Abstract: An underframe end structure without a bolster beam for a rail vehicle, including an underframe end beam, an underframe edge beam, a coupler mounting base, coupler support beams, and oblique support beams, where the front of the coupler mounting base is connected to the underframe end beam through the oblique support beams, two sides of the coupler mounting base are connected to the underframe edge beam through the coupler support beams, so that quadrilateral frame structures are respectively formed on the two sides of the coupler mounting base, the oblique support beams form an included angle of 55° to 80° with a forward opening, and the coupler support beams form an included angle of 120° to 140° with a backward opening.

Abstract: A sealing device for a gas-liquid two-phase fluid medium under variable working conditions includes a rotating shaft and a housing, and a chamber formed by the housing is configured to accommodate the gas-liquid two-phase fluid medium. The sealing device further includes a labyrinth sealing mechanism and a fluid dynamic-pressure mechanical sealing mechanism with double end faces, where the labyrinth sealing mechanism and the fluid dynamic-pressure mechanical sealing mechanism with double end faces conduct mutual synergetic effect. Sealing buffer chambers are arranged between the labyrinth sealing mechanism and the fluid dynamic-pressure mechanical sealing mechanism; the fluid dynamic-pressure mechanical sealing mechanism is provided with stationary rings and movable rings, where the stationary rings and the movable rings oppositely abut against with each other.

Abstract: A sealing device for a gas-liquid two-phase fluid medium under variable working conditions includes a rotating shaft and a housing, and a chamber formed by the housing is configured to accommodate the gas-liquid two-phase fluid medium. The sealing device further includes a labyrinth sealing mechanism and a fluid dynamic-pressure mechanical sealing mechanism with double end faces, where the labyrinth sealing mechanism and the fluid dynamic-pressure mechanical sealing mechanism with double end faces conduct mutual synergetic effect. Sealing buffer chambers are arranged between the labyrinth sealing mechanism and the fluid dynamic-pressure mechanical sealing mechanism; the fluid dynamic-pressure mechanical sealing mechanism is provided with stationary rings and movable rings, where the stationary rings and the movable rings oppositely abut against with each other.

Abstract: A roof for a recreational vehicle may include a roof frame made by bending circular tubes and a roof plate. The roof plate is connected to the roof frame via a roof plate sealing rubber strip and a frame sealing rubber strip. The roof plate sealing rubber strip covers the peripheral edge of the roof plate through a groove formed at one side of the roof plate sealing rubber strip, and the other side of the roof plate sealing rubber strip is inserted into a slot of the top of the frame sealing rubber strip and is clamped by lips on both sides of the slot, and the frame sealing rubber strip is adhered onto the roof frame.

Abstract: Herein disclosed is a roof for a recreational vehicle including a roof frame made by bending circular tubes and a roof plate. The roof plate is connected to the roof frame via a roof plate sealing rubber strip and a frame sealing rubber strip. The roof plate sealing rubber strip covers the peripheral edge of the roof plate through a groove formed at one side of the roof plate sealing rubber strip, and the other side of the roof plate sealing rubber strip is inserted into a slot of the top of the frame sealing rubber strip and is clamped by lips on both sides of the slot, and the frame sealing rubber strip is adhered onto the roof frame. Compared with a conventional roof for a recreational vehicle, such roof for a recreational vehicle according to the present invention can solve the problem that the roof frame made of circular tubes and the roof plate cannot be flushed with each other and the problem of the leakage of rain.