A child seat for riding vehicles comprising a cross beam, a front fork, and a cushion disposed on the cross beam, a foldable armrest being mounted at the connection position between the cross beam and the front fork, a position-adjustable bearing beam which is erected on an oblique vehicle pipe being disposed on the front fork, reversible pedals being disposed at the bottoms of the two side plates of the front fork and an axle connection member connected to a seat pipe of the riding vehicle. The angle between the cross beam and the front fork is adjustable, and the child seat realizes fast and toolless installation and remove.

A vehicle wheel axle assembly having: an axle sleeve with first and second end faces and an axial opening having a radially inwardly projecting first engagement surface; and a control shaft with a radially outwardly projecting second engagement surface. The control shaft is axially retained to the axle sleeve by an overlie engagement at an engagement interface between the first and second engagement surfaces to limit the axial displacement of the control shaft in a retracting direction relative to the axle sleeve. At least one of: the first engagement surface is in an engagement element discreet from and axially retained to the axle sleeve such that the engagement element may be installed to the axle sleeve and/or removed from the axle sleeve; and the second engagement surface is in an engagement element discreet from and axially retained to the control shaft such that the engagement element may be installed to the control shaft and/or removed from the control shaft.

A child vehicle includes a front frame having a handlebar with a steering tube and a front fork having a fork stem and a front wheel, a rear frame including a head tube and a rear wheel, and a sleeve assembly mounted to the front frame and engaging the rear frame to rotatably connect the front and rear frames in a tool-less manner. A method of tool-less assembly of a child vehicle includes inserting an end of the fork stem through the head tube, sliding an inner sleeve over the end of the fork stem and positively connecting the inner sleeve to the fork stem, sliding the outer sleeve over an end of the steering tube, connecting the steering tube to the fork stem, and connecting the outer sleeve to the inner sleeve. A child vehicle having a rear wheel connected to the vehicle in a tool-less manner and a method of achieving such a tool-less connection is also disclosed.

This disclosure describes a low-profile, high-load, and hands-free ball-balancing omnidirectional rolling system with multiple human-robot interfaces for modular and adaptive design configurations and input control interfaces. The disclosed platform uses a self-balancing ball-based robot to allow for a safe, compact, high-load, self-balancing and intuitive mobility device for a person with lower-limb disability. Advanced driving assistance such as obstacle avoidance and semi-autonomous navigation between predefined locations is also disclosed.

Provided are: a battery case structure for electric-powered vehicles wherein restrictions on the size or the like of a battery mountable on electric-powered vehicles are alleviated, and the attaching/detaching operability is improved; and an electric-powered vehicle. A battery case structure is equipped with: a cover member which is disposed below the center in the longitudinal direction of a main frame and rocks in the transverse direction of the vehicle; and a lower frame which is connected to the main frame, and is disposed in such a manner as to go around the bottom of the cover member. A battery is detachably inserted into the cover member through the detachable opening separated from the main frame. When the detachable opening is brought close to the main frame, the battery housed in the cover member is supported on the lower frame and housed between the lower frame and the main frame.

Examples of the present disclosure relate to a bicycle configured to easily and efficiently adapt for riders of different sizes while providing both balance bike and pedal bike functionality. An exemplary bicycle is a children's bicycle designed and developed to grow with a child. An exemplary bicycle is configured to enable utility adjustments to a front assembly, among other components, which creates a setup that comfortably accommodates either smaller riders or larger-sized riders. The bicycle is adjustable with minimal effort and without tools, enabling re-configuration on the fly. Further disclosed is an exemplary training wheel device that is attachable to an exemplary bicycle. An exemplary training wheel device extends functionality of the bicycle and assist with training a young child to ride the bicycle.

The invention solves the issue of stiff mounting of a wheel to a bicycle frame. The essential feature of the invention is that in the seating nests of the axle are bulges and hollows with slanting surfaces. The outer contour of the axle's wall section, which is parallel to the wheel symmetry plane which goes through the slanting surface, has a non-circular shape, preferably the shape of a regular polygon or similar to a regular polygon or an irregular polygon or the shape of an irregular closed curve.

A rotation calculating system, comprising: a first optical characteristic acquiring device, configured to acquire optical characteristics for at least one feature of a first target device; and a calculating unit, configured to calculate rotation for a first rotating device based on the optical characteristics of the feature of the first target device. The first rotating device is a wheel, and the first target device is the wheel.

A bicycle hub assembly comprises a sprocket support body. The sprocket support body includes at least ten external spline teeth, a base support, and a larger-diameter part. The at least ten external spline teeth are configured to engage with a bicycle rear sprocket assembly. The at least ten external spline teeth radially outwardly extend from the base support. The larger-diameter part extends radially outwardly from the base support. Each of the at least ten external spline teeth has an external-spline driving surface and an external-spline non-driving surface.

A personal transport vehicle is provided, which includes a front wheel assembly having a front rim and a front tire seated on the front rim, and a rear wheel assembly having a rear rim and a rear tire seated on the rear rim. The vehicle also includes a motor disposed within the rear rim of the rear wheel assembly and coupled to a mount of the rear rim, where the motor is configured to rotate the rear tire to cause movement of the personal transport vehicle. The vehicle further includes a frame coupled to the front wheel assembly and to the motor disposed within the rear wheel assembly, and a steering arm coupled to the front wheel assembly within the front rim for controlling movement of the front tire for steering the personal transport vehicle.