KR102671509B1 - Shock absorber - Google Patents

Abstract

The present invention varies the moving cross-sectional area of the fluid step by step according to the strength of the compression stroke caused by external shock during driving, buffers the impact by elastic force during the compression stroke beyond a set distance, and reduces the moving cross-sectional area of the fluid. It relates to a shock absorber that can implement step-by-step damping force according to the amount of shock transmitted from the road surface during the compression stroke and can improve riding comfort and steering stability by buffering the shock during the compression stroke at extremely low speeds.

Description

Shock absorber {SHOCK ABSORBER}

The present invention relates to a shock absorber, and more specifically, it can implement a gradual damping force according to the amount of shock transmitted from the road surface during the compression stroke, and can cushion the shock during the compression stroke at extremely low speeds, thereby improving ride comfort and steering stability. This is about a shock absorber that can be used.

Generally, a shock absorber is a shock absorber that is installed between an axle and a vehicle body to improve riding comfort by absorbing vibration or shock that the axle receives from the road surface when the vehicle is running.

This conventional shock absorber includes a cylinder in which fluid (oil, etc.) is stored inside, a piston rod whose one end is inserted into the inside of the cylinder while connected to the vehicle body, and a piston rod that is connected to one end of the piston rod and is inserted into the inside of the cylinder. It is divided into a compression chamber and a tension chamber, and a piston valve is configured to generate damping force during the compression and tension strokes.

In addition, a conventional shock absorber consists of a body valve installed at the bottom of the compression chamber to generate damping force during the compression stroke, and a bumper rubber installed on the piston rod to cushion the impact between the cylinder and the upper structure.

However, the conventional shock absorber has a structure that generates the damping force of the piston valve and body valve during the compression stroke and absorbs shock using a bumper rubber. The bumper rubber is exposed to the upper part of the cylinder while coupled to the piston rod, thereby damaging the device. It was bulky, which made it difficult to secure installation space when installing it.

In addition, the conventional shock absorber has a structure in which friction noise (squeak noise) is generated due to the slip of the bumper rubber and the piston rod, and contact noise is generated due to the contact between the bumper rubber and the cylinder and upper structure. It was.

In addition, the conventional shock absorber controls the damping force using the disc of the body valve during the compression stroke at low speeds, but has a structure in which it is difficult to control the damping force when the compression stroke is performed at extremely low speeds.

Prior literature related to the present invention includes Patent Publication No. 20-1998-044980 (September 25, 1998), which discloses a bumper rubber structure of a shock absorber.

The purpose of the present invention is to change the cross-sectional area of the fluid in stages according to the length of the compression stroke caused by external shock during driving, and to buffer the shock using the compression elastic force of the spring during the compression stroke beyond the set distance and to allow the fluid to move. By reducing the cross-sectional area of the inlet hole, a step-by-step damping force can be realized according to the amount of shock transmitted from the road surface during the compression stroke, and a shock absorber can improve riding comfort and steering stability by buffering the shock during the compression stroke at extremely low speeds. It is provided.

A shock absorber according to the present invention includes a cylinder filled with fluid, a piston valve that divides the interior of the cylinder into a compression chamber and a tension chamber, and a body valve installed at the bottom of the compression chamber, wherein the body valve A tube is coupled to the upper end of the tube, and has a guide hole formed therein to communicate with the lower passage of the body valve, and has a plurality of inlet holes arranged on the side along the vertical direction so that the fluid in the compression chamber moves to the guide hole; It is inserted into the upper end of the guide hole to enable elevation, is lowered by contact with the piston valve when the piston valve is lowered beyond a set length, and opens and closes to adjust the open cross-sectional area of the inlet hole to be inversely proportional to the lowered length of the piston valve. It is characterized by comprising a member and a return spring that applies a compressive elastic force inside the guide hole to raise the opening and closing member, and is compressed downward when the opening and closing member is lowered to reduce its length.

Here, it is preferable that a plurality of the inflow holes are arranged at a distance from each other along the vertical direction of the tube.

Additionally, it is preferable that a plurality of the inlet holes are arranged at a distance from each other along the circumferential direction of the tube.

In addition, the lower end of the opening and closing member is preferably inserted through the upper end of the guide hole, and the upper end protrudes into the upper part of the guide hole.

In addition, a main lifting member is further provided at the lower end of the opening and closing member to be capable of being raised and lowered, and the main lifting member is elastically supported at its lower end by the return spring, and has a side surface in close contact with the inner peripheral surface of the inner hole to increase the open cross-sectional area of the inflow hole. It is desirable to adjust it.

In addition, the opening and closing member communicates upwardly through an upper part of the auxiliary guide hole with an auxiliary guide hole formed to have a certain width inside, and an auxiliary valve that is in close contact with the piston valve and is sealed when the piston valve is lowered beyond a set length. An auxiliary lifting member is installed to be able to be raised and lowered inside the inlet hole and the auxiliary guide hole, and is lowered by the pressure of the fluid flowing in through the auxiliary inlet hole during the compression stroke, and a compression elastic force is applied inside the auxiliary guide hole to It is preferable to provide a low-speed spring that raises the auxiliary lifting member and compresses it downward when the auxiliary lifting member is lowered, thereby reducing its length.

In addition, the auxiliary inlet hole is formed to have a smaller diameter than the auxiliary guide hole to form a step between the auxiliary guide hole and the auxiliary guide hole, and when the auxiliary lifting member is raised to its maximum height, the upper edge portion is the lower end of the step. It is desirable to be positioned in the jammed position.

In addition, it is preferable that the auxiliary lifting member is raised to its maximum height when the lower end of the piston valve and the upper end of the auxiliary inlet hole come into close contact.

On the other hand, the shock absorber according to the present invention includes a cylinder filled with fluid, a piston valve that is coupled to one end of the piston rod and divides the inside of the cylinder into a compression chamber and a tension chamber, and a body valve at the bottom of the compression chamber. In the shock absorber provided, a bumper rubber is installed on the upper part of the cylinder in a state coupled to the piston rod and cushions the impact between the upper end of the cylinder and the upper structural member, and is coupled to the upper end of the body valve, Inside, a guide hole is formed to communicate with the lower passage of the body valve, and on the side, a tube is arranged with a plurality of inlet holes in the vertical direction to allow fluid in the compression chamber to move to the guide hole, and a tube is raised and lowered at the top of the guide hole. An opening and closing member that can be inserted, is lowered by contact with the piston valve when the piston valve is lowered beyond a set length, and adjusts the open cross-sectional area of the inlet hole to be inversely proportional to the lowered length of the piston valve, and The opening and closing member is positioned upward by applying a compressive elastic force from the inside, and includes a return spring that is compressed downward and shortens the length when the opening and closing member is lowered.

The present invention can implement a stepwise damping force according to the amount of shock transmitted from the road surface during the compression stroke, and can buffer the shock during the compression stroke at extremely low speeds, thereby improving riding comfort and steering stability.

In addition, the present invention has the effect of preventing the volume of the device from becoming excessively large by disposing a bumper structure inside the cylinder that can cushion the impact during the compression stroke beyond a certain stroke.

1 is a front cross-sectional view showing a shock absorber according to the present invention.
Figure 2 is a front cross-sectional view showing the compression stroke state of the shock absorber according to the present invention.
Figure 3 is a front cross-sectional view showing a state in which the piston valve is lowered beyond a set length during the compression stroke of the shock absorber according to the present invention.
Figure 4 is an exploded perspective view showing the shock absorber according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

The advantages and features of the present invention and how to achieve it will become clear by referring to the embodiments described in detail below along with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms, but the present embodiments only serve to ensure that the disclosure of the present invention is complete and are within the scope of common knowledge in the technical field to which the present invention pertains. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

Additionally, in describing the present invention, if it is determined that related known techniques may obscure the gist of the present invention, detailed description thereof will be omitted.

Figure 1 is a front cross-sectional view showing the shock absorber according to the present invention, and Figure 2 is a front cross-sectional view showing the compression stroke state of the shock absorber according to the present invention.

In addition, Figure 3 is a front cross-sectional view showing a state in which the piston valve is lowered beyond a set length during the compression stroke of the shock absorber according to the present invention, and Figure 4 is an exploded perspective view showing the shock absorber according to the present invention. .

As shown in Figures 1 to 4, the shock absorber according to the present invention includes a cylinder 10 filled with fluid, and a piston that divides the interior of the cylinder 10 into a compression chamber 11 and a tension chamber 12. A valve 20 is provided.

In addition, a piston rod 30, one end of which is inserted through the upper end of the cylinder 10 and coupled to the piston valve 20, and a body valve 50 are provided at the lower part of the compression chamber 11.

Additionally, a bumper rubber (not shown) may be further installed on the piston rod 30 extending to the top of the cylinder 10 to cushion the impact between the cylinder 10 and the upper structure.

In particular, the shock absorber according to the present invention includes a tube 100, an opening and closing member 200, and a return spring 300 installed inside the cylinder 10.

First, the cylinder 10 may have a cylindrical shape forming a space inside, and the inside of the cylinder 10 is filled with a working fluid (oil, etc.).

Additionally, the interior of the cylinder 10 can be divided into an upper tension chamber 11 and a lower compression chamber 12 by a piston valve 20, which will be described later.

The piston valve 20 divides the inside of the cylinder 10 into a compression chamber 11 and a tension chamber 12, and the piston valve 20 moves back and forth inside the cylinder 10 and responds to the resistance force of the fluid. generates damping force.

For example, when the piston valve 20 performs a compression stroke, the pressure of the lower compression chamber 11 increases more than that of the upper tension chamber 12.

At this time, due to an increase in pressure in the compression chamber 11, the working fluid charged in the compression chamber 11 moves to the tension chamber 12 through the passage of the piston valve 20 by pushing the valve means to open.

Conversely, when the piston valve 20 performs a tension stroke, the working fluid filled in the tension chamber 11 moves to the compression chamber 12 through the passage of the piston valve 20 by pushing the valve means open.

One end of the piston rod 30 is coupled to the piston valve 20, and the opposite end extends outside the cylinder 10 and is connected to the vehicle body or wheel side.

The body valve 40 is intended to generate damping force during the compression stroke and is installed at the bottom of the compression chamber 11, and a hydraulic chamber 43 is formed at the bottom of the body valve 40.

Here, the body valve 40 is formed with a lower passage 41 for moving the working fluid of the compression chamber 11 to the hydraulic chamber 43.

In addition, one or more disks 42 are coupled to the upper and lower portions of the body valve 40 to generate damping force by opening and closing the lower passage 41.

For example, when the piston rod 30 and the piston valve 20 perform a compression stroke, the fluid in the compression chamber 11 moves to the hydraulic chamber 43 through the passage of the body valve 40.

The tube 100 is vertically coupled to the top of the body valve 40 within the compression chamber 11, and the tube 100 has an inner circumferential surface and an outer circumferential surface length up and down so as to form a circumference along the horizontal direction. It has a cylindrical shape.

Here, inside the tube 100, a guide hole 110 is formed to communicate in the vertical direction, and the lower end of the tube 100 has a lower portion of the guide hole 110 connected to the lower passage 41 of the body valve 40. It is coupled to surround the top of the body valve 40 so as to communicate with.

Also, an inlet hole 120 is formed horizontally through the side of the tube 100 so that the fluid in the compression chamber 11 can flow into the guide hole 110.

The inlet holes 120 may be arranged in a plurality spaced apart manner along the vertical direction, and the number of the inlet holes 120 can be applied in various ways.

In addition, the inlet hole 120 may be arranged in at least one horizontal direction along the circumferential direction of the tube 100.

Here, the shape and diameter of the inlet hole 120 can be applied in various ways, and the position of the inlet hole 120 can be applied in various ways.

That is, when the number and cross-sectional area of the inlet holes 120 are increased, the flow rate of the working fluid flowing into the guide hole 110 increases.

On the other hand, when the number of open inlet holes 120 and the cross-sectional area decrease, the flow rate of the working fluid flowing into the guide hole 110 decreases.

Additionally, the tube 100 may have a cylindrical shape, and the side surface of the tube 100 is spaced apart from the inner peripheral surface of the cylinder 10 at a certain interval.

That is, fluid in the compression chamber 11 may flow in through the entrance side of the inlet hole 120 through the gap between the tube 100 and the cylinder 10.

The opening and closing member 200 is inserted into the upper end of the guide hole 110 to enable elevation. The opening and closing member 200 may have a cylindrical shape corresponding to the inner peripheral surface of the tube 100.

Here, the side of the opening and closing member 200 is raised and lowered in close contact with the inner peripheral surface of the guide hole 110, and the lower end of the opening and closing member 200 is inserted through the upper end of the guide hole 110, and the opening and closing member 110 is inserted into the opening and closing member 200. The upper end of the member 200 protrudes above the guide hole 110.

In more detail, an auxiliary guide hole 210 and an auxiliary inlet hole 220 may be further formed in the opening and closing member 200, and the opening and closing member 200 may include an auxiliary lifting member 230 and a low-speed spring. (240) may be further provided.

First, the auxiliary guide hole 210 is formed to have a certain area inside, and the auxiliary guide hole 210 can be opened to the bottom of the opening and closing member 200.

The auxiliary guide hole 210 forms a space for installing a low-speed spring 240 and an auxiliary lifting member 230, which will be described later, and a space for forming a damping force.

The auxiliary inlet hole 220 is formed to communicate upward through the upper part of the auxiliary guide hole 210. The auxiliary inlet hole 220 is used to connect the piston valve 20 when the piston valve 20 is lowered beyond the set length. It is closed and adheres closely to the bottom of the.

Here, the auxiliary inlet hole 220 is formed to have a smaller diameter than the auxiliary guide hole 210, and a step 250 is formed between the auxiliary inlet hole 220 and the auxiliary inlet hole 220.

For example, when the auxiliary lifting member 230, which will be described later, is raised to its maximum height, the upper edge of the auxiliary lifting member 230 is positioned at the bottom of the step 250, as shown in FIGS. 1 and 3.

The auxiliary lifting member 230 is installed to enable elevation in a shape corresponding to the inside of the auxiliary guide hole 210. The auxiliary lifting member 230 is used to control fluid flowing in through the auxiliary inlet hole 220 during the compression stroke. is lowered by the pressure of

Here, when the auxiliary lifting member 230 is raised to its maximum height as described above, the upper edge portion of the auxiliary lifting member 230 is caught at the lower end of the step 250.

At this time, the auxiliary lifting member 230 closes the lower end of the auxiliary inlet hole 220 while being caught on the step 250 as shown in FIGS. 1 and 3.

Additionally, the edge portion of the auxiliary lifting member 230 may be spaced apart from the inner peripheral surface of the auxiliary guide hole 210 at a certain interval to allow fluid to move.

When the auxiliary lifting member 230 is raised to its maximum height, its upper edge is caught at the bottom of the step 250.

On the other hand, the auxiliary lifting member 230 is raised to its maximum height when the lower end of the piston valve 20 and the upper end of the auxiliary inlet hole 220 are in close contact.

The low-speed spring 240 is intended to provide compressive elastic force inside the auxiliary guide hole 210, and elastically supports the lower end of the auxiliary lifting member 230.

Here, the low-speed spring 240 is preferably in the form of a coil spring to provide compression elastic force, but the low-speed spring 240 can optionally be used in various forms.

That is, the low-speed spring 240 applies a compressive elastic force inside the auxiliary guide hole 210 to raise the auxiliary lifting member 230, and when the auxiliary lifting member 230 is lowered, it is compressed downward and lengthened. is reduced.

In addition, a main lifting member 400 is installed at the lower end of the opening and closing member 200 in a corresponding shape to be capable of being raised and lowered, and the lower end of the main lifting member 400 is elastically supported by a return spring 300.

Here, the upper end of the main lifting member 400 is in close contact with the lower end of the opening and closing member 200, and the edge portion is in close contact with the inner peripheral surface of the guide hole 110, as shown in FIG. 3.

The main lifting member 400 is lowered in close contact with the lower end of the opening and closing member 200 during the compression stroke, and adjusts the open cross-sectional area of the inlet hole 120 according to the height lowered during the compression stroke.

The return spring 300 applies a compressive elastic force inside the guide hole as shown in FIGS. 1 and 2 to raise the opening and closing member 200, and when the opening and closing member 200 is lowered, it is compressed downward as shown in FIG. 3 and its length is reduced. do.

Here, the return spring 300 is preferably in the form of a coil spring to provide compression and tension elastic force, but the return spring 300 can optionally be used in various forms.

As a result, the present invention can implement a stepwise damping force according to the amount of impact transmitted from the road surface during the compression stroke, and can cushion the shock during the compression stroke at extremely low speeds, improving riding comfort and steering stability.

In addition, the present invention can prevent the volume of the device from becoming excessively large by arranging a bumper structure inside the cylinder that can cushion the impact during the compression stroke beyond a certain stroke.

In addition, the present invention can prevent the volume of the device from becoming excessively large by disposing a bumper structure inside the cylinder 10 that can cushion the impact during the compression stroke beyond a certain stroke.

Although specific embodiments of the shock absorber of the present invention have been described so far, it is obvious that various implementation modifications are possible without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the claims and equivalents thereof as well as the claims described later.

That is, the above-described embodiments should be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims and All changes or modified forms derived from the equivalent concept should be construed as falling within the scope of the present invention.

10: cylinder 11: compression chamber
12: Tensile chamber 20: Piston valve
30: Piston rod 40: Body valve
41: lower passage 42: disk
43: Hydraulic chamber 100: Tube
110: guidance hole 120: inflow hole
200: Opening and closing member 210: Auxiliary guide hole
220: Auxiliary inlet hole 230: Auxiliary lifting member
240: low speed spring 250: step
300: return spring 400: main lifting member

Claims (9)

A shock absorber comprising a cylinder filled with fluid, a piston valve that divides the interior of the cylinder into a compression chamber and a tension chamber, and a body valve provided at the bottom of the compression chamber,
A tube coupled to the upper end of the body valve, inside which a guide hole is formed to communicate with the lower passage of the body valve, and on a side of which an inflow hole is arranged along the vertical direction so that the fluid in the compression chamber moves into the guide hole;
It is inserted into the upper end of the guide hole so as to be ascendable, and the upper end protrudes above the guide hole, and when the piston valve is lowered beyond a set length, it is lowered by contact with the piston valve, and is inversely proportional to the lowered length of the piston valve. An opening and closing member that adjusts the open cross-sectional area of the inlet hole; and
A shock absorber comprising a return spring that exerts a compressive elastic force inside the guide hole to raise the opening and closing member, and compresses downward and reduces the length when the opening and closing member descends. In claim 1,
The inlet hole is,
A shock absorber, characterized in that a plurality of shock absorbers are arranged spaced apart along the vertical direction of the tube. In claim 1,
The inlet hole is,
A shock absorber, characterized in that a plurality of shock absorbers are arranged in a spaced apart state along the circumferential direction of the tube. In claim 1,
The opening and closing member is,
A shock absorber whose lower end is inserted through the top of the guide hole. In claim 1,
At the bottom of the opening and closing member,
The main elevating member is further provided to enable elevating,
The main lifting member is,
A shock absorber, characterized in that the lower end is elastically supported by the return spring, and the side surface is in close contact with the inner peripheral surface of the guide hole to adjust the open cross-sectional area of the inlet hole. In claim 1,
The opening and closing member is,
An auxiliary information hall formed within a certain area,
An auxiliary inlet hole that communicates upward through the upper part of the auxiliary guide hole and is in close contact with the piston valve when the piston valve is lowered beyond a set length and is sealed;
An auxiliary lifting member that is installed to be able to be raised and lowered inside the auxiliary guide hole and is lowered by the pressure of fluid flowing through the auxiliary inlet hole during the compression stroke,
A shock absorber comprising a low-speed spring that exerts a compressive elastic force inside the auxiliary guide hole to raise the auxiliary lifting member, and compresses downward and reduces the length when the auxiliary lifting member is lowered. In claim 6,
The auxiliary inlet hole is,
It is formed with a smaller diameter than the auxiliary guide hole to form a step between the auxiliary guide hole and the auxiliary guide hole,
The auxiliary lifting member is,
A shock absorber, characterized in that the upper edge portion is positioned at the bottom of the step when raised to the maximum height. In claim 6,
The auxiliary lifting member is,
A shock absorber, characterized in that the lower end of the piston valve and the upper end of the auxiliary inlet hole are raised to the maximum height when in close contact. A shock absorber comprising a cylinder filled with fluid, a piston valve coupled to one end of a piston rod and dividing the interior of the cylinder into a compression chamber and a tension chamber, and a body valve provided at the bottom of the compression chamber,
A bumper rubber installed on the top of the cylinder while coupled to the piston rod to cushion the impact between the top of the cylinder and the upper structure;
It is coupled to the upper end of the body valve, and a guide hole is formed inside to communicate with the lower passage of the body valve, and a plurality of inlet holes are arranged on the side in the vertical direction so that the fluid in the compression chamber moves to the guide hole. tube;
It is inserted into the upper end of the guide hole so as to be ascendable, and the upper end protrudes above the guide hole, and when the piston valve is lowered beyond a set length, it is lowered by contact with the piston valve, and is inversely proportional to the lowered length of the piston valve. An opening and closing member that adjusts the open cross-sectional area of the inlet hole; and
A shock absorber comprising a return spring that exerts a compressive elastic force inside the guide hole to raise the opening and closing member, and compresses downward and reduces the length when the opening and closing member descends.