JPH0612290Y2 - Fluid filter device for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fluid filter device for an automatic transmission, and more particularly to a fluid filter device for an automatic transmission capable of performing efficient filtration.

[Prior art and problems to be solved]

Generally, in a fluid filter device for an automatic transmission,
A filter in which a wire mesh filter of 20 to 200 mesh is provided in upper and lower cases made of sheet metal or resin to capture dust in a fluid is used.

However, due to the high performance and precision of automatic transmissions in recent years, it is necessary to improve the dust capturing performance in the filter device as well, and recently, a felt-like filter made of fiber such as nylon or polyester is used. Those shown in are being used.

That is, in the fluid filter device for an automatic transmission shown in FIG.
As shown in the figure, the opening 34 of the sheet-shaped filter 33 folded in two is positioned and caulked, and the upper part of the lower case 31 is
An upper case 36 having an outflow port 35 is positioned, and the three edges of the sheet-shaped filter 33 other than the portion a are crimped and fixed.

Then, the oil 38 in the oil pan 37 flows into the inside from the inflow port 32 of the lower case 31 by the suction negative pressure of the oil pump, the dust in the oil 38 is filtered by the filter 33, and the clean oil is discharged to the outflow port 35. The oil that flows toward the outside and flows out from the outflow port 35 is sent to the automatic transmission.

However, when the filter 33 is made of fiber such as nylon or polyethylene as described above, the dust capturing performance is improved as compared with the wire mesh filter, but the resistance when the oil passes increases. Therefore, in order to secure the same oil passage amount as the wire mesh filter when the suction negative pressure and the oil temperature are constant, the area of the filter must be increased.

On the other hand, when the temperature of the oil decreases and the viscosity rises, the oil passage resistance increases further, so the area must be made larger. Therefore, a larger oil passage area than that using the wire mesh filter is required. Therefore, there is a problem that it is difficult to miniaturize.

This invention solves the problems of the conventional ones as described above, and it is possible to reduce the size of the whole and to obtain the dust trapping performance without lowering the oil passage amount as compared with the one using the wire mesh filter. An object of the present invention is to provide a fluid filter device for an automatic transmission that can be improved.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention is configured such that the interior is divided into two chambers by a partition portion, and a lower case having an inflow port for each chamber and an upper case having an outflow port have a main flow path and a bypass. Forming a flow path, and in the main flow path, a felt-like filter assembly having a felt-like filter,
In addition, a bypass valve assembly having a wire mesh filter and a bypass valve is disposed in the bypass flow path, respectively, and when the bypass valve is not operated by the suction negative pressure of the outlet, oil is introduced from the inlet. While flowing in and being filtered by the felt filter and flowing out of the outlet, when the bypass valve is activated by the suction negative pressure, oil flows in from the inlet and is filtered by the wire mesh filter and outlet. It has a configuration to flow out from.

[Action]

By adopting the above means, this device can reliably capture even minute dusts containing oil when the oil temperature is high and the viscosity is low, and the oil temperature is low and the viscosity is low. Only when the engine is started high, dust is captured by the wire mesh filter, and this switching is automatically performed according to the suction negative pressure.

〔Example〕

 An embodiment of the present invention shown in the drawings will be described below.

FIG. 1 is a vertical sectional view of a fluid filter device for an automatic transmission according to the present invention, and FIG. 2 is a plan view of the fluid filter device for an automatic transmission. The fluid filter device for an automatic transmission is made of resin. Upper case 1 and lower case 2, above this,
The felt-like filter assembly 3 and the bypass valve assembly 4 arranged inside the lower cases 1 and 2, and the filter pressing member 5 for holding the felt-like filter assembly 3 and the bypass valve assembly 4 at predetermined positions. And have.

As shown in detail in FIGS. 3 and 4, the lower case 2 is configured to have a box shape with an open top surface, and a partition portion 6 for partitioning in the width direction at the center of the bottom surface. One of the inside of the lower case 2 that is provided and is partitioned by the partition section 6 is formed in the bypass channel, and the other is formed in the main channel, and the lower case 2 is partitioned by the partition section 6. On the main flow path side of the inside of the
Is provided, and the step portion 10 is provided on the inner periphery thereof.

On the other hand, a bypass inlet 7 is provided in a portion of the bottom surface of the bypass flow path which is adjacent to the partition portion 6, and a step portion 8 is formed on the inner periphery of the bottom surface.

It should be noted that the passage 11 may be formed in the main meat relief if necessary.

5 and 6 show the components of the felt-shaped filter assembly 3, which comprises a felt-shaped filter 12 and a rectangular tube-shaped rubber packing 13, As shown in FIG. 5, the felt-like filter has a felt 15 having a lattice-like reinforcing plate 14 provided on one surface thereof, and the felt 15 has an outer peripheral edge portion covered with a peripheral portion of the lattice-like reinforcing plate 14. The felt 15 is tightly fixed to prevent the felt 15 from being deformed.

Further, the rubber packing 13 has a rectangular tubular shape with upper and lower surfaces opened and is sized so as to be positioned in the main flow path of the lower case 2, and is of a felt shape positioned on the step portion 10 of the lower case 2. The filter 12 is pressed.

7 to 10 show a bypass valve assembly 4 arranged in the bypass flow path of the lower case 2, and the bypass valve assembly 4 includes a rubber packing 16
And a wire mesh filter 17 attached to the rubber packing 16 and a bypass valve 18.

Similar to the rubber packing 13 of the felt-like filter assembly 3, the rubber packing 16 has a rectangular tube shape with upper and lower surfaces opened, and unlike the rubber packing 13, a groove 19 is provided on the inner peripheral surface. .

It should be noted that beads may be provided on the upper and lower surfaces in order to improve the contact state, and the same applies to the rubber packing 13.

Further, in the wire netting filter 17, the resin net 21 is integrally formed by insert molding the wire net 20. Therefore, the wire net 20 is reinforced by the resin frame 21.

The bypass valve 18 is shown in FIG.
0, a valve seat 23 having a hole 22 formed in the central portion thereof, a valve 24 capable of closing the hole 22 of the valve seat 23, and the valve 24 closing the hole 22. It is composed of a spring 25 for biasing the spring 25 and a spring retainer 26 for supporting the spring 25 so as to generate an urging force on the valve 24. The spring retainer 26 passes through the spring retainer 26. A hole 26a is formed.

As shown in FIG. 11, the filter pressing member 5 has a frame-like shape, and is provided with a flange portion 27 that can be located above the peripheral edge of the lower case 2 on the outer peripheral surface thereof, and is provided on the lower case 2. A packing retainer 28 that abuts the upper surface of the defined partition portion 6 is provided in the width direction to form a portion corresponding to the main flow passage and a portion corresponding to the bypass flow passage.

Next, a case of assembling the one configured as described above will be described.

First, the felt filter assembly 3 and the bypass valve assembly 4 are located inside the lower case 2.

In this case, when the felt-like felt assembly 3 is located inside the lower case 2, first, the felt-like filter 12 is placed so that the reinforcing plate 14 thereof faces upward.
The peripheral portion is located at the step portion 10 of the main flow path of the lower case 2, and then the rubber packing 13 is located above the felt filter 12.

Further, when the bypass valve assembly 4 is positioned, first, the bypass valve 18 is positioned in the step portion 8 of the bypass passage so that the spring retainer 26 of the bypass valve 18 faces upward, and then, in the groove 19. The rubber packing 16 in which the wire netting filter 17 is fitted is located at.

Next, when the filter pressing member 5 is positioned, the peripheral edge of the flange portion 27 of the filter pressing member 5 coincides with the upper peripheral edge of the lower case 2, and a part of the peripheral edge of the felt-like filter assembly 3 is provided. The upper surfaces of the rubber packing 13 and the rubber packing 16 of the bypass valve assembly 4 are pressed, and the lower surface of the packing pressing portion 28 contacts the upper surface of the partition 6 of the lower case 2 and the upper surfaces of the rubber packings 13 and 16.

After that, when the upper case 1 is positioned and the lower case 2, the filter pressing member 5, and the upper case 1 are integrated by welding or the like, the main inflow port 9 of the felt-like filter assembly 3 in the main flow path. The first chamber A is formed on the side, and the second chamber B is formed on the side of the outlet 29 of the felt-like filter assembly 3.

On the other hand, in the bypass flow path, the third chamber C on the side of the bypass inlet 7 of the bypass valve assembly 4,
The fourth chamber D is formed on the outlet 29 side.

Next, the operation of the above will be described.

Even in the fluid filter device for an automatic transmission according to the present invention, like the above-mentioned conventional device, the fluid filter device is arranged inside the oil pan to apply suction negative pressure.
The suction negative pressure at is acting on the second chamber B and the fourth chamber D.

When the engine is operating, the oil temperature is generally high and the viscosity is low. Therefore, the oil in the oil pan is guided to the first chamber A through the main inlet 9.
After being filtered by the felt filter 12, it is supplied to the engine from the outflow port 29 through the second chamber B.

Therefore, in this state, the oil in the oil pan is filtered only by the felt filter 12.

On the other hand, when the oil temperature is low and the viscosity is high when the engine is started as in the winter, the oil resistance of the felt filter 12 increases and it becomes difficult for the oil to pass through. Therefore, the oil pump works to secure a necessary oil amount. The suction negative pressure acting on the outflow port 29 increases, and this acts on the fourth chamber D.

The negative pressure is applied to the spring 25 of the bypass valve 18.
When the valve 24, which has closed the hole 22 by the urging force of the spring 25, opens the hole 22,
The oil in the oil pan flows from the bypass inlet 7 to the third chamber C.
To reach the wire mesh filter 17 through the hole 22 of the bypass valve 18 and the passage hole 26a of the spring retainer 26,
The oil, which has been filtered by the wire mesh filter 17 and from which dust that adversely affects the engine is removed, is supplied to the engine.

Even if the oil temperature is low, the oil temperature rises in a short time with the rotation of the engine, so that the bypass valve 18 is closed in a short time, so that only the felt filter 12 passes. Since it switches, further,
The dust capturing performance is improved.

[Effect of device]

According to the present invention, as configured as described above, when normal engine operation in which the oil temperature is high and the viscosity is low, the suction negative pressure is small, so the oil from which dust has been removed flows out only through the felt filter, Also, when the temperature of the oil is low and the viscosity is high, such as in winter, the felt resistance increases the oil passage resistance, which increases the suction negative pressure, and this suction negative pressure opens the bypass valve. The oil from which the dust has been removed by the wire mesh filter flows out through the, so that the dust can always be reliably captured and clean oil can be flowed out. It can be filtered physically.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a fluid filter device for an automatic transmission according to the present invention, FIG. 2 is a plan view, FIG. 3 is a partially cutaway schematic perspective view of a lower case, and FIG. , Fifth
FIG. 7 is a partially cutaway schematic perspective view of a felt filter, FIG. 6 is a partially cutaway schematic perspective view of a rubber packing of a felted filter assembly, and FIG. 7 is a partially cutaway schematic perspective view of a wire mesh filter. Is a partially cutaway schematic perspective view of the rubber packing of the wire mesh filter assembly, FIG. 9 is a plan view of the bypass valve, FIG. 10 is a longitudinal sectional view, and FIG. 11 is a partially cutaway schematic perspective view of the filter pressing member. 12 and 13 show a conventional fluid filter device for an automatic transmission, FIG. 12 is a schematic vertical sectional view, and FIG. 13 is a schematic diagram showing a felt filter. 1, 36 ...... Upper case 2, 31 ...... Lower case 3 ...... Felt type filter assembly 4 ...... Bypass valve assembly 5 ...... Filter holding member 6 ...... Partitioning section 7 ...... Bypass inlet 8, 10 ... … Step 9 …… Main inlet 11 …… Meat escape 12 …… Felt filter 13,16 …… Rubber packing 14 …… Reinforcement plate 15 …… Felt 17 …… Metal mesh filter 18 …… Bypass valve 19 …… Groove 20 ... Wire mesh 21 ... Resin frame 22 ... Hole 23 ... Valve seat 24 ... Valve 25 ... Spring 26 ... Spring retainer 26a ... Passage hole 27 ... Flange 28 ... Packing retainer 29, 35 ... Outlet 32 ... Inlet 33 ... Filter 34 ... Opening 37 ... Oil pan 38 ... Oil

Claims (1)

[Scope of utility model registration request] 1. A lower case (2) having an inlet (7) (9) for each chamber and an upper outlet having an outlet (29) while the interior is divided into two chambers by a partition (6). The case (1) forms a main flow path and a bypass flow path, a felt filter assembly (3) having a felt filter (12) is provided in the main flow path, and the bypass flow path is also provided. The wire mesh filter (17) and the bypass valve (18)
When the bypass valve assembly (4) having the above is disposed, and the bypass valve (18) is not operated by the suction negative pressure of the outlet (29), oil flows in through the inlet (7). When the bypass valve (18) is actuated by the suction negative pressure, oil flows in through the inflow port (9) while being filtered by the felt filter (12) and flowing out through the outflow port (29). A fluid filter device for an automatic transmission, characterized by being filtered by the wire mesh filter (17) and flowing out from an outlet (29).