Mounting structure for internal combustion engine on small planing boat
Providing a mounting structure for an internal combustion engine on a small planing boat on which an internal combustion engine for driving a jet propulsion pump is mounted, in a boat body between a hull and a deck, with a crankshaft thereof oriented in a front-rear direction of the boat body and on which a cylinder of the internal combustion engine is slantly disposed to one of left and right sides of the boat body, the mounting structure taking a weight balance of the internal combustion engine into account. A distance between an axis of the crankshaft and one mounting bracket arranged on a side where the cylinder of the internal combustion engine is slantly disposed, is longer than a distance between the axis of the crankshaft and the other mounting bracket arranged on the opposite side thereof.
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The present application claims priority under 35 USC 119 to Japanese Patent Application No. 2006-157519 filed on Jun. 6, 2006 the entire contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to a mounting structure for an internal combustion engine on a small planing boat.
2. Description of Background Art
In the past, in a mounting structure for an internal combustion engine for a small planing boat wherein the cylinders of an internal combustion engine are slantly disposed to the left or right side of the boat body, the conventional engine mounting brackets are provided on both sides of a crankshaft used to be equidistance away from the crankshaft axis. See, for example JP-A No. 2003-26092.
SUMMARY AND OBJECTS OF THE INVENTIONThe present invention is aimed at providing a mounting structure for an internal combustion engine for a small planing boat with a weight balance of the internal combustion engine taken into account. It is also an aim of the present invention to provide a mounting structure for an internal combustion engine for a small planing boat, wherein the mounting structure allows the internal combustion engine to be removed with ease through a small removal opening provided in the boat body.
To achieve the above aims, an embodiment of the present invention provides a mounting structure for an internal combustion engine for a small planing boat wherein an internal combustion engine for driving a jet propulsion pump is mounted, in a boat body between a hull and a deck, with a crankshaft thereof oriented in a front-rear direction of the boat body and on which a cylinder of the internal combustion engine is slantly disposed to one of left and right sides of the boat body. A distance between an axis of the crankshaft and one mounting bracket arranged on a side where the cylinder of the internal combustion engine is slantly disposed, is longer than a distance between the axis of the crankshaft and the other mounting bracket arranged on the opposite side thereof.
An embodiment of the present invention provides a mounting structure for an internal combustion engine for a small planing boat wherein an intake port is provided on the side where the cylinder of the internal combustion engine is not slantly disposed.
According to an embodiment of the present invention, the internal combustion engine is balanced weightwise in its lateral direction, so that it can be stably supported.
According to an embodiment of the present invention it is possible to remove the internal combustion engine from the boat body without removing the intake pipe and intake devices connected to the intake port. On the intake side of the internal combustion engine, as compared with the exhaust side, many devices are disposed along with many wires and cables including a throttle wire, so that removing such devices is troublesome. Mounting the internal combustion engine in a laterally inclined position and disposing the intake devices on a more spacious side enables the internal combustion engine to be removed through a small removal opening without removing the intake pipe and intake devices.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
The internal combustion engine is a DOHC, inline four-cylinder, four-cycle engine using a dry sump system with the crankshaft 21 oriented in the front-rear direction of the boat body as shown in
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The tank body 71 integrally includes an ACG cover 74 covering a device section 69 which includes the ACG 50 and the driven gear 54 for the starter. The ACG cover 74 thus partitions the oil tank 70 into the device section 69 and an oil section 73. An ACG stator 52 is fixedly bolted in the ACG cover 74. The oil section 73 partitioned by the ACG cover 74 to be outside the device section 69 includes an oil reservoir 81, oil passages, and an oil cooler housing.
A scavenging pump case 75 and a feed pump case 76 are attached, in the mentioned order, to the front of the tank body 71. The tank cover 72 is attached to the front of the tank body 71 such that it covers the pump cases. A pump shaft 77 extending through the scavenging pump case 75 and the feed pump case 76 is disposed to be on an axis extended from the crankshaft 21. The pump shaft 77 is connected to the forwardly projecting portion 21a of the crankshaft 21 via a shaft coupling 78 inside the ACG cover 74. A scavenging pump 79 coupled to the pump shaft 77 is provided in the scavenging pump case 75. A feed pump 80 coupled to the pump shaft 77 is provided in the feed pump case 76.
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The present embodiment described in detail above brings about the following effects:
The internal combustion engine is balanced weightwise in its lateral direction, so that it can be stably supported.
(2) The internal combustion engine is mounted in an inclined position, intake pipe and intake devices 87 are disposed on a more spacious side of the internal combustion engine, and a distance between the axis of the crankshaft and one mounting bracket which is disposed on an opposite side where the other mounting bracket is slantly disposed is shortened. As a result, it is made possible to remove the internal combustion engine through a small removal opening without removing the intake pipe and intake devices 87.
The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
Claims
1. A mounting structure for an internal combustion engine on a small planing boat for mounting an internal combustion engine for driving a jet propulsion pump, in a boat body between a hull and a deck, with a crankshaft thereof oriented in a front-rear direction of the boat body and on which a cylinder of the internal combustion engine is slantly disposed to one of left and right sides of the boat body, comprising:
- a distance between an axis of the crankshaft and one mounting bracket arranged on a side where the cylinder of the internal combustion engine is slantly disposed, is longer than a distance between the axis of the crankshaft and the other mounting bracket arranged on the opposite side thereof.
2. The mounting structure for an internal combustion engine on a small planing boat according to claim 1, wherein an intake port is provided on the side where the cylinder of the internal combustion engine is not slantly disposed.
3. The mounting structure for an internal combustion engine on a small planing boat according to claim 1, wherein a vertical plane V passes through the axis of the crankshaft and an axis C of the cylinders is displaced at an angle relative to the vertical plane V.
4. The mounting structure for an internal combustion engine on a small planing boat according to claim 1, wherein the small planing boat includes left and right mounts that are substantially perpendicular to the vertical plane V.
5. The mounting structure for an internal combustion engine on a small planing boat according to claim 4, and further including left and right mounting brackets secured to respective left and right mounts, said left and right mounting brackets being secured to said internal combustion engine for positioning the internal combustion engine at an angle relative to said left and right mounts.
6. The mounting structure for an internal combustion engine on a small planing boat according to claim 5, and further including vibration insulators operatively positioned between respective left and right mounts and left and right mounting brackets.
7. The mounting structure for an internal combustion engine on a small planing boat according to claim 1, wherein mounting the internal combustion engine at an angle enables the internal combustion engine to be removed from the small planing boat without removing an intake pipe or an intake device.
8. A mounting structure for an internal combustion engine on a planing boat comprising:
- an internal combustion engine for driving a jet propulsion pump, said internal combustion engine being mounted in a boat body between a hull and a deck;
- a crankshaft operatively connected to the internal combustion engine, an orientation of the crankshaft being in a front-rear direction of the boat body and on which a cylinder of the internal combustion engine is disposed at an angle to one of left and right sides of the boat body;
- a distance between an axis of the crankshaft and one mounting bracket arranged on a side where the cylinder of the internal combustion engine is disposed at an angle being longer than a distance between the axis of the crankshaft and the other mounting bracket arranged on the opposite side thereof.
9. The mounting structure for an internal combustion engine on a planing boat according to claim 8, wherein an intake port is provided on the side where the cylinder of the internal combustion engine is not disposed at an angle.
10. The mounting structure for an internal combustion engine on a planing boat according to claim 8, wherein a vertical plane V passes through the axis of the crankshaft and an axis C of the cylinders is displaced at an angle relative to the vertical plane V.
11. The mounting structure for an internal combustion engine on a planing boat according to claim 8, wherein the planing boat includes left and right mounts that are substantially perpendicular to the vertical plane V.
12. The mounting structure for an internal combustion engine on a planing boat according to claim 11, and further including left and right mounting brackets secured to respective left and right mounts, said left and right mounting brackets being secured to said internal combustion engine for positioning the internal combustion engine at an angle relative to said left and right mounts.
13. The mounting structure for an internal combustion engine on a planing boat according to claim 12, and further including vibration insulators operatively positioned between respective left and right mounts and left and right mounting brackets.
14. The mounting structure for an internal combustion engine on a planing boat according to claim 8, wherein mounting the internal combustion engine at an angle enables the internal combustion engine to be removed from the planing boat without removing an intake pipe or an intake device.
Type: Application
Filed: Jun 1, 2007
Publication Date: Jan 17, 2008
Applicant:
Inventors: Yosuke Hoi (Saitama), Takayoshi Miura (Saitama), Yoshiaki Noda (Saitama)
Application Number: 11/806,629
International Classification: B63H 21/30 (20060101);