Idle-stroke-free damper

Abstract

The utility model discloses an idle-stroke-free damper which comprises an inner cylinder and an outer cylinder sleeved outside the inner cylinder, a piston driven by a piston rod is arranged in the inner cylinder, the outer cylinder is divided into an inner cavity and an outer cavity by the inner cylinder, the piston rod is respectively matched with the inner cylinder and the outer cylinder through a guide sleeve, and a flow channel communicated with the inner cavity and the outer cavity is arranged on the guide sleeve. A volume compensation piece is arranged in the outer cavity, a circulation hole is formed in the piston, one end of the piston is sleeved with a valve block in a sliding mode, and a throttling hole is formed between the valve block and the piston. According to the scheme, when the damper is pulled or pressed, the transmission supporting requirement of one-way large damping is met; after the volume compensation piece is compressed, resilience force is utilized, so that the oil supplementing speed is higher, idle stroke is avoided, damping is stable, accessories are universal, the market is easy to purchase, the batch cost is low, and the service life is greatly prolonged by adopting a guide sleeve and a sealing ring; and the one-way large-damping transmission supporting requirement can be met.

Description

Technical Field

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

[0002] A damper is a device used to provide resistance to movement and dissipate the energy of movement. Using dampers to absorb energy and reduce shock is widely used in aerospace, aviation, military, guns, automobiles and other industries.

[0003] The existing damper includes a cylinder, a piston disposed in the cylinder, and a piston rod driving the piston. The piston rod has a large damping effect when it is pulled out or compressed, and the damping magnitude is equal when the damper is pulled and compressed. In many use cases, the characteristics of such a damper are single and the layout is not reasonable. When the use case requires small return resistance and fast return speed or small compression resistance and fast compression speed, the traditional damper cannot meet the transmission support requirements of unidirectional large damping.

[0004] For example, Chinese patent publication number CN113187841A, publication date July 30, 2021, named "A two-way self-locking damper", includes a cylinder body, a piston assembly accommodated in the cylinder body and displaceable along the axial direction of the cylinder body, the piston assembly includes a piston rod, a piston and a two-way self-locking valve, the two-way self-locking valve includes a valve body and a locking assembly, the valve body is provided with a flow chamber and a first flow channel and a second flow channel connected to the flow chamber, the first flow channel is connected to the restoration pressure chamber, and the second flow channel is connected to the compression pressure chamber; wherein, the locking assembly can be guided to displace in the flow chamber under the drive of the working medium, and is used to open / cut off the connection between the first flow channel or the second flow channel and the flow chamber. When the connection between the first flow channel / the second flow channel and the flow chamber is cut off, the connection between the restoration pressure chamber and the compression pressure chamber is cut off, thereby suppressing the displacement of the piston rod to generate a huge damping force, and producing a better limiting effect on the external load.

[0005] The disadvantage of the existing patent is that the damping magnitude of the existing damper is equal when it is under tension and compression, and it cannot meet the transmission support requirements of unidirectional large damping. Utility Model Content

[0006] The purpose of the utility model is to solve the problem that the existing damper has equal damping magnitude when subjected to tension and compression and cannot meet the transmission support requirements of unidirectional large damping, and to provide a zero-backlash damper that can meet the transmission support requirements of unidirectional large damping.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A zero-backlash damper includes an inner cylinder and an outer cylinder sleeved outside the inner cylinder, a piston driven by a piston rod is arranged in the inner cylinder, the inner cylinder divides the outer cylinder into an inner cavity and an outer cavity, the piston rod cooperates with the inner cylinder and the outer cylinder respectively through a guide sleeve, a flow channel connecting the inner cavity and the outer cavity is arranged on the guide sleeve, a volume compensation part is arranged in the outer cavity, a flow hole is arranged on the piston, a valve plate is arranged on one end of the piston sliding sleeve, and a throttle hole is formed between the valve plate and the piston. A zero-backlash damper described in this scheme, by arranging a valve plate at the end of the piston and forming a throttle hole between the valve plate and the piston, the damper generates a transmission support requirement of one-way large damping when it is pulled or compressed. When the damper is compressed, the oil in the rodless cavity of the inner cylinder enters the rod cavity of the inner cylinder, and the oil in the rod cavity of the inner cylinder enters the outer cavity, and compresses the volume compensation part to provide volume for the oil; when the damper is pulled, the volume compensation part is restored, and the oil in the outer cavity enters the inner cylinder. The one-way damping of the damper is adjusted by the valve plate set at one end of the piston. The valve plate has two states: open and pressed on the piston, so that the damper can meet the transmission support requirements of one-way large damping. At the same time, the rebound force of the volume compensation part is used to make the oil replenishment speed faster. It has the advantages of no empty travel, stable damping, universal accessories, easy purchase in the market, and low batch cost.

[0009] The guide sleeve is formed in one step and can be directly manufactured, thereby omitting other processes such as inner cylinder hole opening, and also reducing the cost of the guide sleeve.

[0010] Preferably, the volume compensating member is an airbag, and the airbag is located in the outer cavity. The volume compensating member is an airbag in a natural state, and the airbag is provided with air in the bag, so that the pressure inside the bag is consistent with the pressure outside the bag. At this time, the compression and recovery of the airbag have little effect on the damping and can be ignored, that is, the power provided to the oil by the airbag during recovery can be ignored, and only the effect of providing volume to the oil during compression of the airbag is considered. One-way large damping is achieved by a valve sheet that cooperates with the piston.

[0011] When the valve plate is located at one end of the piston facing the guide sleeve, when the damper is under pressure, the oil in the rodless chamber of the inner cylinder reopens the valve plate and enters the rod chamber of the inner cylinder. The oil in the rod chamber of the inner cylinder enters the outer chamber through the flow channel of the guide sleeve and compresses the airbag to provide volume for the oil. At this time, the damping generated by the airbag is very small and can be ignored. When the damper is pulled, the oil in the rod chamber of the inner cylinder enters the rodless chamber of the inner cylinder through the throttling hole and the flow hole. At this time, the oil presses the valve plate against the piston, and the oil in the outer cylinder enters the inner chamber through the flow channel of the guide sleeve, and the airbag recovers. The damper has small damping when it is under pressure and large damping when it is pulled. The small damping can be ignored, and the large damping can be controlled by the valve plate, which can meet the transmission support requirements of unidirectional large damping.

[0012] When the valve plate is located at the end of the piston away from the guide sleeve, when the damper is under pressure, the oil in the rodless chamber of the inner cylinder enters the rod chamber of the inner cylinder through the throttling hole and the flow hole. At this time, the oil presses the valve plate against the piston, and the oil in the rod chamber of the inner cylinder enters the outer chamber through the flow channel of the guide sleeve, and compresses the airbag to provide volume for the oil. At this time, the damping generated by the airbag is very small and can be ignored. The valve plate is mainly used to form large damping; When the damper is pulled, the oil in the rod chamber of the inner cylinder breaks the valve plate and enters the rodless chamber of the inner cylinder. The oil in the outer cylinder enters the inner chamber through the flow channel of the guide sleeve, and the airbag recovers. The damper has large damping when it is under pressure and no damping when it is pulled. The large damping can be controlled by the valve plate, which can meet the transmission support requirements of unidirectional large damping.

[0013] Preferably, the airbag is filled with high-pressure air or high-pressure inert gas, and the valve plate is located at the end of the piston away from the guide sleeve. When the valve plate is located at the end of the piston away from the guide sleeve, when the damper is under pressure, the oil in the rodless chamber of the inner cylinder enters the rod chamber of the inner cylinder through the throttling hole and the flow hole. At this time, the oil presses the valve plate against the piston, and the oil in the rod chamber of the inner cylinder enters the outer chamber through the flow channel of the guide sleeve, and compresses the airbag to provide volume for the oil. The airbag generates damping during the compression of the damper; when the damper is pulled, the oil in the rod chamber of the inner cylinder breaks the valve plate and enters the rodless chamber of the inner cylinder, and the airbag restores the oil in the outer cylinder to enter the inner chamber through the flow channel of the guide sleeve to provide power. The damper has large damping when it is under pressure and no damping when it is pulled. The large damping is generated by the valve plate and the airbag, which can meet the transmission support requirements of unidirectional large damping.

[0014] Preferably, the volume compensating member is a foam rubber, and the foam rubber is located in the outer cavity. The effect of the foam rubber is consistent with that of the airbag in a natural state. At this time, the compression and rebound of the foam rubber have little effect on damping and can be ignored, that is, the power provided to the oil by the foam rubber during rebound can be ignored, and only the effect of providing volume to the oil during compression of the foam rubber is considered. One-way large damping is achieved by a valve sheet that cooperates with the piston.

[0015] Preferably, the throttle hole comprises a groove arranged at the end of the piston, the groove and the valve plate form a throttle hole, the throttle hole passes through the outer side of the valve plate and the flow hole, and the cross-sectional area of ​​the throttle hole is smaller than the cross-sectional area of ​​the flow channel hole. When the oil presses the valve plate against the end of the piston, the groove and the valve plate form a throttle hole.

[0016] Preferably, the throttle hole is located on the valve plate, the throttle hole corresponds to the flow hole, and the cross-sectional area of ​​the throttle hole is smaller than the cross-sectional area of ​​the flow channel hole. When the oil presses the valve plate against the end of the piston, the throttle hole on the valve plate is effective.

[0017] Preferably, the valve plate is limited on the end of the piston by a limiter. There are multiple implementation methods of the limiter. One implementation method: a limit step is provided on the inner end of the piston rod, the piston is sleeved on the inner end of the piston rod, the piston is limited on the limit step by a nut, and the nut is threadedly connected to the piston rod. The nut limits the valve plate on the end of the piston; another implementation method: a limit step is provided on the piston, one end of the piston is threadedly connected to the nut, the valve plate is sleeved on the piston, and the valve plate is located between the limit step and the nut.

[0018] Preferably, the number of the flow channels is multiple, and the multiple flow channels are distributed in a circular pattern according to the central axis of the guide sleeve, so that when the damper is compressed, the oil in the inner cavity can evenly enter the outer cavity, evenly compress the volume compensation part, and prevent the volume compensation part from being displaced or damaged due to local compression; when the damper is pulled, the oil in the outer cavity can evenly enter the inner cavity, and prevent problems such as local idle travel.

[0019] Preferably, the guide sleeve includes a guide sleeve body and a guide portion arranged at the inner end of the guide sleeve body, the piston rod cooperates with the outer cylinder through the guide sleeve body, the inner cylinder sleeve is arranged on the guide portion and abuts against one end of the guide sleeve body provided with the guide portion, and the flow channel communicates with the end of the guide sleeve body provided with the guide portion and the side wall of the guide portion. This structure removes the traditional bottom valve, seals the bottom of the outer cylinder and the inner cylinder, and allows the oil to enter the outer cylinder through the through hole, and the structure and process are simpler.

[0020] Preferably, an oil seal is provided at the outer end of the guide sleeve, and an oil hole connecting the oil seal and the outer cavity is provided on the guide sleeve. The oil hole allows the accumulated oil in the oil seal to enter the outer cavity, thereby preventing the oil seal from bursting due to excessive accumulated oil.

[0021] Preferably, a sealing groove is provided on the side wall of the piston, a sealing ring is provided in the sealing groove, and the piston is sealed with the inner wall of the inner cylinder through the sealing ring. The sealing ring is used for sealing between the piston and the inner wall of the inner cylinder to prevent leakage during the reciprocating motion of the piston.

[0022] Preferably, the inner cylinder and the outer cylinder are filled with oil. The product can be used in any direction without any idle travel.

[0023] Therefore, the utility model has the following beneficial effects: by arranging a valve plate at the end of the piston and forming a throttling hole between the valve plate and the piston, the damper can generate a one-way large damping transmission support requirement when it is pulled or compressed; an outer cavity is formed by the sleeved outer cylinder and inner cylinder, and the volume compensation part is arranged in the outer cavity. Only an outer cylinder is added on the outside of the inner cylinder, which does not affect the external structure and length of the damper, so that the installation and use of the damper are not restricted, and the volume is only uniformly increased in the radial direction of the damper; a full-range reciprocating damper with no backlash is realized; this scheme removes the traditional bottom valve, seals the bottom of the working cylinder, and allows the oil to pass through the inner cavity and the outer cavity through the flow channel of the guide sleeve; the structure and process are simpler; after the volume compensation part is compressed, the rebound force is used to make the oil replenishing speed faster, there is no backlash, the damping is stable, there are universal accessories, it is easy to purchase in the market, the batch cost is low, and the use of guide sleeves and sealing rings greatly improves the service life; it can meet the one-way large damping transmission support requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0026] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle.

[0027] Figure 4 It is a structural schematic diagram of the guide sleeve in this embodiment.

[0028] As shown in the figure:

[0029] Inner cylinder 1, outer cylinder 2,

[0030] Piston 3, flow hole 3.1, groove 3.2,

[0031] Guide sleeve 4, flow channel 4.1, oil hole 4.2,

[0032] Volume compensation component 5, valve plate 6, piston rod 7, limit component 8, oil seal 9. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the technical solution embodiments of the utility model clearer, the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Embodiment 1, as Figure 1 , Figure 2 , Figure 3 , Figure 4A zero-backlash damper is shown, comprising an inner cylinder 1 and an outer cylinder 2 sleeved outside the inner cylinder 1, wherein a piston 3 driven by a piston rod 7 is arranged in the inner cylinder 1, wherein the inner cylinder 1 divides the outer cylinder 2 into an inner cavity and an outer cavity, wherein the piston rod 7 cooperates with the inner cylinder 1 and the outer cylinder 2 respectively through a guide sleeve 4, wherein a flow channel 4.1 connecting the inner cavity and the outer cavity is arranged on the guide sleeve 4, wherein a volume compensating member 5 is arranged in the outer cavity, wherein a flow hole 3.1 is arranged on the piston 3, and a valve plate 6 is arranged on a sliding sleeve at one end of the piston 3, wherein a throttling hole is formed between the valve plate 6 and the piston 3.

[0035] The existing damper includes a cylinder, a piston 3 disposed in the cylinder, and a piston rod 7 driving the piston 3. The piston rod 7 has a large damping effect when pulled out or compressed, and the damping magnitude is equal when the damper is pulled and compressed. In many use cases, the characteristics of such a damper are single and the layout is not reasonable. When the use case requires small return resistance and fast return speed or small compression resistance and fast compression speed, the traditional damper cannot meet the transmission support requirements of unidirectional large damping.

[0036] Therefore, the zero-backlash damper described in the above embodiment is provided with a valve plate 6 at the end of the piston 3, and a throttle hole is formed between the valve plate 6 and the piston 3, so that the damper generates a one-way large damping transmission support requirement when it is pulled or compressed. When the damper is compressed, the oil in the rodless chamber of the inner cylinder 1 enters the rod chamber of the inner cylinder 1, and the oil in the rod chamber of the inner cylinder 1 enters the outer chamber, and compresses the volume compensation member 5 to provide volume for the oil; when the damper is pulled, the volume compensation member 5 is restored, and the oil in the outer chamber enters the inner cylinder 1. The one-way damping of the damper is adjusted by the valve plate 6 provided at one end of the piston 3. The valve plate 6 has two states: open and pressed on the piston 3, so that the damper meets the one-way large damping transmission support requirement. At the same time, the rebound force of the volume compensation member 5 is used to make the oil replenishment speed faster, which has the advantages of zero backlash, stable damping, universal accessories, easy market purchase, and low batch cost. The guide sleeve 4 is formed in one step and can be directly manufactured, omitting other processes such as opening holes in the inner cylinder 1, and also reducing the cost of the guide sleeve 4. The problem that the existing damper has equal damping magnitudes when subjected to tension and compression and cannot meet the transmission support requirements of unidirectional large damping is solved.

[0037] The valve plate 6 is optimized, such as Figure 1 , Figure 2As shown, the valve plate 6 is limited on the end of the piston 3 by a limiter 8. There are multiple implementation methods of the limiter 8. One implementation method: a limit step is provided on the inner end of the piston rod 7, the piston 3 is sleeved on the inner end of the piston rod 7, the piston 3 is limited on the limit step by a nut, and the nut is threadedly connected to the piston rod 7. The nut limits the valve plate 6 on the end of the piston 3; another implementation method: a limit step is provided on the piston 3, one end of the piston 3 is threadedly connected to the nut, the valve plate 6 is sleeved on the piston 3, and the valve plate 6 is located between the limit step and the nut.

[0038] The flow channel 4.1 is further optimized, and the number of the flow channels 4.1 is multiple, and the multiple flow channels 4.1 are distributed in a circle according to the central axis of the guide sleeve 4. When the damper is compressed, the oil in the inner cavity can evenly enter the outer cavity, evenly compress the volume compensation part 5, and prevent the volume compensation part 5 from being dislocated or damaged due to local compression; when the damper is pulled, the oil in the outer cavity can evenly enter the inner cavity, and prevent problems such as local idle travel.

[0039] The guide sleeve 4 is further optimized, and the guide sleeve 4 includes a guide sleeve 4 body and a guide portion arranged at the inner end of the guide sleeve 4 body. The piston rod 7 cooperates with the outer cylinder 2 through the guide sleeve 4 body. The inner cylinder 1 is sleeved on the guide portion and abuts against one end of the guide portion provided on the guide sleeve 4 body. The flow channel 4.1 communicates with the end of the guide portion provided on the guide sleeve 4 body and the side wall of the guide portion. This structure removes the traditional bottom valve, seals the bottom of the outer cylinder 2 and the inner cylinder 1, and allows the oil to enter the outer cylinder 2 through the through hole, and the structure and process are simpler.

[0040] The guide sleeve 4 is further optimized, and an oil seal 9 is provided at the outer end of the guide sleeve 4, and an oil hole 4.2 connecting the oil seal 9 and the outer cavity is provided on the guide sleeve 4. The oil hole 4.2 allows the accumulated oil in the oil seal 9 to enter the outer cavity, preventing the oil seal 9 from bursting due to excessive accumulated oil.

[0041] In this embodiment, a sealing groove is provided on the side wall of the piston 3, a sealing ring is provided in the sealing groove, and the piston 3 is sealed with the inner wall of the inner cylinder 1 through the sealing ring. The sealing ring is used to seal between the piston 3 and the inner wall of the inner cylinder 1 to prevent leakage during the reciprocating motion of the piston 3.

[0042] Specifically, the inner cylinder 1 and the outer cylinder 2 are filled with oil. The product can be used in any direction without any idle travel.

[0043] Embodiment 2: The basic structure is based on Embodiment 1, and the throttle hole is further optimized. There are multiple ways to implement the throttle hole: (1) The throttle hole includes a groove 3.2 arranged at the end of the piston 3, and the groove 3.2 and the valve plate 6 form a throttle hole. The throttle hole passes through the outer side of the valve plate 6 and the flow hole 3.1, and the cross-sectional area of ​​the throttle hole is smaller than the cross-sectional area of ​​the flow channel 4.1 hole. When the oil presses the valve plate 6 against the end of the piston 3, the groove 3.2 and the valve plate 6 form a throttle hole; (2) The throttle hole is located on the valve plate 6, and the throttle hole corresponds to the flow hole 3.1, and the cross-sectional area of ​​the throttle hole is smaller than the cross-sectional area of ​​the flow channel 4.1 hole. When the oil presses the valve plate 6 against the end of the piston 3, the throttle hole located on the valve plate 6 is effective.

[0044] The basic structure is based on the second embodiment, and the volume compensation member 5 is further optimized, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 The illustrated embodiment of a zero-backlash damper comprises an inner cylinder 1 and an outer cylinder 2 sleeved outside the inner cylinder 1. A piston 3 driven by a piston rod 7 is arranged in the inner cylinder 1. The inner cylinder 1 divides the outer cylinder 2 into an inner cavity and an outer cavity. The piston rod 7 cooperates with the inner cylinder 1 and the outer cylinder 2 respectively through a guide sleeve 4. A flow channel 4.1 connecting the inner cavity and the outer cavity is arranged on the guide sleeve 4. A volume compensation member 5 is arranged in the outer cavity. A flow hole 3.1 is arranged on the piston 3. A valve plate 6 is arranged on one end of the piston 3. A throttling hole is formed between the valve plate 6 and the piston 3. The volume compensation member 5 is an airbag, and the airbag is located in the outer cavity. The volume compensation member 5 is an airbag in a natural state. The airbag is a bag with air arranged therein, so that the pressure inside the bag is consistent with the pressure outside the bag. At this time, the compression and recovery of the airbag have little effect on the damping and can be ignored, that is, the power provided to the oil by the airbag during recovery can be ignored, and only the effect of providing volume to the oil by the airbag during compression is considered. One-way large damping is achieved by the valve plate 6 cooperating with the piston 3.

[0045] When the valve plate 6 is located at the end of the piston 3 facing the guide sleeve 4, when the damper is under pressure, the oil in the rodless cavity of the inner cylinder 1 reopens the valve plate 6 and enters the rod cavity of the inner cylinder 1. The oil in the rod cavity of the inner cylinder 1 enters the outer cavity through the flow channel 4.1 of the guide sleeve 4 and compresses the airbag to provide volume for the oil. At this time, the damping generated by the airbag is very small and can be ignored. When the damper is under tension, the oil in the rod cavity of the inner cylinder 1 enters the rodless cavity of the inner cylinder 1 through the throttling hole and the flow hole 3.1. At this time, the oil presses the valve plate 6 against the piston 3, and the oil in the outer cylinder 2 enters the inner cavity through the flow channel 4.1 of the guide sleeve 4, and the airbag recovers. The damper has small damping when it is under pressure and large damping when it is under tension. The small damping can be ignored, and the large damping can be controlled by the valve plate 6, which can meet the transmission support requirements of unidirectional large damping.

[0046] When the valve plate 6 is located at the end of the piston 3 away from the guide sleeve 4, when the damper is under pressure, the oil in the rodless chamber of the inner cylinder 1 enters the rod chamber of the inner cylinder 1 through the throttling hole and the flow hole 3.1. At this time, the oil presses the valve plate 6 against the piston 3, and the oil in the rod chamber of the inner cylinder 1 enters the outer chamber through the flow channel 4.1 of the guide sleeve 4, and compresses the airbag to provide volume for the oil. At this time, the damping generated by the airbag is very small and can be ignored. The valve plate 6 is mainly used to form a large damping. When the damper is pulled, the oil in the rod chamber of the inner cylinder 1 breaks the valve plate 6 and enters the rodless chamber of the inner cylinder 1. The oil in the outer cylinder 2 enters the inner chamber through the flow channel 4.1 of the guide sleeve 4, and the airbag recovers. The damper has large damping when it is under pressure and no damping when it is pulled. The large damping is controllable through the valve plate 6, which can meet the transmission support requirements of unidirectional large damping.

[0047] The basic structure is based on the second embodiment, and the volume compensation part 5 is further optimized. A zero-lost-motion damper includes an inner cylinder 1 and an outer cylinder 2 sleeved outside the inner cylinder 1. A piston 3 driven by a piston rod 7 is arranged in the inner cylinder 1. The inner cylinder 1 divides the outer cylinder 2 into an inner cavity and an outer cavity. The piston rod 7 cooperates with the inner cylinder 1 and the outer cylinder 2 respectively through a guide sleeve 4. The guide sleeve 4 is provided with a flow channel 4.1 connecting the inner cavity and the outer cavity. The volume compensation part 5 is arranged in the outer cavity. A flow hole 3.1 is arranged on the piston 3. A valve plate 6 is provided on one end of the piston 3. A throttling hole is formed between the valve plate 6 and the piston 3. The airbag is filled with high-pressure air or high-pressure inert gas. The valve plate 6 is located at the end of the piston 3 away from the guide sleeve 4. When the valve plate 6 is located at the end of the piston 3 away from the guide sleeve 4, when the damper is compressed, the oil in the rodless chamber of the inner cylinder 1 enters the rod chamber of the inner cylinder 1 through the throttling hole and the flow hole 3.1. At this time, the oil presses the valve plate 6 against the piston 3, and the oil in the rod chamber of the inner cylinder 1 enters the outer chamber through the flow channel 4.1 of the guide sleeve 4, and compresses the airbag to provide volume for the oil. The airbag generates damping during the compression of the damper; When the damper is pulled, the oil in the rod chamber of the inner cylinder 1 pushes the valve plate 6 into the rodless chamber of the inner cylinder 1, and the airbag restores the oil in the outer cylinder 2 to enter the inner chamber through the flow channel 4.1 of the guide sleeve 4 to provide power. The damper has large damping when it is compressed and no damping when it is pulled. The large damping is generated by the valve plate 6 and the airbag, which can meet the transmission support requirements of unidirectional large damping.

[0048] The basic structure is based on the second embodiment, and the volume compensation part 5 is further optimized. A zero-backlash damper includes an inner cylinder 1 and an outer cylinder 2 sleeved outside the inner cylinder 1. A piston 3 driven by a piston rod 7 is arranged in the inner cylinder 1. The inner cylinder 1 divides the outer cylinder 2 into an inner cavity and an outer cavity. The piston rod 7 cooperates with the inner cylinder 1 and the outer cylinder 2 respectively through a guide sleeve 4. The guide sleeve 4 is provided with a flow channel 4.1 connecting the inner cavity and the outer cavity. A volume compensation part 5 is arranged in the outer cavity. A flow hole 3.1 is arranged on the piston 3. A valve plate 6 is provided on one end of the piston 3. A throttling hole is formed between the valve plate 6 and the piston 3. The volume compensation part 5 is a foam rubber, and the foam rubber is located in the outer cavity. The effect of the foam rubber is consistent with the effect of the airbag in the natural state. At this time, the compression and rebound of the foam rubber have little effect on the damping and can be ignored, that is, the power provided to the oil by the foam rubber when rebounding can be ignored, and only the effect of providing volume to the oil when the foam rubber is compressed is considered. One-way large damping is achieved by the valve plate 6 cooperating with the piston 3.

[0049] In summary, the utility model has the following beneficial effects: by arranging a valve plate 6 at the end of the piston 3 and forming a throttling hole between the valve plate 6 and the piston 3, the damper can generate a transmission support requirement of large unidirectional damping when it is pulled or compressed; an outer cavity is formed by the sleeved outer cylinder 2 and the inner cylinder 1, and the volume compensation member 5 is arranged in the outer cavity. Only an outer cylinder 2 is added to the outer side of the inner cylinder 1, which does not affect the external structure and length of the damper, so that the installation and use of the damper are not restricted, and the volume is only uniformly increased in the radial direction of the damper; a full-range reciprocating damper with zero backlash is realized; this scheme removes the traditional bottom valve, seals the bottom of the working cylinder, and allows the oil to pass through the flow channel 4.1 of the guide sleeve 4 through the inner cavity and the outer cavity; making the structure and process simpler; after the volume compensation member 5 is compressed, the rebound force is used to make the oil replenishing speed faster, without backlash, stable damping, universal accessories, easy to purchase in the market, and batch production

[0050] The specific embodiments described above are only preferred implementations of the present invention, and are not intended to limit the specific implementation scope of the present invention. All equivalent changes made in accordance with the shape and structure of the present invention should be included in the protection scope of the present invention.

Claims

1. A zero-loss damper, comprising an inner cylinder and an outer cylinder sleeved outside the inner cylinder, wherein a piston driven by a piston rod is arranged in the inner cylinder, wherein: The inner cylinder divides the outer cylinder into an inner cavity and an outer cavity. The piston rod cooperates with the inner cylinder and the outer cylinder respectively through a guide sleeve. The guide sleeve is provided with a flow channel connecting the inner cavity and the outer cavity. A volume compensation part is provided in the outer cavity. A flow hole is provided on the piston. A valve plate is provided on a sliding sleeve at one end of the piston, and a throttling hole is formed between the valve plate and the piston.

2. A zero-backlash damper according to claim 1, characterized in that: The volume compensation piece is an airbag, and the airbag is located in the outer cavity.

3. A zero-backlash damper according to claim 2, characterized in that: The air bag is filled with high-pressure air or high-pressure inert gas, and the valve sheet is located at an end of the piston away from the guide sleeve.

4. A zero-backlash damper according to claim 1, characterized in that: The volume compensation piece is foam rubber, and the foam rubber is located in the outer cavity.

5. A zero-backlash damper according to claim 1, 2, 3 or 4, characterized in that: The throttle hole includes a groove arranged at the end of the piston, the groove and the valve plate form a throttle hole, the throttle hole passes through the outside of the valve plate and the flow hole, and the cross-sectional area of ​​the throttle hole is smaller than the cross-sectional area of ​​the flow hole.

6. A zero-backlash damper according to claim 1, 2, 3 or 4, characterized in that: The throttling hole is located on the valve plate, the throttling hole corresponds to the flow hole, and the cross-sectional area of ​​the throttling hole is smaller than the cross-sectional area of ​​the flow hole.

7. A zero-backlash damper according to claim 1, 2, 3 or 4, characterized in that: The valve plate is limited on the end of the piston by a limiting member.

8. A zero-backlash damper according to claim 1, 2, 3 or 4, characterized in that: There are multiple flow channels, and the multiple flow channels are distributed in a circle according to the central axis of the guide sleeve.

9. A zero-backlash damper according to claim 1, 2, 3 or 4, characterized in that: The guide sleeve includes a guide sleeve body and a guide portion arranged at the inner end of the guide sleeve body. The piston rod cooperates with the outer cylinder through the guide sleeve body. The inner cylinder sleeve is arranged on the guide portion and abuts against one end of the guide sleeve body provided with the guide portion. The flow channel connects the end of the guide sleeve body provided with the guide portion and the side wall of the guide portion.

10. A zero-backlash damper according to claim 1, 2, 3 or 4, characterized in that: An oil seal is arranged at the outer end of the guide sleeve, and an oil hole communicating with the oil seal and the outer cavity is arranged on the guide sleeve.

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