JP3296283B2 - Automatic transmission oil suction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil suction device for an automatic transmission for sucking oil filled in a transmission case formed by a transmission case and an oil pan from an oil strainer.

[0002]

2. Description of the Related Art As an oil suction device for an automatic transmission,
For example, there is one described in JP-A-6-323120. This is to provide a box-shaped valve that opens at the suction part of the oil strainer in accordance with the longitudinal movement of the vehicle, in order to prevent the intake of air that occurs when the oil is biased in the longitudinal direction due to sudden acceleration or sudden deceleration of the vehicle. It is a device that sucks oil by opening a box-shaped valve on the side where oil flows. That is, the prior art disclosed in the above-mentioned publication is a technique for preventing air from being sucked in due to the offset of oil in the front-rear direction.

[0003]

However, in the above-described conventional oil suction device, when the oil temperature decreases due to a decrease in outside air temperature or the like, the viscosity (viscosity resistance) of the oil increases. There is a problem that the oil to be sucked into the strainer stays and air is sucked together with the oil.

[0004] FIG. 12 is a diagram illustrating the oil level at the time of oil suction, which is divided into a case where the viscosity resistance of the oil is small and a case where the viscosity resistance is large (at a very low temperature). When inhaling oil with low viscous resistance, the oil level Lo
Decreases from the oil level Lo1 to the oil level Lo2 almost constantly, as shown in FIG. On the other hand, when inhaling oil having large viscous resistance, the oil level Lo
As shown in FIG. 2B, the air may drop greatly around the oil strainer 4 and suck air. In this case, there is a disadvantage that an oil pump (not shown) for discharging the oil sucked by the oil strainer 4 does not generate a predetermined suction negative pressure.

In order to prevent air from being sucked in when the viscous resistance of the oil is large, it is conceivable to arrange a flat plate near the oil level when the engine with a relatively high viscous resistance is stopped. If the oil level decreases after starting, a gap is created between the flat plate and the oil level, so that air is sucked in when oil is sucked, as in the related art. On the other hand, it is conceivable to place a flat plate in the oil when the engine is stopped.However, in the case of oil with large viscous resistance, the oil flow resistance increases when the distance from the flat plate to the bottom of the oil pan decreases. Therefore, the fluidity of the oil deteriorates, and it becomes difficult to obtain sufficient oil to be sucked into the oil strainer 4.

Further, for example, when the outer peripheral edge of the flat plate has a size that hardly causes a gap with respect to the inner wall of the transmission case, that is, the flat plate has an area substantially equal to the inner area of the transmission case. Since it is difficult for the oil to return from the upper portion, it is difficult to obtain a predetermined oil amount balance. In addition, if the area of the flat plate is too large, the contact area between the oil and the flat plate increases, which causes a disadvantage that the oil flow resistance at the time of oil suction increases.

SUMMARY OF THE INVENTION The problem to be solved by the present invention has been made in view of the above facts, and is a plane which can be moved in accordance with an oil level in a transmission case formed by a transmission cover and an oil pan. By providing a plate and forming a predetermined gap with respect to the inner wall of the transmission case around the entire outer peripheral edge of the flat plate or a part thereof, the oil in the transmission case is in a state of high viscous resistance. However, it is also necessary to ensure that a sufficient amount of oil is to be sucked into the oil strainer and prevent air from being sucked when the oil is sucked.

[0008]

According to a first aspect of the present invention, there is provided an oil transmission device for an automatic transmission according to the present invention.
A control valve is housed near a mating surface in a transmission case formed by a transmission cover and an oil pan, and oil filled in the transmission case is supplied from an intake port of an oil strainer provided below the control valve. In an automatic transmission oil suction device that sucks in,
At least one flat plate movable in accordance with the oil level of the oil in a state where the periphery of the oil strainer is closed is provided, and a longitudinal dimension L1 from a closed position around the oil strainer to the outer peripheral edge of the flat plate is provided. Is greater than the depth dimension L2 from the oil level during warm air idling to the suction port of the oil strainer, and is predetermined on the entire outer peripheral edge of the flat plate with respect to the inner wall of the transmission case or a part thereof. Is formed.

According to a second aspect of the present invention, there is provided an oil suction device for an automatic transmission according to the first aspect, wherein the flat plate is made of a material having a lower density than the oil. .

According to a third aspect of the present invention, there is provided an oil suction device for an automatic transmission according to the first aspect, wherein the flat plate has a shape in which the inside of the flat plate is hollow. It is.

According to a fourth aspect of the present invention, there is provided an oil suction device for an automatic transmission according to the first aspect, wherein the flat plate includes a driving device for moving the flat plate to a predetermined oil level. It is characterized by the following.

According to a fifth aspect of the present invention, in the oil suction device for an automatic transmission according to the fourth aspect, the driving device determines the moving amount of the flat plate from a predetermined time measured from the start of the engine. And a device for moving the flat plate to a predetermined oil level. The oil suction device for an automatic transmission according to claim 6, which is the present invention, accommodates a control valve near a mating surface in a transmission case formed by a transmission cover and an oil pan, In an oil suction device of an automatic transmission for sucking oil filled in the transmission case from an intake port of an oil strainer provided below, the oil suction device according to the oil level of the oil in a state where the periphery of the oil strainer is closed. At least one movable flat plate is provided, and a predetermined gap is formed all around the outer peripheral edge of the flat plate with respect to the inner wall of the transmission case or a part thereof. Determine the amount of movement of the flat plate from a predetermined time measured from, and move the flat plate to a predetermined oil level It is characterized in that it comprises a driving device.

According to a seventh aspect of the present invention, in the oil suction device for an automatic transmission according to the fifth or sixth aspect, the engine is started when the detected engine speed exceeds a predetermined speed. It is characterized by being determined.

According to the present invention, in the oil suction device for an automatic transmission according to the present invention, the driving device may be arranged such that the driving device moves the flat plate to a predetermined oil level by a hydraulic pressure supplied from a control valve. The device is characterized in that it is a device for moving to Also according to the present invention,
10. An oil suction device for an automatic transmission according to claim 9, wherein a control valve is housed near a mating surface in a transmission case formed by a transmission cover and an oil pan, and an oil strainer is provided below the control valve. An oil suction device for an automatic transmission for sucking oil filled in the transmission case from an inlet port of the automatic transmission, wherein at least one of the oil suction devices is movable in accordance with an oil level of the oil in a state in which the oil strainer is closed. A flat plate is provided, and a predetermined gap is formed on the entire outer peripheral edge of the flat plate with respect to the inner wall of the transmission case or a part thereof, and the flat plate is further controlled by hydraulic pressure supplied from a control valve. A driving device for moving the flat plate to a predetermined oil level is provided.

According to a tenth aspect of the present invention, there is provided an oil suction device for an automatic transmission according to the eighth or ninth aspect.
The driving device has an elastic body for returning the flat plate to an initial position.

The oil suction device for an automatic transmission according to claim 11, which is an invention, according to any one of claims 1 to 10, wherein a peripheral position of the flat plate is changed from a closed position around the oil strainer. The longitudinal dimension L1 is set equal to the depth dimension L2 from the oil level during warm-up idling to the inlet of the oil strainer.

According to a twelfth aspect of the present invention, there is provided the oil suction device for an automatic transmission according to any one of the first to eleventh aspects, wherein at least one of the flat plates in the vertical direction is provided with the flat plate. It is characterized in that a stopper for regulating the amount of movement is provided.

According to a thirteenth aspect of the present invention, in the oil suction device for an automatic transmission according to the twelfth aspect, the stopper has an elastic body on a contact surface with the flat plate. It is.

According to a twelfth aspect of the present invention, there is provided the oil suction device for an automatic transmission according to the twelfth or thirteenth aspect, wherein the stopper is set at the highest oil level when the engine is stopped, and when the engine is idling during warm-up. Is provided as the lowest level.

According to a fifteenth aspect of the present invention, there is provided an oil transmission device for an automatic transmission according to any one of the first to fourteenth aspects, wherein the upper side surface of the flat plate is formed by an outer peripheral edge of the flat plate. It is characterized in that the inclined surface has the smallest thickness.

[0021]

Thus, the oil suction device for an automatic transmission according to the first aspect of the present invention has a longitudinal dimension L.
Since at least one flat plate whose depth is equal to or greater than the depth dimension L2 moves in accordance with the oil level with the periphery of the oil strainer closed, even if the oil has a high viscous resistance, the inlet of the oil strainer No air is sucked in when inhaling oil from Further, the flat plate returns the oil above the flat plate to the oil pan by forming a predetermined gap with respect to the transmission case around the entire outer peripheral edge of the flat plate or a part thereof. A sufficient amount of oil to be sucked into the oil strainer can be secured without preventing circulation.

Therefore, according to the present invention, even when the oil in the transmission case has a large viscous resistance, it is possible to secure a sufficient amount of oil to be sucked into the oil strainer while sucking the oil. Inhalation of generated air can be prevented.

In the oil suction device for an automatic transmission according to the second aspect of the present invention, the flat plate is made of a material having a density lower than that of the oil in the transmission case. The plane plate is positioned by buoyancy. Therefore, it is easy to adjust the flat plate to the oil level.

According to a third aspect of the present invention, there is provided an oil suction device for an automatic transmission according to the first aspect, wherein the flat plate has a shape in which the inside of the flat plate is hollow. Positioned by buoyancy. Therefore, even if the flat plate is made of a material having a higher density than the oil in the transmission case, it is easy to adjust the flat plate to the oil level.

According to a fourth aspect of the present invention, in the oil suction device for an automatic transmission according to the first aspect, the flat plate is moved to a predetermined oil level by a driving device. There is no need for material selection or processing to obtain large buoyancy.

The oil suction device for an automatic transmission according to claim 5 or 6, wherein the drive unit determines the amount of movement of the flat plate from a predetermined time measured from the start of the engine. Move plate to predetermined oil level. Therefore, since the movement of the flat plate is determined by a predetermined time measured from the start of the engine, the positioning of the flat plate is easy.

According to a seventh aspect of the present invention, in the oil suction device for an automatic transmission according to the fifth or sixth aspect, the engine is started when the detected engine speed exceeds a predetermined engine speed. Since the determination is made, the flat plate moves faster than the oil level lowers, so that the flat plate does not sink into the oil having a large viscous resistance to increase the oil flow resistance.

In the oil suction device for an automatic transmission according to the present invention, the driving device moves the flat plate to a predetermined oil level by hydraulic pressure supplied from a control valve. . Therefore, since the movement of the flat plate is determined by the hydraulic pressure supplied from the control valve, the positioning of the flat plate is easy.

According to a tenth aspect of the present invention, there is provided the oil suction device for an automatic transmission according to the eighth or ninth aspect.
Since the driving device has an elastic body for returning the flat plate to the initial position, when the hydraulic pressure supplied from the control valve is stopped due to the stop of the engine, the flat plate returns to the initial position by the elastic force. Therefore, the initial setting of the flat plate can be easily performed.

The oil suction device for an automatic transmission according to claim 11, which is an invention, according to any one of claims 1 to 10, wherein the outer peripheral edge is located from a closed position around the oil strainer on the flat plate. Is made equal to the depth L2 from the oil level during warm-up idling to the inlet of the oil strainer. In this case, the size of the flat plate is minimized, which is advantageous in layout. In addition, the oil flow resistance can be minimized together with the flat plate, so that oil can be efficiently returned while preventing air from being sucked.

According to a twelfth aspect of the present invention, in the oil suction device for an automatic transmission according to any one of the first to eleventh aspects, the stopper provided on at least one of the upper and lower sides of the flat plate is provided. Since the amount of movement of the flat plate is regulated, malfunction of the flat plate and dropping of the flat plate can be prevented.

In the oil suction device for an automatic transmission according to the present invention, in the twelfth aspect, since the stopper has an elastic body on a contact surface with the flat plate, the flat plate is protected. It is effective for

According to a fourteenth aspect of the present invention, there is provided the oil suction device for an automatic transmission according to the twelfth or thirteenth aspect, wherein the stopper is set at the highest oil level when the engine is stopped, and when the engine is idling during warm-up. Since the oil level is provided at the lowest level, it is effective in preventing malfunction and dropout described in claim 10.

According to a fifteenth aspect of the present invention, there is provided the oil suction device for an automatic transmission according to any one of the first to fourteenth aspects, wherein an upper peripheral surface of the flat plate is formed by an outer peripheral edge of the flat plate. Since the inclined surface has the smallest thickness, oil hardly accumulates on the upper surface of the flat plate, and the oil on the flat plate is formed between the outer peripheral edge of the flat plate and the inner wall of the transmission case. Guided to the gap. Therefore, the oil in the upper portion of the flat plate can be efficiently returned to the oil pan, which is effective in securing a sufficient amount of oil to be sucked into the oil strainer.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an oil suction device for an automatic transmission according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing a power train of an FR (front-engine rear-wheel drive) vehicle incorporating an oil suction device for an automatic transmission according to the present invention.
Is output to a propeller shaft 50 via an automatic transmission 40 having a torque converter (not shown).

2 to 4 show a first embodiment of an oil suction device for an automatic transmission according to the present invention. FIG. 2 is a cross-sectional view of a main part of the automatic transmission 40 viewed from a side, and FIG. FIG. 4 is a plan view showing the inside of FIG. 1 from below B (see FIG. 1).

As shown in FIGS. 2 to 4, the automatic transmission 40 forms a transmission case with a transmission cover 41 and an oil pan 42 that are integrated with or separate from the torque converter housing. Transmission mechanism 6
The control valve unit 5 for supplying the hydraulic pressure for controlling the pressure is stored. Behind the control valve unit 5, a center housing gear 7 that accommodates a gear (not shown) that transmits power from the transmission mechanism section 6 to the propeller shaft 50 is disposed.

The transmission case is filled with oil, and reference numeral Lo indicates the oil level of the oil filled in the transmission case. This oil is sucked by an oil pump (not shown) from an inlet 4a (see FIGS. 3 and 4) of an oil strainer 4 provided below the control valve unit 5.

The guide 8 formed between the control valve unit 5 and the oil strainer 4 is provided with a first flat plate 1a which can be moved in accordance with the oil level Lo with the periphery of the oil strainer 4 closed. Have been. The first flat plate 1a is made of a material having a lower density than the oil in the transmission case.
Can be positioned at the same position as the oil level Lo by buoyancy. As shown in FIG. 4, the outer peripheral shape of the first flat plate 1a is set such that the entire outer peripheral edge of the flat plate 1a has a predetermined gap with respect to the inner wall of the transmission case.

Further, in this embodiment, the second flat plate 1b which can be moved in accordance with a high oil level which cannot be tolerated by the first flat plate 1a is connected to the center housing gear 7.
And one outer peripheral edge of the second flat plate 1b is arranged so as to overlap the outer peripheral edge of the first flat plate 1a (see FIGS. 2 and 4). Second flat plate 1
b is made of a material having a lower density than the oil in the transmission case, and the second flat plate 1b can be positioned at the same position as the hydraulic pressure level Lo by buoyancy. As shown in FIG. 4, the outer peripheral shape of the second flat plate 1b is set so that the entire outer peripheral edge of the flat plate 1b has a predetermined gap with the inner wall of the transmission case.

Next, the operation of the first embodiment will be described with reference to FIGS. However, in order to easily understand the description, it is assumed that the engine 30 is stopped in a place where the outside air temperature is low and the oil filled in the transmission is in a very low temperature state, that is, a state in which the viscous resistance is large.

When the engine 30 is stopped, the oil level Lo of the oil filled in the transmission case is at the highest level. However, as the engine is started, a torque converter or the transmission mechanism 6 (not shown) is started. Oil strainer 4 to generate the required hydraulic pressure for control pressure and lubricating oil
The oil is sucked through the suction port 4a. At this time, the oil level Lo starts to decrease, but the second flat plate 1b also moves in accordance with the oil level Lo.

When the oil level Lo further decreases by suction from the oil strainer 4, the second flat plate 1b
Is in contact with the first flat plate 1a, and the first and second flat plates 1a and 1b move integrally with the oil level Lo.

At this time, since the flat plates 1a and 1b exist between the oil level Lo and the oil strainer 4, the oil in the transmission case is removed from the oil strainer 4 as described with reference to FIG. Since there is no large drop around, and there is a sufficient distance from the oil level directly receiving the atmospheric pressure to the inlet 4a of the oil strainer,
No air is sucked in when inhaling oil.

Thereafter, the first and second flat plates 1
a, 1b move in accordance with the oil level Lo, and when the oil level Lo rises with the oil temperature, the flat plates 1a, 1b also move.
1b rises in accordance with the oil level Lo. For this reason,
Even if the engine 30 is started again in a very low temperature state having a large viscous resistance, the engine 30 is not sunk into the oil, so that the oil passing resistance at the time of oil suction does not increase.

The first and second flat plates 1a, 1a
1b returns the oil above the flat plates 1a, 1b to the oil pan 42 by forming a predetermined gap with respect to the transmission case around the entire outer peripheral edges of the flat plates 1a, 1b. Without obstruction, a sufficient amount of oil to be sucked into the oil strainer 4 can be secured. Further, by adjusting the gap to reduce the size of the first and second flat plates 1a and 1b as much as possible, the contact area between the oil and the flat plate is reduced, and the rise in the oil flow resistance is minimized. As a result, the fluidity of the oil is not deteriorated.

The gap is not limited to the entire outer peripheral edge of the flat plates 1a and 1b with respect to the inner wall of the transmission case. Effects can be obtained.

Thus, in the first embodiment according to the present invention, the two flat plates 1a and 1b move in accordance with the oil level Lo while the periphery of the oil strainer 4 is closed, so that the oil has a large viscous resistance. Even in the state, when the oil is sucked from the suction port 4a of the oil strainer 4, no air is sucked. Also, the flat plates 1a, 1b
Is to return the oil above the flat plates 1a, 1b to the oil pan 42 by forming a predetermined gap with respect to the transmission case around the entire outer peripheral edges of the flat plates 1a, 1b or a part thereof. Thus, a sufficient amount of oil to be sucked into the oil strainer 4 can be secured.

Therefore, according to the present embodiment, even if the oil in the transmission case has a large viscous resistance, the oil is sucked while ensuring a sufficient oil amount to be sucked into the oil strainer 4. Inhalation of air generated at the time can be prevented.

In this embodiment, the first and second flat plates 1a and 1b are made of a material having a density lower than that of the oil in the transmission case.
a and 1b are positioned by buoyancy. Therefore, it is easy to adjust the first and second flat plates 1a and 1b to the oil level Lo.

FIG. 5 refers to the power train of FIG.
FIG. 4 is a front sectional view of a second embodiment of the oil suction device for an automatic transmission according to the present invention, and a transmission mechanism 6 (not shown) is disposed above a control valve unit 5. In this embodiment, on a side surface of the control valve unit 5, a flat plate 1 that is movable in accordance with an oil level while the periphery of the oil strainer 4 is closed is provided. Stoppers 9a and 9b for regulating the movement of the flat plate 1 are provided.

Here, the operation of the second embodiment will be described with reference to FIGS. However, in order to easily understand the description, it is assumed that the engine 30 is stopped in a place where the outside air temperature is low, and the oil filled in the transmission is in a state of large viscous resistance.

When the engine 30 is stopped, the oil level Lo in the transmission case is at the highest level. However, as the engine 30 is started, the control pressure applied to the torque converter or the transmission mechanism 6 (not shown) is increased. Oil is sucked from the suction port 4a of the oil strainer 4 to generate oil pressure required for lubricating oil and the like. At this time, the oil level Lo starts to decrease, but the flat plate 1 also moves in accordance with the oil level Lo.

At this time, similarly to the first embodiment, since the flat plate 1 exists between the oil level Lo and the oil strainer 4, as described with reference to FIG.
The oil in the transmission case does not drop greatly around the oil strainer 4 and there is a sufficient distance from the oil surface directly receiving atmospheric pressure to the intake port 4a of the oil strainer. Does not breathe air.

Thereafter, the flat plate 1 is moved to the oil level Lo.
When the oil level Lo rises with the oil temperature, the flat plate 1 also rises in accordance with the oil level Lo. For this reason, even if the engine 30 is started again in a cryogenic state, the engine 30 will not be sunk into the oil,
Does not increase oil flow resistance when inhaling oil.

As in the first embodiment, a predetermined gap is formed around the outer peripheral edge or a part of the outer peripheral edge with respect to the transmission case, so that the oil above the flat plate 1 can be removed. Since the oil is returned to the oil pan 42, a sufficient amount of oil to be sucked into the oil strainer 4 can be secured without obstructing the oil circulation. At this time, as in the first embodiment, by adjusting the gap to reduce the size of the flat plate 1 as much as possible, the contact area between the oil and the flat plate is reduced, and the oil passage resistance is reduced. Since the rise can be minimized, the fluidity of the oil is not deteriorated.

In this embodiment, the stoppers 9 are provided in the vertical direction of the flat plate 1, but it is preferable that these stoppers 9a and 9b have an elastic body on the contact surface with the flat plate 1. This elastic body is effective for protecting the flat plate 1. The stoppers 9a and 9b restrict the movement of the flat plate 1 and thus prevent the flat plate 1 from malfunctioning and falling off. In particular, it is preferable that the stopper 9 be provided with the oil level when the engine is stopped as the highest level (position of the stopper 9a) and the oil level during warm-up idling as the lowest level (position of the stopper 9b). In this case, it is effective to prevent the above-mentioned malfunction or dropout. The stopper 9 may be provided on at least one of the upper and lower sides of the flat plate 1, and the stopper 9 may be employed in the first embodiment.

As in the first embodiment, the flat plate 1 may be made of a material having a lower density than the oil in the transmission case. The same effect can be obtained by performing the processing described later.

FIG. 6 shows another embodiment of the flat plate. The flat plate 2 has a shape in which the inside of the flat plate 2 is hollow 2a. In this case, even if the flat plate 2 is made of a material having a higher density than the oil in the transmission case, the flat plate 2 is positioned by buoyancy. Therefore, according to the flat plate 2 according to the present embodiment, it is easy to adjust the flat plate 2 to the oil level Lo regardless of the material of the flat plate.

FIG. 7 is a sectional view showing a third embodiment of the present invention including a driving device for moving the flat plate 1 to a predetermined oil level. In the drive device 10, the stopper 9 is eliminated, and the drive control device 11 determines the movement amount of the flat plate 1 from a predetermined time measured from the engine start by using the engine rotation sensor 12 and the time measuring device 13,
The flat plate 1 is moved to a predetermined oil level by operating the plate driving device 14.

Hereinafter, the third embodiment will be described with reference to FIGS.
This will be described in detail with reference to the flowchart of FIG. However, in order to easily understand the description, it is assumed that the engine 30 is stopped in a place where the outside air temperature is low, and the oil filled in the transmission is in a state of large viscous resistance.

The oil in the transmission is in a state of high viscous resistance, and when the ignition key for starting the engine 30 is turned on, the flat plate 1 is started to be lowered, so that the flat plate 1 lowers the oil level Lo. Since it moves faster than this, it sinks into oil having large viscous resistance and increases oil flow resistance.

Therefore, in this embodiment, the engine speed Ne is detected, and the engine speed Ne is changed to a predetermined speed Ni.
When it becomes higher than this, it is determined that the engine has started, and the flat plate 1 is moved.

The drive control unit 11 determines in step 60 in FIG.
When the engine 30 starts operating, the engine speed Ne detected by the engine speed sensor 12 is compared with a predetermined idle speed Ni set in advance, and the detected engine speed Ne is set in advance. It is determined that the engine 30 has started when the idling rotational speed Ni becomes higher than the idle rotational speed Ni.

If it is determined in step 60 that the engine 30 has been started, the routine proceeds to step 61, where the program proceeds to step 61.
Controls the plate driving device 14 to move the flat plate 1 to the oil pan 42 side. In step 62, the time measurement unit 13 starts measuring time together with the movement of the flat plate 1. In step 63, the measurement time T
Is determined to be a predetermined time To set in advance, and the movement of the flat plate 1 is continued until the measured time T reaches the predetermined time To. When the measurement time T reaches the predetermined time To in step 63, the process proceeds to step 64, in which the movement of the flat plate 1 is stopped.

The predetermined time To depends on the configuration of the automatic transmission, but should be set to the time from when the oil pump generates the maximum negative pressure until the absolute value of the negative pressure decreases and starts to reach a stable negative pressure. Is good.

In step 65, the engine rotation sensor 1
It is determined whether or not the engine speed Ne detected from Step 2 is 0. If the engine speed Ne is 0, it is determined that the engine 30 has stopped. If it is determined that the engine 30 has stopped, the process proceeds to step 66, and the process proceeds to step 66.
At step 6, the plate driving device 14 is operated to return the flat plate 1 from the position stopped at step 64 to the initial position, that is, the oil level when the engine is stopped.

In step 64, the flat plate 1 is stopped at a predetermined oil level, and the stopped state of the flat plate 1 is maintained until the engine 30 stops.
Even if the oil temperature rises while driving the oil pressure 0 and the flat plate 1 sinks into the oil, the viscosity resistance of the oil decreases as the oil temperature rises, so that the oil flow resistance during oil suction increases. There is no problem.

FIG. 9 is a sectional view showing a fourth embodiment of the present invention including another driving device for moving the flat plate 1 to a predetermined oil level. This drive device 20
Has a plate driving device 21 for accommodating a piston 22 for moving the flat plate 1 by hydraulic pressure supplied from the control valve unit 5.
Is biased toward the device 20 by the contraction force of the elastic spring 23. Note that a transmission mechanism 6 (not shown) is disposed above the control valve unit 5.

Hereinafter, the fourth embodiment will be described in detail with reference to FIGS. However, in order to easily understand the description, it is assumed that the engine 30 is stopped in a place where the outside air temperature is low, and the oil filled in the transmission is in a state of large viscous resistance.

When the engine 30 starts, a part of the hydraulic pressure supplied to the control valve unit 5
is supplied to the plate driving device 21 via a. On this occasion,
The piston 22 of the plate driving device 21 opposes the elastic force of the spring 23 by the oil pressure from the oil passage 21a,
The flat plate 1 is also moved to the oil pan 42 to move to the second side.
Move to the side. The movement of the flat plate 1 is performed by the piston 22
Is stopped by contacting the inner wall of the plate driving device 21 with a part thereof, and stops at a predetermined oil level.
However, the stroke amount of the piston 22 is determined by the structure of the automatic transmission, and is preferably set to be equal to the movement amount (decrease amount) of the oil level Lo.

The flat plate 1 is moved to a predetermined oil level by the oil pressure from the control valve unit 5. However, while the engine 30 is driven, the oil temperature rises and the flat plate 1 Even if it sinks, the viscous resistance of the oil decreases with an increase in the oil temperature, so there is no problem that the oil flow resistance at the time of oil suction increases.

When the engine 30 is stopped, the hydraulic pressure supplied from the control valve unit 5 to the plate driving device 21 is stagnant. The piston 22 receives the contraction force of the spring 23, and the flat plate 1 is moved from the stop position to the initial position. That is, it returns to the oil level when the engine is stopped.
Therefore, initial setting of the flat plate 1 can be easily performed.

The drive units 10 and 20 described in the third and fourth embodiments respectively move the flat plate 1 so that the oil level when the engine is stopped is the highest level, and the oil level when the engine is warmed up is idling. It is preferable to control so as to regulate the level as the lowest. In this case, it is effective to prevent the malfunction of the flat plate 1 and the falling off of the flat plate 1. In the third and fourth embodiments,
Since the driving devices 10 and 20 are provided, it is not necessary to select the material of the flat plate 1 in consideration of the oil density.

In any one of the first to fourth embodiments, the dimensions of the flat plate and the oil strainer 4
As shown in FIG. 10 in which the flat plate 1 is taken as an example, the longitudinal dimension L1 from the closed position around the oil strainer 4 to the outer peripheral edge of the flat plate is determined by the warm-up idling. It is preferable to make the depth L2 equal to the depth L2 from the oil level at the time to the inlet of the oil strainer. In this case, the plane plate 1 has a minimum necessary size, which is advantageous in layout. In addition, the oil flow resistance can be minimized together with the flat plate 1, so that oil can be efficiently returned while preventing air from being sucked.

In any one of the first to fourth embodiments, the shape of the flat plate is as shown in FIG.
It is preferable that the upper side surface 3f of the flat plate 3 be an inclined surface at which the outer peripheral edge 3e of the flat plate 3 has the smallest thickness. In this case, oil hardly accumulates on the upper side surface 3f of the flat plate 3, and the oil on the flat plate 3 is guided to the gap formed between the outer peripheral edge 3e of the flat plate 3 and the inner wall of the transmission case. . Therefore, the oil in the upper portion of the flat plate 3 can be efficiently returned to the oil pan 42, and this is effective in securing a sufficient amount of oil to be sucked into the oil strainer 4.

As described above, the oil suction device for an automatic transmission according to the present invention has an oil level in a state where at least one flat plate is closed around the oil strainer, as is clear from the description of the first to fourth embodiments. Since they move together, even when the oil has a high viscous resistance, no air is sucked in when the oil is sucked from the inlet of the oil strainer. Further, the flat plate returns the oil above the flat plate to the oil pan by forming a predetermined gap with respect to the transmission case around the entire outer peripheral edge of the flat plate or a part thereof. A sufficient amount of oil to be sucked into the oil strainer can be secured without preventing circulation.

Therefore, according to the present invention, even when the oil in the transmission case is in a state of high viscous resistance, a sufficient amount of oil to be sucked into the oil strainer is secured while the oil is sucked. Inhalation of generated air can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a power train of an FR vehicle incorporating an oil suction device for an automatic transmission according to the present invention.

FIG. 2 is a cross-sectional view of a main part for describing a first embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a plan view showing the inside of FIG.

FIG. 5 is a cross-sectional view of a main part showing a second embodiment of the present invention from the front.

FIG. 6 is a schematic view illustrating another embodiment of the flat plate.

FIG. 7 is a cross-sectional view of a main part showing a third embodiment of the present invention from the front.

FIG. 8 is a flowchart illustrating a third embodiment.

FIG. 9 is a cross-sectional view of a main part showing a fourth embodiment of the present invention from the front.

FIG. 10 is a diagram illustrating a preferred dimensional relationship between a flat plate and an oil strainer inlet;

FIG. 11 is a diagram illustrating a preferred shape of a flat plate.

FIG. 12 is a diagram exemplifying an oil level at the time of oil suction when the viscous resistance of the oil is small and when the viscous resistance is large.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 flat plate 2 flat plate (hollow) 3 flat plate (inclined) 4 oil strainer 4 a suction port 5 control valve unit 6 transmission mechanism 7 center housing gear 8 guide 9 stopper 10 drive device 11 drive control device 12 engine rotation sensor 13 hours Measuring instrument 14 Plate drive 20 Drive 21 Plate drive 21a Oil passage 22 Piston 23 Spring 30 Engine 40 Automatic transmission 41 Transmission cover 42 Oil pan 50 Propeller shaft Lo Oil level

Claims (15)

(57) [Claims] A control valve is housed near a mating surface in a transmission case formed by a transmission cover and an oil pan, and is inserted into the transmission case from an intake port of an oil strainer provided below the control valve. An oil suction device for an automatic transmission for sucking filled oil, wherein at least one flat plate movable in accordance with an oil level of the oil is provided in a state where the oil strainer is closed, and the oil in the flat plate is provided. A longitudinal dimension (L1) from the closed position around the strainer to the outer peripheral edge is set to be equal to or greater than a depth dimension (L2) from an oil level during warm-up idling to an intake port of the oil strainer; A predetermined gap is formed around the entire outer peripheral edge of the flat plate or a part thereof with respect to the inner wall of the flat plate Oil suction system of an automatic transmission, wherein the door. 2. The oil suction device for an automatic transmission according to claim 1, wherein the flat plate is made of a material having a density lower than that of the oil. 3. The oil suction device for an automatic transmission according to claim 1, wherein the flat plate has a shape in which the inside of the flat plate is hollow. 4. The oil suction device for an automatic transmission according to claim 1, wherein the flat plate includes a driving device for moving the flat plate to a predetermined oil level. 5. The apparatus according to claim 4, wherein the driving device is a device that determines a moving amount of the flat plate from a predetermined time measured from an engine start and moves the flat plate to a predetermined oil level. Characteristic oil transmission device for automatic transmission. 6. A control valve is housed near a mating surface in a transmission case formed by a transmission cover and an oil pan, and is inserted into the transmission case from an intake port of an oil strainer provided below the control valve. An oil suction device for an automatic transmission that sucks filled oil, wherein at least one flat plate that is movable in accordance with an oil level of the oil in a state where the oil strainer is closed is provided. A predetermined gap is formed on the entire outer peripheral edge of the flat plate with respect to the inner wall or a part thereof, and further, the flat plate determines a moving amount of the flat plate from a predetermined time measured from engine start, The automatic transmission according to claim 1, further comprising a driving device for moving the flat plate to a predetermined oil level. Inhaler. 7. The oil suction device for an automatic transmission according to claim 5, wherein the engine start is determined when the detected engine speed exceeds a predetermined speed. 8. The oil suction device for an automatic transmission according to claim 4, wherein the driving device is a device that moves the flat plate to a predetermined oil level by hydraulic pressure supplied from a control valve. . 9. A control valve is housed near a mating surface in a transmission case formed by a transmission cover and an oil pan, and is inserted into the transmission case from an intake port of an oil strainer provided below the control valve. An oil suction device for an automatic transmission for sucking filled oil, wherein at least one flat plate movable in accordance with an oil level of the oil in a state where the oil strainer is closed is provided. A predetermined gap is formed on the entire outer peripheral edge of the flat plate with respect to the inner wall or a part thereof, and further, the flat plate is brought to a predetermined oil level by hydraulic pressure supplied from a control valve. An oil suction device for an automatic transmission, comprising a driving device for moving. 10. The oil suction device for an automatic transmission according to claim 8, wherein the driving device has an elastic body for returning the flat plate to an initial position. 11. A longitudinal dimension L1 from a closed position around an oil strainer on the flat plate to the outer peripheral edge according to any one of claims 1 to 10,
An oil suction device for an automatic transmission, wherein a depth dimension L2 from an oil level during warm-up idling to an intake port of the oil strainer is equalized. 12. The automatic transmission according to claim 1, wherein a stopper for regulating a movement amount of the plane plate is provided on at least one of a vertical direction of the plane plate. Oil suction device. 13. The oil suction device for an automatic transmission according to claim 12, wherein the stopper has an elastic body on a contact surface with the flat plate. 14. The automatic transmission according to claim 12, wherein the stopper is provided with an oil level when the engine is stopped at the highest level and an oil level at the time of warm-up idling as the lowest level. Oil suction device. 15. The automatic transmission according to claim 1, wherein an upper peripheral surface of the flat plate is an inclined surface having a thinnest outer peripheral edge of the flat plate. Oil suction device.