Power transmitting system of a vehicle

Patent metadata

Field	Value
Publication number	US-9404563-B2
Application number	US-201514715076-A
Country	US
Kind code	B2
Filing date	May 18, 2015
Priority date	May 21, 2014
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

Power system including differential-mechanism, clutch-mechanism, power-mechanism and dog-clutch disposed between an input rotary member to receive drive-force from a drive power source and output rotary-member to transmit drive-force to drive-wheels, the differential-mechanism including an input rotary element, output rotary element and reaction rotary element; the clutch-mechanism connecting two rotary elements of the input, output and reaction rotary elements of the differential-mechanism, to each other, the power-mechanism having predetermined gear ratio, and dog-clutch selectively placing a power path between the output rotary element and output rotary-member, in power transmitting state and power cutoff state; transmitting drive-force to drive-wheels while the clutch-mechanisms and dog-clutch are placed in engaged states. The dog-clutch engagement retainer mechanism holds the dog-clutch in engaged state while the power system turns in parking-lock-position inhibiting output rotary-member motion, and switching the dog-clutch from engaged to released when the power system switches to non-parking-lock position permitting the output rotary-member motion.

First claim

What is claimed is:

1. A power transmitting system of a vehicle, comprising a differential mechanism, a clutch mechanism, a power transmitting mechanism and a dog clutch which are disposed between an input rotary member provided to receive a drive force from a drive power source of the vehicle and an output rotary member provided to transmit the drive force to drive wheels of the vehicle, said differential mechanism including an input rotary element, an output rotary element and a reaction rotary element, said clutch mechanism selectively connecting two rotary elements of said input, output and reaction rotary elements of said differential mechanism, to each other, said power transmitting mechanism having a predetermined gear ratio, and said dog clutch being configured to selectively place a power transmitting path between said output rotary element and said output rotary member, in a power transmitting state and a power cutoff state, and wherein said drive force is transmitted to said drive wheels while both of said clutch mechanism and said dog clutch are placed in engaged states, said power transmitting system further comprising:
a dog-clutch engagement retainer mechanism configured to mechanically hold said dog clutch in the engaged state while the power transmitting system is placed in a parking lock position for mechanically inhibiting a rotary motion of said output rotary member, and to switch said dog clutch from the engaged state to a released state when the power transmitting system is switched to a non-parking-lock position for mechanically permitting the rotary motion of said output rotary member.

2. The power transmitting system according to claim 1 , further comprising:
a clutch switching member configured to switch said dog clutch between the engaged state and the released state; and
a parking lock switching member configured to switch the power transmitting system between the parking lock position and the non-parking-lock position,
and wherein said dog-clutch engagement retainer mechanism mechanically holds said dog clutch in the engaged state, by holding said clutch switching member and said parking lock switching member in engagement with each other while the clutch switching member is located at a position for placing the dog clutch in the engaged state and while the parking lock switching member is located at a position for placing the power transmitting system in the parking lock position.

3. A power transmitting system of a vehicle, comprising a differential mechanism, a clutch mechanism, a power transmitting mechanism, a dog clutch, a clutch switching member, and a parking lock switching member, which are disposed between an input rotary member provided to receive a drive force from a drive power source of the vehicle and an output rotary member provided to transmit the drive force to drive wheels of the vehicle, said differential mechanism including an input rotary element, an output rotary element and a reaction rotary element, said clutch mechanism selectively connecting two rotary elements of said input, output and reaction rotary elements of said differential mechanism, to each other, said power transmitting mechanism having a predetermined gear ratio, said dog clutch being configured to selectively place a power transmitting path between said output rotary element and said output rotary member, in a power transmitting state and a power cutoff state, said clutch switching member being configured to switch said dog clutch between an engaged state and a released state, and said parking lock switching member being configured to switch the power transmitting system between a parking lock position for mechanically inhibiting a rotary motion of said output rotary member, and a non-parking-lock position for mechanically permitting the rotary motion of said output rotary member, and wherein said drive force is transmitted to said drive wheels while said clutch mechanism is placed in an engaged state and while said dog clutch is placed in the engaged state, said power transmitting system wherein:
said clutch switching member includes a protrusion;
said parking lock switching member includes a hook portion which is held in engagement with said protrusion of said clutch switching member located at a position for placing said dog clutch in the engaged state when the power transmitting system is placed in the parking lock position, and is not held in engagement with said protrusion when the power transmitting system is placed in the non-parking-lock position; and
said protrusion prevents a movement of said clutch switching member toward a position for placing said dog clutch in the released state, when the protrusion is held in engagement with said hook portion of said parking lock switching member.

4. The power transmitting system according to claim 3 , wherein said protrusion functions to provide a ratchet device which permits a movement of said clutch switching member relative to said hook portion toward the position for placing said dog clutch in the engaged state, and prevents the movement of said the clutch switching member toward the position for placing the dog clutch in the released state.

5. The power transmitting system according to claim 1 , further comprising a continuously variable transmission disposed in parallel with said power transmitting mechanism, between said input rotary member and said output rotary member, and a first clutch configured to selectively place a first power transmitting path through which the drive force is transmitted from said drive power source to said drive wheels through said continuously variable transmission, in a power transmitting state and in a power cutoff state, and wherein said power transmitting mechanism includes a gear mechanism having at least one gear position, and said differential mechanism is disposed in a second power transmitting path through which the drive force is transmitted from the drive power source to the drive wheels through said power transmitting mechanism, said clutch mechanism selectively places said second power transmitting path in a power transmitting state and in a power cutoff state, and said dog clutch is disposed between said clutch mechanism and said output rotary member, to selectively place said second power transmitting path in said power transmitting and power cutoff states.

6. The power transmitting system according to claim 3 , further comprising a continuously variable transmission disposed in parallel with said power transmitting mechanism, between said input rotary member and said output rotary member, and a first clutch configured to selectively place a first power transmitting path through which the drive force is transmitted from said drive power source to said drive wheels through said continuously variable transmission, in a power transmitting state and in a power cutoff state, and wherein said power transmitting mechanism includes a gear mechanism having at least one gear position, and said differential mechanism is disposed in a second power transmitting path through which the drive force is transmitted from the drive power source to the drive wheels through said power transmitting mechanism, said clutch mechanism selectively places said second power transmitting path in a power transmitting state and in a power cutoff state, and said dog clutch is disposed between said clutch mechanism and said output rotary member, to selectively place said second power transmitting path in said power transmitting and power cutoff states.

Assignees

• Toyota Motor Co Ltd

Inventors

• Yamamoto Kozo
• Yoshida Michio
• Nakada Hirofumi
• Matsuo Kenji
• Fukao Mitsuhiro
• Moriyama Shuji
• Iwatsuru Yuji

Classifications

• F16H2200/2094

  using positive clutches, e.g. dog clutches · CPC title

• F16H2037/026

  Layouts with particular features of reversing gear, e.g. to achieve compact arrangement · CPC title

• F16H61/22

  Locking {of the control input devices} (constructional features of locking or disabling mechanisms F16H63/34) · CPC title

• F16H37/0846 Primary

  CVT using endless flexible members · CPC title

• F16H37/0833

  with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths · CPC title