JP3649512B2 - General-purpose engine lubricator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lubrication device for a general-purpose engine used in combination with various working machines.
[0002]
[Prior art]
For example, general-purpose engines used in combination with various work machines, such as those installed in lawn mowers, generally put lubricating oil in the crankcase and squeeze this lubricating oil at the large end of the connecting rod to slide in the crankcase. A splashing lubrication system is used to lubricate the parts, and for this reason, an oiling device for injecting lubricating oil is provided in the crankcase.
[0003]
A conventional lubricating oil supply device for a general-purpose engine will be described with reference to FIGS.
A first conventional example will be described with reference to FIGS. FIG. 5 is a front view of an oiling device for a vertical axis engine equipped with a long oil pipe of the first conventional example, FIG. 6 is a side view corresponding to FIG. 5, and FIG. FIG.
[0004]
In the figure, reference numeral 1 denotes a crankcase integrated with a cylinder. Reference numeral 2 denotes a conventional crankcase cover which is attached under the crankcase 1 and contains lubricating oil 5. An oil pipe 3 is fixed to a lubricating oil conduction hole 2 a opened to the side of the crankcase cover 2 with a bolt 10 with a packing 11 interposed therebetween. The oil pipe 3 extends from the fixing portion with the crankcase cover 2 to the top surface of the fuel tank 4 after being bent about 90 ° to facilitate the oiling work, and extends to the upper surface of the fuel tank 4. 6 is fitted.
[0005]
A second conventional example will be described with reference to FIGS. FIG. 8 is a front view of an oiling device for a vertical engine equipped with a short oil pipe 21 of the second conventional example, and FIG. 9 is a lower sectional view of the short oil pipe in FIG. In FIG. 8, 20 is a small fuel tank. An oil cap 22 provided with an oil gauge 24 is fitted by shortening the fixing portion of the oil pipe 21 to the crankcase cover 2 and sandwiching the packing 23 in FIG.
[0006]
In the lubrication device for the vertical axis engine configured as in the first and second conventional examples, the oil cap (6, 22) is removed after the oil cap (6, 22) is injected when lubricating oil is injected. The lubricating oil does not enter the crankcase 1 above the liquid level that closes the side opening 2 a of the crankcase cover 2. In the first conventional example and the second conventional example, it is necessary to make the oil pipes 21 and 3 separately according to the size of the fuel tank, and there is a waste in manufacturing.
In order to eliminate this drawback, FIGS. 10 to 11 show an oil pipe divided.
[0007]
A third conventional example will be described with reference to FIG. FIG. 10 is a cross-sectional view of an essential part of a split type short oil pipe of a third conventional example corresponding to FIGS. 8 to 9 of the second conventional example. The third conventional example is applied to the case where the fuel tank is small like the second conventional example, and 30 is a bent portion fixed to the crankcase cover 2 with two bolts or the like. An oil cap 32 provided with a screw 30a at a bent portion 30 of the oil pipe, sandwiching a packing 34, and provided with an oil gauge 33a is directly attached with a screw.
[0008]
A fourth conventional example will be described with reference to FIG. FIG. 11 is a cross-sectional view of a main part of an oil pipe of a fourth conventional example corresponding to FIGS. 5 to 7 of the first conventional example. In the fourth conventional example, an oil pipe extension 31 and an oil gauge 33b are inserted into a part of the third conventional example. The fourth conventional example is similar to the first conventional example in that the fuel tank is large, 31 is an oil pipe extension, the lower end sandwiches the packing 34, and is screwed into the screw 30a of the bent portion 30 to the upper end. The same screw 31a as the screw 30a is provided, and an oil cap 32 having an oil gauge 33b is screwed into the screw 30a with a packing 34 interposed therebetween.
[0009]
[Problems to be solved by the invention]
In general-purpose engines used in combination with various working machines, it is inevitable that specifications for providing an oiling port of an oiling device on the upper surface of the tank are required due to the working machine. In this case, in the above-described conventional example, the oil pipe and the crankcase are joined by providing a flange portion having a relatively large contact area at the end of the oil pipe and screwing with two bolts through a packing, Further, the pipe bending portion and the extension portion are coupled by screws through the packing, and there is a disadvantage that the mounting operation is complicated.
[0010]
SUMMARY OF THE INVENTION An object of the present invention is to provide an oiling device for a general-purpose engine that eliminates the above-mentioned drawbacks and is easy to install and low cost.
[0011]
[Means for Solving the Problems]
Lubrication apparatus according to claim 1, wherein the general-purpose engine, an opening is provided above the crankcase cover, the lubrication system of the general-purpose engine mounted oil pipe for injecting the lubricating oil into the opening,
The opening 52a is formed with an O-ring seal portion 52c having a diameter larger than that of the fitting hole on the inner periphery on the fitting hole 52b to be fitted with the oil pipe 54.
On the other hand, on the oil pipe 54 side, a bolt hole 54g is provided in a flange part 54a located at the upper part of the O-ring mounting part, and a female screw 52d is provided in the side of the opening part facing the bolt hole.
The lower part of the oil pipe is fitted and supported by an opening of the crankcase cover and a boss 52e provided at a position spaced from the opening, and the outer periphery of the insertion part and the inner periphery of the oil pipe are O-ring 57. And a bolt 59 in which an oil pipe is inserted from the bolt hole is screwed onto the female screw, and the oil pipe is firmly held at two locations.
[0012]
The general-purpose engine lubrication device according to claim 2 is the general-purpose engine lubrication device according to claim 1, wherein the fitting of the lower end of the oil pipe 54 and the boss 52e is a taper fitting, and the lower portion of the oil pipe is held. It is characterized by certainty.
[0013]
A new opening is provided in the upper part of the crankcase cover, and the cylindrical part below the oil pipe is inserted through this opening, and is supported at two locations of the opening and the support boss provided at a distance of 1 from the opening. Then, the oil pipe is fixed with one bolt through the flange portion. The oil pipe is integrally formed of resin or the like, and the upper side of the flange portion is formed as a conical cylinder that slightly opens upward, and an oil cap provided with an oil gauge is put on and screwed to the inlet at the upper end. The opening of the crankcase cover is sealed by pressing the inner peripheral surface of the opening with an O-ring externally fitted to the oil pipe.
[0014]
[Action]
The oil pipe is inserted through the opening provided in the crankcase cover and is supported at two locations, the opening and the support boss, so it has a sufficient resistance moment, and even if an unexpected bending moment is applied from the outside, the flange portion In addition, since the sealing between the opening and the opening is performed by the pressing force in the radial direction of the O-ring, the pressing force in the axial direction for sealing is not required. If fixed, the oil pipe can be held sufficiently stably, and the installation work of the oil pipe is extremely simple.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of an oiling device for a general-purpose engine according to the present invention will be described with reference to FIGS.
FIG. 1 is a side view of an air-cooled four-cycle inclined horizontal shaft engine equipped with an oiling device according to a first embodiment of the present invention as viewed from the output shaft side, FIG. 2 is a plan view of FIG. FIG. 4 is a side view of the oil pipe and the oil cap of the first embodiment, and FIG. 4 is a perspective view of the vicinity of the opening of the crankcase cover of the first embodiment.
51 is a crankcase (cylinder block), 52 is a crankcase cover bolted to the crankcase 51, 52a is an opening for an oil pipe provided at the upper part of the crankcase cover 52, 53 is an output shaft, and 54 is ( Extension) oil pipe, 55 is an oil cap, 59 is an oil pipe mounting (with seat) bolt, and 60 is a fuel tank. A recess 60a is formed in the fuel tank 60, and an upper portion of the oil pipe 54 is accommodated in a state in which a part thereof is fitted in the recess 60a.
FIG. 3 is a side view of an oil pipe and an oil cap. 54 is the oil pipe, 55 is an oil cap, 56 is an oil gauge, and 57 and 58 are O-rings.
[0016]
The oil pipe 54 is a pipe integrally formed of resin or the like, and a trumpet-shaped conical cylinder portion 54b that opens upward from the mounting flange portion 54a provided below the center in the vertical direction, and the lower side The cylindrical portion 54c is a parallel cylindrical portion. The upper end of the conical cylindrical portion 54b has a groove for attaching an external thread 54d and an O-ring 58, the lower end of the cylindrical portion 54c has a tapered portion 54e, and the lower portion of the flange portion 54a. A seal portion 54f having a diameter slightly larger than that of the cylindrical portion 54c and a mounting groove for the O-ring 57 are formed, and a bolt hole 54g is provided in the flange portion 54a.
[0017]
The oil cap 55 is also integrally formed of resin or the like, and has an internal thread 55a and a seal portion 55b that are threadedly engaged with the male screw 54d on the inner peripheral portion, and the oil gauge 56 is made of steel and has one end embedded in the oil cap 55 and integrated. The other end is in the oil. FIG. 4 is a perspective view of the vicinity of the opening of the crankcase cover according to the first embodiment, and is a perspective view of the vicinity of the opening 52a provided at the top of the crankcase cover 52 as viewed from the crankcase 51 side (the back side in FIG. 1). Thus, the opening 52a includes a fitting hole 52b that fits into the cylindrical portion 54c of the oil pipe 54, and a seal portion 52c that has a slightly larger diameter than the fitting hole 52b.
[0018]
A female screw 52d is provided on the side of the opening 52a, and chamfering is performed on the upper portion of the seal portion 52c so that the O-ring 57 can easily enter. 52e is a position separated from the opening 52a by an appropriate distance (for example, about 1 = 70 mm from the upper surface of the opening 52a and the length from the lower surface of the flange portion 54a of the oil pipe 54 to the tip of the cylindrical portion 54c). The boss is formed integrally with the crankcase cover 52 and has an open tapered hole that fits into the tapered portion 54 e of the oil pipe 54. 4 shows a case where the tip end of the tapered hole is opened because the protruding height of the boss 52e is reduced, the tapered portion 54e at the tip end of the oil pipe 54 can be sufficiently held and fixed. .
[0019]
Note that 51a (two places) in FIG. 1 are lubricating oil conduction holes formed integrally with the crankcase 51, and are provided to use the cylinder block 51 in common with other specifications. The same cap 32 is closed.
[0020]
The operation of the lubricating device of the first embodiment having the above-described configuration will be described.
The oil pipe 54 is inserted into the crankcase cover 52 through the opening 52a, and is fixed by a seated bolt 59 that is screwed into the female screw 52d through the bolt hole 54g of the flange portion 54a. The upper portion of the cylindrical portion 54c is supported by being fitted into the fitting hole 52b of the opening 52a and the tapered portion 54e at the lower end is fitted into the tapered hole of the boss 52e, and the O-ring 57 and the sealing portion that are externally fitted to the sealing portion 54f. Sealing with 52c is performed.
[0021]
The pressing force of the O-ring 57 acts in the radial direction, does not require a longitudinal tightening force by the bolt 59, and supports the oil pipe 54 at an appropriate distance in the vertical direction. Even if it receives, it can have a sufficient resistance moment, and can easily perform stable attachment with one bolt 59.
The cap 55 is attached and detached with a screw as in the conventional example, but the sealing between the cap 55 and the seal portion 55 a is performed by the pressing force in the radial direction of the O-ring 58.
[0022]
【The invention's effect】
The lower part of the oil pipe is inserted into the crankcase cover and supported at two places, the opening of the crankcase cover and the boss provided in the crankcase cover, and the opening is sealed with a pressing force in the radial direction of the O-ring. Therefore, the oil pipe can have a sufficient resistance moment against the bending moment from the outside, and does not require a longitudinal tightening force for sealing, so it can be easily and stabilized by a single bolt. Installation can be performed. The lower part of the oil pipe can be securely held by fitting into the tapered hole.
[Brief description of the drawings]
FIG. 1 is a front view of a horizontal shaft type engine according to a first embodiment equipped with a fueling device of the present invention.
FIG. 2 is a plan view corresponding to FIG.
FIG. 3 is a side view of the oil pipe and the oil cap according to the first embodiment.
FIG. 4 is a perspective view of the vicinity of the opening of the crankcase cover according to the first embodiment.
FIG. 5 is a front view of a vertical axis engine equipped with a long oil pipe of a first conventional example.
FIG. 6 is a side view of a long oil pipe of a first conventional example.
FIG. 7 is a cross-sectional view of a main part of a long oil pipe of a first conventional example.
FIG. 8 is a front view of a vertical axis engine equipped with a short oil pipe of a second conventional example.
FIG. 9 is a cross-sectional view of a main part of a short oil pipe of a second conventional example.
FIG. 10 is a cross-sectional view of an essential part of a short split oil pipe of a third conventional example.
FIG. 11 is a cross-sectional view of a principal part of a long split oil pipe of a fourth conventional example.
[Explanation of symbols]
2 ... conventional crankcase cover, 52 ... crankcase cover, 52a ... opening, 52c ... opening inner periphery, 52e ... boss, 54 ... oil pipe, 54a ... flange, 57 ... O-ring, 59 ... bolt, l ... The length from the top of the opening.

Claims (2)

An opening is provided above the crankcase cover, the lubrication system of the general-purpose engine mounted oil pipe for injecting the lubricating oil into the opening,
The opening (52a) is formed with an O-ring seal portion (52c) having a larger diameter than the fitting hole on the inner periphery on the fitting hole (52b) to be fitted with the oil pipe (54).
On the other hand, on the oil pipe (54) side, a bolt hole (54g) is formed in the flange portion (54a) positioned at the upper portion of the O-ring mounting portion, and a female screw (52d) is provided on the side portion of the opening facing the bolt hole. Is provided,
The lower part of the oil pipe is supported by being fitted to an opening of the crankcase cover and a boss (52e) provided at a position spaced from the opening, and the outer periphery of the insertion part and the inner periphery of the opening are O A general-purpose engine characterized in that it is sealed by a ring (57), a bolt (59) into which an oil pipe is inserted from the bolt hole is screwed onto the female screw, and the oil pipe is firmly held at two locations. Lubrication device.   The oil lubrication device for a general-purpose engine according to claim 1, wherein the lower end of the oil pipe (54) and the boss (52e) are fitted with a taper to secure the lower part of the oil pipe.

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