| 摘要 |
A transmission between a driving primary shaft and an outlet shaft of a self-propelled machine, includes a housing within which there are housed, at least in part: a stepdown mechanism; two clutch mechanisms, one being progressive and the other being non-progressive with a movable dog; and a clutch control device including first and second clutch control elements. The second clutch control elements include at least one spring blade extending along the outlet shaft, the spring blade being mounted to move axially on the outlet shaft during axial movement of the dog from the unclutched extreme position towards a clutched position as a result of the movable dog bearing thereagainst, the spring blade being drivable axially on the shaft and being elastically deformable between an active position in which the dog comes into abutment against the spring blade, and an inactive position in which the dog slides along the spring blade. |
| 主权项 |
1. A transmission between a primary drive shaft (1) and an outlet shaft (2), the transmission comprising:
at least one housing (3) within which there are housed at least in part:
a stepdown mechanism (4) comprising a driving member (5) meshing with a driven rotary member (6);two clutch mechanisms (7, 8), one of the mechanisms (7) being progressive and the other mechanism (8) being non-progressive with a movable dog (16), whereby the driven rotary member (6) is suitable for being coupled/decoupled with or from the outlet shaft (2); anda clutch control device comprising
first clutch control means (9) for driving the movable dog (16) of the non-progressive clutch mechanism (8) in axial movement along the outlet shaft (2) between two extreme positions, said first clutch control means (9) being capable of being actuated from outside the housing (3), andsecond clutch control means (10) mounted on the outlet shaft (2) to move under the action of the movable dog (16) moving axially in the clutching direction, by bearing contact against said movable dog (16), between i) an active position in which said second clutch control means (10) are interposed between the movable dog (16) and the progressive clutch mechanism (7) and form a member for transmitting axial movement from the movable dog (16) to the progressive clutch mechanism (7) in order to pass the progressive clutch mechanism from a declutched position to a clutched position, and ii) an inactive or retracted position in which the movable dog (16) is suitable for passing from an unclutched position to the clutched position of the non-progressive clutch mechanism (8); wherein the second clutch control means (10) comprise at least two spring blades (11) extending along the outlet shaft (2) and mounted diametrically opposite each other about said outlet shaft (2), said spring blades being coupled together, at or close to respective ends (11A, 11B) of said spring blades (11), by means of a ring (12) that is engaged on said outlet shaft (2) so as to be constrained to move together axially along said outlet shaft (2), said spring blades (11) being mounted to move axially on said outlet shaft (2) and having said movable dog (16) bearing thereagainst during the axial movement of the movable dog (16) from the unclutched extreme position towards a clutched position, thereby driving said spring blades (11) axially on said shaft (2) and deforming said spring blades elastically between an active position in which the movable dog (16) comes into abutment against said spring blades (11) to transmit its axial movement to the progressive clutch mechanism (7) via the spring blades (11) interposed between the movable dog (16) and the progressive clutch mechanism, and an inactive position in which the movable dog (16) slides along the spring blades (11) to pass the non-progressive clutch mechanism (8) from an unclutched position to a clutched position. |
