JP2009173282A - Power transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device facilitating easy inspection or adjustment of a motor connected to an input shaft and an output shaft. <P>SOLUTION: In the power transmission device, a rotor 13 of the motor 2 is disposed between a first shaft 27 at an input side and a second shaft 7 at an output side, and the first shaft 27, the second shaft 7 and the rotor 13 are integrally connected at least in the rotation direction. The first shaft 27 is connected to the rotor 13 and the second shaft 7 is connected to the first shaft 27. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power transmission device having a configuration in which an input-side shaft and an output-side shaft are connected to a rotor of an electric motor and torque is transmitted between the three as a whole, and a method for assembling the power transmission device It is about.

  Conventionally, as a power device for a vehicle, a device combining an internal combustion engine and an electric motor, a device using an electric motor as a power source, and the like are known. Even a vehicle using this type of power unit is mounted with a transmission for controlling the driving torque and the rotational speed of an internal combustion engine or an electric motor. One example thereof is described in Patent Document 1. The device described in Patent Document 1 is a drive device for a hybrid vehicle, in which an internal combustion engine is connected to a carrier of a planetary gear mechanism, and a first motor generator is connected to a sun gear of the planetary gear mechanism. Has been. Further, a ring gear is connected to a member on the input side of the stepped automatic transmission. The output side member of the automatic transmission is connected to the propeller shaft, and the second motor generator is connected to the propeller shaft. Therefore, in the device of Patent Document 1, the planetary gear mechanism constitutes a distribution mechanism that distributes the power output from the internal combustion engine to the first motor generator and the output side, and the distribution mechanism changes from the automatic transmission to the automatic transmission. In the process of transmitting power, torque is added or absorbed by the second motor generator. Further, this Patent Document 1 describes a configuration in which a second motor generator is connected to an input side of an automatic transmission, and an output member of the automatic transmission is connected to a propeller shaft through a gear train. .

JP 2003-127681 A

  In the device described in Patent Document 1, the second motor generator is connected to the propeller shaft via a gear pair, or the second motor generator is connected to the automatic transmission. Specifically, this is a structure in which the rotor is attached to the rotation shaft of a predetermined gear in the gear pair or the rotor is attached to the input shaft of the automatic transmission. Therefore, in the device described in Patent Document 1, when the second motor generator is assembled, the second motor generator is connected to the gear pair or the automatic transmission. Therefore, before the assembly of the entire device is completed, an inspection such as measuring the torque of the second motor generator is performed, and when making any adjustment, the gear pair and the automatic transmission are also rotated. There is a possibility that the torque by the gear pair and the automatic transmission may affect the measurement accuracy and the adjustment accuracy of the rotation angle.

  The present invention has been made paying attention to the above technical problem, and an object thereof is to provide a power distribution mechanism capable of rotating an electric motor alone during the assembly process and an assembly method thereof. is there.

  In order to achieve the above object, the rotor and the second shaft on the output side can be rotated relative to each other before the first shaft on the input side is connected to the rotor. By connecting the first shaft, the first shaft, the second shaft, and the rotor are connected in a state where torque can be transmitted. Specifically, in the first aspect of the invention, the rotor of the first electric motor is arranged between the first shaft on the input side and the second shaft on the output side, and the first shaft, the second shaft, and the rotor are at least In the power transmission device that is integrally connected in the rotation direction, the first shaft is connected to the rotor, and the second shaft is connected to the first shaft.

  According to a second aspect of the present invention, there is provided an electric continuously variable transmission according to the first aspect, wherein the gear ratio is continuously changed by an electric drive device having the first shaft as an output shaft and the rotational speed being electrically controlled. And a mechanical transmission unit capable of changing a gear ratio with the second shaft as an input shaft.

  According to a third aspect of the present invention, in the second aspect of the present invention, the mechanical transmission unit includes a mechanism that changes a transmission ratio by changing a power transmission path by mechanical means. It is a power transmission device.

  According to a fourth aspect of the present invention, in the second or third aspect of the invention, the electric continuously variable transmission unit includes an internal combustion engine, a second electric motor, and power output from the internal combustion engine, the first shaft and the second electric motor. And a differential mechanism that distributes the power to the power transmission device.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the rotor has a cylindrical portion along the rotation center axis, and the cylindrical portion is rotatable to a predetermined fixed portion via a bearing. The power transmission device is attached, and at least one of the first shaft and the second shaft is inserted into the cylindrical portion.

  The invention of claim 6 is the invention of claim 5, further comprising a case for housing the electric continuously variable transmission portion, the first electric motor, and the mechanical transmission portion, and the fixing portion is disposed inside the case. The power transmission device is formed by a partition wall provided.

  The invention of claim 7 is the invention according to any one of claims 1 to 6, wherein the first shaft is spline-fitted to the rotor, and the second shaft is spline-fitted to the first shaft. The power transmission device characterized by the above.

  According to an eighth aspect of the present invention, in the invention according to any one of the fifth to seventh aspects, the second shaft is inserted into the inner peripheral side of the cylindrical portion, and the second peripheral portion is inserted into the inner peripheral portion of the cylindrical portion. The second shaft is used for assembling the rotor by forming a small-diameter portion where the clearance between the outer peripheral surface of the shaft is smaller than the minimum clearance between the outer peripheral surface of the rotor and the inner peripheral surface of the stator. It is a power transmission device characterized by being a guide part.

  The invention according to claim 9 is the invention according to claim 8, wherein the small diameter portion is formed in a portion facing a portion closer to the intermediate portion than the tip portion of the second shaft, and the outer periphery of the tip portion of the second shaft. The power transmission device is characterized in that a spline is formed on a surface, and a spline is formed on an inner peripheral portion of an end portion of the inner peripheral portion of the cylindrical portion near the tip end portion of the second shaft.

  According to a tenth aspect of the present invention, in the ninth aspect of the invention, the spline formed at the distal end portion of the second shaft and the spline formed at the cylindrical portion substantially coincide with each other in the axial direction. It is a power transmission device characterized by having.

  The invention of claim 11 is the invention according to any one of claims 7 to 10, wherein the position where the first shaft and the rotor start to be spline-fitted, and the first shaft and the second shaft are spline-fitted. The power transmission device is characterized in that the position where the movement starts is shifted in the axial direction.

  A twelfth aspect of the present invention is the power according to any one of the sixth to eleventh aspects, wherein the second shaft passes through the partition wall and is rotatably supported by the partition wall. It is a transmission device.

  According to a thirteenth aspect of the present invention, in the invention according to any one of the sixth to twelfth aspects, the rotor further includes a fixing portion that divides the storage chamber of the first electric motor so as to face the partition wall. Both ends of the power transmission device are rotatably supported by the partition wall portion and the other fixing portion.

  According to a fourteenth aspect of the present invention, in the invention according to any one of the seventh to thirteenth aspects, a spline for connecting to the rotor is formed on the outer peripheral surface of the first shaft, and the inner peripheral surface of the first shaft is formed. Is a power transmission device in which a spline for connection with the second shaft is formed.

  According to a fifteenth aspect of the present invention, the rotor of the electric motor is disposed between the first shaft on the input side and the second shaft on the output side, and the first shaft, the second shaft, and the rotor are integrally connected at least in the rotational direction. In the assembling method of the power transmission device, the second shaft and the rotor are assembled so as to be relatively rotatable, and then the first shaft is coupled to the second shaft and coupled to the rotor. Is the method.

  According to a sixteenth aspect of the present invention, in the fifteenth aspect of the present invention, in the state where the second shaft is assembled in the case, the partition portion is assembled in the case so as to penetrate the second shaft, and the partition portion is used to The two shafts are rotatably supported, and then the rotor is fitted to the outer peripheral side of the second shaft and moved in the axial direction so that the rotor is assembled using the second shaft as a guide portion and the partition portion An assembly method of a power transmission device, wherein one end of a rotor is rotatably supported.

  The invention according to claim 17 is the invention according to claim 16, wherein the other end of the rotor is attached to the other end of the rotor by assembling another partition into the case so as to face the partition with the rotor interposed therebetween. It is the assembly method of the power transmission device characterized by rotatingly supporting by the partition part.

  The invention according to claim 18 is the invention according to claim 17, wherein the first shaft and the rotor are connected to each other by inserting the first shaft into the rotor through the other partition wall portion. A power transmission device assembling method comprising connecting a first shaft and the second shaft.

  According to the first aspect of the present invention, the first shaft, the second shaft, and the rotor of the first motor in the power transmission device are connected so as to be able to transmit torque, but in a state before the first shaft is assembled. The second shaft and the rotor are not connected. Therefore, in this state, since the rotor is rotatable with respect to the second shaft, it is possible to rotate the electric motor alone while the power transmission device is being assembled. As a result, the electric motor is inspected independently. Or can be adjusted.

  According to the second or third aspect of the invention, when the electric motor is assembled on the input side of the mechanical transmission unit, the second shaft that is the input shaft of the mechanical transmission unit and the rotor of the electric motor are not connected. In the middle of assembling the power transmission device, the electric motor can be driven alone to perform inspection and adjustment.

  According to the invention of claim 4, in the process of assembling the power transmission device having the continuously variable transmission that can control the rotational speed of the internal combustion engine by the second electric motor, the first electric motor is rotated alone to inspect and adjust it. It can be performed.

  According to the invention of claim 5, since the rotor of the first electric motor is rotatable by rotatably supporting the cylindrical portion by the predetermined fixing portion, the second shaft or the input shaft is provided on the cylindrical portion. The rotor can be rotated without interfering with the second shaft or the input shaft even in a state in which is inserted, and as a result, inspection and adjustment of the first motor can be performed easily and accurately.

  According to the sixth aspect of the present invention, the rotor can be rotatably supported by the partition part substantially integral with the case, and the first electric motor is driven independently before the first shaft or the output shaft is assembled. Inspection or adjustment can be performed.

  According to the invention of claim 7, since the first shaft is spline-fitted to each of the rotor and the second shaft, the rotor and the second shaft can be connected via the first shaft, The connecting work becomes easy.

  According to the eighth aspect of the present invention, the rotor can be assembled using the second shaft or the input shaft of the mechanical transmission unit as a guide portion, so that the rotor can be easily assembled without causing the rotor to interfere with the stator.

  According to the ninth aspect of the present invention, when the rotor is assembled, the cylindrical portion can be easily assembled without causing interference with the spline of the second shaft.

  According to the invention of claim 10, since the splines are arranged side by side in the radial direction, the torsional stress acting on the first shaft that connects the rotor and the second shaft can be reduced.

  According to the eleventh aspect of the present invention, when the first shaft is assembled, the first shaft is fitted to one of the rotor spline and the second shaft spline and then fitted to the other spline. Becomes easier.

  According to the twelfth aspect of the present invention, since the second shaft penetrates the partition wall and is rotatably supported, the second shaft can sufficiently function as a guide when the rotor is assembled.

  According to the invention of claim 13, since the rotor is rotatably supported at both ends in the axial direction, it is possible to easily inspect and adjust the first motor before the first shaft is assembled.

  According to the invention of claim 14, since the first shaft is spline-fitted to the rotor and the second shaft, and is fitted to each of the splines on both the inner and outer circumferences, the assemblability is improved and the first shaft is improved. Can reduce torsional stress.

  According to the fifteenth aspect of the invention, of the first shaft, the second shaft, and the rotor that are connected to each other, the second shaft and the rotor are first assembled so as to be relatively rotatable with each other. The motor can be rotated without interfering with the two axes. As a result, the electric motor can be driven alone to easily inspect and adjust the motor. After that, by assembling the first shaft, the first shaft is connected to the rotor and the second shaft, and as a result, the rotor and the second shaft are in a state where torque can be transmitted.

  According to the invention of claim 16, since the rotor is assembled using the second shaft as a guide portion, the rotor can be easily assembled without causing interference with the stator or the like.

  According to the invention of claim 17, the rotor can be rotatably supported in a so-called both-ends supported state.

  According to the invention of claim 18, until the first shaft is assembled, the first electric motor can be maintained in a rotatable state, and the inspection and adjustment can be performed independently. It functions as a connecting member that connects the shafts.

It is sectional drawing which shows an example of this invention. 1 is a skeleton diagram schematically showing a drive system of a hybrid vehicle including a power transmission device to which the present invention is applied. FIG. It is a graph which shows the engagement action | operation of the mechanical transmission part. It is explanatory drawing which shows a part of assembly | attachment procedure of a rotor typically. It is sectional drawing which shows the other example of this invention.

  Next, the present invention will be described based on a specific example shown in the drawings. FIG. 1 is a cross-sectional view showing a part of a power transmission device that is a subject of the present invention. The power transmission device shown here includes a mechanical transmission 1 and an electric motor 2. The transmission unit 1 and the electric motor 2 are accommodated in the case 3. The case 3 has a structure in which one end side (the left side in FIG. 1) is greatly opened, and the other end side (the right side in FIG. 1) is opened small enough to pass through an output shaft (not shown). It is divided into two storage chambers 5 and 6 by the partition 4 attached. The transmission unit 1 is disposed in the accommodation chamber 5 on the right side of FIG. 1, and the electric motor 2 is disposed in the accommodation chamber 6 on the left side of FIG.

  The transmission unit 1 is configured to change the gear ratio by changing the power transmission path, such as a stepped gear transmission mechanism or a continuously variable transmission mechanism such as a belt type or toroidal type. . An example of the stepped transmission unit 1 mainly composed of a planetary gear mechanism will be described later. The transmission unit 1 includes an input shaft 7 corresponding to the second shaft of the present invention, and the input shaft 7 penetrates the partition wall portion 4 and protrudes toward the accommodation chamber 6 side of the electric motor 2.

  The partition wall 4 is a plate-like member having a boss 8 on the center side, and is fitted and centered by a spigot 9 formed on the inner peripheral portion of the case 3. 3 is fixed. The input shaft 7 passes through the partition wall portion 4 along the central axis of the boss portion 8 of the partition wall portion 4, and is freely rotatable by the partition wall portion 4 via a bearing 11 fitted on the outer peripheral side thereof. Is retained.

  On the other hand, the electric motor 2 includes a stator (stator) 12 and a rotor (rotor) 13 disposed concentrically on the inner periphery thereof. As this electric motor 2, an appropriate type can be used, and for example, a permanent magnet type synchronous motor can be used. In that case, a coil 14 is provided on the stator 12, and a permanent magnet 15 is attached to the rotor 13. The rotor 13 includes a cylindrical portion 16 having a length close to the axial length of the coil 14 on the inner peripheral portion thereof. The input shaft 7 protrudes from the end of the rotor 13 on the partition wall 4 side to a length that reaches the vicinity of the center of the cylindrical portion 16. And the spline 17 is formed in the outer peripheral surface of the front-end | tip part of the input shaft 7. FIG. The inner diameter of the cylindrical portion 16 is sufficiently large with respect to the outer diameter of the input shaft 7, and they are not in contact with each other. A spline 18 is formed on the inner peripheral surface of the end portion of the cylindrical portion 16 opposite to the partition wall portion 4. These splines 17 and 18 are offset from each other in the axial direction.

  The storage chamber 6 in which the electric motor 2 is stored is partitioned by another partition wall 19 attached to the inner periphery of the case 3 so as to face the partition wall 4. The rotor 13 is rotatably supported by the partition walls 4 and 19 via bearings 20 and 21 fitted to both ends of the cylindrical portion 16. Therefore, these partition walls 4 and 19 correspond to the fixing part of the present invention. As described above, the inner peripheral surface of the cylindrical portion 16 of the rotor 13 and the outer peripheral surface of the input shaft 7 are sufficiently separated from each other. Therefore, when the rotor 13 is assembled and supported by the bearings 20 and 21, the rotor 13 is Can be rotated alone.

  In addition, a rotor 23 of a resolver 22 is attached to an end of the cylindrical portion 16 on the other partition wall portion 19 side, and a stator 24 is disposed on the outer peripheral side thereof so as to face each other in the radial direction. 24 is fixed to the inner surface of the other partition wall 19.

  The other partition wall portion 19 is formed with a boss portion 25 whose center axis coincides with the input shaft 7, and the boss portion 25 has an output of the power distribution mechanism 26 corresponding to the first shaft of the present invention. A shaft 27 is inserted. The output shaft 27 is a shaft for transmitting the power from the power distribution mechanism 26 to the electric motor 2 and the transmission unit 1, and its tip can be inserted into the inner peripheral side of the cylindrical portion 16, and the input shaft 7 is formed in a cylindrical shape so that it can be fitted to the outer peripheral side. A spline is formed on the inner peripheral surface on the tip side of the cylindrical portion, and the spline is fitted to the spline 17 in the input shaft 7. Further, splines are formed on the outer peripheral surface of the output shaft 27 corresponding to the splines 18 formed on the inner peripheral surface of the cylindrical portion 16 with the output shaft 27 inserted as desired on the inner peripheral side of the cylindrical portion 16. The spline is fitted to the spline 18 of the cylindrical portion 16. That is, the output shaft 27 has splines formed on the inner and outer peripheral surfaces thereof. Therefore, the rotor 13 and the input shaft 7 are connected via the output shaft 27 so that torque can be transmitted. In other words, the rotor 13 and the input shaft 7 are not connected until the output shaft 27 is assembled. The power distribution mechanism 26 will be described later.

  The oil passages 28 and 29 for supplying or discharging the lubricating oil or the hydraulic pressure to the transmission unit 1, the power distribution mechanism 26 or the bearings 11, 20, and 21 are provided inside the partition walls 4 and 19. Is formed. A hydraulic control circuit (not shown) for supplying and discharging hydraulic pressure through these oil passages 28 and 29 is attached to the lower portion of the case 3, and an oil pan (not shown) is used for controlling the hydraulic pressure. It is attached to the lower part of case 3 in the state which accommodated the circuit.

  The power transmission device shown in FIG. 1 can be mounted on a hybrid vehicle, and an example of such a configuration is shown in a skeleton diagram in FIG. The example shown here is an example configured as a so-called two-motor hybrid drive device, particularly an example configured to be mounted in the front-rear direction of the vehicle. First, the structure of the transmission unit 1 will be described. In the example shown in FIG. 2, the gear ratio between the fourth forward speed and the first reverse speed can be set by two sets of planetary gear mechanisms 30 and 31. These planetary gear mechanisms 30 and 31 may be either a single pinion type or a double pinion type. In the example shown in FIG. 2, a single pinion type planetary gear mechanism is employed. That is, the planetary gear mechanisms 30 and 31 include sun gears S1 and S2 that are external gears, ring gears R1 and R2 that are internal gears arranged concentrically on the outer peripheral side, and the sun gears S1 and S2. The carrier CA1 and CA2 holding the pinion gears disposed between the ring gears R1 and R2 and meshing with each other are configured to perform a differential action with the rotating elements.

  The carrier CA1 in the first planetary gear mechanism 30 and the ring gear R2 in the second planetary gear mechanism 31 are coupled, and the ring gear R1 of the first planetary gear mechanism 30 and the carrier CA2 of the second planetary gear mechanism 31 Therefore, these planetary gear mechanisms 30 and 31 are configured as a so-called CR-CR combined compound planetary gear mechanism.

  Three clutch mechanisms C1, C2, and C3 for selectively transmitting power to the compound planetary gear mechanism are provided. These clutch mechanisms C1, C2, and C3 are, for example, hydraulic friction engagement devices, and the first clutch mechanism C1 is disposed between the input shaft 7 and the sun gear S2 of the second planetary gear mechanism 31 described above. In addition, a second clutch mechanism C2 is disposed between the carrier CA1 of the first planetary gear mechanism 30 and the input shaft 7, and a second clutch mechanism C2 is disposed between the sun gear S1 and the input shaft 7 in the first planetary gear mechanism 30. 3 clutch mechanisms C3 are arranged.

  Further, a first brake mechanism B1 that selectively fixes the sun gear S1 in the first planetary gear mechanism 30 and a second brake mechanism B2 that selectively fixes the ring gear R2 in the second planetary gear mechanism 31 are provided. Is provided. As these brake mechanisms B1 and B2, a hydraulic multi-plate brake, a band brake or the like can be employed. A one-way clutch F1 is provided in parallel with the second brake mechanism B2. The one-way clutch F1 is engaged and rotated when the carrier CA1 in the first planetary gear mechanism 30 and the ring gear R2 in the second planetary gear mechanism 31 try to rotate in the direction opposite to the input shaft 7. Configured to stop. The output shaft 32 is connected to the carrier CA2 in the second planetary gear mechanism 31. The output shaft 32 is disposed on the same axis as the input shaft 7 described above, and protrudes from the case 3.

  Next, the power distribution mechanism 26 will be described. The power distribution mechanism 26 uses the motor / generator (M1) 34 corresponding to the second electric motor of the present invention and the transmission unit 1 to output the power output from the internal combustion engine (engine) 33. And a planetary gear mechanism. The planetary gear mechanism only needs to have a differential action by three rotating elements, and can have an appropriate configuration such as a single pinion type or a double pinion type. In the example shown in FIG. A type planetary gear mechanism is employed. The planetary gear mechanism is configured as a so-called speed increasing mechanism. The internal combustion engine 33 is connected to the carrier CA0, the motor / generator 34 is connected to the sun gear S0, and the output shaft 27 is connected to the ring gear R0. ing.

  An output shaft 27 in the power distribution mechanism 26 is connected to the input shaft 7 of the transmission unit 1, and the rotor 13 of the electric motor (M 2) 2 is connected to the output shaft 27 and the input shaft 7. The motor / generator 34 may be a generator, and the motor 2 may be a motor / generator having a power generation function. Further, the motor / generator 34 and the electric motor 2 are connected to a battery via a controller such as an inverter (not shown), and the inverter is controlled by an electronic control unit, so that a drive torque, a power generation torque, a power generation amount, and the like can be obtained. To be controlled.

  The transmission unit 1 mainly composed of the two sets of planetary gear mechanisms 30 and 31 described above includes the clutch mechanisms C1, C2, and C3, the brake mechanisms B1 and B2, and the one-way clutch F1 as shown in FIG. By combining or releasing, it is configured to set the fourth forward speed and the first reverse speed. FIG. 3 is a chart showing the engagement operation, where ◯ indicates the engaged state, the blank indicates the released state, and the 〇 mark with parentheses indicates that the power source brake (or engine brake) is applied. It shows engaging with. The clutch mechanism C1, C2, C3 and brake mechanism B1, B2 are controlled to be engaged / released by the hydraulic pressure output from the hydraulic control circuit described above.

  Next, the assembly procedure (method) of the power transmission device described above will be described. First, the components of the transmission unit 1 are sequentially inserted from the large opening side (the internal combustion engine 33 side in the vehicle-mounted state) into the case 3 before mounting the partition portions 4 and 19 described above. Assemble inside 3. Next, the input shaft 7 of the transmission unit 1 is inserted into the boss portion 8 of the partition wall portion 4, and the partition wall portion 4 is fitted to the spigot portion 9 formed on the inner peripheral portion of the case 3 and fixed by the bolt 10. To do. Thus, the accommodation chamber 5 that accommodates the transmission 1 is closed, and the input shaft 7 is rotatably supported by the boss 8 via the bearing 11.

  Next, the stator 12 in the electric motor 2 is attached to the inner periphery of the case 3. In this state, the input shaft 7 protrudes on the same axis as the stator 12. The leading end portion of the guide shaft 38 is fitted to the protruding end side of the input shaft 7 as shown in FIG. The guide shaft 38 has an outer diameter substantially equal to that of the output shaft 27 and is connected so as to extend on the same axis as the input shaft 7 that is already assembled. The rotor 13 is slidably fitted on the outer peripheral side of the guide shaft 38, and the rotor 13 is inserted along the guide shaft 38 into the inner peripheral side of the stator 12 using an appropriate jig 39. In that case, the bearing 20 is fitted in advance to the inner peripheral side of the boss portion 8 of the partition wall portion 4.

  When the rotor 13 is fed to the position where the end portion approaches the partition wall portion 4 in this way, the end portion of the cylindrical portion 16 of the rotor 13 is fitted to the bearing 20 fitted to the partition wall portion 4 and rotated. It is supported freely. This state is shown in FIG. Therefore, even if the rotor 13 includes the permanent magnet 15 and an attractive force acts between the rotor 13 and the stator 12, the rotor 13 is assembled to the stator 12 while maintaining the position substantially on the same axis. It can be avoided that 13 interferes with or is attracted to the stator 12.

  After the rotor 13 is inserted into the inner peripheral side of the stator 12 in this way, another partition wall portion 19 is inserted into the case 3 and attached to the inner peripheral surface of the case 3. In that case, the rotor 23 of the resolver 22 is mounted on the cylindrical portion 16 in advance, and the stator 24 of the resolver 22 is fixed to the inner side surface of the other partition wall portion 19 in advance. Then, by attaching the bearing 21 in advance to the outer peripheral portion of the other end portion of the cylindrical portion 16 or the inner peripheral portion of the other partition wall portion 19, the other end portion of the cylindrical portion 16 is interposed via the bearing 21. The other partition wall 19 is rotatably supported. That is, the rotor 13 is rotatably supported by the partition walls 4 and 19 through the bearings 20 and 21. In this state, the rotor 13 and the input shaft 7 are not connected, and the rotor 13 is rotatable with respect to the input shaft 7. Therefore, it is possible to rotate the rotor 13 independently, so that the electric motor 2 can be driven in a single state separated from the transmission unit 1 and the inspection can be performed. Further, the resolver 22 can be adjusted.

  Next, the output shaft 27 of the power distribution mechanism 26 assembled in advance is inserted into the inner peripheral side of the cylindrical portion 16 through the other partition wall portion 19. Since the tip end portion of the output shaft 27 is formed in a cylindrical shaft shape as described above, and a spline is formed on the inner peripheral side thereof, the spline is fitted to the spline 17 of the input shaft 7, and the output shaft 27 And the input shaft 7 are coupled so as to transmit torque. At the same time, the spline formed on the outer peripheral surface on the base end side (left side in FIG. 1) of the output shaft 27 is fitted into the spline 18 formed on the inner peripheral surface of the cylindrical portion 16, and the output shaft 27 is The rotor 13 is connected to be able to transmit torque. Eventually, the output shaft 27, the input shaft 7, and the rotor 13 are connected so as to be able to transmit torque.

  Therefore, in the configuration shown in FIG. 1 described above, the rotor 13 and the input shaft 7 are not connected in a state where the rotor 13 is assembled to the inner peripheral side of the stator 12, so the electric motor 2 is rotated alone. The inspection and adjustment can be performed, so that the accuracy of the inspection and adjustment of the electric motor 2 is improved and the operation is facilitated.

  Next, another example of the present invention will be described. FIG. 5 shows that the protruding length of the input shaft 7 is increased, the spline fitting position between the output shaft 27 and the input shaft 7, and the spline between the output shaft 27 and the rotor 13. This is an example in which the fitting positions are substantially aligned in the axial direction. Specifically, the input shaft 7 extends to near the end of the cylindrical portion 16 on the other partition wall 19 side, and substantially faces the spline 18 on the inner surface of the cylindrical portion 16 (that is, in the axial direction). A spline 17 is formed on the outer peripheral surface whose positions substantially coincide. Note that the left end of the spline 17 of the input shaft 7 in FIG. 5 is shifted in the axial direction with respect to the left end of the spline 18 of the cylindrical portion 16 in FIG. In other words, the position where the spline of the output shaft 27 starts to fit is shifted in the axial direction. This is a configuration in which the output shaft 27 starts to be spline fitted to one of the cylindrical portion 16 and the input shaft 7 and then starts to be spline fitted to the other, whereby the output shaft 27 is assembled. Becomes easier.

  In accordance with the configuration of the input shaft 7 described above, the output shaft 27 is shorter than the above-described example, and the tip thereof is located between the spline 18 of the cylindrical portion 16 and the spline 17 of the input shaft 7. Splines are formed on both inner and outer peripheral sides of the cylindrical tip portion of the output shaft 27, and are splined to the cylindrical portion 16 and the input shaft 7.

  On the other hand, small diameter portions 16 </ b> A are formed at predetermined intervals in two locations on the inner peripheral portion of the cylindrical portion 16 and closer to the other end than the spline 18. This is for assembling the rotor 13 using the input shaft 7 as a guide member, and the clearance (clearance) C1 between the inner peripheral surface of the small diameter portion 16A and the outer peripheral surface of the input shaft 7 is the outer periphery of the rotor 13. It is configured to be smaller than the minimum gap (clearance) C2 between the surface and the inner peripheral surface of the stator 12. That is, when the position of the rotor 13 in the radial direction is shifted when the rotor 13 is assembled, the small diameter portion 16A comes into contact with the input shaft 7 and the position in the radial direction is restricted. As a result, the rotor 13 contacts or interferes with the stator 12. It is supposed not to. The other configurations are the same as those shown in FIG. 1, and the same reference numerals as those in FIG.

  Therefore, even in the case of the configuration shown in FIG. 5, the rotor 13 and the input shaft 7 are not connected in a state where the transmission unit 1 is assembled and the electric motor 2 is assembled. It is possible to perform the inspection, adjustment of the resolver 22 and the like in a separated state, that is, drive independently. In the configuration shown in FIG. 5, the input shaft 7 extends to almost the entire length of the stator 12. Therefore, when the rotor 13 is assembled, the cylindrical portion 16 is fitted to the input shaft 7, and the input shaft 7 is Assembling can be performed as a guide portion, and assembling workability of the rotor 13 can be improved. Further, since the splines formed on the inner and outer peripheral surfaces of the output shaft 27 are at substantially the same position in the axial direction, the torsional stress acting on the output shaft 27 can be reduced.

  In the above specific example, the example in which the present invention is applied to the power transmission device in the hybrid drive device has been shown. However, the present invention is not limited to the above specific example, and the power transmission device in the electric vehicle, etc. Applicable to other power transmission devices. Further, the transmission unit in the present invention is not limited to the planetary gear type stepped transmission mechanism described above, and may be replaced with a transmission mechanism having no transmission function. Furthermore, the electric motor of the present invention is not limited to a permanent magnet type electric motor, and may be another appropriate type of electric motor. The mechanism for transmitting torque in the present invention is not limited to a spline, and may be a means for engaging so as to be integrated with each other in the rotational direction, such as a serration or a slide key.

  DESCRIPTION OF SYMBOLS 1 ... Transmission part, 2 ... Electric motor, 3 ... Case, 4 ... Partition part, 5, 6 ... Accommodating chamber, 7 ... Input shaft, 12 ... Stator (stator), 13 ... Rotor (rotor), 16 ... Cylindrical part 16A ... Small diameter part 17, 18 ... Spline, 19 ... Other partition part, 20, 21 ... Bearing, 26 ... Power distribution mechanism, 27 ... Output shaft, 33 ... Internal combustion engine (engine), 34 ... Motor generator.

Claims (18)

A power transmission device in which a rotor of a first electric motor is arranged between a first shaft on an input side and a second shaft on an output side, and the first shaft, the second shaft, and the rotor are integrally connected at least in the rotational direction. In
The power transmission device, wherein the first shaft is coupled to the rotor, and the second shaft is coupled to the first shaft.   An electric continuously variable transmission section having a gear ratio continuously changed by an electric drive device having the first shaft as an output shaft and the rotational speed being electrically controlled; and a gear ratio having the second shaft as an input shaft. The power transmission device according to claim 1, further comprising a mechanical transmission unit that can be changed.   The power transmission device according to claim 2, wherein the mechanical transmission unit includes a mechanism that changes a transmission ratio by changing a power transmission path by mechanical means.   The electric continuously variable transmission unit includes an internal combustion engine, a second electric motor, and a differential mechanism that distributes power output from the internal combustion engine to the first shaft and the second electric motor. Item 4. The power transmission device according to Item 2 or 3.   The rotor has a cylindrical portion along the rotation center axis, and the cylindrical portion is rotatably attached to a predetermined fixing portion via a bearing, and at least one of the first shaft and the second shaft is The power transmission device according to any one of claims 1 to 4, wherein the power transmission device is inserted into the cylindrical portion.   The electric continuously variable transmission unit, the first electric motor, and the mechanical transmission unit are further included, and the fixing unit is formed by a partition provided inside the case. The power transmission device according to claim 5.   The power transmission device according to any one of claims 1 to 6, wherein the first shaft is spline-fitted to the rotor, and the second shaft is spline-fitted to the first shaft.   The second shaft is inserted on the inner peripheral side of the cylindrical portion, and a gap between the outer peripheral surface of the rotor and the outer peripheral surface of the rotor is formed in the inner peripheral portion of the cylindrical portion. 8. The method according to claim 5, wherein the second shaft serves as a guide for assembling the rotor by forming a small-diameter portion that is smaller than the minimum gap between the inner peripheral surface and the rotor. A power transmission device according to claim 1.   The small-diameter portion is formed in a portion facing a portion closer to the intermediate portion than the tip portion of the second shaft, and a spline is formed on the outer peripheral surface of the tip portion of the second shaft, and further, the inner periphery of the cylindrical portion The power transmission device according to claim 8, wherein a spline is formed on an inner peripheral portion of an end portion of the portion near the tip portion of the second shaft.   10. The power transmission according to claim 9, wherein the spline formed at the distal end portion of the second shaft and the spline formed at the cylindrical portion substantially coincide with each other in the axial direction. apparatus.   The position at which the first shaft and the rotor start to be spline-fitted and a position at which the first shaft and the second shaft start to be spline-fitted are shifted in the axial direction. The power transmission device according to any one of Items 10 to 10.   The power transmission device according to claim 6, wherein the second shaft passes through the partition wall and is rotatably supported by the partition wall.   The rotor further includes another fixing portion that divides the storage chamber of the first motor so as to face the partition wall, and the rotor is rotatably supported at both ends of the cylindrical portion by the partition wall and the other fixing portion. The power transmission device according to claim 6, wherein the power transmission device is provided.   A spline for connecting with the rotor is formed on the outer peripheral surface of the first shaft, and a spline for connecting with the second shaft is formed on the inner peripheral surface of the first shaft. The power transmission device according to any one of claims 7 to 13. An assembly of a power transmission device in which a rotor of an electric motor is disposed between a first shaft on an input side and a second shaft on an output side, and the first shaft, the second shaft, and the rotor are integrally connected at least in the rotational direction. In the method
After assembling the second shaft and the rotor so as to be relatively rotatable, the first shaft is coupled to the second shaft and is coupled to the rotor.   In the state where the second shaft is assembled in the case, a partition portion is assembled in the case so as to penetrate the second shaft, and the second shaft is rotatably supported by the partition portion, and then the rotor is The rotor is assembled with the second shaft as a guide portion by being fitted to the outer peripheral side of the second shaft and moved in the axial direction, and one end portion of the rotor is rotatably supported by the partition portion. The method for assembling the power transmission device according to claim 15.   The other end portion of the rotor is rotatably supported by the other partition wall portion by assembling the other partition wall portion inside the case so as to face the partition wall portion with the rotor interposed therebetween. The method for assembling the power transmission device according to claim 16.   The first shaft and the rotor are connected by inserting the first shaft through the other partition wall into the rotor, and the first shaft and the second shaft are connected. A method for assembling the power transmission device according to claim 17.

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