JP3620389B2 - Automatic transmission mounting structure for hybrid vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in an automatic transmission mounting structure of a hybrid vehicle, and more particularly to a combination of a torque converter and a motor generator.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, automatic transmissions for vehicles have been widely used with a torque converter, and a drive plate coupled to an output shaft of an engine and a front case of the torque converter are coupled. JP-A-10201012, JP-A-11-94048, JP-A-8-233064, and the like are known.
[0003]
[Problems to be solved by the invention]
By the way, when a hybrid vehicle is configured by interposing a motor generator between an automatic transmission provided with a torque converter and an engine, the torque converter is coupled to the motor generator.
[0004]
If the motor generator has the same output, the one with a large outer diameter can be shortened in the axial direction and the vehicle can be mounted on the vehicle better than the one with a large overall length. There is a problem that a space for assembling the drive plate to be fastened is required.
[0005]
That is, as shown in FIG. 7, the crankshaft 2 of the engine 1 and the rotor 4 of the motor generator 3 are coupled, and the drive plate 8 ′ is assembled to the rotor 4 in advance, and then the casing 20 of the automatic transmission is mounted on the motor. Fastened to the generator 3.
[0006]
A tool such as a wrench is inserted through an opening 21 ′ provided on the side surface of the casing 20, and a nut 91 is fastened to a bolt 90 projecting from the front case 6 of the torque converter 5. Torque converter 5 is coupled via drive plate 8.
[0007]
However, in order to connect the drive plate 8 ′ and the front case 6 of the torque converter 5, an opening 21 ′ for inserting a tool and fastening the nut 91 is necessary in the casing 20 of the automatic transmission. Thus, there is a problem that the axial dimension of the drive system is increased by the amount corresponding to the opening, and the mountability on the vehicle is reduced.
[0008]
Further, when the casing 20 is coupled to the motor generator 3 having a large outer diameter, the through hole provided in the drive plate 8 ′ must be inserted into the bolt 90 protruding from the front case 6. Since the casing 20 is coupled to the motor generator 3 while positioning the through holes of the plate 8 ', there is a problem that workability is lowered.
[0009]
Therefore, the present invention has been made in view of the above problems, and when the motor generator and the torque converter are coupled via a drive plate, while suppressing an increase in the axial dimension of the automatic transmission, The purpose is to perform assembly work easily and reliably.
[0010]
[Means for Solving the Problems]
The first invention includes a motor generator disposed between the engine and the automatic transmission, a torque converter housed in the automatic transmission, and a drive plate for coupling the torque converter and the rotor of the motor generator. In the automatic transmission mounting structure of the hybrid vehicle in which the casing of the automatic transmission is coupled to the motor generator,
One of the drive member and the rotor is provided with one of a cylindrical member and a shaft portion having splines that are fitted to each other, and the other of the drive plate and the rotor is provided with the other of the cylindrical member and the shaft portion. Displacement restricting means for restricting the axial displacement of the cylindrical member and the shaft portion is provided, and the displacement restricting means connects the casing of the automatic transmission to the motor generator, and then attaches a bolt whose tip is formed in a rod shape to the casing. It is fastened to the screw hole provided in the cylindrical part from the side, and the tip of the bolt is engaged with an annular groove provided in the shaft part. The drive plate is fastened to the torque converter side in advance. After that, it is splined with the rotor.
[0013]
【The invention's effect】
Therefore, in the first invention, the drive plate is fastened to the torque converter in advance, and when the casing of the automatic transmission is fastened to the rotor of the motor generator, the drive plate and the rotor are spline-coupled. As shown in the example, in the narrow space between the drive plate and the motor generator, it is not necessary to fasten the drive plate to the torque converter, and the workability can be greatly improved. By reducing the size and the like, the axial dimension of the drive system combining the automatic transmission and the motor generator can be reduced.
[0014]
Further, by fixing the axial position of the drive plate and the rotor by the displacement regulating means, the drive plate and the rotor are coupled in the axial direction in addition to the coupling in the rotational direction by the spline. Even when a motor generator having a large outer diameter and an automatic transmission are combined, the reliability of the drive system can be improved.
[0015]
Furthermore, since the displacement restricting means is assembled from the opening provided on the side of the casing, the space for assembling the automatic transmission and the motor generator can be greatly reduced, and the drive combining the motor generator and the automatic transmission. The increase in the axial dimension of the system can be suppressed, and the mountability to the vehicle can be improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0017]
FIG. 1 shows a motor generator 3 interposed between a casing 20 of an automatic transmission having a torque converter 5 and an engine 1.
[0018]
The rotor 4 of the motor generator 3 is coupled to the crankshaft 2 of the engine 1, and the rotor 4 and the crankshaft 2 are fastened by a bolt 43 that penetrates the rotor 4 in the axial direction. The motor generator 3 and the engine 1 are also fastened by bolts (not shown).
[0019]
On the other hand, a torque converter 5 is housed in an opening portion of the casing 20 of the automatic transmission that is fastened to the motor generator 3, and the front case 6 coupled to the pump 7 has an end surface facing the motor generator 3. The weld nut 12 is fixed at a predetermined position in the circumferential direction. The opening side of casing 20 is fastened to motor generator 3 with a bolt or the like (not shown).
[0020]
The front case 6 is provided with a shaft 9 that fits into a hole 40 </ b> A formed in the axial center of the rotor 4.
[0021]
A disc-shaped drive plate 8 interposed between the front case 6 and the motor generator 3 couples the rotor 4 and the torque converter 5.
[0022]
The drive plate 8 has a through hole 80 through which the shaft 9 of the front case 6 is inserted on the axial center side, and a through hole 81 at a position that can face the weld nut 12 in the circumferential direction on the outer peripheral side.
[0023]
The through hole 81 formed on the outer peripheral side of the drive plate 8 is opposed to the weld nut 12, and then the bolt 43 is inserted, and the bolt 43 is screwed into the weld nut 12 of the front case 6. 5.
[0024]
A sleeve 10 projects from the peripheral edge of the through hole 80 formed in the axis of the drive plate 8 toward the rotor 4.
[0025]
On the other hand, a sleeve 40 protrudes toward the drive plate 8 from the periphery of the hole 40A formed in the shaft center of the rotor 4, and the spline 41 formed on the inner periphery of the sleeve 40 and the outer periphery of the sleeve 10 of the drive plate 8 are provided. The splines 11 formed in the above are engaged, and the drive plate 8 and the rotor 4 are coupled in the rotational direction.
[0026]
The sleeve 40 has a flange at the base end and is fastened to the rotor 4 by a bolt 43 that couples the rotor 4 to the crankshaft 2.
[0027]
Next, in the sleeve 40 of the rotor 4 and the sleeve 10 of the drive plate 8 coupled in the rotational direction, through holes 14 and 42 having substantially the same inner diameter in the radial direction are formed as shown in FIGS. The through holes 14 and 42 are fitted with spring pins 15 (displacement restricting means) to determine the axial positions of the sleeves 10 and 40.
[0028]
As shown in FIG. 3, the spring pin 15 has a “C” -shaped cross section, and after being pushed into the through holes 14 and 42, a force to expand in the outer diameter direction acts. Even if the sleeves 10 and 40 rotate, they do not fall off.
[0029]
As shown in FIG. 1, an opening 21 into which the spring pin 15 can be assembled is formed through the casing 20 facing the insertion position of the spring pin 15.
[0030]
The opening 21 is formed in such a size that the spring pin 15 supported by a jig or a tool can be inserted from the radial direction of the sleeves 10 and 40.
[0031]
Next, the operation will be described.
[0032]
As for the assembly of the automatic transmission and the motor generator 3, first, the motor generator 3 is assembled to the engine 1.
[0033]
Further, a drive plate 8 is fastened to the front case 6 also in the torque converter 5 of the automatic transmission. Since the mounting operation of the drive plate 8 can be performed by the automatic transmission alone, it can be performed much more easily than the conventional example of FIG.
[0034]
Next, the motor generator 3 and the casing 20 are opposed to each other, and the splines 11 and 41 of the splines 11 and 41 are arranged so that the through hole 42 provided in the sleeve 40 of the rotor 4 and the through hole 14 provided in the sleeve 10 of the drive plate 8 face each other. The teeth 20 are aligned and the casing 20 is fastened to the rotor 4 while the shaft 9 and the sleeve 10 of the drive plate 8 are inserted into the hole 40 </ b> A and the sleeve 40 of the rotor 4. Note that the rotor 4 and the shaft 9 are positioned so that the through holes 14 and 42 face the opening 21 of the casing 20 when the teeth of the splines 11 and 41 are aligned.
[0035]
Finally, the drive plate 8 coupled to the front case 6 is driven in the rotational direction and the axial direction of the rotor 4 by driving the spring pin 15 supported by a tool or the like from the opening 21 provided on the side of the casing 20 from the radial direction. Combined with
[0036]
Therefore, when the drive plate 8 is fastened to the torque converter 5 in advance and the casing 20 of the automatic transmission is fastened to the rotor 4, the rotor 4 of the drive plate 8 is splined. As shown, it is possible to fasten the drive plate 8 to the torque converter 5 with a narrow gap between the drive plate 8 and the motor generator 3, and the workability can be greatly improved.
[0037]
Furthermore, since the axial position of the drive plate 8 and the rotor 4 is determined by the spring pin 15 inserted in the radial direction from the opening 21 provided on the side of the casing 20, the automatic transmission and the motor generator 3 are The space for assembly can be greatly reduced, the increase in the axial dimension of the drive system combining the motor generator 3 and the automatic transmission can be suppressed, and the mountability to the vehicle can be improved, and the drive plate 8 and the rotor 4 are coupled in the axial direction in addition to the spline coupling, so there is no rattling or the like, and the reliability of the drive system combining the motor generator 3 having a large outer diameter and the automatic transmission is improved. It becomes possible to make it.
[0038]
FIG. 4 shows a second embodiment, in which the spring pin 15 of the first embodiment is replaced with a bolt 16 having a reamer shape (rod shape) at the tip, and the through hole 14 of the sleeve 10 is replaced with an annular groove 17. The through hole 42 of the sleeve 40 is replaced with a screw hole 44, and other configurations are the same as in the first embodiment.
[0039]
In this case, there is no need to match the circumferential relative positions of the sleeves 10 and 40 to be splined together, and the bolt 16 is screwed into the screw hole 44 from the radial direction so that the end of the bolt 16 is engaged with the annular groove 17. By combining, the axial position of the sleeve 40 of the rotor 4 and the sleeve 10 of the drive plate 8 can be determined, and the work of assembling the casing 20 to the motor generator 3 can be further facilitated.
[0040]
FIG. 5 shows a third embodiment, in which the sleeve 40 of the rotor 4 and the sleeve 10 of the drive plate 8 shown in the first embodiment are positioned in the axial direction by a circlip formed of a flexible member. 18 (or snap ring), and other configurations are the same as those in the first embodiment.
[0041]
The spline 11 formed on the outer periphery of the sleeve 10 of the drive plate 8 has an annular groove 11A formed at a predetermined position in the axial direction, while the spline 41 formed on the inner periphery of the sleeve 40 of the rotor 4 also has a shaft. An annular groove 41A is formed in a predetermined direction.
[0042]
Then, a circlip 18 formed of an annular member is attached to the annular groove 11 </ b> A of the sleeve 10. Further, a tapered portion 41B for guiding the circlip 18 is formed at the end of the spline 41.
[0043]
In this case, when the sleeves 10 and 40 are relatively displaced in the axial direction to be splined, the circlip 18 is first compressed in the direction of reducing the outer diameter by the tapered portion 41B of the spline 41, and the spline 41 When the annular grooves 11A and 41A reach a position where the annular grooves 11A and 41A face each other after entering between the tooth tips of the spline 11 and the tooth bottom of the spline 11, the circlip 18 expands the outer diameter, and the axial displacement of the annular grooves 11A and 41A Therefore, the axial positions of the sleeves 10 and 40 can be determined.
[0044]
Therefore, in the operation of assembling the casing 20 to the motor generator 3, the axial position of the sleeves 10, 40 is determined simply by attaching the circlip 18 in advance to the annular groove 11 </ b> A of the sleeve 10 and spline coupling with the sleeve 40. Thus, work from the side of the casing 20 becomes unnecessary, and workability can be greatly improved.
[0045]
The circlip 18 may be mounted in advance in an annular groove 41A formed in the spline 41 on the inner periphery of the sleeve 40. In this case, a tapered portion may be provided at the end of the spline 11.
[0046]
In addition, when positioning a member that performs spline coupling in the axial direction as described above, a circlip that is attached to one side in advance is, for example, “Primera Primera Camino Maintenance Manual” (September 1995 Nissan) As shown on pages DS10 and DS7 of “Automobile Co., Ltd.”, the spline connecting portion of the drive shaft and the transaxle is known.
[0047]
FIG. 6 shows the fourth embodiment, in which the circlip 18 shown in the third embodiment is replaced with a circlip 19 that can be expanded in the axial direction of the annular grooves 11A and 41A, and the other configuration. Is the same as in the third embodiment.
[0048]
In this case, after the sleeves 10 and 40 are splined together, the circlip 19 tends to expand in the axial direction, so the annular grooves 11A and 41A are fixed without rattling in the axial direction, and the axial position is positioned. It becomes possible to carry out more accurately.
[0049]
In the above embodiment, the rotor 4 and the drive plate 8 are provided with the sleeves 10 and 40, respectively, but although not shown, the shaft 9 of the front case 6 is eliminated and the sleeve 10 is replaced with a shaft (shaft). Alternatively, the shaft provided on the rotor 4 may be engaged with the inner periphery of the sleeve 10 of the drive plate 8.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of main parts of an automatic transmission and a motor generator showing an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view showing a combined state of a rotor and a sleeve of a drive plate.
FIG. 3 is a cross-sectional view of a spring pin.
FIG. 4 is an enlarged cross-sectional view showing a coupling state of a rotor and a sleeve of a drive plate according to a second embodiment.
FIG. 5 is an enlarged sectional view showing a coupling state of a rotor and a sleeve of a drive plate according to a third embodiment.
FIG. 6 is an enlarged sectional view showing a coupling state of a rotor and a sleeve of a drive plate according to a fourth embodiment.
FIG. 7 is a schematic diagram showing a state of assembling an automatic transmission including an engine, a motor generator, and a torque converter according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 3 Motor generator 4 Rotor 5 Torque converter 6 Front case 8 Drive plate 10 Sleeve 11 Spline 11A Annular groove 12 Weld nut 13 Bolt 14 Through hole 15 Spring pin 16 Bolt 17 Groove 18, 19 Circlip 20 Casing 40 Sleeve 41 Spline 41A Annular groove 41B Taper portion 42 Through hole 43 Bolt 44 Screw hole

Claims (1)

A motor generator disposed between the engine and the automatic transmission;
A torque converter housed in an automatic transmission;
In the automatic transmission mounting structure for a hybrid vehicle, which includes a drive plate for connecting the torque converter and the rotor of the motor generator, and connecting the casing of the automatic transmission to the motor generator.
One of the drive member and the rotor is provided with one of a cylindrical member and a shaft portion having splines that are fitted to each other, and the other of the drive plate and the rotor is provided with the other of the cylindrical member and the shaft portion. , Provided with a displacement regulating means for regulating the axial displacement of the cylindrical member and the shaft portion,
After the casing of the automatic transmission is connected to the motor generator, the displacement restricting means is fastened to a screw hole provided in the cylindrical portion from the side of the casing with a bolt having a tip formed in a rod shape, and is provided in the shaft portion. It is configured by engaging the tip of the bolt with an annular groove,
An automatic transmission mounting structure for a hybrid vehicle, wherein the drive plate is pre-fastened to the torque converter side and then splined to the rotor.

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