Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1996-06-14
1998-04-28
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
74473R, F16H 6336
Patent
active
057431477
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a gearshift device for gearshift actuation of multi-speed transmissions according to the preamble of claim 1.
Already known are locking devices which interlock fork-shaped gearshift elements in order to prevent an erroneous function, that is, inadvertent simultaneous engagement of two gears, which unquestionably causes damage or absolute destruction of the transmission.
Such a locking device for a single gearshift rod upon which several gearshift levers are situated has been described in DE 40 17 957. Here, rocking arms are provided as locking elements which prevent movements of the gearshift levers when they mesh via locking cams in locking grooves existing on each gearshift lever.
However, in said publication it is not described how to control or select the respective gearshift lever needed for engaging the desired gear or how this mechanism precisely functions. It is only mentioned that the gearshift levers are moved according to a turning and axial movement of the gearshift rod.
The best known transmissions have several gearshift rods for selecting or controlling a specific gearshift lever or fork. But such an arrangement has the disadvantage of requiring much space and the assembly is complicated and thus expensive.
Therefore, this invention is based on the problem of developing the prior art in a manner that is simple, inexpensive and reliable and especially in which only a single gearshift rod is needed for gearshifting.
According to the invention, said problem is solved by the features stated in the characteristic part of claim 1.
The solution proposed by the invention makes possible, in a practically simple manner, the realization of a gearshift device that rules out any operating error or malfunction, that saves space and that can be very easily and economically assembled and disassembled.
Advantageous developments and embodiments of the invention result from subclaims 2 to 13 and from the following description with reference to the drawing of an embodiment. In the drawings:
FIG. 1 is a section through a transmission housing with a gearshift device according to the invention following line 1--1 of FIG. 2;
FIG. 2 is a perspective view of the gearshift device of FIG. 1;
FIG. 3 is a perspective view of a second embodiment in a design with gearshift forks;
FIG. 4 is a perspective view of the embodiment of FIG. 3 in a design with gearshift levers;
FIG. 5 is a perspective view of a basic member of a coupling means;
FIG. 6 is a longitudinal section through the basic member of a coupling means along line 6--6 in FIG. 5;
FIG. 7 is a gearshift rod with several driving elements;
FIG. 8 is a view of the basic member of the coupling means with the gearshift rod;
FIG. 9 is a section along line 9--9 of FIG. 10 through the basic member of the coupling means;
FIG. 10 to 12 show a longitudinal section through the retaining means diagrammatically showing the selection of a gearshift fork or gearshift lever and
FIG. 13 is a section through the basic member of a coupling means along line 13--13 of FIG. 8.
FIG. 1 and 2 show a first embodiment of the gearshift device according to the invention which is adequate only for use with gearshift levers.
Referring to FIG. 1 a section is shown through a gearshift device according to the invention.
A gearshift rod 2 is rotatably and axially movably supported in a transmission housing 1. Upon the gearshift rod 2, a coupling means 3 is firmly supported which has a sleeve-shaped basic member 4 where a groove 5 is made extending perpendicularly to the longitudinal axis of the basic member 4. A stop bolt 7, under the action of a stressing spring, is movably supported in the top portion 8 of a gearshift lever 9. Said stressing spring is designed as compression spring 10. At the indicated place, the stop bolt 7 is urged by the compression spring 10 against the surface of the groove. The gearshift lever 9 is rotatable in relation to the transmission housing 1. For this purpose, the gearshift lever 9 is supported in the transmission housing 1 tiltably about two bol
REFERENCES:
patent: 3513717 (1970-05-01), Lickey et al.
Patent Abstracts of Japan vol. 8, No. 33 (P-254) 14. Feb. 1984 & JP,A,58 189 716 (Mitsubishi Jidosha) 5. Nov. 1983.
Herrmann Allan D.
ZF Friedrichshafen AG
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