JP4799199B2 - In-wheel motor drive device - Google Patents

Description

The present invention relates to in-wheel motor drive device coupled coaxially to the rotary shaft and the car Waha blanking of the electric motor via a reduction gear.

  A conventional in-wheel motor drive device is described in, for example, Japanese Patent Application Laid-Open No. 2005-7914 (Patent Document 1). The in-wheel motor drive device described in the publication includes a motor that generates a driving force, a wheel hub that connects a tire, and a deceleration that decelerates the rotation of the motor and transmits it to the tire between the motor and the wheel hub. Equipped with a machine. This reduction gear employs a parallel shaft gear mechanism formed by combining a plurality of gears having different numbers of teeth.

Such electric motor-wheel motor drive devices coupled via a reduction gear and an output shaft and a drive Waha blanking of, because large-scale power transmission mechanism such as a propeller shaft or differential becomes unnecessary, weight reduction of the vehicle It is attracting attention from the viewpoint of compactness. However, the in-wheel motor drive device attached to the unsprung portion of the vehicle has a drawback that the ride comfort becomes worse due to the increase of the unsprung weight, and has not yet been put into practical use.

  The output torque of the electric motor and the motor volume (weight) are almost proportional, and in order to obtain a large output sufficient to drive the wheels of the vehicle with a small motor volume, high-speed rotation is inevitable. It is necessary to incorporate a reduction gear between the output shaft and the hub. For this reason, since the weight of the speed reducer to be incorporated is meaningless, the in-wheel motor drive device is required to have a compact speed reduction mechanism capable of obtaining a large speed reduction ratio and a compact arrangement structure of the speed reduction mechanism.

Further, as for an electric vehicle deceleration device, there is one incorporating planetary reduction gear as the reduction gear between the output shaft and the car Waha blanking of the electric motor (for example, see Patent Document 2). Although what is described in Patent Document 2 is not an in-wheel motor drive device in which the electric motor and the speed reducer are mounted under the spring, the planetary gear speed reducer is provided in two stages, and the second stage planetary gear speed reducer The output is distributed to the left and right unsprung wheels via the drive shaft.
JP 2005-7914 A Japanese Patent Laid-Open No. 5-332401 (Fig. 1-3)

  The reduction ratios of the parallel shaft gear mechanism and the planetary gear mechanism employed in the reduction gears described in the above publications are 1/2 to 1/3 for the former and 1/3 for the latter from the viewpoint of gear strength and the like. Generally, it is set to about １ ／. This is insufficient as a reduction ratio of a reduction gear mounted on the in-wheel motor drive device, and the reduction gear needs to have a multistage configuration in order to obtain a sufficient reduction ratio. This leads to an increase in the weight and size of the speed reducer, and is inappropriate for an in-wheel motor drive device that needs to be made compact.

  Further, the planetary gear reducer described in Patent Document 2 can obtain a large reduction ratio as compared with the parallel shaft gear. There is a problem that the number of parts is large and it is difficult to make it compact.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an in-wheel motor drive device having a compact reduction mechanism that can obtain a large reduction ratio and a compact arrangement structure of the reduction mechanism.

  In order to solve the above-described problems, an in-wheel motor drive device according to the present invention is an in-wheel motor drive device in which a reduction mechanism is interposed between an electric motor and a wheel bearing of a vehicle, and an output portion of the electric motor. The eccentric part of the cycloid reduction mechanism is formed on the curved part, and a curved plate is attached to the eccentric part, and the eccentric movement of the curved plate is transmitted to the wheel bearing as a rotational movement.

  That is, the speed reducer is a cyclo speed reducer that transmits the eccentric motion of the curved plate attached to the eccentric portion of the output shaft of the electric motor to the hub as a rotational motion, and the speed reduction mechanism capable of obtaining a compact and large reduction ratio and An in-wheel motor drive device having a compact arrangement structure of the speed reduction mechanism can be provided.

Sa Micro speed reducer, the outer eccentric motion of the curved plate formed by the trochoid-based curve of gentle wavy, as well as guided by a plurality of outer pins fixed concentrically on the outer circumference, is transferred to rotary motion output A plurality of inner pins attached concentrically to the member are fitted into and engaged with a plurality of through holes provided concentrically inside the curved plate, and the eccentric movement of the curved plate is caused by the engagement of the inner pins and the through holes. It is transmitted to the output member as a rotational motion, can be designed compactly with a small number of parts, and a large reduction ratio of 1/10 or more can be obtained in one stage.

The curve plate and a plurality mounted, these plurality of curved plates by mounting in phase to cancel the eccentric motion to each other, it is possible to suppress the vibration caused by the eccentric motion of the curved plates.

The output shaft of the electric dynamic motor, by mounting the counterweight in phase to cancel the eccentric motion of the curved plates, it is possible to suppress the vibration around the center of gravity caused by the eccentric motion of the curved plates.

Fitted with a plurality of external pins, a bearing and a plurality of inner pins engaged interpolation factor fitted into a plurality of through holes provided in the interior of the curve plate for guiding the outer periphery of the curved plates of Sa Micro reducer, these bearings the outer ring, by rolling contact therewith respectively and the outer circumference of the curve plate and the inner periphery of the through holes, the contact resistance between the outer periphery of the outer pins and curved plate, and the contact resistance between the inner circumference of the inner pin and the through hole The eccentric motion of the curved plate can be smoothly transmitted to the hub as a rotational motion.

  The above-described in-wheel motor drive device is suitable for an electric vehicle.

An in-wheel motor drive device according to the present invention includes a wheel hub that is fixed to a vehicle wheel, an outer peripheral surface that opposes an outer peripheral surface of the wheel hub, and is connected to a vehicle body of the vehicle. A wheel hub bearing portion having a double row rolling element that rolls between the motor hub , a motor portion that rotationally drives a rotating shaft that is coaxial with the wheel hub, and a rotational speed of the rotating shaft is reduced and transmitted to the wheel hub Ru and a deceleration section. The rotating shaft has an eccentric part. The deceleration unit is rotatably held by the eccentric portion, and the revolving member for revolving motion around its rotation axis with the rotation of the rotary shaft, is fixedly connected to the outer ring, the outer peripheral portion of the revolving member And an outer peripheral engagement member that causes rotation of the revolving member, a hole formed in the revolving member, an inner pin received in the hole, and a connecting member that connects the inner pin and the wheel hub. Here, the rotation motion of the revolution member is converted into the rotation motion around the rotation axis of the inner pin engaged with the hole, and the rotation motion of the inner pin is transmitted to the wheel hub via the connecting member. . Specifically, it is preferable that the revolution member has a plurality of corrugations on its outer peripheral portion, and the outer periphery engagement member has a plurality of outer pins arranged on the revolution track of the revolution member.

  Since the speed reduction part which has the said structure is compact and a high reduction ratio is obtained, a motor part can be reduced in size and weight. As a result, it is possible to obtain an in-wheel motor drive device that is lightweight and can supply sufficient torque to the drive wheels.

Preferably, the outer pin includes a rolling bearing that comes into contact with the outer peripheral portion of the revolution member. Thus, it is possible to reduce the contact resistance between the revolving member and the outer pins, Ru can improve the transmission efficiency of the deceleration portion.

Preferably, the eccentric part of the rotating shaft includes a first eccentric part and a second eccentric part arranged in a phase where the centrifugal forces due to the eccentric motion cancel each other, and the revolving member is rotatable to the first eccentric part. And a second revolving member having the same outer peripheral shape as the first revolving member and rotatably held by the second eccentric portion.

  The eccentric part generates an eccentric centrifugal force during rotation. Therefore, for example, by arranging the first eccentric part and the second eccentric part with a phase difference of 180 °, the first revolving member and the second revolving member cancel each other's centrifugal force. The vibration of the apparatus can be suppressed.

Preferably, a counterweight attached to the rotating shaft at a phase that cancels out the moment of inertia due to the eccentric motion of the revolving member is further provided. The eccentric portion generates a moment of inertia together with the eccentric centrifugal force. Therefore, the vibration of the in-wheel motor drive device can be suppressed by arranging the counterweight at a phase that cancels the moment of inertia of the revolving member.

Motion conversion mechanism for converting the rotation motion of the revolution member to the rotation movement of the wheel hub, for example, a pin inner provided on one of the revolving member and the coupling member, is formed on the other of the revolving member and the connecting member, diameter by a predetermined portion than the outer diameter of the inner pin and a bore for receiving the inner pin is large. For example, the hole is provided in the revolving member, and the inner pin is held by the connecting member. By setting it as the motion conversion mechanism of the said structure, the rotation motion of a revolution member can be transmitted to a wheel hub .

Preferably, a plurality of holes are provided on a circumferential track centering on the rotation axis of the revolution member, and a plurality of inner pins are provided on a circumferential track centering on the rotation axis of the wheel hub . . This speed reduction part can be composed of one hole and one inner pin from the viewpoint of the operating principle. However, since the wall surface of the hole and the inner pin rotate while repeating a contact state and a non-contact state, the driving force of the motor unit is smoothly transmitted to the wheel hub by providing a plurality of holes and a plurality of inner pins. It becomes possible.

  Preferably, the inner pin includes a rolling bearing that contacts the wall surface of the hole. Thereby, since the contact resistance of the revolution member and inner pin at the time of rotation can be reduced, the transmission efficiency of a deceleration part can be improved.

Preferably , rolling elements are arranged in a double row between the wheel hub and the outer ring . As a result, the wheel hub can be more stably and rotatably supported with respect to the in-wheel motor drive device.

In-wheel motor drive device of the present invention, a reduction gear for connecting the car Waha blanking the output shaft and the vehicle of the electric motor, as rotational motion eccentric motion of the curve plates mounted on the eccentric portion of the output shaft of the electric motor Since the cyclo reducer is transmitted to the hub, it can be made compact and a large reduction ratio can be obtained.

The curve plate and a plurality mounted, these plurality of curved plates by mounting in phase to cancel the eccentric motion to each other, it is possible to suppress the vibration caused by the eccentric motion of the curved plates.

The output shaft of the electric dynamic motor, by mounting the counterweight in phase to cancel the eccentric motion of the curved plates, it is possible to suppress the vibration around the center of gravity caused by the eccentric motion of the curved plates.

A plurality of outer pins to guide the outer periphery of the curved plates of Sa Micro reducer, a bearing fitted into a plurality of inner pins engaged interpolation factor fitted into a plurality of through holes provided in the interior of the curved plates, these bearings By rolling the outer ring to the outer periphery of each curved plate and the inner periphery of each through hole, the contact resistance between the outer pin and the outer periphery of the curved plate, and the contact resistance between the inner pin and the inner periphery of the through hole are reduced. The eccentric motion of the curved plate can be smoothly transmitted to the hub as a rotational motion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The in-wheel motor drive unit is intended for electric vehicles, as shown in FIG. 1 (a), the rotary shaft 2 of the electric motor 1, the through Cyclo Drive 11 cars Waha Bed 21 coaxially It is connected.

Electrostatic dynamic motor 1, between the stator 3 fixed to the axial gap provided in the casing 1a, is prepared by attaching the rotor 4 to the rotary shaft 2. One end side of the rotary shaft 2 is supported by the casing 1a by the bearing 5, and the other end side inserted through the casing 11a of the cyclo reducer 11 is supported by the center hole of the wheel hub 21 by the bearing 6, and is inserted into the casing 11a. Two eccentric portions 2a and 2b are arranged in the axial direction in the portion thus formed.

Sa Micro reducer 11, as shown in FIG. 2, two curved plates 12a outer shape is formed by the trochoid-based curve of gentle wavy, 12b, and the eccentric portions of the rotating shaft 2 via respective bearings 13 2a, 2b, and the eccentric movement is guided by a plurality of outer pins 14 concentrically fixed to the casing 11a on the outer peripheral side, and a plurality of inner pins 16 attached concentrically to the connecting member 15 are provided. The curved plates 12a and 12b are fitted into and engaged with a plurality of through holes 17 provided concentrically within the curved plates 12a and 12b, and the eccentric movement of the curved plates 12a and 12b is caused by the engagement of the inner pins 16 and the through holes 17. It is transmitted to the connecting member 15 as a rotational motion.

As shown in FIG. 1B , the two curved plates 12a and 12b are attached to the eccentric portions 2a and 2b with a phase difference of 180 ° so that the eccentric motions are canceled. Further, as shown in FIG. 1 (b), the rotary shafts 2 on both sides of the eccentric parts 2a and 2b have the eccentric parts 2a and 2b so as to cancel vibrations caused by the eccentric movements of the curved plates 12a and 12b. A counterweight 18 is mounted on the opposite side to the eccentric direction, and the center point between the two curved plates 12a and 12b is G, and the distance between the central point G and the center of each curved plate 12a and 12b is L1, and the central point. Assuming that the distance between G and each counterweight 18 is L2, the mass of the curved plates 12a and 12b is m1, the mass of the counterweight 18 is m2, and their eccentric amounts are ε1 and ε2, respectively, L1 × m1 × ε1 = The relationship satisfies L2 × m2 × ε2.

As shown in FIG. 3, the inner pin 16 and the respective outer pin 14, needle roller bearings 19 and 20 is fitted, their outer rings 19a, 20a, respectively, each with an outer periphery of the curved plates 12a, 12b It comes into rolling contact with the inner periphery of the through hole 17. Therefore, the contact resistance between the outer pin 14 and the outer periphery of each curved plate 12a, 12b and the contact resistance between the inner pin 16 and the inner periphery of each through hole 17 are reduced, and the eccentric motion of each curved plate 12a, 12b is rotated. The movement can be smoothly transmitted to the connecting member 15.

As shown in FIG. 1A, the wheel hub 21 has a cylindrical portion 21a connected to the connecting member 15 of the cyclo reducer 11 with a bolt 22 and a flange portion 21b connected to the wheel with a bolt 23. To do. Then, a fitted over the inner ring 24 the cylindrical portion 21a and the cylindrical portion 21a, an outer ring 26 which is bolted 25 to the casing 11a of the cyclo speed reducer 11, the array of ball 27. in two rows between these The wheel hub bearing portion is configured . This wheel hub bearing unit, the wheel hub 21 is rotatably supported by the vehicle body, the rotational motion of the connecting member 15, Ru is transmitted to the wheels. It should be noted that the center hole of the wheel hub 21 which supports the front end side of the rotating shaft 2 in bearing 6, the seal member 28 for sealing the Cyclo Drive 11 side are attached.

In the above-described embodiment, two curved plates 12a and 12b of the cyclo reducer 11 are provided with an eccentric phase of 180 °. However, the number of the curved plates can be arbitrarily set, for example, three curved plates. In the case of providing, an eccentric phase of 120 ° may be used.

  Hereinafter, although it may partially overlap with the above description, the in-wheel motor drive device according to the embodiment of the present invention will be described again in detail with reference to FIGS.

  The in-wheel motor drive device shown in FIG. 1 includes a motor part A that generates a driving force, a speed reduction part B that decelerates and outputs the rotation of the motor part A, and a wheel that transmits the output from the speed reduction part B to the wheel wheel 29. A hub bearing portion C is provided, and the motor portion A and the speed reduction portion B are accommodated in a casing.

  The motor unit A includes a rotating shaft 2, a rotor 4 that fits and rotates integrally with the rotating shaft 2, and a stator 3 that is fixed to the casing 1 a with a gap in the axial direction. An axial gap motor provided.

The rotating shaft 2 is arranged from the motor part A to the speed reduction part B in order to transmit the driving force of the motor part A to the speed reduction part B, and has eccentric parts 2a and 2b in the speed reduction part B. The rotating shaft 2 is supported by bearings 5 and 6 at both ends of the motor part A and the left end of the speed reducing part B. Further, the two eccentric portions 2a and 2b are provided with a phase difference of 180 ° in order to cancel the centrifugal force caused by the eccentric motion.

The deceleration part B is a curved plate 12a, 12b as a revolving member supported rotatably by the eccentric parts 2a, 2b, and an outer peripheral engagement member fixed to the casing 11a and engaged with the outer peripheral part of the curved plates 12a, 12b. A plurality of outer pins 14, a motion conversion mechanism for transmitting the rotational motion of the curved plates 12 a and 12 b to the wheel hub 21 , and a counterweight 18.

  The curved plate 12a has a plurality of waveforms composed of a trochoid curve such as epitrochoid on the outer peripheral portion, and a plurality of through holes 17 penetrating from one end surface to the other end surface have the rotation axis of the curved plate 12a. It is provided at equal intervals on a circumferential track that is the center. The curved plate 12b has the same shape as the curved plate 12a.

The outer pins 14 are provided at equal intervals on a circumferential track centering on the rotation axis of the rotation shaft 2. This coincides with the revolution trajectory of the curved plates 12a and 12b, and when the curved plates 12a and 12b revolve, the curved waveform and the outer pin 14 engage with each other, causing the curved plates 12a and 12b to rotate. Let Further, in order to reduce the contact resistance between the curved plates 12a, 12b and the outer pin 14, curved plates 12a, such that the outer peripheral surface abutting the 12b, needle roller bearings 1 9 out pin 14 is fitted Tei Ru.

  The counterweight 18 has a disc shape and has a through hole that fits with the rotary shaft 2 at a position off the center. In order to cancel the moment of inertia caused by the rotation of the curved plates 12a and 12b, the counterweights 2a, It is arranged on the outer side of 2b while changing the phase of the eccentric part and 180 °.

Motion converting mechanism includes a plurality of inner pins 16 held by the connecting member 15, curved plates 12a, and a through hole 17 provided in 12b. The inner pins 16 are provided at equal intervals on a circumferential track centering on the rotational axis of the connecting member 15. Further, in order to reduce the contact resistance with the curved plates 12a and 12b , the needle roller bearing 20 is provided at a position in contact with the inner wall surface of the through hole 17 of the curved plates 12a and 12b.

That is, the rotation of the rotating shaft 2 driven by the electric motor 1 is decelerated by the decelerating unit including the motion conversion mechanism and is output as the decelerated rotation of the wheel hub 21.

The wheel hub bearing portion C rotatably supports the wheel hub 21, and is opposed to the outer ring 26 in which two rows of outer ring raceway surfaces are formed on the inner peripheral surface with a space therebetween, and to each outer ring raceway surface. As described above, the wheel hub 21 in which the inner ring raceway surface is formed on the outer circumference and the separate inner ring 24 installed on the outer circumference, and the rolling elements arranged in a double row between the outer ring raceway surface and the inner ring raceway surface. The plurality of balls 27 and a cage (not shown) for holding the balls 27 at equal intervals. Further, the wheel hub 21 has a flange portion 21b formed near the opposite end of the speed reduction portion B for use in attaching the wheel wheel 29, and in order to prevent dust from entering the speed reduction portion B, etc. sealing member 28 on the inner diameter side, it is set vignetting. One end of the wheel hub 21 is fixed to the connecting member 15 by a bolt 22, and the flange portion 21 b is fixed to the wheel wheel 29 by a bolt 23. The outer ring 26 or a portion of the casing 11a on the outer ring 26 side is fixed to a knuckle (not shown).

  The operation principle of the in-wheel motor drive device having the above configuration will be described in detail.

  The motor unit A receives, for example, electromagnetic force generated by supplying an alternating current to the coil of the stator 3 from the outside, and the rotor 4 configured by a permanent magnet or a direct current electromagnet rotates. At this time, the rotor 4 rotates at a higher speed as a high-frequency voltage is applied to the coil.

As a result, when the rotary shaft 2 connected to the rotor 4 rotates, the curved plates 12 a and 12 b revolve around the rotational axis of the rotary shaft 2. At this time, the outer pin 14 is engaged with the curved waveform of the curved plates 12a and 12b, and the curved plates 12a and 12b rotate in a direction opposite to the rotation of the rotary shaft 2. If it does so, the inner pin 16 provided so that it may join to the inner wall of the through-hole 17 of the curve boards 12a and 12b will be pushed by the inner wall of the through-hole 17. FIG . Thereby, the connecting member 15 that holds the inner pin 16 rotates. Here, the diameter of the through-hole 17 is set larger than the outer diameter (maximum outer diameter including the outer ring 20a of the needle bearing 20) of the inner pin 16, only the differences between the above diameters, the inner pin 16 On the other hand, the curved plates 12a and 12b can move . The difference in these diameters, curved plates 12a, 12b revolution or, dimensional error between the members, and be absorbed. Therefore, the rotation transmitted from the curved plates 12a and 12b to the connecting member 15 is transmitted only by the rotation corresponding to the rotational motion of the curved plates 12a and 12b, and the rotation corresponding to the revolution motion of the curved plates 12a and 12b is blocked. Is done. Then, the rotation of the connecting member 15 is transmitted to the wheel hub bearing portion C.

  At this time, since the rotation of the rotating shaft 2 is decelerated by the deceleration unit B and transmitted to the connecting member 15, even when the low torque, high rotation type motor unit A is adopted, the necessary torque is applied to the wheel wheel 29. It is possible to communicate.

Note that the reduction ratio of the speed reduction unit B having the above-described configuration is calculated as (Z _A −Z _B ) / Z _B where Z _{A is} the number of outer pins 14 and Z _B is the number of waveforms of the curved plates 12a and 12b. The In the embodiment shown in FIG. 2, since Z _A = 12 and Z _B = 11, the reduction ratio is 1/11, and a very large reduction ratio can be obtained.

Thus, in the present invention, a compact and high reduction ratio in-wheel motor drive device can be obtained by adopting the reduction part B that can obtain a large reduction ratio without using a multistage configuration. Further, the curved plates 12a, 12b and the outer pins 14 and the inner pin 16 abuts, by providing the needle roller bearings 19 and 20, it is possible to reduce the contact resistance. Thus, Ru can improve the transmission efficiency of the deceleration section B.

The above description of the operation has been made by paying attention to the rotation of each member, but in reality, power including torque is transmitted from the electric motor 1 to the wheel wheel 29. Therefore, the power decelerated as described above is converted into high torque.

  In the above description of the operation, power is supplied to the electric motor 1 to drive the electric motor 1 and the power from the electric motor 1 is transmitted to the wheel wheel 29. Conversely, the vehicle decelerates. When driving down or going down a hill, the power from the wheel / wheel 29 side may be converted into high-rotation / low-torque rotation by the speed reducer B and transmitted to the electric motor 1, and the electric motor 1 may generate power. . Furthermore, the electric power generated here may be stored in a battery and used later for driving the electric motor 1 or for operating other electric devices provided in the vehicle.

  Furthermore, a brake can be added to the configuration of the above-described embodiment. For example, in the configuration of FIG. 1, the casing 1 a is extended to the right side (axial direction) in the drawing so that a space is formed on the right side of the rotor 4 in the drawing, and a rotating member and casing that rotate integrally with the rotor 4. This is a parking brake in which a piston that is non-rotatable and movable in the axial direction and a cylinder that operates the piston are arranged in 1a and the rotor 4 is locked by engaging the piston and the rotating member when the vehicle is stopped. May be.

  Alternatively, it may be a disc brake in which a flange formed on a part of a rotating member that rotates integrally with the rotor 4 and a friction plate installed on the casing 1a side are sandwiched by a cylinder installed on the casing 1a side. Further, it is possible to use a drum brake in which a drum is formed on a part of the rotating member, a brake shoe is fixed to the casing 1a side, and the rotating member is locked by friction engagement and self-engagement.

  By the way, the outer diameter dimension of the inner pin 16 is smaller than the inner diameter dimension of the through hole 17, and the inner pin 16 and the inner peripheral surface of the through hole 17 rotate while repeating a contact state and a non-contact state. From the viewpoint of smoothly transmitting the rotation to the wheel wheel 29, it is desirable to provide a plurality of inner pins 16 at equal intervals.

  By employing the in-wheel motor drive device according to the above embodiment in the electric vehicle 31, the unsprung weight can be suppressed. As a result, an electric vehicle with excellent running stability can be obtained.

  In the above-described embodiment, two curved plates 12a and 12b of the deceleration unit B are provided with 180 ° phase shifts. However, the number of the curved plates can be arbitrarily set, for example, three curved plates are provided. In such a case, it is preferable to change the 120 ° phase. Further, since it is necessary to provide the same number of counter weights as the curved plates, when three curved plates are provided, it is necessary to provide three counter weights by changing the phase of each curved plate by 180 °.

Moreover, although the motion conversion mechanism in said embodiment showed the example which has the inner pin 16 fixed to the connection member 15, and the through-hole 17 provided in curve board 12a, 12b, it does not restrict to this. The rotation of the speed reduction unit B can be arbitrarily configured to be transmitted to the wheel hub 21. For example, a motion conversion mechanism including an inner pin fixed to a curved plate and a hole formed in the connecting member 15 may be used.

  Further, in the above embodiment, the example in which the bearings provided on the outer pin 14 and the inner pin 16 are needle roller bearings 19 and 20 has been shown from the viewpoint of reducing the radial thickness, but the present invention is not limited thereto. For example, cylindrical roller bearings, tapered roller bearings, angular contact ball bearings, 4-point contact ball bearings, self-aligning roller bearings, etc., regardless of whether the rolling elements are rollers or balls, apply all types of rolling bearings can do.

In the above-described embodiment, the electric motor is provided with an axial gap between the stator and the rotor. However, the electric motor may be of any type such as a radial gap provided between the stator and the rotor. Can be adopted. Furthermore, the car Waha Bed also not be limited to the above embodiment, it is possible to employ any types.

  The present invention can be applied not only to electric vehicles but also to all vehicles that obtain driving force from electric power, and can also be applied to, for example, hybrid cars.

  Furthermore, although the example of the rotating shaft 2 was shown as an output member which transmits rotation of the motor part A to the deceleration part B in embodiment mentioned above, it can be set as arbitrary shapes, without restricting to this. For example, it may be a flange-shaped output member in which a rotating shaft and a rotor are integrated.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

(A) shows the longitudinal cross-sectional view which shows embodiment of an in-wheel motor drive device, (b) shows the expanded sectional view which expanded the principal part of (a) . Sectional drawing along the II-II line | wire of FIG. 1 is shown. The expanded sectional view which expands and shows the principal part of FIG .

DESCRIPTION OF SYMBOLS 1 Electric motor, 1a , 11a casing, 2 Rotating shaft, 2a, 2b Eccentric part, 3 Stator, 4 Rotor, 5 , 6 , 13, Bearing, 11 Cyclo reducer, 12a, 12b Curved plate, 14 Outer pin, 15 Connection Member, 16 inner pin, 17 through hole, 18 counter weight, 19, 20 needle roller bearing, 19a, 20a outer ring, 21 wheel hub, 21a cylinder part, 21b flange part, 22 , 23 , 25 bolt, 24 inner ring, 26 Outer ring, 27 balls, 28 sealing member, 29 wheel.

Claims (7)

A wheel hub fixed to a wheel of a vehicle, an inner peripheral surface facing an outer peripheral surface of the wheel hub, an outer ring connected to a vehicle body of the vehicle, and a double row rolling between the wheel hub and the outer ring A wheel hub bearing having rolling elements of
A motor unit for rotationally driving a rotating shaft located coaxially with the wheel hub ;
And a speed reduction unit for transmitting to the wheel hub by decelerating the rotation of said rotary shaft,
The rotating shaft has an eccentric part,
The deceleration part is
Is rotatably held by the eccentric portion, and the revolving member for revolving motion around its rotation axis with the rotation of said rotary shaft,
An outer peripheral engagement member fixedly connected to the outer ring, and engaged with an outer peripheral portion of the revolving member to cause rotation of the revolving member;
A hole formed in the revolving member;
An inner pin received in the hole;
A connecting member that connects the inner pin and the wheel hub,
The rotation movement of the revolving member is converted into the rotation movement around the rotation axis of the inner pin engaged with the hole, and the rotation movement of the inner pin is transferred to the wheel hub via the connecting member. An in-wheel motor drive device to be transmitted . The revolving member has a plurality of corrugations on its outer periphery,
2. The in-wheel motor drive device according to claim 1 , wherein the outer peripheral engagement member includes a plurality of outer pins arranged on a revolution track of the revolution member. The in-wheel motor drive device according to claim 2 , wherein the outer pin includes a rolling bearing that abuts on an outer peripheral portion of the revolving member. The eccentric part of the rotating shaft is
A first eccentric portion arranged in a phase that cancels out centrifugal forces due to eccentric motion, and a second eccentric portion,
The revolving member is
A first revolving member rotatably held by the first eccentric portion;
The in-wheel motor drive device in any one of Claims 1-3 including the 2nd revolution member which has the same outer periphery shape as the said 1st revolution member, and was rotatably hold | maintained at the said 2nd eccentric part. . The in-wheel motor drive device in any one of Claims 1-4 further equipped with the counterweight with which the said rotating shaft was mounted | worn with the phase which cancels the moment of inertia by the eccentric motion of the said revolution member. Said hole has a plurality provided in the circumferential orbit around the rotation axis of the revolving member,
The in-wheel motor drive device according to any one of claims 1 to 5 , wherein a plurality of the inner pins are provided on a circumferential track centering on a rotation axis of the wheel hub . It said pin comprises a rolling bearing contacts the wall surface of the hole, in-wheel motor drive device according to any one of claims 1 to 6.

Images