Electric pump apparatus

Patent metadata

Field	Value
Publication number	US-10378525-B2
Application number	US-201514740357-A
Country	US
Kind code	B2
Filing date	Jun 16, 2015
Priority date	Jul 2, 2014
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

A motor-driven apparatus includes a pump and a servo motor connected respectively to outer sides of opposed upstanding support plates. A pump shaft and a servo motor shaft extend horizontally toward each other into a space between the support plates and are coupled together by a flexible coupling. The servo motor includes a fan cover enclosing and spaced from a motor frame of the servo motor. A cooling fan disposed inside the fan cover circulates air in the space between the fan cover and the motor frame to air-cool the motor frame.

First claim

What is claimed is:

1. A motor-driven pump apparatus mountable on a horizontal mounting surface of a machine base, the motor-driven pump apparatus comprising:
a base portion configured to be mounted on a horizontal mounting surface of a machine base;
a pump-side support plate and a motor-side support plate extending upwardly from the base portion in spaced-apart relationship from each other;
a pump comprising a pump flange connected to an outer side of the pump-side support plate, and a rotary pump shaft extending horizontally through openings in the pump flange and the pump-side support plate and terminating at a front end in the space between the pump-side and the motor-side support plates;
a vibration absorbing ring interposed between the outer side of the pump-side support plate and the pump flange for absorbing vibrations generated by the pump, the vibration absorbing ring having an inner section overlapping the opening in the pump-side support plate and connected to the pump flange, and an outer section not overlapping the opening in the pump-side support plate and connected to the pump-side support plate;
a servo motor comprising a motor flange connected to an outer side of the motor-side support plate, a rotary motor shaft extending horizontally through openings in the motor flange and the pump-side support plate and terminating at a front end in the space between the pump-side and the motor-side support plates, a rotor mounted on the motor shaft, a stator surrounding the rotor, a motor frame connected to the motor flange and enclosing the rotor and the stator, a sensor connected to a rear end of the motor shaft, a fan cover enclosing both the sensor and a major lengthwise portion of the motor frame, and a cooling fan disposed inside the fan cover to circulate air in a space between the fan cover and the motor frame to air-cool the motor frame; and
a coupling disposed in the space between the pump-side and the motor-side support plates and interconnecting the pump shaft and the motor shaft.

2. A motor-driven pump apparatus according to claim 1 ; wherein the pump comprises a variable displacement pump.

3. A motor-driven pump apparatus according to claim 2 ; wherein the variable displacement pump is an axial piston pump.

4. A motor-driven pump apparatus according to claim 3 ; wherein the coupling comprises a flexible coupling.

5. A motor-driven pump apparatus according to claim 4 ; wherein the flexible coupling comprises a first flange fastened to the front end portion of the motor shaft, a second flange fastened to the front end portion of the pump shaft, and flexible members interposed between and connected to the first and the second flanges.

6. A motor-driven pump apparatus according to claim 5 ; wherein the flexible members comprise spring leaves.

7. A motor-driven pump apparatus according to claim 6 ; wherein the first flange is fastened to the motor shaft by a first lock bolt and the second flange is fastened to the pump shaft by a second lock bolt, at least one of the lock bolts being situated in the space between the pump-side and the motor-side support plates and being accessible from outside the apparatus.

8. A motor-driven pump apparatus according to claim 1 ; wherein the coupling comprises a flexible coupling.

9. A motor-driven pump apparatus according to claim 8 ; wherein the flexible coupling comprises a first flange fastened to the front end portion of the motor shaft, a second flange fastened to the front end portion of the pump shaft, and flexible members interposed between and connected to the first and the second flanges.

10. A motor-driven pump apparatus according to claim 9 ; wherein the flexible members comprise spring leaves.

11. A motor-driven pump apparatus according to claim 10 ; wherein the first flange is fastened to the motor shaft by a first lock bolt and the second flange is fastened to the pump shaft by a second lock bolt, at least one of the lock bolts being situated in the space between the pump-side and the motor-side support plates and being accessible from outside the apparatus.

12. A motor-driven pump apparatus according to claim 1 ; wherein the inner section of the vibration absorbing ring is bolted to the pump flange, and the outer section of the vibration absorbing ring is bolted to the pump-side support plate.

13. A motor-driven pump apparatus according to claim 1 ; wherein the pump-side support plate and the motor-side support plate extend upwardly to the same level and constitute respectively the sole support for the pump and the motor.

Assignees

• Nissei Plastics Ind Co

Inventors

• Nakamura Toshiaki
• Hayashi Kenichi
• Tanemura Daiki

Classifications

• F04C15/008

  Prime movers · CPC title

• F04B17/03 Primary

  driven by electric motors · CPC title

• F04C2230/604

  Mounting devices for pumps or compressors · CPC title

• F04B53/16

  Casings; Cylinders; Cylinder liners or heads; Fluid connections · CPC title

• F01C21/007

  General arrangements of parts; Frames and supporting elements · CPC title