JPH089367Y2 - Engine crankcase blazer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a crankcase blazer device for a vertical axis engine.

[Premise structure]

The engine crankcase blazer device of the present invention is, for example, as shown in FIG. 1, FIG. 5 or FIG. 7, FIG.
It is intended for those who have the following prerequisite structure and advantages.

○ Premise structure The upper end (3a) of the crankshaft (3) is projected onto the upper wall (2a) of the crankcase (2) of the vertical axis engine (1), and the upper wall (2a) of the crankcase (2) is projected. Fix the flywheel (5) to the upper end (3a) of the crankshaft (3) with the crankcase (2) upper wall (2a) than the peripheral wall portion (5a) of the flywheel (5). A blazer chamber (13) is formed near the center of the upper wall near the shaft (3), an inlet hole (17) is provided at the beginning of the length of the blazer chamber (13), and a gas outlet hole (18) is provided at the end thereof. Is opened, and the inlet hole (17) is communicated with the crank chamber (16).

○ Advantages (a) Since the breather chamber (13) is located above the crank chamber (16), the oil mist in the crank chamber (16) is less likely to be mixed into the blow-by gas and brought into the breather chamber (13). It is advantageous for oil separation.

(B) The inlet hole (17) of the breather chamber (13) is located sufficiently higher than the oil level in the oil pan below the crank chamber (16), and is close to the horizontal center of the crank chamber (16). Since it is located, the oil outflow preventing engine allowable tilt angle for preventing the oil in the oil pan from flowing out to the blazer chamber (13) can be increased.

(C) The flywheel (5) is not limited by the peripheral wall of the blazer chamber (13) and can be positioned low,
The overall height of the vertical axis engine (1) can be lowered.

[Conventional technology]

In the above-mentioned premise structure, as a structure for separating and removing the mist oil that has entered the breather chamber (13) from the blow-by gas, the structure shown in FIGS. 7 and 8 in the prior art (Japanese Utility Model Publication No. 61-29007). ). It looks like this:

The gas outlet hole (18) is led out in a direction in which the gas outlet hole (18) is slightly inclined with respect to the end side portion of the gas flow passage in the breather chamber (13).

An oil return hole (19) opens directly on the bottom surface (34) of the blazer chamber (13).

[Problems to be solved by the device]

 The above conventional technique has the following problems.

○ Low oil separation performance in the breather chamber (13) First, blow-by gas floats in the blow-by gas because it passes from the beginning to the end of the gas flow path in the breather chamber (13). The flowing mist oil is difficult to separate during the flow.

Secondly, the blow-by gas smoothly flows out from the end portion of the gas flow passage in the breather chamber (13) to the gas outlet hole (18), so that the mist oil is not easily separated.

Thirdly, since the separated oil is widely dispersed on the entire bottom surface (34) of the blazer chamber, it is entrained in the flow of blow-by gas from this wide surface and re-misted in a large amount.

Due to these three actions, the oil separation performance in the blazer chamber (13) is low.

An object of the present invention is to improve the oil separation performance in the breather chamber.

[Means for solving the problem]

The present invention is characterized in that, in the above-described premise structure, in order to achieve the above object, for example, as shown in FIG. 1 to FIG.

A valve unit (22) is installed transversely in the middle of the gas flow path in the blazer chamber (13).
3) The gas outlet hole (18) is led out in a direction in which it is folded back with respect to the end side portion of the gas flow passage in the inside, and from the valve unit (22) to the gas outlet hole (18), An oil collecting recess (35) deeper than this is formed in the bottom surface (34) of the blazer chamber (13), and an oil return hole (31) is opened in this oil collecting recess (35).

[Action]

First, when the blow-by gas is rapidly accelerated immediately after passing through it by the valve unit (22) while flowing from the start end to the end end of the gas flow path in the breather chamber (13), The mist oil floating inside is heavy, so it is left behind and falls off and is separated.

Secondly, when the blow-by gas folds back at the end of the breather chamber (13) and goes out to the gas outlet hole (18), the mist oil floating in the blow-by gas goes straight by inertia, and the blower chamber ( It adheres to the end wall of 13) and is separated.

Thirdly, the oil separated by the above-mentioned first and second actions is the oil collecting recess (35) from the bottom surface (34) of the blazer chamber.
The size of the oil surface flowing into the oil collecting recess (35)
The narrower the space, the smaller the amount of re-mist that is involved in the flow of blow-by gas.

〔effect〕

Since the present invention is configured and operates as described above, it has the following effects.

(A) High oil separation performance in the breather chamber First, mist oil is separated when blow-by gas is rapidly accelerated by the valve unit (22).

Secondly, the mist oil is separated when the blow-by gas is turned back at the end of the breather chamber (13) and flows out to the gas outlet hole (18).

And third, the separated oil is
Collected in 5), the oil surface becomes narrower,
The amount of re-mist that is caught in blow-by gas is reduced.

By the combination of these three functions, the oil separation performance in the breather chamber is significantly improved.

〔Example〕

FIG. 5 shows a longitudinal side surface of a vertical axis engine 1 equipped with a crank chamber blazer device 1 according to the present invention, and FIG. 6 shows a walk type management machine as an example of an agricultural machine equipped with the engine 1. .

The crankcase 2 of the vertical-axis engine 1 has a split structure of two upper and lower parts, and a crankshaft 3 is penetratingly supported across an upper wall 2a and a bottom wall 2b thereof.

A drum-shaped flywheel 5 integrally formed with a cooling fan 4 and a recoil starter 6 are connected to an upper end portion 3a of the crankshaft 3, and the cooling air generated by the cooling fan 4 is passed through a wind guide housing 7 to a crankcase 2 It is configured to lead to the rear cylinder portion 8.

When the vertical axis engine 1 is installed in the management machine shown in FIG. 6, the transmission case 9 is directly connected to the lower portion of the crankcase 2, and the lower end portion 3b of the crankshaft 3 is connected to the transmission case 9.
In order to drive the work rotor 11 or the wheels mounted on the rotary shaft 10, the power is transmitted to the rotary shaft 10 supported horizontally at the lower end of the transmission case 9 by interlockingly connecting with a speed reducer (not shown) in the inside. Composed.

The vertical axis engine 1 having the above-described structure is provided with the crank chamber blazer device according to the present invention, and the structure thereof will be described in detail below with reference to FIGS. 1 to 5.

At an area near the center of the upper wall 2a of the crankcase 2, a substantially arc-shaped blazer chamber 13 along the bearing boss 12 of the crankshaft 3 is formed.
Are provided so as to be located inside the peripheral wall portion 5a of the flywheel 5.

The blazer chamber 13 is configured by bolting a lid cover 15 to the upper end of a blazer chamber peripheral wall 14 that is erected on the crankcase upper wall 2a, and has an inlet hole communicating with the crank chamber 16 at one end thereof. 17 is formed and the peripheral wall 14 on the other end side is formed.
Gas outlet hole that is connected to the air cleaner (not shown)
An opening 18 is formed in the blazer chamber 13 so as to be led out in a folding direction with respect to the end side portion of the gas flow passage.

The inlet hole 17 is provided with a disc-shaped valve 21 which is closed and biased by a spring 20 so that the valve 21 is opened and closed according to an increase or decrease in the internal pressure of the crank chamber 16.

Further, a reed-type valve unit 22 is incorporated in the middle of the blazer chamber 13 in the longitudinal direction, and the blazer chamber 13 is divided into front and rear in a diagonally transverse shape. This valve unit 22 has a through hole 23.
Before and after the partition plate 24 having the baffle plate 25, the reed valve 26,
Further, the reed valve stopper 27 is arranged and connected by the rivet 28, and the seal rubber 29 is fitted around the entire circumference of the partition plate 24. The peripheral shield rubber 29 of the partition plate 24 is fitted into and supported by the guide wall 30 formed on the peripheral wall 14 and the bottom surface of the blazer chamber, and the valve unit 22 is assembled in the blazer chamber 13 in a sealed state by pressing it with the lid cover 15. It is designed to be attached and fixed. A small oil return hole 31 is provided in the lower portion of the partition plate 24.

Between the valve unit 22 and the gas outlet hole 18, a bottom surface 34 of the blazer chamber 13 is formed with an oil collecting recess 35 that is deeper than the bottom. The upper end of the oil return hole 19 opens at the bottom of the oil collecting recess 35, and the lower end of the hole communicates with the crank chamber 16. The oil return hole 19 is filled with steel wool 32.

[Brief description of drawings]

1 is a plan view showing an upper surface of a crankcase of a vertical axis engine to which the present invention is applied, FIG. 2 is a vertical sectional side view of a blazer device, FIG. 3 is a sectional view taken along line III-III in FIG. 1, and FIG. Is an exploded perspective view of the reed valve unit, FIG. 5 is a vertical sectional side view of the vertical axis engine, and FIG. 6 is an overall side view of a walk-behind management machine equipped with the vertical axis engine. FIG. 7 is a plan view of a crankcase of a vertical axis engine showing a conventional technique, and FIG. 8 is a sectional view taken along line XIII-XIII in FIG. 1 ... vertical axis engine, 2 ... crankcase, 2a ... upper wall, 3 ... crankshaft, 3a ... upper end, 5 ... flywheel, 5a ... peripheral wall, 13 ... blazer chamber, 16 …… Crank chamber, 17 …… Inlet hole, 18 …… Gas outlet hole, 19 …… Oil return hole, 22 …… Valve unit, 34 …… Blazer chamber bottom, 35…
… Oil collecting recess.

Front page continued (72) Inventor Nakasuke Itsuke 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Iron Works Co., Ltd. Sakai Works (56) Reference JP-A 63-285212 (JP, A) JP, U)

Claims (1)

[Scope of utility model registration request] 1. An upper end portion (3) of a crankshaft (3) on an upper wall (2a) of a crankcase (2) of a vertical axis engine (1).
a) is projected, and the flywheel (5) is fixed to the upper end (3a) of the crankshaft (3) on the upper wall (2a) of the crankcase (2), and the upper wall (2a) of the crankcase (2) is fixed. ), The blazer chamber (13) is formed in the central portion of the upper wall that is closer to the crankshaft (3) than the peripheral wall portion (5a) of the flywheel (5), and the start end of the blazer chamber (13) in the longitudinal direction is formed. In the crank chamber blazer device for an engine, an inlet hole (17) is opened in the end portion, a gas outlet hole (18) is opened in the end portion, and the inlet hole (17) is communicated with the crank chamber (16). A valve unit (22) is provided transversely in the middle of the gas flow passage in the chamber (13), and the blazer chamber (13)
The gas outlet hole (18) is led out in a direction in which the gas outlet hole (18) is folded back toward the end portion of the gas flow passage in the interior of the breather chamber from the valve unit (22) to the gas outlet hole (18). An engine characterized in that an oil collecting recess (35) deeper than this is formed in the bottom surface (34) of (13) and an oil return hole (19) is opened in this oil collecting recess (35). Crankcase blazer device.