JP6496968B2 - Lubricating structure for clutch mechanism in power unit for vehicle - Google Patents

Description

  The present invention includes an internal combustion engine having a crankcase that rotatably supports a crankshaft, a transmission that has an input shaft extending in parallel with the crankshaft and is accommodated in the crankcase, the crankshaft, and the crankshaft A clutch mechanism disposed coaxially with the input shaft on the outside of the crankcase so as to disconnect and connect power transmission between the input shafts; a clutch cover that covers the clutch mechanism and is coupled to the crankcase; A clutch release comprising a release rod that is rotatably supported by the clutch cover, and a lifter piece that moves in the axial direction of the input shaft in accordance with the rotation of the release rod and switches between the connection and disconnection of the clutch mechanism. In particular, the present invention relates to an improvement in a lubricating structure for a clutch mechanism.

  A vehicle power unit in which lubricating oil is supplied to a clutch mechanism via a dedicated oil passage leading to an oil pump is known from Patent Document 1 and the like.

JP 2009-270701 A

  Incidentally, more effective lubrication of the clutch mechanism is required in order to cause the clutch mechanism to function properly in response to high output and high rotation of the internal combustion engine mounted on the vehicle. In the disclosed one, the clutch cover is provided with a dedicated oil passage for lubricating the clutch mechanism in addition to the oil passage for lubricating the transmission, which not only increases the number of processing steps but also the number of parts. An increase in this is also invited.

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a lubricating structure for a clutch mechanism in a vehicle power unit that can supply oil to the clutch mechanism with a simple structure while avoiding an increase in the number of processing steps and the number of parts. The purpose is to provide.

In order to achieve the above object, the present invention provides an internal combustion engine having a crankcase that rotatably supports a crankshaft, and a transmission that has an input shaft extending in parallel with the crankshaft and is accommodated in the crankcase. A clutch mechanism disposed coaxially with the input shaft on the outer side of the crankcase so as to disconnect and connect power transmission between the crankshaft and the input shaft, and the crankcase covering the clutch mechanism A clutch cover coupled to the clutch cover, a release rod rotatably supported by the clutch cover, and an axial movement of the input shaft according to the rotation of the release rod to switch the clutch mechanism between connection and disconnection. In a vehicle power unit comprising a clutch release mechanism composed of a lifter piece, the clutch cover A bottomed support cylinder portion that rotatably inserts a lower portion of the release rod extending vertically in the wall forms an oil flow passage with the release rod and opens an upper end of the oil flow passage. In this way, the release rod side end of the lifter piece that is formed in a shape that allows oil to flow from the oil flow passage to the clutch mechanism side is fitted to be movable in the axial direction. fitting hole to be is provided in the lower part of the supporting tube portion so as to communicate to the support cylindrical portion, upper opening edge of the front Symbol supporting cylinder unit, and a clutch cover side edge portion continuous to the inner wall of the clutch cover The first feature is that it comprises a clutch mechanism side edge disposed below the clutch cover side edge and disposed on the clutch mechanism side.

The present invention includes an internal combustion engine having a crankcase that rotatably supports a crankshaft, a transmission that has an input shaft extending in parallel with the crankshaft and is accommodated in the crankcase, the crankshaft, and the crankshaft A clutch mechanism disposed coaxially with the input shaft on the outside of the crankcase so as to disconnect and connect power transmission between the input shafts; a clutch cover that covers the clutch mechanism and is coupled to the crankcase; A clutch release comprising a release rod that is rotatably supported by the clutch cover, and a lifter piece that moves in the axial direction of the input shaft in accordance with the rotation of the release rod and switches between the connection and disconnection of the clutch mechanism. In a vehicle power unit comprising a mechanism, the inner wall of the clutch cover is A bottomed support tube portion that rotatably inserts the lower portion of the release rod is provided integrally with the release rod so as to form an oil flow passage and open an upper end of the oil flow passage, A fitting hole for fitting an end portion on the release rod side of the lifter piece formed in a shape that allows oil to flow from the oil flow passage to the clutch mechanism side so as to be movable in the axial direction is the support. A hollow portion is formed in the lower portion of the support cylinder portion so as to communicate with the inside of the cylinder portion, and a part of the outer periphery of the release rod is accommodated above the support cylinder portion on the inner wall of the clutch cover. A protruding wall portion connected to one side facing the rotational direction of the input shaft when the vehicle moves forward of both side surfaces of the hollow portion protrudes from the inner wall of the clutch cover. A second feature in that it is formed integrally with the latch cover.

According to the present invention, in addition to the configuration of the second feature, the clutch cover extends at least upward from a clutch mechanism protection portion formed in a hook shape so as to cover the clutch mechanism from the outside in the axial direction. An extension portion extending outward from the clutch mechanism protection portion, and the cylindrical portion of the lifter piece is formed in a bottomed cylindrical shape having the end wall portion on one end side. The projecting portion that forms the insertion hole connected to the recess portion is inserted into the other end portion of the cylindrical portion so as to insert a srod that is fitted with a partition cap that forms the oil passage between the cylindrical end portion and the end wall portion. A third feature is that the extension portion is formed integrally with the upper portion of the extension portion.

The present invention includes an internal combustion engine having a crankcase that rotatably supports a crankshaft, a transmission that has an input shaft extending in parallel with the crankshaft and is accommodated in the crankcase, the crankshaft, and the crankshaft A clutch mechanism disposed coaxially with the input shaft on the outside of the crankcase so as to disconnect and connect power transmission between the input shafts; a clutch cover that covers the clutch mechanism and is coupled to the crankcase; A clutch release comprising a release rod that is rotatably supported by the clutch cover, and a lifter piece that moves in the axial direction of the input shaft in accordance with the rotation of the release rod and switches between the connection and disconnection of the clutch mechanism. In a vehicle power unit comprising a mechanism, the inner wall of the clutch cover is A bottomed support tube portion that rotatably inserts the lower portion of the release rod is provided integrally with the release rod so as to form an oil flow passage and open an upper end of the oil flow passage, A fitting hole for fitting an end portion on the release rod side of the lifter piece formed in a shape that allows oil to flow from the oil flow passage to the clutch mechanism side so as to be movable in the axial direction is the support. A locking recess that is provided in a lower portion of the support cylinder so as to communicate with the inside of the cylinder, and that engages the release rod with the release piece, and extends in the axial direction of the release rod and has a lower end that is the locking recess. a shaft hole which opens, that the communication hole so as to span between the outer periphery and the shaft hole of the release rod extends radially of the release rod is provided first to the It is a feature of the.

According to the present invention, in addition to the structure of the fourth feature, the release hole is provided below the upper end opening edge of the support cylinder portion so that the communication hole passes the outer end of the communication hole through the oil flow passage. It is a fifth feature that it is provided on the rod.

According to the present invention, in addition to the configuration of the fifth feature, a bearing disposed between an upper end opening edge of the support cylinder and the fitting hole is interposed between the release rod and the support cylinder. A sixth feature is that the communication hole is disposed above the bearing.

The present invention includes an internal combustion engine having a crankcase that rotatably supports a crankshaft, a transmission that has an input shaft extending in parallel with the crankshaft and is accommodated in the crankcase, the crankshaft, and the crankshaft A clutch mechanism disposed coaxially with the input shaft on the outside of the crankcase so as to disconnect and connect power transmission between the input shafts; a clutch cover that covers the clutch mechanism and is coupled to the crankcase; A clutch release comprising a release rod that is rotatably supported by the clutch cover, and a lifter piece that moves in the axial direction of the input shaft in accordance with the rotation of the release rod and switches between the connection and disconnection of the clutch mechanism. In a vehicle power unit comprising a mechanism, the inner wall of the clutch cover is A bottomed support tube portion that rotatably inserts the lower portion of the release rod is provided integrally with the release rod so as to form an oil flow passage and open an upper end of the oil flow passage, A fitting hole for fitting an end portion on the release rod side of the lifter piece formed in a shape that allows oil to flow from the oil flow passage to the clutch mechanism side so as to be movable in the axial direction is the support. The lifter piece is provided in a lower part of the support cylinder part so as to communicate with the cylinder part, and the lifter piece has an end wall part at one end part on the release rod side and has an oil passage for a clutch mechanism inside and is cylindrical. A cylindrical portion to be formed, a disc-shaped engaging portion that is rotatably engaged with the release rod, and a diameter smaller than that of the cylindrical portion to connect between the engaging portion and the central portion of the end wall portion. A plurality of oil inflow holes which are formed so as to integrally have a real rod-like neck portion and which are inclined so as to approach each other toward the clutch mechanism oil passage side. The seventh feature is provided.

According to the present invention, in addition to the configuration of the seventh feature, the clutch mechanism is coupled and coupled to a plurality of drive friction plates that engage with a clutch outer to which power is transmitted from the crankshaft side, and the input shaft. A plurality of driven friction plates that are engaged with a clutch inner and arranged between the plurality of driving friction plates, and the portion corresponding to either the driving friction plate or the driven friction plate in the axial direction. An eighth feature is that the cylindrical portion of the lifter piece is provided with an oil ejection hole extending in the radial direction of the cylindrical portion.

According to the present invention, in addition to the configuration of the eighth feature, the input shaft is formed in a cylindrical shape so as to coaxially have an oil passage for transmission for supplying oil to the transmission, and the lifter piece A cylindrical portion having the end wall portion at one end thereof is formed into a bottomed cylindrical shape, and the other end portion of the cylindrical portion opposite to the end wall portion is fitted to the input shaft, A partition cap that forms the clutch mechanism oil passage between the wall portion and isolates the clutch mechanism oil passage from the transmission oil passage is attached to the other end of the cylindrical portion. Is the ninth feature.

According to the present invention, in addition to any one of the configurations of the second to ninth features, an upper end opening edge of the support cylinder portion includes a clutch cover side edge continuous with an inner wall of the clutch cover, and the clutch cover side edge. A tenth feature is that it comprises a clutch mechanism side edge disposed below the portion and disposed on the clutch mechanism side.

In addition to any one of the configurations of the first to tenth aspects of the present invention, the release rod is formed so as to have a central small-diameter portion that is smaller in diameter than both axial end portions thereof. An eleventh feature is that an intermediate portion in the longitudinal direction of the central small-diameter portion is disposed at a position corresponding to an upper end opening edge portion of the support cylinder portion.

  Furthermore, in addition to any of the configurations of the first to eleventh features, the present invention provides the lifter piece between the end on the release rod side of the lifter piece and the lower portion of the support cylinder. A twelfth feature is that a surrounding annular seal member is interposed.

According to the first , second, fourth, and seventh features of the present invention, an oil flow passage having an open upper end is formed in the bottomed support cylinder portion integrally provided on the inner wall of the clutch cover. The lower part of the release rod that extends in the vertical direction is inserted so as to be formed in between, and the end of the release rod side of the lifter piece that allows oil to flow from the oil flow passage to the clutch mechanism side is fitted Since the hole is provided in the lower part of the support cylinder part, the oil scattered from the rotating clutch mechanism is collected and stored in the oil flow passage while the release rod is securely held by the support cylinder part, and the support cylinder part In addition, the oil in the oil flow passage can be reused for lubrication between the lifter pieces and the lubrication of the clutch mechanism. In addition, the lubrication between the support cylinder and the lifter piece and the lubrication of the clutch mechanism can be promoted by effectively utilizing the height difference in the oil flow passage that is long in the vertical direction. Further, it is not necessary to provide an oil passage exclusively for the clutch mechanism in the clutch cover, and oil can be supplied to the clutch mechanism with a simple structure while avoiding an increase in the number of processing steps and the number of parts .

In addition , according to the first and tenth features of the present invention, by lowering the clutch mechanism side edge portion arranged on the clutch mechanism side of the upper end opening edge portion of the support cylinder portion, It can be made easier to flow in.

According to the second feature of the present invention, when the vehicle moves forward, of both side surfaces of the recessed portion formed in the inner wall of the clutch cover so as to accommodate a part of the outer periphery of the release rod above the support cylinder portion. Since the protruding wall portion that protrudes from the inner wall of the clutch cover is connected to one side surface facing the rotation direction of the input shaft, the recess portion can be formed by colliding oil scattered from the clutch mechanism with the protruding wall portion. Thus, the amount of oil flowing into the oil flow passage can be increased by guiding oil into the oil flow passage.

According to the third feature of the present invention, the protrusion that forms the insertion hole connected to the recess so as to insert the release rod extends at least upward from the clutch mechanism protection portion formed in a hook shape. Since it is integrally formed on the upper portion of the hood, the protruding wall portion can be made longer upward to improve oil recovery efficiency.

According to the fourth aspect of the present invention, the release rod is formed so as to have a shaft hole that opens the lower end portion in the locking recess for engaging the lifter piece, thereby reducing the weight of the release rod. . In addition, the inner end of the communication hole that extends in the radial direction of the release rod and opens to the outer periphery of the release rod communicates with the shaft hole, so that oil stays in the release rod and the amount of oil staying increases. It is possible to form an oil flow path to the lifter piece side.

According to the fifth aspect of the present invention, since the outer end of the communication hole communicates with the oil flow passage, the oil is efficiently introduced into the shaft hole from the oil flow passage through the communication hole, and the oil toward the lifter piece side is obtained. Supply can be performed efficiently.

According to the sixth aspect of the present invention, since the communication hole is disposed above the bearing interposed between the release rod and the support cylinder, oil for lubricating the bearing is secured and the bearing is mounted. While being lubricated, the oil above the communication hole in the oil flow passage can be used for lubrication of the lifter piece and the clutch mechanism side.

According to the seventh aspect of the present invention, the lifter piece includes a cylindrical portion having an oil passage for a clutch mechanism therein, a disc-shaped engaging portion that engages with a release rod, and an end wall of one end portion of the cylindrical portion. And the neck part connecting the central part of the engaging part and the center part of the engaging part, and guiding the oil from the release rod side to the oil passage for the clutch mechanism in the cylindrical part while ensuring the strength by making the neck part a solid bar shape In addition, since the plurality of oil inflow holes provided in the end wall portion are inclined so as to approach each other toward the clutch mechanism oil passage side, the diameter of the oil inflow hole can be ensured.

According to the eighth aspect of the present invention, the oil ejection hole corresponding to the driving friction plate and the driven friction plate in the clutch mechanism in the axial direction extends in the cylindrical portion of the lifter piece in the radial direction of the cylindrical portion. Thus, the clutch mechanism can be effectively lubricated by ejecting oil toward the drive friction plate and the driven friction plate.

According to the ninth aspect of the present invention, the cylindrical portion of the lifter piece is formed in a bottomed cylindrical shape, and the other end portion of the cylindrical portion is fitted to an input shaft having a transmission oil passage at the same time. Since the partition cap for isolating the clutch mechanism oil passage from the transmission oil passage is attached to the other end portion of the cylindrical portion, a sufficient amount of oil supplied to the clutch mechanism can be secured.

According to the eleventh feature of the present invention, since the longitudinal intermediate portion of the central thin diameter portion of the release rod is located at a position corresponding to the upper end opening of the support cylinder portion, the release rod is reduced in weight and supported. By increasing the interval between the inner periphery of the upper end opening of the cylindrical portion and the outer periphery of the release rod, it is possible to improve the inflow of oil into the oil flow passage and increase the amount of oil remaining in the oil flow passage.

  Further, according to the twelfth feature of the present invention, since the end of the lifter piece on the release rod side is fitted to the lower part of the support cylinder part via the annular seal member, the release rod is supplied to the lifter piece. It is possible to suppress the leakage of the amount of oil that is generated and guide a sufficient amount of oil to the lifter piece side.

FIG. 3 is a right side view of a power unit mounted on a motorcycle. It is an expansion right view of a power unit. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is an enlarged view of a portion indicated by an arrow 4 in FIG. 3. It is sectional drawing of the clutch cover which follows the 5-5 line of FIG. It is the perspective view which looked at the clutch cover from the inner side.

  Embodiments of the present invention will be described with reference to the accompanying FIGS. In the following description, front and rear, left and right, and top and bottom refer to directions viewed from a passenger who rides a motorcycle.

  First, in FIG. 1, a motorcycle, which is a vehicle, is equipped with a power unit P disposed between a front wheel WF and the rear wheel WR so as to exert power for driving a rear wheel WR.

  2 and 3 together, an internal combustion engine E that constitutes a part of the power unit P includes a crankcase 12 that rotatably supports a crankshaft 11 extending in the vehicle width direction, A cylinder body 13 coupled to the front upper portion and extending slightly rearwardly, a cylinder head 14 coupled to the upper portion of the cylinder body 13, and coupled to the upper portion of the cylinder head 14 so as to cover the cylinder head 14 from above The head cover 15 is configured to be a single cylinder. The crankcase 12 includes left and right crankcase halves 17 and 18 that are coupled by a coupling surface 16 that extends along a plane orthogonal to the axis of the crankshaft 11.

  A piston 20 connected to the crankshaft 11 via a connecting rod 21 is slidably fitted in a cylinder bore 19 of the cylinder body 13. Further, the crankshaft 11 passes through the left crankcase half 17 with the first metal bearing 22 interposed between the left crankcase half 17 and the right crankcase half 18. A second metal bearing 23 is interposed therebetween, and the right crankcase half 18 is rotatably passed through.

  The power unit P includes, in addition to the internal combustion engine E, a transmission 25 housed in the crankcase 12 so as to change the rotational power of the internal combustion engine E stepwise, and the transmission 25 and the crank A clutch mechanism 26 that disconnects and connects power transmission between the shafts 11, a primary gear reduction mechanism 27 that transmits the power of the crankshaft 11 to the clutch mechanism 26 side, and between the primary gear reduction mechanism 27 and the clutch mechanism 26. And a damper rubber 28 provided.

  The transmission 25 is provided between an input shaft 29 extending in parallel with the crankshaft 11 so that rotational power from the crankshaft 11 is input, and an output shaft 30 extending in parallel with the input shaft 29. A gear train of a plurality of shift stages that can be selectively established is provided. In this embodiment, the first gear train G1, the second gear train G2, the third gear train G3, the fourth gear train, and the like. A speed gear train G4, a fifth gear train G5, and a sixth gear train G6 are provided between the input shaft 29 and the output shaft 30.

  The input shaft 29 is coaxially formed with a transmission oil passage 31 for supplying lubricating oil to the transmission 25, and the left end portion of the input shaft 29 is formed on the left crank. The case half 17 is rotatably supported via a first ball bearing 32. The input shaft 29 passes through the right crankcase half 18 in a rotatable manner, and a second ball bearing 33 with a seal is interposed between the input shaft 29 and the right crankcase half 18. The Further, the output shaft 30 passes through the left crankcase half 27 rotatably, and an annular first seal member 34 and the first seal member 34 are interposed between the output shaft 30 and the left crankcase half 17. A third ball bearing 35 disposed inward of the seal member 34 is interposed. Further, the right end portion of the output shaft 30 is rotatably supported by the right crankcase half 18 via a fourth ball bearing 36 with a seal.

  A drive sprocket 37 is fixed to the projecting end of the output shaft 30 projecting outward from the left crankcase 12, and a drive for transmitting power to the rear wheel WR is secured to the drive sprocket 37. A chain (not shown) is wound around.

  A peripheral portion of a holder 38 protruding rightward from the crankcase 12 is coupled to the right crankcase half 18 by a plurality of bolts 39, and a clutch cover 40 is coupled to the holder 38 by a plurality of bolts 41. The right crankcase half 28, the holder 38 and the clutch cover 40 form a clutch chamber 42.

  Referring also to FIG. 4, the clutch chamber 42 accommodates the primary gear reduction mechanism 27 and the clutch mechanism 26, and the primary gear reduction mechanism 27 includes the right crankcase half 18. A primary drive gear 43 fixed to the right end portion of the crankshaft 11 projecting from the primary drive gear 43, and a primary driven gear 44 that meshes with the primary drive gear 43 and is rotatably supported by the input shaft 29. A cylindrical sleeve 45 is fitted on the outer periphery of the input shaft 29 at a portion corresponding to the primary gear reduction mechanism 27 with the direction along the axis of the input shaft 29 being constant. A first needle bearing 46 is interposed between the inner periphery of the primary driven gear 44.

  The clutch mechanism 26 is configured as a multi-plate type, and includes a clutch outer 47 that is linked and connected to the primary driven gear 44 via a damper rubber 28, and a clutch inner 48 that is linked and connected to the input shaft 29. A plurality of drive friction plates 49 engaged with the clutch outer 47 so as not to rotate relative to each other, and a plurality of drive friction plates 49 arranged between the drive friction plates 49 and engaged with the clutch inner 48 so as not to rotate relative to each other. A plurality of driven friction plates 50, a plurality of the driving friction plates 49, and the driving friction plates 49, which are friction plates disposed at one end of the driven friction plates 50 along the axial direction of the clutch inner 48. The pressure receiving plate 51 formed integrally with the clutch inner 48 and the plurality of the driving friction plates 49 and the driven friction plates 50 are arranged in the pressure receiving plate 51. And a plurality of spring biasing forces that bias the pressing plate 52 to the side where the driving friction plate 49 and the driven friction plate 50 are pressed against the pressure receiving plate 51. A clutch spring 53.

  The clutch outer 47 is formed in a hook shape that opens to the opposite side of the primary driven gear 44, and is connected to the primary driven gear 44 via the damper rubber 28. Further, the outer peripheral portions of the plurality of drive friction plates 49 are engaged with the inner periphery of the clutch outer 47 while allowing the axial movement and disabling relative rotation.

  The clutch inner 48 is formed in a cylindrical shape so as to be coaxially disposed in the clutch outer 47, and the inner peripheral portion of the plurality of driven friction plates 50 can move in the axial direction and relatively rotate. It is impossible to engage with the outer periphery of the clutch inner 48.

  Such disconnection / connection of the power transmission by the clutch mechanism 26 is such that the release rod 55 is rotatably supported by the clutch cover 40 so as to extend in the vertical direction, and the release rod 55 is rotated according to the rotation of the release rod 55. A lever that is switched by a clutch release mechanism 57 including a lifter piece 56 that moves in the axial direction of the input shaft 29, and is fixed to an outer end portion of the release rod 55 protruding upward from the clutch cover 40. 58, the clutch switching operation force by the motorcycle occupant is input.

  The inner surface of the central portion of the pressing plate 52 is supported by the lifter piece 56 via a thrust bearing 59, and the pressing plate 52 resists the spring force of the clutch spring 53 by being pressed by the lifter piece 56. The clutch mechanism 26 is cut off in accordance with the displacement of the pressure receiving plate 51 away from the pressure receiving plate 51, and the pressing plate 52 is moved into the clutch in response to the release of the operation force applied to the lifter piece 56. The clutch mechanism 26 enters a power transmission state in accordance with the displacement to the side closer to the pressure receiving plate 51 by the spring force of the spring 53.

  Referring to FIGS. 5 and 6 together, the inner wall of the clutch cover 40 has a bottomed support cylinder portion 61 into which the lower portion of the release rod 55 is rotatably inserted. The oil flow passage 62 is formed at the same time, and the upper end of the oil flow passage 62 is opened integrally. In addition, an end portion on the release rod 55 side of the lifter piece 56 that is formed in a shape that allows oil to flow from the oil flow passage 62 to the clutch mechanism 26 side is provided at a lower portion of the support cylinder portion 61. A fitting hole 63 that is fitted so as to be movable in the axial direction is provided so as to communicate with the inside of the support cylinder portion 61.

  The release rod 55 is formed so as to have a central small diameter portion 55a having a smaller diameter than both axial end portions thereof, and a middle portion in the longitudinal direction of the central small diameter portion 55a is formed on the support cylinder portion 61. It is arranged at a position corresponding to the upper end opening edge 64.

  In addition, an upper end opening edge 64 of the support cylinder 61 is disposed below the clutch cover side edge 64a that is continuous with the inner wall of the clutch cover 40, and below the clutch cover side edge 64a. The clutch mechanism side edge portion 64b is arranged.

  A recess 65 is formed on the inner wall of the clutch cover 40 and accommodates a part of the outer periphery of the release rod 55 above the support cylinder 61. Of the both side surfaces 65a and 65b of the recess 65, A protruding wall portion 66 connected to one side surface 65a facing the side facing the rotational direction 67 of the input shaft 29 when the vehicle moves forward is provided integrally with the clutch cover 40 so as to protrude from the inner wall of the clutch cover 40. It is done.

  In addition, the clutch cover 40 includes a clutch mechanism protection portion 40a formed in a bowl shape so as to cover the clutch mechanism 26 from the outside in the axial direction, and at least outward from the clutch mechanism protection portion 40a so as to extend upward. In this embodiment, the extension portion 40b is formed so as to extend rearward and upward of the clutch mechanism protection portion 40a. A protrusion 69 that forms an insertion hole 68 connected to the recess 65 is integrally formed on the upper portion of the extending portion 40b.

  Further, a locking recess 71 for engaging the lifter piece 56 with the release rod 55, and a shaft hole extending in the axial direction of the release rod 55 and having a lower end opened to the locking recess 71 and the upper end closed. 72 and a plurality of communication holes 73 extending in the radial direction of the release rod 55 so as to extend between the outer periphery of the release rod 55 and the shaft hole 72, and the communication holes 73 are formed in the oil flow passage 62. The release rod 55 is provided below the upper end opening edge portion 64 of the support cylinder portion 61 so as to pass through the outer end of the communication hole 73.

  A second needle bearing 74, which is a bearing disposed between the upper end opening edge 64 of the support cylinder 61 and the fitting hole 63, is interposed between the release rod 55 and the support cylinder 61, and The communication hole 73 is disposed above the second needle bearing 74. In order to receive the second needle bearing 74 from below, an inward flange 61 a is integrally formed on the inner surface of the support cylinder 61 at a position above the fitting hole 63. In addition, a third needle bearing 75 and an annular second seal member disposed outside the third needle bearing 75 are provided between the protrusion 69 and the protrusion 69 in the insertion hole 68. 76 is interposed.

  By the way, the lifter piece 56 has an end wall portion 56 a at one end portion on the release rod 55 side and a clutch mechanism oil passage 77 inside, and a cylindrical portion 56 b formed in a cylindrical shape, and the release rod 55. A disc-shaped engaging portion 56c that is rotatably engaged with the cylindrical portion 56b, and a neck portion 56d that has a smaller diameter than the cylindrical portion 56b and connects between the engaging portion 56c and the central portion of the end wall portion 56a. And an outward flange 56e projecting radially outward from the outer periphery of the intermediate portion of the cylindrical portion 56b so as to interpose the thrust bearing 59 between the pressing plate 52 of the clutch mechanism 26. A plurality of oil inflow holes 7 that are formed so as to be inclined toward the end wall portion 56a toward the clutch mechanism oil passage 77 side. It is provided.

  Further, a plurality of oil jets extending in the radial direction of the cylindrical portion 56b in the cylindrical portion 56b of the lifter piece 56 at portions corresponding to the driving friction plate 49 and the driven friction plate 50 of the clutch mechanism 26 in the axial direction. A hole 79 is provided.

  By the way, the cylindrical portion 56b is formed in a bottomed cylindrical shape having the end wall portion 56a at one end portion thereof, and the other end portion of the cylindrical portion 56b opposite to the end wall portion 56a is a transmission. The clutch mechanism oil passage 77 is formed between the end shaft portion 56a and the end shaft portion 56a. The clutch mechanism oil passage 77 is formed in the transmission oil. A partition cap 80 isolated from the passage 31 is attached to the other end of the cylindrical portion 56b.

  When the lifter piece 56 is fitted to the input shaft 29, the lifter piece 56 rotates together with the input shaft 29. The engaging portion 56c is rotatably engaged with the lower portion of the release rod 55. A locking recess 71 and an insertion slit 81 into which the neck portion 56 d is inserted are formed, and the lifter piece 56 that rotates together with the input shaft 29 is rotatably engaged with the lower portion of the release rod 55. Become.

  Further, an annular third seal member 82 surrounding the lifter piece 56 is interposed between the end of the lifter piece 56 on the release rod 55 side and the lower portion of the support cylinder 61.

  Next, the operation of this embodiment will be described. The bottomed support cylinder portion 61 into which the lower portion of the release rod 55 extending in the vertical direction is rotatably inserted into the inner wall of the clutch cover 40 is connected to the release rod 55. An oil flow passage 62 is formed between them, and the upper end of the oil flow passage 62 is opened so as to be integrated with the oil flow passage 62 so that the oil can flow from the oil flow passage 62 to the clutch mechanism 26 side. A fitting hole 63 for fitting the end of the lifter piece 56 on the release rod 55 side so as to be movable in the axial direction is provided in the lower part of the supporting cylinder part 61 so as to communicate with the inside of the supporting cylinder part 61. Therefore, the oil splashed from the rotating clutch mechanism 26 is collected and stored in the oil flow passage 62 while the release rod 55 is securely held by the support cylinder 61. , Lubrication and between the support tube portion 61 and the lifter piece 56, it is possible to reuse the oil in the oil flow path 62 to lubricate the clutch mechanism 26 through the oil inlet 76 and oil injection holes 79. Moreover, the lubrication between the support cylinder 61 and the lifter piece 56 and the lubrication of the clutch mechanism 26 can be promoted by effectively utilizing the height difference in the oil flow passage 62 that is long in the vertical direction. Further, it is not necessary to provide an oil passage exclusively for the clutch mechanism 26 in the clutch cover 40, and oil can be supplied to the clutch mechanism 26 with a simple structure while avoiding an increase in the number of processing steps and the number of parts.

  Further, the release rod 55 is formed so as to have a central small diameter portion 55a having a smaller diameter than both axial end portions thereof, and a longitudinal intermediate portion of the central small diameter portion 55a is an upper end of the support cylinder portion 61. Since it is disposed at a position corresponding to the opening edge portion 64, the distance between the inner periphery of the upper end opening portion of the support cylinder portion 61 and the outer periphery of the release rod 55 is increased while reducing the weight of the release rod 55, and the oil flow passage. While improving the inflow property of the oil into 62, the oil retention amount in the oil flow path 62 can be increased.

  An upper end opening edge portion 64 of the support cylinder portion 61 is disposed below the clutch cover side edge portion 64a that is continuous with the inner wall of the clutch cover 40, and below the clutch cover side edge portion 64a. Since the clutch mechanism side edge portion 64b is disposed, the oil flow passage 62 is formed by lowering the clutch mechanism side edge portion 64b disposed on the clutch mechanism 26 side of the upper end opening edge portion 64 of the support cylinder portion 61. The oil can be more easily flowed into the inside.

  In addition, a recess 65 is formed on the inner wall of the clutch cover 40 so as to accommodate a part of the outer periphery of the release rod 55 above the support cylinder 61. Of the both side surfaces 65a and 65b of the recess 65, the vehicle A protruding wall portion 66 connected to one side surface 65a facing the side facing the rotational direction 67 of the input shaft 29 at the time of forward movement is provided integrally with the clutch cover 40 so as to protrude from the inner wall of the clutch cover 40. Therefore, by causing the oil scattered from the clutch mechanism 26 to collide with the protruding wall portion 66, the amount of oil flowing into the oil flow passage 62 can be increased so as to guide the oil from the recess 65 into the oil flow passage 62. .

  In addition, the clutch cover 40 covers the clutch mechanism 26 from the outside in the axial direction and forms a hook-like clutch mechanism protection portion 40a. The clutch cover 40 extends outward from the clutch mechanism protection portion 40a so as to extend at least upward. A projecting portion 69 that integrally has an extending portion 40b that extends and that forms an insertion hole 68 that is continuous with the recessed portion 65 so as to insert the release rod 55 is integrally formed on the upper portion of the extending portion 40b. Since it is formed, it is possible to increase the oil recovery efficiency by making the protruding wall 66 longer upward.

  Further, a locking recess 71 for engaging the lifter piece 56 with the release rod 55, a shaft hole 72 extending in the axial direction of the release rod 55 and opening the lower end portion into the locking recess 71, and closing the upper end. Since the release rod 55 is provided with a communication hole 73 extending in the radial direction of the release rod 55 so as to extend between the outer periphery of the release rod 55 and the shaft hole 72, the release rod 55 can be reduced in weight. The oil can be retained in the interior to increase the amount of oil retained, and an oil distribution path to the lifter piece 56 side can be formed.

  Further, since the communication hole 73 is provided in the release rod 55 below the upper end opening edge portion 64 of the support cylinder portion 61 so as to allow the outer end of the communication hole 73 to pass through the oil flow passage 62. Oil can be efficiently flowed into the shaft hole 72 from the flow passage 62 through the communication hole 73, and oil can be efficiently supplied to the lifter piece 56 side.

  A second needle bearing 74 disposed between the upper end opening edge 64 of the support cylinder 61 and the fitting hole 63 is interposed between the release rod 55 and the support cylinder 61 and the communication hole. 73 is disposed above the second needle bearing 74, so that the oil for lubricating the second needle bearing 74 is secured and the second needle bearing 74 is lubricated, while the oil flow passage 62 is filled with oil. Therefore, the oil above the communication hole 73 can be used for lubrication on the lifter piece 56 and the clutch mechanism 26 side.

  The lifter piece 56 has an end wall portion 56a at one end portion on the release rod 55 side and a clutch mechanism oil passage 77 inside, and a cylindrical portion 56b formed in a cylindrical shape, and the release rod 55. A disc-shaped engaging portion 56c that is rotatably engaged with the cylindrical portion 56b, and a neck portion 56d that has a smaller diameter than the cylindrical portion 56b and connects between the engaging portion 56c and the central portion of the end wall portion 56a. And the end wall portion 56a is provided with a plurality of oil inflow holes 78 inclined toward each other toward the clutch mechanism oil passage 77 side. The oil from the release rod 55 side can be guided to the oil passage 77 for the clutch mechanism in the cylindrical portion 56b while ensuring the strength as a solid rod shape. Since a plurality of oil inflow ports 78 provided in the part 56a is inclined so as to approach to each other toward the oil passage 77 side clutch mechanism, it is possible to secure the size of the oil inlet hole 78.

  The clutch mechanism 26 is engaged with a plurality of drive friction plates 49 that are engaged with a clutch outer 47 to which power is transmitted from the crankshaft 11 side, and a clutch inner 48 that is linked to and connected to the input shaft 29. A plurality of driven friction plates 50 overlapped between the plurality of driving friction plates 49, and the lifter piece 56 is disposed at a portion corresponding to the driving friction plates 49 and the driven friction plates 50 in the axial direction. Since the oil injection hole 79 extending in the radial direction of the cylindrical portion 56b is provided in the cylindrical portion 56b, the clutch mechanism 26 can be effectively discharged by discharging oil toward the driving friction plate 49 and the driven friction plate 50. Lubrication is possible.

  The input shaft 29 of the transmission 25 is formed in a cylindrical shape so that it has a transmission oil passage 31 for supplying oil to the transmission 25 coaxially, and the cylindrical portion 56b of the lifter piece 56 has one end thereof. The end wall portion 56a is formed in a bottomed cylindrical shape, and the other end portion of the cylindrical portion 56b opposite to the end wall portion 56a is fitted to the input shaft 29, and the end wall A partition cap 80 that forms the clutch mechanism oil passage 77 with the portion 56a and isolates the clutch mechanism oil passage 77 from the transmission oil passage 31 is provided at the other end of the cylindrical portion 56b. Therefore, the amount of oil supplied to the clutch mechanism 26 can be sufficiently secured.

  Further, an annular third seal member 82 surrounding the lifter piece 56 is interposed between the end of the lifter piece 56 on the release rod 55 side and the lower portion of the support cylinder 61. Thus, leakage of the amount of oil supplied from the release rod 55 to the lifter piece 56 can be suppressed, and a sufficient amount of oil can be guided to the lifter piece 56 side.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

DESCRIPTION OF SYMBOLS 11 ... Crankshaft 12 ... Crankcase 25 ... Transmission 26 ... Clutch mechanism 29 ... Input shaft 31 ... Transmission oil passage 40 ... Clutch cover 40a ... Clutch Mechanism protection part 40b ... extension part 47 ... clutch outer 48 ... clutch inner 49 ... driving friction plate 50 ... driven friction plate 55 ... release rod 55a ... center small diameter part 56 ... Lifter piece 56a ... End wall part 56b ... Cylindrical part 56c ... Engagement part 56d ... Neck part 57 ... Clutch release mechanism 61 ... Support cylinder part 62 ... Oil Flow path 63 ... fitting hole 64 ... upper end opening edge 64a of the support cylinder part ... clutch cover side edge part 64b ... clutch mechanism side edge part 65 ... depressions 65a, 65b ... -Side surface 66 of the recess -Projection wall 67 ... rotational direction 68 ... insertion hole 69 ... projection 71 ... locking recess 72 ... shaft hole 73 ... communication hole 74 ... second bearing Needle bearing 77... Clutch mechanism oil passage 78... Oil inflow hole 79... Oil ejection hole 80... Partition cap 82. Engine P ... Power unit

Claims (12)

An internal combustion engine (E) having a crankcase (12) that rotatably supports the crankshaft (11), and an input shaft (29) extending in parallel with the crankshaft (11), the crankcase (12) The transmission (25) housed in the input shaft (outside of the crankcase (12) so as to cut off and connect power transmission between the crankshaft (11) and the input shaft (29). 29) a clutch mechanism (26) arranged coaxially, a clutch cover (40) covering the clutch mechanism (26) and coupled to the crankcase (12), and rotating to the clutch cover (40) The release rod (55) that is freely supported, and the axial movement of the input shaft (29) according to the rotation of the release rod (55) move the clutch mechanism (26). The vehicle power unit and a composed clutch release mechanism (57) at lifter piece for switching contact (56),
A bottomed support tube portion (61) for rotatably inserting a lower portion of the release rod (55) extending in the vertical direction into an inner wall of the clutch cover (40) is disposed between the release rod (55). An oil flow passage (62) is formed and integrally provided so as to open an upper end of the oil flow passage (62), and the oil flows from the oil flow passage (62) to the clutch mechanism (26) side. A fitting hole (63) for fitting the end of the lifter piece (56) on the release rod (55) side so as to be movable in the axial direction is formed in the shape of the support cylinder (61). Provided in the lower part of the support cylinder part (61) so as to communicate with the inside ,
An upper end opening edge portion (64) of the support cylinder portion (61) is disposed below the clutch cover side edge portion (64a) continuous with the inner wall of the clutch cover (40) and below the clutch cover side edge portion (64a). lubricating structure for a clutch mechanism in the power unit to the clutch mechanism side edge from the (64b), wherein formed Rukoto which are disposed is disposed in the clutch mechanism (26) side. An internal combustion engine (E) having a crankcase (12) that rotatably supports the crankshaft (11), and an input shaft (29) extending in parallel with the crankshaft (11), the crankcase (12) The transmission (25) housed in the input shaft (outside of the crankcase (12) so as to cut off and connect power transmission between the crankshaft (11) and the input shaft (29). 29) a clutch mechanism (26) arranged coaxially, a clutch cover (40) covering the clutch mechanism (26) and coupled to the crankcase (12), and rotating to the clutch cover (40) The release rod (55) that is freely supported, and the axial movement of the input shaft (29) according to the rotation of the release rod (55) move the clutch mechanism (26). The vehicle power unit and a composed clutch release mechanism (57) at lifter piece for switching contact (56),
A bottomed support tube portion (61) for rotatably inserting a lower portion of the release rod (55) extending in the vertical direction into an inner wall of the clutch cover (40) is disposed between the release rod (55). An oil flow passage (62) is formed and integrally provided so as to open an upper end of the oil flow passage (62), and the oil flows from the oil flow passage (62) to the clutch mechanism (26) side. A fitting hole (63) for fitting the end of the lifter piece (56) on the release rod (55) side so as to be movable in the axial direction is formed in the shape of the support cylinder (61). Provided in the lower part of the support cylinder part (61) so as to communicate with the inside,
The inner wall of the clutch cover (40) is formed with a recess (65) that accommodates a part of the outer periphery of the release rod (55) above the support cylinder (61), and the recess (65). The projecting wall portion (66) connected to one side surface (65a) facing the side facing the rotational direction (67) of the input shaft (29) when the vehicle moves forward among the both side surfaces (65a, 65b) of the clutch lubricating structure for a clutch mechanism in a vehicle dual power unit you characterized in that it is provided integrally inner wall so as to project from the said clutch cover (40) of the cover (40). The clutch cover (40) is formed in a hook shape so as to cover the clutch mechanism (26) from the outside in the axial direction, and the clutch mechanism protection unit extends at least upward. An extension hole (40b) extending outward from (40a) is integrally formed, and an insertion hole (68) connected to the recess (65) is formed so as to insert the release rod (55). The lubricating structure for a clutch mechanism in a power unit for a vehicle according to claim 2 , wherein a projecting portion (69) is integrally formed on an upper portion of the extending portion (40b). An internal combustion engine (E) having a crankcase (12) that rotatably supports the crankshaft (11), and an input shaft (29) extending in parallel with the crankshaft (11), the crankcase (12) The transmission (25) housed in the input shaft (outside of the crankcase (12) so as to cut off and connect power transmission between the crankshaft (11) and the input shaft (29). 29) a clutch mechanism (26) arranged coaxially, a clutch cover (40) covering the clutch mechanism (26) and coupled to the crankcase (12), and rotating to the clutch cover (40) The release rod (55) that is freely supported, and the axial movement of the input shaft (29) according to the rotation of the release rod (55) move the clutch mechanism (26). The vehicle power unit and a composed clutch release mechanism (57) at lifter piece for switching contact (56),
A bottomed support tube portion (61) for rotatably inserting a lower portion of the release rod (55) extending in the vertical direction into an inner wall of the clutch cover (40) is disposed between the release rod (55). An oil flow passage (62) is formed and integrally provided so as to open an upper end of the oil flow passage (62), and the oil flows from the oil flow passage (62) to the clutch mechanism (26) side. A fitting hole (63) for fitting the end of the lifter piece (56) on the release rod (55) side so as to be movable in the axial direction is formed in the shape of the support cylinder (61). Provided in the lower part of the support cylinder part (61) so as to communicate with the inside,
A locking recess (71) for engaging the lifter piece (56) with the release rod (55), and an axially extending end of the release rod (55) and a lower end opened to the locking recess (71). And a communication hole (73) extending in the radial direction of the release rod (55) so as to extend between the outer periphery of the release rod (55) and the shaft hole (72). lubricating structure for a clutch mechanism in a vehicle dual power unit shall be the features. The communication hole (73) passes through the outer end of the communication hole (73) through the oil flow passage (62), and is below the upper end opening edge (64) of the support cylinder part (61). The lubricating structure for a clutch mechanism in a power unit for a vehicle according to claim 4 , wherein the lubricating structure is provided on a release rod (55). A bearing (74) disposed between the upper end opening edge (64) of the support cylinder (61) and the fitting hole (63) is provided between the release rod (55) and the support cylinder (61). The lubricating structure for a clutch mechanism in a power unit for a vehicle according to claim 5 , wherein the lubricating hole is disposed and the communication hole (73) is disposed above the bearing (74). An internal combustion engine (E) having a crankcase (12) that rotatably supports the crankshaft (11), and an input shaft (29) extending in parallel with the crankshaft (11), the crankcase (12) The transmission (25) housed in the input shaft (outside of the crankcase (12) so as to cut off and connect power transmission between the crankshaft (11) and the input shaft (29). 29) a clutch mechanism (26) arranged coaxially, a clutch cover (40) covering the clutch mechanism (26) and coupled to the crankcase (12), and rotating to the clutch cover (40) The release rod (55) that is freely supported, and the axial movement of the input shaft (29) according to the rotation of the release rod (55) move the clutch mechanism (26). The vehicle power unit and a composed clutch release mechanism (57) at lifter piece for switching contact (56),
A bottomed support tube portion (61) for rotatably inserting a lower portion of the release rod (55) extending in the vertical direction into an inner wall of the clutch cover (40) is disposed between the release rod (55). An oil flow passage (62) is formed and integrally provided so as to open an upper end of the oil flow passage (62), and the oil flows from the oil flow passage (62) to the clutch mechanism (26) side. A fitting hole (63) for fitting the end of the lifter piece (56) on the release rod (55) side so as to be movable in the axial direction is formed in the shape of the support cylinder (61). Provided in the lower part of the support cylinder part (61) so as to communicate with the inside,
The lifter piece (56) has an end wall portion (56a) at one end portion on the release rod (55) side and a clutch mechanism oil passage (77) inside, and is formed into a cylindrical shape. (56b), a disc-shaped engaging portion (56c) that is rotatably engaged with the release rod (55), and a smaller diameter than the cylindrical portion (56b), the engaging portion (56c) and the end A solid rod-like neck portion (56d) connecting between the central portions of the wall portion (56a) is integrally formed, and the end wall portion (56a) is connected to the clutch mechanism oil passage (77) side. lubricating structure for a clutch mechanism in a vehicle dual power unit you wherein a plurality of oil inflow hole inclined to be close to each other (78) is provided toward the. The clutch mechanism (26) is linked to and connected to a plurality of drive friction plates (49) engaged with a clutch outer (47) to which power is transmitted from the crankshaft (11) side and the input shaft (29). A plurality of driven friction plates (50) which are engaged with a clutch inner (48) and arranged between the plurality of drive friction plates (49), and the drive friction plates (49) and 49 in the axial direction An oil ejection hole (79) extending in the radial direction of the cylindrical portion (56b) is provided in the cylindrical portion (56b) of the lifter piece (56) at a portion corresponding to the driven friction plate (50). A lubricating structure for a clutch mechanism in a vehicle power unit according to claim 7 . The input shaft (29) is formed in a cylindrical shape so as to coaxially have a transmission oil passage (31) for supplying oil to the transmission (25), and the cylindrical portion of the lifter piece (56). (56b) is formed in a bottomed cylindrical shape having the end wall portion (56a) at one end thereof, and the other end portion of the cylindrical portion (56b) opposite to the end wall portion (56a) is formed. The clutch mechanism oil passage (77) is formed between the input shaft (29) and the end wall portion (56a), and the clutch mechanism oil passage (77) is connected to the transmission oil. The lubricating structure for a clutch mechanism in a power unit for a vehicle according to claim 8 , wherein a partition cap (80) isolated from the passage (31) is attached to the other end of the cylindrical portion (56b). . An upper end opening edge portion (64) of the support cylinder portion (61) is disposed below the clutch cover side edge portion (64a) continuous with the inner wall of the clutch cover (40) and below the clutch cover side edge portion (64a). clutch mechanism in a power unit for a vehicle according to any one of claims 2-9, which is arranged, characterized in that consists of the clutch mechanism side edges and (64b) disposed in the clutch mechanism (26) side Lubrication structure. The release rod (55) is formed to have a central small diameter portion (55a) having a smaller diameter than both ends in the axial direction, and the longitudinal intermediate portion of the central small diameter portion (55a) is the support. The lubricating structure for a clutch mechanism in a vehicle power unit according to any one of claims 1 to 10, wherein the lubricating structure is disposed at a position corresponding to an upper end opening edge (64) of the cylindrical portion (61).   An annular seal member (82) surrounding the lifter piece (56) between the end of the lifter piece (56) on the release rod (55) side and the lower portion of the support cylinder (61). The lubricating structure for a clutch mechanism in a power unit for a vehicle according to any one of claims 1 to 11, wherein

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