JPS6341527Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention belongs to the technical field of lubrication pumps for vertical engines.

<Prior art> As a prerequisite configuration, the present invention has a vertical engine 1 as shown in FIGS. 1 to 7, for example.
A rotary shaft T is vertically supported in the crank chamber 2 of the rotary shaft T, and integrally attached to the bottom wall 11 of the crankcase 3 at the location where the lower end of the rotary shaft T is pivotally supported. The pump chamber 12 is recessed into a shape with an opening on the lower surface, and the pump element 13 is assembled into the pump chamber 12 so as to be interlocked with the rotation axis T. The opening on the lower surface of the pump chamber 12 is covered with a bottom cover 14 to operate the lubrication pump. Concerning what was made to form.

Conventionally, in this type of lubricating pump, as shown in FIG. 7, the suction hole 18 of the pump 9 has been formed in a substantially vertical shape, and the end opening thereof has been opened upward.

<Problems to be Solved by the Invention> Such a pump sucks in dust such as metal powder flowing down from above, causing early wear of the lubrication pump P, resulting in a decrease in lubrication performance and durability.

Moreover, since the suction hole 18 is provided vertically, the height H from the bottom wall 11 of the crank chamber 2 storing lubricating oil to the opening of the suction hole 18 increases, and if the engine 1 is tilted, the suction hole Since the opening 18 is exposed above the lubricating oil surface, the tilting performance of the engine is poor.

The present invention aims to solve the above problems.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention provides a crank chamber 2 as shown in FIGS.
Pump chamber 12 on the chamber center position G side on the cross-sectional plan view of
The suction port 16 is recessed at a location extending from the top surface to the circumferential surface, and the boss 20 is extended from the circumferential wall 16a of the suction port 16 toward the chamber center position G, so that the tip surface 20a of the boss 20 is made substantially vertical. A suction hole 18 extending from the circumferential wall 16a of the suction port 16 through the inside of the boss 20 to the top end surface 20a of the boss is provided at a position where it can be formed by drilling from the lower opening of the pump chamber 12. It is something.

<Effects> Since the present invention is constructed as described above, it has the following effects.

That is, since the end opening of the suction hole of the lubrication pump is opened from the pump chamber to the almost vertical end surface of the boss formed near the center of the crank chamber, dust flowing down from the crank chamber can be sucked directly into the suction hole. can be prevented. This prevents early wear of the lubrication pump and maintains high lubrication performance over a long period of time.

Moreover, since the end opening of the suction hole is formed on the vertical tip surface of the boss, the height of the end opening can be made much lower than that of the conventional example, and the boss is located at the center of the crank chamber. Since it is extended closer to the position, even when the engine is tilted, the opening of the suction hole can be prevented from being exposed on the lubricating oil surface, and the tilting performance of the engine can be greatly improved.

In addition, a suction port is recessed from the top surface of the pump chamber to the circumferential surface, and a boss is extended from the circumferential wall of the suction port so that the suction port passes through the boss from the circumferential wall of the suction port to the boss tip surface. The suction hole that reaches up to the bottom of the pump chamber is located at a position where it can be formed by drilling from the bottom opening of the pump chamber, so the suction hole can be easily formed by drilling from the bottom opening of the pump chamber. It can be manufactured at low cost.

<Example> An example of the present invention will be described below based on the drawings.

FIG. 1 shows a cross-sectional plan view of a vertical engine. This engine 1 has a cylinder block 4 and an intake/exhaust block 5 integrally formed on the left side of a crank case 3 forming a crank chamber 2. As shown in FIG.

In the crank chamber 2, a crankshaft 6 and a rotating shaft T such as a camshaft 7 which is rotationally driven by the crankshaft 6 are vertically supported. They are connected by a connecting rod 9, and the camshaft 7 is connected to the intake and exhaust block 5.
The intake/exhaust valve 10 is configured to open and close.

As shown in FIGS. 2 and 3, a lubrication pump P for pumping lubricating oil is provided on the lower surface of the bottom wall 11 of the crankcase 3 at a location where the lower end of the camshaft 7 is pivotally supported.

This lubrication pump P is connected to the bottom wall 11 of the crankcase 3, which is a part that rotatably supports the lower end of the camshaft 7.
The bottom wall 1 of the crankcase 3 is recessed into the bottom wall 1 of the crankcase 3.
A pump chamber 12 is formed integrally with the pump chamber 12, a pump element 13 is attached to the pump chamber 12, and the lower end opening of the pump chamber 12 is covered with a bottom plate 14.
The pump element 13 has a transmission shaft 15 whose upper end is fitted into the lower end of the camshaft 7 as shown in FIG.
It is designed to be rotationally driven by a camshaft 7 via a camshaft 7.

A suction port 1 is provided on the upper surface of the pump chamber 12.
6 and a discharge port 17 are recessed, the suction port 16 is formed at a location extending from the upper surface of the pump chamber 12 to the circumferential surface near the chamber center position G in the cross-sectional plan view of the crank chamber 2, and the discharge port 17 is recessed. The suction port 16 is formed on the upper surface of the pump chamber 12 at a symmetrical position with respect to the transmission shaft 15.

The suction port 16 is provided with a suction hole 18 from its peripheral wall 16a.

This suction hole 18 is connected to the peripheral side wall 1 of the suction port 16.
A boss 20 is extended from 6a toward the center position G of the crank chamber shown in FIG. The end of 18 is boss 2
0 is opened at the vertical end surface 20a.

On the other hand, the discharge port 17 is communicated with the lower end of the camshaft 7, which has an oil supply path 21 formed therein, and the fitting portion of the transmission shaft 15 to the pump P through an oil feed hole 22.

The lubrication pump P configured as described above has a vertical end face 2 of the boss 20 by the operation of the pump element 13.
The lubricating oil in the crank chamber 2 is sucked in through the suction hole 18 opened at 0a, and the lubricating oil pressure-fed to the discharge port 17 is passed through the oil supply hole 22 to the oil supply path 21 in the camshaft 7.
The oil is supplied to the engine to lubricate each operating part of the engine.

In the above embodiment, the lubricating pump P is connected to the camshaft 7.
Although the camshaft 7 is formed at the lower end of the camshaft 7, the crankshaft 6 may also be used, or a separate rotating shaft T dedicated to driving the lubricating pump may be provided.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention,
Figure 1 is a cross-sectional plan view of the vertical engine, Figure 2
The figure is a sectional view taken along the line -- in Fig. 1, Fig. 3 is an enlarged sectional view taken in part shown in Fig. 2, Fig. 4 is a sectional view taken along the - line in Fig. 3, and Fig. 5 is a sectional view taken along the - line in Fig. 2. FIG. 6 is a top view of the pump chamber of the lubrication pump, and FIG. 7 is a view corresponding to FIG. 3 showing a conventional example. 1...Vertical engine, 2...Crank chamber, 3
...Crankcase, 11...Bottom wall of 3, 12...Pump chamber, 13...Pump element, 14...Bottom wall, 1
6... Suction port, 16a... Circumferential side wall of 16, 18...
Suction hole, 20...boss, 20a...tip surface of 20, T
...Rotating axis, G...Crank chamber center position.

Claims (1)

[Scope of utility model registration request] The rotating shaft T is vertically supported in the crank chamber 2 of the vertical engine 1, and the bottom 11 of the crankcase 3 is attached to the bottom surface of the bottom 11 of the crankcase 3 at the location where the lower end of the rotating shaft T is pivoted. A pump chamber 12 is integrally formed with a concave opening on the bottom surface, and a pump element 13 is assembled into this pump chamber 12 so as to be interlocked with the rotation axis T, and the bottom opening of the pump chamber 12 is covered with a bottom cover 14 for lubrication. In the vertical engine lubrication pump that forms the pump P, a suction port 16 is provided at a location extending from the upper surface of the pump chamber 12 to the circumferential surface on the side of the chamber center position G in the cross-sectional plan view of the crank chamber 2.
is recessed, and the boss 20 is extended from the peripheral side wall 16a of the suction port 16 toward the chamber center position G,
A suction hole 18 is formed in which the tip surface 20a of the boss 20 is substantially vertical, and extends from the circumferential side wall 16a of the suction port 16 through the interior of the boss 20 to the boss tip surface 20a.
A lubrication pump for a vertical engine, characterized in that the pump chamber 12 is provided at a position that can be formed by drilling from the lower opening of the pump chamber 12.