JPS59155647A - Oil filter for automatic transmission - Google Patents

Abstract

PURPOSE:To prevent minute foreign substances from entering with no performance for highly accurate machining, by installing a tongued piece projectingly in the lower end surface of each opposite side plate of a filter frame, while pressing the filter frame toward the peripheral of an opening part by this tongued piece with elastic force. CONSTITUTION:A filter frame 7 is constituted of a rectangular top plate 8 and a pair of opposite side plates 9, while a tongued piece 9a having elasticity in both vertical directions is projectingly installed in the lower end surface of each opposite side plate 9. With this constitution, when an oil filter 6 is set up in an oil passage 5, the rectangular top plate 8 of the filter frame 7 can be pressed to the periphery of an opening part by the tongued piece 9a so that strict sizing accuracy like in case of sealing by means of tight fitting is not entirely required at all and, what is more, admission of minute foreign substances into each of valve bodies 1 and 2 inside can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil filter that removes foreign matter such as dust mixed into the hydraulic oil of an automatic transmission.

Automatic transmissions use hydraulic oil as a medium for automatic gear shifting, but if foreign matter is mixed into the hydraulic oil, it can cause problems such as sticking in various valves. Therefore,
Oil filters are usually installed in the suction part of the oil pump that supplies hydraulic oil to various valves and in the governor circuit, and measures are taken to remove foreign matter from the hydraulic oil that flows to the valve body where various valves are housed together. It is being

However, since this countermeasure only installs the oil filter outside the valve body, minute foreign matter that passes through the oil filter can enter the valve body and cause damage to the various valves housed within the valve body.

There are concerns about problems such as ticking. This concern is particularly acute in the case of an electronically controlled automatic transmission in which a valve body is equipped with a large number of solenoids, since the solenoids are easily affected by foreign matter.

Therefore, 1- connects the various valves of the valve body.

From the viewpoint that the above-mentioned concerns can be resolved by providing an oil filter also in the oil passage, automatic transmissions in which this type of oil filter is provided in the valve body are put into practical use in some vehicles. This type of oil filter has a valve body formed by combining an upper valve body 1.1- and a lower valve body, and has oil passages formed by openings in the mating surfaces of these pulp bodies so as to communicate with each other. Since it communicates between various pulps, it is conceivable to construct it as shown in FIG. 8, for example, in order to insert it into the opening of the oil passage.

That is, in FIG. 8, a indicates an upper valve body, b indicates a lower valve body, and C and CI each indicate a valve body a.

b indicates an oil passage for communicating with various valves, which is opened at the mutually mating surfaces so as to communicate with each other, and e indicates an oil filter, respectively. The oil filter e has a hollow conical frame body f, and oil passages c and d are provided in the frame body.
An oil passage opening g is formed through which the hydraulic oil passes, and a reticulated ladle body is provided to cover the oil passage opening g. This oil filter e locks the bottom end flange portion 1 of the filter frame f between the knob bodies a and b, and tightly fits and seals the cylindrical portion j adjacent to the flange portion 1 into the opening of the oil passage d. Install it.

However, in such an oil filter, since the filter frame f partitions the oil passages c and d in the cylindrical part j and guides the hydraulic oil to the opening g, the cylindrical part j is tightly fitted and sealed into the opening of the oil passage d. It has to be machined with high precision to ensure that the oil flow is accurate, which makes it expensive, and the cylindrical part j cannot be used as an oil passage opening. This is only practical if the height of the body case is very large. On the other hand, some oil filters simply have a disc-shaped flat oil filter inserted into the groove in the mating surfaces of the upper and lower valve bodies, but this does not provide enough filter area and is difficult to fit tightly. Because this was not done properly, tiny foreign objects could sometimes get in through the gaps.

The present invention was conceived based on the idea that the above-mentioned problems can be solved at once by configuring the filter frame to be elastically pressed against the periphery of the opening of the oil passage and below the seal when the valve bodies are assembled together. It is an object of the present invention to provide an oil filter for an automatic transmission that embodies the above, and for this purpose, the oil filter of the present invention has a filter frame made of
When the pulp bodies are combined with each other, an elastic means is provided which seats on one pulp body and presses the filter frame against the periphery of the opening of the oil passage in the other pulp body so as to seal the oil passage opening of the filter frame. It is characterized by being covered with the body.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

1 and 2 show embodiments of the present invention, in which 1 is an upper valve body, 2 is a lower valve body,
8 is separate brake), 4.5 is valve body 1 respectively
, 2 is an oil passage for communication between valves formed by opening in the mutually mating surfaces of the valves 4 and 2 to communicate with each other.
, 5 are formed in the separate plate 8 to communicate with each other.

The oil filter 6 of the present invention is configured to be inserted into the opening of the oil passage 5, for example, and used to filter out foreign substances in the hydraulic oil flowing from the oil passage 4 to the oil passage 5 or flowing in the opposite direction.

For this purpose, the oil filter 6 of the present invention includes a filter frame 7, which is composed of a rectangular top plate 8 and a pair of opposing sides vi9. The filter frame 7 is integrally molded from synthetic resin such as plastic, and a rectangular opening 8a is formed in the center of the rectangular top plate 8. A pair of opposing sides Fi9 are protruded from the side far from the upper surface 8b of the top plate 8, these side plates 9 are arranged at both ends of the rectangular top plate 8, and an oil passage opening 10 communicating with the opening 8a is set between the side plates 9. In addition, this oil passage opening l
O is covered with a net-like f pan body 11, and the f pan body 11 is box-shaped with an open top. The sawawa pot body 11 has a rectangular opening 8a at its top opening edge.
The filter frame 7 is attached to the filter frame 7 by bonding it along the inner edge thereof, and by bonding the surface along the side plate 9 to these side plates.

On the lower end surfaces of both side plates 9, integrally molded tongue pieces 9a having elasticity in the vertical direction are provided to protrude, respectively, and these constitute elastic means 12. It is preferable that these tongue pieces 9a protrude an equal distance from the lower end of the side plate 9.
In any case, the amount of protrusion of these tongue pieces should be sufficient,
In the free state of the tongue pieces 9a, these tongue pieces are attached to the oil passage 5.
A rectangular top plate 8 is made to protrude above the opening edge of the oil passage 5 on the shoulder portion 5a.

The oil filter 6 of the present invention having the above-mentioned structure is installed in an oil path.

5, the oil filter is first inserted into the oil passage 5, and the tongue piece 9a is placed on the shoulder portion 5a. Here, when both valve bodies 1 and 2 are combined with a separate plate 8 interposed between them, the upper plate 1 elastically deforms the tongue piece 9a through the separate plate 8, and the filter frame 7 is inserted into the oil passage 5. Push it to the position. According to the above, the present invention oil filter 6
is inserted between the openings of the oil passages 4 and 5, but in this state, the tongue piece 9a is caused by its elastic reaction force to cause the upper surface of the rectangular top plate 8 sbB the periphery of the separate plate opening 8a (if the separate plate 8 is retracted, the oil Press against the opening periphery of channel 4 to seal.

Therefore, all the hydraulic oil flowing between the oil passages 4 and 5 passes through the mesh filter 11 that covers the oil passage opening 10, and during this time, foreign substances in the hydraulic oil can be removed.Thus, the oil filter 6 of the present invention As mentioned above, when the filter frame 7 is assembled, it is seated on one pulp body 2 and the oil passage 4 in the other pulp body 1 is installed.
An elastic means 12 is provided on the periphery of the opening to press the filter frame 7 so that it is sealed, and the oil passage opening 10 of the filter frame 7 is covered with the ladle body 11. Surface 8 of frame 7
b may be a plane that crosses the hydraulic oil flow, and strict dimensional accuracy is not required at all as in the case where the seal is pressed by fitting, and it can be manufactured at low cost. In addition, for the same reason, the oil filter 6 of the present invention secures a sufficiently large filter area and does not become long in the direction of hydraulic oil flow due to force.
It can even be made flat in the direction transverse to the hydraulic oil flow, and can be put into practical use without difficulty even when the opening of the oil passage 5 that accommodates it is short.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an oil filter of the present invention inserted into a valve body of an automatic transmission, FIG. 2 is a side view thereof, and FIG. 8 is a front view showing a conventional oil filter. 1.2...Valve body 8...Separate plate 4.5...Oil passage 5a...Shoulder 6...Invention oil filter 7...Filter frame 8...Top plate 8a...
Top plate opening 8b...Top surface for sealing 9...Opposing side plate 9a...Elastic tongue piece 10...Oil passage opening 11...Mesh-shaped pot body 12...Elastic means. Patent applicant: Nissan Auto Body Engineering Co., Ltd. Figure 1 Figure 3

Claims (1)

[Claims] 1. An oil filter for an automatic transmission that is inserted into the openings of oil passages formed by openings in the mating surfaces of the valve bodies so as to communicate with each other, which includes a filter frame, and when the valve bodies are joined together, one of the oil filters is inserted into the openings of the oil passages. An elastic means is provided which is seated on one valve body and presses the filter frame toward the periphery of the opening of the oil passage in the other valve body so as to seal the filter frame, and the oil passage opening of the filter frame is closed with a baffle body. Cover the automatic transmission oil filter.