JPS6116217A - Lubricating device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To enable automatic bleeding of air in a oil pump, by a method wherein a communication pipe, communicated with the air bleed port of an oil pump, is communicated with the interior of an oil tank at a level higher than that of the location spot of the air bleed port. CONSTITUTION:An oil pump 27 is driven together with an engine 16, and lubricating oil, sucked from an oil tank 25 through a suction pipe 40, is fed to a carburetter 18 of each cylinder through each discharge port 29 and discharge pipes 41A-41C. However, when, for example, an outboard machine 10 is tilted up as shown by a temporary line and is positioned above an oil surface in the oil tank 25, air enters the oil pump 27. In which case, an air bleed port 43 is formed in the topmost part of the oil pump 27, and the air bleed port 43 is communicated with the oil tank 25 at a level higher than that of the location spot of the air bleed port 43 through a communication pipe 44. This causes air in the oil pump 27 to be automatically exhausted in the oil tank 25 through action of buoyancy.

Description

[Detailed description of the invention] [Technical field] The present invention relates to a lubricating device for an internal combustion engine.

[Background Art] One type of lubrication system for internal combustion engines used in outboard motors and the like is a separate lubrication system that supplies lubricating oil in an oil tank to each part of the engine from a separate system from the fuel by operating an oil pump. be.

In the above lubrication system, the oil pump is positioned above the oil level in the oil tank when newly supplying lubricating oil into the oil tank or due to a large change in the attitude of the engine such as when an outboard motor is tilted up. When this occurs, air may enter the oil pump. If the air that has entered the oil pump is left unattended, the smooth operation of the oil pump may be hindered and the engine may seize.

Therefore, in conventional lubricating devices, an air vent is provided in an area above the suction port of the oil pump.
Normal operation of the oil pump can be ensured by exhausting air entering the oil pump from the air vent to the outside space under the action of buoyancy.

However, the air bleed work in the conventional lubricating device described above involves removing the air bleed screw screwed into the air bleed port when the engine is stopped, and removing the air bleed screw when lubricating oil starts leaking from the air bleed port. This involves the complicated operation of screwing the air vent into the air vent again.

[Object of the Invention] An object of the present invention is to automatically bleed air inside an oil pump.

[Structure of the Invention] In order to achieve the above-mentioned object, the present invention provides an internal combustion engine which includes a suction port of an oil pump connected to an oil tank and an air bleed port provided above the suction port in the oil pump. In a lubricating device for an engine, a communication pipe communicating with an air vent of an oil pump is communicated with the inside of an oil tank at a portion above the air vent.

[Detailed Description of the Invention] Fig. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied, Fig. 2 is a side view showing the main parts of Fig. 1, and Fig. 3 is the same. FIG. 2 is a schematic diagram showing main parts of an example.

The outboard motor IO can be fixed to the stern plate 11 of the hull via a clamp bracket 12. A swivel bracket 1 is connected to the clamp bracket 12 via a tilt shaft 13.
4 is supported so as to be tiltable around a substantially horizontal axis, and a propulsion unit 15 is supported on this swivel bracket 14 so as to be steerable and tiltable around a substantially horizontal axis via a steering shaft (not shown). There is.

The propulsion unit 15 is equipped with a three-cylinder engine 16 on its upper part. A carburetor 1 is connected to the crank chamber of each cylinder connected to the engine 16 via an intake manifold 17.
8. The intake box 19 is connected.

A vertical crankshaft 22 is rotatably supported between the cylinder block 20 of the engine 16 and the crankcase 21, and the drive shaft of the propulsion unit 15 is attached to the lower end of the crankshaft 22. 3 are connected.

24 is a piston.

An oil tank 25 is fixedly disposed above the side of the engine 16. 26A is a cap attached to a lubricating oil filler port, and 26B is a level sensor that detects the oil level in the oil tank 25. engine 1
An oil pump 27 is fixedly disposed at the lower side of 6. The oil pump 27 includes a housing 30 having a suction port 28 communicating with the oil tank 25, three discharge ports 29 corresponding to each cylinder, and a driven gear that meshes with a drive gear 31 fixed to the crankshaft 22. 32, a ring gear 33 that meshes with the driven gear 32, and an oil chamber 34 that communicates intermittently with the suction port 28 and each discharge port 29, and is integrated with the ring gear 33 and rotatably supported by the housing 30. a rotating body 35 that is installed in the rotating body 35; a plunger 36 that is housed in the oil chamber 34 of the rotating body 35 and reciprocates up and down within the oil chamber 34; a spring 37 that biases the plunger 36 downward; and a spring 37 that is fixed to the housing 30. The plunger 36 has a cam 39 that can push up the tip of the pin 38 of the plunger 36. That is, when the rotating body 35 rotates within the housing 30 through the meshing of the driving gear 31 and the driven gear 32 and the driven gear 32 and the ring gear 33 as the crankshaft 22 rotates, the rotating body 35 rotates together with the rotation of the rotating body 35. Plunger 3
6 is connected to the oil chamber 34 through the contact between the pin 38 and the cam 39.
A suction pipe 40 performs a pumping action by moving up and down within the suction pipe 40 and is connected to the suction port 28 via a connecting pipe 28A.
The lubricating oil sucked from the oil tank 25 through the outlet pipes 41A to 41C connected to the respective discharge ports 29 via the connecting pipes 29A to 29C is sent to the carburetor 1 of each cylinder.
8, so that it can be discharged into the mixture. Note that each discharge port 29 is provided with a check valve 42 that prevents the lubricating oil from flowing back in the opposite direction to the discharge direction.

Further, the oil pump 27 is provided with an air vent 43 at the uppermost portion in the vertical direction that is connected to the oil chamber 34, that is, at a portion above the location where the suction port 28 is provided. A communication pipe 44 that communicates with the air vent 43 communicates with the internal space of the oil tank 25 above the location where the air vent 43 is provided.

Next, the operation of the above embodiment will be explained.

The oil pump 27 is driven together with the engine 6,
Lubricating oil sucked from the oil tank 25 via the suction pipe 40 is supplied to the carburetor 18 of each cylinder via each discharge port 29 and discharge pipes 41A to 41C.

Therefore, when newly supplying lubricating oil to the oil tank 25, or by tilting up the outboard motor 10 as shown by the two-dot chain line in FIG. When the oil pump 27 is located at a position such as that shown in FIG. Here, an air bleed port 43 is formed at the uppermost portion of the oil pump 27 in the vertical direction, and the air bleed port 43 is connected to the air bleed port 43 through a communication pipe 44 to the uppermost portion of the air bleed port 43. It communicates with the internal space of the tank 25. Therefore, the air entering the oil pump 27 as described above is automatically discharged into the oil tank 25 from the air vent 43 and the communication pipe 44 under the action of buoyancy.

Therefore, according to the above embodiment, the air that has entered the oil pump 27 is automatically exhausted without any complicated operation,
It is possible to ensure normal operation of the oil pump 27.

[Effects of the Invention] As described above, the present invention provides an internal combustion engine in which the suction port of an oil pump is communicated with an oil tank, and an air bleeder is provided in a portion above the suction port of the oil pump. In the lubricating device, a communication pipe that communicates with an air vent of an oil pump communicates with the inside of an oil tank at a portion above the air vent. Therefore, the air that enters the oil pump is discharged into the oil tank from the air bleed port and the communication pipe due to the action of buoyancy, making it possible to automatically bleed the air inside the oil pump. .

The top view and FIG. 3 are schematic diagrams showing the main parts of the same embodiment.

16...Engine, 25...Oil tank, 27.
... Oil pump, 28 ... Suction port, 43 ... Air vent port, 44 ... Communication pipe.

Claims (1)

[Claims] (1) Connect the oil pump suction port to the oil tank,
In a lubricating device for an internal combustion engine, the oil pump is provided with an air vent at a location above the suction port,
A lubricating device for an internal combustion engine, characterized in that a communication pipe communicating with an air vent of an oil pump communicates with the inside of an oil tank at an upper part of the air vent.