MBZ100 Pneumatic External Swing Bus Door Mechanism

MBZ100 Pneumatic External Swing Bus Door Mechanism consists of:

1. Arm asm(including arms, door pillar asm, upr-bracket, tie rod, angular connective irons, door/frame wedges etc.)

2. Pneumatic door mechansim and relevant control units(e.g. emergency valve, solenoid valve, switch)

Technical Data & Specifications:

The cylinder asm consists of two parts- the lower part is a cylinder with cushioning; the upper part is a set of screwing mechanism.

The lower part:in the cylinder the up&down movement of piston realizes close&open operations of door, using the air pressure to drive the screw shaft to lift and drop through the piston movement.

The upper part has three components:

Support:it funcions as 1.the connector between the upper screw mechanism and lower cylinder;2.guiding to the screw shaft working with the spline;3.the bracket of the outer sleeve;4.the primary bearing of the total door weight(thus should be strong enough).

Screw shaft(drive shaft):the priciple part to convert up&down movement to rotating action.

Sleeve asm:rotates along the screw grooves on the screw shaft, driving the arms to swing together.

The upper of the screw shaft is a triangular screw groove(stroke 200mm); the lower is a hex outer spline, working with the inner hex spline in the support, that limits the screw shaft to move under the action of the piston. The inner screw that matches the outer screw of the screw shaft is a floating part, like a nut on a bolt but not fixed in position(rotates under the the up&down movement of screw shaft).

To close the door, the compressed air enters the cylinder from the lower air inlet, pushes the piston upward and turns the sleeve through the screw shaft. The arms attached to the sleeve will turn under the rotary action of the sleeve and close the door. When door engaged with door frame, it cannot move any more while the piston keeps on rising, thus lifting up the screw shaft and sleeve instead. The arms and door will be lifted along with the sleeve, with door wedge engaged with wedge frame on the doorframe to lock the door.

To open the door, the compressed air enters the cylinder from the upper air inlet to pushes the piston downward. The screw shaft, sleeve, arms and door will drop along, firstly released from the frame wedge and then turning outward to open the door to doorframe side parallel to the car body.

Certifications: ISO9001,ISO/TS16949,ISO14001