JP2007160159A - Cap of element exchange type filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a cap 4 ensuring largely an engaging length of a polygonal portion 18 with a jig, and prevent a pooling of rain water. <P>SOLUTION: A cylinder type cap 4 with bottom is detachably attached to a housing to constitute a filter chamber accommodating an element. The cap 4 is molded from a synthetic resin, and provided with a cylindrical portion 10 and a top surface portion 11. The polygonal portion 18 fitted in the jig is formed on one end of the cylindrical portion 10, and a threaded portion 12 is formed on the other end. An upper end 18a of the polygonal portion 18 is projected upward as compared to a peripheral edge of the top surface portion 11 to produce a recessed portion 21, but makes a tapered surface of the predetermined angle such that a surface 22 is made along with a horizontal line in an inclined mounting pose. Accordingly, the rain water is not pooled. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an element exchange type filter used as an oil filter, a fuel filter or the like of an internal combustion engine, and more particularly to an improvement of the cap.

  For example, as disclosed in Patent Literature 1 and Patent Literature 2 as an oil filter for an internal combustion engine, a housing fixedly provided on a cylinder block or the like of the internal combustion engine and a cap detachably attached to the housing There is known an element exchange type oil filter that constitutes a filter chamber and replaces only a cylindrical filter element accommodated in the filter chamber.

The cap in this element exchange type oil filter generally has a bottomed cylindrical shape, a threaded portion is formed on the outer peripheral surface of one end of the cylindrical portion, and the outer peripheral surface of the other end is formed in a polygonal shape, It is configured to be fitted with a jig for rotation operation.
Japanese Patent Laid-Open No. 10-202015 JP 2004-167295 A

  The cap as described above constitutes a part of the pressure vessel and needs to be firmly tightened and fixed to the housing with sufficient tightening torque. It is desirable to ensure a large length in the direction, that is, a meshing length with the jig.

  On the other hand, in an internal combustion engine mounted in an engine room of an automobile, there are many parts around the oil filter, so it is desirable that the outer dimensions of the cap be smaller.

  Therefore, the present invention is an element-exchangeable filter cap that is detachably attached to a housing that opens obliquely upward, and that forms a filter chamber that houses a cylindrical filter element together with the housing, A polygonal portion that can be fitted to a predetermined jig for rotation operation is provided, and a cylindrical portion that is provided with a screw portion that is screwed into the housing at the other end, and an end portion of the filter chamber is configured. A dome-shaped top surface portion connected to one end of the cylindrical portion, and an end portion of the polygonal portion projects in an axial direction from an outer peripheral edge of the top surface portion. That is, there is a step between the end portion of the polygonal portion and the outer peripheral edge of the top surface portion. And in 1st invention, the taper surface which the surface which connects the edge part of said polygon part and the surface of the said top surface part inclines with respect to the cap center axis line corresponding to the horizontal line in the inclination attitude | position with which it attached to the housing. I am doing.

  With such a configuration, it is possible to ensure a large axial length of the polygonal part while reducing the size of the entire cap by lowering the position of the top surface part. Therefore, a large meshing length with the jig can be obtained when attaching and detaching, and a large tightening torque can be dealt with.

  On the other hand, when the outer peripheral edge of the top surface portion is relatively low with respect to the polygonal portion as described above, water or the like accumulates at the stepped portion, which may cause deterioration due to corrosion or swelling of the cap material. In the present invention, in the state where the cap is attached to the housing that opens obliquely upward, a part of the circumferential direction of the cap is the lowermost part, but the end of the polygonal part and the surface of the top surface part are The connecting surface is a surface along the horizontal line (or a surface inclined further outward) in the inclined posture attached to the housing, and water or the like does not accumulate.

  In the second invention, the end portion of the polygonal portion also projects in the axial direction from the outer peripheral edge of the top surface portion, and a plurality of notches are provided in the projecting portion. Therefore, in this case, when the cap is attached to the housing in an inclined posture, water or the like collected at the step between the outer peripheral edge of the top surface portion and the polygonal portion is discharged through the cutout portion and does not accumulate. .

  According to the present invention, since the position of the top surface portion is lowered and the cap becomes a small cap, for example, in an engine room where a large number of parts are densely arranged, there are fewer layout restrictions. At the same time, the engagement length of the polygonal part with the jig can be ensured to be large and can be securely fixed with a large tightening torque. And water etc. do not accumulate in a level | step-difference part, but deterioration of the material by this can be avoided.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. This embodiment is applied to an oil filter of an internal combustion engine for automobiles, and a substantially cylindrical oil filter housing 1 is integrally formed as a part of a bracket 2 by, for example, aluminum alloy die casting, The bracket 2 is attached to a side surface of a cylinder block (not shown) so as to be connected to the lubricating oil path of the engine. The housing 1 is open at one end in the axial direction of the cylinder, and has an internal thread portion 3 formed on the inner peripheral surface of the opening. In particular, as shown in the figure, the housing 1 is arranged in the internal combustion engine with a posture inclined, for example, by about 45 ° so that the opening surface is inclined upward.

  A cap 4 having a bottomed cylindrical shape is detachably attached to the female screw portion 3, thereby forming a filter chamber 6 in which a cylindrical filter element 5 is accommodated. Therefore, it is possible to replace only the filter element 5 by removing the cap 4. In addition, the said filter element 5 is hold | maintained between the latching claw 7 inside the cap 4, and the pipe part 8 of the filter chamber 6 center, and lubricating oil flows through to radial direction.

  FIG. 2 is a half sectional view showing the cap 4 alone, and FIG. 3 is a top view thereof. The cap 4 is, for example, injection-molded with a high-stiffness synthetic resin such as a polyamide resin blended with glass fiber, and has a cylindrical portion 10 having a cylindrical shape with a diameter substantially equal to that of the housing 1 described above. The top surface portion 11 connected to the upper end of the tubular portion 10 is roughly configured. The top surface portion 11 constitutes an end portion of the filter chamber 6 serving as a pressure vessel, and has a shape that bulges outward as a whole in order to ensure pressure resistance.

  On the outer peripheral surface of the lower part of the cylindrical part 10, a screw part 12 that is screwed into the female screw part 3 is formed. An O-ring mounting groove 15 sandwiched between the two land portions 13 and 14 is formed adjacent to the upper end of the screw portion 12, and an O-ring 16 is disposed here. As shown in FIG. 1, the O-ring 16 seals a space between the inner peripheral surface of the opening of the cylindrical housing 1.

  Further, the outer peripheral surface of the upper end portion of the tubular portion 10 is formed as a regular polygon (for example, a regular 14-sided) polygonal portion 18 that fits into a predetermined jig for rotating operation. A circular flange portion 19 protruding in the radial direction is provided at the base portion of the polygonal portion 18, and the flange portion 19 and the upper land portion 13 are adjacent to each other with a narrow gap. In addition, this flange part 19 press-contacts to the front end surface of the opening part of the housing 1 in the attachment state.

  Here, the upper end portion 18 a of the polygonal portion 18 protrudes relatively in the axial direction from the outer peripheral edge of the dome-shaped top surface portion 11. Accordingly, when viewed as a single unit of the cap 4, a recessed portion 21 that is slightly recessed is formed on the inner peripheral side of the outer polygonal portion 18, and the recessed portion 21 continues in an annular shape over the entire periphery. A surface 22 connecting the concave portion 21 and the upper end portion 18 a of the polygonal portion 18 forms a tapered surface inclined with respect to the central axis of the cap 4. In particular, the inclination of the tapered surface 22 is set in consideration of the posture when the cap 4 is attached, specifically, the posture with respect to the horizontal line. Specifically, the surface 22 is set at least along the horizontal line in the lowermost portion in the circumferential direction of the polygonal portion 18 in the mounting posture. In addition, you may incline slightly so that the outer peripheral side of the surface 22 may become relatively downward. Therefore, in the mounting posture, the concave portion 21 is not actually recessed downward.

  FIG. 4 shows a slightly exaggerated shape of the surface 22 in the above mounting posture. As shown in the figure, the cap 4 is mounted in a posture in which the central axis M is inclined from the vertical line V by an angle α. ing. At this time, the surface 22 is set so as not to be relatively recessed with respect to the horizontal line H passing through the upper end of the polygonal portion 18. Therefore, for example, when rainwater drops from above, it does not accumulate here. As shown by the imaginary line 22 ', if the outer peripheral polygonal portion 18 is extended into a wall shape and connected to the outer peripheral edge of the top surface portion 11 as it is, a small amount of rainwater or the like accumulates for a long time. This causes deterioration of the material.

  Therefore, according to the configuration of the above embodiment, the cap 4 can be reduced in size by lowering the position of the top surface portion 11 without causing a new problem such as accumulation of rainwater, and the axis of the polygonal portion 18 can be achieved. A sufficiently large length in the direction can be secured. The jig for rotating the cap 4 is, for example, a bottomed cylindrical jig that has a corresponding polygonal inner peripheral surface and fits on the outside of the cap 4. It is done.

  Next, FIGS. 5 and 6 show a second embodiment of the cap 4. In this embodiment, the upper end portion 18a of the polygonal portion 18 projects relatively in the axial direction from the outer peripheral edge of the dome-shaped top surface portion 11 as in the above-described embodiment. A concave portion 25 that rises in a wall shape and is deeper than the concave portion 21 of the above-described embodiment is formed between the outer peripheral edge of the top surface portion 11. In this embodiment, a notch 26 extending from the recess 25 to the outer peripheral surface is formed on each side of the polygon 18. In addition, since the corner | angular part of the polygonal part 18 receives big force by engagement with a jig | tool, the notch part 26 is arrange | positioned in the center of each side which makes | forms linear form.

  In such an embodiment, as described above, rainwater that has flowed into the recess 25 is quickly discharged through the notch 26 and does not accumulate in a state of being attached to the housing 1 in an inclined posture. According to this embodiment, rainwater does not accumulate even when the cap 4 is attached in a posture close to vertical.

Sectional drawing of the whole element exchange type oil filter provided with the cap concerning this invention. The half sectional view of a cap. The top view of a cap. Explanatory drawing of the cap principal part in an attachment attitude | position. The principal part notch sectional drawing of the 2nd Example of a cap. Similarly, a top view of the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Housing 4 ... Cap 10 ... Cylindrical part 11 ... Top surface part 12 ... Screw part 18 ... Polygon part 26 ... Notch part

Claims (2)

A cap of an element exchange type filter that is detachably attached to a housing that opens obliquely upward and constitutes a filter chamber that houses a cylindrical filter element together with the housing,
A cylindrical portion having a polygonal portion that can be fitted to a predetermined jig for rotating operation at one end, and a screw portion that is screwed into the housing at the other end,
A top surface swelled in a dome shape connected to one end of the cylindrical portion so as to constitute an end portion of the filter chamber;
Consists of
An end portion of the polygonal portion protrudes in an axial direction from an outer peripheral edge of the top surface portion, and a surface connecting the end portion of the polygon portion and the surface of the top surface portion is a horizontal line in an inclined posture attached to the housing. A cap of an element exchange type filter characterized by having a tapered surface inclined with respect to the center axis of the cap. A cap of an element exchange type filter that is detachably attached to a housing that opens obliquely upward and constitutes a filter chamber that houses a cylindrical filter element together with the housing,
A cylindrical portion having a polygonal portion that can be fitted to a predetermined jig for rotating operation at one end, and a screw portion that is screwed into the housing at the other end,
A top surface swelled in a dome shape connected to one end of the cylindrical portion so as to constitute an end portion of the filter chamber;
Consists of
An element-exchangeable filter cap characterized in that an end portion of the polygonal portion protrudes in an axial direction from an outer peripheral edge of the top surface portion, and a plurality of notches are provided in the protruding portion. .

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