An externally-embracing belt-type floating gear shift brake

Abstract

The invention discloses an external belt-type floating gear shift brake, which includes a brake belt, a floating belt tooth, a spring, a brake drum, a limit mechanism, a self-locking device and a driving mechanism; when the brake is not working, two The movable ends of the two brake bands are in a separated state, the floating belt teeth are in a disengaged state from the brake drum teeth, and the spring is in a stretched state; when the brake is applied, the two sets of driving mechanisms drive the movable ends of the two brake bands to face each other synchronously. Movement, so that the floating belt teeth mesh with the brake drum teeth, and the floating belt teeth move along the circumferential direction of the brake belt under the drive of the brake drum teeth. Locked by the self-locking device, the reverse movement of the floating tooth is restricted; when the self-locking device is unlocked, the floating tooth returns under the action of the spring. The invention can ensure that all the belt teeth can mesh with the brake drum teeth during braking, and can avoid the problems of uneven distribution of braking torque of each tooth and excessive stress of local parts caused by incomplete meshing of teeth during collision.

Description

technical field [0001] The invention relates to the technical field of vehicle transmission, in particular to an outer-embracing belt-type floating tooth-shaped shift brake. Background technique [0002] The currently developed electric drive tracked vehicles are limited by the motor and battery technology. In order to meet the technical requirements for the dynamic performance of tracked vehicles, the motors equipped with tracked vehicles need to be equipped with a two-speed planetary gearbox. The purpose of slope and higher maximum speed, and to reduce the burden on the motor and battery, can make the motor continue to work in the optimal efficiency range, and improve the power and economy of the electric drive tracked vehicle. Traditional planetary gearboxes for tracked vehicles usually use a wet friction plate shift mechanism. The active and passive friction plates are pressed by a hydraulic device, and the friction torque between the friction plates is used to brake the...

AI Technical Summary

Problems solved by technology

[0004] However, in the actual use process, the above-mentioned scheme still has certain problems in terms of work reliability, etc., and the feasibility is poor.

First of all, the use of externally embracing symmetrical belt-shaped brakes cannot completely eradicate the problem of non-full tooth meshing during the braking process. The central angles of the brake drum teeth are not completely equal. If the brake band teeth have collided with the brake drum before the brake band has moved to the final position, the problem of incomplete tooth meshing will also occur.

Non-full tooth meshing will greatly increase the stress of the contact meshing parts, which not only makes the braking mechanism unable to bear the force balance, but also increases the burden on the connecting parts of the braking mechanism, and cannot realize the reliability and stability of the braking process, affecting the reliability of the braking parts. Work reliability and service life, even directly damage the brake parts

[0005] For the screw nut mechanism with rolling screw transmission, its structure is complex, the manufacturing precision is high, and the impact resistance is poor

In this structure, the top of the brake band needs to be kept fixed by the screw nut mechanism, and although the brake teeth and the elastic gear sleeve absorb a large amount of braking impact energy during the braking process, the impact torque generated by the collision of the brake teeth cannot be avoided. Excessive shear force will be caused to the lead screw, which will easily cause the lead screw to bend and deform

Once the lead screw is deformed, it will greatly affect the accuracy of the movement of the actuator, and it is more likely to cause the brake actuator to fail

Therefore, the actuator directly driven by the screw nut will further limit the working reliability of the brake.

[0006] To sum up, although the above scheme has made some progress compared with the existing technology, there are still problems that cannot be ignored, and directly affect the working performance and service life of the brake, and there is a certain distance from the actual use. Therefore, the above It is necessary to optimize and improve the defects

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