毕业设计论文-8t载货汽车后桥鼓式制动器及其控制系统的设计.doc

8t载货汽车后桥鼓式制动器及其控制系统的设计 摘 要 汽车制动系是用以强制行驶中的汽车减速或停车，使下坡形式的汽车的车速保持稳定以及使已停使的汽车在原地（包括在斜坡上）驻留不动的机构。随着高速公路的发展和车速的提高及车流密度的日益增大，为了保证行车安全，汽车制动系的工作可靠性显得日益重要，也只有制动性能良好，制动系工作可靠的汽车，才能充分发挥其动力性能。 本设计是轻型货车的制动系设计,经过查资料和参考以往的设计,采用液压为动力源的行车制动和以人力手动机械式的驻车车制动.行车制动采用鼓式制动器驻车制动采用附装在后轮上的。即行车制动和驻车制动同用一套制动蹄片和制动鼓。它的特点是可以减少制动系所占的空间,使其总体结构简化,并且在后轮行车制动失效时驻车车制动可以充当刹车,使其安全性能更高。 关键词: 轻型载货车，制动器，设计 Design of bridge of drum brake and control system of 8t truck rear ABSTRACT Automotive brake system is used to force the moving car slow down or stop, so that the cars speed downhill form stable and to have stopped the car in place (including the slope) resides not move the body. With the development of highway and the speed increases and increasing traffic density, in order to ensure traffic safety, vehicle brake system operational reliability is becoming increasingly important, and only the brake good, reliable car brake system, can fully play its dynamic performance. The design is light truck brake system design, through to find information and reference the previous design, the use of hydraulic brake for the power source and the human hand mechanical parking brake. Brake drum brake used in brake attached to the rear wheel using the. The brake and parking brake with a set of brake shoes and brake drums. It can reduce the braking system is characterized by the amount of space, so the overall structure is simplified, and the failure of the rear brake parking brake can act as a brake to secure higher performance. Key words：ight trucks， brake， design 摘 要 1 ABSTRACT 2 第一章 制动系概述 6 1.1 概述 6 1.2 制动器的结构形式 7 第二章 鼓式制动器主要零件设计参数计算 17 2.1 鼓式制动器的设计计算 17 2.2 摩擦衬片的磨损特性计算 22 2.3制动力与制动力分配系数 23 2.4同步附着系数 27 2.5 制动器最大制动力矩 27 第三章 驻车车制动的设计计算 29 3.1 满载时 29 3.2 空载时 30 第四章 制动性能分析 33 4.1 制动性能评价指标 33 4.2 制动效能 33 4.3 制动效能的恒定性 33 4.4 制动时汽车方向的稳定性 33 第五章 制动器主要零件的结构设计 35 5.1制动鼓 35 5.2 制动蹄 36 5.3 制动底板 36 5.4 制动蹄的支承 37 5.5 制动轮缸 37 5.6 摩擦材料 37 5.7 制动器间隙 38 第六章 制动驱动机构的结构形式选择及设计计算 40 结 论