JPH04334695A - Outboard motor - Google Patents

Abstract

PURPOSE:To make an outboard motor compact by providing an engine in an outboard motor body with connecting parts to the upper supporting member of an outboard motor fitting means, and forming these connecting parts within a specific range so as to accommodate the upper supporting member within the outside shape of the engine and to suppress the lateral width of the whole outboard motor. CONSTITUTION:In an outboard motor, an engine 21 provided with a crankshaft 22 and plural cylinders 32 is disposed at the upper part of an outboard motor body 20, and there is provided an outboard motor fitting means 1 formed of a stern bracket 2, a swivel case 4, a swivel shaft 5 and an upper and a lower supporting members 11, 16. The engine 21 is further provided with connecting parts 34, 43 to the upper supporting member 11. In this constitution, the respective connecting parts 34, 43 are formed in such positions that at least a part of the upper supporting member 11 faces between the rotational planes of the crank webs 25b, 25c of the crankshaft 22 from the side view and that within the ranges of the rotational loci R of the respective crank webs 25b, 25c from the top view.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to an outboard motor having an engine disposed in the upper part of the main body, having a crankshaft oriented in a substantially vertical direction and a plurality of cylinders arranged vertically in a substantially horizontal direction. By making improvements to the structure of the joint with the upper support member to the engine and the arrangement of the crankshaft, the part of the outboard motor that enters the inside of the hull can be easily removed when the outboard motor is tilted up when the hull is landed. It is designed to be more compact.

0002

[Prior Art] In an outboard motor, the main body side including the engine is attached to a rearwardly extending support provided above and below the attachment means (specifically, a stern bracket, swivel case, swivel shaft, etc.) to the stern of the boat body. The engine has a plurality of cylinder rows arranged vertically so that their axes are substantially horizontal, and is arranged above the support arm on the upper side of the mounting means. When increasing the number of cylinders along with increasing the displacement in order to increase the output, the vertical dimension of the engine increases, and the height of the outboard motor as a whole increases above the upper support arm. . Incidentally, since the outboard motor rotates around a horizontal tilt axis of a portion of the mounting means, the height dimension is approximately equal to the height of the outboard motor when the outboard motor is tilted up, for example, when the hull is unloaded. This is a factor that determines the size of the outboard motor that goes inside the hull.

On the other hand, as a countermeasure for reducing the size and weight of outboard motors by shortening the propulsion unit, a method was proposed in which the upper support arms were connected to both sides of the engine.
This method is known from Japanese Patent No. 9-176192. Similarly, there is an outboard motor in which the upper support arm is connected to both sides of the engine, and a vertical shaft is coaxially connected to the lower end of the crankshaft whose axis is approximately vertical, and the vertical shaft is connected to the lower propeller shaft. A device configured to transmit rotation was also developed in Japanese Patent Application Laid-open No. 1983-
This method is known from Japanese Patent No. 192693.

0004

However, in an outboard motor in which the upper support arm is connected to the side portion of the engine, there is a problem in that the lateral width of the entire outboard motor increases.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to suppress an increase in the horizontal width of the entire outboard motor by devising the structure of the connecting portion between the upper support member and the engine in the first invention; An object of the present invention is to provide an outboard motor in which the portion that enters the inside of the hull can be made more compact when the hull is tilted up during landing, etc. by devising the arrangement of the crankshaft.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has an engine disposed in the upper part, which has a crankshaft oriented in a substantially vertical direction and a plurality of cylinders arranged vertically in a substantially horizontal direction. The stern bracket is fixed to the stern of the boat, and the swivel case is rotatably supported by the stern bracket via a horizontally oriented tilt axis. an outboard motor mounting means comprising a supported swivel shaft oriented in a substantially vertical direction and upper and lower support members provided on the swivel shaft to support the outboard motor main body; An outboard motor provided with a connecting portion to a member is characterized by having the following configuration. That is, in the first aspect of the invention, at least a portion of the upper support member is connected to the coupling portion provided on the engine, and at least a portion of the upper support member is provided on the crankshaft and is configured to rotate upper and lower crank webs corresponding to the plurality of cylinders. The crank web is characterized in that it is formed at a position facing between the two planes and within the range of the rotation locus of the crank web in plan view. In this first invention, the outboard motor main body includes a vertical shaft that transmits rotation of the crankshaft to a propeller shaft disposed at a lower part, and the engine has an axis line of the crankshaft that
A rotation transmission mechanism is provided between the upper part of the vertical shaft and the lower part of the crankshaft, and the upper part is located behind the axis of the vertical shaft when viewed from the side. It is also characterized in that it is tilted forward so that it is located forward from the lower part, and that at least a part of the coupling part provided in the engine is formed in the crankcase and/or the cylinder block, and further in that The support member is also characterized in that it includes an arm portion extending rearward along the coupling portion provided on the engine.

Further, in the second invention, a propeller shaft having a propeller at an outer end and oriented in a substantially horizontal direction is further disposed in the lower part of the outboard motor body, and the rotation of the crankshaft is transmitted to the propeller shaft. The engine has a vertical shaft disposed at an upper and lower intermediate portion, and the engine is arranged such that the axis of the crankshaft is located rearward of the axis of the vertical shaft, and the upper part of the vertical shaft A rotation transmission mechanism is provided between the crankshaft and the lower part of the crankshaft. In the second aspect of the invention, the engine includes an axis of the crankshaft that, when viewed from a side,
Another feature is that the upper part is tilted forward so that it is located forward of the lower part.

[0008]

[Operation] In the first invention, at least a part of the upper support member faces between the rotating planes of the upper and lower crank webs provided on the crankshaft and corresponding to a plurality of cylinders when viewed from the side, and when viewed from the top. Since this is an outboard motor that has an engine on the top of the main body with a connection part formed with the upper support member at a position facing within the range of the rotation locus of the crank web, the upper support is provided within the outer shape of the engine's crankcase, cylinder block, etc. Therefore, the portion of the outboard motor that enters the inside of the hull in the tilted-up state can be made compact, and an increase in the horizontal width of the entire outboard motor can be suppressed. In the second invention, a rotation transmission mechanism is provided between the upper part of the vertical shaft and the lower part of the crankshaft, and the axis of the crankshaft is located behind the axis of the vertical shaft, and the upper support Since this is an outboard motor with an engine mounted on the top of the main body with a connecting part to the parts, the crankshaft is offset to the rear of the vertical shaft, which makes the outboard motor part that goes inside the hull even more compact when it is tilted up. Can be done. By tilting the axis of the crankshaft forward so that the upper part is located forward than the lower part when viewed from the side, the distance from the swivel shaft to the center of gravity of the engine is shortened, and the swivel position is reduced when the hull jumps. The load from the engine on the shaft can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. In FIG. 1 showing a longitudinal cross-sectional side view of an outboard motor according to a first embodiment of the present invention, 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 is rotatably supported through the swivel case 4, a swivel shaft 5 having a substantially vertical axis is rotatably supported by the swivel case 4, and a swivel shaft 5 is integrally provided above and below the swivel shaft 5. It consists of upper and lower support members 11 and 16 that support the outboard motor main body 20, and the upper support member 11 is integrally provided with a mounting portion 6 for an operation handle extending forward or a steering cable for a remote control. It is being The upper and lower support members 11, 16 are provided with left and right bifurcated arm portions 12, 17 extending rearward, and these arm portions 12, 17 support the outboard motor main body 20 via vibration absorbing rubbers 13, 18. be.

The outboard motor main body 20 has an in-line multi-cylinder four-stroke engine 21 disposed in the upper part.This engine 21 has a crankshaft 22 disposed substantially vertically, and a plurality of cylinders extending rearward substantially horizontally. In the embodiment, four cylinders 32 are arranged in the vertical direction, 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
54 is a head cover, 54 is a camshaft, 55 and 56 are rocker arms for intake and exhaust valves, 57 and 58 are intake and exhaust valves, and 59 is a spark plug. The crankshaft 22 has journal parts 23..., crank pins 24..., corresponding to the number of four cylinders.
It is integrally equipped with a pair of crank webs 25, and bearing portions 33, 42, formed between the split surfaces of the cylinder block 31 and the crankcase 41 (Figs. 2 and 3).
(see).

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 formed on the upper end of the crankcase 41 that projects upward. 27 and a flywheel 28 above it;
A driving gear 29 is provided at the lower end of the crankcase 41 that projects downward. Above the engine 21, a timing belt 62 is hung around a camshaft driving pulley 27 at the upper end of the crankshaft 22 and a 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 engine. Furthermore, as shown in FIGS. 3 and 4, an intake manifold 65,
Carburetors 66 corresponding to the cylinders and intake chambers 67 are connected, and an exhaust manifold 69 is connected to the exhaust passages 36 that open on the other side of the cylinder head 51.

[0012] In the above engine 21, three
Lower crank web 2 corresponding to cylinder 32
5b and the upper crank web 25c corresponding to the lower (lowest) cylinder 32, a connecting portion to the bifurcated arm portion 12 of the upper support member 11 is provided. That is, as shown in FIGS. 2 and 3, both crank webs 25
A pair of left and right connecting portions 34 that form a substantially box shape and are continuous within the side walls of the cylinder block 31 and crankcase 41, close to both sides of the bearing portions 33 and 42 that support the crankshaft journal 23c between b and 25c. ,43,3
4 and 43 are integrally formed. This joint part 34, 43, 3
4, 43, a part of which faces within the rotation locus R of both crank webs 25b, 25c, and the bifurcated arms are provided on the front wall of the crankcase 41, continuous with the joints 43, 43. A recessed portion 44 is formed that faces 12. Within these left and right joint parts 34, 43, 34, 43,
By inserting the bifurcated left and right arm portions 12, 12 of the upper support member 11 with the vibration absorbing rubbers 13, 13 interposed therebetween, the outboard motor main body 1 can be moved outboard at the engine 21 portion above the upper support member 11. It is supported on the upper part of the swivel shaft 5 of the machine mounting means 1.

Furthermore, a balancer storage section 45 is formed in the front wall of the crankcase 41, corresponding to the second cylinder 32 from the top, and a balancer mechanism 71 is disposed within this storage section 45. . That is, as shown in FIGS. 2 and 4, the balancer mechanism 71 includes a first balancer 73 supported on a first vertical support shaft 72, and a second vertical support shaft 77 disposed on the side thereof. The second balancer 78 is supported by the second balancer 78. The first balancer 73 has 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 on the upper part thereof, via a damper rubber 75, and a weight part 76 on the lower part.
It is equipped with the following. The second balancer 78 is integrally provided with a driven gear 79 in its upper portion that meshes with the gear 74 of the first balancer 73, and is also integrally provided with a weight portion (not shown) similar to the above. A cover plate 46 for preventing the support shafts 72 and 77 from coming off is bolted to the upper surface of the balancer storage section 45.

As shown in FIG. 1, the outboard motor main body 20 having the engine 21 arranged above is provided with an upper cover 81 and a lower cover 82 that cover the engine 21, and an extension case below the engine 21. 85 are integrally connected, and a vertical shaft 91 is disposed within this extension case 85. A connecting portion 87 is formed on both side walls of the extension case 85 to support the bifurcated arm portion 17 of the lower supporting member 16 via a vibration absorbing rubber 18. In this way, the outboard motor main body 20 is mounted on 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 the vertical span is ensured by the engine 21 above and the extension case 85 below. , 16, the rubber parts 13 and 18 are connected and supported while having vibration absorbing functions, respectively. Note that the lower cover 82 is formed with a notch 83 into which the upper support member 11 is inserted. In addition, the rear lower part of the lower cover 82 and the extension case 8
A rear cover 84 is provided to cover the upper part of the rear part of the engine 21.
An oil pan 88 is coupled to the lower surface.

The vertical shaft 91 is connected to the crankshaft 22.
is transmitted to a propeller shaft having a propeller through a bevel gear mechanism (both not shown) in a gear case (not shown) connected below the extension case 85. This vertical shaft 91 The guide tube 86 is inserted into a guide tube 86 formed in the front part of the tube 85. With respect to the axis V of the vertical shaft 91, the axis C of the crankshaft 22 is offset parallel to the rear. A driven gear 92 that meshes with is provided. 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. Incidentally, the upper end portion of the vertical shaft 91 including the gear 92 is connected to the housing portions 47 and 8 formed on the lower surface of the crankcase 41 and a part of the oil pan 88.
9 is supported by a bearing.

According to the outboard motor having the above structure, at least one of the left and right bifurcated arm portions 12, 12 of the upper support member 11, which is connected to the engine 21 disposed at the upper part of the outboard motor main body 20, is particularly provided. When viewed from the side,
Facing between the rotation planes of crank webs 25b and 25c,
In addition, in plan view, the crank webs 25b, 25
Because of the structure having joints 34, 43, 34, 43 formed on both side walls of the cylinder block 31 and crankcase 41 of the engine 21 at a position facing within the range of the rotation locus R of the engine 21, the cylinder block 31 and the crankcase The bifurcated arm portion 12 of the upper support member 11 is inserted into the outer shape of the engine 21 formed by 41. Therefore, for example, when the hull is unloaded, it is possible to make the portion of the outboard motor 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 horizontal width of the entire outboard motor. .

Because of the structure in which the axis C of the crankshaft 22 is offset rearward from the axis V of the vertical shaft 91, it is possible to further compact the outboard motor portion that enters the inside of the hull in the tilted-up state as described above. It is possible. Incidentally, in this way, the axis C of the crankshaft 22
By independently implementing a structure in which the vertical shaft 91 is offset rearward 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.

Next, a second embodiment will be explained. FIG. 5 shows an outboard motor according to a second embodiment. Components similar to those of the first embodiment are designated by the same reference numerals, and explanations of their structures and effects 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 than the lower part, so that the crankshaft 22 is disposed at the upper part of the outboard motor main body 20. This is because the engine 21 itself is configured to be tilted forward.

According to the structure in which the axis C of the crankshaft 22 is tilted forward so that the upper part is located forward than the lower part when viewed from the side, the engine 21 coupled and supported by the upper support member 11 is tilted forward. In the posture, swivel axis 5
Since the distance to the center of gravity of the engine 21 can be shortened based on , the weight load from the engine 21 applied to the swivel shaft 5 can be reduced, for example, when the ship jumps. In the above embodiment, an in-line 4-cylinder 4-cycle engine is used, but it is sufficient that the number of cylinders is at least 2, and it goes without saying that the present invention can also be applied to a 2-stroke engine.

[0020]

[Effects of the Invention] As described above, according to the outboard motor of the present invention,
In the first invention, at least a part of the upper support member faces between the rotating planes of the upper and lower crank webs provided on the crankshaft and corresponding to the plurality of cylinders when viewed from the side, and when viewed from the top, In order to equip the upper part of the main body with an engine that forms a connection part with the upper support member at a position facing within the range of rotation locus of the crank web, the upper support member is built into the outer shape of the engine's crankcase, cylinder block, etc. In this way, the portion of the outboard motor that enters the inside of the hull in the tilted-up state can be made compact, and an increase in the horizontal width of the entire outboard motor can be suppressed. Further, the outboard motor of the second invention is configured such that a rotation transmission mechanism is provided between the upper part of the vertical shaft and the lower part of the crankshaft, and the axis of the crankshaft is located behind the axis of the vertical shaft. In addition, since the engine with the connection part to the upper support member is installed on the top of the main body, the crankshaft is offset to the rear of the vertical axis, and the outboard motor part that enters the inside of the hull in the tilt-up state is further reduced. Can be made compact. By tilting the axis of the crankshaft forward so that the upper part is located forward than the lower part when viewed from the side, the distance from the swivel shaft to the center of gravity of the engine can be shortened. The load from the engine on the shaft can be reduced.

[Brief explanation of the drawing]

[Fig. 1] A longitudinal side view showing an outboard motor according to a first embodiment to which the present invention is applied.

[Fig. 2] Enlarged view of the main parts showing the connection part by the upper support member and the balancer mechanism part

[Fig. 3] A cross-sectional plan view of the joint section using the upper support member.

[Fig. 4] Cross-sectional plan view of the balancer mechanism section

[Fig. 5] A longitudinal 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... Operation 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... Connection portion,
41...Crankcase, 91...Vertical axis, C...Axis of the crankshaft, R...Rotation trajectory of the crank web, V...Axis of the vertical axis.

Claims (7)

[Claims] Claim 1: An outboard motor body consisting of an engine having a crankshaft oriented in a substantially vertical direction and a plurality of cylinders arranged vertically in a substantially horizontal direction, and an outboard motor body, which is fixed to the stern of the hull. A stern bracket, a swivel case that is swingably supported by the stern bracket via a tilt shaft that is oriented in the horizontal direction, a swivel shaft that is rotatably supported by the swivel case and is oriented in a substantially vertical direction, and this swivel shaft. an outboard motor mounting means comprising upper and lower support members for supporting the outboard motor main body, and the outboard motor is provided with a connecting portion to the upper support member on the engine; The coupling portion provided in
At least a portion of the upper support member faces between the rotation planes of the upper and lower crank webs provided on the crankshaft and corresponding to the plurality of cylinders when viewed from the side, and faces between the rotation planes of the upper and lower crank webs that are provided on the crankshaft and correspond to the plurality of cylinders when viewed from the top. An outboard motor characterized by being formed in a position facing within the range of the rotation locus. 2. The outboard motor main body includes a vertical shaft that transmits the rotation of the crankshaft to a propeller shaft disposed at a lower part, and the engine has an axis line of the crankshaft that is
A rotation transmission mechanism is provided between the upper part of the vertical shaft and the lower part of the crankshaft, and the upper part is located behind the axis of the vertical shaft when viewed from the side. The outboard motor according to claim 1, wherein the outboard motor is tilted forward so as to be located forward of the lower part. 3. The outboard motor according to claim 1, wherein at least a part of the coupling portion provided in the engine is formed in a crankcase. 4. The outboard motor according to claim 1, wherein at least a portion of the coupling portion provided in 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 coupling portion provided on the engine. 6. A propeller oriented in the substantially horizontal direction and having a crankshaft oriented in the substantially vertical direction and an engine having a plurality of cylinders arranged vertically in the substantially horizontal direction arranged at the top and having a propeller at the outer end. An outboard motor body comprising a shaft disposed at the bottom and a vertical shaft disposed in the upper and lower middle portion for transmitting the rotation of the crankshaft to the propeller shaft, a stern bracket fixed to the stern of the hull, and the stern bracket. a swivel case that is swingably supported via a tilt shaft that is oriented in the horizontal direction; a swivel shaft that is rotatably supported by the swivel case and is oriented in a substantially vertical direction; In the outboard motor, the outboard motor is provided with an outboard motor mounting means consisting of upper and lower support members that support the outboard motor main body, and in which the engine is provided with a connecting portion to the upper support member. What is claimed is: 1. An outboard motor, wherein the outboard motor is arranged such that its axis is located rearward of the axis of the vertical shaft, and a rotation transmission mechanism is provided between an upper part of the vertical shaft and a lower part of the crankshaft. 7. The outboard motor according to claim 6, wherein the engine is configured such that the axis of the crankshaft is tilted forward so that the upper part is located forward of the lower part when viewed from the side.