# US 2018/0022207 A1 · Transmission for hybrid vehicle

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- Number: US 2018/0022207 A1
- Document ID: US20180022207A1
- Status: Published application
- Kind: A1
- Application number: 15/341,138
- Filed: 2016-11-02
- Published: 2018-01-25
- Earliest claimed: 2016-07-22
- Assignees: Hyundai Motor Company
- Applicants: Hyundai Motor Company
- Inventors: Soon Ki EO; Chae Hong LIM
- Web page: https://patentgrep.com/patent/US20180022207A1

## CPC

- B60K 6/547: the transmission being a stepped gearing
- B60K 6/36: characterised by the transmission gearings
- B60K 6/48: Parallel type
- F16H 3/006: {power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions}
- F16H 3/091: including a single countershaft
- F16H 3/10: with one or more one-way clutches as an essential feature
- F16H 3/12: with means for synchronisation not incorporated in the clutches
- B60K 2006/4825: {Electric machine connected or connectable to gearbox input shaft}
- B60Y 2200/92: Hybrid vehicles
- F16H 2003/007: {with two flow paths, one being directly connected to the input, the other being connected to the input through a clutch}
- F16H 2200/0021: specially adapted for electric vehicles
- F16H 2200/0043: the gear ratios comprising four forward speeds
- Y02T 10/62: Hybrid vehicles
- Y10S 903/909: Gearing
- Y10S 903/919: Stepped shift
- 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
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A transmission for a hybrid vehicle may include a first input shaft continuously provided with power from an engine, a second input shaft selectively provided with power from the engine via a clutch, a counter shaft coupled to the first input shaft, an output shaft coupled to the second input shaft, a first one-way clutch disposed on a path along which power is transferred from the engine to the output shaft, a motor input shaft provided with power from a motor, a motor-side shift unit comprising a plurality of pairs of gears having different gear ratios, in which one pair of the plurality of pairs of gears suitable to a traveling speed is selected by an engager/disengager, and a second one-way clutch disposed on a path along which power is transferred from the motor to the output shaft.

## Claims

### Claim 1

A transmission for a hybrid vehicle, the transmission comprising:
a first input shaft continuously provided with power from an engine;
a second input shaft selectively provided with power from the engine via a clutch;
a counter shaft coupled to the first input shaft via a plurality of pairs of sub-shift gears having different gear ratios, sub-shift gears in each of the pairs of sub-shift gears being meshed with each other, wherein one pair of the plurality of pairs of sub-shift gears is selected by an engager/disengager such that the counter shaft transfers power;
an output shaft coupled to the second input shaft via a plurality of pairs of main shift gears having different gear ratios, main shift gears in each of the pairs of main shift gears being meshed with each other, wherein one pair of the plurality of pairs of main shift gears is selected by an engager/disengager such that the output shaft transfers power;
a first one-way clutch disposed on a path along which power is transferred from the engine to the output shaft, such that the power is only transferred from the counter shaft in a direction of the output shaft;
a motor input shaft provided with power from a motor;
a motor-side shift unit comprising a plurality of pairs of gears having different gear ratios, gears in each of the plurality of pairs of gears being disposed on the motor input shaft and the output shaft and meshed with each other, wherein one pair of the plurality of pairs of gears suitable to a traveling speed is selected by an engager/disengager; and
a second one-way clutch disposed on a path along which power is transferred from the motor to the output shaft, such that the power is only transferred from the motor input shaft in a direction of the output shaft.

### Claim 2 (depends on 1)

The transmission according to claim 1, wherein
the first input shaft and the second input shaft are concentrically disposed;
the second input shaft comprises a hollow shaft such that the first input shaft is accommodated in the second input shaft; and
the clutch is disposed on a first end of the second input shaft that is positioned closer to the engine.

### Claim 3 (depends on 1)

The transmission according to claim 1, wherein
the output shaft comprises a first output shaft and a second output shaft;
the first input shaft is disposed in parallel to the counter shaft, such that sub-shift gears in each of the pairs of sub-shift gears are meshed with each other; and
the second input shaft is disposed in parallel to the second output shaft, such that main shift gears in each of the pairs of main shift gears are meshed with each other.

### Claim 4 (depends on 1)

The transmission according to claim 1, wherein sub-shift gears in at least one pair of the plurality of pairs of sub-shift gears have an equal gear ratio and main shift gears in at least one pair of the plurality of pairs of main shift gears have an equal gear ratio.

### Claim 5 (depends on 4)

The transmission according to claim 4, wherein the plurality of pairs of sub-shift gears and the plurality of pairs of main shift gears comprise pairs of gears other than pairs of lowest gears and pairs of highest gears.

### Claim 6 (depends on 1)

The transmission according to claim 1, wherein
the second output shaft and the counter shaft are concentrically disposed; and
the first one-way clutch is disposed in a middle of a power transfer path extending from the counter shaft to the first output shaft through the second output shaft.

### Claim 7 (depends on 6)

The transmission according to claim 6, wherein
a power transfer input gear is disposed on the second output shaft;
the first one-way clutch is disposed between the power transfer input gear and the counter shaft;
a power transfer output gear is disposed on the first output shaft; and
a power transfer idling gear is meshed between the power transfer input gear and the power transfer output gear.

### Claim 8 (depends on 3)

The transmission according to claim 3, wherein
the motor-side shift unit comprises a pair of lower gears and a pair of higher gears disposed on the motor input shaft and the first output shaft, gears in each pair of the pair of lower gears and the pair of higher gears being meshed with each other; and
the second one-way clutch is disposed in a middle of a power transfer path extending from the pair of lower gears to the first output shaft.

### Claim 9 (depends on 8)

The transmission according to claim 8, further comprising a synchronizer selectively engaging an output gear of the pair of lower gears and the first output shaft,
wherein the second one-way clutch is disposed between the synchronizer and the first output shaft.

### Claim 10 (depends on 1)

The transmission according to claim 1, wherein
the output shaft and the counter shaft are concentrically disposed; and
the first one-way clutch is disposed between the counter shaft and the output shaft.

### Claim 11 (depends on 10)

The transmission according to claim 10, wherein
a power transfer member is disposed on the output shaft; and
the first one-way clutch is disposed between the power transfer member and the counter shaft.

### Claim 12 (depends on 1)

The transmission according to claim 1, wherein the plurality of pairs of gears of the motor-side gear shift unit comprises a pair of lower gears and a pair of higher gears disposed on the motor input shaft and the output shaft, gears in each pair of the pair of lower gears and the pair of higher gears being meshed with each other, and
the second one-way clutch is disposed in a middle of a power transfer path extending from the pair of lower gears to the output shaft.

### Claim 13 (depends on 12)

The transmission according to claim 12, further comprising a synchronizer selectively engaging an output gear of the pair of lower gears and the output shaft, wherein the second one-way clutch is disposed between the synchronizer and the output shaft.