JPS6346648Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is an engine in which an oil slinger that is attached and supported by a part of a camshaft disposed orthogonally to the crankshaft is attached to one end of the crankcase in the axial direction of the camshaft. The present invention relates to an oil slinger assembly structure when the opening is larger than the formed opening for assembling the camshaft.

(Prior Art) In an engine including a camshaft disposed perpendicular to a crankshaft, it is conceivable to assemble and support an oil slinger on a part of the camshaft.

Conventionally, as an oil slinger assembly structure for this type of engine, in a four-stroke internal combustion engine with a vertically installed crankshaft and a valve mechanism, a camshaft is provided so as to intersect with the shaft of the crankshaft, and the camshaft is connected to the crankshaft. In addition to driving the camshaft, a governor slider of a speed regulating mechanism is provided at the end of the camshaft, and a part for scooping up oil is attached to the governor slider. ).

(Problem to be solved by the invention) For example, in the case of an engine with a cantilevered crankshaft, a relatively large opening for assembling the crankshaft is formed at one end of the crankshaft in the axial direction of the crankcase. In an engine having a valve mechanism, the camshaft is perpendicular to the crankshaft and engaged with the gears, and a relatively small opening for installing the camshaft is formed at one end of the crankcase in the axial direction of the camshaft. The same applies to engines with both crankshafts supported.

On the other hand, it is desirable for the oil slinger to have a large diameter in terms of its functionality, but in the conventional technology, when the oil slinger is mounted and supported on a part of the camshaft, the oil slinger is attached to the camshaft. If the opening is larger than the opening, the oil slinger cannot be inserted into the crankcase through the opening.

Therefore, insert a large-diameter oil slinger from the opening for assembling the crankshaft in the crankcase, and fit the tip of the camshaft inserted from the opening for assembling the camshaft into the mounting boss hole of the oil slinger. However, on the other hand, when placing such a large-diameter oil slinger on the rear end side of the camshaft, consideration is required, and the structure is simple and its assembly is difficult. It is desirable that this can be done easily.

This idea was created in view of the above circumstances.
The purpose of this is to simplify the structure of the camshaft, which is disposed perpendicular to the crankshaft, by installing an oil slinger that is larger than the opening for assembling the camshaft formed in the crankcase, making it easier to assemble the camshaft. To provide an engine oil slinger assembly structure that can be assembled.

(Means for Solving the Problems) In order to achieve the above object, the engine oil slinger assembly structure of the present invention includes a camshaft which is disposed orthogonally to the crankshaft and whose both ends are supported by bearings. an opening for assembling the crankshaft on one end of the crankshaft in the axial direction of the crankcase, an opening for assembling the camshaft on one end of the camshaft in the axial direction, and a diameter of the crankshaft assembling opening is smaller than the diameter of the camshaft assembling opening. The engine has an oil slinger with a large outer diameter mounted and supported on the rear end side with respect to the insertion direction of the camshaft, and the installation boss of the oil slinger has a substantially U-shape from the front. The oil slinger is fitted to the rear end shaft portion of the camshaft from a direction perpendicular to the camshaft axis via the U-shaped inner peripheral portion, and is connected to the camshaft with a pin, thereby assembling the oil slinger to the camshaft.

Moreover, it is preferable that the oil slinger is made of synthetic resin.

(Function) Even if the oil slinger has an outer diameter larger than the diameter of the opening for assembling the camshaft, the oil slinger can be easily assembled to the camshaft from a direction perpendicular to its axis.

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

FIG. 1 is a vertical side view of the engine, and FIG. 2 is a cross-sectional plan view thereof.

First, to explain the general configuration of the engine, the engine 10 is a vertically mounted crankshaft engine (vertical engine) in which a crankshaft 40 is vertically supported in a cantilevered manner at the bottom. The crank case 11, the cylinder block 22 and the cylinder head 23 constituting the cylinder 21 are integrally cast to form the case. A crankshaft assembly opening 12 is formed in the upper part of the crankcase 11 and is cut diagonally from the base of the cylinder 21.
is removably covered with a cover 31 made of a press-molded steel plate.

A piston 33 inserted from the opening 12 is slidably fitted into the cylinder 21, and the cylinder head 23 includes a spark plug 35 and two left and right intake/exhaust valves 36, 36 (in FIG. 1) is provided for this purpose. The stem 37 of the valve 36 is engaged with one end of each rocker arm 38, and the tip of a push rod 39 is connected to the other end of each rocker arm 38, and the push rod 39 is located below the cylinder 21 and is connected to the cylinder block 22 and It is inserted into a passage 24 formed in the lower part of the cylinder head 23, and a cover 32 made of a steel plate is attached to the cylinder head 23.

On the other hand, in the crankcase 11, a crankshaft 40 inserted through the opening 12 is rotatably supported by upper and lower bearings 13a and 13b in a cantilevered manner at the lower part of the crankcase 11. 45 and a crank pin 46.

Crank pin 4 of such a crankshaft 40
6 and the piston pin 34 of the piston 33 are connected by a connecting rod 51, and a holder plate 53 that also serves as a stopper for preventing the connecting rod 51 from coming off from the crank pin 46 is fixed to the upper end surface of the crank pin 46. A governor device 52 is mounted on the plate 53 so as to be coaxial with the crankshaft 40.

Furthermore, the upper and lower journals 42 of the shaft portion 41 of the crankshaft 40 are cantilevered at the lower part,
A gear 44 is formed on the shaft periphery between the upper and lower bearing parts 13a and 13b of the crankcase 11, and a recess 1 facing the gear 44 is formed on the cylinder 21 side between the upper and lower bearing parts 13a and 13b of the crankcase 11.
4 is horizontally formed, and a camshaft 60 is installed horizontally in this recess 14, and this camshaft 60
A gear 61 formed in the above-mentioned shape is orthogonally meshed with the gear 44. Cams 62, 62 are formed on both sides of the gear 61 of this camshaft 60, and each cam 62
A guide hole 26 connected to the proximal end of the push rod and formed in the proximal wall 25 of the passage 24 is provided.
The proximal end of the lifter 54 inserted therein can be brought into abutting engagement with the lifter 54 .

By the way, camshaft 6 of crankcase 11
A camshaft assembly opening 15 is formed at one end in the 0-axis direction, and the tip 63 of the camshaft 60 inserted through this opening 15 is inserted into the crankcase 1.
The rear end 64 of the camshaft 60 is supported by a bearing 56 in the center of a holder cap 55 which is detachably attached to the opening 15.

Further, the gear 44 of the crankshaft 40 has a second
As shown in the figure, a gear 71 is formed on an output shaft 70 disposed horizontally on substantially the same plane as the camshaft 60 and perpendicular to the camshaft 60.
are orthogonally meshed, and thus the driving force taken directly from the crankshaft 40 to the output shaft 70 is output to the axle of a lawn mower or the like on which the engine 10 is mounted. This output shaft 70 is integrated with the crankcase 11 and has front, rear and intermediate bearing portions 17a, 17b, 1
It is pivoted at 7c. Further, L in FIG. 1 is the standard oil level.

Note that the shaft lower end 41a of the crankshaft 40 projects and hangs below the crankcase 11 of the vertical engine 10 described above.In this embodiment, since the engine is used for a lawnmower, a holder 47 is attached to the shaft lower end 41a. blade 48
is installed.

In the present invention, the oil slinger 80, which has an outer diameter B larger than the diameter A of the camshaft assembling opening 15 and is advantageous in terms of oil scooping function, is inserted from the crankshaft assembling opening 12 to the rear end of the camshaft 60. It is assembled to the shaft part 65 near the part 64.

That is, as shown in FIG. 3 which is a front view and FIG. 4 which is a sectional view thereof, the mounting boss portion 81 of the oil slinger 80 has a substantially U-shape from the front, and the inner periphery 82 of this mounting boss portion 81 is half-shaped. It has a substantially U-shaped arc shape that is slightly larger than a circle, and the U-shaped both ends 83, 8 of the mounting boss portion 81 are located on the open end side of the inner periphery 82 of this arc shape.
3 are facing each other.

A total of four blades 86 for scraping up oil extend outward from the outer periphery 85 of the mounting boss 81, and in the illustration, the U-shaped both ends 83, One blade part 8 on the outer periphery of each part 83
6, 86, and one blade part 86, 86 is integrally provided on the outer periphery of the U-shaped part 84, diametrically opposed to these blade parts 86, 86, respectively.

Further, near the U-shaped both ends 83, 83 of the mounting boss portion 81, there are pin holes 8 that penetrate in the diametrical direction of the inner periphery 82.
7 and 87 are formed concentrically.

The oil slinger 80 configured in this way is
In the embodiment, it is made of an elastic body such as nylon.

The diameter of the curved inner periphery 82 of the U-shaped mounting boss portion 81 of the oil slinger 80 is approximately equal to the diameter c of the shaft portion 65 of the camshaft 60. Further, the blade portions 86 are formed at different positions in the axial direction from the mounting boss portion 81.

On the other hand, a shaft portion 65 near the rear end 64 of the camshaft 60 is formed to have a larger diameter than the rear end 64, and a pin hole 66 is formed through the shaft portion 65 in the diametrical direction.

Next, the procedure for assembling the oil slinger 80 to the camshaft 60 will be described.

First, the camshaft 60 is inserted through the camshaft installation opening 15 of the crankcase 11 and its tip 63 is supported by the bearing 16, and the oil slinger 80 is inserted through the crankshaft installation opening 12 of the crankcase 11. the U-shaped mounting boss 81 of the oil slinger 80 is fitted onto the shaft portion 65 near the rear end 64 of the camshaft 60 via its curved inner periphery 82, with its blade portion 86 facing toward the cam 62. match. At this time, since the oil slinger 80 is made of an elastic body in the embodiment, the U-shaped both end portions 83, 83 are elastically deformed in the expansion direction to facilitate the above-mentioned fitting, and the holding after fitting is performed by the U-shape. This is accomplished by returning the mold end portions 83, 83 toward each other.

Next, align the pin holes 87, 87 of the mounting boss portion 81 of the oil slinger 80 with the pin hole 66 of the shaft portion 65 of the camshaft 60, and insert the locking pin 91 inserted through the crankshaft assembly opening 12. These pin holes 87, 66, and 87 are inserted vertically.

Furthermore, a stopper plate 92 having a ring shape and a dish-like longitudinal section is inserted through the camshaft assembly opening 15, and this stopper plate 92 is loosely fitted to the rear end 64 of the camshaft 60, so that the shaft portion is assembled. 65 end face, and assemble the cylindrical portion 93 so as to cover and cap the outer circumference of the mounting boss portion 81. Then, the holder cap 55 is installed in the camshaft installation opening 15, and the bearing portion 56 is used to attach the holder cap 55 to the rear of the camshaft 60. The end portion 64 is pivotally supported.

By assembling the stopper plate 92 in this manner, the rotation stopper pin 91 is prevented from coming off and the oil slinger 80 is also prevented from steadying.

As described above, according to the present invention, even if the oil slinger 80 has an outer diameter B larger than the diameter A of the camshaft assembly opening 15, oil can be easily applied to the camshaft 60 from a direction perpendicular to its axis. The slinger 80 can be assembled, and the structure is simple and sufficient.

In the embodiment, the oil slinger 80 is made of an elastic material, but if it is made of metal, the camshaft 60
A narrow diameter portion 67 is formed in the direction of the cam 62 of the shaft portion 65, and the U-shaped mounting boss portion 81 of the oil slinger 80 is once hooked onto the narrow diameter portion 67, and the oil slinger 80 is moved to a predetermined shaft portion 65. All you have to do is fit it in. Also, the crankshaft may be of a double-sided type,
Furthermore, the present invention is of course applicable not only to vertical engines but also to horizontally mounted crankshaft engines.

(Effects of the invention) As is clear from the above explanation, according to the invention,
An oil slinger having an outer diameter larger than the diameter of an opening for assembling the camshaft formed in the crankcase can be simply and easily assembled to the camshaft disposed orthogonally to the crankshaft.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical sectional side view of the engine, and FIG.
2-line sectional view, Figure 3 is a front view of the oil slinger,
FIG. 4 is a sectional view taken along the line 4--4 in FIG. In the drawing, 10 is the engine, 11 is the crankcase, 12 is the opening for assembling the crankshaft, and 15
is an opening for assembling the camshaft, 40 is the crankshaft, 60 is the camshaft, 80 is the oil slinger, 81 is its mounting boss, 82 is the U-shaped inner periphery, 91 is a rotation stopper pin, 92 is a stopper plate, A is the diameter of the camshaft assembly opening, B is the outer diameter of the oil slinger, C is the diameter of the shaft, and L is the standard oil level.

Claims (1)

[Claims for Utility Model Registration] (1) A camshaft which is disposed orthogonally to the crankshaft and whose both ends are supported by bearings, and which is used for incorporating the crankshaft into one end of the crankshaft in the axial direction of the crankcase. An oil slinger having an opening for installing the camshaft on one end side in the axial direction of the camshaft and having an outer diameter larger than the diameter of the opening for installing the camshaft is attached to the rear end of the camshaft with reference to the insertion direction of the camshaft. In the engine, the oil slinger is mounted and supported on the side, and the mounting boss portion of the oil slinger is approximately U-shaped from the front, and the mounting boss portion is attached to the shaft portion near the rear end of the camshaft from a direction perpendicular to the camshaft axis. Fits through the U-shaped inner circumference,
An engine oil slinger assembly structure characterized by pin connection to the camshaft. (2) The engine oil slinger assembly structure according to claim 1, wherein the oil slinger is made of synthetic resin.