JP2017145890A - Deaeration structure of strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deaeration structure capable of effectively discharging trapped air in a strainer generated during stop of a pump.SOLUTION: A deaeration mechanism for communicating the inside and outside of a strainer, is disposed on a position different from a discharge port for discharging oil inside of the strainer to an oil pump. The deaeration mechanism has an air flow channel 131 communicating the inside and outside of the strainer, and a floating valve 132 for opening and closing the air flow channel by buoyancy by the oil. The floating valve has a first float 133 positioned inside of the strainer, and a second float 134 positioned outside of the strainer. The first float and the second float are disposed at an upstream side and a downstream side of the air flow channel, and displaceable between valve closing positions P1 and P3 and valve opening positions P2 and P4 according to variation of oil levels Si and So inside and outside of the strainer.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a strainer air vent structure.

  Strainers installed inside oil pans such as engines and automatic transmissions may generate abnormal noise from the oil pump or reduce suction efficiency when air is mixed into the oil when the oil inside the strainer is sucked by the oil pump. Cause.

  In order to suppress such deterioration of the function of the oil pump, a structure in which an air reservoir is not easily generated in the strainer, a structure in which an air vent hole is provided, a structure in which air is not mixed into the strainer, etc. Various techniques have been proposed (see, for example, Patent Documents 1 to 4).

JP 2011-112133 A JP 2006-046142 A Japanese Patent No. 5179871 Japanese Patent No. 5688400

  Recent vehicles are equipped with a so-called idling stop technology for stopping engine idling when the vehicle is stopped in order to achieve low fuel consumption of the engine. When the engine is stopped by this idling stop technology, the oil pump of the automatic transmission is also stopped, so that oil is not sucked into the strainer. In such a state, minute bubbles mixed in the oil float upward in the strainer and gradually increase to form an air reservoir.

  If the oil pump is restarted with the air reservoir remaining, the air staying in the air reservoir when the oil is drawn from the strainer by the oil pump will also be sucked in, causing abnormal noise and pumping efficiency. May cause a decrease in

  However, none of the above prior arts has a function of discharging the air reservoir generated when the oil pump is stopped by utilizing the displacement of the oil level inside and outside the strainer, and will be equipped with idling stop technology in the future. It is assumed that application to vehicles will be indispensable.

  The present invention has been made in view of the above problems, and an object of the present invention is to realize a strainer air venting structure capable of effectively discharging an air reservoir generated when the pump is stopped by utilizing the displacement of the oil level inside and outside the strainer. That is.

  In order to solve the above-mentioned problems and achieve the object, the strainer air vent structure of the present invention sucks oil outside the strainer (100) by the suction force of the oil pump (150), and removes the filter part (120). The air vent structure of the strainer (100) that discharges to the oil pump (150) through a position different from the discharge port (113) that discharges the oil inside the strainer (100) to the oil pump (150) An air vent mechanism (130) that communicates the inside and outside of the strainer (100) is provided, and the air vent mechanism (130) includes an air flow path (131) that communicates the inside and outside of the strainer (100), and oil. A floating valve (132) for opening and closing the air flow path (131) by buoyancy, and the floating valve (1 2) includes a first float (133) located inside the strainer (100) and a second float (134) located outside the strainer (100), and the first float (133) And the second float (134) is arranged on the upstream side and the downstream side of the air flow path (131), according to the fluctuation of the oil level (Si, So) of each oil inside and outside the strainer (100). It can be displaced between the valve closing positions (P1, P3) and the valve opening positions (P2, P4).

  ADVANTAGE OF THE INVENTION According to this invention, the air vent structure of a strainer which can discharge | emit effectively using the displacement of the oil level of the oil inside and outside a strainer can be implement | achieved by the air reservoir part generated when a pump stops.

It is typical sectional drawing of the strainer of this embodiment. It is a typical sectional view showing the air vent mechanism of the strainer of this embodiment. It is operation | movement explanatory drawing of the air bleeding mechanism of the strainer of this embodiment. It is operation | movement explanatory drawing of the air bleeding mechanism of the strainer of this embodiment. It is a figure which shows the operating state of the floating valve according to the oil level change inside and outside the strainer of this embodiment. It is a figure explaining the state change inside and outside a strainer according to the driving | running state of the vehicle of this embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic cross-sectional view of the strainer of the present embodiment. FIG. 2 is a schematic cross-sectional view showing the air vent mechanism of the strainer of the present embodiment. 3 and 4 are operation explanatory views of the air release mechanism of the strainer of the present embodiment. FIG. 5 is a diagram showing an operating state of the floating valve according to the oil level change inside and outside the strainer of the present embodiment. FIG. 6 is a diagram for explaining a state change inside and outside the strainer according to the driving state of the vehicle of the present embodiment.

  The strainer 100 of this embodiment includes a hollow case part 110 having a predetermined volume, a filter part 120 provided inside the case part 110, and an air vent mechanism provided so as to communicate the inside and outside of the case part 110. 130. The strainer 100 is disposed inside an oil pan 160 that stores lubricating oil for a lubricated portion such as an automobile engine or an automatic transmission, and control oil, for example. Connected to the suction). In the strainer 100, an oil suction port 114 through which oil is sucked by the oil pump 150 opens below the oil level of the oil inside the oil pan 160, and an oil discharge port 113 that drains the oil inside the strainer 100 is connected to the oil pump 150. When the oil pump 150 is connected and the oil pump 150 is operated, the oil flows into and fills the strainer 100 from the oil suction port 114. In addition, when the oil pump is stopped when the engine is stopped when the vehicle is stopped after traveling, the strainer 100 returns to the oil pan, so that the oil level So of the oil pan rises. The oil level So in the oil pan is higher than the strainer upper surface 115. Note that the oil in the oil pan 160 is in a high temperature state including minute bubbles V1 after the vehicle travels.

  The case portion 110 has a hollow interior by joining the open end portions 111A and 112A of the bottomed container-like first case 111 and the second case 112. Assuming that the first case 111 is the upper case and the second case 112 is the lower case, the upper case 111 has an oil discharge port 113 through which oil is discharged from the inside of the strainer 100 by the suction force of the oil pump 150 and an air described later. An extraction mechanism 130 is provided, and the lower case 112 is provided with an oil suction port 114 that sucks oil into the strainer 100 from the outside of the strainer 100 (inside the oil pan 160) by the suction force of the oil pump 150. And the mesh-like filter part 120 which can permeate | transmit air and cannot pass a foreign material is provided so that the inside of the case part 110 may be divided up and down.

  The oil discharge port 113 of the upper case 111 opens upward, and the oil suction port 114 of the lower case 112 opens downward. Further, the oil discharge port 113 of the upper case 111 and the oil suction port 114 of the lower case 112 are separated from each other, and the positional relationship that does not oppose vertically, for example, the position of the oil discharge port 113 of the upper case 111 is near the left corner. In this case, the position of the oil suction port 114 of the lower case 112 is configured to be separated from each other and not to face each other, such as near the right corner. In this way, the oil sucked from the suction port 114 by the oil pump 150 is configured not to flow directly from the discharge port 113 to the oil pump 150. Similarly, the oil discharge port 113 and the air vent mechanism 130 of the upper case 111 are also spaced apart from each other, for example, when the position of the oil discharge port 113 is near the left end, the position of the air vent mechanism 130. Are configured so as to be in a positional relationship apart from each other, such as near the right end.

  And the upper surface part 115 of the upper case 111 inclines upward as it distances from the oil discharge port 113, and forms the slope part from which the air bleeding mechanism 130 becomes the uppermost part. As a result, the minute air bubbles V1 sucked from the oil suction port 114 of the lower case 112 by the oil pump 150 and mixed in the oil flowing into the upper case 111 through the filter unit 120 floated upward in the upper case 111. At this time, the oil moves from the oil discharge port 113 side to the air vent mechanism 130 side along the slope of the upper case 111 and gradually increases to form an air reservoir V at the lower portion of the air vent mechanism 130. Further, the air bubbles floating on the upper surface portion 115 inside the strainer 100 are moved along the inclined surface portion and collected in the air vent mechanism 130 installed at the uppermost part, and the first float 133 of the air vent mechanism 130 has the buoyancy due to oil. The air reservoir V can be formed so as to be displaced up and down by the change in the oil level. Further, the air reservoir portion V can be stopped at the lower portion of the air vent mechanism 130 by the inclined surface portion of the upper surface portion 115, that is, can be stopped so as not to move to the oil discharge portion 113. The shape of the slope is not limited to a flat surface, but may be any shape, such as a curved shape or a step shape, as long as the bubble V1 is moved to the air reservoir V and air does not flow backward from the air reservoir V. There may be.

  Then, the air staying in the air reservoir V is discharged to the outside of the strainer 100 by the opening / closing operation of the floating valve 132 of the air vent mechanism 130 described later.

  The air vent mechanism 130 includes an air passage 131 that communicates with the inside and outside of the upper case 111, a floating valve 132 and a valve seat portion 135 that open and close the air passage 131 by receiving buoyancy due to oil, and a valve seat portion that connects the floating valve 132 to the valve seat portion. And a float guide portion 136 that is displaceably held with respect to 135. The floating valve 132 includes a first float 133 located inside the strainer 100 and a second float 134 located outside the strainer 100. The floats 133 and 134 are arranged in series vertically on the upstream side and the downstream side of the air flow path 131, and are closed in contact with the valve seat portion 135 in accordance with fluctuations in the oil levels Si and So of the oil inside and outside the strainer 100. It can be displaced in the vertical direction between the valve position and the valve opening position separated from the valve seat part 135. Each of the floats 133 and 134 has a spherical outer shape, and the valve seat portion 135 has a conical valve seat surface on which the floats 133 and 134 come into fluid tight contact. Thereby, the floats 133 and 134 can self-adjust the contact position (valve closing position) with the valve seat part 135 to an appropriate position. The shapes of the floats 133 and 134 are not limited to a sphere, and may be a rectangle, a cylinder, a cone, a pyramid, or the like. Further, the shape of the valve seat surface of the valve seat portion 135 is not limited to a conical shape, and may be a shape that matches the outer shape of the float 133. Each of the first float 133 and the second float 134 is a material (for example, a resin material) that is durable to high-temperature oil containing minute bubbles V1 inside the oil pan 160 and has sufficient buoyancy. ) Or a structure (for example, a hollow shape).

  The float guide part 136 is located inside the strainer 100 and guides the vertical movement of the first float 133. The float guide part 136 is located outside the strainer 100 and guides the vertical movement of the second float 134. And the second guide part 138 is configured so that the first float 133 and the second float 134 are appropriately operated during opening and closing. The first guide portion 137 and the second guide portion 138 are formed with openings 139 and 140 for discharging air staying in the air reservoir portion V, respectively. Further, the opening 140 of the second guide portion 138 is covered with the filter member 141, and foreign matter mixed in the oil when the oil outside the strainer 100 (in the oil pan 160) flows back into the strainer 100 is inside the strainer 100. Filter so that it does not flow into.

  In the air vent mechanism 130, the first float 133 of the floating valve 132 is oil filled in the strainer 100 when the air reservoir V is not formed in the strainer 100 (the upper surface portion 115 of the upper case 111). When the valve position (P1) is increased by the buoyancy caused by the air, and the minute bubbles V1 inside the strainer 100 rise to the upper part and move along the slope portion, and gradually increase to form the air reservoir portion V, the air reservoir portion As the volume of the air staying in V increases, the oil level Si inside the strainer 100 is lowered, so the first float 133 is also lowered to the valve opening position (P2). Further, the second float 134 is displaced to the valve opening position (P4) by buoyancy due to oil in a state where the oil level So of the oil outside the strainer 100 (inside the oil pan 160) is higher than the second float 134, When the oil level So changes to a position lower than the second float 134, the oil level So descends due to its own weight and is displaced to the valve closing position (P3).

<Oil level change of oil in oil pan and strainer>
When the oil pump 150 is activated, the oil in the oil pan 160 flows into the strainer 100 from the oil suction port 114 and fills the strainer 100. Further, the oil level So of the oil outside the strainer 100 (inside the oil pan 160) is lowered when the oil inside the strainer 100 sucked by the oil pump 150 is used for lubrication and control of the lubricated part. It tilts by turning and sudden acceleration / deceleration. For this reason, the upper surface portion 115 of the strainer 100 may be exposed from the oil surface So of the oil inside the oil pan 160.

  When the vehicle stops and the engine stops and the oil pump 150 stops, the oil used for lubrication and control returns to the oil pan 160. Therefore, the oil level So outside the strainer 100, that is, the oil level of the oil pan 160 So rises to a position higher than the upper surface portion 115 of the strainer 100.

<Air reservoir inside strainer>
When the vehicle is stopped and the engine is also stopped, the oil pump 150 is deactivated, and the minute bubbles V1 mixed in the oil in the strainer 100 gradually rise to reach the upper surface portion 115 inside the strainer 100. Then, the air bubbles that have reached the upper surface portion 115 inside the strainer 100 move along the slope portion, and gather at the air vent mechanism 130 installed at the uppermost portion to form an air reservoir portion V.

<Operation of air vent mechanism>
When the oil level So of the oil in the oil pan 160 is located above the second float, the second float 134 floats and opens (P4) due to the buoyancy caused by the oil, and the oil level So When positioned below the second float, it descends by its own weight and closes (P3).

  Further, when the inside of the strainer 100 is filled with oil, the first float 133 is closed by valve lift (P1) due to buoyancy caused by the oil, and the air vent mechanism 130 when the bubbles V1 gradually stay. Since the oil surface Si around the lower surface gradually falls, the first float 133 floating on the oil surface Si descends and opens (P2), and the accumulated air passes through the air flow path 131 to the inside of the strainer 100. To the oil pan 160.

  When the air is discharged, the oil level Si inside the strainer 100 rises again, the first float 133 rises and closes (P1), and the second float 134 remains open (P4).

  When the oil pump 150 is operated in this state, the air reservoir V is not formed on the upper surface portion 115 of the strainer 100, so that air is sucked into the pump 150 and an abnormal suction noise of the pump is generated. Inhalation efficiency is not reduced.

<Air vent mechanism filter member>
When the oil pump 150 is activated during air discharge with the first float 133 opened (P2), the inside and outside of the strainer 100 are instantaneously communicated via the air flow path 131, and the outside of the strainer 100 (oil pan 160) ), It is assumed that the oil flows back instantaneously. However, since the opening 140 of the second guide portion 138 is covered with the filter member 141, the backflowing oil is filtered and foreign matter is prevented from being mixed. In addition, the inflow of oil from the opening 140 of the second guide portion 138 into the strainer 100 is instantaneous, and the second float 134 is closed by the rise of the first float 133 or the decrease of the oil level So outside the strainer 100. The valve (P3) does not last.

<Opening / closing operation of floating valve>
The first float 133 is opened (P2) when the oil level Si inside the strainer 100 is lowered, and the second float 134 is floated and opened (P4) relative to the oil level So outside the strainer 100. Air is discharged from the air reservoir V inside the strainer 100. When air is discharged, the first float 133 rises and closes (P1). Even when the oil pump 150 is activated while the first float 133 is moving up and the external oil is instantaneously sucked from the air flow path 131, the sucked oil passes through the filter member 141. Contamination is avoided. Thereafter, when the inside of the strainer 100 is filled with oil, the first float 133 is lifted by the buoyancy caused by the oil and is closed (P1), so that the suction of oil is also stopped.

  FIG. 5 illustrates the relationship between the operating state of the floating valve 132 of the present embodiment, the change of the air reservoir V inside the strainer 100 and the oil level So outside the strainer 100.

  State I in FIG. 5 is a state in which an air reservoir V is formed inside the strainer 100, the oil level So outside the strainer 100 is high, and both floats 133, 134 are opened (P2, P4), so that the air is Can be discharged.

  In state I, since the oil pump 150 is not operating and the engine and the automatic transmission are stopped, the oil used for control and lubrication returns to the oil pan 160 and the oil level So of the oil pan 160 rises. In the strainer 100, the minute bubbles V1 gradually increase with the passage of time to form the air reservoir V at the upper portion, so that the oil level Si inside the strainer 100 is lowered.

  State III occurs before the occurrence of the air reservoir V after the vehicle stops running or after the air is discharged, but the first float 133 is closed (P1), and no oil flows from the outside.

  In the state IV (normal running state), as shown in FIG. 3, the oil pump 150 is operated and the oil is used for control and lubrication, so that the oil level Si inside the strainer 100 rises and the strainer 100 outside (oil pan) The oil level So of the oil inside 160 is lowered. The first float 133 is lifted by the buoyancy of the oil inside the strainer 100 and closed (P1), and the second float 134 is closed by its own weight (P3). The air inside 160 is not sucked into the strainer 100.

  As shown in FIG. 4, the state II is a state in which the oil level So outside the strainer 100 is lowered due to the vehicle tilting or the like, and there is actually almost no state in which the air reservoir V is generated inside the strainer 100. The state in which the oil level So outside the strainer 100 descends when the air reservoir V is generated (state I) is momentarily when the vehicle is turning or suddenly accelerating / decelerating, for example, when suddenly starting from a state where the vehicle stops on a steep slope. Although it may occur, even if the first float 133 is instantaneously opened (P2), the second float 134 is closed (P3). The internal air is not sucked into the strainer 100, and this state ends immediately.

  As the state change, when the vehicle is stopped and the engine and the oil pump 150 are stopped from the state IV while the vehicle is running, the oil supplied to the lubricated part immediately returns to the oil pan 160. The state III is such that the oil level So rises. After a while, after the air is discharged through the state I in which the air reservoir V is formed, the state returns to the state III. FIG. 6 summarizes the changes in the vehicle / engine operating state and the oil levels Si and So inside and outside the strainer from state I to state IV described above.

  According to the strainer air vent mechanism 130 of the present embodiment, the air vent structure of the strainer 100 that can effectively discharge the air reservoir V generated when the oil pump is stopped using the displacement of the oil surface Si and So of the oil. It can be realized with a simple configuration.

  The above-described embodiment is an example as means for realizing the present invention, and the present invention is a modification or modification of the following embodiment without departing from the spirit thereof, for example, an electric pump instead of an engine-driven pump. It is applicable to.

  In this embodiment, the air vent structure of the strainer connected to the suction of the automatic transmission control / lubrication pump has been described. However, the present invention is not limited to this and can be applied to various oil pump applications other than the vehicle.

<Summary of Embodiment>
(Configuration 1)
An oil vent structure of the strainer 100 that sucks oil outside the strainer 100 by the suction force of the oil pump 150 and discharges the oil to the oil pump 150 through the filter unit 120, and the oil inside the strainer 100 is removed from the oil pump An air vent mechanism 130 that communicates the inside and outside of the strainer 100 is provided at a position different from the discharge port 113 that discharges to the air outlet 150. A floating valve 132 that opens and closes the air flow path 131 by the buoyancy of the first float 133 positioned inside the strainer 100 and a second float 134 positioned outside the strainer 100. And the first frame The seat 133 and the second float 134 are arranged on the upstream side and the downstream side of the air flow path 131, and the valve closing position P1, according to the fluctuations in the oil levels Si and So of the oil inside and outside the strainer 100, It can be displaced between P3 and the valve opening positions P2, P4.

  According to this configuration 1, the air vent structure of the strainer 100 that can effectively discharge the air reservoir V generated when the oil pump is stopped using the displacement of the oil surfaces Si and So of the oil inside and outside the strainer has a simple configuration. Can be realized.

(Configuration 2)
In the configuration 1, the air vent mechanism 130 has a float guide part 136 that holds the first float 133 and the second float 134 so as to be displaceable with respect to the valve seat part 135. The float guide part 136 includes: A first guide part 137 that is located inside the strainer 100 and guides the movement of the first float 133, and a second guide part that is located outside the strainer 100 and guides the movement of the second float 134. The first guide portion 137 and the second guide portion 138 are formed with openings 139 and 140 for discharging air from the air reservoir V generated inside the strainer 100, respectively. Yes.

  According to this configuration 2, the floats 133 and 134 of the floating valve 132 can be appropriately opened and closed according to the displacement of the oil surfaces Si and So of the oil inside and outside the strainer, and the air in the air reservoir V can be discharged.

(Configuration 3)
In the configuration 2, the opening 140 of the second guide portion 138 is covered with a mesh-shaped filter member 141 that allows air to pass but does not allow foreign matters to pass.

  According to this configuration 3, when the oil flows backward from the oil pan 160 into the strainer 100, foreign matter mixed in the oil can be filtered so as not to flow into the strainer 100.

(Configuration 4)
In any one of the configurations 1 to 3, the first float 133 and the second float 134 have a spherical outer shape, and the valve seat 135 has a fluid tight seal with the first float 133 and the second float 134. And has a conical valve seat surface.

  According to this configuration 4, the floats 133 and 134 can self-adjust the contact position (valve closing position) with the valve seat portion 135 to an appropriate position.

(Configuration 5)
In any one of the configurations 1 to 4, the discharge port 113 and the air vent mechanism 130 are provided at positions separated from each other, and the upper surface portion 115 of the strainer 100 is inclined upward as it is farther from the discharge port 113, The air vent mechanism 130 has a slope portion that is the uppermost portion.

  According to this configuration 5, the air bubbles floating on the upper surface portion 115 inside the strainer 100 are moved along the inclined surface portion, collected in the air vent mechanism 130 installed at the uppermost portion, and collected by the first float 133 of the air vent mechanism 130. The air reservoir V can be formed so as to be displaced up and down by the oil level change due to oil buoyancy. Further, the air reservoir V can be stopped so as not to move to the oil discharge part 113.

(Configuration 6)
In any one of the configurations 1 to 5, the strainer 100 has a suction port 114 for sucking oil outside the strainer 100 by the oil pump 150, and the discharge port 113 and the suction port 114 are separated from each other. The exhaust port 113 is connected to the oil pump 150, and the oil pump 150 is operated to be sucked into the strainer 100 from the suction port 114.

  According to this configuration 6, the oil sucked from the suction port 114 by the oil pump can be configured not to flow directly from the discharge port 113 to the oil pump.

(Configuration 7)
In any one of the configurations 1 to 6, in the air vent mechanism 130, the first float 133 is filled in the strainer 100 in a state where the air reservoir portion V is not formed in the strainer 100. When the air reservoir portion V is formed inside the strainer 100, the valve opening position P2 is increased as the volume of the air reservoir portion V increases, and the second float is reached. In the state where the oil level So of the oil outside the strainer 100 is higher than the second float 134, the valve 134 is in the valve opening position P4 due to the buoyancy caused by the oil, and the oil level So is lower than the second float 134. If it changes to a position, it will be in the valve closing position P3 with dead weight.

  According to this configuration 7, the floats 133 and 134 of the floating valve 132 are appropriately opened and closed as the oil levels Si and So of the oil inside and outside the strainer 100 rise and fall, and the air staying in the air reservoir V is discharged. can do.

DESCRIPTION OF SYMBOLS 100 ... Strainer, 110 ... Case part, 120 ... Filter part, 130 ... Air vent mechanism, 131 ... Air flow path, 133 ... 1st float, 134 ... 2nd float, 150 ... Oil pump, 160 ... Oil pan

Claims (7)

An air vent structure for the strainer (100) that sucks oil outside the strainer (100) by the suction force of the oil pump (150) and discharges the oil to the oil pump (150) through the filter part (120),
An air vent mechanism (130) that communicates the inside and outside of the strainer (100) is provided at a position different from the discharge port (113) that discharges oil inside the strainer (100) to the oil pump (150).
The air vent mechanism (130) has an air flow path (131) communicating between the inside and outside of the strainer (100), and a floating valve (132) that opens and closes the air flow path (131) by buoyancy due to oil,
The floating valve (132) includes a first float (133) located inside the strainer (100) and a second float (134) located outside the strainer (100).
The first float (133) and the second float (134) are disposed on the upstream side and the downstream side of the air flow path (131), and the oil level (Si, The strainer air vent structure is characterized in that it can be displaced between the valve closing positions (P1, P3) and the valve opening positions (P2, P4) in accordance with fluctuations in So). The air vent mechanism (130) has a float guide part (136) for holding the first float (133) and the second float (134) displaceably with respect to the valve seat part (135),
The float guide part (136) is positioned inside the strainer (100), and is positioned outside the strainer (100) and a first guide part (137) that guides the movement of the first float (133). And a second guide part (138) for guiding the movement of the second float (134),
The first guide part (137) and the second guide part (138) have openings (139, 140) for discharging air from an air reservoir (V) generated inside the strainer (100). The strainer air vent structure according to claim 1, wherein:   The opening (140) of the second guide part (138) is covered with a mesh-shaped filter member (141) through which air can pass but foreign matter cannot pass. Strainer air vent structure. The first float (133) and the second float (134) have a spherical outer shape,
The valve seat portion (135) has a conical valve seat surface on which the first float (133) and the second float (134) come into fluid tight contact with each other. The air vent structure of the strainer described in 1. The discharge port (113) and the air vent mechanism (130) are provided at positions separated from each other,
The upper surface part (115) of the strainer (100) has an inclined part that inclines upward as the distance from the discharge port (113) increases, and the air vent mechanism (130) is the uppermost part. The strainer air vent structure according to any one of claims 1 to 4, wherein the strainer is vented. The strainer (100) has an inlet (114) for sucking oil outside the strainer (100) by the oil pump (150),
The discharge port (113) and the suction port (114) are provided at positions separated from each other,
The discharge port (113) is connected to the oil pump (150), and the oil pump (150) is operated to be sucked into the strainer (100) from the suction port (114). The strainer air vent structure according to any one of claims 1 to 5. In the air vent mechanism (130), the first float (133) is filled inside the strainer (100) when no air reservoir (V) is formed inside the strainer (100). When the air reservoir (V) is formed inside the strainer (100), the valve is opened as the volume of the air reservoir (V) increases. Position (P2)
When the oil level (So) of the oil outside the strainer (100) is higher than the second float (134), the second float (134) is opened by the buoyancy caused by the oil (P4). When the oil level (So) changes to a position lower than the second float (134), the valve closing position (P3) is set due to its own weight. Strainer air vent structure.

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