JPH0444935Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an oil filter provided within a valve body of an automatic transmission.

(Prior Art) Automatic transmissions are configured to change gears by selectively hydraulically operating various friction elements (clutches, brakes, etc.). Selective hydraulic actuation of various friction elements, that is, speed change control, is normally controlled by various valves built into the valve body and oil grooves connecting these valves. This valve body is usually a combination of an Atsupa valve body, a lower valve body, and a separate plate between them, and the oil passes through an opening in the separate plate to the oil groove in the Atsupa valve body and the lower valve body. The above-mentioned speed change control is carried out as oil moving between the grooves.

By the way, iron powder, aluminum powder, and fine dust may be mixed in the oil, and when this reaches various valves, problems such as making them inoperable occur. Therefore, an oil filter is usually provided in the opening of the separate plate to remove foreign substances from the oil.

As this type of oil filter, the one shown in FIG. 4, which is used in the A240E automatic transmission manufactured by Toyota Motor Corporation, is known. In Fig. 4, 1 is the Atsupa valve body, 1a is the oil groove provided therein, 2 is the lower valve body, 2a is the oil groove provided therein, and 3 is the part interposed between the Atsupa valve body 1 and the lower valve body 2. separate plate,
Reference numeral 3a indicates an opening provided in this separate plate and communicating between the oil grooves 1a and 2a, and reference numeral 4 indicates an oil filter provided in the opening 3a.

The oil filter 4 is constructed by horizontally suspending a filter mesh 4b within a cylindrical case 4a. Then, a stepped portion 4c is set on the outer periphery of the cylindrical case 4a, consisting of a small diameter portion and a large diameter portion, and the small diameter portion is tightly fitted into the opening 3a, and the stepped portion 4c and the separate plate 3 work together to form a stepped portion 4c. The oil filter 4 is installed by preventing the shaped case 4a from coming off, and a notch 4d is formed in the end face of the large diameter portion.

In this configuration, oil flows from the oil groove 1a to the filter mesh 4 as shown by the arrow in FIG. 4b.
b and notch 4d to the oil groove 2a, and during this time foreign matter mixed in the oil is removed by the filter mesh 4.
It can be removed by b.

(Problem to be solved by the invention) However, in this oil filter 4, the oil groove 2a
It does not have the function to prevent the turbulent flow 6 that occurs when the oil reaches the oil passage structure where it flows over the weir 5 and flows along the separate plate to the oil passage 2b as shown in Fig. 4b, and the oil does not flow smoothly. flow cannot be guaranteed.

The object of the present invention is to provide an oil filter that also has the function of preventing this turbulent flow.

(Means for Solving the Problem) For this purpose, the present invention includes a valve body that is a combination of an upper valve body, a lower valve body, and a separate plate between these two, and an oil valve provided on the separate plate. In an automatic transmission in which hydraulic oil is oil that flows from an oil groove in an upper valve body to an oil groove in a lower valve body through an opening with a filter, and then flows over a weir on the bottom wall of the oil groove and flows along a separate plate. The oil filter is provided with a sealing surface that is pressed in a sealing manner around the opening of the separate plate, and a leaf spring that is seated on the bottom wall of the oil groove so as to maintain the pressing force is provided. It is characterized by a configuration in which the seating end is disposed close to the weir and is curved toward the upper end of the weir.

(Function) The leaf spring uses its elasticity to press and hold the sealing surface of the oil filter around the opening of the separate plate, thereby sealing the oil filter against the separate plate. Therefore, the oil flowing between the oil grooves provided in the upper valve body and the lower valve body passes through the oil filter, and foreign matter in the oil can be removed during this time.

By the way, since the seated end of the leaf spring on the bottom wall of the oil groove is placed close to the weir on the bottom wall of the oil groove and is bent toward the top of the weir, the seated end of the leaf spring rectifies the oil flow upstream of the weir. The oil filter also serves to direct the oil toward the upper end of the weir, preventing turbulence from occurring upstream of the weir and ensuring a smooth oil flow.

(Example) Hereinafter, the present invention will be explained in detail based on the illustrated example.

1 and 2 show an oil filter 10 according to an embodiment of the present invention, and FIG. 3 shows the oil filter 10 in an installed state.

The oil filter 10 has a filter outer casing 11,
The main components are a filter mesh 12 and a leaf spring 13. The filter outer casing 11 is composed of a pair of mutually opposing plates 11a and 11b, and five bridging portions 11c to 11g connecting these plates, which are integrally molded using a plastic material. However, the bridging portions 11c and 11g are arranged at the upper corners of the plates 11a and 11b, thereby establishing a rectangular continuous sealing surface 14 on the filter outer casing 11 as clearly shown in FIG. 1a. And bridging parts 11c, 11d
between 11d and 11e, between 11e and 11f, and between 1
A filter mesh 12 is installed in each opening existing between 1f and 11g. Bridge parts 11d, 11
Although the arrangement of the bridging parts 11d and 11f may be arbitrary, it is preferable to arrange the bridging parts 11d and 11f at the lower corners of the plates 11a and 11b, and the bridging part 11e between the bridging parts 11d and 11f, respectively. The connecting part 11e is connected to the bridging part 11
d, disposed at a lower level than 11f, the bridge part 11
It is preferable that the filter mesh 12 between d and 11e and between 11e and 11f be inclined as shown in FIG. 1b.

As shown in FIGS. 1B and 1C and FIG. 2, the leaf spring 13 is attached at its center to the lower side of the filter outer casing 11 by caulking 15 of the bridge portion 11e. Arms 13a and 13b are integrally provided at the center of the leaf spring 13 and extend along vertical grooves 16 and 17 formed on the outer surfaces of the plates 11a and 11b, and arms 13a and 13b extend along the lower surface of the filter outer casing 11. existing leg 13
c and 13d are provided integrally. Arms 13a, 13
The tips of b are curved so as to recess into the bottom notches 16a and 17a of the grooves 16 and 17, respectively, and these recesses prevent the leaf spring 13 from rotating.
Further, as shown in FIG. 1B, the legs 13c and 13d are inclined so that their respective tips are away from the filter outer casing 11, and this inclination is preferably adjusted so that the legs 13c and 13d
13d is in a free state, as shown in FIG. 1b, between the bridge parts 11d and 11e and 11e.
It is assumed that the filter mesh 12 is located in a symmetrical position with respect to the filter mesh 12 in between. Also, both leg parts 13c, 13
It is preferable to form rectangular holes 13e and 13f in the holes d, respectively, so that oil can flow smoothly.

Furthermore, a positioning protrusion 18 is provided on the bridging portion 11c, projecting outward, so that the mounting direction of the oil filter can be determined as described later.

When putting this oil filter 10 into practical use, as shown in FIG. In this state, the leaf spring 13
A preload is applied to push the oil filter 10 into the oil groove 20a. Then lower valve body 2
0, the separate plate 21 and the upper valve body 22 are sequentially assembled to combine these three parts. At this time, the oil groove 22 of the Atsupa valve body 22
a communicates with the oil groove 20a of the lower valve body 20 through the opening 21a of the separate plate 21, and the preload of the leaf spring 13 presses and holds the upper end sealing surface 14 of the oil filter 10 against the periphery of the opening 21a. is sealed to the separate plate 21.

It is assumed that the oil groove 20a has a weir 20b on the bottom wall and extends along the separate plate 21. The legs 13c and 13d of the leaf spring 13 have at least one leg 13d extending toward the weir 20b, and the seating end 13g of the leg 13d, which is seated on the bottom wall of the oil groove 20a, is disposed close to the weir 20b, and 2
Bend it toward the top of 0b.

By assembling the oil filter 10, the oil from the oil groove 22a flows through the opening 21a and the filter mesh 12 to the oil groove 20a as shown by the arrow in FIG. can be removed.

By the way, since the seal of the oil filter 10 with respect to the separate plate 21 is obtained by pressing and holding the seal surface 14 and the separate plate 21 by the preload of the leaf spring 13, the seal can be maintained even if the various parts expand and contract due to changes in oil temperature. The filter mesh 12 is not damaged, and all the oil always passes through the filter mesh 12, which prevents the filter function from deteriorating. Also, leaf spring 13
does not lose its original spring action even when exposed to high oil temperatures, ensures the above-mentioned pressure retention, does not cause the oil filter 10 to shift, and maintains the original filter function for a long time. obtain.

Furthermore, in the conventional oil filter shown in FIG. 4, the filter mesh 4b is stretched parallel to the bottom of the oil groove 2a, so the total opening area of the filter mesh is small, and the oil does not accumulate upstream of the filter mesh. However, this caused clogging phenomenon.
By slanting the filter mesh 12 with respect to the bottom surface of the oil groove 20a as shown in FIGS. 1b and 3b, the total opening area of the filter mesh becomes larger, and the clogging phenomenon described above can be prevented. . Note that this action and effect is due to the fact that the leg portion 13 of the leaf spring 13
By slanting the legs 13c and 13d as shown in Figures 1b and 3b, rectangular holes 13 are formed in the legs 13c and 13d
This is further promoted by forming the lines e and 13f.

Then, the seating end 13g of the leaf spring 13 is connected to the weir 20b.
Since it is arranged close to the weir and curved toward the upper end of the weir, this seating end can rectify the oil flow on the upstream side of the weir 20b and prevent turbulent flow as shown at 6 in FIG. 4. The oil filter can also perform the function of ensuring smooth oil flow.

(Effect of the invention) Thus, as described above, the oil filter of the present invention has the seating end 13g of the leaf spring 13, which presses the sealing surface 14 of the filter outer casing 11 in a sealing state around the opening 21a of the separate plate 21, on the weir 20b. Since they are placed close to each other and curved toward the upper end of the weir, the seating end 13g has no function of rectifying the oil flow on the upstream side of the weir, and prevents the turbulent flow upstream of the weir that conventionally occurs. Smooth oil flow can be guaranteed.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the oil filter of the present invention, Fig. 1a is a plan view thereof, Fig. 1b is a front view thereof, Fig. 1c is a bottom view thereof, and Fig. 2 is a - cross section of Fig. 1b. 3 shows the oil filter shown in FIG. 1 in use, FIG. , Figure a is its top view, Figure b is its front view, Figure c is
is its bottom view. 10... Oil filter of the present invention, 11... Filter outer casing, 11a, 11b... Opposing plate, 11
c~11g...Bridging portion, 12...Filter mesh, 13...Leaf spring, 13a, 13b...Rotating stop arm, 13c, 13d...Legs, 13e,
13f... Rectangular hole, 13g... Seating end, 14...
Seal surface, 15... Caulked portion, 16, 17... Vertical groove, 16a, 17a... Notch, 18... Positioning protrusion, 20... Lower valve body, 21a...
Opening, 21... Separate plate, 22... Atsupa valve body, 20a, 22a... Oil groove, 2
0b...weir, 21a...opening.

Claims (1)

[Scope of claims for utility model registration] Atsupa valve body, lower valve body,
A valve body is provided which is combined with a separate plate between these two, and the oil groove of the Atsupa valve body leads to the oil groove of the lower valve body through an opening with an oil filter provided in the separate plate, and then the oil groove of the lower valve body is connected to the oil groove of the lower valve body. In an automatic transmission that uses oil flowing along a separate plate over a weir in a bottom wall as hydraulic oil, the oil filter is provided with a sealing surface that is pressed in a sealing manner to the periphery of the opening of the separate plate, An automatic transmission characterized in that a leaf spring is provided that is seated on the bottom wall of the oil groove to maintain the pressure, and a seated end of the spring is disposed close to the weir and is bent toward the upper end of the weir. Oil filter for valve body.