A transmission differential impact strength and fatigue analysis method

Abstract

The invention discloses an impact strength and fatigue analysis method of a transmission differential. The impact strength and fatigue analysis method comprises three parts including a pretightening force method of a cone bearing along with temperature, a circumferential 20-bisection and impact strength analysis method of the differential and a fatigue life analysis method. Since transient stress generated by actually rotating a differential shell for one circle is difficult through an analogy method, the impact strength and fatigue analysis method uses a method that the engaging position of a main-reduction gearwheel is bisected into 20 parts circumferentially to combine quasi-static analysis results to obtain a transient stress course that the differential shell rotates for one circle, so that the transient stress generated by actually rotating the differential shell for one circle is simulated, each torque level of a finished automobile load spectrum and a corresponding rotation circle number are combined, linear scaling is carried out on a stress analysis result according to a load ratio of load to stress analysis, finally, the fatigue loss of each torque level is finally overlapped, and fatigue endurance life in a differential shell working process, i.e., under the load spectrum, is calculated. The defect that differential shell is subjected to over design or the service life can not meet a practical working condition can be solved.

Description

technical field

[0001] The invention relates to a method for analyzing the impact strength and fatigue of a transmission differential. Background technique

[0002] In the traditional differential design and strength check, it is difficult to find an effective impact strength and fatigue analysis method under the load spectrum of the whole vehicle, so the differential housing may be over-designed or its life cannot meet the actual working conditions Work requirements. It is urgent to design a fatigue analysis method that can cover the actual working state of the differential and is based on the load spectrum of the whole vehicle. Contents of the invention

[0003] The purpose of the present invention is to provide a new method for impact strength and fatigue analysis of a transmission differential, which overcomes the shortcomings of the traditional differential design that the differential housing is over-designed or the service life cannot meet the actual working condit...

Examples

Embodiment Construction

[0008] The present invention will be further described now in conjunction with accompanying drawing:

[0009] A transmission differential impact strength and fatigue analysis method, the specific implementation method is divided into three parts, respectively, the preload method of the tapered bearing with temperature, differential circumferential 20 equal parts and impact strength analysis method and fatigue life analysis method:

[0010] The first part, the preload method of tapered bearing with temperature. Due to the inconsistency of the materials of the differential case, the tapered bearing and the transmission case, their thermal expansion coefficients are different, resulting in the change of the preload of the tapered bearing with the change of temperature. The invention establishes the finite element model of the relevant parts of the cone bearing, the differential case and the transmission case, and sets "contact" for the assembly relationship to ensure the transmi...

technical field

[0001] The invention relates to a method for analyzing the impact strength and fatigue of a transmission differential. Background technique

[0002] In the traditional differential design and strength check, it is difficult to find an effective impact strength and fatigue analysis method under the load spectrum of the whole vehicle, so the differential housing may be over-designed or its life cannot meet the actual working conditions Work requirements. It is urgent to design a fatigue analysis method that can cover the actual working state of the differential and is based on the load spectrum of the whole vehicle. Contents of the invention

[0003] The purpose of the present invention is to provide a new method for impact strength and fatigue analysis of a transmission differential, which overcomes the shortcomings of the traditional differential design that the differential housing is over-designed or the service life cannot meet the actual working condit...

Examples

Embodiment Construction

[0008] The present invention will be further described now in conjunction with accompanying drawing:

[0009] A transmission differential impact strength and fatigue analysis method, the specific implementation method is divided into three parts, respectively, the preload method of the tapered bearing with temperature, differential circumferential 20 equal parts and impact strength analysis method and fatigue life analysis method:

[0010] The first part, the preload method of tapered bearing with temperature. Due to the inconsistency of the materials of the differential case, the tapered bearing and the transmission case, their thermal expansion coefficients are different, resulting in the change of the preload of the tapered bearing with the change of temperature. The invention establishes the finite element model of the relevant parts of the cone bearing, the differential case and the transmission case, and sets "contact" for the assembly relationship to ensure the transmi...

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