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EP-4741190-A1 - DRIVE UNIT

EP4741190A1EP 4741190 A1EP4741190 A1EP 4741190A1EP-4741190-A1

Abstract

A drive unit to be mounted on a vehicle according to an aspect of the present invention, the drive unit including: a high-voltage unit electrically connected to a battery; a motor configured to allow electric power from the high-voltage unit to be supplied via an inverter; and a gear box provided on a shaft of the motor and configured to accommodate a shaft gear having a diameter smaller than an outer diameter dimension of the motor, the high-voltage unit, the motor, and the gear box being unitized. In this drive unit, at least a part of components of the inverter is accommodated in an accommodating chamber formed as a space different from a gear chamber accommodating the shaft gear due to a dimensional difference between the outer diameter dimension of the motor and an outer diameter dimension of the shaft gear, and in a vehicle mounted state, the motor is disposed on one side in a vehicle width direction of the gear box, and the high-voltage unit is disposed on the other side in the vehicle width direction of the gear box.

Inventors

  • SATO, SEIICHI
  • FUKUHARA, YUSUKE
  • ASAKURA, DAISUKE

Assignees

  • Nissan Motor Co., Ltd.

Dates

Publication Date
20260513
Application Date
20230707

Claims (7)

  1. A drive unit to be mounted on a vehicle, the drive unit comprising: a high-voltage unit electrically connected to a battery; a motor configured to allow electric power from the high-voltage unit to be supplied via an inverter; and a gear box provided on a shaft of the motor and configured to accommodate a shaft gear having a diameter smaller than an outer diameter dimension of the motor, the high-voltage unit, the motor, and the gear box being unitized, wherein at least a part of components of the inverter is accommodated in an accommodating chamber formed as a space different from a gear chamber accommodating the shaft gear due to a dimensional difference between the outer diameter dimension of the motor and an outer diameter dimension of the shaft gear, and in a vehicle mounted state, the motor is disposed on one side in a vehicle width direction of the gear box, and the high-voltage unit is disposed on the other side in the vehicle width direction of the gear box.
  2. The drive unit according to claim 1, wherein a gear box housing of the gear box has a shape in which at least one wall surface thereof disposed on a vehicle front-rear direction side in the vehicle mounted state does not protrude beyond a wall surface of a motor housing accommodating the motor and a wall surface of a high-voltage unit housing of the high-voltage unit.
  3. The drive unit according to claim 2, wherein the wall surface of the gear box housing disposed on at least one side on the vehicle front-rear direction side in the vehicle mounted state is disposed at a position retracted to inside of the gear box housing from the wall surface of the motor housing and the wall surface of the high-voltage unit housing.
  4. The drive unit according to claim 2, wherein in the vehicle mounted state, a top surface of the gear box housing has a lower level part located below a top surface of the motor housing and a top surface of the high-voltage unit housing, and a connector of a wire harness connected to the high-voltage unit is disposed in a space formed between the motor housing and the high-voltage unit housing by the lower level part.
  5. The drive unit according to claim 4, wherein a parking lock actuator capable of restraining rotation of a gear mechanism including the shaft gear is disposed at the lower level part on a lateral side of the connector.
  6. The drive unit according to claim 1, wherein the gear box includes a differential gear, and a differential gear accommodating part of a gear box housing, in which the differential gear is disposed, protrudes to one side on a vehicle front-rear direction side with respect to a high-voltage unit housing of the high-voltage unit in the vehicle mounted state, and a connector of a wire harness connected to the high-voltage unit is disposed on a lateral side of the differential gear accommodating part in a state of protruding in a protruding direction of the differential gear accommodating part.
  7. The drive unit according to claim 1, wherein the gear box includes a meshing gear that meshes with the shaft gear and an interlocking gear that interlocks with the meshing gear, and a rotational axis of the meshing gear is shifted to one side with a virtual straight line as a boundary, the virtual straight line connecting a rotational axis of the shaft gear and a rotational axis of the interlocking gear, and a recess being formed by a peripheral edge of the gear box housing retracted inward is provided in a gear box housing of the gear box at a portion on a side opposite to the meshing gear with the virtual straight line as a boundary, and a connector of a wire harness connected to the high-voltage unit is disposed in the recess.

Description

TECHNICAL FIELD The present invention relates to a drive unit. BACKGROUND ART JP2005-262894A discloses a vehicle using a drive source as a motor. An inverter and a motor to which a drive signal is supplied from the inverter are provided in an engine room at a vehicle front part of the vehicle. Output from the motor is transmitted to drive wheels via a gear mechanism. SUMMARY OF INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION In this vehicle, since the inverter and the motor are arranged at positions separated from each other, there is a problem that an arrangement space is required. The present invention has been made in view of such a problem, and an object of the present invention is to provide a drive unit capable of reducing an arrangement space. MEANS FOR SOLVING THE PROBLEM A drive unit to be mounted on a vehicle according to an aspect of the present invention, the drive unit including: a high-voltage unit electrically connected to a battery; a motor configured to allow electric power from the high-voltage unit to be supplied via an inverter; and a gear box provided on a shaft of the motor and configured to accommodate a shaft gear having a diameter smaller than an outer diameter dimension of the motor, the high-voltage unit, the motor, and the gear box being unitized. In this drive unit, at least a part of components of the inverter is accommodated in an accommodating chamber formed as a space different from a gear chamber accommodating the shaft gear due to a dimensional difference between the outer diameter dimension of the motor and an outer diameter dimension of the shaft gear, and in a vehicle mounted state, the motor is disposed on one side in a vehicle width direction of the gear box, and the high-voltage unit is disposed on the other side in the vehicle width direction of the gear box. In the drive unit, the accommodating chamber is formed in the gear box as a space different from the gear chamber due to a dimensional difference between the outer diameter dimension of the motor and the outer diameter dimension of the shaft gear. Further, at least a part of the components of the inverter are accommodated in the accommodating chamber. Therefore, the arrangement space may be reduced in the drive unit as compared with a case where all the components of the inverter are arranged outside the gear box. Further, the motor that sends a driving force to the gear box is disposed on one side in the vehicle width direction of the gear box, and the high-voltage unit that supplies electric power to the inverter is disposed on the other side in the vehicle width direction of the gear box in which the components of the inverter are accommodated. Accordingly, the motor, the gear box, and the high-voltage unit can be unitized by being arranged side by side without complicating mechanical connection and electrical connection, and thus the arrangement space may be further reduced. BRIEF DESCRIPTION OF DRAWINGS [FIG. 1] FIG. 1 is a perspective view illustrating a drive unit according to the present embodiment.[FIG. 2] FIG. 2 is a plan view illustrating the drive unit according to the present embodiment.[FIG. 3] FIG. 3 is a perspective view illustrating the drive unit according to the present embodiment, and illustrates a state in which a part of a gear box is opened.[FIG. 4] FIG. 4 is a sectional view of a main part of the drive unit according to the present embodiment, illustrating a state in which a motor housing is cut.[FIG. 5] FIG. 5 is a schematic diagram used for describing the drive unit according to the present embodiment.[FIG. 6] FIG. 6 is a perspective view illustrating a drive unit according to a first modification of the present embodiment.[FIG. 7] FIG. 7 is a perspective view illustrating a drive unit according to a second modification of the present embodiment, illustrating a state where a high-voltage unit is removed.[FIG. 8] FIG. 8 is a schematic diagram used for describing the drive unit according to the second modification of the present embodiment. DESCRIPTION OF EMBODIMENTS <Embodiment> Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view illustrating a drive unit 10 according to the present embodiment. FIG. 2 is a plan view illustrating the drive unit 10 according to the present embodiment. FIG. 3 is a perspective view illustrating the drive unit 10 according to the present embodiment, and FIG. 3 illustrates a state in which a part of a gear box 12 is opened. FIG. 4 is a sectional view of a main part of the drive unit 10 according to the present embodiment, illustrating a state in which a motor housing 14 is cut. FIG. 5 is a schematic diagram illustrating the drive unit 10 according to the present embodiment. As illustrated in FIGS. 1 to 3, the drive unit 10 is used in, for example, an electric vehicle. The drive unit 10 is mounted on a vehicle and drives drive wheels provided in the vehicle. The drive unit 10 is di