JP2018003978A - Unit for wheel driving - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a structure capable of supplying power to a sensor installed on a wheel according to power consumption, and further easily installing a non-contact transmission device having a size necessary for the supply of power.SOLUTION: In the vicinity of a differential side constant velocity joint 1 and a differential gear 24, a non-contact transmission device 4 capable of transmitting power and a signal in a non-contact manner is installed. A power wire 42 and a signal wire 43, which are connected to the non-contact transmission device 4, are inserted in an axial direction onto a radial inside of the differential side constant velocity joint 1, a radial inside of a transmission shaft 2 and a radial inside of a wheel side constant velocity joint 3. Then, the power wire 42 and the signal wire 43 are connected to a sensor installed on a wheel.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wheel drive unit that includes a differential-side constant velocity joint and a transmission shaft, and is used to transmit a rotational driving force applied to a wheel of an automobile.

  In recent years, various physical quantities (tire pressure, load load, temperature, etc.) have been measured on rotating members located near road surfaces, such as wheels (tires and wheels), in order to improve motor performance and safety performance of automobiles. The development of a system for installing various sensors and executing various vehicle controls using physical quantities measured by the sensors is in progress.

  For example, in order to operate a sensor installed on a wheel, it is necessary to supply electric power to the sensor. However, since the wheel is a rotating body, there is a restriction on a structure that can be adopted for electric power supply. For example, a slip ring used for supplying electric power to a general rotating object is difficult to ensure a life required by wear generated at a contact point, and is not suitable for use on a wheel that rotates at high speed.

  On the other hand, a non-contact transmission device that transmits electric power in a non-contact manner using electromagnetic induction or the like has an advantage that it is easy to ensure a life because it does not have a contact that causes wear. Patent Document 1 discloses a structure in which such a non-contact transmission device is installed in a portion between a fixed ring (outer ring) and a rotating ring (hub) constituting a wheel support rolling bearing unit.

However, such a conventional structure has the following problems.
In other words, in order to supply the sensor installed on the wheel with the power corresponding to the power consumption, the size of the non-contact transmission device (the coil incorporated in the stationary transmission unit and the rotation transmission unit) is to some extent. It needs to be bigger. On the other hand, the space between the fixed and rotating wheels that make up the wheel bearing rolling bearing unit has a small space (the degree of freedom in design to secure the space), so the required size is not It tends to be difficult to install a contact transmission device.

Japanese Patent No. 5085173

  In view of the circumstances as described above, the present invention can supply electric power of a magnitude corresponding to power consumption to an electronic device such as a sensor installed on a rotating member such as a wheel, and is necessary for that purpose. The invention was invented to realize a structure in which a non-contact transmission device of a large size can be easily installed.

The wheel drive unit of the present invention includes a differential side constant velocity joint and a transmission shaft.
The differential side constant velocity joint includes a differential side input part coupled to the output part of the differential gear, and a differential side output part coupled to one axial end part of the transmission shaft.
In particular, the wheel drive unit of the present invention includes a non-contact transmission device and power wiring.
The non-contact transmission device includes a rotation-side transmission unit supported on the differential-side constant velocity joint directly or via another member (for example, on the outer diameter side of the differential-side constant velocity joint), and the rotation-side transmission unit. And a stationary transmission unit that is supported by a portion that does not rotate during use, and power transmission between the stationary transmission unit and the rotational transmission unit is non-contact (for example, electromagnetic). It has a function to perform).
The power wiring is connected to the rotation-side transmission unit.
The power wiring is inserted in the axial direction on the radially inner side of the transmission shaft.

  When the wheel driving unit of the present invention is implemented, as an additional configuration, the non-contact transmission device is configured to perform non-contact transmission of signals between the stationary transmission unit and the rotation transmission unit (for example, It can have a function to be performed (by electromagnetic induction). At the same time, a signal line can be connected to the rotation-side transmission unit, and the signal line can be inserted in the radial direction inside the transmission shaft in the axial direction.

In the case of carrying out the present invention, for example, the rotation-side transmission unit and the stationary-side transmission unit constituting the non-contact transmission device are rolling bearings for rotatably supporting the output unit of the differential gear with respect to the case. It can be installed on the outer side in the axial direction (outer side in the vehicle width direction) than (differential side bearing).
If such a configuration is adopted, a vehicle-side power wiring (or a vehicle-side signal wiring) that connects a power supply source (or a computing unit for signal processing) installed on the vehicle body side to the stationary transmission unit. ) Is easy to handle and maintain.
Further, in this case, for example, the rotation-side transmission portion can be supported and fixed to the inner ring constituting the rolling bearing, and the stationary-side transmission portion can be supported and fixed to the outer ring constituting the rolling bearing. .
If such a configuration is adopted, the rolling bearing and the non-contact transmission device can be handled integrally, so that the assemblability can be improved and the positional relationship between the rotation side transmission unit and the stationary side transmission unit is appropriate. It becomes easy to regulate.

When the wheel driving unit according to the present invention is implemented, for example, a wheel side constant velocity joint may be further provided as in the invention described in claim 2. The wheel side constant velocity joint is inserted into the hub in a state where the wheel side input portion coupled to the other axial end portion of the transmission shaft and the radially inner side of the hub constituting the wheel supporting rolling bearing unit are inserted. And a wheel side output unit to be coupled. And the said electric power wiring penetrated to the radial direction inner side of the said transmission shaft to an axial direction can be penetrated to the radial direction inner side of the said wheel side constant velocity joint to an axial direction.
In this case, when the above-described additional configuration is adopted, the signal wiring inserted in the axial direction on the radial inner side of the transmission shaft is inserted in the axial direction on the radial inner side of the wheel side constant velocity joint. I can do it.

The wheel support rolling bearing unit is for rotatably supporting wheels (tires and wheels) with respect to the suspension device, and includes, for example, an outer ring, a hub, and a plurality of rolling elements. Yes.
Of these, the outer ring has a double-row outer ring raceway on the inner peripheral surface, and does not rotate in a state of being coupled to the suspension device when in use.
The hub is configured by combining, for example, a hub body and an inner ring. The hub has a double-row inner ring raceway on the outer peripheral surface, and rotates together with the wheel while the wheel is supported and fixed during use.
In addition, a plurality of rolling elements (for example, balls and tapered rollers) are provided between the outer ring raceways and the inner ring raceways so as to be capable of rolling plurally in both rows.

In the case of the wheel drive unit of the present invention configured as described above, it is possible to supply electric power having a size corresponding to the power consumption to electronic devices such as sensors installed on rotating members such as wheels, In addition, it is possible to easily install a non-contact transmission device of a size necessary for that purpose.
That is, in the case of the present invention, the power wiring connected to the rotation-side transmission unit constituting the non-contact transmission device and inserted radially inward of the transmission shaft in the axial direction is connected to the transmission shaft or the wheel side. By connecting to electronic devices such as sensors installed on constant velocity joints, wheel bearing rolling bearing units, and rotating members such as wheels, the power sent from the vehicle body side can be transmitted to the non-contact transmission device and power It can supply to the said electronic device via wiring for work.
In the case of the present invention, the rotation-side transmission unit of the rotation-side transmission unit and the stationary-side transmission unit constituting the non-contact transmission device is supported directly or via another member on the differential-side constant velocity joint, The stationary side transmission unit is disposed close to the rotation side transmission unit and is supported by a portion that does not rotate during use. That is, in the case of the present invention, the installation location of the non-contact transmission device is the peripheral portion of the differential side constant velocity joint. The peripheral portion of the differential-side constant velocity joint has a larger spatial margin than the peripheral portion of the wheel support rolling bearing unit, which is the installation location of the above-described contactless transmission device having the conventional structure. For this reason, in the case of this invention, the non-contact transmission apparatus of a required size can be installed easily.

Sectional drawing which shows the unit for wheel drive of the 1st example of embodiment of this invention. The enlarged view equivalent to the A section of FIG. 1 regarding the 2nd example of embodiment of this invention. FIG. 3 is a half sectional view showing a part of FIG. 2 taken out. Sectional drawing which shows the unit for wheel drive of the 3rd example of embodiment of this invention.

[First example of embodiment]
A first example of the embodiment of the present invention will be described with reference to FIG.
The wheel driving unit of this example includes a differential side constant velocity joint 1, a transmission shaft 2, a wheel side constant velocity joint 3, a non-contact transmission device 4, a power wiring 42, and a signal wiring 43. .
In the following description of this example, unless otherwise specified, “inside” with respect to the axial direction means the right side of each figure which is the inner side in the vehicle width direction when assembled to the automobile, and conversely, in the vehicle width direction. The left side of each figure on the outside is called “outside” in the axial direction.

  The differential side constant velocity joint 1 includes a joint housing 5, a tripod 6, and three rollers 7, 7, as in a conventionally known tripod type constant velocity joint.

  The joint housing 5 is made in the shape of a cup having a bottom 8 at the inner end in the axial direction, and the recesses 9, 9 are axially arranged at three positions at equal intervals in the circumferential direction on the inner peripheral surface. Is provided. In addition, an outer end portion in the axial direction of the input shaft 12 is fixed to a central portion in the radial direction of the inner side surface in the axial direction of the bottom portion 8. In the case of this example, a differential side through-hole 13 that opens only in the axially outer side surface of the bottom portion 8 is provided in the axial direction at the radial center portion of the bottom portion 8.

The tripod 6 includes a cylindrical base 10 and a columnar trunnion 11 provided in a radially extending state from three circumferentially spaced positions on the outer peripheral surface of the base 10. Have.
Each of the rollers 7 and 7 is supported rotatably around each trunnion 11 via a needle bearing (not shown). In this state, the rollers 7 and 7 are engaged with the recesses 9 and 9 on the inner peripheral surface of the joint housing 5, respectively.
In the case of this example, the input shaft 12 corresponds to the differential side input portion described in the claims, and the base portion 10 of the tripod 6 corresponds to the differential side output portion described in the claims. Equivalent to.

  The wheel side constant velocity joint 3 includes a joint outer ring 14, a joint inner ring 15, and a plurality of balls 16, 16 in the same manner as a conventionally known Zepper type or Barfield type constant velocity joint.

  The joint outer ring 14 is formed in a cup shape having a bottom portion 17 at the outer end in the axial direction, and outer engagement grooves 18 and 18 are provided at a plurality of positions in the circumferential direction on the inner peripheral surface. It is provided in the direction perpendicular to. In addition, an inner end portion in the axial direction of the output shaft 20 is fixed to a central portion in the radial direction of the outer surface in the axial direction of the bottom portion 17. In the case of this example, the wheel-side through hole 21 is provided in a state of passing through the output shaft 20 and the radial center portion of the bottom portion 17 in the axial direction.

The joint inner ring 15 is formed in a substantially cylindrical shape, and the inner engagement grooves 19 and 19 are arranged in the circumferential direction in the portion of the outer peripheral surface aligned with the outer engagement grooves 18 and 18, respectively. It is provided at a right angle.
Each of the balls 16, 16 is provided between the outer engagement grooves 18, 18 and the inner engagement grooves 19, 19, so as to roll along the engagement grooves 18, 19. It has been.
In the case of this example, the joint inner ring 15 corresponds to a wheel side input portion described in the claims, and the output shaft 20 corresponds to a wheel side output portion described in the claims.

  Further, the transmission shaft 2 is a hollow shaft made in a circular tube shape, and has a shaft through hole 22 opened at both axial ends on the radially inner side. Of such a transmission shaft 2, the inner end in the axial direction is engaged with the inner peripheral surface of the base 10 of the tripod 6, and the outer end in the axial direction is engaged with the inner peripheral surface of the inner ring 15 for joint, respectively. Etc., so that torque transmission is possible (coupled). Further, in this state, the joint housing 5 and the joint outer ring 14 are each made of an elastic material between the opening-side end outer peripheral surface and the axially opposite end outer peripheral surface of the transmission shaft 2. Cylindrical boots 23a, 23b having bellows at the middle are spanned to seal the openings of the joint housing 5 and the joint outer ring 14.

  The input shaft 12 of the differential-side constant velocity joint 1 is inserted into a case 25 that houses a differential gear 24. A cylindrical output portion 26 of the differential gear 24 is externally fitted (coupled) to the outer peripheral surface of the input shaft 12 in the axial direction so as to transmit torque by spline engagement or the like. The output part 26 of the differential gear 24 is rotatably supported by the case 25 by a rolling bearing (tapered roller bearing) 46 called a differential side bearing.

  The output shaft 20 of the wheel side constant velocity joint 3 is coupled to a hub 29 constituting a wheel support rolling bearing unit 27. The wheel support rolling bearing unit 27 includes an outer ring 28, a hub 29, and a plurality of rolling elements 30 and 30.

The outer ring 28 has double-row outer ring raceways 31a and 31b on the inner peripheral surface, and a stationary flange 32 for coupling and fixing to a knuckle constituting a suspension device on the outer peripheral surface.
The hub 29 is a combination of a hub body 33 and an inner ring 34, and is arranged on the radially inner side of the outer ring 28.

The hub body 33 includes a rotation-side flange 35 for supporting and fixing a wheel and a brake rotating member on a portion near the outer end in the axial direction that protrudes from the outer end opening in the axial direction of the outer ring 28 on the outer peripheral surface. The inner ring raceway 36a in the axially outer row is provided at the middle portion in the direction, and the small-diameter step portion 38 is provided at the inner end portion in the axial direction. In addition, a spline hole 37 is provided in the axial direction at the center of the hub body 33 in the radial direction.
The inner ring 34 has an inner ring raceway 36b in the inner row in the axial direction on the outer peripheral surface, and is externally fitted to a small diameter step portion 38 of the hub body 33.

  Each of the rolling elements 30, 30 is provided between the outer ring raceways 31a, 31b and the inner ring raceways 36a, 36b so as to be capable of rolling plurally for each row. In the illustrated example, a ball is used as each of the rolling elements 30, 30, but in the case of a rolling bearing unit for supporting a wheel for an automobile that is heavy in weight, a tapered roller may be used instead of the ball. .

  In order to connect the output shaft 20 of the wheel side constant velocity joint 3 to the hub 29 of the wheel support rolling bearing unit 27, specifically, the spline hole 37 of the hub body 33 is inserted into the spline hole 37 of the hub main body 33. A spline shaft portion 39 provided at the intermediate portion in the axial direction is engaged with the spline. At the same time, the axially inner side surface of the nut 41 screwed into the external threaded portion 40 provided at the axially outer end portion of the output shaft 20 and further tightened, and the axially outer side surface of the bottom portion 17 of the joint outer ring 14 The hub 29 is sandwiched between them. In the illustrated example, the nuts 41 are tightened in a state in which the outer end surface in the axial direction of the bottom portion 17 of the outer ring 14 for constant velocity joints is in direct contact with the inner end surface in the axial direction of the inner ring 34, thereby A configuration in which a preload is applied to the moving bodies 30 and 30 is employed. However, although illustration is omitted, the axial inner end surface of the inner ring 34 is suppressed by a caulking portion formed by plastically deforming the axial inner end portion of the hub body 33 radially outward. A configuration in which a preload is applied to each of the rolling elements 30 and 30 can also be employed.

  The non-contact transmission device 4 includes a rotation side transmission unit 44 and a stationary side transmission unit 45, and houses the joint housing 5 constituting the differential side constant velocity joint 1 and the differential gear 24. It is assembled with the case 25.

  The rotation-side transmission unit 44 is formed in an annular shape, and is fitted and fixed to the inner end portion in the axial direction of the bottom portion 8 of the joint housing 5. In such a rotation-side transmission unit 44, a rotation-side power coil and a rotation-side signal coil (not shown) are incorporated.

  The stationary-side transmission unit 45 is formed in an annular shape, and is arranged on the outer side in the radial direction of the rotation-side transmission unit 44 in a state of being concentrically disposed near the rotation-side transmission unit 44 and the shaft of the case 25. It is fitted and fixed to the inner peripheral surface of the direction outer end. In such a rotation side transmission unit 45, a stationary side power coil and a stationary side signal coil (not shown) are incorporated. In the case of this example, the case corresponds to a portion that does not rotate during use as described in the claims.

  Such a non-contact transmission device 4 is configured to transmit power between a stationary power coil incorporated in the stationary transmission unit 45 and a rotating power coil incorporated in the rotating transmission unit 44. Has a function of performing non-contact by electromagnetic induction. The non-contact transmission device 4 transmits signals between the stationary signal coil incorporated in the stationary transmission unit 45 and the rotating signal coil incorporated in the rotating transmission unit 44. Has a function of performing non-contact by electromagnetic induction.

  The stationary transmission unit 45 is connected to one end of a vehicle-side power wiring and a vehicle-side signal wiring (not shown). More specifically, one end portion of the vehicle body side power wiring is electrically connected to the stationary side power coil, and one end portion of the vehicle body side signal wiring is the stationary side signal coil. Is electrically connected. Also, the axially outer end opening of the case 25 (the portion between the axially outer end of the case 25 and the outer peripheral surface of the bottom 8 of the joint housing 5 is axially outer than the non-contact transmission device 4). (The portion located at the center) is closed by a sealing means (not shown) (for example, a seal ring), and the vehicle body side power wiring and the vehicle body side signal wiring penetrate the sealing means in an airtight and liquid tight manner. Yes. In addition, the other end of the vehicle body side power wiring is electrically connected to a power supply source installed on the vehicle body side through a connector or the like in use. In addition, the other end of the vehicle body side signal wiring is electrically connected to a signal processing arithmetic unit installed on the vehicle body side through a connector or the like in use.

  One end of each of the power wiring 42 and the signal wiring 43 is connected to the rotation-side transmission unit 44. More specifically, the rotation-side transmission unit 44 has a rectification circuit (not shown), and one end of the power wiring 42 is electrically connected to the rotation-side power coil via the rectification circuit. Has been. On the other hand, one end of the signal wiring 43 is electrically connected to the rotation-side signal coil via a signal shaping circuit (not shown). In this state, the power wiring 42 and the signal wiring 43 are introduced into the differential side through-hole 13 through a radial through-hole (not shown) formed in the bottom 8 of the joint housing 5. Through this differential side through hole 13, the radially inner half of the differential side constant velocity joint 1 in the axial outer half, the radially inner side of the transmission shaft 2 (the shaft through hole 22), and the wheel side constant velocity joint. 3 is inserted in the axial direction (including the wheel-side through-hole 21) in the axial direction, and the other end of each is drawn out from the outer end in the axial direction of the wheel-side through-hole 21 to the outside. In this state, the axially outer end opening of the wheel side through hole 21 is closed by a sealing means (not shown) (for example, a cap or a plug), and the power wiring 42 and the signal wiring 43 are The sealing means penetrates in a gas-tight and liquid-tight manner. Further, the other end portions of the power wiring 42 and the signal wiring 43 drawn out from the axial outer end portion of the wheel side through-hole 21 are connected to the wheel ( Tires and wheels) are electrically connected to the sensors.

  When the wheel driving unit of the present example having the above-described configuration is used, the driving force of the wheel is transmitted from the differential gear 24 to the differential side constant velocity joint 1, the transmission shaft 2, and the wheel side constant velocity joint. 3. Transmitted in the order of the hub 29 and the wheels.

  In addition, power transmitted from the power supply source installed on the vehicle body side through the vehicle body power wiring is supplied to the sensor via the contactless transmission device 4 and the power wiring 42. . Thereby, this sensor detects the physical quantity (for example, tire air pressure, load load, acceleration, temperature, etc.) of the wheel. And the detection signal of this sensor is transmitted to the arithmetic unit for signal processing installed on the vehicle body side via the signal wiring 43, the non-contact transmission device 4, and the vehicle body side signal wiring. . As a result, the detection signal of the sensor is used for vehicle motion control and the like.

  In addition, in the case of the wheel drive unit of this example, as described above, the sensor can be supplied with electric power having a magnitude corresponding to the power consumption, and the non-contact transmission of a size required for that purpose. The apparatus 4 can be easily installed. That is, in the case of this example, the installation location of the non-contact transmission device 4 is a peripheral portion of the differential side constant velocity joint 1 and the differential gear 24. The peripheral portions of the differential-side constant velocity joint 1 and the differential gear 24 have a larger space than the peripheral portions of the wheel-supporting rolling bearing unit, which is an installation location of the above-described conventional contactless transmission device. For this reason, in the case of this example, the non-contact transmission device 4 having a required size can be easily installed.

  Further, in the case of this example, the non-contact transmission device 4 is installed in the peripheral portion of the differential side constant velocity joint 1 and the differential gear 24 (upper part of the automobile). Therefore, unlike the conventional structure described above, the non-contact transmission device 4 is resistant to large vibrations and impacts, unlike the case where the non-contact transmission device is installed in a wheel-supporting rolling bearing unit (under the spring of an automobile). It is not necessary to have the performance to obtain, and the cost can be reduced accordingly.

  In the case of this example, the non-contact transmission device 4, the power wiring 42 and the signal wiring 43 are not installed in the wheel support rolling bearing unit 27. Even when the supporting rolling bearing unit 27 is replaced, the contactless transmission device 4, the power wiring 42, and the signal wiring 43 can be used as they are.

  In the case of this example, the non-contact transmission device 4 is installed on the axially outer side than the rolling bearing 46 for rotatably supporting the output portion 26 of the differential gear 24 with respect to the case 25. Therefore, the vehicle-side power wiring and the vehicle-side signal wiring that connect the power supply source and signal processing unit installed on the vehicle body side to the stationary transmission unit 45 of the non-contact transmission device 4 Can be easily handled and maintained.

In the illustrated example, the power wiring 42 and the signal wiring 43 are represented by a single representative line, but more specifically, the power wiring 42 includes a power line and a ground line. It is configured by at least two, and the signal wiring 43 may be appropriately plural in accordance with the number of electronic devices such as sensors and signal standards.
In addition, a rectifier circuit may be provided inside the rotation-side transmission unit 44 of the non-contact transmission device 4, or a rectifier circuit may be provided in a part of the power wiring 42.

[Second Example of Embodiment]
A second example of the embodiment of the present invention will be described with reference to FIGS.
In the case of this example, the non-contact transmission device 4a is assembled to a rolling bearing 46 called a differential side bearing for rotatably supporting the output portion 26 of the differential gear 24 with respect to the case 25.

In the case of the illustrated example, the rolling bearing 46 is a tapered roller bearing, and includes an inner ring 47, an outer ring 48, and a plurality of tapered rollers 49 and 49.
Among these, the inner ring 47 has a conical convex inner ring raceway 50 whose inner side in the axial direction is the larger diameter side in the axially intermediate part of the outer peripheral surface, a small collar part 51 at the outer end in the axial direction, Each end has a large collar portion 52 and is externally fixed to the output portion 26 of the differential gear 24.
The outer ring 48 has a conical concave outer ring raceway 53 whose inner side in the axial direction is a large diameter side at an axially intermediate portion or inner end portion of the inner peripheral surface, and is fitted and fixed to the case 25. .
Each of the tapered rollers 49, 49 is rotatably provided between the inner ring raceway 50 and the outer ring raceway 53 while being held by a cage (not shown).

The rotation-side transmission portion 44a constituting the non-contact transmission device 4a is supported and fixed to the inner ring 47 by an inner diameter side support member 54.
The inner diameter side support member 54 has a crank-shaped cross section and is formed in an annular shape as a whole. The inner diameter side holding cylindrical portion 55 and the inner end in the axial direction of the inner diameter side holding cylindrical portion 55 are radially outer. The inner diameter side retaining ring portion 56 provided in a state extending in the direction of the cylinder, and the cylindrical inner diameter provided in a state extending inward in the axial direction from the radially outer end portion of the inner diameter side retaining ring portion 56 The side fitting cylinder part 57 is provided.
The rotation-side transmission portion 44a is held and fixed in an annular holding space defined by the inner diameter side holding cylindrical portion 55 and the inner diameter side holding ring portion 56 by bonding, screwing, caulking, or the like. Yes.
In this state, the rotation-side transmission portion 44a externally fits the inner diameter side fitting tube portion 57 to the small flange portion 51 of the inner ring 47, and the inner side of the inner diameter side retaining ring portion 56 in the axial direction. It is supported and fixed to the inner ring 47 in a state in which the side surface is brought into contact with the outer surface in the axial direction of the inner ring 47 so as to be positioned in the axial direction.

The stationary transmission unit 45a constituting the non-contact transmission device 4a is supported and fixed to the outer ring 48 by an outer diameter side support member 58. In the case of this example, the outer ring 48 corresponds to a portion that does not rotate during use as described in the claims.
The outer diameter side support member 58 has a crank shape in cross section and is formed in an annular shape as a whole. From the outer diameter side holding cylindrical portion 59 and the inner end portion in the axial direction of the outer diameter side holding cylindrical portion 59 An outer diameter side retaining ring portion 60 provided in a state extending radially inward, and a state extending inward in the axial direction from a radially inner end portion of the outer diameter side retaining ring portion 60. A cylindrical outer diameter side fitting tube portion 61.
The stationary side transmission part 45a is held and fixed by bonding, screwing, caulking, etc. in an annular holding space defined by the outer diameter side holding cylindrical part 59 and the outer diameter side holding ring part 60. Has been.
In this state, the stationary-side transmission portion 45a fits the outer-diameter-side fitting cylinder portion 61 into an outer end in the axial direction of the inner peripheral surface of the outer ring 48 with an interference fit, and the outer-diameter-side holding circle. The ring portion 60 is supported and fixed to the outer ring 48 in a state in which the axial inner surface is brought into contact with the outer surface of the outer ring 48 in the axial direction.

  Also in this example, the axially outer end opening of the case 25 (the portion between the axially outer end of the case 25 and the bottom 8 of the joint housing 5 or the outer peripheral surface of the input shaft 12 is The portion located outside the non-contact transmission device 4a in the axial direction) is closed by a sealing means (for example, a seal ring) (not shown), and the vehicle body side power wiring connected to the stationary side transmission unit 45a and The vehicle body side signal wiring penetrates the sealing means in an airtight and liquid tight manner.

In the case of this example having the above-described configuration, the rolling bearing 46 and the non-contact transmission device 4a can be handled integrally, so that the assemblability can be improved and the rotation-side transmission unit 44a and the stationary side can be improved. It becomes easy to properly regulate and maintain the positional relationship with the transmission unit 45a.
Other configurations and operations are the same as those in the first example of the embodiment described above.

[Third example of embodiment]
A third example of the embodiment of the present invention will be described with reference to FIG.
In the case of this example, the sensor 62a is installed on the radially inner side of the axial one end located inside the joint housing 5 among the axial both ends of the transmission shaft 2, and on the inner side of the joint outer ring 14. A sensor 62b is installed on the radially inner side of the other axial end portion. The power wiring 42 and the signal wiring 43 are electrically connected to both the sensors 62a and 62b via a connector or the like. As a result, physical quantities (for example, acceleration, temperature, etc.) at both ends of the transmission shaft 2 are detected by the sensors 62a and 62b, and the detection signals of the sensors 62a and 62b are sent to the arithmetic unit on the vehicle body side. You can send. In the case of this example, for example, when both the sensors 62a and 62b are gyro sensors (angular velocity sensors) and the transmission shaft 2 is elastically twisted by the torque transmitted by the transmission shaft 2, the two sensors 62a, If the difference between the angular velocities generated in 62b is detected based on the output signals of both the sensors 62a and 62b, the torsional magnitude and the torque can be obtained based on the detection results.

In the case of this example, the power wiring 42 and the signal wiring 43 do not extend outward in the axial direction from the sensor 62 b located at the axially outer end of the transmission shaft 2. For this reason, the wheel side through-hole 21 (refer FIG. 1) is not provided in the radial inside of the output shaft 20 of the wheel side constant velocity joint 3. However, when the present invention is implemented, the wheel side through hole 21 is provided, and the wheel side through hole 21 is extended to the outside in the axial direction from the sensor 62b. Can also be inserted.
Other configurations and operations are the same as those in the first example of the embodiment described above.

  In addition, this invention can also be implemented combining the structure of each embodiment mentioned above suitably.

The wheel driving unit of the present invention can be applied to either front wheel driving or rear wheel driving.
When the present invention is implemented, the non-contact transmission device can have only a power transmission function and can be connected only to the power wiring. In this case, a signal (information) obtained by an electronic device such as a sensor can be transmitted to an arithmetic unit on the vehicle body side using, for example, a wireless communication device.
Moreover, when implementing this invention, the transmission system of the electric power by a non-contact transmission apparatus is not restricted to an electromagnetic induction system, For example, a magnetic resonance system can also be utilized.
Moreover, when implementing this invention, the signal transmission method by a non-contact transmission apparatus is not restricted to an electromagnetic method, The method using light can also be utilized.

DESCRIPTION OF SYMBOLS 1 Differential side constant velocity joint 2 Transmission shaft 3 Wheel side constant velocity joint 4, 4a Non-contact transmission device 5 Housing for joints 6 Tripod 7 Roller 8 Bottom part 9 Recessed part 10 Base part 11 Trunnion 12 Input shaft 13 Differential side through-hole 14 Outer ring for joints DESCRIPTION OF SYMBOLS 15 Inner ring for joints 16 Ball 17 Bottom part 18 Outer engagement groove 19 Inner engagement groove 20 Output shaft 21 Wheel side through hole 22 Shaft through hole 23a, 23b Boot 24 Differential gear 25 Case 26 Output part 27 Rolling bearing unit 28 for wheel support Outer ring 29 Hub 30 Rolling elements 31a, 31b Outer ring raceway 32 Stationary side flange 33 Hub body 34 Inner ring 35 Rotary side flange 36a, 36b Inner ring raceway 37 Spline hole 38 Small diameter step part 39 Spline shaft part 40 Male thread part 41 Nut 42 Power wiring 43 Signal wiring 44, 44a Rotation side transmission part 45, 45a Stationary side transmission part 46 Rolling bearing 47 Inner ring 48 Outer ring 49 Tapered roller 50 Inner ring raceway 51 Small flange part 52 Large collar part 53 Outer ring raceway 54 Inner diameter side support member 55 Inner diameter side support Cylindrical portion 56 Inner diameter side retaining annular portion 57 Inner diameter side fitting cylindrical portion 58 Outer diameter side supporting member 59 Outer diameter side retaining cylindrical portion 60 Outer diameter side retaining annular portion 61 Outer diameter side fitting cylindrical portion 62a, 62b Sensor

Claims (2)

A differential side constant velocity joint and a transmission shaft;
The differential side constant velocity joint includes a differential side input part coupled to an output part of a differential gear, and a differential side output part coupled to one axial end of the transmission shaft. There,
A rotation-side transmission unit supported directly or via another member on the differential-side constant velocity joint, and a stationary-side transmission supported near the rotation-side transmission unit and supported by a portion that does not rotate during use. A non-contact transmission device having a function of performing non-contact power transmission between the stationary side transmission unit and the rotation side transmission unit,
Power wiring connected to the rotation side transmission unit,
The wheel driving unit, wherein the power wiring passes through the radial inner side of the transmission shaft in the axial direction. Further equipped with a wheel side constant velocity joint,
The wheel side constant velocity joint is inserted into the hub in a state where the wheel side input portion coupled to the other axial end portion of the transmission shaft and the inner side in the radial direction of the hub constituting the wheel bearing rolling bearing unit are inserted. A wheel side output unit to be coupled,
The wheel drive unit according to claim 1, wherein the power wiring inserted in the radial direction inside of the transmission shaft in the axial direction passes through the radial inside of the wheel side constant velocity joint in the axial direction.

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