Traction spherical hinge for rail vehicles and rigidity design method of traction spherical hinge

Abstract

A traction spherical hinge for rail vehicles comprises a case, a mandrel and a rubber layer bonded between the case and the mandrel through vulcanization. The traction spherical hinge is characterized in that the middle section of a bonding part for the mandrel and the rubber layer is an arc surface bulge bulging outwards in the radial direction, the center line of the arc surface bulge coincides with that of the mandrel, the deformation profile of the rubber layer is a convex arc surface gradually getting close to the inner wall of the case from outside to inside in the axial direction, the arc radius of the deformation profile is R1, the arc radius of the arc surface bulge is R2, and R1 is smaller than R2. Rigidity adjustment can be performed on the axis, diameter, deviation and torque of the spherical hinge can be realized, and the non-linear rigidity characteristics and fatigue resistance of the spherical hinge in the bearing process can be improved. The invention further provides a rigidity design method of the traction spherical hinge for the rail vehicles.

Description

technical field [0001] The invention relates to a traction ball joint for rail vehicles and a stiffness design method thereof, belonging to the technical field of rail vehicle elastic components. Background technique [0002] The ball joint is a commonly used rubber-metal composite vibration damping and connecting element. Its main function is to connect the car body and the frame. [0003] The original that can transmit force and provide multi-directional cushioning. The metal parts and rubber are vulcanized into a whole under certain temperature and pressure through the adhesive. [0004] With the increase of rail vehicle lines, the operating conditions of each line are not the same. The defects of the existing spherical joints are: [0005] 1. Different operating conditions have different requirements for the stiffness of the ball joint during the loading process. In order to better meet the dynamic requirements and safety of the vehicle, the ball joint requires its r...

AI Technical Summary

Problems solved by technology

[0005] 1. Different operating conditions have different rigidity requirements for the ball joint during the loading process. In order to better meet the dynamic requirements and safety of the vehicle, the ball joint requires its radial, axial, deflection and torsional stiffness. It meets the load-bearing requirements of the operating conditions, but the structure of the existing spherical joint is difficult to adjust the four rigidities of the spherical joint according to the load-bearing requirements of the operating conditions

[0006] 2. The rubber profile in the ball joint adopts an inwardly recessed U-shaped structure, which is prone to wrinkle cracking and extrusion cracking under heavy loads, and has a short fatigue life.

[0007] 3. The nonlinear stiffness characteristics of the spherical joint in the bearing process are not high, which cannot meet the nonlinear stiffness requirements under large loads

In this solution, the length of the rubber gradually increases from the side that is in contact with the jacket to the side that is in contact with the mandrel. When compressed, the side of the rubber layer will not form wrinkles, but will be close to the jacket to reduce the amount of rubber. layer cracking and wrinkling, but this scheme does not give how to improve the four stiffness and nonlinear stiffness characteristics of the spherical joint according to the load-bearing requirements

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