Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1986-03-21
1989-02-28
Kundrat, Andrew V.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
74527, B60K 2000
Patent
active
048074896
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
The present application is a national phase of PCT/EP85/00362 filed July 20, 1985 and based upon a PCT/EP84/0030 filed July 26, 1984 in Luxembourg under the International Convention.
FIELD OF THE INVENTION
Our present invention relates to a gear shift device and, more particularly, to a multispeed transmission having a set of high speed gears, usually fifth and sixth forward gears, a set of lower speed gears, usually third and fourth forward gears, and an H-shaped shifting path for the shift level between these positions with preferential return to a neutral position in the shift path of the third and fourth gears.
BACKGROUND OF THE INVENTION
Gear shift devices can have an H-shaped shift pattern and an automatic return of the gear shift lever, e.g. into the shift path of the gears 3/4 for 4-, 5- and six speed transmission, when the shift lever is placed in the neutral position. The shifting into a speed outside of the predetermined path requires of the driver, in addition of the movement of the gear shift lever in the direction of the gear preferentially in the direction of forward or reverse drive to evert pressure transverse to the direction of vehicle movement, e.g. into shift path 1/2 to the left and into shift path 5 or 5/6 to the right. These devices have proven themselves in 4- and 5- speed transmissions because they make it easy for the driver to find the correct shift path and the correct gear without forcing him to observe the position of the gear shift lever optically.
These arrangements have been successful with gear shift devices including transfer boxes with a double-H-shift pattern, where the return of the gear shift lever in the lower range, gears 1 to 4, occurs into the shift path of the gears 3/4 and after switching of the transfer box into the higher range of gears 5 to 8 into the shift path of the gears 5/6, and are a great relief for the driver.
In the case of 6-speed transmissions which are realized without transfer boxes, especially upon downshifting from the sixth gear, misshifts can easily occur when the driver, instead of engaging the 5th speed, engages the 3rd speed due to the return of the gear shift lever into the shift path of gears 3/4.
Such mistakes can lead to severe damage in the motor and the transmission at excessive speeds.
OBJECTS OF THE INVENTION
It is therefore the object of the invention to provide an improved gear shift device such that misshifts due to the return of the gear shift lever into predetermined shift paths is avoided, without placing higher demands on the driver, or abandoning the return into predetermined shift paths which in principle is advantageous.
This object is attained in a gear device for a multiple-speed gear, preferably a 6-gear or 6-speed automotive change gear transmission with a gear shift lever for selection and shifting of all gears with gear shift rails for shifting gears in a shift path with an H-shaped pattern similar to that of a 4-speed transmission and with means for returning the gear shift lever into a predetermined shift path wherein for one shift path, e.g. the shift path of gears 5/6, a retention device is provided additionally, which upon completed or nearly completed shift into the higher gear of this shift path, e.g. the 6th gear, retains the gear shift lever in this shift path, and upon completed or nearly completed shift into the lower gear of this shift path, e.g. the 5th gear, permits the return of the gear shift lever into a lower shift path, e.g. the shift path of the gears 3/4, when the gear shift lever is again moved into its neutral position.
A central selection and shift shaft can be arrayed between the gear shift lever and the shift rails or a rotating shaft which is retained by means of the gear shift lever or is returned into predetermined shift paths. For one shift path, e.g. that of the gears 5/6, a retention device is provided additionally which upon completed or nearly completed shift into the higher gear of this shift path, e.g. the 6th gear, retains the ce
REFERENCES:
patent: 3533301 (1970-10-01), Hausinger
patent: 3937100 (1976-02-01), Huffmann et al.
patent: 3939724 (1976-02-01), Takahashi
patent: 4476740 (1984-10-01), Ida et al.
patent: 4567785 (1986-02-01), Reynolds
patent: 4584895 (1986-04-01), Holmes
International Search Report dated Oct. 29, 1986.
Buri Gerhard
Ebner Otto
Grupp Bernhard
Schreiner Friedrich
Dubno Herbert
Kundrat Andrew V.
Zahnradfabrik Friedrichshafen AG
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