GB495857A - Improvements relating to three-speed double change gear with a synchronising device - Google Patents

Abstract

495,857. Variable - speed gearing ; clutches. HERING, E. Feb. 15, 1937, No. 4568. Void. Convention date, Feb. 15, 1936. [Class 80 (ii)] Relates to gears wherein the engine may be clutched to one or the other of two coaxial shafts. The gearing itself admits of three speed-changes and thus, by using the shafts alternatively, six speeds and a reverse may be obtained. Synchronizing means are employed to facilitate changes. The inner shaft 8, Fig. 1, which has one end 8b journalled in the driven shaft 8a, is surrounded by a shaft 12. To a lay-shaft 13 is keyed a wheel 78 gearing with a wheel 81 keyed to the shaft 8. Freely rotatable on shaft 13 is a wheel 79 gearing with a wheel 80 fixed on the shaft 12. Between the wheels 78, 79 is a free-wheel clutch 84. On the shaft 8 is mounted one member of a clutch 87 serving to connect the driving and driven shafts 8, 8a directly. At its front end the shaft 8a has splines 88, Fig. 4, to engage splines 89 on a slidable wheel 90, Figs. 1, 4. When wheel 90 is moved to the left, the splines 89 engage the dog clutch 87. The shaft 8a is reduced to form a shoulder 104, Fig. 4, against which bears a bush 105 freely rotatable on shaft 8a and having a coned end 106 on which rotates a correspondingly coned ring 107. At the outer end of ring 107 are fitted balls 108. In the shoulder 104 a recess for each ball is provided, this recess being longer than the diameter of the ball. Certain splines 89a, Fig. 6, are shorter than the others and are tapered at their ends. To the bush 105 is keyed a wheel 109 provided at its front end with a clutch member 110 adapted to engage the splines 89. When the wheel 90 is prevented from moving axially, the pressure exerted by the gear-changing lever is transmitted to the ring 107 which ultimately rotates the bush 105, and wheel 109. When synchronism is obtained the balls 108 under the action of the gearengaging pressure slide along the inclined surfaces of the ribs 89a into an intermediate space 108b located between these ribs. The wheel 109 gears with a wheel 111 keyed on shaft 13. Adjacent the wheel 111 is a slidably mounted wheel 112. On a separate shaft 113, Fig. 2, is mounted a double wheel 114 for reverse. The wheels are moved by three forks 122-124, Figs. 2, 3. The gear lever may engage a recess 118, Fig. 3, in a plate 103 pivoted at 115 to move forks 122 or 123. When pushed downward it engages a recess in the fork 124 and is free of the plate 103. For first and second speeds, wheel 112 is moved to gear with wheel 90. For third and fourth speeds, the splines 89 and 110 are engaged. For fifth and sixth speeds, the splines 89 are engaged with the clutch 87.