JPH0611372B2 - Valve body-internal oil passage oil strainer and method of manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an oil strainer for an oil passage in a valve body mounted on a hydraulic control device of an automatic transmission.

[Prior Art] Conventionally, since it is impossible to collect foreign matter or small foreign matter that has entered the valve body when the valve body is assembled, the foreign matter is caught in the valve and induces the valve stick.

Therefore, in order to deal with such foreign matter, a method of individually disposing an oil strainer in the oil passage immediately before the valve where the valve stick is likely to occur can be considered.

[Problems to be Solved by the Invention] However, since the space in the valve body is formed by, for example, a mold, the diameter of the opening is sequentially larger than the diameter of the bottom. Therefore, when the oil strainer is arranged in the space, there is a possibility that the foreign matter cannot be reliably collected unless the oil strainer is reliably positioned.

Therefore, the present invention provides an oil passage in a valve body that can be easily placed in a space opened to the side where the separator plate of the valve body of an automatic transmission for vehicles is opened and that can reliably collect foreign matter by performing a reliable seal. The purpose is to provide an oil strainer for use.

Further, the space in the valve body is a narrow passage, and the oil strainer arranged in the passage needs to be configured so as to reduce the flow passage resistance. Therefore, it is conceivable that the oil strainer has a three-dimensional structure to have a large filtration area.

However, if the mesh of the oil strainer is made into a three-dimensional structure, it is necessary to form a rod-shaped portion in the direction of the flow path to support the mesh, and therefore, from the gap due to the friction of the mesh between the mesh and the rod-shaped portion. There is a problem such as leakage of foreign matter and reduction of filtration area due to joining of the annular portion and the mesh.

Therefore, an object of the present invention is to provide a method for manufacturing an oil strainer having a wide filtration area, a small flow passage resistance, excellent rigidity, and a simple structure which can be arranged in a narrow passage.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention comprises a frame body and a net-like body arranged on the inner peripheral side of the frame body, and is provided with an opening portion to the separator plate side. In an oil strainer for an oil passage in a valve body, which is arranged in a valve body forming a space whose diameter is successively larger than a diameter of a bottom portion where an inlet is formed, the frame body is located on the bottom inlet side of the space. An annular portion provided, a rod-shaped rib connected to the annular portion and extending toward the opening side on the separator plate side, and a top portion for connecting the rod-shaped rib on the opening side, The outer peripheral surface is slidably fitted to a cylindrical inner peripheral surface formed on the bottom inlet side of the space of the valve body and the bottom flow of the cylindrical inner peripheral surface of the valve body. Formed at the end on the inlet side A columnar shape of the valve body that has an end surface that is brought into contact with the locking portion, and the top portion is fitted to the outer peripheral surface of the annular portion at a distance from the separator plate that is disposed on the opening side of the space. It is characterized in that it is arranged so as to be smaller than the axial length of the inner peripheral surface of.

Further, in the method for manufacturing an oil strainer for an oil passage in a valve body of the present invention, a plurality of rod-shaped portions in which an outer peripheral side has an annular portion at one end and a disc-shaped portion at the other end, which are fitted in the oil passage, are provided. An oil strainer for an oil passage in a valve body is characterized in that a mesh-like body covering the entire gap except the inside of the annular portion of the frame is fixed to the frame body connected to each other. Synthetic resins having melting point temperature differences of A and B
The mesh made of synthetic resin B having a higher melting point temperature is supported so as to be fitted into the outer side of the inner cylindrical inner die having the concave portion for the rod-like portion of the frame body in a cylindrical shape, and further inside A frame body mold in which an inner cylindrical outer mold having a recess for a rod-like portion of a frame corresponding to the mold is externally fitted, sandwiched between the inner and outer molds, and then formed between the inner and outer molds. The synthetic resin A having a lower melting point temperature is made into a fluid state and poured at a temperature not higher than the melting point temperature of the synthetic resin B into the space.

[Operation and Effect] The oil strainer for an oil passage in the valve body of the present invention is
The frame has an outer peripheral surface that is slidably fitted to a cylindrical inner peripheral surface formed on the bottom inlet side of the space of the valve body and a bottom inner inlet surface of the cylindrical inner peripheral surface of the valve body. A valve body in which a gap between an annular portion having an end surface abutting against a locking portion formed at the end portion and a separator plate disposed on the opening side of the space fits the outer peripheral surface of the annular portion. Since it has a top portion which is arranged so as to be smaller than the axial length of the cylindrical inner peripheral surface of, the oil strainer can be easily placed in a space where the diameter of the opening portion is successively larger than the bottom portion, and The sliding portion ensures the seal, and the foreign matter does not leak and can be collected by the strainer, so that all the oil can flow through the mesh-like body arranged on the inner peripheral side of the frame. Therefore, the foreign matter in the oil is surely collected by the mesh body,
Sticking of valves located downstream of the flow can be prevented.

Further, the synthetic resin having a melting point temperature difference between the frame body and the net-like body is made of A and B, and the net made of the synthetic resin B having a higher melting point temperature is formed into an inner cylindrical shape having a recess for the rod-like portion of the frame body. The inner and outer dies are fitted to the outer side of the inner die so as to be fitted in a cylindrical shape and further fitted with the outer die of the inner cylindrical shape having a recess for the rod-like portion of the frame body corresponding to the inner die. And then the synthetic resin A having a lower melting point is put into a fluid state in the space of the frame body formed between the inner and outer molds and then poured at a temperature not higher than the melting temperature of the synthetic resin B to form the resin. Due to the manufacturing method of the oil strainer for the oil passage in the valve body having a structure, the oil strainer that is inexpensive, has a low flow resistance, is excellent in rigidity, and can be arranged in the sandwiched passage with a simple structure is most efficiently manufactured. it can.

[Embodiment] Next, the present invention will be described based on an embodiment shown in Figs.

The oil strainer 1 comprises a frame body 2 and a circular tube mesh body 3 fixed to each other. In this embodiment, the frame body 2 is made of nylon and the mesh body 3 is made of Tetron.

The frame 2 is formed by connecting an annular portion 5 at one end where the outer peripheral surface 4 fits into an oil passage and a disc-shaped portion 6 at the other end, by four ribs 7 arranged in a circumferential shape. The net-like body 3 is embedded in and fixed to the frame body 2 in a circumferential shape passing through the rod-shaped ribs 7 so as to surround the gap on the outer peripheral side except the annular portion inner side 8 of the frame body 2. A rod-shaped projection 9 is formed on the outer side of the disc-shaped portion 6.

As shown in FIGS. 4 and 5, the oil strainer 1 has a cylindrical space 15 formed on the valve body 10 side of the joint surface 12 of the valve body 10 and the separator plate 11, that is, parallel to the joint surface 12. Oil passage (inlet) 1 that is orthogonal to the oil passage groove 13 and the joint surface 12
It is mounted in a cylindrical space 15 formed in a connecting portion between the oil passages in the valve body 10 such as a connecting portion with 4 and the like. The cylindrical space 15 is formed by a mold,
The diameter of the opening 33 of the separator plate 11 is gradually changed to the bottom 3
It is larger than the diameter of 4.

The frame body 2 includes an annular portion 5 arranged at one end on the side of the inflow port 14 located in the bottom portion 34 of the cylindrical space 15, and the annular portion 5.
And a bar-shaped rib 7 extending toward the other end on the side of the opening 33 on the separator plate 11 side, and a top 30 for connecting the bar-shaped rib 7 at the other end.

The annular portion 5 includes an outer peripheral surface 4 slidably disposed on a cylindrical inner peripheral surface 16 formed on the inlet 14 side of the valve body 10 and a cylindrical inner peripheral surface of the valve body 10. An end surface 32 is provided to be brought into contact with a locking portion 31 formed at the end portion, and the top portion 30 is fitted to the outer peripheral surface 4 of the annular portion 5 at a distance from the separator plate 11 disposed on the opening side of the space. The axial length of the cylindrical inner peripheral surface 16 of the valve body 10 is smaller than the axial length.

As shown in FIG. 4, it can be easily mounted at a position where a fitting portion (cylindrical inner peripheral surface) 16 with the outer peripheral surface 4 of the annular portion of the frame 2 and a surplus space 17 on the outer periphery can be secured.

Next, a related invention of the specified invention will be described based on an embodiment shown in FIGS. 6 to 9.

First, as shown in FIG. 6, a square net 18 made of synthetic resin having a higher melting point temperature, that is, Tetron (2 in the present embodiment).
Of the two nets 18 are fitted onto a cylindrical inner die 20 having a recess 19 for a rod-shaped portion for the frame body 2 in a cylindrical shape so that the joint 21 of the two nets 18 is located in the recess 19. (Press in the vertical direction in the figure). Next, as shown in FIG. 7, a concave portion 22 for the rod-shaped portion of the frame body 2 corresponding to the inner mold 20 is provided.
A pair of outer molds 23, which are divided into two parts, are externally fitted at corresponding positions of the inner mold 20.

Next, as shown in FIG. 8, in the space 24 of the frame 2 formed between the inner and outer molds 20 and 23, synthetic resin having a lower melting point temperature, that is, nylon, is heated to a fluid state. ,
It is poured at a temperature below the melting point temperature of Tetoron, and the nylon 25 in a fluid state is cooled and solidified. Next, inner and outer molds 20, 2
3 is removed and the tension of the net 18 is cut to complete the oil strainer 1 shown in cross section in FIG.

As described above, in the oil strainer 1 for the oil passage in the valve body of the specified invention, the frame body 2 slides on the cylindrical inner peripheral surface 16 formed on the bottom inlet 14 side of the space 15 of the valve body 10. An annular shape having an outer peripheral surface 4 that can be freely fitted and an end surface 32 that abuts on a locking portion 31 formed at the end of the cylindrical inner peripheral surface 16 of the valve body 10 on the bottom inlet 14 side. The distance between the portion 5 and the separator plate 11 arranged on the opening 33 side of the space 15 is determined by the axial length of the cylindrical inner peripheral surface 16 of the valve body 10 fitted to the outer peripheral surface 4 of the annular portion 5. The oil strainer 1 has a top 30 that is arranged to be small.
Is easily placed in the space 15 in which the diameter of the opening 33 is successively larger than the diameter of the bottom 34, and the sliding portion ensures the seal, and foreign matter is collected by the strainer without leaking. The oil can be made to flow through the net-like body arranged on the inner peripheral side of the frame. Therefore, it is possible to reliably collect the foreign matter in the oil by the reticulate body and prevent the stick of the valve located downstream of the flow.

Further, a synthetic resin having a melting point temperature difference between the frame body 2 and the mesh body 3 is made of A or B, and the synthetic resin B having a higher melting point temperature is used.
The net made of metal is supported so as to be fitted into the outer side of an inner cylindrical inner die 20 having a recess 19 for the rod-shaped portion of the frame 2 in a tubular shape, and the frame 2 corresponding to the inner die 20 is supported. The outer cylindrical mold 23 having the concave portion 22 for the rod-shaped part is externally fitted to the space of the frame body formed between the inner mold and the outer mold, and the synthetic resin A having the lower melting point temperature is used. By the manufacturing method of the oil strainer for the oil passage in the valve body, which is configured to be in a fluidized state and poured at a temperature not higher than the melting point temperature of the synthetic resin B, it is inexpensive, has a low flow resistance, is excellent in rigidity, and has a simple structure. An oil strainer that can be installed in a narrow passage can be manufactured most efficiently.

[Brief description of drawings]

FIG. 1 is a plan view of an oil strainer for an oil passage in a valve body according to the present invention, FIG. 2 is a partially cutaway front view thereof, FIG. 3 is a sectional view thereof, and FIG. 4 is a front view showing a mounted state thereof. FIG. 5 is a plan view showing the mounting state, FIG.
FIG. 7, FIG. 8 and FIG. 9 are manufacturing process diagrams thereof. In the figure, 1 ... Oil strainer 4 ... Frame body 3 ... Net body 4 ... Outer peripheral surface 5 ... Annular portion 6 ... Disc-shaped portion 7 ... Rod-shaped rib 10 ... Valve body 11 ... Separator plate 14 …… Oil passage (inlet) 15 …… Cylindrical space 16 …… Mating surface (Cylindrical inner peripheral surface) 17 …… Excess space 20 …… Inner mold 23 …… Outer mold 30 …… Top 31… ... Locking part 32 ... End face 33 ... Opening part 34 ... Bottom part

Claims (3)

[Claims] 1. The diameter of the opening toward the separator plate, which is composed of a frame and a mesh-like member disposed on the inner peripheral side of the frame, is successively larger than the diameter of the bottom where the inlet is formed. In an oil strainer for an oil passage in a valve body, which is disposed in a valve body having a space formed therein, the frame body is an annular portion disposed on a bottom inlet side of the space, and a separator plate connected to the annular portion. Has a rod-shaped rib extending toward the opening side and a top portion connecting the rod-shaped rib on the opening side, the annular portion is formed on the bottom inlet side of the space of the valve body. The outer peripheral surface slidably fitted to the cylindrical inner peripheral surface of the valve body, and the locking portion formed at the bottom inlet side end of the cylindrical inner peripheral surface of the valve body. The end is The space between the separator plate and the separator plate disposed on the opening side of the storage space is smaller than the axial length of the cylindrical inner peripheral surface of the valve body fitted on the outer peripheral surface of the annular portion. The oil strainer for the oil passage in the valve body, which is characterized in that 2. An annular shape of a frame body, which is formed by connecting a plurality of rod-shaped portions, which are arranged circumferentially with an annular portion at one end that fits in an oil passage on the outer peripheral side and a disc-shaped portion at the other end. An oil strainer for an oil passage in a valve body is characterized in that a net-like body covering the entire gap except the inside of the portion is fixed, and an oil strainer for an oil passage in a valve body is made of synthetic resin A, B having a melting point temperature difference between the frame and the net-like body.
The mesh made of synthetic resin B having a higher melting point temperature is supported so as to be fitted into the outer side of the inner cylindrical inner die having the concave portion for the rod-like portion of the frame body in a cylindrical shape, and further inside A frame body mold in which an inner cylindrical outer mold having a recess for a rod-like portion of a frame corresponding to the mold is externally fitted, sandwiched between the inner and outer molds, and then formed between the inner and outer molds. A method for producing an oil strainer for an oil passage in a valve body, characterized in that the synthetic resin A having a lower melting point temperature is made into a fluid state and poured at a temperature not higher than the melting point temperature of the synthetic resin B into the space. 3. The frame body is made of nylon and the reticulate body is made of Tetoron, and by utilizing the difference in melting point temperature between the two, it is heated to the melting point temperature of nylon having a low melting point temperature to be firmly formed. A method for manufacturing an oil strainer for an oil passage in a valve body according to claim 2, wherein