KR20160131310A - Variable damper - Google Patents

Variable damper Download PDF

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Publication number
KR20160131310A
KR20160131310A KR1020150063350A KR20150063350A KR20160131310A KR 20160131310 A KR20160131310 A KR 20160131310A KR 1020150063350 A KR1020150063350 A KR 1020150063350A KR 20150063350 A KR20150063350 A KR 20150063350A KR 20160131310 A KR20160131310 A KR 20160131310A
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KR
South Korea
Prior art keywords
piezo element
cylinder
piston rod
controller
piston head
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KR1020150063350A
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Korean (ko)
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KR101683503B1 (en
Inventor
김정훈
강태경
김종민
Original Assignee
현대자동차주식회사
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Priority to KR1020150063350A priority Critical patent/KR101683503B1/en
Publication of KR20160131310A publication Critical patent/KR20160131310A/en
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Publication of KR101683503B1 publication Critical patent/KR101683503B1/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)
  • Vehicle Body Suspensions (AREA)

Abstract

Disclosed is a variable damper. According to the present invention, the variable damper comprises: i) a cylinder filled with a working fluid; ii) a piston rod disposed to penetrate the cylinder from the outside to the inside; iii) a piston head connected to an end of the piston rod inside the cylinder, installed to be movable in a vertical direction, dividing the inside of the cylinder into an upper chamber and a lower chamber, and forming a plurality of orifice passages interconnecting the upper chamber and the lower chamber; iv) a first piezo element provided between the piston rod and the piston head and compressed by a load input to the piston head to generate voltage corresponding thereof; v) a second piezo element provided in a bottom face of the piston head, electrically connected to the first piezo element and shrinking and expanding by receiving voltage from the first piezo element through a controller; and vi) a valve assembly fixed in the second piezo element, moving in the vertical direction by the second piezo element and adjusting a cross-sectional area of the passage for the orifice passage.

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 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 with respect to the cylinder. Since the damping force required by the vehicle varies depending on the operating conditions such as the input frequency and the input size, a variable damper capable of varying the size of the orifice Developed and applied.

However, such a variable damper is disadvantageous in that it is complicated in structure and expensive in cost. In recent years, adaptive dampers having a mechanism in which the damping force is varied according to the movement of the piston rod have been applied.

One of the adaptive dampers is an amplitude sensitive damper (ASD). Amplitude responsive damper is a damper whose damping force is variable according to the movement of the piston rod. When the input displacement through the piston rod is large, damping force is increased Lt; / RTI >

However, when the sudden impact load is applied to the piston rod, such a damper must change the mechanism to generate a large damping force. However, there is a problem that the damping force becomes large only when the input displacement of the piston rod increases.

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 increasing a damping force at the time of an impact load due to abrupt compression 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 includes: i) a cylinder filled with a working fluid; ii) a piston rod disposed to penetrate from the outside to the inside of the cylinder; and iii) an end of the piston rod A piston head connected to the upper chamber and the lower chamber, the piston head being divided into an upper chamber and a lower chamber, the piston having a plurality of orifice passages connecting the upper chamber and the lower chamber; ) A first piezo element provided between the piston rod and the piston head, the first piezo element being compressed by a load applied to the piston head and generating a voltage corresponding thereto, and v) The piezoelectric element is electrically connected to the piezoelectric element, and receives the voltage from the first piezoelectric element through the controller to shrink and expand And a second piezo element, ⅵ) the first is fixed to the second piezoelectric element, is moved by the second piezo element in the vertical direction can include a valve assembly for controlling the passage area of the orifice passage.

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 contracts in accordance with the direction of the voltage applied by the controller, moves the valve assembly in the upward direction, Can be reduced.

Further, in the variable damper according to the embodiment of the present invention, the second piezo element is expanded in accordance with the direction of the voltage applied by the controller, moves the valve assembly in the downward direction, Can be increased.

Further, in the variable damper according to the embodiment of the present invention, the valve assembly includes a base plate fixed to the second piezo element, and a valve body installed on the base plate and varying a flow path cross-sectional area of the orifice passage can do.

Further, in the variable damper according to the embodiment of the present invention, the piston head, the second piezo element, and the base plate may be bonded by bonding or fastening.

The variable damper according to the embodiment of the present invention includes: i) a cylinder filled with a working fluid; ii) a piston rod arranged to penetrate from the outside to the inside of the cylinder; and iii) A piston head which is connected to an end of the cylinder and is movable in the vertical direction and which divides the inside of the cylinder into an upper chamber and a lower chamber and forms a plurality of orifice passages interconnecting the upper chamber and the lower chamber; A first piezoelectric element provided between the piston rod and the piston head, the first piezo element being compressed by a load input to the piston head and generating a voltage corresponding thereto, and v) a second piezoelectric element provided in the orifice passage, The piezoelectric element is electrically connected to the piezoelectric element, and receives the voltage from the first piezoelectric element through the controller to contract and expand The can 2 comprises a piezo element.

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 expands according to the direction of the voltage applied by the controller, and the flow path cross-sectional area of the orifice passage can be reduced.

Further, in the variable damper according to the embodiment of the present invention, the second piezo element is contracted according to the direction of the voltage applied by the controller, and the flow path cross-sectional area of the orifice passage can be increased.

The variable damper according to the embodiment of the present invention includes: i) a cylinder filled with a working fluid; ii) a piston rod arranged to penetrate from the outside to the inside of the cylinder; and iii) A piston head which is connected to an end of the cylinder and is movable in the vertical direction and which divides the inside of the cylinder into an upper chamber and a lower chamber and forms a plurality of orifice passages interconnecting the upper chamber and the lower chamber; And iv) a piezo element which is provided on a lower surface of the piston head and which is contracted and expanded by receiving a predetermined voltage, v) a piezoelectric element fixed to the piezo element, and vertically moved by the piezo element, And may include a valve assembly that adjusts the cross-sectional area.

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.

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 through the piston rod.

Embodiments of the present invention can vary the cross-sectional area of the flow path of the orifice passage according to the required damping force, rapidly increase the damping force upon input of a sudden impact load through the piston rod, and respond sensitively to various changes in damping force required .

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.
7 is a schematic view 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 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 in which the damping force can be rapidly increased when an impact load due to abrupt compression is input by changing the sectional area of the flow path of the piston that flows the fluid in the cylinder, .

The variable damper 100 according to an embodiment of the present invention basically includes a cylinder 10, a piston rod 20, a piston head 30, a first piezo element 50, a second piezo element 60 And a valve assembly 70. The valve assembly 70 will be described in detail below.

In this case, the cylinder 10 is provided in a cylindrical shape having both ends closed and an inner space filled with a working fluid such as oil (hereinafter referred to as "fluid " for convenience) Can be fixed.

The piston rod 20 is connected to a vibration reduction object such as a vehicle body and receives vibration or impact force from the vehicle body. The piston rod 20 is connected to one side of the cylinder 10 And is disposed inside the cylinder 10.

The piston head 30 is connected to the end of the piston rod 20 in the cylinder 10 and is disposed closely to the inner circumferential surface of the cylinder 10 and is vertically reciprocatable. An o-ring (not shown in the figure) is provided on the outer peripheral side of the piston head 30 and the inside of the cylinder 10 can be divided into an upper chamber 31 and a lower chamber 32 .

The piston head 30 is formed with a plurality of orifice passages 35 for interconnecting the upper chamber 31 and the lower chamber 32 in the cylinder 10.

Reference numeral 41, which is not shown in the figure, represents a gas chamber of a known technology, which is partitioned through the diaphragm 43 in the lower chamber 32 and injected with high-pressure nitrogen gas. This gas chamber 41 is intended to compensate for the volume increase and decrease in the cylinder 10 as the piston head 30 moves.

The piston head 30 according to the embodiment of the present invention as described above can vary the cross-sectional area of the orifice passage 35 according to the required damping force and can reduce the damping force when a sudden impact load is applied through the piston rod 20 And can be rapidly increased.

The piston head 30 is provided with the first piezo element 50, the second piezo element 60 and the valve assembly 70 described above. In the embodiment of the present invention, The element 50 is provided between the piston rod 20 and the piston head 30.

The first piezoelectric element 50 is provided as a piezoelectric electric effect element which generates a voltage when a pressure is applied and is expanded or contracted when a voltage is applied.

For example, the first piezoelectric element 50 may be made of piezoelectric ceramic or lead zirconate titanate (PZT) sintered with barium titanate. Since the first piezoelectric element 50 is well known in the art, a detailed description of the structure and materials of the first piezoelectric element 50 will be omitted herein.

In the embodiment of the present invention, the first piezo element 50 is compressed by a load input to the piston head 30 through the piston rod 20 and can generate a voltage corresponding thereto.

The first piezo element 50 may be integrally fixed to the piston rod 20 and the piston head 30 between the piston rod 20 and the piston head 30 and may be integrally fixed to the piston head 20 It may be fixed to the piston rod 20 through a separate medium (not shown in the figure) in a fixed state.

Here, the first piezoelectric element 50 may be formed by forming a piezoelectric layer between the upper and lower electrode layers.

In the embodiment of the present invention, the second piezo-electric element 60 receives a voltage generated in the first piezo-electric element 50 by a load inputted to the piston rod 20 through the controller 90 to shrink and expand And is provided with a piezoelectric element made of piezoelectric crystal.

The second piezoelectric element 60 has a property that the piezoelectric crystal swells or contracts instantaneously when a predetermined voltage is applied to the piezoelectric crystal.

That is, the second piezo-electric element 60 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 second piezoelectric element 60 may be made of piezoelectric ceramics or lead zirconate titanate (PZT) sintered with crystal or barium titanate as a known technique well known in the art.

The second piezo element 60 is provided on the lower surface of the piston head 30 and can be electrically connected to the upper and lower electrode layers of the first piezo element 50. The second piezo element 60 may be bonded to the lower surface of the piston head 30 in a bonding or clamping manner. Furthermore, the second piezoelectric element 60 may include a piezoelectric layer 63 formed between the upper and lower electrode layers 61 and the upper and lower electrode layers 61.

When the voltage is applied to the second piezoelectric element 60, expansion and contraction occurs, and the second piezoelectric element 60 can contract and expand according to the direction of the voltage applied by the controller 90.

That is, when the forward voltage is applied to the upper and lower electrode layers 61 by the controller 90, the second piezo element 60 can shrink the piezoelectric layer 63. The second piezo element 60 can expand the piezo layer 63 when a voltage in the reverse direction is applied to the upper and lower electrode layers 61 by the controller 90. [

The controller 90 receives a voltage generated from the first piezoelectric element 50 by the vibration or the amount of impact transmitted to the piston head 30 through the piston rod 20 and receives the voltage generated from the first piezoelectric element 50 The direction of the voltage applied to the electrode layer 61 of the second piezo element 60 can be changed.

Here, if the controller 90 determines that the vibration or the impact acting on the piston rod 20 is larger than the predetermined reference value, the controller 90 controls the voltage supplied from the first piezo element 50 to the second piezo element 50, To the electrode layer 61 of the piezoelectric layer 60 in the forward direction to shrink the piezoelectric layer 63.

If it is determined that the vibration or the impact applied to the piston rod 20 is smaller than the predetermined reference value, the controller 90 outputs the voltage supplied from the first piezo element 50 to the second piezo element 20, To the electrode layer 61 of the piezoelectric layer 60 in the opposite direction to swell the piezoelectric layer 63.

In the embodiment of the present invention, the valve assembly 70 includes a controller 90 for applying a voltage generated by the second piezo element 60 to the first piezo element 50 by a load input to the piston rod 20 Sectional area of the orifice passage 35 of the piston head 30, which is moved in the up-and-down direction by the second piezoelectric element 60 as it is shrunk and inflated as it is applied through the second piston element 30.

The valve assembly 70 includes a base plate 71 fixed to the lower surface of the second piezo element 60 and a valve plate 70 installed on the upper surface of the base plate 71 in correspondence with the orifice passage 35 of the piston head 30 And a valve body (73).

The base plate 71 may be bonded to the lower surface of the second piezo-electric element 60 in a bonding or fastening manner. That is, the base plate 71 can be moved up and down by the second piezo element 60 as the second piezo element 60 contracts and expands upon receiving a voltage through the controller 90.

The valve body 73 is fixed to the upper surface of the base plate 71 in correspondence with the orifice passage 35 of the piston head 30. The valve body 73 can be varied in the sectional area of the flow path of the orifice passage 35 of the piston head 30 as the base plate 71 is moved in the vertical direction by the second piezo element 60. [

Thus, in the embodiment of the present invention, the second piezo element 60 contracts in the direction of the voltage applied by the controller 90 and moves the base plate 71 of the valve assembly 70 upward The flow path cross-sectional area of the orifice passage 35 can be reduced through the valve body 73.

In the embodiment of the present invention, the second piezo element 60 is inflated according to the direction of the voltage applied by the controller 90, and moves the base plate 71 of the valve assembly 70 downward The flow path cross-sectional area of the orifice passage 35 can be increased through the valve body 73.

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 20, the piston head 30 inside the cylinder 10 is moved in the vertical direction, Flows into the upper chamber 31 or the lower chamber 32 through the orifice passage 35 of the piston head 30. [

Therefore, in the embodiment of the present invention, a pressure difference is generated between the upper chamber 31 and the lower chamber 32 by the flow of the fluid due to the movement of the piston head 30 in the cylinder 10, It is possible to generate a damping force that damps vibration or impact by the vehicle.

In this process, as shown in FIG. 2, in the embodiment of the present invention, the first piezo element 50 is compressed by the load input to the piston head 30 through the piston rod 20 and generates a corresponding voltage .

At the same time, the controller 90 compares the amount of vibration or the amount of impact acting on the piston rod 20 with a predetermined reference value, and if it is determined that 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 50 is applied to the electrode layer 61 of the second piezo element 60 in the forward direction.

The piezo layer 63 of the second piezo element 60 is contracted by a voltage applied from the controller 90 so that the base plate 71 of the valve assembly 70 moves upward And reduces the flow path cross-sectional area of the orifice passage (35) through the valve body (73).

Therefore, in the embodiment of the present invention, by increasing the flow resistance of the fluid in the cylinder 10 flowing through the orifice passage 35, the damping force at the time of the impact load due to abrupt compression can be rapidly increased.

In contrast, in the embodiment of the present invention, the controller 90 compares the amount of vibration or the amount of impact acting on the piston rod 20 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, 50 to the electrode layer 61 of the second piezoelectric element 60 in the reverse direction.

3, the piezo layer 63 of the second piezo-electric element 60 is expanded in response to a voltage in the reverse direction from the controller 90, 70 is moved downward to increase the cross-sectional area of the flow path of the orifice passage 35 through the valve body 73.

Therefore, in the embodiment of the present invention, by reducing the flow resistance of the fluid in the cylinder 10 flowing through the orifice passage 35, a relatively small damping force can be generated and the vibration or the impact force can be damped.

According to the variable damper 100 according to the embodiment of the present invention as described above, the cross-sectional area of the flow path of the orifice passage 35 can be varied according to the required damping force and the sudden impact load input through the piston rod 20 It increases the damping force rapidly and can respond sensitively to changes in various required damping forces.

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

4, the variable damper 200 according to another embodiment of the present invention is based on the structure of the piston rod 20, the piston head 30 and the first piezo element 50 of the electric embodiment, The valve assembly of the embodiment can be eliminated and the second piezo element 160 provided in the orifice passage 35 of the piston head 30 can be constructed.

The second piezo element 160 is formed on a part of the inner wall surface of the orifice passage 35 and is electrically connected to the first piezo element 50 and is connected to the controller 90. In the embodiment of the present invention, The first piezoelectric element 50 can be contracted and expanded by receiving the generated voltage.

The second piezoelectric element 160 may include a piezoelectric layer 163 formed between the upper and lower electrode layers 161 and the upper and lower electrode layers 161.

Here, the second piezo-electric element 160 can expand the piezoelectric layer 163 when a positive voltage is applied to the upper and lower electrode layers 161 by the controller 90. The second piezo-electric element 160 can shrink the piezoelectric layer 163 when a reverse voltage is applied to the upper and lower electrode layers 161 by the controller 90.

The controller 90 receives a voltage generated from the first piezoelectric element 50 by the vibration or the amount of impact transmitted to the piston head 30 through the piston rod 20 and receives the voltage generated from the first piezoelectric element 50 The direction of the voltage applied to the electrode layer 161 of the second piezo element 160 can be changed.

In this case, if the controller 90 determines that the vibration or impact acting on the piston rod 20 is greater than the predetermined reference value, the controller 90 may supply the voltage supplied from the first piezo element 50 to the second piezo The piezoelectric layer 163 can be inflated by being applied to the electrode layer 161 of the device 160 in the forward direction.

If it is determined that the vibration or the impact applied to the piston rod 20 is smaller than the predetermined reference value, the controller 90 outputs the voltage supplied from the first piezo element 50 to the second piezo element 20, The piezoelectric layer 163 can be contracted by being applied to the electrode layer 161 of the piezoelectric layer 160 in the reverse direction.

Further, in the embodiment of the present invention, the second piezo-electric element 160 is expanded by receiving a forward voltage through the controller 90, and the flow path cross-sectional area of the orifice passage 35 can be reduced. Further, the second piezo-electric element 160 is contracted by receiving a voltage in the reverse direction from the controller 90, and the cross-sectional area of the flow path of the orifice passage 35 can be increased.

The operation of the variable damper 200 according to another embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

5, in the embodiment of the present invention, the first piezo element 50 is compressed by the load input to the piston head 30 through the piston rod 20 and generates a voltage corresponding thereto.

At the same time, the controller 90 compares the amount of vibration or the amount of impact acting on the piston rod 20 with a predetermined reference value, and if it is determined that 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 50 is applied to the electrode layer 161 of the second piezo element 160 in the forward direction.

Then, the piezoelectric layer 163 of the second piezo-electric element 160 is expanded in response to the forward voltage from the controller 90, thereby reducing the cross-sectional area of the flow path of the orifice passage 35.

Therefore, in the embodiment of the present invention, by increasing the flow resistance of the fluid in the cylinder 10 flowing through the orifice passage 35, the damping force at the time of the impact load due to abrupt compression can be rapidly increased.

6, the controller 90 compares the amount of vibration or the amount of impact acting on the piston rod 20 with a predetermined reference value, and if it is determined that the amount of vibration or the amount of impact is smaller than the reference value, The voltage supplied from the first piezo element 50 is applied to the electrode layer 161 of the second piezo element 160 in the reverse direction.

The piezoelectric layer 163 of the second piezo-electric element 160 is then contracted by a voltage applied from the controller 90 in the reverse direction, thereby causing the cross-sectional area of the flow path of the orifice passage 35 to be Increase.

Accordingly, in the embodiment of the present invention, by reducing the flow resistance of the fluid in the cylinder 10 flowing through the orifice passage 35, a relatively small damping force can be generated and the vibration or the impact force can be attenuated.

The rest of the configuration and effects of the variable damper 200 according to another embodiment of the present invention as described above are the same as those in the electric embodiment, and thus a detailed description thereof will be omitted.

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

Referring to FIG. 7, a variable damper 300 according to another embodiment of the present invention includes a piezoelectric element 260 such as a second piezo element, (Not shown).

In the embodiment of the present invention, the piezo element 260 is based on the same structure as in the electric embodiment, and when a voltage is applied by the controller 290, expansion and contraction occurs, Lt; RTI ID = 0.0 > and / or < / RTI >

That is, when the forward voltage is applied to the upper electrode layer 261 by the controller 290, the piezo element 260 can shrink the piezoelectric layer 263. The piezoelectric element 260 can expand the piezoelectric layer 263 when a voltage in the opposite direction is applied to the upper electrode layer 261 by the controller 290.

In this case, if it is determined that the amount of vibration acting on the piston rod 220 is larger than the predetermined reference value, the controller 290 sets the forward voltage to the electrode layer 261 of the piezoelectric element 260 The piezoelectric layer 263 can be contracted.

When it is determined that the amount of vibration acting on the piston rod 220 is smaller than the reference value, the controller 290 applies a reverse voltage to the electrode layer 261 of the piezo element 260, The layer 263 can be expanded.

In the meantime, since the specific configuration of the valve assembly 270 in the embodiment of the present invention is the same as the configuration disclosed in the first embodiment, a detailed description thereof will be omitted below.

Therefore, in the variable damper 300 according to another embodiment of the present invention configured as described above, the controller 290 compares the amount of vibration acting on the piston rod 220 with a predetermined reference value, The voltage in the forward direction is applied to the electrode layer 261 of the piezoelectric element 260.

In the embodiment of the present invention, the piezo layer 263 of the piezo element 260 is contracted due to the forward voltage from the controller 290, so that the base plate 271 of the valve assembly 270 And the flow path cross-sectional area of the orifice passage 235 is reduced through the valve body 273.

Accordingly, in the embodiment of the present invention, by increasing the flow resistance of the fluid in the cylinder 210 flowing through the orifice passage 235, the damping force at the time of the impact load due to abrupt compression can be rapidly increased.

In contrast, in the embodiment of the present invention, the controller 290 compares the amount of vibration acting on the piston rod 220 with a predetermined reference value. If it is determined that the vibration amount is smaller than the reference value, 261 in the opposite direction.

In the embodiment of the present invention, the piezo layer 263 of the piezo element 260 is applied with a voltage in the reverse direction from the controller 290 to expand. As a result, the base plate 271 of the valve assembly 270 The flow path cross-sectional area of the orifice passage 235 is increased through the valve body 273.

Therefore, in the embodiment of the present invention, by reducing the flow resistance of the fluid in the cylinder 210 flowing through the orifice passage 235, a relatively small damping force can be generated and the vibration or impact force can be damped.

The rest of the configuration and effects of the variable damper 300 according to still another embodiment of the present invention are the same as those in the first embodiment, and a detailed description thereof will be omitted.

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, 210 ... cylinders 20, 220 ... piston rods
30 ... piston head 31 ... upper chamber
32 ... lower chamber 35, 235 ... orifice channel
41 ... gas chamber 43 ... diaphragm
50 ... first piezo elements 60, 160, 260 ... second piezo elements
61, 161, 261 ... Electrode layers 63, 163, 263 ... piezo layer
70, 270 ... valve assembly 71, 271 ... base plate
73, 273 ... valve body 90, 290 ... controller

Claims (13)

A cylinder filled with a working fluid;
A piston rod disposed to penetrate from the outside to the inside of the cylinder;
A plurality of orifices connected to an end of the piston rod in the cylinder and movable in a vertical direction and partitioning the interior of the cylinder into an upper chamber and a lower chamber, A piston head forming a flow path;
A first piezo element provided between the piston rod and the piston head, the first piezo element being compressed by a load applied to the piston head and generating a corresponding voltage;
A second piezo element provided on a lower surface of the piston head and electrically connected to the first piezo element, the second piezo element being contracted and expanded by receiving the voltage from the first piezo element through a controller; And
A valve assembly fixed to the second piezo element and vertically moved by the second piezo element to regulate a flow path cross-sectional area of the orifice passage;
. The method according to claim 1,
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. 3. The method of claim 2,
Wherein the second piezo element comprises:
And the valve assembly is contracted according to a direction of a voltage applied by the controller to move the valve assembly in an upward direction, thereby reducing a flow path cross-sectional area of the orifice passage. The method of claim 3,
Wherein the second piezo element comprises:
Wherein the valve assembly is inflated according to a direction of a voltage applied by the controller to move the valve assembly in a downward direction and to increase the cross-sectional area of the flow path of the orifice passage. The method according to claim 1,
The valve assembly includes:
A base plate fixed to the second piezo element,
And a valve body mounted on the base plate and varying a flow path cross-sectional area of the orifice passage. 6. The method of claim 5,
Wherein the piston head, the second piezo element, and the base plate are joined by bonding or fastening. A cylinder filled with a working fluid;
A piston rod disposed to penetrate from the outside to the inside of the cylinder;
A plurality of orifices connected to an end of the piston rod in the cylinder and movable in a vertical direction and partitioning the interior of the cylinder into an upper chamber and a lower chamber, A piston head forming a flow path;
A first piezo element provided between the piston rod and the piston head, the first piezo element being compressed by a load applied to the piston head and generating a corresponding voltage; And
A second piezo element provided in the orifice passage and electrically connected to the first piezo element, the second piezo element being contracted and expanded by receiving the voltage from the first piezo element through the controller;
. 8. The method of claim 7,
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. 9. The method of claim 8,
Wherein the second piezo element comprises:
Wherein the valve is inflated according to a direction of a voltage applied by the controller to reduce a flow path cross-sectional area of the orifice passage. 10. The method of claim 9,
Wherein the second piezo element comprises:
Wherein the valve body is contracted according to a direction of a voltage applied by the controller to increase a flow path cross-sectional area of the orifice passage. A cylinder filled with a working fluid;
A piston rod disposed to penetrate from the outside to the inside of the cylinder;
A plurality of orifices connected to the end of the piston rod in the cylinder and movable in the vertical direction to divide the interior of the cylinder into an upper chamber and a lower chamber, A piston head forming a flow path;
A piezoelectric element provided on a bottom surface of the piston head and contracted and expanded upon receiving a predetermined voltage; And
A valve assembly fixed to the piezo element and vertically moved by the piezo element to regulate a flow path cross-sectional area of the orifice passage;
. 12. The method of claim 11,
Wherein the piezo element contracts and expands according to a direction of a voltage applied by the controller. 13. The method of claim 12,
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 through the piston rod.
KR1020150063350A 2015-05-06 2015-05-06 Variable damper KR101683503B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06219127A (en) * 1993-01-29 1994-08-09 Toyota Motor Corp Control device for vibration damping device
KR20010028332A (en) * 1999-09-21 2001-04-06 이계안 A damping force controlling apparatus for shock absorber
JP2008223911A (en) * 2007-03-13 2008-09-25 Honda Motor Co Ltd Damper structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06219127A (en) * 1993-01-29 1994-08-09 Toyota Motor Corp Control device for vibration damping device
KR20010028332A (en) * 1999-09-21 2001-04-06 이계안 A damping force controlling apparatus for shock absorber
JP2008223911A (en) * 2007-03-13 2008-09-25 Honda Motor Co Ltd Damper structure

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