JP2657640B2 - Oil pump device 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 an oil pump device for a four-stroke outboard motor having an oil pump for pumping oil from an oil tank to each bearing of an engine crankshaft.

[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 provide an oil tank separately from an engine and to provide a drive source for an oil pump. It is an object of the present invention to provide an oil pump device for a four-cycle outboard motor in which the whole engine is compactly housed as a crankshaft and oil is efficiently supplied from a pump to each bearing of the crankshaft.

[0005]

To achieve the above object, an oil pump device for a four-stroke outboard motor according to the present invention includes an intake system and an exhaust system for an engine, each of which has a side surface.
And separate the oil tank from the engine
, And the pump shaft of the oil pump is driven via a drive gear mounted below the lowermost crank web of the vertically installed crankshaft in the lower part of the crank chamber, and the discharge side of the oil pump is connected to the engine. On the exhaust system side
A gallery provided on one side of the cylinder body and provided on the discharge side of the pump is formed on the discharge side of the oil pump.
Characterized in that it is erected on the cylinder body on the side face.

Further, the pump shaft of the oil pump is driven via a drive gear mounted below the lowermost crank web of the vertically installed crankshaft in the lower part of the crank chamber and a pump power take-out gear meshing with the drive gear. It is characterized in that it is made to be.

[0007]

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 by 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 mount support bolt attached to the steering handle 18, and this mount 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.

Reference numeral 34 denotes an oil tank conventionally disposed in the upper casing 12. In this embodiment, the oil tank is mounted on the engine 10 and housed in the cowling 35. Therefore, the exhaust gas from the engine 10 flows from the exhaust passage 36 formed in the exhaust guide 14 to the exhaust pipe 37.
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 is formed on the boss portion of the propeller 23. The water is discharged from the exhaust port 39 into the water. And the oil tank 34
Since it is provided separately from the engine 10, its capacity is
It is possible to increase the amount freely.

The exhaust gas passing through the exhaust passage 36 and the exhaust pipe 37 is cooled by a water jacket 40 through which the 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 engine idling 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 the sub exhaust passage 45 formed by the muffler 47, expanded and muffled, and then discharged into the air from the idle exhaust outlet 46. And, in Figure 1 or 5
As is apparent from the above, the intake air of the engine 10 including the carburetor 82
The engine and the exhaust system of the engine 10 including the exhaust pipe 36 are engine
It is distributed to both sides on the side of the housing 10.

As shown in FIGS. 3 to 5, the engine 1
The oil tank 34 disposed on the port side of the port 0 is provided with an inlet cap 49 at an oil inlet 48, and the lower end of the inlet cap 49 extends below and serves as an oil level gauge. Function. 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 outflow 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 the figure, the drive gear 56 fitted to the crankshaft 55 below the lowermost crank web 85 of the vertically installed crankshaft 55 in the lower part of the crank chamber 68 is driven by a driven gear 57.
, And the driven gear 57 is driven to rotate by rotating a drive shaft 58 that drives the pump shaft 54. Ma
The discharge side of the oil pump 53 is shown in FIGS.
5, FIG. 6 and FIG.
Is arranged on one side of the cylinder body 80 on the exhaust system side.
You.

Referring also 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 to be driven by an oil pump. The lubrication pump 59 out of 53 is pumped upward to the oil supply gallery 61 via the preset valve 60. This oil transfer gallery 6
1 is an oil pump 53 as can be understood from FIGS.
Is formed on one side of the cylinder body 80 on the discharge side . When the preset valve 60 is set horizontally when the engine is stopped, the oil tank 34 is set by the preset load.
It functions as a check valve that prevents oil from flowing from the engine to the engine.

The oil from the discharge port of the oil pump 53 is sent to an oil filter 62 from an oil supply gallery 61 erected on the cylinder body 80, where it is filtered again and then erected on the cylinder body 80. Distribution gallery
It is distributed to each bearing of the crankshaft 55 via 63 (see FIG. 8). And the oil supply gallery 61 has a relief valve 6
4 is provided to keep the pressure of the supply line of the lubricating oil from the lubrication pump 59 constant. Further, the distribution gallery 63 is also formed on one side of the cylinder body 80, and the distribution gallery 63 and the oil supply gallery 61 are erected substantially in parallel. The distribution gallery 63 extends vertically from the oil filter 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 backward 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 addition, 77 is a flywheel magnet,
78 is a cylinder head, 79 is a fuel pump, 81 is a piston, 82 is a carburetor, 83 is an electric motor for starting, 84
Is the oil level when the outboard motor is placed on its side.

According to the above embodiment, the engine 10
Distribute the intake system and exhaust system to both sides on the side of the engine 10
And the oil tank 34 is installed separately from the engine 10.
The pump shaft 54 of the oil pump 53 is connected to the crank chamber 6.
Vertical together so as to drive through the drive gear 56 mounted below the crank web 85 at the bottom of the crank shaft 55 at the bottom of the 8, the discharge of the oil pump 53
The side of the cylinder body 80 is the exhaust system side of the engine 10.
Provided on the side, and the discharge side of the formation of the gallery 61 and 63 provided on the discharge side of the pump 53 oil pump 53
Having erected on the cylinder body 80 of the side surface, engine
The oil tank 34, which is separate from the
The amount of the drive gear 56 can be reduced while preventing oil deterioration.
Is sufficiently lubricated by the oil stored in the crank chamber 68, and the oil pump device can be compactly arranged around the crankshaft 55. The oil supply path from the oil pump 53 to the bearing of the crankshaft 55 The gallery 6 is short, and the galleries 61 and 63 are heated under the influence of heat from the cylinder.
It is possible to reduce the viscosity of the oil flowing in the insides 1, 63.

The pump shaft 5 of the oil pump 53
4 is driven through the drive gear 56 and gears 57 and 58 for taking out pump power which mesh with the drive gear 56, so that the installation position of the oil pump 53 is selected with a considerable degree of freedom around the crankshaft 55. it can.

[0026]

According to the present invention, the intake system to the engine and
Distribute the exhaust system to both sides on the side of the engine and
Irutanku the provided separately from the engine, a pump shaft of the oil pump, as well as so as to drive through a drive gear mounted below the bottom of the crank web of the crankshaft vertically at the bottom of the crank chamber, the Oil pump
Discharge side on one side of cylinder body on engine exhaust system side
Provided, and wherein the gallery is provided on the discharge side of the pump
The oil pump, which is separate from the engine, is installed on the cylinder body on the side where the discharge side of the oil pump is formed.
The oil capacity can be freely increased and oil deterioration can be prevented.
In addition , the oil pump device can be integrated around the crankshaft, the entire engine can be compactly housed , and the oil in the crank chamber is lubricated by the drive gear.
The oil supply path from the oil pump to the bearing of the crankshaft can be used smoothly and the gallery is heated under the influence of the heat from the cylinder, and the viscosity of a large amount of oil flowing through the gallery is reduced. since it is possible to reduce the, along with the oil pump device so good efficiency of oil flow, distribution of large parts compared to the intake system
Use the oil side by using the engine
Since the discharge side of the pump, the gallery, etc. are arranged, the engine
The overall balance is maintained and the engine is more compact
4 cycle outboard motor oil pump device.

Further, since the pump shaft of the oil pump is driven via the drive gear and the gear for taking out the pump power which meshes with the drive gear, the installation position of the oil pump is considerably large around the crankshaft. An oil pump device for a 4-cycle outboard motor that can be selected with a degree of freedom.

[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.

[Explanation of symbols]

 Reference Signs List 10 engine 34 oil tank 53 oil pump 54 pump shaft 55 crank shaft 56 drive gear 57 gear for pump power take-out 61, 63 gallery 68 crank chamber 80 cylinder body 85 crank web

Claims (2)

(57) [Claims] An oil pump for pumping oil from an oil tank to each bearing of an engine crankshaft.
In the oil pump device of a cycle outboard motor, the engine
The intake system and exhaust system to the sides of the engine
And the oil tank is provided separately from the engine, and the pump shaft of the oil pump is driven via a drive gear mounted below the lowermost crank web of the vertically installed crankshaft in the lower part of the crank chamber. Along with
Connect the discharge side of the oil pump to the exhaust system side of the engine.
A gallery provided on one side of the dam body and provided on the discharge side of the pump is a side on which the discharge side of the oil pump is formed.
Oil pump device for a four-cycle outboard motor, characterized in that standing on the cylinder body surface. 2. The pump shaft of the oil pump is driven via a driving gear mounted below the lowermost crank web of the vertically installed crankshaft in the lower part of the crank chamber and a gear for taking out pump power which meshes with the driving gear. 2. The oil pump device for a four-stroke outboard motor according to claim 1, wherein the oil pump device is adapted to be operated.