Unit
Provided is a unit including: an input element; an output element; first to third engagement elements; a first planetary gear mechanism in which the first to third rotational elements are arranged in this order on an alignment chart; and a second planetary gear mechanism in which fourth to sixth rotational elements are arranged in this order on the alignment chart. The input element is connected to the first rotational element, the output element is connected to the second rotational element and the sixth rotational element, one side of the first engagement element is connected to the fifth rotational element, the other side of the first engagement element is fixed, one side of the second engagement element is connected to the third rotational element and the fourth rotational element, the other side of the second engagement element is fixed, and the third engagement element connects two rotational elements that are selected from the first to sixth rotational elements and are not connected to each other.
1 . A unit comprising:
an input element;
an output element;
a first engagement element;
a second engagement element;
a third engagement element;
a first planetary gear mechanism in which a first rotational element, a second rotational element, and a third rotational element are arranged in this order on an alignment chart; and
a second planetary gear mechanism in which a fourth rotational element, a fifth rotational element, and a sixth rotational element are arranged in this order on the alignment chart, wherein
the input element is connected to the first rotational element,
the output element is connected to the second rotational element and the sixth rotational element,
one side of the first engagement element is connected to the fifth rotational element,
the other side of the first engagement element is fixed,
one side of the second engagement element is connected to the third rotational element and the fourth rotational element,
the other side of the second engagement element is fixed, and
the third engagement element connects; any of
(i) the first rotational element and the second rotational element,
(ii) the second rotational element and the fifth rotational element,
(iii) the second rotational element and the third rotational element, or
(iv) the third rotational element and the fifth rotational element.
2 . The unit according to claim 1 , wherein
the third engagement element connects the input element and the output element.
3 . The unit according to claim 1 , wherein
the first engagement element is configured to be selectable between a one-way clutch state and an engaged state,
the second engagement element is implemented by a multi-plate clutch, and
the third engagement element is implemented by a multi-plate clutch.
4 . The unit according to claim 1 , wherein
the second engagement element has a portion overlapping the third engagement element when viewed in a radial direction.
5 . The unit according to claim 4 , wherein
an actuator that drives the second engagement element has a portion overlapping an actuator that drives the third engagement element when viewed in the radial direction.
6 . The unit according to claim 1 , wherein
the first engagement element has a portion overlapping the second planetary gear mechanism when viewed in a radial direction.
7 . The unit according to claim 1 , wherein
the other side of the second engagement element is fixed to a wall portion, and
the wall portion has a portion located between the first engagement element and the second engagement element.