Patent ID: 8176890
Filing Date: 2012-05-15
Classification: F01M

Abstract:
1. An engine oil pan structure comprising: a lower case having a pair of side walls each extending in a longitudinal direction of a crank shaft and a plurality of bearing cap sections for connection between the side walls, said lower case provided under a cylinder block; a balancer device having a balancer shaft provided under the lower case, said balancer device mounted on a mounting section formed at positions of the bearing cap sections adjoining the side walls respectively; and an oil pan covering the balancer device, said oil pan joined to lower end portions of the side walls; wherein said oil pan has a deep bottom portion and a shallow bottom portion whose depth is shallower than that of said deep bottom portion; said mounting section is provided inside of said shallow bottom portion; and a reinforcing rib which surrounds said balancer device in a horseshoe shape and whose two end portions are joined to portions of a flange section for joining the oil pan to the side walls adjoining the mounting section is provided on an external surface of said shallow bottom portion.