Electric vehicle parking device

Abstract

The invention relates to an electric vehicle parking device. When a vehicle is parked, a motor is operated forwards, power of the motor is decelerated through a worm, a worm gear, a screw and a pushing rod and used for pushing a belleville spring and a taper ring, the acting force of the spring is gradually overcome by a pawl pushed by the taper ring, so that the pawl is pushed to rotate towards a ratchet wheel, a single tooth arranged on the pawl is meshed with a toothed groove formed in the ratchet wheel, and therefore the vehicle is parked. When the vehicle is relieved, the motor is operated in the opposite direction, the power of the motor is decelerated through the worm, the worm gear, the screw and the pushing rod, so that the pushing force of the belleville spring and the pushing force of the taper ring are eliminated, the pawl rotates in the direction far away from the ratchet wheel under the acting force of the spring, the single tooth arranged on the pawl is separated from the toothed groove in the ratchet wheel, and therefore the vehicle is relieved. According to the electric vehicle parking device, the structure is simple, an ignition switch is used for sending a switching signal, interference of a driver is not needed in the parking process, and a parking brake is made to work automatically, so that the parking and braking effect is achieved, operation behaviors of the driver are reduced, operation is smooth, and work is reliable.

Description

technical field [0001] The invention relates to a parking device for an electric vehicle, which belongs to the technical field of vehicle transmission devices. Background technique [0002] As the core component of new energy electric vehicles, the electric vehicle reducer not only has high standards for its appearance, noise, safety, etc., but also has stricter requirements for its performance; currently, the types of new energy reducers are There are many kinds of gearboxes. There are more or less deficiencies in the gearbox. Most electric vehicles use front-wheel drive, and the parking brake is to perform frictional braking on the rear wheels. During the parking process, the handbrake is often not pulled in place. , leading to a small braking force, and the wheels cannot be completely locked; especially when the electric vehicle is parked on a slope, the friction parking brake is used, and the hand brake is used alone, and the vehicle may slide due to not being completely...

AI Technical Summary

Problems solved by technology

[0002] As the core component of new energy electric vehicles, the electric vehicle reducer not only has high standards for its appearance, noise, safety, etc., but also has stricter requirements for its performance; currently, the types of new energy reducers are There are many kinds of gearboxes. There are more or less deficiencies in the gearbox. Most electric vehicles use front-wheel drive, and the parking brake is to perform frictional braking on the rear wheels. During the parking process, the handbrake is often not pulled in place. , leading to a small braking force, and the wheels cannot be completely locked; especially when the electric vehicle is parked on a slope, the friction parking brake is used, and the hand brake is used alone, and the vehicle may slide due to not being completely locked; in order to To make the electric vehicle park on the slope safely and reliably, the parking device must be used to brake the wheels; the parking device and the hand brake device are two independent braking devices, and the parking device is used to make the car stop reliably. Park at a certain position or even on a slope; the existing electric vehicle parking device has two structural forms of rack and pinion transmission and hydraulic push rod, the parking device is relatively complicated, and at the same time increases the volume of the transmission case, and the existing The parking ratchet of the car parking device is basically installed on the output shaft (differential half shaft), and the resistance distance received by the parking device is relatively large, so the requirements for the structural strength of the parking device are relatively high; the structure is complex , it is difficult to install and disassemble, and it takes up a lot of space; the flexibility is greatly limited, it cannot be applied to various complex transmissions, and the control is difficult

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