JPH0115846Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a vertical crankshaft engine in which the crankshaft is arranged vertically, and more particularly to a lubrication structure around a valve arm shaft arranged in the vertical direction.

BACKGROUND ART Generally, in a so-called vertical crankshaft engine, as shown in FIG. Therefore, there are two upper and lower valve arms 3a,
3b is held rotatably in the horizontal direction.

As means for lubricating these valve arms 3a and 3b, there are two methods: forcibly supplying lubricating oil, and lubricating oil droplets (moisture oil) suspended in the atmosphere.
There is a way to use it. However, in the former case, the structure is complicated and the cost is high, so the latter is generally adopted.

In addition, in the case where the valve arm shaft is arranged horizontally, a large oil receiving hole is provided on the side surface of the valve arm shaft, and the lubricating oil droplets collected by this oil receiving hole are passed through the valve arm shaft. Some are designed to lead to the arm sliding part.

Problems to be Solved by the Invention However, in the conventional technology that uses moisturizing oil, a sufficient amount of lubricating oil is not always supplied to the necessary locations, and in particular, the valve arm shaft 1, the valve arm 3a,
There was a problem in that the supply of lubricating oil to the sliding part with 3b was insufficient, causing seizure or abnormal wear.

The above-mentioned conventional technology in which a large diameter oil receiving hole is opened on the side surface of the valve arm shaft is designed to collect as much lubricating oil as possible by providing such a large diameter oil receiving hole. However, if this is done, there is a risk that the strength of the valve arm shaft will be insufficient due to the large diameter oil receiving hole, and in order to provide the oil receiving hole, only the portion of the oil receiving hole must be removed. The valve arm shaft must be exposed, which has the disadvantage that the length of the valve arm shaft in the axial direction becomes long. Moreover, since the size of the oil receiving hole is limited, it is not always possible to collect sufficient lubricating oil droplets, and the fear of lubricating oil shortage cannot be completely resolved.

An object of the present invention is to provide a valve arm lubrication structure that solves these problems.

Means for Solving the Problems The present invention is a vertical crankshaft engine in which the crankshaft is arranged in a vertical direction. A small hole provided inside the valve arm shaft is opened in the valve arm sliding surface of the valve arm shaft so as to communicate with the lubricating oil reservoir, and an oil reservoir is further provided in the upper part of the valve arm shaft. The lubricating oil reservoir is characterized in that the oil reservoir is provided with a small hole through which the lubricating oil drops toward the open portion of the lubricating oil reservoir.

Embodiment 1 FIG. 2 shows a partial sectional view of a vertical crankshaft engine. As shown in the figure, a piston 6 is slidably inserted into a cylinder 5 in which a crankshaft 4 is vertically arranged and is oriented laterally. In a cylinder head 8 fixed to a cylinder block 7 so as to close the cylinder 5, an intake valve 9 and an exhaust valve 10 are arranged horizontally with a vertical interval. An upper valve arm 11 and a lower valve arm 12 are provided horizontally on the valve stem end sides of these intake and exhaust valves 9 and 10. These upper and lower valve arms 11, 12
are substantially perpendicular to the intake/exhaust valves 9 and 10.

Further, as shown in FIG. 1, a valve arm shaft 14 is attached to a valve arm support base 13 which is fixed to the cylinder head 8 so as to protrude laterally with respect to the cylinder head 8. It is fixed so that it protrudes. Above and below the valve arm shaft 14, the upper valve arm 11 and the lower valve arm 12 are attached to be horizontally rotatable. As shown in FIG. 4, an intake valve 9 is provided on the distal end side of the upper valve arm 11.
A stem end portion 15 is disposed adjacent to the valve arm head 16 of the upper valve arm 11, and a push rod 17 is connected to the proximal end. Similarly, the stem end portion 15 of the exhaust valve 10 is disposed adjacent to the valve arm head 16 on the distal end side of the lower valve arm 12, as shown in FIG. A push rod 17 is connected to the end side. These upper and lower valve arms 11 and 12 are
In conjunction with the two push rods 17, 17,
The valve arm sliding surfaces 18, 18 on the outer periphery of the valve arm shaft 14 are adapted to slide in the horizontal direction.

On the other hand, inside a head cover 19 attached to the cylinder head 8, a valve arm chamber 21 formed by the head cover 19 and the cylinder head seat surface 20 is provided. An oil reservoir 22 is provided above the valve arm chamber 21 and above the valve arm shaft 14 . This oil sump 22 is located in the head cover 1
As shown in FIG. 1, on one side of the upper rib 23, which is formed in a curved shape projecting downward, there is an upper valve arm 1.
The opening 2 is positioned above the valve arm head 16 of the valve arm 1.
4 is provided, and the other side is provided with a head cover 1.
It is integrated with the surrounding wall 25 of 9. Further, the valve arm shaft 1 is provided at the bottom of the curved upper rib 23.
A small hole 26 is provided facing the top of 4. A portion of the lubricating oil in the oil reservoir 22 falls through this small hole 26 toward the lubricating oil reservoirs 30 and 31 opened at the upper end of the valve arm shaft 14.

Next, the valve arm shaft 14 disposed below the small hole 26
We will explain the structure of

The valve arm shaft 14 is arranged in the vertical direction as described above.
is formed into a cylindrical shape as shown in FIG. 1, and its lower end is closed by a plug 27.
The upper lubricating oil reservoir 3
0 and a lower lubricating oil reservoir 31 are formed separately. That is, a part of the lubricating oil that has fallen from the small hole 26 flows into the lower lubricating oil reservoir 31 through the inside of the cylindrical part 32 of the tube-shaped partition member 28, and the rest flows into the upper lubricating oil reservoir 31 outside the cylindrical part 32. The oil flows into the oil sump 30. An oil hole 33a opened in the valve arm sliding surface 18 facing the upper valve arm 11 on the upper side of the valve arm shaft 14 passes through the valve arm shaft 14 and communicates with the upper lubricating oil reservoir 30. The oil hole 33
The lubricating oil passing through a lubricates the sliding portion with the upper valve arm 11. Similarly, an oil hole 33b opened in the valve arm sliding surface 18 facing the lower valve arm 12 communicates with the lower lubricating oil reservoir 31, and the lubricating oil passing through the oil hole 33b flows to the lower valve arm sliding surface 18. It is designed to lubricate the sliding portion with the valve arm 12.

On the other hand, the lubricating oil that has overflowed the oil reservoir 22 falls from the opening 24 on the side edge of the upper rib 23, and as shown in FIG. 15 and the sliding portion of the valve arm head 16 of the upper valve arm 11 is lubricated.

In addition, on the tip side of the upper and lower valve arms 11 and 12,
A middle rib 34 integral with the head cover 19 is provided between the upper valve arm 11 and the lower valve arm 12,
A notch 35 is formed in the middle rib 34 so as to be located above the valve arm head 16 of the lower valve arm 12. That is, the lubricating oil that has fallen from the oil reservoir 22 is collected in the notch 35 by the cylinder head seating surface 20 and the middle rib 34, and the lubricating oil that has fallen from the notch 35 is collected at the stem end of the exhaust valve 10. The sliding portion between the portion 15 and the valve arm head 16 of the lower valve arm 12 is lubricated.

Note that the upper surface 36 of the valve arm head 16 on the stem end portion 15 side may be cut diagonally as shown in FIG. By doing so, the lubricating oil adhering to the valve arm head 16 easily flows to the sliding portion with the stem end portion 15, thereby further reducing wear.

Embodiment 2 FIG. 7 shows another embodiment of the present invention. In this embodiment, a shallow dish-shaped lubricating oil reservoir 3 is provided at the top of the valve arm shaft 14.
7 is provided, and the valve arm sliding surface 1 between the upper valve arm 11 and the lower valve arm 12 is formed from the bottom surface 38 of the lubricating oil reservoir 37.
Oil holes 39a and 39b communicating with 8 and 18, respectively
I am trying to set it up. And the upper valve arm 11
An inwardly tapered portion 40 is provided on the upper side surface of the upper valve arm 11 so that the lubricating oil adhering to the upper valve arm 11 is removed from the lubricating oil reservoir 3.
7 to lubricate the upper valve arm 11 and the lower valve arm 12 through oil holes 39a and 39b, respectively.

Effects of the Invention As described above, the present invention provides a lubricating oil reservoir in the valve arm shaft, and an oil hole provided inside the valve arm shaft so as to communicate with the lubricating oil reservoir. Since the opening is on the sliding surface of the arm, lubricating oil can be reliably supplied to the sliding part between the valve arm shaft and the valve arm, preventing seizure and abnormal wear with a simple structure. It became.

In particular, in the present invention, an oil reservoir is provided above the valve arm axis,
The lubricating oil is made to fall through a small hole formed in this oil reservoir into a lubricating oil reservoir opened at the upper end of the valve arm shaft, and this oil reservoir is formed in the cylinder head cover etc. as shown in the example. By the way,
Unlike the case where oil droplets are collected in an oil receiving hole provided on the valve arm shaft, it is possible to form a large opening for the oil receiving, and the lubricating oil accumulated in this oil reservoir can be
The lubricating oil is reliably supplied to the lubricating oil reservoir side from the small hole, and the lubrication of the valve arm sliding part is much better than that of the conventional one. Moreover, when receiving the lubricating oil that has fallen from the small hole, the opening part is opened at the upper end of the valve arm shaft, so unlike the case where the oil receiving hole is formed on the side surface of the valve arm shaft, the opening part is opened at the upper end of the valve arm shaft. Since there is no risk of loss of strength and there is no need to expose the side surface of the valve arm axis, there is an effect that the valve arm does not become elongated in the axial direction.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of essential parts showing one embodiment of the present invention, FIG. 2 is a partial cross-sectional view showing the entire vertical crankshaft engine, FIG. 3 is a longitudinal cross-sectional view taken along the line A-A in FIG.
Fig. 4 is a longitudinal cross-sectional view taken along line B-B in Fig. 1, Fig. 5 is a longitudinal cross-sectional view taken along line C-C, Fig. 6 is a cross-sectional view of essential parts showing an example of the valve arm head, and Fig. 7 is a longitudinal cross-sectional view taken along line C-C in Fig. 1. FIG. 8 is a schematic vertical cross-sectional view showing another embodiment of the present invention, and FIG. 8 is a schematic vertical cross-sectional view showing a conventional example. 14... Valve arm shaft, 18... Valve arm sliding surface, 20...
...Oil sump, 26...Small hole, 30...Upper lubricating oil sump,
31... Lower lubricating oil reservoir, 33a, 33b... Oil holes.

Claims (1)

[Scope of utility model registration request] In a vertical crankshaft engine in which the crankshaft is arranged in a vertical direction, a lubricating oil reservoir is provided in the valve arm shaft arranged in the vertical direction and is open to the upper end side of the valve arm shaft, and the lubricating oil reservoir is communicated with the lubricating oil reservoir. an oil hole provided inside the valve arm shaft is opened on the valve arm sliding surface of the valve arm shaft, and an oil reservoir is further formed above the valve arm shaft;
A valve arm lubrication structure for a vertical crankshaft engine, characterized in that the oil reservoir is provided with an oil hole through which lubricating oil drops toward the open portion of the lubricating oil reservoir.