1. A straddle-ride type vehicle comprising:
a power unit, said power unit including:
a crankshaft;
first and second main shafts disposed in this order from the crankshaft side;
a counter shaft straddling and engaging the first and second main shafts;
a crankcase rotatably supporting the crankshaft, the first and second main shafts and the counter shaft in a parallel manner;
first and second clutches installed at corresponding one end portions of the main shafts and individually connecting and disconnecting the transmission of rotational power from the crankshaft to the main shafts; and
a plurality of gear trains for speed-change stages, each of the plurality of gear trains being located on a corresponding one of the main shafts and the counter shaft and being selectively established by turning of a shift drum parallel to the main shafts and the counter shaft;
a swing arm supporting a drive wheel at a rear portion; and
a pivot shaft disposed behind the crankcase and parallel with the first and second main shafts and with the counter shaft and vertically swingably supporting a front portion of the swing arm,
wherein the power unit in configured to switch the speed-change stages by changing the clutches and transmitting power to the drive wheel from an end portion of the counter shaft projecting from the crankcase, and
wherein one of respective axial centers of the first and second main shafts is disposed on one side with respect to a line and the other of respective axial centers of the first and second main shafts is disposed on the other side of said line, said line connecting an axial center of the counter shaft with an axial center of the pivot shaft, as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft.
2. The straddle-ride type vehicle according to claim 1, wherein as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft, the line is inclined rearward downward and one of the respective axial centers of the first and second main shafts is disposed obliquely rearward of and above the line and the other of the respective axial centers of the first and second main shafts is disposed obliquely forward of and below the line.
3. The straddle-ride type vehicle according to claim 1, wherein as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft, one of the respective axial centers of the first and second main shafts is disposed above a second line and the other of the respective axial centers of the first and second main shafts is disposed below the second line, the second line connecting the axial center of the crankshaft with the axial center of the pivot shaft.
4. The straddle-ride type vehicle according to claim 3, wherein as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft, said one of the first and second main shafts does not overlap with the second line, and said other of the first and second main shafts overlaps with the second line.
5. The straddle-ride type vehicle according to claim 4, wherein as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft, the counter shaft is disposed such that an axial center of the counter shaft is located above the second line, and the counter shaft overlaps with the second line.
6. The straddle-ride type vehicle according to claim 1, wherein as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft, one of the respective axial centers of the first and second main shafts is disposed above a third line and the other of the respective axial centers of the first and second main shafts is disposed below the third line, the third line connecting the axial center of the crankshaft with the axial center of the counter shaft.
7. The straddle-ride type vehicle according to claim 1, wherein the clutches are disposed to vertically overlap each other at least in part.
8. The straddle-ride type vehicle according to claim 1, wherein a portion, located on a rear side, of each of the clutches and the pivot shaft are disposed to vertically overlap each other at least in part.
9. The straddle-ride type vehicle according to claim 1, wherein a portion, located on a rear side, of each of the clutches is disposed above each of the lines.
10. A vehicle comprising:
a power unit, said power unit including:
a crankshaft;
first and second main shafts;
a counter shaft; and
a crankcase rotatably supporting the crankshaft, the first and second main shafts and the counter shaft in a parallel manner; and
a pivot shaft disposed behind the crankcase and parallel with the first and second main shafts and with the counter shaft and vertically swingably supporting a front portion of a swing arm,
wherein one of respective axial centers of the first and second main shafts is disposed on one side with respect to a line and the other of respective axial centers of the first and second main shafts is disposed on the other side of said line, said line connecting an axial center of the counter shaft with an axial center of the pivot shaft, as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft.
11. The straddle-ride type vehicle according to claim 10, wherein as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft, the line is inclined rearward downward and one of the respective axial centers of the first and second main shafts is disposed obliquely rearward of and above the line and the other of the respective axial centers of the first and second main shafts is disposed obliquely forward of and below the line.
12. The straddle-ride type vehicle according to claim 10, wherein as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft, one of the respective axial centers of the first and second main shafts is disposed above a second line and the other of the respective axial centers of the first and second main shafts is disposed below the second line, the second line connecting the axial center of the crankshaft with the axial center of the pivot shaft.
13. The straddle-ride type vehicle according to claim 12, wherein as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft, said one of the first and second main shafts does not overlap with the second line, and said other of the first and second main shafts overlaps with the second line.
14. The straddle-ride type vehicle according to claim 13, wherein as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft, the counter shaft is disposed such that an axial center of the counter shaft is located above the second line, and the counter shaft overlaps with the second line.
15. The straddle-ride type vehicle according to claim 10, wherein as viewed in side elevation from the axial direction of the first and second main shafts and the counter shaft, one of the respective axial centers of the first and second main shafts is disposed above a third line and the other of the respective axial centers of the first and second main shafts is disposed below the third line, the third line connecting the axial center of the crankshaft with the axial center of the counter shaft.
16. The straddle-ride type vehicle according to claim 10, wherein the clutches are disposed to vertically overlap each other at least in part.
17. The straddle-ride type vehicle according to claim 10, wherein a portion, located on a rear side, of each of the clutches and the pivot shaft are disposed to vertically overlap each other at least in part.
18. The straddle-ride type vehicle according to claim 10, wherein a portion, located on a rear side, of each of the clutches is disposed above each of the lines.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An electrode-membrane assembly comprising a pair of electrodes at least one of which is a porous electrode, and a thermoplastic resin membrane having a functional group capable of being modified to a free ion exchange group upon hydrolysis, which is interposed between said two electrodes and partly penetrates into the pores of said at least one porous electrode.
2. The electrode-membrane assembly as claimed in claim 1, wherein said thermoplastic resin acts as a precursor of a fluorine-containing ion exchange membrane having a sulfonic acid group.
3. The electrode-membrane assembly as claimed in claim 1, wherein said thermoplastic resin membrane acts as a precursor of a fluorine-containing ion exchange membrane having a phosphonic acid group.
4. The electrode-membrane assembly as claimed in claim 1, wherein said thermoplastic resin is a copolymer of tetrafluoroethylene and a fluorovinyl compound having sulfonyl fluoride as a functional group.
5. An electrode-membrane assembly comprising a pair of electrodes at least one of which is a porous electrode, and an ion exchange membrane having a free ion exchange group, which is interposed between said two electrodes and partly penetrates into the pores of said at least one porous electrode.
6. A fuel cell comprising an electrode-membrane assembly as claimed in claim 5.
7. A zero-gap type electrolytic cell comprising an electrode-membrane assembly, said electrode-membrane assembly comprising a pair of electrodes at least one of which is a porous electrode, and an ion exchange membrane having a free ion exchange group, which is interposed between said two electrodes and partly penetrates into the pores of said at least one porous electrode.
8. A process for the preparation of an electrode-membrane assembly comprising a pair of electrodes at least one of which is a porous electrode, and a thermoplastic resin membrane having a functional group capable of being modified to a free ion exchange group upon hydrolysis, which is interposed between said two electrodes and partly penetrates into the pores of said at least one porous electrode,
which process comprises interposing a thermoplastic resin membrane having a functional group capable of being modified to a free ion exchange group upon hydrolysis between a pair of electrodes at least one of which is a porous electrode, applying an external force to the assembly so that said thermoplastic resin membrane is deformed and partly allowed to penetrate into the pores of said at least one porous electrode to make integration, and then subjecting the assembly to hydrolysis so that said functional group is released and modified to a free ion exchange group.