Gear reducer drive assembly

A combined worm/spur gear reducer drive assembly for rotating an upper support plate, for example, the boom plate of an aerial lift truck with respect to a stationary lower support, for example, the bed of the truck. The drive assembly includes a one-piece member forming a housing section containing the primary and secondary gear sets and a securing ring mounted between the inner race of a turntable bearing and fixed to one of the upper or lower plates, the outer race of the bearing being secured to the other plate. Spur gear teeth are provided on the external surface of the outer race and the secondary set includes a spur pinion engaging the gear teeth. The one-piece casting and the gear sets housed therein are mounted in the space between the boom plate and the bed plate.

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What is claimed is:

1. In combination with stationary first support means and second support means spaced from said first support means and rotatable with respect thereto, a gear reducer driveassembly comprising a primary worm gear set drive connected to a secondary spur gear set which includes a spur pinion, a turntable bearing mounted between said first and second support means and having inner and outer races, said inner race beingconnected to one of said first and second support means and said outer race being connected to the other of said first and second support means, the external surface of said outer race having spur teeth formed thereon, means for mounting said gearreducer drive assembly between said first and second support means so that said spur pinion engages said teeth on said outer race.

2. The combination of claim 1, said mounting means including a housing section for containing said primary gear set and said pinion of said secondary set and a securing section connected between one of said first and second support means andsaid inner race.

3. In combination with stationary first support means and second support means spaced from said first support means and rotatable with respect thereto, a gear reducer drive assembly comprising a primary worm gear set drive connected to asecondary spur gear set which includes a spur pinion, a turntable bearing mounted between said first and second support means and having inner and outer races, said inner race being connected to one of said first and second support means and said outerrace being connected to the other of said first and second support means, the external surface of said outer race having spur teeth formed thereon, means for mounting said gear reducer drive assembly between said first and second support means so thatsaid spur pinion engages said teeth on said outer race, said mounting means being a one-piece member including a housing section for containing said primary gear set and said pinion of said secondary set and a securing section connected between one ofsaid first and second support means and said inner race, said primary gear set including a first shaft mounted for rotation in said housing section about a generally horizontal axis, a worm on said first shaft and a worm gear, a second shaft mountedwithin said housing for rotation about a generally vertical axis, said worm gear being secured to said second shaft for engagement with said worm, said pinion being secured to said second shaft for engagement with the teeth on said outer race.

4. The combination of claim 3, said securing section including a ring fastened between one of said first and second support means and said inner race.

5. The combination of claim 4, wherein one end of said first shaft includes means for coupling said first shaft to a motor drive and the other end of said first shaft includes means facilitating manual rotation of said first shaft.

6. The combination of claim 3, wherein one end of said first shaft includes means for coupling said first shaft to a motor drive and the other end of said first shaft includes means facilitating manual rotation of said first shaft.

7. The combination of claim 3, comprising grease retainer means mounted between said worm gear and said pinion for retaining grease within said primary gear set.

8. The combination of claim 1, said inner race being connected to said second support means and said outer race being connected to said first support means.

9. The combination of claim 1, said inner race being connected to said first support means and said outer race being connected to said second support means.

10. In combination with stationary first support means and second support means spaced from said first support means and rotatable with respect thereto, a gear reducer drive assembly comprising a primary worm gear set drive connected to asecondary spur gear set which includes a spur pinion, a turntable bearing mounted between said first and second support means and having inner and outer races, said inner race being connected to said second support means and said outer race beingconnected to said first support means, the external surface of said outer race having spur teeth formed thereon, means for mounting said gear reducer drive assembly between said first and second support means so that said spur pinion engages said teethon said outer race, said mounting means including a housing section for containing said primary gear set and said pinion of said secondary set and a securing section connected between said second support means and said inner race.

11. In combination with stationary first support means and second support means spaced from said first support means and rotatable with respect thereto, a gear reducer drive assembly comprising a primary worm gear set drive connected to asecondary spur gear set which includes a spur pinion, a turntable bearing mounted between said first and second support means and having inner and outer races, said inner race being connected to said first support means and said outer race beingconnected to said second support means, the external surface of said outer race having spur teeth formed thereon, means for mounting said gear reducer drive assembly between said first and second support means so that said spur pinion engages said teethon said outer race, said mounting means including a housing section for containing said primary gear set and said pinion of said secondary set and a securing section connected between said first support means and said inner race.