JPS603294Y2 - Valve mechanism lubrication device - Google Patents

Description

[Detailed description of the invention] The present invention uses a method in which lubricant pumped by an oil pump is lubricated by rotating centrifugal droplets through an oil jet hole in a camshaft in a DHC or rocker arm type valve mechanism of an internal combustion engine. , especially regarding the lubrication of valve stem ends and tanker shafts.

In this type of valve mechanism, a camshaft slides against one end of a rocker arm supported in a balance type, and the stem end of the valve contacts an adjustment screw at the other end, and the rotation of the camshaft causes the rocker arm to swing, thereby rocking the valve. It opens and closes by moving it.

The lubrication method in this case is mainly a pressure-feeding splash method in which an oil passage through which lubricating oil is pumped to the camshaft is connected to an oil jet hole, and oil is sprayed from this oil jet hole while rotating and supplied to each part. has been adopted.

As a prior art of this method, for example,
The one described in the 653 Publication is known.

With this method, the area near the camshaft is sufficiently lubricated, but there are protrusions such as valve spring retainers and rocker arm bearings in the contact area between the adjustment screw and the valve stem end, which is located farthest from the camshaft. In some cases, sufficient oil droplets can reach the surface, making it easy to lack lubrication.

In addition, since the rocker shaft that supports the rocker arm is fitted with the rocker arm, it is not possible to supply the above-mentioned splashed oil. Oil is supplied separately.

In view of these circumstances, the present invention eliminates the protrusion and flattens the bearing part of the rocker arm, which protrudes between the camshaft and the valve stem end, by cutting out a part of it and forming an open window. The oil droplets from the camshaft are sufficiently and reliably supplied to the contact area between the adjustment screw and the valve stem end through the window, and at the same time, the oil is also supplied between the rocker shaft and the rocker arm through the window. The present invention provides a lubrication device for a valve mechanism that eliminates the problem of insufficient lubrication at a stem end and eliminates the need for a dedicated oil supply hole for rocker shaft lubrication.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In the figure, numeral 1 is a cylinder head, 2 is a hemispherical combustion chamber formed therein, and between this combustion chamber 2 and intake and exhaust ports 3 and 4, intake and exhaust valves 5 and 6 are shaped like a square. A valve operating mechanism 8 is provided on the end side of these valves 5 and 6 and housed in a rocker cover 7.

In the valve operating mechanism 8, a camshaft 9 is rotatably provided between the valves 5 and 6, and one end of a rocker arm 11 supported by a rocker shaft 10 in a balance type is in contact with the camshaft 9.

Further, an adjustment screw 12 is fastened to the other end of the rocker arm 11 with a lock nut 13 to prevent it from being removed.
This screw 12 is the stem end 5 of the valve 5 on the intake side.
A valve spring 15 is interposed between the cylinder head and a retainer 14 attached near the stem end 5a to interlock the valve 5 with respect to the camshaft 9. .

On the other hand, in exactly the same way, in the exhaust side valve 6, the adjustment screw 18 at one end of the rocker arm 17 supported by the rocker shaft 16 is in contact with the stem end 6a, and the retainer 19 near the stem end 6a and the cylinder head 1 are in contact with the stem end 6a.
A valve spring 20 is interposed between the camshaft 9 and the camshaft 9.
The valve 6 is interlocked with respect to the above.

Then, due to the rotation of the camshaft 9, the rocker arm 11.17
The valves 5 and 6 are opened and closed by swinging and moving the intake and exhaust valves 5 and 6.

Next, to explain the lubricating device which is the main focus of the present invention in such a valve train mechanism 8, an oil passage 21 is provided in the center of the camshaft 9 for pumping lubricating oil from an oil pump, and oil is ejected in the radial direction. The holes 22 are arranged in series, and the camshaft 9
When the oil spout hole 22 rotates, the oil spout hole 22 also rotates, and oil is sprayed from there over the entire surrounding area.

In addition, as detailed in FIG. 2, in the bearing portion 11a that supports the camshaft 10 of the rocker arm 11, there is a center portion of the lower part protruding between the camshaft 9 and the stem end 5a of the valve 5. Window 2 that opens by cutting out a part of it
3 is formed, and a portion of the bearing portion 11a is flattened by the window 23 so that it no longer protrudes between the camshaft 9 and the stem end 5a, and a portion of the rocker shaft 10 is exposed.

Similarly, a window 24 is formed in the bearing portion 17a of the other rocker arm 17 so that it no longer protrudes between the camshaft 9 and the stem end 6a of the valve 6, and the rocker shaft 1
A part of 6 is exposed.

Since the present invention is constructed in this manner, when the camshaft 9 rotates during engine operation, the rocker arm 11.17 swings and the suction and exhaust valves 5 and 6 move, thereby causing the suction and exhaust valves 5 and 6 to move.
The exhaust ports 3 and 4 open and close at predetermined valve timing.

At this time, the lubricating oil force-fed to the oil passage 21 of the camshaft 9 is spouted from the oil spout hole 22 while rotating, so that it is splashed all over the periphery of the camshaft 9, and this splashed oil is sprayed onto the camshaft 9.
The contact parts of one end of the rocker arm 11, 17 near the valves 5, 6, etc. are immediately supplied and lubricated.

On the other hand, the bearing part 11a in the middle of the rocker arm 11 is flattened by the window 23, and a gap is formed between the camshaft 9 and the stem end 5a of the valve 5 located far away, so that the above-mentioned A large amount of the splashed oil also reaches the contact area between the stem end 5a of the valve 5 and the adjustment screw 12.

Also, the camshaft side of the bearing portion 11a of the rocker arm 11 is the window 2.
3, a part of the rocker shaft 10 is exposed, so the splashed oil is directly supplied to the rocker shaft 10 through this window 23, and thus the valve stem end 5a and the rocker shaft 10 are sufficiently and reliably lubricated.

Next, a window 24 is formed in the bearing portion 17a of the other rocker arm 17, so that splashed oil is similarly supplied to the stem end 6a of the valve 6 and the rocker shaft 16 to lubricate it.

As described above, according to the present invention, when each part of the valve mechanism 8 is lubricated by the forced droplet method from the camshaft 9, the droplet oil is also applied to the stem ends 5a and 6a of the intake and exhaust valves 5 and 6, which are far from the camshaft 9. Since the lubricant is supplied sufficiently and reliably, the fear of insufficient lubrication is completely eliminated.

Also, rocker arm 11.17 used during the above lubrication.
Since the rocker shaft 10.16 is also lubricated using the windows 23 and 24, it is not necessary to drill an oil supply hole for this lubrication.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the device according to the present invention, and FIG. 2 is a view taken in the direction of the arrow ■ in FIG. 5... Intake valve, 6... Exhaust valve, End... Valve mechanism, 9... Camshaft, 10
...Rocker axis, 11...Tatsuka arm,
12... Adjustment screw, 16...
・Rocker shaft, -17...Rocker arm, 18・
...Adjust screw, 21...Oil passage, 22...Oil spout hole, lla, 17a...
... Bearing part, 23.24 ... Window, 5 a,
6 a... Stem end.

Claims (1)

[Scope of utility model registration request] One end of the rocker arm, which is supported in a balance manner on the rocker shaft, slides into contact with the camshaft, and the stem end of the valve is brought into contact with the adjustment screw at the other end, so that an oil jet hole is formed in the oil passage that pumps lubricating oil on the camshaft. A window is formed by cutting out a portion of the bearing section that supports the camshaft of the rocker arm so that the oil sprayed from the oil spout hole lubricates each part, and the oil of the camshaft passes through the porthole. A valve train mechanism characterized in that oil splashed from the jet hole is supplied to the abutting portion of the adjustment screw and the valve stem end, and at the same time, oil is also supplied to the space between the rocker shaft and the rocker arm through the window to lubricate the space between the rocker shaft and the rocker arm. Lubrication device.