JPS61132711A - Stud used for oil filter etc. - Google Patents

Abstract

PURPOSE:To prevent a member such as an oil fitter from being loosened under hot condition by employing a stud in which a slit is prepared in a screw part engaging with said remember, while a hollow spacer possessing a heat expansion coefficient larger than that of the member screw engaging part, is incribed along the inner face thereof. CONSTITUTION:A plurality of slits 13 are provided in radial direction on the pipe wall of the portion of a stud protruding from an engine body 1, with regard to said stud 17 tightly screwed into the oil inlet port 3 of the engine body 1. a cylindrical spacer 12 is accurately inserted into the portion of the stud where those slits 13 are provided. This spacer 12 is made of a material whose thermal expansion coefficient is larger than those of the stud 17 and the plate member 16 of an oil filter main body 5. Accordingly, the screw diameter of the stud 17 is enlarged by the thermal expansion of the spacer 12 during the warming up run of an engine and even though a high vibratory acceleration takes place during a high speed run, the oil fitter main body 5 can be prevented from being loosened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stud for preventing loosening for assembling and equipping an automobile oil filter or oil cooler into a lubrication system of an internal combustion engine or other equipment.

[Conventional technology]

Taking a conventional stud for assembling an oil filter as an example, a simple tubular stud is used as the stud, as shown in FIG. 4. That is, the engine body l is provided with a supply port 2 for supplying oil to an oil filter, and an intake port 3 for introducing oil filtered by a filter 9 into the engine side, and the intake port 3 has a stud 4 having an oil passage. It is tightly screwed in. The oil filter tightening side threaded portion is provided with parallel threads, and has a structure that allows the oil filter to be removed and replaced repeatedly. The oil filter body 5 is tightened via the studs 4 to such an extent that the protrusion 11 of the plate 7 that is joined to the threaded plate member 6 comes into contact with the sealing surface lO of the engine body l. The amount of force corresponds to the amount of deformation of the elastic gasket 8 provided between the surfaces 10, and the frictional force of the sealing surface 10 caused by this force acts to prevent the stud 4 and the oil filter threaded portion from loosening.

[Problem that the invention seeks to solve]

In this case, if the protrusion 11 is tightened so as to strongly contact the sealing surface 10, the threaded plate member 6 and the plate 7 connected thereto will be deformed, and the gasket 8
Since the sealing function of the gasket 8 is lost, it is not possible to tighten with such strong force, and the gasket 8 is deformed and sealed, and the protrusion 11' can only be tightened with a tightening force such that it comes into contact with the sealing surface 10. It is normal not to have one.

Therefore, when a high photographing acceleration occurs such as in a high-speed operating range, in the conventional stat °4, the protrusion 11 is attached to the sealing surface 1.
There was a problem in that a tightening force close to 0 could not be withstood and would loosen.

This invention was made by focusing on such conventional problems, and has a structure in which the outer diameter of the stud expands due to thermal expansion relative to the inner diameter of the oil filter thread part as the engine warms up. The aim is to solve the above problems by creating a stat with °C.

[Means for solving problems]

The present invention provides a stud having a fluid path into which a member such as an oil filter can be screwed, and in which a slit is provided in a threaded portion into which the member is screwed, and a hollow slot (- This is a stud 3 for an oil filter, etc., in which a part of this part has a coefficient of thermal expansion larger than that of a threaded part of the oil filter.

〔Example〕

A non-inventive embodiment will be described using Figure fml~3.

The stud 17 is a tube body having a threaded portion 15 that is tightly screwed into the oil intake port 3 of the engine body 1 and a threaded portion 14 that is screwed into the oil filter tightening threaded portion. The following spacer 1 is attached to the tube wall, that is, the tube wall at the stud portion protruding from the device body 1 equipped with the stud 17.
A plurality of slits 13 are provided radially in the radial direction so that the outer diameter of the threaded portion 14 can be easily increased by the thermal expansion of the threaded portion 2 . Needless to say, the number of slits 13 to be provided is determined to be the necessary number to receive the expansion of the spacer as a displacement.

This stuff F'17 has a cylindrical slot made of a material with a higher thermal expansion coefficient than the stud 17 and the plate member 6 of the oil filter main body 5 to be assembled, and a part 12 has a slit 1.
They are assembled with precision inside the stiff part of the part where No. 3 is provided to form a double tube. Also, inside this stud, a part of the cage and the suction hole forming a hollow part 16 as a fluid path are provided.
2 is provided so that this hollow portion 16 and the flow path 18 for unfiltered oil do not communicate through the slit 13.

Next, the oil filter body 5 is attached to the threaded plate member 6 on the stud 17 screwed into the oil intake port 3 of the engine body 1.
(In the figure, the same reference numerals as in FIG. 4 represent the same members.) The assembly of the oil filter body 5 will be explained using the fourteenth part screwed onto the threaded part 14 of the stud 17 through the teeth,
When the engine is cold, that is, when the stud 17 is cold,
It is assembled with a standard tightening force such that the protrusion 11 of the plate 7 comes into contact with the sealing surface 10. Under these conditions, when the engine starts operating, the engine body 1 warms up, the lubricating oil temperature rises, and the stud 17, which also serves as a lubricating oil passage, warms up.
．． Both the spacer 12 and the threaded plate member 6 experience the same temperature rise. Here, since the spacer 12 made of the material with the largest coefficient of thermal expansion expands larger than the expansion of the screw diameter of the plate member 6, the stud 17 provided with the slit 13 can be easily expanded to expand the spacer 12 of the plate member 6. A force is applied to the threaded part to try to expand it. Therefore, when one engine is warm, force is constantly applied to it, so it remains tightly screwed together. Note that when the engine is stopped and cooled down, the force decreases and the attachment and detachment becomes easier.

In addition, when the stud 17 is assembled to the engine body 1, torque can be applied by engaging the slit 13.
Stud CeraTough can be used for screwing work by tightening the conventional threaded part.The work can be done with a simple tool as an alternative to the conventional tool.

Further, the entire main body of the stud 317, or at least only the threaded portion with the plate member 6, is made of a material with a higher coefficient of thermal expansion than the material of the threaded plate member 6, and the slits 13 and spacers 12 are formed as necessary. Even if it is provided, similar actions and effects can be obtained. In other words, even if the stud is tightened with the standard tightening force when the engine is cold, the area around the stud warms up uniformly as the engine runs, and the stud diameter is made of a material with a large expansion coefficient and is larger than the thread diameter of the threaded plate member 6. As it tries to expand, the two become tightly screwed together.

The shape of the slit 13 and the spacer 12 is such that the spacer 12 expands the slit 13 and threads the threaded portion 1 of the stud 17.
4 It is not specified as long as it is possible to increase the outer diameter. 1 For example, the slit 13 may not have an opening at the end edge of the stud 17 or may not be along the stud axis direction. . Further, the spacer 12 may be of any shape other than a cylinder, such as a ring, a rod having a hollow portion 16 with a large number of holes, or a cylinder having a lip on its inner wall.

As shown in FIG. 1, an annular protrusion 19 may be provided on the plate member 6 so that the tip of the protrusion can come into contact with the engine body 1, or an annular body may be interposed, or the spacer 12 may be provided with an annular protrusion 19 to avoid threaded grooves. By providing a protrusion that fits into the slit 13 in the area, communication between the flow path 18 and the inside of the oil filter through the slit 13 can be completely prevented.

As explained above, according to the present invention, a slit is provided in the tightening screw part of the oil filter, etc., and the inside of the slit has a higher coefficient of thermal expansion than the material of the threaded plate member of the oil filter, etc. By using the stuff P with a spacer made of a material inside, when the engine is warmed up during operation, the thread diameter of the stuff R expands due to the thermal expansion of the spacer, and it is tightly screwed into the threaded part of the threaded plate member. The effect is that loosening can be prevented even if high vibration acceleration occurs during high-speed operation.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the state of use of the stud according to the present invention, Fig. 2 is a side view, Fig. 3 is a view taken along the line I-I in Fig. 2, and Fig. 4 is an explanatory diagram of the state of use of the stud according to the conventional example. It is a diagram. 1... Engine body, 2... Supply port, 3.
...Intake port. 4...Stud, 5...Oil filter body, 6...Plate member, 7...
Plate, 8...Gasket, 9...
Filter, 10... Seal surface, 11...
・Protrusion, 12...Spacer, 13...
・Slit, 14.15... Threaded part, 16...
...Hollow part, 17...Stud. 18...
...Flow path, 19...Protrusion. Patent applicant: Nissan Koki Co., Ltd. Representative patent attorney: Tadashi Takagi Yukima
1) Takashi Part 3 Figure 2 Figure 4

Claims (1)

[Scope of Claims] 1. In a stud having a fluid path into which a member such as an oil filter can be screwed, a slit is provided in the threaded portion into which the member is screwed, and a part or all of the slit portion is hollow. A stud for an oil filter, etc., comprising a spacer internally disposed therein, and a coefficient of thermal expansion of the spacer being larger than a coefficient of thermal expansion of a threaded portion of the oil filter. 2. The stud is made of a tubular body and has a threaded portion formed on its outer circumferential surface, and a tubular spacer is fitted to its inner circumferential surface to form a double tube. Stats listed. 3. The spacer is made of a material with a coefficient of thermal expansion larger than that of the threaded portion of the oil filter, and is fitted with a thickness adjusted to match the inner peripheral surface of the stud. 3. The stud according to claim 1 or 2, which is a tubular body. 4. The stud according to any one of claims 1 to 3, wherein the spacer is fitted inside only a part of the stud that protrudes from the main body of the device equipped with the stud. . 5. The stud has threaded portions that are screwed into the equipment and the oil filter, respectively, and a plurality of the slits are provided radially in the threaded portion for mounting the oil filter. The stud according to any one of items 1 to 4.