JPH0536481Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to the structure of a seal portion of an oil filter for an internal combustion engine. [Prior Art] Conventionally, this type of oil filter has an annular groove provided in a closure plate fixed to a reinforcement plate of the oil filter, as described in U.S. Pat. No. 3,567,023, for example. It has a structure in which a gasket is held in a groove, and the oil filter is tightened and fixed to the mounting part of the internal combustion engine, and the gasket is compressed and sealed by its elasticity. [Problem that the invention aims to solve] However, according to the conventional method, the compression ratio of the gasket is not maintained constant, so the gasket is compressed at an arbitrary compression ratio by tightening the oil filter. Therefore, compression set tends to increase due to excessive compression ratio, and when environmental conditions such as heat are added to this and the gasket itself deteriorates, its elasticity is lost. Therefore, in the conventional type, sealing failure occurs and loosening occurs due to vibration, leading to the fear of oil leakage. [Means for Solving the Problems] The present invention has a method in which a part of the closure plate and the case that is fixed by a seam protrudes in the axial direction of the case, and the part is used as a stopper part, and the part extends beyond the tip of the stopper part. A gasket having a height dimension and a deformable shape is held, and the compressibility of the gasket is made constant by the stopper part. [Function] According to the present invention, the gasket is compressed when the oil filter is tightened and fixed, but the gasket has a constant compression rate due to the stopper portion and is not excessively compressed, so that there is no increase in compression set. Further, even if the gasket deteriorates due to environmental conditions such as heat, elasticity is ensured within the above-mentioned constant compression ratio range. Furthermore, since the gasket is provided in a space with the inside of the stopper section consisting of the seaming fixing part on one side, the gasket and the seaming fixing part can be placed adjacent to each other, so the outer diameter of the gasket can be changed from the conventional one. Therefore, the outer diameter of the oil filter case can be reduced. [Effects of the invention] Therefore, the present invention can avoid poor sealing and loosening during vibration, and has great practical effects. Furthermore, it has become possible to reduce the outer diameter of the oil filter case without changing the diameter of the gasket or reducing the filtration performance of the oil filter. [Example] An example of the present invention shown in the drawings will be described below. Fig. 1 shows the main part of the present invention, in which an annular gasket 2 is held in a groove-shaped gasket holding part 3 whose one side is the inner side 1a of the tightening fixing part 1, and is deformable when compressed. A blank space 4, 4' is provided. Attachment part 1 of the internal combustion engine to the oil filter
Figure 2 shows the state in which it is attached to the mounting part 1.
4, the tip of the tightening fixing part 1 comes into contact with the stopper part, and the gasket 2 is compressed at a constant compression ratio. It goes without saying that the height B of the gasket 2 (FIG. 1) exceeds the height C of the stopper portion. Further, when compressed, the gasket 2 deforms into the spaces 4 and 4' shown in FIG. 1, thereby ensuring sealing performance. To explain an example of the structure of the oil filter of the present invention, as shown in FIG. 3, an over-element 9 is housed in a case 5 which is closed at one end. The open end of the case 5 is closed with a reinforcement plate 7, and a closure plate 6 provided on the plate 7 is secured to the periphery of the open end of the case 5 by wrapping. This fixing part 1 projects in the axial direction of the case 5 and forms a stopper part. A gasket holding portion 3 is provided by bending the closure plate 6. An oil outlet 7a that also serves as a mounting screw hole is provided at the center of the reinforcement plate, and a plurality of oil inlets 7b are provided around the oil outlet 7a. In the figure, 8 is a check valve, 10 is a protector, 11 is a support spring, 12 is an annular projection, and 13 is a release valve. The dimensions of each part of the above embodiment of the present invention are as follows:
In the figure, the stopper part dimension A is set to 4 mm, the height dimension B of the gasket 2 is set to 3.7 to 3.9 mm, and the compressed dimension C is set to 2.7 to 2.9 mm. Both the conventional retightening type oil filter (the above-mentioned US patent) and the oil filter of this invention can be tightened and fixed to the internal combustion engine with a tightening torque of 150 kg cm.
A circulation durability test was conducted at an oil temperature of 130°C and an oil flow rate of 20/min. Table 1 shows the results of investigating the retightening torque and sealing performance after this test. Table 1 shows that in the case of the conventional retightening type, the retightening torque decreased due to deterioration of the gasket, and the limit pressure resistance also decreased significantly compared to the initial value. In contrast, the present invention is extremely advantageous.

[Table] Conventionally, oil filters have been provided with a stopper part inside the seaming fixing part, but since the seaming fixing part is located outside of the stopper part, the oil filter case is considerably larger than the diameter of the gasket. Therefore, the outer diameter of the oil filter cannot be made smaller. However, with this invention, by using the seaming fixing part itself as a stopper part, it is possible to make the oil filter case smaller in the outer diameter direction without changing the gasket diameter, resulting in a smaller and lighter oil filter case. can be achieved to a large extent. FIG. 4 shows another embodiment of the present invention, in which the head of the gasket 2 has an asymmetrical shape in order to ensure the compression ratio and volume ratio. To give an example of the dimensions of each part of this embodiment, the stopper part dimension A is set to 4 mm, the gasket height dimension B is set to 4.2 to 4.4 mm, and the dimension C at the time of compression is set to 3.2 to 3.4 mm, so that a constant compression rate is achieved. is ensured.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of an embodiment of the present invention, Fig. 2 is a sectional view showing the structure of Fig. 1 attached to a mounting part, and Fig. 3 is a sectional view of an embodiment of the invention. FIG. 4 is a half sectional view showing the overall configuration, and FIG. 4 is a sectional view showing another embodiment of the present invention. 1... Sealing fixing part, 2... Gasket, 3...
...Gasket holding portion, 4...Vacancy, 5...Case, 6...Closure plate, 7...Reinforcement plate, 9...Excess element.

Claims (1)

[Claims for Utility Model Registration] (1) An over-element, a case with one end blind that accommodates the over-element, and a reinforcement plate having an oil inlet and an oil outlet with the open end of the case closed; An oil filter comprising: a closure plate provided on the plate and secured to the periphery of the open end of the case; A gasket is provided that protrudes in the axial direction and serves as a stopper part, has a height exceeding the tip of the stopper part, and has a shape that can be deformed within a space inside the stopper part, and the stopper part An oil filter characterized in that the compression ratio of the gasket is kept constant. (2) The oil filter according to claim 1, wherein the closure plate has a gasket holding portion that holds the gasket in a cavity inside the stopper portion. (3) The oil filter according to any one of claims 1 and 2, wherein the deformable portion of the gasket is asymmetrical.