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Two-way positioning small stress assembly structure and its assembly method

A technology of two-way positioning and assembly structure, applied to the rigid bracket of bearing components, manufacturing tools, mechanical equipment, etc., can solve the problems of poor reliability and stability, cracked shaft sleeve, limited application, etc., to improve reliability and assembly. Small stress, the effect of preventing relative sliding

Inactive Publication Date: 2018-11-23
HEBEI TAIMING INVESTMENT GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 2. This method limits the application of some materials
Such as materials with poor toughness, it is easy to crack or the shaft sleeve moves relatively after assembly
[0010] 3. Poor reliability and stability when running after assembly

Method used

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  • Two-way positioning small stress assembly structure and its assembly method
  • Two-way positioning small stress assembly structure and its assembly method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Determine the fit curve form according to the transfer torque: preferably a standard elliptic curve. The major axis of the ellipse is 1003mm, and the minor axis is 1000mm;

[0056] (2) Determine and calculate the interference amount according to the assembly datum: the interference amount is 0.25mm, the section curve of the shaft is also a standard ellipse curve, the tolerance range: 0~+0.05, the section curve of the shaft sleeve is the same as the standard ellipse in step 1 Curve, tolerance range: -0.05~0;

[0057](3) Determine the diameter and length of the stop step on the shaft. The diameter of the stop step is 1.2mm offset from the major axis of the elliptic curve, that is, 1004.2mm, and the length of the stop step is 100mm;

[0058] (4) Determine the diameter and length of the anti-retraction groove in the inner hole of the shaft sleeve that matches the anti-retreat step. Among them, the diameter of the stop groove is 1004.5mm and the length is 104mm;

[0...

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Abstract

The invention discloses a bidirectional-positioning small-stress assembly structure. The bidirectional-positioning small-stress assembly structure comprises a shaft and a shaft sleeve, wherein a fit part of the shaft and the shaft sleeve is positioned between a retaining step and a positioning step at the two ends; and the shaft and the shaft sleeve are in noncircular-curve interference magnitude fit, for example standard elliptical-curve interference magnitude fit. The assembly interference magnitude of the shaft and the shaft sleeve accounts for 0.02%-0.03% of an assembly diameter; a retaining groove and a positioning groove are formed in the shaft sleeve respectively; the retaining groove and the positioning groove are fitted with the retaining step and the positioning step respectively; the diameter of the retaining step is 1.0025 times that of the assembly diameter (a long shaft); the assembly interference magnitude between the retaining step and the retaining groove is 0.02%-0.03%; and the length of the retaining step accounts for 10% of the shaft sleeve fit length, and the length of the retaining groove is 1.04 times that of the retaining step. The bidirectional-positioning small-stress assembly structure can be positioned in a bidirectional mode to prevent the shaft and the sleeve from relative axial movement; moreover, the assembly stress is small, the shearing stress is gentle, and relative sliding between the shaft and the sleeve is avoided; and the reliability and the stability of operation after assembly are greatly improved.

Description

technical field [0001] The invention belongs to the field of mechanical design and assembly, and specifically designs a two-way positioning small stress assembly structure and an assembly method thereof. Background technique [0002] In the prior art, the bushing assembly method for transmitting large torque is mostly heat-fitting with large interference. Its operation method includes the following steps: [0003] 1. First select the perfect circular curve as the matching curve, and the interference amount is selected between 0.9 and 1.2‰ of the diameter; [0004] 2. Then determine the diameter and tolerance of the shaft and the diameter and tolerance of the sleeve according to the international tolerance standard; [0005] 3. Refinish the shaft and sleeve; [0006] 4. Heat the sleeve to about 280°C and keep it warm for a certain period of time. After the cover is taken out, operate according to the assembly sequence. [0007] There is a problem with the existing assemb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C35/02B23P11/02
Inventor 王文祥
Owner HEBEI TAIMING INVESTMENT GRP
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