ACCESSORY DRIVE MECHANISM FOR HYBRID VEHICLE

• US 20120266701A1
• Filed: 11/05/2010
• Published: 10/25/2012
• Est. Priority Date: 12/18/2009
• Status: Active Grant

• Current Assignee: UD Trucks Corporation (Isuzu Motors Limited)
• Original Assignee: UD Trucks Corporation (Isuzu Motors Limited)
• Inventors: Tsuchiya, Takayuki, Yamada, Yoshiaki, Hikiri, Kunihiko
• Granted Patent: US 8,770,327 B2
• Time in Patent Office: Days
• US Class Current: 74/15.82
• CPC Class Codes: B60K 6/383 One-way clutches or freewheel devices
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: G16Z 99/00 Subject matter not provided for in other main groups of this subclass
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Abstract

An accessory drive mechanism for a hybrid vehicle, capable of operating accessories irrespective of the travel state of the vehicle, and also capable of smoothly switching between the power which is transmitted from the traveling motor side and the power which is transmitted from the accessory drive motor side. The accessory drive mechanism is provided with a drive power take-off mechanism (20) for taking out the power from a travel drive system (D). An accessory (11) is connected to the drive power take-off mechanism (20). A first one-way clutch (C1) which can transmit the power only to the accessory (11) side is disposed between the drive power take-off mechanism (20) and the accessory (11). An accessory driving motor (an auxiliary motor (12e)) is connected to the side of the accessory (11) which is on the opposite side from the drive power take-off mechanism (20). A second one-way clutch (C2) which can transmit the power only to the accessory (11) side is disposed between the accessory (11) and the accessory driving motor (12).

Claims

1. An accessory drive mechanism for a hybrid vehicle, characterized in that the mechanism comprises a drive power take-off mechanism which takes out a power from a traveling drive system having an engine and a traveling motor, an accessory is connected to the drive power take-off mechanism, a first one-way clutch, which can transmit a power to the accessory side alone, is interposed between the drive power take-off mechanism and the accessory, an accessory driving motor is connected to the accessory on an opposite side of the drive power take-off mechanism, a second one-way clutch, which can transmit a power to the accessory side alone, is interposed between the accessory and the accessory driving motor, the first one-way clutch transmits revolutions but the second one-way clutch does not transmit revolutions in a case that a number of revolutions being transmitted from the drive power take-off mechanism to the accessory is higher than a number of revolutions being transmitted from the accessory driving motor to the accessory, and that the second one-way clutch transmits revolutions but the first one-way clutch does not transmit revolutions in a case that the number of revolutions being transmitted from the accessory driving motor to the accessory is higher than the number of revolutions being transmitted from the drive power take-off mechanism to the accessory.

2. The accessory drive mechanism for a hybrid vehicle according to claim 1, wherein the accessory includes a pump for driving power steering, a compressor for supplying compressed air, and an air-conditioner compressor for compressing a refrigerant in an air conditioner.

3. The accessory drive mechanism for a hybrid vehicle according to claim 2, wherein the power is transmitted from the drive power take-off mechanism to a first accessory system being connected to the pump and the compressor for supplying the compressed air and a second accessory system being connected to the air-conditioner compressor, a first accessory driving motor is connected to the first accessory system and the first and second one-way clutches are interposed in the first accessory system, and a second accessory driving motor is connected to the second accessory system and the first and second one-way clutches are interposed in the second accessory system.

4. The accessory drive mechanism for a hybrid vehicle according to claim 3, wherein a revolution measurement device for measuring the number of revolutions of the traveling drive system and a control device are provided, a measurement result of the revolution measurement device is input to the control device, and the control device has a function of stopping the first and second accessory driving motors in a case that a measurement result of the revolution measurement device is not lower than a predetermined number of revolutions and a function of driving the first accessory driving motor in a case that a measurement result of the revolution measurement device is lower than the predetermined number of revolutions.

5. The accessory drive mechanism for a hybrid vehicle according to claim 4, wherein a signal indicating whether the air conditioner operates is input to the control device, and the control device has a function of driving the second accessory driving motor in a case that the measurement result of the revolution measurement device is lower than the predetermined number of revolutions and the air conditioner operates.

6. The accessory drive mechanism for a hybrid vehicle according to claim 2, wherein the drive power take-off mechanism includes an accessory system connected to the pump and the compressor for supplying the compressed air, a power distribution mechanism which takes out driving power is interposed between the second one-way clutch and the pump and the compressor for supplying the compressed air in the accessory system, the power distribution mechanism is connected to the air-conditioner compressor, and a clutch is provided between the power distribution mechanism and the air-conditioner compressor.

7. The accessory drive mechanism for a hybrid vehicle according to claim 6, wherein a revolution measurement device which measures the number of revolutions of the traveling drive system and a control device are included, a measurement result of the revolution measurement device and a signal indicating whether the air conditioner operates are input to the control device, and the control device has a function of stopping the accessory driving motor in case that the measurement result of the revolution measurement device is not lower than a predetermined number of revolutions, a function of driving the first accessory driving motor in case that the measurement result of the revolution measuring device is lower than the predetermined number of revolutions, a function of disengaging the clutch in a case that the air conditioner does not operate, and a function of engaging the clutch in a case that the air conditioner operates.

9. The accessory drive mechanism for a hybrid vehicle according to claim 1, wherein the output shaft of the drive power take-off mechanism and the output shaft of the accessory driving motor are coaxially arranged in the gearbox, the gearbox comprises:

a ring gear including internal teeth therein and being provided at an output shaft end portion of the drive power take-off mechanism;

a plurality of planetary gears including external teeth which engage with the internal teeth of the ring gear;

a sun gear including external teeth which engage with the external teeth of the planetary gears; and

a planetary gear carrier connecting to rotation centers of the planetary gears, the sun gear is provided at an output shaft end portion of the accessory driving motor, the planetary gear carrier includes a rotating shaft which is coaxial with the output shaft of the accessory driving motor and can rotate relatively to the output shaft of the accessory driving motor, external teeth are formed on an outer edge portion in a radial direction of the planetary gear carrier 32c, the accessory drive mechanism includes a first gear being externally engaged with the external teeth of the planetary gear carrier, and a rotating shaft of the first gear is connected to a pump for driving power steering and a compressor for supplying compressed air.

10. The accessory drive mechanism for a hybrid vehicle according to claim 1, wherein the output shaft of the drive power take-off mechanism and the output shaft of the accessory driving motor are coaxially arranged in the gearbox, first and second pinion gears are provided to an the output shaft of the drive power take-off mechanism and the output shaft of the accessory driving motor, respectively, a pair of third pinion gears which are externally engaged with the pair of first and second pinion gears are provided, the pair of third pinion gears include an identical rod-like member as a rotation center, a ring gear is provided which includes external teeth formed thereon and integrally rotates with the rod-like member, a first gear is provided which is externally engaged with the external teeth of the ring gear, and a rotating shaft of the first gear is connected to a pump for driving a power steering and a compressor for supplying compressed air.

11. The accessory drive mechanism for a hybrid vehicle according to, claim 2, wherein a second gear is provided which is externally engaged with the first gear, a rotating shaft of the second gear is connected to an air-conditioner compressor for compressing a refrigerant in an air conditioner, and a clutch is interposed in the rotating shaft of the second gear.

12. The accessory drive mechanism for a hybrid vehicle according to claim 4, wherein a signal indicative of whether the air conditioner operates is input to the control device, and the control device has a function of disengaging the clutch in a case that an air conditioner does not operate and a function of engaging the clutch in a case that the air conditioner operates.

13. The accessory drive mechanism for a hybrid vehicle according to claim 3, wherein a second gear is provided which is externally engaged with the first gear, a rotating shaft of the second gear is connected to an air-conditioner compressor for compressing a refrigerant in an air conditioner, and a clutch is interposed in the rotating shaft of the second gear.

8. An accessory drive mechanism for a hybrid vehicle, wherein a drive power take-off mechanism, which takes out a power from a traveling drive system including an engine and a traveling motor by means of a wrapping-type transmission mechanism, is provided, an accessory is connected to the drive power take-off mechanism via a gearbox, an output shaft of the drive power take-off mechanism and an output shaft of an accessory driving motor are connected to the gearbox, a first braking device is interposed in an output shaft of the drive power take-off mechanism, a second braking device is interposed in the output shaft of the accessory driving motor, a revolution measurement device which measures a number of revolutions of the traveling drive system and a control device are provided, a measurement result of the revolution measurement device is input to the control device, and the control device has functions of stopping the accessory driving motor, operating the second braking device and releasing the first braking device in a case that a number of revolutions transmitted from the traveling drive system is not lower than a predetermined number of revolutions and functions of driving the accessory driving motor, operating the first braking device and releasing the second braking device in a case that a number of revolutions transmitted from the traveling drive system is lower than the predetermined number of revolutions.