JPH10328508A - Filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a filter device by forming at least a screw part of a base part side in a screw connection part of the base part to a cap part with a high strength casting member such as steel to reinforce the connected screw part with respect to a filter case composed of a screwed two parts of the base part and the cap part. SOLUTION: A filter device 1 for purifying air or the like for engine combustion holds a filter element 4 inside of the light alloy made filter case 10. The filter case 10 is composed of at least screwed 2 parts of the base part 2 and the cap part 3 and the base part 2 and the cap part 3 are formed to be detachably screwed by the screw parts 6a, 6b. In such a case, at least the screw part 6a of the base part 2 side in the screw parts 6a, 6b of the screw connection part of the base part 2 to the cap part 3 is formed with the steel made casting member 8a. That is, a female screw 6a is formed on a steel ring 8a cased in the screw part 6a of the base part 2 side and as a result, the strength of the screw pats 6a, 6b is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device such as a fuel filter or an air filter for purifying fuel, lubricating oil, combustion air and the like of an engine.
The present invention relates to improvement of durability of a filter device made of a light alloy such as aluminum.

[0002]

2. Description of the Related Art As shown in FIG. 1, an example of the structure of a filter device such as a fuel filter or an air filter for purifying fuel, lubricating oil, combustion air and the like of an engine is provided in a filter case 10 which can be disassembled. In addition, a filter element 4 as a separate part is housed, and the filter element 4 purifies the inside by filtering fluid such as fuel, lubricating oil and air. The fluid to be purified flows from the primary side passage 11 in FIG. 1 through the filter element 4 to the secondary side passage 12 side, and the filter element 4 on the way captures dust and insolubles in the fluid. .

Since the filter element 4 is dirty,
The filter case 10 needs to be replaced periodically and is composed of two parts, a base 2 and a cover 3, which are screwed together as shown in FIG.
Are disassembled and assembled. As shown in FIG. 3, the disassembly and assembly of the filter case 10 are usually performed by inserting a wrench, a wrench, a socket, and The disassembling or assembling operation is performed by loosening or tightening the screw portion 6b of the lid portion 3 screwed to the screw portion 6a of the base portion 2 by turning the detachable work tool 15 such as a wrench. .

[0004]

However, in the recent filter device 1, in order to reduce the weight, the filter case 10 is used.
Since both the base 2 and the lid 3 are made of an aluminum alloy, the threaded portions 6a and 6b are crushed during repeated replacement of the filter element 4 and the sealing ability is reduced. In addition, there is a problem that it is necessary to replace the lid 3 and the cost increases.

When the lid 3 of the filter case 10 is made of an aluminum alloy, the corners of the tool receiving portion 5 into which the attaching / detaching work tool 15 is fitted, such as a hexagonal HEX portion 5, are repeatedly worked. It is crushed and rounded by the tool
Since the cover 15 cannot be fitted, the cover 3 cannot be detached from the base 2 and the filter element 4 cannot be replaced.

The present invention relates to a filter device made of a light alloy such as an aluminum alloy in order to reduce the weight of the filter device. An object of the present invention is to provide a high-performance filter device.

[0007]

According to a first aspect of the present invention, there is provided a filter device for holding a filter element for purifying a fluid in a filter case made of a light alloy such as aluminum. And a lid part comprising at least two parts which are screwed together with a lid part, wherein at least the screw part on the base side of the screwed part between the base part and the lid part is a high-strength cast member such as cast iron or steel. By being formed, the coupling screw portion can be reinforced, and the durability of the filter device can be improved.

[0008] Further, there is provided a filter device comprising a filter element for purifying a fluid in a filter case made of a light alloy such as aluminum or the like, the filter case comprising at least two parts to which the filter case is screwed. The tool receiving portion to which the detachable work tool fits during disassembly is formed of a high-strength cast member such as cast iron or steel, so that the strength of the tool receiving portion to which the detachable work tool fits is increased to cover Can be improved in durability.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a filter device according to the present invention in a filter case 10 made of a light alloy such as aluminum.
The filter case 4 has a structure for holding a filter element 4 for purifying fuel, lubricating oil, combustion air, and the like. The filter case 10 includes at least two portions of a base 2 and a lid 3 that are screwed together. 2 and lid 3 are screwed 6a, 6
It is screwed at b to be detachable.

[0010] At least the threaded portion 6a of the threaded portion 6a, 6b of the threaded portion between the base 2 and the lid 3 of the filter case 10 is formed of a steel casting member 8a. That is, the steel ring 8a is cast into the screw portion 6a on the base 2 side, and the female screw 6a is inserted into the steel ring 8a.
To increase the strength of the threaded portion. For example, in the case of a filter device attached to an engine, the base 2 side is a portion attached to the engine.
The lid 3 side is a side that is detached when the filter element 4 is replaced. Also, the base 2 having this cast structure
The screw portion 6a on the side may be a male screw or a female screw. Correspondingly, the screw portion 6b on the side of the lid 3 is formed with a female screw or a male screw.

Further, both the screw portion 6a on the base portion 2 side and the screw portion 6b on the cover portion 3 side may be cast members 8a made of steel. However, when manufacturing costs and replacement costs are considered, Steel member 8a on both base 2 and lid 3
In many cases, replacing the lid 3 is less expensive than casting. Therefore, at least the screw portion 6a on the base 2 side may be formed by a cast member 8a made of steel.

Further, when the filter case 10 is disassembled, the tool receiving portion 5 to which the attaching / detaching work tool 15 is fitted is formed by a cast member 8b made of steel. That is, as shown in FIG. 4, a spanner 15, which is a working tool used for attaching and detaching the tip portion on the side of the lid 3, casts a durable steel ring 8 b into the HEX part 5 to be fitted. Form. Incidentally, reference numeral 7 shown in the figure denotes a drain plug.

The shapes of the detachable work tool 15 and the tool receiving portion 5 with which the detachable work tool 15 is engaged are not particularly limited, and a wrench and a concave square hole as shown in FIG. Inner HEX type may be used. According to the filter device having the above-described structure, at least the filter case 10 of the engagement portions 6a and 6b having a problem in durability.
Is formed by casting a member 8a having excellent durability such as steel, so that the strength of the engaging portions 6a and 6b can be increased. The crushing of the engaging portions 6a and 6b that occur can be prevented, and the durability can be improved.

Further, by reinforcing the screw portion 6a on the base portion 2 side, even if the screw thread 6b which is the engaging portion 6b on the cover portion 3 is crushed and the sealing ability is reduced, only the cover portion 3 is provided. In terms of cost, it is more advantageous to replace the lid 3 than to cast both the base 2 and the lid 3 into a cast structure. Can be product.

Further, the tool receiving portion 5 on the head portion of the lid portion 2 to which the detachable work tool 15 is fitted is connected to the steel member 8b.
Can be prevented from being sharpened, crushed, or rounded even if the detachable work tool 15 is repeatedly fitted, so that the detachable work tool 15 does not become detachable.

[0016]

According to the filter device of the present invention, at least the base side of the filter case, which has a problem in durability, is formed by casting a member having excellent durability such as steel. It is possible to increase the strength of the screw portion, prevent the screw portion from being crushed at the time of repeated use, and improve the durability.

Further, even if the threaded portion on the lid portion is crushed and the sealing ability is reduced by reinforcing the engagement portion on the base portion side, only the lid portion needs to be replaced. This replacement of the lid is more advantageous in terms of cost than having a cast structure on both the base side and the lid. Furthermore, since the tool receiving portion on the head of the lid to which the detachable work tool fits is formed by casting a steel member, even if the detachable work tool is repeatedly fitted, the corners are rounded. Since it is possible to prevent the lid from becoming detached, the durability of the lid can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a filter device according to the present invention.

FIGS. 2A and 2B are views showing a tool receiving portion of a lid portion of the filter device according to the present invention, wherein FIG. 2A is a partial perspective view and FIG.
Is a partial sectional view.

FIG. 3 is a partial perspective view showing another embodiment of the tool receiving portion of the lid of the filter device according to the present invention.

FIG. 4 is a side view showing a filter device.

FIG. 5 is a perspective view showing a disassembled state of a base and a lid of the filter device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Filter device 2 Base 3 Lid 4 Filter element 5 Tool receiving part 6a, 6b Screw part 7 Drain plug 8a, 8b Steel member (casting member) 10 Filter case 11 Primary passage 12 Secondary passage 15 Removal work tool

Claims (2)

[Claims] 1. A filter device comprising: a filter element for purifying a fluid in a filter case made of a light alloy such as aluminum, wherein the filter case comprises at least two parts of a base and a lid which are screwed together. A filter device wherein at least a threaded portion of the threaded portion between the base and the lid on the side of the base is formed of a high-strength cast member such as cast iron or steel. 2. A filter device comprising: a filter element for purifying a fluid in a filter case made of a light alloy such as aluminum, wherein the filter case comprises at least two parts of a base and a lid which are screwed together. A filter device in which a tool receiving portion to which a detachable work tool is fitted when disassembling the filter case is formed of a high-strength cast member such as cast iron or steel.