04-01-14, 05:07 PM
oh, and the gear type depends on application really. Straight cut involutes are the most common form of gears, followed closely by helical gears.
dog gears are generally not used for running together, they are used for meshing purposes mainly (they dont run together well due to the missing tooth nature of them).
bevel gears (straight or spiral) are used to transmit vertical force to horzontal rotation (and hypoid gears are a sort of curved teeth variation of this).
then there is planet gears, which are usually 2 or more planet gears surrounding a sun gear, which is all within a planet carrier (and/or annulus)
there are also a few type of lesser used worm gears (worm gears/herringbone gears).
As I say, the uses of each are basically to suit the applcations, helicals are used over straight cut gears as they are slightly stronger in terms of the forces that can be transmitted through them (to make a spur gear of the same strength as a helical, you would need to make it larger, which can be a problem if space is an issue)
dog gears are generally not used for running together, they are used for meshing purposes mainly (they dont run together well due to the missing tooth nature of them).
bevel gears (straight or spiral) are used to transmit vertical force to horzontal rotation (and hypoid gears are a sort of curved teeth variation of this).
then there is planet gears, which are usually 2 or more planet gears surrounding a sun gear, which is all within a planet carrier (and/or annulus)
there are also a few type of lesser used worm gears (worm gears/herringbone gears).
As I say, the uses of each are basically to suit the applcations, helicals are used over straight cut gears as they are slightly stronger in terms of the forces that can be transmitted through them (to make a spur gear of the same strength as a helical, you would need to make it larger, which can be a problem if space is an issue)