KR20200141298A - Shock absorber - Google Patents

Abstract

Disclosed is a shock absorber. The shock absorber includes: an inner tube filled with oil fluids; an outer tube provided on the outer circumference of the inner tube to be filled with gas fluids and oil fluids; a piston valve performing compression and tension strokes in the inner tube; and a piston rod connected with the piston valve to be extended to the outside of the inner tube. According to an embodiment of the present invention, the shock absorber includes: a body part provided at a predetermined height on the outer tube to be fixed, and including first and second flow paths penetrating the inside; and a ball member controlling the flow of the oil fluids while ascending and descending due to the compression and tension strokes of the piston valve, and an elastic member elastically transformed in accordance with the movement of the ball member. The ball member and the elastic member can be provided to control the flow of the oil fluids flowing through the second flow path. Therefore, the present invention is capable of improving the performance and reliability of a product.

Description

Shock absorber {SHOCK ABSORBER}

The present invention relates to a shock absorber that generates an additional damping force during a compression stroke.

In general, a shock absorber serves to suppress or attenuate vibration from a road surface, and absorbs vibration energy in the vertical direction of the vehicle body when mounted between a vehicle body or a frame and a wheel. Among such shapes of the shock absorber, the abdominal type shock absorber includes a cylinder provided with an inner tube and an outer tube, and a piston rod slidably accommodated in the inner tube, and the cylinder is connected to the wheel side through a suspension arm, etc. The piston rod is connected to the vehicle body side, and a piston valve is connected to the lower end of the piston rod.

Accordingly, the shock absorber can perform a function of suppressing and attenuating vibration transmitted from the road surface to the vehicle body while continuously repeatedly performing a compression stroke and a rebound stroke when the vehicle travels on an irregular road surface. . Here, the piston valve allows fluid to move in one direction by the pressing force of the disk, but the disk is opened or closed with respect to the flow path due to a pressure difference between the tension chamber and the compression chamber due to the expansion or contraction of the shock absorber. As the disk is tilted by the flow rate passing through the slit of the disk, a general damping force may be generated.

Meanwhile, in order to obtain an additional damping force during the compression stroke, a separate housing with an orifice hole was conventionally installed inside the inner tube. More specifically, during the compression stroke, the piston rod descending to a predetermined height or less is introduced into the housing to form a chamber. When the additional compression stroke proceeds, the fluid in the chamber is discharged through the orifice hole, and additional damping force may be generated through this. However, if the housing is placed inside the inner tube as in the prior art, noise may be generated by contact between the piston rod and the metal material of the housing during the descending process, and damage to the piston rod and the housing may occur. There is a problem. In addition, since the piston rod and the above-described housing must be coaxially arranged and assembled, there is a problem that the assembly cost or parts management cost may be excessively consumed in the production process.

Korean Patent Publication No. 2006-0102691 (published on September 28, 2006)

The present embodiment is to provide a shock absorber capable of stably generating an additional damping force during a compression stroke.

The present embodiment aims to provide a shock absorber capable of reducing the number of parts and thus reducing the weight of the product.

The present embodiment is to provide a shock absorber with improved performance and operational reliability.

The present embodiment is intended to provide a shock absorber capable of improving product assembly and productivity while reducing the manufacturing cost of the product.

According to an aspect of the present invention, an inner tube filled with oil fluid, an outer tube provided around an outer circumference of the inner tube and filled with gas fluid and oil fluid, and a piston valve performing compression and tensioning within the inner tube And, in the shock absorber comprising a piston rod connected to the piston valve and extending out of the inner tube, the shock absorber is provided at a predetermined height and fixed to the outer tube, and a first flow path and a second flow path passing through the inside are provided. A ball member disposed inside the body portion and the second flow path and controlling the flow of the oil fluid while rising and falling by the compression and tension stroke of the piston valve, and an elastic member elastically deformed according to the movement of the ball member Including, but the ball member and the elastic member may be provided and provided to control the flow of the oil fluid passing through the second flow path.

In addition, the ball member and the elastic member may be provided so as to allow the flow of the gas fluid through the second flow path during the compression stroke of the piston valve, but to block the flow of the oil fluid.

In addition, the second flow path includes a first flow path portion provided with a space in which the ball member rises and descends, a slope portion having a lower end connected to the first flow path portion, and a smaller inner diameter toward the upper end, and an upper end portion of the slope portion. It includes a second flow path to be connected, and the ball member may be provided so as to contact the inclined portion during the compression stroke of the piston valve.

In addition, the second flow path further includes an extension part extending outwardly from a lower end of the inclined part to be connected to the first flow path part, and the elastic member is elastically supported by the extension part at one side and the other side at the ball member. It may be provided with elastic support.

In addition, the ball member rises to the upper end of the first flow path part by the oil fluid flowing into the first flow path part during the compression stroke of the piston valve, and the elastic member is maximally compressed by the lifting operation of the ball member. , It may be provided and provided to block the inflow of the oil fluid into the second flow path.

In addition, a stopper member provided at a lower end of the first flow path portion may be further provided to prevent the ball member from being separated from the outside.

In addition, the stopper member may be provided including a flow path allowing the flow of the gas fluid and the oil fluid during compression and tensioning of the piston valve.

In addition, the stopper member may include a plurality of legs arranged parallel to the inner wall of the first flow path, and a plate connecting the lower end of the leg in a horizontal direction.

In addition, the ball member may be provided so as to be supported by the plurality of legs during a tensile stroke of the piston valve.

In addition, the body portion may be provided in a cylindrical shape with a hollow portion formed in the center.

The shock absorber according to the present embodiment may stably provide additional damping force during the compression stroke.

The shock absorber according to the present embodiment can reduce the number of parts, and reduce the size and weight of the product.

The shock absorber according to the present embodiment may improve product performance and operational reliability.

The shock absorber according to an embodiment of the present invention can reduce the manufacturing cost of the product while improving the assembly properties and productivity of the product.

1 is a cross-sectional view of a shock absorber according to an embodiment of the present invention.
2 is an enlarged view of part A of FIG. 1 with respect to the body part according to an embodiment of the present invention.
3 is a perspective view of a body portion according to an embodiment of the present invention.
4 is a view showing a process in which a general damping force is generated during a compression stroke of a piston valve of a shock absorber according to an embodiment of the present invention.
5 is a diagram illustrating a process in which a damping force is generated during an additional compression stroke after the compression stroke of FIG. 4.
6 is a diagram showing a process in which a damping force is generated during a tensile stroke after the compression stroke of FIG. 4.
7 is a diagram illustrating a process in which a damping force is generated during a tensile stroke after the compression stroke of FIG. 5.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are presented in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the exemplary embodiments presented here, but may be embodied in other forms. In the drawings, in order to clarify the invention, the illustration of parts irrelevant to the description may be omitted, and the size of the component may be slightly exaggerated to help understanding.

1 is a cross-sectional view of a shock absorber according to an embodiment of the present invention, FIG. 2 is an enlarged view of A part of FIG. 1 with respect to a body part according to an embodiment of the present invention, and FIG. 3 is a body according to an embodiment of the present invention. It is a perspective view of wealth.

Referring to FIG. 1, a shock absorber 1 according to an embodiment of the present invention includes an inner tube filled with an oil fluid 12 and a gas fluid 11 and an oil fluid 12 provided around the outer circumference of the inner tube. The piston valve 4 is installed to be slid up and down in the outer tube 3 to be filled and the inner tube 2 to divide the inner tube 2 into a tension chamber 13 and a compression chamber 14. ), a piston rod 5 connected to the piston valve 4 and extending to the outside of the inner tube 2, and a body valve 6 installed under the inner tube 2.

The piston valve 4 and the body valve 6 are provided with a first communication path 21 and a second communication path 22 for generating damping force by allowing the flow of the working fluid according to the tension stroke and the compression stroke, respectively.

2 and 3, the shock absorber 1 according to the embodiment of the present invention includes a body 30 fixed to the outer tube 3 and provided to have a predetermined height, and the inside of the second flow path 32. The ball member 33 and the ball member 33 are arranged to adjust the flow of the oil fluid 12 and elastically deformed according to the movement of the ball member 35, and the ball member 33 is prevented from being separated from the outside. It includes a stopper member (34).

The body part 30 includes a first flow path 31 and a second flow path 32 provided to penetrate the inside. Particularly, the inside of the second flow path 32 rises according to the compression stroke of the piston valve 4 and descends according to the tension stroke of the piston valve 4, and the upward motion of the ball member 33 An elastic member 35 which is compressed according to and is elastically deformed while being stretched according to the downward motion of the ball member 33 is disposed. The body portion 30 is provided in the outer tube 3 surrounding the outer periphery of the inner tube 2, and a hollow portion capable of accommodating the inner tube 2 may be formed in the center. That is, the body part 30 may be provided as a cylindrical shape in which a hollow part is formed. On the other hand, in this embodiment, the first flow path 31 and the second flow path 32 are described as flow paths provided inside the body portion 30, but two or more flow paths may be formed in the body portion 30. In addition, it should be understood the same even when the ball member 33 is disposed in at least one of the plurality of flow paths.

The second flow path 32 includes a first flow path part 32c and a second flow path part 32a, a lower end part connected to the first flow path part 32c, and an upper end part inclined part connected to the second flow path part 32a. (32b) is provided. A space through which the ball member 33 can rise and fall is provided in the first flow path 32c. The inclined portion 32b is provided so that the inner diameter decreases from the bottom to the top, and thus, the lower end of the inclined portion 32b having the largest inner diameter is connected to the first flow passage 32c, and the upper end having the smallest inner diameter 2 It is connected to the flow path part 32a. Meanwhile, the second flow path 32 may further include an extension portion extending outward from the lower end of the inclined portion 32b to connect the lower end of the inclined portion 32b and the first flow path 32c. That is, the inner diameter of the first flow path 32c may be provided larger than the inner diameter of the lower end of the inclined portion 32b by the length of the extension, and the inner diameter of the second flow path 32a is the upper end of the inclined portion 32b. It can be provided the same as the inner diameter. One side of the elastic member 35 may be elastically supported by the above-described extension portion, and the other side may be elastically supported by the ball member 33.

Meanwhile, during the above-described compression stroke, the ball member 33 and the elastic member 35 block the flow of the oil fluid 12 passing through the second flow path 32, but allow the flow of the gas fluid 11. Can be provided.

The stopper member 34 is disposed at the lower end of the first flow path part 32c to prevent the ball member 33 from being separated from the first flow path part 32c. The stopper member 34 includes a plurality of legs arranged parallel to the inner wall of the first flow path part 32c, and a plate connecting the lower ends of the legs to each other in the horizontal direction. For example, a plurality of legs may be disposed on the plate at equal intervals. The ball member 33 descends along the first flow path part 32c while the oil fluid 12 flows out from the outer tube 3 to the inner tube 2 during the tensile stroke of the piston valve 4. Thereafter, the lowered ball member 33 may be seated and supported on the aforementioned leg. On the other hand, the stopper member 34 may include a flow path allowing not only the gas fluid 11 but also the oil fluid 12 to flow at one side. The position of the flow path of the stopper member 34 may be selectively adopted according to the structure of the stopper member 34, and for example, the flow path of the stopper member 34 may be formed in the center of the above-described plate.

Hereinafter, an operation in which the shock absorber generates a damping force according to the present embodiment will be described.

4 is a view showing a process in which a general damping force is generated during a compression stroke of a piston valve of a shock absorber according to an embodiment of the present invention, and FIG. 5 is a view showing a process of generating a damping force during an additional compression stroke after the compression stroke of FIG. It is a drawing.

4, when the piston valve 4 performs a compression stroke, as the pressure in the compression chamber 14 increases, some of the oil fluid 12 in the compression chamber 14 passes through the first communication path 21. Pass through. At this time, the oil fluid 12 passes through the first communication path 21 and flows into the tension chamber 13, while simultaneously moving to the outer tube 3 through the second communication path 22, generating a damping force. Let it. Due to the pressure of the oil fluid 12 flowing from the inner tube 2 to the outer tube 3, the gas fluid 11 filled in the upper portion of the oil fluid 12 in the outer tube 3 is preferentially It passes through the body portion 30, and at this time, the gas fluid 11 may generate a damping force while passing through the second flow path 32 as well as the first flow path 31 of the body portion 30. More specifically, the ball member 33 disposed in the second flow path 32 during the above-described compression stroke is the first flow path part 32c by the pressure of the fluid flowing from the inner tube 2 to the outer tube 3. Ascending along, the elastic member 35 may be compressed according to the lifting operation of the ball member 33. At this time, due to the low viscosity of the gas fluid 11, the elastic member 35 can be compressed only to the extent that a gap is formed therein, and the flow of the gas fluid 11 can be allowed by the gap described above. In other words,

Referring to FIG. 5, after the gas fluid 11 filled in the lower portion of the body 30 has passed through the first flow path 31 and the second flow path 32, the oil fluid 12 is a first flow path. While it can pass through 31, the oil fluid 12 flowing into the first flow path 32c blocks the flow to the second flow path 32a by the ball member 33 and the elastic member 35 Can be. More specifically, when the oil fluid 12 flows into the first flow path 32c, the ball member 33 may rise to the upper end of the first flow path 32c due to the viscosity of the oil fluid 12. . Accordingly, the elastic member 35 can be compressed to the maximum so that a gap through which a fluid can pass cannot be formed, and thus the flow of the oil fluid 12 to the second flow path 32a can be blocked. That is, when the oil fluid 12 passes through the body portion 30 during the compression stroke, the number of flow paths of the body portion 30 that allows the fluid to flow through the gas fluid 11 passes through the body portion 30. It decreases compared to time, and additional damping force may be generated in this process. In addition, the difference in viscosity between the gas fluid 11 and the oil fluid 12 affects the flow resistance of the fluid passing through the body portion 30. That is, when the oil fluid 12 passes through the body portion 30, the flow resistance of the fluid increases compared to when the gas fluid 11 passes through the body portion 30, and this also increases an additional damping force. It can be a possible factor.

FIG. 6 is a diagram illustrating a process of generating a damping force during a tensile stroke after the compression stroke of FIG. 4, and FIG. 7 is a diagram illustrating a process of generating a damping force during a tensile stroke after the compression stroke of FIG. 5.

Referring to FIG. 6, when the tensioning stroke is performed in the opposite direction after the compression stroke of FIG. 4, as the pressure in the tensioning chamber 13 increases, some of the oil fluids 12 in the tensioning chamber 13 become the first communication path 21 ) To generate damping force. At this time, the oil fluid 12 passes through the first communication path 21 and flows into the compression chamber 14, while some fluids in the outer tube 3 pass through the second communication path 22 to the compression chamber ( 14) and generate damping force. On the other hand, during the tensioning stroke of the piston valve 4, the elastic member 35 disposed in the second flow path 32 is tensioned and at the same time, the ball member 33 descends along the first flow path part 32c to stop the stopper member 34. ) Supported by the legs. At this time, the stopper member 34 includes a flow path through which the gas fluid 11 passes. That is, during the above-described tensioning stroke of the piston valve 4, the gas fluid 11 filled in the upper portion of the body portion 30 is the first flow path 31 and the second flow path 32 of the body portion 30. Damping force can be generated while passing through.

Referring to FIG. 7, when the tensioning stroke is performed in the opposite direction after the compression stroke of FIG. 5, as the pressure in the tensioning chamber 13 increases, some of the oil fluids 12 in the tensioning chamber 13 become the first communication path 21 While flowing to the compression chamber 14 through ), some fluid in the outer tube 3 moves to the compression chamber 14 through the second communication path 22 to generate a damping force. At this time, the flow path of the stopper member 34 allows not only the gas fluid 11 but also the oil fluid 12 to flow. That is, during the above-described tensile stroke of the piston valve 4, the oil fluid 12 filled in the upper portion of the body portion 30 is the first flow path 31 and the second flow path 32 of the body portion 30. Damping force can be generated while passing through. Unlike the compression stroke shown in FIG. 5, during the above-described tension stroke, there is no change in the number of flow paths of the body portion 30 allowing the flow of fluid, and thus no additional damping force is generated.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent range of the claims to be described.

1: shock absorber, 2: inner tube,
3: outer tube 4: piston valve
5: piston rod 6: body valve
11: gas fluid 12: oil fluid
13: tension chamber 14: compression chamber
21: first passage 22: second passage
30: body portion 31: first flow path
32: second flow path 33: ball member
34: stopper member 35: elastic member

Claims (10)

An inner tube filled with oil fluid, an outer tube provided around the outer periphery of the inner tube and filled with gas fluid and oil fluid, a piston valve that performs compression and tension strokes within the inner tube, and is connected to the piston valve. In the shock absorber comprising a piston rod extending outside the inner tube,
A body portion provided at a predetermined height and fixed to the outer tube and having a first flow passage and a second flow passage passing through the outer tube; And
Including; a ball member disposed inside the second flow path and rising and falling by the compression and tension stroke of the piston valve, and an elastic member elastically deformed according to the movement of the ball member,
The ball member and the elastic member
A shock absorber provided to control the flow of the oil fluid passing through the second flow path. The method of claim 1,
The ball member and the elastic member
A shock absorber provided to allow the flow of gas fluid through the second flow path during the compression stroke of the piston valve, but block the flow of the oil fluid. The method of claim 2,
The second flow path is
A first flow path portion provided with a space in which the ball member rises and descends, a lower end portion connected to the first flow passage portion, and an inclined portion whose inner diameter decreases toward the upper portion, and a second flow passage portion connected to the upper end portion of the inclined portion Shock absorber. The method of claim 3,
The second flow path is
Further comprising an extension part extending outward from the lower end of the inclined part and connected to the first flow path part,
The elastic member is
A shock absorber whose one side is elastically supported by the extension and the other side is elastically supported by the ball member. The method of claim 4,
The ball member
During the compression stroke of the piston valve, the oil fluid introduced into the first flow path increases to the upper end of the first flow path,
The elastic member is
A shock absorber that is compressed to a maximum by the raising operation of the ball member and is provided to block the inflow of the oil fluid into the second flow path. The method of claim 5,
A shock absorber further comprising a stopper member provided at a lower end of the first flow path part to prevent the ball member from being separated from the outside. The method of claim 6,
The stopper member
A shock absorber comprising a flow path allowing the gas fluid and oil fluid to flow during compression and tension strokes of the piston valve. The method of claim 7,
The stopper member
A shock absorber comprising a plurality of legs arranged parallel to an inner wall of the first flow path and a plate connecting a lower end of the leg in a horizontal direction. The method of claim 8,
The ball member
A shock absorber provided to be supported by the plurality of legs during a tensile stroke of the piston valve. The method of claim 1,
The body part is a shock absorber provided in a cylindrical shape with a hollow part formed in the center.

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