Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1989-11-13
1991-07-23
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
74335, 200 6188, B60K 2004
Patent
active
050333240
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a gearshift console with at least one gearshift lever for shifting a gearbox of group design.
BACKGROUND OF THE INVENTION
A gearshift console related to the present invention is known from EP 0 052 794. As is apparent from FIG. 3 of this document, four gears of the basic transmission are shifted with manual shift lever 20 from the gearbox manually and mechanically according to an H pattern. Furthermore, two drive gear groups and one reverse gear group are shifted via a second gearshift lever 40. Such devices, or, as shown in FIG. 1 and FIG. 2, with a gear splitting that can be shifted up or down under load, have proved to be successful in farm tractors. However, the mechanical two-lever shifting requires additional space in the driver's cab, and it generally does not any longer meet the requirements imposed on modern farm tractors.
It is therefore an object of the present invention to further develop a gearshift console which requires less space, is easier to operate, and with which shifting of the transmission groups is possible only in the neutral position of the manual gearshift lever for the basic transmission.
SUMMARY OF THE INVENTION
The combination of the shifting of the basic transmission according to an H pattern with the shifting of three auxiliary transmissions with only one gearshift lever leads to a considerable simplification for the driver, because he no longer has to reach from one gearshift lever to the other in many driving situations. The space requirement for the gearshift console in the driver's cab is also reduced. In addition, the power-assisted shifting of the groups facilitates the shifting of such a transmission with two drive groups and one reverse group, wherein the mechanical locking of the shifting knob in a gear selected in the basic transmission requires particularly little effort and no changes or manipulations in the transmission, as is demonstrated by the arrangement of the pawls on the outer tube of the gearshift lever and of the guide webs on the shifting gate plate. The arrangement of only two pawls to lock three positions in one shifting direction of two shifting paths is a particularly space-saving solution. The blocking means, arranged in parallel to the axis of the inner and outer tubes of the gearshift lever, with the swiveling movement limiting means arranged in the same plane, functions well, despite requiring little space, and can be manufactured and mounted in a simple manner.
In conjunction with the pawls and guide webs, the means for limiting the rotary movement, which consists of a straight pin arranged in a housing and an opening in the locking disk, permits simple arrangement of the locking of the shifting of the groups while one gear has been selected in the basic transmission. In the two outer positions of the shifting knob, only rotation toward the middle position must be blocked by one appropriate pawl, since the outward rotation is generally blocked via the means limiting the rotary movement. The middle position of the shifting knob is blocked by both pawls, because the guide web arranged on the gate plate is located between them, and the shifting knob is prevented from rotating via both pawls, the outer tube, and the housing. Shifting three groups via only two microswitches in conjunction with only two cams is possible, because the group associated with the middle position of said shifting knob is shifted by the non-actuation of both microswitches. In each position of said shifting knob which it reaches by being turned out of the middle position, a microswitch will shift, in conjunction with a cam, the corresponding other group.
It is also particularly advantageous that the inner tube with the locking disk and the support plate, and consequently also the microswitch, are not rotated, so that the conductors leading to the microswitches in the inner tube are also immobile, and the swiveling movement of the inner tube does not represent a load for the conductors.
As a consequence of the fa
REFERENCES:
patent: 2582895 (1952-01-01), Young
patent: 3268680 (1966-08-01), Anderson
patent: 4183424 (1980-01-01), Rumyantsev et al.
Dubno Herbert
Herrmann Allan D.
Krolikowski Julie
Zahnradfabrik Friedrichshafen AG
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