TW593877B - Air intake connection structure for forced air cooling engine - Google Patents

Abstract

The object of the present invention is to provide an air intake coupling structure for forced air cooling engine, which enhances the assembly of an air intake coupling structure of forced-air-cooling engine in which a mounting face is mounted on a cover shielding a cylinder head and defines an intake port, and an insulator is mounted on the mounting face and securely fixing an inlet pipe. The solution is that in the cover 82, openings 105 are defined for receiving and positioning the insulator 99.

Description

r593877 、; description of the present invention [Technical field to which the invention belongs] The present invention relates to a suction connection structure of a forced air-cooled engine. A cylinder head covered by a surrounding plate is provided with a mounting surface for opening the suction port. An insulation body is interposed on the mounting surface to fix the input pipe. [Prior Art] Conventionally, the above-mentioned structure has been disclosed in Japanese Unexamined Patent Publication No. 1 1-1 08 1 87 and the like. [Summary of the Invention] (Problems to be Solved by the Invention) In the above-mentioned conventional structure, there is provided an insertion hole through which the input pipe is inserted into the surrounding board. The input pipe system holds the input pipe and the insulator while being fastened and inserted into the pipe. The flange of the input pipe and the bolt of the insulator are fastened to the mounting surface of the cylinder head. For this reason, when a bolt is inserted through the flange and the insulator, the screw holes on the mounting surface side are covered by the flange and the insulator, and it is difficult to say that the assembly is excellent. The present invention has been made in view of the above circumstances, and an object thereof is to provide a suction connection structure of a forced air-cooled engine capable of improving assemblability. (Means for Solving the Problem) In order to achieve the above-mentioned object, the invention in the first scope of the patent application is provided with a mounting surface on the cylinder head covered by the enclosure board to open the air inlet opening. In the suction connection structure of the forced air-cooled engine that faces the input pipe, the surrounding plate is provided with an opening that fits and positions the insulator. 5 312 / Invention Specification (Supplement) / 92-06 / 92107264 593877 According to the constitution of the first invention of the above-mentioned application patent range, the insulator is positioned and held on the surrounding board by fitting into the opening, and the insulator exerts The function of guiding the bolts screwed to the screw holes provided on the mounting surface of the cylinder head can be easily screwed and tightened to the screw holes, thereby improving the assemblability. In addition, the invention in the second scope of the patent application is a constitution in which the invention in the first scope of the patent application is added, and is characterized in that a part of the inner side surface of the opening portion provided on the enclosure board made of synthetic resin and An air outlet is formed between the side surfaces of the insulator. According to the structure described above, the warm air discharged from the air outlet is used to warm the input pipe, which can improve the performance of warming up. In addition, a mold for forming an opening portion is formed when the enclosure is formed. In some cases, a part corresponding to the above-mentioned air outlet is set to be relatively large so as to increase the strength, so that the life of the mold can be improved. In addition, the invention in the third scope of the patent application is a structure in which the invention in the second scope of the patent application is added, characterized in that the thickness T of the insulator is set to be larger than the interval between the mounting surface and the surrounding board. According to the structure as described above, the insulator is fitted into the opening portion so as to be pressed against the mounting surface, so that the insulator can be prevented from falling off the enclosure plate during assembly, and the assemblability can be further improved. [Embodiment] An embodiment of the present invention will be described below with reference to an embodiment of the present invention shown in the accompanying drawings. 1 to 17 show one embodiment of the present invention, FIG. 1 is a side view of a motorcycle-type locomotive, and FIG. 2 is a state in which a vehicle body cover and a storage box are omitted. 6 312 / Invention Specification (Supplement) / 92 -06/92107264 593877 is a perspective view of the middle portion of a motorcycle-type locomotive. FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1, and FIG. 4 is an arrow view taken along arrow 4 in FIG. 3.瓯 5 is an arrow view taken along arrow 5 in FIG. 3, FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 3, and FIG. 7 is a view when the head cover is viewed from the head side of the cylinder γ. 8 is a sectional view taken along line 8-8 in FIG. 7, FIG. 9 is an enlarged sectional view taken along line 9-9 in FIG. 6, and FIG. 10 is taken along 1 0-1 in FIG. Sectional view taken along line 0, FIG. 11 is a sectional view taken along line 1 1 -1 1 in FIG. 4, and FIG. 12 is an enlarged sectional view taken along line 12-12 in FIG. 5, FIG. 13 5 is a cross-sectional view taken along line 13-13 φ in FIG. 5, FIG. 14 is an enlarged cross-sectional view taken along line 1 4-1 4 in FIG. 2, and FIG. 15 is taken along line 14 A cross-sectional view taken along line 1 5 -1 5 is shown in FIG. 16 along 1- A cross-sectional view taken on line 16 is shown in FIG. 17, and a cross-sectional view taken along line 1 7-1 7 in FIG. 14 is shown in FIG. First, in FIGS. 1 and 2, the body frame 25 of the motorcycle-type locomotive includes: a main frame pipe 27 whose front end is fixed to the head pipe 26, and a cross pipe which is fixed to the rear end of the main frame pipe 27 at a right angle. 28, and the front ends are respectively connected to a pair of left and right rear frame tubes 29, 30 as the rear frame member that spans both ends of the tube 28. The main frame pipe 27 is integrally provided with a lower frame portion 27a that is inclined from the head pipe 26 toward the lower back and a lower frame portion 27b that extends substantially horizontally from the rear end of the lower frame frame 27a and extends rearward. In addition, a pair of left and right rear frame tubes 29, 30 are integrally provided with diagonally rising frame portions 29a, 30a extending from both ends of the above-mentioned spanning tube 28 toward the upper rear, and from the diagonally rising frame portions. 2 9 a, 3 0 a The rear frame extends approximately horizontally toward the rear, and the upper frame portions are curved in a horizontal plane so that the rear end openings face each other. 2 9b, 7 312 / Invention Specification (Supplement) / 92- 06/92107264 30b. The head pipe 26 supports a front fork 31 spanning the front wheel WF in a controllable direction, and an upper end of the front fork 31 is connected to a direction control handle 32. A front portion of the power unit P that can be swung up and down is supported by a link mechanism 33 at the front of the two rear frame tubes 29 and 30 of the vehicle body frame 25. The rear wheel WR is located on the right side of the rear portion of the power unit P The axle is supported at the rear of the power unit P. In FIGS. 3 to 6, the power unit P is a 4-stroke engine E with a forced air-cooled single-cylinder disposed in front of the rear wheels WR, and a continuously variable transmission provided between the engine E and the rear wheels WR. M is composed. The engine body 34 of the engine E includes a crank case 35, a cylinder block 36 coupled to the crank case 35, a cylinder head 37 coupled to the cylinder block 3 6 on the opposite side of the crank case 35, and a cylinder block 36. On the opposite side, the head cover 3 8 combined with the cylinder head 3 7 is disposed between the two rear frame tubes 29 and 30 of the vehicle body frame 25. The cylinder head 37 is disposed in front of the two rear frame tubes 29 and 30. · Inclined frame part · Between the lower part of 2 9 a and 30 a. The cylinder block 36 is arranged along the axis of the cylinder cavity 39 provided in the cylinder block 36, that is, the cylinder axis C is inclined slightly upward and forward along the front-rear direction of the locomotive and becomes substantially horizontal. A combustion chamber 41 is formed between the cylinder head 37 and the piston 40 which is slidably fitted in the above-mentioned cylinder cavity 39. The piston 40 is connected to a crank shaft 44 having a rotation axis parallel to the rotation axis of the rear wheel WR via a connecting rod 42 and a crank pin 43. The crankshaft 44 is constituted by a pair of box portions 3 5 a and 3 5b that include the above-mentioned cylinder axis C and a plane perpendicular to the axis of the crankshaft 44 at the same time. 8 312 / Explanation of the Invention (Supplement) / 92- 06/92107264 593877 The crank case 3 5 is rotatably supported. The first ball bearing 45 is interposed between the box member 35a at one end and the crank shaft 44 and the box member 35b at the other end and A second ball bearing 46 is interposed between the crank shafts 44. The upper side of the cylinder head 37 is provided with an intake port 47 that can communicate with the combustion chamber 41, and the lower side of the cylinder head 37 is provided with an exhaust port 48 that can communicate with the combustion chamber 41. The intake valve 49 and the exhaust valve 50 for opening and closing the intake port 47 and the exhaust port 48, respectively, are arranged in a slightly V shape on a projection view of a plane perpendicular to the rotation axis of the crank shaft 44. It is arranged on the cylinder head 37 and receives potential energy in the directions in which the intake port 47 and the exhaust port 48 are closed. The spark plug 5 1 facing the combustion chamber 41 is attached to at least one of the left and right end sides of the cylinder head 37, and in this embodiment is attached to the right side in a state facing forward in the traveling direction of the locomotive. Between the cylinder head 37 and the head cover 38, a moving valve mechanism 5 2 that opens and closes the intake valve 49 and the exhaust valve 50 is housed. The moving valve mechanism 5 2 includes: An axis parallel to the axis is rotatably supported by the cylinder head 37 and a camshaft 5 5 having both intake and exhaust cams 5 4 and 5 3; the axis is parallel to the cam shaft 55 and is supported by Supported on the suction side and exhaust side of the cylinder head 3 7 is the rocker shafts 5 6 and 5 7; the suction valve 4 9 is driven to follow the suction cam 5 4 and the suction valve 4 9 can be swingably supported on the suction side. The air-side rocker arm 5 8 of the air-side rocker shaft 5 6 and the exhaust-side rocker shaft 5 7 can be freely pivoted so as to open and close and drive the exhaust valve 5 0 following the exhaust cam 5 3. The exhaust side rocker 5 9. A passive sprocket 60 is fixed to a bridging portion of the camshaft 55. On the other hand, 9 312 / Invention Specification (Supplement) / 92-06 / 92107264 is fixedly driven at the position corresponding to the passive sprocket 60 above the outer thin side of the second ball bearing 4 6 on the crank shaft 4 4. The sprocket 6 1 'drive and driven key wheels 61 and 60 roll up a seamless cam chain 62'. The cam chain 62 series is housed so that it can pass along the cylinder block 3 6, cylinder head 3 7 and head cover 3 8 The storage room 63 formed by the ^ walks. With such a driving sprocket 61, a passive chain 60 and a cam chain 62, the cam shaft 55 is rotationally driven by a half rotation number of the crank shaft 44. A drive gear 64 is fixed to the crankshaft 44 on the outer end side of the first ball bearing 45 so as to suck the lubricant oil from the lower part of the lubricant reservoir I formed in the crank case 35 through the lubricant filter 7 9 The oil pump 66 mounted on the crank case 35 in the manner of lubricating oil is driven by the drive gear 64 described above. A part of the lubricating oil discharged from the oil pump 66 is used to lubricate the moving valve mechanism 52. The crank case 35, the cylinder block 36, the cylinder head 37, and the head cover 3 8 are provided with a guide for lubricating oil from the oil pump 66. A lubricating oil supply path 67 for the moving valve mechanism 52. Further, a lubricant supply path 67 is arranged on the cylinder head 37 at a position closer to the intake port 47 than the exhaust port 48. In this embodiment, on a projection view of a plane perpendicular to the axis of the crank shaft 44 A lubricating oil supply path 67 is arranged at a position intersecting with the air inlet _ 47. Referring to FIGS. 7 and 8, the downstream end portion of the lubricating oil supply path 67 is provided on the head cover 3 8 and the cylinder head 37 to supply lubricating oil from one end to the cylinder head 37 side. It is composed of a circulation groove 6 8 on the joint surface, and a bottomed circulation hole 6 9 ^ which communicates with the other end of the circulation groove 6 8 and is provided on the side wall of the head cover 3 8. The ejection hole communicates with the inner end portion of the circulation hole 6 9. 70, is provided on the inner surface of the side wall of the head cover 38 so as to spray the lubricant toward the moving valve mechanism 52. 10 312 / Invention Manual (Supplement) / 92-06 / 92107264 593877 In addition, the head cover 38 is provided with a bottomed detection hole 7 1 at one end which communicates with the above-mentioned circulation groove 6 8. At the same time, a detection hole 7 1 corresponding to the detection hole 7 1 is provided. A mounting hub 72 protruding from the outside of the head cover 38 toward the outside is integrally provided at the position, and a temperature detector 7 3 is mounted on the mounting hub 72 so that the detection element portion 7 3 a protrudes into the detection hole 71. That is, the temperature detector 7 3 is attached to the head cover 38 of the engine body 34 so that the detection element portion 73a faces the lubricating oil supply path 67. Note that, in FIG. 3, the outer end of the drive gear 64 is provided with a stator 74 fixed to the crank case 35 and an outer rotor 75 fixed to the crank shaft 44 so as to surround the stator 74. The motor 76 has a fan 77 fixed to the crank shaft 44 at an outer end of the motor 76. The fan 77 is constituted by a plurality of blades 77b, 77b, which are integrally provided on an outer peripheral portion of a base portion 77a of an outer rotor 75 of a generator 76 fastened by, for example, four bolts 78, 78 ... By. At least the cylinder block 36 and the cylinder head 37 in the engine body 34 are part of the crank case 35, the cylinder block 36, and the cylinder head 37 in this embodiment are covered by the surrounding plate 82, and the engine body 34 and the surrounding plate 8 are covered. The two flow paths 8 丨 are formed to circulate the air for forced air cooling discharged from the fan 77. In addition, outside the cylinder block 36 and the cylinder head 37, a plurality of cooling fins 36a ··, 37a · are protruded in order to enable effective cooling by the cooling air flowing through the flow path 8 1. The above-mentioned enclosure 82 is a combination of the upper and lower upper and lower cover members 83 and 84 and a part of the crank case 35 which are coupled to each other so as to cover the cylinder block 36 and the cylinder head 37 in a coordinated manner and are combined with the above. The two cover members 83, 84 11 312 / Invention Specification (Supplement) / 92-06 / 92107264 593877 are composed of the fan cover 8 5, the above upper cover member 8 3, the lower cover member 84 and the fan cover 85, Each is made of a synthetic resin. The upper cover member 8 3 is provided with a plurality of engaging claws 8 7... Protruding from the side of the lower cover member 8 4 from the engagement with the lower cover member 8 4.

The V-section cover member 84 is provided with a fastening portion 88 that elastically engages each of the engagement claws 8 7.... In addition, a plurality of fastened portions 89..., 90... Which are abutted on each other by the joint surface 86 are integrally provided on the upper and lower cover members 83, 84. The screws 9 1 ... are fastened to each other. φ In this way, the elastic engagement of the retaining portions 8 8... of the engaging claws 8 7... and the fastening by the screw parts 91... of the fastened portions 89..., 90... The cover members 8 3 and 8 4 are combined with each other, and the head cover 3 8 protrudes toward the front side from the upper and lower cover members 8 3 and 8 4. The fan cover 8 5 is fixed to the box member 3 5 a so as to cover a part of the box member 3 5 a and the fan 7 7 of the crank case 35, and is fastened to the upper part by a plurality of screw parts 92... And lower cover members 83 and 84. The fan cover 85 is provided with a suction tube 94 formed so as to correspond to the outer side of the fan 77. The suction tube 93 is formed toward the fan 77 side to suck air from the outside. The suction port 93 is provided with heat dissipation. Window 95. The heat radiation window 95 is composed of a plurality of, for example, five ring portions 95a to 95d arranged concentrically with the suction tube 94, and radially extending and connecting the suction tube 94, and each of the ring portions 9 5 a to 9 5 d. It is composed of a plurality of connecting portions 9 5 e.. At a position corresponding to these connecting portions 9 5 e ..., the phase aligned with the crank shaft 44 is indicated on the outside of the fan cover 85, for example, a triangle. Shaped timing mark 12 312 / Invention Specification (Supplement) / 92-06 / 92107264 593877 96. The timing mark 96 is a time user for aligning the points, and uses one of a plurality of, for example, four bolts 78... For fixing the fan 77 to the crank shaft 44. The connection portion 95 e of the timing mark 96 can easily perform phase matching at the time for ignition. The timing mark 96 is used not only for time alignment for ignition, but also for time alignment of TDC and BDC. In addition, the moving valve mechanism 52 is configured to change the intake valve 49 and the exhaust valve 50. The case of at least one operating characteristic can also be used for time alignment in which the operating characteristic changes. Referring to FIG. 9 and FIG. 10, a flat mounting surface 97 for opening the suction port 47 is provided on the upper side of the cylinder head 37. The mounting surface 97 is fixed with an insulator 99 and fixed to the input pipe 98. The lower end. The lower end of the input pipe 98 is integrally provided with a flange portion 98a, and the insulator 99 having the suction hole 100 communicating with the suction port 47 and the mounting surface 97 are formed to have a shape corresponding to the flange portion 98a. On both sides of the insulator 99, pads 101 and 102 that surround the suction hole 100 without seams are mounted. One gasket 101 is mounted between the insulator 99 and the mounting surface 97, and the insulator 99 and the flange are mounted. A washer 102 is mounted between the portions 98a. In addition, the thickness T of the insulator 99 is set to be larger than the interval S between the mounting surface 97 and the cover member 83 on the upper portion of the enclosure 82. On both sides of the suction port 47, the mounting surface 97 is provided with bottomed screw holes 103 and 103. Bolts 104 and 104 inserted through the flange portion 98a and the insulator 99 are fastened to the above screw holes. 103 and 103, the input pipe 98 can be fastened to the mounting surface 97 through the insulator 99 by tightening the bolts 104 and 104. However, in the cover plate 8 2 covering the cylinder head 37, the upper cover member 8 3 13 312 / Invention Specification (Supplement) / 92-06 / 92107264 593877 is provided with an opening for fitting and positioning the insulator 99. Department 105. As shown in FIG. 10, the opening portion 105 is formed to be larger than the insulator 99, and between the partial side surface of the opening portion 105 and the partial side surface of the insulator 99, a flow passage 8 1 is formed. The incoming cooling air is exhausted to the external exhaust vent ^ 106 °

The upstream end of the above-mentioned input pipe 98 is connected to the downstream end of the gasifier 108 which is arranged behind the input pipe 98 via a connection hose 107, and the upstream end of the gasifier 108 is connected via The tube 10 is connected to the air cleaner 1 10 arranged on the left side of the rear wheel WR. I In FIG. 11, a locomotive starter 1 1 1 which is electrically controlled based on the detection of the temperature detector 7 3 is attached to the gasifier 108. The locomotive starter 111 is provided with a gasifier 108 in a circuitous manner. Is mounted on the gasifier body 1 1 2 with a throttle valve (not shown), and is opened and closed in the middle of the starting gas mixture passage 1 1 3 of the gasifier body 112 of the gasifier 108 . A gas exhaust pipe 114 is fixed to the gasifier body 1 1 2 in the starting gas mixture passage 113 so as to be interposed in a portion upstream of the locomotive starter 1 1 1. A fuel nozzle 1 1 5 which protrudes from a lower portion of the exhaust pipe 1 1 4 at an upper portion is fixed to a lower portion. In addition, a fuel tank 1 16 for storing fuel is fixed to a lower portion of the gasifier body 1 12, and a lower portion of the fuel nozzle 1 15 protrudes into the fuel in the fuel tank 1 16. The locomotive starter 111 has a nozzle that can be inserted into the exhaust pipe I14 freely forward and backward, and is provided at the middle of the passage of the starting gas passage 1 1 3. 1 1 7 needle valve 1 1 8 needle valve 1 1 The position of 8 in the nozzle 1 1 7 is determined by the energization control of the locomotive starter 1 1 1 to determine the flow through the start 312 / Invention Manual (Supplement) / 92-06 / 92107264 14 Mixing gas passage 11 3 The amount of starting gas mixture. A fitting hole 120 is formed between the mating surfaces 86 of the upper and lower cover members 8 3, 8 4 constituting a part of the shroud 82. In addition, the plug cap 1 2 1 connected to the Mars plug 51 has a crotch portion 1 2 1 a which is attached to the outer surface of the upper and lower cover members 8 3 and 8 4 around the fitting hole 1 2 0 and is fitted to the above-mentioned fitting. Hop hole 1 〇1. In the upper and lower cover members 83 and 84, the upper cover member 83 is integrally provided with a shelter portion 1 22 covering the fitting portion of the plug cap 1 2 1 fitted into the fitting hole 120 from above. The front end of the part 1 22, as shown in FIG. 12, forms a stop rotation positioning part 1 2 2 which is abutted and engaged with the plug cap 1 2 1 so as to prevent the plug cap 1 2 1 from rotating around the axis of the Mars plug 5 1. a. The shelter portion 122 is a fitting fitting hole 1 2 1 that covers the plug cap 1 2 1 in a posture that extends from the plug cap 121 to a part of the high-voltage cable 123 connected to the plug cap 121 to the front. In the form of a fitting portion, the rotation-preventing positioning portion 122a is a plug cap 1 2 1 that will increase the strength around the axis of the Martian plug '5 1 by using the elastic force from the high-voltage cable 1 2 3. A method of resisting and receiving the elastic force is formed in the shelter 122. Referring to FIG. 13, the upper cover member 83 integrally forms a clamp mounting base 125 continuously connected with the shelter portion 122. The clamp 124 elastically mounted on the clamp mounting base 125 is continuously connected to the plug cap. 121 of high-voltage cable 1 2 3. In addition, the engine body 34 is supported on the vehicle body frame 25 so that the cylinder head 37 is disposed between the lower portions of the diagonally rising frame portions 29a and 30a at the front of the left and right rear frame tubes 29 and 30. The above-mentioned plug caps 1 2 1 are also disposed in the two obliquely rising frame portions 2 9 a, 15 312 / Invention Specification (Supplement) / 92-06 / 92107264 593877 litter frame portions 2 9 a, 3 0 a The upper part of the ramp frame 3 Oa on the right side of one end of 3 0 a, as shown in FIG. 2, supports the ignition induction coil 1 2 6. One end is connected to the other end of the high-voltage cable 1 2 3 of the ignition induction coil 1 2 6, which is slightly U from the front direction of the above-mentioned plug cap 1 2 1 which is connected to the rotation prevention positioning portion 1 2 2 a. It is folded back and connected to the plug cap 121. Referring to FIGS. 14 to 17, the upper cover member 83 of the enclosure 82 is integrally provided, and the front end portions have engagement protrusions 1 2 8 a, 1 2 8 that face each other and protrude toward each other. a. At the same time, a pair of hooks 1 2 8 and 1 2 8 erected from the outside of the upper cover member 8 3; and connected between the two hooks 1 2 8 and 1 2 8 at the same time, facing each other and from A pair of connecting walls 129 and 130 erected on the outer surface of the upper cover member 83 is provided with right-angled rectangular through holes 131 surrounded by the hooks 128 and 128 and the connecting walls 129 and 130. Between the coupling protrusions 128a and 128a of the two hooks 128 and 128 and the two connecting walls 129 and 130, a plurality of bendable pieces are pressed while being overlapped with each other and pressed into the two hooks 1 2 8 and 1 2 8 The long part, in this embodiment, the cable 133 of the inner flexible long part supported by the two connecting walls 129 and 130, and the outer long flexible part of the outer contacting the two coupling protrusions 128a and 128a. The tube 134 is sandwiched between the engaging protrusions 128a and 128a and the two connecting walls 1 2 and 1 30. The cable 1 3 3 has a soft plastic sheath and is connected to the temperature detector 73. The tube 1 3 4 made of a hard elastic material is connected to the head cover 38 for guiding aeration gas. Further, the hook 128 is connected to the upper cover 16 312 / Invention Specification (Supplement) / 92-06 / 92107264 member 8 3 of the base plate portion 1 2 8b by the entire length of the base end portion; and along the cable line 1 3 3 and the tube 1 3 4 are provided at a plurality of positions spaced apart from each other in the longitudinal direction, for example, two parts are connected to the substrate portion 128b, and at the same time, a plurality of the engaging protrusions 128a are protruded from the front end portion, for example, Two branch plate sections 1 2 8 c and 1 2 8 c constitute a reinforcing wall 1 3 2 that supports the cable 1 3 3 between the two connecting walls 1 2 9 and 1 30, and is attached to each branch plate section. 1 2 8 c and 1 2 8 c are connected between two hooks 1 2 8 and 1 2 8. An exhaust pipe 1 1 8 is connected to the lower side of the cylinder head 37 which is not covered by the surrounding panel 82 so that the upstream end is connected to the exhaust port 48. The exhaust pipe is arranged on the right side of the rear wheel WR. The air muffler 1 1 9 is connected to the downstream end of the exhaust pipe 1 1 8. Pay particular attention to FIGS. 3 and 4. The crank case 35 is connected to the transmission case 1 3 6 extending from the left side of the rear wheel WR in a state forward in the traveling direction of the locomotive. The transmission case 1 3 6 is a case main body 137 which is integrally connected to the case member 3 5b of the above-mentioned crank case 3 5 and is extended to the rear; a first transmission chamber 1 40 is formed between the case main body 137 and from the left side The left side cover 138 fastened to the box body 137; and the right side cover 139 forming a second transmission room 141 between the box body 137 and the right side rear portion of the box body 137. A support arm 142 is protruded from the front of the main body 1 3 7 of the transmission case 1 3 6 so as to be arranged on the side of the cylinder block 36 of the engine E. The support wrist 1 42 is connected to the link mechanism 3 3 is supported on the vehicle body frame 2 5 in a swingable manner. The axle 143 of the rear wheel WR is rotatably supported by the rear portion of the case main body 137 of the transmission case 136 and the right side cover 139. In addition, as shown in FIG. 1, the rear part of the box body 1 3 7 and the car body frame 2 5 behind the rack pipe 2 9 of the ramp frame 17 312 / Invention Specification (Supplement) / 92-06 / 92107264 There are rear buffers 144. The stepless speed changer M is a V-belt type which is housed in the first transmission room 1 40, and a reduction gear set 145 ° is provided between the stepless speed changer M and the axle 1 43. 2 The outer side of the ball bearing 46 is connected to the drive-side transmission pulley 1 46 of the end of the crank shaft 44; it has an axis parallel to the crank shaft 44 and is mounted on the rear and right side cover of the box body 1 37 via a centrifugal clutch 148 1 3 9 A passive-side drive pulley 1 49 on a passive shaft 1 47 which can be rotatably supported; and a seamless triangle-shaped belt 150 wound around two drive pulleys 1 46 and 149. The drive-side transmission pulley 146 is composed of a fixed pulley half 146a fixed to the crank shaft 44 and a movable pulley half 146b slidably mounted on the crank shaft 44. A V-shaped annular groove 1 5 1 is formed between the two pulley halves 146a, 14 6b, and a V-belt 150 is inserted into the annular groove 1 5 1. In addition, on the rear side of the movable pulley half 146b, a slant panel 152 is fixed to the crank shaft 44. A plurality of weight rollers 1 5 are accommodated in a floating state between the movable pulley half 14 6b and the slant panel 1 5 2. 3. When the number of rotations of the crank shaft 44 increases, the weight rollers 153 subjected to the centrifugal force move outward in the radial direction of the crank shaft 44 so that the movable pulley half 14 6b approaches the fixed pulley half 146a. As a result, the contact radius of the V-belt 150 to the two pulley halves 146a, 146b is increased. On the other hand, the passive-side transmission pulley 149 includes a support cylinder 1 5 4 connected to the passive shaft I47 via a centrifugal clutch 148 and supported by the passive shaft 147 as a rotatable support body; The fixed belt 18 312 / Invention Specification (Supplement) / 92-06 / 92107264 593877 wheel half 149a; and it can approach or leave the fixed belt wheel half 149a, and is supported by the support cylinder 154. At the same time, A movable belt / wheel half 149b that imparts elastic potential energy toward the fixed pulley half 149a. A V-shaped annular groove 155 formed between the two pulley half 149a and 149b is inserted with a triangular belt 150. . Further, as the contact radius of the movable belt half 149b with the V-belt 150 to the driving-side transmission pulley 146 increases, the movable belt half 149b decreases the contact radius of the V-belt 150 to the driven-side transmission pulley 149. By moving in the axial direction, stepless speed change in response to the rotation of the crank shaft 44 is performed between the crank shaft 44 and the driven shaft 147. A left cover 1 3 8 of the transmission case 1 3 6 rotatably supports a recoil shaft 156, and an outer end of the recoil shaft 156 is provided with a pedal start pedal 157 (see FIG. 1). In addition, on the inside of the left side cover 138, a recoil shaft 156 is provided between the recoil shaft 1 56 and the crank shaft 44 to transmit the power of the recoil shaft 156 in response to the depression operation of the kick pedal 1 5 7 to the crank. A recoil starter 158 of the shaft 44. The reduction gear set 94 is located between the driven shaft 147 and the axle 143 and is housed in the second transmission room 141. The rotational power of the driven shaft 147 of the stepless transmission M is transmitted to the reduction gear set 94 after deceleration. The axle of the rear wheel WR is 143 °. However, between the front portions of the two rear frame tubes 29 and 30 of the body frame 25, it is arranged on the engine E to support the storage of a helmet and the like. A fuel tank 161 is supported between the rear portions of the two rear frame tubes 29 and 30. In addition, in the two rear frame pipes 29 and 30, the front portion of the upper frame portion 2 9 b of the left rear frame pipe 29 supports the exhaust port 4 8 of the engine E, which can be purified and supplied to the engine frame 19 19 312 / Invention specification ( Supplement) / 92-〇6 / 921〇7264 593877 Secondary air filter 162 for secondary air. The suction port of the secondary air filter 1 62 is connected to the downstream end of the suction pipe 1 63, and the downstream end of the suction pipe 163 is inserted into the right side of the two rear frame pipes 29 and 30. The rear end portion of the upper frame portion 3 Ob of 30. The secondary air control valve 164 provided between the engine E and the secondary air filter 162 is supported by the bracket 1 65 of the diagonally rising frame portion 29a attached to the left rear frame pipe 29. In addition, a connection pipe portion 166 communicating with the inside of the diagonally rising frame portion 29a is provided at a lower portion of the diagonally rising frame portion 29a of the left rear frame pipe 29, and the cooling air is led out from the stepless transmission M of the power unit P. The ventilation pipe 1 67 is connected to the above-mentioned connection pipe portion 166. The vehicle body frame 25 is covered with a synthetic resin vehicle body cover 168. The vehicle body cover 168 includes: a foot cover 169 covering the front of the driver's feet; A pedal 170 provided at the lower portion of the foot guard 1 69; and a side cover 171 connected to the pedal 170 and covering the rear portion of the vehicle body from both sides. The side cover 1 7 1 is provided with a seat 1 7 2 that can open and close the storage box 1 60 and the fuel tank 1 6 1 from above. Hereinafter, the function of the present embodiment will be described. An oil pump 66 is installed on the crank case 35 of the engine body 34 to suck up the lubricant from the lubricant accumulation portion 65 in the crank case 35, and guides the valve mechanism 5 2 for lubrication. The lubricating oil supply path 67 of the lubricating oil is provided on the crankcase 35, the cylinder block 36, the cylinder head 37, and the head cover 38 in communication with the oil pump 66. The temperature detector 73 faces the lubricating oil supply path with its detection element portion 73a. The state of 67 is attached to the engine body 34. 20 312 / Invention Manual (Supplement) / 92-06 / 92107264 593877 In the lubricating oil supply passage 6 7 for guiding the lubricating valve mechanism 5 2 and the lubricating oil discharged from the oil pump 6 6, as long as the engine is running, The operating state and posture are filled with lubricating oil. As described above, by arranging the detection element portion 7 3 a of the temperature detector 7 3 so as to face the lubricating oil supply path 67, the operation of the engine E can be made extremely difficult. The influence of changes in the state and posture can always detect the engine temperature well and quickly, and the temperature detector 73 does not require other complicated structures for detecting the temperature of the lubricating oil. Moreover, since the lubricating oil supply passage 67 is arranged near the intake port 47 in the cylinder head 37 compared with the exhaust port 48, it is extremely unlikely to be caused by the environment from the outer surface portion of the engine body 34. The effect of heat dissipation can detect the engine temperature well even in low rotation (idling state) after the engine E is started, and the engine temperature can often be detected well and quickly. The engine E is configured as a forced air-cooled type in which the cooling blocks 36a, 37a, ... for air cooling are provided on the cylinder block 36 and the cylinder head 37, and the temperature detector 73 is mounted on Since the head cover 38 of the air-cooling fan is not provided, the engine temperature can be accurately detected without being disturbed by the cooling fins 36a ..., 37a ..., and the structure for mounting the temperature detector 73 becomes simple. In addition, the carburetor 108 connected to the suction port 47 is provided with a locomotive starter which is opened and closed by a temperature detector 73 and opens and closes a starting gas mixture path 113 provided in the carburetor 108. Since the engine 1 1 1 is based on the engine temperature accurately detected by the temperature detector 73, the mixture of the air supplied to the engine E at the time of starting is optimized to improve the engine 21 312 / Invention Specification (Supplement) / 92-06 / 92107264 593877 E warm-up performance. In addition, the cylinder block 36 and the cylinder head 37 are covered with a surrounding plate 8 2 formed between the cylinder block 36 and the cylinder head 37 by a flow path 8 1 for circulating air for forced air cooling. A temperature detector .73 is installed in the head cover 3 8 in a way that is not affected by the cooling air of the forced air supply, and the engine temperature can be accurately detected even when the engine is forced air-cooled. Although a flat mounting surface 97 is provided on the side of the upper part of the cylinder head 37 to open the suction port 47, the mounting surface 97 fixes the input pipe 98 via an insulator 99. The upper cover member 83 is provided with an opening portion 105 in which the insulator 109 can be fitted and positioned. According to this, the insulator 99 is positioned and held on the enclosure plate 82 by fitting into the opening 105, and the insulator 99 serves as a guide for the bolts 104 ... which are screwed into the screw holes 103 provided in the mounting surface 97 of the cylinder head 37. Therefore, it is possible to easily perform screwing and tightening of the bolts 104... To the screw holes 103. In addition, since a part of the inside surface of the opening 105 provided on the upper cover member 83 made of synthetic resin and a part of the side surface of the insulator 99 are formed, the exhaust air outlet 106 is formed. Therefore, the exhaust air discharged from the air outlet 106 is used. The warm air is used to warm the input pipe 98, which can improve the performance of warming up. In addition, the mold portion for forming the opening portion 105 during the molding of the upper cover member 83 is set to include a portion corresponding to the above-mentioned exhaust port 106 to increase the size so as to increase the strength. Degree of life. In addition, since the thickness T of the insulator is set to be larger than the interval S between the mounting surface 97 and the surrounding plate 82, the 22 3 invention specification (Supplement) / 92- is pressed against the mounting surface 97. 06/92107264 593877 The insulator 9 9 is fitted into the opening 105, and the insulator 9 9 can be prevented from falling off the enclosure 82 during assembly, which can further improve the assemblability. In addition, the plug cap 121 of the spark plug 51 and the ignition induction coil 126 connected to the right side of the cylinder head 37 are connected via a high-voltage cable 123. However, the ignition induction coil 126 is located at a position closer to the cylinder head. The rear side of the 37 is supported by the right rear frame pipe 30, and one end is connected to the ignition coil 1 2 6 and the other end of the high-voltage cable 1 2 3 is from the front direction of the plug cap 1 2 1 The back is slightly U-shaped, and is connected to the plug cap 1 2 1. Accordingly, the high-voltage cable 1 23 connected to the plug cap 1 2 1 extends forward from the plug cap 121, and even if the plug cap 121 and the vehicle body frame 2 5 are arranged outside the plug cap 1 2 1 The distance between the components, that is, the right rear frame pipe 30 is narrowed, and interference with the vehicle body frame 25 can still be avoided, and the degree of freedom of the high-voltage cable 123 can be increased. At the same time, the high-voltage cable can be set larger. The bending radius of the wire 1 2 3 can improve the durability of the high voltage cable 1 2 3. The shroud 82 is provided with a pair of upper and lower upper and lower cover members 83 and 84 that are coupled to each other so as to cover the cylinder block 36 and the cylinder head 37 in a coordinated manner, and are fitted and connected to the right side of the cylinder head 37. The fitting holes 1 2 0 for the plug caps 1 2 1 of the mounted Mars plug 51 are formed between the mating surfaces 86 of the two cover members 83 and 84. In addition, the upper cover member 83 is integrally provided with a shield portion 122 covering the fitting portion of the plug cap 121 fitted into the fitting hole 120 from above, and uses the elastic force acting from the high-voltage cable 123 to the axis of the Mars plug 51. The plug cap 1 2 1 at the surrounding end is abutted against the elastic force and bears the plug cap 1 2 1 and is connected to the shelter 23 312 / Invention Manual (Supplement) / 92-06 / 92107264 1 The rotation prevention positioning part 1 2 2 a formed on 2 2. That is to say, the plug cap 1 2 1 is pressed against the elastic rotation force acting from the high-voltage cable 1 2 3 and connected to the rotation prevention positioning portion 122 formed on the shelter portion 122. Therefore, it can prevent the engine from running. The plug cap 121 rotates around the axis of the spark plug 51, thereby preventing the vibration of the high-voltage cable 123 and effectively preventing the high-voltage cable 123 from contacting other parts. In addition, since the shield portion 122 covers the fitting portion of the plug-in fitting hole 120 of the plug cap 121 from above, it is possible to prevent contact with and fall on a member higher than the engine body 34, such as storage. Mud water and the like of the box 160 are attached to the connection portion between the high-voltage repair cable 123 and the plug cap 121. In addition, the jig 124 holding the high-voltage cable 123 is attached to the jig mounting seat 125 formed on the upper cover member 83 continuously from the above-mentioned shelter portion 122. Therefore, the high-voltage cable 123 is held near the plug cap 121. In this way, the vibration of the high-voltage cable 123 can be prevented more effectively. In addition, the strength of the shelter 122 can be increased by the clamp mount 125. In addition, the upper cover member 83 of the shroud 82 is integrally provided, and the front end portion has engaging protrusions 12 12a, 128a facing each other and protruding toward each other, and at the same time, from the outside of the upper cover member 83 A pair of erected hooks 1 2 8 and 1 2 8; and a pair of erected hooks 1 2 8 and 1 2 8 which are facing each other and erected from the outside of the upper cover member 8 3 The connecting walls 129 and 130 are also provided with right-angled rectangular through holes 1 31 surrounded by the hooks 128 and 128 and the connecting walls 129 and ^ 130. The coupling protrusions 128a, 128a of the two hooks 128, 128 and the two connecting walls 129, 130 are overlapped with each other and pressed into the two hooks 128, 24 312 / Description of the Invention (Supplement) / 92- 06/92107264 593877 1 2 8 cable 1 3 3 and tube 1 3 4. According to this, when molding the upper cover member 83 made of synthetic resin, a pair of hooks 128 and 128 and a pair of connecting walls 129 and 130 can be integrally formed without a simple mold structure using mold release, even if the locomotive is not used. The parts other than the upper cover member 83 can still stably support the cable 133 and the tube 134 by the two hooks 128 and 128 and the two connecting walls 129 and 130. Therefore, the number of parts and the assembly man-hour can be reduced. At the same time, the cable can be 133 and the tube 134 are stably supported on the flat surface of the upper cover member 83. In addition, the through-holes 1 3 1 are covered by the overlapping cables 1 3 3 and the tubes 1 3 4. When the cable 133 and the tube 134 are supported, the upper cover member 83 cannot be seen through the through-holes 131. That is, within the enclosure 82. In other words, the through-holes 1 3 1 are covered by the cables 1 3 3 and the tubes 1 34 stacked on each other, and the cooling performance of the forced air-cooled engine E is stably maintained by preventing the cooling air from leaking from the surrounding plate 82. The enclosure 82 can support the cable 133 and the tube 134, and the cooling air can be prevented from leaking from the through-hole 131. Therefore, the appearance can be prevented from being lowered without spraying dust on the outer surface side of the enclosure 82. The cable 1 3 3 has a soft plastic sheath and is connected to the temperature detector 73. In addition, the tube 134 is made of a hard elastic material and is used to guide the ventilation gas and is connected to the head cover 38 so that the plastic sheath on the outside of the cable 133 Fully tightly attached to the two connecting walls 1 2 9 and 1 3 0, and at the same time, the outside of the tube 1 3 4 is actually bound with the engaging protrusions 128a, 1 2 8 a of the two hooks 128, 128 before the end, Cables 1 3 3 and tubes 1 3 4 are more reliably supported. Further, the above-mentioned hook 1 28 is connected to the base portion 1 2 8b of the upper cover 25 312 / Invention Specification (Supplement) / 92-06 / 92107264 member 8 3 by the entire length of the base end portion; A plurality of portions spaced apart in the longitudinal direction of the wire 1 3 3 and the tube 1 3 4, for example, two portions are continuously connected to the substrate portion 128 b, and a plurality of the engaging protrusion portions 128 a are protruded from the front end portion. For example, it is composed of two branch plate sections 1 2 8 c and 1 2 8 c, and the reinforcing wall 1 3 2 supporting the cable 1 3 3 between the two connecting walls 1 2 9 and 1 30 is connected to each branch. The plate portions 128c and 128c are connected between the two hooks 128 and 128. For this reason, the cable 133 and the tube 134 can be supported more stably by supporting the inner cable 1 3 3 by the reinforcing wall 1 3 2, and two hooks can be added by the reinforcing wall 1 3 2 1 2 8 and 1 2 8 strength. The embodiments of the present invention have been described above, but the present invention is not limited to the above-mentioned embodiments, and various design changes can be made as long as they do not exceed the scope of the present invention described in the patent application scope. (Effects of the Invention) As described above, according to the invention of claim 1 in the scope of the patent application, the insulator is fitted to the opening so that the insulator is positioned and held on the surrounding board, and the bolt can be easily screwed and fixed to the screw hole. Tight, which improves assembly. In addition, according to the invention in the scope of patent application No. 2, the warm air discharged from the exhaust port is used to warm the input pipe, which can improve the performance of the warm-up. In addition, the mold part for forming the opening part during the molding of the enclosure board includes The part corresponding to the above-mentioned air outlet is set to be relatively large so as to increase the strength, so that the life of the mold can be improved. In addition, according to the invention in the third scope of the patent application, the insulator is fitted into the opening so as to be pressed against the mounting surface, and the insulation can be prevented during assembly 26 312 / Invention Specification (Supplement) / 92-06 / 92107264 593877 The body is detached from the enclosure, which can further improve the assemblability. [Brief description of the drawings] FIG. 1 is a side view of a motorcycle-type locomotive. Fig. 2 is a perspective view of an intermediate portion of the motorcycle-type locomotive when the vehicle body cover and the storage box are omitted. FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1. FIG. 4 is an arrow view taken along arrow 4 in FIG. 3. FIG. 5 is an arrow view taken along arrow 5 in FIG. 3. FIG. 6 is a sectional view taken along line 6-6 in FIG. 3. Fig. 7 is a view when the head cover is viewed from the cylinder head side. FIG. 8 is a sectional view taken along line 8-8 in FIG. 7. FIG. FIG. 9 is an enlarged sectional view taken along line 9-9 in FIG. 6. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. FIG. 11 is a cross-sectional view taken along line 1 1-1 11 in FIG. 4. FIG. 12 is an enlarged sectional view taken along line 1 2-12 in FIG. 5. FIG. 13 is a sectional view taken along line 1 3-13 in FIG. 5. FIG. 14 is an enlarged cross-sectional view taken along line 1 4-14 in FIG. 2. FIG. 15 is a cross-sectional view taken along line 15-15 in FIG. 14. FIG. 16 is a cross-sectional view taken along line 16-16 in FIG. 14. FIG. 17 is a cross-sectional view taken along line 17-17 in FIG. 14. (Explanation of component symbols) C Cylinder axis E Engine M Stepless speed changer 27 312 / Invention manual (Supplement) / 92-06 / 92107264 593877 P Power unit S Interval T Thickness WR Rear wheel WF w 刖 Wheel 25 Body frame 26 Head tube 27 Main frame tube 27a Lower frame portion 27b Low frame portion 28 Crossing tube 29 Rear frame tube 29a Inclined frame portion 29b Upper frame portion 30 Rear frame tube 30a Inclined frame portion 30b Upper frame portion 3 1, A · Fork 32 Directional handle 33 Link mechanism 34 Engine book m 3 5 Crank case 35a Case body part 3 5b Case body part 312 / Instruction Manual (Supplement) / 92-06 / 92107264

28 593877 36 Cylinder block 36a Cooling fins 37 Cylinder head 37a Cooling fins 3 8 Head cover 39 Cylinder cavity 40 Piston 4 1 Combustion chamber 42 Connecting rod 43 Crank pin 44 Crank shaft 4 5 First ball bearing 46 Second ball bearing 47 Suction Port 4 8 Exhaust port 49 Intake valve 50 Exhaust valve 51 Mars plug 52 Actuating valve mechanism 5 3 Intake 5 4 Exhaust cam 55 Camshaft 56 Rocker 57 Rocker 312 / Invention Manual (Supplement) / 92-06 / 92107264 593877 58 Intake side rocker 59 Exhaust side rocker 6 0 Passive sprocket 6 1 Drive sprocket 62 Cam chain 6 3 Storage room 6 4 Drive gear 65 Lubricating oil storage unit 66 Oil pump 67 Lubricating oil Supply path 6 8 Circulation groove 6 9 Circulation hole 70 Ejection hole 7 1 Bottom detection hole 72 Mounting hub 73 Temperature detector 73a Detector element 7 4 Stator 7 5 External rotor 76 Generator 7 7 Fan 77a Base 77b Blade 78 Bolt 30

312 / Instruction of the Invention (Supplement) / 92-06 / 92107264 593877 79 Lubricating oil filter 8 1 Flow passage 8 2 Enclosure 83 Upper cover member 84 Lower cover member 85 Fan cover 86 Joint surface 87 Claw 88 system Stop 8 9 Fastened portion 90 Fastened portion 91 Screw member 92 Screw member 93 Suction port 94 Suction tube 95 Radiating window 95a to 95d Ring portion 95e Connecting portion 96 Timing mark 97 Mounting surface 98 Input tube 98a Flange portion 99 Insulator 100 suction hole 31

312 / Instruction of the Invention (Supplement) / 92-06 / 92107264 593877 10 1 Gasket 102 Washer 103 Screw hole 104 Bolt 10 5 Opening 106 Air outlet 107 Connecting pipe 108 Vaporizer 109 Connecting pipe 110 Air cleaner 111 Locomotive Starter 112 Vaporizer body 113 Starting gas mixture passage 114 Exhaust pipe 115 Fuel nozzle 116 Fuel tank 117 Nozzle 118 Needle valve (see Fig. 11) 118 Exhaust pipe (see Figs. 1 and 6) 119 Exhaust muffler 120 Insert Closure hole 121 Plug cap 1 2 1 a 锷 122 122 Shelter 32

312 / Invention Manual (Supplement) / 92-06 / 92107264 593877 122a Rotation positioning part 123 High-voltage cable 124 Fixture 125 Fixture mount 126 Ignition induction coil 128 Hook 128a Coupling protrusion 128b Base plate portion 128c Branch plate portion 129 Connection Wall 130 Connecting wall 13 1 Through hole 1 32 Reinforcement wall 133 Cable 1 34 Pipe 136 Transmission box 137 Box body 138 Left side cover 139 Right side cover 140 First transmission room 14 1 Second transmission room 142 Support wrist 143 Axle 144 Rear buffer 312 / Invention Manual (Supplement) / 92-06 / 92107264

33 593877 145 Reduction gear set 146 Drive side drive pulley 146a Fixed pulley half 146b Moveable pulley half 147 Passive shaft 148 Centrifugal clutch 149 Driven side drive pulley 149a Fixed pulley half 149b Moveable pulley half 150 V-belt 151 Ring groove 15 2 Inclined panel 15 3 Weight car 154 Support cylinder 15 5 Annular groove 15 6 Recoil shaft 157 Pedal start pedal 158 Recoil starter 160 Storage box 161 Fuel tank 162 Secondary air filter 16 3 Suction Air pipe 16 4 Secondary air control valve 165 Bracket 312 / Invention manual (Supplement) / 92-06 / 92107264 593877 166 Connection pipe section 167 Ventilation pipe 168 Synthetic resin body cover 169 Foot cover 170 Pedal 17 1 Side cover 172 Cover 312 / Invention manual (Supplement) / 92-06 / 92107264

Claims (1)

593877 Patent application scope 1. A suction air connection structure of a forced air-cooled engine, which is provided on the cylinder head (37) covered by a panel (82) with a mounting surface for opening the suction port (4 7) ( 97), the air-cooled engine suction connection structure of the mounting surface (97) with an insulator (9 9) interposed therebetween and fixed to the input pipe (98), is characterized by: There is an opening (105b) for fitting and positioning the insulator (99). 2. The air intake connection structure of the forced air-cooled engine as described in the first item of the patent application scope, wherein the enclosure (82) made of synthetic resin is provided. An air outlet (106) is formed between a part of the inner side surface of the opening (105) and a part of the insulator (99). 3 · For example, the air-suction connection structure of the forced air-cooled engine in the second patent application scope, Among them, the thickness of the insulator (9 9) is set to be larger than the interval between the mounting surface (9 7) and the surrounding board (8 2). 36 312 / Invention Specification (Supplement) / 92-06 / 92107264