Gearshift device for change-speed gearboxes of motor vehicles

Details Gearshift device for change-speed gearboxes of motor vehicles Gearshift device for change-speed gearboxes of motor vehicles

1999-05-03

2001-03-27

Herrmann, Allan D. (Department: 3682)

Machine element or mechanism

Control lever and linkage systems

Multiple controlled elements

C074S473100, C074S473330

Reexamination Certificate

active

06205880

ABSTRACT:

TECHNICAL FIELD
The invention relates to a gearshift device for change-speed gearboxes of motor vehicles, having a shaft movable both axially and radially in the gearbox housing.
BACKGROUND AND PRIOR ART
German specification DE 195 23 141 C2 discloses a gearshift device for a change-speed gearbox of a motor vehicle in which the actuating lever arrangement for the axially and radially movable shifter shaft is formed from two lever arrangements of which one, for the radial movement, engages directly with the shifter shaft and the other, for the axial movement, engages with the shifter shaft in the manner of a shifter fork, by way of a bell-crank lever mounted in a pivot on a part of the housing.
This known actuating lever arrangement has the disadvantage that the hinge joint is connected in the manner of a shifter fork, with sliding movements, and hence the arrangement concerned has to be lubricated and protected against the entry of dirt by protective bellows.
OBJECT OF THE INVENTION
An object of the invention is to improve a gearshift device for change-speed gearboxes of motor vehicles of the above-mentioned kind so that the actuating lever arrangement can be manufactured more simply and economically and with less outlay for necessary protection from dirt.
THE INVENTION
This object is achieved in accordance with the invention by a gearshift device for change-speed gearboxes of motor vehicles of the said kind in which, substantially parallel to the shifter shaft, a supporting pin projecting from the gearbox housing or from a closing plate and having a ball-and-socket joint with only two degrees of twisting freedom is provided and a three-armed actuating lever is supported on said supporting pin through said restricted ball-and-socket joint, the three arms of the three-armed actuating lever being disposed perpendicular to each other in the manner of orthogonal axes of coordinates, one of said arms being connected by way of a ball-and-socket joint to a pin projecting radially from the shifter shaft and the two other said arms being connected by way of ball-and-socket joints to the correspondingly shaped ends of a gearshift linkage or of Bowden gearshift cables. With this arrangement the desired radial and axial movement of the shifter shaft is transferred only through the one arm of the three-armed actuating lever via the ball-and-socket joint both in the axial and in the radial direction. Such a ball-and-socket joint can, in known manner, be manufactured very economically and can be very simply protected from the entry of dirt.
Further features and advantages of the invention will be apparent from the following description. In particular:
the pin projecting radially from the shifter shaft may be provided directly with a ball head and the co-operating arm of the three-armed actuating lever may be provided directly with a ball socket;
to provide the joint with only two degrees of twisting freedom, the three-armed actuating lever may be provided with a receiving opening in which a pre-stressing spring and upper and lower ball sockets are fixedly received through snap catches; the supporting pin may be formed with a step on which, by means of a bore, a ball is received and locked; and the only two degrees of twisting freedom are established by co-operation of a slot in the lower ball socket part with a step and its alignment in the plane of the shifter shaft by means of the snap catches;
the three-armed actuating lever and the associated parts of the ball-and-socket joints may be made from an industrial plastics material having appropriate strength properties by injection moulding.


REFERENCES:
patent: 2481465 (1949-09-01), Auten
patent: 3613474 (1971-10-01), Baumgartl
patent: 5791194 (1998-08-01), Alber et al.
patent: 195 23 141 C2 (1995-06-01), None

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