Patent GB-190411270-A (GB)
Title: Improvements relating to Differential Speed and Reversing Gear.
Inventor: BRAMWELL WILLIAM CALVERT
Filed: 1904-05-16
Granted: 1905-04-06
Abstract: 11,270. Bramwell, W. C., [Bramwell, C. C.]. May 16. Motor road vehicles.-Relates to a variable-speed and reversing toothed gearing, adapted for use with explosion engines on motor road vehicles. The engine crank a, Fig. 1, works in a casing b which is shaped at one end into a bearing b<1> for the crank shaft A and carries at the other a removable head b'. The head b' is provided with h a central sleeve b<3> for the shaft A, and equidistant fixed sleeves b<4> supporting shafts c which carry toothed wheels c<1> in mesh with a pinion a<1> on the shaft a, and also pinions c' in mesh with a pinion d on a sleeve d' turning freely on the sleeve b<3>. The pinions c' which are preferably made of raw hide or fibre are smaller than the wheels c<1>, so that a clutch member e secured to the sleeve d' by a nut e<1> transmits a slow forward drive. A low-speed reversing clutch member f provided with teeth f<1> in mesh with the pinions c' is attached to an enclosing sleeve b<5>. A high-speed forward clutch member g is secured directly to the shaft A. A clutch member h may be moved axially into engagement with either of the members g, e, and is provided with friction surfaces h', h', preferably of leather, engaging with surfaces g<1>, e<2> on the members g, e respectively. The member h is mounted on a sleeve which effects a connection with the driven sprocket i, mounted on a sleeve on a stud i projecting from a plate o on a frame C, by means of ears i<3> on the sleeve of the sprocket i sliding on slots h<Î> on the sleeve of the member h. The sprocket sleeve is held in position by means of a flange and a dog i<2> pivoted to the plate o. The member h may be operated by a fixed collar k embraced by a non-rotating collar k<1> pivoted to a fork k<2> which is secured to a lever k<3> pivoted at k<4> to a bracket k<5>. A collar h<3> is retained in position by a terminal flange l<1> on a sleeve l within the shaft A, and is caused to rotate with it, by a key a' and slot a<3>. The sleeve l is held by a spring a'. A clutch member m adapted to engage the member f is provided with slots engaged by pins m<1> extending from the member h, and is mounted on a sleeve loose on the sleeve of the member h. A spring n in a recess between shoulders on these sleeves normally holds the member m back from the member f. The members h, m move inwards together, but the former coming into engagement stops the motion. The latter is actuated independently by arms of a fork m<3> carried on a rod m<4> bearing against its central part. The lever k<3> and rod m<4> may be connected to hand or foot levers. The rotating clutch members are massive, reducing the mass of the flywheel B. In a modification, shown in Fig. 4, the driven members are all mounted on a disc h on the sleeve of the sprocket i, which sleeve is travorsed axially by a collar and a shipper i<Î>. An outer cone part h<ÎÎ> engages either of the members f, e, and an inwardly-projecting ring h<0> surrounds the high-speed member g. This comprises a hub g', Fig, 5, having a radial arm g<4> provided with lugs g<5>, to which are pivoted bellcrank levers g<6 >weighted at one end and pivoted at the other to the ends respectively of a clutch ring g supported at its middle by another arm g<3>, the whole being keyed to the shaft A and held by a clamping-bolt g<8>. A plunger g' sliding in a guide in the arm g', expands the ring g by means of a wedge g<9> working against rollers g<10> on the ends of that ring. An end of the plunger g<7> projects into the hollow shaft A, and is acted on through a roller by a plunger p, Fig. 4, actuated by a shipper p<1>. Springs g<11> assist the centrifugal action of the weighted parts of the levers g<6> in balancing the centrifugal action of the half-rings g. A weighted lever g<12> similarly balances the plunger g<7> and wedge g<9>. The sleeve b<5> may carry camrings b<6>, Fig. 4, for operating the engine exhaust valves, a spark-timing carrier operating at b<7>. By removing the sprocket-wheel i and its supporting- arrangements, the flywheel, and the engine connecting-rod, and unbolting the head b<2>, the gear may be taken out as a whole.