KR20210085819A - Hydraulic Damper for Micro Vibration Absorption - Google Patents

Abstract

The present invention relates to a hydraulic damper for absorbing micro-vibration. More particularly, the present invention comprises: a cylinder filled with oil; a piston inserted to be movable into the cylinder; one or more springs positioned in an upper portion and a lower portion of the piston in the cylinder, respectively; a first orifice positioned in the upper portion of the cylinder; a second orifice positioned in the lower portion of the cylinder; and a flow passage positioned inside the cylinder and connected to the first orifice and the second orifice. Therefore, the present invention can reduce a size of the hydraulic damper and absorbs micro-vibration through improvement of performance of the damper.

Description

Hydraulic Damper for Micro Vibration Absorption

The present invention relates to a hydraulic damper for absorbing fine vibrations used to stably operate an external device by absorbing fine vibrations generated from an external device.

Since springs of automobile suspensions usually use low friction ones, they continue to vibrate when jumping over obstacles. When the vibration continues, the vibration is transmitted to the vehicle, reducing steering safety and riding comfort, and by absorbing these vibrations, a damper is used to improve steering stability and ride comfort.

A hydraulic damper is mainly used in vehicles to absorb vibration, and when the piston is pressed by an impact force, the oil under the piston passes through an orifice and moves through the flow path. shock and vibration are absorbed.

In the hydraulic damper mainly used in vehicles, the piston located inside the cylinder performs expansion and contraction strokes by the piston rod, and at this time, the oil inside the cylinder moves by the orifice and vibration is absorbed.

The conventional hydraulic damper has a structure in which oil passes through an orifice in the piston according to the movement of the piston, but in this case, it is difficult to control the orifice, and the spring is located outside the cylinder, limiting the amount of vibration absorption of the hydraulic damper There is a problem in that the overall size of the hydraulic damper increases.

Republic of Korea Patent Publication No. 10-2008-0034869 (published on April 22, 2008)

An object of the present invention is to provide a hydraulic damper that easily absorbs minute vibrations by forming an interlocking flow path through two orifices inside a cylinder to solve the above technical problem.

In another aspect, an object of the present invention is to simplify the size of the hydraulic damper by locating the spring inside the hydraulic damper.

A hydraulic damper according to an embodiment of the present invention for solving the above technical problem is a cylinder filled with oil, a piston movably fitted in the cylinder, and one or more springs positioned above and below the piston in the cylinder. , a first orifice positioned above the cylinder, a second orifice positioned below the cylinder, and a flow path positioned inside the cylinder and connected to the first orifice and the second orifice.

In addition, the first orifice and the second orifice may be composed of one or more.

In addition, one or more passages may be present in the cylinder.

In addition, the first orifice, the second orifice, and the flow path may have a cross-section in any one of a circular shape and a polygonal shape.

In addition, when the piston is extending stroke, the oil moves to the lower part of the cylinder through the second orifice along the flow path, and when the piston is contracting stroke, the oil flows through the first orifice along the flow path. It can be operated by moving to the upper part of the cylinder.

In addition, the spring may be configured as an anticorrosive spring.

The hydraulic damper according to an embodiment of the present invention described above can control the orifice by configuring a hydraulic circuit in the cylinder.

In the hydraulic damper according to an embodiment of the present invention, the size of the hydraulic damper may be reduced by applying a spring inside the cylinder.

Since the hydraulic damper according to an embodiment of the present invention operates by using both oil and a spring, damping performance is increased, so that even minute vibrations can be absorbed.

1 is a three-dimensional perspective view of a hydraulic damper according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional configuration view of the hydraulic damper of FIG. 1 .
3 is a cross-sectional configuration view of a hydraulic damper according to a second embodiment of the present invention.
4 is a cross-sectional configuration view of a hydraulic damper according to a third embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail.

However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, in order to facilitate the overall understanding, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a perspective view of a hydraulic damper according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional configuration view of the hydraulic damper of FIG. 1 .

As shown, the hydraulic damper 100 according to an embodiment of the present invention includes a piston 110, a cylinder 120, springs 131 and 132, a first orifice 141, a second orifice 142, It may be composed of a flow path 150 and a piston guide 160 .

A cylindrical groove is present inside the cylinder 120 and may include oil, a piston 110, and springs 131 and 132 in the cylindrical groove. In one embodiment of the present invention, the groove positioned inside the cylinder 120 is disclosed as a cylindrical shape, but the shape includes both a cylindrical shape, a polygonal shape, and the like, and may be freely formed according to the shape of the piston 110 . In one embodiment of the present invention, the fluid inside the cylinder 120 is described as oil, but it is a self-evident fact that any fluid having no problem in performing the operation of the hydraulic damper 100 may be used.

The piston 110 may be composed of a plate and a piston rod extending from one surface of the plate. The plate may be configured to be substantially equal to the diameter of a cylinder within the cylinder 120 . The piston 110 may operate while reciprocating within the cylinder 120 . And based on the plate, the inside of the cylinder may be divided into two spaces: an upper plate and a lower plate.

The piston rod may suppress left and right movement by the piston guide 160 , and the piston guide 160 may prevent oil inside the cylinder 120 from leaking to the outside.

The springs 131 and 132 are located inside the cylinder 120 , and are provided on the upper and lower sides of the plate, respectively, based on the drawing, to reduce vibration caused by the movement of the piston 110 . Here, one or more springs may be provided, respectively.

The springs 131 and 132 may serve to minimize the movement of the plate by using elasticity in connection with the plate. In addition, since it is located in a state not connected to the plate, the plate contacts the springs 131 and 132 before it comes into contact with the bottom surface of the cylinder 120 or the piston guide 160 to receive an impact by the elasticity of the springs 131 and 132 . It may be in the form of absorption.

The spring 130 is formed of an anticorrosive spring that is subjected to anticorrosion treatment so as not to be corroded by oil, and is composed of springs such as coil springs (CS) and leaf springs, synthetic resins, rubbers or elastic bodies made of synthetic rubbers, etc. It can be used without limitation as long as it is an elastic series capable of absorbing the movement of the piston 110 .

That is, the springs 131 and 132 are respectively located on the upper and lower surfaces of the plate of the piston 110 inside the cylinder 120, and may or may not be connected to the plate, and the piston 110 performs a reciprocating operation by an external impact. In this case, if the movement of the piston 110 can be absorbed by using elasticity, it can have various numbers, shapes, and connection states.

The cylinder 120 may include a first orifice 141 , a second orifice 142 , and a flow path 150 .

The orifice is a hole installed inside a pipe through which a fluid passes in order to facilitate the flow of oil and ejecting the fluid.

In an embodiment of the present invention, the first orifice 141 is located on the bottom surface of the groove inside the cylinder 120 , and in detail, between the lowest point located during the contraction stroke of the piston 110 and the bottom surface of the cylinder 120 . can be located in

The second orifice 142 is located in the cylinder 120 of the lower end surface side of the piston guide 160, and in detail, it can be located between the piston guide 160 and the highest point located during the extension stroke of the piston 110. have.

In an embodiment of the present invention, the first orifice 141 and the second orifice 142 are disclosed as being positioned on a straight line, but the present invention is not limited thereto and the first orifice 141 and the second orifice 142 are not limited thereto. It may be located anywhere in the cylinder 120 as long as it is a position that does not interfere with performing the operation according to the embodiment of the present invention.

In addition, if the first orifice 141 and the second orifice 142 can connect the inside of the cylinder 120 and the flow path 150 , such as circular, polygonal, oval, etc., the shape is not limited, and the same as the flow path 150 . It can be shaped so that it does not interfere with the movement of the fluid.

The first orifice 141 and the second orifice 142 may be connected by a flow path 150 . The flow path 150 is preferably configured in a straight shape, but may also be formed in a curved shape to extend the length of the flow path 150 .

The flow path 150 is a pipe through which the fluid contained in the cylinder 120 flows, and there is no limitation thereto as long as it has a shape in which the fluid can flow. In an embodiment of the present invention, a rectangular shape is cut for convenience in the drawing. Although disclosed in a triangular shape, it may also be configured in a polygonal shape such as a triangle or a quadrangle and a circular shape or an oval shape.

Hereinafter, the operation of the hydraulic damper 100 will be described in detail.

When vibration occurs from the outside, the piston 110 repeats contraction and expansion strokes due to external vibration. The space size of the upper and lower parts of the piston 110 is changed based on the contraction and extension strokes, and the oil in the cylinder 120 moves to the upper part and the lower part of the cylinder 120 along the flow path 150 according to the change in the space size. It can move and absorb vibrations. In addition, the piston 110 presses the springs 131 and 132 positioned at the upper and lower portions of the piston 110 according to the contraction and extension strokes and additionally absorbs vibrations.

Specifically, when the piston 110 performs a contraction stroke, as the piston 110 descends, the spring 131 at the bottom of the piston 110 is compressed by the piston 110 and absorbs the shock of the piston 110 . . In addition, as the piston 110 descends, the oil in the cylinder 120 flows into the flow path 150 through the first orifice 141 , and the oil in the flow path 150 flows through the second orifice 142 at the top of the cylinder. will move to

When the piston 110 performs the extension stroke, as the piston 110 rises, the spring 132 at the upper end of the piston 110 is compressed by the piston 110 and absorbs the shock of the piston 110 . In addition, as the piston 110 rises, the oil in the cylinder 120 flows to the flow path 150 through the second orifice 142 , and the oil in the flow path 150 flows through the first orifice 141 at the lower end of the cylinder. will move to

By the contraction stroke and extension stroke of the piston 110, the oil moves up and down the piston 110 along the flow path 150 into the flow path through the first and second orifices 141 and 142. It is possible to control the flowing oil, and by controlling the movement of the oil, the control of the hydraulic damper 100 is easier compared to the conventional product.

In the first embodiment disclosed in FIG. 2 , a method of configuring and operating two orifices and one flow path has been described as a reference, but referring to the second embodiment of FIG. 3 , the present invention is not a single flow path but two or more flow paths. may include, and thus the orifice may also be configured in a number of more than two or more.

For example, one flow path is composed of two orifices, the flow path is divided into two branches and the two orifices have two flow paths, and the inside of the cylinder is symmetrical to the cylinder and consists of 4 orifices and 2 flow paths. As long as there is a flow path in the air and oil can flow to the upper and lower parts of the cylinder through the orifice, there is no problem in any shape.

In the first embodiment disclosed in FIG. 2 , one embodiment is provided in which one spring 131 , 132 is positioned at the upper and lower portions of the piston 110 , respectively, but referring to FIG. 4 , the present invention as shown in FIG. 4 . The hydraulic damper 100 of the piston 110 is composed of one or more springs on the upper and lower portions of the piston 110, respectively, and may be configured in a form to control elasticity, and the spring is also composed of different lengths, not the same length, and the piston 110 ) can be dynamically absorbed.

Through this configuration, the hydraulic damper 100 of the present invention can control the movement of oil through the orifices 141 and 142 by forming a flow path inside the cylinder 120 , and a spring inside the cylinder 120 . By locating (131, 132), the size of the hydraulic damper 100 can be reduced. In addition, the hydraulic damper 100 of the present invention improves damping performance by locating oil and a spring inside the cylinder 120 together and can absorb fine vibrations better compared to the prior art.

Features, structures, effects, etc. described in the above-described embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong.

Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention. In addition, although the embodiments have been described above, these are merely examples and do not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications that have not been made are possible. For example, each component specifically shown in the embodiments can be implemented by modification. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

100: hydraulic damper
110: piston
120: cylinder
131, 132: spring
141, 142: first and second orifices
150: Euro
160: piston guide

Claims (6)

cylinder filled with oil;
a piston movably fitted in the cylinder;
One or more springs respectively positioned at the upper and lower portions of the piston in the cylinder;
a first orifice positioned above the cylinder;
a second orifice positioned below the cylinder; and
a flow path positioned inside the cylinder and connected to the first orifice and the second orifice;
Hydraulic damper comprising a. According to claim 1,
The hydraulic damper according to claim 1, wherein the first orifice and the second orifice are composed of one or more. According to claim 1,
The hydraulic damper, characterized in that at least one flow path is present inside the cylinder. According to claim 1,
The hydraulic damper, characterized in that the first orifice, the second orifice and the flow passage are formed in any one of a circular shape and a polygonal cross section. According to claim 1,
When the piston is in an extension stroke, the oil moves along the flow path to the upper part of the cylinder through the second orifice, and when the piston is in a contracting stroke, the oil moves along the flow path through the first orifice to the lower part of the cylinder Hydraulic damper characterized in that it moves to. According to claim 1,
The spring is a hydraulic damper, characterized in that consisting of an anticorrosive spring.

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