JP2012251430A - Oil supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil supply device that can surely and quickly supply oil at engine start.SOLUTION: The oil supply device 1 includes: an oil pan 11 formed on a bottom part of an engine 2; an oil pump 15 for pumping oil stored in the oil pan 11; an oil supply path 13 for connecting the oil pan 11 and the oil pump 15; and a check valve 14 arranged in the oil supply path 13, which maintains an opened state when a state is a static pressure state without the oil and a normal flow state where the oil flows from the oil pan 11 to the direction of the oil pump 15 and switches to a closed state when the state is changed to a backflow state where the oil flows from the oil pump 15 to the direction of the oil pan 11.

Description

  The present invention relates to an oil supply apparatus that pumps oil stored in an oil pan by an oil pump and supplies the oil to various parts of an engine.

  As such an oil supply device, Patent Document 1 describes an oil strainer provided with a check valve that stops the flow of lubricating oil from an oil pump through an oil strainer to an oil pan when the engine is stopped. ing. While the engine is stopped, the check valve keeps the lubricating oil stored in the oil passage, so that the lubricating oil is immediately supplied to the engine's lubrication part when the engine is started. It can be prevented.

  The oil supply device described in Patent Document 2 has an opening / closing plate that prevents backflow of the lubricating oil and has a protrusion formed on the lower surface at the suction port of the oil strainer. When the opening / closing plate is closed, the protrusion penetrates the hole of the filter of the oil strainer, and the filter is cleaned. Therefore, according to this oil supply device, it is possible to simultaneously prevent the backflow of the lubricating oil and the reduction of the suction efficiency due to the clogging of the filter, and to smoothly supply the lubricating oil when starting the engine.

JP 2004-293376 A Japanese Patent Laid-Open No. 7-247819

  In recent years, development of hybrid vehicles including an engine and an electric motor as a power source, and vehicles including an idling stop mechanism that automatically stops the engine when the vehicle stops due to a signal or the like has progressed. In these vehicles, the engine stop and restart may be frequently repeated depending on the driving situation. In such a case, since the operation needs to be smoothly continued or restarted after the engine is restarted, not only the oil as the lubricating oil is supplied quickly, but also the hydraulic pressure such as a valve opening / closing timing control device that is hydraulically operated. It is necessary to quickly supply oil as hydraulic oil to the actuator.

  However, according to the oil supply device described in Patent Document 1 and Patent Document 2, even when the check valve or the opening / closing plate is in the open state, the oil is compared between the inner wall of the oil strainer and the valve body. Since it is necessary to circulate through a narrow space, the flow resistance against the oil flow is large. In addition, since the oil flow direction changes in the portion where the check valve or the opening / closing plate is provided, there is a possibility that smooth oil circulation may be hindered. Furthermore, since the check valve or the opening / closing plate is provided in the portion where the flow passage area is narrowed from the oil strainer to the oil passage, there are many factors that cause fluctuations in the flow passage area and there is a possibility that stable hydraulic pressure cannot be supplied.

  Further, the check valve of Patent Document 1 or the opening / closing plate of Patent Document 2 is configured to maintain the valve closed state by a biasing means or its own weight in a static pressure state where no oil flows. For this reason, switching the check valve or opening / closing plate to the open state when starting the engine requires extra work to switch to the open state against the load caused by the biasing means or its own weight. Is not performed smoothly, and there is a risk of impeding rapid oil supply.

  In view of the above problems, an object of the present invention is to provide an oil supply device that can reliably and quickly supply oil when the engine is started.

  The characteristic configuration of the oil supply device according to the present invention includes an oil pan formed at the bottom of the engine, an oil pump that pumps up oil stored in the oil pan, and a supply oil that connects the oil pan and the oil pump. And in the static pressure state in which no oil flows and the forward flow state in which oil flows in the direction from the oil pan to the oil pump, the valve opening state is maintained and the oil is supplied to the oil pump. And a check valve that switches to a closed state when it changes to a backflow state that flows in the direction from the oil pan to the oil pan.

  According to this feature configuration, a check valve is provided in the supply oil passage between the oil pan and the oil pump, so that the oil that flows back to the oil pan can remain in the supply oil passage when the engine is stopped. It becomes. Therefore, when the engine is started, the oil remaining in the supply oil passage is pumped up by the oil pump, so that quick oil supply is possible. Such an effect becomes greater particularly when the supply oil path between the oil pan and the oil pump must be lengthened due to the structure of the vehicle.

  Further, according to the present feature configuration, the check valve is configured to maintain the valve open state in the static pressure state without oil flow, so that the valve closed state is maintained in the static pressure state. Compared with the case where it exists, switching from a valve closing state to a valve opening state is implement | achieved efficiently and rapidly. Therefore, it is possible to reliably supply oil more quickly when the engine is started. With such an oil supply device, even in a hybrid vehicle where the engine is frequently stopped and restarted, a vehicle equipped with an idling stop mechanism, etc., oil is quickly supplied to a hydraulic actuator such as a valve opening / closing timing control device that is hydraulically operated. Therefore, the operation can be smoothly continued or resumed.

  Here, the valve body of the check valve is pivotally supported by a pivot shaft provided in the supply oil passage so as to be able to swing, so that the valve body extends along the inner wall surface of the supply oil passage in the opened state. It is preferable to be configured as follows.

  If the valve body of the check valve is cantilevered as in this feature configuration and is configured to follow the inner wall surface of the supply oil passage in the open state, the supply oil passage is generally in the open state. It is in a fully open state. Therefore, in the valve open state, the presence of the check valve is prevented from obstructing the oil flow, and the oil can be supplied smoothly.

  Furthermore, it is preferable that a pressure receiving portion that receives a force toward the valve-closed state by the oil in the backflow state is provided at an end portion of the valve body opposite to the side where the cantilever shaft is supported. .

  The valve body of the check valve swings around the rotating shaft according to the moment multiplied by the force that oil acts on the valve body in the backflow state and the distance between this operating position and the rotating shaft. The valve is closed. Therefore, as in this feature configuration, when a pressure receiving portion that receives a force toward the valve closed state by the oil in the backflow state is formed on the end portion of the valve body opposite to the cantilevered side. Since the distance between the pressure receiving portion and the rotating shaft is increased, the moment acting on the valve body can be increased. As a result, when the oil flow changes to the backflow state, the valve closing state can be quickly realized, and more oil can be left in the supply oil passage.

  Further, it is preferable that the check valve is disposed in a horizontal portion or an inclined portion of the supply oil passage, and the rotation shaft is provided on a bottom surface of the supply oil passage.

  According to this characteristic configuration, the valve body of the check valve swings around the rotation shaft provided on the bottom surface of the horizontal portion or the inclined portion of the supply oil passage. Therefore, in a static pressure state where there is no oil flow, the valve body is positioned along the bottom surface of the supply oil passage by its own weight and maintains the valve open state. According to this configuration, the urging means for maintaining the valve open state in the static pressure state is not required, and the configuration of the check valve can be simplified.

  Furthermore, it is preferable that an oil reservoir portion into which oil can flow is provided on a bottom surface of a portion of the supply oil passage where the check valve is provided.

  According to this characteristic configuration, when the valve body is in a backflow state in which the valve body is positioned along the bottom surface of the supply oil passage, the oil flows into the oil reservoir, and the hydraulic pressure inside the oil reservoir increases. . As a result, the oil pressure acts on the surface of the valve body facing the oil reservoir, and the valve closing state can be realized more quickly, so that more oil can be left in the supply oil passage. It becomes possible.

  In addition, it is preferable that the check valve is provided above the oil level in the oil pan when the engine is operating.

  In order to allow more oil to remain in the supply oil path when the engine is stopped, it is desirable that the check valve be positioned as close to the oil pan as possible. However, if the check valve is positioned below the oil level of the oil pan when the engine is stopped, the check valve is easily affected by the oil in the oil pan, and the valve closing operation with the backflow oil is performed smoothly. There is a risk of not.

  Therefore, as in this feature configuration, when the check valve is provided above the oil level in the oil pan when the engine is operating, the check valve is at least immediately after the engine is stopped. Will be above. Accordingly, it is possible to leave a large amount of oil in the supply oil passage while realizing a smooth valve closing operation using the oil in the backflow state.

  Furthermore, it is preferable that the check valve is provided above the maximum height of the oil level in the oil pan.

  According to this characteristic configuration, even when the engine stop state continues for a long time and the oil level of the oil pan gradually increases, the check valve is surely positioned above the oil level of the oil pan. Therefore, even after the check valve is once closed, the influence of the oil stored in the oil pan hardly affects the check valve, and the closed state can be more reliably maintained.

It is a figure showing the whole oil supply device composition concerning an embodiment of the present invention. It is explanatory drawing which shows the arrangement | positioning position of a non-return valve. It is sectional drawing of a non-return valve. It is a top view of a check valve. It is sectional drawing of the non-return valve which concerns on another embodiment. It is sectional drawing of the non-return valve which concerns on another embodiment. It is sectional drawing of the non-return valve which concerns on another embodiment.

  An embodiment of an oil supply device according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating the overall configuration of the oil supply apparatus 1. The oil supply apparatus 1 shown in the present embodiment includes an oil pan 11 formed at the bottom of the engine 2, an oil strainer 12 that removes foreign matters contained in oil stored in the oil pan 11, an oil pan 11, and a later description. The oil pump 15 connected to the oil pump 15, the check valve 14 provided in the oil supply passage 13, the oil pump 15 that pumps up the oil stored in the oil pan 11, and the oil pump 15. And an oil filter 16 for filtering the oil and a lubricating oil passage 17 for supplying the oil to each part of the engine 2. In addition, the structure of the oil supply apparatus 1 is not limited to the above, It is also possible to employ | adopt another structure, such as providing the oil cooler for cooling oil.

  When the engine 2 is in operation, the vertical movement of the piston 23 inside a cylinder (not shown) is transmitted to the crankshaft 21 via the connecting rod 22 and converted into rotational movement. The rotation of the crankshaft 21 activates the oil pump 15 that is directly connected to the crankshaft 21, and the oil stored in the oil pan 11 is pumped up. In order to stabilize the rotation of the crankshaft 21, the crankshaft 21 is provided with a balance weight 21a. If a part of the balance weight 21 a is soaked in the oil stored in the oil pan 11, the oil in the oil pan 11 scatters due to the rotational movement of the balance weight 21 a, and the cylinder or piston 23 is efficient. Can be supplied with lubricating oil.

  A relatively large foreign matter contained in the oil in the oil pan 11 is removed by the oil strainer 12. The oil that has passed through the oil strainer 12 reaches the oil pump 15 via the supply oil passage 13. The oil discharged from the oil pump 15 is filtered by the oil filter 16 to remove fine foreign matters and dirt that could not be removed by the oil strainer 12. The oil filtered by the oil filter 16 is supplied to each part such as the crankshaft 21 and the camshaft 24 via the lubricating oil passage 17 and functions as lubricating oil.

  The camshaft 24 is a so-called twin cam system, and there are two camshafts, one used for the intake valve 25 and one used for the exhaust valve 26. The intake valve 25 and the exhaust valve 26 are configured to repeatedly open and close as the cam 24a integrally formed with the camshaft 24 rotates.

  A valve opening / closing timing control device 27 is disposed at one end of each camshaft 24. The valve opening / closing timing control device 27 is controlled to advance or delay the rotational phase of the camshaft 24 relative to the rotational phase of the crankshaft 21. Then, by appropriately adjusting the timing of opening and closing of the intake valve 25 or the exhaust valve 26 by the valve opening / closing timing control device 27, fuel efficiency improvement and output improvement can be achieved.

  The valve opening / closing timing control device 27 is configured to be operated by the oil pressure of the oil flowing through the lubricating oil passage 17, and needs a certain oil pressure, that is, a certain amount of oil in order to operate properly. In the present embodiment, the oil flowing through the lubricating oil passage 17 will be described as having both a function as a lubricating oil and a function as a working oil of the valve opening / closing timing control device 27. However, it is possible to function not only as hydraulic fluid for the valve timing control device 27 but also as hydraulic fluid for other hydraulic actuators such as a piston jet.

  In a hybrid vehicle or a vehicle equipped with an idling stop mechanism, the operation needs to be smoothly continued or restarted after the engine is restarted. Therefore, a certain amount of oil must be quickly supplied to the valve opening / closing timing control device 27. In order to satisfy such requirements, the oil supply device 1 according to the present invention supplies a check valve 14 that switches to a closed state when the oil changes to a backflow state in which the oil flows from the oil pump 15 to the oil pan 11. It is provided on the road 13. The check valve 14 allows oil that flows back to the oil pan 11 when the engine is stopped to remain in the supply oil passage 13. As a result, when the engine is started, oil remaining in the supply oil passage 13 is pumped up by the oil pump 15, so that quick oil supply is possible. Further, since the check valve 14 is disposed in a portion where the flow passage area of the supply oil passage 13 does not change, the amount of oil supply is stabilized, and fluctuations in hydraulic pressure can be suppressed. In the present embodiment, as shown in FIG. 2, the check valve 14 is disposed in the inclined portion of the supply oil passage 13, but may be disposed in the horizontal portion of the supply oil passage 13. .

  The oil supplied to each part of the engine 2 by the lubricating oil passage 17 falls while lubricating each part of the engine 2 or flows down along the inner wall of the engine 2 and returns to the oil pan 11. While the engine 2 is operating, oil circulates through each part, and the oil in the oil pan 11 decreases and the oil level becomes low. The oil level at this time is indicated by Low in FIG. When the engine 2 is stopped and the oil from each part starts to return, the oil level of the oil pan 11 gradually increases from Low. If the engine stop state is continued for a sufficiently long time, the oil level of the oil pan 11 reaches the maximum height, and the oil level does not increase any more. The oil level at this time is indicated by Max in FIG. The oil strainer 12 is disposed at a position lower than the low level and capable of maintaining the oil immersion state so that the oil pump 15 can pump out oil even when the vehicle runs on an inclined surface or an uneven road and the oil surface is inclined. Is done.

  As shown in FIG. 2, the check valve 14 is preferably disposed above the Max level of the oil surface of the oil pan 11. If the check valve 14 is positioned below the oil level of the oil pan 11, the check valve 14 is easily affected by the oil in the oil pan 11, and a force in the valve opening direction acts on the check valve 14. It becomes easy to do. Therefore, as described above, when the check valve 14 is disposed above the Max level of the oil level of the oil pan 11, the check valve 14 is always positioned above the oil level of the oil pan 11, It is possible to prevent the valve from being easily opened by the oil in the oil pan 11.

  However, in a hybrid vehicle or a vehicle equipped with an idling stop mechanism, the check valve 14 is set to ensure the necessary oil amount (for example, the oil amount necessary for the operation of the valve timing control device 27) immediately after the engine restarts. There is a case where it is desired to increase the oil remaining in the supply oil passage 13 by arranging it at a position as low as possible. In such a case, the check valve 14 can be disposed below the Max level of the oil surface of the oil pan 11. At this time, if the check valve 14 is disposed above the Low level, which is the height of the oil level of the oil pan 11 when the engine is operating, at least when the oil switches to the backflow state immediately after the engine stops. Since the check valve 14 is positioned above the oil level of the oil pan 11, it is easy to close the valve and is suitable.

  Next, based on FIG.3 and FIG.4, the detail of the non-return valve 14 is demonstrated. FIG. 3 is a cross-sectional view of the check valve 14, where the solid line indicates the valve open state and the two-dot chain line indicates the valve closed state. FIG. 4 is a plan view of the check valve 14. 3 and 4, the solid arrow indicates the oil flow in the forward flow state, and the two-dot chain arrow indicates the oil flow in the reverse flow state.

  The check valve 14 includes a valve body 31 and a rotation shaft 32, and the valve body 31 is pivotally supported by a rotation shaft 32 provided on the bottom surface 13 a of the inclined portion of the supply oil passage 13 so as to be swingable. . The rotation shaft 32 is provided so as to be orthogonal to the longitudinal direction of the supply oil passage 13. The end of the valve body 31 on the oil pan 11 side is cantilevered, and the end opposite to the cantilevered side, that is, the end of the oil pump 15 is a free end. .

  The supply oil passage 13 has a rectangular cross-sectional shape, and the valve body 31 is a rectangular flat plate member having a width equivalent to the rectangular cross section of the supply oil passage 13. Further, the length L of the valve body 31 is set so that the supply oil passage 13 can be closed by the free end of the valve body 31 coming into contact with the upper surface 13b of the supply oil passage 13 when the valve is closed. It is larger than the cross-sectional height H. In order to improve the sealing performance in the valve-closed state, a sealing material can be provided on the outer peripheral portion of the valve body 31, the inner wall surface of the supply oil passage 13, or the like.

  In the present embodiment, a rectangular seal member 34 having the same width as the valve body 31, one end in the length direction being attached to the rotation shaft 32 and the other end extending to the oil pan 11 side is provided. Provided. Since the seal member 34 is attached to the rotating shaft 32, the seal member 34 swings in conjunction with the valve body 31. When the check valve 14 is in the open state, the seal member 34 is configured to extend obliquely from the bottom surface 13 a of the supply oil passage 13 toward the oil pan 11. The seal member 34 is made of a flexible material (for example, heat-resistant rubber), and in contact with the bottom surface 13a of the supply oil passage 13 in a valve-closed state, the seal member 34 bends, thereby forming the rotation shaft 32 and the bottom surface 13a. Close the minute gap between them. As a result, the oil in the space where the valve body 31 is closed can be prevented from flowing down from the oil pump 15 to the oil pan 11 side.

  The angle formed by the seal member 34 with the bottom surface 13a of the supply oil passage 13 when the check valve 14 is open is equal to the angle formed by the valve body 31 and the bottom surface 13a when the check valve 14 is closed. Is preferable. If comprised in this way, the seal member 34 will contact | abut to the bottom face 13a just before or simultaneously with the non-return valve 14 reaching a valve closing state. Therefore, during the valve closing operation, it is possible to prevent the seal member 34 from contacting the bottom surface 13a to suppress the rotation of the rotating shaft 32 and prevent the smooth valve closing operation. With such a seal member 34, it is possible to suppress effects such as deterioration in quickness of valve opening and closing operations due to adsorption action and deformation, deterioration in slidability of the valve body 31, and the like. It should be noted that providing such a seal member 34 is not an essential requirement of the present invention.

  At the free end of the valve body 31, there is an inclined portion 33a that protrudes at a constant angle toward the upper surface 13b of the supply oil passage 13, and is connected to the inclined portion 33a and is substantially parallel to the bottom surface 13a of the supply oil passage 13 in the valve-open state. A pressure receiving portion 33 is formed, which includes a parallel portion 33b extending in the vertical direction. The pressure receiving portion 33 is formed over the entire width direction of the valve body 31. When the oil in the backflow state flows into the inflow space S formed between the pressure receiving portion 33 and the bottom surface 13a of the supply oil passage 13, both the inclined portion 33a and the parallel portion 33b are perpendicular to the valve closing side. The valve is closed by applying a force in the direction (upward right in FIG. 3). As a result, the distal end portion of the pressure receiving portion 33 (parallel portion 33b) comes into contact with the upper surface 13b of the supply oil passage 13 and closes the supply oil passage 13. An inflow space S is formed between the bottom surface 13a of the supply oil passage 13, and a force toward the valve closing side is applied to the valve body 31 by the oil flowing into the inflow space S, so that the supply oil passage 13 is in a closed state. The pressure receiving portion 33 is not limited to that shown in FIG. 3 as long as the supply oil passage 13 can be closed by contacting the upper surface 13b. For example, the shape may be such that the inclined portion 33a extends to the end.

  As shown in FIG. 3, the valve body 31 of the check valve 14 is configured to be along the bottom surface 13 a of the supply oil passage 13 in the open state, so that the supply oil passage 13 is almost fully opened in the valve open state. It will be in the state. Furthermore, since the parallel part 33b connected to the inclined part 33a is provided, in the forward flow state where the oil flows in the direction from the oil pan 11 to the oil pump 15, the oil flow is hardly disturbed, and wasteful energy loss is suppressed. Can do. Accordingly, it is possible to suppress the oil flow from being disturbed or disturbed by the presence of the check valve 14 in the forward flow state, and to smoothly supply the oil.

  As shown in FIG. 3, the inclination angle and size of the supply oil passage 13 and the shape and size of the valve body 31 are such that the vector vertically downward from the center of gravity G of the valve body 31 in the closed state is the valve opening side. Adjusted to act as a force on. By defining the center of gravity G of the valve body 31 in the closed state in this way, the valve body 31 is positioned along the bottom surface 13a of the supply oil passage 13 by its own weight in a static pressure state where no oil flows. To do. Thus, since the check valve 14 is configured to maintain the valve open state in a static pressure state without oil flow, switching from the valve closed state to the valve open state can be realized efficiently and quickly. The

[Another embodiment]
Another embodiment according to the present invention will be described with reference to FIG. The same parts as those in the previous embodiment are denoted by the same reference numerals. In the present embodiment, the valve body 31 of the check valve 14 does not have the inclined portion 33a and the parallel portion 33b, and is configured as a completely flat member. Instead, a protruding portion 13 c is formed on a part of the bottom surface 13 a of the supply oil passage 13, and the end portion of the valve body 31 protruding from the protruding portion 13 c functions as the pressure receiving portion 33. According to this embodiment, since the valve body 31 has a uniform flat plate shape, the oil flow in the forward flow state can be made smoother. The protruding portion 13c may be provided over the entire width direction of the bottom surface 13a of the supply oil passage 13, or may be provided only in a part of the width direction.

  Still another embodiment will be described with reference to FIG. This embodiment has the same basic configuration as the embodiment of FIG. 3, but an oil reservoir 18 through which oil can flow is provided in a portion of the bottom surface 13 a of the supply oil passage 13 where the check valve 14 is provided. Is different. The oil reservoir 18 in the present embodiment is provided so as to cover the entire area of the valve body 31 in the valve-open state in which the valve body 31 is positioned along the bottom surface 13 a of the supply oil passage 13. Further, the oil reservoir 18 is configured to communicate with the inflow space S in the valve open state, and is configured not to communicate with the supply oil passage 13 on the oil pan 11 side with respect to the rotating shaft 32. Yes.

  With the above configuration, when the oil in the backflow state flows into the oil reservoir 18 via the inflow space S, the hydraulic pressure inside the oil reservoir 18 increases, and the increased hydraulic pressure faces the oil reservoir 18. It acts on the entire lower surface of the valve body 31. Therefore, the valve closing state can be realized more quickly, so that more oil can be left in the supply oil passage 13. The oil reservoir 18 is not necessarily formed in the entire region of the valve body 31 in the valve open state, and may be formed only in a partial region.

  In another embodiment shown in FIG. 7, the configuration of the seal member 34 is changed. In this embodiment, the extension line in the length direction of the seal member 34 does not pass through the center of the rotation shaft 32, and the upper surface of the supply oil passage 13 is higher than the center of the rotation shaft 32 when the check valve 14 is in the valve open state. It is comprised so that it may become substantially parallel with the bottom face 13a in the position of the side of 13b. When the seal member 34 is arranged in this way, a space exists between the seal member 34 and the bottom surface 13a in the valve-opened state. Therefore, for a while after the valve-closing operation is started, the seal member 34 is kept at the bottom surface 13a. Does not abut and does not deform. Therefore, the valve closing operation can be performed quickly. In addition to this, the thickness of the seal member 34 is reduced so that the seal member 34 is not in contact with the bottom surface 13a as much as possible until just before the valve closing state is reached, or the seal member 34 is triangular in a sectional view in the length direction. It is also possible to have a shape.

[Other Embodiments]
(1) The cross-sectional shape of the supply oil passage 13 is not limited to a rectangle, and other shapes may be employed. In addition, the shape of the valve body 31 can be appropriately changed according to the shape of the supply oil passage 13.
(2) As a configuration for maintaining the check valve 14 in the open state in the static pressure state, an appropriate urging member can be provided in addition to utilizing the dead weight of the valve body 31. When the biasing member is used, the rotation shaft 32 may be provided on the upper surface or the side surface of the supply oil passage 13, and the check valve 14 may be provided in a vertical portion of the supply oil passage 13. is there.
(3) The valve body 31 can be made of a substance having a lower density than oil (for example, a heat-resistant foaming resin). In this case, when the supply oil passage 13 is filled with oil, the responsiveness of the valve closing operation can be further improved by the synergistic effect of the oil flow and the buoyancy generated in the valve body 31.

  The present invention can be applied to an oil supply device that pumps oil stored in an oil pan by an oil pump and supplies the oil to each part of the engine.

DESCRIPTION OF SYMBOLS 1 Oil supply apparatus 2 Engine 11 Oil pan 13 Supply oil path 13a Bottom surface 14 Check valve 15 Oil pump 18 Oil reservoir part 31 Valve body 32 Rotating shaft 33 Pressure receiving part

Claims (7)

An oil pan formed at the bottom of the engine;
An oil pump that pumps the oil stored in the oil pan;
A supply oil path connecting the oil pan and the oil pump;
The valve is maintained in a static pressure state where there is no oil flow and a forward flow state where oil flows in a direction from the oil pan to the oil pump, and the oil is supplied from the oil pump to the oil pump. An oil supply device comprising: a check valve that switches to a closed valve state when it changes to a backflow state that flows in a direction toward the pan.   A valve body of the check valve is pivotally supported by a pivot shaft provided in the supply oil passage so as to be swingable, and is configured to be along an inner wall surface of the supply oil passage in the valve open state. The oil supply apparatus according to claim 1.   The pressure receiving part which receives the force to the side of the said valve closing state by the oil of the said backflow state is provided in the edge part on the opposite side to the side by which the cantilever axis | shaft is supported of the said valve body. Oil supply device.   The oil check device according to claim 3, wherein the check valve is disposed in a horizontal portion or an inclined portion of the supply oil passage, and the rotation shaft is provided on a bottom surface of the supply oil passage.   The oil supply device according to claim 4, wherein an oil reservoir portion into which oil can flow is provided on a bottom surface of a portion of the supply oil passage where the check valve is provided.   The oil check device according to any one of claims 1 to 5, wherein the check valve is provided above an oil level in the oil pan when the engine is operating.   The oil check device according to any one of claims 1 to 6, wherein the check valve is provided above a maximum oil level height in the oil pan.

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