| 摘要 |
Endothermic engine (1) for an industrial vehicle comprising a continuous braking device (2) capable of actuating a supplementary opening of the exhaust valves (3) so as to dissipate the compression energy produced inside the cylinders, in which the profile of the exhaust valves (3) control cams (36) consists of a first section (56) with null lift, corresponding to one stage of the suction stroke of the relevant cylinders, a second section (57) with a constant reduced lift, corresponding to the last stage of the suction stroke and to both compression and power stroke of the relevant cylinders, and a third lobe section (58) corresponding to the exhaust stroke of the respective cylinder; said continuous braking device (2) comprising an actuator (46) capable of displacing rotation axis (24) of control rocker arms(18) of exhaust valves (3) from a first normal work position, in correspondence to which valve clearance (g) is large enough to cause second section (57) of the cams profile (36) to be ineffective, and a second braking position, in correspondence of which the value (g') of valve clearance is reduced in such a way, as to activate said second section (57). <IMAGE> <IMAGE> |
