差速转向履带拖拉机液压操纵系统匹配研究  

Research on Matching of Hydraulic Steering System of Differential Steering Crawler Tractor

作　　者：史金钟[1] 

机构地区：[1]拖拉机动力系统国家重点实验室,洛阳拖拉机研究所有限公司,河南洛阳471039

出　　处：《拖拉机与农用运输车》2017年第6期27-30,33,共5页Tractor & Farm Transporter

摘　　要：对差速转向履带拖拉机转向系统进行了介绍,以实现履带拖拉机转向操纵的精准性为目标,对差速转向履带拖拉机转向操纵涉及的机械操纵机构、液压先导阀、转向液压泵排量控制机构之间的控制过程、机理进行了分析,进一步对液压先导阀特性曲线的选择、先导阀输出压力与变量泵排量控制输入压力的匹配进行了研究。提出了液压先导阀输出压力采用双斜率特性曲线既可以实现履带拖拉机低速行进时的快速转向,又可以提高其高速行进时的转向安全性;基于先导阀摆动行程有限,在先导阀与转向盘之间增加角度转换机构,可以使履带拖拉机转向操作符合道路车辆的操作习惯。The paper introduces the differential steering of crawler tractor steering system,in order to achieve the precision of crawler tractor steering control,analyzes the control process and mechanism among mechanical control mechanism,hydraulic pilot valve and steering control process of hydraulic pump displacement involved in the differential steering of crawler tractor steering control,further studies the selection of hydraulic pilot valve characteristic curve,pilot valve output pressure and pump displacement control input pressure. The proposed hydraulic pilot valve output pressure double slope characteristic curve not only can realize the fast steering of crawler tractor moving at a low speed but also can improve the safety of steering at high speed; based on the limited swing stroke of pilot valve,adding angle conversion mechanism between pilot valve and steering wheel can make the crawler tractor steering accord with road vehicles operating habit.

关 键 词：差速转向 履带拖拉机 操纵 先导阀 匹配 

分 类 号：S219.2[农业科学—农业机械化工程]