US 9,811,109 B2
Control device for a crawler vehicle
Fabio Pescione, Avella (IT); Enrico Conti, Brescia (IT); and Sergio Magrini, Modena (IT)
Assigned to CNH Industrial America LLC, New Holland, PA (US)
Appl. No. 13/882,349
Filed by Fabio Pescione, Avella (IT); Enrico Conti, Brescia (IT); and Sergio Magrini, Modena (IT)
PCT Filed Oct. 28, 2011, PCT No. PCT/EP2011/069022
§ 371(c)(1), (2), (4) Date Oct. 2, 2013,
PCT Pub. No. WO2012/056015, PCT Pub. Date May 3, 2012.
Claims priority of application No. MO2010A0303 (IT), filed on Oct. 29, 2010.
Prior Publication US 2014/0013892 A1, Jan. 16, 2014
Int. Cl. B60K 6/00 (2006.01); G05G 9/02 (2006.01); E02F 9/20 (2006.01); F16H 59/02 (2006.01); F16H 61/24 (2006.01)
CPC G05G 9/02 (2013.01) [E02F 9/2004 (2013.01); F16H 59/02 (2013.01); F16H 61/24 (2013.01); Y10T 74/20073 (2015.01)] 10 Claims
OG exemplary drawing
 
1. A device configured to control a transmission of a crawler vehicle, comprising:
a lever element actuatable by an operator in a first direction and rotatable by the operator in a direction transverse to the first direction, the lever element being continuously displaceable between a plurality of positions;
a control element operable by the lever element and configured to engage and disengage a main clutch of the crawler vehicle; and
a cam member cooperating with a rocker arm assembly to apply on the lever element a controlled force, the controlled force depending on a position of the lever element;
wherein the cam member is coupled to the lever element such that displacement of the lever element between the plurality of positions drives the cam member to rotate relative to the rocker arm assembly, and the lever element is rotatable relative to the cam member without altering a position of the cam member,
wherein the cam member is delimited by a cam profile which has a recess configured to stably receive a cam follower of the rocker arm assembly in one of the plurality of positions of the lever element corresponding to a configuration in which the main clutch is engaged,
wherein the cam profile has a valley configured to stably receive the cam follower in a neutral stable position of the lever element corresponding to a configuration in which the main clutch is disengaged,
wherein the cam profile has a profile portion interposed between the valley and the recess, the profile portion being inclined toward the valley so that, if the lever element is released when the cam follower is in contact with the profile portion, the cam member brings the lever element back to the neutral stable position,
wherein along the profile portion, the rocker arm assembly applies to the cam member a force which progressively increases from the valley towards the recess,
wherein the cam profile has an inclined stretch arranged at an opposite side of the valley with respect to the recess so that, when the cam follower is in contact with the inclined stretch, a transmission brake suitable for braking a gearing mechanism of the vehicle gearbox is activated.