JPS6371510A - Method for setting drain plug of oil pan and drain part construction - Google Patents

Abstract

PURPOSE:To improve sealing performance by fixing a coaxial drain seat to the drain hole of an oil pan made of vibration damping steel where a resin thin layer is interposed between two sheets of steel plates and interposing a gasket and an oil-proof sealant in the screw axis part of a drain plug. CONSTITUTION:An oil pan 10 is made of vibration damping steel plates where a viscous resin 10c is interposed between two upper and lower thin plates 10a and 10b, and a drain hole is formed at its bottom part. To the drain hole, a drain seat 16 provided with a screw hole 14 is fixed almost coaxially. And the head part 24 of the drain plug 20 in which a gasket 26 which is to be crushed at the time of engaging is inserted in advance, and after an oil-proof sealant 32 is applied to the opposite to the plug head part 24 of this gasket 26, the drain plug 20 is engaged with the drain seat 16.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for attaching a drain plug to an engine oil pan formed of a damping steel plate with a thin resin layer interposed between two steel plates, and a drain part thereof. It's about structure.

(Prior Art) Recently, in order to reduce the vibration and noise of ennons, it has been proposed to manufacture oil and yarn, which is one of the sources of noise, from vibration-damping steel plates. As is well known, a vibration damping steel plate is made by interposing a thin layer of viscous resin between two thin steel plates, and has the effect of suppressing vibrations of a thin plate structure such as an oil pan. In order to occasionally change the oil (-5) and remove deposits such as metal wear particles that have accumulated at the bottom of the oil pan, a drain hole is drilled on the bottom or side wall near the bottom. , a drain sheet with a screw hole is fixed, and a drain plug is screwed to the drain sheet through a gasket.1. An example of the structure of the drain part of a conventional oil pan is shown in Figures 5 to 7. To explain the drawings, first, in FIG.
A bottom plate or a side wall near the bottom plate of an oil pan made of a damping steel plate with a thin layer 10c of viscous resin interposed therebetween;
2 is a drain hole bored in the bottom plate or side wall. A drain sheet 6 equipped with a screw hole 14 is fixed to the inside of the oil pan approximately concentrically with the drain hole 12. In the case shown in the figure, the drain sheet 16 has a planar shape of an equilateral triangle with the vicinity of the apex cut off. No, three projection parts arranged substantially on the same circumference are fixed to the bottom plate or side wall 10 by projection welding (indicated by reference numeral 18).

On the other hand, the drain plug 20 is in the form of a bolt and includes a screw shaft portion 22 and a head portion 24 that are screwed into the screw hole 14 . In the illustrated case, a hollow annular gasket 26 formed by bending a thin metal plate to form a closed cross section is fitted onto the screw shaft 22 of the drain plug 20, and the screw shaft 22 is screwed into the screw hole 14 of the drain silt 16 and tightened. By doing so, the gasket 26 is crushed and the oil in the oil pan is prevented from flowing out. However, in this structure, the bottom surface of the oil pan or the inner surface of the side wall 10 and the drain sheet 16
(There is a minute gap between the facing surfaces of the projection weld 18 and the screw hole 14 because they are only integrally fixed at three projection welds 18) and the screw hole 14.
Oil permeates through the fine gap between the thread groove and the thread at the threaded joint between the drain hole 12 and the threaded shaft 22, and the oil penetrates between the inner peripheral surface of the drain hole 12 and the outer peripheral surface of the threaded shaft 22 of the drain plug. It is inevitable that the particles will accumulate in the annular space 28 between them.

As is well known in the art, when a cross section of a damping steel plate, in this case the inner circumferential surface of the drain hole 12, is directly exposed to oil, a thin resin layer 10c and a steel plate 10a are formed.

Oil enters the interface with 10b, causing deterioration of damping performance over time. Therefore, it is necessary to cover the inner peripheral surface of the drain hole 12 with an oil-resistant sealant to prevent direct exposure to oil. For this reason, conventionally, as shown in FIG. 6, an operator operates a sealant gun or a nozzle 30 to apply sealant 32 to the inner peripheral surface of the drain hole 12. The sealant 32 is applied so that it hangs down due to its viscosity, and when the drain plug 20 is screwed on as shown in FIG. Much of the material that was originally carried away and remained in the annular space 28 also adheres around the screw shaft 22 and is guided in the direction of screwing, so that the sealant 32 is deposited on the inner periphery of the drain hole 2. There was a problem in that the thin resin layer could not effectively cover the surface of the annular space 28, and as a result, the vibration damping performance deteriorated over time. Although the drawings are shown enlarged for explanation, in the case of an actual small engine such as an automobile engine, the outer diameter of the threaded shaft portion 22 of the drain plug is
Most of them are around 101+++1 to 15Wn, and sealant 3 is applied to the inner peripheral surface of the drain hole 12 using a sealer gun 30.
It is not easy to apply 2, and it is also large and heavy.
The problem is that the entire oil pan must be handled, resulting in significant worker fatigue.Also, even if an automatic applicator is created without manual labor, it requires the use of jigs, transport devices, etc. to fix the large-volume oil pan. Related equipment will be seriously damaged.
There was a problem that made it expensive. Note that although the illustrated device is exemplified by a hollow gasket 26 that is crushed by the tightening force, the situation is almost the same in the case of a solid gasket that has been widely used in the past, and the annular space 28
It is extremely difficult to effectively fill the sealant 32 inside the drain hole 12 and reliably protect the inner peripheral surface of the drain hole 12 from being exposed to oil.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned low workability and difficulty in automation of the conventional drain plug mounting method, and improves the vibration damping performance of the resulting drain structure. It is an object of the present invention to provide a method for attaching a drain plug of an oil pan made of vibration-damping steel plate and a structure of a drain part, which can eliminate the above defects.

(Means for Solving the Problems) The present invention was devised to achieve the above object, and is formed by a damping steel plate with a thin resin layer interposed between two steel plates. Oil with a drain hole nearby/? A drain sheet having a threaded hole substantially concentric with the drain hole is fixed inside the drain plug, and a gasket that is crushed by applying a tightening force is fitted to the threaded shaft of the drain plug, A drain plug for an oil pan characterized in that an oil-resistant sealant is applied in an annular shape to the surface of the gasket opposite to the plug head, and then the plug is screwed into the screw hole of the drain sheath 1 and tightened. A first invention which summarizes a mounting method, and an oil pan formed of a damping steel plate with a thin resin layer interposed between two steel plates and having a drain hole bored at or near the bottom of the oil pan; a drain sheet fixed to the inside of the drain plug and having a threaded hole substantially concentric with the drain hole; a drain plug having a threaded shaft portion screwed into the threaded hole; It consists of a gasket that is fitted and crushed when the plug is screwed onto the drain seat and tightened, and an oil-resistant sealant that is applied to the surface of the gasket opposite to the plug head. The oil pan is characterized in that when the gasket is crushed, the sealant is press-fitted into the annular space between the inner peripheral surface of the drain hole and the drain plug shaft. This invention proposes a second invention which is centered on a drain part structure.

(Function) According to the first invention, a collapsible gasket is interposed in the threaded shaft of the drain plug, and an oil-resistant sealant is applied in an annular manner to the surface of the gasket opposite to the plug head. Afterwards, the drain plug is tightened to the drain seat and the gasket is crushed. (1) Even when applying sealant by hand, there is no need to handle a large and heavy oil pan, and the sealant is applied to the drain plug side. It has good workability and can reduce worker fatigue, and even when making an automatic coating device, the device can be made extremely small and simple, and (11) the gasket is crushed when the drain plug is tightened. As a result, the sealant applied to the gasket is forced into the annular space between the threaded shaft of the drain plug and the drain hole, effectively covering the inner peripheral surface of the drain hole. It is possible to ensure the distribution performance of the produced oil pan.

Further, according to the second invention, a special gasket roller that is crushed by tightening the drain plug is used, and the gasket is applied to the surface opposite to the plug head of the gasket fitted to the threaded shaft portion of the drain plug. The annular sealant is pushed out by the crushing of the gasket when the plug is tightened, and is press-fitted into the annular space between the inner circumferential surface of the drain hole and the screw shaft, so that the inner circumferential surface of the drain hole is covered with sealant. This effectively covers the oil pan and ensures the vibration distribution performance of the damping steel plate that constitutes the oil pan.

(Example) Examples of the present invention will be specifically described below with reference to FIGS. 1 to 4. (Parts that are substantially the same as or correspond to the members and parts already explained with reference to FIGS. 5 to 7 are given the same reference numerals and repeated explanations are omitted.) First, let's start with FIGS. In the first embodiment shown in FIG. 2, according to the method of the present invention, the threaded shaft portion 22 of the drain plug 20 is provided with a plug head 24 of a hollow gas kent 26 made of a thin metal plate so as to form a closed cross section. A sealant 32 is applied in an annular manner onto the opposite surface using a sealer gun 30.

The application operation using the sealer gun 30 can be performed manually or by simple automatic equipment. (for example,
The head 24 of the drain plug 20 with a gasket attached in advance is fitted into the socket on the slowly rotating support base, and the sealer gun 30 is fixed at a predetermined angle to the side of the support base. As the sealant rotates, the sealant may be pressurized by compressed air or the like and discharged in a fixed amount. On the other hand, the head of the drain plug 20 with a gasket attached thereto may be fitted into a socket of a fixed support base, and the sealer gun 30 may be rotated around the head of the drain plug 20. ) Next, as shown in FIG. 2, when the drain plug 20 is screwed onto the drain seat 16 and tightened, the gasket 26 is crushed,
The sealant 32 applied thereon is formed between the inner circumferential surface of the drain hole 12 and the outer circumferential surface of the screw shaft portion 22 by deformation of the gasket, and is press-fitted into the annular space, and the sealant 32 is press-fitted into the drain hole as shown in the figure. The inner peripheral surface of 12 is coated in an oil-tight manner. As a result, oil enters into the annular space through the minute gap between the drain sheet 16 and the bottom surface of the oil nozzle or the inner surface of the side wall 10 and the minute gap between the threaded portion of the drain sheet 16 and the drain plug 20. Even if a small amount of coolant enters due to a slight shortage of the amount of coolant applied, it will not come into contact with the inner peripheral surface of the drain hole 12 (particularly the interface between the main steel plate and the thin resin layer). Therefore, deterioration of the vibration damping performance of the oil pan made of vibration damping steel plates is effectively prevented.

Next, in the second embodiment of the present invention shown in FIGS. 3 and 4, the gasket 2G made of a thin metal plate does not have a closed cross section, but has a substantially fishhook cross section, and the head of the drain plug Part 24
An annular opening is provided on the opposite side. After the gasket 26 is first fitted onto the screw shaft portion 22, the sealant 32 is applied by a sealer gun 30 to the inside of the gasket 26 and, if necessary, to the extent that it protrudes from the annular opening. Next, when the drain plug 20 is tightened to the drain seat 16 as shown in FIG. As in the first embodiment, the inner peripheral surface of the drain hole 12 is effectively coated with the sealant, so that the vibration damping performance of the oil pan made of vibration damping steel plate changes over time. Deterioration is effectively prevented.

(Effects of the Invention) As described above, the oil pan drain plug installation method according to the present invention is formed by a damping steel plate with a thin resin layer interposed between two steel plates, and a damping steel plate is formed on the bottom surface or near the bottom of the damping steel plate. A drain sheet having a threaded hole substantially concentric with the drain hole is fixed inside an oil pan having a drain hole, and the threaded shaft of the drain plug is crushed by applying a tightening force. The gasket is fitted with a gasket, an oil-resistant sealant is applied in a circular pattern to the opposite side of the gasket from the plug head, and then the plug is screwed into the screw hole of the drain sheet and tightened. If the sealant application work is done manually, the work efficiency is improved and the worker's fatigue is reduced, and even if the sealant application work is done automatically, the This has the advantage of making the device simple and inexpensive. Furthermore, the drain part structure of the oil pan according to the present invention is an oil pan (J3) formed of a damping steel plate with a thin resin layer interposed between two steel plates, and having a drain hole bored at or near the bottom of the damping steel plate. , a drain sheet fixed to the inside of the oil pan and having a threaded hole substantially concentric with the drain hole, a drain plug having a threaded shaft part screwed into the threaded hole, and a threaded shaft of the drain plug. The drain plug consists of a gasket that is fitted into the drain seat and crushed by screwing and tightening the plug to the drain seat, and an oil-resistant sealant applied to the surface of the gasket opposite to the plug head. is characterized in that when the gasket is tightened, the sealant is press-fitted into the annular space between the inner peripheral surface of the drain hole and the drain plug shaft, Since the inner circumferential surface of the drain hole can be reliably coated with the sealant, there is an advantage that deterioration over time of the vibration damping performance of the oil pan made of a damping steel plate can be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 shows a drain plug 20 in a first embodiment of the present invention.
FIG. 2 is a side cross-sectional view showing a state in which a sealant 32 is applied after fitting a gasket 26 to the drain plug 16, and FIG. 2 shows a state in which a drain plug 20 prepared as shown in FIG. 1 is screwed onto a drain sheet 16 and tightened. 3 is a side sectional view similar to FIG. 1 in a second embodiment of the present invention, and FIG. 4 is a drain plug prepared as shown in FIG.
5 is an exploded sectional view of the drain part in a conventional oil pan, and FIG. 6 is a sectional view showing how the drain hole 12 is screwed and tightened.
FIG. 7 is a side sectional view showing the state of the sealant 32 applied by the method of FIG. 6 after the drain plug is screwed together. ]0...Oil pan bottom plate or side wall, 12...Drain hole, 16...Drain seat, 20...Drain plug,
22...Screw shaft portion, 24...Head, 26...Gasket, 32...Sealant. Figure 3 z4 Figure 4 Figure 5 Figure 6 Off view. −Koichi

Claims (2)

[Claims] (1) Inside the oil pan, which is formed from a vibration-damping steel plate with a thin resin layer interposed between two steel plates and has a drain hole drilled on or near the bottom of the oil pan, there is a A drain sheet with a screw hole is fixed, and a gasket that is crushed by applying tightening force is fitted to the threaded shaft of the drain plug, and an oil-resistant gasket is attached to the side opposite to the plug head of the gasket. A method for attaching a drain plug to an oil pan, the method comprising: applying a circular sealant, and then screwing the plug into the screw hole of the drain seat and tightening the plug. (2) An oil pan formed from a vibration-damping steel plate with a thin resin layer interposed between two steel plates, with a drain hole bored at or near the bottom of the oil pan, which is fixed inside the oil pan and has the drain hole. a drain seat having a screw hole substantially concentric with the drain seat, a drain plug having a screw shaft portion screwed into the screw hole, and a drain plug fitted into the screw shaft portion of the drain plug and screwing the plug into the drain sheet. It consists of a gasket that is crushed when the drain plug is tightened, and an oil-resistant sealant that is applied to the surface of the gasket opposite to the plug head. An oil pan drain structure, characterized in that a sealant is press-fitted into an annular space between the inner peripheral surface of the drain hole and the drain plug shaft.