# US 8,784,073 B2 · Liquid pressure generating apparatus and driving apparatus

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- Number: US 8,784,073 B2
- Document ID: US8784073B2
- Status: Granted
- Kind: B2
- Application number: 13/231,220
- Filed: 2011-09-13
- Published: 2012-03-29
- Granted: 2014-07-22
- Earliest claimed: 2010-09-24
- Assignees: Aisin Aw Co., Ltd.; Toyota Jidosha Kabushiki Kaisha; NSK-Warner K. K.
- Applicants: Shinichi Nomura; Hiroshi Yoshikawa; Atsushi Mori; Hironari Toyoda; Ryo Watanabe; Haruhisa Suzuki; Akira Iwano
- Inventors: Shinichi Nomura; Hiroshi Yoshikawa; Atsushi Mori; Hironari Toyoda; Ryo Watanabe; Haruhisa Suzuki; Akira Iwano
- Web page: https://patentgrep.com/patent/US8784073B2

## CPC

- B60K 6/445: Differential gearing distribution type
- F16H 61/0028: {using a single pump driven by different power sources}
- F16H 2037/0866: {Power-split transmissions with distributing differentials, with the output of the CVT connected or connectable to the output shaft}
- Y02T 10/62: Hybrid vehicles
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- F16H: GEARING
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A liquid pressure generating apparatus including a pump, and two one-way clutches arranged coaxially with the pump drive shaft in a line in the axial direction on the side of a first axial direction. The pump case includes a projecting portion projecting from the corresponding pump case. Inner races of the respective two one-way clutches are integrated with each other and form a common inner race. Outer races of the respective two one-way clutches are formed independently from each other and are driven respectively by pump driving members different from each other, and directions of restricted relative rotation with respect to the common inner race are identical to each other. The common inner race includes a coupling portion to be coupled to the pump driving shaft on the side of the first axial direction with respect to the projecting portion.

## Claims

### Claim 1

A liquid pressure generating apparatus comprising: a pump having a pump case and a pump drive shaft, and two one-way clutches arranged coaxially with the pump drive shaft in a line in the axial direction on the side of a first axial direction, which is one side of the pump drive shaft, with respect to the pump case, in the axial direction wherein
the pump case includes a projecting portion projecting from the corresponding pump case in the first axial direction, and radially supporting the pump drive shaft from radially outside the corresponding pump drive shaft so as to be capable of rotating relatively with respect to each other,
inner races of the respective two one-way clutches are integrated with each other and form a common inner race,
outer races of the respective two one-way clutches are formed independently from each other and are driven respectively by pump driving members different from each other, and directions of restricted relative rotation with respect to the common inner race are identical to each other,
the common inner race includes a coupling portion to be coupled to the pump driving shaft on the side of the first axial direction with respect to the projecting portion and a body portion extending from the coupling portion in a second axial direction opposite from the first axial direction and having a portion arranged on the radially outside the projecting portion and located at the same axial position as the corresponding projecting portion.

### Claim 2 (depends on 1)

The liquid pressure generating apparatus according to claim 1, wherein both of the projecting portion and the body portion are formed into a cylindrical shape coaxially with the pump driving shaft,
a portion of the body portion on the side of the second axial direction is arranged so as to cover a portion of the projecting portion on the side of the first axial direction from radially outside, and
inner diameters of the outer races of the respective two one-way clutches are identical to each other.

### Claim 3 (depends on 2)

The liquid pressure generating apparatus according to claim 2, wherein the pump drive shaft includes a pressure receiving portion having a surface extending in the direction intersecting the axial direction and receiving a liquid pressure in the first axial direction at the time when the pump is driven, and
a thrust bearing for receiving an axial load is arranged between the common inner race and the supporting portion configured to support the common inner race from the side of the first axial direction.

### Claim 4 (depends on 3)

A driving apparatus comprising: the liquid pressure generating apparatus according to claims 3, a first pump driving member drive-coupled to a driving power source; a second pump driving member drive-coupled to a wheel, and a drive transmission device configured to transmit a driving power selectively between the first pump driving member and the second pump driving member, wherein
an outer race of a first one-way clutch, which is one of the two one-way clutches, is driven by the first pump driving member, and an outer race of a second one-way clutch, which is the other one of those, is driven by the second pump driving member.

### Claim 5 (depends on 3)

A driving apparatus comprising: the liquid pressure generating apparatus according to claims 3, a first pump driving member drive-coupled to a first driving power source; a second pump driving member drive-coupled to a second driving power source, and a drive transmission device configured to transmit a driving power selectively between the first pump driving member and the second pump driving member, wherein
an outer race of the first one-way clutch, which is one of the two one-way clutches, is driven by the first pump driving member, and an outer race of the second one-way clutch, which is the other one of those, is driven by the second pump driving member.

### Claim 6 (depends on 4)

The driving apparatus according to claim 4, comprising: a first dynamo-electric machine and a second dynamo-electric machine as driving power sources, wherein
the drive transmission device includes a differential gear mechanism having at least three rotating elements including a first rotating element, a second rotating element, and a third rotating element,
the first dynamo-electric machine is drive-coupled to the first rotating element, an internal combustion engine is drive-coupled to the second rotating element, and the second dynamo-electric machine and a wheel are drive-coupled to the third rotating element, and
the first pump driving member is driven by the internal combustion engine, and the second pump driving member is driven by the wheel or the second dynamo-electric machine.

### Claim 7 (depends on 6)

The driving apparatus according to claims 6, wherein a first gear which is formed on the outer race of the first one-way clutch and meshes with a gear drive-coupled to the first pump driving member is arranged on the side of the first axial direction with respect to a second gear which is formed on the outer race of the second one-way clutch and meshes with a gear drive-coupled to the second pump driving member, and
the first gear is arranged so as to have a portion located at the same axial position as the coupling portion at least partly.

### Claim 8 (depends on 1)

The liquid pressure generating apparatus according to claim 1, wherein the pump drive shaft includes a pressure receiving portion having a surface extending in the direction intersecting the axial direction and receiving a liquid pressure in the first axial direction at the time when the pump is driven, and
a thrust bearing for receiving an axial load is arranged between the common inner race and the supporting portion configured to support the common inner race from the side of the first axial direction.

### Claim 9 (depends on 1)

A driving apparatus comprising: the liquid pressure generating apparatus according to claim 1, a first pump driving member drive-coupled to a driving power source; a second pump driving member drive-coupled to a wheel, and a drive transmission device configured to transmit a driving power selectively between the first pump driving member and the second pump driving member, wherein
an outer race of a first one-way clutch, which is one of the two one-way clutches, is driven by the first pump driving member, and an outer race of a second one-way clutch, which is the other one of those, is driven by the second pump driving member.

### Claim 10 (depends on 1)

A driving apparatus comprising: the liquid pressure generating apparatus according to claim 1, a first pump driving member drive-coupled to a first driving power source; a second pump driving member drive-coupled to a second driving power source, and a drive transmission device configured to transmit a driving power selectively between the first pump driving member and the second pump driving member, wherein
an outer race of the first one-way clutch, which is one of the two one-way clutches, is driven by the first pump driving member, and an outer race of the second one-way clutch, which is the other one of those, is driven by the second pump driving member.

### Claim 11 (depends on 2)

A driving apparatus comprising: the liquid pressure generating apparatus according to claim 2, a first pump driving member drive-coupled to a driving power source; a second pump driving member drive-coupled to a wheel, and a drive transmission device configured to transmit a driving power selectively between the first pump driving member and the second pump driving member, wherein
an outer race of a first one-way clutch, which is one of the two one-way clutches, is driven by the first pump driving member, and an outer race of a second one-way clutch, which is the other one of those, is driven by the second pump driving member.

### Claim 12 (depends on 11)

The driving apparatus according to claim 11, comprising: a first dynamo-electric machine and a second dynamo-electric machine as driving power sources, wherein
the drive transmission device includes a differential gear mechanism having at least three rotating elements including a first rotating element, a second rotating element, and a third rotating element,
the first dynamo-electric machine is drive-coupled to the first rotating element, an internal combustion engine is drive-coupled to the second rotating element, and the second dynamo-electric machine and a wheel are drive-coupled to the third rotating element, and
the first pump driving member is driven by the internal combustion engine, and the second pump driving member is driven by the wheel or the second dynamo-electric machine.

### Claim 13 (depends on 12)

The driving apparatus according to claim 12, wherein a first gear which is formed on the outer race of the first one-way clutch and meshes with a gear drive-coupled to the first pump driving member is arranged on the side of the first axial direction with respect to a second gear which is formed on the outer race of the second one-way clutch and meshes with a gear drive-coupled to the second pump driving member, and
the first gear is arranged so as to have a portion located at the same axial position as the coupling portion at least partly.

### Claim 14 (depends on 11)

The driving apparatus according to claim 11, wherein a first gear which is formed on the outer race of the first one-way clutch and meshes with a gear drive-coupled to the first pump driving member is arranged on the side of the first axial direction with respect to a second gear which is formed on the outer race of the second one-way clutch and meshes with a gear drive-coupled to the second pump driving member, and
the first gear is arranged so as to have a portion located at the same axial position as the coupling portion at least partly.

### Claim 15 (depends on 2)

A driving apparatus comprising: the liquid pressure generating apparatus according to
claim 2, a first pump driving member drive-coupled to a first driving power source; a second pump driving member drive-coupled to a second driving power source, and a drive transmission device configured to transmit a driving power selectively between the first pump driving member and the second pump driving member, wherein
an outer race of the first one-way clutch, which is one of the two one-way clutches, is driven by the first pump driving member, and an outer race of the second one-way clutch, which is the other one of those, is driven by the second pump driving member.

### Claim 16 (depends on 15)

The driving apparatus according to claim 15, comprising: a first dynamo-electric machine and a second dynamo-electric machine as driving power sources, wherein
the drive transmission device includes a differential gear mechanism having at least three rotating elements including a first rotating element, a second rotating element, and a third rotating element,
the first dynamo-electric machine is drive-coupled to the first rotating element, an internal combustion engine is drive-coupled to the second rotating element, and the second dynamo-electric machine and a wheel are drive-coupled to the third rotating element, and
the first pump driving member is driven by the internal combustion engine, and the second pump driving member is driven by the wheel or the second dynamo-electric machine.

### Claim 17 (depends on 15)

The driving apparatus according to
claims 15, wherein a first gear which is formed on the outer race of the first one-way clutch and meshes with a gear drive-coupled to the first pump driving member is arranged on the side of the first axial direction with respect to a second gear which is formed on the outer race of the second one-way clutch and meshes with a gear drive-coupled to the second pump driving member, and
the first gear is arranged so as to have a portion located at the same axial position as the coupling portion at least partly.

### Claim 18 (depends on 8)

A driving apparatus comprising: the liquid pressure generating apparatus according to claim 8, a first pump driving member drive-coupled to a driving power source; a second pump driving member drive-coupled to a wheel, and a drive transmission device configured to transmit a driving power selectively between the first pump driving member and the second pump driving member, wherein
an outer race of a first one-way clutch, which is one of the two one-way clutches, is driven by the first pump driving member, and an outer race of a second one-way clutch, which is the other one of those, is driven by the second pump driving member.

### Claim 19 (depends on 18)

The driving apparatus according to claim 18, comprising: a first dynamo-electric machine and a second dynamo-electric machine as driving power sources, wherein
the drive transmission device includes a differential gear mechanism having at least three rotating elements including a first rotating element, a second rotating element, and a third rotating element,
the first dynamo-electric machine is drive-coupled to the first rotating element, an internal combustion engine is drive-coupled to the second rotating element, and the second dynamo-electric machine and a wheel are drive-coupled to the third rotating element, and
the first pump driving member is driven by the internal combustion engine, and the second pump driving member is driven by the wheel or the second dynamo-electric machine.

### Claim 20 (depends on 19)

The driving apparatus according to claim 19, wherein a first gear which is formed on the outer race of the first one-way clutch and meshes with a gear drive-coupled to the first pump driving member is arranged on the side of the first axial direction with respect to a second gear which is formed on the outer race of the second one-way clutch and meshes with a gear drive-coupled to the second pump driving member, and
the first gear is arranged so as to have a portion located at the same axial position as the coupling portion at least partly.

### Claim 21 (depends on 18)

The driving apparatus according to claim 18, wherein a first gear which is formed on the outer race of the first one-way clutch and meshes with a gear drive-coupled to the first pump driving member is arranged on the side of the first axial direction with respect to a second gear which is formed on the outer race of the second one-way clutch and meshes with a gear drive-coupled to the second pump driving member, and
the first gear is arranged so as to have a portion located at the same axial position as the coupling portion at least partly.

### Claim 22 (depends on 8)

A driving apparatus comprising: the liquid pressure generating apparatus according to claim 8, a first pump driving member drive-coupled to a first driving power source; a second pump driving member drive-coupled to a second driving power source, and a drive transmission device configured to transmit a driving power selectively between the first pump driving member and the second pump driving member, wherein
an outer race of the first one-way clutch, which is one of the two one-way clutches, is driven by the first pump driving member, and an outer race of the second one-way clutch, which is the other one of those, is driven by the second pump driving member.

### Claim 23 (depends on 22)

The driving apparatus according to claim 22, comprising: a first dynamo-electric machine and a second dynamo-electric machine as driving power sources, wherein
the drive transmission device includes a differential gear mechanism having at least three rotating elements including a first rotating element, a second rotating element, and a third rotating element,
the first dynamo-electric machine is drive-coupled to the first rotating element, an internal combustion engine is drive-coupled to the second rotating element, and the second dynamo-electric machine and a wheel are drive-coupled to the third rotating element, and
the first pump driving member is driven by the internal combustion engine, and the second pump driving member is driven by the wheel or the second dynamo-electric machine.

### Claim 24 (depends on 23)

The driving apparatus according to claim 23, wherein a first gear which is formed on the outer race of the first one-way clutch and meshes with a gear drive-coupled to the first pump driving member is arranged on the side of the first axial direction with respect to a second gear which is formed on the outer race of the second one-way clutch and meshes with a gear drive-coupled to the second pump driving member, and
the first gear is arranged so as to have a portion located at the same axial position as the coupling portion at least partly.

### Claim 25 (depends on 22)

The driving apparatus according to claim 22, wherein a first gear which is formed on the outer race of the first one-way clutch and meshes with a gear drive-coupled to the first pump driving member is arranged on the side of the first axial direction with respect to a second gear which is formed on the outer race of the second one-way clutch and meshes with a gear drive-coupled to the second pump driving member, and
the first gear is arranged so as to have a portion located at the same axial position as the coupling portion at least partly.