| 摘要 |
1,197,560. Change-speed gear. GENERAL MOTORS CORP. 24 April, 1969 [2 May, 1968], No. 20934/69. Headings F2D and F2Q. In a countershaft four speed and reverse gear wherein a synchronized 1-2 clutch sleeve 61 is moved axially on an output sleeve 32 to clutch first and second ratio wheels 36, 34 thereto, and to establish reverse an idler 92 is moved left to mesh teeth 66 on the 1-2 clutch sleeve 61 and a countershaft wheel 28, and the arrangement is such that, during a rightward 2-1 downshift of the 1-2 clutch-sleeve 61, its gear teeth 66 ineffectively mesh the reverse idler 92, clashing on such mesh is avoided by a flexible non- metallic damping ring 87 on the clutch-sleeve 61 having chamfered teeth, which make the initial mesh with the chamfered teeth of the reverse idler 92. The non-metallic damping ring may be of polyurethane, polyamide, or p.t.f.e., of durometer hardness 55 to 70, and is bonded to a metal ring press-fitted on the clutch sleeve 61. The gear input shaft, not shown, passes through the output sleeve 32 and is splined to the first-motion wheel 16 which drives the countershaft cluster 18. A slide-turn selector shaft 127 has a finger 135 which selectively engages notches, e.g. 136, in the 1-2 and 3-4 shift forks 61, 37 and in a slider (112, Figs. 2 and 3, not shown) connected by a lever with the reverse idler shift fork 104. The shift-forks 61, 37 and slider (112) are secured to guided parallel shafts 118 &c., forks 61, 37 being prevented from turning by their forks, the slider (112) by a projection (116) on the fork 117 engaging a notch in the slider (112). A spring (141) inhibits reverse selection. |
