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A gear changing arrangement for a gearbox having a plurality of gears

IP.com Disclosure Number: IPCOM000019822D
Publication Date: 2003-Sep-30
Document File: 1 page(s) / 22K

Publishing Venue

The IP.com Prior Art Database

Abstract

A gear changing arrangement, which comprises an electric control system (Opticruise) is known to use in motor vehicles for changing gears in a gearbox having a plurality of gears. When a gear has been disengaged, a period without driving power is arisen before a synchronous motor speed is obtained where it is possible to engage a higher gear in the gearbox. The object of the invention is to reduce the duration of this period without driving power. According to the invention, the gear changing arrangement comprises a brake device, which is arranged to retard the motor speed to the synchronous speed where it is possible to engage a selected higher gear in the gearbox. Thereby, the motor speed will be reduced much quicker to the synchronous speed than with conventional technique. The brake device may be a friction brake, which is connected to a suitable rotary part of the motor.

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A gear changing arrangement for a gearbox having a plurality of gears

A gear changing arrangement comprising an electric control system (Opticruise) is known to use in motor vehicles for changing gears in a gearbox having a plurality of gears. Gear changes may be initiated automatically by the electric control system or manually when a driver moves a gear level to either the right or left. The clutch pedal only needs to be used during start and stop of the vehicle.

During, for example, town driving, a vehicle has to perform accelerations frequently where higher gears successively are engaged in the gearbox. When a gear has been disengaged, a period without driving power is arisen before a synchronous motor speed is obtained where it is possible to engage a selected higher gear in the gearbox. The duration of such a period influences on the acceleration properties of the vehicle. In reality, the duration of this period is not longer than during a normal manual change of gear but the drivers experience many times this period as longer since they are inactive.

It is an object of the invention to reduce the duration of this period without driving power. According to the invention, the gear changing arrangement comprises a brake device, which is arranged to retard the motor speed to a synchronous speed before a higher gear is engaged in the gearbox. By the use of a brake device, the motor speed will be reduced much quicker to the synchronous speed than with conventional technique...