Metal reinforced retainer for main shaft bearing of liquid oxygen pump and preparation process of metal reinforced retainer

Abstract

The invention relates to a metal reinforced retainer for a liquid oxygen pump main shaft bearing and a preparation process thereof, the retainer comprises a plurality of retainer blocks, a fixing ring and a rivet sleeve, each pocket is composed of two adjacent retainer blocks, two sides of each retainer block are respectively provided with a convex positioning structure, and each convex positioning structure is provided with a convex groove. Limiting grooves matched with the convex positioning structures in shape are evenly formed in the end faces of the fixing rings in the circumferential direction, the fixing rings are arranged on the two sides of the multiple retainer blocks and connected with the convex positioning structures in a matched mode through the limiting grooves in the fixing rings, and the rivet sleeves are installed in rivet holes of the retainer blocks respectively. And a plurality of rivet rods are used for fixing. According to the scheme, the influence of the large linear expansion coefficient of a polytetrafluoroethylene material on the guide gap of the guide flange of the retainer and the gap between the pocket and the steel ball can be avoided, the structural stability, reliability and high-speed performance of the retainer at low temperature are guaranteed, the retainer can be suitable for the low-temperature and high-speed working conditions of the liquid oxygen pump, and meanwhile the weight of the retainer can be reduced as much as possible.

Description

technical field [0001] The invention relates to the technical field of bearing design, and mainly relates to a large-size three-point contact ball bearing used in liquid oxygen environment and high-speed working conditions, in particular to a metal reinforced cage for a main shaft bearing of a liquid oxygen pump and a preparation process thereof. Background technique [0002] A certain type of three-point contact ball bearing used for the main shaft of the spacecraft liquid oxygen pump, the inner diameter is 120mm, the outer diameter is 215mm, and the dn value reaches 2.3×10 6 . When the bearing is working, it is immersed in liquid oxygen at -192℃~-143℃, and the liquid oxygen provides lubrication and cooling. The cage is an important part of the bearing. The PTFE material has been used as a cage material in some small-sized bearings for liquid oxygen pumps due to its high temperature resistance, low temperature resistance, corrosion resistance and other advantages, and its ...

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Problems solved by technology

However, for larger bearings, taking a bearing with an inner diameter of 120mm as an example, the radial dimension reduction of the PTFE cage is not less than 1mm, which will seriously affect the clearance between the cage and the rib, thus affecting the stable rotation of the cage In severe cases, it may even lock to the rib of the inner ring; the size of the pocket hole is reduced by about 0.16mm, which reduces the gap between the pocket hole and the steel ball, which is not conducive to heat dissipation and high-speed performance. hold to death

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