Stiffness improvement structure of vehicle

A stiffness improvement structure of a vehicle, which reinforces stiffness of the vehicle by being provided in a vehicle body including a transverse frame formed in a width direction of the vehicle and a longitudinal frame formed in a longitudinal direction of the vehicle, the stiffness improvement structure comprising:

• a plurality of transverse reinforcement frames formed in parallel to the transverse frame and provided with an interval from each other in the longitudinal direction of the vehicle;
• and
• a plurality of longitudinal reinforcement frames formed in parallel to the longitudinal frame and provided with an interval from each other in the width direction of the vehicle,
• wherein a front end portion and a rear end portion of each of the longitudinal reinforcement frames are bonded to the transverse frame and the transverse reinforcement frames or bonded to the transverse reinforcement frames spaced from each other,
• wherein a connection frame coupled to an articulated plate for connecting the body to another body is provided in the transverse frame, and
• wherein the end portions of the longitudinal reinforcement frames, which are engaged with the transverse frame, are bonded at a portion engaged with the connection frame in the transverse frame,
• wherein the transverse reinforcement frame includes:
• a first transverse reinforcement frame of the plurality of transverse reinforcement frames spaced from the transverse frame;
• and
• a second transverse reinforcement frame of the plurality of transverse reinforcement frames spaced from the first transverse reinforcement frame toward a rear side of the vehicle,
• wherein the longitudinal reinforcement frame includes:
• an internal longitudinal reinforcement frame provided adjacent to a center portion of the transverse frame in the width direction;
• and
• an external longitudinal reinforcement frame provided toward an external side of the vehicle from the internal longitudinal reinforcement frame,
• wherein the external longitudinal reinforcement frame includes:
• a first external longitudinal reinforcement frame of which the front end portion is bonded to the transverse frame and of which the rear end portion is bonded to the first transverse reinforcement frame;
• and
• a second external longitudinal reinforcement frame of which the front end portion is bonded to the first transverse reinforcement frame and of which the rear end portion is bonded to the second transverse reinforcement frame,
• wherein the stiffness improvement structure further includes;
• a reinforcement member provided on a portion in which the first external longitudinal reinforcement frame is bonded to the first transverse reinforcement frame to distribute stress at the portion, and
• a first patch member provided on a portion in which the second external longitudinal reinforcement frame is bonded to the second transverse reinforcement frame, to reinforce bonding stiffness of the portion,
• wherein a length of the reinforcement member is longer than a length of the first patch member.