Technical method for near-net shaping forging of excircle flats and end surface hyperbolic oil grooves of half axle gear journal

Abstract

The invention relates to a technical method for the near-net shaping forging of excircle flats and end surface hyperbolic oil grooves of a half axle gear journal of a differential. The excircle flats and the end surface hyperbolic oil grooves of the half axle gear journal, after being shaped through one quenching and two forging, are no longer needed to be machined through milling and turning. Therefore, the efficiency is improved, raw materials are reduced, cutter consumption is reduced, and total cost spent on manufacturing the product with the flats on the excircle and the hyperbolic oil grooves on the end surfaces for the half axle gear journal of the differential is reduced. The technical method has the advantages that the efficiency is high, and raw materials, cutter consumption and manufacture cost are reduced.

Description

technical field [0001] The invention belongs to the field of die forging, and in particular relates to a nearly net-shape forging method for a shaft gear journal with a flat outer circle and a hyperbolic oil groove on an end face. Background technique [0002] The differential planetary and half-shaft straight bevel gears are the key parts in the vehicle transmission system. Regardless of the vehicle's double-stage bridge or single-stage bridge, there are one or several sets of differential planetary, semi- Shaft straight bevel gears play a vital role in the transmission system; in order to ensure that the differential spur bevel gears are in good working condition during meshing rotation, the gap between the gear mounting surface and the differential housing Lubrication is extremely important. Different axle manufacturers have adopted different methods, either adding a helical oil groove on the journal of the axle gear or milling and flattening the outer circle of the journ...

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Problems solved by technology

[0002] The differential planetary and half-shaft straight bevel gears are the key parts in the vehicle transmission system. Regardless of the vehicle's double-stage bridge or single-stage bridge, there are one or several sets of differential planetary, semi- Shaft straight bevel gears play a vital role in the transmission system; in order to ensure that the differential spur bevel gears are in good working condition during meshing rotation, the gap between the gear mounting surface and the differential housing Lubrication is extremely important. Different axle manufacturers have adopted different methods, either adding a helical oil groove on the journal of the axle gear or milling and flattening the outer circle of the journal, or adding an eccentric annular oil groove or two on the installation datum surface. A symmetrical hyperbolic oil groove, a single spiral oil groove on the journal and an eccentric annular oil groove on the installation reference plane are not difficult to process, and the processing efficiency is not low; the low processing efficiency is the addition of Symmetrical two or four flats, the more difficult to process is the two symmetrical hyperbolic oil grooves on the installation datum surface, which must be clamped twice and their symmetry must be guaranteed. If the same half shaft gear is encountered, the outer shaft The neck needs to be milled and flattened, and two symmetrical hyperbolic oil grooves need to be processed on the installation datum surface, which is even more difficult and the efficiency is extremely low. The cost-effective forging method of the shaft gear journal with flat outer circle and hyperbolic oil groove on the end face is of great significance

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