JP2618355B2 - Lubrication system for 4-cycle outboard motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for an outboard motor engine, and more particularly to a lubricating device having an oil pump for lubricating oil for lubricating various parts of the engine, and particularly suitable for a four-stroke engine.

[0002]

2. Description of the Related Art In a conventional engine for an outboard motor, particularly a four-stroke engine, a drive shaft of an oil pump is connected to a lower end of a valve operating camshaft, and oil from the oil pump is cranked through an oil passage. It is commonly known that the shaft is guided to a lower end bearing of the shaft, rises inside the crankshaft, reaches an upper bearing, and then lubricates the valve operating camshaft disposed on a cylinder head via an oil passage. (See, for example, JP-A-58-178816).

[0003]

By the way, according to the above-mentioned prior art, since an oil pump is connected to a valve operating camshaft disposed on a cylinder head, the power load on the camshaft becomes excessive and the cylinder head becomes large. In addition, since the oil in the crankshaft flows in one direction from the lower end to the upper end of the crankshaft, the timing and amount of supply of the hydraulic pressure and oil in each bearing of the crankshaft become unbalanced, and particularly, the oil in the upper end bearing is unbalanced. Supply deficiency may occur.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to reduce the size of the crankshaft while providing a compact engine as a whole while providing an oil lubrication device. It is an object of the present invention to provide a four-stroke outboard motor lubricating device that can evenly supply oil to each bearing and can supply oil efficiently.

[0005]

In order to achieve the above object, a lubricating device for a four-stroke outboard motor according to the present invention has an oil pump positioned near a lower end of a vertically installed crankshaft, and an oil feed gallery. The distribution gallery is provided substantially upright in the vicinity of one side of the cylinder body.

Further, the distribution gallery extends up and down from the oil filter.

Further, the oil supply gallery for supplying oil from the oil pump to an oil filter is characterized in that an oil passage provided with a relief valve is branched.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in the drawings. 1 to 9 show an embodiment of the present invention, wherein an engine 10 for an outboard motor is mounted on an upper casing 12 of a propulsion unit via an exhaust guide 14. In this embodiment, the exhaust guide 14 includes upper and lower exhaust guide plates 14A and 14B.

The upper casing 12 is supported on a swivel bracket 16, and the swivel bracket 16 is rotatable left and right by a steering handle 18 integrated with a pivot shaft 17, and is steered. The swivel bracket 16 is vertically rotatably supported by a clamp bracket 20 via a tilt shaft 19, and the clamp bracket 20 is fixed to a stern plate 21 of the hull.

Reference numeral 22 denotes a lower casing, and a propeller 23
The propeller shaft 24 is provided with a drive shaft 2 depending from the engine 10 via the upper casing 12.
5 through a gear group 26 for shifting. Reference numeral 27 denotes a water intake, which sucks seawater by a cooling water pump 28 driven by a drive shaft 25 and supplies the seawater to the engine 10 as cooling water.

Reference numeral 29 denotes a mounting support bolt attached to the steering handle 18, and this mounting support bolt 29 is fitted by a mount rubber 30 as shown in FIG. The mount rubber 30 is sandwiched between an exhaust guide plate 14B of the exhaust guide 14 and a fixing bracket 31 fixed to the plate 14B by mounting bolts 32. Thereby, both plates are fixed to each other by the mounting bolts 32.

As a result, the engine 10, the upper case
The weights of the sing 12 and the lower casing 22 are transmitted from the steering handle 18 via the mount supporting bolts 29 to the clamp bracket 20 via the swivel bracket 16 and the pivot shaft 17.

An exhaust guide plate 14A of the exhaust guide 14 has a function of partitioning an oil receiver for storing oil from a crank chamber, which will be described later, and the exhaust guide plate 14B has a mounting support bolt 29. And a function of partitioning a mount structure including the above and an exhaust expansion chamber described later.

Numeral 34 denotes an oil tank which is conventionally disposed in the upper casing 12, and is mounted on the engine 10 and stored in the cowling 35 in this embodiment. Therefore, the exhaust from the engine 10 is exhaust
The exhaust pipe 37 extends from the exhaust passage 36 formed in the strike guide 14.
And is expanded in an expansion chamber 38 having a sufficiently large volume because the oil tank 34 does not exist. After being silenced here, it descends in the lower casing 22 and the boss of the propeller 23 It is discharged into water from an exhaust outlet 39 formed in the section.

The exhaust gas passing through the exhaust passage 36 and the exhaust pipe 37 is cooled by a water jacket 40 through which cooling water after cooling the engine 10 passes, and the exhaust gas passing through the expansion chamber 38 is cooled by the upper casing 12. Inside the muffler 47 which is housed inside and forms an expansion chamber,
The thing 12 is cooled by cooling water passing through a water jacket 41 formed by the weir wall 12A. Reference numeral 42 denotes a small hole of the water jacket 40, and reference numeral 43 denotes a small hole of the water jacket 41.

The exhaust gas during idling of the engine is discharged from the exhaust pipe 37 and the exhaust expansion chamber 38 to the small exhaust holes 44.
Then, the air is introduced into a sub-exhaust passage 45 formed by a muffler 47, expanded and muffled, and then discharged into the air from an idle exhaust outlet 46.

As particularly shown in FIGS. 3 to 5, an oil tank 34 arranged on the port side of the engine 10 includes:
An inlet cap 49 is attached to the oil inlet 48, and the lower end of the inlet cap 49 extends below and functions as an oil level gauge. A screen 51 is disposed below the oil tank 34, and has a function of preventing air bubbles in the oil from flowing downward.

Reference numeral 52 denotes an oil outlet pipe, which communicates with an oil pump 53 in which an oil feed pump and a lubrication pump are combined. The pump shaft 54 of the oil pump 53 is shown in FIGS.
As shown in FIG. 5, a driving gear 56 fitted to a vertically disposed crankshaft 55 meshes with a driven gear 57, and the driven gear 57 rotates a driving shaft 58 that drives the pump shaft 54, thereby rotating the crankshaft 55. Is done.

Referring to FIG. 9 showing a hydraulic circuit of the lubricating oil, lubricating oil from an oil outlet pipe 52 of an oil tank 34 is driven by a pump shaft 54 of an oil pump 53 so that the oil pump The lubrication pump 59 of the pump 53 is pumped upward to the oil supply gallery 61 via the preset valve 60. This refueling gallery-6
1 is a cylinder body 8 as can be understood from FIGS.
0 is located near one side. The preset valve 60 functions as a check valve that prevents the flow of oil from the oil tank 34 to the engine by the preset load when the engine is stopped horizontally.

The oil is sent from the oil supply gallery 61 to the oil filter 62, where it is filtered again, and then distributed to the bearings of various parts of the engine such as the bearing of the crankshaft 55 via the distribution gallery 63 ( See FIG. 8). A relief valve 64 is disposed in the oil supply gallery 61 to keep the pressure of the supply line of the lubricating oil from the lubricating pump 59 constant. Further, the distribution gallery 63 is also located near one side of the cylinder body 80, and the distribution gallery 6
3 and the oil supply gallery 61 are erected substantially in parallel. The distribution gallery 63 is provided with the oil filter.
It extends vertically from 62 (see FIGS. 3 and 8).

After lubricating the bearings and the like of the crankshaft 55, the oil is introduced into the camshaft 66 through the flow passage 65 as shown in FIG.
After lubricating the components inside, the oil is accumulated in an oil receiver 70 provided below the crank chamber 68 via a screen 69. The oil from the oil receiver 70 is again supplied to the oil pump 7 driven by the pump shaft 54 of the oil pump 53.
2, the oil is returned to the oil tank 34 through the oil return passage 71 through the check valve 73.

The check valve 73 has a function of preventing oil from flowing back from the oil tank 34 when the engine 10 is placed horizontally (see FIG. 7). As shown in FIG. 3, the returned oil rises from the oil return passage 71 and is discharged from the discharge port 74 which opens slightly upward from the center in the up-down direction in the oil tank 34, thereby being discharged and circulated. Care is taken to separate the air bubbles inside.

The oil pump 72 is provided with an oil receiver 70.
When the amount of accumulated oil in the oil tank is small, the air may be sucked and sent into the oil tank 34, and the ventilation passage 75 for letting the air in the oil tank 34 escape into the cylinder head cover 67. Are arranged (see FIG. 5).

In FIGS. 1 and 3 to 5, 77 is a flywheel magnet, 78 is a cylinder head, 79 is a fuel pump, particularly 81 is a piston in FIG. 4, 82 is a carburetor in FIG. An electric motor 84 for starting is an oil level when the outboard motor is placed on its side.

According to the above embodiment, the oil pump 53
Is located near the lower end of the vertically placed crankshaft 55, and the oil supply gallery 61 and the distribution gallery 63 are erected substantially in parallel near one side of the cylinder body 80, so that both gallery 61, 63 are compact. The galleries 61, 63 are heated under the influence of heat from the cylinders, and the viscosity of the oil flowing in the galleries 61, 63 can be reduced.

Since the distribution gallery 63 extends up and down from the oil filter 62, the distance between the distribution gallery 63 and the bearing of the crankshaft can be reduced. The distribution of oil to remote crank bearing members can be done with relatively short piping.

Further, an oil supply gallery 6 for supplying oil from the oil pump 53 to an oil filter 62.
Since the oil flow path provided with the relief valve 64 is branched from the oil passage 1, the oil pressure acting on the oil filter 62 does not exceed a predetermined value. The load on the filter 62 does not become excessive.

[0028]

According to the present invention, the oil pump is positioned near the lower end of the vertically installed crankshaft, and the oil supply gallery and the distribution gallery are set up substantially in parallel near one side of the cylinder body. , Both galleries are arranged compactly and the whole engine can be stored compactly, but each gallery is heated under the influence of the heat from the cylinder and lowers the viscosity of oil flowing in the gallery. As a result, the oil flow becomes more efficient and the lubricating device for a four-stroke outboard motor can maintain the oil flow from the outlet of the oil pump to the oil filter having excessive resistance. .

Further, when the distribution gallery extends up and down from the oil filter, the distance between the distribution gallery and the bearing of the crankshaft can be reduced, and the crank bearing member farthest from the oil filter can be reduced. The oil distribution to the crankshaft bearing members can be evenly distributed since the oil distribution to the crankshaft can be made relatively short.

Further, when an oil passage provided with a relief valve is branched from an oil supply gallery for supplying oil from the oil pump to an oil filter, the pressure of the oil acting on the oil filter becomes predetermined. The oil filter can withstand long-term use and maintain its service life because the oil filter does not overload the oil filter due to the oil filtered by the oil filter. Thus, a lubricating device for a four-stroke outboard motor capable of constantly supplying clean oil to various parts of the engine.

[Brief description of the drawings]

FIG. 1 is a side view showing an outboard motor to which the present invention is applied.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an enlarged sectional view showing a main part of FIG. 1;

FIG. 4 is a sectional view showing the inside of the engine of FIG. 1;

FIG. 5 is an enlarged plan view showing a part of FIG. 1 with a cutout;

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 3;

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 3;

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 3;

FIG. 9 is a hydraulic circuit diagram according to the present invention.

[Explanation of symbols]

 10 Engine 34 Oil tank 53 Oil pump 55 Crankshaft 61 Oil supply gallery 62 Oil filter 63 Distribution gallery 64 Relief valve 80 Cylinder body

Claims (3)

(57) [Claims] 1. An oil tank, an oil pump for pumping oil from the oil tank to various parts of an engine, an oil supply gallery for supplying oil from the oil pump to an oil filter, and an oil filter. And a distribution gallery for supplying oil to each bearing of the crankshaft. In the lubricating system for an outboard motor, the oil pump is positioned near the lower end of the vertically installed crankshaft, and is distributed to the oil supply gallery. A lubricating device for a four-stroke outboard motor, wherein a gallery and a gallery are erected substantially in parallel near one side of a cylinder body. 2. The distribution gallery is provided with an oil filter.
The lubricating device for a four-cycle outboard motor according to claim 1, wherein the lubricating device extends up and down from the lug. 3. An oil supply gallery for supplying oil from the oil pump to an oil filter, wherein an oil passage provided with a relief valve is branched.
A lubricating device for a four-stroke outboard motor according to the above.