KR102347988B1 - Damping force controlling shock absorber - Google Patents

Abstract

The damping force variable shock absorber according to the present invention includes a piston rod that performs compression and tension strokes in a cylinder, and a piston that is coupled to the lower end of the piston rod to divide the cylinder into a compression chamber and a tension chamber, and a main flow path is formed through the top and bottom And, in the damping force variable shock absorber coupled between the piston rod and the piston and having a solenoid for raising and lowering the spool by magnetic force, guides it to a state surrounding the outer periphery of the spool, and the inner hollow and A spool guide having a hard flow path and a soft flow path to be connected, respectively, installed in the stroke direction of the piston, and when the soft flow path is opened, the passage is connected to the main flow path and the soft flow path to generate a damping force through the main disks a main valve, a back pressure chamber coupled to the stroke direction of the main valves, respectively, and a back pressure chamber is connected to the hard flow passage through the main flow passage and the passage when the hard flow passage is opened to generate a damping force; and in the back pressure chamber It is installed in a state of elastically supporting the stroke direction of the main disks, and a center portion fixed to the spool guide includes a plate disk spaced apart from the main disk.

Description

Damping force variable shock absorber {DAMPING FORCE CONTROLLING SHOCK ABSORBER}

The present invention relates to a damping force variable shock absorber, and more particularly, by additionally applying a directional disc spring to the main disk, it is possible to easily secure the installation space of the valve even in a limited space, and to achieve the same performance. It relates to a damping force variable shock absorber that can reduce the volume of equipment while implementing it.

In general, a shock absorber is installed in a moving means such as a vehicle, and absorbs and buffers vibrations or shocks received from the road surface during driving to improve riding comfort.

The shock absorber includes a cylinder and a piston rod installed to be compressible and expandable in the cylinder, and these cylinders and the piston rod are respectively installed on a vehicle body or a wheel or axle.

Among the shock absorbers, the shock absorber with a low damping force can absorb vibrations caused by the unevenness of the road surface during driving to improve riding comfort, whereas the shock absorber set with a high damping force suppresses changes in the body posture and improves steering stability There is this.

Therefore, by mounting a damping force variable valve that can appropriately adjust damping force characteristics on one side of the shock absorber, a damping force variable shock absorber that can appropriately adjust damping force characteristics to improve ride comfort and steering stability according to road surface and driving conditions was developed

However, in the conventional shock absorber of variable damping force, a plurality of valve disks are installed to increase the damping force, but the space for installing the valve disk is limited, so it was difficult to secure an installation space.

Therefore, there is a need for a valve disk structure that can be easily installed in a limited installation space while realizing a desired damping force.

As a prior document related to the present invention, there is Republic of Korea Patent Publication No. 1998-0002962 (March 30, 1998), the prior document discloses a damping force variable buffer valve.

It is an object of the present invention to additionally apply a directional disc spring to the main disk, so that it is possible to easily secure an installation space for the valve within a limited space, and to reduce the volume of equipment while implementing the same performance. It is to provide a damping force variable shock absorber.

In addition, another object of the present invention is to generate a hard damping force through the disk slit at low speed by adding a disk valve installed in the back pressure chamber, and when the pressure in the back pressure chamber is higher than a certain pressure, the disk valve is opened to discharge the pressure to the outside. By keeping the pressure constant, it is possible to form a harder damping force during low-speed operation, and to control the disc valve opening pressure during medium and high-speed operation to prevent deterioration of equipment durability or abnormal operation due to excessive pressure rise. It is to provide a damping force variable shock absorber.

The damping force variable shock absorber according to the present invention includes a piston rod that performs compression and tension strokes in a cylinder, and a piston that is coupled to the lower end of the piston rod to divide the cylinder into a compression chamber and a tension chamber, and a main flow path is formed through the top and bottom And, in the damping force variable shock absorber coupled between the piston rod and the piston and having a solenoid for raising and lowering the spool by magnetic force, guides it to a state surrounding the outer periphery of the spool, and the inner hollow and A spool guide having a hard flow path and a soft flow path to be connected, respectively, installed in the stroke direction of the piston, and when the soft flow path is opened, the passage is connected to the main flow path and the soft flow path to generate a damping force through the main disks a main valve, a back pressure chamber coupled to the stroke direction of the main valves, respectively, and a back pressure chamber is connected to the hard flow passage through the main flow passage and the passage when the hard flow passage is opened to generate a damping force; and in the back pressure chamber It is installed in a state of elastically supporting the stroke direction of the main disks, and the central portion fixed to the spool guide is characterized in that it includes a plate disk spaced apart from the main disk.

Here, each of the main valves is installed in the stroke direction of the piston, a first passage is formed in a central portion to be connected to the main passage, and a first passage is formed at an edge portion to be connected to the back pressure chamber, the compression chamber, and the tension chamber. A retainer in which two passages are formed, a first main disk which is respectively installed in the stroke direction of the retainers and is in close contact with the central portion of the retainers to generate a damping force in the first passage, and in the stroke direction of the first main disks It is preferable that the second main disk be provided as a second main disk which is respectively installed and is in close contact with the edge portions of the retainers to generate a damping force in the second passage.

In addition, it is preferable that the edge portion of the plate disk elastically supports the stroke direction of the first main disks, and the center portion fixed to the spool guide is convexly spaced apart from the main disk in a direction opposite to the main disk to form a curved surface. .

In addition, it is preferable that a coupling hole for penetrating coupling to the outer periphery of the spool guide is formed in the central portion of the dish disk.

In addition, one or more slits may be formed on the edge of the second main disk, and the slits may move the fluid delivered from the back pressure chamber of the back pressure chamber to the main flow path through the second passage. .

In addition, the hard flow path is formed at the positions of the retainers and the back pressure chamber, respectively, and when opened, connects the first passage, the hollow of the spool guide, and the back pressure chamber, respectively, and the soft flow path is the piston position and the It is formed in a state of sharing the hard flow path, and it is preferable to connect the first passage and the main passage when opened.

In addition, an outlet connecting the back pressure chamber to the compression chamber and the tension chamber is provided in the stroke direction of the back pressure chambers, and the outlet port is blocked in the direction of the compression chamber and the tension chamber, the pressure of the back pressure chamber A discharge valve that is opened when the pressure is higher than this set pressure may be further provided.

In addition, the discharge valve is installed in a state of blocking the discharge port in the direction of the compression chamber and the tension chamber, and when the pressure in the back pressure chamber is equal to or greater than a set pressure, one or a plurality of first discharge disks whose edge is opened; A second discharge disk may be provided to support the first discharge disks in the directions of the back pressure chambers, respectively, and to closely position the first discharge disks to the back pressure chamber.

In the present invention, by additionally applying a directional disc spring to the main disk, it is possible to easily secure an installation space for the valve within a limited space, and it has the effect of reducing the volume of equipment while implementing the same performance. .

In addition, when the pressure in the back pressure chamber is higher than a certain pressure, the disk valve is opened to release the pressure to the outside to keep the pressure constant. It has the effect of preventing deterioration or abnormal operation from occurring.

1 is a front cross-sectional view for showing the compression stroke state in the hard mode of the damping force variable shock absorber according to the present invention.
Figure 2 is a front cross-sectional view for showing the tensile stroke state in the hard mode of the damping force variable shock absorber according to the present invention.
Figure 3 is a front cross-sectional view for showing the compression stroke state in the soft mode of the damping force variable shock absorber according to the present invention.
Figure 4 is a front cross-sectional view for showing the compression stroke state in the soft mode of the damping force variable shock absorber according to the present invention.

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

Advantages and features of the present invention, and a method of achieving the same, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

However, the present invention is not limited by the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art 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.

In addition, in the description of the present invention, when it is determined that related known techniques may obscure the gist of the present invention, a detailed description thereof will be omitted.

1 is a front sectional view for showing the compression stroke state in hard mode of the damping force variable shock absorber according to the present invention, and FIG. 2 is for showing the tensile stroke state in hard mode of the damping force variable shock absorber according to the present invention It is a front sectional view.

In addition, Figure 3 is a front cross-sectional view for showing the compression stroke state in the soft mode of the damping force variable shock absorber according to the present invention, Figure 4 shows the compression stroke state in the soft mode of the damping force variable shock absorber according to the present invention It is a front sectional view for giving.

1 to 4 , the damping force variable shock absorber according to the present invention includes a cylinder 10 , a piston rod 20 , a piston valve 30 , and a solenoid 40 .

In particular, the damping force variable shock absorber according to the present invention includes a spool guide 100 , a main valve 200 , a back pressure chamber 300 , and a disc spring 400 .

Among the above configurations, the cylinder 10 may have a cylindrical shape forming a space therein, and a fluid (oil, etc.) is filled in the cylinder 10 .

Here, the cylinder may be divided into an inner tube (not shown) and an outer tube (not shown), and a body valve (not shown) may be further installed under the inner tube.

A storage chamber (not shown) divided by the body valve may be formed between the inner tube and the outer tube.

That is, the damping force variable shock absorber according to the present invention is applicable to both the single cylinder type or the double cylinder type cylinder (10).

In addition, the inside of the cylinder 10 may be divided into a compression chamber 11 and a tension chamber 12 by a piston valve 30 to be described later.

In addition, a separate coupling part (not shown) for connecting to the vehicle body side or the wheel side may be installed at the lower end of the cylinder 10 .

As such, one end of the cylinder 10 and one end of the piston rod 20 may perform compression and tension strokes in a state in which they are respectively connected to the vehicle body side or the wheel side.

One end of the piston rod 30 is coupled to the piston valve 20 , and the other end is extended to the outside of the outer tube 12 to be connected to the vehicle body side or the wheel side.

The piston 30 divides the inside of the cylinder 10 into a compression chamber 11 and a tension chamber 12 , and a main flow path 31 is formed vertically through the piston 30 .

The solenoid valve 40 selectively opens and closes the hard flow path and the soft flow path by elevating the spool to be described later in a state coupled to the piston rod 20 located inside the cylinder 10 .

For this purpose, the solenoid valve 40 may be provided with an operating chamber in which a plunger 300 to be described later is installed so as to be lifted and lowered, and a coil wound outside the operating chamber.

The coil raises and lowers the spool 41 in a soft mode or a hard mode by forming a magnetic force by the power supplied from the outside.

The spool guide 100 is installed vertically inside the cylinder 10 , and guides it up and down while enclosing the outer periphery of the spool 41 .

Here, a hollow 110 is formed inside the spool guide 100 so that the spool 41 is movable up and down.

In addition, a hard flow path 120 and a soft flow path 130 are formed in the spool guide 100 so as to be selectively opened and closed by elevating the spool 41 .

The hard flow path 120 is formed horizontally through, and is formed in a pair to correspond to the upper part and the lower part of the spool guide 100 .

That is, the hard flow path 120 may be formed at positions of retainers 210 and the back pressure chamber 300 to be described later, respectively.

As in FIGS. 1 and 2 , the hard flow path 120 connects the hollow of the spool guide 100 with the first passage 211 to be described later when the spool 41 is lowered and a back pressure chamber 310 to be described later, respectively. do.

The soft flow path 130 is horizontally formed through, and may be positioned between the hard flow paths 120 . At this time, the soft flow path 130 is formed in a state of sharing the position of the piston 30 and the hard flow path 120 located in the direction of the compression chamber 11 .

As in FIGS. 3 and 4 , the soft flow path 130 connects the first passage 211 to be described later when the spool 41 is raised and the main flow path 31 of the piston 30 .

That is, when the hard flow path 130 is opened, a hard damping force can be generated while the fluid moves to the compression chamber 11 or the tension chamber 12 through the main flow path 31 and the back pressure chamber 300 to be described later. have.

On the other hand, when the soft flow path 130 is opened, a soft damping force may be generated while the fluid moves to the compression chamber 11 or the tension chamber 12 through the main flow path 31 .

The main valve 200 is installed in the stroke direction of the piston 30 , and generates a damping force due to the resistance of the fluid during the compression and tension strokes of the piston 30 .

Here, the main valve 200 is connected to the main flow path 31 and the soft flow path 130 when the soft flow path 130 is opened to generate a damping force.

To this end, the main valve 200 may include a pair of retainers 210 , a pair of first main disks 220 , and a pair of second main disks 230 .

The retainers 210 may be respectively installed in the stroke direction of the piston 30 , and a first passage 211 may be formed in a central portion to be connected to the main passage 31 .

In addition, the retainers 210 may have a second passage 212 formed at the edge of the retainer 210 to be connected to the back pressure chamber 310 of the back pressure chamber 300 to be described later.

The first main disks 220 may have a hollow disk shape to be coupled to the spool guide 100 , and are respectively installed in the stroke direction of the retainers 210 .

As such, the first main disks 220 are in close contact with the central portions of the retainers 210 to generate a damping force in the first passage 211 .

In addition, the first main disks 220 may be coupled to the center on the spool guide 100, and may be stacked and coupled in one or a plurality.

The second main disks 230 may have a hollow disk shape to be coupled to the spool guide 100 , and are respectively installed in the stroke direction of the first main disks 510 .

As such, the second main disks 230 are in close contact with the edge portions of the retainers 210 to generate a damping force in the second passage 212 .

In addition, one or a plurality of slits 231 are formed vertically through the edge of the second main disks 230 as shown in FIG. 1 .

The slit 231 moves the fluid transferred from the back pressure chamber 310 of the back pressure chamber 300 to the main flow passage 31 through the second passage 212 .

The back pressure chamber 300 is coupled to each of the stroke directions of the main valves 200 , and is connected to the main flow path 31 and the hard flow path 120 when the hard flow path 120 is opened to generate a damping force.

At this time, the fluid that has moved to the back pressure chamber 310 of the back pressure chamber 300 through the hard flow passage 120 passes through the slot 231 and the second passage 212 of the second main disk 230 into the compression chamber ( 11) or while moving to the tension chamber 12, a hard damping force is generated.

The discharge ports 400 are respectively formed in the stroke direction of the back pressure chambers 300 , and connect the back pressure chambers 310 of the back pressure chambers 300 to the compression chamber 11 and the tension chamber 12 .

The dish disk 400 is installed in a state of elastically supporting the stroke direction of the first main disks 220 in the back pressure chamber.

In addition, in the dish disk 400 , the central portion fixed to the spool guide 100 is spaced apart from the first main disk 220 to form a spacing portion 410 .

Here, a coupling hole 420 for penetratingly coupling the spool guide 100 to the outer periphery of the spool guide 100 is formed in the central portion of the plate disk 400 .

Since the edge portion of the dish disk 400 as described above protrudes in the direction of the first main disk 220 , when the first main disk 220 retreats by the pressure of the fluid flowing into the first passage 211 , , the plate disk 400 may constantly apply an elastic force while the edge portion is retracted.

That is, since the dish disk 400 has directionality in the direction of the first main disk 220 , a large support force can be formed even with a single disk spring 400 , and since the volume is not large compared to the support force, the device volume can be reduced.

The discharge valve 600 is installed to block the discharge port 500 in the direction of the compression chamber 11 and the tension chamber 12, and the discharge valve 600 is configured such that the pressure in the back pressure chamber 310 is equal to or greater than the set pressure. case is open

The discharge valve 600 for this purpose may include a first discharge disk 610 and a second discharge disk 620 .

The first discharge disk 610 may have a disk shape with a hollow formed therein to be coupled to the spool guide 100, and block the discharge port 400 in the direction of the compression chamber 11 and the tension chamber 12. is installed

As described above, the first discharge disk 610 discharges the fluid into the compression chamber 11 or the tension chamber 12 while the edge portion is spaced apart from the back pressure chamber 300 when the pressure in the back pressure chamber 310 is equal to or greater than the set pressure. make it

The second discharge disk 620 has a disk shape with a hollow formed therein to be coupled to the spool guide 100, supports the first discharge disk 610 in the direction of the back pressure chambers 300, and the second discharge disk ( 620) is placed in close contact with one surface of the back pressure chamber 300.

Meanwhile, the discharge pressure of the back pressure chamber 310 may be adjusted by adjusting the shape and number of the second discharge disk 620 and the first discharge disk 610 .

Hereinafter, the operation of the damping force variable shock absorber according to the present invention will be described with reference to FIGS. 1 to 4 .

First, when the solenoid 40 is operated in hard mode and then the compression and tension strokes are performed, the fluid in the compression chamber 11 or the tension chamber 12 flows through the main flow path 31 of the piston 30 as shown in FIGS. 1 and 2 . ) and the first passage 211 of the main valve 200 is moved.

At this time, the fluid moving to the first passage 211 generates a main damping force while pushing up the first main disk 220 and moving to the tension chamber 12 through the second passage 212 .

At the same time, the fluid in the compression chamber 11 moves to the back pressure chamber 310 through the main passage 31 , the first passage 211 , and the hard passage 120 of the piston 30 .

Thereafter, the fluid moved to the back pressure chamber 310 moves to the compression chamber 11 or the tension chamber 12 through the slot 231 and the second passage 212 of the second main disk 230, making it hard. generate damping force.

On the other hand, when the solenoid 40 is operated in the soft mode and then the compression stroke is performed, as shown in FIG. 3 , the fluid in the compression chamber 11 flows through the main passage 31 of the piston 30 and the first passage of the main valve 200 . Go to (211).

At this time, the fluid moving to the first passage 211 moves to the tension chamber 12 through the second passage 212 while pushing up the first main disk 220 and the disc spring 400 to increase the main damping force. generate

At the same time, the fluid in the compression chamber 11 moves to the tension chamber 12 through the soft passage 130 , the first passage 211 , and the main passage 31 to generate a soft damping force.

Conversely, when the solenoid 40 is operated in the soft mode and then the tension stroke is performed, the fluid in the tension chamber 12 flows through the main passage 31 of the piston 30 and the first passage of the main valve 200 as shown in FIG. 4 . Go to (211).

At this time, the fluid moved to the first passage 211 moves to the compression chamber 11 through the second passage 212 while pushing up the first main disk 220 and the disc spring 400 to increase the main damping force. generate

At the same time, the fluid moving to the first passage 211 moves to the compression chamber 11 through the soft passage 130 to generate a soft damping force.

As a result, in the present invention, by additionally applying the disc spring 400 having directionality to the first main disk 220, it is possible to easily secure an installation space for the valve within a limited space and realize the same performance. However, it is possible to reduce the volume of the equipment.

In addition, when the pressure in the back pressure chamber 310 is higher than a certain pressure, the discharge valve 600 is opened to release the pressure to the outside to maintain the pressure constant, thereby controlling the open pressure of the valve during medium and high speed operation to increase excessive pressure. This can prevent deterioration of equipment durability or abnormal operation.

Although specific embodiments of the damping force variable shock absorber according to the present invention have been described so far, it is apparent that various implementation modifications are possible within the limits that do not depart from the scope of the present invention.

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

That is, it should be understood that the above-described embodiment is illustrative in all respects 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; All changes or modifications derived from the concept of equivalents thereof should be construed as being included in the scope of the present invention.

10: cylinder 11: compression chamber
12: tension chamber 20: piston rod
30: piston 31: main flow path
40: solenoid valve 41: spool
100: spool guide 110: hollow
120: hard euro 130: soft euro
200: main valve 210: retainer
211: first passage 212: second passage
220: first main disk 230: second main disk
231: slit 300: back pressure chamber
310: back pressure chamber 400: disc spring
410: gap 500: outlet
510: spacing part 520: coupling hole
600: discharge valve 610: first discharge disk
620: second ejection disk

Claims (8)

A piston rod performing compression and tension stroke in the cylinder, a piston coupled to the lower end of the piston rod to divide the cylinder into a compression chamber and a tension chamber, and a piston having a main flow passage through it up and down, coupled between the piston rod and the piston In the damping force variable shock absorber having a solenoid that raises and lowers the spool by magnetic force,
a spool guide in which a hard flow path and a soft flow path are respectively formed to guide the spool in a state surrounding the outer periphery, and to be connected to the inner hollow by the movement of the spool;
a main valve installed in the stroke direction of the piston, the passage is connected to the main passage and the soft passage when the soft passage is opened to generate a damping force through the main disks;
a back pressure chamber coupled to each of the stroke directions of the main valves and configured to generate a damping force by connecting a back pressure chamber to the hard flow passage through the main flow passage and the passage when the hard flow passage is opened; and
and a dish disk installed in the back pressure chamber to elastically support the stroke direction of the main disks, and a central portion fixed to the spool guide is spaced apart from the main disk; and
The main valve is
The retainer is installed in the stroke direction of the piston, a first passage is formed in a central portion to be connected to the main passage, and a second passage is formed in an edge portion to be connected to the back pressure chamber, the compression chamber, and the tension chamber. Wow,
a first main disk installed in the stroke direction of the retainers and closely attached to the central portion of the retainers to generate a damping force in the first passage;
It is characterized in that it is provided as a second main disk which is respectively installed in the stroke direction of the first main disks and is in close contact with the edge portions of the retainers to generate a damping force in the second passage,
At the edge portion of the second main disk,
A damping force variable shock absorber in which one or more slits are formed. delete The method according to claim 1,
The plate disk is
A damping force variable shock absorber, characterized in that an edge portion elastically supports the stroke direction of the first main disks, and a center portion fixed to the spool guide is convexly spaced apart in a direction opposite to the main disk to form a curved surface . ◈Claim 4 was abandoned when paying the registration fee.◈ The method according to claim 1,
In the central portion of the plate disk,
A damping force variable shock absorber, characterized in that a coupling hole for through coupling to the outer periphery of the spool guide is formed through the spool guide. The method according to claim 1,
The slit is
Damping force variable shock absorber, characterized in that the fluid transferred from the back pressure chamber of the back pressure chamber is moved to the main flow path through the second passage. The method according to claim 1,
The hard oil is
are respectively formed at positions of the retainers and the back pressure chamber, and connect the first passage to the hollow of the spool guide and the back pressure chamber when opened,
The soft oil is
A damping force variable shock absorber, characterized in that it is formed to share the piston position and the hard flow path, and connects the first path and the main flow path when opened. ◈Claim 7 was abandoned at the time of payment of the registration fee.◈ The method according to claim 1,
In the stroke direction of the back pressure chambers,
an outlet for connecting the back pressure chamber to the compression chamber and the tension chamber;
and a discharge valve installed in a state of blocking the discharge port in the direction of the compression chamber and the tension chamber, and opened when the pressure in the back pressure chamber is greater than or equal to a set pressure. ◈Claim 8 was abandoned when paying the registration fee.◈ 8. The method of claim 7,
The discharge valve is
one or a plurality of first discharge disks installed in a state in which the discharge port is blocked in the direction of the compression chamber and the tension chamber, the rim portion being opened when the pressure in the back pressure chamber is greater than or equal to a set pressure;
and a second discharge disk supporting the first discharge disks in the directions of the back pressure chambers, respectively, and placing the first discharge disks in close contact with the back pressure chamber.

Images