JP2797463B2 - Oil filter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an oil filter for removing sludge, metal powder and the like contained in lubricating oil of an internal combustion engine.

[Related Art] Conventionally, there is an oil filter provided with a relief valve near an oil inlet.

In this oil filter, as shown in FIG. 4, a hollow cylindrical excess element 101 is accommodated in a casing 100, and an oil inlet 102 is provided at an open end of the casing 100.
And a cover plate 104 having an outlet 103 formed therein.

The relief valve 105 prevents the oil flow rate in the oil circuit from decreasing when the oil flow resistance of the excess element 101 increases, and is provided between the excess element 101 and the inflow port 102.

On the outer periphery of the relief valve 105, a check valve 106 for sealing the space between the relief valve 105 and the excess element 101 in a liquid-tight manner and preventing the oil in the casing 100 from flowing backward and flowing out from the inlet 102 is provided. It is installed.

On the outer periphery of the outlet 103, an annular seal member 107 for sealing the space between the relief valve 105 and the cover plate 104 in a liquid-tight manner is mounted.

[Problems to be Solved by the Invention] However, in the above-described conventional oil filter, since the relief valve 105 is provided near the oil inlet 102, the upstream side and the downstream side of the relief valve 105 are kept liquid-tight. For this purpose, two sealing parts, a check valve 106 and a sealing member 107, are required.

As a result, the number of parts increases and the structure becomes complicated, so that there is a problem that the assemblability is poor and the manufacturing cost is high.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide an oil filter which aims to improve the assemblability and reduce the cost by reducing the number of parts and simplifying the structure.

Means for Solving the Problems In order to achieve the above object, the present invention provides a tubular casing, one of which is closed, a filter housed in the casing, and an unfiltered oil in the casing. An inflow port for inflow and an outflow port for outflow of the oil filtered by the filter are formed, and a cover plate disposed at an open end of the casing is provided between the filter and the cover plate. A housing having an opening for allowing oil to escape from the upstream side of the filter to the downstream side of the filter by bypassing the filter, and disposed on the downstream side of the opening to open and close the opening. And a check valve disposed downstream of the inlet to prevent oil flowing in from the inlet from flowing out of the inlet. An oil filter, wherein the check valve is made of an elastic member, and a seal portion that is sandwiched between the housing of the relief valve and the cover plate and that seals the both in a liquid-tight manner is provided integrally, and As a technical means, the periphery of the opening is liquid-tightly sealed to the housing, and a communication hole through which the relief oil passes through the opening is formed.

[Operation and Effect of the Invention] In the oil filter of the present invention having the above-described configuration, the check valve is provided integrally with the seal portion, and the seal portion is sandwiched between the housing of the relief valve and the cover plate. Is sealed in a liquid-tight manner. In addition, the check valve is formed with a communication hole through which the relief valve passes through the opening, so that the periphery of the opening can be liquid-tightly sealed with respect to the housing of the relief valve. Therefore, it is not necessary to provide the relief valve with a sealing function.

As described above, since one part (check valve) can seal a plurality of places, the number of parts can be reduced as compared with the conventional product, and the structure can be simplified to improve the assemblability, and the manufacturing cost can be reduced. It is possible to plan.

Example Next, an oil filter of the present invention will be described based on an example shown in the drawings.

 FIG. 1 is a one-side sectional view of an oil filter.

The oil filter 1 of this embodiment has one side (the upper side in FIG. 1).
A hollow cylindrical excess element (body of the present invention) 5 whose both ends are supported by end plates 3 and 4 is accommodated in a cup-shaped casing 2 closed only at its open end. A cover plate 6 having an oil inlet 6a and an oil outlet 6b is provided.

The excess element 5 is mounted on the outer periphery of a cylindrical protector 7 having a large number of oil outlets 7a formed on the wall, and a spring 8
Is pressed and supported.

At the center of the cover plate 6, a female screw 6c for screwing the oil filter 1 to an engine block (not shown) is formed, and an inner peripheral portion of the female screw 6c allows the oil passed by the excess element 5 to flow out. It is configured as an outflow port 6b for causing the air to flow.

The oil inlet 6a is formed at six locations on the outer periphery of the outlet 6b.

The cover plate 6 is supported by the casing 2 by an annular plate 9 fixed to the outer surface of the cover plate 6 by welding or the like wound around the open end of the casing 2. A gasket 10 is mounted near the outer periphery of the plate 9 to seal the space between the plate 9 and the engine block in a liquid-tight manner.

Between the excess element 5 and the cover plate 6,
A relief valve 11 for preventing the oil flow rate in the oil circuit from decreasing when the oil flow resistance of the excess element 5 increases.
Is provided.

The relief valve 11 has a plurality of openings 12a in the circumferential direction.
A relief valve housing 12 formed with an opening 12a
And an annular gasket 13 provided to open and close the opening 12a in response to a pressure difference between the upstream and downstream of the excess element 5.

The relief valve housing 12 is fixed to one end plate 4 on the outer periphery of the protector 7, and an opening 12a and an oil outlet 7b formed at an end of the protector 7 on the cover plate 6 side are provided in communication with each other. Have been.

An annular check valve 14 is disposed between the relief valve 11 and the cover plate 6 to prevent the oil flowing into the casing 2 from flowing backward and flowing out from the inlet 6a.

The check valve 14 is made of, for example, rubber, is fitted on the outer periphery of the outflow port 6b, and the inner peripheral portion thereof is sandwiched between the relief valve housing 12 and the cover plate 6, whereby the check valve 14 is It functions as a seal portion 14a for keeping the upstream side and the downstream side liquid-tight.

The outer peripheral side of the check valve 14 has its tip end abutting on the outer peripheral side from the inflow port 6a of the cover plate 6, and the relief valve housing
The outer peripheral side of the opening 12a of the valve 12 functions as a valve element 14b that opens and closes a gap between the relief valve housing 12 and the cover plate 6.

As shown in FIGS. 2 and 3, the check valve 14 has a communication hole 14 through which relief oil passes.
A large number (for example, 16) of c are formed in the circumferential direction. 2 is a plan view of the check valve 14, and FIG. 3 is a sectional view of the check valve 14.

As shown in FIG. 3, the communication hole 14c is provided between the outer peripheral surface of the check valve 14 and the cover plate 6 on the inner peripheral side of the check valve 14 inside the seal portion A with the relief valve housing 12. It is provided in a range outside part B. In the present embodiment, the radial width of the communication hole 14c is provided to be substantially the same size as the opening 12a of the relief valve housing 12, and the radial position is at the same position as the opening 12a of the relief valve housing 12. Is provided.

Next, the operation of the oil filter 1 of this embodiment will be briefly described.

The oil flowing into the casing 2 from the inlet 6a by opening the valve body 14b is removed through the excess element 5 to remove sludge and metal powder contained in the oil. The oil flows out from the outlet 6b through the oil outlet 7a (the flow of the oil is indicated by solid arrows in FIG. 1). In this case, the gap between the inner peripheral side of the relief valve housing 12 and the inner peripheral side of the cover plate 6 is liquid-tightly closed by the seal portion 14a of the check valve 14 fitted on the outer periphery of the outflow port 6b. The oil flowing from the inlet 6a does not leak to the outlet 6b side without being passed.

On the other hand, when the oil flow resistance of the excess element 5 increases, the pressure difference between the upstream side and the downstream side of the excess element 5 increases, and when a certain value is exceeded, the relief valve 11 opens.
Therefore, most of the oil flowing from the inlet 6a
As shown by the dashed arrow in the figure, the gasket 13 is pushed up through the communication hole 14c of the check valve 14 and the opening 12a of the relief valve housing 12 and flows into the relief valve housing 12, and then the oil outlet 7b of the protector 7 Through the outlet 6b.

As described above, the check valve 14 of the present embodiment has a sealing function for keeping the upstream and downstream sides of the relief valve 11 liquid-tight, a function for preventing oil from flowing backward, and a function as a relief oil flow passage. It has a combination of That is, the conventional two seal parts, the check valve and the seal member, are integrated to provide the communication hole 14c through which the relief oil passes.

As a result, the number of components can be reduced and the structure can be simplified, so that the assemblability can be improved and the manufacturing cost can be reduced.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention.
FIG. 1 is a one-side sectional view of an oil filter, FIG. 2 is a plan view of a check valve, and FIG. 3 is a sectional view of the check valve. FIG. 4 is a sectional view of a main part of an oil filter illustrating a conventional example. In the figure, 1 ... oil filter, 2 ... casing 5 ... excess element (excess body) 6 ... cover plate, 6a ... inlet 6b ... outlet, 11 ... relief valve 14 ... check valve, 14a …… Seal part 14b …… Valve, 14c …… Communication hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01D 27/10 B01D 35/02 F01M 11/03 F02M 37/22

Claims (1)

(57) [Claims] (A) a cylindrical casing, one of which is closed; (b) a filter body accommodated in the casing; (c) an inflow port through which unfiltered oil flows into the casing; An outlet for discharging the oil filtered by the filter is formed, and a cover plate disposed at an open end of the casing; and (d) provided between the filter and the cover plate; A housing having an opening for allowing oil to escape from the upstream side of the filter to the downstream side of the filter while bypassing the filter, and an opening / closing means disposed downstream of the opening to open and close the opening; And (e) a check valve disposed downstream of the inflow port to prevent oil flowing in from the inflow port from flowing out of the inflow port. Thus, the check valve is made of an elastic member, and a seal portion that is sandwiched between the housing of the relief valve and the cover plate and seals the both in a liquid-tight manner is integrally provided, and the housing is provided on the housing. On the other hand, the oil filter is characterized in that the periphery of the opening is sealed in a liquid-tight manner and a communication hole is formed through the opening to allow the relief oil to pass therethrough.