JPS6047795A - Outerboard machine - Google Patents

Abstract

PURPOSE:To improve the vibration-proof performance by bringing the upper resilient member near to the inertia spindle of propulsion unit. CONSTITUTION:The center of gravity of propulsion unit 10 is in the vicinity of a crank case 20 on an inertia spindle (A) of a propulsion unit 10. The plane formed by each resilient bodies 76, 86 is containing the inertia spindle (A). The center of resiliency and at least one resilient spindle formed by each resilient body 76, 80 are in the vicinity or on the plane connecting between each resilient body 76, 80. Consequently, the center of gravity of propulsion unit 10 and the inertia spindle (A) will also be in the vicinity of the center of resiliency and the resilient spindle thus to improve the vibration-proof performance. The upper resilient body 76 is fixed on the front face of the cylinder 18. Consequently, the engine 16 can be arranged at higher position when compared with the case where the resilient body is fixed on the upper face of engine 16. Consequently, the position of engine cover 56 will be higher and advantageous in the view point of water-proof performance of engine.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an outboard motor in which a propulsion unit is supported via an elastic body.

(Prior art) There is an outboard motor in which a swivel bracket attached to the hull side is provided with a pair of upper and lower connecting arms that protrude rearward, and a propulsion unit I is connected to the rear end of these connecting arms via an elastic body. . In a structure in which the propulsion unit is fully elastically supported in this manner, it is desirable that the vibrations in each direction of the propulsion unit be made non-quick, and that the vibration plan be simplified to 1υj J)i4.

For this purpose, the elastic center 1 elastic principal i1i+! formed by each fJtl body is required. It is known from general vibration theory that it is necessary to approach the center of gravity of the propulsion unit and the principal axis of inertia, respectively.

Conventional outboard motor engines are usually equipped with a vertical crankshaft, and the elastic body of the upper connecting arm is placed near the bottom of the engine. Since the drive 11'ul+, IJ+ air passage, etc. that pass vertically through the propulsion unit are arranged, the elastic body on the side or the Usually, the elastic center 1 elastic main axis is located near the plane connecting the upper and lower elastic bodies, so it is difficult to make the vibrations uncoupled, and the vibration-proofing effect tends to be insufficient.

Therefore, it was proposed to provide an upper elastic body on two sides of the engine (US Pat. No. 3,613,631).
ir+4). However, in this case, the upper connecting arm cannot protrude upward much due to its strength, and the engine position is lowered, which is disadvantageous in terms of waterproofing of the engine.

(Object of the Invention) The present invention has been made in view of these circumstances, and it is possible to raise the engine position and make it advantageous in terms of engine waterproofing, while also bringing the two-side elastic body close to the main axis of inertia of the propulsion unit.
The purpose of the present invention is to provide an outboard motor that makes it possible to drive a J-vibration engine.

(Structure of the Invention) In order to achieve this object, the present invention arranges the crankshaft of the engine substantially horizontally and laterally, tilts the cylinder upward and backward, and arranges an upper elastic body near the front of the cylinder. The surface connecting each elastic body is located near the principal axis of inertia in the vertical direction of the propulsion unit. The following is a detailed description of the present invention based on the illustrated embodiments (2).

(Embodiment) Fig. 1 is a surface measurement diagram showing a part of an embodiment of the present invention from the 101 side.
FIG. 3 is a sectional view taken along line 1-11 of the second engine or its engine, and FIG. 3 is a perspective view of the propulsion unit connecting arm. Code 1 in Figure 1゜2
0 is a propulsion unit, and upper casing 12. The lower casing 1/I and the upper casing 12 are equipped with an in-line 2-gas t11 water-cooled 4-stroke engine with a 16-liter engine. The engine 1G includes a cylinder 18 that stands upwardly and is slightly tilted backwards, and a crankshaft 22 is held in a lateral horizontal direction between the cylinder 18 and a base surface of a crankcase 20 below the cylinder 18. cylinder 18
The cylinder head 24, which is separated into two parts, accommodates a known valve mechanism that opens and closes the intake and exhaust valves r using a single-head nicomb shaft 26. In Fig. 2, 45 indicates a belt 28, which transmits the rotation of the crankshaft 22 through this cam 1 iql + 26 L.
1ql+ A flywheel magneto is provided at one end of the 22. In Fig. 1, 32 is a carburetor attached to the front of the cylinder head 24, and 34 is an exhaust pipe also connected to the rear surface. Propulsion unit 10
It is guided downward inside and discharged into the water from the boss portion of the propulsion propeller 36.

40 is an intermediate shaft supported by the side wall of the crankcase 20 so as to be located below the crankshaft 22, and this intermediate shaft 40 has gears 4.2.4.
It is conveyed by 4. A connecting shaft 46 is pivotally supported at the bottom of the crankcase 20 so as to pass vertically through the bottom wall.
The rotation of the intermediate shaft 40 via the bevel gear 48 immersed in lubricating oil in the crankcase 20
46 will be informed.

Note that oil seals are attached to the bearings of the intermediate: li+I+ 4.0 and the connecting shaft 46 to prevent oil from leaking. Further, the connecting shaft 46 is formed with spline internal teeth that open downward.

Reference numeral 50 denotes a drive shaft disposed substantially perpendicularly below the engine 16, and has external spline teeth formed at its upper end, which are fitted into the internal spline teeth of the connecting shaft 46. That is, the drive shaft 50 is splined to the connection dllllt 46.

52 is a substantially horizontal propeller shaft;
The propeller shaft 5 rotates through a forward/reverse switching gear group 54.
2 can be conveyed. This propeller shaft 52 is marked with the m (adjustable propeller 36).

In FIG. 1, reference numeral 56 denotes an engine cover, which is formed into a shallow lid-like shape that extends between the two parts of the upper casing 12, and is attached to the upper casing 12 so as to be opened upward by a hinge 58. 60 is a launcher for fixing the cover 56 in the closed position.

62 is a stern plate, 64 is a clamp bracket fixed to this stern plate 62, and 66 is attached to this clamp bracket 64 so as to be rotatable.
It is a swiveling bracket I-shaped and is normally fixed in the position shown in FIG. 1 by a tilt lock. A steering shaft 70 is rotatably held in the 11111 receiver portion 66A of the swivel bracket 66.
Connecting skins i72, 74 are respectively fixed to the lower ends. The upper connecting arm 72 penetrates the upper casing 12,
It is connected to the front surface of the cylinder 18 via a well-known type elastic body 76 attached to its tip. That is, the elastic body 76 is provided with a burnt rubber member between the inner and outer cylinders, and the inner cylinder is fixed to the connecting arm 72 and the outer cylinder is fixed to the cylinder 18, respectively. The lower connecting arm 74 is formed into a three-pronged shape as shown in FIG. is connected to both the left and right sides of the Jft by these elastic bodies 76°80,
The vibration of the oscillation unit 10 is absorbed and damped. In FIG. 1, 82 is a steering handle fixed to the upper connecting arm 72.

In Figure 2, A is the main axis of inertia in the vertical direction of the propulsion unit 10, and the double center of gravity is located near the crankcase 20 on this main axis of inertia A. Also, each bullet 1: body 76.
The plane formed by 80 includes this principal axis of inertia A. The elastic center and at least one elastic principal axis formed by each elastic body 76.80 are located on or near a plane connecting each elastic body 76.80. Therefore, the promotion unit)], +
The center of gravity of 1 and the principal axis of inertia A are also the elastic centers of 1 elastic principal lq
When i is close to 1, vibration damping performance is improved.

Furthermore, since the elastic body 76 on the L side is placed on the front surface of the cylinder 18, the engine 16 can be placed at a higher position than when the elastic body is placed on two sides of the engine J6. For this reason, an engine cover 56 that covers the engine 16
The position of is also high<';1. j) + It is advantageous in terms of engine waterproofness.

In this example, the engine 1G-1 is a 4-cycle engine with a horizontal crankshaft and a valve mechanism in part, so the overall height of the engine is larger than that of a 2-cycle engine with a vertical crankshaft. This allows the engine to be placed at a high position G-: i'i, which is even more advantageous in terms of engine waterproofing.

Furthermore, since crank 1IllII22 was turned sideways, 1
Parts that require frequent maintenance, such as the spark plug and carburetor, are concentrated on the top of the engine, and the engine cover 56 has a shallow bottom shape, making it possible to perform iTJ. For this reason, the engine cover 56
The position of the sealing surface is also raised, resulting in even better engine waterproofness.

(Effects of the Invention) As described above, the present invention places the crankshaft horizontally, tilts the cylinder backward in the -L direction, and places elastic bodies J-, (tl!I) near the front surface of the cylinder. Since the engine is placed at a relatively high position, the upper elastic body can be moved closer to the vertical elastic main axis of the propulsion unit.For this reason, each of the lower elastic bodies is The connecting surface can be placed near the main axis of inertia in the vertical direction of the propulsion unit, and vibrations transmitted from the propulsion unit to the hull side can be effectively blocked.Also, since the engine position is high, engine waterproofness is improved.Especially engine-1 If you collect the ignition plugs, vaporization, and Kj parts that require maintenance, the engine cover can be made shallower, and the seal casing can also be made very high, further improving the engine's waterproofness.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of one embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line ■-■, and FIG. 3 is a perspective view of the upper and lower connecting arms. 10.G Yu = 7), 16. Engine. 18・Cylinder, 66・Swivel bracket. 72.74・Connection arm, 76.80・Elastic body. A. Principal axis of inertia. Patent applicant Sanshin Kogyo Co., Ltd. Agent Patent attorney Yama RLJ text K4F Figure 1 Figure B

Claims (1)

[Claims] An outboard motor equipped with a pair of upper and lower connecting arms that protrude rearward from a swivel bracket, and a 41f' advance unit that is attached to the rear end of each of these connecting arms via an elastic body. In the above, the engine of the propulsion unit is provided with a cylinder that tilts backward in the direction, and the upper elastic body is disposed near the front of the cylinder, and the surface connecting the elastic bodies is the same as that of the propulsion unit. An outboard motor characterized by a lever located near the main axis of inertia in the vertical direction.