JP2580163Y2 - Lubrication structure of valve gear - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating structure for a valve train for transmitting power between an intake valve or an exhaust valve of an internal combustion engine and a camshaft.

[0002]

2. Description of the Related Art Conventionally, an intake valve and an exhaust valve are housed and arranged in a cylinder head of an internal combustion engine, and a tappet, a push rod, a rocker arm (valve arm) is rotated by rotation of a cam shaft.
, The valve stem of the intake valve or the exhaust valve is slid up and down to open and close the valve.The rocker arm discharges lubricating oil from an oil hole provided in the rocker arm shaft, and the rocker arm, the valve stem and the pusher. Lubrication was applied to sliding parts such as rods and bearing parts. For example, this is a technique disclosed in Japanese Utility Model Publication No. 63-45526.

[0003]

With such a conventional lubricating structure, since the discharge amount of the lubricating oil is determined by the oil clearance, when the temperature of the lubricating oil is low at the time of starting or the like, the lubricating oil is discharged from the oil hole. There is also a method in which oil is hardly discharged and lubricating oil is jetted by connecting holes intermittently. However, when the lubricating oil temperature rises, the discharge amount is too large and the following problems occur. That is, if the discharge amount is too large, it is difficult to separate the blow-by gas and the lubricating oil from the breather, and the oil from the valve stem often drops, and the lubricating oil burns in the valve seat and the combustion deposits are generated in the gap between the seat and the valve. In some cases, it was not possible to reliably suck and exhaust. Also,
If the amount of lubrication is too small, there is a problem that the valve and the valve guide wear and the push rod also wears. The present invention solves such a problem of the lubrication structure of the conventional valve gear.

[0004]

Means for Solving the Problems The present invention is configured as follows in order to solve the above problems. Shi
Rocker arm on rocker arm axis 2 laid on the Linda head
The rocker arm shaft 2 is rotatably supported by the
In the valve gear having the lubricating oil passage 2a, the lubricating oil passage 2
rocker arm that communicates with the outer peripheral surface of the rocker arm shaft 2
A lubrication hole 2b is formed, and the lubricating oil is supplied to the boss of the rocker arm 1.
The oil hole 1b to be discharged from the portion 1a to the outside is
And the rocker arm lubrication hole 2b and the oil hole 1b
Is fixed at a position shifted in the axial direction of the rocker arm shaft 2.
Arrange them at intervals, and make both holes out of the rocker arm shaft 2.
The peripheral surface is connected by a minute groove 2c provided in parallel with the axis, and the minute groove
2c is formed by embossing .

[0005]

By using such means, the lubricating oil from the lubricating oil passage 2a lubricates the pivotal support with the rocker arm 1 from the rocker arm lubrication hole 2b and reaches the minute groove 1c (2c) from the rocker arm lubrication hole 2b. Then, the pressurized oil is squeezed out and blows out from the oil hole 1b onto the boss 1a of the rocker arm 1 to lubricate the valve stem, the push rod and the like.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The problems to be solved by the present invention and the means for solving them are as described above, and the configuration of the embodiments will be described with reference to the attached drawings. 1 is a side view of the rocker arm having the lubrication structure of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a sectional view taken along the line AA in FIG. 1, FIG. 4 is an enlarged sectional view taken along the line BB in FIG. Is an enlarged cross-sectional view taken along the line CC in FIG.
FIG. 6 is an enlarged sectional view taken along line DD in FIG. 3, FIG. 7 is a side view of a rocker arm having another lubricating structure, and FIG. 8 is a sectional view taken along line EE in FIG.

In FIG. 1 and FIG. 2, a rocker arm 1 is housed in a cylinder head on a cylinder block, and the rocker arm 1 is rotatably supported on a rocker arm shaft 2 traversing the cylinder head. An adjusting bolt 3 is screwed into one end and fixed so as to be adjustable in position with a lock nut 4, and the lower end of the adjusting bolt 3 is brought into contact with the tip of a push rod (not shown), and the other end of the push rod is connected via a tappet. The cam shaft is brought into contact with a cam on the cam shaft, and the cam shaft is configured to rotate in synchronization with the crank shaft.

A lower end of the rocker arm 1 is in contact with a stem end 5a of a valve stem 5, which is fitted with a valve spring (not shown) to form a valve guide formed on a cylinder head. Inserted into
A valve head (not shown) is formed below the valve stem 5, and is brought into contact with a valve seat fitted in an intake hole or an exhaust hole opened in the cylinder head. In such a configuration, the camshaft is rotated by the rotation of the crankshaft, and the rocker arm 1 reciprocates like a seesaw via the push rod, and pushes the valve stem 5 to open and close the valve.

The rocker arm shaft 2 has an axial center
As shown in FIG. 3, an oil passage 2a is formed and formed in a pipe shape. At a rocker arm 1 pivotal support portion of the rocker arm arm shaft 2, as shown in FIGS. The lubrication hole 2b is opened through. On the outer peripheral surface of the rocker arm shaft 2 where the rocker arm lubrication hole 2b is located, a minute groove 2 having a V-shaped cross section in parallel with the shaft is provided.
In the boss portion 1a into which the rocker arm shaft 2 of the rocker arm 1 is inserted, the oil hole 1b is opened at a certain distance from the rocker arm oil hole 2b in the axial direction (radius) direction. The oil hole 1b and the rocker arm oil hole 2b are arranged so as not to directly communicate with each other. A minute groove 2c is provided between the oil hole 1b and the rocker arm oil hole 2b.
Although the lubricating oil can flow through the rocker arm 1, since the rocker arm 1 is rotated, it flows intermittently and flows when the positions of the oil hole 1b and the minute groove 2c coincide.

The minute groove 2 formed in the rocker arm shaft 2
c is stamped into a V-groove, and the outer periphery of the rocker arm shaft 2 is polished after quenching the shaft in order to ensure durability. Since it requires a lot of man-hours, it is processed before quenching. And since the grooves are formed by stamping, the life of the tool is extended, and even if the outer peripheral polishing margin is slightly changed, the area of the grooves does not change much, and the target amount of lubricating oil can be easily achieved. is there.

With this configuration, lubricating oil is sent to the oil passage 2a provided at the axis of the rocker arm shaft 2, and the gap (oil) between the rocker arm shaft 2 and the boss portion 1a of the rocker arm 1 is supplied through the rocker arm lubrication hole 2b. Clearance) and lubrication. On the other hand, the amount of lubricating oil from the rocker arm lubrication hole 2b to the minute groove 2c is narrowed by the minute groove 2c, flows out onto the boss 1a through the oil hole 1b, and travels along the upper surface of the rocker arm 1 to the valve stem 5a. The lubricating oil is supplied to the valve and the valve guide, the push rod, and the like to prevent abrasion. At this time, since the rocker arm 1 is reciprocated, the minute groove 2c and the oil hole 1
The supply is intermittently performed during the period b, thereby preventing the supply from becoming excessive.

As shown in FIGS. 7 and 8, the microgrooves 2c are not provided on the rocker arm shaft 2, but are formed on the inner surface of the boss 1a of the rocker arm 1 in the circumferential direction.
Are formed, and rocker arm lubrication holes 2b 'and 2b' are formed between the minute groove 1c and the oil passage 2a. Further, the boss portion of the rocker arm 1 at a position displaced from the rocker arm lubrication hole 2b is formed. '.1b' may be formed in an inverted C-shape so that lubricating oil is discharged to the valve stem 5 side and the adjustment bolt 3 side, and lubrication may be performed in the same manner as described above.

[0013]

[Effects of the Invention] The present invention is constructed as described above, and has the following effects. First, the lubricating oil lubrication amount is regulated by the minute groove 2c so as to be an optimal oil amount,
The wear of the valve, the valve guide, and the valve seat can be prevented, and the wear of the contact portion between the push rod and the rocker arm can be prevented. Second,
Since the microgrooves 2c are formed by stamping, they can be easily processed and formed.
Tool life, extending the tool life and slightly changing
Even so, the area of the groove did not change much,
The discharge amount of the lubricating oil can be easily achieved. Therefore,
Minimize the cost increase by forming the minute groove 2c.
I was able to suppress it.

[Brief description of the drawings]

FIG. 1 is a side view of a rocker arm having a lubrication structure according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view taken along line AA in FIG. 1;

FIG. 4 is an enlarged sectional view taken on line BB in FIG. 3;

FIG. 5 is an enlarged sectional view taken along the line CC in FIG. 3;

FIG. 6 is an enlarged sectional view taken along the line DD in FIG. 3;

FIG. 7 is a side view of a rocker arm having another lubrication structure.

FIG. 8 is a sectional view taken along line EE in FIG. 7;

[Explanation of symbols]

 1 Rocker arm 1b Oil hole 1c ・ 2c Micro groove 2 Rocker arm shaft 2 2a Oil passage 2b Rocker arm lubrication hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F01M 1/06 F01L 1/18 F01M 9/10

Claims (1)

(57) [Scope of request for utility model registration] 1. A rocker arm horizontally mounted on a cylinder head.
A rocker arm 1 is pivotally supported on a shaft 2 so as to be freely rotatable.
In a valve operating device in which the axis of the
Connecting the lubricating oil passage 2a and the outer peripheral surface of the rocker arm shaft 2
Through the rocker arm lubrication hole 2b through which the lubricating oil flows.
Oil hole 1 to be discharged outward from boss 1a of hook arm 1
b in the rocker arm 1 and the lubrication hole for the rocker arm.
2b and the oil hole 1b are displaced from each other in the axial direction of the rocker arm shaft 2.
At a fixed distance from each other, and lock both holes.
A minute groove 2c provided on the outer peripheral surface of the arm shaft 2 in parallel with the axis.
A lubricating structure for a valve train , wherein the microgrooves 2c are connected to each other and the minute grooves 2c are formed by embossing .