Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1995-11-03
1997-03-18
Marmor, Charles A.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
477174, 180300, B60K 2000
Patent
active
056112475
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION
The present invention relates to a device for actuating the gearbox associated with an engine, especially an automobile, and more particularly such a device comprising: action of the control means; and shaft after the second shaft has rotated through a predetermined angle, and returning the second shaft to its initial position after it has been uncoupled from the first shaft;
Such a device is known from document FR-A-877 118.
In the device of this document, an input shaft is driven by the engine and carries a first series of plates of a plate-type friction clutch. The second series of plates of this clutch is carried by another shaft capable of driving an output shaft in rotation. A control member interacting with a screw and nut system allows the plates to be pressed together and thus allows the input shaft and the output shaft to be joined together in terms of rotation. The screw and nut system is made so that after the shaft carrying the second series of plates, and therefore the output shaft, have rotated by a certain amount, the pressure between the plates ceases and the input shaft and output shaft are thus declutched. A spring then returns the output shaft to its original position.
The aforementioned document makes no provision for actuating a clutch located in the traditional fashion between the engine and a mechanical gearbox, also using the device described.
The automatic control of such a clutch in fact involves serious difficulties. Indeed, after changing gear it is necessary to rematch the rotational speed of the engine to the speed of the vehicle so as to avoid abrupt jarring when letting the clutch back out.
This is particularly important when "downshifting" (shifting from one gear ratio to a lower ratio), when abrupt engagement of the clutch while the engine is idling leads to abrupt braking of the vehicle.
In the absence of an automatic gearshifting device, the driver in these cases on the one hand accelerates so as to bring the engine up to a sufficient speed and, above all, slows down his letting-out of the clutch in order to cause the latter to slip, so as to lead to a progressive slowing-down of the vehicle at the same time as correspondingly accelerating the rotational speed of the engine.
SUMMARY OF THE INVENTION
The present invention aims to improve the devices of the above type so as to allow them to control not only a gearbox but also the clutch associated with it.
To this end, the subject of the invention is a device for actuating the gearbox associated with an engine, especially of an automobile, comprising: action of the control means; and shaft after the second shaft has rotated through a predetermined angle, and returning the second shaft to its initial position after it has been uncoupled from the first shaft; gearbox, these means being designed to be driven by the second shaft; respect to a nominal operating position; and when the angle of rocking is greater than a predetermined angle.
The means for opposing the clutch engagement may of course either prevent this engagement, or just slow it down.
Moreover, a rocking torque corresponds to each angle of rocking of the engine. It is therefore possible to measure the angle of rocking indirectly by measuring the torque, and therefore to replace the distance measurements described hereinbelow by load measurements. This is particularly the case when the engine is rigidly linked.
Engines, especially engine vehicle engines, are in fact generally linked on a chassis via elastic links. As a result, when a resistive torque is applied to their output shaft or to the output shaft of the gearbox with which they are associated, the engine undergoes a rocking movement with respect to the chassis. This rocking movement consequently represents the torque applied to the output shaft.
If this angle is determined, information can be obtained therefrom regarding the resistive torque applied to the output shaft.
Consequently, when the engine speed is too slow with respect to the speed of th
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Kwon Peter T.
Marmor Charles A.
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