WO2015008702A1 - In-wheel motor driving device - Google Patents

In-wheel motor driving device Download PDF

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Publication number
WO2015008702A1
WO2015008702A1 PCT/JP2014/068536 JP2014068536W WO2015008702A1 WO 2015008702 A1 WO2015008702 A1 WO 2015008702A1 JP 2014068536 W JP2014068536 W JP 2014068536W WO 2015008702 A1 WO2015008702 A1 WO 2015008702A1
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WO
WIPO (PCT)
Prior art keywords
outer pin
speed reducer
wheel
input shaft
gear
Prior art date
Application number
PCT/JP2014/068536
Other languages
French (fr)
Japanese (ja)
Inventor
雄一 伊藤
眞也 大岡
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 WO2015008702A1 publication Critical patent/WO2015008702A1/en

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    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0482—Gearings with gears having orbital motion
    • F16H57/0486—Gearings with gears having orbital motion with fixed gear ratio
    • 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
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
    • B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion
    • 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
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
    • F16H57/0423—Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
    • F16H57/0424—Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0476—Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof
    • 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
    • B60K2007/0038—Disposition of motor in, or adjacent to, traction wheel the motor moving together with the wheel axle
    • 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
    • B60K2007/0092—Disposition of motor in, or adjacent to, traction wheel the motor axle being coaxial to the wheel axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/03—Lubrication
    • 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
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
    • F16H2001/325—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear comprising a carrier with pins guiding at least one orbital gear with circular holes

Definitions

  • the present invention relates to a lubrication structure inside a cycloid reduction gear used for an in-wheel motor drive device.
  • the in-wheel motor drive device is installed in an inner space portion of a wheel of an automobile, and as shown in FIG. 8, a motor 101 that generates a driving force, and a speed reducer that decelerates and outputs the rotation of the motor 101. 102 and a wheel hub 103 that transmits the output from the speed reducer 102 to the wheel.
  • the motor 101 and the speed reducer 102 each have a motor casing 104a and a speed reducer casing 104b, and the motor casing 104a and the speed reducer casing 104b are connected in the axial direction.
  • the in-wheel motor drive device shown in FIG. 8 requires a large rotational drive torque to drive the wheels, and employs a cycloid type as the speed reducer 102 that decelerates the rotation of the motor 101.
  • the reduction gear casing 104b is provided with an oil tank 105 for lubricating oil at the lower portion, the lubricating oil in the oil tank 105 is sucked by the oil pump 106, and the lubricating oil is supplied to the motor 101 and the reduction gear 102 for lubrication and cooling.
  • Patent Document 1 Patent Document 1
  • An oil supply passage 107 that supplies lubricating oil to the inside of the speed reducer 2 extends rearward along the inside of the motor casing 104 a from the discharge port of the oil pump 106 that is driven in synchronization with the rotation of the pin holder 123, and An internal passage 111 of the input shaft 110 of the speed reducer 102 through the internal passage 109 from the rear end portion, and input shaft oil supply holes 112a and 112b provided in the input shaft 110 in a radial direction so as to communicate with the internal passage 111 are configured. Is done.
  • the cycloid reduction gear 102 is formed on the outer periphery of the outer gear 114 by rotatably supporting the outer gear 114 by an eccentric shaft portion 113 provided on the input shaft 110.
  • the external gear 115 meshes with the external pin 117 of the internal gear 116 incorporated inside the speed reducer casing 104b, and the external gear 114 is caused to swing eccentrically by the rotation of the input shaft 110, and the rotation of the external gear 114 is input.
  • the output is output from an output shaft 118 arranged coaxially with the shaft 110.
  • one end of the input shaft 110 is connected to the motor shaft 108 of the motor 101 by spline fitting and is rotated by the motor 101, and an eccentric shaft 113 is provided at the other end. (See FIG. 8).
  • a pair of eccentric shaft portions 113 are provided in the axial direction of the input shaft 110, and the pair of eccentric shaft portions 113 are provided such that the center of the cylindrical outer diameter surface is 180 degrees out of phase in the circumferential direction.
  • a bearing 119 is fitted to the outer diameter surface of each of the eccentric shaft portions 113.
  • the external gear 114 is rotatably supported by a bearing 119, and the external teeth 115 formed on the outer periphery thereof have a trochoidal curved tooth profile.
  • a plurality of pin holes 120 are formed at equal intervals on one circle centered on the rotation axis, and the inner pins 121 are inserted into the pair of pin holes 120 arranged in the axial direction with a margin.
  • a part of the outer periphery of the roller 122 rotatably supported by the inner pin 121 is in contact with a part of the inner periphery of the pin hole 120.
  • the roller 122 provided on the outer periphery of the inner pin 121 is a needle roller bearing.
  • the roller 122 enables an eccentric oscillating movement of the external gear 114, and the pin holder 123 that supports both ends of the inner pin 121 is rotated by the rotation of the external gear 114, and an output shaft 118 provided at the axis of the pin holder 123.
  • the wheel hub 103 is rotated (see FIG. 8).
  • the outer pin 117 is supported by an outer pin housing 126 that is prevented from rotating on the inner diameter surface of the reduction gear casing 104b.
  • the outer pin housing 126 includes a cylindrical portion 126a provided on the inner diameter surface of the reduction gear casing 104b, and a pair of flanges 126b formed inward from both ends of the cylindrical portion 126a.
  • the outer pins 117 are rotatably supported via bearings 128 in outer pin mounting holes 127 provided coaxially with the outer pins 117 in the pair of flanges 12b of the outer pin housing 126 at both ends thereof. .
  • the lubricating oil supplied by the oil pump 106 is discharged from the input shaft supply holes 112a and 112b of the input shaft 110 by centrifugal force. Gears and bearings are lubricated.
  • the outer pin 117 of the outer pin housing 126 is located away from the center of the speed reducer casing 104b, the lubricating oil released by centrifugal force is difficult to reach the bearing 128 incorporated in the outer pin assembly hole 127.
  • the lubricity of the bearing 128 is inferior, and there is a concern about the influence on the bearing life. In particular, there is a concern about the influence of the bearing life of the bearing 128 of the outer pin 117 that hits the upper portion of the vehicle body in the vertical direction with respect to the input shaft 110.
  • an object of the present invention is to improve the lubrication performance of the outer pin bearing located at a position away from the center of the reduction gear casing.
  • a motor a speed reducer that decelerates the rotation output from the rotor of the motor, and a hub wheel that transmits the rotation output from the speed reducer to the drive wheels.
  • the speed reducer is incorporated in a speed reducer casing and is prevented from rotating by an input shaft that is rotationally driven by the motor, an external gear that is rotatably supported by an eccentric shaft portion provided on the input shaft.
  • An internal gear formed on the outer periphery of the external gear, and an internal gear having a larger number of teeth than the external gear.
  • the outer pin housing is formed by an outer pin supported by an outer pin housing fixed to the inner diameter surface of the speed reducer casing, and the outer pin housing is provided with a cylindrical portion provided on the inner diameter surface of the speed reducer casing, and inward from both ends of the cylindrical portion.
  • a pair of formed A pair of flanges of the outer pin housing is provided with an outer pin mounting hole coaxially with the outer pin constituting the inner teeth, and the outer pin can be rotated freely by a bearing incorporated in the outer pin mounting hole.
  • a cycloid reducer that is supported, causes the external gear to eccentrically swing by rotation of the input shaft, and outputs the rotation of the external gear from an output shaft disposed coaxially with the input shaft;
  • a lubricating oil introduction portion that guides the lubricating oil toward the outer pin mounting holes formed in the pair of flanges is formed in the cylindrical portion of the outer pin housing.
  • the lubricating oil introduction portion of the cylindrical portion of the outer pin housing is formed by an inclined guide wall that is inclined from the axial central portion toward the outer pin mounting hole formed in the pair of flanges. If the pin housing is provided so as to be positioned above the vertical direction of the vehicle body, the lubricating oil can easily flow into all the outer pin mounting holes provided in the circumferential direction.
  • the lubricating oil can more easily flow into the outer pin assembly hole along the projecting portion.
  • the projecting portion can be used as an axial retainer for the bearing incorporated in the outer pin assembly hole.
  • the lubrication oil is well supplied to the bearing of the outer pin located at a position away from the center of the reducer casing. Life expectancy can be improved.
  • FIG. 5 is a partial perspective view of an outer pin housing cut in the direction of arrow B in FIG. 4.
  • FIG. 4 It is a partial expanded vertical front view which shows the other example of the in-wheel motor drive device which concerns on this invention.
  • the in-wheel motor drive device installed on the inside of the wheel includes a motor 1, a speed reducer 2 that decelerates and outputs rotation from the motor 1, and rotation from the speed reducer 2. It consists of a wheel hub 3 that rotatably supports a wheel that is driven to rotate.
  • the motor 1 and the speed reducer 2 each have a motor casing 4a and a speed reducer casing 4b, and the motor casing 4a and the speed reducer casing 4b are connected in the axial direction.
  • the motor 1 is of a radial gap type in which a stator 5 is provided on the inner peripheral surface of a motor casing 4a, and a rotor 6 is provided at an interval on the inner periphery of the stator 5.
  • the rotor 6 has a motor shaft 7 in the center.
  • the motor shaft 7 is connected to the input shaft 12 of the speed reducer 2 and inserted into the speed reducer casing 4b, and is rotatable with respect to the motor casing 4a by a bearing 8. It is supported by.
  • the reducer casing 4b is provided with an oil tank 9 for lubricating oil at the lower part, and the lubricating oil in the oil tank 9 is sucked by the oil pump 10 and supplied to the motor 1 and the reducer 2 for lubrication and cooling. Is going.
  • An oil supply passage 11 for supplying lubricating oil to the inside of the speed reducer 2 extends rearward along the inner side of the motor casing 4 a from the discharge port of the oil pump 10 that is driven in synchronization with the rotation of the pin holder 29.
  • a motor shaft oil supply hole 16 for supplying lubricating oil to the motor 1 is provided in the internal passage 12 of the motor shaft 7.
  • Lubricating oil flows into the oil tank 9 from the discharge port 18 provided at the bottom of the speed reducer casing 4 b, and is circulated through a path that reaches the oil pump 10 through the suction passage 17.
  • the cycloid speed reducer 2 rotatably supports an external gear 20 by an eccentric shaft portion 19 provided on the input shaft 13, and external teeth 21 formed on the outer periphery of the external gear 20 are provided inside the speed reducer casing 4b. Is engaged with the outer pin 23 of the internal gear 22 incorporated in the shaft, and the external gear 20 is eccentrically oscillated by the rotation of the input shaft 13, and the rotation of the external gear 20 is output coaxially with the input shaft 13. The wheel hub 3 is rotated by outputting from the shaft 24.
  • the input shaft 13 is connected to the motor shaft 7 of the rotor 6 by spline fitting at one end thereof and is rotationally driven by the motor 1, and an eccentric shaft portion 19 is provided at the other end.
  • a pair of eccentric shaft portions 19 are provided in the axial direction of the input shaft 13.
  • the pair of eccentric shaft portions 19 is provided such that the center of the cylindrical outer diameter surface is 180 degrees out of phase in the circumferential direction, and a bearing 25 is fitted to each outer diameter surface of the pair of eccentric shaft portions 19. Has been.
  • the external gear 20 is rotatably supported by a bearing 25, and the external teeth 21 formed on the outer periphery thereof have a trochoidal curve tooth profile.
  • a plurality of pin holes 26 are formed at equal intervals on one circle centered on the rotation axis, and an inner pin 27 is inserted into each of the pair of pin holes 26 arranged in the axial direction with a margin.
  • a part of the outer periphery of the roller 28 rotatably supported by the inner pin 27 is in contact with a part of the inner periphery of the pin hole 26.
  • the roller 28 is composed of a needle roller bearing as shown in FIG.
  • the roller 28 enables the eccentric gear 20 to swing eccentrically, and rotates the pin holder 29 that supports both ends of the inner pin 27 by the rotation of the outer gear 20, so that an output shaft provided at the axis of the pin holder 29 is rotated. 24 is output.
  • the pin holder 29 has a pair of annular plates 30a and 30b arranged to face each other in the axial direction.
  • the annular plates 30 a and 30 b have cylindrical portions 31 a and 31 b at the shaft center, are rotatably supported by bearings 32 provided on the outer diameter surface of the input shaft 13, and support the end portion of the inner pin 27. Yes.
  • the output shaft 24 is integrally provided at the center of the cylindrical portion 31a of the outer side annular plate 30a.
  • the drive shaft 33 of the oil pump 10 is integrally formed at the center of the cylindrical portion 31b of the inner annular plate 30b.
  • the outer side indicates the outside of the vehicle body, that is, the wheel hub side of the in-wheel motor driving device
  • the inner side indicates the inside of the vehicle body, that is, the motor side of the in-wheel motor driving device.
  • the internal teeth provided on the inner periphery of the internal gear 22 have an arc tooth shape formed by the external pin 23, and the number of teeth of the internal tooth formed by the external pin 23 is the external gear. More than the 20 external teeth 21.
  • the outer pin 23 is supported by a floating supported outer pin housing 40 having a gap with the inner diameter surface of the reduction gear casing 4b.
  • the outer pin housing 40 is prevented from rotating on the reduction gear casing 4b by keying or the like.
  • the outer pin housing 40 includes a cylindrical portion 40a provided on the inner diameter surface of the speed reducer casing 4b, and a pair of flanges 40b formed inward from both ends of the cylindrical portion 40a.
  • the pair of flanges 40b of the outer pin housing 40 are respectively provided with outer pin mounting holes 41 coaxially with the outer pins 23 constituting the inner teeth, and the outer pins are mounted by bearings 42 incorporated in the outer pin mounting holes 41. 23 is rotatably supported.
  • a lubricating oil introduction portion that guides the lubricating oil to the outer pin assembly hole 44 is formed in the cylindrical portion 40 a in the vertical direction of the vehicle body of the outer pin housing 40. Yes.
  • an inclined guide wall 43 that is inclined from the central portion in the axial direction toward the outer pin mounting holes 41 at both ends is formed.
  • the inclined guide wall 43 that is inclined toward the outer pin assembly hole 41 in the cylindrical portion 40a of the outer pin housing 40 allows the lubricating oil released by the centrifugal force from the input shaft supply holes 15a and 15b of the input shaft 13 to be removed from the outer pin. It is guided to the bearing 42 incorporated in the assembly hole 41.
  • the cylindrical portion 40a of the outer pin housing 40 is provided with a protruding portion 45 at the central portion in the circumferential direction of the inclined guide wall 43 inclined toward the outer pin mounting hole 41.
  • the inner surface shape of the inclined guide wall 43 is formed in a conical shape, but it may be a triangular pyramid or other R shape, and the lubricating oil released by centrifugal force is used as the outer pin. Any inclined shape that leads to the bearing 42 incorporated in the built-in hole 41 may be used.
  • the inclined guide wall 43 which is a lubricant introduction portion, to enable downsizing of the in-wheel motor drive device. When doing so, you may provide a lubricating oil introduction part in the perimeter of the cylindrical part 40a.
  • the wheel hub 3 includes a hub wheel 51 that transmits the rotation of the output shaft 24 of the speed reducer 2 to the wheel, a bearing inner ring 52 that is connected and integrated with the hub wheel 51, and the bearing inner ring 52. And a bearing outer ring 53 provided outside the hub ring 51.
  • a vehicle body mounting flange 54 is provided on the outer diameter surface of the bearing outer ring 53.
  • the vehicle body mounting flange 54 is abutted against the end face of the speed reducer casing 4b, and is attached to the speed reducer casing 4b by tightening a bolt 55 screwed into the end face.
  • the bearing inner ring 52 is fitted to the outer diameter surface of the hub ring 51 and coupled and integrated by a bolt 56.
  • the bearing outer ring 53 and the bearing inner ring 52 are rotatably supported by rolling elements 57.
  • a sealing member 58 is provided outside the rolling element 57, and the sealing member 58 closes both end openings of the bearing outer ring 53.
  • a wheel mounting flange 59 is provided on the outer diameter surface of the outer of the hub wheel 52, and a brake rotor and a wheel wheel are mounted by a plurality of bolts 60 provided on the wheel mounting flange 59.
  • the in-wheel motor drive device has the above-described structure.
  • the rotor 6 is rotationally driven by energization of the stator 5 of the motor 1, the rotation of the rotor 6 is transmitted to the input shaft 13 of the speed reducer 2, and the input shaft 13 is Rotate.
  • the eccentric shaft portion 19 rotates eccentrically by the rotation of the input shaft 13.
  • the external gear 20 is rotatably supported by the eccentric shaft portion 19, and the external teeth 21 formed on the outer periphery of the external gear 20 are attached to the external pin 23 of the internal gear 22 that is prevented from rotating around the speed reducer casing 4b. Since the number of teeth of the external teeth 21 is smaller than the number of teeth of the external pins 23 of the internal gear 22, the external gear 20 is eccentrically oscillated by the eccentric rotation of the eccentric shaft portion 19, and the input shaft 13 is rotated. Rotates in the opposite direction. The rotation is transmitted to the output shaft 24 via the inner pin 27 and the pin holder 29, and the output shaft 24 rotates at a reduced speed.
  • the lubricating oil When the lubricating oil is released from the input shaft supply holes 15a and 15b of the input shaft 13 by centrifugal force, the lubricating oil hits the cylindrical portion 40a of the outer pin housing 40 and follows the inner surface shape of the inclined guide wall 43 along the outer pin mounting hole. The bearing 42 is guided into the bearing 42 so that the bearing 42 is lubricated satisfactorily.
  • a radial gap type motor is shown as the motor 1, but an axial gap type motor may be used.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Details Of Gearings (AREA)
  • Retarders (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

The present invention addresses the problem of improving the lubricity of the bearings (42) of outer pins (23) that are located at a distance from the center of a speed reducer casing (4b) in an in-wheel motor driving device that uses a cycloidal speed reducer for the speed reducer (2). An in-wheel motor driving device that uses a cycloidal speed reducer and is configured so that: outer pin insertion holes (41) are provided on the same axis as the outer pins (23) on a pair of flanges (40b) of an outer pin housing (40); the outer pins (23) are supported to rotate freely by bearings (42) that are inserted in said outer pin insertion holes (41); an external gear (21) is made oscillate eccentrically by rotation of the input shaft (13); and the rotation of said external gear (21) is output from an output shaft (24) disposed on the same axis as the input shaft (13). The in-wheel motor driving device is configured so that a sloped inner guiding wall (43), which slopes from the center of the axial direction towards the outer pin insertion holes (41), is formed on the cylindrical section (40a) of the outer pin housing (40), and lubricating oil is supplied to bearings (42) inserted inside the outer pin insertion holes (41) along the sloped inner guiding wall (43).

Description

インホイールモータ駆動装置In-wheel motor drive device
　この発明は、インホイールモータ駆動装置に使用するサイクロイド式の減速機内部の潤滑構造に関する。 The present invention relates to a lubrication structure inside a cycloid reduction gear used for an in-wheel motor drive device.
　インホイールモータ駆動装置は、自動車のホイールの内側空間部分に設置されるものであり、図８に示すように、駆動力を発生させるモータ１０１と、モータ１０１の回転を減速して出力する減速機１０２と、減速機１０２からの出力をホイールに伝える車輪ハブ１０３とを備える。 The in-wheel motor drive device is installed in an inner space portion of a wheel of an automobile, and as shown in FIG. 8, a motor 101 that generates a driving force, and a speed reducer that decelerates and outputs the rotation of the motor 101. 102 and a wheel hub 103 that transmits the output from the speed reducer 102 to the wheel.
　上記モータ１０１および減速機１０２は、モータケーシング１０４ａ、減速機ケーシング１０４ｂをそれぞれ有し、そのモータケーシング１０４ａ、減速機ケーシング１０４ｂは軸方向に接続されている。 The motor 101 and the speed reducer 102 each have a motor casing 104a and a speed reducer casing 104b, and the motor casing 104a and the speed reducer casing 104b are connected in the axial direction.
　図８に示すインホイールモータ駆動装置は、車輪を駆動するために大きな回転駆動トルクが要求され、モータ１０１の回転を減速する減速機１０２に、サイクロイド式のものを採用している。 The in-wheel motor drive device shown in FIG. 8 requires a large rotational drive torque to drive the wheels, and employs a cycloid type as the speed reducer 102 that decelerates the rotation of the motor 101.
　減速機ケーシング１０４ｂには、下部に潤滑油のオイルタンク１０５が設けられ、オイルタンク１０５内の潤滑油をオイルポンプ１０６によって吸い込み、モータ１０１と減速機１０２に潤滑油を供給し、潤滑と冷却を行っている（特許文献１）。 The reduction gear casing 104b is provided with an oil tank 105 for lubricating oil at the lower portion, the lubricating oil in the oil tank 105 is sucked by the oil pump 106, and the lubricating oil is supplied to the motor 101 and the reduction gear 102 for lubrication and cooling. (Patent Document 1).
　潤滑油を減速機２の内部に供給する給油通路１０７は、ピンホルダ１２３の回転に同期して駆動されるオイルポンプ１０６の吐出口からモータケーシング１０４ａの内側に沿って後方に延び、モータ軸１０８の後端部からその内部通路１０９を経て、減速機１０２の入力軸１１０の内部通路１１１、その内部通路１１１に連通するよう入力軸１１０に径方向に設けられた入力軸給油孔１１２ａ、１１２ｂによって構成される。 An oil supply passage 107 that supplies lubricating oil to the inside of the speed reducer 2 extends rearward along the inside of the motor casing 104 a from the discharge port of the oil pump 106 that is driven in synchronization with the rotation of the pin holder 123, and An internal passage 111 of the input shaft 110 of the speed reducer 102 through the internal passage 109 from the rear end portion, and input shaft oil supply holes 112a and 112b provided in the input shaft 110 in a radial direction so as to communicate with the internal passage 111 are configured. Is done.
　サイクロイド式の減速機１０２は、図９及び図１０に示すように、入力軸１１０に設けられた偏心軸部１１３によって外歯車１１４を回転自在に支持し、その外歯車１１４の外周に形成された外歯１１５を減速機ケーシング１０４ｂの内側に組み込まれた内歯車１１６の外ピン１１７に噛合し、上記入力軸１１０の回転により外歯車１１４を偏心揺動運動させ、その外歯車１１４の自転を入力軸１１０と同軸上に配置された出力軸１１８から出力するようにしている。 As shown in FIGS. 9 and 10, the cycloid reduction gear 102 is formed on the outer periphery of the outer gear 114 by rotatably supporting the outer gear 114 by an eccentric shaft portion 113 provided on the input shaft 110. The external gear 115 meshes with the external pin 117 of the internal gear 116 incorporated inside the speed reducer casing 104b, and the external gear 114 is caused to swing eccentrically by the rotation of the input shaft 110, and the rotation of the external gear 114 is input. The output is output from an output shaft 118 arranged coaxially with the shaft 110.
　ここで、入力軸１１０は、その一端部がスプライン嵌合によりモータ１０１のモータ軸１０８に接続されてモータ１０１により回転駆動されるようになっており、その他端部に偏心軸部１１３が設けられている（図８参照）。 Here, one end of the input shaft 110 is connected to the motor shaft 108 of the motor 101 by spline fitting and is rotated by the motor 101, and an eccentric shaft 113 is provided at the other end. (See FIG. 8).
　偏心軸部１１３は、入力軸１１０の軸方向に一対設けられ、その一対の偏心軸部１１３は、円筒状外径面の中心が周方向に１８０°位相がずれるようにして設けられ、その一対の偏心軸部１１３のそれぞれ外径面に軸受１１９が嵌合されている。 A pair of eccentric shaft portions 113 are provided in the axial direction of the input shaft 110, and the pair of eccentric shaft portions 113 are provided such that the center of the cylindrical outer diameter surface is 180 degrees out of phase in the circumferential direction. A bearing 119 is fitted to the outer diameter surface of each of the eccentric shaft portions 113.
　外歯車１１４は、軸受１１９によって回転自在に支持され、その外周に形成された外歯１１５はトロコイド曲線歯形とされている。外歯車１１４には、回転軸心を中心とする一つの円上に複数のピン孔１２０が等間隔に形成され、軸方向に並ぶ一対のピン孔１２０のそれぞれに内ピン１２１が余裕をもって挿入され、その内ピン１２１に回転自在に支持されたころ１２２の外周一部がピン孔１２０の内周一部に接触している。 The external gear 114 is rotatably supported by a bearing 119, and the external teeth 115 formed on the outer periphery thereof have a trochoidal curved tooth profile. In the external gear 114, a plurality of pin holes 120 are formed at equal intervals on one circle centered on the rotation axis, and the inner pins 121 are inserted into the pair of pin holes 120 arranged in the axial direction with a margin. A part of the outer periphery of the roller 122 rotatably supported by the inner pin 121 is in contact with a part of the inner periphery of the pin hole 120.
　内ピン１２１の外周に設けられたころ１２２は、針状ころ軸受からなる。ころ１２２は外歯車１１４の偏心揺動運動を可能とし、その外歯車１１４の自転により内ピン１２１の両端部を支持するピンホルダ１２３を回転させ、そのピンホルダ１２３の軸心に設けられた出力軸１１８によって車輪ハブ１０３を回転させるようにしている（図８参照）。 The roller 122 provided on the outer periphery of the inner pin 121 is a needle roller bearing. The roller 122 enables an eccentric oscillating movement of the external gear 114, and the pin holder 123 that supports both ends of the inner pin 121 is rotated by the rotation of the external gear 114, and an output shaft 118 provided at the axis of the pin holder 123. Thus, the wheel hub 103 is rotated (see FIG. 8).
　外ピン１１７は、減速機ケーシング１０４ｂの内径面に回り止めされた外ピンハウジング１２６に支持されている。外ピンハウジング１２６は、減速機ケーシング１０４ｂの内径面に設けられた円筒部１２６ａと、円筒部１２６ａの両端から内向きに形成された一対のフランジ１２６ｂとからなる。 The outer pin 117 is supported by an outer pin housing 126 that is prevented from rotating on the inner diameter surface of the reduction gear casing 104b. The outer pin housing 126 includes a cylindrical portion 126a provided on the inner diameter surface of the reduction gear casing 104b, and a pair of flanges 126b formed inward from both ends of the cylindrical portion 126a.
　前記外ピン１１７は、その両端にある外ピンハウジング１２６の一対のフランジ１２ｂに外ピン１１７と同軸上に設けられた外ピン組込孔１２７に、軸受１２８を介して回転自在に支持されている。 The outer pins 117 are rotatably supported via bearings 128 in outer pin mounting holes 127 provided coaxially with the outer pins 117 in the pair of flanges 12b of the outer pin housing 126 at both ends thereof. .
特開２００９－６３０４３号公報JP 2009-63043 A
　ところで、減速機１０２の下部のオイルタンク１０５には、オイルポンプ１０６により供給された潤滑油を入力軸１１０の入力軸供給孔１１２ａ、１１２ｂから遠心力によって放出することにより、減速機ケーシング１０４ｂ内の歯車や軸受の潤滑を行っている。 By the way, in the oil tank 105 below the speed reducer 102, the lubricating oil supplied by the oil pump 106 is discharged from the input shaft supply holes 112a and 112b of the input shaft 110 by centrifugal force. Gears and bearings are lubricated.
　ところが、外ピンハウジング１２６の外ピン１１７は、減速機ケーシング１０４ｂの中心から離れた位置にあるため、遠心力により放出された潤滑油が外ピン組込孔１２７に組み込んだ軸受１２８に届き難く、軸受１２８の潤滑性に劣り、軸受寿命への影響が懸念される。特に入力軸１１０に対し車体鉛直方向の上部に当る外ピン１１７の軸受１２８の軸受寿命の影響が懸念される。 However, since the outer pin 117 of the outer pin housing 126 is located away from the center of the speed reducer casing 104b, the lubricating oil released by centrifugal force is difficult to reach the bearing 128 incorporated in the outer pin assembly hole 127. The lubricity of the bearing 128 is inferior, and there is a concern about the influence on the bearing life. In particular, there is a concern about the influence of the bearing life of the bearing 128 of the outer pin 117 that hits the upper portion of the vehicle body in the vertical direction with respect to the input shaft 110.
　そこで、この発明は、減速機ケーシングの中心から離れた位置にある外ピンの軸受に対する潤滑性能を向上させることを課題とする。 Therefore, an object of the present invention is to improve the lubrication performance of the outer pin bearing located at a position away from the center of the reduction gear casing.
　上記の課題を解決するため、この発明においては、モータと、そのモータのロータから出力される回転を減速する減速機と、その減速機から出力される回転を駆動車輪に伝達するハブ輪とからなり、前記減速機が、前記モータによって回転駆動される入力軸と、その入力軸に設けられた偏心軸部に回転自在に支持された外歯車と、減速機ケーシング内に組み込まれて回り止めされ、内周に外歯車の外周に形成された外歯が噛合される内歯が形成され、その内歯の歯数が外歯より多くされた内歯車とを有し、前記内歯を、減速機ケーシングの内径面に回り止めされた外ピンハウジングに支持された外ピンによって形成し、外ピンハウジングは、減速機ケーシングの内径面に設けられた円筒部と、円筒部の両端から内向きに形成された一対のフランジとからなり、外ピンハウジングの一対のフランジに、内歯を構成する外ピンと同軸上に外ピン組込孔を設け、その外ピン組込孔内に組み込んだ軸受により外ピンを回転自在に支持にし、前記入力軸の回転により前記外歯車を偏心揺動運動させて、その外歯車の自転を前記入力軸と同軸上に配置された出力軸から出力するようにしたサイクロイド式の減速機とされたインホイールモータ駆動装置において、前記外ピンハウジングの円筒部に、一対のフランジに形成した外ピン組込孔に向かって潤滑油を導く潤滑油導入部を形成したことを特徴とする。 In order to solve the above problems, in the present invention, a motor, a speed reducer that decelerates the rotation output from the rotor of the motor, and a hub wheel that transmits the rotation output from the speed reducer to the drive wheels. The speed reducer is incorporated in a speed reducer casing and is prevented from rotating by an input shaft that is rotationally driven by the motor, an external gear that is rotatably supported by an eccentric shaft portion provided on the input shaft. An internal gear formed on the outer periphery of the external gear, and an internal gear having a larger number of teeth than the external gear. The outer pin housing is formed by an outer pin supported by an outer pin housing fixed to the inner diameter surface of the speed reducer casing, and the outer pin housing is provided with a cylindrical portion provided on the inner diameter surface of the speed reducer casing, and inward from both ends of the cylindrical portion. A pair of formed A pair of flanges of the outer pin housing is provided with an outer pin mounting hole coaxially with the outer pin constituting the inner teeth, and the outer pin can be rotated freely by a bearing incorporated in the outer pin mounting hole. A cycloid reducer that is supported, causes the external gear to eccentrically swing by rotation of the input shaft, and outputs the rotation of the external gear from an output shaft disposed coaxially with the input shaft; In the in-wheel motor drive device, a lubricating oil introduction portion that guides the lubricating oil toward the outer pin mounting holes formed in the pair of flanges is formed in the cylindrical portion of the outer pin housing.
　外ピンによって形成される内歯車の内周で外歯車が回転して、減速機ケーシング内の潤滑油が跳ね上げられると、潤滑油は、外ピンハウジングの円筒部に当たって外ピンハウジングの円筒部に形成した潤滑油導入部に沿って外ピン組込孔内に組み込んだ軸受に導かれる。 When the external gear rotates on the inner circumference of the internal gear formed by the external pin and the lubricating oil in the reduction gear casing is sprung up, the lubricating oil hits the cylindrical part of the external pin housing and hits the cylindrical part of the external pin housing. Along the formed lubricating oil introduction portion, it is guided to a bearing incorporated in the outer pin assembly hole.
　前記外ピンハウジングの円筒部の潤滑油導入部が、軸方向の中央部から一対のフランジに形成した外ピン組込孔に向かって傾斜する傾斜案内壁で形成し、前記傾斜案内壁は、外ピンハウジングの車体の鉛直方向の上方に位置するように設けると、円周方向に設けられた全ての外ピン組込孔に潤滑油が流れ込み易くなる。 The lubricating oil introduction portion of the cylindrical portion of the outer pin housing is formed by an inclined guide wall that is inclined from the axial central portion toward the outer pin mounting hole formed in the pair of flanges. If the pin housing is provided so as to be positioned above the vertical direction of the vehicle body, the lubricating oil can easily flow into all the outer pin mounting holes provided in the circumferential direction.
　また、前記傾斜案内壁の内面に、外ピン組込孔に向かう突状部を形成することにより、突状部に沿って外ピン組込孔に潤滑油がより流れ込み易くなる。 Further, by forming a projecting portion toward the outer pin assembly hole on the inner surface of the inclined guide wall, the lubricating oil can more easily flow into the outer pin assembly hole along the projecting portion.
　前記突状部は、外ピン組込孔内に組み込んだ軸受の軸方向押さえにすることができる。 The projecting portion can be used as an axial retainer for the bearing incorporated in the outer pin assembly hole.
　この発明に係るインホイールモータ駆動装置においては、上記のように、減速機ケーシングの中心から離れた位置にある外ピンの軸受に対しても潤滑油の供給が良好であるため、装置全体の長寿命化が図れる。 In the in-wheel motor drive device according to the present invention, as described above, the lubrication oil is well supplied to the bearing of the outer pin located at a position away from the center of the reducer casing. Life expectancy can be improved.
この発明に係るインホイールモータ駆動装置の縦断正面図である。It is a vertical front view of the in-wheel motor drive device concerning this invention. 図１のII線に沿った縦断側面図である。It is a vertical side view along the II line of FIG. 図１のIII線に沿った縦断側面図である。It is a vertical side view along the III line of FIG. 図１の部分拡大図である。It is the elements on larger scale of FIG. 図４の矢印Ｂの方向で切断した外ピンハウジングの部分断面図である。It is a fragmentary sectional view of the outer pin housing cut | disconnected in the direction of the arrow B of FIG. 図４の矢印Ｂの方向で切断した外ピンハウジングの部分斜視図である。FIG. 5 is a partial perspective view of an outer pin housing cut in the direction of arrow B in FIG. 4. この発明に係るインホイールモータ駆動装置の他の例を示す部分拡大縦断正面図である。It is a partial expanded vertical front view which shows the other example of the in-wheel motor drive device which concerns on this invention. 従来例を示す縦断正面図である。It is a vertical front view which shows a prior art example. 図８のIX線に沿った縦断側面図である。It is a vertical side view along the IX line of FIG. 図８の部分拡大図である。It is the elements on larger scale of FIG.
　以下、この発明の実施の形態を図面に基づいて説明する。
　ホイールの内側に設置されるインホイールモータ駆動装置は、図１に示すように、モータ１と、そのモータ１からの回転を減速して出力する減速機２と、その減速機２からの回転によって回転駆動される車輪を回転自在に支持する車輪ハブ３とからなる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the in-wheel motor drive device installed on the inside of the wheel includes a motor 1, a speed reducer 2 that decelerates and outputs rotation from the motor 1, and rotation from the speed reducer 2. It consists of a wheel hub 3 that rotatably supports a wheel that is driven to rotate.
　上記モータ１および減速機２は、モータケーシング４ａ、減速機ケーシング４ｂをそれぞれ有し、そのモータケーシング４ａ、減速機ケーシング４ｂは軸方向に接続されている。 The motor 1 and the speed reducer 2 each have a motor casing 4a and a speed reducer casing 4b, and the motor casing 4a and the speed reducer casing 4b are connected in the axial direction.
　モータ１は、モータケーシング４ａの内周面にステータ５を設け、このステータ５の内周に間隔をおいてロータ６を設けたラジアルギャップタイプのものを使用している。 The motor 1 is of a radial gap type in which a stator 5 is provided on the inner peripheral surface of a motor casing 4a, and a rotor 6 is provided at an interval on the inner periphery of the stator 5.
　ロータ６は、モータ軸７を中心部に有し、そのモータ軸７は減速機２の入力軸１２に接続されて減速機ケーシング４ｂ内に挿入され、軸受８によってモータケーシング４ａに対して回転自在に支持されている。 The rotor 6 has a motor shaft 7 in the center. The motor shaft 7 is connected to the input shaft 12 of the speed reducer 2 and inserted into the speed reducer casing 4b, and is rotatable with respect to the motor casing 4a by a bearing 8. It is supported by.
　減速機ケーシング４ｂには、下部に潤滑油のオイルタンク９が設けられ、オイルタンク９内の潤滑油をオイルポンプ１０によって吸い込み、モータ１と減速機２に潤滑油を供給し、潤滑と冷却を行っている。 The reducer casing 4b is provided with an oil tank 9 for lubricating oil at the lower part, and the lubricating oil in the oil tank 9 is sucked by the oil pump 10 and supplied to the motor 1 and the reducer 2 for lubrication and cooling. Is going.
　潤滑油を減速機２の内部に供給する給油通路１１は、ピンホルダ２９の回転に同期して駆動されるオイルポンプ１０の吐出口からモータケーシング４ａの内側に沿って後方に延び、モータ軸７の後端部からその内部通路１２を経て、減速機２の入力軸１３の内部通路１４、その内部通路１４に連通するよう入力軸１３に径方向に設けられた入力軸給油孔１５ａ、１５ｂによって構成される。また、モータ軸７の内部通路１２には、モータ１に潤滑油を給油するためのモータ軸給油孔１６が設けられている。 An oil supply passage 11 for supplying lubricating oil to the inside of the speed reducer 2 extends rearward along the inner side of the motor casing 4 a from the discharge port of the oil pump 10 that is driven in synchronization with the rotation of the pin holder 29. An internal passage 14 of the input shaft 13 of the speed reducer 2 through the internal passage 12 from the rear end, and input shaft oil supply holes 15a and 15b provided in the input shaft 13 in a radial direction so as to communicate with the internal passage 14 Is done. A motor shaft oil supply hole 16 for supplying lubricating oil to the motor 1 is provided in the internal passage 12 of the motor shaft 7.
　潤滑油は、減速機ケーシング４ｂの底部に設けられた排出口１８からオイルタンク９に流れ込み、吸入通路１７を経てオイルポンプ１０に至る経路により循環される。 Lubricating oil flows into the oil tank 9 from the discharge port 18 provided at the bottom of the speed reducer casing 4 b, and is circulated through a path that reaches the oil pump 10 through the suction passage 17.
　サイクロイド式の減速機２は、入力軸１３に設けられた偏心軸部１９によって外歯車２０を回転自在に支持し、その外歯車２０の外周に形成された外歯２１を減速機ケーシング４ｂの内側に組み込まれた内歯車２２の外ピン２３に噛合し、上記入力軸１３の回転により外歯車２０を偏心揺動運動させ、その外歯車２０の自転を入力軸１３と同軸上に配置された出力軸２４から出力し、車輪ハブ３を回転させている。 The cycloid speed reducer 2 rotatably supports an external gear 20 by an eccentric shaft portion 19 provided on the input shaft 13, and external teeth 21 formed on the outer periphery of the external gear 20 are provided inside the speed reducer casing 4b. Is engaged with the outer pin 23 of the internal gear 22 incorporated in the shaft, and the external gear 20 is eccentrically oscillated by the rotation of the input shaft 13, and the rotation of the external gear 20 is output coaxially with the input shaft 13. The wheel hub 3 is rotated by outputting from the shaft 24.
　入力軸１３は、その一端部がスプライン嵌合によりロータ６のモータ軸７に接続されてモータ１により回転駆動されるようになっており、その他端部に偏心軸部１９が設けられている。 The input shaft 13 is connected to the motor shaft 7 of the rotor 6 by spline fitting at one end thereof and is rotationally driven by the motor 1, and an eccentric shaft portion 19 is provided at the other end.
　偏心軸部１９は、図４に示すように、入力軸１３の軸方向に一対設けられている。その一対の偏心軸部１９は、円筒状外径面の中心が周方向に１８０°位相がずれるようにして設けられ、その一対の偏心軸部１９のそれぞれの外径面に軸受２５が嵌合されている。 As shown in FIG. 4, a pair of eccentric shaft portions 19 are provided in the axial direction of the input shaft 13. The pair of eccentric shaft portions 19 is provided such that the center of the cylindrical outer diameter surface is 180 degrees out of phase in the circumferential direction, and a bearing 25 is fitted to each outer diameter surface of the pair of eccentric shaft portions 19. Has been.
　外歯車２０は、図３に示すように、軸受２５によって回転自在に支持され、その外周に形成された外歯２１はトロコイド曲線歯形とされている。外歯車２０には、回転軸心を中心とする一つの円上に複数のピン孔２６が等間隔に形成され、軸方向に並ぶ一対のピン孔２６のそれぞれに内ピン２７が余裕をもって挿入され、その内ピン２７に回転自在に支持されたころ２８の外周一部がピン孔２６の内周一部に接触している。 As shown in FIG. 3, the external gear 20 is rotatably supported by a bearing 25, and the external teeth 21 formed on the outer periphery thereof have a trochoidal curve tooth profile. In the external gear 20, a plurality of pin holes 26 are formed at equal intervals on one circle centered on the rotation axis, and an inner pin 27 is inserted into each of the pair of pin holes 26 arranged in the axial direction with a margin. A part of the outer periphery of the roller 28 rotatably supported by the inner pin 27 is in contact with a part of the inner periphery of the pin hole 26.
　ころ２８は、図４に示すように、針状ころ軸受からなる。ころ２８は外歯車２０の偏心揺動運動を可能とし、その外歯車２０の自転により内ピン２７の両端部を支持するピンホルダ２９を回転させて、そのピンホルダ２９の軸心に設けられた出力軸２４から出力させるようにしている。 The roller 28 is composed of a needle roller bearing as shown in FIG. The roller 28 enables the eccentric gear 20 to swing eccentrically, and rotates the pin holder 29 that supports both ends of the inner pin 27 by the rotation of the outer gear 20, so that an output shaft provided at the axis of the pin holder 29 is rotated. 24 is output.
　ここで、ピンホルダ２９は、軸方向に対向配置された一対の環状板３０ａ、３０ｂを有している。 Here, the pin holder 29 has a pair of annular plates 30a and 30b arranged to face each other in the axial direction.
　環状板３０ａ、３０ｂは、軸心に筒部３１ａ、３１ｂを有し、入力軸１３の外径面上に設けられた軸受３２によって回転自在に支持され、内ピン２７の端部を支持している。 The annular plates 30 a and 30 b have cylindrical portions 31 a and 31 b at the shaft center, are rotatably supported by bearings 32 provided on the outer diameter surface of the input shaft 13, and support the end portion of the inner pin 27. Yes.
　アウタ側の環状板３０ａの筒部３１ａの中心には、出力軸２４が一体に設けられている。 The output shaft 24 is integrally provided at the center of the cylindrical portion 31a of the outer side annular plate 30a.
　インナ側の環状板３０ｂの筒部３１ｂの中心には、オイルポンプ１０の駆動軸３３が一体に形成されている。ここで、アウタ側とは車体の外側を、すなわちインホイールモータ駆動装置の車輪ハブ側を、インナ側とは車体の内側を、すなわちインホイールモータ駆動装置のモータ側をそれぞれ示す。 The drive shaft 33 of the oil pump 10 is integrally formed at the center of the cylindrical portion 31b of the inner annular plate 30b. Here, the outer side indicates the outside of the vehicle body, that is, the wheel hub side of the in-wheel motor driving device, and the inner side indicates the inside of the vehicle body, that is, the motor side of the in-wheel motor driving device.
　図３に示すように、内歯車２２の内周に設けられた内歯は、外ピン２３によって形成される円弧歯形とされ、その外ピン２３によって形成される内歯の歯数は、外歯車２０の外歯２１より多くなっている。 As shown in FIG. 3, the internal teeth provided on the inner periphery of the internal gear 22 have an arc tooth shape formed by the external pin 23, and the number of teeth of the internal tooth formed by the external pin 23 is the external gear. More than the 20 external teeth 21.
　外ピン２３は、減速機ケーシング４ｂの内径面との間に隙間を有するフローティング支持された外ピンハウジング４０に支持されている。外ピンハウジング４０は、キー止め等により減速機ケーシング４ｂに回り止めされている。 The outer pin 23 is supported by a floating supported outer pin housing 40 having a gap with the inner diameter surface of the reduction gear casing 4b. The outer pin housing 40 is prevented from rotating on the reduction gear casing 4b by keying or the like.
　外ピンハウジング４０は、図４に示すように、減速機ケーシング４ｂの内径面に設けられた円筒部４０ａと、円筒部４０ａの両端から内向きに形成された一対のフランジ４０ｂとからなる。 As shown in FIG. 4, the outer pin housing 40 includes a cylindrical portion 40a provided on the inner diameter surface of the speed reducer casing 4b, and a pair of flanges 40b formed inward from both ends of the cylindrical portion 40a.
　外ピンハウジング４０の一対のフランジ４０ｂには、内歯を構成する外ピン２３と同軸上に外ピン組込孔４１をそれぞれ設け、その外ピン組込孔４１内に組み込んだ軸受４２により外ピン２３を回転自在に支持にしている。 The pair of flanges 40b of the outer pin housing 40 are respectively provided with outer pin mounting holes 41 coaxially with the outer pins 23 constituting the inner teeth, and the outer pins are mounted by bearings 42 incorporated in the outer pin mounting holes 41. 23 is rotatably supported.
　図４、図５及び図６に示すように、外ピンハウジング４０の車体の鉛直方向の上方の円筒部４０ａには、外ピン組込孔４４に潤滑油を導く潤滑油導入部が形成されている。この実施例では、軸方向の中央部から両端の外ピン組込孔４１に向かって傾斜する傾斜案内壁４３が形成されている。 As shown in FIGS. 4, 5, and 6, a lubricating oil introduction portion that guides the lubricating oil to the outer pin assembly hole 44 is formed in the cylindrical portion 40 a in the vertical direction of the vehicle body of the outer pin housing 40. Yes. In this embodiment, an inclined guide wall 43 that is inclined from the central portion in the axial direction toward the outer pin mounting holes 41 at both ends is formed.
　外ピンハウジング４０の円筒部４０ａに外ピン組込孔４１に向かって傾斜する傾斜案内壁４３は、入力軸１３の入力軸供給孔１５ａ、１５ｂから遠心力によって放出された潤滑油を、外ピン組込孔４１内に組み込んだ軸受４２に導くものである。 The inclined guide wall 43 that is inclined toward the outer pin assembly hole 41 in the cylindrical portion 40a of the outer pin housing 40 allows the lubricating oil released by the centrifugal force from the input shaft supply holes 15a and 15b of the input shaft 13 to be removed from the outer pin. It is guided to the bearing 42 incorporated in the assembly hole 41.
　外ピンハウジング４０の円筒部４０ａに外ピン組込孔４１に向かって傾斜する傾斜案内壁４３の周方向の中央部に突状部４５を設けている。傾斜案内壁４３の周方向の中央部に突状部４５を設けることにより、突状部４５に沿って外ピン組込孔４１内に組み込んだ軸受４２に潤滑油が導かれ易くなり、潤滑効果がさらに向上する。 The cylindrical portion 40a of the outer pin housing 40 is provided with a protruding portion 45 at the central portion in the circumferential direction of the inclined guide wall 43 inclined toward the outer pin mounting hole 41. By providing the projecting portion 45 at the center portion in the circumferential direction of the inclined guide wall 43, the lubricating oil can be easily guided to the bearing 42 incorporated in the outer pin assembly hole 41 along the projecting portion 45, and the lubricating effect. Is further improved.
　また、図７に示すように、傾斜案内壁４３の中央部に設けた突状部４５を、軸受４２の外輪端面に到達する位置に設けると、突状部４５が外ピン組込孔４１内に組み込んだ軸受４２の軸方向押さえになる。 Further, as shown in FIG. 7, when the protruding portion 45 provided at the center of the inclined guide wall 43 is provided at a position reaching the outer ring end surface of the bearing 42, the protruding portion 45 is placed in the outer pin mounting hole 41. It becomes the axial direction presser of the bearing 42 incorporated in.
　上記傾斜案内壁４３の内面形状は、図６に示す実施形態では、円錐型に形成しているが、三角錐でも、その他のＲ形状でもよく、遠心力によって放出された潤滑油が、外ピン組込孔４１内に組み込んだ軸受４２に導く斜面形状であればよい。また、実施例では車体の鉛直方向の上方の円筒部４０ａのみに潤滑油導入部である傾斜案内壁４３を設け、インホイールモータ駆動装置の小型化を可能にしているが、組込性を考慮する場合は、円筒部４０ａの全周に潤滑油導入部を設けても良い。 In the embodiment shown in FIG. 6, the inner surface shape of the inclined guide wall 43 is formed in a conical shape, but it may be a triangular pyramid or other R shape, and the lubricating oil released by centrifugal force is used as the outer pin. Any inclined shape that leads to the bearing 42 incorporated in the built-in hole 41 may be used. In the embodiment, only the cylindrical portion 40a in the vertical direction of the vehicle body is provided with the inclined guide wall 43, which is a lubricant introduction portion, to enable downsizing of the in-wheel motor drive device. When doing so, you may provide a lubricating oil introduction part in the perimeter of the cylindrical part 40a.
　図１に示すように、車輪ハブ３は、減速機２の出力軸２４の回転を車輪に伝達するハブ輪５１と、そのハブ輪５１に接続一体化された軸受内輪５２と、その軸受内輪５２およびハブ輪５１の外側に設けられた軸受外輪５３とを有している。 As shown in FIG. 1, the wheel hub 3 includes a hub wheel 51 that transmits the rotation of the output shaft 24 of the speed reducer 2 to the wheel, a bearing inner ring 52 that is connected and integrated with the hub wheel 51, and the bearing inner ring 52. And a bearing outer ring 53 provided outside the hub ring 51.
　軸受外輪５３の外径面には車体取付フランジ５４が設けられている。車体取付フランジ５４は、減速機ケーシング４ｂの端面に衝合され、その端面にねじ込まれるボルト５５の締め付けによって減速機ケーシング４ｂに取付けられている。 A vehicle body mounting flange 54 is provided on the outer diameter surface of the bearing outer ring 53. The vehicle body mounting flange 54 is abutted against the end face of the speed reducer casing 4b, and is attached to the speed reducer casing 4b by tightening a bolt 55 screwed into the end face.
　軸受内輪５２は、ハブ輪５１の外径面に嵌合され、ボルト５６によって結合一体化されている。上記軸受外輪５３と軸受内輪５２は、転動体５７によって回転自在に支持されている。また、転動体５７の外側にはシール部材５８が設けられ、そのシール部材５８は軸受外輪５３の両端開口を閉塞している。 The bearing inner ring 52 is fitted to the outer diameter surface of the hub ring 51 and coupled and integrated by a bolt 56. The bearing outer ring 53 and the bearing inner ring 52 are rotatably supported by rolling elements 57. Further, a sealing member 58 is provided outside the rolling element 57, and the sealing member 58 closes both end openings of the bearing outer ring 53.
　ハブ輪５２のアウタの外径面には車輪取付フランジ５９が設けられ、その車輪取付フランジ５９に設けられた複数のボルト６０によってブレーキロータと車輪のホイールが取付けられている。 A wheel mounting flange 59 is provided on the outer diameter surface of the outer of the hub wheel 52, and a brake rotor and a wheel wheel are mounted by a plurality of bolts 60 provided on the wheel mounting flange 59.
　インホイールモータ駆動装置は上記の構造からなり、モータ１のステータ５に対する通電によってロータ６を回転駆動すると、そのロータ６の回転は減速機２の入力軸１３に伝達されて、その入力軸１３が回転する。 The in-wheel motor drive device has the above-described structure. When the rotor 6 is rotationally driven by energization of the stator 5 of the motor 1, the rotation of the rotor 6 is transmitted to the input shaft 13 of the speed reducer 2, and the input shaft 13 is Rotate.
　また、入力軸１３の回転により、偏心軸部１９が偏心回転する。このとき、偏心軸部１９には外歯車２０が回転自在に支持され、その外歯車２０の外周に形成された外歯２１が減速機ケーシング４ｂに回り止めされた内歯車２２の外ピン２３に噛合しており、その外歯２１の歯数は内歯車２２の外ピン２３の歯数より少ないため、偏心軸部１９の偏心回転により外歯車２０は偏心揺動運動し、入力軸１３の回転方向と逆方向に自転する。その自転は内ピン２７およびピンホルダ２９を介して出力軸２４に伝達され、出力軸２４が減速回転する。 Also, the eccentric shaft portion 19 rotates eccentrically by the rotation of the input shaft 13. At this time, the external gear 20 is rotatably supported by the eccentric shaft portion 19, and the external teeth 21 formed on the outer periphery of the external gear 20 are attached to the external pin 23 of the internal gear 22 that is prevented from rotating around the speed reducer casing 4b. Since the number of teeth of the external teeth 21 is smaller than the number of teeth of the external pins 23 of the internal gear 22, the external gear 20 is eccentrically oscillated by the eccentric rotation of the eccentric shaft portion 19, and the input shaft 13 is rotated. Rotates in the opposite direction. The rotation is transmitted to the output shaft 24 via the inner pin 27 and the pin holder 29, and the output shaft 24 rotates at a reduced speed.
　入力軸１３の入力軸供給孔１５ａ、１５ｂから遠心力によって放出されると、潤滑油は、外ピンハウジング４０の円筒部４０ａに当たり、傾斜案内壁４３の内面形状に沿って、外ピン組込孔４１内に組み込んだ軸受４２に導かれ、軸受４２の潤滑が良好に行われる。 When the lubricating oil is released from the input shaft supply holes 15a and 15b of the input shaft 13 by centrifugal force, the lubricating oil hits the cylindrical portion 40a of the outer pin housing 40 and follows the inner surface shape of the inclined guide wall 43 along the outer pin mounting hole. The bearing 42 is guided into the bearing 42 so that the bearing 42 is lubricated satisfactorily.
　図１では、モータ１としてラジアルギャップタイプのモータを示したが、アキシャルギャップタイプのモータであってもよい。 In FIG. 1, a radial gap type motor is shown as the motor 1, but an axial gap type motor may be used.
１　　　モータ
２　　　減速機
３　　　車輪ハブ
４ａ　　モータケーシング
４ｂ　　減速機ケーシング
５　　　ステータ
６　　　ロータ
７　　　モータ軸
８　　　軸受
９　　　オイルタンク
１０　　オイルポンプ
１１　　給油通路
１２　　内部通路
１３　　入力軸
１４　　内部通路
１５ａ　入力軸給油孔
１５ｂ　入力軸給油孔
１６　　モータ軸給油孔
１７　　帰還通路
１８　　排出口
１９　　偏心軸部
２０　　外歯車
２１　　外歯
２２　　内歯車
２３　　外ピン
２４　　出力軸
２５　　軸受
２６　　ピン孔
２７　　内ピン
２９　　ピンホルダ
３０ａ　環状板
３０ｂ　環状板
３１ａ　筒部
３１ｂ　筒部
３２　　軸受
３３　　駆動軸
４０　　外ピンハウジング
４０ａ　円筒部
４０ｂ　フランジ
４１　　外ピン組込孔
４２　　軸受
４３　　傾斜案内壁
４４　　軸受
４５　　突状部
５１　　ハブ輪
５２　　軸受内輪
５３　　軸受外輪
５４　　車体取付フランジ
５５　　ボルト
５６　　ボルト
５７　　転動体
５８　　シール部材
５９　　車輪取付フランジ
６０　　ボルト
  DESCRIPTION OF SYMBOLS 1 Motor 2 Reduction gear 3 Wheel hub 4a Motor casing 4b Reduction gear casing 5 Stator 6 Rotor 7 Motor shaft 8 Bearing 9 Oil tank 10 Oil pump 11 Oil supply passage 12 Internal passage 13 Input shaft 14 Internal passage 15a Input shaft oil supply hole 15b Input shaft Oil supply hole 16 Motor shaft oil supply hole 17 Return passage 18 Discharge port 19 Eccentric shaft part 20 External gear 21 External tooth 22 Internal gear 23 External pin 24 Output shaft 25 Bearing 26 Pin hole 27 Internal pin 29 Pin holder 30a Annular plate 30b Annular plate 31a Tube Portion 31b cylindrical portion 32 bearing 33 drive shaft 40 outer pin housing 40a cylindrical portion 40b flange 41 outer pin built-in hole 42 bearing 43 inclined guide wall 44 bearing 45 projecting portion 51 hub wheel 52 bearing inner ring 53 bearing outer ring 54 vehicle body mounting flange 55 Bolt 56 Bolt 57 Roll Body 58 sealing member 59 wheel mounting flange 60 volts

Claims (4)

  1. 　モータと、そのモータのロータから出力される回転を減速する減速機と、その減速機から出力される回転を駆動車輪に伝達するハブ輪とからなり、前記減速機が、前記モータによって回転駆動される入力軸と、その入力軸に設けられた偏心軸部に回転自在に支持された外歯車と、減速機ケーシング内に組み込まれて回り止めされ、内周に外歯車の外周に形成された外歯が噛合される内歯が形成され、その内歯の歯数が外歯より多くされた内歯車とを有し、前記内歯を、減速機ケーシングの内径面に回り止めされた外ピンハウジングに支持された外ピンによって形成し、外ピンハウジングは、減速機ケーシングの内径面に設けられた円筒部と、円筒部の両端から内向きに形成された一対のフランジとからなり、外ピンハウジングの一対のフランジに、内歯を構成する外ピンと同軸上に外ピン組込孔を設け、その外ピン組込孔内に組み込んだ軸受により外ピンを回転自在に支持にし、前記入力軸の回転により前記外歯車を偏心揺動運動させて、その外歯車の自転を前記入力軸と同軸上に配置された出力軸から出力するようにしたサイクロイド式の減速機とされたインホイールモータ駆動装置において、前記外ピンハウジングの円筒部に、一対のフランジに形成した外ピン組込孔に向かって潤滑油を導く潤滑油導入部を形成したことを特徴とするインホイールモータ駆動装置。 A motor, a speed reducer that decelerates the rotation output from the rotor of the motor, and a hub wheel that transmits the rotation output from the speed reducer to a drive wheel. The speed reducer is driven to rotate by the motor. Input shaft, an external gear rotatably supported by an eccentric shaft portion provided on the input shaft, and an external gear formed in the outer periphery of the external gear and incorporated in the reducer casing to prevent rotation. An outer pin housing having an inner gear with which teeth are meshed and having an inner gear in which the number of teeth of the inner teeth is larger than that of the outer teeth, and the inner teeth are prevented from rotating on the inner diameter surface of the reduction gear casing The outer pin housing is composed of a cylindrical portion provided on the inner diameter surface of the reduction gear casing and a pair of flanges formed inward from both ends of the cylindrical portion. A pair of hula An outer pin assembly hole is provided on the same axis as the outer pin constituting the inner tooth, and the outer pin is rotatably supported by a bearing incorporated in the outer pin assembly hole. In the in-wheel motor drive device, which is a cycloid type speed reducer, in which the gear is eccentrically oscillated and the rotation of the external gear is output from an output shaft arranged coaxially with the input shaft. The in-wheel motor drive device characterized by forming the lubricating oil introduction part which guides lubricating oil toward the external pin built-in hole formed in a pair of flange in the cylindrical part of the pin housing.
  2. 　前記潤滑油導入部が軸方向中央部から一対のフランジに形成した外ピン組込孔に向かって傾斜する傾斜案内壁であり、前記傾斜案内壁が、外ピンハウジングの鉛直方向の上方に位置する請求項１に記載のインホイールモータ駆動装置。 The lubricating oil introduction portion is an inclined guide wall that is inclined from an axially central portion toward an outer pin mounting hole formed in a pair of flanges, and the inclined guide wall is positioned above the vertical direction of the outer pin housing. The in-wheel motor drive device according to claim 1.
  3. 　前記傾斜案内壁の内面に、外ピン組込孔に向かう突状部を形成したことを特徴とする請求項１又は２に記載のインホイールモータ駆動装置。 The in-wheel motor drive device according to claim 1 or 2, wherein a projecting portion toward the outer pin mounting hole is formed on the inner surface of the inclined guide wall.
  4. 　前記突状部を、外ピン組込孔内に組み込んだ軸受の軸方向押さえにしたことを特徴とする請求項３に記載の車輪駆動装置。
          The wheel drive device according to claim 3, wherein the projecting portion is an axial press of a bearing incorporated in the outer pin assembly hole.
PCT/JP2014/068536 2013-07-17 2014-07-11 In-wheel motor driving device WO2015008702A1 (en)

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JP2013148248A JP2015021525A (en) 2013-07-17 2013-07-17 In-wheel motor drive unit

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CN110149021A (en) * 2018-02-12 2019-08-20 比亚迪股份有限公司 Electronic assembly and vehicle with it
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CN110149020A (en) * 2018-02-12 2019-08-20 比亚迪股份有限公司 Electronic assembly and vehicle with it
CN112815077A (en) * 2021-03-31 2021-05-18 重庆长安汽车股份有限公司 Oil return path structure of hybrid transmission box
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US12021434B2 (en) 2018-02-12 2024-06-25 Byd Company Limited Electric assembly and vehicle having the same
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