Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1994-04-20
1996-01-09
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
F16H 6336
Patent
active
054819350
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns gearshifting arrangements for actuating motor vehicle multi-speed transmissions wherein electric motors are used for actuating the gearshifting sets of the transmission.
BACKGROUND OF THE INVENTION
Existing multi-speed transmissions include gearshifting arrangements where the gearshifting force required is partly or wholly supplied by the vehicle's own source of energy. They have the disadvantages that no simple control of the gearshifting force is possible (especially in the pneumatic) and that relatively expensive parts are needed. Sources of energy likewise are not available in all vehicles wherefore they must be additionally installed when required.
An electric power supply which performs a multiplicity of tasks in a vehicle offers itself as a source of energy present in any vehicle. A modification for the importance of control is relatively easily possible. The trend in modern vehicles is toward electronic control of vehicle functions (for instance, automatic transmission, injection and ignition systems, ASC). It appears important to supply the same energy to the control range and the power range. In an electrically actuated transmission this means that an unnecessary change in the kind of energy used in the system of shift control and production of shifting force is avoided. Advantages are to be seen, for instance, in the travel and time-dependent control of the shifting force.
SUMMARY OF THE INVENTION
The gearshifting arrangement of the invention accordingly has a single connecting rod, as an essential gearshifting element, displaceable parallel with the axle of the transmission wheels in the neutral and the gearshifting positions and several coupling mechanisms each coordinated with one of the gearshifting levers. Said coupling mechanisms in an inactivated state, that is when no coupling force is acting, respectively immovably fix an unactuated gearshifting lever in its neutral position to a part fixed to the housing, the connecting rod simultaneously being able to perform unhindered the gearshifting movements. Hereby a movement of the gearshifting levers leading to an unintended introduction of a gear cannot occur. In an actuated or engaged state, the separately actuatable coupling mechanisms produce an operative connection between the connecting rod and a respective gearshifting lever whereby the connection of the gearshifting lever, with the part fixed to the housing, is simultaneously disconnected so that the gearshifting levers can perform unhindered the gearshifting movements of the connecting rod. The several gearshifting levers of the motor vehicle multi-speed transmission consequently are each separately coupled with a single connecting rod that transmits gearshifting force. The coupling mechanism is designed in such a manner that each coupling mechanism can be actuated independently of the remaining coupling mechanisms but, at the same time, grip the same connecting rod available for actuation of the remaining gearshifting levers.
In a further development of the idea of the invention, the coupling mechanism has a coupling bolt, which extends perpendicular to the gearshifting direction of movement of the connecting rod or the direction of the gearshifting force and is simultaneously movable in an axial direction of the gearshifting arm, being mounted by one end to the gearshifting arm and the other end meshing either positively in the part fixed to the housing or in the connecting rod, depending on the action or lack of action of a coupling force. In the coupled state, the lever can be moved together with the connecting rod, while in the uncoupled and locked state the lever is immovably fixed and, at the same time, allows other gearshifting movements of the connecting rod.
In addition, it is advantageous that the coupling mechanism has a coupling bolt with a coupling shaft connected with the arm of the gearshifting lever and with a coupling head which positively meshes in corresponding recesses in the connecting rod and in the part fixed
REFERENCES:
patent: 3131795 (1964-05-01), Shimanckas
patent: 3626781 (1971-12-01), Moser
patent: 3955437 (1976-05-01), Heintz
Bailly Gerhard
Gazyakan Unal
Herrmann Allan D.
ZF Friedrichshafen AG
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