JP7327098B2 - drive wheel drive - Google Patents

Description

The present disclosure relates to a drive wheel drive device that drives a pair of drive wheels of a vehicle.

Patent Document 1 describes a left and right driving force adjusting device for a vehicle, which has a differential gear and a driving force adjusting mechanism between left and right driving wheels and adjusts distribution of driving force to the left and right driving wheels. . When the vehicle turns, it is necessary to provide an appropriate torque difference between the left and right drive wheels.

JP 2013-173527 A

However, with the vehicle left and right driving force adjusting device described in Patent Document 1, it is difficult to adjust the turning performance of the vehicle by arbitrarily adjusting the torque difference applied between the left and right driving wheels.

In view of the circumstances described above, an object of at least one embodiment of the present disclosure is to provide a driving wheel drive device that enables adjustment of the turning performance of a vehicle.

A drive wheel drive device according to at least one embodiment of the present disclosure is a drive wheel drive device that drives a pair of drive wheels of a vehicle, and includes a first drive force that provides a drive force for driving the pair of drive wheels. and a differential gear for distributing the driving force from the first driving force source to each of the pair of driving wheels, comprising: a differential case; a pair of side gears housed in the differential case; and a pair of side gears housed in the differential case. a differential gear comprising a pinion gear meshing with a second driving force source for applying a driving force for adjusting a torque difference between a pair of driving wheels; and transmitting the driving force from the second driving force source to the differential gear. a gear mechanism for transmitting force to the pinion gear of the differential gear, the gear mechanism comprising a rotating member configured to be rotatable by driving force from the second driving force source; and rotation of the rotating member. to the pinion gear. According to this configuration, when the vehicle turns, it is possible to adjust the torque difference between the pair of drive wheels by adjusting the driving force from the second driving force source, so that the turning performance of the vehicle can be adjusted.

In some embodiments, the first driving force source and the differential gear are meshed by a first drive pinion gear connected to the first output shaft of the first driving force source and a first ring gear fixed to the differential case. The second driving force source and the gear mechanism are connected by meshing the second drive pinion gear connected to the second output shaft of the second driving force source and the second ring gear fixed to the rotating member. Both the combination of the first drive pinion gear and the first ring gear and the combination of the second drive pinion gear and the second ring gear may be bevel gears. According to this configuration, when the first driving force source and the second driving force source are motors, the rotation of the motors is perpendicular to the traveling direction of the vehicle, and is independent of the acceleration and deceleration of the vehicle. , the shaking of the vehicle can be reduced.

In some embodiments, the first driving force source and the differential gear are meshed by a first drive pinion gear connected to the first output shaft of the first driving force source and a first ring gear fixed to the differential case. The second driving force source and the gear mechanism are connected by meshing the second drive pinion gear connected to the second output shaft of the second driving force source and the second ring gear fixed to the rotating member. Both the combination of the first drive pinion gear and the first ring gear and the combination of the second drive pinion gear and the second ring gear may be spur gears.

In some embodiments, the first driving force source and the differential gear are meshed by a first drive pinion gear connected to the first output shaft of the first driving force source and a first ring gear fixed to the differential case. The second driving force source and the gear mechanism are connected by meshing the second drive pinion gear connected to the second output shaft of the second driving force source and the second ring gear fixed to the rotating member. Either one of the combination of the first drive pinion gear and the first ring gear and the combination of the second drive pinion gear and the second ring gear may be a spur gear and the other may be a bevel gear.

In some embodiments, the second source of motive power may be a motor. Since the driving force from the second driving force source can be adjusted more quickly than when the second driving force source is the engine, it is possible to adjust the torque difference between the pair of driving wheels, and therefore the turning performance of the vehicle. can be done quickly.

According to at least one embodiment of the present disclosure, when the vehicle turns, the torque difference between the pair of drive wheels can be adjusted by adjusting the driving force from the second driving force source, thereby adjusting the turning performance of the vehicle. can do.

1 is a schematic diagram showing the configuration of a driving wheel drive device according to an embodiment of the present disclosure; FIG. FIG. 3 is a schematic diagram showing the configuration of a modification of the drive wheel drive device according to the embodiment of the present disclosure; FIG. 5 is a schematic diagram showing the configuration of another modification of the drive wheel drive device according to the embodiment of the present disclosure; FIG. 5 is a schematic diagram showing the configuration of still another modified example of the drive wheel drive device according to the embodiment of the present disclosure;

Hereinafter, among several embodiments of the present invention, an example in which two pinion gears mesh with the side gear will be described with reference to the drawings. However, the scope of the present invention is not limited to the following embodiments. The dimensions, materials, shapes, relative positions, and the like of components described in the following embodiments are not intended to limit the scope of the present invention, but merely illustrative examples. Furthermore, the first driving force source and the second driving force source may be separate bodies, or may be an integral body sharing a housing.

FIG. 1 schematically shows the configuration of a drive wheel drive device 1 according to an embodiment of the present disclosure for driving a pair of drive wheels of a vehicle, that is, a left wheel 101 and a right wheel 102. As shown in FIG. The driving wheel drive device 1 includes a first motor 2 which is a first driving force source that provides driving force for driving the left wheel 101 and the right wheel 102, and the driving force from the first motor 2 to the left wheel 101 and the right wheel. A differential gear 4 distributed to each of the wheels 102, a second motor 3 as a second driving force source that provides driving force for adjusting the torque difference between the left wheel 101 and the right wheel 102, and the second motor 3 and a gear mechanism 5 for transmitting the driving force of to the differential gear 4 .

The differential gear 4 includes a first ring gear 11 meshing with a first drive pinion gear 22 connected to a first output shaft 21 of the first motor 2, a differential case 12 to which the first ring gear 11 is fixed, and housed in the differential case 12. and pinion gears 15 and 16 accommodated in the differential case 12 and meshing with the pair of side gears 13 and 14. - 特許庁

The gear mechanism 5 includes a second ring gear 41 that meshes with a second drive pinion gear 32 connected to a second output shaft of the second motor 3 , a rotating member 42 to which the second ring gear 41 is fixed, and a rotating member 42 that is fixed to the rotating member 42 . and transmission members 44 and 45 for transmitting the rotation of the rotating member 42 to the pinion gears 15 and 16, respectively. The transmission member 44 includes a second pinion gear 46 that meshes with the third ring gear 43 and a transmission shaft 48 that connects the second pinion gear 46 and the pinion gear 15 . The transmission member 45 includes a second pinion gear 47 that meshes with the third ring gear 43 and a transmission shaft 49 that connects the second pinion gear 47 and the pinion gear 16 . The transmission shafts 48 and 49 respectively penetrate the differential case 12 .

The first ring gear 11, side gears 13, 14, and pinion gears 15, 16 of the differential gear 4 are bevel gears. The second ring gear 41 and the third ring gear 43 of the rotating member 42 are bevel gears. The second pinion gears 46, 47 of the transmission members 44, 45 are bevel gears, respectively. The first drive pinion gear 22 of the first motor 2 and the second drive pinion gear 32 of the second motor 3 are bevel gears. Further, the rotating member 42 may have a tubular shape, for example, a cylindrical shape, and a part of the differential case 12 may be inserted into the rotating member 42 in its axial direction.

Next, the operation of the drive wheel drive system 1 according to one embodiment of the present disclosure will be described. The left wheel 101 and right wheel 102 are driven by the driving force given from the first motor 2 . When the first motor 2 is operated and the first output shaft 21 and the first drive pinion gear 22 rotate leftward in FIG. rotates in the direction of arrow B, and the differential case 12 to which the first ring gear 11 is fixed also rotates in the direction of arrow B. As a result, the left wheel 101 and the right wheel 102 rotate in the direction of the arrow C, so that the vehicle having the left wheel 101 and the right wheel 102 as driving wheels travels straight in the direction of the arrow D.

In the driving wheel drive device 1, the differential gear 4 and the gear mechanism 5 are connected, so it is necessary for the gear mechanism 5 to rotate together with the rotation of the differential case 12. If the gear mechanism 5 is caused to rotate by the rotation of the differential case 12, it becomes a resistance when the differential case 12 rotates. Therefore, when the vehicle having the left wheel 101 and the right wheel 102 as driving wheels travels straight, the driving force applied from the second motor 3 drives the second motor 3 so that the gear mechanism 5 rotates together with the differential case 12 . drive.

Specifically, when the second motor 3 operates and the second output shaft 31 and the second drive pinion gear 32 rotate rightward in FIG. The second ring gear 41 rotates in the arrow F direction, and the rotating member 42 to which the second ring gear 41 is fixed also rotates in the arrow F direction. By adjusting the driving force applied from the second motor 3 , the gear mechanism 5 can be rotated together with the differential case 12 .

Next, the operation of the driving wheel drive system 1 when the vehicle having the left wheels 101 and the right wheels 102 as the driving wheels turns to the left will be described. When turning to the left, the rotation speed of the left wheel 101 decreases and the rotation speed of the right wheel 102 increases. Since the relationship between the rotational speeds of the left wheel 101 and the right wheel 102 is as described above, the left wheel 101 tries to decelerate the left wheel 101 from the road surface when the vehicle turns to the left in the differential gear 4. When a force is received, the force is transmitted to the side gear 13 connected to the left wheel 101 as a force in the rotational direction (direction of arrow I) in which the side gear 13 decelerates, and the side gear 13 decelerates, so that the pinion gears 15 and 16 mutually move. In the opposite direction, that is, the pinion gear 15 rotates rightward (direction of arrow G) in FIG. 1 and the pinion gear 16 rotates leftward (direction of arrow H) in FIG. The force that rotates the pinion gear 15 and the pinion gear 16 in this way is transmitted to the side gear 14 as a force in the direction of rotation (the direction of arrow J) in which the side gear 14 accelerates, and the side gear 14 accelerates. The rotation speed of the right wheel 102 connected to the side gear 14 increases. In this way, the differential gear 4 can create a relationship in which the rotational speed of the left wheel 101 is decreased and the rotational speed of the right wheel 102 is increased.

If an appropriate torque difference can be applied between the left wheel 101 and the right wheel 102 when the vehicle turns to the left, the turning performance of the vehicle can be adjusted. In the drive wheel drive device 1, by adjusting the driving force from the second motor 3, the torque difference between the left wheel 101 and the right wheel 102 can be adjusted, and the turning performance of the vehicle can be adjusted.

For example, in order to further improve the turning performance of the vehicle when the vehicle turns to the left, the rotation speed of the second output shaft 31 and the second drive pinion gear 32 in the direction of arrow E is increased so that the second rotation speed is increased. Adjust the driving force of the motor 3. As a result, the rotation speed of the rotating member 42 in the direction of arrow F becomes higher than the rotation speed of the differential case 12 in the direction of arrow B, so that the second pinion gear 46 meshing with the third ring gear 43 will not rotate when the vehicle turns leftward. As the pinion gear 15 rotates in the same direction as the rotation direction G of the pinion gear 15, the second pinion gear 47 meshing with the third ring gear 43 also rotates when the vehicle turns leftward. , and the pinion gear 16 rotates more. By adjusting the driving force of the second motor 3 in this way, the rotation of the second pinion gears 46, 47 is transmitted to the pinion gears 15, 16 via the transmission shafts 48, 49, so that the driving force of the second motor 3 is is applied between the left wheel 101 and the right wheel 102 according to the adjustment of .

Further, by reversing the driving force of the second motor 3 to reduce the rotational speeds of the second output shaft 31 and the second drive pinion gear 32 in the direction of the arrow E, the left wheel 101 and It is also possible to suppress the torque difference between the right wheels 102 and suppress the turning performance of the vehicle.

The operation of the differential gear 4 when the vehicle turns to the right is performed by rotating the side gears 13 and 14 and the pinion gears 15 and 16 in the opposite direction to the operation when the vehicle turns to the left. In order to improve the turning performance when the vehicle turns to the right, the adjustment of the driving force of the second motor 3 should be reversed with respect to the operation when the vehicle turns to the left. Just do it.

Furthermore, by reversing the adjustment of the driving force of the second motor 3 to increase the rotational speed of the second output shaft 31 and the second drive pinion gear 32 in the direction of the arrow E, the left It is also possible to suppress the turning performance of the vehicle by suppressing the torque difference between the wheel 101 and the right wheel 102 .

Thus, when the vehicle turns, the torque difference between the left wheel 101 and the right wheel 102 can be adjusted by adjusting the driving force from the second motor 3, so the turning performance of the vehicle can be adjusted.

As shown in FIG. 2, in the driving wheel drive device 1, the combination of the first ring gear 11 and the first drive pinion gear 22 and the combination of the second drive pinion gear 32 and the second ring gear 41 are respectively They may be spur gears or, as shown in FIGS. 3 and 4, either combination may be spur gears and the other combination bevel gears.

On the other hand, in the configuration of FIG. 1, the rotation of each of the first motor 2 and the second motor 3 is perpendicular to the traveling direction of the vehicle, and is independent of the acceleration and deceleration of the vehicle. can be reduced.

In the above embodiment, both the first driving force source and the second driving force source are motors, but either one of them may be an engine or both may be engines. However, it is preferable that the second motor 3 is a motor. When the second driving force source is a motor, the driving force from the second driving force source can be adjusted more quickly than when it is an engine, so adjustment of the torque difference between the left wheel 101 and the right wheel 102 Therefore, it is possible to quickly adjust the turning performance of the vehicle. If the first and second driving force sources are motors, respectively, the rotation direction of the first output shaft 21 and the second output shaft 31 can be changed by changing the direction of current supplied to each motor. Although it can be realized by simply reversing, if the first driving force source and the second driving force source are respectively engines, gears etc. are required and the configuration becomes complicated, so the first driving force source and the second driving force source Both of the second sources of driving force are preferably motors.

1 driving wheel drive device 2 first motor (first driving force source)
3 Second motor (second driving force source)
4 Differential gear 5 Gear mechanism 11 First ring gear 12 Differential case 13 Side gear 14 Side gear 15 Pinion gear 16 Pinion gear 21 First output shaft 22 First drive pinion gear 31 Second output shaft 32 Second drive pinion gear 41 Second ring gear 42 rotating member 43 third ring gear 44 transmission member 45 transmission member 46 second pinion gear 47 second pinion gear 48 transmission shaft 49 transmission shaft 101 left wheel (driving wheel)
102 right wheel (drive wheel)

Claims (5)

A drive wheel drive device for driving a pair of drive wheels of a vehicle,
a first driving force source that provides a driving force for driving the pair of driving wheels;
A differential gear that distributes the driving force from the first driving force source to each of the pair of driving wheels, comprising: a differential case; a pair of side gears housed in the differential case; a differential gear comprising a pair of side gears and a pinion gear meshing with each other;
a second driving force source that provides a driving force for adjusting the torque difference between the pair of driving wheels;
a gear mechanism for transmitting the driving force from the second driving force source to the differential gear;
The gear mechanism is
a rotating member provided to transmit force to the pinion gear of the differential gear and configured to be rotatable by the driving force from the second driving force source;
and a transmission member that transmits rotation of the rotating member to the pinion gear. The first driving force source and the differential gear are connected by meshing a first drive pinion gear connected to a first output shaft of the first driving force source and a first ring gear fixed to the differential case. ,
The second driving force source and the gear mechanism are connected by meshing a second drive pinion gear connected to a second output shaft of the second driving force source and a second ring gear fixed to the rotating member. is,
2. The drive wheel drive according to claim 1, wherein both the combination of the first drive pinion gear and the first ring gear and the combination of the second drive pinion gear and the second ring gear are bevel gears. Device. The first driving force source and the differential gear are connected by meshing a first drive pinion gear connected to a first output shaft of the first driving force source and a first ring gear fixed to the differential case. ,
The second driving force source and the gear mechanism are connected by meshing a second drive pinion gear connected to a second output shaft of the second driving force source and a second ring gear fixed to the rotating member. is,
2. The drive wheel drive of claim 1, wherein both the combination of the first drive pinion gear and the first ring gear and the combination of the second drive pinion gear and the second ring gear are spur gears. Device. The first driving force source and the differential gear are connected by meshing a first drive pinion gear connected to a first output shaft of the first driving force source and a first ring gear fixed to the differential case. ,
The second driving force source and the gear mechanism are connected by meshing a second drive pinion gear connected to a second output shaft of the second driving force source and a second ring gear fixed to the rotating member. is,
One of the combination of the first drive pinion gear and the first ring gear and the combination of the second drive pinion gear and the second ring gear is a spur gear and the other is a bevel gear. 2. The drive wheel drive device according to 1. The driving wheel driving device according to any one of claims 1 to 4, wherein said second driving force source is a motor.

Images