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    • 1. 发明公开
    • EP0916541A4 -
    • EP0916541A4 - Google专利
    • EP0916541A4
    • 1999-06-30
    • EP97933856
    • 1997-07-31
    • B60K17/356B60K23/08F16H61/452F16H61/456
    • F16H61/456B60K17/356B60K23/0808F16H61/4052F16H61/4148
    • A travelling equipment for hydraulic four-wheel drive vehicles which provides a stable traction and travelling speed even in travelling on a bumpy road surface, offers a long service life for hydraulic equipment, and is economical. The equipment, having a variable displacement hydraulic pump and front and rear wheel side hydraulic motors, comprises a closed center type front wheel side directional switching valve (3F) provided for the front wheel side hydraulic motor (2F), a closed center type rear wheel side directional switching valve (3R) provided for the rear wheel side hydraulic motor (2R), pump flow rate control means for controlling a pump discharge oil quantity so as to maintain differential pressures across the respective directional switching valves (3F, 3R) constant, and a communication valve (5) provided between an oil passage (4F) extending from the front wheel side directional switching valve to the front wheel side hydraulic motor and an oil passage (4R) extending from the rear wheel side directional switching valve to the rear wheel side hydraulic motor to provide communication or shut-off between these oil passages.
    • 一种用于液压四轮驱动车辆的行驶装置,即使在颠簸的路面上行驶时也能提供稳定的牵引力和行驶速度,液压设备的使用寿命长,并且经济。 具有变排量液压泵和前后轮液压马达的设备包括为前轮侧液压马达(2F)设置的闭中心型前轮侧方向转换阀(3F),闭中心型后轮 为了使各方向切换阀(3F,3R)的压差保持恒定而对泵排出油量进行控制的泵流量控制装置;以及设置在后轮侧液压马达(2R) 和设置在从前轮侧方向切换阀延伸到前轮侧液压马达的油路(4F)与从后轮侧切换阀延伸到后方的油路(4R)之间的连通阀(5) 以提供这些油道之间的连通或关闭。
    • 6. 发明公开
    • Smooth pilot-operated series-parallel hydrostatic transmission
    • Ruckfreie reiheder并行平台,Steuerdruck gesteuerte传输
    • EP2354601A1
    • 2011-08-10
    • EP10013215.8
    • 2003-04-15
    • Caterpillar Paving Products Inc.
    • Mares, Riccardo
    • F16H61/46B60K17/10F16H61/4035F16H61/433F16H61/452
    • F16H61/4035B60K17/10F16H61/4052F16H61/433F16H61/439F16H61/452
    • According to the present invention an improved hydraulic transmission system is provide which comprises: supply means (3) adapted to supply a variable flow rate of hydraulic working fluid, said supply means comprising hydraulic adjustment means (77) for adjusting the variable flow rate of the hydraulic working fluid; actuatable hydraulic control means (31) having an actuated condition in which the actuatable hydraulic control means generates a hydraulic control fluid having a control pressure which is adjustable between an initial control pressure and a maximum control pressure; and first connection control means (122) operable by said hydraulic control fluid supplied from said hydraulic control means (31) and adapted to direct, upon actuation of said hydraulic control means, said hydraulic control fluid to said hydraulic adjustment means (77).
    • 根据本发明,提供了一种改进的液压传动系统,其包括:适于提供液压工作流体的可变流量的供应装置(3),所述供应装置包括用于调节所述液压工作流体的可变流量的液压调节装置(77) 液压工作液; 可启动液压控制装置(31),其具有致动状态,其中可启动液压控制装置产生具有在初始控制压力和最大控制压力之间可调节的控制压力的液压控制流体; 以及由所述液压控制装置(31)供应的所述液压控制流体可操作的第一连接控制装置(122),并且适于在所述液压控制装置致动时将所述液压控制流体引导到所述液压调节装置(77)。