Internal-tooth gear driven type rotary measuring head base

Abstract

The invention relates to an internal-tooth gear driven type rotary measuring head base, which comprises a measuring head connected to a rotor of the measuring head base, a motor fixed in the eccentric position of the rotor of the measuring head base and a drive gear set. The invention is characterized in that the drive gears on the motor are engaged with an internal-tooth gear fixed in the measuring head base; the circle centre of the internal-tooth gear is coincident with the rotary circle centre of the rotor of the measuring head base. In the internal-tooth gear driven type rotary measuring head base, the internal-tooth gear is used for replacing an external-tooth gear to drive the rotor and the measuring head to do circular motion; the drive ratio of the internal-tooth gear is 5:1, while the drive ratio of the original external gear is 3:1; the rotary radius of the internal-tooth gear is twice as long as that of the external-tooth gear so that the internal-tooth gear has a larger torque, and loads of the motor during rotation are reduced; the rotating force is large and stable so that the motion positioning accuracy is increased. The internal-tooth gear driven type rotary measuring head base also overcomes the defect that the radius of the external-tooth gear is small because of limit internal space of the present rotary measuring head base, and simultaneously saves space of the center so that other parts can be installed.

Description

【Technical field】 [0001] The invention relates to the field of precision measurement, such as a full-automatic measuring head of a three-coordinate measuring machine and other measuring instruments or dimension measuring parts of machine tools, in particular to a rotating measuring head seat of an internal gear transmission type. 【Background technique】 [0002] In the three-coordinate measuring machine used for precision dimension measurement, the probe has the function of measuring any position in the three coordinate directions of x, y, and z. In order to complete the measurement work, the three-coordinate measuring machine is equipped with a rotating probe. The rotating probe can rotate relative to the measuring base by rotating the probe base, and rotate the probe to different angles to achieve the required angle measurement of the probe. Work. In the prior art, a commonly used structure is: the motor of the rotating probe base is fixed on the rotating body, and the tra...

AI Technical Summary

Problems solved by technology

However, there are unavoidable shortcomings in the rotary probe of this type of structure, such as: the rotary probe seat is a precision component, and its internal space is limited, so that the radius size of the external tooth gear is limited, which will not be able to obtain a larger transmission ratio and torque. When driving the probe or extension rod probe to rotate, the motor load is large, the rotation force is small, the movement is not stable, and the movement positioning accuracy is low

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