CN219197986U - Damper - Google Patents

Abstract

The utility model provides a damper capable of completely eliminating or effectively reducing idle stroke of the damper, which comprises an inner cylinder, a liquid storage cylinder, a first sealing component, a base valve component and a piston assembly, wherein the piston assembly comprises a piston rod and a piston component. When the piston rod is in a state of extending out to the maximum stroke, the liquid level of the working liquid in the inner cylinder is level with the liquid level of the working liquid in the liquid storage cylinder, and the liquid level of the working liquid in the inner cylinder is at least level with the lower surface of the piston assembly; when the piston rod is in the state of extending out to the maximum stroke, the volume of the space above the liquid level of the working liquid in the liquid storage cavity is a first volume, the volume of the space above the liquid level of the working liquid in the inner cylinder and not occupied by the piston assembly is a second volume, and the part of the piston assembly above the liquid level of the working liquid is a first part; when the piston assembly is completely pressed into the bottom of the inner cylinder, the volume of the first part below the liquid level of the working liquid is smaller than or equal to the sum of the first volume and the second volume.

Description

Damper

Technical Field

The utility model relates to the technical field of dampers, in particular to a damper capable of eliminating or reducing idle stroke.

Background

The damper is a device for providing resistance to movement and consuming movement energy, and because the piston component and the bottom valve of the damper are respectively provided with the orifices, when working liquid passes through the orifices under the action of external pressure, viscous resistance can be generated, and then external movement can be buffered and external energy can be consumed, so that the hydraulic damper has good buffering and damping energy dissipation effects, and is widely applied to industries such as automobiles, photovoltaics, aerospace, military industry and the like at present.

In the existing double-cylinder hydraulic damper in the market, when the piston assembly compresses towards the inside of the damper, the piston assembly can enter the damper and occupy the inner space of the damper, so that when working liquid is added into the damper, the working liquid cannot be filled up, otherwise, when the piston assembly receives external pressure, the piston assembly cannot be compressed into the inside of the damper, so that the damper cannot work normally, and because the space of the damper in the prior art, which is not filled with the working liquid, is larger, when the piston assembly starts to press downwards towards the inside of the damper from the initial state that the piston rod is in the maximum stroke, the piston assembly cannot receive the resistance exerted by the working liquid on the piston assembly, and then the damper generates idle stroke, so that the shock absorption and energy dissipation effects of the damper are poor, the working stability of the damper is influenced, and even abnormal sound and other problems can be generated under certain working conditions.

Disclosure of Invention

Aiming at the technical problems in the prior art, the utility model provides the damper, which is improved in the structure of the damper in the prior art, and the improved damper can effectively reduce or even completely eliminate the idle stroke of the damper, so that the shock absorption and energy dissipation capacity and the working stability of the damper are improved, and the application scene of the damper is enlarged.

The present utility model provides a damper, comprising: an inner cylinder filled with working liquid; a liquid storage cylinder coaxially arranged outside the inner cylinder, wherein a liquid storage cavity is formed in a region between the inner wall of the liquid storage cylinder and the outer wall of the inner cylinder; both ends of the liquid storage cylinder are sealed; the first sealing component is arranged at the first end of the inner cylinder and is used for sealing the first end of the inner cylinder; a base valve assembly disposed at a second end of the inner cartridge, the base valve assembly being switchable between an open and a closed state to communicate or isolate the inner cartridge from the reservoir; the piston assembly comprises a piston assembly and a piston rod; the piston assembly is arranged in the inner cylinder and is in sliding fit with the inner wall of the inner cylinder, and the piston assembly divides the inner cylinder into a first chamber and a second chamber along the axial direction of the inner cylinder; the piston assembly comprises a piston body provided with a flow passage and a throttle valve assembly assembled with the flow passage in a matching way; the throttle valve assembly is switchable between a closed and an open state to isolate the first chamber from the second chamber or to communicate through the flow passage; the first end of the piston rod is connected with the piston assembly, and the second end of the piston rod extends out of the inner cylinder and the liquid storage cylinder after passing through the first sealing assembly; when the piston rod is in a state of extending out to the maximum stroke, the liquid level of the working liquid in the inner cylinder is level with the liquid level of the working liquid in the liquid storage cylinder, and the liquid level of the working liquid in the inner cylinder is at least level with the lower surface of the piston assembly; wherein when the piston rod is in the maximum stroke state, the volume of the space above the liquid level of the working liquid in the liquid storage cavity is a first volume, the volume of the space above the liquid level of the working liquid in the inner cylinder and not occupied by the piston assembly is a second volume, and the part of the piston assembly above the liquid level of the working liquid is a first component; when the piston assembly is completely pressed into the bottom of the inner cylinder, the volume of the first component below the liquid level of the working liquid is smaller than or equal to the sum of the first volume and the second volume.

As an improvement of the damper according to the present utility model, the liquid level of the working fluid in the inner cylinder is at least flush with the upper surface of the piston assembly when the piston rod is in the extended maximum stroke state.

As an improvement of the damper, the inner cylinder comprises a working cylinder and a working cylinder extension part which are communicated with each other and coaxially and continuously arranged; the working cylinder and the working cylinder extension part are integrally formed, or the working cylinder and the working cylinder extension part are two mutually independent components; the piston assembly is arranged in the working cylinder; the area of the end opening of the working cylinder extension near the side of the working cylinder is smaller than the area of the upper surface of the piston assembly, so that the piston assembly is prevented from entering the working cylinder extension, and the maximum extension stroke of the piston rod is limited.

As an improvement of the damper of the present utility model, an end face of the cylinder extension portion on a side close to the cylinder is a first end face; when the piston rod is in the state of extending out to the maximum stroke, the first end face is flush with the liquid level of the working liquid in the inner cylinder.

As an improvement of the damper of the present utility model, when the piston rod is in the extended maximum stroke state, the sum of the volume of the space in the reservoir above the plane of the first end face and the volume of the space in the cylinder extension not occupied by the piston rod is equal to the volume of the piston rod in the cylinder when the piston assembly is fully pressed into the bottom of the inner cylinder.

As an improvement of the damper of the present utility model, the inner wall of the cylinder extension is in close sliding fit with the piston rod, and the volume of the space in the reservoir above the plane of the first end face is equal to the volume of the piston rod in the cylinder when the piston assembly is fully pressed into the bottom of the inner cylinder.

As an improvement of the damper, the extension part of the working cylinder is a piston rod guide extension sleeve mutually independent with the working cylinder, and one end of the piston rod guide extension sleeve, which is close to the working cylinder, is a spigot structure for assembling and connecting with a corresponding port of the working cylinder.

As an improvement of the damper, the piston assembly further comprises a limiting piece, wherein the limiting piece is fixedly arranged on the piston rod, and is positioned above the piston assembly and can limit the maximum stroke of the piston rod extending outwards.

The damper further comprises a guide device, wherein the guide device is arranged between the first end of the inner cylinder and the first sealing assembly and is used for guiding the piston rod.

The damper further comprises a dust cover, wherein the dust cover is arranged on the outer side of the liquid storage cylinder, and the top of the dust cover is fixedly connected with the second end of the piston rod and synchronously moves along with the piston rod.

Compared with the prior art, the damper provided by the utility model has the following beneficial effects:

1. in the damper provided by the utility model, the inner space of the damper and the amount of the filled working liquid are specially designed, so that when the piston rod in the damper is in a state of extending out of the maximum stroke, the liquid level of the working liquid in the inner cylinder is level with the liquid level of the working liquid in the liquid storage cylinder, and the liquid level of the working liquid in the inner cylinder is at least level with the lower surface of the piston assembly; at the same time, when the piston assembly is completely pressed into the bottom of the inner cylinder, the volume of the first part of the piston assembly below the liquid level of the working liquid is smaller than or equal to the sum of the first volume in the liquid storage cavity and the second volume in the inner cylinder. Through the special design, the piston rod in the piston assembly can be ensured to be immediately contacted with working fluid when the piston rod starts to be pressed down from the initial state of extending out to the maximum stroke, so that proper resistance can be generated to the movement of the piston assembly, the idle stroke of the damper is reduced, and meanwhile, the interior of the damper can provide enough accommodating space for the pressing down of the piston assembly, so that the piston assembly is smoothly pressed into the damper under the action of external pressure.

2. In the damper provided by the utility model, when the piston rod is in the state of extending out to the maximum stroke, the liquid level of the working liquid in the inner cylinder is at least flush with the upper surface of the piston assembly, so that the piston assembly can be completely immersed in the working liquid, and the resistance exerted by the working liquid on the piston rod in the piston assembly can be always completely received in the process of starting to press down the piston rod in the piston assembly from the initial state of extending out to the maximum stroke, so that the idle stroke of the damper can be completely eliminated.

Of course, it is not necessary for any one product to practice the utility model to achieve all of the advantages set forth above at the same time.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

FIG. 1 is a longitudinal sectional view of a damper in embodiment 1 of the present utility model;

FIG. 2 is an enlarged view of a portion of area A of FIG. 1;

FIG. 3 is an enlarged view of a portion of region B of FIG. 1;

FIG. 4 is a longitudinal sectional view of a damper of embodiment 1 to which another inner tube structure is applied;

FIG. 5 is a longitudinal sectional view of a damper of embodiment 1 to which another inner tube structure is applied;

fig. 6 is a longitudinal sectional view of the damper in embodiment 2.

The correspondence between each mark and the part name is as follows:

1-first rod end bearing, 2-cylinder extension, 3-cylinder, 4-reservoir, 5-dust cap, 6-piston rod, 7-piston assembly, 8-base valve assembly, 9-second rod end bearing, 10 inner cylinder, 11-piston assembly, 12-pilot, 13-first seal assembly, 14-piston body, 15-flow passage, 16-throttle valve assembly, 17-stopper, 18-stopper.

Detailed Description

The present utility model will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present utility model.

Example 1

Referring to fig. 1-3, the present embodiment provides a damper, specifically including:

an inner cylinder 10, wherein the inner cylinder 10 is filled with working fluid; specifically, in this embodiment, the inner cylinder is of a circular tube structure, and the working fluid in the damper is silicone oil, however, in other embodiments, the inner cylinder may be other suitable mechanisms, and the working fluid may also be other working fluids capable of meeting the actual requirements of the damper, and the utility model is not limited in particular;

a reservoir 4 coaxially provided outside the inner tube 10, the region between the inner wall of the reservoir 4 and the outer wall of the inner tube 10 forming a reservoir; both ends of the reservoir cartridge 4 are sealed by sealing members; specifically, in this embodiment, the liquid storage cylinder 4 is also in a circular tubular structure, the liquid storage cylinder 4 and the inner cylinder 10 are concentrically sleeved, and the length of the liquid storage cylinder 4 is greater than or equal to the length of the inner cylinder, and the liquid storage cavity is an annular area formed by surrounding the inner wall of the liquid storage cylinder 4 and the outer wall of the inner cylinder 10;

a first sealing assembly 13 disposed at the first end of the inner cylinder 10 for sealing the first end of the inner cylinder 10; specifically, in this embodiment, the first sealing component 13 can simultaneously seal the first end of the inner cylinder 10 and the port corresponding to the reservoir cylinder 4, and of course, in other embodiments, the port seal of the inner cylinder 10 and the port seal of the reservoir cylinder 4 may be different sealing components, which is not limited by the present utility model, so long as the sealing effect can be achieved;

a base valve assembly 8 disposed at a second end of the inner cartridge 10, the base valve assembly 8 being capable of switching between an open and a closed state to allow the inner cartridge 10 to communicate with or be isolated from the reservoir; when the piston assembly 11 in the damper is subjected to external force and slides in the inner cylinder 10, if the pressure difference between the inner cylinder 10 and the reservoir is greater than a preset threshold, the base valve assembly 8 is opened so that the inner cylinder 10 communicates with the reservoir, and if there is no pressure difference between the inner cylinder 10 and the reservoir, the base valve assembly 8 is closed so that the inner cylinder 10 is isolated from the reservoir;

a piston assembly 11 comprising a piston assembly 7 and a piston rod 6; the piston assembly 7 is arranged in the inner cylinder 10 and is in sliding fit with the inner wall of the inner cylinder 10, and the piston assembly 7 divides the inner cylinder 10 into a first chamber and a second chamber along the axial direction of the inner cylinder 10; the piston assembly 7 comprises a piston body provided with a flow passage and a throttle valve assembly matched and assembled with the flow passage; the throttle valve assembly can be switched between a closing state and an opening state so as to isolate the first chamber from the second chamber or communicate with the second chamber through a flow passage; the first end of the piston rod 6 is connected with the piston assembly 7, and the second end of the piston rod 6 extends out of the inner cylinder 10 and the liquid storage cylinder 4 after passing through the first sealing assembly 13; when the piston assembly 11 in the damper is subjected to external force and slides in the inner cylinder 10, if the pressure difference between the first chamber and the second chamber of the inner cylinder 10 is greater than a preset threshold value, the throttle valve assembly on the piston assembly 7 is opened to allow the first chamber and the second chamber to communicate, and if there is no pressure difference between the first chamber and the second chamber, the throttle valve assembly is closed to allow the first chamber and the second chamber to be isolated;

when the piston rod 6 is in the state of extending the maximum stroke, the liquid level of the working liquid in the inner cylinder 10 is flush with the liquid level of the working liquid in the liquid storage cylinder 4, and the liquid level of the working liquid in the inner cylinder 10 is at least flush with the lower surface of the piston assembly 7, i.e., the liquid level of the working liquid is flush with the lower surface of the piston assembly 7 or higher than the lower surface of the piston assembly 7;

wherein when the piston rod 6 is in the maximum stroke state, that is, when the piston rod 6 is maximally extended to the outside of the damper, the volume of the space above the liquid surface of the working liquid in the reservoir is a first volume, the volume of the space above the liquid surface of the working liquid in the inner cylinder 10 and not occupied by the piston assembly 11 is a second volume, and the portion of the piston assembly 11 above the liquid surface of the working liquid is a first member; it should be noted that, since the liquid level of the working fluid in the inner cylinder 10 is flush with the lower surface of the piston assembly 7 or higher than the lower surface of the piston assembly 7 when the piston rod 6 is in the extended maximum stroke state, when the liquid level of the working fluid in the inner cylinder 10 is flush with the lower surface of the piston assembly 7, the first member is the piston assembly 11 as a whole, and when the liquid level of the working fluid in the inner cylinder 10 is higher than the lower surface of the piston assembly 7, since a part of the piston assembly 11 is submerged by the working fluid, below the liquid level of the working fluid, the first member is only the part of the piston assembly above the liquid level of the working fluid, not the piston assembly 11 as a whole;

when the piston assembly 7 is fully pressed into the bottom of the inner cylinder 10, i.e. when the piston rod 6 is maximally pressed into the interior of the damper, the volume of the first part below the liquid surface of the working liquid is less than or equal to the sum of said first volume and said second volume.

According to the utility model, through the design principle, the volume of the piston assembly 11 and the working fluid filled in the damper are mutually matched, so that the piston rod 6 in the piston assembly 11 can be immediately contacted with the working fluid when being pushed down from the initial state of extending out of the maximum stroke, and further, proper resistance can be generated on the movement of the piston assembly 11, the idle stroke of the damper is reduced, and meanwhile, enough accommodating space can be provided for the pushing down of the piston assembly 11 in the damper, so that the piston assembly 11 can be smoothly pressed into the damper under the action of external pressure, and further, the functions of buffering, damping and energy dissipation are achieved.

Further, in the present embodiment, a guide 12 is further included in the damper, the guide 12 is disposed between the first end of the inner cylinder 10 and the first sealing member 13 for guiding the piston rod 6, and at the same time, in order to prevent external dust or the like from adhering to the surface of the piston rod 6 and being carried into the interior of the damper by the piston rod 6, a dust cover 5 is further disposed in the damper, the dust cover 5 is covered outside the reservoir 4, and the top of the dust cover 5 is fixedly connected with the second end of the piston rod 6 and moves synchronously with the piston rod 6.

Preferably, the level of the working fluid in the inner cylinder 10 is at least flush with the upper surface of the piston assembly 7 when the piston rod 6 is in the extended maximum stroke state. With the preferred design, when the piston rod 6 is in the state of extending the maximum stroke, the piston assembly 7 can be completely immersed in the working fluid, and in the process that the piston rod 6 in the piston assembly 11 is pressed down to the inside of the damper from the initial state of extending the maximum stroke, the resistance applied by the working fluid can be always completely received, and then the idle stroke of the damper can be completely eliminated, so that the operation of the damper is more stable.

Further, in the present embodiment, the inner cylinder 10 includes the working cylinder 3 and the working cylinder extension 2 that are communicated with each other and coaxially and successively provided; the piston assembly 7 is disposed in the working cylinder 3, and the area of the end opening of the working cylinder extension 2 on the side close to the working cylinder 3 is smaller than the area of the upper surface of the piston assembly 7, so as to prevent the piston assembly 7 from entering the working cylinder extension 2, thereby limiting the maximum outward extension stroke of the piston rod 6, and simultaneously, the space in the working cylinder extension 2 and the upper space of the liquid storage cylinder 4 provide a flowing space for the working liquid in the damper because the piston assembly 11 occupies the space originally occupied by the working liquid when being pressed into the damper.

In the specific embodiment, as shown in fig. 4 and 5, the cylinder 3 and the cylinder extension 2 are integrally formed, or the cylinder 3 and the cylinder extension 2 are two independent members. When the working cylinder 3 and the working cylinder extension part 2 are in an integrated structure, the following specific implementation manner can be adopted: (1) As shown in fig. 5, the cylinder 3 and the cylinder extension 2 are two continuous pipe sections of the same pipe but of different pipe diameters, and the pipe diameter of the cylinder extension 2 is smaller than the pipe diameter of the cylinder 3 to prevent the piston assembly 7 from entering the cylinder extension 2 from the cylinder 3; (2) As shown in fig. 4, the cylinder 3 and the cylinder extension 2 are two continuous pipe sections of the same pipe, but the joint of the two pipe sections is provided with a stopper 17, by which stopper 17 the piston assembly 7 is prevented from entering the cylinder extension 2 from the cylinder 3. When the working cylinder 3 and the working cylinder extension 2 are two independent components, the following specific implementation manner may be adopted: (1) As shown in fig. 1 and 5, the working cylinder 3 and the working cylinder extension 2 are two independent pipes, and the two pipes are connected in a proper joint mode such as welding, clamping and the like, the pipe diameter of the working cylinder extension 2 is smaller than that of the working cylinder 3, so that the piston assembly 7 is prevented from entering the working cylinder extension 2 from the working cylinder 3; (2) As shown in fig. 4, the cylinder 3 and the cylinder extension 2 are two independent pipes having the same pipe diameter, and are connected by welding, clamping, or other suitable joint means, but a stopper 17 is provided at the joint of the two pipes, and the piston assembly 7 is prevented from entering the cylinder extension 2 from the cylinder 3 by the stopper 17. It should be noted that the above-listed implementations are not exhaustive of all implementations, and in other embodiments, other implementations may be employed that are capable of implementing the inventive concept.

Further, in the present embodiment, the end face of the cylinder extension 2 on the side close to the cylinder 3 is the first end face; when the piston rod 6 is in the extended maximum stroke state, the first end face is flush with the level of the working fluid in the inner cylinder 10. The sum of the volume of the space in the reservoir above the plane of the first end face and the volume of the space in the cylinder extension 2 not occupied by the piston rod 6 when the piston rod 6 is in the extended maximum stroke state is equal to the volume of the piston rod in the cylinder 3 when the piston assembly is fully pressed into the bottom of the inner cylinder 10. By adopting the design, the idle stroke of the damper can be eliminated, the amount of working liquid filled in the damper can be reduced as much as possible, the reserved space in the damper can be reduced, and the overall compactness of the damper can be improved and the cost can be reduced.

Preferably, in this embodiment, the inner wall of the cylinder extension 2 is in a close sliding fit with the piston rod 6 and the volume of the space in the reservoir above the plane of the first end face is equal to the volume of the piston rod in the cylinder when the piston assembly is fully pressed into the bottom of the inner cylinder. Specifically, in the present embodiment, the cylinder extension 2 is a piston rod guide extension sleeve independent from the cylinder 3, and one end of the piston rod guide extension sleeve, which is close to the cylinder 3, is a spigot structure for fitting connection with a corresponding port of the cylinder 3. The working cylinder extension part 2 is arranged as a piston rod guider extension sleeve, so that on one hand, the extending stroke of the piston rod 6 to the outside of the damper can be limited, on the other hand, the guiding distance of the piston rod 6 can be prolonged, the stability of the piston rod 6 when extending or retracting is improved, and further the stability of the whole operation of the damper is improved.

Further, the second end of the piston rod 6 is also fixedly provided with a first rod end bearing 1, and the end of the damper remote from the second end of the piston rod is fixedly provided with a second rod end bearing 9, by providing the first rod end bearing 1 and the second rod end bearing 9, the connection of the damper with an external member can be facilitated.

Example 2.

As shown in fig. 6, the present embodiment provides a damper, specifically including:

an inner cylinder 10, wherein the inner cylinder 10 is filled with working fluid;

a reservoir 4 coaxially provided outside the inner tube 10, the region between the inner wall of the reservoir 4 and the outer wall of the inner tube 10 forming a reservoir; both ends of the reservoir cartridge 4 are sealed; .

A first sealing assembly 13 disposed at the first end of the inner cylinder 10 for sealing the first end of the inner cylinder 10;

a base valve assembly 8 disposed at a second end of the inner cartridge 10, the base valve assembly 8 being capable of switching between an open and a closed state to allow the inner cartridge 10 to communicate with or be isolated from the reservoir;

a piston assembly 11 comprising a piston assembly 7 and a piston rod 6; the piston assembly 7 is arranged in the inner cylinder 10 and is in sliding fit with the inner wall of the inner cylinder 10, and the piston assembly 7 divides the inner cylinder 10 into a first chamber and a second chamber along the axial direction of the inner cylinder 10; the piston assembly 7 comprises a piston body provided with a flow passage and a throttle valve assembly matched and assembled with the flow passage; the throttle valve assembly can be switched between a closing state and an opening state so as to isolate the first chamber from the second chamber or communicate with the second chamber through a flow passage; the first end of the piston rod 6 is connected with the piston assembly 7, and the second end of the piston rod 6 extends out of the inner cylinder 10 and the liquid storage cylinder 4 after passing through the first sealing assembly 13;

when the piston rod 6 is in the state of extending the maximum stroke, the liquid level of the working liquid in the inner cylinder 10 is flush with the liquid level of the working liquid in the liquid storage cylinder 4, and the liquid level of the working liquid in the inner cylinder 10 is at least flush with the lower surface of the piston assembly 7, i.e., the liquid level of the working liquid is flush with the lower surface of the piston assembly 7 or higher than the lower surface of the piston assembly 7;

wherein when the piston rod 6 is in the maximum stroke state, that is, when the piston rod 6 is maximally extended to the outside of the damper, the volume of the space above the liquid surface of the working liquid in the reservoir is a first volume, the volume of the space above the liquid surface of the working liquid in the inner cylinder 10 and not occupied by the piston assembly 11 is a second volume, and the portion of the piston assembly 11 above the liquid surface of the working liquid is a first member; it should be noted that, since the liquid level of the working fluid in the inner cylinder 10 is flush with the lower surface of the piston assembly 7 or higher than the lower surface of the piston assembly 7 when the piston rod 6 is in the extended maximum stroke state, when the liquid level of the working fluid in the inner cylinder 10 is flush with the lower surface of the piston assembly 7, the first member is the piston assembly 11 as a whole, and when the liquid level of the working fluid in the inner cylinder 10 is higher than the lower surface of the piston assembly 7, since a part of the piston assembly 11 is submerged by the working fluid, below the liquid level of the working fluid, the first member is only the part of the piston assembly above the liquid level of the working fluid, not the piston assembly 11 as a whole;

when the piston assembly 7 is fully pressed into the bottom of the inner cylinder 10, i.e. when the piston rod 6 is maximally pressed into the interior of the damper, the volume of the first part below the liquid surface of the working liquid is less than or equal to the sum of said first volume and said second volume.

Preferably, the level of the working fluid in the inner cylinder 10 is at least flush with the upper surface of the piston assembly 7 when the piston rod 6 is in the extended maximum stroke state. With the preferred design, when the piston rod 6 is in the state of extending the maximum stroke, the piston assembly 7 can be completely immersed in the working fluid, and in the process that the piston rod 6 in the piston assembly 11 is pressed down to the inside of the damper from the initial state of extending the maximum stroke, the resistance applied by the working fluid can be always completely received, and then the idle stroke of the damper can be completely eliminated, so that the operation of the damper is more stable.

Specifically, in this embodiment, as shown in fig. 6, the inner cylinder 10 and the reservoir 4 are of a complete circular tubular structure with uniform inner diameter, the piston assembly 11 further includes a limiting member 18, the limiting member 18 is fixedly disposed on the piston rod, and the limiting member 18 is located above the piston assembly, and the limiting member 18 can limit the maximum stroke of the piston rod extending outwards. Through setting up the locating part 18 on piston rod 6 to set up the distance between the up end of locating part 18 and the piston subassembly according to actual demand, when piston rod 6 is in the state of stretching out the maximum stroke, the locating part 18 can restrict the position of piston subassembly 7 in inner tube 10, and then can guarantee that piston subassembly 7 can fully submerge in the working fluid or make the lower surface of piston subassembly 7 and the liquid level of working fluid parallel and level, simultaneously, can reserve sufficient space in the liquid level top of the working fluid of reservoir 4 and inner tube 10 again for hold piston assembly 11 and be pressed into the working fluid that is displaced when the inner tube 10 bottom, and then make piston assembly 11 can be pressed into the attenuator inside smoothly, guarantee the normal work of attenuator, also can make the idle running in the attenuator effectively reduced to minimum or be eliminated completely simultaneously. Specifically, in the present embodiment, the limiting member 18 is a fin fixedly provided on the piston rod 6, and of course, in other embodiments, the limiting member may have other structures, as long as the position of the piston assembly 7 in the inner cylinder 10 can be limited according to actual requirements.

The foregoing describes specific embodiments of the present utility model. It is to be understood that the utility model is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the utility model. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.

Claims (10)

1. A damper, comprising:

an inner cylinder filled with working liquid;

a liquid storage cylinder coaxially arranged outside the inner cylinder, wherein a liquid storage cavity is formed in a region between the inner wall of the liquid storage cylinder and the outer wall of the inner cylinder; both ends of the liquid storage cylinder are sealed;

the first sealing component is arranged at the first end of the inner cylinder and is used for sealing the first end of the inner cylinder;

a base valve assembly disposed at a second end of the inner cartridge, the base valve assembly being switchable between an open and a closed state to communicate or isolate the inner cartridge from the reservoir;

the piston assembly comprises a piston assembly and a piston rod; the piston assembly is arranged in the inner cylinder and is in sliding fit with the inner wall of the inner cylinder, and the piston assembly divides the inner cylinder into a first chamber and a second chamber along the axial direction of the inner cylinder; the piston assembly comprises a piston body provided with a flow passage and a throttle valve assembly assembled with the flow passage in a matching way; the throttle valve assembly is switchable between a closed and an open state to isolate the first chamber from the second chamber or to communicate through the flow passage; the first end of the piston rod is connected with the piston assembly, and the second end of the piston rod extends out of the inner cylinder and the liquid storage cylinder after passing through the first sealing assembly;

when the piston rod is in a state of extending out to the maximum stroke, the liquid level of the working liquid in the inner cylinder is level with the liquid level of the working liquid in the liquid storage cylinder, and the liquid level of the working liquid in the inner cylinder is at least level with the lower surface of the piston assembly; wherein, the liquid crystal display device comprises a liquid crystal display device,

when the piston rod is in the state of extending out the maximum stroke, the volume of the space above the liquid level of the working liquid in the liquid storage cavity is a first volume, the volume of the space above the liquid level of the working liquid in the inner cylinder and not occupied by the piston assembly is a second volume, and the part of the piston assembly above the liquid level of the working liquid is a first component;

when the piston assembly is completely pressed into the bottom of the inner cylinder, the volume of the first component below the liquid level of the working liquid is smaller than or equal to the sum of the first volume and the second volume.

2. A damper according to claim 1 wherein the level of the working fluid in the inner barrel is at least level with the upper surface of the piston assembly when the piston rod is in the extended maximum stroke condition.

3. A damper according to claim 1 or 2, wherein,

the inner cylinder comprises a working cylinder and a working cylinder extension part which are communicated with each other and coaxially and continuously arranged; the working cylinder and the working cylinder extension part are integrally formed, or the working cylinder and the working cylinder extension part are two mutually independent components;

the piston assembly is arranged in the working cylinder;

the area of the end opening of the working cylinder extension near the side of the working cylinder is smaller than the area of the upper surface of the piston assembly, so that the piston assembly is prevented from entering the working cylinder extension, and the maximum extension stroke of the piston rod is limited.

4. A damper according to claim 3, wherein an end face of the cylinder extension portion on a side close to the cylinder is a first end face; when the piston rod is in the state of extending out to the maximum stroke, the first end face is flush with the liquid level of the working liquid in the inner cylinder.

5. A damper according to claim 4 wherein the sum of the volume of the space in the reservoir above the plane of the first end face and the volume of the space in the cylinder extension not occupied by the piston rod when the piston assembly is fully depressed into the bottom of the inner cylinder is equal to the volume of the piston rod in the cylinder when the piston rod is in the extended maximum stroke state.

6. A damper according to claim 5 wherein the inner wall of the cylinder extension is in close sliding engagement with the piston rod and the volume of the reservoir above the plane of the first end face is equal to the volume of the piston rod in the cylinder when the piston assembly is fully pressed into the bottom of the inner cylinder.

7. The damper of claim 6, wherein the cylinder extension is a rod guide extension sleeve independent of the cylinder, and wherein an end of the rod guide extension sleeve adjacent the cylinder is a spigot structure for mating connection with a corresponding port of the cylinder.

8. A damper according to claim 1 or claim 2, wherein the piston assembly further comprises a stop member fixedly disposed on the piston rod and located above the piston assembly, the stop member being capable of defining a maximum extent of outward extension of the piston rod.

9. The damper of claim 1, further comprising a guide disposed between the first end of the inner barrel and the first seal assembly for guiding the piston rod.

10. The damper of claim 1, further comprising a dust cap disposed outside the reservoir and having a top fixedly coupled to the second end of the piston rod and synchronously movable with the piston rod.

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