KR20160131309A - Variable damper - Google Patents

Variable damper Download PDF

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Publication number
KR20160131309A
KR20160131309A KR1020150063349A KR20150063349A KR20160131309A KR 20160131309 A KR20160131309 A KR 20160131309A KR 1020150063349 A KR1020150063349 A KR 1020150063349A KR 20150063349 A KR20150063349 A KR 20150063349A KR 20160131309 A KR20160131309 A KR 20160131309A
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KR
South Korea
Prior art keywords
valve
piston head
chamber
piezo element
cylinder
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KR1020150063349A
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Korean (ko)
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KR101683502B1 (en
Inventor
김정훈
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현대자동차주식회사
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Priority to KR1020150063349A priority Critical patent/KR101683502B1/en
Publication of KR20160131309A publication Critical patent/KR20160131309A/en
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Publication of KR101683502B1 publication Critical patent/KR101683502B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3214—Constructional features of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/34—Special valve constructions; Shape or construction of throttling passages
    • F16F9/3405—Throttling passages in or on piston body, e.g. slots
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
    • F16F9/46—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall
    • F16F9/461—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall characterised by actuation means

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

A variable damper is disclosed. The disclosed variable damper comprises: i) a cylinder filled with a fluid; ii) an orifice passage which is movably disposed inside the cylinder and which divides the inside of the cylinder into an upper chamber and a lower chamber, Wherein the piston head assembly includes a valve mounting portion for movably providing a valve body for opening and closing an orifice passage and forming a valve chamber therein, and a piston mounted on one side of the valve chamber, And an incompressible fluid that fills the interior of the valve chamber and moves the valve body.

Description

Variable damper {VARIABLE DAMPER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension of a vehicle, and more particularly to a hydraulic variable damper for damping vibrations of a vehicle using resistance of a fluid.

Generally, the suspension of a vehicle plays a role of relieving the shock transmitted from the road surface to the vehicle body to secure a ride comfort. Such a suspension device is provided with a damper for controlling the free vibration of the spring when the shock is generated due to irregular road surface, rapid acceleration, deceleration, or the like.

A damper is a hydraulic damper that damps vibration as a resistance of a fluid. Such a hydraulic damper basically has a piston and a cylinder. The piston includes a piston head and a piston rod. A plurality of orifices are formed in the piston head in a circumferential direction. An annular O-ring is provided at an outer circumferential end of the piston head.

The cylinder is divided into an upper chamber and a lower chamber on the basis of a piston head inserted into the cylinder. On one side, a piston rod connected to a vibration reduction object (vehicle body) Lt; / RTI >

Therefore, when the vibration damper of the above-described type is transmitted to the piston head inside the cylinder through the piston rod, the piston head is moved in the cylinder in the vertical direction, Flows through the orifice in the direction of the upper chamber or the lower chamber.

Accordingly, a pressure difference is generated between the upper chamber and the lower chamber by the flow of the fluid in accordance with the movement of the piston head in the cylinder, and the damping force is generated by the pressure difference.

On the other hand, the damping force of a general damper is proportional to the relative speed of the piston to the cylinder. The damping force required for the vehicle varies depending on the operating conditions such as the input frequency and the input size.

For this purpose, in the prior art, for example, a variable damper for adjusting the damping force by changing the sectional area of the flow path of the orifice by using a solenoid valve has been developed and applied.

However, such a variable damper is disadvantageous in that it is complicated in structure and expensive in cost. Particularly in recent years, there is an increasing demand for the response speed of the variable damper, and in the case of the solenoid valve type widely used today, there is a limit to the improvement of the reaction speed.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

Embodiments of the present invention provide a variable damper capable of rapidly responding to a required change in damping force by changing a cross-sectional area of a flow path of a piston for flowing a fluid in a cylinder to a simple configuration.

A variable damper according to an embodiment of the present invention comprises: i) a cylinder filled with a fluid; ii) a movable chamber which is movably disposed inside the cylinder, and which divides the inside of the cylinder into an upper chamber and a lower chamber, And a piston head assembly including an orifice passage for interconnecting the chamber and the lower chamber, wherein the piston head assembly includes a valve mounting portion having a valve body movably installed therein for opening and closing the orifice passage, A piezo element fixed to one side of the valve chamber, and an incompressible fluid filled in the valve chamber and moving the valve body.

Further, in the variable damper according to the embodiment of the present invention, the piezoelectric element may contract and expand according to the direction of the voltage applied by the controller.

In addition, in the variable damper according to the embodiment of the present invention, the piezoelectric element is expanded in accordance with the direction of a voltage applied by the controller, and can provide a pressing force to the incompressible fluid.

Further, in the variable damper according to the embodiment of the present invention, the valve body is moved downward by the incompressible fluid, and the sectional area of the orifice passage can be reduced.

Further, in the variable damper according to the embodiment of the present invention, the piezoelectric element is contracted according to a direction of a voltage applied by the controller, and can provide a suction force to the incompressible fluid.

Further, in the variable damper according to the embodiment of the present invention, the valve body is moved upward by the incompressible fluid, and the sectional area of the orifice passage can be increased.

Further, in the variable damper according to the embodiment of the present invention, the controller can change the direction of the voltage applied to the piezo element according to the amount of vibration transmitted to the piston head assembly.

Further, in the variable damper according to the embodiment of the present invention, the piezo element may be bonded to one surface of the valve chamber by bonding or clamping.

Further, in the variable damper according to the embodiment of the present invention, the piezoelectric element may be formed of the piezoelectric layer formed between the upper and lower electrode layers and the upper and lower electrode layers.

Further, in the variable damper according to the embodiment of the present invention, the valve mounting portion may be integrally formed with the piston head body forming the orifice passage.

Further, in the variable damper according to the embodiment of the present invention, the orifice passage includes a valve passage penetrating to the lower surface of the piston head body corresponding to the valve body, and a valve passage connected to the valve passage, As shown in FIG.

Further, in the variable damper according to the embodiment of the present invention, the valve mounting portion may be formed with a valve hole connected to the valve chamber and movably supporting the valve body.

Further, in the variable damper according to the embodiment of the present invention, the piston head assembly may be connected to a piston rod passing through one side of the cylinder.

Further, in the variable damper according to the embodiment of the present invention, the piston rod may be connected to the valve mounting portion.

A variable damper according to an embodiment of the present invention includes: i) a cylinder filled with a fluid; ii) a movable chamber which is movably disposed inside the cylinder and which divides the inside of the cylinder into an upper chamber and a lower chamber, And a piston head assembly having an orifice passage for interconnecting the upper chamber and the lower chamber, wherein the piston head assembly includes a piston head body connected to a piston rod passing through one side of the cylinder, A first piezoelectric element provided between the piston head body and compressed by a load input to the piston head and generating a voltage corresponding to the pressure, and a valve body formed integrally with the piston head body and opening / closing the orifice passage, A valve mounting portion formed inside the valve chamber and forming a valve chamber therein; A second piezo element fixed on one surface and electrically connected to the first piezo element and contracted and expanded by receiving the voltage from the first piezo element through a controller; And may include incompressible fluids that move sieves.

Further, in the variable damper according to the embodiment of the present invention, the controller can change the direction of a voltage applied from the first piezo element to the second piezo element according to a load input to the piston rod.

Further, in the variable damper according to the embodiment of the present invention, the second piezo element may contract and expand according to the direction of the voltage applied by the controller.

Embodiments of the present invention can provide a pressing force or a suction force to the incompressible fluid by applying a positive or negative voltage to the piezo element inside the valve mounting part according to the input vibration amount to expand or contract the piezo element.

Therefore, in the embodiment of the present invention, since the valve body is moved in the vertical direction by the pressing force or the suction force of the incompressible fluid, the flow path cross-sectional area of the orifice passage can be varied and the resistance of the fluid in the cylinder can be adjusted. Can respond quickly to change.

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a schematic view of a variable damper according to an embodiment of the present invention.
2 and 3 are views for explaining the operation of the variable damper according to the embodiment of the present invention.
4 is a schematic view of a variable damper according to another embodiment of the present invention.
5 and 6 are views for explaining the operation of a variable damper according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

In the following detailed description, the names of components are categorized into the first, second, and so on in order to distinguish the components from each other in the same relationship, and are not necessarily limited to the order in the following description.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

It should be noted that terms such as " ... unit ", "unit of means "," part of item ", "absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

1 is a schematic view of a variable damper according to an embodiment of the present invention.

Referring to FIG. 1, a variable damper 100 according to an embodiment of the present invention is provided between a vehicle body and an axle of a vehicle to mitigate shock or vibration transmitted from the road surface during running of the vehicle, The present invention can be applied to a suspension device that improves ride comfort.

For example, the variable damper 100 according to the embodiment of the present invention can be applied to a shock absorber that absorbs natural vibration (free vibration) of a suspension spring in a suspension device to improve ride comfort. Here, the variable damper 100 may generate a damping force that damps natural vibration of the suspension spring as a resistance of fluid.

The variable damper 100 according to the embodiment of the present invention has a structure capable of quickly responding to a change in damping force required by changing the sectional area of a flow path of a piston for flowing fluid in a cylinder to a simple configuration.

The variable damper 100 according to an embodiment of the present invention basically includes a cylinder 10 and a piston head assembly 50. The variable damper 100 will be described below.

In this case, the cylinder 10 is formed in a cylindrical shape and forms an internal space in which both ends are closed, and a working fluid such as oil (hereinafter referred to as "fluid"

The piston head assembly 50 is movably installed inside the cylinder 10 and the inside of the cylinder 10 is partitioned into an upper chamber 11 and a lower chamber 12, can do.

The piston head assembly 50 is provided with an o-ring (not shown in the figure) on the outer circumferential side and a plurality (not shown) of interconnecting the upper chamber 11 and the lower chamber 12 in the cylinder 10 There are formed two orifice passages 15.

The piston head assembly 50 according to the embodiment of the present invention as described above has a structure capable of varying the sectional area of the orifice passage 15 according to the required damping force.

The piston head assembly 50 for this purpose includes a piston head main body 51 and a valve mounting portion 53 formed integrally with the piston head main body 51.

The piston head body 51 is in close contact with the inner circumferential surface of the cylinder 10 through an O-ring. The piston head body 51 forms the orifice passage 15 mentioned above and is movably provided inside the cylinder 10.

In the embodiment of the present invention, the valve mounting portion 53 includes a valve body 55 for opening and closing the orifice passage 15 of the piston head body 51. The valve body 55 is vertically movably provided on the valve mounting portion 53 and can be adjusted by the flow path cross-sectional area of the orifice passage 15. A valve chamber 57 in a predetermined space is formed in the valve mounting portion 53.

A valve hole 59 connected to the valve chamber 57 is formed in the valve mounting portion 53. The valve hole 59 supports the valve body 55 so as to reciprocate in the vertical direction.

The orifice passage 15 includes a valve passage 17a extending through the lower surface of the piston head main body 51 in correspondence with the valve element 55 of the valve mounting portion 53 and connected to the valve passage 17a And a connection passage 17b penetrating the upper surface of the piston head main body 51. At this time, the valve body 55 is reciprocated in the vertical direction while being supported by the valve hole 59 of the valve mounting portion 53, and can selectively control the flow path cross-sectional area of the valve passage 17a.

Meanwhile, in the embodiment of the present invention, the valve mounting portion 53 includes a piezo element 61 fixed to one surface of the valve chamber 57.

The piezoelectric element 61 is a piezoelectric element made of piezoelectric crystal, and has a property that when a predetermined voltage is applied to the piezoelectric crystal, the piezoelectric crystal swells or contracts instantaneously. That is, the piezo element 61 may be provided as a stroke actuator using a piezoelectric inverse piezoelectric effect in which expansion and contraction is generated when a voltage is applied.

For example, the piezoelectric element 61 is made of piezoelectric ceramics or lead zirconate titanate (PZT) in which barium titanate is sintered. Since such a piezoelectric element 61 is a well-known technique well known in the art, A detailed description of the constitution and the material will be omitted.

Here, the piezo element 61 may be bonded to one surface of the valve chamber 57 by bonding or fastening. This piezoelectric element 61 is composed of a piezoelectric layer 65 formed between the upper and lower electrode layers 63 and the upper and lower electrode layers 63.

When the voltage is applied to the piezoelectric element 61, the piezoelectric element 61 contracts and expands according to the direction of the voltage applied by the controller 90 because expansion and contraction occurs.

That is, the piezoelectric element 61 can expand the piezoelectric layer 65 when a voltage is applied to the upper and lower electrode layers 63 in the forward direction. The piezoelectric element 61 can contract the piezoelectric layer 65 when a voltage is applied to the upper and lower electrode layers 63 in a reverse direction.

On the other hand, in the embodiment of the present invention, the valve mounting portion 53 is filled on the one side of the valve chamber 57 in which the piezo element 61 is fixed, and the incompressible fluid 58). The incompressible fluid 58 may be a fluid whose density remains constant during flow, for example, oil as a liquid.

The piezo element 61 is driven by the voltage applied to the upper and lower electrode layers 63 by the controller 90 in accordance with the embodiment of the present invention as the incompressible fluid 58 is filled in the valve chamber 57, The piezoelectric layer 65 is inflated along the direction of the valve chamber 57 and can provide a pressing force to the incompressible fluid 58 inside the valve chamber 57. [ Accordingly, the valve body 55 is moved downward by the incompressible fluid 58, and the flow path cross-sectional area of the valve passage 17a of the orifice passage 15 can be reduced.

The piezoelectric element 61 is configured such that the piezo layer 65 is contracted in accordance with the direction of the voltage applied to the upper and lower electrode layers 63 by the controller 90 and the incompressible fluid 58 ). ≪ / RTI > The valve body 55 is moved upward by the incompressible fluid 58 and the cross-sectional area of the flow path of the valve passage 17a of the orifice passage 15 can be increased.

On the other hand, the piston head assembly 50 constructed as described above is connected to a piston rod 71 passing through one side (upper end) of the cylinder 10, And may be connected to the valve mounting portion 53 of the piston head assembly 50. [

Reference numeral 19, which is not illustrated in the drawing, represents a gas chamber of a known technology, which is partitioned through the diaphragm 18 in the lower chamber 12 and injected with a high-pressure nitrogen gas. This gas chamber 19 is intended to compensate for the volume increase and decrease in the cylinder 10 as the piston head assembly 50 moves.

The controller 90 can change the direction of the voltage applied to the electrode layer 63 of the piezoelectric element 61 according to the amount of vibration transmitted to the piston head assembly 50 through the piston rod 71. [

In this case, when it is determined that the amount of vibration acting on the piston rod 71 is larger than the predetermined reference value, the controller 90 applies a positive voltage to the electrode layer 63 of the piezo element 61 And the piezoelectric layer 65 can be expanded.

When it is determined that the amount of vibration acting on the piston rod 71 is smaller than the reference value, the controller 90 applies a reverse voltage to the electrode layer 63 of the piezo element 61, The layer 65 can be shrunk.

Hereinafter, the operation of the variable damper 100 according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, in the embodiment of the present invention, when vibration or impact force is inputted from the vehicle body or the like through the piston rod 71, the piston head assembly 50 inside the cylinder 10 is moved in the vertical direction, The fluid in the interior flows into the upper chamber 11 or the lower chamber 12 through the orifice passage 15 of the piston head assembly 50.

Therefore, in the embodiment of the present invention, a pressure difference is generated between the upper chamber 11 and the lower chamber 12 by the flow of the fluid due to the movement of the piston head assembly 50 inside the cylinder 10, It is possible to generate a damping force that damps vibrations or shocks due to the pressure difference.

In this process, in the embodiment of the present invention, the controller 90 compares the amount of vibration acting on the piston rod 71 with a predetermined reference value, and when it is determined that the amount of vibration is larger than the reference value, A positive voltage is applied to the electrode layer 63 of the piezoelectric element 61 fixed on one surface of the piezoelectric element 57.

Then, in the embodiment of the present invention, the piezo layer 65 of the piezo element 61 is expanded as in FIG. 2 to provide a pressing force to the incompressible fluid 58 inside the valve chamber 57. The valve body 55 of the valve mounting portion 53 moves downward by the incompressible fluid 58 and reduces the flow path cross sectional area of the valve passage 17a of the orifice passage 15. [

Thus, in the embodiment of the present invention, by increasing the resistance of the fluid in the cylinder 10 flowing through the orifice passage 15, a large damping force can be generated and vibration or impact force can be attenuated.

In contrast, in the embodiment of the present invention, the controller 90 compares the amount of vibration acting on the piston rod 71 with a predetermined reference value, and if it is determined that the amount of vibration is smaller than the reference value, 63 in the opposite direction.

3, the piezo layer 65 of the piezo element 61 is contracted to provide a suction force to the incompressible fluid 58 inside the valve chamber 57. In this embodiment, The valve body 55 of the valve mounting portion 53 is moved upward by the incompressible fluid 58 to increase the flow path cross-sectional area of the valve passage 17a of the orifice passage 15. [

Accordingly, in the embodiment of the present invention, by reducing the resistance of the fluid in the cylinder 10 flowing through the orifice passage 15, a relatively small damping force can be generated and the vibration or the impact force can be attenuated.

According to the variable damper 100 according to the embodiment of the present invention as described above, the forward and reverse voltages are applied to the piezo element 61 inside the valve mounting portion 53 according to the amount of vibration to be inputted, The compressive or suction force can be imparted to the incompressible fluid 58 by expanding or contracting the fluid 61.

Thus, in the embodiment of the present invention, the flow path cross-sectional area of the orifice passage 15 is varied by moving the valve element 55 in the up-and-down direction by the pressing force or the suction force of the incompressible fluid 58, Since the resistance can be adjusted, it can respond quickly to various changes in damping force required.

4 is a schematic view of a variable damper according to another embodiment of the present invention.

4, a variable damper 200 according to another embodiment of the present invention includes a first piezo element 121 provided between a piston rod 171 and a piston head body 151, And includes the same valve mounting portion 153.

The first piezoelectric element 121 is provided as a piezoelectric electric effect element having a property of generating a voltage when a pressure is applied and expanding or contracting when a voltage is applied thereto.

In the embodiment of the present invention, the first piezo element 121 is compressed by a load input to the piston head body 151 through the piston rod 171, and can generate a voltage corresponding thereto.

The first piezoelectric element 121 may be integrally fixed to the piston rod 171 and the piston head body 151 between the piston rod 171 and the piston head body 151, (Not shown in the figure) while being fixed to the piston rod 171. The first piezoelectric element 121 may be formed by forming a piezoelectric layer between the upper and lower electrode layers.

In the embodiment of the present invention, the valve mounting portion 153 includes a valve body 155 for opening and closing the orifice passage 115 of the piston head body 151. The valve body 155 is installed on the valve mounting portion 153 so as to reciprocate in the vertical direction and can be adjusted by the flow path cross-sectional area of the orifice passage 115. A valve chamber 157 in a predetermined space is formed in the valve mounting portion 153.

The valve mounting portion 153 is formed with a valve hole 159 connected to the valve chamber 157. The valve hole 159 supports the valve body 155 so as to reciprocate in a vertical direction.

The orifice passage 115 includes a valve passage 117a extending through the lower surface of the piston head body 151 in correspondence with the valve body 155 of the valve mounting portion 153, And a connecting passage 117b penetrating to the upper surface of the piston head body 151. [ At this time, the valve body 155 is reciprocated in the vertical direction while being supported by the valve hole 159 of the valve mounting portion 153, and can selectively control the flow path cross-sectional area of the valve passage 117a.

Meanwhile, in the embodiment of the present invention, the valve mounting portion 153 includes a second piezo element 161 as in the electric embodiment, which is formed to be fixed to one side of the valve chamber 157.

The second piezoelectric element 161 is a piezoelectric element made of piezoelectric crystal. When a predetermined voltage is applied to the piezoelectric crystal, the piezoelectric crystal swells or contracts instantaneously. That is, the second piezo element 161 may be provided as a stroke actuator using a piezoelectric inverse piezoelectric effect in which expansion and contraction is generated when a voltage is applied.

The second piezo element 161 receives the voltage generated in the first piezo element 121 by the load inputted to the piston rod 171 through the controller 190 and generates a shrinkage and expansion .

Here, the second piezo element 161 may be bonded to one surface of the valve chamber 157 by bonding or fastening. For example, the second piezoelectric element 161 is composed of a piezoelectric layer 165 formed between the upper and lower electrode layers 163 and the upper and lower electrode layers 163.

That is, when the forward voltage is applied to the upper and lower electrode layer 163 by the controller 190, the second piezo element 161 can expand the piezo layer 163. The second piezo element 161 can shrink the piezoelectric layer 165 when a voltage in the opposite direction is applied to the upper and lower electrode layers 163 by the controller 190.

The second piezoelectric element 161 is electrically connected to the upper and lower electrode layers of the first piezoelectric element 121. The controller 190 is connected to the piston head body 151 through the piston rod 171 The voltage generated in the first piezoelectric element 121 is received by the vibration or the impact and the direction of the voltage applied from the first piezoelectric element 121 to the electrode layer 163 of the second piezoelectric element 161 is changed .

In this case, if the controller 190 determines that the vibration or the impact acting on the piston rod 171 is larger than the predetermined reference value, the controller 190 sets the voltage supplied from the first piezo element 121 to the second piezo The piezoelectric layer 165 can be inflated by applying it to the electrode layer 163 of the element 161 in the forward direction.

When the controller 190 determines that the vibration or the impact acting on the piston rod 171 is smaller than the predetermined reference value, the controller 190 controls the voltage supplied from the first piezo element 121 to the second piezo element < RTI ID = To the electrode layer 163 of the piezoelectric layer 161 in the opposite direction to shrink the piezoelectric layer 165.

On the other hand, in the embodiment of the present invention, the valve mounting portion 153 is filled in the valve chamber 157 to which the second piezo element 161 is fixed on one surface, And a fluid (158). The incompressible fluid 158 may be a fluid whose density remains constant during flow, for example, oil as a liquid.

The second piezoelectric element 161 is applied to the upper and lower electrode layers 163 by the controller 190 in the embodiment of the present invention by filling the incompressible fluid 158 in the valve chamber 157 as described above. The piezoelectric layer 165 is expanded in accordance with the direction of the applied voltage and can provide a pressing force to the incompressible fluid 158 inside the valve chamber 157. [ Accordingly, the valve body 155 is moved downward by the incompressible fluid 158, and the flow path cross-sectional area of the valve passage 117a of the orifice passage 115 can be reduced.

The piezoelectric element 161 is configured such that the piezo layer 165 is contracted in accordance with the direction of the voltage applied to the upper and lower electrode layers 163 by the controller 190 and the incompressible fluid 158 ). ≪ / RTI > Accordingly, the valve body 155 is moved upward by the incompressible fluid 158, and the flow path cross-sectional area of the valve passage 117a of the orifice passage 115 can be increased.

Hereinafter, the operation of the variable damper 200 according to another embodiment of the present invention will be described with reference to the accompanying drawings.

First, in the embodiment of the present invention, the first piezo element 121 is compressed by the load input to the piston head body 151 through the piston rod 171, and generates a voltage corresponding thereto.

At the same time, the controller 190 compares the amount of vibration or the amount of impact acting on the piston rod 171 with a predetermined reference value. If the amount of vibration or the amount of impact is larger than the reference value (when a sudden impact load is input) The voltage supplied from the element 121 is applied to the electrode layer 163 of the second piezo element 161 in the forward direction.

5, the piezo layer 165 of the second piezo element 161 is inflated to provide a biasing force to the incompressible fluid 158 within the valve chamber 157. In this embodiment, The valve body 155 of the valve mounting portion 153 moves downward by the incompressible fluid 158 and reduces the flow path cross sectional area of the valve passage 117a of the orifice passage 115. [

Accordingly, in the embodiment of the present invention, by increasing the resistance of the fluid in the cylinder 110 flowing through the orifice passage 115, a large damping force can be generated and vibration or impact force can be damped.

In contrast, in the embodiment of the present invention, the controller 190 compares the amount of vibration or the amount of impact acting on the piston rod 171 with a predetermined reference value, and if it is determined that the vibration amount or the amount of impact is smaller than the reference value, 121 to the electrode layer 163 of the second piezo element 161 in the opposite direction.

6, the piezo layer 165 of the second piezo element 161 is contracted to provide a suction force to the incompressible fluid 158 within the valve chamber 157. In this embodiment, The valve body 155 of the valve mounting portion 153 is moved upward by the incompressible fluid 158 to increase the flow path cross sectional area of the valve passage 117a of the orifice passage 115. [

Therefore, in the embodiment of the present invention, by reducing the resistance of the fluid in the cylinder 110 flowing through the orifice passage 115, a relatively small damping force can be generated and the vibration or the impact force can be attenuated.

Accordingly, in the embodiment of the present invention, the flow path cross-sectional area of the orifice passage 115 is varied by moving the valve body 155 in the vertical direction by the pressing force or the suction force of the incompressible fluid 158, Since the resistance can be adjusted, it can respond quickly to various changes in damping force required.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Other embodiments may easily be suggested by adding, changing, deleting, adding, or the like of elements, but this also falls within the scope of the present invention.

10, 110 ... cylinder 11 ... upper chamber
12 ... lower chamber 15, 115 ... orifice channel
17a, 117a ... valve passage 17b, 117b ... connection passage
18 ... diaphragm 19 ... gas chamber
50 ... piston head assembly 51, 151 ... piston head body
53, 153 ... valve mounting portions 55, 155 ... valve body
57, 157 ... valve chamber 58, 158 ... incompressible fluid
59, 159 ... valve hole 61 ... piezo element
63, 163 ... Electrode layer 65, 165 ... piezo layer
71, 171 ... Piston rod 90, 190 ... Controller
121 ... first piezo element 161 ... second piezo element

Claims (14)

A cylinder filled with fluid; And
A piston head assembly movably disposed in the cylinder and partitioning the interior of the cylinder into an upper chamber and a lower chamber and forming an orifice passage for interconnecting the upper chamber and the lower chamber;
/ RTI >
Wherein the piston head assembly includes a valve mounting portion in which a valve body for opening and closing the orifice passage is movably provided and a valve chamber is formed therein, a piezo element fixed to one surface of the valve chamber, And an incompressible fluid filled in the valve body and moving the valve body. The method according to claim 1,
Wherein the piezo element contracts and expands according to a direction of a voltage applied by the controller. 3. The method of claim 2,
The piezoelectric element being inflated according to the direction of the voltage applied by the controller to provide a pressing force to the incompressible fluid,
Wherein the valve body is moved downward by the incompressible fluid to reduce the cross-sectional area of the orifice passage. The method of claim 3,
Wherein the piezo element is contracted according to the direction of the voltage applied by the controller and provides a suction force to the incompressible fluid,
Wherein the valve body is moved upward by the incompressible fluid to increase the cross-sectional area of the orifice passage. 3. The method of claim 2,
The controller comprising:
Wherein a direction of a voltage applied to the piezo element is changed according to an amount of vibration transmitted to the piston head assembly. The method according to claim 1,
Wherein the piezo element is bonded to one surface of the valve chamber in a bonding or clamping manner. The method according to claim 1,
The piezoelectric element includes:
And a piezoelectric layer formed between the upper and lower electrode layers and the upper and lower electrode layers. The method according to claim 1,
Wherein the valve mounting portion is integrally formed with a piston head body forming the orifice passage. 9. The method of claim 8,
The orifice passage
A valve passage passing through the lower surface of the piston head body corresponding to the valve body; and a connection passage connected to the valve passage and penetrating the upper surface of the piston head body. The method according to claim 1,
Wherein the valve mounting portion is formed with a valve hole connected to the valve chamber and movably supporting the valve body. The method according to claim 1,
The piston head assembly being connected to a piston rod passing through one side of the cylinder,
And the piston rod is connected to the valve mounting portion. A cylinder filled with fluid; And
And a piston head assembly movably disposed in the cylinder and partitioning the inside of the cylinder into an upper chamber and a lower chamber and forming an orifice passage for interconnecting the upper chamber and the lower chamber,
The piston head assembly includes a piston head body connected to a piston rod penetrating to one side of the cylinder, a piston head body provided between the piston rod and the piston head body, compressed by a load applied to the piston head, A valve mounting part formed integrally with the piston head body and having a valve body movably installed therein for opening and closing the orifice passage and having a valve chamber therein; A second piezo element that is electrically connected to the first piezo element and is contracted and expanded by receiving the voltage from the first piezo element through a controller, and a second piezoelectric element which is filled in the valve chamber and which moves the valve body Wherein the variable damper comprises a fluid. 13. The method of claim 12,
The controller comprising:
And a direction of a voltage applied from the first piezo element to the second piezo element is changed according to a load inputted to the piston rod. 14. The method of claim 13,
Wherein the second piezo element comprises:
And wherein the variable damper is contracted and inflated according to a direction of a voltage applied by the controller.
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WO2020059901A1 (en) * 2018-09-19 2020-03-26 주식회사 디엔티 Pressure delivery cylinder comprising bumper section

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Publication number Priority date Publication date Assignee Title
KR101993645B1 (en) 2017-10-31 2019-06-26 충북대학교 산학협력단 Linear type one-way damper

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JPH04175533A (en) * 1990-11-05 1992-06-23 Nissan Motor Co Ltd Displacement magnifying mechanism for piezoelectric actuator
JPH07112768B2 (en) * 1988-09-22 1995-12-06 日本電装株式会社 Vehicle damping force detector
JP2012013226A (en) * 2010-05-31 2012-01-19 Honda Motor Co Ltd Damping force variable damper
JP2012092883A (en) * 2010-10-26 2012-05-17 Honda Motor Co Ltd Damping force variable damper

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JPH07112768B2 (en) * 1988-09-22 1995-12-06 日本電装株式会社 Vehicle damping force detector
JPH04175533A (en) * 1990-11-05 1992-06-23 Nissan Motor Co Ltd Displacement magnifying mechanism for piezoelectric actuator
JP2012013226A (en) * 2010-05-31 2012-01-19 Honda Motor Co Ltd Damping force variable damper
JP2012092883A (en) * 2010-10-26 2012-05-17 Honda Motor Co Ltd Damping force variable damper

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Publication number Priority date Publication date Assignee Title
WO2020059901A1 (en) * 2018-09-19 2020-03-26 주식회사 디엔티 Pressure delivery cylinder comprising bumper section

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