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A copper-based powder metallurgy friction material for wet synchronizer rings

A technology of powder metallurgy and friction materials, which is applied in the field of automobile friction materials, can solve the problems of not finding the anti-overload capacity of materials, not finding the ratio of static and dynamic friction coefficients, and protection content against extreme pressure loads, so as to improve the utilization of materials rate, stable friction coefficient, and improved wear resistance

Active Publication Date: 2019-11-26
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the claims of the queried patent, no protection content was found for the ratio of static and dynamic friction coefficients and extreme pressure load resistance, especially the relevant content about evaluating the overload resistance of materials by using the step loading method

Method used

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  • A copper-based powder metallurgy friction material for wet synchronizer rings
  • A copper-based powder metallurgy friction material for wet synchronizer rings
  • A copper-based powder metallurgy friction material for wet synchronizer rings

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The powder mixing operation is carried out according to the following components and proportions: 2.31% graphite, 1.96% Al, 0.57% SiO 2 (Natural quartz sand), 0.71% Fe, 4.21% Mo, 2.89% Sn, 2.37% W, 11.71% Zn, and the rest is Cu. The mixture was pressed and formed at 390 MPa, and pressure sintered together with the steel back. The sintering temperature was 870° C., the sintering pressure was 2.3 MPa, and the holding time was 2.5 hours.

[0040] like figure 2 The density of the copper-based powder metallurgy friction material obtained by the above method is shown as 5.1g / cm 3 , the hardness is (187~198) HV0.025,

Embodiment 2

[0042] The powder mixing operation is carried out according to the following components and proportions: 3.39% graphite, 1.68% Al, 0.86% SiO 2 (Natural quartz sand), 1.02% Fe, 5.62% Mo, 1.95% Sn, 3.68% W, 13.19% Zn, and the rest is Cu. The mixture was pressed and formed at 400 MPa, and pressure sintered together with the steel back. The sintering temperature was 900° C., the sintering pressure was 2.5 MPa, and the holding time was 3.0 hours.

[0043] The density of the copper-based powder metallurgy friction material obtained by the above method is 5.3g / cm 3 , the hardness is (196~205) HV0.025.

Embodiment 3

[0045] The powder mixing operation is carried out according to the following components and proportions: 2.89% graphite, 2.23% Al, 1.03% SiO 2 (Natural quartz sand), 0.97% Fe, 4.69% Mo, 2.32% Sn, 3.75% W, 14.51% Zn, and the rest is Cu. The mixture was pressed and formed at 420 MPa, and pressure sintered together with the steel back. The sintering temperature was 880° C., the sintering pressure was 2.6 MPa, and the holding time was 3.5 hours.

[0046] The density of the copper-based powder metallurgy friction material obtained by the above method is 5.4g / cm 3 , the hardness is (203~212) HV0.025.

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Abstract

The invention relates to a copper-based powder metallurgy friction material for a wet synchronizer gear ring, which is characterized in that it includes the following components, wherein the content of each component is expressed in weight percentage: 2.0-4.0% graphite, 1.5-2.5% Al, 0.2‑1.3%SiO 2 , 0.5-1.5%Fe, 3.5-6.5%Mo, 1.5-3.5%Sn, 2.0-5.0%W, 12.0-15.0%Zn, and the rest is Cu; the specific process is as follows: mix according to the above components and proportions Powder and pressing, the pressed copper-based powder metallurgy friction material is sintered with the steel back, and finally installed on the working cone of the synchronous ring. The friction material uses Cu as the matrix, adds Al, Mo, W and other elements, and optimizes the composition ratio. After powder mixing and pressing, it is sintered with the steel back and installed on the working cone surface of the synchronous ring. The friction of the material The mechanical properties are superior to traditional brass alloys, and have good application prospects.

Description

technical field [0001] The invention relates to a copper-based powder metallurgy friction material for a wet synchronizer gear ring, belonging to the technical field of automobile friction materials. Background technique [0002] The synchronizer ring is a key component of the automobile transmission system. The synchronizing ring is installed in the synchronizing sleeve, figure 1 It is a schematic diagram of the parts of the synchronizing ring. Its working principle is mainly: when the transmission shifts, the shifting fork drives the engaging sleeve to approach the tooth to be engaged, and the inner cone surface of the synchronizing ring contacts the outer conical surface of the ring gear to be engaged to generate friction. The engaging sleeve and the teeth to be engaged are quickly synchronized, avoiding the direct contact of gears with different rotational speeds, and completing the smooth shifting. At present, most of the synchronizers on the market are wet type. In o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/04B22F1/00C22C1/05B22F5/08
CPCC22C1/05C22C9/04B22F5/08B22F1/105
Inventor 李文平柳超张薇李波邓飞
Owner CHINA FIRST AUTOMOBILE
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