| 摘要 |
PCT No. PCT/EP80/00054 Sec. 371 Date Mar. 23, 1981 Sec. 102(e) Date Mar. 17, 1981 PCT Filed Jul. 15, 1980 PCT Pub. No. WO81/00313 PCT Pub. Date Feb. 5, 1981.A transmission ratio selecting mechanism including a ratio selector means (typically a hand lever), first and second ratio coupling members (36b,37 ) movable to select a number of ratios in the forward and reverse drive directions of an associated transmission, and linkage means (65,63,54,61,62,59,57,60,65,63,64,70,71,68,67,69) for moving the ratio coupling members in response to movement of the ratio selector means. The ratio selecting mechanism includes disconnecting means (72,73,63,64) for disconnecting one (37) of the ratio coupling members from the selector means during selection of the reverse ratios of the transmission. During selection of any reverse ratio both the gear coupling means are initially moved in synchronism in response to movement of the selector means to complete the first part of the selection of the particular reverse ratio, the disconnecting means is then operated, and selection of the reverse ratio is completed by further movement of only one (36b) of the ratio coupling means in response to further movement of the selector means. The selector means is arranged to return the ratio coupling members to synchronism on movement of the selector means to disengage the reverse ratio. |
