A water-cooled V-type engine includes a first coolant passage for supplying a liquid coolant discharged from a water pump disposed proximate a first cylinder, to a water jacket of the first cylinder. The engine also includes a second coolant passage which is branched off from the first coolant passa
A water-cooled V-type engine includes a first coolant passage for supplying a liquid coolant discharged from a water pump disposed proximate a first cylinder, to a water jacket of the first cylinder. The engine also includes a second coolant passage which is branched off from the first coolant passage, and which is provided for supplying coolant to a water jacket of a second cylinder. The engine design allows for a shortened coolant hose. The water pump may include an integral fluid conduit including a branching portion where said second coolant supply passage is branched from said first coolant supply passage, and a restricted portion proximate the branching portion. A motorcycle including a vehicle body frame is also described, where the water-cooled V-type engine is operatively attached to the vehicle body frame.
대표청구항▼
1. A water-cooled V-type engine, comprising: first and second cylinders arranged so as to form a V-shape, said first cylinder comprising a first cylinder block having a first block water jacket formed therein and a first cylinder head attached to said first cylinder block and having a first cylinder
1. A water-cooled V-type engine, comprising: first and second cylinders arranged so as to form a V-shape, said first cylinder comprising a first cylinder block having a first block water jacket formed therein and a first cylinder head attached to said first cylinder block and having a first cylinder head water jacket formed therein in fluid communication with the first block water jacket;said second cylinder comprising a second cylinder block having a second block water jacket formed therein and a second cylinder head attached to said second cylinder block and having a second cylinder head water jacket formed therein in fluid communication with the second block water jacket;a water pump for transferring coolant from a radiator to the water jackets of said first and second cylinders, said water pump situated proximate said first cylinder;wherein said engine further includes a first coolant supply passage for supplying coolant from said water pump to the first cylinder head water jacket, and a second coolant supply passage which is branched from said first coolant supply passage for supplying coolant to said second cylinder head water jacket;a first discharge opening formed in the first cylinder block for discharging coolant that has first cooled said first cylinder head and has then cooled said first cylinder block;a second discharge opening formed in the second cylinder block for discharging coolant that has first cooled said second cylinder head and has then cooled said second cylinder block; anda discharge pipe extending between the first and second cylinder blocks, said discharge pipe having a coolant return passage formed therein for routing coolant from said first and second discharge openings toward said radiator. 2. The water-cooled V-type engine according to claim 1, wherein said water pump is mounted on said first cylinder head and driven by a camshaft. 3. The water-cooled V-type engine according to of claim 1, further comprising a fluid conduit comprising a branching portion where said second coolant supply passage is branched from said first coolant supply passage, and a restricted portion proximate said branching portion. 4. The water-cooled V-type engine according to claim 3, wherein said fluid conduit is formed integrally with a pump body of said water pump. 5. The water-cooled V-type engine according to claim 1, wherein said water pump has a plurality of bolt holes formed therein for receiving mounting bolts, and wherein one of said bolt holes is in fluid communication with an inside space of said water pump, so that said bolt hole also serves as an air bleed hole. 6. The water-cooled V-type engine according to claim 1, wherein said water pump is mounted on a mounting surface of said first cylinder, and wherein a cam angle sensor for sensing a rotary position of a camshaft is also mounted on the mounting surface of said first cylinder. 7. The water-cooled V-type engine according to claim 1, further comprising: a coolant routing duct connected to an upper portion of said radiator for conveying coolant from said radiator toward said water pump;a connection pipe communicating with said coolant routing duct; anda pressure valve and an air bleeding mechanism both provided at an upper end of said connection pipe. 8. The water-cooled V-type engine according to claim 7, wherein: the radiator includes a radiator core and right and left tank portions respectively provided on right and left sides of said radiator core;said coolant routing duct is connected to an upper portion of one of said right and left tank portions; anda coolant discharge hose for supplying coolant from said engine to said radiator is operatively connected to a lower portion of the same tank portion to which said coolant routing duct is connected. 9. The water-cooled V-type engine according to claim 7, wherein: the radiator is located on the front side of said water-cooled V-type engine;said first cylinder is a forward-tilted cylinder such that said cylinder head is located at a front upper portion of said water-cooled V-type engine; andwater outlets of said radiator and said water pump are arranged in tandem as viewed in side elevation. 10. A motorcycle comprising a vehicle body frame and a V-type engine operatively attached to said vehicle body frame, said engine comprising: first and second cylinders arranged so as to form a V-shape, said first cylinder comprising a first cylinder block having a first block water jacket formed therein and a first cylinder head attached to said first cylinder block and having a first cylinder head water jacket formed therein in fluid communication with the first block water jacket;said second cylinder comprising a second cylinder block having a second block water jacket formed therein and a second cylinder head attached to said second cylinder block and having a second cylinder head water jacket formed therein in fluid communication with the second block water jacket;a water pump for transferring coolant from a radiator to the water jackets of said first and second cylinders, said water pump situated proximate said first cylinder;wherein said engine further includes a first coolant supply passage for supplying coolant from said water pump to the first cylinder head water jacket, and a second coolant supply passage which is branched from said first coolant supply passage for supplying coolant to said second cylinder head water jacket;a first discharge opening formed in the first cylinder block for discharging coolant that has first cooled said first cylinder head and has then cooled said first cylinder block;a second discharge opening formed in the second cylinder block for discharging coolant that has first cooled said second cylinder head and has then cooled said second cylinder block; anda discharge pipe extending between the first and second cylinder blocks, said discharge pipe having a coolant return passage formed therein for routing coolant from said first and second discharge openings toward said radiator. 11. The motorcycle according to claim 10, wherein said water pump is mounted on said first cylinder head and driven by a camshaft. 12. The motorcycle according to claim 10, further comprising a fluid conduit comprising a branching portion where said second coolant supply passage is branched from said first coolant supply passage, and a restricted portion proximate said branching portion. 13. The motorcycle according to claim 12, wherein said fluid conduit is formed integrally with a pump body of said water pump. 14. The motorcycle according to claim 10, wherein said water pump has a plurality of bolt holes formed therein for receiving mounting bolts, and wherein one of said bolt holes is in fluid communication with an inside space of said water pump, so that said bolt hole also serves as an air bleed hole. 15. The motorcycle according to claim 10, wherein said water pump is mounted on a mounting surface of said first cylinder, and wherein a cam angle sensor for sensing a rotary position of a camshaft is also mounted on the mounting surface of said first cylinder. 16. The motorcycle according to claim 10, further comprising: a coolant routing duct connected to an upper portion of said radiator for conveying coolant from said radiator toward said water pump;a connection pipe communicating with said coolant routing duct; anda pressure valve and an air bleeding mechanism both provided at an upper end of said connection pipe. 17. The motorcycle according to claim 16, wherein: the radiator includes a radiator core and right and left tank portions respectively provided on right and left sides of said radiator core;said coolant routing duct is connected to an upper portion of one of said right and left tank portions; anda coolant discharge hose for supplying coolant from said engine to said radiator is operatively connected to a lower portion of the same tank portion to which said coolant routing duct is connected. 18. The motorcycle according to claim 16, wherein: the radiator is located on the front side of said water-cooled V-type engine;said first cylinder is a forward-tilted cylinder such that said cylinder head is located at a front upper portion of said water-cooled V-type engine; andwater outlets of said radiator and said water pump are arranged in tandem as viewed in side elevation. 19. A water-cooled V-type engine, comprising: first and second cylinders arranged so as to form a V-shape, said first cylinder comprising a first cylinder block having a first block water jacket formed therein and a first cylinder head attached to said first cylinder block and having a first cylinder head water jacket formed therein in fluid communication with the first block water jacket;said second cylinder comprising a second cylinder block having a second block water jacket formed therein and a second cylinder head attached to said second cylinder block and having a second cylinder head water jacket formed therein in fluid communication with the second block water jacket;a water pump for transferring coolant from a radiator to the water jackets of said first and second cylinders, said water pump situated proximate said first cylinder;wherein said engine further includes a first coolant supply passage for supplying coolant from said water pump to the first cylinder head water jacket, and a second coolant supply passage which is branched from said first coolant supply passage for supplying coolant to said second cylinder head water jacket;a coolant routing duct connected to an upper portion of said radiator for conveying coolant from said radiator toward said water pump;a connection pipe communicating with said coolant routing duct; anda pressure valve and an air bleeding mechanism both provided at an upper end of said connection pipe. 20. A motorcycle comprising a vehicle body frame and a V-type engine operatively attached to said vehicle body frame comprising: first and second cylinders arranged so as to form a V-shape, said first cylinder comprising a first cylinder block having a first block water jacket formed therein and a first cylinder head attached to said first cylinder block and having a first cylinder head water jacket formed therein in fluid communication with the first block water jacket;said second cylinder comprising a second cylinder block having a second block water jacket formed therein and a second cylinder head attached to said second cylinder block and having a second cylinder head water jacket formed therein in fluid communication with the second block water jacket;a water pump for transferring coolant from a radiator to the water jackets of said first and second cylinders, said water pump situated proximate said first cylinder;wherein said engine further includes a first coolant supply passage for supplying coolant from said water pump to the first cylinder head water jacket, and a second coolant supply passage which is branched from said first coolant supply passage for supplying coolant to said second cylinder head water jacket;a coolant routing duct connected to an upper portion of said radiator for conveying coolant from said radiator toward said water pump;a connection pipe communicating with said coolant routing duct; anda pressure valve and an air bleeding mechanism both provided at an upper end of said connection pipe.
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이 특허에 인용된 특허 (10)
Koinuma Yutaka (Tokyo JPX), Coolant passage system for V-shaped internal combustion engine.
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