Torsional foldable tricycle

Abstract

The invention discloses a torsional foldable tricycle. A front hinge and a back hinge are arranged on a side rod of a chassis provided with two side rods; the back end of the chassis is hinged to the front end, on which a rear wheel is arranged, of a rear wheel frame through a middle axle; a connecting rod hinged to a rear hinge base of the chassis is connected with the rear wheel frame through a spring cotter; a transverse rod of a front wheel frame is arranged on a front hinge base; upward warping end shafts at the two ends of the transverse rod are hinged to a front wheel support leg; a front wheel steering shaft and front wheels are arranged on a steering bearing casing on the outer side of the front wheel support leg; a rotating bracket capable of rotating about the axle center of the transverse rod is connected with the front wheel support leg and the front end of a seat; the back portion of the seat is connected to the connecting rod; a driving device consisting of three stages of transmission chains is arranged on the chassis and the rear wheel frame; the chassis and the rear wheel frame can be twisted from a vertical state to a horizontal state relative to the front wheel frame and the seat, and the rear wheel frame is folded into the chassis; the back of the seat can be folded towards a seat surface; when the rotating bracket rotates from a state of being crossed and locked with the chassis to a state of being parallel to the chassis, the back end of the chassis is driven, and the distance between the two front wheels is reduced at the same time.

Description

technical field [0001] The invention relates to a foldable bicycle, in particular to a foldable tricycle with double front steering wheels. Background technique [0002] Compared with two-wheeled bicycle, the three-wheeled bicycle with seat that double front-wheel turns to single rear-wheel drive is more comfortable and steady is conducive to long-distance driving, but is not easy to store or carry, known collapsible double front steering wheel three-wheel Bicycle such as the invention patent of application number 200410079952.3 "a kind of foldable three-wheeled bicycle with double joysticks and double front steering wheels" provides a foldable three-wheeled bicycle, but it has complicated structure, insufficient comfort of the seat and only It is suitable for the defects and limitations of the reciprocating swing driving device, and because the distance between the two front wheels cannot be changed, it cannot take into account that the distance between the two front wheels...

AI Technical Summary

Problems solved by technology

[0002] Compared with two-wheeled bicycle, the three-wheeled bicycle with seat that double front-wheel turns to single rear-wheel drive is more comfortable and steady is conducive to long-distance driving, but is not easy to store or carry, known collapsible double front steering wheel three-wheel Bicycle such as the invention patent of application number 200410079952.3 "a kind of foldable three-wheeled bicycle with double joysticks and double front steering wheels" provides a foldable three-wheeled bicycle, but it has complicated structure, insufficient comfort of the seat and only It is suitable for the defects and limitations of the reciprocating swing driving device, and because the distance between the two front wheels cannot be changed, it cannot take into account that the distance between the two front wheels should be small after folding and that the distance between the front wheels should be relatively large when it is in use, especially on the transverse slope, so that it is not easy to sideways turn

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