| The high-speed railway has the advantages of high operating time,high transportation capacity,low energy consumption,small area and small area,and plays a vital role in the national economy,people’s lives,and national security.The brake system is the key system for the safe operation and emergency support of high-speed trains,which is directly related to the operational safety of trains.At present,the world’s high-speed train base brakes are mostly driven by disc friction and consist of brake discs and brake pads.The frictional brakes consume the kinetic energy of highspeed trains,thus achieving the purpose of braking.It is one of the necessary conditions to ensure the safe operation of trains by developing brake pads that are safe and reliable under high-speed conditions.Therefore,it is necessary to design a suitable friction block and the installation of the steel back to ensure that the friction block is in good contact with the brake disc during the braking process,and the braking force is evenly distributed to avoid the friction and force of the friction block during the braking process of the brake disc.Uneven,ensuring the stability of the braking process.The main research work and results completed in this paper are as follows:The composition and performance requirements of the high-speed rail brake system are analyzed.The design parameters of the brake disc are obtained.Through the experiment and analysis of the brake disc,it is clear that the ball and socket pair has a certain automatic adjustment function,and the ball socket is analyzed.The principle of adaptive adaptation of the pair and the butterfly spring provides a reference for the self-designed contact friction adaptive brake pad.2.Four brake pad structure design schemes are proposed,and parts design,assembly inspection and stress analysis are carried out for each scheme.In the first scheme,the butterfly spring is introduced to make the maximum adjustment angle of the friction block 0.97°;in the second scheme,a ball and socket pair is designed,so that the brake pad can be adjusted in the radial direction by 1.6°;the third option is to add the adjuster structure,and the single adjustment can be simultaneously adjusted.Friction block and three sets of friction block plane,the maximum adjustment angle of the friction block is 1.89°;scheme 4 introduces the butterfly spring and adjuster at the same time,the steel back is elastically connected with the friction block adjuster,and the adjustment range is up to the adjustment angle of 3.23°..3.Using ADAMS software to simulate and simulate the braking process under actual working conditions,the dynamic analysis of the four designed schemes is carried out separately.The results show that the friction block can be automatically adjusted automatically during the braking process,so that it has good contact with the brake disc and uniform force,and the contact adaptive function is better realized.4.The effects of different butterfly spring stiffness,ball and socket diameter,and friction block shape on the braking process are analyzed.The results show that when the stiffness of the butterfly spring is 4558N/mm,the friction block has good contact with the brake disc,and the contact friction adaptability is good.When the ball and socket sub-radius r is 20 mm,the friction block is in good contact with the brake disc.The contact friction is more adaptable.The designed pentagon friction block(one side is an elliptical side)has a better fit with the brake disc than the other friction blocks,which makes the braking more stable. |
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