JP7002394B2 - Oil strainer for vehicle power transmission - Google Patents

Description

The present invention relates to an oil strainer for filtering oil stored in an oil pan of a vehicle power transmission device and sending it to an oil pump.

For example, an oil pan at the bottom of the case of a vehicle power transmission device stores oil used for lubrication, cooling, driving of a hydraulic circuit, etc., and this oil is installed at the bottom of the case. After the foreign matter such as metal powder is removed by the strainer, it is sucked into the oil pump. The oil boosted by the oil pump is supplied to each part, lubricated and cooled in each part, and then flows through the oil pan again. After that, by repeating the same operation, each part is lubricated or cooled by oil, or the hydraulic circuit is driven.

Here, the oil strainer of the vehicle power transmission device accommodates a filter inside a closed container-shaped strainer body installed at the inner bottom of the case of the vehicle power transmission device, and the power transmission device is housed in the strainer body. An suction port that opens in the oil pan and a discharge port connected to the oil pump are formed, and the oil sucked from the suction port into the strainer body by driving the oil pump is filtered by the filter and the discharge port is used. It fulfills the function of sending out from the oil pump to the oil pump.

By the way, in such an oil strainer, if the oil level (oil level) in the oil pan is low, the oil is biased forward or backward in the oil pan in the front-rear direction of the vehicle when accelerating or decelerating the vehicle, or when climbing or descending a slope. All or part of the oil strainer's suction port may be exposed above the oil level. In such a case, the oil strainer sucks in air, the discharge pressure of the oil pump fluctuates, the operation of the power transmission device becomes unstable, or noise is generated due to the inclusion of air bubbles in the oil. Problems arise.

In order to solve the above problem, in Patent Document 1, the oil strainer is provided with an outer case, an inner case slidable with respect to the outer case, and a sealing plate fixed to the lower part of the outer case. Even if the inner case slides in the front-rear direction of the vehicle with respect to the outer case when accelerating or decelerating the vehicle, or when climbing or descending a slope, at least one of the plurality of suction ports formed in the inner case is in oil. A configuration has been proposed that opens in.

Further, in Patent Document 2, a long opening in the vehicle front-rear direction is formed on the bottom surface of the strainer body, and a mouthpiece member is fitted in the opening so as to be movable in the vehicle front-rear direction, and the mouthpiece member is fitted in the vehicle front-rear direction. Deformable cover members are provided at both ends, and even if the mouthpiece moves in the front-rear direction of the vehicle due to the inertial force generated during acceleration / deceleration of the vehicle, the mouthpiece member while sealing the opening formed in the strainer body with the cover member. Has been proposed as an oil strainer that always opens into the oil.

Further, in Patent Document 3, a suction port member is floated on the oil level of the oil in the oil pan, and the suction port member and the oil strainer are connected by a connecting pipe having flexibility or elasticity, and the oil level of the oil is described. It has been proposed that the suction port of the suction port member floating on the oil surface always opens in the oil even if the oil level changes.

Japanese Unexamined Patent Publication No. 2009-293520 Japanese Unexamined Patent Publication No. 2009-293682 Japanese Unexamined Patent Publication No. 2014-119055

However, all of the oil strainers disclosed in Patent Documents 1 to 3 have a problem that the structure is complicated and the number of parts is large, which may lead to an increase in cost.

The present invention has been made in view of the above problems, and an object of the present invention is to transmit power for a vehicle, which can prevent air from being sucked into an oil pump with a simple configuration without incurring structural complexity or cost increase. The purpose is to provide an oil strainer for the device.

In order to achieve the above object, the first invention accommodates a filter inside a closed container-shaped strainer body (5A) installed at the inner bottom of the case (3) of the vehicle power transmission device (1), and also describes the above. The strainer main body (5A) is formed with a suction port (9) opened in the oil pan (4) of the vehicle power transmission device (1) and a discharge port (7) connected to the oil pump (6). The oil sucked into the strainer body (5A) from the suction port (9) by the drive of the oil pump (6) is filtered by the filter and sent out from the discharge port (7) to the oil pump (6). In the vehicle oil strainer (5), excess oil flowing out from the oil outlet (10) that opens above the strainer body (5A) is transferred to the upper space in the rear part of the strainer body (5A) in the vehicle front-rear direction. It is characterized by being configured to supply.

Here, the oil outlet (10) and the oil supply port opened on the upper surface of the rear portion of the strainer body (5A) in the front-rear direction of the vehicle may be connected by a pipe (11).

According to the first invention, the excess oil flowing out from the oil outlet is located above the rear part of the oil strainer in the front-rear direction of the vehicle (where a cavity was conventionally generated when the vehicle is decelerating or descending a slope). Since it is supplied and stored in the strainer body, cavities are less likely to occur in the strainer body when the vehicle is decelerating or descending a slope, and the air contained in the cavities is prevented from being sucked into the oil pump, making it an oil pump. It prevents the occurrence of various problems caused by the suction of air. Since such an effect can be obtained by a simple configuration in which the oil outlet and the strainer body of the oil strainer are simply connected by a pipe or the like, the structure of the oil strainer is not complicated or the cost is increased. ..

Further, in the second invention, the filter is housed inside the closed container-shaped strainer main body (5A) installed at the inner bottom of the case (3) of the vehicle power transmission device (1), and the strainer main body (5A) is housed. A suction port (9) opened in the oil pan (4) of the vehicle power transmission device (1) and a discharge port (7) connected to the oil pump (6) are formed in the oil pump (6). The oil strainer (6) of the vehicle that filters the oil sucked into the strainer body (5A) from the suction port (9) by the drive of the filter and sends it from the discharge port (7) to the oil pump (6). In 5), the discharge port (7) is formed in the front part of the strainer body (5A) in the vehicle front-rear direction, and opens in the rear part of the strainer body (5A) in the vehicle front-rear direction when the vehicle decelerates. It is characterized in that a closed opening / closing type suction port (13) is formed.

In this case, when the acceleration sensor provided in the vehicle detects the deceleration of the vehicle, the opening / closing suction port (13) may be opened.

Further, the suction port (9) may be formed at the bottom of the middle portion of the strainer body (5A) in the vehicle front-rear direction.

According to the second invention, since the opening / closing suction port is opened when the vehicle is decelerated, the flow of oil sucked from the suction port toward the discharge port and the suction from the opening / closing suction port are discharged in the strainer body. An oil flow is generated toward the outlet, and these oil flows block the air contained in the cavity from entering the oil. Therefore, the suction of air from the oil pump is prevented, and problems such as fluctuations in the discharge pressure of the oil pump and generation of noise do not occur. Since such an effect can be obtained by a simple configuration in which the opening / closing suction port is simply formed on the strainer body, the structure of the oil strainer is not complicated and the cost is not increased.

According to the present invention, it is possible to prevent air from being sucked into the oil pump with a simple configuration without complicating the structure of the oil strainer and increasing the cost.

It is a side view in the state which the case cover of the power transmission device for a vehicle provided with the oil strainer which concerns on 1st Embodiment (1st invention) is removed. 2 is a side view of a main part of a vehicle power transmission device provided with an oil strainer according to a second embodiment (second invention) in a state where the case cover is removed (during deceleration). 2 is a side view of a main part of a vehicle power transmission device provided with an oil strainer according to a second embodiment (second invention) in a state where the case cover is removed (during acceleration).

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

[First Embodiment (First Invention)]
FIG. 1 is a side view of a vehicle power transmission device provided with an oil strainer according to the first embodiment (first invention) of the present invention in a state where the case cover is removed. The vehicle power transmission device 1 shown in the figure is a torque converter (not shown) that transmits the rotational power of an engine (not shown) as a drive source to the input shaft 2, and a torque converter (not shown) for shifting and outputting the rotation of the input shaft 2. A transmission (not shown) is housed in the case 3.

An oil pan 4 for storing the oil L is formed at the bottom of the case 3, and an oil strainer 5 according to the present invention is arranged. Further, an oil pump 6 is arranged on the back side of the front end of the oil strainer 5 in the vehicle front-rear direction (the left side in FIG. 1 is the front side of the vehicle) (the back side in the vertical direction of the paper in FIG. 1). Here, the oil pump 6 is driven by a part of the power of the engine, and although not shown, the sprocket attached to the input shaft 2 and the sprocket attached to the drive shaft of the oil pump 6 An endless chain is wound between them, and when the engine is driven and the input shaft 2 rotates, the rotation of the input shaft 2 causes the sprocket, the chain, and the oil pump 6 attached to the input shaft 2 to rotate. Since it is transmitted to the drive shaft of the oil pump 6 via the sprocket attached to the drive shaft of the oil pump 6, the oil pump 6 is driven by the rotating drive shaft.

The oil strainer 5 is configured by accommodating a filter (not shown) which is a filter material inside a strainer main body 5A having a rectangular closed container shape. A circular hole-shaped discharge port 7 is provided on the side surface of the strainer body 5A at the front end portion in the vehicle front-rear direction (left end portion in FIG. 1) facing the oil pump 6 (back side in the vertical direction of the paper surface in FIG. 1). A pipe-shaped nozzle 8 is obliquely attached downward to the middle portion of the bottom surface of the strainer body 5A in the vehicle front-rear direction. The nozzle 8 is inserted and fixed to the bottom surface of the strainer main body 5A, and the lower surface opening thereof opens to the oil L in the oil pan 4 as a suction port 9. The filter is formed in a plate shape by a fine wire mesh or a non-woven fabric. Although not shown, the discharge port 7 formed in the strainer body 5A of the oil strainer 5 and the suction side of the oil pump 6 are connected to each other by a pipe, a hose, or the like.

On the other hand, above the oil strainer 5 and the oil pump 6 of the case 3, there is a circular oil outlet 10 for the excess oil to flow out after being subjected to lubrication and cooling of each part or driving of the hydraulic circuit. It opens toward the inside of the case 3. Conventionally, the oil outlet 10 is opened as it is in the case 3, and the excess oil flowing out from the oil outlet 10 falls along the inner wall of the case 10 and returns to the oil pan 4. In the present embodiment, a circular hole-shaped oil supply port (not shown) is formed on the upper surface of the rear portion of the strainer body 5A in the front-rear direction of the vehicle, and the oil supply port and the oil outlet 10 are connected by a pipe 11. An oil cooler 12 for cooling the oil with cooling water is installed on the upper part of the case 3.

In the vehicle power transmission device 1 configured as described above, when an engine (not shown) is started, the oil pump 6 is driven by a part of the rotational power thereof as described above. By the drive, the oil L stored in the oil pan 4 is sucked into the inside of the strainer body 5A from the suction port 9 opened to the nozzle 8 attached to the bottom surface of the strainer body 5A of the oil strainer 5. The oil sucked into the strainer body 5A passes through a filter (not shown) to remove foreign substances such as metal powder, and then a discharge port that opens on the side surface of the front end portion of the strainer body 5A in the vehicle front-rear direction. It is sucked from 7 to the oil pump 6.

The oil sucked into the oil pump 6 is boosted to a predetermined pressure by the oil pump 6, then discharged, supplied to each part, used for lubrication and cooling of each part, driving of a hydraulic circuit, and the like, and then the oil cooler 12 (Illustrated), as shown by an arrow in FIG. 1, an oil (not shown) that opens from the oil outlet 10 through the pipe 11 to the rear end of the upper surface of the strainer body 5A of the oil strainer 5 in the vehicle front-rear direction. It is supplied from the supply port into the strainer body 5A and stored inside the strainer body 5A.

By the way, when the vehicle decelerates while traveling, the oil L in the oil pan 4 moves to the front of the vehicle due to inertia and is biased to the front of the vehicle as shown by diagonal lines in FIG. At this time, conventionally, in the strainer body 5A of the oil strainer 5, a cavity S not filled with the oil L is formed in the upper part of the rear end in the front-rear direction of the vehicle, and the air contained in the cavity S is the oil pump 6. The above-mentioned problems may occur due to being sucked into the air.

On the other hand, in the present embodiment, as described above, the excess oil flowing out from the oil outlet 10 passes through the pipe 11 and is located above the rear part of the trainer body 5A of the oil strainer 5 in the vehicle front-rear direction (deceleration of the vehicle). Since it is supplied to the place where the cavity S was conventionally generated during time or downhill) and stored in the strainer body 5A, the cavity S is less likely to occur in the strainer body 5A when the vehicle is decelerating or descending a slope. The suction of the air contained in the cavity S into the oil pump 6 is prevented, and the occurrence of various problems caused by the suction of air into the oil pump 6 is prevented. Since such an effect can be obtained by a simple configuration in which the oil outlet 10 and the strainer body 5A of the oil strainer 5 are simply connected by a pipe 11, the structure of the oil strainer 5 is complicated and the cost is increased. I won't invite you.

[Second Embodiment (Second Invention)]
Next, a second embodiment (second invention) of the present invention will be described. In the description of the second embodiment and the corresponding drawings, the same components as those in the first embodiment are designated by the same reference numerals, and detailed description of the parts will be omitted below. In addition, the matters other than the matters described below and the matters other than those shown in the drawings are the same as those in the first embodiment. This point is the same for the following other embodiments.

FIG. 2 is a side view of a main part of a vehicle power transmission device provided with an oil strainer according to a second embodiment of the present invention in a state where the case cover is removed (during deceleration), and FIG. 3 is a case of the vehicle power transmission device. It is a side view of a main part in a state where a cover is removed (during acceleration).

The oil strainer 5 according to the present embodiment decelerates the vehicle on the rear side surface of the strainer body 5A in the vehicle front-rear direction (the side surface on the front side of FIGS. 2 and 3 opposite to the side where the oil pump 6 is arranged). It is characterized by forming an opening / closing type suction port 13 that sometimes opens and otherwise closes, and other configurations are the same as the configuration of the oil strainer 5 according to the first embodiment.

In the oil strainer 5 configured as described above, when the vehicle decelerates, the oil L stored in the oil pan 4 moves to the front of the vehicle (left side in FIG. 2) due to inertia as shown in FIG. It moves and is biased toward the front of the vehicle, but at this time, the opening / closing suction port 13 is opened. When the oil L is biased toward the front of the vehicle, the oil level forms a slope as shown in FIG. 2, so that a cavity S is formed above the rear portion of the strainer body 5A of the oil strainer 5 in the vehicle front-rear direction. ..

However, in the present embodiment, since the open / close suction port 13 is opened as shown in FIG. 2 when the vehicle is decelerated, the air is sucked from the suction port 9 in the strainer main body 5A as shown by an arrow in FIG. An oil flow to the discharge port 7 and an oil flow to the discharge port 7 sucked from the openable suction port 13 are generated, and these oil flows to the air oil contained in the cavity S. Block contamination. Therefore, the suction of air from the oil pump 6 is prevented, and problems such as fluctuations in the discharge pressure of the oil pump 6 and generation of noise do not occur. As shown in FIG. 2, the oil is biased toward the front of the vehicle even when the vehicle descends, but if the openable suction port 13 is opened in this case as well, the air to the oil pump 6 can be supplied for the same reason as described above. Inhalation is prevented.

Further, when the vehicle is traveling at a constant speed or accelerating, the opening / closing suction port 13 is closed as shown in FIG. 3 (in FIG. 3, the state in which the opening / closing suction port 13 is closed is shaded. Is displayed).

When the vehicle accelerates, the oil L stored in the oil pan 4 moves to the rear of the vehicle (to the right in FIG. 3) due to inertia as shown in FIG. 3, and is biased to the rear of the vehicle. The openable suction port 13 is closed. When the oil L is biased toward the rear of the vehicle, the oil level forms a slope as shown in FIG. 3, so that a cavity S is formed in the front portion of the strainer body 5A of the oil strainer 5 in the vehicle front-rear direction.

However, in the present embodiment, since the open / close suction port 13 is closed as shown in FIG. 3 when the vehicle is accelerating, it is sucked from the suction port 9 in the strainer main body 5A as shown by an arrow in FIG. A large amount of oil flows toward the discharge port 7, and this oil flow blocks the air contained in the cavity S from being mixed into the oil. Therefore, the suction of air from the oil pump 6 is prevented, and problems such as fluctuations in the discharge pressure of the oil pump 6 and generation of noise do not occur. As shown in FIG. 3, the oil is biased to the rear of the vehicle even when the vehicle is climbing a slope. In this case as well, if the openable suction port 13 is closed, air is sucked into the oil pump 6 for the same reason as described above. Is prevented.

By the way, the opening / closing type suction port 13 may be performed based on the acceleration / deceleration detected by an acceleration sensor (not shown) provided in the vehicle, for example. Specifically, when the acceleration sensor detects the deceleration of the vehicle, the opening / closing suction port 13 may be opened as shown in FIG. 2, and the opening / closing suction port 13 may be closed as shown in FIG. ..

As described above, also in the present embodiment, since the above effect can be obtained by a simple configuration in which the oil strainer 5 is provided with the opening / closing suction port 13, the structure of the oil strainer 5 may be complicated and the cost may be increased. do not have.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of claims and the technical ideas described in the specification and drawings.

1 Power transmission device for vehicles
2 Input shaft 3 Case 4 Oil pan 5 Oil strainer 5A Strainer body 6 Oil pump 7 Strainer body discharge port 8 Nozzle 9 Strainer body suction port 10 Oil outlet 11 Pipe 12 Oil cooler 13 Openable suction port S Cavity

Claims (4)

A filter is housed inside a closed container-shaped strainer body installed at the bottom of the case of the vehicle power transmission device, and the strainer body has a suction port opened in the oil pan of the vehicle power transmission device. An oil strainer for a vehicle that forms a discharge port connected to an oil pump, filters the oil sucked into the strainer body from the suction port by the drive of the oil pump by the filter, and sends the oil from the discharge port to the oil pump. In
An oil strainer for a vehicle power transmission device, which is configured to supply excess oil flowing out from an oil outlet that opens above the strainer body to the upper space in the rear part of the strainer body in the front-rear direction of the vehicle. .. The oil strainer for a vehicle power transmission device according to claim 1, wherein the oil outlet and an oil supply port opened on the upper surface of the rear portion of the strainer body in the front-rear direction of the vehicle are connected by a pipe. A filter is housed inside a closed container-shaped strainer body installed at the bottom of the case of the vehicle power transmission device, and the strainer body has a suction port opened in the oil pan of the vehicle power transmission device. An oil strainer for a vehicle that forms a discharge port connected to an oil pump, filters the oil sucked into the strainer body from the suction port by the drive of the oil pump by the filter, and sends the oil from the discharge port to the oil pump. In
The discharge port is formed in the front part of the strainer body in the vehicle front-rear direction, and the opening / closing type suction port is formed in the rear part of the strainer body in the vehicle front-rear direction, which opens when the vehicle decelerates and closes otherwise.
An oil strainer for a power transmission device for a vehicle, characterized in that an acceleration sensor provided in the vehicle is configured to open the openable suction port when the deceleration of the vehicle is detected . The oil strainer for a vehicle power transmission device according to claim 3, wherein the suction port is formed at the bottom of an intermediate portion in the vehicle front-rear direction of the strainer body .

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