Back to results
US 2002/0173208 A1Published application
Outboard motor
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsMakoto Yonezawa, Sou Abe
Life of this patent
Estimating the term…
Abstract
An outboard motor has an engine and a mounting case disposed below and connected to the engine. The mounting case has a depression opening upward. The opening is covered by a cover to form a coolant chamber. An exhaust passage passes through the coolant chamber and communicates with an exhaust expansion chamber formed by an extension case to be positioned below the mounting case. The coolant chamber is covered by the cover so that a small mating surface is formed with the coolant chamber independently of an engine mating surface of the mounting case. This simplifies the structure of the mounting case.
Claims22
An outboard motor comprising:
- an engine subassembly including a cylinder head constituting part of a combustion chamber and a cylinder block;
- a mounting case having a mating surface for connecting said engine subassembly thereto and a depression opening upward;
- an extension case forming an exhaust expansion chamber below said mounting case;
- an exhaust manifold having an exhaust passage communicating with an exhaust port of said cylinder head;
- a cover covering an opening of said depression to form a coolant chamber;
- an inner passage passing through said coolant chamber, communicating with said exhaust passage of said exhaust manifold and with said exhaust expansion chamber;
- and
- a member for introducing coolant into said coolant chamber.
5 more elements
An engine exhaust passage connecting structure, comprising:
- a first exhaust passage member having a first exhaust passage;
- a second exhaust passage member having a second exhaust passage communicating with said first exhaust passage, said second member being connected to said first exhaust passage member;
- a connecting part of said first exhaust passage member, said connecting part having a wall defining said exhaust passage on an inner peripheral surface thereof and an annular protrusion formed outside said wall to be spaced apart from said wall;
- a connecting part of said second exhaust passage member, said connecting part having a wall defining said exhaust passage on an inner peripheral surface thereof and a wall in a region not defining said exhaust passage;
- a seal interposed between walls of said first and second exhaust passage members, said walls being distanced from said exhaust passage;
- and
- a coolant jacket formed outside said seal.
4 more elements
A V-type vertical engine, comprising:
- a crankshaft disposed substantially vertically;
- cylinder blocks having a plurality of cylinders housing connecting rods connected to said crankshaft and pistons, said cylinders being aligned vertically with the axes forming a V in a plan view;
- two cylinder heads provided on said cylinder blocks, said cylinder heads having exhaust ports, respectively;
- and
- exhaust manifolds fixed to said cylinder heads, said manifolds having exhaust passages communicating with said exhaust ports, wherein:
- each of said cylinder heads has a coolant jacket and a mating surface for connecting said manifold thereto, said mating surface being formed with openings of said coolant jacket;
- each of said exhaust manifolds has a coolant jacket and a mating surface to be connected to said cylinder head, said mating surface being formed with openings of said coolant jacket;
- and
- said openings formed in said mating surface of said cylinder head are formed substantially symmetrically with respect to the horizontal center line of said mating surface.
6 more elements
An outboard motor with a V-type vertical engine mounted thereto, comprising:
- a crankshaft disposed substantially vertically;
- cylinder blocks having a plurality of cylinders housing connecting rods connected to said crankshaft and pistons, said cylinders being aligned vertically with the axes forming a V in a plan view;
- two cylinder heads provided on said cylinder blocks, said cylinder heads having exhaust ports, respectively;
- and
- exhaust manifolds fixed to said cylinder heads, said exhaust manifolds having exhaust passages communicating with said exhaust ports, wherein:
- each of said cylinder heads has a coolant jacket and a mating surface for connecting said manifold thereto, said mating surface being formed with openings of said coolant jacket;
- each of said exhaust manifolds has a coolant jacket and a mating surface to be connected to said cylinder head, said mating surface being formed with openings of said coolant jacket;
- and
- said openings formed in said mating surface of said cylinder head are formed substantially symmetrically with respect to the horizontal center line of said mating surface.
6 more elements
A water-cooled engine, comprising:
- a cylinder head having first exhaust passages with openings, a first coolant jacket, and a plurality of openings of said first coolant jacket provided around said openings of said first exhaust passages;
- an exhaust manifold having second exhaust passages with openings, a second coolant jacket, and a plurality of openings of said second coolant jacket provided around said openings of said second exhaust passages;
- and
- a flow controller for reducing the flow amount of coolant at a desired one of said openings of said first coolant jacket in said cylinder head as compared with that of the other openings.
1 more element
An outboard motor with a water-cooled engine mounted thereto, comprising:
- a cylinder head having first exhaust passages with openings, a first coolant jacket, and a plurality of openings of said first coolant jacket provided around said openings of said first exhaust passages;
- an exhaust manifold having second exhaust passages with openings, a second coolant jacket, and a plurality of openings of said second coolant jacket provided around said openings of said second exhaust passages;
- and
- a flow controller for reducing the flow amount of coolant at a desired one of said openings of said first coolant jacket in said cylinder head as compared with that of the other openings.
1 more element
An outboard motor with a water-cooled V-engine, comprising:
- a V-engine having left and right banks;
- a coolant supply pipe supplying outside water pumped by a single pump as coolant to coolant jackets formed in said left and right banks, respectively;
- and
- an oil pan positioned below said engine, said oil pan having a mounting flange to be mounted to said engine, wherein:
- said mounting flange has an extension extending in a forward direction of said outboard motor, said extension being formed with a depression opening upward, said depression extending in left and right directions of said engine;
- an intake of said coolant supply pipe is connected to an intersection point of said left and right depression extensions;
- and
- outlets of coolant from said coolant jackets of said left and right banks are provided in rear portions of said depression extensions, opposite to said intersection point.
5 more elements
Dependencies are inferred from the claim text.