Dynamic sealing encoder assembly

Patent metadata

Field	Value
Publication number	US-10164497-B2
Application number	US-201514960153-A
Country	US
Kind code	B2
Filing date	Dec 4, 2015
Priority date	Dec 5, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

Electric motors are disclosed. The motors are preferably for use in an automated vehicle, although any one or more of a variety of motor uses are suitable. The motors include lift, turntable, and locomotion motors.

First claim

What is claimed is:

1. A motor comprising:
a stator;
a rotor rotatable about an axis;
a housing defining a motor chamber,
said motor chamber housing the stator and the rotor;
an encoder assembly,
said encoder assembly including a rotatable encoder hub and a sensed element secured to the encoder hub to rotate therewith,
said encoder hub including a circumferentially extending sidewall;
a seal configured to dynamically engage the sidewall along an arcuate hub-seal interface to thereby prevent contaminants passing across the hub-seal interface,
said housing defining a seal face,
said seal statically engaging the seal face along an arcuate housing-seal interface to thereby prevent contaminants passing across the housing-seal interface; and
a gear assembly,
said housing further defining a gear chamber housing the gear assembly,
said housing including—
a gearbox case at least in part defining the gear chamber, and
a dust cover at least in part encompassing the gearbox case,
said dust cover defining the seal face.

2. The motor as claimed in claim 1 ,
said encoder hub being positioned axially outside the gearbox case.

3. The motor as claimed in claim 1 ,
said dust cover and said gearbox case cooperatively at least in part defining an encoder chamber,
said sensed element being disposed within the encoder chamber.

4. The motor as claimed in claim 3 ,
said encoder hub defining a gearbox-facing side that further defines the encoder chamber,
said sensed element being secured to the gearbox-facing side.

5. The motor as claimed in claim 1 ,
said dust cover engaging said gearbox case along a dust cover-gearbox case interface to thereby prevent contaminants passing across the dust cover-gearbox case interface.

6. The motor as claimed in claim 5 ,
said dust cover-gearbox case interface including a first section and a second section,
said second section oriented orthogonally relative to the first section such that the dust cover-gearbox case interface is labyrinthine in form.

7. The motor as claimed in claim 5 ,
said housing further including a motor shell at least in part defining the motor chamber,
said motor shell engaging said dust cover along a shell-dust cover interface to thereby prevent contaminants passing across the shell-dust cover interface.

8. The motor as claimed in claim 7 ,
said gearbox case defining an arcuately extending flange adjacent the shell-dust cover interface,
said motor including an O-ring disposed between the flange and the shell-dust cover interface.

9. The motor as claimed in claim 1 ,
said encoder assembly further including a sensor assembly that is stationary relative to the encoder hub and sensed element,
said sensor assembly configured to sense the sensed element and, in turn, the rotation of the encoder hub.

10. The motor as claimed in claim 9 ,
said sensor assembly including a printed circuit board, an encoder chip mounted to the printed circuit board, and a printed circuit board holder.

11. The motor as claimed in claim 1 ,
said sensed element comprising at least one of a position indicator and a direction indicator.

12. The motor as claimed in claim 1 ,
said sensed element comprising a reflective code disc.

13. The motor as claimed in claim 1 ,
rotation of said encoder hub and said sensed element corresponding to rotation of said rotor.

14. A motor comprising:
a stator;
a rotor rotatable about an axis;
a housing defining a motor chamber,
said motor chamber housing the stator and the rotor;
an encoder assembly,
said encoder assembly including a rotatable encoder hub and a sensed element secured to the encoder hub to rotate therewith,
said encoder hub including a circumferentially extending sidewall; and
a seal configured to dynamically engage the sidewall along an arcuate hub-seal interface to thereby prevent contaminants passing across the hub-seal interface,
said encoder hub defining a housing-facing side and an opposite side,
said sensed element being secured to the housing-facing side,
said housing-facing side and said opposite side being axially opposed to each other,
said sidewall projecting axially.

15. The motor as claimed in claim 14 ,
said housing defining a seal face,
said seal statically engaging the seal face along an arcuate housing-seal interface to thereby prevent contaminants passing across the housing-seal interface.

16. The motor as claimed in claim 15 , further comprising:
a gear assembly,
said housing further defining a gear chamber housing the gear assembly.

17. The motor as claimed in claim 16 ,
said housing including—
a gearbox case at least in part defining the gear chamber, and
a dust cover at least in part encompassing the gearbox case,
said dust cover defining the seal face.

18. The motor as claimed in claim 14 ,
said encoder assembly further including a sensor assembly that is stationary relative to the encoder hub and sensed element,
said sensor assembly configured to sense the sensed element and, in turn, the rotation of the encoder hub.

19. A motor comprising:
a stator;
a rotor rotatable about an axis;
a housing defining a motor chamber,
said motor chamber housing the stator and the rotor;
an encoder assembly,
said encoder assembly including a rotatable encoder hub and a sensed element secured to the encoder hub to rotate therewith,
said encoder hub including a circumferentially extending sidewall; and
a seal configured to dynamically engage the sidewall along an arcuate hub-seal interface to thereby prevent contaminants passing across the hub-seal interface,
rotation of said encoder hub and said sensed element corresponding to rotation of said rotor,
said rotor configured to drive rotation of a wheel, such that rotation of said encoder hub and said sensed element corresponds to rotation of said wheel.

20. The motor as claimed in claim 19 ,
said motor further including a wheel hub configured to support said wheel,
said encoder hub circumscribing said wheel hub.

21. The motor as claimed in claim 19 ,
said housing defining a seal face,
said seal statically engaging the seal face along an arcuate housing-seal interface to thereby prevent contaminants passing across the housing-seal interface.

22. The motor as claimed in claim 21 , further comprising:
a gear assembly,
said housing further defining a gear chamber housing the gear assembly.

23. The motor as claimed in claim 22 ,
said housing including—
a gearbox case at least in part defining the gear chamber, and
a dust cover at least in part encompassing the gearbox case,
said dust cover defining the seal face.

24. The motor as claimed in claim 19 ,
said encoder assembly further including a sensor assembly that is stationary relative to the encoder hub and sensed element,
said sensor assembly configured to sense the sensed element and, in turn, the rotation of the encoder hub.

Assignees

• Nidec Motor Corp

Inventors

• Johnson Philip S
• Moore William D

Classifications

• B60B27/0021

  characterised by torque transmission means from drive axle · CPC title

• H02K1/148

  Sectional cores (H02K1/141 takes precedence) · CPC title

• H02K1/185

  to outer stators · CPC title

• F16H1/06

  with parallel axes · CPC title

• F16H57/12

  Arrangements for adjusting or for taking-up backlash not provided for elsewhere · CPC title