JPS6246054Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present application relates to an improvement of a relief valve used in a filter such as an oil filter.

Oil filters for internal combustion engines use relief valves to bypass oil flow when the filter material becomes clogged.

A conventional relief valve, as shown at 10 in FIG.
A bypass inlet 1 and a bypass outlet 2 are provided in each of the blocking walls, and a coil spring 4 and a ball 5 in contact with the upper end of the coil spring are arranged between each of the blocking walls in the valve body 3. A valve is formed between the ball 1 and the ball 5. The relief valve 10 is disposed integrally with an oil filter of an internal combustion engine, and has an inlet port 1 on the inlet side of the oil filter.
However, it is also used with an outlet 2 connected to the outlet side.

When the oil pressure on the inlet side of the filter increases,
Valve 10 is opened. Therefore, in this type of valve, the oil flows from the outer circumferential side of the coil spring 4, across the coil spring 4, to the inner circumferential side, and further flows to the outlet 2.

The relief valve 10 having such a structure has the advantage that it has an extremely simple configuration and can be directly installed in the pipe inside the oil filter or its adapter. Since it is mounted on the wall, it has the following disadvantages: That is, in a relief valve having such a structure, for example, when the oil temperature is low and the viscosity is high, high oil pressure acts on the ball 5 of the bypass inlet 1 and the valve is fully opened (dashed line in FIG. 1), the coil spring 4 , they become completely contracted and are in close contact. In such a state, the flow of oil flowing in from the bypass inlet 1 is blocked by the fully-tight spring, resulting in a drawback that the bypass action cannot be achieved.

In order to eliminate this drawback, spring 4
It is conceivable to provide a means to limit the amount of compressive deformation of the spring 4 to prevent the spring 4 from coming into close contact with each other, but it is extremely difficult to realize this without obstructing the circulation of the bypass flow and with a simple structure. Have difficulty.

In view of the above, this application has an extremely simple structure,
The purpose of this invention is to provide a relief valve using a coil spring that performs a normal bypass action even when the valve is fully open, and a valve element receiver is provided with a communication path between the coil spring and the valve element. This goal was achieved by doing so.

To illustrate by way of example, FIG. 2 shows a relief valve 20 of the present invention, which includes a valve body 21, a valve element or ball 22, a coil spring 23, and a valve element receiver or ball receiver 24. Bento box 2
1 has a cylindrical shape with closed walls at the upper and lower ends, and each of the closed walls has an inflow opening 25 and an outflow opening 26 for the bypass flow, and a ball 22 and a ball receiver 24 are placed in a chamber 27 between the closed walls. coil spring 23
It is reduced by The coil spring 23 is made by winding a wire spring material into a spiral shape, and each wire annular spring material is usually separated from each other to form a space between them. The ball 22 has a larger diameter than the inlet opening 25 and the two normally contact to form a valve. Coil spring 23 and ball 2
As shown in FIG. 3, the ball receiver 24 provided between the ball receiver 2 and the ball receiver 2 has at least three partition walls 30 on one side of a spherical substrate 29 having a circulation opening 28 in the center. A ball 22 is placed on the partition wall. Further, at the outer peripheral end of the other surface of the substrate 29,
A spring guide 31 is formed, and the upper end of the spring 23 is guided by the spring guide.

FIG. 4 shows an example using another valve element receiver, in which a fan-shaped opening 4 whose outer diameter is larger than the ball diameter is shown.
A ball is placed in the center of a base plate 40 made of a thin plate having a base plate 1, and a coil spring 23 is placed on a spring guide 42 provided on the outer periphery.

FIG. 5 shows an embodiment that does not use a ball as described above, in which a flat plate 43 is used as the valve element, and a valve element receiver 45 having a flow opening 44 is placed below it via a partition wall 46. This is what I did.

The relief valve is used with the inflow opening 25 connected to the inlet side of the oil filter and the outflow opening 26 connected to the outlet side.

In FIG. 2, when oil pressure equal to or higher than a predetermined value is applied to the inflow opening 25 of the valve box 21, the ball 22 is pressed to open the valve, and oil flows into the chamber 27 of the valve box 21. Furthermore, oil is added to the coil spring 2
It reaches the outflow opening 26 through the space formed between each of the annular spring members 3 and is bypassed.

As when oil viscosity increases at low temperatures,
When the valve is fully open and the coil spring 23 is in full contact and the space is not formed in the spring, the oil from the inflow opening 25 passes through the gap formed between the ball 22 and the ball receiver 24, that is, the fluid communication path. There is a bypass from the flow opening 28 to the outflow opening 26 . Similarly, when using the ball receiver of FIG. 4, oil is bypassed through the fan-shaped opening 41 in the base plate 40.

As described above, the relief valve of the present invention has a valve element receiver with a fluid communication path provided between the coil spring and the valve element, so when the valve is fully opened, the coil spring controls the flow of oil. Even if a situation that becomes a barrier occurs, a normal bypass action can be achieved without providing special means to the valve body and complicating its structure.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional relief valve, Figure 2 is a sectional view of the relief valve of the present invention, Figure 3 is a perspective view of the ball receiver in Figure 2, and Figures 4a and b are It is a figure which shows the other Example of a receiver. FIG. 5 is a diagram showing another embodiment of the ball and ball receiver. 21...Valve box, 22...Ball, 23...Coil spring, 24...Ball receiver, 25...Inflow opening, 26...Outflow opening.

Claims (1)

[Scope of utility model registration request] A coil spring is compressed between the closing walls in a cylindrical valve box with an inflow/outflow opening provided at the upper and lower ends via a valve element, and a communication path is provided between the valve element and the coil spring. The provided valve element receiver is arranged,
A relief valve in which a valve is formed between a valve element and an inflow opening.