JP3955874B2 - Prime mover - Google Patents

Description

  The present invention relates to a technique for simplifying a hydraulic oil supply path of a torque converter in a hybrid prime mover in which an electric motor is disposed between a torque converter and a transmission for compactness.

There exists a thing of patent document 1 as a hybrid type prime mover provided with the internal combustion engine, the torque converter, the electric motor, and the transmission.
JP 2004-84679 A

However, in the thing of patent document 1, since the internal combustion engine and the motor were directly connected, there existed a problem that the impact at the time of these output unification was large.
Therefore, it is considered that the impact can be mitigated if the internal combustion engine and the motor are connected via a torque converter that transmits power by the action of fluid. However, since the transmission must be disposed away from the torque converter, it is difficult to supply the transmission oil as hydraulic oil into the torque converter.

  The present invention has been made in view of the above-described conventional problems. With a simple configuration, oil for a transmission can be supplied as a working oil into a torque converter located away from the transmission. An object of the present invention is to provide a hybrid prime mover that realizes a configuration in which an internal combustion engine and a motor are connected via a torque converter, thereby reducing the impact when the internal combustion engine and the motor are combined. And

  Therefore, the present invention provides an internal combustion engine, a liquid torque converter connected to the output shaft of the internal combustion engine, a motor connected to the output shaft of the torque converter, and a speed change connected to the rotation shaft of the motor. And an oil passage that supplies oil for the transmission into the torque converter through the inside of the rotating shaft of the motor.

  With the above configuration, by supplying oil from the transmission to the torque converter through the inside of the motor rotation shaft, it is possible to supply the torque converter at a position away from the transmission with a simple configuration. As a result, the internal combustion engine and the motor can be connected via the torque converter, and the impact at the time of output combination of the internal combustion engine and the motor is reduced.

Hereinafter, embodiments of the present invention will be described.
As shown in FIG. 1, the present embodiment has an internal combustion engine 2, a torque converter 4, an electric motor 6, and a transmission 8 as main prime mover elements, the torque converter 4, the transmission 8, The hybrid motor for traveling is provided with a motor 6 therebetween.
The internal combustion engine 2 transmits the driving force to the motor 6 via the torque converter 4. In addition, when the rotational speed of the internal combustion engine 2 becomes a certain value or more, the output is directly transmitted from the internal combustion engine 2 to the transmission 8 without using the fluid in the torque converter 4 (lockup). It is good to do.

The transmission 8 is supplied with driving force from the motor 6, and the output of the transmission 8 is transmitted to wheels (not shown) via an axle (not shown).
The motor 6 includes a substantially annular stator 10 and a rotor 12 that can rotate inside the stator 10, and is housed and supported in a motor housing 14 that covers the outer periphery of the stator 10. The rotor 12 includes a rotor main body 12a, and cylindrical rotating shafts 16 and 18 protruding from the side surfaces of the rotor main body 12a on the left side (internal combustion engine 2 side) and the right side of the figure (transmission 8 side). The rotary shafts 16 and 18 are respectively supported by bearings 20 and 22 attached in the motor housing 14 in the vicinity of the tip portions thereof. The gap between the motor housing 14 and the rotary shaft 18 is sealed by an annular oil seal 23 disposed at a position between the bearing 22 and the rotor body 12a.

The stator 10 includes a plurality of coils 24 arranged in an annular shape around the rotation shafts 16 and 18 with both end portions protruding from the left and right side surfaces, respectively. On the other hand, in the rotor body 12a, a plurality of magnets (permanent magnets) 26 are embedded in a portion close to the stator 10.
A cavity 28 is formed close to the magnet 26 on the inner peripheral side of the magnet 26 inside the rotor body 12a. Further, the left and right side walls on the outer side of the rotating shafts 16 and 18 of the rotor body 12a are provided with protruding portions 12b protruding outwardly, and the protruding portion 12b is formed with a jet nozzle 12c communicating with the cavity 28, The terminal end of the fountain nozzle 12 c is opened toward the stator 10.

The rotary shafts 16 and 18 communicate with the cavity 28 to form holes 30 and 32 penetrating in the axial direction, respectively, and an inner peripheral spline 18a is formed on the peripheral wall of the hole 32 as shown in FIG. Yes.
Also, a linkage member 34 having a cylindrical shape with both ends open and having an outer peripheral surface and an inner peripheral surface splined is provided, and the linkage member 34 is attached by fitting the outer peripheral spline to the inner peripheral spline 18a. ing.

  The main drive shaft 36 as the input shaft of the transmission 8 has a spline 36a formed on the outer peripheral surface of the left end portion. The left end portion of the main drive shaft 36 is inserted into the hole 32 of the rotary shaft 18, and the spline 36 a is fitted to the right side portion of the inner peripheral spline of the linkage member 34. Rotate together.

On the right side of the linkage member 34, an annular gap 38 is formed between the inner peripheral surface of the rotary shaft 18 and the main drive shaft 36. Further, as shown in FIG. 2, a part of the inner peripheral surface of the rotary shaft 18 is notched in a groove shape extending in the axial direction, and a plurality of oil holes 40 are formed so as to communicate the cavity 28 and the annular gap 38. Is formed.
On the other hand, an oil passage 36b is formed in the main drive shaft 36 along its central axis.

  The relay shaft 42 is an output shaft of the torque converter 4, and a spline 42 a is formed on the outer peripheral surface of the right end portion thereof. The relay shaft 42 is inserted into the hole 32 through the hole 30, and the spline 42 a is fitted to the left side portion of the inner peripheral spline of the linkage member 34. As a result, the relay shaft 42 is connected to the main drive shaft 36, and the rotor 12, the main drive shaft 36, and the relay shaft 42 rotate integrally. In this way, the output of the torque converter 4 and the output of the motor 6 are combined at the linkage member 34.

An annular gap 44 is formed between the inner peripheral surface of the rotating shaft 16 and the outer peripheral surface of the relay shaft 42.
On the other hand, an oil passage 42b is formed through the relay shaft 42 along the central axis thereof. The oil passage 42 b communicates with the oil passage 36 b and the inside of the torque converter 4.
The shroud member 46 has a flange portion 46a orthogonal to the axial direction, and a cylindrical tube portion 46b protruding in the axial direction (left direction) from the flange portion 46a, and the flange portion 46a has a plurality of bolts on the inner wall of the motor housing 14. It is fixed by fastening 47. The left and right ends of the cylindrical portion 46b are opened, and the relay shaft 42 is rotatably inserted in the cylindrical portion 46b in a penetrating state. The left end portion of the relay shaft 42 protrudes into the torque converter 4 from the left end portion of the cylindrical portion 46 b and receives supply of output from the output impeller of the torque converter 4.

A plurality of oil holes 46c are formed so as to communicate with the annular gap 44 and the torque converter 4 through the flange portion 46a in the axial direction. An oil seal 48 that seals oil between the oil hole 46 c and the torque converter 4 is disposed at the boundary between the motor housing 14 and the torque converter 4.
Further, an oil pump 52 that engages with the main drive shaft 36 and is driven to rotate in a position close to the motor housing 14 in the front gear housing 50 that houses the transmission 8 and supplies oil to the annular gap 38 is provided. Is provided. The oil pump 52 is also used for hydraulic control of the transmission 8 when performing shift control, lubrication of gears of the transmission 8, and the like.

Next, the operation of this embodiment will be described.
In the present embodiment, it is possible to cut off the energization of the coil 24 of the motor 6 and operate with the driving force of the internal combustion engine 2 alone. The operation at the time of both internal combustion engines 2 will be described.
First, alternating voltages having different phases are applied to the plurality of coils 24 in response to an operation command to the motor 6, and a rotating magnetic field is generated in the stator 10, and this rotating magnetic field acts on the magnet 26 to cause the rotor body 12a to move. Rotating drive. Thereby, the main drive shaft 36 is also driven.

  As the motor 6 is driven, the oil pump 52 is driven, and the oil discharged from the oil pump 52 is supplied to the cavity 28 through the annular gap 38 and the oil hole 40. As described above, since the rotor 12 and the main drive shaft 36 are directly connected without providing a clutch therebetween, the oil that supplies oil from the transmission 8 side to the cavity 28 via the rotary shaft 18 is provided. The passage can be easily formed.

The oil that is guided to the cavity 28 and fills the cavity 28 takes heat from the wide wall surface of the cavity 28, so that the rotor body 12 a is efficiently cooled from the inside. Thereby, with a simple configuration, the magnet 26 whose temperature has been raised by the operation of the motor 6 is effectively cooled, the magnetic force deterioration due to overheating of the magnet 26 can be avoided more reliably, and the performance deterioration of the motor 6 can be suppressed.
A conventional hybrid prime mover generally has a configuration in which a motor and a transmission are connected via a clutch. In such a configuration, for the purpose of supplying oil for the transmission to the rotor of the motor, there has been an attempt to arrange an oil passage that bypasses the clutch and communicates between the transmission side and the inside of the rotor body. Such an oil passage has not been realized because the arrangement is complicated.

  However, the applicant of the present invention, at the time of shifting, causes the motor 6 so that the rotational speed of the gear on the transmission input shaft (main drive shaft 36) side approaches the rotational speed of the gear on the transmission output shaft side meshing with the gear. In addition, the technology for meshing these two gears was developed after controlling the rotation speed of the gears, and it became possible to perform a smooth shift without torque shock without providing a clutch. For this reason, the clutch between the motor and the transmission can be omitted as in the present embodiment, and the motor and the transmission can be directly connected to reduce the size of the prime mover.

  In the present embodiment, by applying a technique that omits the clutch, the output shaft (rotary shaft 18) of the motor 6 is directly connected to the rotary shaft 18 of the motor 6 and the main drive shaft 36 of the transmission 8. On the other hand, an oil passage that allows the transmission 8 and the rotor body 12a to communicate with each other can be formed. For this reason, the oil for the transmission 8 is supplied to the cavity 28 in the rotor main body 12a through the inside of the rotating shaft 18, and can be used for cooling the rotor main body 12a. Without providing such a complicated configuration, it is possible to effectively prevent magnetic force deterioration due to cooling of the magnet 26 with a simpler configuration.

  Part of the oil that has reached the cavity 28 moves toward the fountain nozzle 12c due to the centrifugal force accompanying the rotation of the rotor 12, thereby increasing the oil pressure in the fountain nozzle 12c. Then, the oil is ejected from the end of the jet nozzle 12c to the outside of the rotating track, and collides with the coil 24 that is overheated by the operation of the motor 6. Thus, with a simple configuration, the coil 24 is cooled by oil, and performance deterioration due to overheating of the coil 24 can be prevented.

  Here, since the oil is ejected from the squirting nozzle 12c as the rotor body 12a rotates, the oil is evenly distributed over the entire circumference of the stator 10. As a method for cooling the stator, there is a method in which the oil supplied to the upper upper surface of the stator is caused to flow down along the circumferential surface of the stator by gravity, but the oil flow path is the shape and location of the coil and its insulating material. Insufficient cooling of the stator remained due to the influence of unevenness of the insulating paint. However, according to the present embodiment, the entire circumference of the stator 10 can be cooled more reliably, and the peripheral components such as the iron core of the coil 24 can be cooled in addition to the coil 24, and these performances can be maintained.

  When the output of the motor 6 is to be further increased, the energization amount to the motor 6 is also increased, so that the stator 10 and the rotor 12 may be overheated. However, as described above, since the stator 10 and the rotor 12 can be cooled more reliably with a simple configuration, the concern of overheating is eliminated, and the motor 6 can be further increased in output.

The oil that has collided with the coil 24 then moves below the stator 10, accumulates in the oil pan (not shown) of the transmission, and is sucked up by the oil pump 52 inside the oil suction passage (not shown). It is circulated by being pumped again into the annular gap 38.
On the other hand, the oil that has flowed into the annular gap 44 from the cavity 28 is supplied into the torque converter 4 through the oil hole 46 c and becomes hydraulic oil for the torque converter 4. The oil supplied to the torque converter 4 is returned to the transmission 8 through the oil passages 42b and 36b in order, collected in the oil pan, sucked up by the oil pump 52 and circulated in the same manner as described above.

As described above, when an oil passage that connects the rotor main body 12a and the torque converter 4 to the output shaft (rotary shaft 16) of the motor 6 is formed, the oil for the transmission 8 is transferred to the rotary shaft 18 and the rotor. It can be supplied into the torque converter 4 through the inside of the main body 12 a and the rotating shaft 16.
As a result, even if the torque converter 4 is disposed between the internal combustion engine 2 and the motor 6, that is, the torque converter 4 is located away from the transmission 8, the transmission 8 Therefore, the internal combustion engine 2 and the motor 6 can be connected via the torque converter 4.

  Conventionally, there has been an idea of connecting an internal combustion engine and a motor via a torque converter, but the transmission must be disposed away from the torque converter, and the oil for the transmission is hydraulic oil into the torque converter. The above idea has not been put to practical use because it is difficult to supply as For this reason, conventionally, the power transmitted from the internal combustion engine to the motor is cut off between the internal combustion engine and the motor via a one-way clutch, a centrifugal clutch, an electromagnetic clutch, etc. (hereinafter referred to as clutches). Was the limit.

  However, instead of these clutches, if the torque converter 4 that transmits power by the operation of a fluid can be provided as in this embodiment, the amount of the output of the internal combustion engine 2 that is transmitted to the motor 6 can be easily set. Can be adjusted at the same time as compared with the case where the internal combustion engine and the motor are directly connected or when these clutches are interposed between the internal combustion engine and the motor. Impact is alleviated. It also leads to simplification of the transmission and miniaturization of the prime mover.

The present invention is not limited to the above embodiment, and may be configured as follows.
First, in the above description, the oil flowing out from the oil pump 52 flows in the order of the annular gap 38, the oil hole 40, the cavity 28, the annular gap 44, the oil hole 46c, the torque converter 4, and the oil passages 42b and 36b. Although the circulation direction returning to the oil pump 52 has been described, the circulation direction may be reversed. In this case, the oil pump 52 first pumps the oil to the oil passage 36b, and the oil finally flowing out from the annular gap 38 toward the transmission 8 is accumulated in the oil pan, and is sucked up by the oil pump 52 and circulated. .

Further, a radiator may be provided outside the transmission 8, and the circulating oil may be cooled by passing through the radiator.
Further, if the oil pump 52 is set to be driven when the motor 6 is operated, the oil pump 52 does not necessarily have to be driven by being engaged with the main drive shaft 36, and another driving source may be used.

Further, a hole penetrating the peripheral wall of the rotating shaft 16 (18) is opened, and a part of the oil flowing in the rotating shaft 16 (18) is supplied from the hole to the lubricated portion of the bearing 20 (22). Good. Thereby, the bearing 20 (22) can be lubricated with a simple configuration.
Furthermore, the protrusion 12b and the fountain nozzle 12c may be omitted, and the rotor main body 12a may be cooled at least from the inside by the oil without being sprayed toward the coil 24. The omission of the protruding portion 12b and the fountain nozzle 12c is not limited to both the left and right, and may be only one of the left and right. Further, as a simple configuration, the cavity 28, the protruding portion 12b, and the jet nozzle 12c are omitted, so that the rotor body 12a and the coil 24 are not cooled, and the rotor 12 is at least in the torque converter 4 for the transmission 8. An oil passage for supplying the oil may be formed.

Schematic diagram according to an embodiment of the present invention AA line sectional view of FIG.

Explanation of symbols

2 Internal combustion engine 4 Torque converter 6 Motor 8 Transmission 10 Stator 12 Rotor 12a Rotor body 12c Oil nozzle 16 Rotating shaft 18 Rotating shaft 20 Bearing 22 Bearing 28 Cavity 36 Main drive shaft 36b Oil passage 38 Annular gap 40 Oil hole 42 Relay Shaft 42b Oil passage 44 Annular gap 46c Oil hole 52 Oil pump

Claims (10)

An internal combustion engine, a liquid torque converter connected to the output shaft of the internal combustion engine, a motor connected to the output shaft of the torque converter, and a transmission connected to the rotation shaft of the motor. Configured,
A prime mover characterized in that an oil passage is formed through the interior of the rotating shaft of the motor to supply oil for the transmission into the torque converter.   2. The prime mover according to claim 1, wherein the rotation shaft of the motor is directly connected to the input shaft so as to rotate integrally with the input shaft of the transmission.   The prime mover according to claim 1 or 2, wherein the oil guided into the torque converter is returned to the transmission side so that the oil circulates. The output shaft of the torque converter is provided through the rotor main body central portion together with the rotation shaft of the motor,
The oil introduced into the torque converter is returned to the transmission side through a second oil passage formed through an output shaft center portion of the torque converter. The prime mover described. The output shaft of the torque converter is connected to the input shaft of the transmission so as to rotate integrally with the input shaft of the transmission,
The prime mover according to claim 4, wherein a third oil passage is formed in the input shaft of the transmission to communicate with the second oil passage and return oil to the transmission side.   The prime mover according to claim 5, wherein the oil circulation direction passing through the oil passage, the second oil passage, and the third oil passage is reversed.   The prime mover according to any one of claims 1 to 6, wherein a cavity is formed inside the rotor body of the motor and the cavity is communicated with the oil passage.   An oil nozzle that communicates with the cavity and opens toward the stator of the motor and that injects oil in the cavity toward the stator is provided on the rotor body. The prime mover according to 7.   The prime mover according to any one of claims 1 to 8, wherein oil is pumped by an oil pump driven by the motor. A hole that penetrates the peripheral wall of the rotation shaft of the motor is opened, and a part of the oil flowing through the oil passage is supplied from the hole to a lubricated portion of a bearing that supports the motor rotation shaft. The prime mover according to any one of claims 1 to 9.

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