is smaller than the minimum outer diameter of the piston shaft.

[0010] According to an embodiment of the utility model, the first oil-passing position adopts a channel structure, and the piston shaft adopts a columnar structure.

[0011] According to an embodiment of the present invention, the first oil overflow level is arranged through the second end portion and the connecting portion of the piston body, and the second oil overflow level is arranged on the first end portion of the piston body.

[0012] According to one embodiment of the utility model, the oil return channel includes a first oil return position and a second oil return position, the first oil return position and the second oil return position are interconnected, and the piston ring is movably arranged between the first oil return position and the second oil return position.

[0013] According to one embodiment of the utility model, the first oil return position is arranged on the side of the first end of the piston body, and the second oil return position is arranged on the side of the second end of the piston body. The first oil return position and the second oil return position are connected to each other through the gap between the first end and the second end.

[0014] According to an embodiment of the present utility model, the first oil return position and the second oil return position both adopt a groove-shaped structure.

[0015] According to an embodiment of the present utility model, the inner cavity of the pipe assembly is further provided with a second oil passage, and the second oil passage adopts a groove-shaped structure.

[0016] According to one embodiment of the present invention, the inner cavity of the tube assembly includes a first chamber and a second chamber, one end of the second oil passage extends to the junction of the first chamber and the second chamber, and the other end of the second oil passage extends to the middle position of the first chamber.

[0017] Compared with the prior art, the high-force damper of the utility model has the following advantages:

[0018] The high-force damper of the utility model increases a piston shaft in a first oil passage and uses the piston shaft to reduce the flow of the first oil passage to reduce the oil flow of the damping oil, thereby increasing the damping force and achieving high force.

[0019] In addition, the high-force damper of the utility model is also provided with a second oil passage, and the second oil passage is used to change the oil flow rate of different strokes to change the resistance, so that the damper has multiple damping forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 is a structural exploded view of a high force damper in an embodiment;

[0022] Figure 2 is a structural cross-sectional view of the high-force damper in the embodiment in the initial state;

[0023] Figure 3 for Figure 2 Enlarged view of area A in the middle;

[0024] Figure 4 The structure of the piston body in the embodiment is shown in FIG. Figure 1 ;

[0025] Figure 5 The structure of the piston body in the embodiment is shown in FIG. Figure 2 .

[0026] Description of reference numerals:

[0027] 100, pipe assembly; 110, pipe body; 111, first chamber; 112, second chamber; 113, protrusion; 114, second oil passage; 120, pipe cover; 200, piston assembly; 210, piston body; 211, first oil passage; 2111, first oil passage level; 2112, second oil passage level; 212, oil return passage; 2121, first oil return level; 2122, second oil return level; 2123, third oil return level; 213, first end; 2131, connecting position; 2132, arc surface; 214, second end; 2141, limiting part; 215, connecting part; 220, piston shaft; 230, piston ring; 300, piston rod; 310, blocking part; 400, first spring; 500, sealing element; 600, second spring; 700, blocking ring. DETAILED DESCRIPTION

[0028] The following will disclose multiple embodiments of the present invention with diagrams. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the diagram, some conventional structures and components will be depicted in a simple schematic manner in the diagram.

[0029] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] See also Figure 1 and 2 A high-force damper includes a tube assembly 100, a piston assembly 200, a piston rod 300, a first spring 400 and a seal 500. The piston assembly 200 is movably arranged in the inner cavity of the tube assembly 100. The first end of the piston rod 300 is inserted into the inner cavity of the tube assembly 100 and connected to the piston assembly 200. The first spring 400 is arranged between the piston assembly 200 and the end of the tube assembly 100. The seal 500 is tightly sleeved on the piston rod 300 and is in contact with the inner cavity of the tube assembly 100. Damping oil is injected between the inner cavity of the tube assembly 100 and the seal 500. When the piston assembly 200 moves, the damping oil is driven to flow in a directional manner between the two sides of the piston assembly 200. Among them, the seal 500 adopts a Y-shaped sealing ring, the outer lip of the seal 500 is interference fit with the inner cavity wall of the tube assembly 100, and the inner lip of the seal 500 is interference fit with the piston rod 300.

[0031] See also Figure 1 and 2 The tube assembly 100 includes a tube body 110 and a tube cover 120. The tube body 110 has an inner cavity, one end of the tube body 110 is a closed end, the other end of the tube body 110 is an open end, and the tube cover 120 is installed on the open end of the tube body 110 to close the open end. The tube body 110 and the tube cover 120 are both made of polyoxymethylene (POM).

[0032] Specifically, the inner cavity of the tube body 110 includes a first chamber 111 and a second chamber 112. The first chamber 111 and the second chamber 112 are connected to each other. The first chamber 111 is arranged near the closed end of the tube body 110, and the second chamber 112 is arranged near the open end of the tube body 110. A protrusion 113 is provided at the junction of the first chamber 111 and the second chamber 112, and the surface of the protrusion 113 smoothly transitions with the inner wall of the first chamber 111 and the inner wall of the second chamber 112. Among them, the inner diameter of the first chamber 111 is smaller than the inner diameter of the second chamber 112, and the inner diameter of the protrusion 113 is larger than the inner diameter of the first chamber 111 and smaller than the inner diameter of the second chamber 112.

[0033] See also Figures 1 to 5 , the piston assembly 200 is movably arranged in the first chamber 111, and the piston assembly 200 moves along the first chamber 111. The first end of the piston rod 300 passes through the pipe cover 120 and extends into the inner cavity of the tube body 110, and the first end of the piston rod 300 is fixedly connected to the piston assembly 200, and the second end of the piston rod 300 is exposed outside the tube assembly 100. The first spring 400 is arranged in the first chamber 111, and one end of the first spring 400 abuts against the closed end of the tube body 110, and the other end of the first spring 400 abuts against the piston assembly 200. The seal 500 is tightly sleeved on the piston rod 300 and is in contact with the inner wall of the second chamber 112, and damping oil is injected between the seal 500 and the closed end of the tube body 110. During assembly, after the piston assembly 200 enters the second chamber 112 through the open end of the tube body 110, an external force is applied to the piston assembly 200 so that the piston assembly 200 passes over the protrusion 113 and enters the first chamber 111; under the restriction of the protrusion 113, the movement stroke of the piston assembly 200 is limited to the first chamber 111.

[0034] Specifically, the piston assembly 200 includes a piston body 210, a piston shaft 220 and a piston ring 230. The piston body 210 has a first oil passage 211 and an oil return passage 212, and the first oil passage 211 and the oil return passage 212 are independent of each other. The piston shaft 220 is movably disposed in the first oil passage 211, and the piston shaft 220 is used to open or close the first oil passage 211. The piston ring 230 is movably disposed in the oil return passage 212, and the piston ring 230 is used to open or close the oil return passage 212. Among them, the piston body 210 is made of polyoxymethylene (POM).

[0035] Furthermore, the piston body 210 includes a first end 213, a second end 214 and a connecting portion 215. The first end 213 is close to the closed end of the tube body 110, and the second end 214 is close to the open end of the tube body 110. The connecting portion 215 is arranged between the first end 213 and the second end 214. The outer diameter of the first end 213 and the outer diameter of the second end 214 are both larger than the outer diameter of the connecting portion 215. The piston body 210 as a whole is shaped like an I-beam.

[0036] Among them, a connection position 2131 is provided on the end surface of the first end 213 away from the second end 214, and the first end of the piston rod 300 is plugged into the connection position 2131, and the first end of the piston rod 300 is interference fit with the connection position 2131 to ensure that the piston rod 300 is firmly connected to the piston body 210. The connection position 2131 adopts a hole-shaped structure, and the shape of the connection position 2131 is adapted to the shape of the first end of the piston rod 300. A limiting portion 2141 is provided on the end surface of the second end 214 away from the first end 213, and the limiting portion 2141 is plugged into one end of the first spring 400 to prevent the piston body 210 from separating from the first spring 400 and affecting the working performance of the damper. In this embodiment, the first end of the piston rod 300 adopts a cylindrical structure, the connection position 2131 adopts a circular hole structure, and the limiting portion 2141 is cylindrical.

[0037] Furthermore, the first oil-passing channel 211 includes a first oil-passing level 2111 and a second oil-passing level 2112. The first oil-passing level 2111 is arranged to pass through the connecting portion 215 and the second end portion 214, the second oil-passing level 2112 is arranged on the first end portion 213, and the second oil-passing level 2112 is arranged on the side of the connecting position 2131. The first oil-passing level 2111 and the second oil-passing level 2112 are interconnected through the connecting position 2131.

[0038] The first oil-passing position 2111 adopts a hole-shaped structure, the second oil-passing position 2112 adopts a groove-shaped structure, and the number of the second oil-passing position 2112 is at least one. In this embodiment, the first oil-passing position 2111 adopts a circular hole structure, the second oil-passing position 2112 adopts an L-shaped groove structure; the number of the second oil-passing positions 2112 is two, and the two second oil-passing positions 2112 are symmetrically arranged.

[0039] In order to ensure that the first oil level 2111 and the second oil level 2112 are connected to each other, a stopper 310 is provided on the first end of the piston rod 300. The stopper 310 is used to limit the insertion depth of the first end of the piston rod 300 and the connecting position 2131, so that there is always a gap between the first end of the piston rod 300 and the bottom of the connecting position 2131, and the first oil level 2111 and the second oil level 2112 are connected to each other through the gap.

[0040] Further, the piston shaft 220 is movably disposed in the first oil-passing level 2111, and the piston shaft 220 moves along the first oil-passing level 2111. The piston shaft 220 adopts a cylindrical structure, and the inner diameter of the first oil-passing level 2111 gradually decreases from the first end 213 to the second end 214, and the minimum inner diameter of the first oil-passing level 2111 is smaller than the outer diameter of the piston shaft 220. When one end of the piston shaft 220 close to the second end 214 reaches the position on the first oil-passing level 2111 where its inner diameter is the same as the outer diameter of the piston shaft 220, the piston shaft 220 blocks the first oil-passing level 2111, thereby realizing the closure of the first oil-passing channel 211.

[0041] In order to make the damper have multi-stage force, a second oil passage 114 is also provided on the inner wall of the first chamber 111. The second oil passage 114 adopts a groove structure, and the second oil passage 114 is arranged along the first chamber 111. One end of the second oil passage 114 extends to the protrusion 113, and the other end of the second oil passage 114 extends to the middle position of the first chamber 111. When the damper is applied with external force, the piston body 210 moves, and damping oil flows in both the first oil passage 211 and the second oil passage 114, with a certain resistance; and when the piston body 210 passes over the second oil passage 114, only the first oil passage 211 is left, the oil flow is reduced, and the resistance becomes larger.

[0042] Further, the oil return channel 212 includes a first oil return position 2121 and a second oil return position 2122, wherein the first oil return position 2121 is arranged on the side of the first end 213, and the second oil return position 2122 is arranged on the side of the second end 214, and the first oil return position 2121 and the second oil return position 2122 are connected to each other through the gap between the first end 213 and the second end 214. The first oil return position 2121 and the second oil return position 2122 both adopt a groove structure, and the first oil return position 2121 and the second oil return position 2122 are formed by the gap between the groove structure and the first chamber 111. In this embodiment, the number of the first oil return position 2121 and the second oil return position 2122 are both two, and the two first oil return positions 2121 are symmetrically arranged, and the two second oil return positions 2122 are symmetrically arranged.

[0043] In order to enable the damper to quickly return to its initial state without external force, the oil return channel 212 also includes a third oil return position 2123, which is used to increase the amount of oil return and reduce the resistance generated when the damping oil flows. Specifically, the third oil return position 2123 is arranged on the side of the first end 213, and the third oil return position 2123 is connected to the second oil return position 2122 through the gap between the first end 213 and the second end 214. In this embodiment, there are two third oil return positions 2123, and the two third oil return positions 2123 are symmetrically arranged; the third oil return position 2123 adopts a planar structure, and the third oil return position 2123 is formed by the gap between the planar structure and the first chamber 111.

[0044] Furthermore, the piston ring 230 is sleeved on the connecting portion 215, and the piston ring 230 moves between the first end portion 213 and the second end portion 214. The piston ring 230 is a circular sealing ring, and the inner diameter of the piston ring 230 is larger than the outer diameter of the connecting portion 215 to ensure that there is a gap between the first end portion 213 and the second end portion 214. The outer diameter of the piston ring 230 is larger than the outer diameter of the first end portion 213 and is not smaller than the inner diameter of the first chamber 111, and the depth of the first oil return position 2121 is smaller than the difference between the outer diameter and the inner diameter of the piston ring 230, so as to ensure that the piston ring 230 and the first end portion 213 can cover the first oil return position 2121 when they are pressed against each other, so as to close the oil return channel 212. Preferably, the end surface of the first end 213 facing the second end 214 is an arcuate surface 2132 to improve the fit between the first end 213 and the piston ring 230 when they are pressed against each other, ensuring that the oil return channel 212 can be completely closed.

[0045] See also Figure 1 and 2 A second spring 600 is also provided between the seal 500 and the tube cover 120 to relieve force, compensate for tolerance, reset, etc. Specifically, a retaining ring 700 is installed on the end surface of the seal 500 facing the open end of the tube body 110, one end of the second spring 600 presses against the retaining ring 700, and the other end of the second spring 600 presses against the tube cover 120.

[0046] For the sake of convenience, the area between the piston assembly 200 and the closed end of the tube body 110 is defined as the first oil side, and the area between the piston assembly 200 and the seal 500 is defined as the second oil side. The actuation process of the damper is described below:

[0047] In the initial state, the various components of the damper are relatively still, wherein the piston body 210 is adjacent to the protrusion 113, the piston ring 230 is adjacent to the second end 214, the seal 500 and the retaining ring 700 are adjacent to the protrusion 113, and the interior of the pipe assembly 100 is in oil pressure balance;

[0048] When an external force is applied to the piston rod 300, the piston body 210 is driven to move toward the closed end of the tube body 110, and the first spring 400 is compressed; during the movement of the piston body 210, the first end 213 approaches the piston ring 230, and when the first end 213 abuts against the piston ring 230, the first end 213 begins to push the piston ring 230, and the first end 213 and the piston ring 230 are continuously pressed against each other, and the piston ring 230 blocks the first oil return level 2121 and the third oil return level 2123 to close the oil return channel 212; synchronously, during the movement of the piston body 210, and under the action of the oil pressure, The piston shaft 220 moves toward the first end 213. At this time, a gap appears between the piston shaft 220 and the first oil-passing position 2111. The first oil-passing channel 211 is opened, and the damping oil on the first oil side flows to the second oil side through the first oil-passing channel 211. At the same time, the damping oil on the first oil side also flows to the second oil side through the second oil-passing channel 114. When the piston body 210 moves over the second oil-passing channel 114, the damping oil on the first oil side only flows to the second oil side through the first oil-passing channel 211. Synchronously, under the action of the oil pressure, the seal 500 and the retaining ring 700 move toward the open end of the pipe end, and the second spring 600 is compressed.

[0049] When the external force on the piston rod 300 is removed, under the action of the first spring 400, the piston body 210 moves toward the open end of the tube body 110; during the movement of the piston body 210, the second end 214 approaches the piston ring 230, and when the second end 214 abuts against the piston ring 230, it starts to push the piston ring 230, and the piston ring 230 no longer presses the first end 213, the first oil return level 2121 and the third oil return level 2123 are no longer blocked, and the oil return channel 2 12 is opened, and the damping oil on the second oil side flows to the first oil side through the return oil channel 212; synchronously, during the movement of the piston body 210, and under the action of the oil pressure, the piston shaft 220 moves toward the second end 214, at which time the piston shaft 220 cuts off the first oil level 2111, and the first oil channel 211 is closed; synchronously, under the action of the second spring 600, the seal 500 and the retaining ring 700 move toward the closed end of the pipe end; until the damper returns to its initial state.

[0050] In summary, the high-force damper increases the damping force and achieves high force by adding a piston shaft in the first oil passage and using the piston shaft to reduce the flow of the first oil passage to reduce the amount of damping oil flowing through the passage, thereby increasing the damping force. In addition, the high-force damper is also provided with a second oil passage, which is used to change the amount of oil flowing in different strokes to change the resistance, so that the damper has multiple damping forces.

[0051] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A high force damper, characterized in that: The invention comprises a pipe assembly (100), a piston assembly (200), a piston rod (300), a first spring (400) and a sealing member (500); the piston assembly (200) is movably arranged in the inner cavity of the pipe assembly (100); the first end of the piston rod (300) is inserted into the inner cavity of the pipe assembly (100) and connected to the piston assembly (200); the first spring (400) is arranged between the piston assembly (200) and the end of the pipe assembly (100); the sealing member (500) is tightly sleeved on the piston rod (300) and is in contact with and connected to the inner cavity of the pipe assembly (100); damping oil is injected between the inner cavity of the pipe assembly (100) and the sealing member (500); The piston assembly (200) comprises a piston body (210), a piston shaft (220) and a piston ring (230); the piston body (210) has a first oil passage (211) and an oil return passage (212); the piston shaft (220) is movably arranged in the first oil passage (211); the piston ring (230) is movably arranged in the oil return passage (212); the piston shaft (220) is used to open or close the first oil passage (211); and the piston ring (230) is used to open or close the oil return passage (212).

2. The high force damper according to claim 1, characterized in that: The first oil passage (211) comprises a first oil passage level (2111) and a second oil passage level (2112); the first oil passage level (2111) and the second oil passage level (2112) are connected to each other, and the piston shaft (220) is movably disposed in the first oil passage level (2111).

3. The high force damper according to claim 2, characterized in that: The inner diameter of the first oil-passing level (2111) gradually decreases from an end close to the second oil-passing level (2112) to an end far from the second oil-passing level (2112), and the minimum inner diameter of the first oil-passing level (2111) is smaller than the minimum outer diameter of the piston shaft (220).

4. The high force damper according to claim 3, characterized in that: The first oil-passing position (2111) adopts a channel structure, and the piston shaft (220) adopts a columnar structure.

5. The high force damper according to claim 2, characterized in that: The first oil overflow level (2111) is arranged to pass through the second end (214) and the connecting portion (215) of the piston body (210), and the second oil overflow level (2112) is arranged on the first end (213) of the piston body (210).

6. The high force damper according to claim 1, characterized in that: The oil return channel (212) comprises a first oil return position (2121) and a second oil return position (2122); the first oil return position (2121) and the second oil return position (2122) are connected to each other; and the piston ring (230) is movably arranged between the first oil return position (2121) and the second oil return position (2122).

7. The high force damper according to claim 6, characterized in that: The first oil return position (2121) is arranged on the side of the first end (213) of the piston body (210), and the second oil return position (2122) is arranged on the side of the second end (214) of the piston body (210). The first oil return position (2121) and the second oil return position (2122) are connected to each other through a gap between the first end (213) and the second end (214).

8. The high force damper according to claim 7, characterized in that: The first oil return position (2121) and the second oil return position (2122) both adopt a groove-shaped structure.

9. The high force damper according to claim 1, characterized in that: The inner cavity of the pipe assembly (100) is also provided with a second oil passage (114), and the second oil passage (114) adopts a groove-shaped structure.

10. The high force damper according to claim 9, characterized in that: The inner cavity of the pipe assembly (100) comprises a first chamber (111) and a second chamber (112); one end of the second oil passage (114) extends to the junction of the first chamber (111) and the second chamber (112); and the other end of the second oil passage (114) extends to the middle position of the first chamber (111).

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