JPS5894671A - Strainer for use in automatic transmission - Google Patents

Abstract

PURPOSE:To prevent refloating of foreign matter that has been once settled at the bottom of a cap member, by disposing a magnet at the lowest part of the cap member which is formed under a filter to introduce oil thereinto, and providing a plate inclined downward toward the oil inlet side of the cap member in the manner of covering the magnet from upward. CONSTITUTION:A cap member 32 attached to a valvebody 21 consists of a bottom wall 32a inclined downward toward the front, a front wall 32b rising upward from the front end of the bottom wall 32a with a proper frontward inclination, a rear wall 32c rising upward from the rear end of the bottom wall 32a also with a proper inclination and having a smaller length than the front wall 32b, and a pair of side walls 32d having the same shape and erected upward on both sides of the bottom wall 32a. The rear wall 32c is formed with two inlet ports 32e. Further, a magnet 33 is fixed to the bottom wall 32a of the cap member 32 at its lowest part, and the magnet 33 is covered from above with an inclined plate 34 which is fixed to the front wall 32b to incline downward toward the rear end of the cap member 32 as different from the bottom plate 32a.

Description

DETAILED DESCRIPTION OF THE INVENTION 11 The present invention relates to a strainer device for an automatic transmission, and more specifically, the present invention relates to a strainer device for an automatic transmission, and more specifically, a method for distributing oil stored inside an oil pan covering the bottom of a transmission case into the oil pan using an oil pump. A oil pump for an automatic transmission, which pumps up oil through a filter and a pump suction port, supplies it to a hydraulic control device that controls a planetary gear unit, and returns the supplied oil to the inside of the oil pan. Regarding equipment.

Generally, a hydraulic control device for this type of automatic transmission includes a large number of control valves and extremely complicated oil passages that connect these valves. For this reason, in order to operate this hydraulic control device properly, it is necessary to sufficiently prevent minute contaminants such as chips from getting into the oil applied to the hydraulic control device. Therefore, a filter with high filtration ability must be used to filter the oil applied to the hydraulic control device, and as a result, the filter becomes clogged quickly, increasing the frequency of its replacement and cleaning work.

The present invention was made by paying attention to such actual situation.
The main purpose is to provide a strainer device that can sufficiently suppress clogging of the filter, thereby reducing the frequency of filter replacement and cleaning work.

Hereinafter, the present invention will be explained based on the drawings. FIG. 1 shows a part of an automatic transmission equipped with a strainer device according to the present invention. Mission case 1 of this automatic transmission
An oil pan 12 covering the bottom of the oil pan 1 is attached via a valve plate 13, and a hydraulic control device 20, a planetary gear unit (not shown), a torque converter, an oil pump, etc. are disposed inside the oil pan 12.

Further, inside the oil pan 12, a strainer device 30, which is a main part of the present invention, is disposed. In this automatic transmission, the oil stored in the oil pan 12 is pumped up by the oil pump from the strainer device 30 and the pump suction port taa provided in the valve plate 13, and the pumped oil is used to control the torque converter and hydraulic pressure. device 20
Each control valve 22+1 assembled in Harzhob-21 of
．． 22), etc., and the applied oil is configured to flow back into the oil pan 12.

As shown in FIGS. 1 and 2, the strainer device 30 includes a filter 31, a lid 32 that covers the lower surface of the filter 31, and a magnet 33 provided inside the lid 32.
and an inclined plate 34, and is removably attached to a boss portion 21a protruding from the lower body of the valve body 21. The lid body 32 has a bottom wall 32a that slopes downwardly to the front, a front wall 321) that slopes upwardly from the front end of the bottom wall 82a to the front, and a front wall 321) that slopes upwardly from the rear end of the bottom wall 32a to the rear. A paddle rear wall 320 and a pair of left and right side walls 32d of the same shape standing up from the side ends of the bottom wall 32a.
, 32 (1), and the rear wall 320 is provided with two inlets 326 , 326 .
is attached to the boss portion 21a integrally with the filter 31 so that the bottom portion thereof is located below the pump suction port taa, thereby covering the lower surface side of the filter 31. Further, a magnet 33 is fixed to the bottom wall 82aJ= at the bottom of the lid 32 in close proximity to the front wall 321). This magnet 33 is covered above by an inclined plate 34 fixed to the front wall 321]. The inclined plate 34 has a bottom wall 82
Unlike a, it slopes downward to the rear and covers the upper part of the magnet.

In the automatic transmission equipped with the strainer device 30 configured in this manner, the oil inside the oil pan 12 flows as shown by the arrow in FIG. 1 due to the pumping action of the oil pump. That is, oil located outside the strainer device 30 in the oil pan 12 flows into the strainer device 30 through the inflow ports 82e and 826 at the rear of the lid body 32, flows out through the filter 81, and is pumped out from the pump suction port taa. It can be raised. By the way, much of the oil that has flowed into the strainer device 30 flows along the bottom wall 32a of the lid body 32 to varying degrees due to the pumping action of the oil pump, increasing the settling action of impurities in the oil, and Contaminants that have settled during the sedimentation and on the bottom wall 82a are suppressed toward the magnet 33 and are attracted to the magnet 33. In addition, the contaminants settling on the inclined plate 34 immediately descend to the vicinity of the magnet 33 along the inclined plate 3Fl-4 and are attracted to the magnet 33. Furthermore, even if foreign substances that have been once attracted to the magnet 33 are detached due to the flow of oil, etc., they are prevented from floating toward the filter 31 by the inclined plate 34, and are either attracted to the magnet 38 again or removed from the inclined plate 34. stays below. Therefore, according to the strainer device 30, the impurities in the oil are removed from the filter 31.
There is little flow to the side, and there is also little chance of sedimented contaminants floating toward the filter 31 side, so that clogging of the filter 31 due to contaminants is suppressed. As a result, the frequency of replacing the filter 31 and the frequency of cleaning operations can be greatly reduced.

Note that this embodiment merely shows one embodiment of the present invention, and the strainer device according to the present invention uses an oil pump to drain oil stored in an oil pan that covers the bottom of a transmission case. 6-Various automatic transmissions The strainer device can be used in a machine, and when it is used, the strainer device can be modified as appropriate without departing from the gist of the invention.

As explained below, in the various automatic transmissions described in (1), the present invention provides an oil pan that is provided inside the oil pan with a bottom portion that is inclined downwardly along the lower surface side of the filter and is located on the pop suction side. A lid is disposed that has an inlet on a side opposite to the pump suction port and covers a lower surface side of the filter, and a magnet is provided inside the lid at the bottommost portion. In addition, the structure is characterized in that an inclined plate is provided on the -L side of the magnet to be inclined downward toward the inlet side of the lid body to cover the upper part of the magnet. Therefore, according to the straining device according to the present invention, it is possible to enhance the sedimentation effect of the contaminants in the oil that has flowed into the straining device so that the contaminants are attracted to the magnet, and - to prevent the contaminants that have settled down from floating to the surface. As a result, clogging of the filter is suppressed, and the frequency of filter replacement and cleaning work can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a partial longitudinal sectional side view of an automatic transmission employing a strainer device according to the present invention, and FIG. 2 is an enlarged front view of the lid body constituting the straining device, viewed from the rear side. Explanation of symbols 11...Mission case, 12...Oil pan, 13...Valve brake l~, 1B&...Pump suction port, 20...Hydraulic control device, 30...・・・
Strainer device, 31...filter, 32...
Lid body, 32e... Inflow port, 33... Magnet, 34
...Slanted board. Applicant Aisin Seiki Co., Ltd. Representative Patent Attorney Teru Hase

Claims (1)

[Claims] Oil stored in an oil pan that covers the bottom of the transmission case is pumped up by an oil pump through a filter and a pump suction port arranged inside the oil pan, and applied to a hydraulic control device that controls a planetary gear unit. In the automatic transmission, the oil pan is configured to have a lowermost portion inclined downwardly along the lower surface side of the filter, and a bottom portion thereof is located on the pump suction port side. a lid having an inlet on a side opposite to the pump suction port and covering a lower surface side of the filter, and a magnet is provided inside the lid at the bottom portion thereof; . A strainer device for an automatic transmission, characterized in that an inclined plate is provided above the magnet and is inclined downward toward the inlet side of the lid body to cover the −L side of the magnet.