Park brake mechanism for integrated transmission and transfer case
First Claim
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1. A park brake mechanism for braking a drive line that transmits power to the wheels of a motor vehicle, comprising:
- an epicyclic gearset driveably connected to the input and the output, adapted to produce alternately a high range of output speed and a low range of output speed;
a coupler including a selector moveable alternately between a first position where the gearset produces the high range, and a second position where the gearset produces the low range;
a park gear driveably connected to the input;
a pawl supported for releasable engagement with the park gear and preventing rotation of the park gear due to such engagement;
a gear selector moveable among positions representing operating ranges of a transmission, the positions including a park position; and
a connector attached to the gear selector and the pawl, adapted to transmit movement of the gear selector to the pawl, the pawl engaging the park gear and preventing rotation of the park gear in response to movement of the gear selector to the park position.
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Abstract
In a motor vehicle driveline having an automatic transmission driveably connected to a transfer case, a park gear, continually driveably connected through a planetary gear set to the drive wheels of the vehicle, is alternately fixed against rotation on the transfer case or released to rotate freely in response to movement of a gear selector having a park position. When the gear selector is moved to the park position, a pawl holds the drive wheels against rotation. When the gear selector is moved from the park position, the drive wheels are free to rotate without restraint of the park mechanism.
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Citations
12 Claims
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1. A park brake mechanism for braking a drive line that transmits power to the wheels of a motor vehicle, comprising:
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an epicyclic gearset driveably connected to the input and the output, adapted to produce alternately a high range of output speed and a low range of output speed;
a coupler including a selector moveable alternately between a first position where the gearset produces the high range, and a second position where the gearset produces the low range;
a park gear driveably connected to the input;
a pawl supported for releasable engagement with the park gear and preventing rotation of the park gear due to such engagement;
a gear selector moveable among positions representing operating ranges of a transmission, the positions including a park position; and
a connector attached to the gear selector and the pawl, adapted to transmit movement of the gear selector to the pawl, the pawl engaging the park gear and preventing rotation of the park gear in response to movement of the gear selector to the park position. - View Dependent Claims (2, 3, 4)
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5. A park mechanism for braking the wheels of a motor vehicle, comprising:
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a casing fixed against rotation, including a power input and an output;
an epicyclic gearset driveably connected to the input and the output, adapted to produce alternately a high range of output speed and a low range of output speed;
a coupler continually driveably connected to a first component of the gearset, and adapted for alternate drive connections to a second component of the gearset and to the casing, including a selector moveable alternately between a first position where the gearset produces the high range, and a second position where the gearset produces the low range;
a park gear driveably connected to the input;
a pawl supported for releasable engagement with the park gear and preventing rotation of the park gear due to such engagement;
a gear selector moveable among positions representing operating ranges of a transmission, the positions including a park position; and
a connector attached to the gear selector and the pawl, adapted to transmit movement of the gear selector to the pawl, the pawl engaging the park gear and preventing rotation of the park gear in response to movement of the gear selector to the park position. - View Dependent Claims (6, 7, 8)
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9. An integrated transfer case and transmission assembly for transmitting power to the wheels of a motor vehicle and for braking the vehicle, comprising:
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a first case fixed against rotation, having a first opening, including an input and an output;
a second case secured to the first case, having a second opening aligned with the first opening, including an output driveably connected to the input through the first and second openings;
a sun gear driveably connected to the input;
a carrier driveably connected to the output of the first case;
a ring gear;
a set of planet pinions rotatably supporting on the carrier in meshing engagement with the sun gear and ring gear;
a coupler driveably connected to the ring gear, including a selector moveable alternately between a first position where the coupler completes a drive connection between the first case and ring gear, and a second position where the coupler mutually driveably connects the ring gear and one of the group consisting of the sun gear and carrier;
a park gear driveably connected to the input; and
a pawl supported for releasable engagement with the park gear and preventing rotation of the park gear due to such engagement;
a gear selector moveable among positions representing operating ranges of a transmission, the positions including a park position; and
a connector attached to the gear selector and the pawl, adapted to transmit movement of the gear selector to the pawl, the pawl engaging the park gear and preventing rotation of the park gear in response to movement of the gear selector to the park position. - View Dependent Claims (10, 11, 12)
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Specification