Hinge assembly for trunk lid of vehicle

1. A hinge assembly for a trunk lid of a vehicle, comprising:

a hinge arm ( 110 ) configured to be coupled to the trunk lid (T);

a hinge bracket ( 120 ) configured to be coupled to a vehicle body and having a hinge shaft ( 121 ), the hinge arm ( 110 ) being rotatably coupled to the hinge bracket ( 120 );

a torsion bar ( 130 ) configured to be coupled to the hinge arm ( 110 ) and to provide an elastic force to the hinge arm ( 110 ) in an opening direction; and

a cushion assembly ( 140 ) provided at one end of the hinge arm ( 110 ) adjacent to the hinge shaft ( 121 ) and configured to adjust a rotation speed of the hinge arm ( 110 ) in response to the elastic force of the torsion bar ( 130 ),

wherein the cushion assembly ( 140 ) comprises:

a pin holder ( 142 ) provided with a guide groove ( 142 a ) at an upper end thereof and arranged to be movable vertically inside the hinge arm ( 110 );

a roller assembly ( 141 ) spaced downward from the guide groove ( 142 a ) by a predetermined distance and configured to be coupled to the pin holder ( 142 );

a spring holder ( 144 ) arranged spaced downward from the pin holder ( 142 ) by a predetermined distance and configured to be fixedly installed inside the hinge arm ( 110 ); and

a damping spring ( 143 ) configured to elastically support between the pin holder ( 142 ) and the spring holder ( 144 ),

wherein the guide groove ( 142 a ) is formed to extend a predetermined length downward from the upper end of the pin holder ( 142 ), is coupled to the hinge shaft ( 121 ), and is formed to guide a vertical movement of the pin holder ( 142 ) by the hinge shaft ( 121 ),

wherein the cushion assembly ( 140 ) further comprises a guide pin ( 145 ) arranged to pass through a center of the damping spring ( 143 ), an upper end of the guide pin ( 145 ) being coupled to the pin holder ( 142 ) and a lower end thereof being coupled to the spring holder ( 144 ) so as to be slidingly movable vertically, and

wherein the spring holder ( 144 ) has a guide pin retaining hole ( 144 c ) formed to extend vertically for the lower end of the guide pin ( 145 ) to be retained thereto.

2. The hinge assembly for a trunk lid of a vehicle according to claim 1 , wherein the hinge bracket ( 120 ) has a guide profile ( 122 ) configured to be elastically contacted and supported by the cushion assembly ( 140 ) according to opening and closing of the trunk lid (T),

wherein the guide profile ( 122 ) has a predetermined width so as to make surface contact with the roller assembly ( 141 ) and is formed to extend along a lower surface of the hinge bracket ( 120 ), and

wherein the roller assembly ( 141 ) comprises:

a shaft ( 141 a ) fixedly coupled to the pin holder ( 142 ); and

a roller ( 141 b ) rotatably coupled to each end of the shaft ( 141 a ), configured to make contact with and roll on the guide profile ( 122 ), and comprising an elastic material in part or entirely.

3. The hinge assembly for a trunk lid of a vehicle according to claim 2 , further comprising:

an auxiliary spring ( 150 ) spaced from the hinge shaft ( 121 ) by a predetermined distance to thereby be fastened between the hinge bracket ( 120 ) and the hinge arm ( 110 ), the auxiliary spring ( 150 ) comprising a tension coil spring arranged to be exposed to the outside of the hinge bracket ( 120 ) and the hinge arm ( 110 ) and configured to apply a predetermined elastic force in an opposite direction when the hinge arm ( 110 ) rotates in an opening direction,

wherein the guide profile ( 122 ) is formed to be spaced from the hinge shaft ( 121 ) by a first radius (R 1 ) at a point corresponding to a closed position of the trunk lid (T), and is formed to be spaced from the hinge shaft ( 121 ) by a third radius (R 3 ) at a point corresponding to an opened position of the trunk lid (T), and

wherein the third radius (R 3 ) is formed to be larger than the first radius (R 1 ) by a predetermined amount.