JPH0118176Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in the seal structure of an oil filter.

Oil filters used in the lubrication system of internal combustion engines such as automobiles are built into the lubrication path that circulates under pump discharge pressure, and are used under severe conditions such as changes in oil viscosity due to temperature changes. A seal that can withstand high temperatures is required. The part where seal leakage is most likely to occur in an oil filter is the joint between the case and the end plate.

The structure of this part is a so-called seaming process in which the flange formed on the edge of the case opening and the flange formed on the periphery of the end plate are joined and both are bent double toward the cylindrical part of the case. It is twisted and crimped.

However, if this part is not evenly seamed, internal pressure will be added due to discharge pressure, filter element passage resistance, etc., and if oil is not sufficiently circulated during cold startup etc., internal pressure will increase. It may become abnormally high, causing minute leaks and loss of filter function.

Conventionally, as a means to prevent such seal leakage from the caulked portion, a highly viscous and elastic sealant was applied to the joint portion of the flange, and the seaming process was performed before the sealant hardened. In other words, conventional techniques have focused on the fact that the sealing agent is stretched by the seaming process of the joining portions, and that both joining portions are filled with the sealing agent in a uniform layer.

However, in reality, during the seaming process, gaps may occur between flanges, etc., resulting in partial cavities, and uneven tightening may cause oil leakage paths to form in a capillary shape, resulting in inconveniences where oil leaks. was.

Furthermore, since this capillary-like leak path is extremely minute, it is difficult to completely eliminate it during the product inspection process, and there is a risk of an oil leak accident after it is supplied to the market. Ta.

This invention was made to solve the above-mentioned disadvantages, and aims to maximize the sealing effect of the sealant and completely prevent oil leakage from the caulked portion.

In order to achieve the above object, the present invention is characterized in that a sealing agent is interposed only between the stepped portion of the stepped portion of the end plate and the inner peripheral surface of the case.

Hereinafter, one embodiment of this invention will be described in detail using the drawings.

Figure 1 shows an oil filter 1 to which this invention is applied.
It indicates 0.

In the figure, the oil filter 10 includes a cylindrical case 12 whose top is sealed and whose bottom is open, a cylindrical filter element 14 housed in the case 12, and a cylindrical filter element 14 arranged at the bottom of the case 12 and located at its center. The base plate 16 is connected to a lubricating oil path by screwing a threaded part provided inside the case 12, and an end plate 18 covers the bottom opening of the case 12.

A gasket 26 is disposed on the periphery of the lower surface of the end plate 18, and the joint surface with the object to which the oil filter 10 is attached can be airtightly sealed. The oil filter 10 is airtightly joined by seaming, and the inside of the oil filter 10 is airtightly sealed.

The filter element 14 is installed between cylindrical porous bodies 20 and 20', and a pair of end plates 22 and 22' are attached in the vertical direction, and the inner end of the lower end plate 22 is The case 12 is fixed to the base plate 16, and the upper end plate 22' is fixed to the case 12.
One end of a coil spring 24 latched to the upper part of the element 14 comes into contact with the upper part of the element 14 to bias the element 14 downward, thereby disposing the element 14 inside the case 12.

Further, a through hole 28 is bored in the base plate 16, and the oil supplied through the through hole 28 is purified by passing through the element 14 as shown by the arrow and returned to the lubrication system.

The structure of the joint between the end plate 18 and the case 12 is shown in FIG.

In the figure, the end plate 18 includes a bottom plate portion 18a having an outer shape approximately equal to the inner circumferential diameter of the opening of the case 12, and a step portion 18b formed on the periphery of the bottom plate portion 18a.
and a flange portion 18c continuous to the step portion 18b. This flange 18c is the case 12
Together with a flange 12a formed at the periphery of the opening, the case 12 is caulked and integrated with the periphery of the case 12 by seaming. Furthermore, a sealant 50 is interposed between the step portion 18b of the end plate 18 and the inner peripheral edge of the case 12. The sealing agent 50 is an elastic material that is highly resistant to oil, heat, and cold, and is applied to the periphery of the stepped portion 18b, the inner periphery of the opening of the case 12, or both at the time of seaming, and the two are fitted together in this state. As a result, it is formed in this part.

FIG. 3 shows the processing order. Figure a shows the state before processing, with the outer periphery of the flange 12a being bent for seaming. In this state, sealant 5
0 is applied and the two are fitted together, the sealant 50 is filled only into the gap between the inner circumferential surface of the case 12 and the stepped portion 18b, as shown in b, and the excess sealant 50 is poured into the flange 12a. , 18c (if applied to the stepped portion 18b side) or the joint periphery inside the case 12.

If the seaming process is performed in this state as shown in c and d, the seaming process will be done on the flanges 12a to 18c.
or between the outer peripheral edge of the case 12 and the flange 18c.
This is a metal-to-metal bond between the two. In other words, the sealant 50 is not interposed in this processed part at all, and the same level of sealing performance as the conventional caulking process that does not involve any sealant can be expected. It can bring about sex.

As explained above, this design achieves an independent sealing effect using the sealant and an independent sealing effect due to caulking between the metals, so there is no oil leakage that occurs when applying a sealant to the flange surface in the past. Therefore, the effect of using a sealant can be effectively exhibited.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view showing an oil filter to which this invention is applied, Figure 2 is an enlarged view of the main parts, Figure 3 a,
b, c, d are process explanatory diagrams. 10...Oil filter, 12...Case, 1
4...Element, 16...Base plate, 1
8... End plate, 18a... Bottom plate part, 18b... Step part, 18c... Flange, 20... Porous cylinder, 2
2...End plate, 24...Coil spring, 2
6...Gasket.

Claims (1)

[Scope of utility model registration request] A cylindrical case with an open bottom, a filter element housed in the case, and an end plate covering the bottom of the case, the opening edge of the case forming a flange bent outward, The end plate has a bottom plate that fits into the inner periphery of the opening of the case, and a flange that is joined to the flange through a step on the periphery of the bottom plate.By seaming both flanges, the bottom of the case is fixed. An oil filter having an end plate integrated with the bottom plate, wherein a sealing agent is interposed only between the step formed on the periphery of the bottom plate and the inner peripheral surface of the case. structure.