Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Reexamination Certificate
1998-05-26
2001-02-13
Bucci, David A. (Department: 3622)
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
C074S493000, C074S527000
Reexamination Certificate
active
06186021
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a shifter for a manual transmission, particularly a shifter including a gate for a shifter pin, the pin mounted on a shifter shaft of the manual transmission, and the gate being fixedly mounted in a transmission housing and which cooperates with the shifter pin to guide the pin.
BACKGROUND AND PRIOR ART
A shifter is disclosed in German patent 39 13 269 ('269 patent), best illustrated in
FIGS. 2-5
thereof. In the '269 patent, a shifter pin is fitted on the shifter shaft and cooperates with slots in a flat shift gate, which is fixedly mounted in the transmission housing.
The shift gate of the '269 patent has the disadvantage that even if, for example, to reduce the amount of space required, it is curved in the shape of a circular arc (best seen in FIGS. 4 and 5 at 25, 26, 27) and therefore takes up a large amount of room within the transmission housing.
OBJECT OF THE INVENTION
The object of the invention is to design a shift gate of the above-mentioned kind in such a way that it can be realised at less cost in space and material.
SUMMARY OF THE INVENTION
To this end, in accordance with the invention, the shifter pin is arranged parallel to the shifter shaft by means of a radial arm and exhibits axial sections of different diameter, and the shift gate is in the form of a flat plate arranged in a plane radial to the shifter shaft and has an arcuate slot in it which in the circumferential direction exhibits sections of different widths. In this way, a shift gate can be provided which is very economical in both space and material.
In one embodiment of the invention, the shifter pin is in the form of a substantially cylindrical shifter pin with a middle section having a cross-section of reduced thickness which determines the neutral or preselection plane and the arcuate slot is formed with three wider circular portions which determine the shift lanes.
In another embodiment of the invention, the shifter pin is in the form of a substantially cylindrical shifter pin having two disc-shaped thicker portions spaced from one another and the arcuate slot is formed with only one central wider portion which determines the neutral or preselection plane.
In a further embodiment of the invention, the shifter pin has a cross-section departing from the cylindrical and the arcuate slot is formed with sections of different width such that the wider portions are adapted to the cross-section of the shifter pin.
In yet another embodiment of the invention, a locking pawl is provided on a pin on the shift gate which is axially displaceable to a limited extent counter to the force of a coil torsion spring and is radially pivotable to an extent limited by means of a stop on the pin and stops on the locking pawl, the locking pawl forming a reverse gear block which prevents direct shifting from 5th gear into reverse gear.
REFERENCES:
patent: 4244236 (1981-01-01), Sylvester
patent: 4919242 (1990-04-01), Muramatsu et al.
patent: 5078242 (1992-01-01), Ratke et al.
patent: 5651290 (1997-07-01), Osborn et al.
patent: 1925642 (1978-05-01), None
patent: 3913269 (1990-10-01), None
Bucci David A.
Charles Marcus
Ford Global Technologies Inc.
McKenzie Frank G.
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