The present invention provides a wheel assembly having an elongate housing configured to engage with and support a sliding panel element. The housing has a first subassembly having a first pair of wheels, the first subassembly being configured so as to allow rocking of the first pair of wheels. The housing also has a second subassembly having a second pair of wheels, the second subassembly being configured so as to allow rocking of the second pair of wheels. The first and second subassemblies are independently vertically adjustable with reference to the housing. The present wheel assemblies may be of the type used to support a sliding door or similar, on a surface such as a track.

An autonomous vehicle assembly comprises a chassis assembly and a storage assembly. The chassis assembly includes a front chassis module and a rear chassis module that are selectively connectable to one another. The front chassis module includes a front wheel and an EBS assembly for steering the front wheel and the rear chassis module includes a rear wheel and a propulsion assembly for driving the rear wheel. An autonomous driving module is selectively connected to the chassis assembly and independently in communication with the EBS assembly and the propulsion assembly.

The present invention provides a wheel assembly having an elongate housing configured to engage with and support a sliding panel element. The housing has a first subassembly having a first pair of wheels, the first subassembly being configured so as to allow rocking of the first pair of wheels. The housing also has a second subassembly having a second pair of wheels, the second subassembly being configured so as to allow rocking of the second pair of wheels. The first and second subassemblies are independently vertically adjustable with reference to the housing. The present wheel assemblies may be of the type used to support a sliding door or similar, on a surface such as a track.

A linear gate drive assembly with a drive rail connectable to a gate panel. The drive rail has a first drive surface. A linear drive portion is coupled to the first drive surface and has teeth thereon with a first rolling tooth profile. The linear drive portion defines a toothed second drive surface. Dive motors are pivotally coupled to a support structure. A first drive wheel is attached to one drive motor and engages the first drive surface to impart an axial drive force on the drive rail. A second drive wheel is attached to another drive motor and engages the second drive surface. The second drive wheel has second teeth that mate with the first teeth and that define a second rolling tooth profile that substantially corresponds to the first rolling tooth profile. Rotation of the second drive wheel imparts axial and normal forces via a rolling teeth interface the mating teeth for moving the drive rail and the gate panel.

An embodiment vehicle hinge driving apparatus includes an actuator, a housing connected to the actuator, an output shaft having an axis aligned with an axis of the housing, a transmission mechanism configured to transmit a torque from the actuator to the output shaft, and a brake unit configured to provide a brake torque to the output shaft.