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A transmission assembly for providing an infinitely variable gearing between an input and take-off shaft, the gearing ratio achieved being dependent on the load applied to the take-off shaft. The assembly comprises a first gear mounted on the input shaft, a second gear mounted on the take-off shaft,

A transmission assembly for providing an infinitely variable gearing between an input and take-off shaft, the gearing ratio achieved being dependent on the load applied to the take-off shaft. The assembly comprises a first gear mounted on the input shaft, a second gear mounted on the take-off shaft, a control gear rotatable, located between the first and second gears and a first gear train providing a driving connection between the first gear and control gear and a second gear train providing a driving connection between the control gear and the second gear, the gear train being rotatably mounted in a gear carrying member rotatably carried on the input and take-off shafts. The gear trains are arranged to induce opposing torques on to the control gear and the gear sizes are such as to provide a step down from the first gear to the control gear and a greater step up from the control gear to the second gear.

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A transmission assembly comprising an input shaft and a take-off shaft in co-axial alignment, a gear carrying member rotatably mounted on the input and take-off shafts, a first gear fixedly mounted on the input shaft and a second gear fixedly mounted on the take-off shaft, a control gear co-axial wi

A transmission assembly comprising an input shaft and a take-off shaft in co-axial alignment, a gear carrying member rotatably mounted on the input and take-off shafts, a first gear fixedly mounted on the input shaft and a second gear fixedly mounted on the take-off shaft, a control gear co-axial with the input and take-off shafts and mounted for rotation relative thereto, a first gear train rotatably carried by the gear carrying member and arranged to provide a driving connection between the first gear and the control gear and a second gear train rotatably carried by the gear carrying member and arranged to provide a driving connection between the control gear and the second gear, the first and second gear trains being arranged to rotate the gear carrying member in opposite directions for a given direction of rotation of the input shaft, the first gear, first gear train and control gear being so sized to form a step down in rotational speed from the first gear to the control gear, and the control gear, second gear train and second gear being so Sized to form a step up in rotational speed from the control gear to the second gear, the gear sizes being such that the amount of step up is greater than the amount of step down, the arrangement being such that for a given speed of rotation of the input shaft the assembly automatically adjusts the speed of rotation of the take-off shaft between a maximum and a minimum speed of revolution in accordance with load applied to the take-off shaft.