Parking and braking mechanism of automobile gear box

Abstract

The invention discloses a parking and braking mechanism of an automobile gear box, which mainly comprises a parking gear wheel, a parking ratchet, an actuating rod, a slipping spring, a cam slide block, a plurality of support pins, an intermediate moving rod and a positioning track plate, wherein the cam slide block is connected at the front end of the actuating rod and does slipping connection with the rear end of the parking ratchet under the function of precompression force of the slipping spring; the actuating rod is connected on the intermittent moving rod; and the positioning track plate is connected with the intermittent moving rod when in shift P and shift R, and is disconnected from the intermittent moving rod when in shift N and shift D. When in shift P, the parking ratchet is pushed to the parking gear wheel by the driving pin on the positioning track plate through the intermittent moving rod, the actuating rod, the slipping spring and the cam slide block, and then the gear box is braked. By arranging the support pins and the intermittent moving rod, the slipping speed and control precision of the parking and braking mechanism can be enhanced, and the service life of the braking mechanism is prolonged through the slipping connection of linear contact.

Description

technical field [0001] The invention relates to an automobile parking brake device, in particular to a parking brake mechanism for an automobile transmission. Background technique [0002] Automobile automatic transmissions generally have at least four gears of D gear, N gear, R gear and P gear. Compared with manual transmission, P gear is an added gear of automatic transmission. When the shift lever is moved to the "P" position, the parking brake mechanism locks the gearbox mechanically. One of its functions is to ensure that the vehicle does not move. Pushing into the P position by mistake, the brake mechanism can allow the gearbox to rotate (slip). This slipping function of the parking brake mechanism can ensure that the gearbox will not be automatically locked when the vehicle speed exceeds a certain speed (about 8km / hr), thereby effectively preventing damage to the car transmission system caused by sudden locking of the gearbox. damage. [0003] The patent No. is US5...

AI Technical Summary

Problems solved by technology

Through the parking brake mechanism provided, when the actuating lever enters or exits the parking state, the cam slider on it slides in line contact with the plurality of supporting pins, which reduces the wear between parts and solves the problem of In the prior art, the cam slider and the cam master are in point contact and slide, which is easy to wear and have a short service life. At the same time, the cam master with high precision requirements and difficult processing described in the background technology is removed, which reduces the manufacturing cost.

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