JPH10148116A - Installation structure of engine oil strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach a synthetic resin-made oil strainer to an oil suction part on an engine side without requiring additional mounting parts, and prevent the looseness of a fastening screw so as to set an appropriate interference. SOLUTION: A mounting hole in the center of an oil strainer 10 is matched to a projected part 6 at the end of a boss 5 so as to house an outer frame in a seat 4, and a bolt 20 with a flange is screwed in a female screw 7 of the boss 5. Then, the end surface of the projected part 6 is fastened as a stopper until the flange seat surface of the bolt 20 with the flange is brought into contact with the end surface of the projected part 6. Hereby, the center frame of the oil strainer 10 is sandwiched by the flange seat surface of the bolt 20 with the flange and the shoulder surface 8 of the base part of the projected part 6, and compressed by an appropriate interference by difference between the thickness of the center frame and the height of the projected part 6, and also the outer frame is tightly stuck and fixed to the seat surface of the seat 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine oil strainer mounting structure for mounting an oil strainer made of a synthetic resin to an oil suction portion of an engine.

[0002]

2. Description of the Related Art Generally, in an engine that pumps oil stored in an oil pan with an oil pump and pressure-feeds the oil to various parts to lubricate sliding parts, it is necessary to remove rough foreign substances contained in the oil in the oil pan. In addition, an oil strainer is provided in the oil suction section.

In recent years, oil strainers made of a synthetic resin have been used in place of metal because the oil strainer is easy to manufacture and is advantageous in terms of cost. Strainer,
If it is directly attached to the engine with bolts or the like, there is a problem that the strength of the attachment portion is not sufficient, so that it is damaged by an excessive tightening torque or the tightening bolt is loosened due to shrinkage due to aging of the resin.

For this reason, some metal parts must be used around the mounting portion. For example, as shown in FIG.
In the disk-shaped synthetic resin oil strainer 52 used in the engine which is simplified by providing the same, the mounting hole 52a at the center of the synthetic resin oil strainer 52 is made of metal as shown in FIG. The ring-shaped spacer 53 is press-fitted, a flanged bolt 54 is passed through the spacer 53, and screwed into a female screw of a boss 51a provided at the center of the oil suction port 51 for mounting.

As shown in FIG. 7, in an oil strainer 55 in which a strainer body 55c is suspended from a mounting flange 55a via a tubular member 55b, similarly, two mounting holes 56, 5
6, ring-shaped spacers 57, 57 made of metal are press-fitted in advance, and bolts 58, 58 with spring washers are passed through the spacers 57, 57, and screwed into female screws around the oil suction portion 59 to be attached. Like that.

Japanese Utility Model Publication No. 6-029451 discloses an oil strainer comprising an L-shaped strainer body made of synthetic resin and a synthetic resin furnace fitted and attached to a lower horizontal portion of the strainer body. An inverted-convex brim provided with a cylinder and an iron plate or a synthetic resin containing a core material and having elasticity, and having a downward boss portion press-fitted into a lower end of a ridge provided at an upper end portion of the strainer body. When fixing it to the suction part on the engine side with three screws,
There has been disclosed a technique for firmly and tightly attaching the suction portion to a suction portion by a spring back action of a collar.

[0007]

However, when a synthetic resin oil strainer is used in combination with a metal spacer or a mounting part such as a steel plate or a synthetic resin collar containing a core material, the number of parts is reduced. With the increase, a press-fitting step of the spacer and the brim becomes necessary, which causes a cost increase.

The present invention has been made in view of the above circumstances, and an oil strainer made of a synthetic resin can be attached to an oil suction portion on an engine side without requiring additional parts for attachment, and loosening of a tightening screw. It is an object of the present invention to provide an engine oil strainer mounting structure capable of preventing the occurrence of an interference and setting an appropriate interference.

[0009]

According to the present invention, an oil suction portion on the engine side is provided with a projection for mounting an oil strainer having at least an attachment portion made of a synthetic resin by a screw member, and the oil suction portion is provided on the oil strainer side. A mounting hole into which the protruding portion is inserted is provided, and the protruding portion serves as a stopper for compressing a peripheral portion of the mounting hole by a set amount to complete the fastening by the screw member.

According to the present invention, when the oil strainer having at least the mounting portion made of a synthetic resin is mounted on the oil suction portion on the engine side, the mounting hole on the oil strainer side is inserted into the protrusion provided on the oil suction portion for positioning. Then, the oil strainer is fastened by a screw member using the protrusion as a stopper, and the peripheral portion of the mounting hole is compressed by a predetermined amount to fix the oil strainer.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention.
1 is an explanatory view showing a state before the oil strainer is attached, FIG. 2 is a front view of the oil strainer, and FIG. 3 is an explanatory view showing a state after the oil strainer is attached.

In FIG. 1, reference numeral 1 denotes a cylinder block. The cylinder block 1 communicates with an oil pump (not shown) via an oil gallery 2 at a position below an oil level of oil stored in an oil pan on a side wall of the cylinder block 1. An oil suction port 3 is provided, and a disc-shaped oil strainer 10 made of synthetic resin is mounted on the oil suction port 3 and fixed by a bolt 20 with a flange.

The oil suction port 3 is provided with a circular seat 4 having a predetermined depth for storing the oil strainer 10 at an inlet portion thereof, and a boss 5 is provided from a bottom substantially parallel to a side wall of the cylinder block 1. Is protruding. At the tip of the boss 5, there is provided a cylindrical projection 6 having a small diameter with a step from the outer periphery of the boss 5. At substantially the center, the oil strainer 10 is provided by the flanged bolt 20. Female screw 7 for attaching
Is screwed.

On the other hand, an oil strainer 10 made of synthetic resin
As shown in FIG. 2, a rib 13 connects a circular outer frame 11 and a circular center frame 12 to each other.
A net 14 is integrally formed at a portion surrounded by the ribs 13 and a mounting hole 15 having an inner diameter slightly larger than the outer diameter of the projection 6 of the boss 5 is provided at the center of the center frame 12. I have.

In this embodiment, the oil strainer 10
The outer frame 11 and the center frame 12 are formed in a disk shape having a constant thickness.
On the side, a base shoulder surface (a shoulder surface formed by a step from the boss 5 to the protrusion 6) 8 of the protrusion 6 and a seat surface of the seat 4 are set to be on the same plane, The height from the base shoulder surface 8 to the tip end surface of the projection 6 is set to a height t2 that is smaller than the thickness t1 of the center frame 12 of the oil strainer 10 by a set amount that gives an appropriate interference. I have.

In order to attach the oil strainer 10 to the oil suction port 3 provided on the side wall of the cylinder block 1 with the above configuration, first, the oil strainer 1
The outer frame 11 is stored in the seat 4 by aligning the center mounting hole 15 with the protrusion 6 at the tip of the boss 5, and then the bolt 20 with the flange is screwed into the female screw 7 of the boss 5. Then, by tightening until the flange seating surface of the flanged bolt 20 comes into contact with the distal end surface of the protrusion 6 using the distal end surface of the projection 6 as a stopper, as shown in FIG. Installation to the is completed.

Accordingly, the center frame 12 of the oil strainer 10 is sandwiched between the flange seating surface of the flanged bolt 20 and the base shoulder surface 8 of the projection 6, and the thickness of the center frame 12 is reduced.
The outer frame 11 is fixed in close contact with the seating surface of the seat 4 by the difference between the height t2 of the protrusion 6 and the height t2 of the protrusion 6, and the oil stored in the cylinder block 1 is removed by the oil strainer 10 Only pass through the net 14.

That is, when the oil strainer 10 is mounted, the positioning can be easily performed by the projections 6, and the oil strainer mounting portion is not tightened more than necessary. Can be.

Further, since a metal spacer or the like is not required for mounting the synthetic resin oil strainer, the step of press-fitting the spacer or the like can be omitted, and further, it is not necessary to secure a press-fitting allowance. The strainer itself can be made thinner, and the total cost can be reduced while ensuring reliability.

FIG. 4 relates to a second embodiment of the present invention.
It is explanatory drawing which shows the state before attachment of another type of oil strainer.

As shown in FIG. 4, the oil strainer 30 according to the present embodiment
Through which a strainer main body 33 having a net on the lower surface is vertically provided.
Two bolts 35, 3 with spring washers are provided on the lower surface of the oil suction portion 26 where the oil gallery 25 opens.
5 for fixing.

On the lower surface of the oil suction portion 26, cylindrical projections 27, 27 are projected at two places around the opening of the oil gallery 25. Female screws 28, 28 for mounting the mounting flange 31 are screwed.

As in the case of the first embodiment, the height of each of the protrusions 27, 27 is set to a height t4 that is smaller than the thickness t3 of the mounting flange 31 by a set amount. The mounting flange 31 has the above-mentioned 2
Corresponding to the projecting portions 27, 27, mounting holes 34, 34 having an inner diameter slightly larger than the outer diameter of the projecting portion 27 are provided.

When the oil strainer 30 is mounted on the oil suction portion 26, the mounting holes 34 of the mounting flange 31 are aligned with the projections 27, 27, and the bolt 3 with the spring washer is positioned.
5 and 35 are screwed into the female screws 28 and 28 and the projections 27 and 27
Until it touches the tip of

Thus, similarly to the first embodiment, the mounting flange 31 of the oil strainer 30 is connected to the bearing surface of the bolt 35 with the spring washer and the oil suction portion 2.
6 and the mounting flange 31
Is compressed and fixed with an appropriate interference due to the difference between the thickness t3 of the projections 27 and the height t4 of the projections 27, 27.

In this embodiment, as in the first embodiment described above, the oil strainer made of synthetic resin can be fixed with an appropriate interference without requiring additional parts to attach the oil strainer made of synthetic resin. Cost can be reduced.

[0027]

As described above, according to the present invention, when an oil strainer having at least a mounting portion made of a synthetic resin is mounted on the oil suction portion on the engine side, a mounting hole on the oil strainer side is provided in the oil suction portion. In order to fix the oil strainer by fixing the oil strainer by compressing the surrounding area of the mounting hole by a set amount and fixing the oil strainer around the mounting hole, insert additional parts to the oil strainer. An excellent effect can be obtained, for example, it can be fixed with an appropriate interference without requiring, and the total cost can be reduced while ensuring the reliability.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state before an oil strainer is attached according to a first embodiment of the present invention.

FIG. 2 is a front view of the oil strainer according to the first embodiment;

FIG. 3 is an explanatory view showing a state after the oil strainer is attached.

FIG. 4 is an explanatory view showing a state before attaching an oil strainer of another type according to the second embodiment of the present invention.

FIG. 5 is an explanatory view showing a state before an oil strainer is attached according to a conventional example.

FIG. 6 is a front view of the oil strainer in which the spacer is press-fitted.

FIG. 7 is an explanatory view showing a state before mounting an oil strainer of another type according to the first embodiment;

[Explanation of symbols]

 3 ... Oil suction port 6 ... Projection 7 ... Female screw 10 ... Oil strainer 15 ... Mounting hole 20 ... Bolt

Claims (1)

[Claims] At least one mounting portion is provided at an oil suction portion on an engine side for mounting an oil strainer having at least a mounting portion made of a synthetic resin with a screw member, and the mounting portion is inserted into the oil strainer side. A mounting structure for an oil strainer for an engine, wherein a hole is provided, and the projecting portion serves as a stopper for compressing a peripheral portion of the mounting hole by a set amount to complete fastening by the screw member.