JP2010264783A - Power transmission device for drive motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device for a drive motor capable of suppressing an increase of the size of the device and improving traveling performance on a rough road of a vehicle. <P>SOLUTION: The power transmission device 1 includes the drive motor 5 for inputting a drive force into a power transmission member 3, a differential mechanism 15 and an intermittent mechanism 17 for power transmission provided between the power transmission member 3 and a differential case 7 to intermit the drive force, and is mounted to a power system different from power systems to be driven by other power sources. An intermittent mechanism 19 for limiting differentiation is provided between the differential case 7 and a side gear 13 to intermittently continue the differentiation of the differential mechanism 15. Pressing and moving operations are performed for a first operation member 23 for intermittently operating an intermitting part 21 for power transmission and a second operation member 25 for intermittently operating an intermitting part 27 for limiting differentiation by a pressing member 31 for which a moving operation is performed in an axial direction by an actuator 29. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drive motor power transmission device applied to a power system on the drive motor side of a four-wheel drive vehicle that uses a fuel engine and a drive motor in combination as a drive source.

  2. Description of the Related Art Conventionally, as a drive motor power transmission device applied to a four-wheel drive vehicle, a vehicle including a fuel engine for driving a front wheel side power system and a drive motor for driving a rear wheel side power system as a drive source. Is known in which a differential device is mounted on the power system on the rear wheel side and the driving force from the drive motor is transmitted to the differential device via an intermittent mechanism including a friction clutch (see, for example, Patent Document 1). .

  In this drive motor power transmission device, an actuator for intermittently operating the intermittent mechanism is provided. The intermittent mechanism is connected by operating the actuator, and the driving force is transmitted from the drive motor to the differential device. By connecting the intermittent mechanism, the vehicle is in a four-wheel drive state, and can travel on a rough road such as a snowy road.

JP 2003-104073 A

  However, in the power transmission device for a drive motor disclosed in Patent Document 1, for example, the driving force is evenly applied to the left and right wheels by the differential function of the differential device under adverse conditions in which one side of the left and right wheels is disposed on ice. There was a possibility that the vehicle could not get out of the rough road.

  Although it is conceivable to provide a diff lock function for such a drive motor power transmission device, when the diff lock function is provided, a lock mechanism that locks the differential device and an actuator that operates the lock mechanism There is a risk of increasing the size and weight of the apparatus.

  Therefore, an object of the present invention is to provide a power transmission device for a drive motor that can suppress an increase in the size of the device and can improve running performance on a rough road of a vehicle.

  According to the first aspect of the present invention, a drive motor that inputs a driving force to a power transmission member that is rotatably provided, a differential case that is provided so as to be relatively rotatable with the power transmission member, and a rotation supported by the differential case. And a differential mechanism comprising a pinion that revolves as the differential case rotates, and a pair of side gears that mesh with the pinion and that can rotate relative to each other, and the drive force is intermittently provided between the power transmission member and the differential case. A drive motor power transmission device mounted in a power system different from a power system driven by another power source, wherein either the differential case or the pair of side gears A differential limiting interrupting mechanism for interrupting the differential of the differential mechanism is provided between the one side gear and the power transmission interrupting mechanism. A power transmission interrupting portion provided between a member and the differential case; and a first operation member that is provided so as to be movable in an axial direction and intermittently operates the power transmission interrupting portion. The interrupting mechanism includes a second operating member that is integrally rotatable with the differential case and is axially movable, and a differential limiting interrupting portion provided between the second operating member and the one side gear. The first operating member and the second operating member are pressed and moved by a pressing member that is moved in the axial direction by an actuator.

  The invention according to claim 2 is the power transmission device for the drive motor according to claim 1, wherein the power transmission intermittent portion is connected between the differential case and the first operation member in the direction of releasing the connection. A first urging member for urging the first operating member is provided, and the difference between the differential case and the second operating member is approximately equal to the first urging member with the urging force. A second urging member that urges the second operating member in a connection release direction of the movement restricting interrupting portion is provided, and the first urging member is interposed between the first operating member and the pressing member. A third urging member having a larger urging force than the urging member and the second urging member and displaceable when the differential limiting interrupting portion is connected is provided. To do.

  A third aspect of the present invention is the drive motor power transmission device according to the first or second aspect, wherein the actuator includes a motor.

  In the drive motor power transmission device according to the first aspect, since the differential limiting interrupting mechanism for interrupting the differential of the differential mechanism is provided, the differential mechanism can be locked and a rough road of the vehicle. You can improve your running performance.

  Further, since the first operating member of the power transmission interrupting mechanism and the second operating member of the differential limiting interrupting mechanism are operated by one actuator, the first operating member and the second operating member are operated. It is not necessary to mount the actuators to be separately provided, and the size and weight of the apparatus can be suppressed.

  Therefore, the enlargement of the apparatus can be suppressed and the running performance on the rough road of the vehicle can be improved.

  The power transmission device for a drive motor according to claim 2 is provided with a third urging member having a urging force different from that of the first and second urging members. The limiting interrupting mechanism can be operated in stages. For this reason, even on rough roads that cannot be driven in the four-wheel drive state with the power transmission interrupting mechanism connected, the actuator is further operated to displace the third biasing member and connect the differential limiting interrupting part. By doing so, the differential mechanism is locked and the vehicle can run on a rough road.

  In the power transmission device for a drive motor according to the third aspect, since the actuator has a motor, the movement distance of the pressing member can be accurately controlled by the rotation of the motor, and the power transmission intermittent portion and the differential limiting intermittent portion can be controlled. Intermittent characteristics can be stabilized.

It is the schematic which shows the motive power system of a vehicle. It is sectional drawing of the power transmission device for drive motors concerning an embodiment of the invention. It is a characteristic view which shows the displacement amount with respect to the load of the 1st biasing member of the power transmission device for drive motors concerning embodiment of this invention, and a 2nd biasing member. It is a characteristic view which shows the displacement amount with respect to the load of the 3rd biasing member of the power transmission device for drive motors concerning embodiment of this invention. (A) It is a principal part expanded sectional view before operating the actuator of the power transmission device for drive motors concerning embodiment of this invention. (B) It is a principal part expanded sectional view when the power transmission intermittent part is connected from the state of Fig.5 (a). (C) It is a principal part expanded sectional view when the connection part for a differential restriction | limiting is connected from the state of FIG.5 (b).

  A power transmission device for a drive motor according to an embodiment of the present invention will be described with reference to FIGS.

  The drive motor power transmission device 1 according to the present embodiment includes a drive motor 5 that inputs a driving force to a power transmission member 3 that is rotatably provided, and a differential case 7 that is provided to be relatively rotatable with the power transmission member 3. A differential mechanism 15 comprising a pinion 9 supported by the differential case 7 and capable of rotating, and revolving by the rotation of the differential case 7, and a pair of side gears 11 and 13 that mesh with the pinion 9 and can rotate relative to each other. A power transmission interrupting mechanism 17 that is provided between the power transmission member 3 and the differential case 7 and interrupts the driving force is provided, and is separate from the front-wheel-side power system 115 driven by the engine 101 as another power source. It is mounted on the power system 125 on the rear wheel side.

  Between the differential case 7 and the side gear 13, a differential limiting intermittent mechanism 19 that interrupts the differential of the differential mechanism 15 is provided. The power transmission intermittent mechanism 17 includes the power transmission member 3 and the differential case 7. And a first operation member 23 that is provided so as to be movable in the axial direction and that intermittently operates the power transmission intermittent portion 21. A second operating member 25 that is integrally rotatable with the differential case 7 and is movable in the axial direction, and a differential limiting interrupting portion 27 provided between the second operating member 25 and the side gear 13. The first operating member 23 and the second operating member 25 are operated to be pressed by a pressing member 31 that is moved in the axial direction by an actuator 29.

  In addition, a first urging member 33 that urges the first operation member 23 in the direction of disconnection of the power transmission interrupting portion 21 is provided between the differential case 7 and the first operation member 23. 7 and the second operating member 25 are urged by the urging force substantially equal to that of the first urging member 33 to urge the second operating member 25 in the disconnecting direction of the differential limiting intermittent portion 27. A second urging member 35 is provided, and between the first operating member 23 and the pressing member 31 has a larger urging force than the first urging member 33 and the second urging member 35. A third urging member 37 that is displaceable when the differential limiting interrupting portion 27 is connected is provided.

  Furthermore, the actuator 29 has an actuator motor 39 as a motor.

  First, a power system of a vehicle on which the drive motor power transmission device 1 is mounted will be described with reference to FIG.

  As shown in FIG. 1, the power system of the vehicle includes an engine 101 as a drive source, a transmission 103 as a speed change mechanism, a front differential 105 that allows differential of the left and right wheels on the front wheel side, and front axles 107 and 109. And a front-wheel-side power system 115 including front wheels 111 and 113, a drive motor 5 as a drive source, a drive motor power transmission device 1, rear axles 117 and 119, rear wheels 121 and 123, and the like. It is composed of a power system 125 on the rear wheel side. A vehicle indicated by a solid line represents battery hybrid 4WD, and a vehicle indicated by a two-dot chain line represents generator power generation hybrid 4WD.

  In the power system 115 on the front wheel side, the driving force of the engine 101 is transmitted from the transmission 103 to the front differential 105 and distributed to the front wheels 111 and 113 from the front axles 107 and 109 connected to the front differential 105. When driving the power system 115 on the front wheel side using only the engine 101 as a drive source, the vehicle is in a two-wheel drive state of front wheel drive.

  In the power system 125 on the rear wheel side, the drive motor 5 is connected to the battery 127 (in the case of the battery hybrid 4WD) and the generator 129 (in the case of the generator power generation hybrid 4WD) via the controller 131, and is activated by the control of the controller 131. Is done. The controller 131 receives information from various sensors 133 that detect the throttle, accelerator opening, engine speed, vehicle speed, front and rear wheel and left and right wheel speeds, steering angle, and the like. The driving force of the drive motor 5 is transmitted to the power transmission intermittent mechanism 17 via the speed reduction mechanism 53. When the power transmission intermittent mechanism 17 is connected, the driving force is transmitted to the differential mechanism 15 and distributed from the rear axles 117 and 119 connected to the differential mechanism 15 to the rear wheels 121 and 123. Thus, when driving the rear wheel side power system 125 using the drive motor 5 together with the engine 101 as a drive source, the vehicle is in a four-wheel drive state of front and rear wheel drive. Further, in the two-wheel drive state of front wheel drive (except when traveling by the drive motor 5), the drive motor 5 side and the rear wheels 121 and 123 side are separated by releasing the connection of the power transmission intermittent mechanism 17. Therefore, it is possible to prevent the vehicle from being carried around and to improve the fuel efficiency of the vehicle.

  The drive motor power transmission device 1 applied to such a vehicle is provided with a differential limiting intermittent mechanism 19 that limits the differential of the differential mechanism 15 and runs in a four-wheel drive state of front and rear wheel drive. Even on rough roads where this is not possible, the differential mechanism 15 can be made to run by being locked. Hereinafter, the drive motor power transmission device will be described.

  As shown in FIGS. 1 to 5, the drive motor 5 is assembled to the side surface of the stationary casing 41 via a bolt 43, and a motor shaft 45 is disposed inside the casing 41. A drive shaft 47 is provided on the motor shaft 45 so as to be integrally rotatable. The drive shaft 47 is rotatably supported by the casing 41 via bearings 49 and 51, and a small-diameter gear portion 55 that constitutes a speed reduction mechanism 53 is provided at an end portion in the axial direction.

  The speed reduction mechanism 53 includes a small diameter gear portion 55 and a large diameter gear portion 57. The small-diameter gear portion 55 meshes with the large-diameter gear portion 57, and the driving force from the drive motor 5 is decelerated and transmitted to the large-diameter gear portion 57 side. The large-diameter gear portion 57 is formed to have a larger diameter than the small-diameter gear portion 55, and is provided so as to be rotatable integrally with a shaft member 63 that is rotatably supported by the casing 41 via bearings 59 and 61. The shaft member 63 is provided with the power transmission member 3 so as to rotate integrally with the shaft member 63, and the driving force from the drive motor 5 that has been decelerated is transmitted to the power transmission member 3.

  The power transmission member 3 is supported via bearings 65 and 67 so as to be rotatable relative to the differential case 7. The driving force transmitted to the power transmission member 3 is interrupted by a power transmission interrupting mechanism 17 provided between the power transmission member 3 and the power transmission interrupting mechanism 17. A driving force is transmitted to the moving mechanism 15.

  The differential mechanism 15 includes a differential case 7, a pinion shaft 69, a pinion 9, and a pair of side gears 11 and 13. The differential case 7 is rotatably supported on the casing 41 via bearings 75 and 77 by boss portions 71 and 73 formed on both sides in the axial direction. The differential case 7 accommodates a pinion shaft 69, a pinion 9, and a pair of side gears 11 and 13, and the driving force transmitted to the differential case 7 is transmitted to each member.

  The pinion shaft 69 is engaged with the differential case 7 at its end and is prevented from coming off, and is rotated integrally with the differential case 7. A pinion 9 is supported on the pinion shaft 69.

  The pinion 9 is supported by the pinion shaft 69 and revolves by the rotation of the differential case 7. The pinion 9 transmits a driving force to the pair of side gears 11 and 13, and is supported rotatably on the pinion shaft 69 so as to be rotated when a differential rotation occurs between the pair of side gears 11 and 13 engaged with each other. ing.

  The pair of side gears 11 and 13 are supported by the differential case 7 by boss portions 79 and 81 so as to be relatively rotatable, and mesh with the pinion 9. Further, on the inner periphery of the boss portions 79 and 81, a shaft (not shown) connected to the rear axles 117 and 119 is connected to the side gears 11 and 13 so as to be integrally rotatable, and the driving force input to the differential case 7 is rearward. It is distributed to the wheels 121 and 123 side.

  The transmission of the driving force from the power transmission member 3 to the differential mechanism 15 is interrupted by a power transmission intermittent mechanism 17 provided between the power transmission member 3 and the differential case 7.

  The power transmission intermittent mechanism 17 includes a power transmission intermittent portion 21 and a first operation member 23. The power transmission interrupting portion 21 is arranged alternately on the inner periphery of the power transmission member 3 so as to be axially movable and integrally rotatable, and the outer clutch plate and the outer clutch plate are alternately arranged in the axial direction. It is a multi-plate clutch comprising a plurality of inner clutch plates that are axially movable on the outer periphery and are connected to be integrally rotatable. The power transmission interrupting portion 21 is interrupted by the first operating member 23.

  The first operating member 23 is connected to the outer periphery of the differential case 7 so as to be axially movable and integrally rotatable. A first urging member 33 that urges the first operation member 23 in the direction of releasing the connection of the power transmission interrupting portion 21 is provided between the first operation member 23 and the differential case 7 in the axial direction. ing. The first operation member 23 is operated to move in the connecting direction of the power transmission interrupting portion 21 against the biasing force of the first biasing member 33, thereby pressing the power transmission interrupting portion 21. The power transmission interrupting portion 21 is connected, and the driving force is transmitted from the power transmission member 3 to the differential mechanism 15. In this way, the differential mechanism 15 to which the driving force is transmitted is provided with a differential limiting interrupting mechanism 19 for interrupting the differential of the differential mechanism 15.

  The differential limiting intermittent mechanism 19 includes a second operation member 25 and a differential limiting intermittent portion 27. The second operation member 25 is provided so as to be rotatable integrally with the differential case 7 and movable in the axial direction. A differential limiting intermittent portion 27 is provided between the second operating member 25 and the side gear 13.

  The differential limiting intermittent portion 27 is a meshing clutch including a meshing tooth provided on the side gear 13 side of the second operation member 25 and a meshing tooth provided on the second operation member 25 side of the side gear 13. ing. Further, a second urging member 35 that urges the second operating member 25 in the direction of releasing the connection of the differential limiting intermittent portion 27 is provided between the second operating member 25 and the differential case 7 in the axial direction. It has been. The differential limiting interrupting portion 27 moves the second operating member 25 in the connecting direction of the differential limiting interrupting portion 27 against the biasing force of the second biasing member 35, so that the differential limiting interrupting portion 27 is differentially operated. The restriction interrupting portion 27 is connected, and the differential of the differential mechanism 15 is restricted, that is, locked.

  The first operating member 23 that intermittently operates the power transmission intermittent portion 21 and the second operating member 25 that intermittently operates the differential limiting intermittent portion 27 are pressed and operated by the pressing member 31. .

  The pressing member 31 is disposed on the outer periphery of the boss portion 73 of the differential case 7 so as to be movable in the axial direction. Further, between the axial direction of the pressing member 31 and the first operating member 23, a third attachment for urging the pressing member 31 in the connection release direction of the power transmission interrupting portion 21 and the differential limiting interrupting portion 27. A biasing member 37 is provided. A thrust bearing 83 that is in axial contact with the pressing member 31 and the second operating member 25 and slides in the rotational direction is provided between the pressing member 31 and the second operating member 25. On the opposite side of the axial direction where the thrust bearing 83 is provided, there is provided a thrust bearing 85 that slides in the rotational direction with the pressing member 31 and restricts axial movement, and the third urging member 37 and the first operating member. A thrust bearing 87 that is in contact with the third urging member 37 and the first operating member 23 in the axial direction and slides in the rotational direction is provided between the first urging member 37 and the first operating member 23. The pressing member 31 is moved in the axial direction by the actuator 29 to cause the first operating member 23 and the second operating member 25 to be pressed and moved in the axial direction.

  The actuator 29 includes an actuator motor 39 and a cam mechanism 89. The actuator motor 39 is assembled to the side surface of the casing 41, and a motor shaft 91 is disposed inside the casing 41. A gear portion 93 that meshes with the outer periphery of the pressing member 31 is provided on the distal end side of the motor shaft 91, and the pressing member 31 is moved in the axial direction when the motor shaft 91 rotates. The driving force for the axial movement of the pressing member 31 is amplified by the cam mechanism 89.

  The cam mechanism 89 includes a cam surface formed in the circumferential direction on the pressing member 31 and the cam ring 95, and a cam ball 97 interposed between the cam surfaces. The cam ring 95 is fixed to the casing 41, and a cam surface is formed in the circumferential direction of the surface facing the pressing member 31. In addition, a cam surface having the same inclination angle as the cam surface of the cam ring 95 is also formed in the circumferential direction of the surface of the pressing member 31 facing the cam ring 95. Cam balls 97 are arranged between the cam surfaces. The cam ball 97 is axially pressed toward the first operating member 23 and the second operating member 25 by causing the differential rotation between the pressing member 31 and the cam ring 95 due to the rotation of the pressing member 31. Generates a moving cam thrust force.

  Here, the first urging member 33, the second urging member 35, and the third urging member 37 will be described. As shown in FIG. 3, the first urging member 33 and the second urging member 35 have the same displacement (biasing force) with respect to the load. On the other hand, as shown in FIG. 4, the third urging member 37 is not displaced unless a certain amount of load is input, that is, the urging force is set larger than that of the first and second urging members 33 and 35. ing. By using this characteristic, the two intermittent mechanisms 17 and 19 can be intermittently operated by one actuator 29. Below, the intermittent operation | movement of the power transmission device 1 for drive motors is demonstrated.

  First, the actuator 29 is operated to move the pressing member 31 in the axial direction. At this time, the load input from the pressing member 31 to the third urging member 37 is set so that the third urging member 37 is not displaced. Thereby, the first operating member 23 is pressed and moved via the third urging member 37 in which the pressing member 31 is not displaced, and the power transmission intermittent portion 21 is connected. (STEP1)

  Next, the actuator 29 is further operated to move the pressing member 31 in the axial direction. At this time, the load input from the pressing member 31 to the third urging member 37 is set so that the third urging member 37 is displaced. As a result, the third urging member 37 is displaced, the pressing member 31 pushes and moves the second operating member 25, the second urging member 35 is further displaced, and the differential limiting intermittent portion 27 is moved. Connected. (STEP2)

  By utilizing such characteristics of the first, second, and third urging members 33, 35, and 37, the power transmission intermittent portion 21 and the differential limiting intermittent portion 27 are connected in stages. Even when the road is in a four-wheel drive state where the power transmission interrupting portion 21 is connected, the actuator 29 is further operated to connect the differential limiting interrupting portion 27 to connect the differential mechanism. 15 is locked and the vehicle can run on a rough road.

  In such a drive motor power transmission device 1, since the differential limiting interrupting mechanism 19 for interrupting the differential of the differential mechanism 15 is provided, the differential mechanism 15 can be locked, and the vehicle It is possible to improve the running performance on rough roads.

  Further, since the first operating member 23 of the power transmission interrupting mechanism 17 and the second operating member 25 of the differential limiting interrupting mechanism 19 are actuated by one actuator 29, the first operating member 23 and the second operating member 25 are operated. There is no need to separately mount an actuator for operating the operating member 25, and the increase in size and weight of the apparatus can be suppressed.

  Therefore, the enlargement of the apparatus can be suppressed and the running performance on the rough road of the vehicle can be improved.

  Further, since the third urging member 37 having a different urging force from the first and second urging members 33 and 35 is provided, the power transmission intermittent mechanism 17 and the differential limiting intermittent mechanism are provided by one actuator 29. 19 can be activated in stages. For this reason, even on a rough road that cannot be driven in the four-wheel drive state where the power transmission interrupting mechanism 17 is connected, the actuator 29 is further operated to displace the third biasing member 37, thereby interrupting the differential restriction. By connecting the portion 27, the differential mechanism 15 is locked and the vehicle can run on a rough road.

  Further, for example, in the case where the moving distance of the pressing member 31 is controlled by a current value such as an electromagnet, a difference in the moving distance is likely to occur due to a difference in current value or environment. There is a possibility that the intermittent characteristic of the portion 27 becomes unstable. On the other hand, since the actuator 29 includes the actuator motor 39, the movement distance of the pressing member 31 can be accurately controlled by the rotation of the actuator motor 39, and the power transmission intermittent portion 21 and the differential limiting intermittent portion 27. The intermittent characteristics can be stabilized.

  As in the drive motor power transmission device according to the embodiment of the present invention, it is preferable to use a motor as an actuator in order to improve the accuracy of the movement distance of the operation member, but an electromagnet, magnetic fluid, hydraulic cylinder-piston, etc. The actuator may be in any form as long as the operation member can be moved and operated.

DESCRIPTION OF SYMBOLS 1 ... Power transmission device for drive motors 3 ... Power transmission member 5 ... Drive motor 7 ... Differential case 9 ... Pinion 11, 13 ... Side gear 15 ... Differential mechanism 17 ... Intermittent mechanism for power transmission 19 ... Intermittent mechanism for differential limitation 21 ... Power transmission intermittent portion 23... First operation member 25. Second operation member 27... Differential limiting intermittent portion 29 .. actuator 31 .. pressing member 33 .. first biasing member 35. 37 ... Third biasing member 39 ... Actuator motor (motor)

Claims (3)

A drive motor that inputs a driving force to a rotatable power transmission member, a differential case that is rotatable relative to the power transmission member, and is rotatably supported by the differential case and is rotated by the rotation of the differential case. A differential mechanism composed of a revolving pinion, a pair of side gears meshed with the pinion and capable of rotating relative to each other, and a power transmission intermittent mechanism provided between the power transmission member and the differential case for intermittently driving force. A power transmission device for a drive motor mounted in a power system different from a power system driven by another power source,
A differential limiting intermittent mechanism that interrupts the differential of the differential mechanism is provided between the differential case and one of the pair of side gears. The power transmission intermittent mechanism A power transmission interrupting portion provided between a member and the differential case; and a first operation member that is provided so as to be movable in an axial direction and intermittently operates the power transmission interrupting portion. The interrupting mechanism includes a second operating member that is integrally rotatable with the differential case and is axially movable, and a differential limiting interrupting portion provided between the second operating member and the one side gear. And
The power transmission device for a drive motor, wherein the first operation member and the second operation member are pressed and moved by a pressing member that is moved in the axial direction by an actuator. A power transmission device for a drive motor according to claim 1,
Between the differential case and the first operation member, a first urging member for urging the first operation member in a connection release direction of the power transmission intermittent portion is provided, and the differential case and the first operation member Between the second operation member, a second operation member that urges the second operation member in the disconnection direction of the differential limiting intermittent portion with an urging force substantially equal to that of the first urging member. An urging member is provided, and has a larger urging force between the first operation member and the pressing member than the first urging member and the second urging member, and the differential A power transmission device for a drive motor, characterized in that a third urging member that is displaceable when the restriction interrupting portion is connected is provided. A power transmission device for a drive motor according to claim 1 or 2,
The power transmission device for a drive motor, wherein the actuator includes a motor.

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