JPH0633737B2 - Outboard motor - Google Patents

Description

Detailed Description of the Invention A. OBJECT OF THE INVENTION (1) Field of Industrial Application The present invention relates to an outboard motor, particularly an engine having a crankshaft vertically arranged, a recoil starter for cranking the crankshaft, and covers the engine and the starter. An engine cover is provided, the starter is a rope pulley that is interlocked with a rope handle via a starter rope, and when the rope pulley is rotationally driven by a forward pulling operation of the rope handle, the starter is interlocked with the rope pulley on the clamp shaft side. The present invention relates to an outboard motor of a type including a pinion gear that meshes with a ring gear and that rotates.

(2) Conventional technology In this type of conventional outboard motor, since the recoil type starter is installed on the upper part of the engine, there is a disadvantage that the total height of the outboard motor is increased by that much, and the position of the rope pulley of the starter is further increased. Since the position is higher than the position of the rope handle arranged in front of the engine, a guide means for bending the path of the starter rope that connects the rope pulley and the rope handle in the middle is required, and not only is the structure complicated, There was also a drawback that the life of the starter rope was somewhat impaired.

(3) Problems to be Solved by the Invention Therefore, in order to solve these drawbacks, for example, Japanese Patent Publication No. 58-4
As disclosed in Japanese Patent No. 8749, a recoil type starter is arranged laterally of the engine and at a position lower than the uppermost part of the engine, and the rope pulley and the rope handle thereof are already arranged side by side on the same vertical plane. In this proposal, the rotation axis of the rope pulley is arranged horizontally so that the pinion gear of the starter can be meshed with the ring gear engraved on the outer circumference of the flywheel at the upper end of the vertically arranged crankshaft. In addition, because the starter is eccentrically located on one side in the left-right direction of the engine, the space directly under the starter in the engine cover becomes narrow, and it cannot be effectively used as a routing space for various transmission systems. , The starter rope pulley (hence the rope handle) needs to be installed eccentrically to one side in the left-right direction of the engine. There is another problem that the degree of freedom of is narrowed.

The present invention has been proposed in view of the above, and an object thereof is to provide an outboard motor that can solve all of the above-mentioned drawbacks and problems of the conventional ones.

B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above object, a first invention is an outboard motor of the type described above, in which a cylinder block of an engine is arranged rearward of a hull and the engine is Of the starter is arranged in front of the engine and lower than the uppermost part of the engine, and the rotation axis of the rope pulley of the starter is substantially vertical, and the rope handle is arranged substantially in the same horizontal plane as the front side of the pulley. And a transmission system for connecting between the engine and an accessory device installed outside the engine cover is arranged so as to pass under the starter.
In addition to the above features, the invention provides a steering handle having a throttle grip on an outer surface of one side of an engine cover, and a carburetor operated by the throttle grip via a throttle wire is used as the steering handle of the engine. Is disposed on the opposite side surface of the end portion, and the throttle wire is disposed so as to pass below the starter.

(2) Operation According to the above configuration, the starter is arranged in front of the engine and at a position lower than the uppermost part of the engine, so that the outboard motor is provided as compared with the conventional structure in which the starter is arranged above the engine. The overall height of the engine is reduced and the dead space between the front of the engine and the hull can be effectively used. Further, the rotation axis of the rope pulley of the starter is substantially vertical and the rope handle is arranged on the front side of the pulley on substantially the same horizontal plane as that of the starter so that the pull-out path of the starter rope becomes linear, and the rope pulley (hence the rope handle) Can be installed on the front side of the middle portion of the engine in the left-right direction with a relatively wide degree of freedom in the left-right direction. Furthermore, the vertical arrangement of the rotation axis of the rope pulley makes it possible to secure a relatively large space directly under the starter inside the engine cover, so that the transmission system that connects the accessory equipment on the outside of the engine cover and the engine can be handled without difficulty. be able to.

According to the structure of the second aspect of the invention, the steering handle base and the carburetor can be separated as much as possible by sandwiching the engine in the engine cover. Therefore, the throttle wire connecting the two is bent with a relatively large radius of curvature. The throttle operation force is reduced accordingly.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the engine E of the outboard motor is a crankshaft 1
Is arranged vertically, and the rotational torque of the crankshaft 1 is transmitted to a horizontally arranged propeller shaft 4 via a vertically arranged drive shaft 2 and a bevel gear transmission 3 to rotationally drive a propeller 5.

An extension case 7 for accommodating the drive shaft 2 is sequentially attached to a lower surface of the engine E, and a gear case 8 for accommodating the bevel gear transmission 3 in an oil-tight manner is sequentially attached to a lower surface of the case 7.

The extension case 7 has a pair of upper and lower extension brackets 9 and 9 ′ protruding forwardly attached thereto via elastic support members 10 and 10. The extension brackets 9 and 9 ′ are substantially vertical arrangement swivel shafts 11. Is operably connected to the swivel case 12 via. The swivel case 12 is vertically tiltably connected to the upper parts of a pair of left and right stern brackets 14, 14 which are detachably fixed to the stern plate Sa of the hull S by a clamper 13 via a horizontal pivot 15.

A handle bracket 16 is integrally formed with the upper extension bracket 9, and a steering handle 17 is pivotally attached to the handle bracket 16. The steering handle 17 protrudes forward from an outer surface on one left and right side of an engine cover 42 described later. There is.

As shown in FIG. 2, the engine E includes the crankshaft 1
And a cylinder block 22 for accommodating a piston 21 connected to the crankshaft 1.
And a cylinder head 23 bonded to the end surface of the cylinder block 22, and the cylinder block 22 is formed integrally with the crankcase 20 at a position facing the rear of the hull S.

A ring gear 25 for starting is fixedly mounted on the lower surface of the flywheel 24 fixed to the upper end of the crankshaft 1, and a recoil type starter 26 for driving the ring gear 25 is close to the crankcase 20 and in front of it. In addition, it is installed at a position lower than the uppermost part of the engine E (the flywheel 24 in the illustrated example). The structure of the starter 26 will be described below.

A substrate 27 of the starter 26 is fixed to a plurality of bosses 28, 28 formed in the upper half of the front surface of the crankcase 20 via a plurality of bolts 29, 29 ... (See FIG. 2A). A rope pulley 31 is fitted on a support shaft 30 that is integrally provided upright on the base plate 27 and that is parallel to the crankshaft 1 so as to be rotatable around its vertical axis. A pinion gear 33 is slidably fitted to the upper outer periphery of the boss 31 a of the rope pulley 31 via a helical spline 32. The pinion gear 33 is the ring gear 25.
It is possible to move between an operating position in which the ring gear 25 is engaged with the inactive position and a non-operating position in which the ring gear 25 is disengaged downward and supported on the upper surface of the rope pulley 31.

A pinion spring 35 is provided in the outer peripheral groove 34 of the boss of the pinion gear 33.
Frictionally engages with the pinion gear 33 to provide a light rotation resistance, and the pinch spring 35 is engaged with a detent piece 36 provided at the upper end of the support shaft 30 so as to be vertically slidable.

A starter rope 38 is wound around an annular rope groove 37 of the rope pulley 31. An inner end of the starter rope 38 is connected to the rope pulley 31, and an outer end thereof is connected to a rope handle 39 located on the front side of the rope pulley 31. The rope handle 39 is a rising portion 27 of the board 27 that rises so as to face the front surface of the rope pulley 31.
a It is normally received in a cup-shaped handle receiver 40 attached to the outer surface. In this way, the rope pulley 31 and the rope handle 39 are juxtaposed on substantially the same horizontal plane.

On the lower surface of the rope pulley 31, attach this to the starter rope 3
A mainspring spring 41 for biasing the winding direction of 8 is attached.

1 to 4, the engine cover 42 that covers the engine E and the starter 26 is divided into an upper cover 42a and a lower cover 42b. And the lower cover 4
2b is fixed to the crankcase 20 and the cylinder block 22 by a fixing member (not shown), and the upper cover 42a.
Is openably and closably attached to the lower cover 42b.

A window 43 facing the handle receiver 40 is opened on the front surface of the upper cover 42a, and an inward opening end of the window 43 is closed around the handle receiver 40 by a downward extension 59a of a starter cover 59 that covers the starter 26. . In this way, seawater, dust, etc. are prevented from entering the engine cover 42 through the window 43.

A front wall of the lower cover 42b serves as an operation panel 44, and a choke knob 45, a low oil pressure warning lamp 46, and a fuel hose joint 47 are arranged on the outer surface thereof. As shown in FIG. 3, the choke knob 45 is connected to the choke lever 50 in the carburetor 49 of the engine E via the choke wire 48, and the carburetor 4 is pulled by the knob 45.
The choke valve 9 is closed. The carburetor 49 is disposed on the side surface of the end portion (rear end portion in the illustrated example) of the engine E opposite to the steering handle 17.

The low oil pressure alarm lamp 46 is connected via a lead wire 58 to a hydraulic switch 51 installed in the lubricating oil passage of the engine E, and when the oil pressure in the lubricating oil passage falls below a predetermined value, the hydraulic switch 51 closes and the lamp is closed. 46 is turned on. The fuel hose joint 47 is connected to a suction port of a fuel pump 53 of the engine E via a fuel pipe 52, and a fuel hose extending from a fuel tank installed in the hull S is connected to the joint 47.

A throttle pulley 55 rotated by a throttle grip 54 attached to the tip of the steering wheel 17 is housed in the steering wheel 17.
5 is connected to the throttle lever 57 of the carburetor 49 via the throttle wire 56, and the throttle valve of the carburetor 49 is opened / closed by rotating the throttle grip 54. Thus, the carburetor 49 and the steering wheel 1
The base of No. 7 is the engine E in the engine cover 42.
Since they are located on the opposite sides of each other and can be separated from each other as much as possible, the throttle wire 56 connecting the two can be bent with a relatively large radius of curvature, and the throttle operating force can be reduced accordingly. .

The choke wire 48, the lead wire 58, the fuel pipe 5
2 and the throttle wire 56 are arranged in the engine cover 42 so as to pass below the starter 26. Thus, the choke knob 45, the low oil pressure warning lamp 46, the fuel hose joint 47 and the throttle grip 54 correspond to the accessory of the present invention, and the choke wire 48, the lead wire 58, the fuel pipe 52 and the throttle wire 56 correspond to each other. It corresponds to a transmission system that connects the accessory device and the engine E.

Next, the operation of this embodiment will be described.

To start the engine E, the rope handle 31 is grasped and the starter rope 38 is pulled, and the rope pulley 31 is rotated. On the other hand, since the pinion gear 33 receives rotation resistance from the pinch spring 35, the rotating rope pulley 31
Causes upward thrust to the pinion gear 33 via the helical spline 32, and the thrust causes the pinion gear 33 to rise and mesh with the ring gear 25 of the engine E. After the meshing, the pinion gear 33 is prevented from rising, so that the pinion gear 33 rotates together with the rope pulley 31 while causing a slip between the pinion gear 33 and the pinch spring 35 to drive the ring gear 25. Thus crankshaft 1
Are cranked and the engine E is started.

When the pinion gear 33 is driven from the ring gear 25 this time with the start of the engine E, the pinion gear 33 receives the thrust downward from the helical spline 32, descends, and is released from meshing with the ring gear 25. When the rope handle 39 is released, the rope pulley 3
1 reverses by the twisting force of the mainspring 41 and winds the starter rope 38 into the rope groove 37.

C. As described above, according to the present invention, the cylinder block of the engine is arranged toward the rear of the hull, and the starter is arranged in front of the engine and lower than the uppermost part of the engine. With this arrangement, the total height of the outboard motor can be made as low as possible while effectively utilizing the dead space between the front surface of the engine and the hull, and the overall outboard motor can be made compact.

Further, since the rotation pulley of the starter is arranged so that the rotation axis of the pulley is substantially vertical and the rope handle is arranged on the substantially horizontal plane with the front side of the pulley,
The pull-out path of the starter rope can be formed linearly, the conventional guide means for the starter rope is unnecessary or significantly simplified, and the life of the starter rope is improved. Moreover, the rope pulley, and thus the rope handle, can be installed in the front of the middle portion of the engine in the left-right direction with a relatively wide degree of freedom in the left-right direction.

Furthermore, the vertical arrangement of the rotation axis of the rope pulley makes it possible to secure a relatively large space directly under the starter inside the engine cover, so that the transmission system that connects the accessory equipment on the outside of the engine cover and the engine can be handled without difficulty. Therefore, it is possible to effectively utilize the space, and even if the inside of the engine cover is relatively narrow, it is possible to easily avoid interference with other objects of the transmission system arranged therein.

Further, in particular, according to the second aspect of the present invention, a steering handle having a throttle grip is provided on one outer surface of the engine cover, and the carburetor operated by the throttle gripper via the throttle wire is used as the steering handle of the engine. Is arranged on the side surface of the opposite end, and the throttle wire is arranged so as to pass under the starter.
In the engine cover, the steering handle base and the carburetor can be separated as much as possible with the engine sandwiched between them, and the throttle wire connecting them can be bent with a relatively large radius of curvature, which reduces throttle operation force accordingly. Can contribute.

[Brief description of drawings]

1 is a partially longitudinal side view of an outboard motor that is an embodiment of the present invention, FIG. 2 is an enlarged vertical side view of the engine section of FIG. 1, and FIG. 2A is the bottom surface of the starter substrate of FIG. FIG. 3 and FIG. 3 are plan views of the engine section, and FIG. 4 is a front view thereof. E ... Engine, S ... Hull, 1 ... Crankshaft, 17
...... Steering wheel, 22 ... Cylinder block, 25 ...
… Ring gear, 26 …… Recoil starter, 31 ……
Rope pulley, 33 ... pinion gear, 38 ... starter rope, 39 ... rope handle, 45, 46, 47
・ 54 …… Choke knob as accessory ・ Low oil pressure warning lamp ・ Fuel hose joint ・ Throttle grip, 48 ・ 52 ・ 56 ・ 58 …… Choke wire as transmission system ・ Fuel pipe ・ Throttle wire ・ Lead wire,
49 ... Vaporizer

Claims (2)

[Claims] 1. An engine (E) in which a crankshaft (1) is arranged vertically, a recoil type starter (26) for cranking the crankshaft (1), and the engine (E) and the starter (26). ) Engine cover (4
2), the starter (26) interlocks with a rope handle (39) via a starter rope (38), and the rope pulley (31) is located in front of the rope handle (39). An outboard motor having a pinion gear (33) that meshes with and rotates with a ring gear (25) on the crankshaft (1) side when being rotationally driven by the towing operation of the engine (E). The cylinder block (22) of the engine is arranged rearward of the hull (S), and the starter (26) is arranged in front of the engine (E) and lower than the uppermost part of the engine (E). , The starter (26) of the rope pulley (31), the rotation axis of the rope pulley (31) is substantially vertical and the rope handle (39) of the pulley (31) And arranged substantially as to be aligned in the same horizontal plane as that on the side, auxiliary equipment the engine cover (42) within which is installed in the engine cover (42) outside (4
5 to 47, 54) and a transmission system (48, 52, 56, 58) for connecting between the engine (E) and the transmission system (48, 52, 56, 58) so as to pass below the starter (26). ,Outboard motor. 2. An engine (E) having a crankshaft (1) arranged vertically, a recoil type starter (26) for cranking the crankshaft (1), and the engine (E) and the starter (26). ) Engine cover (4
2), the starter (26) interlocks with a rope handle (39) via a starter rope (38), and the rope pulley (31) is located in front of the rope handle (39). An outboard motor having a pinion gear (33) that meshes with and rotates with a ring gear (25) on the crankshaft (1) side when it is rotationally driven by the towing operation of the engine (E). The cylinder block (22) of the engine is arranged rearward of the hull (S), and the starter (26) is arranged in front of the engine (E) and lower than the uppermost part of the engine (E). , The starter (26) of the rope pulley (31), the rotation axis of the rope pulley (31) is substantially vertical and the rope handle (39) of the pulley (31) Arranged so as substantially aligned in the same horizontal plane as that on the side, on one side an outer surface of said engine cover (42), projecting from the steering wheel (17) having a throttle grip (54), the throttle grip (54)
A carburetor (49) operated by a throttle wire (56) is arranged on the side surface of the engine (E) opposite to the steering handle (17), and the throttle wire (56) ) Is arranged so as to pass below the starter (26).