JP2551971Y2 - Oil sump structure of cylinder head - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an oil sump formed in a cylinder head of an engine having an overhead camshaft type valve operating mechanism.

[0002]

2. Description of the Related Art For example, in a diesel engine,
Cylinder head with a camshaft-type valve mechanism with a camshaft that is driven to rotate in synchronization with the rotation of the link shaft ,
An oil sump is provided on the upper surface of the cylinder head to prevent abrasion of the valve lifter and the cam contacting the valve lifter before the lubricating oil is supplied to the cam after the engine is started. The valve lifter and the cam are lubricated with the oil in the oil pool.

[0003] An oil reservoir in a conventional cylinder head will be described.

FIG. 4 shows an example of an upper surface of a cylinder head used in an engine having an overhead camshaft type valve operating mechanism. In the figure, reference numeral 1 denotes a cylinder head. The cylinder head 1 has a cylinder axis of an engine which is vertical or substantially vertical.
It is mounted on the vehicle in a straight state. The cylinder head 1 is provided with a pair of valves respectively corresponding to a plurality of cylinders formed on a cylinder block (not shown) provided below the cylinder head 1. A plurality of valve lifter holes are provided in accordance with the arrangement of the valves. 2 are formed in a line. A valve lifter 3 is inserted and held in these valve lifter holes 2 so as to be able to move up and down, and a valve (not shown) used as an air supply valve and an exhaust valve is attached to each valve lifter 3. Reference numeral 4 denotes a camshaft provided on the upper side of the cylinder head 1. The camshaft 4 has a plurality of cams 5 for driving the valve lifters 3 corresponding to the respective valve lifters 3.

Conventionally, in a cylinder head, an oil sump is formed common to a plurality of valve lifter holes 2. This configuration will be described with reference to FIGS. A peripheral wall 6 is formed upright on the entire periphery of the upper surface of the cylinder head 1, and a valve lifter 3 attached to a pair of valves corresponding to each cylinder formed on the cylinder block is provided on the upper surface of the cylinder head 1. Projections 7 are formed between a pair of valve lifter holes 2 for holding the holes. Each protrusion 7 is formed from the inner surface on one side of the peripheral wall 6 to a position just before the inner surface on the other side of the peripheral wall 6 along the width direction of the cylinder head 1. Further, a rib 8 is formed on the upper surface of the cylinder head 1 by connecting the respective side surfaces of a pair of protrusions 7 adjacent to each other. An oil reservoir 9 is formed by surrounding the peripheral wall 6, the protrusion 7, and the rib 8 with two adjacent valve lifter holes 2. The oil O is stored in the oil sump 9.

[0006]

The structure of such a conventional oil sump has the following problems.

[0007] Diesel engines are mounted on the body of a car such as a truck at an angle in the front-rear direction .
The vehicle is mounted on the vehicle with the cylinder axis substantially vertical. ) There are things. In this case, the cylinder head 1 is also inclined as shown in FIG.
Oil O flows to the lower side of the cylinder head 1 and accumulates unevenly. Therefore, the valve lifter 3 held in the valve lifter hole 2 located on the lower side of the oil reservoir 9 in which the oil O has accumulated is lubricated by the oil O. However, since no oil exists in the upper part of the oil sump 9, the valve lifter 3 held in the valve lifter hole 2 located in the upper part of the oil sump 9 is not lubricated.

Therefore, there is a valve lifter and a cam that are not lubricated before the oil is supplied to the cam 5 of the camshaft 4 after the engine is started.

The present invention has been made in view of the above circumstances, and provides an oil sump structure of a cylinder head which can lubricate all valve lifters of valves provided on a cylinder head after starting of an engine and a cam contacting the valve lifter. With the goal.

[0010]

Means for Solving the Problems] oil reservoir structure of the present invention the cylinder head in order to achieve the object, the engine
Mounted on the vehicle with the cylinder axis vertical or almost vertical
Is, in sheet cylinder head having a valve operating mechanism for opening and closing the valve through a valve lifter by a cam shaft which is rotationally driven in synchronism with rotation of the crankshaft, ridges on the upper surface of the cylinder <br/> Daheddo And a plurality of holes formed in the cylinder head for inserting and holding the valve lifter are individually formed and oil sumps surrounding the entire circumference thereof are formed.
It is characterized by the following.

[0011]

[Action] A convex ridge is provided on the upper surface of the cylinder head,
For each valve lifter hole, an oil sump is formed surrounding the valve lifter hole, and the oil stored in each oil sump is
The valve lifter and the cam that contacts the valve lifter are lubricated individually for each valve lifter hole. For this reason, even if the engine is mounted on the vehicle body at an angle, the valve lifters held in all the valve lifter holes and the cams that come into contact with the valve lifters can be lubricated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

This embodiment is directed to the cylinder head shown in FIG. 1 to 3, the same parts as those in FIG. 4 are denoted by the same reference numerals.

FIGS. 1 to 3 show a part of an oil sump of the cylinder head 1 in an enlarged manner. Note that in FIG.
Numeral 0 denotes a valve, which is provided in a valve hole 11 formed continuously below the valve lifter hole 2 in the cylinder head 1 so as to be movable up and down. A compression coil spring 12 applies an upward force to the valve 10. Reference numeral 13 denotes, for example, an air supply passage formed in the cylinder head 1. Reference numeral 14 denotes a cylinder block, and 15 denotes a cylinder formed in the cylinder block 14.

The oil sump of this embodiment will be described.

On the upper surface of the cylinder head 1, both sides of a protrusion 7 formed between a pair of valve lifter holes 2 corresponding to the cylinders 15 of the cylinder block 14, Peripheral wall 6 of cylinder head 1
Of the projection 7 and the cylinder head 1
A rib 16 is formed along the periphery of the valve lifter hole 2 sandwiched between the inner surface of the peripheral wall 6 of the valve lifter. Thus, the peripheral wall 6, the projection 7, and the rib 16 form an oil reservoir 17 that surrounds the entire periphery of the opening of the single valve lifter hole 2. That is, the oil sump 17 can be individually formed in each of the pair of valve lifter holes 2 located on both sides of the projection 7. In this embodiment, the peripheral wall 6, the protrusion 7, and the rib 16 are
Corresponds to the raised ridge standing on the upper surface of the cylinder head 1.
You. That is, the upper surface of the cylinder head 1, the sheet
Peripheral wall which is a raised ridge standing on the upper surface of the Linda head 1
6, all the valve lifter holes 2 formed in the cylinder head 1 are individually and entirely formed by the projections 7 and the ribs 1.
A plurality of oil sumps 17 are formed around each circumference .

Then, oil 0 is individually stored in each of the oil reservoirs 17 formed for each of the valve lifter holes 2.

The engine having the cylinder head 1 of this embodiment is mounted on the body of an automobile so as to be inclined in the front-rear direction.
(Mounted on the vehicle with the cylinder axis substantially vertical.) Thereby, the cylinder head 1 is also inclined in the front-rear direction as shown in FIG. Here, the upper surface of the cylinder head 1
Oil sump surrounding each valve lifter hole 2 individually and all around
The oil O is individually stored in each of the oil sumps 17. That is, each valve lifter hole
For every two, a ridge portion erected on the upper surface of the cylinder head 1
Surrounded by the wall of the peripheral wall 6, the protrusion 7 and the rib 16.
Oil is stored in the formed oil sump 17, and the stored oil is
It is shielded by the wall of the peripheral edge wall 6, the protruding portion 7, and the rib 16, and is directed to the outside.
It is prevented from flowing out. For this reason, lubricating oil is ensured for each valve lifter hole 2 irrespective of the inclination of the cylinder head 1. As a result, the valve lifter 3 and the valve lifter 3 provided in each valve lifter hole 2 until oil is supplied to the cam 5 of the camshaft 4 after the engine is started.
Is lubricated by the oil O stored in each oil sump 17. That is, the valve lifters 3 held in all the valve lifter holes 2 provided in the cylinder head 1 and the cams 5 contacting the valve lifters 3 can be lubricated. Obedience
Therefore, not only is the engine cylinder axis vertical,
When the vehicle is mounted almost vertically so that it tilts to the left and right
Even after the engine has stopped,
Lubricating oil is actually retained, and there is no lubrication when starting the engine
Without damage to the lifter
The drive loss of the lubricator can be reduced.

The present invention can be implemented in various modifications without being limited to the above-described embodiment. For example, oil sump 17
Is not limited to the embodiment. In short, it is sufficient that the oil sump 17 can be formed by individually surrounding each of the valve lifter holes 2.

[0020]

As described above, according to the cylinder head oil sump structure of the present invention, the upper surface of the cylinder head
Each of the valve lifter holes formed in the cylinder head with the raised ridges formed individually and an oil reservoir surrounding the entire circumference
Therefore, lubricating oil can be secured for each valve lifter hole regardless of the inclination of the cylinder head. Therefore,
Not only when the cylinder axis is vertical, but also
Even when mounted on a vehicle in a nearly vertical state so as to incline,
Reliable lubrication around each valve lifter after engine stop
Oil is retained and no lubrication occurs at engine start
To prevent lifter damage beforehand and to increase valve lift
The drive loss of the motor can be reduced.

[Brief description of the drawings]

FIG. 1 is a top view showing an oil reservoir of a cylinder head according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line ZZ in FIG. 1;

FIG. 3 is a sectional view taken along the line YY of FIG. 1;

FIG. 4 is a plan view showing the upper surface of the cylinder head.

FIG. 5 is a top view showing an oil reservoir of a conventional cylinder head.

FIG. 6 is a sectional view taken along line XX of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylinder head, 2 ... Hole for valve lifter, 3 ... Valve lifter, 4 ... Cam shaft, 5 ... Cam, 6 ... Peripheral wall, 7 ... Projection, 16 ... Rib, 17 ... Oil reservoir.

Claims (1)

(57) [Scope of request for utility model registration] 1. The cylinder axis of an engine is vertical or
Is mounted on the vehicle almost vertically and synchronized with the rotation of the crankshaft
And the sheet cylinder head having a valve operating mechanism for opening and closing the valve through a valve lifter by a cam shaft which is driven to rotate, vertically arranged ridges on the upper surface of the cylinder head
Then, a plurality of holes formed in the cylinder head for inserting and holding the valve lifter are individually and entirely formed.
An oil sump structure for a cylinder head, wherein a surrounding oil sump is formed .