735C and 745C Articulated Trucks Machine Systems Caterpillar


Secondary Steering System

Usage:

735C LFJ



图 1g03745841

转向直行保持

(1) 转向和举倾机构泵

(2) 泵驱动壳体

(3) 切断滑阀

(4) 流量补偿器滑阀

(5) 主转向压力开关

(6) 组合阀

(7) 信号分解器

(8) 辅助转向泵

(9) 转向控制阀

(10) 转向油缸

(14) 旋转滑阀

(15) 摆线泵

(16) 低速回油单向阀

(17) 主液压油箱

(18) 分流器阀

(19) 边缘阀芯

(21) 回流单向阀

(22) 分流器阀

(A) 至举倾阀的供油

(B) 来自举倾阀的回油

(C) 主风扇驱动回路

(D) ATAAC 风扇驱动回路

(E) XAD 阀回路

当来自主转向压力开关 (5) 的信号指示主转向压力损失时。 变速箱 ECM 接通电动辅助转向泵 (8) ,由其向手动计量装置(转向控制阀) (9) 提供油流。 转向控制阀 (9) 和转向油缸 (10) 在使用来自转向和举倾机构泵 (1) 的油流时操作相同。 在保持位置,转向控制阀 (9) 中的滑阀阻止油流向转向油缸。

来自辅助转向泵的油流过边缘滑阀 (19) 。 然后,油流过组合阀 (6) 中的单向阀。 回流单向阀 (21) 防止任何油压启用主转向压力开关。 辅助泵压力经过泵控制阀中的节流孔流向安全阀 (20) ,形成泵信号。 此信号经过平行通路流向转向信号回路。 辅助转向泵油流被阻止进入转向和举倾机构泵 (1) 回路。 主转向压力开关 (5) 通过回流单向阀

与主转向系统处于保持状态类似,信号压力通过信号分解器 (7) 输送到转向和举倾机构泵中的流量补偿器滑阀 (4) 。 由于发动机处于关闭状态,将不存在影响。 辅助信号还经过低速泄漏通路,通过低速回油单向阀 (16) 流向主液压油箱 (17) 。 在保持状态,转向系统通过辅助转向泵加压,以响应任何转向请求。




图 2g03745956

左转

(1) 转向和举倾机构泵

(2) 泵驱动壳体

(3) 切断滑阀

(4) 流量补偿器滑阀

(5) 主转向压力开关

(6) 组合阀

(7) 信号分解器

(8) 辅助转向泵

(9) 转向控制阀

(10) 转向油缸

(14) 旋转滑阀

(15) 摆线泵

(16) 低速回油单向阀

(17) 主液压油箱

(18) 分流器阀

(19) 边缘阀芯

(21) 回流单向阀

(22) 分流器阀

(A) 至举倾阀的供油

(B) 来自举倾阀的回油

(C) 主风扇驱动回路

(D) ATAAC 风扇驱动回路

(E) XAD 阀回路

转向控制阀 (9) 中的旋转滑阀 (14) 和摆线泵 (15) 引导辅助供油流向转向油缸 (10) 。 当方向盘按照主转向系统中所述的相同方式旋转时,出现此动作。

负载感应压力通过转向控制阀的方向滑阀中的节流孔,输送到负载感应管路。 与主转向系统类似,负载感应压力正比于方向盘转速和机器转向阻力。 随着负载感应回路中的压力增加,辅助转向泵中的边缘滑阀 (19) 将调整,以保持相对于转向请求的正确流量和压力。

回流单向阀 (21) 阻止辅助转向泵油流进入转向和举倾机构泵 (1) 回路和主转向压力开关 (5) 。 信号单向阀 (22) 阻止辅助转向泵信号压力到达主转向压力开关。

注: 辅助转向电动马达将提供转向最多 1 分钟。 当在发动机熄火的情况下降下车斗时,应一次只使用马达 30 秒,每次使用之间等待 3 分钟。 此策略将使蓄电池恢复。

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