JPH09225848A - Oil filter wrench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely attach and detach an oil filter. SOLUTION: In an oil filter wrench 1 where the inner periphery of the rising peripheral wall 3a of a dished tool body 3 is shaped in correspondence to an oil filter tip part 21a, and a protruding part 2 for fitting a driving tool 10 such as a ratchet handle or a closed wrench is provided in a central section, strength necessary for loosing a tightly fastened oil filter 21 is given to the protruding part 2, and torque inputted in the protruding part 2 is broken up by an umbrella part 2a and transmitted to the dished tool body 3 to rotate the oil filter 21, and the umbrella part 2a formed unitedly with a steel protruding part 2 is insertedly formed in the dished tool body 3 made of light alloy or fiber reinforced plastic resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil filter wrench for attaching and detaching an oil filter attached to an internal combustion engine such as an automobile.

[0002]

2. Description of the Related Art Replacing an oil filter mounted on an automobile engine is usually 3000 to 5000k.
It is performed every m meters and is the most common work in maintenance shops and gas stations, and the oil filter wrench is frequently used.

Although the shape of the oil filter is a small number but a completely cylindrical shape or a special shape, the majority of the shape of the end portion is a regular polygon of 14 to 17 angles.
There is a difference in the outer diameter of the standard car class between gasoline and diesel cars, but a filter of 65 to 100 mm is used, and it is 1 for large cars (2 to 4 ton class).
An oil filter of about 00 to 130 mm is used.

To install the oil filter, as shown in FIG. 6, the gasket 22 attached to the joint surface 21b at one end of the oil filter 21 is attached to the base surface 2 such as an engine block.
It is supposed to be tightened from 1 rotation to 11/8 rotation after contacting with 3. This is approximately 2 to 3 Kgf-m for ordinary cars and 3 to 4 Kgf for large cars in terms of tightening torque.
-M position.

When the oil filter mounted as described above is replaced, the standard vehicle class is 5 kgf-
It can be loosened in m or less, but 40k in some large vehicles
In many cases, a loosening torque of about gf-m is required.

This is because the gasket 2 is tightened more than necessary in order to prevent oil leakage, and the gasket 2 is several times larger than ordinary cars.
This is due to seizure or sticking of the second base surface 23.

Various oil filter wrenches have been commercialized as tools for turning oil filters. The multi-size type is very convenient, but the thing that can surely work in a small engine room is the compact special dish type like the present invention.

As the dish type oil filter wrench, JP-B-51-14399, JP-B-55-42807 and JP-B-62-15465 have been disclosed and already known.

In Japanese Utility Model Publication No. 51-14399, an inner peripheral surface corresponds to a polygonal shape at one end of an oil filter, and an iron plate is press-molded into a plate shape slightly larger than this, and a ratchet handle or the like is driven in the center. It is an oil filter wrench formed with a fitting hole for engaging a tool.

[0010] Jikkou 55-42807 is Jikkou Sho 51
No. -14399 is reinforced by inserting the fixing material into the recessed part of the driving tool engaging part, and another general strengthening method is an outer shape with a square hole for the driving tool in the center. A product in which a protrusion such as a hexagonal column is welded has already been commercialized.

These iron plate pressed products may be relatively easily deformed when dropped. A relatively large draft is required at the time of pressing, and the fitting with the end of a polygonal columnar filter having a substantially parallel surface tends to be shallow. It takes a lot of cost to weld the parts to reinforce the square hole for the drive tool.
And so on. Although it is possible to solve by increasing the plate thickness, there is a limit to the plate thickness possible in press molding, and measures such as inserting reinforcing ribs are also taken, but until the above problems are solved It didn't reach.

A solution to the above problems is Japanese Utility Model Laid-Open No. 62-15465 as shown in FIG. 3, and an aluminum molding is disclosed in the embodiment. This has the advantages that it is difficult to deform when dropped, fits well with the filter, does not require welding of the reinforcing member, and can be lightened.

However, the integrally molded aluminum product is not perfect and has the following drawbacks. As mentioned above, for some large vehicles, 40 kgfm to loosen the filter.
Some require as much torque. At such a time, as shown in FIG. 5, stress concentrates on the four corners 11b of the drive tool 10 and the corresponding square holes 2b on the oil filter wrench side, which causes the depression 6 to be formed. There is a problem that the filter wrench cracks around the fracture surface B shown in FIGS. 4 and 5.

Further, there are some types of vehicles that must work from an oblique direction because the work is performed in a narrow engine room. At times, remote control using a joint such as an extension bar may be necessary. Further, as described above, a large torque may be required to loosen it. When the above-mentioned adverse conditions are overlapped, it is very difficult to apply a torque only to the force for rotating the filter, and a lateral twisting force is often applied to the oil filter wrench. In such a case, sometimes the protruding portion has a fracture surface A in FIG.
There was a problem that it could be stripped from around.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a dish-type oil filter wrench, the oil filter wrench can be securely attached to the oil filter without cracking, peeling off or deformation of the protruding portion. It is an object of the present invention to provide a dish-shaped oil filter wrench that fits in a rail and does not slip, and is light.

[0016]

In order to achieve the above object, the present invention has an inner peripheral surface of a standing peripheral wall 3a of a dish type tool main body 3 having a shape corresponding to an oil filter tip 21a and having a ratchet at the center. In an oil filter wrench provided with a protrusion 2 for fitting a driving tool 10 such as a handle or a box wrench, a protrusion made of carbon steel or alloy steel for mechanical structure having mechanical strength higher than that of a dish type tool body 3. The present invention proposes an oil filter wrench 1 characterized in that a protruding umbrella portion 2a which is integrally formed with 2 is insert-molded into a dish type tool body 3 made of a light alloy or a reinforced plastic resin.

[0017]

According to the present invention, the inner peripheral surface of the standing peripheral wall 3a of the dish type tool body 3 is shaped to correspond to the oil filter tip portion 21a, and the driving tool 10 such as a ratchet handle or a box wrench is provided in the center portion. Projection 2 for fitting the
In the oil filter wrench 1 provided with, the protrusion 2 has the strength required to loosen the oil filter 21 that is tightly tightened, and the rotational force input to the protrusion 2 is dispersed by the umbrella 2a. To the die tool body 3,
The oil filter 21 is thereby rotated, and the umbrella portion 2a integrally formed with the steel protrusion 2 is insert-molded into the dish type tool body 3 made of a light alloy or a reinforced plastic resin.

The projecting portion 2 is provided with a square hole 2b in the center for fitting a driving tool 10 such as a ratchet handle, and a hexagonal wrench or a spanner wrench is provided on the outside in consideration of the use of the driving tool 10. 2c is provided.

The projecting portion 2 and the umbrella portion 2a formed integrally therewith are made of carbon steel or alloy steel for mechanical structure having mechanical strength higher than that of the dish type tool main body 3 in order to secure sufficient strength. Has been heat treated.

The umbrella portion 2a is a portion for transmitting the rotational force input by the driving tool 10 to the standing peripheral wall 3a of the dish-shaped tool body 3, and by making the outer diameter of the umbrella portion larger than the outer circumference of the projecting hexagonal portion, the rotational force is increased. Is dispersed in a wide range of dish type tool bodies 3.

The inner peripheral surface of the standing peripheral wall 3a of the dish type tool main body 3 corresponds to the shape of the outer peripheral portion of the oil filter tip portion 21a, and is slightly larger than the oil filter 21.

When the oil filter wrench 1 configured as described above is used to rotate the oil filter 21, the force input by the driving tool 10 is applied from the square portion 10a at the tip of the driving tool 10 to the rectangular hole of the oil filter wrench. 2b is transmitted. The rotational force is transmitted while being dispersed from the square hole 2b to the umbrella portion 2a, and to the dish type tool body 3 and the standing peripheral wall 3a thereof.

As described above, since the rotational force externally input by the driving tool 10 is dispersed on the outer circumference of the umbrella portion 2a, the dish-shaped tool body 3 does not require as much strength as the protruding portion 2, and is light alloy or reinforced. A plastic resin can be used.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, 1 is an oil filter wrench,
It consists of a protrusion 2 and a dish-shaped tool body 3.

The protrusion 2 has a square hole 2 for engaging a driving tool at the center.
b and a driving tool engaging portion provided with a hexagonal portion 2c are provided, and the umbrella portion 2a is integrally formed. The umbrella portion 2a has an outer diameter larger than that of the circumscribing circle for the hexagonal portion 2c, so that the outer peripheral shape of the umbrella portion 2a is a gear shape as shown in FIG. I am doing it. The material used is carbon steel for machine structural use or alloy steel, which has been heat treated.

The dish-shaped tool body 3 has an upright peripheral wall 3a whose inner peripheral surface corresponds to the oil filter tip portion 21a, and is slightly larger than the outer periphery of the oil filter 21. In FIG. 4, the standing inner peripheral surface has a regular polygonal shape of 15 angles, but it may have a number of corners or a shape corresponding to a corresponding oil filter. In addition, as shown in FIG.
The plurality of concave portions 3b on the outer peripheral surface of a are to be caught by a finger when the oil filter wrench 1 is directly turned by hand.

As a material for the dish-shaped tool body 3, a light alloy or a reinforced plastic resin is used for weight reduction. For light alloys,
There are various alloys such as aluminum alloys, zinc alloys and magnesium alloys. In particular, aluminum alloys are lighter in weight and have better tensile strength than other light alloys, and are suitable for the material of the dish type tool body.

As a concrete insert molding method using a light alloy, a die casting method is used. The die casting method has a lower casting temperature than other casting methods, and insert processing can be performed without significantly changing the mechanical properties of the steel projections.

It is also possible to insert-mold the plate-shaped tool body 3 by using a reinforced plastic resin reinforced with glass fiber or the like.

In the use of the present invention having the above-mentioned structure, the standing peripheral wall 3a of the dish type tool body 3 is fitted to the oil filter tip portion 21a, and the driving tool 10 such as a ratchet handle is fitted in the square hole 2b or the hexagonal portion 2c. By engaging with and rotating the oil filter wrench 1, the oil filter can be securely attached and detached.

[0031]

As described above, according to the present invention, the protruding umbrella portion 2a formed integrally with the protruding portion 2 made of carbon steel or alloy steel for mechanical structure having mechanical strength higher than that of the dish type tool body 3 is provided.
Is insert-molded into the dish type tool body 3 made of a light alloy or a reinforced plastic resin, so that the oil filter wrench 1 itself adheres tightly to the oil filter 21 to prevent slipping, is lightweight and has good workability. Crack of
The projecting portion 2 can be peeled off and is not damaged by deformation or the like, and the work can be easily performed even in a narrow place. As described above, the structure is simple but effective.

[Brief description of drawings]

FIG. 1 is a diagram showing a usage state of the present invention.

FIG. 2 is a partial cross-sectional view of the present invention.

FIG. 3 is a plan view of a protrusion of the present invention.

FIG. 4 is a partial cross-sectional view showing a conventional example in which the entire oil filter wrench is integrally molded.

FIG. 5 is a view showing a damaged state in a conventional example in which the entire oil filter wrench is integrally molded.

FIG. 6 is an enlarged view of a protruding portion showing a phenomenon of cracking in a conventional example in which the entire oil filter wrench is integrally molded.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Oil filter wrench 6 Depression part 2 Projection part 10 Driving tool 2a Umbrella part 10a Square part 2b Square hole 10b Corner 2c Hexagonal part 21 Oil filter 3 Plate type tool body 21a Tip part 3a Standing peripheral wall 21b Joining surface 3b Recess 22 Gasket 4 Fracture surface A 23 Base surface 5 Fracture surface B

Claims (2)

[Claims] 1. A standing peripheral wall (3a) of a dish type tool body (3).
In the oil filter wrench (1), the inner peripheral surface of which is formed into a shape corresponding to the oil filter tip (21a), and the protrusion (2) for fitting the driving tool (10) is provided in the center. And an umbrella portion (2a) integrally formed with a protrusion (2) made of carbon steel or alloy steel for machine structure is joined to a dish type tool body (3) made of a light alloy by insert molding. Oil filter wrench to be. 2. The oil filter wrench according to claim 1, wherein the dish type tool body (3) is made of a reinforced plastic resin.