Вибір раціональних параметрів кермового приводу перспективного тракторного самохідного шасі
| Rok vydání: | 2020 |
|---|---|
| Předmět: |
Tractor
Lever business.product_category Chassis lcsh:Military Science Computer science lcsh:U Mechanical engineering тракторне самохідне шасі з поворотним переднім мостом поворотний міст коефіцієнт корисної дії кермовий привід силовий гідроциліндр геометричні параметри кермового приводу Mechanism (engineering) Axle Hydraulic cylinder Torque Stroke (engine) business |
| Zdroj: | Збірник наукових праць Харківського національного університету Повітряних Сил, Iss 2(64), Pp 128-134 (2020) |
| ISSN: | 2518-1661 2073-7378 |
| DOI: | 10.30748/zhups.2020.64.18 |
| Popis: | Tractor self-propelled chassis have become widely used in various industries and agriculture. In the Air Force of the Armed Forces of Ukraine these vehicles are used to repair the hard surfaces of airfields and can be used in the technological process of aircraft maintenance. Hydrovolumetric steering controls are used in the modern wheeled tractors including tractor self-propelled chassis. The steering gear is a traditional steering trapeze proposed by K. Benz in 1893. It is driven by a power hydraulic cylinder. The layout of the front axle of the self-propelled chassis allows it to rotate during the maneuver which ensures the movement of the left and right wheels without side sliding at any change in the track of the front wheels. In this article a rational choice of the geometry of the lever mechanism by the efficiency criterion is carried out on the example of the steering gear of a perspective tractor self-propelled chassis. The angle of the initial installation of the rotary lever is determined. The steering gear kinematic scheme is a vertical shaft of the front rotary axle gear at the upper end of which a rotary lever, connected to the power hydraulic cylinder, is set. The hollow space of the power hydraulic cylinder is connected with the metering pump of the hydro-volume steering. Analytical expressions for determining the stroke of the power hydraulic cylinder rod and the torque generated by the power hydraulic cylinder are obtained. The work of friction forces in the hinge connecting the rotary lever with the rod of the power hydraulic cylinder is determined. This allowed us to determine the cyclic coefficient of friction losses in the steering gear. It is determined for a perspective tractor self-propelled chassis that the rational angle of the initial installation of the rotary lever is 30°. The maximum values of the cyclic coefficient of friction losses in the steering gear can reach 4.3%. At the selected angle of the initial installation of the rotary lever 30°, these losses reduce and stand for 2.2% when turning left and 0.35% when turning right. The usage of a steering gear with two power hydraulic cylinders allows to equalize the working pressures of the fluid when turning, both to the right and left, to reduce cyclic friction losses to 0.36% at the angle of initial installation of the rotary double-arm lever, that is equal to 0°. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|