JP2016151272A - Oil strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil strainer capable of restricting air lock at an oil pump at the time of starting driving of an oil pump.SOLUTION: An oil strainer 10 comprises: a screen 30 arranged in a housing 20 so as to define an inside part of the housing 20 into an area [a dirty side] at an inlet 24 side and an area [a clean side] at an outlet 23 side to catch foreign objects in oil; and frame-like rubber packings 40 arranged along an outer circumferential part of the screen 30 and between the screen 30 and the housing 20. The rubber packing 40 is formed to be foldable like a bellows. When driving of an oil pump 15 is stopped, the rubber packing extends by its own weight and weights of the screen 30 and a retainer 31. When the oil pump 15 is driven, the screen 30 attached to the retainer 31 is sucked together with oil by a suction force of the oil pump 15 to cause the rubber packing is shrunk.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an oil strainer that supplements foreign matter in oil sucked by an oil pump.

  For example, transmissions such as a stepped automatic transmission (AT) and a continuously variable transmission (CVT) have an oil pump that discharges high-pressure oil (ATF), and control the high-pressure oil discharged from this oil pump. By adjusting the pressure with a valve and supplying it to each part, functions such as shifting and forward / reverse switching are realized, and each part is lubricated. Here, since the control valve is vulnerable to the entry of foreign matter (contamination), an oil strainer that is a filtration device for removing foreign matter in oil is usually provided upstream of the oil pump.

  As such an oil strainer, Patent Literature 1 discloses an oil strainer that prevents intrusion of intake air from a pinching portion on the outer periphery of a filter. More specifically, this oil strainer has a strainer body having a suction port connected to the suction port of the oil pump, a strainer cover having an oil inlet, and a strainer body or a strainer cover, and the outer periphery thereof is pinched. The filter is provided with a seal member at the clamping portion of the filter.

JP-A-6-71116

  According to the oil strainer disclosed in Patent Document 1 described above, since the seal member is interposed in the pinching portion of the filter, intrusion of air from the pinching portion is prevented. By the way, during the operation of the transmission, the oil is agitated by the shaft parts of the transmission and the like, and tends to contain small bubbles. Here, some of the air bubbles enter the oil strainer through the oil strainer suction port. However, when the engine and transmission are stopped (ie, the oil pump is stopped), the oil flow into the oil strainer. Therefore, the bubbles cannot pass through the filter, accumulate on the dirty side (unfiltered side), and the bubbles may collect and grow into large bubbles.

  After that, when the oil pump is started by starting the engine, an oil flow is generated in the oil strainer, and large bubbles that have grown pass through the filter and flow into the clean side (filtration side). . When the large bubbles are sucked into the oil pump, the oil pump is engaged with air, and as a result, there is a possibility that abnormal noise is generated or the hydraulic pressure is reduced.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an oil strainer capable of suppressing air biting of the oil pump at the start of driving of the oil pump.

  An oil strainer according to the present invention is an oil strainer that is disposed on the upstream side of an oil pump and captures foreign matter in the oil sucked into the oil pump. A housing having an outlet, a filter medium disposed in the housing so as to divide the inside of the housing into an inlet side area and an outlet side area, and an outer peripheral portion of the filter medium; And a frame-like stretchable member provided between the filter medium and the housing, the stretchable member has oil resistance and stretchability, and when the oil pump is stopped, its own weight and The filter medium is extended by the weight of the filter medium, and when the oil pump is driven, the filter medium is contracted by being sucked together with the oil by the suction force of the oil pump.

  According to the oil strainer of the present invention, when the drive of the oil pump is stopped, the suction force by the oil pump is lost, the expansion member is extended by its own weight and the weight of the filter medium, and the filter medium is lowered to the bottom surface of the housing. For this reason, the growth of bubbles is hindered by reducing the area in which bubbles on the inlet side (unfiltered side) grow. As a result, it is possible to suppress the air biting of the oil pump at the start of driving of the oil pump. When the oil pump is being driven, the expansion member and the filter medium are sucked together with the oil by the suction force of the oil pump, and the expansion member contracts accordingly. Thereby, since the area | region of the inflow port side (unfiltered oil side) is expanded and the filtration area is ensured, oil filtration can be performed efficiently.

  In the oil strainer according to the present invention, it is preferable that the expandable member is made of an oil-resistant rubber material and is foldable into a bellows shape.

  In this way, when the drive of the oil pump is stopped, the expansion / contraction member formed in a bellows shape is extended by its own weight and the weight of the filter medium, so that the filter medium can be lowered to the bottom surface of the housing. On the other hand, when the oil pump is being driven, the expansion member and the filter medium are sucked together with the oil by the suction force of the oil pump, and the expansion member is folded in a bellows shape and contracted accordingly, thereby housing the filter medium. It becomes possible to raise from the bottom face of.

  The oil strainer according to the present invention regulates the distance between the filter medium and the bottom surface of the housing by restricting the expansion / contraction member from extending to the outlet side by the suction force of the oil pump when the oil pump is driven. It is preferable to further include a regulating member.

  In this way, when the oil pump is driven and the filter medium or the like is sucked to the outlet side by the suction force of the oil pump, the expansion member can be restricted from extending to the outlet side. It is possible to keep the distance between the housing and the bottom surface of the housing at an appropriate distance.

  In the oil strainer according to the present invention, it is preferable that the restriction member is provided on the outlet side of the expansion / contraction member so as to protrude toward the inside of the housing along the inner surface of the housing.

  In this way, when the filter medium or the like is sucked toward the outlet by the suction force of the oil pump, it is easy and easy for the elastic member to extend toward the outlet by the impact of the elastic member against the regulating member. It becomes possible to prevent reliably.

  The oil strainer according to the present invention preferably further includes an elastic member that is interposed between the regulating member and the expansion / contraction member and urges the expansion / contraction member in the extending direction.

  In this way, for example, even when the filter medium is difficult to descend, the filter medium can be quickly lowered to the bottom surface of the housing.

  According to the present invention, it is possible to suppress the air biting of the oil pump at the start of driving of the oil pump.

It is sectional drawing which shows the structure (state at the time of an oil pump drive) of the oil strainer which concerns on embodiment. It is the figure which expanded and showed the part enclosed by the rectangular frame in FIG. It is sectional drawing which shows the structure (state at the time of an oil pump non-drive) of the oil strainer which concerns on embodiment. It is the figure which expanded and showed the part enclosed by the rectangular frame in FIG. It is sectional drawing which shows the structure (state at the time of an oil pump non-drive) of the oil strainer which concerns on a modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts. Moreover, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

  First, the structure of the oil strainer 10 according to the embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a configuration of the oil strainer 10 (state when the oil pump is driven), and FIG. 2 is an enlarged view of a portion surrounded by a rectangular frame in FIG. (The figure which expanded and showed the state of the rubber packing 40, the screen 30, etc.). 3 is a cross-sectional view showing the configuration of the oil strainer 10 (state when the oil pump is not driven), and FIG. 4 is an enlarged view of a portion surrounded by a rectangular frame in FIG. FIG. 3 is an enlarged view showing the states of the rubber packing 40 and the screen 30 when the oil pump is not driven.

  The oil strainer 10 is disposed upstream of the oil pump 15 and supplements foreign matter (contamination) in the oil (ATF) sucked into the oil pump 15. The oil strainer 10 is disposed under a transmission such as a continuously variable transmission (CVT) or a stepped automatic transmission (AT) so as to be immersed in oil stored in an oil pan.

  The oil strainer 10 includes a housing (strainer body) 20 including an upper body 21 and a lower body 22 that are divided into upper and lower parts. An inlet 24 is formed on the lower surface of the lower body 22, and when the oil pump 15 is driven, oil before filtration is sucked into the oil strainer 10 (housing 20) through the inlet 24. The inflow port 24 is disposed so as to be immersed in the oil so as not to suck in air even if the oil in the oil pan is low or the liquid level is inclined due to centrifugal force during cornering. Has been.

  On the other hand, an outlet 23 is formed on the upper surface of the upper body 21. The outlet 23 is formed at a position offset from the inlet 24. The outlet 23 is communicated with the suction port of the oil pump 15, and when the oil pump 15 is driven, the oil filtered through the outlet 23 (with foreign matter removed) is supplied to the oil pump 15. The As the oil pump 15, for example, a trochoid pump, an internal gear pump, an external gear pump, a vane pump, or the like can be used. Moreover, as a drive system of the oil pump 15, for example, a mechanical system such as a chain drive system or a coaxial system, or an electric system can be employed.

  In the vicinity of the mating surface between the lower body 22 and the upper body 21, a screen 30 (corresponding to the filter medium described in the claims) supported by the retainer 31 is provided so as to partition the interior of the housing 20 up and down. That is, the screen 30 is divided into a region on the inlet 24 side (unfiltered oil side: dirty side) and a region on the outlet 23 side (filtered oil side: clean side). It is arranged in the inside.

  The screen 30 is a filter medium that captures foreign matter in oil. For example, a filter made of glass fiber, sponge, paper, or the like can be used in addition to a filter made of nonwoven fabric or metal. The retainer 31 is a member having oil resistance and strength, for example, formed in a lattice shape. The retainer 31 is formed of, for example, a metal or a resin (for example, engineering plastic) having a specific gravity greater than that of oil and having excellent oil resistance and temperature resistance. The screen 30 is used in a state where it is attached to the retainer 31.

  The screen 30 and the retainer 31 are attached to the inside of the housing 20 via a flexible and elastic rubber packing 40 (corresponding to the elastic member described in the claims). That is, a rubber packing 40 in a frame shape (in plan view) that connects the screen 30 and the retainer 31 and the housing 20 is attached along the outer peripheral portion (outer edge portion) of the screen 30 and the retainer 31. The rubber packing 40 is made of a flexible rubber material having oil resistance and temperature resistance, and is formed to be foldable into a bellows shape, for example.

  Further, a stopper plate 41 (corresponding to a restricting member described in the claims) so as to protrude toward the inside (center direction) of the housing 20 along the inner surface of the housing 20 on the outlet 23 side of the rubber packing 40. ). The stopper plate 41 is made of, for example, metal or resin (for example, engineering plastic), and is a member having a plate-like longitudinal section formed in a frame shape when viewed from above. The stopper plate 41 restricts the rubber packing 40 from extending toward the outlet 23 by the suction force of the oil pump 15 when the oil pump 15 is driven, and the screen 30 and the housing 20 (lower body 22). The distance from the bottom surface is regulated (held) to a predetermined distance. The stopper plate 41 is formed such that when the position of the screen 30 is regulated, the tip (inner edge) thereof substantially coincides with the tip (inner edge) of the rubber packing 40 folded in a bellows shape. It is preferable.

  The stopper plate 41 and the rubber packing 40 are clamped on the inner surface of the housing 20 by caulking the outer edges of the stopper plate 41 and the rubber packing 40 over the entire circumference at the mating surface of the upper body 21 and the lower body 22. The stopper plate 41 does not necessarily have to be attached over the entire inner surface of the housing 20.

  By having the configuration as described above, the screen 30 can be moved up and down. That is, when the engine is stopped and the drive of the oil pump 15 is stopped, the suction force by the oil pump 15 is lost, and the dead weight of the rubber packing 40 and the screen 30 and the retainer 31 are removed as shown in FIGS. , The rubber packing 40 formed in a bellows shape extends, and the screen 30 attached to the retainer 31 descends to the bottom surface of the housing 20 (lower body 22).

  On the other hand, when the oil pump 15 is being driven, the screen 30 attached to the rubber packing 40 and the retainer 31 together with the oil is brought into contact with the outlet 23 by the suction force of the oil pump 15 as shown in FIGS. Sucked into. In response to this, the rubber packing 40 is folded in a bellows shape and contracted, so that the screen 30 rises from the bottom surface of the housing 20 (lower body 22).

  However, at that time, when the rubber packing 40 abuts against the stopper plate 41, the rubber packing 40 is restricted from extending toward the outlet 23, and the distance between the screen 30 and the bottom surface of the housing 20 (lower body 22) is increased. Maintained at appropriate intervals. Thereby, a filtration area is ensured appropriately and oil filtration is performed efficiently.

  As described above in detail, according to the present embodiment, when the drive of the oil pump 15 is stopped, the suction force by the oil pump 15 is lost, and the weight of the rubber packing 40 and the weight of the screen 30 and the retainer 31 are eliminated. As a result, the rubber packing 40 extends, and the screen 30 attached to the retainer 31 descends to the bottom surface of the housing 20 (lower body 22). Therefore, there is no region where bubbles on the inlet 24 side (unfiltered side: dirty side) grow (see FIG. 3), thereby preventing bubble growth. As a result, it is possible to suppress the air biting of the oil pump 15 at the start of driving of the oil pump 15.

  On the other hand, when the oil pump 15 is driven, the rubber packing 40 and the screen 30 attached to the retainer 31 are sucked together with the oil by the suction force of the oil pump 15 to the outlet 23 side, and the rubber packing 40 is Shrink. Thereby, since the area | region by the side of the inflow port 24 is expanded and the filtration area is ensured, oil filtration can be performed efficiently.

  In particular, according to the present embodiment, the rubber packing 40 is made of a flexible rubber material and is formed to be foldable in a bellows shape. Therefore, when the drive of the oil pump 15 is stopped, The screen 30 can be lowered to the bottom surface of the housing 20 (lower body 22) by extending the rubber packing 40 formed in a bellows shape by the weight of the retainer 31. On the other hand, when the oil pump 15 is driven, the rubber packing 40 and the screen 30 attached to the retainer 31 are sucked together with the oil by the suction force of the oil pump 15 toward the outlet 23, and the rubber packing 40 is accordingly accordioned. The screen 30 can be lifted from the bottom surface of the housing 20 (lower body 22) by being folded and contracted.

  Further, according to the present embodiment, the rubber packing 40 is restricted from extending toward the outlet 23 by the suction force of the oil pump 15, and the distance between the screen 30 and the bottom surface of the housing 20 (lower body 22) is set to a predetermined value. Since the stopper plate 41 that regulates (holds) the gap is provided, when the oil pump 15 is driven and the rubber packing 40, the screen 30, and the like are sucked toward the outlet 23 by the suction force of the oil pump 15, the rubber packing It can control that 40 extends to the outflow side. Therefore, it is possible to keep an appropriate distance between the screen 30 and the bottom surface of the housing 20 (lower body 22).

  As described above, the stopper plate 41 is a member having a plate-like cross section formed in a frame shape, and is closer to the outlet 23 side than the rubber packing 40 along the inner surface of the housing 20. It is provided so as to protrude inward. Therefore, when the screen 30 or the like is sucked toward the outlet 23 by the suction force of the oil pump 15, the rubber packing 40 abuts against the stopper plate 41, so that the rubber packing 40 extends toward the outlet 23. Can be easily and reliably prevented.

(Modification)
By the way, for example, when the rubber packing 40 is not fully extended only by the weight of the rubber packing 40 and the weight of the screen 30 and the retainer 31 or when it takes too much time to extend, the expansion of the rubber packing 40 is assisted. Therefore, as shown in FIG. 5, an elastic member such as a spring coil 60 may be interposed between the stopper plate 41 and the rubber packing 40 to bias the rubber packing 40 in the extending direction. FIG. 5 is a cross-sectional view showing the configuration of the oil strainer 11 according to a modification (state when the oil pump is not driven).

  In this way, for example, even when the screen 30 is difficult to descend, the screen 30 can be quickly lowered to the bottom surface of the housing 20 (lower body 22).

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, the oil strainer 10 according to the present invention can be applied to a transmission such as a DCT or a manual transmission (MT), for example, in addition to a continuously variable transmission (CVT) or a stepped automatic transmission (AT). . Further, the present invention is not limited to a transmission, and can be applied to, for example, an oil strainer of an engine.

  Moreover, in the said embodiment, in order to make the rubber packing 40 extendable, the rubber packing 40 was formed in a bellows shape, but the rubber packing 40 may adopt another structure as long as it can be extended. A material other than rubber may be used.

  Moreover, the shape of the inflow port 24 of the oil strainers 10 and 11 is not restricted to the said embodiment, It can change into various shapes. For example, in the above-described embodiment, the inflow port 24 is formed to have a cylindrical portion that protrudes outward from the lower surface of the lower body 22, but has a shape (configuration) that does not have such a cylindrically extending portion. ), That is, it may be configured only by a circular or other shape hole formed in the lower surface of the lower body 22. Moreover, it is good also as a shape (structure) that the wall part was added to the arbitrary positions of the front-back, left-right direction of a vehicle.

10, 11 Oil strainer 15 Oil pump 20 Housing 21 Upper body 22 Lower body 23 Outlet 24 Inlet 30 Screen 31 Retainer 40 Rubber packing 41 Stopper plate 60 Spring coil

Claims (5)

In the oil strainer that is disposed upstream of the oil pump and captures foreign matter in the oil sucked into the oil pump,
A housing having an inlet through which oil flows in and an outlet through which oil flows out;
A filter medium disposed in the housing so as to divide the housing into a region on the inlet side and a region on the outlet side, and traps foreign matters in oil;
A frame-shaped elastic member provided between the filter medium and the housing along the outer periphery of the filter medium,
The stretchable member has oil resistance and stretchability, and is extended by its own weight and the weight of the filter medium when the drive of the oil pump is stopped, and by the suction force of the oil pump when the oil pump is driven. An oil strainer that shrinks when the filter medium is sucked together with oil.   The oil strainer according to claim 1, wherein the elastic member is made of an oil-resistant rubber material and is formed to be foldable in a bellows shape.   When the oil pump is driven, a regulating member that regulates the distance between the filter medium and the bottom surface of the housing by regulating the expansion and contraction of the expansion member to the outlet side by the suction force of the oil pump. The oil strainer according to claim 1, further comprising:   4. The oil strainer according to claim 3, wherein the restricting member is provided on the outlet side of the expansion and contraction member so as to protrude to the inside of the housing along the inner surface of the housing. . 5. The oil strainer according to claim 3, further comprising an elastic member interposed between the regulating member and the elastic member and biasing the elastic member in a direction of extending the elastic member.

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