Water-cooled internal combustion engine

Claim 1

An internal combustion engine comprising: (a) a crankcase defining therein an oil reservoir and a pump receptacle separate from said oil reservoir, said crankcase having a side wall defining one exterior surface; (b) a crankshaft journaled in said crankcase for rotation about a first axis and carrying a crank in said reservoir; (c) a cylinder fixedly mounted on said crankcase and formed with a cooling jacket, said cylinder and said crankcase being formed with respective, communicating bores connecting said pump receptacle to said jacket; (d) a pump assembly located in said pump receptacle including a pump shaft secured to said crankcase for rotation about a second axis spaced laterally from and parallel to said first axis, and an impeller mounted on said pump shaft; (e) drive train means for transmitting the output of said engine to a driven wheel and including a motion transmitting member fixedly mounted on said crankshaft outside said crankcase adjacent to the exterior surface of said side wall of said crankcase; and (f) a first gear on said crankshaft and a second spur gear mounted on said pump shaft and said first and second spur gear disposed in meshing engagement with each other for turning said pump shaft in response to rotation of said crankshaft, said first spur gear on said crankshaft adjacent to said motion transmitting member in the direction of said first axis said second spur gear located outside said crankcase, said receptacle extending through said side wall into said crankcase and being sealed from said oil reservoir and being accessible only from the exterior of said side wall of said crankcase.