Transmission for self-propelled walking lawn mowers

A transmission for self-propelled walking lawn mowers comprising:

• a casing having an inner wall with an opening;
• an input shaft having a lower end, inserted into the opening formed in the casing, said lower end having a lower end face;
• an output shaft disposed perpendicular to the axis of the input shaft;
• a drive gear mounted on the input shaft;
• a drive gear mounted on the output shaft;
• a power transmission gear mechanism for transmitting drive power from the input shaft to the output shaft via the drive gear on the input shaft and the drive gear on the output shaft;
• and
• bearing structures for supporting the input shaft, said bearing structures comprising:
• an upper bearing structure disposed adjacent to and above the drive gear mounted on the input shaft;
• and
• a lower supporting structure disposed adjacent to and below the lower end of the input shaft, said lower supporting structure comprising a supporting member which projects from the inner wall of the casing to a position adjacent to and below the lower end of the input shaft, said supporting member having an upper face, wherein the lower-end face of the input shaft and the upper face of the supporting member are engaged to hold the input shaft at its horizontal position.