公开(公告)号：US5125326A

公开(公告)日：1992-06-30

申请号：US647388

申请日：1991-01-29

Applicant: David M. Sarcona

Inventor： David M. Sarcona

IPC: F15B11/12 ,  F16H61/30

CPC classification number: F15B11/123 ,  F15B11/122 ,  F16H61/30 ,  F16H2061/307 ,  Y10T74/19433

Abstract: A three position actuator which is used to position the gear range control lever on a two speed transfer case. Three positions are required to achieve HIGH, LOW and NEUTRAL. Two individual air chambers may be selectively charged with compressed air to move two pistons along a common actuator rod to achieve linear translation of the control lever to selectively position the transfer case in HIGH, NEUTRAL or LOW range. The transfer case is shifted from LOW to NEUTRAL or HIGH to NEUTRAL by releasing the respective charge of compressed air thereby permitting a spring to shift the control lever to neutral. Thus, in the event of a failure of the system supplying the compressed air, the actuator will return the transfer case to NEUTRAL as required for towing.

Abstract translation: 用于将变速范围控制杆定位在双速传送箱上的三位置执行器。 需要三个位置来实现HIGH，LOW和NEUTRAL。 两个单独的空气室可以选择性地带有压缩空气以沿着共同的致动器杆移动两个活塞，以实现控制杆的线性平移，以选择性地将转移箱定位在高，中性或低的范围。 通过释放压缩空气的相应电荷将转移箱从低位转移到中性或高到中性，从而允许弹簧将控制杆移动到空档。 因此，在供应压缩空气的系统发生故障的情况下，致动器将按照牵引的要求将转移箱返回到中性点。