JPH10238328A - Oil filler structure of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil filler structure for an internal combustion engine capable of smoothly injecting oil through an oil filler port without increasing cost. SOLUTION: An internal combustion engine is formed such that sprockets 6 and 7 and tied to the end parts of intake and exhaust cam shafts 4 and 5, respectively, arranged in parallel to each other on a cylinder head 1 and a chain guide 9 is provided to make contact with a chain 8 wound around and between the two sprockets 6 and 7 and guide the chain, and an oil filler port 10 is opened to a head cover 2. The oil filler port 10 is opened in a position situated above the chain guide 9 between the intake and exhaust cam shafts 4 and 5 of a head cover 9 and at least partially overlapped, as seen from a plane, with the chain guide 9. Since flying of oil is prevented by the chain guide 9, there is no need to partially cover the oil filler port 10 with a shield plate like a conventional type, the cost is reduced, and oil is smoothly and rapidly injected through the oil filler port 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil filler structure for supplying oil from an oil filler opening opening in a head cover of an internal combustion engine.

[0002]

2. Description of the Related Art In an internal combustion engine in which parts are lubricated with oil, oil is supplied by an oil filler structure as shown in FIGS.

FIG. 4 is a plan view of the end of an internal combustion engine having a conventional oil filler structure with a head cover removed, and FIG. 5 is a longitudinal sectional view of the end of the internal combustion engine.
In the drawing, 101 is a cylinder head, 102 is a head cover attached to the upper surface of the cylinder head 101, and an intake cam shaft 104 and an exhaust cam shaft 105 are arranged on the cylinder head 101 in parallel with each other.

The above intake camshaft 104 and exhaust camshaft 105
Sprockets 106 and 107 are connected to the respective ends of the sprocket, and a chain 108 is wound between the sprockets 106 and 107. And the chain 10
8, a predetermined tension is applied to the chain guide 109, and the chain guide 109 is attached between the intake and exhaust cam shafts 104, 105 of the cylinder head 101 by two bolts 112. .

By the way, as shown in FIG. 4, a head cover 102 conventionally has an oil filler port 110 which opens toward one side (in the illustrated example, the intake side) above one sprocket 106. A filler cap 111 is screwed into the head cover 110, and as shown in FIG.
Is integrally formed with a shielding plate 102a that partially covers the lower portion of the cover. Note that the shielding plate 102a is
This is to prevent the oil in the engine from scattering even if the operator forgets to tighten the cover, and a separate shield plate may be attached to the head cover in some cases.

[0006]

However, in the conventional oil filler structure shown in FIGS. 4 and 5, the oil filler port 110 is partially covered by the shielding plate 102a. When injecting oil from 110, there was a problem that the oil was squeezed by the shielding plate 102a and was not injected smoothly.

[0007] Further, in the case of employing a configuration in which a separate shielding plate is attached to the head cover, the cost is inevitably increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an oil filler structure of an internal combustion engine that can smoothly inject oil from an oil filler port without increasing costs. To provide.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a sprocket is connected to each end of an intake / exhaust cam shaft arranged in parallel with each other on a cylinder head. An internal combustion engine having a chain guide that abuts and guides a chain wound between the two sprockets and has an oil filler port opened in a head cover. An opening is provided at a position above and between the chain guides and at least a part thereof overlaps the chain guide in plan view.

According to a second aspect of the present invention, in the first aspect of the present invention, the end of the head cover on the side where the oil filler port opens is formed along the sprocket.
It is characterized in that it has two chevron shapes and the oil filler port is opened in a valley between two chevron portions.

Therefore, according to the first aspect of the present invention, since the oil can be prevented from being scattered by the chain guide, it is not necessary to partially cover the oil filler port with the shielding plate as in the prior art, and the cost can be reduced. As well as
Oil can be smoothly and quickly injected from the oil filler port.

According to the second aspect of the invention, the end of the head cover on the side where the oil filler port is opened has two chevron shapes along the sprocket, and the oil filler is formed in the valley between the two chevron portions. Since the mouth is opened, the rigidity of the head cover is increased, engine noise can be suppressed, and the height of the filler cap can be suppressed.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view of an end portion of an internal combustion engine having an oil filler structure according to the present invention with a head cover removed, FIG. 2 is a longitudinal sectional view showing the oil filler structure of the end portion of the internal combustion engine, and FIG. FIG. 3 is a view in the direction of arrow A in FIG. 2.

The internal combustion engine according to the present embodiment is a four-cycle multi-cylinder engine, and a head cover 2 has a plurality of head bolts 3 (FIG.
As shown in FIG. 1, an intake camshaft 4 and an exhaust camshaft 5 are arranged in the cylinder head 1 in parallel with each other.

A storage space S is formed at one end of the engine by the cylinder head 1 and the head cover 2. The storage space S is formed between the intake cam shaft 4 and the exhaust cam shaft 5 rotatably supported on the cylinder head 1. Sprockets 6 and 7 are respectively connected to the ends facing the storage space S. An endless chain 8 is provided between the sprockets 6 and 7.
The chain guide 9 is in contact with the chain 8 and a predetermined tension is applied to the chain guide 9.

As shown in FIG. 3, the end of the head cover 2 is formed into two chevron shapes along the sprockets 6 and 7, and the height of the trough between the two chevron portions 2a is increased. A low columnar boss 2b is integrally formed, and a circular oil filler port 10 is formed in the boss 2b. Accordingly, the oil filler port 10 is opened upward between the sprockets 6 and 7, and the filler cap 11 is screwed to the opening.

On the other hand, the chain guide 9 is connected to the intake / exhaust cam shafts 4 of the cylinder head 1 by two bolts 12.
5 and its upper end 9a is located between the two sprockets 6 and 7 and extends horizontally above the two sprockets 6 and 7, and its end (free end) Extends outward from the end faces of the sprockets 6 and 7 (to the right in FIGS. 1 and 2). Accordingly, as shown in FIG. 1, the chain guide 9 and the oil filler port 10 overlap each other in plan view.

The upper end 9 of the chain guide 9
A resin-made sliding member 13 having high abrasion resistance is attached to the lower surface of a, and a predetermined tension is applied to the chain 8 when the sliding member 13 contacts the chain 8.

As described above, in the internal combustion engine according to the present embodiment, the upper end 9a of the chain guide 9 extends outward beyond the end faces of the sprockets 6, 7, and the chain guide 9 and the oil filler port 10 are separated from each other. Since the chain guide 9 covers the lower part of the oil filler port 10 because they overlap with each other in a plan view, the oil in the engine scatters out of the oil filler port 10 even if the filler cap 11 is forgotten to be tightened. Never do.

Therefore, the oil filler port 1 is different from the conventional one.
0 does not need to be partially covered with a shielding plate.
It is not necessary to integrally form a shielding plate on the head cover 2 or to attach a separate shielding plate to the head cover 2, so that cost can be reduced and oil can be smoothly and quickly injected into the engine from the oil filler port 10. .

In the internal combustion engine according to the present embodiment, the oil filler port 1 of the head cover 2 is provided as described above.
The end on the side where 0 is opened has two chevron shapes along both sprockets 6 and 7, and a low-height boss 2b is formed in a valley between the two chevrons 2a to form a boss 2b. Since the oil filler port 10 is opened, the rigidity of the head cover 2 is increased in shape, engine noise can be suppressed low, and the height of the filler cap 11 can be suppressed low.

[0023]

As is apparent from the above description, claim 1
According to the described invention, the sprockets are respectively connected to the ends of the intake and exhaust camshafts arranged in parallel on the cylinder head, and the sprockets are brought into contact with the chain wound between the sprockets to guide the sprockets. An internal combustion engine having an oil filler port opened in a head cover, the oil filler port being located above the chain guide between the intake and exhaust cam shafts of the head cover, and at least a part thereof. Is opened at a position overlapping the chain guide in a plan view, so that an effect is obtained that the oil can be smoothly injected from the oil filler port without increasing the cost.

According to the second aspect of the present invention, the end of the head cover on the side where the oil filler port is opened has two chevron shapes along the sprocket, and the oil filler is formed in the valley between the two chevron portions. Since the mouth is opened, the rigidity of the head cover is increased, so that the engine noise can be reduced and the height of the filler cap can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of an end portion of an internal combustion engine having an oil filler structure according to the present invention, with a head cover removed.

FIG. 2 is a longitudinal sectional view of an end of an internal combustion engine having an oil filler structure according to the present invention.

FIG. 3 is a view in the direction of arrow A in FIG. 2;

FIG. 4 is a plan view of the end of an internal combustion engine having a conventional oil filler structure with a head cover removed.

FIG. 5 is a longitudinal sectional view of an end portion of an internal combustion engine having a conventional oil filler structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Head cover 2a Angle part 2b Boss part 4 Intake camshaft 5 Exhaust camshaft 6,7 Sprocket 8 Chain 9 Chain guide 10 Oil filler port

Claims (2)

[Claims] 1. A chain for connecting a sprocket to each end of an intake / exhaust camshaft arranged in parallel with each other on a cylinder head, and abutting and guiding the chain wound between the two sprockets. With a guide,
In an internal combustion engine having an oil filler port opened in a head cover, the oil filler port is located above the chain guide between the intake and exhaust cam shafts of the head cover, and at least a part of the oil filler port is connected to the chain guide in plan view. An oil filler structure for an internal combustion engine, wherein the oil filler structure is opened at an overlapping position. 2. An end of the head cover on the side where the oil filler port is opened has two chevron shapes along the sprocket, and the oil filler port is opened at a valley between the two chevron parts. The oil filler structure for an internal combustion engine according to claim 1, wherein: