To reduce the size of a driving unit.SOLUTION: A driving unit (20) includes a speed reducer (24), which is rotatably supported by a housing (21) and has a first transmission gear (241), a second transmission gear (242) with a lesser number of teeth than the first transmission gear (241), and a transmission shaft (243) transmitting rotation of the first transmission gear (241) to the second transmission gear (242), and a bearing (44R) rotatably supporting the first transmission gear (241) inside the housing (21). A distance (d1) between a reference plane (447), which passes through an outermost part (445) of the bearing (44R) in a first direction (448) in which the transmission shaft (243) inside the housing (21) extends and is perpendicular to the first direction (448), and a tooth (2413) of the first transmission gear (241) is shorter than a distance (h) between the reference plane (447) and an innermost part (446) of the bearing (44R) in the first direction (448).SELECTED DRAWING: Figure 4
【課題】駆動ユニットを小型化する。【解決手段】本発明のある実施形態に係る駆動ユニット(20)は、ハウジング(21)によって回転可能に支持され、第1伝達歯車(241)、第1伝達歯車(241)よりも歯数が少ない第2伝達歯車(242)、および第1伝達歯車(241)の回転を第2伝達歯車(242)に伝える伝達軸(243)を備える減速機(24)と、ハウジング(21)の内部において第1伝達歯車(241)を回転可能に支持するベアリング(44R)とを備える。ハウジング(21)内の伝達軸(243)が延びる第1方向(448)におけるベアリング(44R)の最外部(445)を通り且つ第1方向(448)に垂直な基準平面(447)から第1伝達歯車(241)の歯(2413)までの距離(d1)は、基準平面(447)から第1方向(448)におけるベアリング(44R)の最内部(446)までの距離(h)よりも短い。【選択図】図4
DRIVING UNIT AND POWER-ASSISTED VEHICLE
駆動ユニットおよび電動補助車両
2021-11-11
Patent
Electronic Resource
Japanese
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