Method of making a bevel gear system

1. A method of making a bevel gear system comprising:

providing a pinion gear;

providing a first set of side gears and a second set of side gears;

determining a desired gear ratio of the bevel gear system;

selecting a member of the first set of side gears and a member of the second set of side gears corresponding to the desired gear ratio, wherein a selected first side gear has a different number of teeth than a selected second side gear; and

assembling the bevel gear system such that the selected first and second side gears rotatably engage the pinion gear, wherein the pinion gear is rotatably disposed on a corresponding pin on a spider and assembling the bevel gear system includes positioning the spider in a case that has a hole that receives the pin, wherein a configuration of the case remains constant regardless of the desired gear ratio and which members of the first and second sets of side gears are selected.

2. The method of claim 1 wherein the selected first side gear has two more teeth than the selected second side gear.

3. The method of claim 2 wherein the selected first side gear is fixedly mounted on a shaft when the bevel gear system is assembled.

4. The method of claim 3 wherein the shaft extends through a spindle and the selected second side gear is fixedly mounted on the spindle when the bevel gear system is assembled.

5. The method of claim 4 wherein the selected second side gear does not rotate about an axis when the bevel gear system is assembled.

6. The method of claim 1 wherein the selected first and second side gears are coaxially disposed.

7. The method of claim 1 wherein the selected second side gear has two more teeth than the selected first side gear.

8. The method of claim 1 wherein the selected first and second side gears have an odd number of teeth.

9. A method of making a bevel gear system comprising:

providing a first set of side gears and a second set of side gears;

determining a first desired gear ratio of the bevel gear system;

selecting a first member of the first set of side gears, designated a first selected first side gear, and a first member of the second set of side gears, designated a first selected second side gear, based on the first desired gear ratio, wherein the first selected first side gear has a different number of teeth than the first selected second side gear; and

assembling the bevel gear system such that the first selected first side gear and the first selected second side gear engage each member of a set of pinion gears, wherein each member of the set of pinion gears is rotatably disposed on a corresponding pin on a spider and assembling the bevel gear system includes positioning the spider in a case that has a hole that receives at least one pin, wherein a configuration of the spider remains constant regardless of the desired gear ratio and regardless of which members of the first and second sets of side gears are selected.

10. The method of claim 9 wherein each member of the first set of side gears has a different number of teeth and each member of the second set of side gears has a different number of teeth.

11. The method of claim 10 wherein the pinion gear has a constant number of teeth regardless of which members of the first and second sets of side gears are selected.

12. The method of claim 9 wherein the pinion gear has fewer teeth than the first selected first side gear and the first selected second side gear.

13. The method of claim 9 wherein the spider has at least one pin disposed along a first axis and at least one pin disposed along a second axis, wherein a member of the set of pinion gears is rotatably disposed on each pin.

14. The method of claim 13 wherein the configuration of the spider including an angle between the first axis and the second axis remains constant regardless of which member of the first set of side gears is selected.

15. The method of claim 9 wherein the method further comprises:

determining a second desired gear ratio that differs from the first desired gear ratio;

selecting a second member of the first set of side gears and a second member of the second set of side gears that together correspond to the second desired gear ratio, wherein the second member of the first set of side gears has a different number of teeth than the first member of the first set of side gears; and

assembling a second bevel gear system having the second desired gear ratio such that the second member of the first set of side gears and the second member of the second set of side gears both engage a member of a set of pinion gears, wherein the member of the set of pinion gears is rotatably disposed on a corresponding pin on a spider of the second bevel gear system.

16. The method of claim 15 wherein the second member of the first set of side gears has a different number of teeth than the second member of the second set of side gears.

17. The method of claim 16 wherein the first member of the second set of side gears has a different number of teeth than the second member of the second set of side gears.

18. The method of claim 15 wherein the bevel gear system and the second bevel gear system have pinion gears having the same configuration and spiders having the same configuration.