Transmission gear shift rod control device
AssigneeMagneti Marelli S.p.A.
InventorGianluigi Lenzi
Life of this patent
Estimating the term…
Abstract
A control device for controlling a gear shift rod, and having a control shaft connected to the gear shift rod; a linear actuator for effecting given axial displacements or given angular displacements of the control rod to shift between two gear engagement positions in the same range; a first cam guide device for converting, on command, the axial or angular displacements into combined axial-angular displacements, so as to shift between consecutive gears in consecutive ranges; and a second cam guide device for converting, on command, the axial or angular displacements into combined axial-angular displacements, so as to shift between nonconsecutive gears in not necessarily consecutive ranges.
Claims12
A control device (1) for controlling the gear shift rod (2) of a transmission, wherein the gear shift rod (2) is movable, by virtue of axial displacements and/or rotations, between a number of gear engagement positions, each corresponding to engagement of a gear or to the neutral position;
- the control device (1) comprising:
- fixed supporting means (5);
- a control shaft (6) fitted to said fixed supporting means (5) so as to rotate angularly about its own axis (A) to effect a gear range selection, and move axially along its own axis (A) to engage/disengage the gears;
- for each gear range, said control shaft (6) also assuming three distinct axial positions corresponding respectively to an axial neutral position and two axial gear engagement positions;
- actuating means (7) for selectively moving said control shaft (6) axially along its own axis (A) between said three distinct axial positions;
- and
- first cam guide means (8) connected mechanically to said control shaft (6), and which provide, during axial displacement of the control shaft (6) to shift between the two axial gear engagement positions of one range, for selectively effecting a sufficient angular rotation of the control shaft (6) to shift to the immediately following/preceding range, so as to effect a sequential gear engagement, between consecutive gears in consecutive ranges;
- the control device (1) being characterized by comprising second cam guide means (9, 10) connected mechanically to said control shaft (6), and which provide, during axial displacement of the control shaft (6) to shift between the two axial gear engagement positions of one range, for selectively effecting an angular rotation of the control shaft (6) in the opposite direction to that effected by the first cam guide means (8), so as to shift between nonconsecutive gears.
A control device (1) for controlling the gear shift rod (2) of a transmission, wherein the gear shift rod (2) is movable, by virtue of axial displacements and/or rotations, between a number of gear engagement positions, each corresponding to engagement of a gear or to the neutral position;
- the control device (1) comprising:
- fixed supporting means (5);
- a control shaft (6) fitted to said fixed supporting means (5) so as to rotate angularly about its own axis (A) to engage/disengage the gears, and move axially along its own axis (A) to effect a gear range selection;
- for each gear range, said control shaft (6) also assuming three distinct angular positions corresponding respectively to an angular neutral position and two angular gear engagement positions;
- actuating means (7′) for selectively moving said control shaft (6) angularly about its own axis (A) between said three distinct angular positions;
- and
- first cam guide means (8) connected mechanically to said control shaft (6), and which provide, during angular displacement of the control shaft (6) to shift between the two angular gear engagement positions of one range, for selectively effecting a sufficient axial displacement of the control shaft (6) to shift to the immediately following/preceding range, so as to effect a sequential gear engagement, between consecutive gears in consecutive ranges;
- said control device (1) being characterized by comprising second cam guide means (9, 10) connected mechanically to said control shaft (6), and which provide, during angular displacement of the control shaft (6) to shift between the two angular gear engagement positions of one range, for selectively effecting an axial displacement of the control shaft (6) in the opposite direction to that effected by the first cam guide means (8), so as to shift between nonconsecutive gears.
Dependencies are inferred from the claim text.