A running gear, for example, a single-rail lower-flange running gear for hoisting equipment, includes several wheels running on a rail, at least two of which are arranged one behind the other in the direction of travel of the running gear and adapted to be driven by an electric motor. The driven wheels are joined to at least two shafts, which are oriented coaxially to the axis of rotation of said at least two driven wheels.
1. A single-rail lower-flange running gear for hoisting machines, said running gear comprising:
a plurality of wheels running along a rail;
a right side shield and a left side shield, wherein said plurality of wheels is mounted on said right side shield and said left side shield, wherein at least two of said plurality of wheels are driven wheels arranged one behind the other in the direction of travel of the running gear and are adapted to be jointly driven by an electric motor;
at least two shafts joined to said driven wheels, said at least two shafts being oriented coaxially to the axis of rotation of said driven wheels and being drivable by said electric motor, wherein at least one of said right side shield and said left side shield includes hollow projecting hubs on an inner side, wherein each of said at least two driven wheels is supported on an outer circumference of a respective one of said hollow projecting hubs, and wherein said at least two shafts are positioned through said hollow projecting hubs and through said at least one of said right side shield and said left side shield;
wherein the other of said right side shield and said left side shield includes at least one solid projecting hub on an inner side thereof, opposite said hollow projecting hubs, wherein said at least one solid projecting hub supports a respective one of said plurality of wheels at said other of said right side shield and said left side shield;
at least two gears, each of said at least two gears mounted on a respective one of said at least two shafts, wherein said at least two gears are arranged at an opposite side of said at least one of said right side shield and said left side shield from said at least two driven wheels; and
an intermediate gear adapted to mesh with each of said at least two gears mounted on said at least two shafts.
2. The running gear of claim 1 , wherein said at least two shafts are mounted on one of said right side shield and said left side shield of the running gear.
3. The running gear of claim 2 , wherein one of said at least two shafts extends beyond said gear mounted on said shaft and is connected to the electric motor via a transmission.
4. The running gear of claim 2 , wherein said intermediate gear is mounted on an intermediate shaft connected to the electric motor.
5. The running gear of claim 4 , including a transmission gear mounted on said intermediate shaft and a driving gear connected to the electric motor, said transmission gear adapted to mesh with said driving gear.
6. The running gear of claim 5 , including a housing and a frame, wherein at least said gears mounted on said at least two shafts and said intermediate gear are enclosed by a part of said housing, said housing fastened to said side shield of said frame.
7. The running gear of claim 6 , wherein the electric motor is mounted on said housing part.
8. The running gear of claim 7 , wherein the electric motor drives said at least two shafts via a transmission.
9. The running gear of claim 8 , wherein said at least two shafts and said driven wheels are configured as a single piece.
10. The running gear of claim 2 , including a housing and a frame, wherein at least said gears mounted on said at least two shafts and said intermediate gear are enclosed by a part of said housing, said housing fastened to said side shield of said frame.
11. The running gear of claim 1 , wherein said rail is I-shaped, wherein said right side shield and said left side shield are joined together by a cross arm to form a U-shaped frame enclosing said I-shaped rail.
12. The running gear of claim 11 , wherein said plurality of wheels are mounted on an inner side of said right side shield and said left side shield, wherein said plurality of wheels roll along a lower flange of said I-shaped rail.
13. The running gear of claim 1 , including guide rollers running along a side of said rail for guiding the running gear.
14. The running gear of claim 1 , said running gear further comprising:
a cross arm joining said right side shield and said left side shield to form a U-shaped frame; and
an I-shaped rail enclosed by said U-shaped frame, wherein said plurality of wheels rolls along a lower flange of said I-shaped rail.
15. The running gear of claim 14 , including guide rollers running along a side of said I-shaped rail for guiding the running gear.
16. The running gear of claim 1 , further comprising a bearing disposed on the outer circumference of each of said hollow projecting hubs, wherein each of said bearings is adapted to support one of said driven wheels.
17. A single-rail lower-flange running gear for hoisting machines, said running gear comprising:
a plurality of wheels running along a rail;
a right side shield and a left side shield, wherein said plurality of wheels is mounted on said right side shield and said left side shield, wherein at least two of said plurality of wheels are driven wheels arranged one behind the other in the direction of travel of the running gear and are adapted to be jointly driven by an electric motor;
at least two shafts joined to said driven wheels, said at least two shafts being oriented coaxially to the axis of rotation of said driven wheels and being drivable by said electric motor;
wherein each of said right side shield and said left side shield includes projecting hubs on an inner side thereof, and wherein said projecting hubs of at least one of said right side shield and said left side shield comprise hollow projecting hubs, wherein each of said driven wheels is supported on an outer circumference of a respective one of said projecting hubs, and wherein said at least two shafts are positioned through said hollow projecting hubs and through said at least one of said right side shield and said left side shield;
wherein the other of said right side shield and said left side shield includes at least one solid projecting hub on an inner side thereof, and wherein at least one other of said plurality of wheels is supported on an outer circumference of said at least one solid projecting hub; and
a bearing disposed on the outer circumference of each of said hollow projecting hubs and each of said solid projecting hubs, wherein each of said bearings is adapted to support one of said plurality of wheels.