JP3685810B2 - Lubrication structure in engine output take-out device - Google Patents

Description

[0001]
[Industrial application fields]
  The present invention relates to a lubrication structure for lubricating a meshing engagement portion in an engine output extraction device in which an input shaft of an operating device driven by an engine is meshed and engaged with an output shaft that outputs engine power.
[0002]
[Prior art]
  Conventionally, in such an apparatus, the meshing engagement portion of the output shaft and the input shaft is disposed at a portion where the lubricating oil is accumulated, or is housed and disposed in a separate chamber specially formed so as to be filled with grease. It is common.
[0003]
[Problems to be solved by the invention]
  However, as in the conventional case, if the meshing engagement portion is disposed at the portion where the lubricating oil is accumulated, the arrangement of the operating device is restricted, and in the case where a separate chamber filled with grease is provided, the grease is not provided. Is not only required, but also increases the number of parts and the structure.
[0004]
  The present invention has been made in view of such circumstances, and it is possible to obtain sufficient lubrication without using grease or the like even if the meshing engagement portion is disposed in a portion where lubrication by the lubricating oil cannot be expected. It is an object of the present invention to provide a lubricating structure in an engine output take-out device that increases the degree of freedom.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the invention according to claim 1, The axis is horizontalCrankshaftAnd itsInput shaft of operating equipment driven by engineCan be rotated in conjunction with each other by meshing the screw gears formed on the shafts.In the engine output take-out device, the input shaftThe screw gear of the input shaft is on the upper side when viewed from the meshing part of both screw gears. The rank shaft screw gear is on the lower side and the input shaftAxisButObliquely crosses the cylinder axis of the engineComposite plating in which fluorine resin particles having a self-lubricating property and a particle size of 1 μm or less are dispersed in nickel phosphorous plating only on the surface of the screw gear of the input shaft of both screw gears A treatment film is formed, and the cylinder block of the engine is arranged on one side of the vertical plane passing through the axis of the crankshaft, and the operating equipment is arranged on the other side.It is characterized by that.
[0006]
  According to the invention described in claim 2, in addition to the configuration of the invention described in claim 1, the double screw gear is disposed in a crankcase of a two-cycle engine, and the operating device is an oil pump. The composite plating film is formed on the surface of the input shaft of the oil pump.
[0007]
【Example】
  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0008]
  1 to 14 show an embodiment of the present invention. FIG. 1 is a side view of a scooter type motorcycle, FIG. 2 is a plan view taken along the arrow 2 in FIG. 1, and FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 3, FIG. 5 is a partially cutaway longitudinal sectional view taken along line 5-5 in FIG. 4, and FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 7 is a sectional view taken along line 7-7 in FIG. 4, FIG. 8 is a sectional view taken along line 8-8 in FIG. 7, FIG. 9 is a sectional view taken along line 9-9 in FIG. FIG. 11 is a sectional view taken along line 11-11 of FIG. 7, FIG. 12 is an enlarged sectional view taken along line 12-12 of FIG. 3, FIG. 13 is an enlarged sectional view taken along line 13-13 of FIG. It is sectional drawing which expands and shows the input shaft of a pump.
[0009]
  1 and 2, a vehicle body frame F of a scooter-type motorcycle V includes a head pipe 1 that supports a front fork 7 that suspends a front wheel Wf so as to be steerable, and a down tube that extends downward from the head pipe 1. 2 and a rear frame 3 and the like that are connected to the lower end portion of the down tube 2 and extend rearward. The rear frame 3 is connected to the lower end of the down tube 2 and has a pair of front frame portions 3a, 3a extending substantially horizontally toward the rear side, and rear ends of the front frame portions 3a, 3a. A pair of intermediate frame portions 3b, 3b extending upward in the rear and a rear frame portion 3c for connecting the rear ends of both intermediate frame portions 3b, 3b to each other and formed in a substantially elliptical shape in plan view It is.
[0010]
  The vehicle body frame F is covered with a vehicle body cover C. The vehicle body cover C is joined to the front cover 11 and the front cover 11 that cover the front part of the head pipe 1 and the upper part of the front wheel Wf, and the legs of the driver. Jointed to the front leg shield 12, the front cover 11, and the leg shield 12 to cover both sides of the front vehicle body, the left and right pair of front side covers 13, 13 and the leg shield 12 are joined to support the driver's feet. The floor board 14, the front side covers 13, 13 and the floor board 14 are joined to the left and right rear lower covers 16, 16 and both the lower rear covers 16, 16 and the floor board. 14 and the like, and a rear upper cover 17 joined to the rear portion of the rear upper cover 17. Rear fender 18 covering the upper portion of the wheel Wr is attached. The upper surface of the rear upper cover 17 is opened, and the upper surface opening is covered with a seat 20 on which the driver sits. Thus, the seat 20 is hinged to the upper end of the rear upper cover 17 so as to be freely opened and closed, and the luggage box 21 having the upper end opened is accommodated and disposed in the upper portion of the rear upper cover 17. An article storage chamber 22 capable of storing a helmet or the like is formed below the seat 20, and the article storage chamber 22 is opened and closed by the seat 20.
[0011]
  Referring also to FIG. 3, the rear wheel Wr as a drive wheel is pivotally supported on the rear portion of the power unit P on the body frame F. The power unit P includes the two-cycle forced air cooling engine E, the engine And a continuously variable transmission M as a transmission mechanism for transmitting the output of E to the rear wheel Wr. Thus, the front portion of the power unit P swings to both intermediate frame portions 3b and 3b of the rear frame 3 in the vehicle body frame F via a link mechanism 24 having a support shaft 23 parallel to the rotational axis of the rear wheel Wr. A rear cushion 25 is interposed between the rear portion of the power unit P and the rear frame 3.
[0012]
  4 and 5, the cylinder head 26 of the two-cycle forced air cooling engine E is disposed between the intermediate frame portions 3b and 3b of the rear frame 3, and the cylinder head 26 has a substantially horizontal axis. The front end of the cylinder block 27 is coupled, and the crankcase 28 is coupled to the rear end of the cylinder block 27. A piston 30 is slidably fitted into the cylinder bore 29 of the cylinder block 27, and the piston 30 is connected to a crankshaft 32 as an output shaft via a connecting rod 31.
[0013]
  A cooling fan 34 is connected to one end of the crankshaft 32 protruding from the crankcase 28 via a generator 33. A shroud 36 that forms a scroll passage 35 around the cooling fan 34 includes a cooling fan 34, The cylinder head 26 and the cylinder block 27 are covered.
[0014]
  Referring also to FIG. 6, the shroud 36 includes a first member 37 as a head corresponding member that covers at least the cylinder head 26 (in this embodiment, the cylinder head 26 and the cylinder block 27) from the front side, and the remaining portion. The second member 38 to be covered is joined. Thus, the first member 37 has a plurality of tightening directions along the axis of the cylinder block 27 with the rubber 40 interposed between the tips of the fins 39 provided on the cylinder head 26. The mounting bolts 41 are fastened to the cylinder head 26. That is, the cylinder head 26 is provided with a plurality of mounting bosses 42 that are in contact with the inner surface of the rubber 40 in parallel with the axis of the cylinder block 27 and are in contact with the rubber 40 and the outer surface of the rubber 40. The first member 37 is provided with insertion holes 43 corresponding to the mounting bosses 42. Thus, one end of the mounting boss 42 is brought into contact with the mounting boss 42 and the other end is inserted into the insertion hole 43. The other end of the mounting bolt 41 penetrates the cylindrical mounting rubber 44 engaged with the outer surface of the first member 37. Screwed to each mounting boss 42.
[0015]
  The first member 37 is provided with a hole 46 for inserting a spark plug 45 screwed into the cylinder head 26. The hole 46 has an outer periphery of a plug seal 47 in close contact with the outer periphery of the spark plug 45. Are engaged. A cap 48 that covers the outer end of the spark plug 45 is detachably engaged with the plug seal 47 in a resilient manner.
[0016]
  As shown in FIGS. 1 and 3, a maintenance lid 49 is attached to the floor board 14 of the vehicle body cover C so as to be openable and closable on the front extension line of the cylinder head 26. A fuel tank 50 is fixedly disposed below the floor board 14 so that refueling is possible when opened.
[0017]
  The first member 37 and the second member 38 are engaged with each other so that the first member 37 and the second member 38 can be engaged and disengaged according to the moving operation of the first member 37 along the axis of the cylinder head 26.
[0018]
  Referring also to FIG. 7, the second member 38 of the shroud 36 has an annular partition wall 52 that protrudes inward, that is, toward the cooling fan 34 substantially corresponding to the rotation locus 51 of the outermost edge of the cooling fan 34. A scroll passage 35 is formed between the partition wall 52 and the outer peripheral wall of the second member 38. Thus, the scroll passage 35 gradually increases its flow area along the rotation direction 53 of the cooling fan 34, and the outer peripheral wall of the second member 38 is a portion corresponding to the partition wall 52. In order to gradually move away from the partition wall 52 as it goes to the downstream side along the line. In addition, a portion corresponding to the scroll passage 35 of the second member 38 is provided with a bulging portion 38 a bulging outward in the axial direction of the cooling fan 34, and the bulging portion 38 a extends along the rotation direction 53. The bulging amount is formed so as to gradually increase toward the downstream side. That is, the first position P on the upstream side in the rotation direction 53 in the scroll passage 35.₁As shown in FIG.₁The first position P₁The second position P on the downstream side of₂Then, as shown in FIG.₁Larger bulge amount L₂The bulging portion 38a is formed at the second position P₂The third position P on the downstream side of_ThreeThen, as shown in FIG.₂Larger bulge amount L_ThreeThe bulging portion 38a is formed at the third position P._Three4th position P downstream of_FourThen, as shown in FIG._ThreeLarger bulge amount L_FourThus, the bulging portion 38a is formed.
[0019]
  The second member 38 is provided with a circular hole 55 facing the cooling fan 34 so as to be coaxial with the crankshaft 32, and has a plurality of suction ports 56 that communicate with the circular hole 55 between the partition portions 57. A cover 58 is attached to the second member 38, and a sound absorbing material 59 is filled between the second member 38 and the cover 58. Thus, a large number of holes 60 are formed in a portion corresponding to the sound absorbing material 59 of the second member 38, and noise generated in the shroud 38 is absorbed by the sound absorbing material 59 through the holes 60. Is done.
[0020]
  In FIG. 4 again, the crankcase 28 is integrally provided with a case portion 61 extending to one side of the rear wheel Wr, and a case member 63 coupled to the case portion 61 via a gasket 62; Thus, a transmission case 64 is configured. Thus, the continuously variable transmission M is provided between the other end of the crankshaft 32 protruding from the crankcase 28 and the axle 65 of the rear wheel Wr rotatably supported on the rear portion of the transmission case 64.
[0021]
  Since the continuously variable transmission M is well known in the art, the configuration thereof will be briefly described. The crankshaft 32 includes a fixed pulley half 66 fixed to the end of the crankshaft 32, and a crankshaft. A drive-side transmission pulley 68 comprising a movable pulley half 67 that is slidably mounted on the shaft 32 is provided. A V-shaped annular groove 69 is formed between the fixed and movable pulley halves 66 and 67, and an endless V-belt 70 is inserted into the annular groove 69. A ramp plate 71 is fixed to the crankshaft 32 on the back surface of the movable pulley half 67, and a plurality of weight rollers 72 are accommodated in a floating state between the ramp plate 71 and the movable pulley half 67. . Thus, when the rotation speed increases when the crankshaft 32 rotates, the weight roller 72 receiving the centrifugal force moves outward in the radial direction, moving the movable pulley half 67 in a direction approaching the fixed pulley half 66, As a result, the contact radius of the V-belt 71 to both pulley halves 66 and 67 can be increased.
[0022]
  On the other hand, a driven shaft 73 parallel to the crankshaft 32 is rotatably supported by a transmission case 64, and this driven shaft 73 is connected to the axle 65 of the rear wheel Wr via a reduction gear train 74.
[0023]
  The driven shaft 73 is connected to a driven side transmission pulley 76 coaxial with the driven shaft 73 via a conventionally known centrifugal clutch 75. The driven side transmission pulley 76 is paired with the driving side transmission pulley 68, and the V-belt 71 is wound around the driving side transmission pulley 68.
[0024]
  Referring also to FIG. 12, a vaporizer 80 and an air cleaner 81 connected to the vaporizer 80 are disposed above the transmission case 64. The air cleaner 81 is configured such that a filter medium 84 is sandwiched between a first case member 82 and a second case member 83 coupled to the second case member 82, and the first case member 82 and the filter medium 84. An unpurified chamber 85 is formed therebetween, and a purified chamber 86 is formed between the second case member 84 and the filter medium 84. A suction pipe 87 that opens downward through the unpurified chamber 85 is connected to the first case member 82, and a connection pipe 88 that is connected to the vaporizer 80 is integrally provided in the second case member 83.
[0025]
  The first case member 82 of the air cleaner 81 is provided with a cover portion 89 that covers the outer side of the vaporizer 80 so as to extend forward and integrally therewith. The cover portion 89 is used to adjust the vaporizer 80. A working hole 90 is provided in correspondence with the vaporizer 80.
[0026]
  On the other hand, in the first member 37 of the shroud 36, at the position opposite to the suction port 56 with respect to the cylinder block 27, an air exhaust port (for exhausting the air that has flowed through the shroud 36 and raised its temperature outside) (Not shown) and an exhaust port 90 for guiding the exhaust air for heat insulation to the vaporizer 80. A rubber connection pipe 91 is connected to the exhaust port 90, and the connection pipe 91 is further connected. One end of the air guide duct 92 is connected to the sway.
[0027]
  The air guide duct 92 is formed by joining a pair of duct halves 93 and 94 to each other. The air guide duct 92 is accommodated in a concave portion 95 provided in the case member 63 of the transmission case 64 and is substantially on the outer surface of the case member 63. It extends to the vaporizer 80 side so as to be flush with each other. In addition, the other end portion of the air guide duct 92 is fastened to the cover portion 89 by the screw member 96. Further, a cover portion 93 a that covers the upper front side of the vaporizer 80 is provided integrally with the duct half body 93 at the other end of the air guide duct 92. In addition, the air guide duct 92 is also provided with an engaging portion (not shown) for engaging piping related to the vaporizer 80.
[0028]
  As shown in FIG. 5, an intake port 98 in which a reed valve 97 is disposed is provided at the upper part of the crankcase 28, and the carburetor 80 communicates with the intake port 98 through an intake pipe 99. Moreover, the crankshaft 32HorizontalIn the plane orthogonal to the axis, the angle α formed between the axis of the cylinder block 27 and the suction port 98 is set to an obtuse angle, and the support shaft 23 of the link mechanism 24 that supports the power unit P to the vehicle body frame F includes the cylinder block 27 and It is arranged at a position sandwiched by the suction port 98.
[0029]
  In FIG. 13, a recessed portion 101 is provided on the upper surface of the crankcase 28 at a position below the intake pipe 99, and an input shaft 104 provided with a screw gear 103 that meshes with a screw gear 102 provided on the crankshaft 32. An oil pump 105 as an operating device having the above is attached to the crankcase 28 so that most of the oil pump 105 is accommodated in the recess 101.Thus, the cylinder block 27 is disposed on the front side of the vertical plane passing through the axis of the crankshaft 32, and the oil pump 105 is disposed on the rear side thereof.
[0030]
  Incidentally, as shown in FIG. 13, the screw gear 103 of the input shaft 104 meshes with the screw gear 102 of the crankshaft 32 on the upper side of the crankshaft 32 in the crankcase 28.(That is, the screw gear 103 of the input shaft 104 is arranged on the upper side and the screw gear 102 of the crankshaft 32 is arranged on the lower side when viewed from the meshing part of both the screw gears 103, 102).The meshing engagement portions of the screw gears 102 and 103 are lubricated by the lubricating oil in the transmission case 64.EnoughI can't expect it. there,Disadvantageous for its lubricationAs shown in FIG. 14, the entire surface of the input shaft 104 having the screw gear 103 is self-lubricating.FluorBase resinTheThe film 106 is formed by a plating process using the contained material.
[0031]
  Here, the input shaft 104 is made of SCM415H (JIS), plating treatment conditions and heat treatment when carburizing treatment is performed such that the carburization depth is 0.2 to 0.4 mm and the surface hardness is HRA 78 to 83. The conditions are as follows, for example.
[Plating treatment]
  Plating film thickness: 20 ± 4μm
  Plating film composition
              Ni: 88.2-89.3 wt%
              P: 9.8 to 9.9 wt%
        Tetrafluoroethylene resin: 0.8 to 2.0 wt% (3.0 to 7.0 vol%)
  Tetrafluoroethylene resin particle size: 1 μm or less
  Plating film density: 7Z3 to 7.6 g / cm^Three
〔Heat treatment〕
    Processing temperature: 300 ± 10 ° C
    Processing time: 60 minutes or more
  Next, the operation of this embodiment will be described. When the engine E is operated, the cooling fan 34 connected to the crankshaft 32 rotates, and the air sucked from the suction port 56 passes through the scroll passage 35 from the cooling fan 34. Then, the ink is discharged toward the cylinder head 26 and the cylinder block 27 side. Here, the scroll passage 35 gradually increases its circulation area along the rotation direction 53 of the cooling fan 34. Thus, the outer peripheral portion of the second member 38 in the shroud 36 gradually expands outward in the radial direction of the cooling fan 34 as it goes downstream along the rotational direction 53, and corresponds to the scroll passage 35 of the second member 38. By providing a bulging portion 38 a that bulges outward in the axial direction of the cooling fan 34, the flow area of the scroll passage 35 along the rotational direction 53 is increased. Therefore, it is possible to change the circulation area of the stroke passage 35 ideally along the rotation direction 53 and minimize the expansion of the second member 38 outward along the radial direction of the cooling fan 34. Therefore, even if the distance between the cooling fan 34 and the rear wheel Wr is relatively small, the maintainability of the drive wheel Wr can be maintained, thereby contributing to the downsizing of the motorcycle V. it can.
[0032]
  The air from the scroll passage 35 is heated by cooling the cylinder head 26 and the cylinder block 27, and a part of the air is discharged to the outside, and the remaining heated air is guided from the exhaust port 90 through the connection pipe 91. It is discharged toward the vaporizer 80 by the wind duct 92. As a result, the vaporizer 80 is kept warm. In addition, the air cleaner 81 is integrally provided with a cover portion 89 that covers the outer side of the vaporizer 80, and the air guide duct 92 is connected to the cover portion 89. Therefore, external environmental factors such as rainfall, splashes, and traveling wind Thus, the air duct 92 and the cover part 89 of the air cleaner 81 can work together to improve the durability of the vaporizer 80 against the external environmental factors.
[0033]
  Further, since the exhaust air from the exhaust port 90 is guided to the vaporizer 80 by the air guide duct 92, it is not necessary to dispose the vaporizer 80 close to the shroud 36, and it is possible to eliminate restrictions on the arrangement of the vaporizer 80. Become.
[0034]
  Such a wind guide duct 92 is accommodated in the concave portion 95 of the case member 63 in the transmission case 64 and is disposed so as to be substantially flush with the outer surface of the case member 63, so that the upper side of the transmission case 64 is provided. The air cleaner 81, the air guide duct 92, and the transmission case 64 that are arranged on the outside can be provided with a clean and integrated appearance.
[0035]
  The shroud 36 is formed by joining a first member 37 that covers the cylinder head 26 and the cylinder block 27 from the front side, and a second member 38 that covers the remaining portion, and the first member 37 has a plurality of attachments. It is fastened to the cylinder head 26 by bolts 41. Accordingly, the distance between the cylinder head 26 and the shroud 36 can be set strictly, and the shroud 36 has a flow resistance larger than the flow resistance when the cooling air flows between the fins 39 of the cylinder head 26. In addition, it is easy to narrow the interval between the cylinder heads 26, and it is possible to contribute to the improvement of the cooling efficiency by the cooling air. In particular, when the rubber 40 is sandwiched between the shroud 36 and the fins 39 as in this embodiment, the cooling air can be reliably circulated between the fins 39. Efficiency can be improved reliably. The rubber 40 also exhibits an action of suppressing fin noise of the cylinder head 26. Since the shroud 36 is attached to the cylinder head 26 with the mounting bolts 41 through the mounting rubber 44, noise due to vibration is reduced. It becomes possible.
[0036]
  In addition, the first member 37 that covers the cylinder head 26 and the cylinder block 27 from the front side is fastened to the cylinder head 26 by the mounting bolts 41 with the tightening direction along the axis of the cylinder block 27, whereby the cylinder block 27 It becomes easy to perform the maintenance work of the engine E by removing the first member 37 of the shroud 36 in a state in which the maintenance lid 49 on the extension of the axis is opened.
[0037]
  By the way, the suction port 98 of the engine E is provided at the upper part of the crankcase 28 so as to form an obtuse angle with the axis of the cylinder block 27 in a plane orthogonal to the axis of the crankshaft 32. It is possible to efficiently suck the air-fuel mixture into the crankcase 28 from the intake port 98 when moving to the position. Further, since the support shaft 23 of the link mechanism 24 that supports the power unit P to the vehicle body frame F is disposed at a position sandwiched between the cylinder block 27 and the suction port 98, the length from the grounding point of the rear wheel Wr to the support shaft 23 is set. Can be set relatively long, the vertical swing angle of the power unit P can be kept relatively small, and the maximum height position of the engine E can be kept relatively low, so that the intake system of the carburetor 80, the air cleaner 81, etc. It is possible to increase the degree of freedom in the arrangement of the articles and contribute to an increase in the volume of the article storage chamber 22. In addition, since the oil pump 105 is disposed so that most of the oil pump 105 is accommodated in the recess 101 provided in the crankcase 28 below the intake pipe 99, the intake pipe 99 is connected to the intake port 98 when the intake pipe 99 is connected. The oil pump 105 does not impose restrictions on the arrangement of 99, and the degree of freedom in arrangement of the intake system increases.
[0038]
  Further, since the coating 106 is formed on the input shaft 104 of the oil pump 105 by plating with a material having self-lubricating properties such as a material containing fluorine resin, the screw gear 103 of the input shaft 104 and the crankshaft 32 The meshing engagement portion with the screw gear 102 is lubricated by the lubricating oil in the transmission case 64.EnoughEven if the crankcase 28 cannot be expected, sufficient lubrication can be obtained. Therefore, the degree of freedom in arrangement of the meshing engagement portion, that is, the oil pump 105 can be increased.
[0039]
  Although the embodiments of the present invention have been described in detail 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.
[0040]
  For example, the film 106 may be formed only on the portion of the screw gear 103 without forming the film 106 over almost the entire surface of the input shaft 104.No. Further, the input shaft 104 may be formed by coupling the screw gear 103 and other parts. In that case, it is needless to say that the coating 106 may be formed only on the screw gear 103. Then, processing becomes easier as compared with the case where the film 106 is formed on the entire input shaft 104.
[0041]
【The invention's effect】
  As aboveBookAccording to the invention, the crankshaft of the engineAnd itsInput shaft of operating equipment driven by engineCan be rotated in conjunction with each other by meshing the screw gears formed on the shafts.In the engine output extraction device,A composite plating film in which self-lubricating fluorine resin particles are dispersed in nickel phosphorus plating is formed on the surface of the screw gear of the input shaft of both screw gears.So lubrication with lubricating oilEnoughEven if the meshing engagement portion is arranged at a position where it cannot be expected, sufficient lubrication can be obtained, grease and the like can be dispensed with, and the degree of freedom in arrangement of the operating device can be increased. Fluorine resin during phosphor platinggrainBy forming a composite plating treatment film in which the fluorine resin is dispersed, the fluororesin is difficult to peel off, and the durability of the film can be effectively increased, and the good lubricating effect of the fluororesin is exhibited over a long period of time. The
[0042]
  AlsoThe input shaft is arranged such that the screw gear of the input shaft is on the upper side and the screw gear of the crank shaft is on the lower side when viewed from the meshing part of both screw gears,The composite plating film is a screw gear formed on the crankshaft and the input shaft.The upper (ie, input shaft) screw gear is disadvantageous for lubricationBecause it is formed only on the surface ofDispersion of plating film thickness when plating on both screw gears while reducing the cost by eliminating the need for plating treatment on the lower (ie, crankshaft) screw gear, which is relatively advantageous for lubrication with lubricating oil The backlash of the meshing part of the double screw gear can be set as small as possible. And thatSince the composite plating film is softer than the gear base material, as a result, the backlash of the meshing portion is reduced, and the impact of the meshing portion due to engine rotation fluctuation is reduced, so that the wear of the composite plating coating film is effective. In addition, although the screw gear has a sliding mesh structure with a large slip rate, a composite plating treatment film is formed on only one of the meshed portions as described above, so Since the so-called stroking phenomenon in which the plating treatment films are directly rubbed to cause baking can be effectively prevented, appropriate backlash can be maintained over a long period of time. As a result of the above, it can greatly contribute to the improvement of the durability of the composite plating treatment film, and not only can the friction of the meshing portions of the screw gears be reduced over a long period of time, but also ensure the lubricity of the meshing portions. Effective for preventing tooth surface wear.
[0043]
  The fluorine resin particles in the composite plating film areBy making the particle size particularly 1 μm or less, the backlash can be set smaller by reducing the thickness of the coating as much as possible while reducing the aggression to the non-plated mating member (crankshaft screw gear). Combined with the effect of reducing wear, it can greatly contribute to the improvement of life.
[0044]
  Further, since the axis of the input shaft obliquely intersects the cylinder axis of the engine, the crankshaft (and hence the screw gear on the crankshaft side) is reciprocated in the cylinder axis direction of the piston that responds to the engine's explosion load. ) Can be effectively avoided even if the minute displacement is repeated in small increments in the direction along the cylinder axis, and the influence of the minute displacement on the meshing part of both screw gears (for example, the tooth surfaces are strongly pressed together) Both screw gears are always maintained in a smooth meshing state, and therefore, the various effects obtained by forming the composite plating film on only one of the meshing portions described above can be achieved more reliably, and the durability of the film can be further improved. Figured.
[0045]
  Furthermore, the cylinder block of the engine is arranged on one side of the vertical plane that passes through the axis of the crankshaft, and the operating equipment is arranged on the other side, so that the operating equipment can be separated from the cylinder block as much as possible. The degree of freedom of equipment placement is increased.
[0046]
  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the double screw gear is disposed in a crankcase of a two-cycle engine, and an input of an oil pump as the operating device is provided. Since the composite plating film is formed on the surface of the shaft, it is possible to dispose the meshing engagement portion in the crankcase where lubrication with lubricating oil cannot be expected. In addition, since the composite plating film can be formed on the input shaft of a relatively small oil pump, it is easy to form the plating film, and the man-hour of the plating film is reduced for a relatively large output shaft. Can be achieved.
[Brief description of the drawings]
FIG. 1 is a side view of a scooter type motorcycle.
FIG. 2 is a plan view taken along arrow 2 in FIG.
FIG. 3 is an enlarged view of a main part of FIG. 1;
4 is an enlarged cross-sectional view taken along line 4-4 of FIG.
5 is a partially cutaway longitudinal sectional view taken along line 5-5 of FIG.
6 is an enlarged sectional view taken along line 6-6 of FIG.
7 is a view taken in the direction of arrows 7-7 in FIG. 4;
8 is a cross-sectional view taken along line 8-8 in FIG.
9 is a cross-sectional view taken along line 9-9 of FIG.
10 is a cross-sectional view taken along line 10-10 of FIG.
11 is a cross-sectional view taken along a line 11-11 in FIG. 7;
12 is an enlarged sectional view taken along line 12-12 in FIG. 3;
13 is an enlarged cross-sectional view taken along line 13-13 of FIG.
FIG. 14 is an enlarged sectional view showing an input shaft of the oil pump.
[Explanation of symbols]
27        Cylinder block
32 Crankshaft as output shaft
102      Crankshaft screw gear
103      Thread gear of input shaft
104      Input shaft
105 Oil pump as operating equipment
106 film
E 2-cycle engine

Claims (2)

The crankshaft (32) of the engine (E) whose axis is horizontal and the input shaft (104) of the operating device (105) driven by the engine (E) are connected to these shafts (32, 104). In the engine output take-out device that can rotate in conjunction with each other by the mutual engagement of the formed screw gears (102, 103) ,
As for the input shaft (104), the screw gear (103) of the input shaft (104) is on the upper side and the screw gear (102) of the crank shaft (32) is on the upper side when viewed from the meshing part of both screw gears (102, 103). as will become lower, and and the axis of the input shaft (104) is arranged so as to intersect obliquely to the cylinder axis of the engine (E),
Fluorine resin particles having self-lubricating properties and a particle size of 1 μm or less are dispersed in nickel phosphorus plating only on the surface of the screw gear (103) of the input shaft (104) of both screw gears (102, 103). A composite plating treatment film (106) is formed,
The cylinder block (27) of the engine (E) is arranged on one side of the vertical plane passing through the axis of the crankshaft (32), and the operating device (105) is arranged on the other side, respectively . Lubrication structure in engine output take-out device.   The double screw gears (102, 103) are disposed in a crankcase (28) of a two-cycle engine (E), the operating device (105) is an oil pump, and an input shaft ( 103. The lubricating structure for an engine output take-out device according to claim 1, wherein the composite plating film (106) is formed on the surface of 103).

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