Powertrain mount structure of vehicle

A powertrain mount structure of a vehicle comprising:

• a powertrain-side mount bracket including a leg member and a single extension portion, the leg member comprising a front-side leg portion and a rear-side leg portion which are spaced apart from each other in a vehicle longitudinal direction and respectively fixed to a powertrain, the single extension portion being provided to extend outward in a vehicle width direction from an upper end of the leg member;
• a mount rubber attached to the single extension portion of the powertrain-side mount bracket;
• and
• a vehicle-body-side mount bracket provided to be connected to the powertrain-side mount bracket via the mount rubber and fixed to a vehicle body, wherein
• said powertrain-side mount bracket includes
• a connection portion, which connects said front-side leg portion and said rear-side leg portion;
• a middle fixation portion, which is provided at said connection portion at a position located between the front-side leg portion and the rear-side leg portion and includes an attaching hole configured to be fixed to the powertrain;
• and
• a rigidity-reduction portion, which has a rigidity against a load applied in the vehicle width direction that is lower than that of the front-side leg portion and the rear-side leg portion and is provided at a position located in a vicinity of said middle fixation portion,
• said rigidity-reduction portion of the powertrain-side mount bracket includes an opening portion which is formed at a position located above said connection portion and between said front-side leg portion and said rear-side leg portion,
• in said rigidity-reduction portion of the powertrain-side mount bracket, said middle fixation portion is positioned inward, toward an interior of the vehicle body in the vehicle width direction, relative to a fixation position of said front-side leg portion and said rear-side leg portion fixed to the powertrain,
• said opening portion is located directly above the attaching hole of the middle fixation portion in a direction perpendicular to each of the vehicle width direction and the vehicle longitudinal direction,
• said powertrain-side mount bracket includes a vertical wall portion, which is formed between said front-side leg portion and said rear-side leg portion, and said rigidity-reduction portion of the powertrain-side mount bracket includes a lightening hole portion which is formed inside said vertical wall portion, and
• said powertrain-side mount bracket includes a rib which is provided at the vertical wall portion in an area where said lightening hole portion is formed such that the rib is bridged inside the lightening hole portion.