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US 8,800,702 B2Granted
In-wheel motor drive assembly
AssigneeNtn Corporation
InventorsTetsuya Yamamoto, Akira Yamagata
Life of this patent
Estimating the term…
Abstract
An in-wheel motor drive assembly 21 includes: a motor unit A; a speed reduction unit B having an output shaft 28 reducing the rotational speed of the motor rotary shaft 35 and outputting the reduced rotation and a speed-reduction-unit casing 22b forming a contour, and disposed on one axial side of the motor unit A; a wheel hub bearing unit C having a wheel hub 32 fixedly coupled with the output shaft 28 and a wheel-hub-bearing outer ring 22c rotatably supporting the wheel hub 32, and disposed on one axial side of the speed reduction unit B; and coupling portions 63, 64 secured to at least one of the wheel-hub-bearing outer ring 22c and speed-reduction-unit casing 22b to couple with members of a vehicle body.
Claims10
An in-wheel motor drive assembly comprising:
- a motor unit including a motor rotary shaft and a motor-unit casing forming a contour of the motor unit;
- a speed reduction unit including an output shaft reducing the rotational speed of the motor rotary shaft and outputting the reduced rotation and a speed-reduction-unit casing forming a contour of the speed reduction unit, the speed reduction unit being disposed on one axial side of the motor unit;
- a wheel hub bearing unit including a wheel hub fixedly coupled with the output shaft and a wheel-hub-bearing outer ring rotatably supporting the wheel hub, the wheel hub bearing unit being disposed on one axial side of the speed reduction unit;
- a coupling member with a root end part secured to at least one of the wheel-hub-bearing outer ring and the speed-reduction-unit casing and with a tip end part projecting radially outward and having a coupling portion at a tip end region of the coupling member, wherein
- one of the wheel-hub-bearing outer ring and the speed-reduction-unit casing includes a casing projecting portion projecting toward the other, and the other engages with the casing projecting portion, and
- the coupling member is fixedly interposed between the wheel-hub-bearing outer ring and the speed-reduction-unit casing on a radially outside of the casing projecting portion.
3 more elements
An in-wheel motor drive assembly comprising:
- a motor unit including a motor rotary shaft and a motor-unit casing forming a contour of the motor unit;
- a speed reduction unit including an output shaft reducing the rotational speed of the motor rotary shaft and outputting the reduced rotation and a speed-reduction-unit casing forming a contour of the speed reduction unit, the speed reduction unit being disposed on one axial side of the motor unit;
- a wheel hub bearing unit including a wheel hub fixedly coupled with the output shaft and a wheel-hub-bearing outer ring rotatably supporting the wheel hub, the wheel hub bearing unit being disposed on one axial side of the speed reduction unit;
- a coupling member with a root end part secured to at least one of the wheel-hub-bearing outer ring and the speed-reduction-unit casing and with a tip end part projecting radially outward and having a coupling portion at a tip end region of the coupling member, wherein
- one of the wheel-hub-bearing outer ring and the speed-reduction-unit casing has a cut-away portion on an end thereof facing the other, the cut-away portion extending radially inward from an outer circumferential surface thereof, and
- the root end part of the coupling member fits in the cut-away portion.
3 more elements
An in-wheel motor drive assembly comprising:
- a motor unit including a motor rotary shaft and a motor-unit casing forming a contour of the motor unit;
- a speed reduction unit including an output shaft reducing the rotational speed of the motor rotary shaft and outputting the reduced rotation and a speed-reduction-unit casing forming a contour of the speed reduction unit, the speed reduction unit being disposed on one axial side of the motor unit;
- a wheel hub bearing unit including a wheel hub fixedly coupled with the output shaft and a wheel-hub-bearing outer ring rotatably supporting the wheel hub, the wheel hub bearing unit being disposed on one axial side of the speed reduction unit;
- a coupling member with a root end part secured to at least one of the wheel-hub-bearing outer ring and the speed-reduction-unit casing and with a tip end part projecting radially outward and having a coupling portion at a tip end region of the coupling member, wherein
- the coupling member has a through bore in the root end part, and the output shaft or an input shaft passes through the through bore.
2 more elements
An in-wheel motor drive assembly comprising:
- a motor unit including a motor rotary shaft and a motor-unit casing forming a contour of the motor unit;
- a speed reduction unit including an output shaft reducing the rotational speed of the motor rotary shaft and outputting the reduced rotation and a speed-reduction-unit casing forming a contour of the speed reduction unit, the speed reduction unit being disposed on one axial side of the motor unit;
- a wheel hub bearing unit including a wheel hub fixedly coupled with the output shaft and a wheel-hub-bearing outer ring rotatably supporting the wheel hub, the wheel hub bearing unit being disposed on one axial side of the speed reduction unit;
- a coupling member with a root end part secured to at least one of the wheel-hub-bearing outer ring and the speed-reduction-unit casing and with a tip end part projecting radially outward and having a coupling portion at a tip end region of the coupling member, wherein
- the coupling member is interposed between the wheel-hub-bearing outer ring and the speed-reduction-unit casing and the wheel-hub-bearing outer ring and coupling member are in surface contact, and
- the surface contact is made between flat faces orthogonal to the axis, each flat face includes a radially outer flat face, a radially inner flat face, and a step between the radially outer flat face and radially inner flat face to form two stairs.
3 more elements
An in-wheel motor drive assembly comprising:
- a motor unit including a motor rotary shaft and a motor-unit casing forming a contour of the motor unit;
- a speed reduction unit including an output shaft reducing the rotational speed of the motor rotary shaft and outputting the reduced rotation and a speed-reduction-unit casing forming a contour of the speed reduction unit, the speed reduction unit being disposed on one axial side of the motor unit;
- a wheel hub bearing unit including a wheel hub fixedly coupled with the output shaft and a wheel-hub-bearing outer ring rotatably supporting the wheel hub, the wheel hub bearing unit being disposed on one axial side of the speed reduction unit;
- a coupling member with a root end part secured to at least one of the wheel-hub-bearing outer ring and the speed-reduction-unit casing and with a tip end part projecting radially outward and having a coupling portion at a tip end region of the coupling member, wherein
- the coupling member includes a seat portion in the middle area between the root end part and the tip end part to attach a brake caliper.
2 more elements
Dependencies are inferred from the claim text.