Patent ID: 6892599
Filing Date: 2005-05-17
Classification: F16H,Y10T

Abstract:
1. A gear shift device for vehicles with a mechanical, manually operable gearbox which is provided between an engine and driving wheels for the vehicle, wherein the gearbox can be operated by means of a gear lever, said gear shift device comprising: a signal transmitter linked to the gear lever and which comprises two double-acting hydraulic master cylinders which are connected via a transmission device which comprises two pairs of hydraulic lines which are connected to respective master cylinders, to a signal receiver which comprises two double-acting hydraulic slave cylinders, for movement of components of the gearbox for engagement or disengagement of gears, and the gear lever is arranged to be brought from a position wherein a gear is engaged, to a position wherein another gear is engaged, via a neutral position wherein no gear is engaged, and further comprising a first sensor device which, when the gear lever is moved away from the neutral position to a fixed position at a distance from the neutral position or from this position to the neutral position, is arranged to establish a choice as to whether the gearbox should be operated automatically or manually, a second sensor device which is arranged to establish driving parameters on which a gear selection may depend, an electronic control device, which is arranged to receive signals from the sensor devices concerning a chosen mode of operation and values of the driving parameters, and valves for breaking the connection between the hydraulic master cylinders and the hydraulic slave cylinders via the hydraulic lines and establishing a corresponding connection between the control device and the hydraulic slave cylinders, or vice versa, where the control device is arranged to transmit a signal to the valves either a) for breaking the connection between the hydraulic master cylinders and the hydraulic slave cylinders and to transmit signals to the hydraulic slave cylinders for automatic engagement of gears when the automatic mode of operation has been chosen, or b) for establishing the connection between the hydraulic master cylinders and the hydraulic slave cylinders for manual engagement of gears when the manual mode of operation has been chosen.