JPH061203Y2 - Oil filter relief valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a relief valve of an oil filter having a holding function and a pressure adjusting function for lubricating oil supplied to the cylinder block side.

[Prior art]

A filter for filtering lubricating oil of an internal combustion engine may be installed in an inverted state due to layout and space.
In such an oil filter, if the supply of lubricating oil is stopped, the oil inside will flow down to the oil pan.
In an internal combustion engine equipped with such an oil filter, the rise in hydraulic pressure immediately after starting is delayed and engine trouble occurs due to insufficient lubrication.

Therefore, an anti-drain valve is provided in the oil passage from the oil filter to the cylinder block to open the valve with hydraulic pressure while the oil pump is operating and close when the pump stops and the hydraulic pressure drops to prevent the oil in the filter from flowing out. There is an invention of Japanese Utility Model Laid-Open No. Sho 60-192209.

The prior art of this publication consists of a piston valve fitted in a cylinder, and the oil pressure on the oil filter outlet side pushes the valve to supply oil to the cylinder block side from the oil outlet opening on the cylinder wall. When stopped, the hydraulic pressure drops, so the piston valve is pushed back by the action of the return spring to close the valve.
Therefore, according to the above-mentioned prior art anti-drain valve, the hydraulic pressure rises easily after the internal combustion engine is started, so that the engine trouble at the time of start due to insufficient lubrication can be prevented.

By the way, the lubricating oil is usually provided with a pressure regulating valve in an oil gallery in order to prevent an abnormal increase in the hydraulic pressure and an accident in the lubricating oil system. Therefore, in an internal combustion engine equipped with an oil filter having a structure in which oil flows out when the oil pump is stopped, the number of valves increases, which increases the manufacturing cost and increases the burden of securing a mounting place, maintenance, and inspection. There's a problem.

[Purpose of device]

The present invention has been made focusing on the above problems,
An object of the present invention is to provide a relief valve for an oil filter, which prevents oil from flowing down in order to rapidly increase the oil pressure when the oil pump is started, and which has a function of adjusting the pressure of lubricating oil during operation of the internal combustion engine. I am trying.

[Constitution of device]

In order to achieve the above object, the relief valve structure of the oil filter of the present invention has a structure in which an oil outlet communicating with the cylinder block is provided at a portion close to the oil inlet of the valve provided in an oil passage communicating with the cylinder block and far An oil return port is provided at the position, and the valve body of the valve is provided with a return spring by opening the oil outlet first and then opening the oil return port by the oil pressure acting on the oil inlet. It is a feature.

By providing the oil outlet and the oil recirculation port as described above, when the oil pressure rises abnormally, the piston valve retracts to the oil recirculation port, and the oil is kept outside the system while continuously supplying the lubricating oil. By discharging the oil to the tank, it acts to suppress an abnormal rise in oil pressure.

The spring constant of the return spring needs to satisfy a value suitable for opening the oil outlet and a value suitable for opening the oil return port. Therefore, it is preferable to change the spring constant between the step of opening the oil outlet and the step of opening the oil return port when the ordinary spring cannot be satisfied. As means for this, for example, two springs are provided, one spring is in contact with the valve body after the oil pressure rises and the oil outlet is fully opened, and a two-stage pitch spring is used. However, the present invention is not limited to this. Not done.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings by an embodiment implemented using a piston valve.

FIG. 1 is a sectional view of an oil filter equipped with a relief valve of the oil filter of this embodiment. In the figure,
The relief valve 1 is arranged below the oil filter 2. The filter element 3 of the oil filter 2 is
It is arranged on a cylindrical mount 5 of the filter body 4. Reference numeral 6 is a fin-shaped filter element positioning member that is provided on the wall surface of the mount 5.

The relief valve 1 is arranged at the lower end of a cylindrical mounting base 5, and a cylindrical piston valve 8 is fitted inside a cylinder 7. A large-diameter spring 9 and a small-diameter spring 10 are concentrically arranged in the piston valve 8, and the spring 9 is in contact with the lower end of the cylindrical portion of the piston valve 8 and constantly pushes the valve 8 upward. Spring 10
Is fitted in the cylinder of the piston valve 8, and the upper end 11 is
Normally, it is separated from the ceiling 12 of the piston valve 8, and the valve 8
When the is lowered to the lower end of the oil outlet 16, the two come into contact with each other.

The oil inlet 15 of the relief valve 1 is a cylindrical mount 5.
Is opened at the bottom of the cylinder, and the oil outlet 16 is opened at the cylinder wall immediately below it to supply oil to a cylinder block (not shown). The oil return port 17 is further opened in the cylinder wall therebelow. The oil passage 18 opened at the lower end of the cylinder 7 serves to prevent the back pressure of the valve 8 from rising. The recirculation port 17 and the oil passage 18 communicate with an oil recirculation passage 19, from which oil is recirculated to an oil pan (not shown).

The lubricating oil is supplied from the oil hose attachment port 20 through the oil passage 21 and the filter element 3 to filter contaminants, and then flows down from the inside of the element 3 into the attachment base 5. Reference numeral 22 is a detachable cover, and 23 is an oil discharge passage when the cover 22 is removed.

Next, the operation of the relief valve 1 of the present embodiment will be described with reference to FIGS. 2 and 3 in which the oil inlet 15, the oil outlet 16 and the oil recirculation port 17 are enlarged.

When the oil pump (not shown) starts operating, the filter 2
When the internal oil pressure rises and becomes larger than the force of the spring 9, as shown in FIG. 2, the piston valve 8 is pushed down so that the oil inlet 15 and the oil outlet 16 communicate with each other. Will be supplied to.

Next, when the oil pressure rises for some reason, the piston valve 8 is further pushed down so that the free end 11 of the spring 10 comes into contact with the ceiling portion 12, and the two springs 9 and 10 oppose the oil pressure. Like When the oil pressure further rises, the valve 8 is pushed down, the oil recirculation port 17 communicates with the oil inlet 15, and the oil also flows into the oil recirculation passage 19.

When the oil flows into the oil recirculation passage 19, the oil pressure is reduced accordingly, so that the piston valve 8 is raised and the oil recirculation port 17 is closed to prevent further pressure reduction. Therefore, the pressure regulating valve conventionally provided in the oil gallery can be eliminated.

Since the dynamic pressure disappears when the oil pump stops, the force of the spring 9 causes the piston valve 8 to close the oil outlet 15 and trap the oil in the oil filter 2. Therefore, when the oil pump is operated next time, the oil pressure can be immediately increased, and an accident due to insufficient lubrication can be prevented.

[Effect of device]

As described above, in the relief valve of the oil filter of the present invention, the oil outlet communicating with the cylinder block is provided at a portion near the oil inlet of the valve provided in the oil passage communicating with the oil filter, and the oil return port is provided at a distant position. Since the valve body of the valve is provided with a return spring by opening the oil outlet first and then opening the oil return port by the oil pressure acting on the oil inlet, an oil pump is used. If not, the oil can be retained in the oil filter, and when the pump starts operating, the oil outlet is opened to supply the oil to the engine block side. Since it is possible to move and regulate the pressure, one valve can serve as both the anti-drain valve and the pressure regulating valve. Effect that contributes to the realization of a simple construction and efficient maintenance work What can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view showing the entire structure of the relief valve of the embodiment, FIG. 2 is an enlarged sectional view of an essential part showing a state in which circulating oil is being supplied, and FIG. 3 shows a state in which an oil return port is opened. It is a principal part expanded sectional view. 1 ... Relief valve, 2 ... Oil filter, 7 ... Cylinder, 8 ... Piston valve, 9, 10 ... Spring, 15 ... Oil inlet, 16 ... Oil outlet, 17 ... Oil return port.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F01M 1/16 B 7443-3G 11/03 A 7443-3G

Claims (3)

[Scope of utility model registration request] 1. An oil outlet communicating with a cylinder block is provided at a portion near an oil inlet of a valve provided in an oil passage communicating with an oil filter from a cylinder block, and an oil return port is provided at a distant position. A relief valve for an oil filter, wherein a return spring is provided so that the oil outlet first opens the oil outlet and then the oil return opening opens by the oil pressure acting on the oil inlet. 2. Two return springs are provided on the valve body,
The relief valve for an oil filter according to claim 1, wherein one of the springs is configured to come into contact with the valve body after the valve body fully opens the oil outlet. 3. A relief valve for an oil filter according to claim 1, wherein a two-stage pitch spring is used as a return spring provided in the valve body.