WO2022270381A1 - Dispositif d'alimentation pour véhicule et palier pour roue avec générateur d'énergie - Google Patents

Dispositif d'alimentation pour véhicule et palier pour roue avec générateur d'énergie Download PDF

Info

Publication number
WO2022270381A1
WO2022270381A1 PCT/JP2022/023985 JP2022023985W WO2022270381A1 WO 2022270381 A1 WO2022270381 A1 WO 2022270381A1 JP 2022023985 W JP2022023985 W JP 2022023985W WO 2022270381 A1 WO2022270381 A1 WO 2022270381A1
Authority
WO
WIPO (PCT)
Prior art keywords
inner ring
vehicle
ring
cooling
wheel
Prior art date
Application number
PCT/JP2022/023985
Other languages
English (en)
Japanese (ja)
Inventor
雄司 矢田
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2022270381A1 publication Critical patent/WO2022270381A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/14—Torque-transmitting axles composite or split, e.g. half- axles; Couplings between axle parts or sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C37/00—Cooling of bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings

Definitions

  • the present invention relates to a vehicle power unit and a wheel bearing with a generator installed in a vehicle such as an automobile.
  • a vehicle power unit that incorporates an electric motor inside the wheel is a device that integrates the wheel bearings that support the wheels and the electric motor that drives and regenerates the wheels. It has many advantages such as stabilization of posture by control, and demand is expected in the future along with the electrification of automobiles.
  • the wheel bearing device disclosed in Patent Document 1 is small in size and can be placed on the inner diameter side of the outer circumference of the brake rotor. Easy.
  • the wheel bearing and the electric motor are closely housed in a narrow space, and moreover, compared to a normal wheel bearing that does not have an electric motor, it has many heat sources. .
  • the heat sources include the heat generated by the winding coils of the electric motor due to energization, the heat generated by the stator core accompanying the rotation of the motor, and the heat generated by the brake rotor. heat is transferred.
  • the bearing portion is filled with bearing grease for lubrication, and since this bearing grease deteriorates when the temperature exceeds the allowable temperature, there is concern that the service life of the wheel bearing may be shortened.
  • a vehicle power unit includes a cooling device for cooling wheel bearings and an electric motor (Patent Document 2).
  • this power plant for a vehicle is provided with an outer ring 50, which is a fixed ring of a wheel bearing, an electric motor 51, and a flow path 52 for circulating a coolant in peripheral members.
  • the flow path 52 is complicated, the cooling device becomes large-scaled, and the cost increases.
  • the present invention solves this problem.
  • An object of the present invention is to provide a vehicular power unit and a generator-equipped wheel bearing that can suppress the temperature rise of the bearing portion and simplify the structure.
  • a power unit for a vehicle has an inner ring that is a fixed ring and an outer ring that is a rotating ring that is rotatably supported by the inner ring via rolling elements.
  • a vehicular power unit comprising: an outer ring rotating type wheel bearing provided at an outboard side end of the outer ring; and an electric motor having a stator attached to the inner ring and a rotor attached to the outer ring,
  • a bracket interposed between the vehicle underbody frame part and the inner ring is provided, and a cooling flow path provided on a contact surface between the bracket and the underbody frame part facing each other and the inside of the inner ring are cooled. Either one or both of the inner ring cooling means are provided.
  • the bearing portion of the present invention is synonymous with the portion near the rolling elements in the inner and outer rings and the rolling elements. Therefore, even if the vehicle power unit includes an electric motor that is a heat source, the grease filled in the bearing portion does not deteriorate, and the service life of the wheel bearing can be prevented from being shortened.
  • the cooling passage is provided on the contact surface between the bracket and the undercarriage frame component, the simple structure makes it possible to reduce the cost of the vehicle power unit as compared with the above-described conventional vehicle power unit equipped with the cooling device, and reduce the cost of the vehicle power unit as a whole.
  • the size can be kept small.
  • the inner ring cooling means for cooling the inside of the inner ring When the inner ring cooling means for cooling the inside of the inner ring is provided, the inner ring cooling means can be easily installed because the inner ring is a fixed ring. In a general inner-ring rotating type wheel bearing, since the inner ring is a rotating ring, it is difficult to introduce a coolant or the like from the outside into the inner ring, which is a rotating ring. According to the present invention, even if heat is transferred to the inner ring from an electric motor or the like, the inner ring cooling means for cooling the inside of the inner ring, which is a fixed ring, suppresses the temperature rise of the inner ring to a certain level, and the bearing portion is filled with the heat. Degradation of grease can be prevented.
  • the service life of the wheel bearing can be extended.
  • the cooling portion of the inner ring cooling means can be completed only by the inner ring, it is possible to realize a compact, low-cost cooling means whose structure is simpler than that of the conventional cooling device.
  • the wheel bearing and the electric motor have a smaller diameter than the outer peripheral portion of the brake rotor against which the brake caliper is pressed, and the electric motor is connected to the wheel mounting flange and the outboard side of the suspension frame component. may be located in the axial range between According to this configuration, the wheel bearing and the electric motor are smaller in diameter than the outer peripheral portion of the brake rotor, and the electric motor is located in the axial range between the wheel mounting flange and the outboard side surface of the suspension frame component. Therefore, most of the electric motor and wheel bearings can be installed in the space surrounded by the brake rotor and the suspension frame parts, and the electric motor and wheel bearings can be compactly housed in the wheel.
  • the inner ring cooling means has a refrigerant passage for flowing a refrigerant inside the inner ring, and the refrigerant passage and the cooling passage are communicated with each other. good too.
  • the cooling performance of the bearing portion can be further improved, although the cooling structure is somewhat complicated, as compared with the vehicle power unit provided with either one of the cooling passage and the inner ring cooling means.
  • the inner ring cooling means may be a heat pipe provided on the inner ring.
  • the heat pipe is a component that seals a working fluid in a pipe, circulates the working fluid by convection caused by a temperature difference between both ends in the axial direction, and dissipates heat.
  • the heat transferred to the inner ring can be released to the outside of the vehicle power plant by the heat pipe alone, so the cooling structure is simplified without the need for a coolant from the outside and a device for circulating this coolant. be able to.
  • the inner ring cooling means may have a refrigerant passage for flowing a refrigerant inside the inner ring, and a pump for circulating the refrigerant along the refrigerant passage.
  • the bearing portion of the wheel bearing can be reliably cooled by circulating the coolant along the coolant path with the pump.
  • the inner ring cooling means may have a heat exchanger that releases heat from the inner ring to the outside in the middle of the refrigerant circulation flow path. In this case, by radiating heat from the heat exchanger to the outside, the temperature inside the inner ring as well as the bearing can be more effectively lowered.
  • the electric motor may be of direct drive type.
  • the wheels can be directly rotationally driven without intervening means for accelerating or decelerating the rotation of the electric motor. Therefore, the number of parts of the vehicle power plant can be reduced, and the structure can be simplified. As a result, the overall size of the power plant for a vehicle can be reduced.
  • a generator-equipped wheel bearing of the present invention has an inner ring as a fixed ring and an outer ring as a rotating ring rotatably supported by the inner ring via rolling elements.
  • a wheel bearing with a generator comprising: an outer ring rotating type wheel bearing having a flange at an outboard end of the outer ring; and a generator having a stator attached to the inner ring and a rotor attached to the outer ring.
  • a cooling channel provided on a contact surface between the bracket and the undercarriage frame part facing each other; and the inner race. Either one or both of the inner ring cooling means for cooling the inside of the
  • the cooling passage is provided on the contact surface between the bracket and the underbody frame component, the heat generated in the bearing portion of the wheel bearing is efficiently dissipated to the underbody frame component having a large heat capacity. . Therefore, the cooling performance of the bearing is improved. Therefore, even if the generator-equipped wheel bearing includes a generator that is a heat source, the grease filled in the bearing portion does not deteriorate, and the service life of the wheel bearing can be prevented from being shortened. Furthermore, due to the simple structure of providing a cooling channel on the contact surface between the bracket and the underbody frame part, the cost can be reduced compared to the vehicle power unit provided with the conventional cooling device, and the bearing for the wheel with a generator. The overall size can be kept small.
  • the inner ring cooling means for cooling the inside of the inner ring can be easily installed because the inner ring is a fixed ring.
  • the inner ring is a rotating ring, it is difficult to introduce a coolant or the like from the outside into the inner ring, which is a rotating ring.
  • the inner ring cooling means for cooling the inside of the inner ring which is a fixed ring, suppresses the temperature rise of the inner ring to a certain level, and the bearing portion is filled. It is possible to prevent the deterioration of the grease.
  • the service life of the wheel bearing can be extended.
  • the cooling portion of the inner ring cooling means can be completed only by the inner ring, it is possible to realize a compact, low-cost cooling means whose structure is simpler than that of the conventional cooling device.
  • FIG. 1 is a cross-sectional view of a vehicle power plant according to a first embodiment of the present invention
  • FIG. 2 is a sectional view taken along line III-III of FIG. 1
  • FIG. 6 is a cross-sectional view of a vehicle power plant according to a second embodiment of the present invention
  • FIG. 6 is a cross-sectional view of a vehicle power plant according to a third embodiment of the present invention
  • FIG. 4 is a cross-sectional view of a vehicle power plant according to a fourth embodiment of the present invention
  • FIG. 11 is a cross-sectional view of a vehicle power plant according to a fifth embodiment of the present invention
  • FIG. 7B is a sectional view taken along the line VIIB-VIIB of FIG. 7A
  • FIG. 11 is a cross-sectional view of a vehicle power plant according to a sixth embodiment of the present invention
  • FIG. 11 is a side view of the vehicle power plant according to the sixth embodiment
  • FIG. 11 is a side view of a vehicle power plant according to a modification of the sixth embodiment
  • FIG. 11 is a cross-sectional view of a vehicle power plant according to a seventh embodiment of the present invention.
  • FIG. 11 is a side view of the vehicle power plant according to the seventh embodiment;
  • 11 is a cross-sectional view taken along line XII-XII of FIG. 10;
  • FIG. 1 is a cross-sectional view of a conventional power plant for a vehicle;
  • FIG. 1 is a sectional view taken along line II of FIG.
  • the vehicle power unit 1 includes a wheel bearing 2, a bracket 24, and a running motor 3 with a power generation function, which is an electric motor that also serves as a generator.
  • This vehicle power unit 1 has an inner rotor type running motor 3 with a power generating function.
  • the generator-equipped wheel bearing is provided with the generator and the wheel bearing 2 .
  • the wheel bearing 2 holds an inner ring 5 which is a fixed ring, an outer ring 4 which is a rotating ring rotatably supported by the inner ring 5 via double rows of rolling elements 6, and the rolling elements 6 of each row. It is an outer ring rotating type having a retainer (not shown) that Bearing portions Bg in the vicinity of the rolling elements of the inner and outer rings 5 and 4 and the rolling elements 6 are filled with grease.
  • the outer ring 4 has an outer ring main body 4a on which a double-row raceway surface is formed, and a wheel mounting flange 7 provided at the end of the outer ring 4 on the outboard side.
  • the wheel mounting flange 7 extends radially outward from the outer peripheral surface of the outer ring main body 4a on the outboard side.
  • a plurality of hub bolts 13 are inserted through the wheel mounting flange 7 .
  • the brake rotor 12 and the wheel of the wheel W are attached to the wheel attachment flange 7 by the hub bolts 13 in a state in which they overlap in the axial direction.
  • a tire (not shown) is attached to the outer circumference of the wheel.
  • a threaded hole may be formed in the flange surface of the outer ring 4 instead of the hub bolt 13, and the outer ring 4, the brake rotor 12, and the wheel and tire may be fixed from the outside with wheel bolts (not shown).
  • the outboard side the side that is closer to the outside in the vehicle width direction of the vehicle
  • the inboard side the side that is closer to the center of the vehicle in the vehicle width direction
  • the board side the side that is closer to the center of the vehicle in the vehicle width direction.
  • the inner ring 5 has an inner ring main body 5a and a partial inner ring 5b fitted to the outer peripheral surface of the inner ring main body 5a on the inboard side.
  • An inner ring main body 5a which is an inner ring shaft, has an inboard side protruding portion 5i that protrudes toward the inboard side.
  • the inboard-side projecting portion 5i is provided coaxially with the inner ring main body 5a and integrally with the inner ring main body 5a, and protrudes toward the inboard side from the position where the partial inner ring 5b is disposed.
  • the above-mentioned "provided integrally” means that the inboard side projecting portion 5i and the inner ring main body 5a are not formed by combining a plurality of elements, but are made of a single material by, for example, forging, machining, or the like. or molded as a whole.
  • the inboard-side projecting portion 5i includes a fitting portion 9 and a male screw portion 11 in order from the outboard side toward the inboard side.
  • the fitting portion 9 is a fitting portion for a bracket 24, which will be described later, and is connected to the outer peripheral surface of the inner ring main body 5a on the inboard side via a step.
  • the fitting portion 9 includes a first fitting portion 9a formed with a slightly smaller diameter than the outer peripheral surface on the inboard side, and a second fitting portion 9a located on the out-inboard side of the first fitting portion 9a. and a portion 9b.
  • the second fitting portion 9b is formed with a spline Sm that is fitted to a portion of the bracket base portion 24a of the bracket 24 (the fitted portion 21).
  • the spline Sm is composed of a plurality of spline teeth formed at regular intervals in the circumferential direction, and is preferably an involute spline from the viewpoint of suppressing vibration.
  • the outer peripheral surface of the second fitting portion 9b, ie, the outer diameter surface of the spline Sm, is smaller in diameter than the first fitting portion 9a and larger in diameter than the male screw portion 11. As shown in FIG.
  • the bracket 24 includes a bracket base portion 24a fixed to the knuckle 8, which is a vehicle underbody frame component, and a bracket cylindrical portion 24b extending from the outer diameter side end of a large diameter portion (described later) of the bracket base portion 24a toward the outboard side. and
  • the bracket base portion 24a and the bracket cylindrical portion 24b are coaxially and integrally formed.
  • the bracket base portion 24a and the bracket cylindrical portion 24b may be configured from separate members and fixed.
  • the bracket base portion 24a is interposed between the knuckle 8 and the inner ring 5, and the inner ring 5 is detachably fixed thereto.
  • the bracket base portion 24a has a large-diameter portion 24aa on the outboard side and a small-diameter portion 24ab connected to the inboard side surface of the large-diameter portion 24aa and having a smaller diameter than the large-diameter portion 24aa.
  • the large-diameter portion 24aa is formed with a fitted portion 20 to be fitted with the first fitting portion 9a, and the small-diameter portion 24ab is formed with a spline groove that is fitted with the spline Sm, which is an involute spline.
  • a fitting portion 21 is formed.
  • the fitting between the first fitting portion 9a and the fitted portion 20 may be a clearance fit, but may be a press fit to further improve the accuracy of the axial center.
  • the knuckle 8 is formed with a through hole 8b that allows the small diameter portion 24ab to be fitted therein.
  • a plurality of screw holes are formed in the large diameter portion 24aa in the circumferential direction, and the bracket base portion 24a is attached to the knuckle 8 with a plurality of bolts 22 screwed into these screw holes.
  • the bracket base 24a is engaged with the knuckle 8 in a state in which the outer peripheral surface of the small diameter portion 24ab is fitted in the through hole 8b of the knuckle 8 and in a state in which the inboard side surface of the large diameter portion 24aa is in contact with the outboard side surface 8a of the knuckle 8. Fixed to 8.
  • the inboard side surface of the partial inner ring 5b is arranged to contact the outboard side surface of the large diameter portion 24aa.
  • the bracket base portion 24a is formed with an insertion hole through which the inboard-side projecting portion 5i is inserted.
  • the insertion hole is formed by the fitted portions 20 and 21 .
  • the first fitting portion 9a of the inboard-side projecting portion 5i and the fitted portion 20 of the large-diameter portion 24aa are fitted together, and the second fitting portion 9b of the inboard-side projecting portion 5i and the small-diameter portion 24ab are fitted together. is spline-fitted.
  • the wheel bearing 2 is fixed to the bracket 24 with a torque value that generates a predetermined axial force in the bearing portion Bg.
  • the second fitting portion 9b of the inner ring main body 5a and the fitted portion 21 of the bracket 24 are spline-fitted to each other, so that rotation of the inner ring 5 and vibration in the rotational direction can be suppressed.
  • the brake 17 is a friction brake comprising a disc-shaped brake rotor 12 and a brake caliper 16 .
  • the brake rotor 12 has a flat portion 12a and an outer peripheral portion 12b.
  • the flat plate-like portion 12 a is an annular flat plate-like member that overlaps the wheel mounting flange 7 .
  • the outer peripheral portion 12b includes a cylindrical portion 12ba that extends cylindrically toward the inboard side from the outer peripheral edge portion of the flat plate portion 12a, and a flat plate portion 12bb that extends in a flat plate shape from the inboard side end of the cylindrical portion 12ba toward the outer diameter side.
  • the flat plate portion 12bb is a portion against which the brake caliper 16 is pressed.
  • the brake caliper 16 may be hydraulic or mechanical, or may be of the electric motor type.
  • the power-generating running motor 3 of this example is equipped with a power-generating function for assisting running, which generates power with the rotation of the wheels W, and can drive the wheels W to rotate by being supplied with power. It is a running motor.
  • the running motor 3 with power generation function is an inner rotor type having a stator 18 attached to the inner circumference of the bracket cylindrical portion 24b and a rotor 19 attached to the outer circumference of the outer ring main body 4a on the inner circumference of the stator 18.
  • the running motor 3 with power generating function is of a direct drive type in which the rotor 19 is directly attached to the outer ring 4 .
  • the traveling motor 3 with power generating function and the wheel bearing 2 have a smaller diameter than the outer peripheral portion 12 b of the brake rotor 12 , and the traveling motor 3 with power generating function is attached to the wheel mounting flange 7 and the outboard side of the knuckle 8 . 8a in the axial direction range L1.
  • the running motor 3 with power generation function is, for example, a surface magnet type permanent magnet motor, that is, an SPM (Surface Permanent Magnet) synchronous motor (or SPMSM (Surface Permanent Magnet Synchronous Motor)).
  • the running motor 3 with power generation function may be an IPM (Interior Permanent Magnet) synchronous motor (or IPMSM (Interior Permanent Magnet Synchronous Motor)).
  • IPM Interior Permanent Magnet
  • IPMSM Interior Permanent Magnet Synchronous Motor
  • various forms such as a switched reluctance motor (abbreviated as SR motor), an induction motor (abbreviated as IM), etc. can be used as the running motor 3 with power generation function.
  • SR motor switched reluctance motor
  • IM induction motor
  • each type of distributed winding and concentrated winding can be adopted as the winding type of the stator 18 .
  • the stator 18 has an annular stator core 18a and a stator coil 18b wound around teeth of the stator core 18a via an insulating material (not shown). A resin bobbin or the like is applied as the insulating material.
  • the stator core 18a is made of, for example, an electromagnetic steel sheet, a dust core, an amorphous alloy, or the like.
  • the stator core 18 a is fitted to the inner peripheral surface of the bracket cylindrical portion 24 b of the bracket 24 .
  • the stator core 18a is fixed to the inner peripheral surface of the bracket cylindrical portion 24b by press-fitting, adhesion, restraint by another member, or the like.
  • a plurality of recesses or protrusions are formed on the outer peripheral surface of the stator core 18a at regular intervals in the circumferential direction, and the inner peripheral surface of the bracket cylindrical portion 24b is fitted into the plurality of recesses or protrusions.
  • a plurality of nesting protrusions or depressions may be formed. Thereby, the stator core 18 can be suppressed from moving in the rotational direction.
  • the rotor 19 is an inner rotor type provided so as to face the stator core 18a radially inward.
  • the rotor 19 has a cylindrical rotor core 19a fixed to the outer circumference of the outer ring main body 4a, and permanent magnets 19b fixed to the outer circumference of the rotor core 19a.
  • the rotor core 19a is made of, for example, a soft magnetic material, and is concentrically fixed to the outer ring main body 4a by, for example, press fitting, welding, or adhesion.
  • a plurality of recessed portions are formed on the outer peripheral surface of the rotor core 19a at regular intervals in the circumferential direction, and the permanent magnets 19b are fitted into the respective recessed portions and fixed by adhesion or the like.
  • This vehicle power plant 1 includes inner ring cooling means 26 for cooling the inside of the inner ring 5 .
  • the inner ring cooling means 26 has a refrigerant passage 27 provided inside the inner ring main body 5a for flowing the refrigerant, a pump P as a circulation force generating means, and a circulation passage 28 for circulating the refrigerant by the pump P.
  • a refrigerant passage 27 is provided inside the inner ring main body 5a for flowing a refrigerant such as water, oil, air, or the like.
  • the coolant passage 27 has first and second passages 27a and 27b, which are formed parallel to the axis of the inner ring main body 5a.
  • the first and second flow passages 27a and 27b are formed of through holes penetrating from the outboard side end of the inner ring main body 5a to the inboard side end thereof, respectively, and are provided at axially symmetrical positions 180 degrees out of phase with respect to the axial center. It is
  • a coolant inlet is formed at the inboard side end of the first flow path 27a, and a coolant outlet is formed at the inboard side end of the second flow path 27b.
  • Connected to the outboard end of the first flow path 27a is the outboard end of the second flow path 27b via a coupling 30, a U-shaped hose or tube 31, and a coupling 32, in turn.
  • the pump P is installed, for example, on the vehicle body.
  • the discharge port Pa of the pump P and the inboard side end of the first flow path 27a are connected by a discharge path 33, and the suction port Pb of the pump P and the inboard side end of the second flow path 27b are connected by a suction path 34.
  • the discharge passage 33 , the suction passage 34 , the joints 30 and 32 and the hose or pipe 31 constitute the circulation passage 28 .
  • the refrigerant is circulated along the first and second flow paths 27a and 27b and the circulation flow path 28.
  • FIG. Thereby, the bearing portion Bg of the wheel bearing 2 can be reliably cooled.
  • the wheel speed sensor Sa is a sensor that detects the rotational speed of the wheel W.
  • the magnetic encoder ring ER is installed at the inboard side end of the outer ring 4, and the magnetic encoder ring ER is provided with a predetermined gap therebetween. and a sensor portion (not shown) installed on the outer peripheral surface of the inner ring 5b.
  • the vehicle power plant 1 may be provided with a rotation detection sensor that controls the rotation of the running motor 3 with a power generation function.
  • the rotation detection sensor detects the rotation angle or rotation speed of the outer ring 4 with respect to the inner ring 5 .
  • This rotational speed is synonymous with the number of revolutions per unit time.
  • a resolver for example, is applied as this rotation detection sensor, but it is not limited to the resolver, and for example, an encoder, a pulser ring, a hall sensor, or the like can be adopted regardless of the type.
  • the wheel speed sensor Sa may be provided independently of the rotation detection sensor, or the rotation detection sensor may also function as the wheel speed sensor.
  • the wheel bearings 2 and the power-generating running motor 3 are smaller in diameter than the outer peripheral portion 12b of the brake rotor 12, and the power-generating running motor 3 is mounted on the wheel mounting flange. 7 and the outboard side 8a of the knuckle 8 in the axial range L1. Therefore, most of the power-generating running motor 3 and the wheel bearing 2 can be installed in the space surrounded by the brake rotor 12 and the knuckle 8, and the power-generating running motor 3 and the wheel can be installed in the wheel W.
  • the bearing 2 can be stored compactly.
  • the inner ring cooling means 26 for cooling the inside of the inner ring 5 can be easily installed because the inner ring 5 is a fixed ring.
  • the inner ring cooling means 26 for cooling the inside of the inner ring 5, which is a fixed ring transfers heat from the running motor 3 with power generation function to the inner ring 5. It is possible to suppress the temperature rise of the inner ring 5 to a certain level and prevent deterioration of the grease filled in the bearing portion Bg.
  • the life of the wheel bearing 2 can be extended. Further, since the cooling portion of the inner ring cooling means 26 can be completed only by the inner ring 5, the structure can be simplified, and a compact and low-cost cooling means can be realized as compared with the conventional cooling device.
  • the running motor 3 with power generation function is of the direct drive type
  • the wheels W can be directly rotationally driven without intervening means for accelerating or decelerating the rotation of the running motor 3 with power generation function. Therefore, the number of parts of the vehicle power plant 1 can be reduced, and the structure can be simplified. As a result, the overall size of the power plant for a vehicle can be reduced.
  • the inner ring cooling means 26 may be a cooling pipe 35 for cooling that is inserted into a through-hole penetrating the inner ring body 5a instead of the refrigerant passage, joint, hose or pipe described above.
  • the cooling pipe 35 for example, a stainless steel pipe or the like that is bent at the middle in the longitudinal direction can be applied. The outboard side ends of the first and second flow paths 27a and 27b are communicated with each other by the bent portion 35a. Other configurations are the same as those of the first embodiment.
  • the cooling pipe 35 can be prevented from rusting. Also, since joints and hoses or pipes can be reduced, the number of parts can be reduced and the cooling structure can be simplified.
  • the cooling pipe 35 is not limited to a stainless steel pipe, and may be made of iron or resin.
  • the inner ring cooling means 26 may be a heat pipe Hp provided in the inner ring main body 5a. Most of the heat pipe Hp is inserted inside the inner ring main body 5a along the axial direction of the inner ring main body 5a. The external member 36 at the inboard side end of the heat pipe Hp protrudes further toward the vehicle body than the inboard side surface of the knuckle 8 . In this case, since the heat transferred to the inner ring 5 can be released to the outer member 36 by the heat pipe alone, the cooling structure can be simplified without requiring a coolant from the outside and a device for circulating the coolant. can.
  • the inner ring cooling means 26 may have a heat exchanger 37 in the middle of the refrigerant circulation flow path 28 for releasing heat from the inner ring 5 to the outside.
  • a heat exchanger 37 is interposed in the middle of a suction path 34 that connects the suction port Pb of the pump P and the inboard side end of the second flow path 27b in the circulation flow path 28 .
  • the bent portion 35a communicating the outboard side ends of the first and second flow paths 27a and 27b is projected from the outboard side end of the inner ring main body 5a as in the first and second embodiments.
  • the inner ring cooling means 26 may include a third flow path 38 for cooling the outboard side end surface of the inner ring main body 5a.
  • the third flow path 38 is a communication path that communicates the outboard side end of the first flow path 27a and the outboard side end of the second flow path 27b, and is the outboard side end surface of the inner ring main body 5a. The whole can be cooled evenly.
  • the shape of the third flow path 38 is not limited to the shape shown in FIG. 7B, and various shapes are possible. According to this embodiment, not only the inside of the inner ring main body 5a but also the inner ring end surface can be cooled, so the cooling performance of the bearing portion Bg is further improved.
  • a cooling channel 39 may be provided on the contact surface between the inboard side surface of the bracket base 24a and the outboard side surface 8a of the knuckle 8, which face each other.
  • the cooling channel 39 in this example has a substantially annular shape and is arranged radially outward from the position where the bolt 22 is arranged.
  • One end 39 a and the other end 39 b of the cooling channel 39 are connected to a pump P, and the pump P is driven to circulate the coolant along the cooling channel 39 .
  • the refrigerant passage 27 of the inner ring cooling means 26 and the cooling passage 39 may communicate in series. Also in this case, the cooling performance of the bearing portion can be further improved.
  • the power-generating running motor 3 includes a stator 18 fitted to the outer peripheral surface of the bracket cylindrical portion 24b, and a rotor case positioned on the outer periphery of the stator 18 and attached to the wheel mounting flange 7. It may be of the outer rotor type with the rotor 19 attached via 40 .
  • the electric motor may be a main drive source for running, not for assisting running.
  • the generator-equipped wheel bearing 1 ⁇ /b>A may include a generator that does not function as an electric motor and the wheel bearing 2 .
  • a vehicle system in which the generator-equipped wheel bearing 1A is mounted has a function of generating power, but is configured not to rotate by power supply.
  • This generator-equipped wheel bearing 1A has the same configuration as the vehicle power unit 1 of each embodiment except for the electric motor.
  • a second-generation structure of an outer ring rotating type having an outer ring that is a rotating ring having a hub flange and an inner ring that is a fixed ring may be used.
  • the underbody frame component may be a suspension knuckle that supports the steered wheels, or may be a wheel bearing installation portion of the suspension that supports the non-steered wheels.
  • SYMBOLS 1 Vehicle power unit 1A... Wheel bearing with generator 2... Wheel bearing 3... Traveling motor with power generation function (electric motor, generator) 4... Outer ring 5... Inner ring 6... Rolling element 7... Wheel mounting flange 8... Knuckle (undercarriage frame part) DESCRIPTION OF SYMBOLS 12... Brake rotor 12b... Outer peripheral part 16... Brake caliper 18... Stator 19... Rotor 24... Bracket 26... Inner ring cooling means 27... Refrigerant path 37... Heat exchanger 39... Cooling path Hp... Heat pipe P... Pump W... Wheel

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

La présente invention concerne un dispositif d'alimentation pour véhicule (1) comprenant : un palier pour roue (2) du type rotation de bague extérieure ; et un moteur pour déplacement (3) avec une fonction de génération d'énergie comprenant un stator (18) monté sur une bague intérieure (5) et un rotor (19) monté sur une bague extérieure (4). Le palier pour roue (2) et le moteur pour déplacement (3) avec la fonction de génération d'énergie présentent un diamètre inférieur à la périphérie extérieure d'un rotor de frein et le moteur pour déplacement (3) avec une fonction de génération d'énergie est positionné dans une plage axiale entre une bride de montage de roue (7) et une surface latérale extérieure (8a) d'un joint d'articulation (8). Un support (24) intercalé entre le joint d'articulation (8) et la bague intérieure (5) est prévu. Un canal de refroidissement (39) et un moyen de refroidissement de bague intérieure (26) sont prévus, le canal de refroidissement (39) étant disposé sur la surface de contact entre le support (24) et le joint d'articulation (8) opposés l'un à l'autre, et le moyen de refroidissement de bague intérieure (26) refroidissant l'intérieur de la bague intérieure (5).
PCT/JP2022/023985 2021-06-22 2022-06-15 Dispositif d'alimentation pour véhicule et palier pour roue avec générateur d'énergie WO2022270381A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-103272 2021-06-22
JP2021103272A JP2023002194A (ja) 2021-06-22 2021-06-22 車両用動力装置および発電機付き車輪用軸受

Publications (1)

Publication Number Publication Date
WO2022270381A1 true WO2022270381A1 (fr) 2022-12-29

Family

ID=84544850

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/023985 WO2022270381A1 (fr) 2021-06-22 2022-06-15 Dispositif d'alimentation pour véhicule et palier pour roue avec générateur d'énergie

Country Status (2)

Country Link
JP (1) JP2023002194A (fr)
WO (1) WO2022270381A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007269129A (ja) * 2006-03-31 2007-10-18 Honda Motor Co Ltd インホイールモータ車のホイール回転装置
KR101323777B1 (ko) * 2012-05-31 2013-10-29 김용환 중공의 축을 구비하는 전기자동차용 모터
KR20140044701A (ko) * 2012-10-05 2014-04-15 현대모비스 주식회사 인휠 구동장치
JP2018052482A (ja) 2016-09-21 2018-04-05 Ntn株式会社 補助動力装置付き車輪用軸受装置およびその補助動力装置
CN108482105A (zh) * 2018-05-22 2018-09-04 刘昱含 电动发电一体式外转子轮毂装置及电动车
JP2019119360A (ja) 2018-01-09 2019-07-22 Ntn株式会社 車輪用軸受装置およびこの車輪用軸受装置を備えた車両
CN111262360A (zh) * 2020-01-21 2020-06-09 同济大学 一种迷宫动密封外转子轮毂电机驱动装置
JP2020129893A (ja) * 2019-02-08 2020-08-27 Ntn株式会社 電動機およびこの電動機を備えた車両用動力装置、発電機およびこの発電機を備えた発電機付車輪用軸受

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007269129A (ja) * 2006-03-31 2007-10-18 Honda Motor Co Ltd インホイールモータ車のホイール回転装置
KR101323777B1 (ko) * 2012-05-31 2013-10-29 김용환 중공의 축을 구비하는 전기자동차용 모터
KR20140044701A (ko) * 2012-10-05 2014-04-15 현대모비스 주식회사 인휠 구동장치
JP2018052482A (ja) 2016-09-21 2018-04-05 Ntn株式会社 補助動力装置付き車輪用軸受装置およびその補助動力装置
JP2019119360A (ja) 2018-01-09 2019-07-22 Ntn株式会社 車輪用軸受装置およびこの車輪用軸受装置を備えた車両
CN108482105A (zh) * 2018-05-22 2018-09-04 刘昱含 电动发电一体式外转子轮毂装置及电动车
JP2020129893A (ja) * 2019-02-08 2020-08-27 Ntn株式会社 電動機およびこの電動機を備えた車両用動力装置、発電機およびこの発電機を備えた発電機付車輪用軸受
CN111262360A (zh) * 2020-01-21 2020-06-09 同济大学 一种迷宫动密封外转子轮毂电机驱动装置

Also Published As

Publication number Publication date
JP2023002194A (ja) 2023-01-10

Similar Documents

Publication Publication Date Title
JP4450208B2 (ja) インホイールモータ
US9729026B2 (en) In-wheel motor and in-wheel motor driving device
JP6194750B2 (ja) 車両用制動兼駆動装置
US20080067882A1 (en) Motor
JP6508148B2 (ja) インホイールモータユニット
US20150158381A1 (en) In-wheel assembly and vehicle with the in-wheel assembly
US10279675B2 (en) In-wheel motor drive device
WO2014069280A1 (fr) Dispositif de commande de moteur-roue
US20160214474A1 (en) In-wheel motor drive device
JP7236816B2 (ja) 車両用動力装置および発電機付き車輪用軸受装置
WO2011108479A1 (fr) Dispositif d'actionnement de moteur dans roue et procédé de conception
WO2019138965A1 (fr) Appareil de roulement de roue et véhicule doté d'un appareil de roulement de roue
JP2012508671A (ja) 電動モータホイール構造体
JP2018114834A (ja) インホイールモータ駆動装置
JP2007182194A (ja) インホイールモータ
WO2022270381A1 (fr) Dispositif d'alimentation pour véhicule et palier pour roue avec générateur d'énergie
WO2021251300A1 (fr) Dispositif d'alimentation de véhicule et palier de véhicule à générateur d'énergie
WO2022264877A1 (fr) Dispositif d'alimentation de véhicule et dispositif de palier de roue de véhicule avec générateur d'énergie
JP6800670B2 (ja) インホイールモータ駆動装置
JPH02119550A (ja) 冷却装置を備えた電動機
WO2022137862A1 (fr) L'invention concerne un dispositif à semi-conducteurs comprenant: une couche semi-conductrice ayant une surface principale; une première région de puits de type conductrice formée sur une partie couche de surface de la surface principale de la couche semi-conductrice; une première région d'impuretés de type conductrice formée sur une partie couche de surface de la région de puits et ayant une partie de paroi interne; et une seconde région d'impuretés annulaire de type conductrice formée sur la partie couche de surface de la région de puits à l'intérieur de la partie de paroi interne de façon à former une jonction pn avec la région de puits.
JP7373545B2 (ja) インホイールモーター
WO2023032486A1 (fr) Moteur-roue
WO2021095674A1 (fr) Dispositif d'entraînement de moteur-roue
JP2006117124A (ja) 車輪構造

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22828298

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2022828298

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2022828298

Country of ref document: EP

Effective date: 20240122

122 Ep: pct application non-entry in european phase

Ref document number: 22828298

Country of ref document: EP

Kind code of ref document: A1