The invention relates to the technical field of design of vehicle frames of motor tricycles, in particular to a connecting method of a vehicle head stand
pipe, a main beam and a
keel horizontal beam and a
vehicle frame and solves the technical problems that connecting structures of vehicle head stand pipes, main beams and
keel horizontal beams are high in
welding workload and hardly tolerate
heavy load in the prior art. The connecting method includes the steps that a similarly triangular right
prism connecting piece (1) is fabricated, the main beam and the vehicle head stand
pipe are firmly welded, the
keel horizontal beam and the main beam are firmly welded, and
welding of the keel horizontal beam and the main beam is reinforced through a first connecting piece (a) and a second connecting piece (b). According to the connecting method of the vehicle head stand
pipe, the main beam and the keel horizontal beam and the
vehicle frame, fastened connection between the keel horizontal beam and the main beam can be achieved through self fabrication of the similarly triangular right
prism connecting piece, connecting bear load of the stand pipe can be reduced, the length of
welding seams that act on the stand pipe can be reduced, and technical effects of avoiding passive
thermal treatment or
thermal deformation of the stand pipe can be achieved. Besides, by means of the connecting method of the vehicle head stand pipe, the main beam and the keel horizontal beam and the
vehicle frame, technical effects of small deformation quantity when the vehicle frame of a motor tricycle carries
heavy load, firm connection of welding positions and difficulty
cracking can be achieved.