KR102061628B1 - Oil control valve - Google Patents

Abstract

Disclosed is an oil control valve which includes: a holder positioned on an oil passage connecting lubrication parts and a chamber for storing the oil, and having an inner space in the outward direction of the oil passage; a spool having a shape extending in the longitudinal direction and moving in the longitudinal direction while being inserted into the inner space of the holder and the oil passage to control the opening of the oil passage; and a control means for controlling the movement of the spool in the longitudinal direction of the spool in the inner space of the holder. The spool opens a portion of the oil passage even at a position that blocks opening of the oil passage.

Description

Oil Control Valve {OIL CONTROL VALVE}

The present invention relates to an oil control valve, and relates to an oil control valve for controlling a supply flow path of lubricating oil supplied to a clutch or a bearing inside a transfer case.

In the four-wheel drive vehicle 4WD, a transfer case that is a power transmission device for transmitting power of one of the front wheel and the rear wheel of the vehicle to the other is used. The transfer case includes a clutch that repeatedly compresses and detaches to distribute torque to the front wheels and the rear wheels, and lubrication of the clutch is essential during torque distribution.

In the transfer case, an oil pump for supplying oil when the engine is driven, and a mechanical oil pump or a separate oil supply device for churning supply oil for lubrication into the transfer case. Lubricant oil is applied to friction-producing parts to reduce frictional resistance and prevent wear of parts.

The oil control system inside the transfer case includes an oil control valve for supplying or cutting off the lubricating oil to the clutch, and the oil control valve is divided into a spool for controlling the flow of fluid and a hydraulic device for controlling the spool. .

1 shows a cross-sectional view of a transfer case according to the prior art, and FIG. 2 shows a perspective view of an oil control valve according to the prior art.

1 and 2, an oil control valve is positioned on an oil passage 100 between a chamber (not shown) for collecting and storing oil and a clutch 400 and a bearing 500. As the spool 300 of the oil control valve moves in the longitudinal direction, the oil flow path 100 is opened or the supply of oil is blocked so that the oil supplied from the chamber (not shown) is discharged to the clutch 400 and the bearing 500. Close the oil passage 100 as much as possible.

One side of the spool 300 is a spring 600 continuously providing a compression force, the fluid for controlling the compression force using the hydraulic pressure provided by the hydraulic device is located on the other side of the spool 300.

Therefore, the hydraulic transfer case is controlled to open the oil passage 100 so that the oil is discharged to the clutch 400 and the bearing 500 by moving the spool 300 in the longitudinal direction when the vehicle is switched to the 4WD driving mode. do.

However, in the transfer case, preload is always input in order to improve the response speed, and thus a load due to the fine slip is continuously generated in the clutch 400, but the spool 300 is blocked and the oil There is a problem that the supply of. In addition, there is a problem that the oil supply to the adjacent bearing 500 is blocked, and the lubricity of the bearing 500 is also lowered.

In addition, in order to improve the manufacturing deviation of the spring 600 for controlling the spool 300 and the airtightness of the fluid providing the hydraulic pressure on the other side of the spool 300 is inserted into the groove formed perpendicular to the longitudinal direction of the spool 300 Due to the sliding resistance (slip resistance) of the O-ring (O-ring), etc., a deviation occurs in opening of the oil channel 100 due to the movement of the spool 300, which makes it difficult to accurately control it.

Accordingly, according to the related art, even when the spool 300 cuts off the oil flow path 100, the clutch 400 is likely to be deteriorated in the long term due to the continuous load occurring, and the variation between the components of the spool 300 may occur. There is a problem in that a deviation occurs in the opening of the oil passage 100 of the spool 300 according to the above, and a variation occurs in the oil supply amount according to the opening degree of the oil passage 100.

The matters described as the background art are only for the purpose of improving the understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the related art already known to those skilled in the art.

KR 10-2018-0048272 A KR 10-2013-0066837 A

The present invention has been proposed to solve the above problems, and is intended to provide an oil control valve for continuously supplying a small amount of lubricating oil to a clutch or a bearing in a transfer case.

Oil control valve according to the present invention for achieving the above object is a holder which is located on the oil flow path connecting between the chamber for storing the oil and the lubricating parts, the inner space is formed in the outward direction of the oil flow path; A spool having a shape extending in the longitudinal direction and moving in the longitudinal direction while being inserted into the inner space of the holder and the oil flow path to control the opening of the oil flow path; And control means for controlling the movement of the spool in the longitudinal direction of the spool in the inner space of the holder, wherein the spool can open a portion of the oil passage even at a position that blocks the opening of the oil passage.

The lubricating part may be a clutch or a bearing inside the transfer case.

The spool has a first length having a constant length in the longitudinal direction of the spool, and indented inward to have a relatively small outer diameter, and the spool has both a first position and a first land where the first land is most exposed to the oil passage. The oil passage can be moved between second positions located outside.

A second land having a relatively small outer diameter may be formed by being indented inward on an outer circumferential surface of the spool exposed to the oil passage in a state where the spool is in the second position.

The control means includes an elastic body provided on one side in the longitudinal direction of the spool to continuously apply an elastic force to the spool, and the second position may be a position where the spool is maximally moved in the direction in which the elastic body applies the elastic force to the spool.

A plurality of through holes having different diameters are formed in the spool so as to be spaced apart from each other in the longitudinal direction of the spool, and the spool may be moved in the longitudinal direction so that at least one of the plurality of through holes is exposed to the oil flow path.

The control means may include an elastic body provided on one side in the longitudinal direction of the spool to continuously apply elastic force to the spool, and the plurality of through holes formed in the spool may increase in diameter toward the direction in which the elastic body applies the elastic force to the spool.

The through hole having the smallest diameter among the plurality of through holes may be exposed to the oil channel at the position where the spool is moved as much as possible in the direction in which the elastic body applies the elastic force to the spool.

According to the oil control valve of the present invention, by continuously supplying a small amount of lubricating oil to the clutch or bearing has the effect of preventing deterioration due to the continuous load to improve durability.

In addition, there is an effect that the problem that the amount of lubricating oil supply is insufficient because a deviation occurs in the small amount of lubricating oil supply according to product deviations such as O-ring and spring.

In addition, it has the effect of supplying a small amount of lubricating oil supply by changing only the shape of the spool inside the existing oil control valve.

1 is a cross-sectional view of a transfer case according to the prior art.
2 shows a perspective view of an oil control valve according to the prior art.
Figure 3 shows a perspective view of an oil control valve according to an embodiment of the present invention.
4 to 5 are cross-sectional views of a transfer case according to an embodiment of the present invention.
6 to 7 show a perspective view and a cross-sectional view of an oil control valve according to another embodiment of the present invention.

Specific structural to functional descriptions of the embodiments of the present invention disclosed in the specification or the application are only illustrated for the purpose of describing the embodiments according to the present invention, and the embodiments according to the present invention may be embodied in various forms. It should not be construed as limited to the embodiments described in this specification or the application.

Since the embodiments according to the present invention can be variously modified and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiments in accordance with the concept of the present invention to a particular disclosed form, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and / or second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another, for example, without departing from the scope of rights in accordance with the inventive concept, and the first component may be called a second component and similarly The second component may also be referred to as the first component.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It is to be understood that the present invention does not exclude, in advance, the possibility of addition, presence of steps, actions, 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. Terms such as those defined in the commonly used dictionaries should be construed as meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal sense unless clearly defined herein. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

Figure 3 shows a perspective view of an oil control valve according to an embodiment of the present invention, Figures 4 to 5 shows a cross-sectional view of the transfer case according to an embodiment of the present invention.

3 to 5, an oil control valve according to an embodiment of the present invention is positioned on an oil passage 100 connecting between a chamber (not shown) for storing oil and a lubrication component (not shown). A holder 200 having an inner space 210 formed in an outer direction of the flow path 100; A spool 300 having a shape extending in the longitudinal direction and moving in the longitudinal direction while being inserted into the inner space 210 and the oil passage 100 of the holder 200 to control the opening of the oil passage 100; And control means for controlling the movement of the spool 300 in the longitudinal direction of the spool 300 in the internal space 210 of the holder 200, wherein the spool 300 blocks the opening of the oil flow path 100. It is characterized in that a part of the oil passage 100 is opened even in the position.

Oil is applied to the friction-prone areas to reduce frictional resistance and prevent wear of parts. The oil passage 100 is connected to supply oil supplied from a chamber (not shown) for storing oil to a lubricating part (not shown).

The holder 200 is positioned on the oil passage 100 to form an inner space 210 in the outward direction of the oil passage 100. The inner space 210 is formed in an outer direction of the oil channel 100, and may be formed in a direction perpendicular to the oil channel 100, and may be formed side by side on both sides of the oil channel 100 as shown. It is preferable.

The spool 300 has a shape extending in the longitudinal direction and may have a cylindrical shape having a circular cross section extending in the longitudinal direction. The spool 300 is inserted into the inner space 210 and the oil flow path 100 of the holder 200 formed side by side on both sides of the oil flow path 100, and to be moved in the longitudinal direction (axial direction of the cylinder) therein. Can be.

A portion of the outer circumferential surface of the spool 300 is formed with an open surface having a groove or a hole formed therein, and as the spool 300 is moved in the longitudinal direction, the oil passage 100 according to a relative position between the open surface and the oil passage 100. The opening of can be controlled.

The spool 300 may open a part of the oil channel 100 even at a position to block the opening of the oil channel 100. As the spool 300 is moved so that the open surface of the spool 300 is not exposed to the oil passage 100, but is positioned in the internal space 210 of the holder 200, the spool 300 opens the oil passage 100. A part of the oil flow path 100 is to be opened even when moved to a position to block the.

Part of the oil passage 100 to be opened may be such that the minimum oil required for the lubrication component (not shown) can be supplied to the lubrication component (not shown).

Accordingly, even if the oil control valve is controlled to block the opening of the oil passage 100 by not operating the lubrication component (not shown), the lubrication component (not shown) may be supplied by supplying the minimum oil to the lubrication component (not shown). It has the effect of improving durability, and solves the problem that the variation of oil supply largely occurs according to the manufacturing variation of the parts included in the oil control valve at the moment of starting the lubrication parts (not shown). Have

The control means may control the movement of the spool 300 in the longitudinal direction of the spool 300 in the internal space 210 of the holder 200. That is, the control means controls the spool 300 to move in the longitudinal direction by applying a pulling force (human force) or pushing force (repulsive force) in the longitudinal direction of the spool 300 to the spool 300 of the oil flow path 100. Opening can be controlled.

Specifically, the control means may include an elastic body 600 provided on one side in the longitudinal direction of the spool 300 to continuously apply an elastic force to the spool 300. The elastic body 600 may be a spring 600.

In addition, a hydraulic device (not shown) provided on the other side in the longitudinal direction of the spool 300 to press the other side of the spool 300 may be provided. That is, the hydraulic pressure of the fluid supplied from the hydraulic device is located on the other side of the spool 300, the pressing force for pressing the other side of the spool 300 according to the hydraulic control of the hydraulic device can be varied.

In another embodiment, a solenoid may be used that applies an electromagnetic force while the power is supplied to control the spool 300 to intermittently attract or repulse, and does not generate the electromagnetic force when the power is cut off.

An insertion groove (not shown) is formed on the outer circumferential surface of the spool 300 in a direction perpendicular to the longitudinal direction of the spool 300, and the inner space 210 of the holder 200 is inserted into the insertion groove (not shown). O-ring 310 for preventing the leakage of the fluid is formed by the hydraulic device (not shown) on the other side of the spool 300 may be further included. O-ring 310 may be included in plurality.

Therefore, when the hydraulic device (not shown) provides an elastic force continuously applied to the spool 300 in the elastic body 600 and a pressing force greater than the sliding resistance (slip resistance) of the O-ring 310, the spool 300 is in the opposite direction of the elastic force. On the contrary, when the hydraulic device (not shown) is smaller than the force obtained by subtracting the sliding resistance of the O-ring 310 from the elastic force applied to the spool 300 by the elastic body 600, the spool 300 moves in the direction of the elastic force. do.

The lubrication part (not shown) may be a clutch or a bearing inside the transfer case.

The transfer case includes a clutch that repeatedly compresses and detaches to distribute torque to the front wheels and the rear wheels, and lubrication of the clutch is essential during torque distribution. Here, the clutch may be a multi-plate clutch.

That is, the oil control valve supplies oil for lubrication of the clutch or bearing by opening the oil passage 100 in which the transfer case is connected to the internal clutch or bearing in the 4WD mode, and in the 2WD mode, the oil connected to the internal clutch or bearing. The opening of the flow path 100 can be blocked.

Therefore, even in the state in which the spool 300 is moved to a position that blocks the opening of the oil passage 100 in the 2WD mode, a part of the oil passage 100 is opened to minimize the minimum slip required for lubrication of the bearing or micro slip of the clutch. The oil is supplied.

In addition, even in the low torque state in the 4WD mode, the oil flow path 100 is insufficient because the moving distance of the spool 300 according to the manufacturing deviation of the parts (O-ring 310, spring 600, etc.) included in the oil control valve. In case of lack of opening, minimal oil is supplied. That is, in the initial stage when the spool 300 starts to open the oil passage 100, the problem of lack of lubrication oil is solved according to the manufacturing deviation of the parts included in the oil control valve.

The spool 300 may have a first land 320 having a predetermined length in the longitudinal direction of the spool 300 and indented inward to have a relatively small outer diameter.

That is, in one embodiment of the open surface of the spool 300, the spool 300 is indented inward from the outer circumferential surface of the spool 300 and has a first land having an outer diameter relatively smaller than the outer diameter of the spool 300 at another position ( 320 may be formed. The first land 320 may be formed to have a predetermined length in the longitudinal direction of the spool 300.

The spool 300 may be moved between a first position where the first land 320 is exposed to the oil passage 100 as much as possible and a second position where all of the first land 320 is located outside the oil passage 100. have. Specifically, FIG. 4 illustrates a state in which the spool 300 is located in the first position, and FIG. 5 illustrates a state in which the spool 300 is located in the second position.

In particular, the length of the first land 320 in the longitudinal direction of the spool 300 may coincide with the inner diameter of the oil passage 100. Accordingly, the spool 300 opens the oil passage 100 at the first position where the first land 320 is exposed to the oil passage 100 as much as possible, and the oil passage 100 moves away from the first position. Can gradually block the opening.

When the spool 300 is in the second position, all of the first land 320, which is an open surface of the oil channel 100, is positioned outside the oil channel 100 so that the first land 320 is located in the oil channel 100. May not be exposed. According to the prior art, the oil flow path 100 is completely blocked in this state.

In the present invention, the spool 300 is configured to open a part of the oil flow path 100 even in a position of blocking the opening of the oil flow path 100, and the oil spool 300 is in the state where the spool 300 is in the second position. A second land 330 having a relatively small outer diameter may be formed by being indented into the outer circumferential surface of the exposed spool 300.

The second land 330 is less indented to have a relatively larger diameter than the first land 320, and preferably has a small length in the longitudinal direction of the spool 300. Since the state in which the second land 330 is exposed to the oil passage 100 is a state in which only the minimum oil is supplied, when the spool 300 is in the second position, the first land 320 is connected to the oil passage 100. It is desirable to ensure that a relatively small amount of oil is supplied than when the first exposed position is the maximum.

The second position may be a position where the spool 300 is maximally moved in the direction in which the elastic member 600 applies the elastic force to the spool 300. The elastic body 600 provided on one side of the spool 300 in the longitudinal direction continuously applies an elastic force to the spool 300, and when the other side pressing force of the spool 300 by the hydraulic device (not shown) is absent or weak, the spool ( 300) is in the second position moved as much as possible in the direction of the elastic force by the elastic force.

6 to 7 show a perspective view and a cross-sectional view of an oil control valve according to another embodiment of the present invention.

6 to 7, in the oil control valve according to another embodiment of the present invention, a plurality of through holes 340 having different diameters from the spool 300 are formed to be spaced apart in the longitudinal direction of the spool 300, The spool 300 may be moved in the longitudinal direction so that at least one of the plurality of through holes 340 is exposed to the oil passage 100.

That is, another embodiment of the open surface of the spool 300 is to form a through hole 340 in the spool 300. In the spool 300, a plurality of through holes 340 may be formed to be spaced apart in the longitudinal direction of the spool 300, and the plurality of through holes 340 may have different diameters. Accordingly, as the spool 300 moves in the longitudinal direction, the diameters of the through-holes 340 exposed to the oil passage 100 are different from each other, so that the amount of oil passing through the oil passage 100 may be controlled.

The through hole 340 exposed to the oil passage 100 may be one, but the spool 300 may be gradually increased to increase the oil passing through the oil passage 100 according to the distance moving in the longitudinal direction of the spool 300. It will be preferable that two through holes 340 continuous in the longitudinal direction of the cross-section are simultaneously exposed to the oil flow path 100.

The plurality of through holes 340 formed in the spool 300 may increase in diameter in a direction in which the elastic body 600 applies an elastic force to the spool 300. That is, the diameter of the through hole 340 formed in the spool 300 gradually increases as the elastic force of the elastic member 600 provided on one side in the longitudinal direction of the spool 300 increases, thereby increasing the size of the through hole 340. It can be formed large.

The diameter of the plurality of through holes 340 formed in the spool 300 and the separation distance between the through holes 340 are appropriately designed such that the opening amount of the oil passage 100 is gradually increased according to the movement distance of the spool 300. It is desirable to be.

Accordingly, as the spool 300 moves in the opposite direction of the elastic force by the hydraulic pressure supplied from the hydraulic device (not shown), the size of the through hole 340 exposed to the oil channel 100 gradually increases, thereby increasing the oil channel. The amount of oil passing through 100 may be gradually increased.

The through hole 340 having the smallest diameter among the plurality of through holes 340 is exposed to the oil flow path 100 at a position where the spool 300 is moved as much as possible in the direction in which the elastic body 600 applies the elastic force to the spool 300. Can be. That is, when there is no or weak hydraulic pressure by the hydraulic device (not shown), when the spool 300 is moved to the maximum direction in the elastic force direction by the elastic force, the through hole 340 having the smallest diameter is the oil passage 100 Will be exposed to.

That is, the diameter of the through hole 340 formed in the spool 300 gradually increases as the elastic force of the elastic body 600 is applied, and the spool in the direction in which the elastic body 600 applies the elastic force to the spool 300. In the position where the 300 is moved to the maximum, the through hole 340 having the smallest diameter is exposed to the oil channel 100 to pass only the minimum oil.

While shown and described in connection with specific embodiments of the present invention, it is within the skill of the art that various changes and modifications can be made therein without departing from the spirit of the invention provided by the following claims. It will be self-evident for those of ordinary knowledge.

100: oil euro 200: holder
210: internal space 300: spool
400: clutch 500: bearing
600: elastic body (spring)

Claims (8)

A holder positioned on the oil passage connecting the lubrication parts and the chamber for storing the oil, the holder having an inner space in an outward direction of the oil passage;
A spool having a shape extending in the longitudinal direction and moving in the longitudinal direction while being inserted into the inner space of the holder and the oil flow path to control the opening of the oil flow path; And
Includes; control means for controlling the movement of the spool in the longitudinal direction of the spool in the inner space of the holder,
And a plurality of through holes having different diameters spaced apart from each other in the longitudinal direction of the spool, and the spool is moved in the longitudinal direction such that at least one of the plurality of through holes is exposed to the oil flow path. The method according to claim 1,
The lubricating part is an oil control valve, characterized in that the clutch or bearing in the transfer case. delete delete delete delete The method according to claim 1,
The control means includes an elastic body provided on one side in the longitudinal direction of the spool to continuously apply an elastic force to the spool,
The plurality of through holes formed in the spool has an oil control valve, characterized in that the diameter increases as the elastic body exerts an elastic force on the spool. The method according to claim 7,
An oil control valve, characterized in that the through hole having the smallest diameter among the plurality of through holes is exposed to the oil flow path in the position where the elastic body exerts elastic force on the spool.

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