JPH07293220A - Engine oil injection port structure - Google Patents

Abstract

PURPOSE:To eliminate the possibility of oil splashing from an oil injection port to the outside and to easily and smoothly inject oil. CONSTITUTION:An oil protector 6 is provided on the bottom part of an oil injection port 3 provided on the upper surface of a cylinder head cover 1 so as to cover this oil injection port 3 and two restraining pieces 8a and 8b having a step S between them on a protector part 8 drooping along one side inner wall surface 1a of the cylinder head 1 are arranged in a direction for blocking an oil splashing and flowing out direction. An opening 11 surrounded by one side inner wall surface 1a and the protector part 8 between the restraining pieces 8a and 8b is formed in a direction roughly perpendicular to the oil injection port 3 and an oil downstream direction is formed by being bent more than twice in a maze on the front and back of the opening 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an oil inlet provided in a cylinder head cover of an engine.

[0002]

2. Description of the Related Art A cylinder head cover of an engine provided with an oil inlet is disclosed, for example, in Japanese Utility Model Laid-Open No. 64-464.
It is known from Japanese Patent No. 53, etc. It is also known that measures are taken to prevent the oil from splashing outside from the oil inlet even when the engine is operated without forgetting to attach the cap.

For example, as shown in FIG. 3, a cylinder-shaped oil inlet 23 is formed on the upper surface of the cylinder head cover 21 and extends downward at the lower end of the oil inlet 23 toward the lower portion of the rear oil inlet 23. The oil protector 24 is provided so that even if the oil splashed up by the rotating member 22 such as a chain or an intermediate cam disposed at one end of the cam shaft is scattered toward the oil inlet 23, the oil protector 24 It is known that it was prevented from being scattered by the outside.

Further, as shown in FIG. 4, instead of forming the oil protector 24 integral with the cylinder head cover 21, a shielding wall 25 is hung from the lower end of the oil injection port 23, and the lower part of the oil injection port 23 is provided at the lower end thereof. It is also known to have a shield plate 26 extending toward.

[0005]

However, in such a prior art example, in order to prevent the oil protector 24 and the shield plate 26 from interfering with the oil protector 24 and the shield plate 26 at the time of oil injection, the oil injecting work is not illustrated. As shown in Figure 3,
As shown by the arrow in FIG. 4, there is a problem in that it is not possible to completely prevent the oil scattered by the rotary member 22 from passing through the oil inlet 23 to the outside.

That is, the oil protector 24 and the shield plate 26 and the cover portion of the oil inlet 23 are enlarged, and the oil protector 24 and the shield plate 2 are covered.
If 6 is arranged close to the lower edge of the oil inlet 23,
Although it is possible to prevent the oil splashed by the rotating member 22 from directly splashing from the oil injection port 23 to the outside, there is a problem in that it hinders the oil injection and the oil injection cannot be smoothly performed.

In view of the above conventional problems, the present invention is free from the risk of oil splashing from the oil injection port to the outside, can easily and smoothly inject the oil, and is inexpensive at the oil injection port of the engine. It is intended to provide a structure.

[0008]

According to the present invention, at least two stopper pieces are formed on an oil protector provided below an oil inlet provided on an upper surface of a cylinder head cover so as to cover the oil inlet from below. A step is provided to these stop pieces, and the stop pieces are arranged so as to block the scattering and outflow direction of the oil.

[0009]

According to the present invention, at least two stop pieces having large steps are formed in the oil protector arranged so as to cover the oil inlet from below, and an opening is formed between these stop pieces. Therefore, when oil is injected from the oil injection port, the oil flows down on the stop piece of the oil protector and smoothly flows into the cylinder head through the opening with a sufficiently large area, so the oil injection work is easy. Yes, and all the oil splashed up by the rotating member and splashed toward the oil inlet collides with the oil protector and falls, and the stop piece is provided in the direction that blocks the splashing and outflowing direction of the oil. , The direction of the oil flow is bent in a labyrinth shape twice or more before and after the opening, so that the oil splash is further suppressed and the above-mentioned scattered oil is From scattering from the inlet to the outside can be completely prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a cylinder head cover of an engine, inside which a rotating member 2 such as a chain arranged at one end of a cam shaft or a cam in an intermediate portion is arranged. A cylindrical oil injection port 3 is integrally formed in a portion near one side of the upper surface of the cylinder head cover 1. A female screw 4 into which a cap is screwed is formed on the inner peripheral surface of the oil inlet 3. Also, the oil inlet 3
The upper end portion of the is slightly projected from the upper surface of the cylinder head cover 1 so that dust and water do not flow in.

A shield wall 5 is provided at a portion of the lower end of the oil injection port 3 far from the inner wall surface 1a on one side of the cylinder head cover 1.
Is hung down, and the oil protector 6 is attached to the lower end surface thereof. A partition wall 1b is provided on the one side inner wall surface 1a integrally with the cylinder head cover 1 so as to be adjacent to both sides of the oil protector 6. As shown in detail in FIG. 2, the oil protector 6 includes a mounting portion 7 for the shielding wall 5 and a protector portion 8 that hangs substantially along the inner wall surface 1 a on one side. Mounting holes are provided at both ends of the mounting portion 7. 9 is provided and is attached to the shielding wall 5 by caulking 10.
Then, the protector portion 8 is partially cut in a direction from the lower end toward the mounting portion 7 at a position of about half the lateral width, and one half is bent at the innermost portion of the cut to form the first stop piece 8a. However, the other half is bent further downward to form a second stop piece 8b.

These two restraining pieces 8a, 8b form a protector portion 8 having a step S arranged in the lateral width direction, and an opening portion surrounded by the one side inner wall surface 1a and the protector portion 8 in the cut cross section. 11 is formed in a direction substantially perpendicular to the oil injection port 3 so that the injected oil can smoothly flow out toward the cylinder head through the opening 11.

In the above structure, even if a part of the oil splashed by the rotating member 2 is scattered toward the inside of the oil inlet 3 as shown by the arrow in FIG. Since it is set so as to cover 3, the oil can be completely prevented from colliding with the oil protector 6 and scattering from the oil injection port 3 to the outside. In addition, the protector portion 8 is formed with stop pieces 8a and 8b having a step S at the lower portion thereof, and further, an opening 11 having an area large enough for oil to flow out is formed in a direction substantially perpendicular to the oil inlet 3. Therefore, when the oil is injected from the oil injection port 3, the oil flows down on the stop pieces 8a and 8b of the oil protector 6 and smoothly flows into the cylinder head through the opening 11. Easy to work.

In the above embodiment, the oil protector 6 is formed by pressing one plate material as shown in FIG. 2, but the protector portion 8 is attached to the mounting flange corresponding to the mounting portion 7. It may be constructed by welding, and the shape of the protector portion 8 may be appropriately designed according to the structure of the cylinder head cover 1. Further, although the oil protector 6 as shown in FIG. 2 is left open on both sides thereof, partition side walls are integrally formed on both sides of the protector portion 8 to form a passage through which the oil flows down which is closed by the oil protector 6. You may do it. In this case, the partition wall 1b formed integrally with the cylinder head cover 1 of this embodiment need not be provided.

[0015]

According to the oil inlet structure for an engine of the present invention, at least two stop pieces having large steps are formed on the oil protector arranged so as to cover the oil inlet, and Since an opening is formed between them, when oil is injected from the oil injection port, the oil flows down on the stop piece of the oil protector and flows smoothly into the cylinder head through the opening having a sufficiently large area. , The oil injection work is easy, and all the oil splashed up by the rotating member and scattered toward the oil injection port collides with the oil protector and falls, and the stopper blocks the oil scattering and outflow direction. Since it is installed in the direction, the direction of oil flow is bent like a labyrinth more than once before and after the opening, so the above-mentioned scattered oil is From scattering from the inlet to the outside can be completely prevented. Further, only by changing the setting of the shape of the oil protector, it is possible to obtain the effect of being able to completely prevent the scattering of oil without significantly increasing the cost.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an example of an oil inlet of an engine of the present invention.

FIG. 2 is a perspective view of an oil protector of the same embodiment.

FIG. 3 is a vertical sectional view of an oil inlet structure of a first conventional example.

FIG. 4 is a vertical sectional view of an oil inlet structure of a second conventional example.

[Explanation of symbols]

 1 Cylinder Head Cover 3 Oil Filling Port 6 Oil Protector 8a Stopper 8b Stopper S Step

Claims (1)

[Claims] 1. An oil protector provided below an oil inlet provided on the upper surface of a cylinder head cover so as to cover the oil inlet from below, and at least two stoppers are formed on the oil protector. The oil inlet structure of the engine is characterized in that it is arranged in a direction that blocks the direction of oil scattering and outflow.