An engine bracket including: an attachment portion provided in a fixing location adapted to be fixed to at least one of the vehicle body and power unit; a bolt hole being formed in the attachment portion so that the attachment portion is fixed to the vehicle body or power unit by a fixing bolt inserted into the bolt hole; and at lease one breaking groove formed at an area located spaced away from the bolt hole so as to extend away from the bolt hole and toward an outer peripheral edge of the attachment portion on at least one of opposite surfaces of the attachment portion in a direction in which the fixing bolt is inserted.
1. An engine bracket that is installed between a vehicle body and a power unit for the vibration damping support of the power unit relative to the vehicle body, the engine bracket comprises:
an attachment portion provided in a fixing location adapted to be fixed to at least one of the vehicle body and power unit;
a bolt hole being formed in the attachment portion so that the attachment portion is fixed to the vehicle body or power unit by a fixing bolt inserted into the bolt hole; and
at least one breaking groove formed at an area located spaced away from the bolt hole so as to extend away from the bolt hole and toward an outer peripheral edge of the attachment portion on at least one of opposite surfaces of the attachment portion in a direction in which the fixing bolt is inserted.
2. The engine bracket according to claim 1 , wherein the breaking groove is formed in a region outside an outer peripheral side of a surface subject to a tightening force of the fixing bolt in the attachment portion.
3. The engine bracket according to claim 1 , wherein one end of the breaking groove on a bolt hole side is formed in a surface subject to a tightening force of the fixing bolt in the attachment portion.
4. The engine bracket according to claim 1 , wherein the attachment portion includes a fitting recess formed in a surface on which is superposed a fixing member of the power unit or vehicle body in a direction in which the fixing bolt is inserted in the attachment portion for preventing the fixing member from rotating around the fixing bolt, and the breaking groove is formed in a region to an outside of the fitting recess.
5. The engine bracket according to claim 1 , wherein a first direction in which a load acts on the fixing bolt during vehicle collisions and a second direction in which the breaking groove extends are at an angle θ of 20°≦θ≦60°.
6. The engine bracket according to claim 1 , wherein the at least one breaking groove comprises a plurality of breaking grooves.
7. The engine bracket according to claim 1 , wherein the at least one breaking grooves comprise two breaking grooves, and the two breaking grooves are slant with respect to a first direction in which the load acts on the fixing bolt during vehicle collisions with a same angle.
8. The engine bracket according to claim 1 , wherein the attachment portion is of panel shape that expands horizontally, and the bolt hole is formed vertically through the attachment portion.
9. The engine bracket according to claim 1 , further comprising: a main panel portion extending in a longitudinal direction of the vehicle, wherein the attachment portion is formed integrally at one end of the main panel portion in the longitudinal direction of the vehicle, one of the power unit and vehicle body being fixable thereto, and a fixing panel portion that expands in a lateral direction of the vehicle at right angles to the main panel portion is formed integrally with the other end of the main panel portion in the longitudinal direction of the vehicle, an other of the power unit and vehicle body being fixable thereto.
10. The engine bracket according to claim 9 , further comprising a reinforcing panel portion integrally formed with the main panel portion and fixing panel portion, and extending perpendicularly to both of the main panel portion and fixing panel portion.
11. An engine bracket for connecting a power unit to a body of an automotive vehicle via an engine mount, comprising:
a main panel portion extending in a longitudinal direction of the vehicle, and having an attachment portion formed at a rear end of the main panel portion in the longitudinal direction of the vehicle, the attachment portion having a bolt hole extending orthogonal to the longitudinal direction of the vehicle, and being fixable to the body of the vehicle by a fixing bolt inserted into the bolt hole;
a fixing panel portion that expands in a lateral direction of the vehicle at right angles to the main panel portion is formed integrally with a front end of the main panel portion in the longitudinal direction of the vehicle, and being fixable to the power unit; and
a pair of breaking grooves formed at an area located spaced away from the bolt hole so as to extend in respective radially outward directions of the bolt hole to an outer peripheral edge of the rear end of the main panel portion in the longitudinal direction of the vehicle, the respective radially outward directions are at an angle θ of 20°≦θ≦60° with respect to the longitudinal direction of the vehicle in which a load acts on the fixing bolt during vehicle collisions.
12. The engine bracket according to claim 1 , wherein an end on an inner peripheral side of the breaking guide groove is formed farther on a radial outside than the bolt hole with a radial gap therebetween.
13. The engine bracket according to claim 11 , wherein an end on an inner peripheral side of each breaking guide groove is formed farther on a radial outside than the bolt hole with a radial gap therebetween.