JP2000104626A - Cylinder head cover for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent oil leaking from an oil filler port from dropping onto a drive belt for accessories. SOLUTION: In a cylinder head cover 1 for an internal combustion engine, an oil filler port 3 is formed therein above a drive belt 23r accessories in an internal combustion engine, and a laterally projecting protrusion 4 is formed between the oil filler port 3 and the auxiliary drive belt 23. In this case, an oil receiver 5 opened upward for retaining oil OIL by a predetermined quantity is formed along a side surface 4a of the protrusion 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the shape of a cylinder head cover of an internal combustion engine in which an oil supply port for supplying oil into the engine is provided above an accessory driving belt.

[0002]

2. Description of the Related Art An injection port for oil to be injected into an engine such as an internal combustion engine is usually provided in a cylinder head cover, and the position of the injection port is set as shown in Japanese Utility Model Laid-Open No. 5-47318. For example, a camshaft that is set near a drive gear (or a sprocket) of a camshaft for the purpose of quickly performing the operation is widely known.

[0003] On the other hand, in the case of a recently developed hydraulic variable valve timing mechanism which is mounted near the drive gear (or sprocket) of a camshaft, a space for mounting the variable valve timing mechanism is provided. To ensure this, the cylinder head cover is partially protruded laterally to form a protruding portion. As a result, the protrusion is located below the oil inlet and above the accessory driving belt for driving the accessory of the engine.

[0004]

However, because of this, when the oil is injected into the oil inlet, the spilled oil is transmitted along the side surface of the protruding portion and dripped onto the auxiliary device driving belt, and the dripped oil is dropped. As a result, a slip of the accessory driving belt is caused, and there is a fear that the accessory cannot be driven sufficiently.

[0005]

SUMMARY OF THE INVENTION The present invention focuses on such a problem, and by providing an oil receiving portion on a protruding portion of a cylinder head cover, oil spilled from an oil inlet drops to an accessory driving belt. This is intended to prevent the user from doing so.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cylinder head cover for an internal combustion engine according to the present invention is provided with an oil inlet above an accessory drive belt in the internal combustion engine, and the oil inlet and the accessory drive. An oil receiving portion that opens upward and that can store a predetermined amount of oil is formed along the side surface of the projecting portion. Features.

[0007] With such a configuration, it is possible to avoid a situation in which the oil falling along the side surface of the protruding portion accumulates in the oil receiving portion and falls on the accessory driving belt located below the oil receiving portion. In order to simplify the production of the oil receiving portion, it is preferable to provide the oil receiving portion integrally with the projecting portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The engine as the internal combustion engine according to the present embodiment is a four-cylinder DOHC type engine. As schematically shown in FIG. 1, an intake valve and an exhaust valve (not shown) provided for each cylinder, and these intake valves And at least an intake cam 14 and an exhaust cam 13 for opening and closing the exhaust valve, and an intake camshaft 12 and an exhaust camshaft 11 for rotating the intake and exhaust cams 14, 13, respectively.

The intake camshaft 12 and the exhaust camshaft 11 are driven to rotate via a timing chain 16 by a crankshaft (not shown) disposed below the intake camshaft 12 and the exhaust camshaft 11. The exhaust camshaft 11 includes a sprocket 21
The intake camshaft 12 is connected to the sprocket 20 via the variable valve timing mechanism 4 so as to be able to change the relative rotational phase difference with the exhaust camshaft 11.

The variable valve timing mechanism 4 is driven by a hydraulic pump P and is of a hydraulic type utilizing a so-called swing cylinder structure, and is provided near one end of the camshafts 11 and 12. Specifically, a rotor (not shown) fixed to the intake camshaft 12, a cylindrical housing 18 rotatably fitted to the rotor, and an oil control valve for rotating the housing 18 with respect to the rotor 19, and the housing 18 is fixed to the sprocket 20.

Since the housing 18 constituting the variable valve timing mechanism 4 is disposed outside the sprocket 20, the variable valve timing mechanism 4 is not provided in order to secure a space for disposing the housing 18. As shown in FIGS. 2 and 5, a part of the cylinder head cover 1 is protruded from the side surface to form a semicircular protrusion 4 which is curved upward in a side view.

The oil injection port 3 provided in the cylinder head cover 1 is provided with a sprocket 20 provided on the intake camshaft 11 as shown in FIGS. It is located substantially above, and consequently, is located above the protrusion 4. On the other hand, this engine is provided with an accessory drive mechanism 2 as shown in FIG. The accessory drive mechanism 2 transmits the rotation of the crankshaft to accessories (not shown) such as an alternator, a hydraulic pump, a water pump, and an air conditioner compressor, and drives these accessories. And an auxiliary device pulley 22 fixed to the input shaft of each auxiliary device, and an auxiliary device drive belt 23 connecting the crankshaft pulley 24 to the input shaft of each auxiliary device. The auxiliary drive mechanism 2 is located below the protruding portion 4 because it is disposed on one end side of the crankshaft.

In this embodiment, the oil receiving portion 5 is provided integrally with the projection 4 provided on the cylinder head cover 1. The oil receiving portions 5 extend from the side surfaces 4a of the protruding portions 4 facing each other in the protruding direction along the first upright walls 4b, respectively, and have the same height as the upright side walls 4b at the end of the protruding portions 4. The second upright wall 4c is provided, and is formed between the upright walls 4b, 4c and the side surface 4a of the protruding portion 4 and has a concave shape that opens upward. The first standing wall 4b is provided over the entire projecting direction of the projecting portion 4, and the oil O falls along the side surface 4a of the projecting portion 4.
It is configured to receive all IL. The capacity of the oil receiving portion 5 is such that the oil OIL spilled accidentally at the beginning or at the end of oil injection can be stored once to several times due to space limitation or the like. It is preferable that the oil OIL accumulated in the oil receiving portion 5 after oil injection be wiped off.

In such a configuration, the oil OIL accidentally spilled at the beginning or end of the oil injection, for example, is used.
As shown in FIG. 6, the oil is transmitted from the outer surface of the oil inlet 3 to the side surface 4a of the protrusion 4 and accumulates in the oil receiving portion 5,
It will not flow down any further. Therefore, the oil OIL is applied to the accessory driving belt 23 located thereunder.
Can be avoided.

The present invention is not limited to the above embodiment. For example, the engine is not limited to a four-cylinder engine, and the type and shape of a cylinder head cover and the like can be variously modified. Regarding the shape and arrangement of the oil receiving portion, for example, in order to more completely prevent the oil from falling, an oil receiving portion having the same configuration may be provided on the side surface forming the tip of the projecting portion. . In addition, the present invention can be variously modified without departing from the gist thereof.

[0016]

As described in detail above, according to the present invention,
An oil receiving part that opens upward and can store a predetermined amount of oil,
Since the oil is formed along the side surface of the protrusion, even if oil is spilled when the oil is injected into the oil inlet, the oil is transmitted to the side surface of the protrusion and accumulates in the oil receiving portion, and is located below the oil receiving portion. It is possible to avoid a situation in which oil falls on the accessory driving belt.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an engine, particularly a camshaft, according to an embodiment of the present invention.

FIG. 2 is a partial plan view of the cylinder head cover in the embodiment.

FIG. 3 is an end view taken along line AA in FIG. 2;

FIG. 4 is an end view taken along the line BB in FIG. 2;

FIG. 5 is a schematic partial perspective view showing the cylinder head cover of the embodiment.

FIG. 6 is an operation explanatory diagram for explaining the operation of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Internal-combustion engine (engine) 23 ... Auxiliary drive belt 3 ... Oil injection port 4 ... Projection part 4a ... Side surface of a projection part 5 ... Oil receiving part

Continued on front page F-term (reference) 3G015 AA06 AA07 CA05 DA01 DA04 EA00 3G024 AA72 BA23 BA29 DA10 DA18 FA00 FA07 FA14

Claims (1)

[Claims] An oil inlet is provided above an accessory drive belt in an internal combustion engine, and a projecting portion is formed between the oil inlet and the accessory drive belt to protrude laterally. A cylinder head cover for an internal combustion engine, wherein an oil receiving portion opened upward and capable of storing a predetermined amount of oil is formed along a side surface of the projecting portion.