Inner cone ring of heavy truck gear box synchronizer and manufacturing process thereof

Abstract

The invention discloses an inner cone ring of a heavy truck gear box synchronizer and a manufacturing process thereof. The substrate is a power metallurgy material which is prepared from the following raw material components in percentage by weight: 0.5-5% of copper powder, 0.1-1.5 % of graphite powder, 0.1-1.5 % of free cutting agent, 0.2-2% of lubricating agent, 0.01-1.5% of bonding agent, and the balance of 88.5-99.09% of iron powder. The manufacturing process of the inner cone ring has the following steps: materials mixing, forming, sintering, auxiliary machinery processing, vapor treatment, and bonding. According to the invention, powder metallurgy process is adopted, and wicking treatment is carried out in the sintering process, thus the intensity at the position born greater stressof the outer cone ring blank is improved prominently, and using performances of products in the synchronizer are increased; and the process is simple and reliable, the production efficiency is high, the material utilization ratio is high, and inner cone ring products which are manufactured in bulk have the advantages of stable quality, high intensity, high manufacturing accuracy, low manufacturing cost and the like.

Description

technical field [0001] The invention belongs to the technical field of heavy-duty truck gearbox parts manufacturing, and in particular relates to an inner cone ring used in a double countershaft gearbox sub-box synchronizer and a manufacturing process thereof. Background technique [0002] There is a pin-type inertia synchronizer in the sub-box of the double countershaft gearbox for heavy trucks. Its function is to make the two gears with a certain speed difference The rotating bodies are quickly synchronized for easy gear shifting. [0003] The locking pin type automobile synchronizer includes an inner cone ring and an outer cone ring located on both sides of the sliding gear sleeve. One side of the inner cone ring is fixedly connected with 3 high-speed locking pins, and one side of the outer cone ring is fixedly connected with 3 The low gear locking pin and the sliding gear sleeve are respectively provided with pin holes corresponding to the locking pins of the inner cone...

AI Technical Summary

Problems solved by technology

[0005] (1) Due to the complex shape of the inner cone ring, sometimes machining is difficult or even impossible, and the material utilization rate is low, so it is difficult to achieve mass production of inner cone ring products with stable quality. Cast iron materials also cause product strength due to uneven material composition Locally too low, there is a risk of breakage during use

[0006] (2) After the inner cone ring blank is processed to the finished product, there are 3 holes distributed on its end surface, and the 3 locking pins are fitted in these 3 holes by interference pressing. Due to the density difference and material If the strength is too low, the holding force of the body to the locking pin is too low. During use, the locking pin may fall off from the body or the locking pin may be broken, which will seriously affect the function and service life of the synchronizer and even the gearbox.

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