JP2885293B2 - 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 outboard motor in which an engine having a crankshaft oriented substantially vertically and a plurality of cylinders arranged vertically in a substantially horizontal direction is arranged at an upper portion of a main body, and more particularly to an outboard motor. When the outboard motor is tilted up at the time of unloading of the hull, etc., the outboard motor part that enters the hull inside by devising the structure of the connection part with the upper support member to the engine and the arrangement of the crankshaft It is designed to be compact.

[0002]

2. Description of the Related Art In an outboard motor, a main body including an engine has a rearwardly extending support provided above and below mounting means (specifically, a stern bracket, a swivel case, a swivel shaft, etc.) for attaching the hull to the stern. The engine is supported by an arm. In some engines, a plurality of cylinder rows are vertically arranged such that their axes are substantially horizontal, and the engine is arranged above a supporting arm above the mounting means. If the number of cylinders is increased along with an increase in the displacement in order to increase the output, the vertical dimension of the engine increases, and the overall height of the outboard motor from the upper support arm increases. . By the way, since the outboard motor rotates around a horizontal tilt axis of a part of the mounting means, the height dimension is, for example, at the time of unloading of the hull, in a state where the outboard motor is tilted up, This is a factor that determines the size of the outboard motor that enters the inside of the hull.

On the other hand, in order to reduce the size and weight of the outboard motor, as a countermeasure in the case where the propulsion unit is shortened, a structure in which the upper supporting arm is connected to both sides of the engine is disclosed in
It is known from JP 9-176192 A. Similarly, in an outboard motor in which an upper support arm is connected to both sides of an engine, a vertical shaft is coaxially connected to a lower end of a crankshaft whose axis is substantially perpendicular to the lower propeller shaft. A device configured to transmit rotation is also disclosed in
It is publicly known from JP 192693.

[0004]

However, in the outboard motor in which the upper support arm is connected to the side of the engine, there is a problem that the left-right width of the entire outboard motor is increased.

[0005] It is an object of the present invention is devised in the structure of the coupling portion between the upper support member relative to engine, suppressing an increase in lateral width of the entire outboard motor, also devised the arrangement of crank shaft An object of the present invention is to provide an outboard motor capable of reducing the size of a portion that enters the inside of a hull in a tilted-up state when the hull is unloaded by landing.

[0006]

Means for Solving the Problems The above present invention to solve the problem, in claim 1, an engine having a plurality of cylinders arranged in the vertical direction toward the crankshaft and substantially horizontal direction toward the substantially vertical direction the outboard motor body formed by placed on top, stern bracket fixed to the stern of the hull, the swivel case is swingably supported via a tilting axis directed horizontally to the stern bracket, the scan Iberukesu swivel shaft directed substantially vertically pivotally supported, provided及bis Iberu axis, the Sui outboard motor body
And a outboard motor mounting means comprising upper and lower support members for supporting the bell shaft, the且cane engine, preparative outboard motor outboard motor body
In the outboard motor provided with a coupling portion for coupling to the upper supporting member biasing means, binding of upper support member for supporting the front Stories engine
The joining part is a cylinder that is vertically adjacent to the plurality of cylinders.
Between the outboard motor mounting means and the connecting portion.
Of the support member and the mounting support, at least a part of the previous SL upper side of the support member, viewed from the side, the upper and lower crank webs corresponding to the cylinder adjacent to the top and bottom of the plurality of cylinders provided on the crankshaft Position between rotating planes
Together make, in plan view, it characterized that you have to be located within the rotational locus of the crank web.

According to a second aspect of the present invention, there is provided an outboard motor main body.
Is the rotation of the crankshaft on the propeller shaft
A vertical shaft for transmitting the
Set the axis of the crankshaft behind the axis of the vertical axis.
The upper part of the vertical axis and the front part
If a rotation transmission mechanism is provided between the lower part of the crankshaft and
In addition, the axis of the crankshaft is located at the top in a side view.
Is tilted forward so that it is located forward from the bottom.
I do. According to claim 3, the engine according to claim 1 or 2 is used.
At least a part of the connecting portion provided on the crankcase
It is characterized by being formed in a base. In claim 4, claim
Item 1, 2, 3, or provided in the engine
At least a part of the connecting portion is formed in a cylinder block.
It is characterized by having done. In Claim 5, Claim 1,
2. The supporting member according to claim 2, 2, or 4,
Extends rearward along the coupling portion provided on the engine.
It is characterized by having an arm portion which is extended. In claim 6
In claim 1, the outboard motor main body is disposed at a lower portion.
Vertica that transmits the rotation of the crankshaft to the propeller shaft
The axis of this crankshaft is aligned with the vertical axis.
Be located rearward parallel to this axis
And the upper part of the vertical axis and the
The fact that a rotation transmission mechanism is provided between the lower part of the crankshaft and
Features.

[0008]

According to the present invention, the engine is supported.
Adjacent the coupling portion of the upper support member, the upper and lower multiple cylinders that
Provided at a position between adjacent cylinders, at least a part of the upper support member faces a rotation plane of upper and lower crank webs corresponding to the vertically adjacent cylinders provided on the crankshaft in a side view, And in plan view,
At a position facing the range of the rotation locus of the crank web,
Since it is an outboard motor equipped with an engine formed at the upper part of the main body, the upper support member has entered the outer shape of the engine such as the crankcase and the cylinder block. It is possible to make the outboard motor portion to be made compact, and to suppress an increase in the lateral width of the entire outboard motor.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 showing a longitudinal side surface of an outboard motor according to a first embodiment to which the present invention is applied, 1 is an outboard motor mounting means, and 20 is an outboard motor main body. The outboard motor mounting means 1 includes a stern bracket 2 fixed to the stern of a hull (not shown), and a tilt shaft 3 having a horizontal axis on the stern bracket 2.
, A swivel case 4 swingably supported through the swivel case 4, a swivel shaft 5 having a substantially vertical axis line rotatably supported by the swivel case 4, and integrally provided above and below the swivel shaft 5. And upper and lower support members 11 and 16 for supporting the outboard motor main body 20. The upper support member 11 is integrally provided with an operation handle or remote control steering cable mounting portion 6 extending forward. Have been. The upper and lower support members 11 and 16 are provided with left and right bifurcated arms 12 and 17 extending rearward, and the outboard motor main body 20 is supported by the arms 12 and 17 via vibration absorbing rubbers 13 and 18. is there.

The outboard motor main body 20 has an in-line multi-cylinder four-cycle engine 21 disposed at an upper portion thereof. The engine 21 has a plurality of crankshafts 22 disposed substantially vertically and extending substantially horizontally rearward. In the embodiment, four cylinders 32 are arranged vertically, 31 is a cylinder block, 38 is a piston, 39 is a connecting rod, 41 is a crankcase, 51 is a cylinder head, 52 is a combustion chamber, 53
Is a head cover, 54 is a cam shaft, 55 and 56 are rocker arms for intake and exhaust valves, 57 and 58 are intake and exhaust valves, and 59 is an ignition plug. The crankshaft 22 has a journal portion 23, a crankpin 24,
A pair of crank webs 25 are integrally provided. Bearings 33, 42,... Formed between the split surfaces of the cylinder block 31 and the crankcase 41 (FIGS. 2 and 3)
(See Reference).

The crankshaft 22 has a balancer driving gear 26 formed on an upper crank web 25a corresponding to the second cylinder 32 from the top, and a camshaft driving pulley at an upper end protruding above the crankcase 41. 27 and a flywheel 28 above it,
A drive gear 29 is provided at the lower end protruding below the crankcase 41. Above the engine 21, a timing belt 62 is mounted on the camshaft driving pulley 27 at the upper end of the crankshaft 22 and the driven pulley 61 at the upper end of the camshaft 54.
An oil filter 63 and a starter motor 64 for starting (see FIGS. 3 and 4) are provided on the side surface of the.
Further, as shown in FIGS. 3 and 4, an intake manifold 65,
A carburetor 66... Corresponding to the cylinder and an intake chamber 67 are connected, and an exhaust manifold 69 is connected to the exhaust passages 36.

In the engine 21 described above, three
Lower crank web 2 corresponding to the second cylinder 32
5b and the cylinder above and below (lowest)
Upper crank web 25 corresponding to mating cylinder 32
c, the forked arm portion 1 of the upper support member 11
Providing the coupling portions 34, 43 of the two. That is, as shown also in FIGS. 2 and 3, the bearing portions 33, which support the crankshaft journal 23c between the two crank webs 25b, 25c,
A pair of left and right connecting portions 34, 43, 34, 43 which are formed in a substantially box-like shape and are continuous are integrally formed in the side walls of the cylinder block 31 and the crankcase 41 so as to be close to both sides of 42. The coupling portions 34, 43, 34, 43
A part is located within the range of the rotation locus R of the two crank webs 25b and 25c, and the forked arm 12 faces the front wall portion of the crankcase 41 continuously to the coupling portions 43 and 43. A recess 44 is formed. By inserting the left and right arms 12, 12 forming the forked shape of the upper support member 11 by interposing the vibration absorbing rubbers 13, 13 in the left and right joints 34, 43, 34, 43, respectively. The outboard motor body 1 is supported above the swivel shaft 5 of the outboard motor mounting means 1 by the engine 21 above it.

Further, a balancer storage portion 45 is formed on the front wall portion of the crankcase 41 so as to correspond to the second cylinder 32 from the top, and a balancer mechanism 71 is disposed in the storage portion 45. . That is, as shown in FIGS. 2 and 4, the balancer mechanism 71 includes a first balancer 73 supported on a vertical first support shaft 72 and a vertical second support shaft 77 disposed on a side of the first balancer 73. And a second balancer 78 supported by the second balancer 78. The first balancer 73 is provided with a driven gear 74 that meshes with the balancer driving gear 26 of the crank web 25a at a speed increase ratio of 1: 2 via a damper rubber 75 at an upper portion, and a weight portion 76 at a lower portion.
Are integrally provided. The second balancer 78 is integrally provided with a driven gear 79 meshing with the gear 74 of the first balancer 73 at an upper portion, and also integrally provided with a weight portion (not shown) similar to the above. In addition, a lid plate 46 that prevents the support shafts 72 and 77 from coming off is bolted to the upper surface of the balancer storage unit 45.

As shown in FIG. 1, the outboard motor main body 20 having the above-described engine 21 disposed thereon has an upper cover 81 and a lower cover 82 that cover the engine 21 and an extension case below the engine 21. The extension shaft 85 is provided with a vertical shaft 91 disposed therein. On both side walls of the extension case 85, connecting portions 87 for supporting the forked arm portion 17 of the lower supporting member 16 via a vibration absorbing rubber 18 are formed. As described above, the outboard motor main body 20 is provided with the upper and lower support members 11 with respect to the swivel shaft 5 of the outboard motor mounting means 1 at a position where a vertical span is secured by the upper engine 21 and the extension case 85 therebelow. , 16 are connected and supported while having a vibration absorbing function by the rubbers 13, 18. The lower cover 82 has a cutout 83 into which the upper support member 11 is inserted. Also, the lower cover 82 and the extension case 8
5, a rear cover 84 is provided to cover the upper rear portion.
An oil pan 88 is connected to the lower surface.

The vertical shaft 91 is connected to the crankshaft 22.
Is transmitted to a propeller shaft having a propeller via a bevel gear mechanism (both not shown) in a gear case (not shown) connected below the extension case 85. The vertical shaft 91 is provided with an extension case. The guide tube 86 is inserted through a guide tube 86 formed at a front portion in the inside 85. The axis C of the crankshaft 22 is offset rearward and parallel to the axis V of the vertical shaft 91, and the driving gear 29 at the lower end of the crankshaft 22 is provided at the upper end of the vertical shaft 91. And a driven gear 92 that meshes with the gear. Therefore, the rotation of the crankshaft 22 is transmitted to the vertical shaft 91 via the gears 29 and 92 forming a rotation transmission mechanism. Note that the upper end of the vertical shaft 91 including the gear 92 is provided on the lower surface of the crankcase 41 and a storage portion 47, 8 formed on a part of the oil pan 88.
9, and is supported by bearings.

According to the outboard motor having the above-described configuration, the upper support member 11 is formed particularly in the upper support member 11 connected to the engine 21 disposed above the main body 20 of the outboard motor .
The left and right bifurcated arms 12 are shown in FIGS.
Adjacent to the above and below the engine as specified in
Cylinder (the third cylinder from the top, and a lower position of the lower
Connecting portions 34, 43, 3 provided on both sides between
4 and 43 via the vibration absorbing rubbers 13 and 13 as described above.
And at least a part of the arm portions 12 , 12 are connected to the crank webs 25 b, 25 c in a side view.
Between the rotation planes of the engine 21 and within a range of the rotation trajectory R of the crank webs 25b and 25c in a plan view, and formed on both side walls by the cylinder block 31 and the crankcase 41 of the engine 21. Part 3
4, 43, 34, 43, the engine 21 includes the cylinder block 31 and the crankcase 41.
The bifurcated arm portion 12 of the upper support member 11 enters the outer shape of the upper support member 11. Therefore, for example, when the hull is unloaded, it is possible to make the outboard motor portion that enters the inside of the hull in the tilted-up state compact, and it is also possible to effectively suppress an increase in the lateral width of the entire outboard motor. .

Since the axis C of the crankshaft 22 is offset backward from the axis V of the vertical shaft 91, the outboard motor portion that enters the inside of the hull in the tilted-up state can be made more compact as described above. You can do it. Note that, as described above, the axis C of the crankshaft 22 is
Can also be implemented independently by implementing a structure offset from the axis V of the vertical shaft 91, thereby making the outboard motor portion that enters the inside of the hull in a tilted-up state compact.

Next, a second embodiment will be described. FIG. 5 shows an outboard motor according to the second embodiment, in which the same components as those in the first embodiment are denoted by the same reference numerals, and the description of the structure, operation and effect thereof will be omitted. That is, in the second embodiment,
The difference from the first embodiment is that, as shown in the figure, the axis C of the crankshaft 22 is tilted forward so that the upper part thereof is located forward of the lower part, so that it is disposed above the outboard motor main body 20. The engine 21 itself is configured to take a forward leaning posture.

According to the structure in which the axis C of the crankshaft 22 is inclined forward so that the upper part thereof is located forward of the lower part when viewed from the side, the engine 21 coupled and supported by the upper support member 11 is inclined forward. Posture, swivel axis 5
, The distance from the engine 21 to the center of gravity of the engine 21 can be shortened, so that, for example, when the hull jumps, the weight load on the swivel shaft 5 from the engine 21 can be reduced. In the above embodiment, the in-line four-cylinder four-cycle engine is used. However, the number of cylinders may be at least two, and it is needless to say that the invention can be similarly applied to a two-cycle engine.

[0020]

As described above, according to the outboard motor of the present invention,
In claim 1, the crankshaft and the substantially water are oriented substantially vertically.
Has multiple cylinders lined up and down in the horizontal direction
Outboard motor body with engine arranged at the top, and hull ship
Stern bracket fixed to the tail, this stern bra
Swingable via a tilt axis oriented horizontally to the bracket
Swivel case supported, swivelable to swivel case
A swivel shaft oriented substantially vertically and supported by the
Installed on the bell shaft, supporting the outboard motor body on this swivel shaft
Outboard motor mounting means comprising upper and lower support members,
In addition, the outboard motor main body is located above the outboard motor mounting means.
An outboard motor provided with a coupling portion coupled to the support member of
The coupling portion of the upper support member that supports the engine,
Installed between adjacent cylinders above and below multiple cylinders
The connecting portion is provided with a support member on the upper side of the outboard motor mounting means.
Attach and support at least a part of the upper support member
However, when viewed from the side, a plurality of
Above the cylinders corresponding to the cylinders adjacent above and below
Between the plane of rotation of the lower crank web and
In plan view, the range of the rotation locus of the crank web is
Since the upper support member is located within the outer shape of the engine such as the crankcase and the cylinder block , the support member for the outboard motor that enters the inside of the hull in the tilted-up state is included.
The outboard motor can be made compact and the overall width of the outboard motor can be kept from increasing.
Ru it is possible to achieve a compact of. In claim 2, the contract
In addition to the effect of claim 1, the axis of the crankshaft is
At, tilt forward so that the upper part is located ahead of the lower part
The center of gravity of the engine relative to the swivel axis
The hull jumps because the distance to
From the engine on the swivel shaft part
Can be reduced. In claim 6, claim
In addition to the effect of 1, the upper part of the vertical shaft and the crankshaft
A rotation transmission mechanism is provided between the lower part of
Position the line behind the vertical axis
And an end provided with a coupling portion with the upper support member.
Behind the vertical axis to provide the gin at the top of the main unit
Tilt the crankshaft to
The outboard motor that enters the hull
Can be impact.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an outboard motor according to a first embodiment to which the present invention is applied.

FIG. 2 is an enlarged view of a main part showing a coupling part and a balancer mechanism part by the upper support member.

FIG. 3 is a cross-sectional plan view of a joint portion of the upper support member.

FIG. 4 is a cross-sectional plan view of the balancer mechanism.

FIG. 5 is a longitudinal sectional side view showing an outboard motor according to a second embodiment to which the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outboard motor mounting means, 2 ... Stern bracket, 3 ... Tilt shaft, 4 ... Swivel case, 5 ... Swivel shaft, 6 ... Operating handle, 11, 16 ... Support member, 12, 17 ... Arm part, 13, 18: vibration absorbing rubber, 20: outboard motor body,
21 ... engine, 22 ... crankshaft, 25 ... crank web, 29, 92 ... rotation transmission mechanism (gear), 31 ... cylinder block, 32 ... cylinder, 34, 43 ... connecting part,
41: crankcase, 91: vertical shaft, C: axis of crankshaft, R: rotation locus of crank web, V: axis of vertical shaft.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B63H 20/02

Claims (6)

(57) [Claims] 1. An outboard motor main body comprising an engine having a crankshaft oriented substantially vertically and a plurality of cylinders arranged vertically in a substantially horizontal direction arranged at an upper portion, and fixed to a stern of a hull. stern brackets, swivel case is swingably supported via a tilting axis directed horizontally to the stern bracket, swivel shaft directed substantially vertically pivotally supported on the scan Iberukesu,及bis Lee an outboard motor mounting means provided on the bell shaft and comprising upper and lower support members for supporting the outboard motor body on the swivel shaft ;
The且cane engine, the upper side of the outboard motor mounting means outboard motor body
In the support member outboard motor provided with a coupling portion for coupling to the coupling portion of the upper support member for supporting the front SL engine, wherein
Installed between adjacent cylinders above and below multiple cylinders
The connecting portion is provided with a support member on the upper side of the outboard motor mounting means.
At least a part of the upper support member is mounted and supported, and a plurality of cylinders provided on the crankshaft are provided in a side view.
It is located between the rotation planes of the upper and lower crank webs corresponding to the vertically adjacent cylinders, and located within the rotation locus of the crank web in plan view.
To the way, outboard motor, wherein a call. 2. The outboard motor main body includes a vertical shaft that transmits rotation of the crankshaft to a propeller shaft disposed at a lower portion, and the engine moves an axis of the crankshaft behind an axis of the vertical shaft. And a rotation transmission mechanism is provided between the upper portion of the vertical shaft and the lower portion of the crankshaft, and the axis of the crankshaft is positioned such that the upper portion is located forward of the lower portion in side view. The outboard motor according to claim 1, wherein the outboard motor is inclined forward. 3. The outboard motor according to claim 1, wherein at least a part of the connecting portion provided in the engine is formed in a crankcase. 4. The outboard motor according to claim 1, wherein at least a part of the connecting portion provided on the engine is formed in a cylinder block. 5. The outboard motor according to claim 1, wherein the upper support member includes an arm portion extending rearward along the connecting portion provided on the engine. 6. The outboard motor main body is provided with a professional
Vertical shaft transmitting the rotation of the crankshaft to the propeller shaft
The axis of this crankshaft is aligned with the axis of the vertical axis.
To be located rearward so as to be parallel to this
And the upper part of the vertical shaft and the
A rotation transmission mechanism is provided between the bottom of the shaft and the shaft
The outboard motor according to claim 1, wherein