192 clutches and power-stop control – Transmission control and clutch control – Interrelated
Patent
1990-01-31
1991-10-15
Lorence, Richard
192 clutches and power-stop control
Transmission control and clutch control
Interrelated
192 354, 192114R, 74334, 74483R, B60K 4122
Patent
active
050566326
DESCRIPTION:
BRIEF SUMMARY
The invention is concerned with an auxiliary power actuated clutch and gear shifting device for motor vehicles with a gear preselector and a gear-change mechanism controlled by the driver through the clutch actuation mechanism at the clutch pedal and produces a response signal when the gear is engaged in the transmission after the shifting of gears.
BACKGROUND OF THE INVENTION
Such gear shifting devices in which the driver, or even an electronic device, selects only the gear desired and the shifting in the transmission itself is not carried out directly by the driver through a gear shift linkage, but by an auxiliary power actuated device for the coupling, are known in many embodiments; for example: Synchron Transmission F 43546/RT 34000 8.85, Transmission F32437/RT 3431-8.85, No. 6510302300, of 3.86 Scania - shift gears easier with a computer, page 4, column 2, second paragraph.
In all of these embodiments, the opening and closing of the clutch, and consequently of the drive trains between the engine and the transmissions, continues to be accomplished by the driver through the clutch pedal. While the driver knows when the gear is engaged as a consequence of direct contact with the shifting means in the transmission when gears are shifted by a gear shift linkage, that information, with the actuation of the gearshift lever and the gear shift linkage, is not in an auxiliary power actuated gear shifting mechanism. For operating the clutch at the proper time, and especially for closing the clutch after the shifting of gears in the transmission has been completed, response signals to the driver such as acoustical, optical and a physical feel are known.
After the conclusion of the shifting procedures in the transmission, the driver train can be closed again by the driver. The effort in the prior art devices to close the drive train as quickly as possible can result in difficulties. For example, if the driver doesn't wait for a response signal that a gear has been engaged in the transmission but closes the clutch without a gear having been shifted, the transmission will be in the neutral position. In such a case, the drive train is acutally not closed, although the clutch is in the closed position. Repeat shifting of gears by means of the clutch pedal is rendered difficult in most cases because all the gears have to be synchronized again before the gear shifting takes place. Thus the speeding up of the gear shifting process desired by the driver is delayed as a result of such procedure, or, a shifting of gears is prevented entirely by further incorrect operation.
SUMMARY OF THE INVENTION
Therefore, the object of the invention is to provide a power actuated clutch device having a novel safety device wherein the clutch can be closed only after the shifting of gears is completed.
With the locating of the safety device adjacent to the clutch pedal and with the locking of that pedal itself until each subsequent gear is engaged in a shifting of gears, a shifting of the transmission into the neutral position is prevented in a simple manner. When the clutch pedal is pressed intentionally, no spring restoring force acting on the pedal is felt on the foot of the driver because the pedal has been locked against movement, so that he immediately becomes aware of his incorrect operation and can correct it. In particular, he can always engage the clutch gently because he, in fact, remains with his foot on the opening position of the clutch pedal or only leaves that opening position for a short time, or preferably does so slightly.
Additional devices for the gentle engaging of the clutch are not required in case of incorrect operation because he becomes aware of that condition immediately and not just in the initial position of the clutch pedal.
For it to be possible for the clutch pedal to be returned to the initial position when the vehicle is shut off without a gear being engaged, it is relatively easy to connect the novel safety device with an operating lever or an operating shifting device that is not shifted into the
REFERENCES:
patent: 2508263 (1950-05-01), Jirsa
patent: 3011357 (1961-12-01), Binder
Lemp Norbert
Petzold Rainer
Lorence Richard
Zahnradfabrik Friedrichshafen AG.
Zalkind Albert M.
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