Vehicle drive transmission device

Patent metadata

Field	Value
Publication number	US-12055199-B2
Application number	US-202118031083-A
Country	US
Kind code	B2
Filing date	Oct 19, 2021
Priority date	Nov 10, 2020
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

In a vehicle drive transmission device, a transmission includes an intermesh first engagement device, a frictional second engagement device, a first drive device configured to drive the first engagement device, and a second drive device configured to drive the second engagement device. The first drive device includes a first shift drum, a first cam mechanism configured to convert rotational motion of the first shift drum into linear motion, and a first transmission mechanism configured to perform the linear motion. The second drive device includes a second shift drum, a second cam mechanism configured to convert rotational motion of the second shift drum into linear motion, and a second transmission mechanism configured to perform the linear motion. The first shift drum and the second shift drum are connected so as to rotate integrally with each other via a drive shaft. A drum drive source is provided to drive the drive shaft.

First claim

The invention claimed is:

1. A vehicle drive transmission device comprising:
an input member drivingly connected to a driving force source for a wheel;
an output member drivingly connected to the wheel; and
a transmission configured to form a plurality of shift speeds including a first shift speed and a second shift speed having a smaller speed ratio than the first shift speed, and to change a speed of rotation transmitted from a side of the input member at a speed ratio corresponding to a formed shift speed among the plurality of shift speeds and transmit the rotation to a side of the output member, wherein
the transmission includes an intermesh first engagement device, a frictional second engagement device, a first drive device configured to drive the first engagement device, and a second drive device configured to drive the second engagement device,
the first shift speed is formed when the first engagement device is engaged and the second engagement device is disengaged, and the second shift speed is formed when the first engagement device is disengaged and the second engagement device is engaged,
the first drive device includes a rotatably supported first shift drum, a first cam mechanism configured to convert rotational motion of the first shift drum into linear motion, and a first transmission mechanism configured to perform linear motion by the first cam mechanism,
the second drive device includes a rotatably supported second shift drum, a second cam mechanism configured to convert rotational motion of the second shift drum into linear motion, and a second transmission mechanism configured to perform linear motion by the second cam mechanism,
the first shift drum and the second shift drum are connected so as to rotate integrally with each other via a drive shaft, and
a drum drive source is provided to drive the drive shaft to rotate the first shift drum and the second shift drum.

2. A vehicle drive transmission device comprising:
an input member drivingly connected to a driving force source for a wheel;
an output member drivingly connected to the wheel; and
a transmission configured to form a plurality of shift speeds including a first shift speed and a second shift speed having a smaller speed ratio than the first shift speed, and to change a speed of rotation transmitted from a side of the input member at a speed ratio corresponding to a formed shift speed among the plurality of shift speeds and transmit the rotation to a side of the output member, wherein
the transmission includes an intermesh first engagement device, a frictional second engagement device, an intermesh third engagement device, a first drive device configured to drive the first engagement device, and a second drive device configured to drive the second engagement device,
the first shift speed is formed when the first engagement device is engaged and both the second engagement device and the third engagement device are disengaged, and the second shift speed is formed when the first engagement device is disengaged and at least one of the second engagement device and the third engagement device is engaged,
the first drive device includes a rotatably supported first shift drum, a first cam mechanism configured to convert rotational motion of the first shift drum into linear motion, and a first transmission mechanism configured to perform linear motion by the first cam mechanism,
the second drive device includes a rotatably supported second shift drum, a second cam mechanism configured to convert rotational motion of the second shift drum into linear motion, and a second transmission mechanism configured to perform linear motion by the second cam mechanism,
the first shift drum and the second shift drum are connected so as to rotate integrally with each other via a drive shaft, and
a drum drive source is provided to drive the drive shaft to rotate the first shift drum and the second shift drum.

3. The vehicle drive transmission device according to claim 1 , wherein
the first transmission mechanism includes a first elastic member having elasticity in a direction of the linear motion of the first transmission mechanism, and is configured to transmit a driving force from the first cam mechanism to the first engagement device via the first elastic member, and
the second transmission mechanism includes a second elastic member having elasticity in a direction of the linear motion of the second transmission mechanism, and is configured to transmit a driving force from the second cam mechanism to the second engagement device via the second elastic member.

4. The vehicle drive transmission device according to claim 1 , wherein
the transmission further includes an intermesh third engagement device,
assuming that a direction along the linear motion of the first transmission mechanism is a first direction,
the third engagement device is disposed to adjoin the first engagement device in the first direction and is driven by the first drive device, and
the first shift speed is formed when the first engagement device is engaged and both the second engagement device and the third engagement device are disengaged, and the second shift speed is formed when the first engagement device is disengaged and at least one of the second engagement device and the third engagement device is engaged.

5. The vehicle drive transmission device according to claim 4 , wherein
the first cam mechanism includes a first cam path that is provided along a rotation direction of the first shift drum and changes in phase in response to rotation of the first shift drum,
the second cam mechanism includes a second cam path that is provided along a rotation direction of the second shift drum and changes in phase in response to rotation of the second shift drum,
the first transmission mechanism is configured to drive the first engagement device and the third engagement device by performing linear motion depending on the phase of the first cam path,
the second transmission mechanism is configured to drive the second engagement device by performing linear motion depending on the phase of the second cam path,
the first cam path includes, in the following stated order along the rotation direction of the first shift drum, a first keeping portion that keeps a neutral phase, a first transition portion that transitions from the neutral phase to a first phase, a second keeping portion that keeps the first phase, a second transition portion that transitions from the first phase to the neutral phase, a third keeping portion that keeps the neutral phase, a third transition portion that transitions from the neutral phase to a second phase, a fourth keeping portion that keeps the second phase, and a fourth transition portion that transitions from the second phase to the neutral phase,
in the neutral phase, the first transmission mechanism disengages both the first engagement device and the third engagement device,
in the first phase, the first transmission mechanism engages the first engagement device and disengages the third engagement device,
in the second phase, the first transmission mechanism disengages the first engagement device and engages the third engagement device,
the second cam path includes, in the following stated order along the rotation direction of the second shift drum, a fifth keeping portion that keeps a disengagement phase, a fifth transition portion that transitions from the disengagement phase to an engagement phase, a sixth keeping portion that keeps the engagement phase, and a sixth transition portion that transitions from the engagement phase to the disengagement phase,
in the engagement phase, the second transmission mechanism engages the second engagement device,
in the disengagement phase, the second transmission mechanism disengages the second

Assignees

• Aisin Corp

Inventors

• Kuribayashi Fumiaki
• Habara Yuki
• Kida Eiji
• Ishida Kenji

Classifications

• F16H2200/0034

  the gear ratios comprising two forward speeds · CPC title

• F16H2063/3073

  final output mechanisms mounted on a single shaft · CPC title

• F16H2063/3056

  using cam or crank gearing · CPC title

• F16H63/3069

  Interrelationship between two or more final output mechanisms · CPC title

• F16H63/3043

  comprising friction clutches or brakes · CPC title