Method for testing skip change of worm wheel and worm fit friction coefficient of automobile steering system

Abstract

The invention discloses a method for testing the skip change of a worm wheel and worm fit friction coefficient of an automobile steering system. The method comprises the steps of (1) arranging a worm wheel assembly on a worm wheel fixing device in a rotatable manner, arranging a worm assembly on a worm fixing device in a rotatable manner, and meshing the worm assembly with the worm wheel assembly; (2) applying pressure F on the worm assembly to rotate the worm assembly; (3) measuring a rotating torque T of the worm assembly; (4) calculating the worm wheel and worm fit friction coefficient; (5) drawing a skip change curve graph of the worm wheel and worm fit friction coefficient. A conventional friction coefficient test method is applied to testing the skip change of a friction pair of worm wheel and worm fit of a speed reducing mechanism of a tubular column type electric steering system; the method is simple and practical and is low in cost; during design of an early speed reducing structure, problems can be found by the providing of the test method, so that mechanical noise generated by a worm wheel and a worm can be avoided in advance; therefore, the cost and the period for changing the design in the later stage can be reduced.

Description

technical field [0001] The invention belongs to the technical field of automobiles. Specifically, the invention relates to a method for testing the jumping change of the friction coefficient of a column-type electric steering system reduction mechanism of a worm gear and a worm. Background technique [0002] With the development of the automobile industry, the traditional hydraulic steering system is used less and less. In order to improve the handling performance and comfort of the vehicle, as well as reduce the fuel consumption of the vehicle, more and more vehicles use the electric steering system, and the current More than half of the electric steering system adopts column electric steering system. [0003] The worm gear of the deceleration mechanism of the column-type electric steering system is easy to produce mechanical noise. As customers have more and more stringent requirements for vehicle comfort, if the mechanical noise of the vehicle steering system components i...

AI Technical Summary

Problems solved by technology

[0003] The worm gear of the deceleration mechanism of the column-type electric steering system is easy to generate mechanical noise. As customers have more and more stringent requirements for vehicle comfort, if the mechanical noise of the vehicle steering system components is not well controlled, it will cause customer complaints In severe cases, it may even affect customers' purchase choices of vehicle brands, leading to a decline in vehicle sales and affecting corporate profits

[0004] The worm gear and worm gear of the column type electric steering system are easy to produce mechanical noise. The mechanism of the noise mainly includes the following situations: 1. The processing of the parts of the worm gear and worm itself does not meet the design requirements, and the fit clearance does not meet the design requirements. ; 2. The axial coincidence degree of worm gear and worm is poor; 3. The surface of worm gear and worm is easy to wear and has burrs on the surface; 4. The grease applied between the worm gear and worm has poor performance and has not played its due role. lubrication

The detection of the above four mechanisms can be found through the worm gear of the reduction mechanism in conjunction with the change of the friction coefficient jump. If there is a problem, the friction system will have a relatively large jump, and even abnormal changes will occur.

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