A mobile elevating work platform includes a chassis and fixed wheels, caster wheels, and a driving and steering wheel secured to the chassis. A control implement coupled with the driving and steering wheel is configured to adjust a steering position of the driving and steering wheel. A drive motor is operable to drive the driving and steering wheel. A platform may be raisable and lowerable with a mast assembly. The control implement may be adjustable to accommodate operator physical characteristics.

The four-wheel steering system includes a front-wheel steering system that steers front wheels of a vehicle and a rear-wheel steering system that steers rear wheels of the vehicle in accordance with a steering angle that is a rotation angle of a steering wheel. The rear-wheel steering system includes a second ECU that, when the vehicle speed is equal to or lower than a vehicle speed threshold, performs antiphase control in which the rear wheels are steered in the opposite direction to that in which the front wheels are steered. When the vehicle speed is equal to or lower than the vehicle speed threshold, the second ECU performs in-phase control in which the rear wheels are steered in the same direction as that in which the front wheels are steered, in response to a specific trigger operation that is performed via the steering wheel.

The universal wheel includes a base member, a vertical axle, a lift member, and a wheel member. The lift member adjusts the universal wheel's height. A first driving element, a second driving element, and an engaging element are configured on the base member and the wheel member. The first driving element for turning the base member laterally within 360 degrees. The second driving element is for rolling the wheel member around its lateral axle. The engaging element couples or decouples an external shaft with the lateral axle of the wheel member. As such, through the first and second driving elements, and the engaging element, the universal wheel can control a height from the ground and can be rolled forward, laterally, obliquely, turned 360 degrees when standing in place, or in a combination of these operations.

A ground milling machine, in particular a road milling machine or stabilizer or recycler, having a machine frame and at least one front travel unit as viewed in a longitudinal machine direction and at least one rear travel unit as viewed in the longitudinal machine direction, each travel unit comprising a respective travel wheel, which is in contact with an underlying ground during travel operation of the ground milling machine and has a wheel tread configured for direct ground contact, or a crawler track, which is in contact with an underlying ground during travel operation of the ground milling machine, and a drive wheel configured for driving the crawler track, at least one travel unit being height-adjustable along a lifting axis via a lifting device and/or being rotatable about a steering axis for steering the ground milling machine, and the at least one travel unit being arranged on the machine frame via a mounting device, said mounting device being configured such that the travel unit can be moved at least partially transversely to the lifting axis and/or steering axis through a translational movement.

A drill rig with a steering system may include a substructure having a wheelhouse, a drill floor arranged atop the substructure, a mast extending upwardly and above the drill floor, and a steering system arranged within the wheelhouse. The steering system may include a wheel assembly comprising an electric motor configured for driving rotational motion of a wheel, a deployment device configuring for deploying the wheel assembly to carry the drill rig, and a steering mechanism configured for selective engagement with the wheel assembly and rotating the wheel assembly.

Disclosed is a shock absorption mechanism of a steering motor, comprising an upper cover buffering assembly (1), and an oil distributor (2) disposed below the upper cover buffering assembly (1), the oil distributor (2) being fitted with the upper cover buffering assembly (1) to form a sealed axial cavity (4). A cylinder assembly (5) is fixedly arranged below the oil distributor (2). The cylinder assembly (5) comprises a cylinder (51) opened at both ends, and an elastic oil bag (52) arranged in the cylinder (51) and having an opening at the upper end, the upper end of the elastic oil bag (52) being fixedly connected to an inner wall of the cylinder (51), and the upper end of the elastic oil bag (52) being in communication with the axial cavity (40). The cylinder (51) is further provided internally with a piston (53) axially sliding along the cylinder (51), the piston (53) being connected to the lower end of the elastic oil bag (52). The shock absorption mechanism for a steering motor overcomes the problem of member damage due to friction and the defect of susceptibility to temperature in a traditional hydraulic shock absorption system, so as to prolong the service life of the shock absorption mechanism.

Disclosed is a shock absorption mechanism of a steering motor, comprising an upper cover buffering assembly (1), and an oil distributor (2) disposed below the upper cover buffering assembly (1), the oil distributor (2) being fitted with the upper cover buffering assembly (1) to form a sealed axial cavity (4). A cylinder assembly (5) is fixedly arranged below the oil distributor (2). The cylinder assembly (5) comprises a cylinder (51) opened at both ends, and an elastic oil bag (52) arranged in the cylinder (51) and having an opening at the upper end, the upper end of the elastic oil bag (52) being fixedly connected to an inner wall of the cylinder (51), and the upper end of the elastic oil bag (52) being in communication with the axial cavity (40). The cylinder (51) is further provided internally with a piston (53) axially sliding along the cylinder (51), the piston (53) being connected to the lower end of the elastic oil bag (52). The shock absorption mechanism for a steering motor overcomes the problem of member damage due to friction and the defect of susceptibility to temperature in a traditional hydraulic shock absorption system, so as to prolong the service life of the shock absorption mechanism.

Disclosed is a double oil passage structure of a steering motor, comprising an upper cover buffering assembly (1) and an oil distributor (2), which are fitted with each other to form an axial cavity (4), wherein an oil flow passage (23), an oil inlet (22) and a hollow column (21) are provided in the oil distributor (2), the oil flow passage (23) being in communication with the axial cavity (4), and an inner wall of the hollow column (21) being provided with an oil flow port in communication with the oil flow passage (23); a directional control valve (3) including a valve core (31) is provided in the hollow column (21), and a first radial cavity is formed between the hollow column (21) and the directional control valve (3) and partitioned by a pin (7) into oil inlet and outlet cavities (24, 25) of the oil distributor which are respectively in communication with the oil inlet (22) and the axial cavity (4); a directional control valve oil flow passage (33) is provided on an upper part of a side wall of a valve cavity (32), and an oil flow hole (34) is provided in a lower part; an annular oil flow groove (35) is provided on an outer wall of the valve core (31), and is in communication with the oil inlet and outlet cavities (24, 25) of the oil distributor; and a second radial cavity (36) is formed by an outer wall of the lower end of the valve core (31) and a side wall of the lower part of the valve cavity (32), and the lower part of the valve cavity (32) is provided with an oil outlet (37) in communication with the second radial cavity (36). The above double oil passage structure partitions the oil passage into two independent branch oil passages, so as to reduce the occupied space and reduce the volume of the motor.

Disclosed is a double oil passage structure of a steering motor, comprising an upper cover buffering assembly (1) and an oil distributor (2), which are fitted with each other to form an axial cavity (4), wherein an oil flow passage (23), an oil inlet (22) and a hollow column (21) are provided in the oil distributor (2), the oil flow passage (23) being in communication with the axial cavity (4), and an inner wall of the hollow column (21) being provided with an oil flow port in communication with the oil flow passage (23); a directional control valve (3) including a valve core (31) is provided in the hollow column (21), and a first radial cavity is formed between the hollow column (21) and the directional control valve (3) and partitioned by a pin (7) into oil inlet and outlet cavities (24, 25) of the oil distributor which are respectively in communication with the oil inlet (22) and the axial cavity (4); a directional control valve oil flow passage (33) is provided on an upper part of a side wall of a valve cavity (32), and an oil flow hole (34) is provided in a lower part; an annular oil flow groove (35) is provided on an outer wall of the valve core (31), and is in communication with the oil inlet and outlet cavities (24, 25) of the oil distributor; and a second radial cavity (36) is formed by an outer wall of the lower end of the valve core (31) and a side wall of the lower part of the valve cavity (32), and the lower part of the valve cavity (32) is provided with an oil outlet (37) in communication with the second radial cavity (36). The above double oil passage structure partitions the oil passage into two independent branch oil passages, so as to reduce the occupied space and reduce the volume of the motor.

A drive device for a handling trolley, including: a chassis; a wheel carrier; a drive wheel; a steering motor for rotating the wheel carrier relative to the chassis; a reduction gear connecting the steering motor to the wheel carrier, the reduction gear including a planetary gear set including an internal sun gear, at least one planet gear, and a planet carrier on which the planet gear is mounted, a ring gear surrounding the internal sun gear and the planet gear. The shaft of the steering motor is fixed relative to the internal sun gear, the wheel carrier is fixed relative to either the planet carrier or the ring gear, and the chassis is fixed relative to the other one of the two components.