JP6264306B2 - Hybrid drive unit - Google Patents

Description

  The present invention relates to a drive device for a hybrid vehicle including an engine and a motor as drive power sources.

  An example of this type of device is described in Patent Document 1. The device described in Patent Document 1 includes an engine, a first motor / generator (MG1), and a second motor / generator as driving force sources, and the power output from the engine is transmitted to the MG1 side by a power split mechanism. It is configured to be divided and transmitted to the drive shaft side. A one-way clutch is provided between the output shaft of the engine and the input shaft of the power split mechanism. The one-way clutch includes an outer ring fixed to the case and an inner ring connected to the output shaft via a flywheel. Have. The one-way clutch is configured to release the outer ring and the inner ring when the engine rotates in the forward direction, and to engage the outer ring and the inner ring when the engine tries to rotate in the reverse direction.

  In addition, the transaxle case described in Patent Document 2 includes a damper chamber that houses a damper disposed between the engine and the transmission. In addition, there are provided an inlet for supplying air to the damper chamber, a discharge port for discharging air from the damper chamber, and a communication pipe provided in the vicinity of the exhaust port for communicating the exhaust port with the intake pipe of the engine. Yes. When the pressure in the intake pipe decreases as the engine is driven, the pressure in the vicinity of the exhaust port decreases accordingly. By doing so, it is configured to discharge dust together with air from the damper chamber.

  Moreover, the apparatus described in Patent Document 3 includes a clutch chamber that houses a dry clutch in a clutch housing. An intake hole is formed on the outer side in the radial direction of the housing cover that closes the opening of the clutch housing, and an exhaust hole is formed on the inner side in the radial direction. When a pressure difference is generated in the clutch chamber due to the centrifugal force accompanying the rotation of the dry clutch, air is sucked into the clutch chamber from the intake hole due to the pressure difference. The air is discharged together with dust through the gap of the clutch drum from the exhaust hole to the space between the end of the engine block and the housing cover.

  Furthermore, the hybrid vehicle described in Patent Document 4 includes a one-way clutch and a brake between the engine and the transmission. These one-way clutches and brakes are configured to be free when the engine rotates in the forward direction and locked when the engine attempts to rotate in the reverse direction.

International Publication No. 2013/140527 JP 2007-278447 A JP 2014-062556 A JP 2000-355224 A

  In the configuration described in Patent Document 1, the internal space of the case is partitioned into an engine-side space and a transmission-side space by a one-way clutch and a flywheel, and each space is closed by the one-way clutch and the flywheel. For this reason, when a foreign substance enters from a gap between the cases, it may be difficult to discharge the foreign substance from each space. For example, when water intrudes into the case, it is difficult to discharge the water, so that water may stay or the case may corrode due to the staying water. Such an inconvenience may occur similarly when a brake described in Patent Document 4 is provided instead of the one-way clutch. In addition, the devices described in Patent Document 2 and Patent Document 3 are configured to discharge dust that has entered the damper chamber and the clutch chamber together with air, and do not discharge water that has entered the case.

  The present invention has been made paying attention to the above technical problem, and an object of the present invention is to provide a hybrid drive device that can discharge water that has entered a partitioned housing.

  In order to achieve the above object, according to the present invention, a damper mechanism is connected to an output shaft of an engine, and a brake mechanism for selectively stopping rotation of the output shaft is disposed between the engine and the damper mechanism. In the hybrid drive device, the first housing housing the damper mechanism and the engine-side second housing adjacent to the first housing are provided to partition the interior of these housings. A lower end portion of the inner wall surface of the first housing and a lower end portion of the inner wall surface of the second housing are vertically displaced, and a through hole for communicating the first housing and the second housing is provided. It is formed in the separator and is at a higher position among the lower end portion of the inner wall surface of the first housing and the lower end portion of the inner wall surface of the second housing. Is characterized in that the inner wall lower end of the through hole at a position lower than the wall surface lower end is located.

  According to this invention, the through-hole which connects the 1st housing and the 2nd housing is formed in the separator. The lower end portion of the inner wall surface of the through hole is disposed at a position lower than the lower end portion of the inner wall surface at a higher position among the inner wall lower end portion of the first housing and the inner wall lower end portion of the second housing. That is, the lower end portions of the inner wall surfaces are arranged stepwise. Therefore, for example, when water enters one of the first housing and the second housing at a higher position, the separator dams the water into the one housing at the higher position, and the water It can suppress staying. As a result, the drainage performance of the entire apparatus is improved, and deterioration of the environment in each housing can be suppressed.

It is sectional drawing which shows a part of example of the hybrid drive device which concerns on this embodiment. It is sectional drawing which expands and shows the lower connection part among the connection parts of a main housing and an engine block. It is an arrow view of A in FIG. It is sectional drawing which shows a part of other example of the hybrid drive device which concerns on this embodiment. It is an arrow view of B in FIG.

  The hybrid drive device according to this embodiment can be applied to, for example, a hybrid vehicle including an engine, a first motor / generator (MG1), and a second motor / generator (MG2) as driving force sources. The power to be transmitted is divided and transmitted to the MG1 side and the drive shaft side by the power split mechanism. Further, the power generated by MG1 is supplied to MG2, and the power output from MG2 can be added to the drive shaft.

  FIG. 1 is a cross-sectional view showing a part of an example of a hybrid drive apparatus according to this embodiment. A flywheel 2 is fixed to an output shaft 1 of an engine (not shown) by bolts. A torque limiter mechanism 3 is attached to the outer portion of the flywheel 2 by other bolts. The torque limiter mechanism 3 has a configuration similar to that conventionally known, and is configured to generate a slip and interrupt torque transmission when a torque exceeding a preset transmission torque capacity is input. A spring damper 4 corresponding to the damper mechanism in this embodiment is connected to the output side of the torque limiter mechanism 3. The configuration of the spring damper 4 may be the same as that of a conventionally known spring damper. That is, a driving side plate that rotates integrally with the output side member of the torque limiter mechanism 3, a driven side plate that is disposed opposite to the driving side plate and is relatively rotatable with respect to the driving side plate, and formed on these plates And a spring which is disposed inside the window hole portion and which is compressed by relative rotation of each plate. The driven plate of the spring damper 4 described above is connected to an input shaft 5 of a power split mechanism (not shown). As shown in FIG. 1, the input shaft 5 is connected to the engine output shaft 1 via a one-way clutch 6 corresponding to the brake mechanism in this embodiment.

  The one-way clutch 6 includes a fixed member 7 corresponding to the separator in this embodiment and a movable member 8. The fixing member 7 is a plate-like member and is formed in a substantially circular shape. The outer peripheral edge of the fixing member 7 is sandwiched between the main housing 9 and the engine block 10 and is fixed to the main housing 9 and the engine block 10. The main housing 9 accommodates a transmission mechanism such as a flywheel 2, a torque limiter mechanism 3, a spring damper 4, a power split mechanism, and MG 1 and 2 disposed on the output side of the engine. A circular through hole 11 that allows the fixing member 7 to communicate in the thickness direction is formed in the lower portion of the fixing member 7. Further, the fixing member 7 partitions the main housing 9 into a first housing 12 on the transmission mechanism side and a second housing 13 on the engine side. The above-described spring damper 4 is accommodated in the first housing 12. The movable member 8 is integrally attached to the flywheel 2. The one-way clutch 6 is configured to selectively engage the fixed member 7 and the movable member 8. Specifically, the output shaft 1 is released when the output shaft 1 rotates forward, and is engaged when the torque in the direction of rotating the output shaft 1 acts on the output shaft 1 to stop the reverse rotation of the output shaft 1. It is configured. The forward rotation is rotation in the rotation direction of the engine during the combustion operation, and the reverse rotation is rotation in the direction opposite to the rotation direction of the engine during the combustion operation.

  Another through hole 14 that allows the main housing 9 to communicate in the thickness direction is formed in the lower portion of the main housing 9. The other through holes 14 are for discharging water that has entered the main housing 9 to the outside. Specifically, it is formed at the lowermost part of the main housing 9 in the vertical direction. The other through-holes 14 are formed at positions outside the region α where the one-way clutch 6 is disposed in the axial direction of the hybrid drive device, that is, in the left-right direction in FIG. By doing so, even if foreign matter such as water or dust enters the inside of the main housing 9 through the other through-holes 14 from the outside of the main housing 9, such foreign matter can enter the one-way clutch 6. It is possible to avoid adhesion.

  An end surface of the main housing 9 on the engine block 10 side is a mating surface 15, and a part of the mating surface 15 is thinned as shown in FIG. In the following description, the above-described portion that has been thinned is referred to as a thinned portion 16. Further, the end surface of the engine block 10 on the main housing 9 side is another mating surface 17, and a part of the other mating surface 17 is so-called thinned. In the following description, the portion that has been thinned is referred to as another thinned portion 18. The mating surfaces 15 and 17 and the fixing member 7 are in contact with each other so that the lightening portions 16 and 18 and the through hole 11 of the fixing member 7 do not communicate with each other. As shown in FIG. 1, each of the lightening portions 16 and 18 is closed by a fixing member 7.

  FIG. 2 is an enlarged cross-sectional view of the lower connecting portion of the connecting portions between the main housing 9 and the engine block 10, and FIG. 3 is a view taken in the direction of arrow A in FIG. As shown in FIGS. 2 and 3, the lower end portion of the main housing 9 in the vertical direction of the inner wall surface of the main housing 9 is positioned below the lower end portion of the inner wall surface of the engine block 10 in the vertical direction. doing. Moreover, the lower end part in the said up-down direction among the inner wall surfaces of the through-hole 11 is located below the lower end part in the said up-down direction among the inner wall surfaces of the engine block 10 mentioned above. The lower end portion of the main housing 9 in the vertical direction of the main housing 9 corresponds to the lower end portion of the inner wall surface of the first housing in this embodiment. In the following description, the first inner wall surface This is referred to as the lower end 19. Moreover, the lower end part in the said up-down direction among the inner wall surfaces of the engine block 10 is equivalent to the inner wall lower end part of the 2nd housing in this embodiment, In the following description, the 2nd inner wall lower end part 20 and I write. The lower end portion in the vertical direction of the inner wall surface of the through hole 11 corresponds to the lower end portion of the inner wall surface of the through hole in this embodiment, and is referred to as a third inner wall lower end portion 21 in the following description. That is, the second inner wall lower end portion 20, the third inner wall lower end portion 21, and the first inner wall lower end portion 19 are arranged stepwise in order from the top in the vertical direction of the main housing 9. In the example shown here, the outer edge 22 of the fixing member 7 and the outer edge 23 of the main housing 9 are configured to coincide with each other, and the outer edge 24 of the engine block 10 is located above and below the main housing 9 from the outer edges 22 and 23. Located on the top in the direction.

  Next, the operation of the hybrid drive apparatus having the configuration shown in FIG. 1 will be described. When water enters the second housing 13 through a gap (not shown), the water moves along the engine block 10 and the fixing member 7 to the lower portion of the second housing 13, that is, the second inner wall lower end portion 20. . Since the third inner wall lower end 21 of the through hole 11 is positioned below the second inner wall lower end 20, the water flows through the through hole 11 to the first housing 12 side. At the lower part of the first housing 12, that is, at the lowermost part of the main housing 9, another through hole 14 that is a drain hole is formed. Discharged.

  Thus, even if the main housing 9 is partitioned by the fixing member 7 of the one-way clutch 6 in the hybrid drive device configured as described above, the through hole 11 is formed in the lower portion of the fixing member 7, so Through this, water that has entered the second housing 13 moves to the first housing 12. Then, it is discharged to the outside through another through hole 14. In addition, since the third inner wall lower end 21 of the through hole 11 is located between the first inner wall lower end 19 and the second inner wall lower end 20 in the vertical direction of the main housing 9, the second housing It can suppress that the fixing member 7 dams up water in 13. That is, in the example shown in FIG. 1, it is possible to prevent water from staying in the second housing 13. Further, in the above-described configuration, each of the lightening portions 16 and 18 is closed by the fixing member 7, that is, each of the lightening portions 16 and 18 and the through hole 11 are not in communication with each other. 16 and 18 can be suppressed. As a result, it is possible to suppress water from being accumulated in the engine block 10 and the main housing 9 and to suppress deterioration of the environment in the main housing 9 due to the accumulated water. As a result, durability and reliability of the hybrid drive device can be improved.

  FIG. 4 is a cross-sectional view showing a part of another example of the hybrid drive device according to this embodiment, and FIG. 5 is a view taken in the direction of arrow B in FIG. The example shown here is an example in which a through hole is formed by cutting out the lower portion of the fixing member 7. In the following description, this through hole is referred to as a notch 25. The notch 25 is formed by notching the fixing member 7 from a predetermined position in the radial direction of the fixing member 7 to the outer edge 22, and the cutout portions 16, 18 are formed through the notch 25. It is communicated. Further, the inner wall upper end portion 26 of the notch 25 is positioned above the first inner wall lower end portion 19 of the main housing 9 and the second inner wall lower end portion 20 of the engine block 10 described above. For this reason, when water enters the second housing 13 on the engine side, the water is discharged to the outside through the notch 25. Similarly, when water enters the first housing 12 on the transmission mechanism side, the water is discharged to the outside through the notch 25. As described above, in the configuration shown in FIG. 4, the water that has entered the main housing 9 is discharged to the outside through the cutout portion 25, so that the main housing 9 is compared with the hybrid drive device having the configuration shown in FIG. 1. There is no need to provide another through-hole 14, and the number of processing steps and processing costs can be reduced accordingly. Moreover, since it can suppress that water retains in the main housing 9, the deterioration of the environment in the main housing 9 can be suppressed similarly to the structure shown in FIG. 1 mentioned above.

  DESCRIPTION OF SYMBOLS 1 ... Output shaft 4 ... Spring damper (damper mechanism), 6 ... One-way clutch (brake mechanism), 7 ... Fixed member (separator), 8 ... Movable member, 9 ... Main housing, 10 ... Engine block, 11 ... Through-hole 12 ... First housing, 13 ... Second housing, 19 ... Lower end of inner wall surface of first housing, 20 ... Lower end portion of inner wall surface of second housing, 21 ... Lower end portion of inner wall surface of through hole.

Claims (1)

In the hybrid drive device in which a damper mechanism is connected to the output shaft of the engine and a brake mechanism that selectively stops rotation of the output shaft is disposed between the engine and the damper mechanism.
A separator provided between a first housing that houses the damper mechanism and a second housing on the engine side that is adjacent to the first housing, and partitions the inside of these housings;
The inner wall lower end of the first housing and the inner wall lower end of the second housing are displaced in the vertical direction,
A through hole for communicating the first housing and the second housing is formed in the separator,
The inner wall lower end of the through hole is located at a position lower than the lower inner wall lower end of the first housing and the lower inner wall lower end of the second housing. A hybrid drive device.

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