JP3434582B2 - Filter device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device,
In particular, the present invention relates to a filter device in which a filter medium is provided in a casing having an inlet and an outlet. 2. Description of the Related Art Conventionally, as this type of filter device, there has been known a filter device shown in Japanese Patent Application Laid-Open No. 4-321864 as shown in FIG. The casing 1 of the filter device is formed by fixing a lower case 2 having an inflow port 2a and an upper case 3 having an outflow port 3a to respective peripheral portions.
A bag-shaped filter medium 4 having an opening 4a is provided inside the casing 1.
And the opening 4 a of the filter medium 4 is fixed to the inflow port 2 a of the lower case 2. In such a configuration, when an oil pump is connected to the end of the outlet 3a and sucked, oil containing dust is sucked into the filter medium 4 from the inlet 2a of the lower case 2 at a predetermined pressure. Only the oil passes through the filter medium 4, but only the dust is filtered, and the filter medium 4 expands due to the resistance when the oil passes through the filter medium 4. The oil that has passed through the filter medium 4 flows out the outlet 3a.
To the outside of the casing 1. [0004] In the above-mentioned conventional filter device, the filter medium 4 and the outlet 3a do not overlap, but when the filter medium 4 is enlarged to increase the filtration area, the flow rate of the filter medium 4 increases. It will overlap the exit 3a. Then, since the filter medium 4 blocks the outlet 3a when the oil flows out, there is a problem that the suction pressure concentrates on the portion and damages the filter medium 4. [0005] The present invention has been made in view of the above problems, and has as its object to provide a filter device capable of increasing the size of a filter medium and not damaging a portion overlapping an outlet. To achieve the above object, according to the first aspect of the present invention, a filter medium is provided in a casing having an inlet and an outlet so as to face the outlet. In the stiffened filter device, the casing is formed with a convex portion bulging outward, and a pipe is passed through the inside and outside of the convex portion to form an outlet, and the peripheral wall of the inside of the convex portion in the pipe is formed on the casing. Thus, the filter medium is configured to support a portion of the filter medium facing the projection. According to the first aspect of the present invention, the casing is formed with a convex portion bulging outward, and the convex portion penetrates the inside and outside of the casing. Pipes are provided for distribution. Therefore, the object to be filtered goes out of the casing through the opening of the projection. Here, the peripheral wall of the inside of the convex portion of the pipe supports a portion of the filter medium facing the convex portion. For this reason, the peripheral wall of the pipe blocks the central portion of the opening surface, and the filter medium is supported by the peripheral wall of the pipe at the central portion even if the filter medium is drawn to the outlet. As described above, according to the present invention, in the convex portion formed on the casing, the peripheral wall of the pipe supports the filter medium, and the filter medium is enlarged so as to face the outlet. Even if is sucked, the filter is supported at the center of the opening corresponding to the same outlet, so that a filter device capable of preventing the filter medium from being damaged can be provided. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an oil filter of an automatic transmission to which a filter device according to an embodiment of the present invention is applied,
Is a bottom view, and FIG. 3 is a perspective view of a filter medium. 1 is a sectional view taken along the line II in FIG. 2, and FIG.
FIG. 3 is a sectional view taken along line I-III. In the drawing, the upper casing 10 and the lower casing 20 having the same outer shape are formed in a dish shape with the peripheral edge portions bent, and further, the abutting surfaces 11 and 21 with the end portions bent in a flange shape are formed. are doing. The lower casing 2
The periphery of the zero contact surface 21 is further bent upward to form a winding allowance 21 a for winding the contact surface of the upper casing 10. A circular inlet 12 is formed in the upper casing 10, and its peripheral edge is cylindrically curved toward the concave side to form a winding margin 12 a. on the other hand,
A part of the lower surface of the lower casing 20 is protruded downward to form a convex portion 22, and a circular through hole 22 a is formed on a side surface of the protruded convex portion 22. And the same through hole 2
A pipe 23 constituting an outlet 23a is airtightly connected to 2a. The tip of the pipe 23 is cut obliquely, and is inserted in parallel from the side surface direction of the convex portion 22 with the long peripheral wall facing upward. In this state, the pipe 23 is inserted toward the inside of the convex portion 22,
The peripheral wall of the pipe 23 closes a part of the opening surface facing the inside of the lower casing 20 in FIG. The filter medium 30 is formed by stamping and molding a nonwoven fabric into a predetermined shape, and then folding the nonwoven fabric. The outer shape of the filter medium 30 except for the fold portion is the contact surface 11 between the upper casing 10 and the lower casing 20. 21. The embossing is carried out by impregnating with phenol, pressing, and curing by heating.
2 are formed. Then, the convex portions 31 and 3 mutually
2, the concave side faces each other and is superposed to form a space inside. An opening 31a into which the winding allowance 12a of the inflow port 12 can be inserted is formed in the convex portion 31 of the filter medium 30. The upper casing 10 and the lower casing 2
0 has several ribs 13 and 24 protruding inward. Next, the operation of the present embodiment having the above configuration will be described. The filter medium 30 is cut into a predetermined shape and three-dimensionally formed through a pressing and heating process. Both filter media 3
When the 0 is folded in two, the outer periphery of the filter medium 30 and the outer periphery of the upper casing 10 coincide with each other on the concave side of the upper casing 10,
The cylindrical winding allowance 12 a in the upper casing 10 is inserted into the opening 31 a of the filter medium 30. After the insertion, as shown in FIG.
0, the periphery of the opening 31a is sandwiched between the winding allowance 12a and the upper casing 10 itself to maintain the airtight. On the other hand, in the lower casing 20, the pipe 23 is inserted into the through hole 22 a of the projection 22. At this time,
The side of the long peripheral wall of the pipe 23 is
When the opening 23 is turned to the side of the opening surface, the opening surface is substantially closed in the middle, and the pipe 23 and the projection 2
2 A flow path to the outlet 23a of the pipe 23 through a gap with the inner peripheral surface is secured. When the filter medium 30 is held by the upper casing 10 as described above, the winding allowance 21a that is erected from the periphery of the contact surface 21 of the lower casing 20
The contact surface 11 of the upper casing is inserted into the inside. Then, the contact surface 21 of the lower casing 20 and the upper casing 10
The periphery of the filter medium 30 is sandwiched between the contact surface 11 and the contact surface 1 of the upper casing 10 in this state.
Press to one side. Then, the upper casing 10 and the lower casing 20 are caulked with the filter medium 30 interposed over the entire periphery, thereby forming an airtight integral casing 40. In the filter medium 30, a side other than the folded one side is sandwiched between the contact surfaces 11, 21 of the upper casing 10 and the lower casing 20, and the convex portions 31, 32 face each other in the opposite direction to form a bag. ing. The convex portion 31
Is connected to the inflow port 12 of the upper casing 10, so that the bag-shaped filter medium 30 is opened in one casing 40 having the inflow port 12 and the outflow port 23a.
Is connected to the inflow port 12 and housed. When a negative pressure is supplied into the casing 40 from the outlet 23 a of the pipe 23 in such a state, the contaminated oil is sucked from the inlet 12 and dust such as iron powder when passing from the inner side to the outer side of the filter medium 30. Is filtered. At this time,
Due to the resistance when oil passes through the filter medium 30, the filter medium 30
However, the ribs 13 and 24 obstruct the ribs, so that the oil retains substantially its original shape, and the oil exudes from the portion of the filter medium 30 facing between the ribs 13 and 24. By the way, the filter medium 30 also tries to expand at the portion of the filter medium 30 facing the opening surface of the projection 22, but the pipe 23 lies inside the projection 22 and
The peripheral wall of the pipe 23 blocks the opening surface. Therefore,
The peripheral wall of the pipe 23 supports the expansion of the filter medium 30 like a rib in the middle of the opening surface, and the filter medium 30 retains the substantially original shape. As a result, the oil seeps out from around the portion of the filter medium 30 that is in contact with the pipe 23, and flows to the outlet 23a of the pipe 23 through a gap between the pipe 23 and the inner peripheral surface of the projection 22. By the way, filter media 3
Since the convex portion 32 at 0 faces the lower casing 20 side, the filtered oil flows out from the outlet 23 a of the pipe 23 via the convex portion 22 as it is. on the other hand,
Since the convex portion 31 of the filter medium 30 faces the side of the upper casing 10, the filtered oil once flows out to the side of the upper casing 10, but flows toward the fold side of the filter medium 30, and 20, and flows out from the outlet 23 a of the pipe 23 through the convex portion 22. As described above, when there is an opening surface of the convex portion 22 serving as a substantial outflow port in the casing, the pipe 23 communicating with the outside is disposed in this opening surface. This is equivalent to arranging a member for supporting the filter medium such as a rib. As a result, even if the filter medium 30 is drawn to the opening surface, it is supported by the peripheral wall of the pipe 23 at the center portion, so that the opening surface is not blocked. In the present embodiment, the pipe 23 whose tip is obliquely cut is adopted as the pipe 23, but the shape of the tip of the pipe 23 in the projection 22 is not limited to this. For example, as shown in FIG. 5, a small hole 2
3b may be formed, or a number of slits 23c may be formed in a rib shape while cutting the tip obliquely as shown in FIG. Further, instead of being inserted into the convex portion 22 from the side direction, the peripheral wall of the portion inserted into the convex portion 22 may constitute a support structure in the opening of the convex portion 22.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an oil filter of an automatic transmission to which a filter device according to an embodiment of the present invention is applied, taken along II in FIG.
It is a line sectional view. FIG. 2 is a bottom view of the oil filter. FIG. 3 is a perspective view of a filter medium. FIG. 4 is a sectional view of the oil filter taken along line IV-IV in FIG. 2; FIG. 5 is a sectional view of an oil filter showing a modification of the pipe. FIG. 6 is a sectional view of an oil filter showing a modification of the pipe. FIG. 7 is a sectional view of a conventional oil filter. [Description of Signs] 10 upper casing 12 inlet 20 lower casing 22 convex part 23 pipe 23a outlet 30 filter medium 31a opening 40 casing

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-256016 (JP, A) Japanese Utility Model 5-28405 (JP, U) Japanese Utility Model 4-37512 (JP, U) Japanese Utility Model Application 3- 26312 (JP, U) Japanese Utility Model Hei 3-21510 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 35/30 B01D 35/02 F16H 57/04

Claims (1)

(57) [Claim 1] In a filter device in which a filter medium is disposed in a casing having an inlet and an outlet so as to face the outlet, the filter is provided with an outer side. An inflated convex portion is formed, and a pipe is penetrated into and out of the convex portion to serve as an outlet, and a peripheral wall of the convex portion inside the pipe supports a portion of the filter medium facing the convex portion. A filter device, characterized in that: