Vehicle body frame of utility vehicle

1. A vehicle body frame of a utility vehicle comprising:

a main frame supporting an engine;

a front frame supporting parts of an operating system for operation of the utility vehicle;

a front seat frame supporting a front seat;

a rear seat frame supporting a rear seat;

a carrier frame supporting a cargo bed arranged at a rear of the utility vehicle;

a first side frame attached to a left side of the main frame with a first coupling member;

a second side frame attached to a right side of the main frame with a second coupling member;

a first door hinge frame supporting a first side door; and

a second door hinge frame supporting a second side door;

wherein:

the front frame, the front seat frame, the rear seat frame, and the carrier frame are attached to the main frame,

the first door hinge frame is arranged at the left side of the main frame, a bottom of the first door hinge frame is connected to the first side frame, and a top of the first door hinge frame is connected to the front seat frame,

the second door hinge frame is arranged at the right side of the main frame, a bottom of the second door hinge frame is connected to the second side frame and a top of the second door hinge frame is connected to the front seat frame, and

each of the front frame, the front seat frame, and the carrier frame is wider than the main frame in a lateral direction of the utility vehicle.

2. The vehicle body frame of the utility vehicle according to claim 1 ,

further comprising a partial frame attached to the main frame with a third coupling member.

3. The vehicle body frame of the utility vehicle according to claim 2 ,

wherein a distance between a left wheel of the utility vehicle and a right wheel of the utility vehicle is greater than a width of the main frame in the lateral direction of the utility vehicle.

4. The vehicle body frame of the utility vehicle according to claim 2 ,

wherein at least one of the first coupling member, the second coupling member and the third coupling member comprises a bolt and a nut.

5. The vehicle body frame of the utility vehicle according to claim 4 ,

wherein the main frame has a steel stock which is a channel steel or a square steel, and has a tubular member which is fixed to the steel stock by welding and is configured to receive at least one of the bolt of the first coupling member, the bolt of the second coupling member and the bolt of the third coupling member.

6. The vehicle body frame of the utility vehicle according to claim 5 ,

wherein the main frame and one of the first side frame and the second side frame are fixed together so that an end of the one of the first side frame and the second side frame reaches a side surface of the steel stock of the main frame, and

wherein an L-shaped bracket for receiving the side surface is fixed to the end of the one of the first side frame and the second side frame.