ZiU 682

ZiU-9 (also ZIU-682) - Soviet high trolley high capacity for intracity passenger traffic. This model trolleybus is in serial production since 1972 till now, having gone through several upgrades. A large volume of issue of ZIU-9 has allowed him to become the dominant model of a trolley bus in the Soviet Union since the late 1970-ies. This status is largely persists in modern Russia. In the 1990-ies on the basis of ZIU-9 other manufacturers trolleybuses, organized mainly on the basis of repair plants, have developed their own versions of this machine (the so-called "clones"). There were built more than 42 000 trolleybuses family ZIU-9, which allowed them to become the largest model of a trolley bus in the world. ZiU-9 is a high-floor trolley high capacity for intracity passenger traffic. His steel welded casing is mounted on a steel frame, consisting of a tubular frame complicated spatial shape, transversal trusses and longitudinal girders. The case has three doors, one with narrow at the bow and two wide -- in the mid and aft ends. Doors serovie, open and close automatically from the driver by means of the electric drive (1990 - - of pneumatic drive). The current management through the traction motor (TED) rheostat automatic indirect (group controller). All switching power circuits of pushtorsky resistance and TED run the utility of low-voltage motors. Pushtorsky resistance limit the current through TED, thus controlled by the speed of its rotation and develop them torque. ZiU-9 is equipped with a motor-generator to convert the input DC voltage 550 In low-voltage service 24 C. This conversion is very simple -- the electric motor 550 In rotates coaxially with him generator on the 24th Century, the Disadvantage of this solution is the constant noise from the working engine-generator. However, good lubrication and alignment motor-generator allow to reduce the noise to a tolerable level. In addition, the engine-generator is equipped with a fan, Valet for more efficient cooling start-brake resistors. Low-voltage system includes the above-mentioned group controller, exterior and interior lights and alarm system, door actuators and two rechargeable batteries. Due to separation of levels of stress, sharply reduces the danger of defeat passengers and the driver of electric shock. All electrical equipment inside the passenger cabin and the driver works with safe voltage 24 C. Power 550-volt circuits and units originally located under the floor. However, low electrical safety this decision led to the fact that during upgrades the equipment was transferred to the roof of the trolleybus and in the Cabinet behind the driver. During repair of trolleybuses previous releases in the conditions of a depot or repair plants, high voltage equipment are also often placed on the roof. Brake system ZIU-9 includes electrodynamic, mechanical and pneumatic brakes. To ensure the work of the last machine is equipped with pneumocompression. The first prototypes of ZIU-9 were built in 1971. Elements of appearance, and some constructive decisions were borrowed from the modern foreign cars companies MAN and Chausson". Compared with its predecessor, the ZIU-5, the ZIU-9 is more spacious, cheap and technological welded steel case instead riveted aluminum, as well as additional step of pneumophtisiology body. The dimensions of the trolleybus three-door (with a narrow front door), had a Bóbig area of glazing compared with ZIU-5. In the steering applied power. The traction control system engine rheostat-contactor.