Backlash eliminating device for helical gears

摘要

A backlash eliminating device for helical gears is provided for a gear transmission system which includes a transmission shaft, two helical gears and a match gear. A sleeve mounted on the transmission shaft has an outer wall, an inner wall and at least two sections of spiral grooves penetrating through the outer wall and the inner wall. The sleeve includes a transmission part and two extremity parts. The transmission part is disposed between the spiral grooves, and is fixedly connected to the transmission shaft. The extremity parts are disposed outside of the spiral grooves. The helical gears are fixedly connected to the two extremity parts. The sleeve having the spiral grooves provides a preload spring force along an axial direction of the transmission shaft, so that the two helical gears are tightly engaged with the match gear.

主权项

1. A backlash eliminating device for helical gears, wherein the backlash eliminating device for helical gears is used in a gear transmission system comprising two helical gears and a match gear engaged with the two helical gears, the backlash eliminating device comprising:
a sleeve being coaxial with the two helical gears and having two extremity parts, wherein the two extremity parts are respectively connected to the two helical gears, so that a predetermined gap is formed between the two helical gears, and at least two sections of spiral grooves are formed between the two extremity parts of the sleeve, each section of spiral grooves penetrates a peripheral surface of the sleeve and surrounds the sleeve for at least two circles to form at least two sections of spiral sheet structures, wherein, each section of spiral sheet structures provides a preload spring force along an axial direction, so that the two helical gears are engaged with the match gear without leaving any backlash.