KR20200126883A - Oil bypass valve - Google Patents

Abstract

The present invention provides an oil bypass valve installed between a transmission or an engine and an oil cooler cooling an oil, which comprises: a body having a hollow space therein while including a first port through which the oil is introduced from the transmission or the engine, a second port through which oil is discharged to the transmission or the engine, a third port through which the oil is discharged from the oil cooler, and a fourth port through which the oil is introduced from the oil cooler; and an opening and closing member slidingly moving in the hollow space according to the temperature of the oil in the transmission or the engine to selectively open and close a flow path within the body, wherein the opening and closing member, if the temperature of the oil in the transmission or the engine rises to arrive at an actuation temperature band, allows the outer surface to come into contact with the inner surface of the hollow space such that a portion of the oil introduced through the first port is discharged to the third port, and the opening and closing member, if the temperature of the oil in the transmission or the engine additionally rises over the actuation temperature band, slidingly moves additionally to a predetermined distance in a state that the outer surface is in contact with the inner surface of the hollow space. According to the present invention, it is possible to prevent a failure which may occur by overexpansion of metal or wax due to overheating of a transmission or engine oil.

Description

Oil Bypass Valve {OIL BYPASS VALVE}

The present invention is installed between a transmission or engine and an oil cooler that cools oil, and bypasses the transmission or engine according to the oil temperature of the transmission or engine to prevent a decrease in the oil temperature of the transmission or engine, or flow into the oil cooler. It relates to an oil bypass valve for cooling the oil and supplying the cooled oil to a transmission or engine.

The inside of the vehicle's transmission or engine is filled with oil for shifting or rotational motion.

When the temperature of transmission or engine oil is low, the viscosity increases and friction loss increases, which hinders the fuel economy of the vehicle and promotes the wear of parts.On the contrary, when the temperature is high, the oil is scattered and the durability decreases. A valve that can be controlled depending on the temperature is applied between the transmission or engine and a cooling device for cooling oil.

1 is a connection diagram of a transmission or engine, an oil bypass valve, and an oil cooler.

As shown in FIG. 1, in order to maintain the oil temperature of the transmission or engine 1 at an appropriate level, an empty or water-cooled oil cooler 2 may be used. At this time, an oil bypass valve 3 for controlling the amount of oil circulating between the transmission or engine 1 and the oil cooler 2 is installed on the flow path connecting the transmission or engine 1 with the oil cooler 2. I can.

The oil bypass valve 3 allows oil to be bypassed inside the oil bypass valve 3 and flow into the transmission or engine 1 when the temperature of the oil filled in the transmission or engine 1 is low (Fig. 1(b)), on the contrary, when the oil temperature is high, the oil passes through the oil bypass valve 3 to circulate the transmission or engine 1 and the oil cooler 2 (see FIG. 1(a)). To cool the oil.

When the temperature of the oil is within a certain temperature range, the oil bypass valve (3) allows a part of the oil discharged from the transmission or engine (1) to be bypassed to the transmission or engine (1), and the rest to the oil cooler (2). Make it cycle. At this time, at a low temperature within the specific temperature range, the amount of oil returned from the oil bypass valve 3 to the transmission or engine 1 is less than the amount circulated to the oil cooler 2, and is higher within the specific temperature range. In temperature, the amount of oil returned from the oil bypass valve 3 to the transmission or engine 1 is greater than the amount circulated to the oil cooler 2.

Typically, the operating temperature of the oil bypass valve 3 is 70 to 85° C., and the piston slides in the vertical direction by wax (or metal) that is accommodated in the piston and expands in volume depending on the temperature.

At this time, the stroke length of the piston is 4.5mm, but when the temperature of the oil exceeds 85°C, the wax expands excessively and the oil bypass valve 3 may fail.

Therefore, it is necessary to present a technology to solve this problem.

KR 10-1744812 B1 KR 10-1619649 B1

An object of the present invention is to provide an oil bypass valve capable of preventing a failure that may occur due to excessive expansion of metal or wax due to overheating of a transmission or engine oil.

In order to solve the above problems, the present invention, in the oil bypass valve installed between the transmission or engine and the oil cooler to cool the oil, the internal hollow portion is formed, the oil is introduced from the transmission or engine side A body having a port, a second port for discharging oil to the transmission or engine side, a third port for discharging oil from the oil cooler side, and a fourth port through which oil flows from the oil cooler, and the hollow part And an opening/closing member for selectively opening and closing the flow path in the body by sliding according to the temperature of the transmission or engine-side oil, wherein the opening/closing member is, when the temperature of the transmission or engine-side oil rises and reaches an operating temperature range , A portion of the oil introduced through the first port is discharged to the third port by an outer surface interviewing the inner surface of the hollow part, and the opening/closing member has a temperature of the transmission or engine side oil within the operating temperature range. When the additional rise exceeds, it provides an oil bypass valve, characterized in that the outer surface is further slid by a predetermined distance in the state of being interviewed along the inner surface of the hollow portion.

According to an embodiment, the opening and closing member includes a piston including a deformable member that expands or contracts according to the temperature of the transmission or engine side oil, and a valve body coupled to an upper outer circumference of the piston and having a predetermined thickness. However, the inner surface of the hollow part may have a second stepped part facing the outer surface of the valve body and a first stepped part facing the bottom surface of the valve body when the piston is at the bottom dead center.

According to an embodiment, the opening/closing member further comprises an elastic means coupled to a lower outer circumferential surface of the piston, and the elastic means supports the valve body so that when the deformable member is contracted, the valve body is When the deformable member is expanded, the valve body may be lowered and compressed.

According to an embodiment, the opening and closing member further includes a shaft inserted into the piston and having an upper end supported by the valve cap, and when the deformable member expands, the shaft is pushed outward to downwardly slide the piston, and the When the deformable member is contracted, the piston can be moved up and down by the restoring force of the elastic means.

According to an embodiment, the valve cap may further include an adjustment knob for controlling the position of the top dead center of the shaft by elevating and descending according to adjustment at a position corresponding to the shaft.

According to an embodiment, the second stepped portion is formed only on the first and second port sides, and not formed on the third and fourth ports, so that the body longitudinal section may be asymmetric.

According to an embodiment, the maximum stroke length of the opening and closing member may be 8 mm, and a step difference between the first stepped portion and the second stepped portion may be at least 3.5 mm.

According to an exemplary embodiment, a segment may be further included to be mounted on the second stepped portion to adjust a step difference between the first and second stepped portions.

According to an embodiment, the opening/closing member may include some of the oil introduced through the first port discharged through the second port when a temperature of the transmission or engine side oil is lower than the operating temperature range, The remaining part may be discharged through the third port.

The oil bypass valve according to the present invention has an effect of preventing a failure that may occur due to excessive expansion of metal or wax due to overheating of a transmission or engine oil.

In addition, according to the present invention, by adjusting the step difference between the first and second stepped portions, there is an effect of controlling the timing at which oil of the transmission or engine is sent to the oil cooler.

In addition, according to an embodiment of the present invention, there is an initial failure in the oil bypass valve, so that the valve may not operate despite an increase in the oil temperature on the transmission or engine, and even so, some oil is discharged to the oil cooler. This prevents the oil temperature from overheating.

1 is a connection diagram of a transmission or engine, an oil bypass valve, and an oil cooler.
2 is an exploded perspective view of an oil bypass valve according to an embodiment of the present invention.
3 and 4 are longitudinal sectional views of an oil bypass valve according to an embodiment of the present invention.
5 is a view showing an operating state of an oil bypass valve according to an embodiment of the present invention when an oil temperature of a transmission or engine is low.
6 is a view showing an operating state of an oil bypass valve according to an embodiment of the present invention when the oil temperature of a transmission or engine is high.
7 is a longitudinal sectional view of an oil bypass valve according to another embodiment of the present invention.
8A and 8B are longitudinal sectional views of an oil bypass valve showing an initial position of a valve body according to another embodiment of the present invention.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but identical or similar elements are denoted by the same reference numerals regardless of reference numerals, and redundant descriptions thereof will be omitted. The suffixes "unit" and "unit" for constituent elements used in the following description are given or used interchangeably in consideration of only the ease of preparation of the specification, and do not themselves have a distinct meaning or role. In addition, in describing the embodiments disclosed in the present specification, if it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all modifications included in the spirit and scope of the present invention It should be understood to include equivalents or substitutes.

Terms including ordinal numbers, such as first and second, may be used to describe various elements, but the elements are not limited by the terms.

These terms are used only for the purpose of distinguishing one component from another component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present specification, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

2 is an exploded perspective view of an oil bypass valve according to an embodiment of the present invention, and FIGS. 3 and 4 are longitudinal sectional views of the oil bypass valve according to an embodiment of the present invention.

As shown in Figures 2 to 4, the oil bypass valve 100 according to an embodiment of the present invention, the internal hollow portion is formed, the first port 111 through which oil is introduced from the transmission or engine (1) side. ), a second port 112 for discharging oil to the transmission or engine 1, a third port 113 for discharging oil from the oil cooler 2, and oil from the oil cooler 2 The body 110 having the inflowing fourth port 114 and an opening and closing member that selectively opens and closes the flow path in the body 110 by sliding and moving according to the temperature of the oil on the transmission or engine 1 in the hollow part ( 130-150) may be included.

When the temperature of the oil on the transmission or engine 1 side rises and reaches the operating temperature range, the opening/closing members 130 to 150 are introduced through the first port 111 by making an interview with the inner surface of the hollow part. Part of the oil is discharged to the third port 113, and if the temperature of the transmission or engine 1 side oil further increases beyond the operating temperature range, the outer surface is interviewed along the inner surface of the hollow part By sliding an additional distance by a predetermined distance, failure that may occur due to excessive expansion of the deformable member due to overheating of the transmission or engine oil can be prevented in advance.

However, since the components shown in FIGS. 2 to 4 are not essential, an oil bypass valve having more components or fewer components may be implemented.

Hereinafter, each component will be described.

The body 110 has a hollow portion as an accommodation space for accommodating the opening and closing members 130 to 150 for the opening and closing operation of the valve, and an insertion hole 115 is formed on one side thereof to accommodate the opening and closing members 130 to 150. It may be opened to be attached to or detached from the hollow part.

The body 110 may have first and second ports 111 and 112 through which oil flows in/out from the transmission or engine 1 and to the transmission or engine 1, and from the oil cooler 2 and The oil cooler 2 may have third and fourth ports 113 and 114 through which oil flows in/out. It can be divided into a pair of first and second ports 111 and 112 and another pair of third and fourth ports 113 and 114 based on the position of the hollow part or the opening and closing member 130 to 150 And each pair is connected to a transmission or engine 1 or oil cooler 2 so that at least a part of the oil discharged from the transmission or engine 1 is bypassed to the transmission or engine 1, or the transmission or At least part of the oil discharged from the engine 1 may be circulated to the oil cooler 2.

At this time, one end of the nipples 121 to 124 is coupled to each of the first to fourth ports 111 to 114, and a transmission or engine 1 or an oil cooler 2 is coupled to the other end of the nipples 121 to 124. Thus, it is possible to form a flow path for the transmission or engine 1, the oil bypass valve 3, and the oil cooler 2. Reference numerals 121a to 124a are nipple O-rings, which are interposed between the nipples 121 to 124 and the ports 111 to 114 to fill the gap between the nipples 121 to 124 and the ports 111 to 114 to prevent oil leakage. Can be prevented.

The hollow portion of the body 110 may include an opening/closing member 130 to 150 for selectively opening and closing a flow path in the body 110 by sliding according to the temperature of the oil on the transmission or engine 1 side.

The hollow portion of the body 110 is formed to communicate with the first to fourth ports 111 to 114 and the insertion hole 115, the opening and closing members 130 to 150 are the second and fourth ports 112, 114 The piston 130 and the valve body 140 coupled thereto by being mounted on the branching point are raised and lowered, thereby opening or closing the bypass flow path. The opening/closing members 130 to 150 may be mounted or detached to the hollow portion through an insertion hole 115 opened at one side of the body 110, and the insertion hole 115 is fastened to the valve cap 160 It becomes and can be closed.

Accordingly, the opening/closing members 130 to 150 open the bypass flow path to bypass the oil introduced from the transmission or engine 1 and discharge the oil to the transmission or engine 1 again, or close the bypass flow path to Oil introduced from the engine 1 side can be transferred to the oil cooler 2 side. Of course, the opening/closing members 130 to 150 open (or close) a part of the bypass flow path to bypass a part of the oil introduced from the transmission or engine 1 side, and discharge the oil to the transmission or engine 1 again, and the remaining part Can be transferred to the oil cooler (2) side.

Specifically, the opening and closing members 130 to 150 include a piston 130 including a deformable member 132 that expands or contracts according to the temperature of the transmission or engine 1 side oil, and the upper outer peripheral surface of the piston 130 It may include a valve body 140 having a predetermined thickness coupled to.

The deformable member 132 is a wax or metal that expands or contracts depending on temperature, and the temperature of the oil that contacts the piston 130, that is, the oil introduced through the first port 111 from the transmission or engine 1 The shaft 131 inserted in one side is pushed out by expanding according to the oil temperature, or the shaft 131 drawn out by the restoring force of the elastic means 150 may be drawn into the deformable member 132 by contracting according to the temperature of the oil.

The shaft 131 is inserted and installed in the piston 130 and the deformable member 132, and the upper end is supported by the valve cap 160 to prevent the shaft 131 from moving up and down due to the expansion of the deformable member 132. It is possible to induce the downward movement of the piston 130 by the opposite action. On the contrary, when the deformable member 132 is contracted, the piston 130 moves up and down by the restoring force of the elastic means 150.

The valve body 140 having a predetermined thickness is coupled to the upper outer circumferential surface of the piston 130, and each time the piston 130 is raised or lowered, the valve body 140 is interviewed or spaced apart from the inner surface of the hollow inside the body 110. , The bypass flow path can be opened and closed.

The inner surface of the hollow portion inside the body 110 according to an embodiment of the present invention may have first and second stepped portions S1 and S2, as shown in FIG. 3 and the like. The first and second stepped portions S1 and S2 may be formed along the inner circumferential surface of the hollow portion, but are preferably formed only on the first and second ports 111 and 112 and the third and fourth ports 113 and 114 Since it is not formed on the) side, the longitudinal section of the body 110 may be asymmetrical with different left and right.

In this way, the longitudinal section of the body 110 is asymmetrical with different left and right, and when the oil of the transmission or engine is at a low temperature, the oil cooler prevents the oil from flowing into the body 110, so that the deformable member 132 having sensitivity to temperature ), the oil flowing from the oil cooler is not in contact, so that the operating temperature range of the temperature-sensitive bypass valve can be accurately operated according to the user's intention.

The first and second stepped portions S1 and S2 are formed to have a step difference by a predetermined length d, and when the piston 130 is at the bottom dead point, the valve body 140 having a predetermined thickness is It comes into contact with both the first and second stepped portions S1 and S2. That is, when the piston 130 is at the bottom dead point, the bottom surface of the valve body 140 is in contact with the first stepped portion S1, and the outer surface of the valve body 140 is the second stepped portion. You come into contact with (S2).

Eventually, when the oil temperature of the transmission or engine 1 reaches the operating temperature range, the expansion of the deformable member 132 pushes the shaft 131 outward, so that the piston 130 descends in the opposite action, and the valve body 140 The outer surface of) first contacts the second stepped part S2 to block the bypass flow path.

Thereafter, when the oil temperature on the transmission or engine 1 side exceeds the operating temperature range and further increases, the outer surface of the valve body 140 slides by a predetermined distance (d) while interfacing with the inner surface of the hollow part. , The bypass flow path remains blocked.

Here, the operating temperature band is usually 70 to 85°C, and at 85°C, the upper limit of the operating temperature band, the lower end of the valve body 140 descends to the upper surface of the second stepped portion S2 to start blocking the bypass flow path. do. When the piston 130 is at the top dead center, the height from the height of the lower surface of the valve body 140 to the upper surface of the second stepped portion S2 is approximately 4.5 mm, and the oil temperature of the transmission or engine 1 When it reaches 85° C., the piston 130 can move 4.5mm.

Thereafter, if the temperature exceeds the upper limit of the operating temperature range of 85°C, the piston 130 moves downward while continuing to block the bypass flow path, unlike the prior art, but the maximum stroke length of the piston is usually 8 mm. In consideration of, it is preferable that the step difference between the first stepped portion S1 and the second stepped portion S2 is at least 3.5mm so that an additional minimum of 3.5mm can be moved.

Meanwhile, the opening/closing members 130 to 150 according to an embodiment of the present invention may further include an elastic means 150 coupled to the lower outer circumferential surface of the piston 130.

The elastic means 150 supports the valve body 140 coupled to the upper portion of the piston 130, and when the deformable member 132 is contracted, the valve body 140 and the piston 130 are raised by a restoring force, and vice versa. When the member 132 is expanded, the valve body 140 and the piston 130 are compressed and lowered to store energy.

That is, the piston 130 and the valve body 140 are raised and lowered by the interaction of the deformable member 132 and the elastic means 150, and thus the bypass flow path according to whether an interview between the valve body 140 and the inner peripheral surface of the hollow part Will open and close.

The operation process of the oil bypass valve 100 according to an embodiment of the present invention will be described as follows.

5 is a view showing an operating state of an oil bypass valve according to an embodiment of the present invention when the oil temperature of a transmission or engine is low, and FIG. 6 is an embodiment of the present invention when the oil temperature of a transmission or engine is high. It is a view showing the operating state of the oil bypass valve according to.

As an example, assuming that the operating temperature band of the oil bypass valve 100 is 70 to 85°C, when the temperature of the oil is less than 70°C, the valve body 140 by the elastic means 150 is formed at the upper valve cap ( In contact with the 160), the oil flowing through the first nipple 121 and the first port 111 passes through the second port 112 and the second nipple 122 through the bypass flow path to the transmission or engine 1 Is bypassed to the side (see Fig. 5).

When the temperature of the oil is higher than 70° C., the deforming member 132 expands and pushes the shaft 131 upward and simultaneously lowers the valve body 140, so that the first nipple 121 and the first port ( Part of the oil introduced through 111 is bypassed to the transmission or engine 1 through the second port 112 and the second nipple 122 through the bypass flow path, and the remaining part is the third port 113 And the oil discharged to the oil cooler 2 through the third nipple 123 and circulated through the oil cooler 2 to be supplied to the transmission or engine 1 side.

When the temperature of the oil further increases and reaches 85° C., the deforming member 132 further pushes the expansion shaft 131 upward and lowers the valve body 140 further, thereby blocking the bypass flow path. 1 The oil flowing through the nipple 121 and the first port 111 is discharged to the oil cooler 2 through the third port 113 and the third nipple 123, and circulates through the oil cooler 2. Cooled oil is supplied to the transmission or engine 1 (see Fig. 6).

Meanwhile, FIG. 7 is a longitudinal cross-sectional view of an oil bypass valve according to another embodiment of the present invention.

According to another embodiment of the present invention, the valve cap 160 includes an adjustment knob 161 capable of controlling the position of the top dead center of the shaft 131 by elevating and descending according to adjustment at a position corresponding to the shaft 131. Can include.

For example, a thread is formed on the outer circumferential surface of the adjustment knob 161, and a corresponding thread is formed on the inner circumferential surface of the through hole of the valve cap 16 into which the adjustment knob 161 is inserted, so that the adjustment knob 161 is rotated. You can go up and down according to.

Accordingly, the height of the valve cap 161 facing the upper end of the shaft 131 is adjusted, so that when the adjustment knob 161 is adjusted upward, the deformable member 132 expands and the adjustment knob when the shaft 131 rises. Since the valve body 140 descends and slides at a higher temperature since the 161 can rise by the adjusted distance, the bypass flow path can be blocked only when the oil temperature is higher as the adjustment knob 161 is adjusted. have. On the contrary, when the adjustment knob 161 is adjusted downward, the deformable member 132 expands and the valve body 140 at a lower temperature even if the adjustment knob 161 does not rise further by the adjusted distance when the shaft 131 rises. ) Moves downward, so even if the oil temperature is not as high as the adjustment knob 161 is adjusted, the bypass flow path may be blocked.

Of course, the O-ring is coupled to the outer peripheral surface of the adjustment knob 161 to block oil leakage.

In addition, according to another embodiment of the present invention, further comprising a segment (C1, C2) for adjusting the step difference between the first and second stepped portions (S1, S2) is seated on the first stepped portion (S1). I can.

By adjusting the height of the second stepped portion S2 by the addition or subtraction of the segments C1 and C2, the upper limit of the operating temperature band of the oil bypass valve 100 according to an embodiment of the present invention can be lowered or raised. For example, when the operating temperature band is 70 to 85°C, the oil temperature at the time when the bypass flow path is blocked may increase or decrease 85°C.

When the height of the second stepped portion S2 is increased due to the addition of the segments C1 and C2, the bypass flow path is blocked even if the descending distance of the valve body 140 is short, and the segments C1 and C2 are removed, and the second This is because when the height of the stepped portion S2 is lowered, the bypass flow path is blocked only when the descending distance of the valve body 140 is slightly longer.

Meanwhile, FIGS. 8A and 8B are longitudinal cross-sectional views of an oil bypass valve showing an initial positional state of a valve body according to another embodiment of the present invention.

The oil bypass valve 100 shown in FIGS. 8A and 8B shows an initial positional state of the valve body at a low temperature when the oil temperature of the transmission or engine 1 side does not reach the operating temperature range. That is, even if the valve body 140 is pressed upward by the elastic means 150 when the temperature of the oil on the transmission or engine 1 side does not reach the operating temperature range, the opening and closing members 130 to 150 Some of the oil flowing through the nipple 121 and the first port 111 is bypassed to the transmission or engine 1 through the second port 112 and the second nipple 122 through the bypass flow path, Another part may be discharged toward the oil cooler 2 through the third port 113 and the third nipple 123.

To this end, a spacer 170 may be further included on an inner bottom surface of the valve cap 160, an upper surface of the valve body 140, or an upper outer circumferential surface of the shaft 131 according to an embodiment of the present invention. Can (see Fig. 8a).

The spacer 170 may be interposed between the inner bottom surface of the valve cap 160 and the upper surface of the valve body 140 to limit the top dead center of the piston 130, and accordingly, the first nipple 121 and Some of the oil introduced through the first port 111 is discharged to the oil cooler 2 side through the third port 113 and the third nipple 123 through the gap generated by the spacer 170, and the F2 flow path And the other part is through the gap between the outer surface of the valve body 140 and the inner surface of the hollow portion inside the body 110 through the second port 112 and the second nipple 122 through a transmission or engine ( It can be bypassed to the 1) side to form the F1 flow path.

The oil bypass valve 100 has an initial failure, so the valve may not operate despite an increase in the oil temperature of the transmission or engine 1, even though some oil flows to the oil cooler 2 along the F2 flow path. It can be drained to prevent the oil temperature from overheating.

Alternatively, according to an embodiment of the present invention, the piston 130 or the valve body 140 may include an inlet hole 141 formed on one side and an outlet hole 142 formed on the other side, The inlet hole and the outlet hole may communicate with each other (see FIG. 8B). Here, the inlet hole 141 and the outlet hole 142 may be at least one, and a hole through which the oil introduced through the first port 111 flows into the piston 130 or the valve body 140 is an inlet hole ( 141), and the hole through which the oil introduced through the inlet hole 141 flows out is only referred to as the outlet hole 142, and specific holes are not limited to the inlet hole 141 and the outlet hole 142.

The oil introduced from the inlet hole 141 may be discharged to the outlet hole 142, and some of the oil introduced through the first nipple 121 and the first port 111 may be the inlet hole 141 And it is discharged to the oil cooler 2 side through the third port 113 and the third nipple 123 through the outlet hole 142 to form an F3 flow path, and another part of the valve body 140 and the outer surface The body 110 may be bypassed to the transmission or engine 1 through the second port 112 and the second nipple 122 through a gap between the inner surface of the hollow portion inside the body 110 to form the F1 flow path.

Likewise, there is an initial failure in the oil bypass valve 100, so the valve may not operate despite an increase in the oil temperature of the transmission or engine 1, even though some oil flows along the flow path F3 to the oil cooler 2 ) To prevent the oil temperature from overheating.

In the above, preferred embodiments of the present invention have been described in detail with reference to the drawings. The description of the present invention is for illustrative purposes only, and a person of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning, scope, and equivalent concepts of the claims are included in the scope of the present invention. Must be interpreted.

1: Transmission or engine 2: Oil cooler
3: oil bypass valve 100: oil bypass valve
110: body 111: first port
112: second port 113: third port
114: fourth port 115: insertion hole
121: first nipple 122: second nipple
123: 3rd nipple 124: 4th nipple
121a, 122a, 123a, 124a: nipple O-ring 130: piston
131: shaft 132: deformable member
140: valve body 141: inlet hole
142: outlet hole 150: elastic means
160: valve cap 161: adjustment knob
170: spacer C1, C2: segment
S1: first stepped portion S2: second stepped portion

Claims (5)

In the oil bypass valve installed between a transmission or engine and an oil cooler that cools oil,
An internal hollow portion is formed, a first port through which oil flows from the transmission or engine side, a second port through which oil is discharged to the transmission or engine side, a third port through which oil is discharged from the oil cooler side, and the oil A body having a fourth port through which oil flows from the cooler; And
An opening/closing member for selectively opening and closing the flow path in the body by sliding in the hollow part according to the temperature of the transmission or engine-side oil;
Including,
The opening and closing member includes a piston including a deforming member that expands or contracts according to the temperature of the transmission or engine-side oil, and a valve body coupled to an upper outer circumferential surface of the piston and having a predetermined thickness,
The inner surface of the hollow part has a first stepped part facing the bottom surface of the valve body when the piston is at the bottom dead center, and a second stepped part facing the outer surface of the valve body, and the second stepped part It is formed only on the side of the first and second ports, and is not formed on the side of the third and fourth ports, so that the longitudinal section of the body is asymmetrical,
When the temperature of the transmission or engine-side oil rises and reaches the operating temperature range, the valve body descends and the outer surface begins to contact the second stepped portion, and flows through the first port until the valve body rises. The oil is discharged to the third port, wherein the inner surface of the hollow portion between the first stepped portion and the second stepped portion interviews the outer peripheral surface of the valve body,
When the temperature of the transmission or engine-side oil further rises beyond the operating temperature range due to overheating, the valve body is in a state in which the outer circumferential surface is in an interview with the inner surface of the hollow portion between the first stepped portion and the second stepped portion. To prevent failure due to excessive expansion of the deformable member in advance by maintaining it and allowing it to be further lowered by a predetermined distance,
The oil bypass valve, characterized in that when the bottom surface of the valve body reaches the first stepped portion, the first stepped portion prevents the lowering of the valve body. The method of claim 1,
The opening and closing member further comprises an elastic means coupled to the lower outer peripheral surface of the piston,
Wherein the elastic means supports the valve body to raise the valve body by a restoring force when the deformable member is contracted, and when the deformable member is expanded, the valve body is lowered and compressed. The method of claim 2,
The opening and closing member may include a shaft inserted into the piston and having an upper end supported by the valve cap;
Further include,
When the deformable member is expanded, the shaft is pushed outward to slide the piston downward, and when the deformable member is contracted, the piston is lifted and slided by a restoring force of the elastic means. The method of claim 3,
The valve cap may include an adjustment knob for controlling a position of a top dead center of the shaft by elevating and descending according to adjustment at a position corresponding to the shaft;
Oil bypass valve, characterized in that it further comprises. The method of claim 1,
The opening and closing member,
When the temperature of the transmission or engine side oil is lower than the operating temperature range, some of the oil introduced through the first port is discharged through the second port, and the remaining part is discharged through the third port. Oil bypass valve, characterized in that.

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