CN114688196A

CN114688196A - Push rod circulation hole type shock absorber

Info

Publication number: CN114688196A
Application number: CN202210178409.7A
Authority: CN
Inventors: 刘国兵; 成佳伟; 翁辉; 裴亦辰
Original assignee: Zhiji Automobile Technology Co Ltd
Current assignee: Zhiji Automobile Technology Co Ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2022-07-01

Abstract

The invention discloses a push rod flow hole type shock absorber which comprises a shock absorber body and a control valve, wherein the shock absorber body comprises an outer chamber, a middle chamber and an inner chamber; wall holes are arranged on the wall of the inner cylinder to communicate the inner chamber with the middle chamber; a first flow guide body is arranged in the middle cavity, and a first through hole is formed in the first flow guide body; a second flow guide body is arranged in the outer cavity and provided with a second through hole; the control valve comprises a push rod and a control assembly for controlling the movement of the push rod; the head of the push rod is provided with a circulation hole, the head of the push rod is embedded between the first flow guide body and the second flow guide body, so that the first through hole, the circulation hole and the second through hole form a flow channel for communicating the middle cavity with the outer cavity, and the opening degree of the flow channel is controlled through the movement of the push rod. The shock absorber is simple in structure, easy to produce and manufacture, low in cost and not prone to failure.

Description

Push rod circulation hole type shock absorber

Technical Field

The invention relates to a push rod circulation hole type shock absorber, and belongs to the technical field of shock absorbers.

Background

In order to improve the comfort of the vehicle, a shock absorber needs to be installed on the automobile. Shock absorbers can be divided into passive shock absorbers, semi-active shock absorbers and active shock absorbers. The suspension shock absorbers which are currently in more widespread use are conventional passive shock absorbers of the type whose damping characteristics cannot be adjusted. If the damping is set too small, the controllability and safety of the vehicle are affected; if the damping is set too large, the comfort of the vehicle ride is affected, so that the passive shock absorber can only compromise the controllability and the comfort by a fixed damping coefficient, and the damping curve is single and unchangeable. The damping coefficient of the semi-active shock absorber is variable, and the damping force of the semi-active shock absorber can be automatically adjusted according to the condition of the road surface. For an active shock absorber, it is possible not only to change the damping coefficient, but also to actively generate vibrations to counteract the vibrations of the vehicle.

The working principle of the shock absorber is as follows: when the frame and the axle reciprocate relatively, the oil in the shell of the shock absorber repeatedly flows from one cavity to the other cavity through narrow holes by utilizing the reciprocating motion of the piston in the shock absorber in the cylinder. At the moment, the friction between the hole wall and the oil liquid and the liquid intramolecular friction form damping force to vibration, so that the vibration energy of the vehicle body and the vehicle frame is converted into heat energy, and the heat energy is absorbed by the oil liquid and the shock absorber shell and then is dissipated into the atmosphere. Whether active or semi-active, the flow rate and path of the oil is typically varied by controlling valves to change the damping characteristics of the shock absorber. Since the control valve of the shock absorber requires accurate control of the opening of the valve, a proportional solenoid, also called a proportional valve, is usually used for the control.

The proportional valve has high requirement on the machining precision of the proportional electromagnet, and the adopted controller has a complex structure, so that the related technology is monopolized abroad, and great difficulty is brought to the localization of the proportional valve and the shock absorber. The prior art also discloses some patents on shock absorbers and control valves used therein.

Chinese patent CN 211737851U discloses an electronic control shock absorber, and the disclosed technical features thereof include: the device comprises a piston rod, an oil seal, a guide seat, a recovery valve system, a check ring, a compression valve system, an oil storage cylinder, an inner working cylinder, an outer working cylinder, an O-shaped ring, a connecting sleeve and a solenoid valve assembly; the inner working cylinder is provided with a circulation hole; one end of the inner working cylinder is pressed into a compression valve and is nested in the outer working cylinder; the check ring is riveted and fixed on the piston rod, and the recovery valve system divides the oil storage cylinder into an upper cavity and a lower cavity; an oil passage is formed between the inner working cylinder and the outer working cylinder; in the process that the piston rod is pulled outwards, the restoring valve system is limited below the flow through hole through the check ring and cannot block or pass through the flow through hole in a reciprocating mode; the circulation hole of the inner working cylinder is in the interval surrounded by the outer working cylinder; the outer working cylinder is provided with a reverse top hole; one end of the connecting sleeve is connected with the reverse top hole of the outer working cylinder, and the other end of the connecting sleeve is connected with the electromagnetic valve assembly. Although this patent can be according to the effect that the electric current size was adjusted damping force, can input different electric currents in different road conditions, improves the riding comfort and the driving safety nature of car, the valve is including recovering valve system and compression valve system, and the oil circuit is also more complicated.

Chinese patent CN 112253669 a discloses a semi-active shock absorber, which discloses technical features including: the oil cylinder assembly, the connecting rod piston assembly, the bottom valve assembly and the digital proportional valve; the oil cylinder assembly comprises an outer cylinder barrel, an inner cylinder barrel and a working cylinder; the digital proportional valve comprises a switch valve assembly and a main valve assembly; the switch valve assembly comprises a magnetic yoke iron assembly, a coil assembly, an armature push rod assembly and a pilot valve spring, wherein the armature push rod assembly and the coil assembly are arranged in the magnetic yoke iron assembly, the armature push rod assembly is in sliding fit with the magnetic yoke iron assembly, the coil assembly can push the armature push rod assembly to move along the axial direction of the magnetic yoke iron assembly when being electrified, and the pilot valve spring provides restoring force for the armature push rod assembly to restore to the initial position; the main valve assembly is provided with a first oil way and a second oil way, the oil inlet ends of the first oil way and the second oil way are respectively communicated with the middle cavity, and the oil outlet ends of the first oil way and the second oil way are respectively communicated with the oil storage cavity; when the coil assembly is not electrified, the first oil way is in a connected state, the second oil way is in a disconnected state, and the intermediate cavity is communicated with the oil storage cavity through the first oil way; when the coil assembly is electrified, the armature push rod assembly blocks the first oil way, the first oil way is in a disconnected state, and the intermediate cavity is communicated with the oil storage cavity through the second oil way. From the above, the proportional valve of this patent includes a switching valve assembly and a main valve, and both the first oil passage and the second oil passage are located at the main valve. Although the patent can continuously and randomly adjust the throttling area of the proportional valve by controlling the duty ratio of the input signal, the continuous adjustment and control of the damping force of the shock absorber are realized. However, the valve design and the oil path structure of the patent are very complicated; this places high demands on the precision of manufacturing and the complex oil circuit and control structure are relatively prone to failure.

Disclosure of Invention

The invention aims to solve the technical problem that on the premise of keeping the adjustable damping characteristic, the complex control valve structure in the existing shock absorber is simplified, so that the shock absorber is easy to produce and manufacture, and the possibility of faults in the operation process is reduced. Further analysis shows that the complicated valve structure inevitably leads to the control valve being large in size, which results in a crowded chassis space of the automobile.

In order to solve one or more technical problems, the invention provides a push rod circulation hole type shock absorber, which comprises a shock absorber body and a control valve, wherein the shock absorber body comprises an outer cylinder, a middle cylinder and an inner cylinder; wall holes are arranged on the wall of the inner cylinder to communicate the inner chamber with the middle chamber; a first flow guide body is arranged in the middle cavity, and a first through hole is formed in the first flow guide body; a second flow guide body is arranged in the outer cavity and provided with a second through hole; the control valve comprises a push rod and a control assembly for controlling the movement of the push rod; the head of the push rod is provided with a circulation hole, the head of the push rod is embedded between the first flow guide body and the second flow guide body, so that the first through hole, the circulation hole and the second through hole form a flow channel for communicating the middle chamber with the outer chamber, and the opening degree of the flow channel is controlled through the movement of the push rod.

The shape of the wall hole on the wall of the inner cylinder is not limited, and the wall hole can be a round hole, a square hole and the like. The wall openings serve to communicate the inner chamber with the middle chamber, and fluid can flow from the inner chamber to the middle chamber, or from the middle chamber to the inner chamber, through the wall openings. Typically, the fluid contained within each cylinder of the shock absorber body is oil.

The structure of the first flow guiding body and the second flow guiding body can be various, such as a sheet shape, a block shape and the like, but the key point is that a through hole capable of guiding the flow is used for guiding the fluid out, and the flow guiding effect of the flow guiding body can be realized just because of the existence of the through hole capable of guiding the fluid out. For the structure of the flow guiding body, the whole first flow guiding body is not required to be completely arranged in the middle cavity, the second flow guiding body is not required to be completely arranged in the outer cavity, and the flow guiding body is arranged in the middle cavity or the outer cavity only by judging whether the position of the through hole on the flow guiding body is positioned in the middle cavity or the outer cavity.

The specific structures of the first flow guide body and the second flow guide body are not limited, and the invention only needs to ensure that the first through hole can lead out the fluid in the middle cavity and the second through hole can lead out the fluid in the outer cavity. Therefore, the first flow guiding body does not need to be completely fixed in the middle cavity, for example, in order to fix the first flow guiding body better, the edge of the first flow guiding body can be fixed on the outer cylinder wall through the outer cavity; similarly, the edge of the second flow guide body can be fixed on the inner cylinder wall through the middle cavity.

Since the moving direction of the fluid is changed, the function of the fluid guide is not limited to guiding the fluid out, and the fluid may be guided in from the fluid guide.

The push rod in the control valve of the invention is a rod piece, and the two ends of the rod piece are respectively provided with a head part and a tail part, and the head part and the tail part can be interchanged usually. It is not possible to define one end of the push rod as the head and the other end as the tail. In the present invention, the end embedded between the first flow guiding body and the second flow guiding body is defined as the head of the push rod, and it is obvious that the flow hole is also located at the head of the push rod.

The present invention defines the through hole of the head of the push rod as the flow hole in order to distinguish from the first through hole and the second through hole. The first through hole and the second through hole are respectively positioned on the first flow guide body and the second flow guide body and actually play a role in flow guide. The key point of realizing different damping of the shock absorber is that the first through hole, the second through hole and the circulating hole form a flow passage for communicating the middle chamber with the outer chamber. The flow passage of the invention has no valve with the traditional structure, but the purpose of controlling the flow can be realized by utilizing the movement of the push rod, thereby realizing the same effect as the valve.

When the flow passage is completely opened, one end of the through hole is communicated with the first through hole, the other end of the through hole is communicated with the second through hole, and the first through hole is positioned in the middle chamber, and the second through hole is positioned in the outer chamber, so that the through hole is usually designed into an inclined hole.

The first through hole, the flow hole and the second through hole are not provided with valves with traditional structures, and the control principle of a flow passage is as follows generally: the first flow guide body and the second flow guide body are fixed, the first through hole and the second through hole are located, the circulation hole can move along with the push rod, the first through hole, the second through hole and the same aperture are not assumed, when the push rod moves to enable the circulation hole to be aligned with the first through hole and the second through hole, the opening degree of the flow channel is the largest at the moment, when the push rod moves to enable the circulation hole to be staggered with the first through hole and the second through hole, the opening degree of the flow channel is the smallest (closed) at the moment, and when the push rod moves to enable the circulation hole to be partially aligned with the first through hole and the second through hole, the opening degree of the flow channel is moderate at the moment. For the purpose of accurately controlling the opening degree of the flow passage, it is necessary that the opening degree of the flow passage can be adjusted, i.e., the control valve of the present invention should preferably be a proportional valve.

In order to enable the opening degree of the flow passage to be adjusted between the minimum opening degree and the maximum opening degree at will, the push rod needs to be fixed at any opening degree and kept in stress balance. As a preferred embodiment, the present invention may be provided with a first spring at the rear of the push rod, the first spring providing a pushing force opposite to the electromagnetic force for balancing the electromagnetic force. Of course, the first spring may be disposed at other positions, such as the head of the push rod, and the restoring force provided by the first spring may be a pushing force or a pulling force, and only the restoring force provided by the first spring needs to be kept opposite to the electromagnetic force. Meanwhile, a member having a function similar to that of the first spring may be provided.

Of course, as another embodiment of the present invention, the first spring may not be provided at one end of the push rod, and it is necessary to improve the precision of the control part to directly control the push rod of the solenoid valve by inputting current and adjusting the direction and magnitude of the electromagnetic force.

As a preferred embodiment of the present invention, the first flow guiding body is located above the second flow guiding body, and when the flow channel is opened, the upper end of the flow hole is communicated with the first through hole, and the lower end of the flow hole is communicated with the second through hole. Similarly, as a similar inventive concept, the first flow guide body can be positioned below the second flow guide body, when the flow channel is opened, the upper end of the circulation hole is communicated with the second through hole, and the lower end of the circulation hole is communicated with the first through hole.

It can be seen from the above description that in brief, the flow passage associated with the control valve of the present invention is composed of a first through hole, a second through hole, and a plurality of sealing members, such as rubber gaskets, may be disposed between the first through hole, the second through hole, and the second through hole, so as to ensure the sealing between the first through hole and the second through hole, and between the second through hole and the second through hole.

The length of the flow channel is very short, and only one flow channel is needed. The flow hole is positioned between the first through hole and the second through hole, namely, when the flow channel is opened, the whole flow channel is regarded as being in a space surrounded by the outer cylinder of the shock absorber, a valve similar to a control flow channel is arranged on the inner side of the outer cylinder of the shock absorber, and a control part of the control valve is arranged on the outer side of the outer cylinder of the shock absorber. Generally, a control valve of the shock absorber is designed with a complicated oil path structure, and more than one control valve is designed, so that the control of the fluid flow can be realized by one extremely short flow passage of the invention, which is obviously different from the structure of the conventional shock absorber.

The position of the flow hole is just in the space surrounded by the outer cylinder of the shock absorber, and the control component of the control valve only needs to be arranged in a shell with a small volume to realize the control of the fluid flow.

As a preferred technical solution, the damper body is vertically arranged, and the push rod is horizontally arranged; as a similar technical concept, the push rod may have a certain inclination angle, and in this case, the opening degree of the flow passage may also be adjusted. The inclination angle cannot be too large, and the realization of the function of the push rod for adjusting the flow of the flow channel cannot be influenced by the inclination angle between 0 and 30 degrees. Preferably, however, the present invention still controls the opening degree of the flow passage by moving the push rod in the horizontal direction. Wherein, the above "inclination angle" refers to the included angle between the push rod and the horizontal plane.

As a preferable technical solution, for a control assembly of the control valve, the control assembly can be simply divided into a stator and a mover, the stator is a fixed part, and the mover is a movable part, and the purpose of the movement of the mover in the present invention is to drive the push rod to move.

The control assembly comprises a stator and a rotor, the stator comprises a coil and a magnetic yoke, and the push rod is fixed on the rotor; the tail part of the push rod is provided with a first spring, and the movement of the push rod is controlled by the restoring force of the first spring and the electromagnetic force generated by electrifying the coil so as to control the opening of the flow passage.

As a preferable installation manner, the rotor is located inside the coil of the stator, the rotor includes a permanent magnet and cover plates located at two ends of the permanent magnet, and the push rod is fixed on the cover plates. Specifically, the push rod can be fixed on the cover plate through a self-locking nut, so that the push rod is bound with the rotor and moves along with the rotor.

As a preferable scheme, the shock absorber body further comprises a piston assembly, the piston assembly comprises a piston rod and a piston, the piston is located in the inner cylinder and divides the inner chamber into an upper chamber and a lower chamber, and the piston rod assembly comprises a channel which is located on the piston and used for communicating the upper chamber with the lower chamber; the shock absorber body further includes a passage for communicating the lower chamber with the outer chamber.

Preferably, the piston is provided with two channels for communicating the upper chamber with the lower chamber, namely a first channel and a second channel; the first channel and the second channel are respectively provided with a one-way valve I and a one-way valve II, the one-way valve I only enables fluid to flow from the lower chamber to the upper chamber, the one-way valve II only enables fluid to flow from the upper chamber to the lower chamber, and the one-way valve II is a one-way damping valve.

Preferably, the two passages for communicating the lower chamber and the outer chamber are respectively a third passage and a fourth passage, the third passage and the fourth passage are located at the bottom of the inner cylinder, the third passage and the fourth passage are respectively provided with a third check valve and a fourth check valve, the third check valve can only enable fluid to flow from the outer chamber to the lower chamber, the fourth check valve can only enable fluid to flow from the lower chamber to the outer chamber, and the fourth check valve is a one-way damping valve.

Wherein, check valve and one-way damping valve are prior art, promptly select current check valve and one-way damping valve can. The one-way valve only allows the fluid to flow along the liquid inlet, but the fluid at the liquid outlet cannot flow back. Check valves are also known as check valves or check valves. The one-way damping valve is also a one-way valve, and the damping of the one-way damping valve can be overcome only when fluid flows along the liquid inlet and needs to reach a certain pressure, and the one-way damping valve can be opened.

Preferably, the wall hole is located on the wall of the upper chamber or the lower chamber. Taking the wall hole on the wall of the upper chamber as an example, when the wall hole is on the wall of the upper chamber, if the flow channel is opened, the fluid can flow from the inner chamber to the outer chamber and then back to the inner chamber to form a complete flow path. More preferably, the wall apertures are located on the wall of the upper chamber rather than the wall of the lower chamber.

Since the piston can move up and down, that is, the volume of the upper chamber or the lower chamber can also change at any time, obviously, the wall hole cannot be blocked by the up-and-down movement of the piston, and then the wall hole should be designed outside the limit stroke interval of the piston, for example, on the side wall close to the top end of the inner cylinder or close to the bottom end of the inner cylinder.

As a preferred scheme, the bottom of the piston rod assembly is provided with a limiting block, and a second spring is arranged between the limiting block and the piston. When the limiting block moves to the bottom of the inner cylinder, the limiting block is subjected to the reaction force of the bottom of the cylinder to cause the spring above the limiting block to contract, so that buffering is formed. The limiting block and the second spring are used for avoiding the piston from causing overlarge impact on the bottom of the inner cylinder.

The working principle of the shock absorber of the invention is as follows: the inner chamber and the middle chamber of the shock absorber are filled with shock absorber liquid, the outer chamber is filled with part of shock absorber liquid and part of gas, and the shock absorber liquid flows among the inner chamber, the middle chamber and the outer chamber in the process that the piston rod moves up and down in the inner chamber, so that damping is generated. The first through hole and the second through hole on the first flow guide body and the second flow guide body and the flow hole on the push rod form a flow channel for liquid to flow, the flow channel is connected with the middle chamber and the outer chamber, the size of the flow channel is determined by the position of the push rod of the control valve, and different damping can be generated when liquid passes through the flow channel, so that the function of adjusting the damping is realized.

In certain preferred embodiments, the present invention illustrates the fluid flow in a shock absorber of the present invention in both an upward and downward motion of the piston rod of the shock absorber, respectively.

When the shock absorber is in a compression (downward movement) stroke, the piston rod moves downward, the one-way valve I of the first passage in the piston is opened, the one-way valve II of the second passage is closed, and liquid moves from the lower chamber of the inner chamber to the upper chamber. When the piston is depressed to some extent, the resulting damping causes the one-way valve four (one-way damping valve) of passage four in the bottom of the cartridge to open and liquid moves from the lower chamber to the outer chamber. Meanwhile, the liquid in the outer chamber flows to the middle chamber through a flow channel formed by the second through hole, the circulation hole and the first through hole and continues to flow to the upper chamber of the inner chamber through the wall hole.

When the shock absorber is in a stretching (upward movement) stroke, the piston rod moves upward, the check valve III of the channel III in the bottom of the inner cylinder is closed, the check valve III of the channel III is opened, and the liquid moves from the outer chamber to the lower chamber. When the piston is pressed upwards to a certain degree, the generated damping enables the second one-way valve of the second channel to be opened, and liquid moves from the upper chamber of the inner chamber to the lower chamber. Meanwhile, the liquid in the upper cavity flows to the middle cavity from the wall hole and then enters the outer cavity through a flow passage formed by the first through hole, the second through hole and the flow passage.

The final purpose of the movement of the liquid of the shock absorber is to make the upper and lower chambers of the piston reach the same pressure, and the size of the flow passage through which the liquid flows influences the speed of reaching the same pressure, so different damping forces are generated. The second check valve and the fourth check valve are one-way damping valves, and can be opened when the pressure difference reaches a certain value, so that the trend of damping force change is changed, and the control valve adjusts different flow passages according to different requirements, so that the damping is variable.

The invention has the advantages that the circulation hole designed on the head part of the push rod is matched with the through holes arranged in the middle chamber and the outer chamber to form a liquid flowing channel, and different openness is generated by the movement of the push rod, so that the shock absorber achieves different damping. The invention has the advantages of ingenious conception, simple structure of the shock absorber, easy production and manufacture, lower cost and difficult failure.

Drawings

FIG. 1 is a schematic cross-sectional view of a push rod flow orifice shock absorber;

FIG. 2 is an enlarged, fragmentary view of the damper with the maximum opening of the flow passage;

FIG. 3 is an enlarged, fragmentary view of the damper with the flow passage closed;

fig. 4 is a diagram of a control method for the operation of the push rod through hole type shock absorber.

Reference numerals:

1-a shock absorber body; 2-a control valve;

101-an outer cylinder; 102-a middle cylinder; 103-inner cylinder; 104-an outer chamber; 105-a middle chamber; 106-an inner chamber; 1061 an upper chamber; 1062 a lower chamber; 107-wall holes; 108-one-way valve three; 109-one-way valve four;

111-stream conductor one; 112-flow conductor two; 113-a first through hole; 114-via two;

121-a piston rod; 122-a piston; 123-a one-way valve I; 124-one-way valve II; 125-a stopper; 126-a second spring;

201-a push rod; 202-flow-through holes; 203-a coil; 204-front yoke; 205-back yoke; 206-front permanent magnet; 207-medium iron block; 208-rear permanent magnet; 209-front cover plate; 210-a back cover plate; 211-a first spring; 212-self-locking nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples are given.

The embodiment provides a push rod flow type shock absorber, the cross sectional structure of which is shown in fig. 1, and which comprises a shock absorber body 1 and a control valve 2, wherein the shock absorber body 1 comprises an outer cylinder 101, a middle cylinder 102 and an inner cylinder 103, a cavity enclosed by the outer cylinder 101 and the middle cylinder 102 is an outer chamber 104, a cavity enclosed by the middle cylinder 102 and the inner cylinder 103 is a middle chamber 105, and a cavity enclosed by the inner cylinder 103 is an inner chamber 106; a wall hole 107 is arranged on the wall of the inner cylinder 103 to communicate the inner chamber 106 with the middle chamber 105; it should be noted that, in order to better show the position of the wall hole 107, the position of the wall hole 107 is drawn as a blank portion in fig. 1.

A first flow guide body 111 is arranged in the middle cavity 105, and the first flow guide body 111 is provided with a first through hole 113; a second flow guiding body 112 is arranged in the outer chamber 104, and the second flow guiding body 112 is provided with a second through hole 114.

The shock absorber body 1 further comprises a piston assembly, the piston assembly comprises a piston rod 121 and a piston 122, the piston 122 is positioned in the inner cylinder 103 and divides the inner chamber 106 into an upper chamber 1061 and a lower chamber 1062, and the piston rod assembly comprises a channel which is positioned on the piston 122 and is used for communicating the upper chamber 1061 with the lower chamber 1062; the shock absorber body 1 further comprises a passage for communicating the lower chamber 1062 with the outer chamber 104; the wall holes 107 are located on the walls of the upper chamber 1061. The bottom of the piston rod assembly is provided with a limiting block 125, and a second spring 126 is arranged between the limiting block 125 and the piston 122.

The two passages on the piston 122 for communicating the upper chamber 1061 and the lower chamber 1062 are respectively a first passage and a second passage; the first channel 123 and the second channel 124 are respectively provided with a one-way valve 123 and a one-way valve 124, the one-way valve 123 only enables fluid to flow from the lower chamber 1062 to the upper chamber 1061, the one-way valve 124 only enables fluid to flow from the upper chamber 1061 to the lower chamber 1062, and the second one-way valve 124 is a one-way damping valve (i.e., the valve is opened after the damping reaches a certain magnitude).

The two passages for communicating the lower chamber 1062 with the outer chamber 104 are a third passage and a fourth passage, which are located at the bottom of the inner cylinder 103, and the third passage and the fourth passage are respectively provided with a check valve three 108 and a check valve four 109, the check valve three 108 can only enable the fluid to flow from the outer chamber 104 to the lower chamber 1062, and the check valve four can only enable the fluid to flow from the lower chamber 1062 to the outer chamber 104, wherein the check valve four 124 is a one-way damping valve (i.e., the valve is opened after the damping reaches a certain size).

The control valve 2 comprises a push rod 201 and a control component for controlling the movement of the push rod 201; the head of the push rod 201 is provided with a flow hole 202, the head of the push rod 201 is embedded between the first flow guide body 111 and the second flow guide body 112, so that the first through hole 113, the flow hole 202 and the second through hole 114 form a flow passage for communicating the middle chamber 105 and the outer chamber 104, and the opening degree of the flow passage is controlled by the movement of the push rod 202.

The first flow guiding body 111 is positioned above the second flow guiding body 112, when the flow channel is opened, the upper end of the circulation hole 202 is communicated with the first through hole 113, and the lower end of the circulation hole 202 is communicated with the second through hole 114.

In one embodiment, the push rod 201 is perpendicular to the wall of the outer cylinder 101. If the wall of the outer cylinder 101 is vertical, the opening of the flow passage is controlled by moving the push rod in the horizontal direction. If the wall of the outer cylinder 101 forms a certain angle with the vertical direction, the push rod moves in the direction perpendicular to the wall of the outer cylinder 101.

The control assembly comprises a stator and a rotor; the stator includes a coil 203, a front yoke 204, and a back yoke 205. The coil 203 is in a space enclosed by the front yoke 204 and the back yoke 205, wherein the front yoke 204, the coil 203 and the back yoke 205 form a stator portion having a through hole.

The mover is inserted into the coil of the stator, the mover includes permanent magnets (the permanent magnets include a front permanent magnet 206, a middle iron block 207 and a rear permanent magnet 208) and cover plates (the cover plates include a front cover plate 209 and a rear cover plate 210) located at two ends of the permanent magnets, and the push rod 201 is fixed on the rear cover plate 210 through a self-locking nut 212. The first spring 211 is disposed at the tail of the push rod 201, and the movement of the push rod 201 is controlled by the restoring force of the first spring 211 and the electromagnetic force generated by the coil 203 being energized, so as to control the opening of the flow channel. It should be noted that: the terms "front", "middle" and "rear" in the above-mentioned front and rear yokes, front and rear cover plates, front and rear permanent magnets, middle iron blocks, rear permanent magnets and the like are used only for distinguishing positional relationships from each other, and do not have a limiting effect.

Referring to fig. 2 and 3, specifically, the first spring 211 is a compression spring, and provides a restoring force to the left (toward the damper body), that is, when power is not supplied (no electromagnetic force is generated), the restoring force of the first spring 211 causes the push rod 201 to move to the left until the opening degree of the flow passage is maximized, and at this time, the end of the push rod 202 contacts with the outer cylindrical wall of the inner cylinder 103, so that the force balance is achieved (i.e., the state of fig. 2). If the flow channel needs to be closed, the coil 203 of the control valve 2 needs to be energized to generate electromagnetic force to push the mover to drive the push rod 201 to move rightward, and when the current is maximum (e.g., 0.8A), the push rod 201 can be pushed to the rightmost end by the electromagnetic force (as shown in fig. 3), and at this time, the electromagnetic force is balanced with the restoring force of the first spring 211, and the flow channel is completely closed.

When the current is in the intermediate state (the current is 0-0.8A), different damping sizes can be realized to meet the requirements of the whole vehicle.

The working of the shock absorber of the embodiment can be divided into two motion processes of compression and stretching, and the implementation manner of the damping force adjustment of the shock absorber in the two processes is as follows:

when the shock absorber is in a compression stroke, the piston rod 121 moves downward, the first one-way valve 123 of the first passage in the piston 122 is opened, the second one-way valve 124 of the second passage is closed, and the liquid moves from the lower chamber 1062 to the upper chamber 1061 of the inner chamber 106. When the piston 122 is depressed to some extent, the resulting damping causes the one-way valve four 109 (one-way damping valve) of passage four in the bottom of the cartridge to open and liquid moves from the lower chamber 1062 to the outer chamber 104. Meanwhile, the liquid in the outer chamber 104 flows to the middle chamber 105 through the flow channel formed by the second through hole 114, the first through hole 202 and the first through hole 113, and continues to flow to the upper chamber 1061 of the inner chamber 106 through the wall hole 107.

When the shock absorber is in a tension stroke, the piston rod 121 moves upward, the check valve four 109 of passage four in the bottom of the inner cylinder 106 closes, the check valve three 108 of passage three opens, and the liquid moves from the outer chamber 104 to the lower chamber 1062. When the piston 122 is pressed upward to some extent, the resulting damping causes the second one-way valve 124 of passage two to open and fluid moves from the upper chamber 1061 to the lower chamber 1062 of the inner chamber 106. Meanwhile, the liquid in the upper chamber 1061 flows from the wall hole 107 to the middle chamber 105, and then enters the outer chamber 104 through the flow passage formed by the first through hole 113, the second through hole 202 and the second through hole 114.

The second check valve 124 and the fourth check valve 109 are one-way damping valves, and are opened when the pressure difference reaches a certain value, so that the trend of damping force change is changed, and the control valve adjusts different flow passages according to different requirements so as to realize variable damping.

When the road surface is not flat, the piston rod can drive the piston to move, and the upper chamber and the lower chamber of the piston have pressure difference, so that liquid in the shock absorber can flow, and the final purpose of the flow is to enable the upper chamber and the lower chamber of the piston to achieve the same pressure. The size of the flow channel through which the liquid flows affects the speed at which the same pressure is reached, thus generating different damping forces.

As a specific embodiment, the method for controlling the rod flow hole type damper is as shown in fig. 4, and 3 kinds of common modes, i.e., a comfort mode, a standard mode, and a sport mode, are provided in a vehicle. Meanwhile, the shock absorber system is provided with a special suspension system sensor for acquiring a vehicle body acceleration signal and a vehicle body height signal to confirm the motion state (a compression working state or a stretching working state) of the suspension system, and the motion state (straight running, turning acceleration, braking and the like) of the vehicle is confirmed through a vehicle speed, a steering wheel and a pedal signal provided by a CAN (controller area network) bus signal. After a user selects any one mode, various signals obtained by matching with a suspension system sensor and a CAN bus are calculated through suspension damping distribution (such as a skyhook algorithm), damping forces required by four shock absorbers of the vehicle under the working condition are obtained, currents required by coils of a control valve are determined based on requirements, push rods are further pushed to achieve different flow passage sizes, and finally the function of adjustable damping is achieved, so that the requirements of the user are met.

It should be noted that, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A push rod circulation hole type shock absorber comprises a shock absorber body and a control valve, wherein the shock absorber body comprises an outer cylinder, a middle cylinder and an inner cylinder, a cavity defined by the outer cylinder and the middle cylinder is an outer cavity, a cavity defined by the middle cylinder and the inner cylinder is a middle cavity, and a cavity defined by the inner cylinder is an inner cavity;

it is characterized in that wall holes are arranged on the wall of the inner cylinder to communicate the inner chamber with the middle chamber; a first flow guide body is arranged in the middle cavity, and a first through hole is formed in the first flow guide body; a second flow guide body is arranged in the outer cavity and provided with a second through hole;

the control valve comprises a push rod and a control assembly for controlling the movement of the push rod; the head of the push rod is provided with a circulation hole, the head of the push rod is embedded between the first flow guide body and the second flow guide body, so that the first through hole, the circulation hole and the second through hole form a flow channel for communicating the middle chamber with the outer chamber, and the opening degree of the flow channel is controlled through the movement of the push rod.

2. The shock absorber according to claim 1, wherein the first flow conductor is located above the second flow conductor, and when the flow passage is opened, the upper end of the flow hole is communicated with the first through hole, and the lower end of the flow hole is communicated with the second through hole.

3. The damper according to claim 1 or 2, wherein the opening degree of the flow passage is controlled by moving the push rod in the horizontal direction.

4. A damper according to claim 1 or 2, wherein the control assembly comprises a stator and a mover, the stator comprising a coil and a yoke, the push rod being fixed to the mover; the tail part of the push rod is provided with a first spring, and the movement of the push rod is controlled by the restoring force of the first spring and the electromagnetic force generated by electrifying the coil so as to control the opening of the flow passage.

5. The damper according to claim 4, wherein the mover is located inside the coil of the stator, the mover includes a permanent magnet and cover plates located at both ends of the permanent magnet, and the push rod is fixed to the cover plates.

6. The shock absorber according to claim 1 or 2, wherein the shock absorber body further comprises a piston assembly, the piston assembly comprising a piston rod and a piston, the piston being located in the inner tube and dividing the inner chamber into an upper chamber and a lower chamber, the piston rod assembly comprising a passage on the piston for communicating the upper chamber and the lower chamber; the shock absorber body further includes a passage for communicating the lower chamber with the outer chamber.

7. The shock absorber according to claim 6, wherein the passages in the piston for communicating the upper chamber with the lower chamber comprise two, passage one and passage two, respectively; the first channel and the second channel are respectively provided with a one-way valve I and a one-way valve II, the one-way valve I only enables fluid to flow from the lower chamber to the upper chamber, the one-way valve II only enables fluid to flow from the upper chamber to the lower chamber, and the one-way valve II is a one-way damping valve.

8. The shock absorber according to claim 6, wherein the passages for communicating the lower chamber with the outer chamber include two passages, three and four, which are located at the bottom of the inner tube, and the three and four passages are provided with a check valve three and a check valve four, respectively, the check valve three only allows fluid to flow from the outer chamber to the lower chamber, and the check valve four only allows fluid to flow from the lower chamber to the outer chamber, wherein the check valve four is a check damper valve.

9. The shock absorber according to claim 6, wherein said wall hole is located on a wall of the upper or lower chamber.

10. The shock absorber as set forth in claim 6, wherein a stopper is provided at a bottom of said piston rod assembly, and a second spring is installed between the stopper and the piston.