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DEVICE FOR SELECTION AND ENGAGEMENT OF THE GEARS OF A GEARBOX FOR MOTOR VEHICLES

  • US 20140083227A1
  • Filed: 06/06/2013
  • Published: 03/27/2014
  • Est. Priority Date: 09/21/2012
  • Status: Active Grant
First Claim
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1. A device for selection and engagement of the gears of a motor-vehicle gearbox, comprising:

  • a casing;

    a control shaft mounted rotatable and axially movable with respect to the casing; and

    an engagement hub mounted on the control shaft and connected in rotation with respect thereto, said engagement hub having a radial engagement finger, for controlling actuation elements of the gears of the gearbox,wherein said radial engagement finger is configured to oscillate in the space comprised between two fingers of a selection mask, said selection mask being mounted on the control shaft and being moreover axially movable with the latter; and

    guide means of said selection mask for guiding the selection mask with respect to the casing in such a way that said selection mask does not follow the rotation of the control shaft and of the engagement hub when a gear is engaged,said device being characterized in that said guide means of the selection mask are shaped in such a way that during an axial travel of the engagement finger towards an extreme position preliminary to the engagement of the reverse gear, the selection mask is forced to move temporarily into a rotated position, in which at least one of the fingers of the selection mask actuates at least one of the actuation elements of the forward gears of the gearbox in such a way as to cause the stop of the rotation of the primary shaft of the gearbox and consequently enable a subsequent regular and silent engagement of the reverse gear.

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