Ntn Corporation

Shiro Tamura

Shinya Taikou

Minoru Suzuki

Yusuke Shibuya

Takanori Ishikawa

Tomohisa Uozumi

Naoya Takeuchi

Tetsuya Yamamoto

Aiko Ishikawa

Huaxia Li

Shogo Okamoto

Aiko Myouki

Youhei Imanishi

A casing () is divided into a cylindrical first case portion () integrally having a partition part (), a second case portion () connected to one end of the first case portion in an axial direction and configured to cover a second space (S), and a third case portion () connected to the other end of the first case portion in the axial direction and configured to cover a first space (S). A signal cable passed through a through hole () of the partition part extends from a sensor () to an external connector () provided in the second case portion or the third case portion, and is anchored to the first case portion () in the vicinity of a through hole () of the partition part.

Motor drive device for vehicles

An in-wheel motor drive device () includes a wheel hub bearing unit () having an outer ring (), an inner ring () protruding from the outer ring to one side in an axial (O) direction, rolling elements () between the outer ring and the inner ring, and a fixing bolt () for fixing the outer ring to a non-rotary member (); and a brake disk () having a connecting portion () configured to connect with one end of the inner ring, a cylindrical portion () extending from the connecting portion to the other side in the axial direction and disposed coaxially to the inner ring, and at least a part of the fixing bolt is received in an internal space of the cylindrical portion.

In-wheel motor drive device

An in-wheel motor drive device () includes: a motor portion (); a casing () housing a rotation transmission path from a motor rotation shaft of the motor portion to a rotating wheel; a suspending bracket () including an upper joining seat portion () joinable with an upper side suspension member () of a suspension device, a lower joining seat portion () joinable with a lower side suspension member () of the suspension device, and an intermediate portion () connecting the upper joining seat portion and the lower joining seat portion, and a fixing means () for mounting and fixing the suspending bracket () to an outer wall surface of the casing ().

A lubricating oil supply structure in an in-wheel motor drive device () includes an oil tank () provided a lower part of a motor unit () and/or a reducer unit (), configured to store lubricating oil, an oil pump () configured to pump up lubricating oil from the oil tank, and an oil pipe () fixedly attached in an upper part of the motor unit and/or the reducer unit. The oil pipe () includes an inlet () through which lubricating oil pumped up from the oil pump () flows therein, and at least one outlet () provided between one end thereof and the other end thereof, configured to discharge lubricating oil flown in from the inlet () downwards.

Lubricating oil supply structure

An in-wheel motor drive device includes an electric motor section, a speed reducer section, a wheel bearing section, and a casing. The speed reducer section includes a speed-reduction structure using a parallel shaft gear. The parallel shaft gear includes an input shaft, which is coupled to the electric motor section, an input gear, at least one intermediate shaft including input-side and output-side intermediate gears, an output shaft, which is coupled to the wheel bearing section, and a final output gear. The input, intermediate, and output shafts are supported by rolling bearings to be rotatable. At least two rolling bearings configured to support the intermediate and output shafts on an out-board side and two rolling bearings configured to support the intermediate and output shafts on an in-board side are arranged at positions at which respective bearing widths are prevented from being superimposed with each other in an axial direction.

An in-wheel motor drive device includes an electric motor section, a speed reducer section having a speed-reduction structure using parallel shaft gears, a wheel bearing section, and a casing. The parallel shaft gears include at least one intermediate shaft each having an input-side and output-side intermediate gears, and an output shaft having a final output gear. The at least one intermediate shaft and the output shaft each have both end portions supported by rolling bearings to be rotatable. Among the rolling bearings, at least one rolling bearing arranged close to the input-side intermediate gear or a rolling bearing arranged close to the final output gear is arranged in a radially-inner-side recess portion of the gear, which is arranged close to the corresponding rolling bearing.

In an in-wheel motor drive device, a speed reduction part is a parallel shaft gear reducer that includes a plurality of gear shafts extending in parallel to one another. One of the gear shafts is coupled with the rotation shaft of the motor part, the other one of the gear shafts is coupled with the wheel hub of the wheel hub bearing part. Remaining gear shafts decelerate the rotation of the motor part and transmit it to the wheel hub. The motor drive device includes a parking gear attached to any of the gear shafts. The parking pawl has a projection portion engaged with a recess portion of the parking gear. A movement member enables a parking pawl to move between a locking position engaged with the recess portion and an unlocking position not engaged therewith. The parking gear, the parking pawl, and movement member are housed inside a housing.

A suspension structure for an in-wheel motor drive device of the present invention includes an in-wheel motor drive device (), a shock absorber (), a torsion bar (), and a stabilizer link (), wherein: the shock absorber includes an upper spring seat () provided in an upper end region of the shock absorber and a lower spring seat () provided in a lower end region of the shock absorber and forming a pair with the upper spring seat; an upper end () of the stabilizer link is arranged between a vehicle back edge () of the lower spring seat and a vehicle front edge () of the lower spring seat; and a lower end () of the stabilizer link is arranged so as to overlap with a hub wheel () as viewed in an axial direction of the hub wheel.

Suspension structure for in-wheel motor drive device

Provided is an in-wheel motor drive device () including: a motor (); a wheel bearing (); and a speed reducer (). The speed reducer () comprises: a speed reducer input shaft (S) including an input gear (); a speed reducer output shaft (S) including an output gear (); and an intermediate shaft (S) including a small-diameter intermediate gear () and a large-diameter intermediate gear (). The large-diameter intermediate gear () has a circumscribed circle which is superimposed with a pitch circle of a plurality of rolling elements () of the wheel bearing () when viewed from an axial direction.

An in-wheel motor drive device includes: a wheel hub bearing portion having an inner ring integrally rotating with a wheel, an outer ring facing the inner ring via a radial gap, and a hub attachment arranged on a more outer diameter side than the outer ring and mounted and fixed to the outer ring; a motor portion driving the inner ring; a casing housing a rotation transmission path from a motor rotation shaft of the motor portion to the inner ring; a suspending bracket having an upper joining seat portion joinable with an upper side suspension member of a suspension device, a lower joining seat portion joinable with a lower side suspension member of the suspension device, and an intermediate portion connecting the upper joining seat portion and the lower joining seat portion; and fixing means for mounting and fixing the suspending bracket to the hub attachment.

An in-wheel motor drive device speed reducer includes an input shaft coupled to a motor rotating shaft. an output shaft coupled to a wheel hub and parallel to the input shaft, and one or more intermediate shafts parallel to the input shaft and the output shaft. An input gear coupled to the input shaft, a plurality of intermediate gears coupled to the intermediate shafts, and an output gear coupled to the output shaft mesh with each other and configure a drive transmission path leading to the output gear from the input gear through the plurality of intermediate gears. When viewed axially using the intermediate shaft, axes of the output shaft, the at least one intermediate shaft, and the input shaft are arranged in this order in the vehicle front-to-rear direction. The axis of the at least one intermediate shaft is disposed above the axes of the output and input shafts.

A speed reduction unit () includes an input shaft () coupled to a motor rotary shaft () of a motor unit (), an input gear () coupled to the input shaft, a cylindrical output shaft () coupled to an outer ring (), and an output gear () coupled to the output shaft, and constructs a driving-force transmission path that reduces the rotational speed of the input gear and transmits the reduced rotational speed to the output gear. The output shaft is rotatably supported at both ends by a first output-shaft bearing () rotatably supporting an outer diameter of an axially outer end side of the output shaft and a second output-shaft bearing () rotatably supporting an inner diameter of an axially inner end side of the output shaft.

An in-wheel motor drive device includes a wheel hub bearing unit and a speed reduction unit that decelerates rotation of a motor unit and transmits decelerated rotation to a wheel. A suspension bracket has an upper connecting seat portion connectable with a suspension device, a lower connecting seat portion connectable with the suspension device, and an intermediate area connecting a vehicle rear part of the upper connecting seat portion and a vehicle rear part of the lower connecting seat portion. A notch is provided between a vehicle front part of the upper connecting seat portion and a vehicle front part of the lower connecting seat portion on a front side of the vehicle of the intermediate area. The suspension bracket is attached/fixed to a casing of the speed reduction unit and/or a fixed wheel such that an axis of the wheel hub bearing unit passes through the notch.

A casing () of an in-wheel motor drive device () includes a tubular body first casing () disposed on one side in an axial (O) direction and a tubular body second casing () disposed on the other side in the axial direction. Each of the body first casing and the body second casing has an annular abutting surface () so that the annular abutting surfaces of the body first casing and the body second casing abut on each other in the axial direction. A hub carrier () has at its tip end a connecting portion () for rotatable connection to a vehicle body-side member (). The connecting portion is disposed so as not to overlap the abutting surfaces in the axial direction and so as to overlap the body first casing or the body second casing in the axial direction.

In-wheel motor drive device and connection structure between in-wheel motor drive device and wheel

An in-wheel motor power line () includes, between its one end and the other end, an in-wheel motor drive device-side region (), an intermediate region (), and a vehicle body-side region () which extend continuously. The in-wheel motor drive device-side region () extends in the vertical direction, and the lower side of the in-wheel motor drive device-side region is connected to the intermediate region. The vehicle body-side region extends in the vertical direction, and the lower side of the vehicle body-side region is connected to the intermediate region. The intermediate region is curved with its both sides located at a higher position and its intermediate part located at a lower position.

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Shizuoka, Japan

Shiro Tamura