JPS6318743Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a vertical crankshaft type engine in which the crankshaft is vertically cantilevered at the bottom. This invention relates to a vertically mounted crankshaft engine which aims to reduce the amount of oil and at the same time improve oil lubrication by efficiently dripping oil above the crank web.

(Prior Art) In a vertical crankshaft type engine in which the crankshaft is vertically supported in a cantilevered manner at the bottom, a breather is generally attached to the upper wall of the crankcase.

In order to reduce the amount of oil leaking from the breather, it is first important to reduce the amount of oil in the atmosphere around the breather. Or, the breather passage was configured as a maze.

(Problems to be Solved by the Invention) However, in the case of a vertically mounted crankshaft engine as described above, oil droplets may adhere to the baffle plate or remain within the maze, making it difficult to utilize the oil effectively. In addition, the crankcase and the baffle plate had to be integrally molded, making the molding process complicated.

The present invention was devised to solve these conventional problems, and its purpose is to remove oil from the breather in a vertically mounted crankshaft engine in which the crankshaft is supported vertically at the bottom in a cantilevered manner. To provide a vertically mounted crankshaft engine which prevents oil leakage as much as possible, improves oil lubrication by efficiently dripping oil above the crank web, and facilitates molding of the crankcase. be.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a vertical crankshaft type in which the crankshaft is vertically disposed within the crankcase, and the lower part of the crankshaft is supported in a cantilever manner within the crankcase. In the engine, an opening is formed in the crankcase above the crankshaft, a breather is attached to a cover member that closes the opening, and the cover member bulges downward to cover the breather and is removed from the crankcase. The gist is that a plate is provided to prevent mist-like oil from leaking into the breather, and the most bulging part of the plate is located above the crank web of the crankshaft.

(Function) According to such a vertically installed crankshaft engine, since the plate is provided on the lower surface side of the cover member and is disposed horizontally so as to bulge downward and cover the breather, mist-like oil in the crankcase is disposed on the breather. The plate acts as an effective baffle plate to prevent oil from leaking when air is removed from the breather, and the amount of oil leaking from the breather can be significantly reduced.

In addition, since the oil guide is constructed by positioning the most downwardly bulging portion of the plate above the crank web, oil droplets adhering to the lower surface of the plate are guided toward the most bulging portion. The dripped oil drips onto the crank web from the most bulging part, and as the crank web rotates, the dripped oil becomes a mist and spreads, making it possible to efficiently lubricate the inside of the engine again. Since it also serves as a guide, the number of parts does not increase.

Furthermore, since the plate is provided on the lower surface side of the cover member, there is no need to integrally mold the crankcase and the baffle plate, making it easier to mold the crankcase.

(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a longitudinal side view of the engine, and FIG. 2 is a longitudinal front view of the engine, showing the cut portions of the left and right halves with different phases in the front and rear.

As shown in the drawings, the engine 10 is a vertical crankshaft type engine (vertical engine) in which a crankshaft 30 is supported vertically and cantilevered at the bottom, and the cylinder 16 is oriented horizontally and the crankcase 11 is oriented vertically. The crank case 11, the cylinder block 17 and the cylinder head 18 constituting the cylinder 16 are integrally cast to form the case. An opening 12 is formed in the upper part of the crankcase 11 and cut diagonally from the base of the cylinder 16, and this opening 12 is removably covered with a crankcase cover 21 made of a press-formed steel plate.
The upper plate 21a of the crankcase cover 21 is formed to bulge upward, and therefore the cover upper plate 21a constitutes the upper wall of the crankcase 11.

A piston 23 is slidably fitted into the cylinder 16, a spark plug 25 is fitted into the cylinder head 18 obliquely from the front upper side, and two left and right intake/exhaust valves 26, 26 are fitted in the center of the cylinder head 18. (In Fig. 1, there is one for the longitudinal side). The valve stem 27 of the valve 26 is engaged with one end of each rocker arm 28, and the tip of a push rod 29 is engaged with the other end of each rocker arm 28, respectively.
This push rod 29 is located below the cylinder 16 and is connected to a push rod passage 19 formed at the bottom of the cylinder block 17 and the cylinder head 18.
A cover 22 made of a steel plate is attached from the front of the cylinder head 18.

On the other hand, a crankshaft 30 is vertically supported from above on the crankcase 11 by a shaft part 31 constituting the lower part of the crankcase 11, and is rotatably supported by upper and lower bearing parts 13, 14 at the lower part of the crankshaft 30. It is constructed in a cantilevered manner consisting of a shaft portion 31, a crank web 35, and a crank pin 36.

Crank pin 3 of such a crankshaft 30
6 and the piston pin 24 of the piston 23 are connected by a conrod 41, and a stopper plate 37 is attached to the upper end surface of the crank pin 36 by a bolt 38 and a concave/convex engagement 39. is prevented from coming off from the crank pin 36. Further, the stopper plate 37 is formed integrally with a holder plate 47 of a governor device 46 that controls the throttle of the carburetor. The device 46 is mounted coaxially with the crankshaft 30.

Furthermore, the upper and lower journals 32 of the shaft portion 31 of the crankshaft 30 are cantilevered at the lower part,
A gear 34 is formed on the axial circumference between the upper and lower bearing parts 13 and 14 of the crankcase 11, and a recess 15 facing the gear 34 is horizontally formed on the cylinder 16 side between the upper and lower bearing parts 13 and 14 of the crankcase 11. camshaft 50
A gear 51 formed on the camshaft 50 is orthogonally meshed with the gear 34. Cams 52, 52 are formed on both sides of the gear 51 of the camshaft 50, and each cam 52 is connected to the base end of the push rod 29.
The base end of the lifter 53 inserted into the guide hole 19b formed in the base end wall 19a of the passage 19 abuts and engages.

An oil slinger 54 is attached to one end of the camshaft 50, and as the oil slinger 54, which is integrated with the camshaft 50, rotates, oil accumulated at the bottom of the crankcase 11 is transferred to the crank web 35.
The engine 10 is scraped up toward the engine 10 to lubricate the inside of the engine 10 with mist-like oil.

Further, the gear 34 of the crankshaft 30 has a second
As shown in the figure, a gear 56 is formed on an output shaft 55 that is disposed horizontally on substantially the same plane as the camshaft 50 and perpendicular to the camshaft 50.
are in orthogonal meshing, and the driving force taken directly from the crankshaft 30 to the output shaft 55 is output via the clutch mechanism to the axle of a working machine such as a lawn mower on which the engine 10 is mounted.

Furthermore, a breather hole 61 is opened approximately in the center of the upper plate 21a of the crankcase cover 21 that constitutes the upper wall of the crankcase 11, and a disc-shaped self-weighting breather valve 62 is provided on the upper surface of the breather hole 61. The upper limit of movement of the breather valve 62 is set by the upper wall of a horizontally installed breather passage 63, and a breather pipe 64 is erected from one side of this breather passage 63. . In this way, the upper plate 21a of the crack case cover 21
A breather 60 having a valve 62 is attached thereto, and when the valve 62 moves upward, the breather hole 61, the lower part of the breather passage 63, and the breather pipe 64 communicate with each other, and the piston passes through a tube 65 connected to the breather pipe 64. Air in the engine 10 is vented during the backward movement of the engine 23.

A cap 66 is attached to the breather 60 from above.

Vertical engine 1 configured as described above
A lower end 31a of a shaft portion 31 of a crankshaft 30 projects and hangs below the crankcase 11 of the crankshaft 30. In this embodiment, since the engine is used for a lawnmower, a holder 4 is attached to the lower end 31a of the shaft.
A blade 43 is attached via 2.

In the present invention, the upper plate 21 of the crankcase cover 21 that constitutes the upper wall of the crankcase 11 is
The upper plate 21a and the crank web 3 are placed on the lower surface side of a.
A plate 70 bulging downward was horizontally installed using the space formed between the plate 5 and the plate 70.

That is, the crankcase cover 21 is attached to the crankcase cover 21 almost entirely around the peripheral edge 71 of the plate 70, which bulges downward in an inverted mountain shape, except for a part, for example, one side or both sides.
A breather chamber 69 having a certain degree of airtightness is formed between the plate 70 and the upper plate 21a of the crankcase cover 21.

Furthermore, the most downwardly bulging portion 72 of the plate 70 is made to approximately coincide with the axis of the crankshaft 30, a guide port 73 is formed at the lower end of the most bulging portion 72, and the governor device is inserted into the guide port 73. 46 sliders 48 are exposed.

The tip of the slider 48 moves upward and connects the link mechanism 4.
Push up one end of 9, thereby link mechanism 49
The throttle control of the carburetor is performed by interlocking the two.

Therefore, the upper plate 21a of the crankcase cover 21
An inverted mountain-shaped plate 7 that bulges downward on the bottom side of the
Since the breather chamber 69 is formed by horizontally disposing the breather chamber 69, the plate 70 can act as an effective baffle plate and prevent the mist-like oil in the crankcase 11 from leaking when air is removed from the breather 60. The amount of oil leaking from the breather 60 can be significantly reduced.

Furthermore, at the same time, the downwardly most protruding portion 72 of the inverted mountain-shaped plate 70 is configured to face above the crank web 35 (in the embodiment, moreover, it substantially coincides with the axis of the crankshaft 30). The oil adhering to the lower surface of the inclined peripheral wall 74 surrounding and continuous with the most bulging part 72 of the plate 70 flows along the most bulging part 72, and in the embodiment, drips onto the governor device 46 and further onto the crankshaft. The oil is dripped onto the web 35 and turned into a mist by the governor device 46 and crank web 35 which rotate at high speed, and the interior of the engine 10 can be efficiently lubricated again.

Therefore, the plate 70 serves as a baffle plate for the breather 60, and at the same time, its lower surface also serves as an oil guide, so that it is possible to prevent oil from leaking from the breather 60 as much as possible, and to efficiently drain the oil. Improved oil lubrication can be achieved by dripping.

(Effects of the invention) As is clear from the above explanation, according to the invention,
In a vertically mounted crankshaft engine, a plate is provided that bulges downward on the bottom side of the cover member, and the most bulging part faces above the crank web, so that the plate has two functions as a baffle plate and an oil guide. Without increasing the number of parts, it is possible to significantly reduce the amount of oil leaking from the breather and at the same time improve oil lubrication efficiency through the oil guide action. Furthermore, the crankcase can be easily molded, improving productivity, and since the plate can be attached and detached at the same time as the cover member, maintenance efficiency can also be improved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal side view of the engine, and FIG. 2 is a longitudinal sectional front view thereof. In the drawings, 10 is the engine, 11 is the crankcase, 21a is the upper wall thereof, 30 is the crankshaft, 35 is the web, 60 is the breather, 70 is the plate, and 72 is the most protruding part thereof.

Claims (1)

[Scope of Claim for Utility Model Registration] In a vertical crankshaft type engine in which the crankshaft is arranged vertically within the crankcase and the lower part of the crankshaft is cantilevered within the crankcase, A breather is attached to a cover member that forms an opening and closes the opening, and bulges downward on the lower surface of the cover member to cover the breather and prevent mist oil from leaking from the crankcase to the breather. 1. A vertically mounted crankshaft engine, characterized in that a plate is provided, and the most protruding portion of the plate is located above the crank web of the crankshaft.