Patent Number: 6,332,435

Title: Crank journal support portion structure of a horizontal opposed type engine

Abstract: The invention minimizes the problem of deterioration in engine strength by concentration of stress due to the combustion load in a hole portion provided on a crank journal support wall in a crank case and reduces pumping loss. Further, the invention discharges blow-by gas smoothly, while reducing the engine weight. There is provided a crank journal support portion structure disposed in a crank case of a horizontal opposed type engine, wherein a hole portion communicating with an adjacent cylinder is opened at rotation angular positions of a crank journal yielding small stress generated at a crank journal support wall portion by transmitting combustion load to the crank journal via a piston connecting rod, in the vicinity of the crank journal support hole of the crank journal support wall portion disposed between respective cylinders.

Inventors: Kaita; Keiji (Susono, JP)

Assignee: Toyota Jidosha Kabushiki Kaisha

International Classification: F02B 75/24 (20060101); F02B 75/00 (20060101); F02B 75/18 (20060101); F16H 021/18 ()

Expiration Date: 12/25/2018