JP5977045B2 - Motor unit for hybrid system - Google Patents

Description

  The present invention relates to a hybrid system motor unit applied to a hybrid system using an engine and a motor as a driving power source, and more particularly to a hybrid system motor unit in which oil is supplied to a bearing that supports an output shaft.

  Conventionally, hybrid vehicles are increasing as vehicles equipped with a hybrid system using an engine and a motor as a driving power source. In a power transmission device for a hybrid vehicle, for example, a motor is disposed between an engine and a transmission, and a rotation shaft connected to a crankshaft of the engine via a clutch serves as an output shaft of the motor. When the motor is driven, the engine output is supplemented when starting, accelerating, or climbing, or the vehicle runs only with the motor output.

  Further, since a large-sized hybrid vehicle requires a large-sized motor as compared with a general passenger car, the amount of heat generated by the motor during driving increases. For this reason, an oil-cooled system, which is a system that has higher cooling efficiency than the air-cooled system and that uses insulating oil as a cooling medium, is adopted for the motor cooling device that cools the motor.

  For example, in the motor unit described in Patent Document 1, a housing having a motor chamber in which a motor is accommodated supports a rotating shaft via a bearing, and cooling oil is stored at the bottom of the housing. An oil pan is formed. The oil stored in the oil pan is pumped to the top side of the housing by an oil pump and dropped from the supply port provided in the motor chamber toward the motor.

JP 2011-91956 A

  By the way, the bearing that supports the rotating shaft has a large rotational torque applied to the rotating shaft and a large load on the bearing, particularly in the above-described large hybrid vehicle. Therefore, lubrication is necessary to maintain the bearing function. is there. In Patent Document 1, the oil supply to the bearing is caused by the oil supplied to the motor chamber being scattered to the surroundings by the rotation of the rotating shaft or the rotor of the motor, or an oil passage capable of supplying oil to the bearing is provided in the housing or the like. It is done by forming.

  However, the method of splashing oil by rotating the rotating shaft, etc., tends to be less reliable especially at low rotations, and the method of supplying oil to the bearing through the oil passage is used to pump the oil to various places. It is necessary to increase the output of the pump by an amount corresponding to the oil passage formed to supply oil. Therefore, the structure which can raise the oil supply efficiency with respect to a bearing is calculated | required. Such requests are not limited to vehicles such as hybrid vehicles, but are common to construction machines and ships equipped with a hybrid system.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hybrid system motor unit capable of increasing the oil supply efficiency of a bearing that supports an output shaft.

One aspect of the present invention includes a rotor fixed to a rotating shaft and a stator disposed around the rotor, a housing through which the rotating shaft is inserted, and an oil that receives rotation of the rotating shaft. And a supply unit that supplies oil discharged from the top of the housing to the inside of the housing, wherein one side wall of the housing protrudes to the inside of the housing. A support portion having a cylindrical shape through which the rotation shaft is inserted and supporting the rotation shaft via a bearing fitted between the rotation shaft and having an outer peripheral surface extending in the axial direction of the rotation shaft ; anda two guide ribs which continuously toward the top from projecting the supporting portion inside the housing, the bearing, the a distal end of the support portion Is fitted between the rotating shaft, wherein the guide rib, thereby have a length that faces the front end of the rotor at a radial direction of the rotary shaft, the height from the outer peripheral surface of the guide rib is the support The supply part has a supply port facing between the two guide ribs.

  According to one aspect of the present invention, among the oil scattered around by rotation of the rotating shaft and rotation of the rotor constituting the motor, the oil scattered to the region sandwiched between the guide ribs on one side wall of the housing is In the process of returning to the oil pan, the guide rib guides the bearing. That is, the oil scattered in the region sandwiched between the guide ribs on one side wall of the housing is guided by the bearing, so that the bearing can be efficiently supplied with oil. Moreover, since the guide rib extends from the support portion to the tip of the rotor in the radial direction of the rotating shaft, the oil scattered by the rotation of the rotor can easily hit the guide rib. Therefore, it becomes easy to secure the oil supplied to the bearing.

  In one aspect of the present invention, the support portion has an outer peripheral surface extending in the axial direction of the rotary shaft, and the bearing is fitted between the tip of the support portion and the rotary shaft, The guide rib has a portion where the height from the outer peripheral surface of the guide rib increases from the distal end of the support portion toward the proximal end of the support portion.

  According to one aspect of the present invention, the support portion has an outer peripheral surface extending in the axial direction of the rotating shaft, and the height of the guide rib formed on the outer peripheral surface is from the base end of the support portion to the support portion. It is lowered toward the tip. As a result, the oil guided by the guide rib tends to overflow from the front end of the support portion, so that the oil is easily supplied to the bearing.

In one aspect of the present invention, the one side wall of the housing has a multi-stage shape in which the support portion protrudes most inside the housing.
When one side wall of the housing has a multi-stage shape that protrudes to the inside of the housing by the support portion, a part of the oil flows along the step so as to bypass the bearing. On the other hand, the guide rib is continuously formed from the support portion to the tip of the rotor in the radial direction of the rotating shaft. That is, the guide rib is formed so as to straddle the step. Therefore, one side wall of the housing has a multi-stage shape, and oil flowing so as to bypass the bearing along the step can be guided to the bearing.

In one aspect of the present invention, at least one guide rib is continuous from the support portion to the outer peripheral portion of one side wall of the housing inside the housing.
According to one aspect of the present invention, since at least one of the guide ribs is continuous to the outer peripheral portion of the one side wall of the housing, both of the two guide ribs are not continuous to the outer peripheral portion of the one side wall of the housing. As compared with the above, the area sandwiched between these guide ribs can be increased. As a result, oil supplied to the bearing can be secured with a higher probability.

In one aspect of the present invention, the two guide ribs are axisymmetric with respect to a line connecting the supply port and the support portion in a plan view from the axial direction of the rotation shaft.
The oil scattering state has a tendency according to the rotation direction of the rotating shaft. However, according to one of the above-described aspects of the invention, the two guide ribs are arranged so as to be symmetrical with respect to the rotation. Even if the rotation directions of the shafts are different from each other, the amount of oil supplied to the bearings can be made substantially equal under the assumption that the rotation speeds of the rotation shafts are equal.

1 is a cross-sectional view showing a cross-sectional structure of an embodiment embodying a motor unit for a hybrid system according to the present invention, and showing a cross-sectional structure in the vicinity of a motor. The top view which shows the planar structure of the motor housing in the planar view from the axial direction of a rotating shaft.

Hereinafter, an embodiment embodying a motor unit for a hybrid system of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, in a hybrid system power transmission device 10 (hereinafter simply referred to as a power transmission device 10), a flywheel 13 to which a crankshaft 12 of an engine 11 is connected is connected to a rotating shaft on the engine 11 side. The ends of 15 are detachably connected by a clutch 17. The rotating shaft 15 is an output shaft of an oil-cooled motor 19 constituting a hybrid system motor unit 18 (hereinafter simply referred to as a motor unit 18), and is provided at the end of the rotating shaft 15 on the opposite side of the engine 11. Is connected to the input shaft 20 of the transmission 21. The power transmission device 10 transmits to the transmission 21 the rotational torque that at least one of the engine 11 and the motor 19 applies to the rotation shaft 15.

  Of the case body 23 that houses the clutch 17, the motor 19, and the transmission 21, the clutch 17 and the motor 19 are housed in the motor housing 24 that forms the housing of the motor unit 18. The motor housing 24 has a substantially cylindrical shape in which a clutch chamber 25 in which the clutch 17 is accommodated and a motor chamber 26 in which the motor 19 is accommodated are arranged in parallel in the axial direction of the rotary shaft 15. 26 is partitioned by a partition wall 29 which is one side wall of the housing in which the rotary shaft 15 is inserted.

  The clutch 17 accommodated in the clutch chamber 25 is, for example, a friction clutch, and the clutch body 31 constituting the clutch 17 has a clutch disk, a pressure plate, etc. in a space formed by the flywheel 13 and the clutch cover 32. Is housed.

  The clutch 17 normally maintains the crankshaft 12 and the rotary shaft 15 in a connected state, and when the clutch is operated to be disconnected by the driver, the release fork 33 moves the slider 34 from the connected position to the disconnected position. Then, the crankshaft 12 and the rotary shaft 15 that are in the connected state are changed to the disconnected state. Further, when the clutch pedal disengagement operation by the driver is released, the release fork 33 moves the slider 34 from the disengagement position to the connection position, and the crankshaft 12 and the rotary shaft 15 that have been in the disengagement state are again brought into the connection state. And shift.

  On the other hand, the motor 19 accommodated in the motor chamber 26 uses the rotating shaft 15 connected to the crankshaft 12 of the engine 11 via the clutch 17 as an output shaft. The rotor 37 constituting the motor 19 is connected to the rotary shaft 15 so as to rotate with the rotation of the rotary shaft 15. Further, a stator 38 constituting the motor 19 is wound with a coil (not shown) and is fixed to the motor housing 24 so as to surround the outer peripheral portion of the rotor 37.

  When the motor 19 functions as an electric motor, the electric power stored in a battery (not shown) is converted into a three-phase alternating current by an inverter, and the three-phase alternating current is supplied to the stator 38 to rotate through the rotor 37. A rotational torque is applied to the shaft 15. When the motor 19 functions as a generator, the three-phase alternating current generated in the stator 38 by the rotation of the rotor 37 accompanying the rotation of the rotating shaft 15 is converted into a direct current by an inverter and supplied to the battery.

  The partition wall 29 has a multistage disk shape having a recess 40 that is recessed from the flywheel 13 toward the transmission 21, and supports the rotary shaft 15 via a bearing 41 on the inner peripheral surface of the recess 40. . The partition wall 29 is formed with a plurality of ribs 43 across the step 42 of the multi-step surface 29A facing the motor chamber 26 and facing the tip of the rotor 37 in the radial direction of the rotary shaft 15 in the axial direction of the rotary shaft 15. Has been. A front retainer 44 that covers the opening of the recess 40 is fixed to the partition wall 29 on the flywheel 13 side. The front retainer 44 includes an annular flange portion 44a connected to the partition wall 29, and a cylindrical portion 44b extending from the center portion of the flange portion 44a toward the flywheel 13 and has a rotating shaft inside the cylindrical portion 44b. 15 is loosely inserted.

  The above-described oil used for cooling the motor 19 is stored in an oil pan 45 which is a bottom portion of the motor housing 24 and is a part of the motor chamber 26. The oil in the oil pan 45 is pumped by an oil pump 46 disposed in the recess 40 and passes through an external pipe 47 in which an oil filter and an oil cooler are disposed in a supply tank 48 formed at the top of the motor housing 24. It is dropped from the supply port 49 toward the motor 19. Then, the oil supplied to the motor chamber 26 cools the rotor 37 and the stator 38 constituting the motor 19 and supplies the bearings 41 and 67 with oil in the course of returning to the oil pan 45 again.

  The oil pump 46 is fixed to the bottom of the recess 40 by a fastening member (not shown). The oil pump 46 is a gear pump having a drive gear that is spline-coupled to the rotary shaft 15 inserted in the oil pump 46 and a driven gear that is driven by the drive gear. The drive gear and the driven gear are accommodated in a pump body 51 having a multistage cylindrical shape.

  When the rotating shaft 15 is rotated by the engine 11 or the motor 19, the oil pump 46 is driven by the drive gear and sucks oil from the oil pan 45 through the suction passage 53, the communication passage 54 of the partition wall 29, and the suction port 55. To do. Then, the sucked oil is pumped to a supply tank 48 formed at the top of the motor housing 24 through a discharge port 56, an oil pipe 57, an internal passage (not shown) formed in the partition wall 29, and an external pipe 47. That is, the oil pipe 57, the internal passage formed in the partition wall 29, the external pipe 47, the supply tank 48, and the supply port 49 constitute a supply unit that supplies oil to the motor chamber 26.

  A rear retainer 62 is connected to the end of the motor housing 24 on the transmission 21 side between the transmission housing 61 that houses the transmission 21 and the motor housing 24 via a gasket. The rear retainer 62 constituting the housing of the motor unit 18 is provided so as to face the partition wall 29 of the motor housing 24, and partitions the transmission chamber 63 in which the transmission 21 is disposed and the motor chamber 26. The rear retainer 62 has a multi-stage disk shape having a recess 66 that is recessed from the transmission 21 toward the flywheel 13, and supports the rotary shaft 15 via a bearing 67 on the inner peripheral surface of the recess 66. The rear retainer 62 is formed with a plurality of ribs 69 formed so as to be continuous with the step 68 of the multi-step surface 62A facing the motor chamber 26 and extending to a position facing the stator 38 in the axial direction of the rotating shaft 15. An oil seal retainer 70 as a cover member that covers the opening of the recess 66 is detachably fixed to the rear retainer 62 via a gasket. The oil seal retainer 70 has an annular shape surrounding the end of the rotary shaft 15, and the outer peripheral surface of the rotary shaft 15 is freely rotatable via an annular oil seal 71 disposed on the inner peripheral surface of the oil seal retainer 70. It is pivotally supported.

  Next, the rib 43 formed on the partition wall 29 will be described in more detail with reference to FIG. FIG. 2 is a plan view showing a planar structure of the motor housing, and is a diagram showing the planar structure when the multi-step surface 29A is viewed in plan from the axial direction of the rotating shaft 15. FIG.

  As shown in FIG. 2, the partition wall 29 has an insertion hole 72 through which the rotary shaft 15 is inserted, and a cylindrical support portion 73 that supports the bearing 41 at the tip is formed. The ribs 43 formed on the partition wall 29 extend radially from the support portion 73 to the outer peripheral portion of the partition wall 29 along the radial direction of the rotary shaft 15 so as to straddle the step 42 of the partition wall 29. The rib 43 is formed such that the height of the outer peripheral surface of the support portion 73, that is, the height in the radial direction of the rotating shaft 15 gradually decreases from the base end to the tip end of the support portion 73 (see FIG. 1). ). The guide ribs 43a and 43b of the rib 43 are arranged so as to be symmetric with respect to each other about a straight line 74 connecting the supply port 49 and the central portion of the insertion hole 72, and the center between these guide ribs 43a and 43b. A supply port 49 is arranged toward the portion. Further, the side ribs 43c and 43d of the rib 43 are also arranged so as to be bilaterally symmetrical to each other, and are formed to extend from the support portion 73 toward the side. The lower ribs 43e and 43f of the rib 43 are also arranged so as to be symmetrical with each other, and an oil pan 45 is arranged between the lower ribs 43e and 43f.

  Next, the operation of the above-described rib 43, particularly the guide ribs 43a and 43b, will be described with reference to FIG. As shown in FIG. 2, a part of the oil supplied from the supply port 49 and a part of the oil scattered by the rotation of the rotor 37 of the rotary shaft 15 or the motor 19 are between the guide ribs 43a and 43b. When attached to 75, the oil begins to flow toward the bottom of the motor chamber 26.

  Here, in the partition wall 29 in which the guide ribs 43a and 43b are not formed, part of the oil attached to the region 75 flows so as to bypass the bearing 41 by the step 42 of the partition wall 29. The oil pan 45 is returned without being supplied to the bearing 41.

  On the other hand, since the above-described guide ribs 43a and 43b are formed so as to straddle the step 42 of the partition wall 29, most of the oil scattered in the region 75 including oil flowing so as to bypass the bearing 41 by the step 42. Is collected at the tip of the support portion 73. Then, the oil overflows from the portion sandwiched between the guide ribs 43 a and 43 b at the tip of the support portion 73, is supplied to the bearing 41, lubricates the bearing 41, and then returns to the oil pan 45.

  Further, the partition wall 29 receives a mechanical load based on the vibration of the engine 11 and the like from the rotating shaft 15 via the bearing 41. In particular, in a large hybrid vehicle, since the output of the engine 11 is larger than that of a general passenger car, the mechanical load received from the rotary shaft 15 via the bearing 41 is increased. Due to such a mechanical load, concentrated stress is generated at each corner of the multistage surface 29A on the partition wall 29, but each of the ribs 43 is formed so as to straddle the step 42 of the multistage surface 29A. Therefore, the stress generated in the partition wall 29 can be effectively dispersed.

  The rib 69 formed on the rear retainer 62 extends from the step 68 toward the outer peripheral portion while the rib 43 extends from the support portion 73 toward the outer peripheral portion so as to straddle the step 42. The only difference is that the ribs 43 are formed in the same manner as the ribs 43. Therefore, the rib 69 exhibits the same action as the rib 43 described above.

As described above, according to the hybrid system motor unit 18 of the present embodiment, the following effects can be obtained.
(1) Oil scattered to the region 75 sandwiched between the guide ribs 43a and 43b due to the rotation of the rotating shaft 15 and the rotation of the rotor 37 constituting the motor 19 is returned to the oil pan 45 by the guide ribs 43a and 43b. Will be guided to 41. That is, the oil splashed in the region 75 sandwiched between the guide ribs 43a and 43b in the partition wall 29 is guided by the bearing 41, so that the bearing 41 can be reliably supplied with oil and the oil supplied to the bearing 41 can be supplied. Can be performed efficiently.

  (2) Moreover, since the oil supplied to the bearing 41 is the oil supplied from the supply port 49 to the motor chamber 26, the load on the oil pump 46 may increase in order to supply the bearing 41 with oil. Absent.

  (3) Since each of the ribs 43 including the guide ribs 43a and 43b is formed so as to straddle the step 42 formed on the partition wall 29, the mechanical load received from the rotary shaft 15 via the bearing 41 The stress generated in the partition wall 29 can be effectively dispersed. As a result, the mechanical strength of the partition wall 29 and consequently the motor housing 24 can be increased efficiently.

  (4) The height of the guide ribs 43a and 43b from the outer peripheral surface of the support portion 73 is reduced from the base end to the tip end of the support portion 73. Therefore, the oil easily overflows from the portion sandwiched between the guide ribs 43 a and 43 b at the tip of the support portion 73, so that the oil scattered in the region 75 is easily supplied to the bearing 41.

  (5) Since the guide ribs 43a and 43b are formed so as to extend to the outer peripheral portion of the partition wall 29, the guide ribs 43a and 43b are sandwiched between the guide ribs 43a and 43b as compared with the configuration in which the guide ribs 43a and 43b are not extended to the outer peripheral portion of the partition wall 29. The area 75 to be processed can be enlarged. As a result, the oil supplied to the bearing 41 can be secured with a higher probability. In addition, the mechanical strength of the partition wall 29 and thus the motor housing 24 can be increased.

  (6) Since the guide ribs 43a and 43b are arranged so as to be bilaterally symmetric with respect to the straight line 74, under the assumption that the rotation speed of the rotary shaft 15 is equal, regardless of the rotation direction of the rotary shaft 15. The amount of oil supplied to the bearing 41 can be made substantially equal.

In addition, the said embodiment can also be suitably changed and implemented as follows.
The arrangement of the guide ribs 43a and 43b is not limited to the arrangement that is bilaterally symmetric in plan view from the axial direction of the rotating shaft 15. For example, one of the pair of guide ribs 43a and 43b may be formed so as to extend more laterally than the other guide rib in accordance with the rotation direction of the rotary shaft 15. According to such a configuration, it is possible to arrange the guide ribs 43a and 43b according to the scattering state of the oil scattered by the rotating shaft 15 and the rotor 37 of the motor 19.

  The guide ribs 43 a and 43 b are formed to extend from the support portion 73 that supports the bearing 41 to the outer peripheral portion of the partition wall 29. The guide ribs 43 a and 43 b are not limited to this, and only one of the guide ribs 43 a and 43 b may be extended to the outer peripheral portion of the partition wall 29, or both may not be extended to the outer peripheral portion of the partition wall 29. Even in such a configuration, the oil scattered in the region sandwiched between the guide ribs 43 a and 43 b can be guided toward the tip of the support portion 73.

  -In the partition wall 29, the surface which comprises the motor chamber 26 may be a flat surface instead of the multistage surface 29A. Even in such a case, by disposing the above-described guide ribs 43a and 43b, it is possible to guide the oil scattered in the region sandwiched between the guide ribs 43a and 43b to the bearing 41.

  The guide ribs 43a and 43b may have a portion having the same height on the outer peripheral surface of the support portion 73, or may have a portion that is lowered from the distal end to the base end of the support portion 73.

  The supply port for supplying oil to the motor chamber 26 may be disposed on the top side of the motor chamber 26, and is not limited to the supply port 49 formed in the motor housing 24. The hole provided in the provided piping may be sufficient.

  The guide rib only has to protrude from the support portion 73 to a position that protrudes toward the motor chamber 26 and faces the tip of the rotor 37 in the radial direction of the rotating shaft 15, and to a position that faces the tip of the rotor 37. It may extend in a straight line or may extend in a curved line.

  The oil pump is not limited to a gear pump as long as it has a drive gear fixed to the partition wall 29 of the motor housing 24 and connected to the rotary shaft 15, for example, a trochoid pump Also good.

  -The motor unit of the said embodiment is applicable not only to a hybrid vehicle but to a construction machine and a ship provided with the hybrid system which uses an engine and a motor as a drive power source.

  DESCRIPTION OF SYMBOLS 10 ... Power transmission device for hybrid systems, 11 ... Engine, 12 ... Crankshaft, 13 ... Flywheel, 15 ... Rotary shaft, 17 ... Clutch, 18 ... Motor unit for hybrid systems, 19 ... Motor, 20 ... Input shaft, 21 ... Transmission, 23 ... Case body, 24 ... Motor housing, 25 ... Clutch chamber, 26 ... Motor chamber, 29 ... Partition wall, 29A ... Multi-stage surface, 31 ... Clutch body, 32 ... Clutch cover, 33 ... Release fork, 34 ... Slider, 37 ... rotor, 38 ... stator, 40 ... recess, 41 ... bearing, 42 ... step, 43 ... rib, 43a, 43b ... guide rib, 43c, 43d ... side rib, 43e, 43f ... lower rib, 44 ... front Retainer, 44a ... collar, 44b ... cylinder, 45 ... oil pan, 46 ... oil pump, 7 ... External piping, 48 ... Supply tank, 49 ... Supply port, 51 ... Pump body, 53 ... Suction passage, 54 ... Communication passage, 55 ... Suction port, 56 ... Discharge port, 57 ... Oil pipe, 61 ... Transmission housing, 62 ... Rear retainer, 62A ... Multi-stage surface, 63 ... Transmission chamber, 66 ... Recess, 67 ... Bearing, 68 ... Step, 69 ... Rib, 70 ... Oil seal retainer, 71 ... Oil seal, 72 ... Insertion hole, 73 ... Supporting part 74 ... straight line, 75 ... area.

Claims (4)

A housing that accommodates a rotor fixed to the rotating shaft and a stator disposed around the rotor; and the housing through which the rotating shaft is inserted;
A motor unit for a hybrid system comprising: a supply unit that supplies oil discharged from an oil pump that discharges oil in response to rotation of the rotating shaft from the top of the housing;
A side wall of the housing,
A cylindrical shape that protrudes to the inside of the housing and through which the rotation shaft is inserted, supports the rotation shaft via a bearing fitted between the rotation shaft and extends in the axial direction of the rotation shaft. A support having a surface ;
Two guide ribs projecting inside the housing and continuing from the support portion toward the top portion,
The bearing is fitted between a tip of the support and the rotating shaft;
Said guide ribs, as well as have a length that faces the front end of the rotor at a radial direction of the rotary shaft, the height from the outer peripheral surface of the guide ribs from the tip of the support portion to the proximal end of the support portion Has a part that rises toward
The hybrid system motor unit, wherein the supply unit has a supply port facing between the two guide ribs. The one side wall of the housing,
The motor unit for a hybrid system according to claim 1, wherein the support portion has a multistage shape that protrudes most inside the housing. At least one of the guide ribs,
The motor unit for a hybrid system according to claim 1 , wherein the motor unit is continuous from the support portion to an outer peripheral portion of one side wall of the housing inside the housing. The two guide ribs are
The motor unit for a hybrid system according to any one of claims 1 to 3 , wherein the motor unit for a hybrid system is symmetrical with respect to a line connecting the supply port and the support portion in a plan view from the axial direction of the rotation shaft.

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