JP2018178832A - Gear lubrication mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear lubrication device which is reducible in size of an internal combustion engine (engine).SOLUTION: A gear lubrication mechanism comprises: a gear chamber 6 which adjoins a wall part (rear sidewall) 45 of a crankshaft in a cylinder block 4, and in which a gear group is arranged; a cover member (gear cover) 7 for covering the gear chamber; and a lubricant passage 10 for supplying a lubricant to the gear chamber from a main gallery arranged in the cylinder block. The lubricant passage includes: a first passage 11 branched from the main gallery; a second passage 12 communicating with the first passage, and passing through the gear chamber while passing through the inside of a gear shaft 54 of an idle gear 53; a third passage 13 communicating with the second passage and passing through the inside of the cover member; and a fourth passage 14 communicating with the third passage and having an opening part 14a which is opened toward the gear chamber, and supplies the lubricant to the gear group.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a gear lubrication mechanism for lubricating a gear that connects a crankshaft of an internal combustion engine (engine) of a vehicle and a motor shaft of a motor generator.

  There is known a vehicle provided with a generator with a motor function (hereinafter referred to as a motor generator) having both functions of an alternator (generator) and a starter motor (starter) of an engine. By mounting the motor generator, it is possible to enhance the power generation efficiency and to efficiently generate power using the energy at the time of deceleration of the vehicle. When the vehicle accelerates, the motor generator assists the engine. Furthermore, by increasing the output of the motor generator, it is possible to perform creep travel only by the output from the motor generator, for example, before stopping the vehicle or when starting from an idling stop.

  The engine and the motor generator are connected by a transmission mechanism to mutually transmit an output (power). For example, when the crankshaft of the engine and the motor shaft of the motor generator are transmitted by the belt mechanism, the higher the output of the motor generator, the higher the possibility of slippage in the belt. When, for example, the crankshaft and the motor shaft are transmitted by the gear mechanism instead of the belt mechanism, such slippage can be suppressed and the output (power) can be transmitted more reliably.

Unexamined-Japanese-Patent No. 2004-225544

  By the way, various accessories are disposed around the engine. For example, a plurality of belts for driving accessories such as a cooling water pump, a power steering pump, and an air conditioner compressor are installed between the crankshaft and the belt. Therefore, when providing a gear for connecting the crankshaft and the motor shaft in addition to these belts, it is necessary to secure an extra space for arranging the gear. Also, it is necessary to take into consideration the arrangement space of the gear lubrication mechanism for lubricating the gear, for example, the arrangement space of the supply passage of the lubricating oil.

  The demand for compactness for powertrains, including engines, is increasing year by year. For this reason, it is required to arrange a gear lubrication mechanism while achieving downsizing of the engine.

  The present invention has been made based on this, and an object thereof is to provide a gear lubrication mechanism capable of achieving downsizing of an internal combustion engine.

  The gear lubrication mechanism of the present invention is attached to a crankshaft of an internal combustion engine mounted on a vehicle, and attached to a crank gear rotatable with the crankshaft and a motor shaft of a motor generator capable of starting the internal combustion engine It lubricates a gear group having a rotatable motor gear and an idle gear that transmits power between the crank gear and the motor gear. Such a gear lubrication mechanism is adjacent to an axial wall of a crankshaft in a cylinder block and includes a gear chamber in which a gear group is disposed, a cover member for covering the gear chamber, and a main gallery provided on the cylinder block. And a lubricating oil passage for supplying lubricating oil to the The lubricating oil passage is in communication with the first passage branched from the main gallery, the first passage, the second passage passing through the gear chamber through the inside of the idle gear gear shaft, and the second passage. A third passage passing through the interior of the cover member, and a fourth passage communicating with the third passage, opening to the gear chamber and having an opening for supplying lubricating oil to the gear group; Including.

  In this case, the opening is opposed to the vicinity of the meshing portion between the idle gear and the adjacent gear.

  For example, a plurality of idle gears are provided. The second passage is provided on the gear shaft of the idle gear adjacent to the crank gear. The opening portion is opened at a position facing the vicinity of the meshing portion between the idle gear and the motor gear most distant from the crank gear.

  Also, the diameter of the opening is smaller than the inner diameter of the first passage, the second passage, and the third passage.

  The cover member extends along a line connecting the shaft center of the gear shaft and the shaft center of the motor shaft, and has a build-up portion projecting to the transmission side. The buildup portion includes a third passage inside.

  The gear group is provided on the wall of the cylinder block connected to the transmission. A drive plate is attached to the crankshaft. The gear shaft is located between the cylinder block and the drive plate. The build-up portion becomes thicker as it goes from the shaft center of the gear shaft to the shaft center of the motor shaft.

  The gear shaft has a radial opening that opens at the outer periphery to supply lubricating oil from the second passage towards the surface of the idle gear.

  The radiation hole may be opened toward the meshing portion between the idle gear and the adjacent gear.

  According to the gear lubrication mechanism of the present invention, the engine can be miniaturized.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram which shows schematic structure of the power train provided with the gear lubrication mechanism which concerns on one Embodiment of this invention. The figure which shows the internal combustion engine (engine) which concerns on one Embodiment of this invention from the back. It is a figure which shows the cross section of the lubricating oil path of the gear lubrication mechanism in the arrow A 21 part of FIG. 2 in the arrow direction. It is a figure which shows the cross section of the lubricating oil path of the gear lubrication mechanism in arrow A 22 part of FIG. 2 in the arrow direction. Sectional drawing similar to FIG. 4 which shows the structure of the radiation hole of the gear lubrication mechanism which concerns on one Embodiment of this invention. Sectional drawing similar to FIG. 4 which expands and shows another structure of the 4th channel | path of the gear lubrication mechanism which concerns on one Embodiment of this invention. Sectional drawing similar to FIG. 4 which expands and shows another structure of the 4th channel | path of the gear lubrication mechanism which concerns on one Embodiment of this invention. Sectional drawing similar to FIG. 4 which expands and shows another structure of the 4th channel | path of the gear lubrication mechanism which concerns on one Embodiment of this invention. Sectional drawing similar to FIG. 4 which shows the structure of the 5th channel | path of the gear lubrication mechanism which concerns on one Embodiment of this invention.

  Hereinafter, a gear lubrication mechanism according to an embodiment of the present invention will be described with reference to FIGS. 1 to 9. The gear lubrication mechanism according to the present embodiment is a mechanism for lubricating a plurality of gears (gear groups) connecting a crankshaft of an internal combustion engine mounted on a vehicle and a motor shaft of a motor generator.

  FIG. 1 shows a schematic configuration of a power train 2 according to the present embodiment. In the following description, the direction indicated by the arrow D1 in FIG. 1 is the front (front), the opposite direction is the rear (the rear), the direction indicated by the arrow D2 is left (left), and the opposite direction is Defined as right).

  The power train 2 includes an internal combustion engine (hereinafter referred to as an engine) 21, a torque converter 22, a transmission 23, and the like. The engine 21 is connected to the transmission 23 via a torque converter 22. The torque converter 22 is fixed to a drive plate 24 attached to the crankshaft 21S. The crankshaft 21S of the engine 21 is connected to the input side of the torque converter 22, and the input shaft 23S of the transmission 23 is connected to the output side. The output from the transmission 23 is transmitted to drive wheels (not shown).

  FIG. 2 is a view showing the engine 21 from the rear. The engine 21 is configured to include a cylinder block 4 and a cylinder head, an oil pan, an oil pump, etc., all of which are not shown. The cylinder block 4 is formed with a plurality of cylinders (not shown). A piston (not shown) is accommodated in each cylinder so as to be movable back and forth. The piston is connected to the crankshaft 21S via a connecting rod (not shown). The crankshaft 21 S is rotatably held by the crankcase of the cylinder block 4.

  In the engine 21, the crankshaft 21S, the connecting rod, and the like are lubricated by the lubricating oil (engine oil) stored in the oil pan. The lubricating oil is drawn up from an oil pan by an oil pump and is pumped to a main gallery 41 (see FIG. 3) provided in the cylinder block 4. The pumped lubricating oil is supplied to each lubrication site via a branch path (sub gallery) branched from the main gallery 41. The main gallery 41 is formed in the cylinder block 4 along the crankshaft 21S. The lubricating oil that has lubricated each lubrication site is collected in an oil pan after being cooled by an oil cooler (not shown) or the like, and used again for lubrication.

  As shown in FIGS. 1 and 2, the vehicle is provided with a motor generator 3. The motor generator 3 is a generator with a motor function having the functions of an alternator (generator) and a starter motor (starter) of the engine 21. Therefore, motor generator 3 is driven by engine 21 to generate electric power, and charges the electricity generation to the storage device (not shown). Further, motor generator 3 is supplied with power from the power storage device to start engine 21. As the power storage device, for example, a battery pack of a vehicle (such as a plug-in hybrid electric vehicle (PHEV) or the like) equipped with an engine 21 and an electric motor as a motive power supply source of drive wheels, or a 12V battery of a vehicle equipped with only the engine 21 Is the case.

  In the present embodiment, for example, high power output of the motor generator 3 is achieved such that creep traveling with only the motor generator 3 can be performed before the vehicle stops or when starting from idling stop. During such creep travel, the motor generator 3 rotates the crankshaft 21S with its output (power). At this time, the motor generator 3 functions as a drive motor of the engine 21 (drive wheel). The motor generator 3 is disposed at the left rear of the engine 21. In the present embodiment, as an example, the left part of the engine 21 corresponds to the intake side, and the rear part of the engine 21 corresponds to the torque converter 22 and the transmission 23 side.

  As shown in FIGS. 1 to 4, the crankshaft 21 S of the engine 21 and the motor shaft 3 S of the motor generator 3 are connected by the gear mechanism 5 to mutually transmit the output (power). For example, when the motor generator 3 functions as an alternator, the output of the crankshaft 21S is transmitted to the motor shaft 3S. On the other hand, when the motor generator 3 functions as a start motor or a drive motor, the output of the motor shaft 3S is transmitted to the crankshaft 21S.

  The gear mechanism 5 includes a plurality of gears (gear groups). The gear group is provided on a wall (hereinafter referred to as a rear side wall) 45 of the cylinder block 4 connected to the transmission 23. In the present embodiment, as an example, the gear mechanism 5 includes a crank gear 51, a motor gear 52, and an idle gear 53. The crank gear 51 is attached to the crankshaft 21S and is rotatable together with the crankshaft 21S. That is, the crank gear 51 rotates in the same manner (rotational speed, rotational speed, rotational direction, etc.) as the crankshaft 21S. The motor gear 52 is attached to the motor shaft 3S of the motor generator 3 and is rotatable with the motor shaft 3S. That is, the motor gear 52 rotates in the same manner (rotational speed, number of rotations, rotational direction, etc.) as the motor shaft 3S. The idle gear 53 is attached to a non-rotating shaft (hereinafter referred to as a gear shaft) 54 and is rotatable around the gear shaft 54. The idle gear 53 rotates between the crank gear 51 and the motor gear 52 to transmit power. The gear shaft 54 is located between the cylinder block 4 and the drive plate 24 and is fixed to the mounting hole 42 (see FIG. 4) of the cylinder block 4. A bearing (not shown) is interposed between the inner peripheral portion of the idle gear 53 and the outer peripheral portion of the gear shaft 54.

  The number of idle gears 53 and gear shafts 54 is not particularly limited. In the present embodiment, as an example, the gear mechanism 5 includes two idle gears 55, 57 and two gear shafts 56, 58. The first idle gear 55 is attached to the first gear shaft 56 and meshes with the crank gear 51. The second idle gear 57 is attached to the second gear shaft 58 and meshes with the motor gear 52. The first idle gear 55 and the second idle gear 57 mesh with each other. As a result, the crank gear 51, the first idle gear 55, the second idle gear 57, and the motor gear 52 are engaged in this order, and the output (power) of one of the crankshaft 21S and the motor shaft 3S is transmitted to the other.

  The number of teeth of the crank gear 51, the motor gear 52, the first idle gear 55 and the second idle gear 57 may be set arbitrarily in consideration of the following points. The number of teeth of the crank gear 51 is set on the basis of the upper limit of the tip diameter which does not interfere with the fixed bosses 81 of the gear cover 7 described later. Specifically, it is made not to interfere with the fixed boss 81 provided near the crankshaft 21S of the maintenance hole 43 of the cylinder block 4 (see FIG. 2). The number of teeth of the motor gear 52 is set based on the number of teeth of the crank gear 51 according to the speed increase ratio. The motor gear 52 is accelerated more than the crank gear 51 via the first idle gear 55 and the second idle gear 57. The number of teeth of the first idle gear 55 and the second idle gear 57 is the same. Specifically, the first idle gear 55 and the second idle gear 57 can be disposed between the maintenance hole 43 of the cylinder block 4 and the main gallery plug 44 (see FIG. 2), and the maintenance hole 43 can be maximized. It is set based on the tip diameter.

  The crank gear 51, the motor gear 52, the idle gear 53, and the gear shaft 54 are disposed in the gear chamber 6. The gear chamber 6 is a housing space of the gear mechanism 5 adjacent to an axial wall portion of the crankshaft 21S in the cylinder block 4 (in the present embodiment, as an example, a rear wall portion (rear sidewall 45)). In the present embodiment, the gear chamber 6 is formed by the rear side wall 45, the cover member (hereinafter referred to as a gear cover) 7, and the peripheral wall 8. The main gallery plug 44 is disposed in the gear chamber 6. On the other hand, the maintenance hole 43 is disposed out of the gear chamber 6 (open to the outside of the gear chamber 6).

  The gear cover 7 is a substantially plate-like member that covers the arrangement area of the gear mechanism 5 of the gear chamber 6, that is, the gears 51 to 53 and the gear shaft 54, and is attached to the rear side wall 45 of the cylinder block 4. In the present embodiment, as an example, the gear cover 7 is bolted to a plurality of (for example, twelve) fixing bosses 81 provided on the peripheral wall 8 of the gear chamber 6. In such a bolted state, the gear cover 7 supports the first gear shaft 56 at the first support hole 71 and supports the second gear shaft 58 at the second support hole 72 (see FIG. See Figure 4). The gear cover 7 is formed with an opening 73 for exposing the rear end 21a of the crankshaft 21S. The space between the rear end 21a of the crankshaft 21S and the opening 73 is sealed by an oil seal (not shown).

  The peripheral wall 8 is formed by abutting a peripheral wall 82 on the cylinder block 4 side and a peripheral wall 83 on the gear cover 7 side (see FIG. 4). The peripheral wall 82 on the cylinder block 4 side stands from the rear side wall 45 of the cylinder block 4 so as to surround the outer edge of the gear chamber 6, that is, a region larger than the arrangement region of the four gears 51-53. The peripheral wall 83 on the gear cover 7 side is erected from the gear cover 7 in such a manner that the contour thereof matches the peripheral wall 82 on the cylinder block 4 side. The height of the peripheral wall 8 (the sum of the height of the peripheral wall 82 on the cylinder block 4 side and the peripheral wall 83 on the gear cover 7 side) is within a range where the gears 51 to 53 arranged in the gear chamber 6 do not interfere with the gear cover 7 Keep it as low as possible.

  Next, the gear lubrication mechanism 1 will be described with reference to FIGS. 3 and 4. 3 shows a cross section of the lubricating oil passage 10 of the gear lubrication mechanism 1 in the arrow A21 portion of FIG. 2 and FIG. 4 in the arrow A22 portion of FIG. In the present embodiment, the gear lubrication mechanism 1 lubricates the crank gear 51, the motor gear 52, and the idle gear 53, respectively. Specifically, the meshing portion between the gears 51, 52, 53 is lubricated by the gear lubrication mechanism 1.

  The gear lubrication mechanism 1 includes a lubricating oil passage 10 for supplying lubricating oil from the main gallery 41 of the cylinder block 4 to the gear chamber 6. The lubricating oil passage 10 branches from the main gallery 41 of the cylinder block 4, passes through the gear chamber 6, passes through the inside of the gear cover 7, and reaches the gear chamber 6. That is, the lubricating oil passage 10 has the front side (the engine 21 side) of the gear chamber 6 as the upstream, crosses the gear chamber 6 and comes out to the rear side (the transmission 23 (torque converter 22) side). The lubricating oil passage 10 opens from the rear side of the gear chamber 6 toward the inside of the gear chamber 6 (the arrangement region of the gears 51 to 53).

  As an example in the present embodiment, the lubricating oil passage 10 is configured to include four passages 11-14. The first passage 11 is a most upstream passage branched from the main gallery 41. The first passage 11 branches radially from the main gallery 41 before the main gallery plug 44. The main gallery plug 44 is a lid member that seals the main gallery 41 at the rear end of the main gallery 41.

  The second passage 12 communicates with the first passage 11, passes through the gear chamber 6 and communicates with the third passage 13. The second passage 12 passes through the gear chamber 6 through the inside of the gear shaft 54 of the idle gear 53. In the present embodiment, as an example, the second passage 12 is provided between the first passage 11 and the third passage 13 and the cylinder block 4 and the gear shaft 54 (specifically, the first gear shaft 56). Through the shaft center of the gear shaft 54. In other words, the cylinder block 4 has a hole 46 which is continuous from the tip end 11 a of the first passage 11 to the center of the mounting hole 42 of the first gear shaft 56. The first gear shaft 56 has a hole 56a penetrating the shaft center. The holes 46 and 56 a communicate with each other with the first gear shaft 56 fixed to the mounting hole 42, and become the second passage 12. The first gear shaft 56 corresponds to the gear shaft 54 of the idle gear 53 adjacent to the crank gear 51.

  The third passage 13 communicates with the second passage 12 and communicates with the fourth passage 14 through the inside of the gear cover 7. In the present embodiment, as an example, the gear cover 7 is provided with a buildup portion 74 that protrudes rearward (projects to the transmission 23 side). The build-up portion 74 extends along a line (one-dot chain line A22 shown in FIG. 2) connecting the first gear shaft 56, the second gear shaft 58, and the axis centers O1, O2 and O3 of the motor shaft 3S. There is. Further, the buildup portion 74 becomes thicker as it goes from the first gear shaft 56 to the motor shaft 3S. By doing this, the first gear shaft 56 can be disposed at a position overlapping the drive plate 24 in a rear view of the power train 2. For this reason, even if the length in the left-right direction of the powertrain 2 is reduced, the length in the front-rear direction of the powertrain 2 can be reduced. The third passage 13 is formed inside the buildup portion 74 along the extension direction of the buildup portion 74. The proximal end 13 a of the third passage 13 communicates with the first support hole 71 of the first gear shaft 56. Thereby, the third passage 13 communicates with the hole 56 a of the axial center portion of the first gear shaft 56, that is, the second passage 12 in the first support hole 71. The tip 13b of the third passage 13 penetrates the buildup portion 74, but is closed by the sealing member 13c.

  The fourth passage 14 is in communication with the third passage 13 and is the most downstream passage leading to the gear chamber 6. The fourth passage 14 has an opening 14 a that opens toward the gear chamber 6 and supplies lubricating oil to the gear group (gears 51 to 53). In the present embodiment, the fourth passage 14 branches off in front of the leading end 13 b of the third passage 13 and opens in the gear cover 7. The opening portion 14 a is opened facing the vicinity of the meshing portion between the idle gear 53 and the adjacent gear. As an example, the opening 14a is open at a position facing the vicinity of the meshing portion G1 with the second idle gear 57, which is the idle gear 53 most distant from the crank gear 51, and the motor gear 52. The meshing portion G1 corresponds to the furthest meshing portion in the gear mechanism 5 with reference to the most upstream first passage 11.

  By providing the lubricating oil passage 10 in this manner, the lubricating oil is sequentially passed from the main gallery 41 through the first passage 11, the second passage 12, the third passage 13, and the fourth passage 14 in this order. It is supplied to the meshing portion G1 between the second idle gear 57 and the motor gear 52 through the opening 14a.

  The diameter (bore diameter) of the opening 14 a of the fourth passage 14 is smaller than the inner diameter (bore diameter) of the first passage 11, the second passage 12, and the third passage 13. In the present embodiment, as an example, the inner diameter (pore diameter) of the first passage 11, the second passage 12, the third passage 13, and the fourth passage 14 is smaller than the inner diameter (pore diameter) of the main gallery 41. It is almost aligned to the size of the That is, these passages 11 to 14 have smaller pores than the main gallery 41. As a result, the pressure of the lubricating oil in the passages 11 to 14 is higher than that of the main gallery 41, and the lubricating oil can be reliably injected from the opening 14a of the lubricating oil passage 10 to the target location. Therefore, the lubricating oil can be reliably supplied to the meshing portion G1 between the second idle gear 57 and the motor gear 52. Then, the injected lubricating oil sequentially spreads from the second idle gear 57 to the first idle gear 55 and further to the crank gear 51 by the meshing of the gears 57, 55 and 51. As a result, these gears 51, 52, 55 and 57 can be lubricated smoothly. The lubricating oil lubricating the gears 51, 52, 55, 57 is collected in an oil pan and used again for lubrication. An oil outlet (not shown) for guiding the lubricating oil to the oil pan is disposed in the gear chamber 6.

  In the present embodiment, the gear chamber 6 of the gear lubrication mechanism 1 is formed by the rear side wall 45 of the cylinder block 4, the gear cover 7, and the peripheral wall 8. That is, the gear chamber 6 is disposed in the rear of the cylinder block 4 (in the connection direction with the transmission 23) adjacent to the rear side wall 45. The lubricating oil passage 10 branches from the main gallery 41 of the cylinder block 4, passes through the gear chamber 6, passes through the inside of the gear cover 7, and reaches the gear chamber 6. That is, the lubricating oil passage 10 has the front side (the engine 21 side) of the gear chamber 6 as the upstream, crosses the gear chamber 6 and is pulled out to the rear side (the transmission 23 (torque converter 22) side) It opens toward the inside of gear room 6 (arrangement area of gears 51-53).

  Therefore, it is possible to avoid a situation in which a buildup portion is provided on the rear side wall 45 of the cylinder block 4 and a lubricating oil passage is formed in the buildup portion to retract the motor generator 3 forward or left of the engine 21. When the motor generator 3 is retracted to the front or left of the engine 21, the motor generator 3 may be largely protruded to the front or left of the engine 21. As a result, not only interference with various auxiliary equipment (for example, a cooling water pump, a power steering pump, an air conditioner compressor, etc.) around the engine 21 is caused, but the overall length and width of the engine 21 are likely to be increased. However, according to the present embodiment, since it is not necessary to dispose the lubricating oil passage (the buildup portion) in the cylinder block 4, the motor generator 3 may be disposed close to the gear chamber 6 at the rear of the engine 21. it can. Further, the gear mechanism 5 can be disposed in the rear of the engine 21 in close proximity to the motor generator 3.

  That is, according to the present embodiment, it is possible to effectively avoid a situation in which the full length and the full width of the engine 21 are expanded. As a result, it is possible to reduce the size and weight of the engine 21 and to make the power train 2 more compact.

  As mentioned above, although embodiment of this invention was described, embodiment mentioned above is shown as an example, and limiting the scope of invention is not intended. Such novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

  For example, as shown in FIG. 5, the gear shaft 54 (first gear shaft 56) has radiation extending radially from the hole 56a in addition to the hole 56a (second passage 12) penetrating the axial center. The holes 56b and 56c may be formed. The radiation holes 56 b and 56 c are opened at the outer peripheral portion of the first gear shaft 56 so as to supply lubricating oil to the surface of the idle gear 53 (first idle gear 55). Specifically, the position facing the gap between the peripheral edge of the mounting hole 42 and the first idle gear 55, and the gap between the peripheral edge of the first support hole 71 and the first idle gear 55 The openings 56d and 56e are formed at the positions where

  Thus, the radiation holes 56b and 56c are opened toward the meshing portion between the first idle gear 55 and the adjacent gear (for example, the crank gear 51). Lubricating oil is supplied to the surface of the first idle gear 55 by forming at least one such radiation hole 56b, 56c. Then, lubricating oil is supplied to the meshing portion between the first idle gear 55 and the second idle gear 57 and the crank gear 51 by the centrifugal force accompanying the rotation of the first idle gear 55.

  However, the number of radiation holes, the formation position and the opening position are not limited to the embodiment shown in FIG. For example, instead of or in addition to the radiation holes 56b and 56c, a radiation hole may be formed which opens on the side of the second idle gear 57 of the first gear shaft 56. Thus, lubricating oil can be more efficiently supplied to the meshing portion between the first idle gear 55 and the second idle gear 57 and the crank gear 51.

  Further, in the present embodiment, as an example, the inner diameters (diameters) of the four passages 11 to 14 are substantially matched. However, in order to vigorously eject the lubricating oil from the opening 14 a of the lubricating oil passage 10, the diameter (diameter) of the opening 14 a of the fourth passage 14 is at least the diameter (pore diameter) of the front portion of the opening 14 a The following should just be. For example, as shown in FIG. 6, the fourth passage 14 may be tapered from the front portion of the opening 14a. Further, as shown in FIG. 7, the entire fourth passage 14 may be tapered toward the opening 14a. Alternatively, as shown in FIG. 8, the inner diameter (pore diameter) of the fourth passage 14 may be smaller than the inner diameter (pore diameter) of the third passage 13.

  Further, in the present embodiment, the first to fourth four passages 11 to 14 are provided as an example, but a plurality of fourth passages 14 opening toward the gear chamber 6 may be provided. For example, as shown in FIG. 9, another passage (hereinafter, referred to as a fifth passage 15) in communication (branch) with the third passage 13 may be provided in addition to the fourth passage 14. In this case, the fifth passage 15 is opened in the gear cover 7 toward the gear chamber 6 in the vicinity of the meshing portion G2 of the first idle gear 55 and the second idle gear 57. As a result, the lubricating oil can be directly injected from the opening 15a of the fifth passage 15 to the meshing portion G2. The fifth passage 15 and the opening 15a are not limited to the aspect illustrated in FIG. 9, and may be, for example, in the same manner as the fourth passage 14 and the opening 14a illustrated in FIGS.

  However, the pressure of the lubricating oil injected from the opening 14 a of the fourth passage 14 may be greatly reduced by providing the fifth passage 15. In such a case, only the passage (fourth passage 14 in the present embodiment) for supplying the lubricating oil to the farthest meshing portion G1 with respect to the most upstream first passage 11 is provided, and the other passages are provided. (In the present embodiment, the fifth passage 15) is preferably omitted.

  In the present embodiment, the gear mechanism 5 (the gear group consisting of the gears 51 to 53 and the gear shaft 54) is provided at the rear (on the transmission 23 side) of the engine 21. The present invention is also applicable when the same gear mechanism is provided on the opposite side. Even in this case, as in the above-described embodiment, the lubricating oil passage (for example, the build-up portion) does not have to be disposed in the cylinder block 4, and the size and weight of the engine 21 is reduced. It is possible to achieve

  DESCRIPTION OF SYMBOLS 1 ... Gear lubricating mechanism, 2 ... power train, 3 ... motor generator, 3S ... motor shaft, 4 ... cylinder block, 5 ... gear mechanism, 6 ... gear chamber, 7 ... cover member (gear cover), 8 ... peripheral wall, 10 ... lubricating oil passage, 11 ... first passage, 12 ... second passage, 13 ... third passage, 14 ... fourth passage, 14a ... fourth passage opening, 15 ... fifth passage, 21 ... internal combustion engine (engine), 21 S ... crankshaft, 22 ... torque converter, 23 ... transmission, 24 ... drive plate, 21 S ... crankshaft, 41 ... main gallery, 42 ... mounting hole, 43 ... maintenance hole, 44 ... main Gallery plug, 45: wall portion (back wall), 46: hole, 51: crank gear, 52: motor gear, 53: idle gear, 54: non-rotating shaft (gear shaft), 55: first eye Lugear 56: first gear shaft 56a: holes 56b, 56c: radiation holes 56d, 56e: openings 57: second idle gear 58: second gear shaft 71: first support hole , 72: second support hole, 74: build-up portion, 81: fixed boss, G1: meshing portion of second idle gear and motor gear, G2: mesh of first idle gear and second idle gear Part, O1 ... axis of first gear shaft, O2 ... axis of second gear shaft, O3 ... axis of motor shaft.

Claims (8)

A crank gear attached to a crankshaft of an internal combustion engine mounted on a vehicle and rotatable with the crankshaft, and a motor gear attached to a motor shaft of a motor generator capable of starting the internal combustion engine and rotatable with the motor shaft A gear lubrication mechanism for lubricating a gear group having an idle gear for transmitting power between the crank gear and the motor gear,
A gear chamber adjacent to an axial wall of the crankshaft in the cylinder block and in which the gear group is disposed;
A cover member covering the gear chamber;
A lubricating oil passage for supplying lubricating oil to the gear chamber from a main gallery provided in the cylinder block;
The lubricating oil passage is
A first aisle branching from the main gallery;
A second passage in communication with the first passage and passing through the gear chamber through an interior of a gear shaft of the idle gear;
A third passage in communication with the second passage and passing through the interior of the cover member;
And a fourth passage having an opening communicating with the third passage, opening toward the gear chamber, and supplying the lubricating oil to the gear group. The gear lubrication mechanism according to claim 1, wherein the opening is opposed to the vicinity of a meshing portion between the idle gear and the adjacent gear. A plurality of idle gears are provided,
The second passage is provided on a gear shaft of the idle gear adjacent to the crank gear,
The gear lubrication mechanism according to claim 2, wherein the opening portion is opened at a position opposed to the vicinity of the meshing portion between the idle gear and the motor gear most distant from the crank gear. The gear lubrication mechanism according to claim 2 or 3, wherein a diameter of the opening is smaller than an inner diameter of the first passage, the second passage, and the third passage. The cover member extends along a line connecting the shaft center of the gear shaft and the shaft center of the motor shaft, and has a build-up portion protruding toward the transmission side.
The gear lubrication mechanism according to any one of claims 1 to 4, wherein the buildup portion includes the third passage inside. The gear group is provided on a wall of the cylinder block connected to the transmission,
A drive plate is attached to the crankshaft.
The gear shaft is located between the cylinder block and the drive plate,
The gear lubrication mechanism according to claim 5, wherein the buildup portion is thickened from the axial center of the gear shaft toward the axial center of the motor shaft. 7. The gear shaft according to any one of claims 1 to 6, wherein the gear shaft has a radiation hole that is open at an outer peripheral portion so as to supply the lubricating oil from the second passage toward the surface of the idle gear. Gear lubrication mechanism described in the section. The gear lubrication mechanism according to claim 7, wherein the radiation hole opens toward a meshing portion between the idle gear and the adjacent gear.

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