Eccentric oscillation type reduction gear

Abstract

To provide an eccentric oscillation-type speed reduction device capable of suppressing increase of mechanical loss while reducing lost motion.SOLUTION: In an eccentric oscillation-type speed reduction device including: an eccentric body 12; an external tooth gear 16 oscillated by the eccentric body 12; an internal tooth gear 18 engaged with the external tooth gear 16; an eccentric bearing 20 disposed between the eccentric body 12 and the external tooth gear 16; and a pin body 22 synchronized with an auto-rotation component of the external tooth gear 16, the eccentric oscillation-type speed reduction device is constituted so that a pin hole clearance X2 is negative, and the following formula (1) is satisfied when an internal clearance in a radial direction of the eccentric bearing 20 is an eccentric bearing clearance X1, and a clearance between the pin body 22 and a pin hole 32 in an anti-maximum eccentric direction from an axis C22 of the pin body 22 when the axis C22 of the pin body 22 directs in the maximum eccentric direction, is a pin hole clearance X2. Eccentric bearing clearance X1+pin hole clearance X2>0 ... (1)SELECTED DRAWING: Figure 2

Claims

1. Eccentric body and The external gear is oscillated by the aforementioned eccentric body, An internal gear that meshes with the aforementioned external gear, An eccentric bearing is disposed between the eccentric body and the external gear, An eccentric oscillating type reduction gear comprising a pin body that synchronizes with the rotational component of the external gear, The external gear is provided with a pin hole through which the pin body is inserted, which is offset radially from the center of the external gear. The internal clearance in the radial direction of the aforementioned eccentric bearing is referred to as the eccentric bearing clearance X1. When the axis of the pin body is in the direction of maximum eccentricity, the gap between the pin body and the pin hole in the direction opposite to the axis of the pin body is called the pin hole gap X2. An eccentric oscillating reduction gear configured such that the pinhole gap X2 is negative and satisfies the following equation (1). Eccentric bearing clearance X1 + pin hole clearance X2 > 0 ... (1)

2. When the gap between the external gear and the internal gear in the direction of maximum eccentricity is called the intertooth gap X3, The eccentric oscillating type reduction gear according to claim 1, wherein the intertooth gap X3 is negative and is configured to satisfy the following formula (2). Eccentric bearing clearance X1 + inter-tooth clearance X3 > 0 ... (2)

3. When the gap between the external gear and the internal gear in the direction of maximum eccentricity is called the intertooth gap X3, The eccentric oscillating type reduction gear according to claim 1 or 2, wherein the intertooth gap X3 is positively larger than the pinhole gap X2.

4. Eccentric body and The external gear is oscillated by the aforementioned eccentric body, An internal gear that meshes with the aforementioned external gear, An eccentric bearing is disposed between the eccentric body and the external gear, An eccentric oscillating type reduction gear comprising a pin body that synchronizes with the rotational component of the external gear, The external gear is provided with a pin hole through which the pin body is inserted, which is offset radially from the center of the external gear. The internal clearance of the eccentric bearing in the direction of maximum eccentricity is referred to as the eccentric bearing clearance X1. When the gap between the external gear and the internal gear in the direction of maximum eccentricity is called the intertooth gap X3, An eccentric oscillating reduction gear configured such that the intertooth gap X3 is negative and satisfies the following equation (2). Eccentric bearing clearance X1 + inter-tooth clearance X3 > 0 ... (2)

5. When the axis of the pin body is in the direction of maximum eccentricity, the gap between the pin body and the pin hole in the direction opposite to the axis of the pin body is called the pin hole gap X2. The eccentric oscillating type reduction device according to claim 4, wherein the intertooth gap X3 is positively larger than the pinhole gap X2.

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