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A segmented roll has a plurality of end-to-end mounted roll segments (10, 10′), each adapted to rotate on bearings supported on a separate support shaft (11). In both axial end surfaces of the support shafts (11) of the roll segments (10) there are coupling means such as an annular projection and an

A segmented roll has a plurality of end-to-end mounted roll segments (10, 10′), each adapted to rotate on bearings supported on a separate support shaft (11). In both axial end surfaces of the support shafts (11) of the roll segments (10) there are coupling means such as an annular projection and an annular recess serving to disengageably connect two adjacent roll segments (10) to each other. The support shaft (11) has at least two parts (16, 18) whose mutual disposition is made alterable for the purpose of altering the axial length of the support shaft (11) so much that the coupling means (29, 41) of the facing axial ends of two adjacent roll segments (10) can be engaged and disengaged with each other. This arrangement makes it possible to change a single roll segment from the central area of the segmented roll without the need for disassembling the entire row of roll segments.

대표청구항 ▼

A segmented roll has a plurality of end-to-end mounted roll segments (10, 10′), each adapted to rotate on bearings supported on a separate support shaft (11). In both axial end surfaces of the support shafts (11) of the roll segments (10) there are coupling means such as an annular projection and an

A segmented roll has a plurality of end-to-end mounted roll segments (10, 10′), each adapted to rotate on bearings supported on a separate support shaft (11). In both axial end surfaces of the support shafts (11) of the roll segments (10) there are coupling means such as an annular projection and an annular recess serving to disengageably connect two adjacent roll segments (10) to each other. The support shaft (11) has at least two parts (16, 18) whose mutual disposition is made alterable for the purpose of altering the axial length of the support shaft (11) so much that the coupling means (29, 41) of the facing axial ends of two adjacent roll segments (10) can be engaged and disengaged with each other. This arrangement makes it possible to change a single roll segment from the central area of the segmented roll without the need for disassembling the entire row of roll segments. >a torque split mode reduction gear unit connected to the unit input shaft;a planetary gearset comprising:a first member coupled to an output shaft of the continuously variable transmission;a second member coupled to a common output shaft common to the power recirculation mode reduction gear unit and the torque split mode reduction gear unit; anda third member coupled to a unit output shaft of the infinitely variable transmission;a power recirculation mode clutch interleaved between an output member of the power recirculation mode reduction gear unit and the common output shaft, for inputting a torque greater than a torque through the unit input shaft into the continuously variable transmission when the power recirculation mode clutch is engaged;a torque split mode clutch interleaved between an output member of the torque split mode reduction gear unit and the common output shaft, for inputting a torque smaller than the torque through the unit input shaft into the continuously variable transmission when the torque split mode clutch is engaged;a direct mode clutch interleaved between the output shaft of the continuously variable transmission and the unit output shaft of the infinitely variable transmission, for inputting the torque through the unit input shaft into the continuously variable transmission when the direct mode clutch is engaged; andthe power recirculation mode clutch, the direct mode clutch, and the torque split mode clutch being selectively engaged and disengaged for establishing either of a power recirculation mode, a direct mode, and a torque split mode.2. The torque split infinitely variable transmission as claimed in claim 1, wherein:the power recirculation mode is established by engaging the power recirculation mode clutch and disengaging both the torque split mode clutch and the direct mode clutch;the direct mode is established by disengaging both the power recirculation mode clutch and the torque split mode clutch and engaging the direct mode clutch; andthe torque split mode is established by engaging the torque split mode clutch and disengaging both the power recirculation mode clutch and the direct mode clutch.3. The torque split infinitely variable transmission as claimed in claim 1, wherein:the output shaft of the continuously variable transmission and the power recirculation mode reduction gear unit are connected in parallel with each other;a torque split mode reduction gear and clutch device, including the torque split mode reduction gear unit and the torque split mode clutch, is arranged parallel to a power recirculation mode reduction gear and clutch device, including the power recirculation mode reduction gear unit and the power recirculation mode clutch.4. The torque split infinitely variable transmission as claimed in claim 1, wherein:a ratio R3/R13 of a reduction ratio R3 of the power recirculation mode reduction gear unit to a reduction ratio R13 of the torque split mode reduction gear unit is set to be equal to a ratio VLow/VHigh of a maximum transmission ratio VLow of the continuously variable transmission to a minimum transmission ratio VHigh of the continuously variable transmission.5. The torque split infinitely variable transmission as claimed in claim 1, wherein:the continuously variable transmission comprises a toroidal continuously variable transmission, which has input and output disks coaxially arranged and opposing each other and a direction of rotation of the output disk is reversed relative to a direction of rotation of the input disk.6. A torque split infinitely variable transmission comprising: a continuously variable transmission connected to a unit input shaft of the infinitely variable transmission;a power recirculation mode re duction gear unit connected to the unit input shaft;a torque split mode reduction gear unit connected to the unit input shaft;a planetary gearset comprising:a sun gear coupled to an output shaft of the continuously variable transmission;a single-planet-pinion carrier coupled to a common output shaft common to the power recirculation mode reduction gear unit and the torque split mode reduction gear unit; anda ring gear coupled to a unit output shaft of the infinitely variable transmission;a power recirculation mode clutch provided in a power transmission line extending from the unit input shaft to the single-planet-pinion carrier of the planetary gearset, for inputting a torque greater than a torque through the unit input shaft into the continuously variable transmission when the power recirculation mode clutch is engaged;a torque split mode clutch provided in the power transmission line extending from the unit input shaft to the single-planet-pinion carrier, for inputting a torque smaller than the torque through the unit input shaft into the continuously variable transmission when the torque split mode clutch is engaged;a direct mode clutch provided in a power transmission line extending from the output shaft of the continuously variable transmission to the unit output shaft of the infinitely variable transmission, for inputting the torque through the unit input shaft into the continuously variable transmission when the direct mode clutch is engaged; andthe power recirculation mode clutch, the direct mode clutch, and the torque split mode clutch being selectively engaged and disengaged for establishing either of a power recirculation mode, a direct mode, and a torque split mode.7. A torque split infinitely variable transmission comprising: a continuously variable transmission connected to a unit input shaft of the infinitely variable transmission;a power recirculation mode reduction gear unit connected to the unit input shaft;a torque split mode reduction gear unit connected to the unit input shaft;a planetary gearset comprising:a sun gear coupled to an output shaft of the continuously variable transmission;a single-planet-pinion carrier coupled to a common output shaft common to the power recirculation mode reduction gear unit and the torque split mode reduction gear unit; anda ring gear coupled to a unit output shaft of the infinitely variable transmission;a power recirculation mode clutch provided in a power transmission line extending from the unit input shaft to the single-planet-pinion carrier of the planetary gearset, for inputting a torque greater than a torque through the unit input shaft into the continuously variable transmission when the power recirculation mode clutch is engaged;a torque split mode clutch provided in the power transmission line extending from the unit input shaft to the single-planet-pinion carrier, for inputting a torque smaller than the torque through the unit input shaft into the continuously variable transmission when the torque split mode clutch is engaged;a direct mode clutch provided in a power transmission line extending from the output shaft of the continuously variable transmission to the unit output shaft of the infinitely variable transmission, for inputting the torque through the unit input shaft into the continuously variable transmission when the direct mode clutch is engaged;the power recirculation mode clutch, the direct mode clutch, and the torque split mode clutch being selectively engaged and disengaged for establishing either of a power recirculation mode, a direct mode, and a torque split mode;a reduction gearset comprising:an output gear of the continuously variable transmission, coaxially arranged w ith and rotatably supported on the unit input shaft;a counter gear whose rotation axis is parallel to the unit input shaft; anda gear fixed onto the output shaft of the continuously variable transmission, and meshingly engages via the counter gear with the output gear of the continuously variable transmission, and coaxially arranged with the sun gear of the planetary gearset;the power recirculation mode reduction gear unit comprising:a first input gear coaxially arranged with the unit input shaft; anda first output gear in meshed-engagement with the first input gear and coaxially arranged with the single-planet-pinion carrier, the first input gear and the first output gear being provided in the power transmission line extending from the unit input shaft to the single-planet-pinion carrier; andthe torque split mode reduction gear unit comprising:a second input gear coaxially arranged with the unit input shaft and parallel to the first input gear; anda second output gear in meshed-engagement with the second input gear and coaxially arranged with the single-planet-pinion carrier and parallel to the first output gear, the second input gear and the second output gear provided in the power transmission line extending from the unit input shaft to the single-planet-pinion carrier.8. The torque split infinitely variable transmission as claimed in claim 7, wherein:a first revolution synchronous point for switching between the power recirculation mode and the direct mode is set as a mode switching point corresponding to a maximum transmission ratio VLow of the continuously variable transmission that satisfies a first expression VLow=R3/R1, where R3 is a reduction ratio of the power recirculation mode reduction gear unit and R1 is a reduction ratio of the reduction gearset; anda second revolution synchronous point for switching between the direct mode and the torque split mode is set as a mode switching point corresponding to a minimum transmission ratio VHigh of the continuously variable transmission that satisfies a second expression VHigh=R13/R1, where R13 is a reduction ratio of the torque split mode reduction gear unit and R1 is the reduction ratio of the reduction gearset.