Abstract: Disclosed is a self-balancing device for self-propelled off-road RV box body. The self-balancing device includes an auxiliary beam body for connecting with a bottom end of the RV box body, a front triangular balance beam body, a rear triangular balance beam body and an axle-holding device for connecting with a RV chassis girder. The front triangular balance beam body and the rear triangular balance beam body are arranged close to both ends of the auxiliary beam body respectively. The axle-holding device is arranged between the front triangular balance beam body and the rear triangular balance beam body. Both the front triangular balance beam body and the rear triangular balance beam body include a hard limit structure for limiting a swing angle of the RV box body. The axle-holding device includes a soft limit structure for horizontally resetting the RV box body.

Abstract: Disclosed is an automobile chassis, which includes a chassis main beam, a chassis cross beam and a support cross beam. The quantity of the chassis main beams is two. The two chassis main beams are arranged in parallel. A section shape of the chassis main beam is “”, and the openings of the two chassis main beams are arranged opposite. The quantity of the support cross beams is more than one. All the support cross beams are arranged between the two chassis main beams. A length direction of the support cross beam is perpendicular to a length direction of the chassis main beam. The chassis cross beam is arranged at an end of the chassis main beam, and both ends of the chassis cross beam are respectively connected and fixed with the two chassis main beams.

Abstract: An electric sofa for recreational vehicle is provided with a sofa combined cabinet. The sofa combined cabinet includes a first sofa cabinet, a second sofa cabinet and a third sofa cabinet. The sofa combined cabinet is of U-shaped distribution. The third sofa cabinet is provided with a telescopic plate, the telescopic plate is located at one side of the third sofa cabinet close to the second sofa cabinet, the telescopic plate is provided with a telescopic plate driving device fixed on the floor of the recreational vehicle. The third sofa cabinet is provided with a sofa cabinet driving device. The bottom of the third sofa cabinet is provided with a slide rail device, the telescopic plate is unfolded or contracted under the driving of the telescopic plate driving device, the third sofa cabinet is driven by the sofa cabinet driving device to move along the slide rail device.

Abstract: A ball joint tractor with simple structure and convenient operation is disclosed. When docking is required, it will realize automatic locking, and there is no need for separate personnel to operate. Docking can be completed without getting off the vehicle. The pull ring spring plunger used in the disclosure can be directly inserted into the tractor from the outside of the tractor. When the pull ring spring plunger is damaged, it can be replaced directly without replacing the whole ball joint tractor, which improves the service efficiency of the equipment and avoids the failure of the whole ball joint tractor due to poor spring pin. In the disclosure, by placing the fixing ball in the ball joint groove for locking, the risk of automatic unlocking is avoided, and the safety performance is high and the traction effect is good.

Abstract: Disclosed is a self-balancing device for self-propelled off-road RV box body. The self-balancing device includes an auxiliary beam body for connecting with a bottom end of the RV box body, a front triangular balance beam body, a rear triangular balance beam body and an axle-holding device for connecting with a RV chassis girder. The front triangular balance beam body and the rear triangular balance beam body are arranged close to both ends of the auxiliary beam body respectively. The axle-holding device is arranged between the front triangular balance beam body and the rear triangular balance beam body. Both the front triangular balance beam body and the rear triangular balance beam body include a hard limit structure for limiting a swing angle of the RV box body. The axle-holding device includes a soft limit structure for horizontally resetting the RV box body.