JPS62182412A - Outboard motor - Google Patents

Abstract

PURPOSE:To hold the overall height of an engine down as well as to improve the extent of maintainability, by making an oil pump driving shaft, provided with a driven gear to be engaged with a driving gear of a horizontal crankshaft, orthogonal with a plane surface inclusive of a crankshaft axial center, looking from the shaft end side of the crankshaft. CONSTITUTION:A driving gear 54 is solidly formed in a crankshaft 12 of a 2-cylinder crankcase preload type two-cycle engine as a worm wheel. On the other hand, a driven gear 56 is solidly formed in an oil pump driving shaft 58 as a worm gear, and the driving gear 54 is engaged with this driven gear 56, driving an oil pump 60. The oil pump driving shaft 58 is made to be orthogonal with a plane surface B inclusive of an axial center A of the crankshaft 12 looking from the shaft end side of the crankshaft.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an outboard motor in which a two-stroke engine of a separate oil supply type with a vertical crankshaft is covered with a removable cowling.

(Background of the Invention) It has been considered to adopt a separate refueling system in an outboard motor having a two-stroke engine with a vertical crankshaft. In this system, lubricating oil is supplied separately from fuel by an oil pump. In this case, in an outboard motor where the entire engine is covered with a cowling, it is undesirable that the overall height of the engine increases and the cowling becomes taller due to the adoption of this separate oil supply system. In addition, oil pumps need to adjust the amount of lubricating oil discharged, and are required to be easy to adjust and maintain.

(Object of the invention) This invention was made in view of the above circumstances.
It is an object of the present invention to provide an outboard motor that does not increase the overall height of the engine and the overall height of the cowling, and has an oil pump that is easy to adjust and maintain.

(Structure of the Invention) According to the present invention, the object is to provide an outboard motor in which a separately refueled two-stroke engine with a longitudinally arranged crankshaft is covered with a removable cowling. and a worm gear mechanism formed of a driven gear that meshes with the worm gear mechanism, a drive shaft that is perpendicular to the upper surface including the axis of the crankshaft when viewed from the shaft end side of the crankshaft, and fixed to the outer wall of the engine. This is achieved by an outboard motor characterized in that the outboard motor is equipped with an oil pump and an oil pump, and the rotation of the driven gear is transmitted to the oil pump by the drive shaft.

(Embodiment) Fig. 1 is a partially sectional side view of an embodiment of the present invention, Fig. 2 is a partially sectional plan view of the cowling, and Fig. 3 is a partially sectional side view of an embodiment of the present invention.
The figure is a partially sectional plan view of the engine, and FIG. 4 is a sectional view taken along the line IT-IV in FIG. 1.

In these figures, reference numeral 10 is a two-cylinder crank chamber preload type two-stroke engine, and this engine 10 is equipped with a vertically placed crankshaft 12.

14 is a cylinder block, 16 is a cylinder head, 18
is the crankcase. Each of the upper and lower cylinders is equipped with a piston 20.22 and a connecting rod 24.26, and a carburetor 32.34 is connected to the crank chamber 28.30 of each cylinder.
The air-fuel mixture produced in each is inhaled independently. 36
is a duct attached to the suction side of the carburetor 32,34. Further, 38 and 40 are scavenging passages for the upper and lower cylinders.

The crankshaft 12 is supported by three bearings, and a drive shaft 13 is connected to the lower end of the crankshaft 12 by a spline.

A flywheel magneto 44 is disposed above the upper bearing 42, and a large diameter ring gear 46 is fixed to the flywheel magneto 44 (FIG. 1). In FIGS. 2 and 3, 48 is a starter motor, and a binion (not shown) of the starter motor 48 meshes with the ring gear 46 to rotate the ring gear 46 and the crankshaft 12 when starting the engine. The lower part of the intermediate bearing 50 is connected to the crank chamber 2 of the upper and lower cylinders by a labyrinth seal 52.
8.30 rooms are partitioned. That is, this engine 1
At 0, the upper and lower cylinders rotate with a phase difference of 1800 degrees, so the internal pressures of the crank chambers 28, 30 are in reverse phase, but the flow of the mixture between the two crank chambers 28, 30 is regulated by the labyrinth seal 52. be done. An oil pump drive gear 54 and a driven gear 56 that mesh with the drive gear 54 are disposed below the labyrinth seal 52, that is, in the upper part of the crank chamber 30. The drive gear 54 is a worm wheel integrally formed with the crankshaft 12, and the driven gear 56 is a worm gear integrally formed with the oil pump drive shaft 58. These gears 54.56
A worm gear mechanism is formed. Note that the drive shaft 58 is located at the axis A of the crankshaft 12 when viewed from the shaft end side of the crankshaft 12.
(Fig. 2).

60 is a known plunger type oil pump, which is attached to the outer wall of the engine 10. As shown in FIG. 3, this oil pump 60 includes the oil pump drive shaft 5
The lubricating oil is discharged from the oil chamber 64 to the discharge hole 66 by moving the plunger 62 inserted from the axial end of the plunger 8 back and forth in the axial direction. That is, the plunger 62 is biased in the advancing direction by the coil spring 68, while the pin 70 implanted in the plunger 62 is in sliding contact with a cam 72 that rotates together with the drive shaft 58, and the plunger 62 is pushed into the pin by the rotation of the cam 72. After moving in the exit direction together with 70, the action of returning to the entry direction by the spring force of the coil spring 68 is repeated. In FIG. 3, reference numeral 74 is a discharge amount adjusting pulley that is linked to a throttle valve (not shown) of the carburetor 34, and a pin 78 embedded in the housing 76 is located in a spiral groove 75 formed in the pulley 74. is engaged, and the pulley 74
Due to the rotation of the pulley 74, the cylindrical body 80 integrated with the pulley 74 moves forward and backward in the axial direction. A disk 82 fixed to the end of the plunger 62 engages with the end surface of the cylinder 80 . That is, the cylinder 8
The return position of the plunger 62 in the advancing direction changes due to the forward and backward movement of the plunger 62, and as a result, the amount of lubricating oil discharged is adjusted. Note that lubricating oil is supplied to the oil chamber 64 from an oil tank 90 (see FIG. 1), which will be described later. Sent. The lubricating oil passing through the oil passage 84 is burned in the upper cylinder that has lubricated the upper cylinder, and the lubricating oil passing through the oil passage 86 is similarly burned in the lower cylinder that has lubricated the lower cylinder.

90 is an oil tank. This oil tank 90 has two protrusions 92.94 on its bottom, each protrusion 92.94
are fixed to the upper carburetor 32 and duct 36, respectively. A portion of the bottom of the oil tank 90 bulges downward,
This bulging portion 96 has the oil chamber 6 of the oil pump 60.
4 (Fig. 3) is connected to the pipe 98 (Fig. 1). Note that 100 is a cap for supplying lubricating oil to the oil tank 90, and 102 is an oil meter that indicates the remaining amount of lubricating oil.

Reference numeral 110 denotes a cowling that covers the engine 10, and this cowling 110 is removably attached to a bottom cowling 112 that covers the lower part of the engine 10. That is, a clasp 118 (only one of which is shown in FIG. 1) that can be rotated by knobs 114 and 116 is attached to the cowling 110, and a bent portion at the tip of the clasp 118 is attached to the bottom cowling 112. It can be engaged with and detached from the bent portion at the tip of the stopper 120 fixed to.

An oil supply M122 located above the cap 100 of the oil tank 90 and the oil meter 102 is attached to the cowling 110 so as to be able to open and close upwards around its rear edge. That is, a refueling window is formed in the cowling 110 so as to extend from the upper wall of the cowling 110 to the vicinity of the upper part of the front vertical wall 124 on the duct 36 side.
The refueling lid 122 opens and closes this refueling window.

A substantially U-shaped arm 126 is provided on the inner surface of this refueling lid 122.
is fixed, and is pivoted by a support shaft 130 to a metal fitting 128 fixed to the inner surface near the rear edge of the refueling window. A torsion coil spring 132 is stretched between the arm 126 and the metal fitting 128, and the spring force of this spring 132 causes
The refueling lid 122 is urged in the opening direction (see the imaginary line position in FIG. 1). The cap 100 of the oil tank 90 faces near the center of the oil fill window.

The rotating end of the refueling lid 122 can be fixed in the closed position by a locking means. That is, an engagement metal fitting 134 is provided protruding from the inner surface of the fuel supply lid 122, and an engagement metal fitting 136 that engages and disengages from the engagement metal fitting 134 is attached to the front vertical wall 124. This engagement fitting 136 passes through a guide member 138 fixed to the inner surface of the front vertical wall 124 and extends through the cowling 11.
It is provided with a cylindrical portion 140 that protrudes outward and a hook portion 142 that engages with the engagement fitting 134, and as shown in FIG. Has been given a habit. Note that the tip of the engagement fitting 134 and the hook portion 14
The tips of the two are sloped so that when the refueling lid 122 is closed, they come into contact with each other and the hook portion 142 moves to the right in FIG. 1.4.

In FIG. 1, reference numeral 146 denotes a sealing material that is pressed against the inner surface of the oil supply M122 when the oil supply lid 122 is closed and prevents water from flowing into the cowling 110.

Therefore, when the crankshaft 12 rotates, the driven gear 56 and the oil pump drive shaft 58 are rotated by the drive gear 54.

Therefore, the oil pump 60 operates, sucks in an amount of lubricating oil from the oil tank 90 determined by the throttle valve opening of the carburetor 34 and the rotational speed of the crankshaft 12, and pumps it into the oil passage 8.
4. Discharge to 86.

Since the oil pump 60 is attached to the side surface of the crankcase 18, the oil pump 60 can be easily inspected and maintained by removing the cowling 110. Further, since the oil pump 60 and the drive shaft 58 do not protrude in the length direction of the crankshaft 12, the oil pump 60 does not increase the overall height of the engine 10, and the cowling 110 does not become high.

In this embodiment, as is clear from FIG. 2.3, the drive shaft 58 is arranged parallel to the base surface of the cylinder block 14 and the crankcase 18, and the oil pump 60 is connected to the crankcase in a plane perpendicular to this base surface. It is attached to 18. Therefore, the insertion hole of these drive shafts 58 and the oil pump 6
Since the mounting surface of 0 is perpendicular or parallel to the base surface of the crankcase 18, etc., the machinability of these surfaces is improved.

(Effects of the Invention) As described above, the present invention provides a drive shaft in a direction perpendicular to a plane including the axis of the crankshaft when viewed from the shaft end side of the crankshaft, and uses a worm gear mechanism to drive the rotation of the crankshaft. and is transmitted to the oil pump via this drive shaft. Therefore, the oil pump and its drive shaft do not protrude toward the axial end of the crankshaft, and the height of the engine and cowling does not increase. Furthermore, since the oil pump is fixed to the outer wall of the engine, the oil pump can be easily inspected by removing the cowling, improving its adjustment and maintainability.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of an embodiment of the present invention, Fig. 2 is a partially sectional plan view of the cowling, and Fig. 3 is a partially sectional side view of an embodiment of the invention.
The figure is a partially sectional plan view of the engine, and FIG. 4 is a sectional view taken along the line IV-TV in FIG. 1. DESCRIPTION OF SYMBOLS 10... Engine, 16... Crankshaft, 54... Drive gear, 56... Driven gear, 58... Drive shaft, 60... Oil pump, 110... Cowling, A...・Crankshaft axis, B...plane.

Claims (1)

[Scope of Claim] An outboard motor in which a separately refueled two-stroke engine with a vertical crankshaft is covered with a removable cowling, the outboard motor comprising a drive gear provided on the crankshaft and a driven gear meshing with the drive gear. a worm gear mechanism, a drive shaft perpendicular to a plane including the axis of the crankshaft when viewed from the shaft end side of the crankshaft, and an oil pump fixed to an outer wall of the engine; An outboard motor characterized in that rotation of the driven gear is transmitted to an oil pump by a shaft.