An eccentric dense ball bushing for precise positioning
A technology of precision positioning and dense balls, which is applied in the direction of bearing components, shafts and bearings, rigid supports of bearing components, etc., can solve the problems that cannot be corrected and error compensation, dense ball sleeves cannot be used, cannot be taken out or replaced, etc. Achieve the effects of high positioning accuracy, convenient production and use, and simple structure
Active Publication Date: 2018-02-16
金齿传动科技(大连)有限公司
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Problems solved by technology
However, the current structure of dense ball bushings is a fixed structure with evenly distributed ball holes. Once the steel balls are packaged on the cage, they cannot be taken out or replaced. As long as one steel ball is damaged, the dense ball bushing cannot be used.
In addition, the ball has a single specification and does not have the characteristics of error compensation. It can only achieve high-precision positioning of the part relative to the installation mandrel.
For the installation eccentricity of the installation mandrel itself, the existing fixed dense bead bushing structure cannot be corrected and error compensated
In addition, for the precise positioning of parts that want to achieve a specific eccentricity, the existing dense bead bushing structure cannot meet the requirements
Method used
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[0017] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.
[0018] 1. Eccentric dense ball bushing for precise positioning with small eccentricity for error compensation
[0019] Such as figure 1 As shown, first determine the diameter of the inner and outer rings of the cage and the diameter of the high-precision balls used according to the diameter of the installation mandrel and the inner hole of the part. If the nominal diameter of the installed mandrel is 30mm, the upper deviation is 0, the lower deviation is -0.002mm; the inner diameter of the part is 40mm, the upper deviation is +0.003mm, and the lower deviation is 0. The inner diameter of the cage is 31mm, the outer diameter is 39mm, and the structure of equal wall thickness is selected. The unilateral interference between the high-precision ball and the installation mandrel and parts is 1-3 μm, the diamete...
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An eccentric dense ball bushing for precision positioning, the eccentric dense ball bushing is composed of a cage, high-precision balls and nuts; the cage is processed with evenly distributed balls along the axis direction, and the diameter is 0.1 to 0.2 larger than the diameter of the high-precision balls used Multiple ball chambers of mm; the effective length of the ball chamber is 0.2-0.5mm greater than the integer multiple of the diameter of the high-precision ball; one end of the ball chamber is closed, and the other end is open; one end of the opening is threaded, and the ball chamber is closed by a nut. The diameter of the outer ring of the cage is 1mm smaller than the diameter of the inner hole of the part; the diameter of the inner ring of the cage is 1mm larger than the outer diameter of the installation mandrel; the eccentricity between the inner and outer rings of the cage is the design eccentricity of the dense bead bushing. The invention realizes the positioning error compensation of small eccentricity or the precise positioning requirements of specific eccentricity parts by changing the specifications and sizes of high-precision balls in different ball chambers. The positioning error of the eccentric dense ball bushing is below 0.2 μm, which has good promotion value and market application prospects.
Description
technical field [0001] The invention belongs to the technical field of precision machinery manufacturing and testing, and relates to a precision eccentric dense bead bushing for improving the radial positioning accuracy of parts. Background technique [0002] In the field of precision machining and measurement, the installation eccentric error of parts is an important error that cannot be ignored. For rotary parts (such as shafts, inner and outer rings of bearings, discs, etc.), the eccentricity error of the installation of the parts directly affects the circular runout accuracy of the parts. At present, there are three kinds of radial positioning methods for commonly used holes and shaft parts: clearance fit, expansion mandrel or elastic mandrel, and dense bead bushing. In addition to the clearance fit, the expansion mandrel, elastic mandrel and dense bead bushing all have corresponding invention patents. For example, the published patent-new high-precision dense ball sha...
Claims
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IPC IPC(8): F16C35/00
Inventor凌四营王立鼎王晓东娄志峰李军贾颖
Owner金齿传动科技(大连)有限公司