Reverse tricycle support structure

A reverse tricycle support structure comprising a frame, a front two-wheel fixing bracket and a rear flat fork, wherein the frame comprises a frame rear section, a frame middle section and a frame front section, the frame front section is fixedly connected to the front two-wheel fixing bracket, the frame rear section is movably connected to the rear flat fork, the front two-wheel fixing bracket is fixed on two front wheels, an upper end of a rear center single shock absorption member is hingedly fixed on the frame, and a lower end of the rear center single shock absorption member is hingedly fixed on the rear flat fork, characterized in that the reverse tricycle support structure further comprises a parking lock device, the parking lock device controls left and right swing of the front two-wheel fixing bracket;

• the frame rear section comprises a left rear upper horizontal pipe, a left rear inclined rear standpipe, a right rear upper horizontal pipe, and a right rear inclined rear standpipe;
• the frame middle section comprises a left middle upper horizontal pipe, a left middle inclined rear standpipe, a left middle lower horizontal pipe, a left middle inclined front standpipe, a right middle upper horizontal pipe, a right middle inclined rear standpipe, a right middle lower horizontal pipe, and a right middle inclined front standpipe;
• the frame front section comprises a left front inclined standpipe, a left front horizontal pipe, a right front inclined standpipe, and a right front horizontal pipe;
• wherein the left rear upper horizontal pipe is smoothly connected to the left rear inclined rear standpipe, to the left middle upper horizontal pipe, to the left front inclined standpipe and to the left front horizontal pipe, a front end of the left middle lower horizontal pipe is connected with a rear end of the left middle inclined front standpipe, a rear end of the left middle lower horizontal pipe is connected with a front end of the left middle inclined rear standpipe, a front end of the left middle inclined front standpipe is connected with the left front inclined standpipe, and a rear end of the left middle inclined rear standpipe is connected with the left middle upper horizontal pipe;
• the right rear upper horizontal pipe is smoothly connected to the right rear inclined rear standpipe, to the right middle upper horizontal pipe, to the right front inclined standpipe and to the right front horizontal pipe, a front end of the right middle lower horizontal pipe is connected with a rear end of the right middle inclined front standpipe, a rear end of the right middle lower horizontal pipe is connected with a front end of the right middle inclined rear standpipe, a front end of the right middle inclined front standpipe is connected with the right front inclined standpipe, and a rear end of the right middle inclined rear standpipe is connected with the right middle upper horizontal pipe;
• a parallel bracket formed by the left rear upper horizontal pipe, the left rear inclined rear standpipe, the right rear upper horizontal pipe and the right rear inclined rear standpipe is connected with an upper connecting piece of the rear center single shock absorption member, a lower connecting piece of the rear center single shock absorption member is arranged on the rear flat fork, and the rear flat fork is movably connected between the left middle upper horizontal pipe and the right middle upper horizontal pipe;
• a directional riser fixing holder is fixedly connected between a parallel bracket formed by the left front horizontal pipe, the left front inclined standpipe, the right front horizontal pipe and the right front inclined standpipe, and a riser is fixedly connected to the directional riser fixing holder;
• the front two-wheel fixing bracket comprises a left fixing seat and a right fixing seat, the left fixing seat is fixed on a wheel hub of a left front wheel, the right fixing seat is fixed on a wheel hub of a right front wheel;
• the front two-wheel fixing bracket further comprises a front suspension and a support arms assembly, the front suspension comprises a cavity for centrally mounting a horizontal front shock absorption member, a front upper cavity provided at a front upper portion, a front lower cavity provided at a front lower portion, and a rear lower cavity provided at a rear lower portion;
• a left limit block is disposed on a left side between the front upper cavity and the front lower cavity of the front suspension, and a right limit block is disposed on a right side between the front upper cavity and the front lower cavity;
• the support arms assembly comprises an upper left support arm, an upper right support arm, a lower left support arm front arm, a lower right support arm front arm, a lower left support arm rear arm, and a lower right support arm rear arm, wherein an inner end of the upper left support arm and an inner end of the upper right support arm are hingedly connected and mounted within the front upper cavity via a first pin shaft;
• an inner end of the lower left support arm front arm and an inner end of the lower right support arm front arm are hingedly connected and mounted within the front lower cavity via a second pin shaft;
• an inner end of the lower left support arm rear arm and an inner end of the lower right support arm rear arm are hingedly connected and mounted within the rear lower cavity via a third pin shaft;
• the upper left support arm is disposed at an upper portion of the left limit block, the lower left support arm front arm is disposed at a lower portion of the left limit block, the upper right support arm is disposed at an upper portion of the right limit block, and the lower right support arm front arm is disposed at a lower portion of the right limit block;
• outer ends of the upper left support arm, the lower left support arm front arm, and the lower left support arm rear arm are hingedly connected to the left fixing seat;
• outer ends of the upper right support arm, the lower right support arm front arm, and the lower right support arm rear arm are hingedly connected to the right fixing seat;
• a front shock absorption member left connecting piece is disposed between the lower left support arm front arm and the lower left support arm rear arm, and a front shock absorption member right connecting piece is disposed between the lower right support arm front arm and the lower right support arm rear arm;
• a left side of the front shock absorption member is connected to the front shock absorption member left connecting piece, and aright side of the front shock absorption member is connected to the front shock absorption member right connecting piece.