A kind of running-in test method of hydraulic automatic transmission

A technology of automatic transmission and test method, applied in the direction of machine gear/transmission mechanism testing, etc., can solve problems such as damage to the tested hydraulic automatic transmission, achieve the effects of reducing the probability of damage, improving strength, and prolonging the running-in time

Active Publication Date: 2015-08-26
SPECIAL VEHICLE TECH CENT OF HUBEI AEROSPACE TECH RES INST
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This method directly sets the input shaft speed of the tested hydraulic automatic transmission to the rated speed during running-in, which may easily cause damage to the tested hydraulic automatic transmission

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  • A kind of running-in test method of hydraulic automatic transmission

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Embodiment Construction

[0018] The technical solutions of the present invention will be further specifically described below in conjunction with the accompanying drawings and specific embodiments.

[0019] The embodiment of the present invention provides a hydraulic automatic transmission running-in test method. The hydraulic automatic transmission used for the test is used for a heavy-duty truck. It has 6 forward gears and a maximum speed of 2000r / min. , the matching engine is a 400-horsepower diesel engine with an idle speed of 600r / min and a maximum speed of 2000r / min. The running-in test is carried out on the hydraulic automatic transmission test bench, such as figure 1 Shown flow chart, comprises the following steps:

[0020] Use the hydraulic oil automatic filling / draining system including the oil storage tank and the oil filling / draining device recorded in the patent application 201220620187.1 to fill the hydraulic automatic transmission with working oil, and make the working oil full of the ...

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Abstract

The invention relates to a running-in test method of an automatic hydrodynamic transmission. The running-in test is conducted on a test stand of the automatic hydrodynamic transmission. The running-in test method of the automatic hydrodynamic transmission comprises the following steps that the automatic hydrodynamic transmission is filled with operating oil, braking of an output shaft and a variable frequency motor are started to drive a hydrodynamic torque converter to stir the operating oil to produce friction and be preheated, the temperature of the operating oil is made to reach 90+ / -10 DEG C, the automatic hydrodynamic transmission is set to be in a manual shifting mode, an output shaft braking system is loosened after gears are engaged, the running-in test is performed on each gear, the input revolving speed under each gear is gradually increased at equal intervals from the idling revolving speed of an engine matched with the automatic hydrodynamic transmission to the rated speed of the engine, and test data are recorded. As metal filings remained in the hydrodynamic torque converter when machining is conducted are removed through the running-in, and machining marks on each friction surface are polished, smooth operation of the running-in test under the high gear and high revolving speed is ensured effectively, breakdown of the transmission can be found timely, and probability of damage to the automatic hydrodynamic transmission is reduced.

Description

technical field [0001] The invention belongs to the technical field of hydraulic automatic transmissions, and in particular relates to a running-in test method of hydraulic automatic transmissions. Background technique [0002] The hydraulic automatic transmission is mainly composed of a hydraulic torque converter, a planetary gear gearbox, a hydraulic shift control mechanism and an electronic control unit, including shafts, hubs, gears, casings, sealing rings and hydraulic valves, etc. Components, which are core components of high-precision power transmission, have high requirements for machining, heat treatment, sealing, positioning and assembly. [0003] After the assembly of the hydraulic automatic transmission is completed, before the official delivery, in order to ensure the normal and stable operation of each fitting, a period of running-in test is required to polish the processing marks on each friction surface and make them more tightly bonded, and at the same time ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/02
Inventor 王征艾银华向雪峰周谊张波
Owner SPECIAL VEHICLE TECH CENT OF HUBEI AEROSPACE TECH RES INST
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