# US 2019/0170140 A1 · Drive device

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- Number: US 2019/0170140 A1
- Document ID: US20190170140A1
- Status: Published application
- Kind: A1
- Application number: 16/323,641
- Filed: 2017-08-08
- Published: 2019-06-06
- Earliest claimed: 2016-08-09
- Assignees: Nidec Corporation
- Applicants: Nidec Corporation
- Inventors: Yasuo YAMAGUCHI
- Web page: https://patentgrep.com/patent/US20190170140A1

## CPC

- F04C 2/10: of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C 2/084: {Toothed wheels}
- F04C 2/102: {the two members rotating simultaneously around their respective axes}
- F04C 15/0088: {Lubrication (of machines or engines in general F01M)}
- F04C 15/0096: {Heating; Cooling (of machines or engines in general F01P)}
- F04C 15/06: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F16N 7/40: in a closed circulation system
- H02K 5/203: {specially adapted for liquids, e.g. cooling jackets}
- H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K 11/225: Detecting coils
- F04C 2/103: {one member having simultaneously a rotational movement about its own axis and an orbital movement}
- F04C 11/008: {Enclosed motor pump units}
- F04C 13/002: {for homogeneous viscous liquids}
- F04C 13/005: {Removing contaminants, deposits or scale from the pump; Cleaning}
- F04C 2210/14: Lubricant
- F04C 2210/206: Oil
- F04C 2240/30: Casings or housings
- F16K 17/04: spring-loaded
- F16N 1/00: Constructional modifications of parts of machines or apparatus for the purpose of lubrication
- F16N 13/20: Rotary pumps (with distributing equipment F16N13/22)
- F16N 2210/18: Electric motors
- F16N 2280/00: Valves
- H02K 1/12: Stationary parts of the magnetic circuit
- H02K 1/22: Rotating parts of the magnetic circuit
- H02K 7/003: {Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28)}
- H02K 9/193: with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F16N: LUBRICATING
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

A drive device includes a rotor, a stator, a housing including an accommodation portion to store oil, and a pump driven through a motor shaft. The pump includes an external gear fixed to an end on one side in an axial direction of the motor shaft, an internal gear surrounding a radial outside of the external gear and meshing with the external gear, a pump room accommodating the internal gear and the external gear, a suction port through which the oil is to be sucked into the pump room, and a discharge port through which the oil is to be discharged from the pump room. The housing includes an outer lid in which the pump room is provided. The outer lid includes a shaft insertion hole that penetrates the outer lid from a surface on the other side in the axial direction of the pump room to a surface on the other side in the axial direction of the outer lid, the motor shaft being inserted into the shaft insertion hole, and a support defining at least a portion of the surface on the other side in the axial direction of the pump room and at least a portion of a radially inside surface of the shaft insertion hole. The support journals the motor shaft on the radial outside of the motor shaft.

## Claims

### Claim at position 1

1-9. (canceled)

### Claim 10

A drive device comprising:
a rotor including a motor shaft disposed along a center axis extending in one direction and a rotor core fixed to the motor shaft;
a stator radially opposed to the rotor with a gap interposed between the stator and the rotor;
a housing including an accommodation portion to store oil and accommodate the rotor and the stator; and
a pump driven through the motor shaft; wherein
the pump includes:
an external gear fixed to an end on one side in an axial direction of the motor shaft;
an internal gear that surrounds a radial outside of the external gear and meshes with the external gear;
a pump room accommodating the internal gear and the external gear;
a suction port through which the oil is to be sucked into the pump room; and
a discharge port through which the oil is to be discharged from the pump room;
the housing includes an outer lid in which the pump room is provided;
the outer lid includes:
a shaft insertion hole penetrating the outer lid from a surface on the other side in the axial direction of the pump room to a surface on the other side in the axial direction of the outer lid, the motor shaft being inserted into the shaft insertion hole; and
a support defining at least a portion of the surface on the other side in the axial direction of the pump room and at least a portion of a radially inside surface of the shaft insertion hole; and
the support journals the motor shaft on a radial outside of the motor shaft.

### Claim 11 (depends on 10)

The drive device according to claim 10, wherein
the housing includes a first oil passage connected to the discharge port; and
the motor shaft includes:
a second oil passage located in the motor shaft and connected to the first oil passage; and
a first through-hole that connects the second oil passage and an outer circumferential surface of the motor shaft and is connected to an inside of the accommodation portion.

### Claim 12 (depends on 11)

The drive device according to claim 11, wherein
the motor shaft includes a second through-hole connecting the second oil passage and the outer circumferential surface of the motor shaft; and
the second through-hole is open to an outer circumferential surface of a portion of the motor shaft radially opposed to the support.

### Claim 13 (depends on 11)

The drive device according to claim 11, wherein the motor shaft includes:
a motor shaft body to which the rotor core is fixed; and
a mount fixed to one side in the axial direction of the motor shaft body, the external gear being fixed to the mount; and
the support journals the mount.

### Claim 14 (depends on 13)

The drive device according to claim 13, wherein
the motor shaft body includes a hole extending from an end on one side in the axial direction of the motor shaft body toward the other side in the axial direction;
the mount is fitted in and fixed to the hole, and has a tubular shape that is open to both axial sides; and
the second oil passage includes a portion axially connecting an inside of the mount and the hole, and is connected to the first oil passage through the inside of the mount.

### Claim 15 (depends on 10)

The drive device according to claim 10, wherein
the rotor includes a cylindrical bush fitted in and fixed to the motor shaft; and
at least a portion of the bush is radially disposed between the support and the motor shaft.

### Claim 16 (depends on 10)

The drive device according to claim 10, wherein the support has an annular shape surrounding the radial outside of the motor shaft.

### Claim 17 (depends on 10)

The drive device according to claim 10, wherein a portion of the motor shaft to which the external gear is fixed is an increased diameter portion in which an outer diameter is increased from the other side in the axial direction toward one side in the axial direction, and the portion of the motor shaft is opposed to one side in the axial direction of the support.

### Claim 18 (depends on 17)

The drive device according to claim 17, wherein a gap is axially provided between the increased diameter portion and the support.