| 摘要 |
1,160,393. Change-speed gear; clutches. FORD MOTOR CO. Ltd. 20 Feb., 1967 [2 May, 1966], No. 7930/67. Headings F2C and F2D. In a change-speed gear for a motor vehicle wherein steps 34, 46, 48, 50 of countershaft gear clusters 36 respectively mesh an input gear 32, intermediate and low gears 52, 54 and a reverse gear 58 through an idler 56, the gears 32, 52, 54, 58 are selectively connected to an output shaft 12 by an axially movable sleeve 72 having external splines 74 engageable with internal splines 76, 78, 80, 82 in the gears, and a friction clutch 86 which normally connects the sleeve 72 to the output shaft 12 is automatically disengaged during ratio shift. Friction discs 84, 88 of the clutch 86 are respectively splined to the sleeve 72 and to a hub 90 which is splined on the output shaft 12. The discs 84, 88 are urged into light frictional engagement between a back plate 102 and a presser plate 104 by a waved spring 106. Interengaging cam teeth 110, 118 between the hub 109 and presser plate 104 and interengaging cam teeth'108, 112 between the hub 109 and a drum 100 fast with the back plate 102 produce a torque responsive axial engaging force on the clutch discs. During ratio shift the hub 109 and sleeve 72 are moved axially by a shift rod 140 and pins 122 carried by the hub 109 ride up cam surfaces 128, 130, 132, 134 on the shaft 12 so that the outer conical ends of the pins 122 coact with cam surfaces 126 on the presser plate to retract the latter and disengage the clutch. During establishment of a new ratio the pins engage the next recess in the shaft 12 and permit the springs 106 to initiate re-engagement of the clutch 86. Balls 98 connect the sleeve 72 and hub 109, for conjoint axial movement whilst permitting relative rotation. The input shaft 10 is connected to an engine crank-shaft by a main clutch (not shown). Three equally spaced gear clusters 36 support the gears 52, 54, 58 without bearings. The gears have double helical teeth to avoid axial thrusts. |
