KR20030093971A - Engine temperature detecting device of engine - Google Patents

Abstract

An engine pump having a crankcase, a cylinder block, and a cylinder head is attached to an oil pump for pumping oil from an oil reservoir formed in the lower portion of the crankcase, and guides oil for lubricating a valve driving mechanism. The oil supply passage is connected to the oil pump so that at least the cylinder block and the cylinder head are installed in the engine, so that the engine is not affected by the change in the operating state and attitude of the engine and the heat dissipation caused by the environment at the outer surface of the engine. In order to always make the engine temperature favorable and to detect it quickly with a simple structure, the oil supply passage 67 is arrange | positioned in the cylinder head 37 at the position closer to the intake port 47 rather than the exhaust port 48, The temperature detector is attached to the engine main body 34 with its detection element portion directed to the oil supply passage 67.

Description

Engine temperature detection apparatus in an engine {ENGINE TEMPERATURE DETECTING DEVICE OF ENGINE}

The present invention is attached to an engine body having a crankcase, a cylinder block and a cylinder head, an oil pump for pumping oil from an oil reservoir formed in the lower portion of the crankcase, to guide oil for lubricating the valve drive mechanism. The oil supply passage relates to an engine that is continuous to the oil pump and is installed at least in the cylinder block and the cylinder head.

In the engine temperature detection device disclosed in Japanese Patent Laid-Open No. 2000-213326, a temperature detector for detecting oil temperature in an oil return passage provided in a cylinder block is attached to a cylinder block in order to return oil from a cylinder head to an oil pan. In addition, the oil temperature detection device disclosed in Japanese Patent Application Laid-Open No. 2-22209 has a configuration in which oil is jetted from a dedicated jet hole toward a detection part of an oil temperature sensor attached to the head cover.

In the Japanese Patent Application Laid-Open No. 2000-213326, however, the temperature detector is provided in the oil return passage, and the passage diameter of the oil return passage is set large so as to secure the amount of oil returned. As the flow rate of the oil varies depending on the operating state, it is difficult to always accurately detect the engine temperature, and it is easy to be affected by heat dissipation caused by the environment at the engine outer surface portion. In addition, in the Japanese Laid-Open Patent Publication No. 2-22209, not only the oil supply passage is complicated, but also the amount of oil related to the detection unit of the oil temperature sensor may change depending on the engine posture change and the rotation speed, It was also difficult to detect the engine temperature at low rotation (idling state after starting).

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the engine temperature is always detected well and quickly with a simple configuration, without being affected by changes in the operating state and attitude of the engine and heat radiation caused by the environment on the outer surface of the engine. It is an object of the present invention to provide an engine temperature detection device in an engine.

In order to achieve the above object, the invention according to claim 1, an oil pump for pumping oil from an oil reservoir formed in the lower part of the crankcase is attached to an engine body having a crankcase, a cylinder block and a cylinder head, In an engine in which an oil supply passage for guiding oil for lubricating a valve drive mechanism is continuous to the oil pump and installed at least in a crankcase, a cylinder block, and a cylinder head, the oil supply passage is exhausted from the cylinder head. It is arranged in a position closer to the intake port than the port, and the temperature detector is attached to the engine main body with its detection element portion directed to the oil supply passage.

According to this configuration, the oil supply passage for guiding oil discharged from the oil pump to lubricate the valve drive mechanism is filled with oil regardless of the operation state and attitude as long as the engine is operated, and the detection element portion of the temperature detector Since the oil supply passage is disposed toward the oil supply passage, and the oil supply passage is disposed close to the intake port, the engine is started while not being greatly influenced by the operating state of the engine, the change in posture, and the heat radiation caused by the environment at the outer surface of the engine. The engine temperature can be satisfactorily detected even at a later low rotation, the engine temperature can always be detected well and quickly, and no complicated structure is required to detect the oil temperature in the temperature detector.

In addition, the invention of claim 2, in addition to the configuration of the invention of claim 1, the engine main body in which the cooling fins for air cooling are provided in the cylinder block and the cylinder head so that a part of the oil supply passage is formed. A head cover coupled to the cylinder head, wherein the temperature detector is attached to the head cover. According to this configuration, by attaching the temperature detector to the head cover on which the cooling fin is not installed in the air-cooled engine, The engine temperature can be detected accurately without disturbing the cooling fins, and the structure for attaching the temperature detector is also simplified.

The invention according to claim 3 is, in addition to the configuration of the invention according to claim 1, a starter mixer in which a motorcycle starter, which is energized and controlled in accordance with the detection value of the temperature detector, is supplied to the carburetor connected to the intake port. Characterized in that the passage is attached to open and close the passage, according to this configuration, according to the engine temperature accurately detected by the temperature detector, to optimize the mixer supplied to the engine at start-up, to improve the engine performance of the engine Can be.

In addition, the invention of claim 4 is provided with a flow path through which the cylinder block and the cylinder head let air for forced air cooling flow between the cylinder block and the cylinder head, in addition to the configuration of the invention of claim 2. It is characterized by covering with a shroud, and according to this configuration, by placing the temperature detector at a position not affected by the forcibly blown cooling wind, it is possible to detect an accurate engine temperature while being a forced air-cooled engine.

1 is a side view of a scooter type motorcycle.

2 is a perspective view of the middle portion of a scooter-type motorcycle with the body cover and the storage box omitted;

3 is an enlarged cross-sectional view taken along line 3-3 of FIG. 1.

4 is a view seen from arrow 4 of FIG.

FIG. 5 is a view seen from arrow 5 of FIG. 3.

6 is a cross-sectional view taken along line 6-6 of FIG. 3.

7 is a view of the head cover seen from the cylinder head side.

8 is a cross-sectional view taken along line 8-8 of FIG.

9 is an enlarged cross-sectional view taken along line 9-9 of FIG. 6.

10 is a cross-sectional view taken along line 10-10 of FIG.

FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. 4.

12 is an enlarged cross-sectional view taken along a line 12-12 of FIG. 5.

FIG. 13 is a cross-sectional view taken along line 13-13 of FIG. 5.

14 is an enlarged cross-sectional view taken along line 14-14 of FIG. 2.

15 is a cross-sectional view taken along the 15-15 line of FIG.

16 is a cross-sectional view taken along line 16-16 of FIG. 14.

17 is a cross-sectional view taken along line 17-17 of FIG. 14.

<Explanation of symbols for the main parts of the drawings>

34: engine body 35: crankcase

36: cylinder block 36a, 37a: cooling fin

37: cylinder head 38: head cover

47: intake port 48: exhaust port

52: valve drive mechanism 65: oil reservoir

66: oil pump 67: oil supply passage

73 temperature detector 73a detection element

81: by distribution 82: shroud

108: Carburetor 111: Motorcycle Starter

113: Mixer passage for starting

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described according to one Example of this invention shown in an accompanying drawing.

1 to 17 show an embodiment of the present invention, Figure 1 is a side view of the scooter-type motorcycle, Figure 2 is a perspective view of the middle portion of the scooter-type motorcycle with the body cover and storage box omitted, 3 is an enlarged sectional view taken along line 3-3 of FIG. 1, FIG. 4 is a view seen from arrow 4 of FIG. 3, FIG. 5 is a view seen from arrow 5 of FIG. 3, and FIG. 6 is a sectional view taken along line 6-6 of FIG. 7 is a view of the head cover from the cylinder head side, FIG. 8 is a sectional view taken along line 8-8 of FIG. 7, FIG. 9 is an enlarged sectional view taken along line 9-9 of FIG. 6, and FIG. 10 is a sectional view taken along line 10-10 of FIG. 9. 11 is a sectional view taken along line 11-11 of FIG. 4, FIG. 12 is an enlarged sectional view taken along line 12-12 of FIG. 5, FIG. 13 is a sectional view taken along line 13-13 of FIG. 5, and FIG. 14 is an enlarged sectional view taken along line 14-14 of FIG. 15 is a sectional view taken along line 15-15 of FIG. 14, FIG. 16 is a sectional view taken along line 16-16 of FIG. 14, and FIG. 17 is a sectional view taken along line 17-17 of FIG.

First, in FIGS. 1 and 2, the body frame 25 of the scooter type motorcycle is fixed at right angles to the main frame pipe 27 having the head pipe 26 fixed to the front end and to the rear end of the main frame pipe 27. And a rear frame pipe 29, 30 as a pair of left and right rear frame members each of which is provided with a front end connected to both ends of the cross pipe 28, respectively.

The main frame pipe 27 has a down frame portion 27a inclined rearward and downward from the head pipe 26 and a lower frame portion 27b extending almost horizontally rearward from the rear end of the down frame portion 27a. It is made by connecting and installing. In addition, the left and right pairs of rear frame pipes 29 and 30 are substantially extended from the rear ends of the rise frame portions 29a and 30a and the rise frame portions 29a and 30a extending rearward from both ends of the cross pipe 28. The upper frame portions 29b and 30b, which are curved in the horizontal plane so as to extend horizontally to the rear and the rear end openings face each other, are integrally connected to each other.

The head fork 26 is axially supported by the front fork 31 for supporting the front wheels WF, and a steering handle 32 is connected to the upper end of the front fork 31.

The front part of the power unit P is supported by the front part of both rear frame pipes 29 and 30 in the vehicle body frame 25 so that it can rock up and down via the link mechanism 33, and this power unit P The rear wheel WR disposed on the right side of the rear portion of the sx is supported axially on the rear portion of the power unit P.

3 to 6, the power unit P is formed between the engine E which is four cycles of a forced air-cooled single cylinder disposed in front of the rear wheel WR, and is formed between the engine E and the rear wheel WR. It consists of a continuously variable transmission (M).

The engine body 34 of the engine E has a crankcase 35, a cylinder block 36 coupled to the crankcase 35, and a cylinder coupled to the cylinder block 36 on the opposite side to the crankcase 35. Disposed between both rear frame pipes 29 and 30 of the vehicle body frame 25 with a head 37 and a head cover 38 coupled to the cylinder head 37 on the opposite side to the cylinder block 36, The cylinder head 37 is disposed between the lower portions of the rise frame portions 29a and 30a which are the front portions of both rear frame pipes 29 and 30.

The cylinder block 36 is arranged such that the axis of the cylinder bore 39 provided in the cylinder block 36, that is, the cylinder axis C, rises slightly forward along the front and rear direction of the motorcycle, and is approximately horizontal, and the cylinder head ( The combustion chamber 41 is formed between 37 and the piston 40 slidably fitted to the cylinder bore 39. In addition, the piston 40 is connected to the crankshaft 44 having a rotation axis parallel to the rotation axis of the rear wheel WR through the connecting rod 42 and the crank pin 43.

The crankshaft 44 rotates in the crankcase 35 including the cylinder axis C and a pair of case portions 35a and 35b coupled in a plane orthogonal to the axis of the crankshaft 44. If possible, the crankshaft 44 has a first ball bearing 45 between one case member 35a and the crankshaft 44, and the other case member 35b and the crankshaft 44. The second ball bearing 46 is sandwiched between the holes.

An intake port 47 is provided on the upper side of the cylinder head 37 to the combustion chamber 41, and an exhaust port 48 is installed on the lower side of the cylinder head 37 to the combustion chamber 41. do. The intake valve 49 and the exhaust valve 50 which open and close the intake port 47 and the exhaust port 48, respectively, are arranged in a substantially V-shape on a projection onto a plane perpendicular to the rotational axis of the crankshaft 44. Are provided in the cylinder head 37, and receive spring force in the direction of closing the intake port 47 and the exhaust port 48, respectively. Further, a spark plug 51 directed to the combustion chamber 41 is attached to at least one side of the left and right sides of the cylinder head 37, in this embodiment, to the right side in a state facing forward of the traveling direction of the motorcycle.

A valve drive mechanism 52 for opening and closing the intake valve 49 and the exhaust valve 50 is housed between the cylinder head 37 and the head cover 38, and the valve drive mechanism 52 has a crankshaft. A cam shaft 55 having an axis parallel to the axis of 44 and rotatably supported by the cylinder head 37 and having intake and exhaust cams 53 and 54, and parallel to the cam shaft 55 The intake side rocker shafts 56 and 57 supported by the cylinder head 37 with one axis and driven by the intake cam 53 to drive the intake valve 49 so as to drive the intake side rocker shaft ( 56 which is swingably supported by the exhaust side rocker shaft 57 by being driven by the intake side rocker arm 58 and the exhaust cam 54 so as to be able to open and close and drive the exhaust valve 50. An exhaust side rocker arm 59 is provided.

A driven sprocket 60 is fixed to one end of the cam shaft 55. On the other hand, in the crankshaft 44, the drive sprocket 61 is fixed to the position corresponding to the driven sprocket 60 from the outside of the second ball bearing 46, and the drive and driven sprockets 61, 60 are An endless cam chain 62 is wound, and the cam chain 62 is housed in a storage chamber 63 formed over the cylinder block 36, the cylinder head 37, and the head cover 38 so as to travel. By this drive sprocket 61, driven sprocket 60, and cam chain 62, the camshaft 55 is rotationally driven at the rotation speed 1/2 of the rotation speed of the crankshaft 44. As shown in FIG.

The drive gear 64 is fixed to the crankshaft 44 outside the first ball bearing 45, and is oil strainer 79 from the oil reservoir 65 formed at the lower portion of the crankcase 35. The oil pump 66 attached to the crankcase 35 is pumped by the drive gear 64 to pump oil through the pump.

Part of the oil discharged from the oil pump 66 is used to lubricate the valve drive mechanism 52, and the crankcase 35, the cylinder block 36, the cylinder head 37 and the head cover 38 are used. There is formed an oil supply passage 67 for guiding oil from the oil pump 66 to the valve drive mechanism 52. In the cylinder head 37, an oil supply passage 67 is disposed at a position closer to the intake port 47 than the exhaust port 48. In this embodiment, the oil supply passage 67 is disposed in a plane perpendicular to the axis of the crankshaft 44. The oil supply passage 67 is disposed at a position crossing the intake port 47 on the projection diagram.

Referring to FIGS. 7 and 8 together, the downstream end of the oil supply passage 67 allows the oil from the cylinder head 37 side to be supplied at one end to the engagement surface of the head cover 38 to the cylinder head 37. And a circulation groove 68 formed at the inner side of the distribution hole 69 and a bottomed distribution hole 69 which is continuous to the other end of the distribution groove 68 and is provided on the side wall of the head cover 38. A blowing hole 70 continuous at the end is provided on the inner surface of the side wall of the head cover 38 to blow oil toward the valve drive mechanism 52.

In addition, the head cover 38 is provided with a bottomed detection hole 71 continuous at one end of the distribution groove 68 and at the same time as the outer surface of the head cover 38 at a position corresponding to the detection hole 71. An attachment boss 72 protruding from the outside to the outside is integrally provided, and the attachment boss 72 protrudes the detection element portion 73a into the detection hole 71 so that the temperature detector 73 is provided. Attached. That is, the temperature detector 73 is attached to the head cover 38 of the engine main body 34 with the oil supply passage 67 facing the detection element portion 73a.

3, the stator 74 is fixed to the crankcase 35 outside the drive gear 64, and the outer rotor 75 is fixed to the crankshaft 44 so as to surround the stator 74. Is provided with a generator (76), and a fan (77) is fixed to the crankshaft (44) from the outside of the generator (76). The fan 77 has a plurality of vanes 77b, 77b... On the outer periphery of the base 77a fastened to the outer rotor 75 of the generator 76 by a plurality of bolts 78, 78... ) Is integrally installed.

At least a cylinder block 36 and a cylinder head 37 of the engine body 34, in this embodiment a part of the crankcase 35, the cylinder block 36 and the cylinder head 37 are covered with a shroud 82 and Forced air cooling air discharged from the fan 77 passes through the flow path 81 formed between the engine main body 34 and the shroud 82. In addition, on the outer surfaces of the cylinder block 36 and the cylinder head 37, a plurality of cooling fins 36a... 37a..., Respectively protrude in order to enable efficient cooling by the cooling air flowing through the flow path 81. Is installed.

The shroud 82 includes a pair of upper and lower upper and lower cover members 83 and 84 and a portion of the crankcase 35 which are coupled to each other by cooperatively covering the cylinder block 36 and the cylinder head 37. The fan cover 85 is covered and coupled to both cover members 83 and 84, and the upper cover member 83, the lower cover member 84, and the fan cover 85 are each formed of a synthetic resin.

The upper cover member 83 is provided with a plurality of fitting claws 87... Protruding from the fitting face 86 with the lower cover member 84 toward the lower cover member 84. 84 is provided with engaging portions 88... For elastically fitting the respective fitting hooks 87. In addition, the upper and lower cover members 83 and 84 are integrally provided with a plurality of fastened portions 89... 90... 90... Are mutually fastened by the screw member 91.

In this way, the upper and lower cover members (by elastic fitting of the fitting hooks 87... To the locking portions 88... And fastening of the fastening portions 89... 83 and 84 are mutually coupled, and the head cover 38 protrudes forward from the upper and lower cover members 83 and 84.

The fan cover 85 is fastened to the case member 35a by covering the case member 35a and the fan 77, which are part of the crankcase 35, and is fastened to the case member 35a by the plurality of screw members 92. It is fastened to the cover member 83 and 84.

The fan cover 85 has a suction cylinder 94 which forms a suction hole 93 for sucking air from the outside toward the fan 77 side, and corresponds to the fan 77 from the outside thereof. The louver 95 is provided in the suction hole 93.

The louvers 95 are provided with a plurality of, for example, four ring portions 95a to 95d arranged concentrically with the suction cylinder 94, and extend radially between the suction cylinder 94 and each of the ring portions 95a to 95d. It is composed of a plurality of connecting portions (95e ...) for connecting the, and in order to match the phase of the crankshaft 44 to the outer surface of the fan cover 85 at a position corresponding to one of these connecting portions (95e ...) For example, the triangle timing mark 96 is indicated. The timing mark 96 is for adjusting the timing for ignition, for example. The crankshaft 44 of the fan 77 is connected to the connection portion 95e of the louver 95 corresponding to the timing mark 96. By matching one of the plurality of bolts (for example, four bolts 78...) To be fixed to each other, the phase alignment of the timing for ignition can be facilitated.

In addition, the timing mark 96 may be used not only for timing alignment for ignition, but also for timing alignment of TDC and BDC, and the valve drive mechanism 52 may include at least one of the intake valve 49 and the exhaust valve 50. In the case where the operating characteristic of the page is configured to be changeable, it may be used to match the timing of the operating characteristic change.

9 and 10 together, the upper side of the cylinder head 37 is formed with a flat attachment surface 97 which opens the intake port 47, and the attachment surface 97 has an inflow pipe 98. The downstream end of is fastened via an insulator (99, insulator).

At the downstream end of the inflow pipe 98, a flange portion 98a is integrally provided, and the insulator 99 having the intake hole 100 through the intake port 47 and the attachment surface 97 are the flange portion. It is formed to have a shape corresponding to 98a.

Gaskets 101 and 102 are provided on both sides of the insulator 99 to surround the intake hole 100 in an endless shape, and one dog is interposed between the insulator 99 and the attachment surface 97. The gasket 102 is fitted between the insulator 99 and the flange portion 98a. Moreover, the thickness T of the insulator 99 is set larger than the space | interval S between the attachment surface 97 and the upper cover member 83 in the shroud 82.

On both sides of the intake port 47, the attachment surface 97 is formed with threaded holes 103 and 103 with bottoms, and bolts 104 and 104 inserted into the flange portion 98a and the insulator 99 are provided. The screw holes 103 and 103 are screwed into the respective screw holes 103 and 103, and the bolts 104 and 104 are tightened so that the inflow pipe 98 is fastened to the attachment surface 97 through the insulator 99.

However, an opening 105 for fitting and positioning the insulator 99 is formed in the upper cover member 83 of the shroud 82 covering the cylinder head 37. This opening 105 is formed larger than the insulator 99, as shown in FIG. 10, and has flowed through the flow path 81 between some side surfaces of the opening 105 and some side surfaces of the insulator 99. Ventilation openings (106, 排風 口) for discharging the cooling air to the outside is formed.

The upstream end of the inlet pipe 98 is connected via a connecting hose 107 to a downstream end of the vaporizer 108 disposed behind the inlet pipe 98, and the upstream end of the vaporizer 108 is connected to the rear wheel ( The air cleaner 110 disposed on the left side of the WR is connected via a connecting tube 109.

In Fig. 11, the motorcycle starter 111 is provided with the carburetor 108, which is energized and controlled according to the detected value of the temperature detector 73, and the motorcycle starter 111 is provided with a throttle valve provided in the vaporizer 108. (Not shown) to open and close the middle of the starter mixer passage 113 formed in the vaporizer body 112 of the vaporizer 108 and attached to the vaporizer body 112.

A bleed tube 114 is fixed to the carburetor main body 112 so as to be interposed on the upstream side of the motorcycle starter 111 in the starting mixer passage 113, and a lower portion of the bleed tube 114 is provided. The fuel nozzle 115, which allows the upper part to protrude, is fixed to the lower part of the carburetor body 112. In addition, a fuel case 116 for storing fuel is fixed to the lower part of the vaporizer body 112, and the lower part of the fuel nozzle 115 protrudes into the fuel in the fuel case 116.

The motorcycle starter 111 has a needle valve 118 inserted into the nozzle 117 provided in the middle of the starter mixer passage 113 downstream from the bleed tube 114 so as to be advanced and retracted. Position in the nozzle 117 is determined by the energization control of the motorcycle starter 111, and accordingly the amount of the starting mixer for circulating the starting mixer passage 113 is determined.

A fitting hole 120 is formed between the fitting surfaces 86 of the upper and lower cover members 83 and 84 constituting part of the shroud 82. In addition, the plug cap 121 connected to the spark plug 51 has a shading portion 121a that contacts the outer surfaces of the upper and lower cover members 83 and 84 around the fitting hole 120. The fitting hole 120 is fitted.

In addition, among the upper and lower cover members 83 and 84, the upper cover member 83 is integrally provided with a lid 122 covering the fitting portion of the plug cap 121 to the fitting hole 120 from the upper side, As shown in FIG. 12, the tip of the lid 122 is in contact with and engaged with the plug cap 121 so as to prevent rotation of the plug cap 121 about the axis of the spark plug 51. The stop position determiner 122a is formed.

The cover 122 is a fitting hole of the plug cap 121 which is in a posture extending at least a portion of the high tension cord 123 connected to the plug cap 121 from the plug cap 121 forward. It is formed so as to cover the fitting portion to 120 from above, and the rotation stop positioning portion 122a is a force applied to one side around the axis of the spark plug 51 by an elastic force acting from the high tension cord 123. The plug cap 121 is formed on the cover 122 to resist the elastic force.

Referring to FIG. 13 together, the upper cover member 83 is integrally formed with a clamp attachment sheet 125 that is continuous to the lid 122, and is a clamp elastically attached to the clamp attachment sheet 125. At 124 a high tension cord 123 continuous to the plug cap 121 is maintained.

By the way, the engine main body 34 arrange | positions the cylinder head 37 between the lower parts of the rise frame parts 29a and 30a of the front part in the left and right pair of rear frame pipes 29 and 30, and the vehicle body frame 25 And the plug cap 121 is also disposed between the lower portions of both rise frame portions 29a and 30a, and the right side of the rise frame portion 30a, which is one side of both rise frame portions 29a and 30a. At the top, the ignition coil 126 is supported, as indicated in FIG.

The other end of the high tension cord 123, one end of which is continuous to the ignition coil 126, is substantially U-shaped from the front to the rear than the plug cap 121 engaged with the rotation stop positioning portion 122a. It is bent back and connected to the plug cap 121.

14 to 17, the upper cover member 83 of the shroud 82 has the engaging projections 128a and 128a protruding toward the mutually adjacent sides with the distal ends, and face each other with the upper cover member 83 facing each other. A pair of hooks 128 and 128 emanating from the outer surface of the upper wall member 129 and a pair of connecting walls 129 emanating from the outer surface of the upper cover member 83 to face each other while connecting between the hooks 128 and 128. And 130 are integrally installed, and a rectangular quadrilateral through hole 131 is formed which is surrounded by these hooks 128 and 128 and connecting walls 129 and 130.

A plurality of bendable longs which are laminated between the engaging projections 128a and 128a of both hooks 128 and 128 and both connecting walls 129 and 130 and are pushed between the hooks 128 and 128 at the same time. In this embodiment, the component is fitted, and in this embodiment, the cable 133, which is a long component that can be bent inwardly received by both connecting walls 129 and 130, and the two engaging projections 128a and 128a are in contact with the outer surface. A long bendable tube 134 is sandwiched between the engaging projections 128a and 128a and both connecting walls 129 and 130.

The cable 133 has a soft vinyl coating and is continuous to the temperature detector 73, and the tube 134 made of a hard elastic material is connected to the head cover 38 for guiding the bridger gas. It is.

In addition, the hook 128 has a plurality of locations spaced apart in the longitudinal direction of the cable portion 133 and the tube 134 and the substrate portion 128b in which the base end portion is continuous over the entire length of the upper cover member 83. For example, it consists of a plurality of branch plate parts 128c and 128c which are continuous to the said board | substrate part 128b at two places, and the engaging part 128a protrudes at the front end part, and is provided, for example, A reinforcing wall 132 for receiving the cable 133 between both connecting walls 129 and 130 is provided between the hooks 128 and 128 between the respective branch plate portions 128c and 128c.

The exhaust pipe 118 'is connected to the lower side surface of the cylinder head 37 which is not covered with the shroud 82 so that the upstream end is continuously connected to the exhaust port 48, and the exhaust gas is disposed on the right side of the rear wheel WR. The downstream end of the exhaust pipe 118 ′ is connected to the muffler 119.

With particular attention to FIGS. 3 and 4, the crankcase 35 is connected with a transmission case 136 extending to the left side of the rear wheel WR in a state in which the driving direction of the motorcycle is forward. The transmission case 136 is integrally connected to the case member 35b of the crankcase 35 and extends rearwardly between the case main body 137 and the case main body 137. A second transmission chamber 141 is formed between the left cover 138 fastened from the left side to the case main body 137 and the case main body 137 by forming a 140 and the right rear part of the case main body 137. It consists of a right cover 139 fastened to.

The support arm part 142 protrudes and is installed in the front part of the case main body 137 in the transmission case 136 so that it may be arrange | positioned to the side of the cylinder block 36 in the engine E. The arm portion 142 is rocked and supported on the vehicle body frame 25 through the link mechanism 33.

The axle 143 of the rear wheel WR is rotatably supported by the rear of the case main body 137 and the right cover 139 in the transmission case 136. As shown in FIG. 1, a rear cushion 144 is provided between the rear portion of the case main body 137 and the upper frame portion 29a of the rear frame pipe 29 of the vehicle body frame 25. do.

The continuously variable transmission mechanism M is a V belt type housed in the first transmission chamber 140, and a speed reduction gear train 145 is provided between the continuously variable transmission mechanism M and the axle 143.

The continuously variable transmission mechanism M has a drive main transmission pulley 146 connected to an end of the crankshaft 44 at the outside of the second ball bearing 46 and an axis parallel to the crankshaft 44 and having a case main body ( On the driven side electric pulley 149 which is mounted via the centrifugal clutch 148 to the driven shaft 147 rotatably supported by the rear part and the right cover 139 of 137, and both the electric pulleys 146 and 149 The winding has an endless V belt 150.

The drive-side electric pulley 146 is composed of a fixed pulley half body 146a fixed to the crankshaft 44 and a movable pulley half body 146b mounted to the crankshaft 44 so as to be axially slidable. A V-shaped annular groove 151 is formed between both pulley halves 146a and 146b, and the V belt 150 is inserted into the annular groove 151. Further, the lamp plate 152 is fixed to the crankshaft 44 on the rear side of the movable pulley half body 146b, and a plurality of weight rollers 153 are floated between the movable pulley half body 146b and the lamp plate 152. It is accepted in a state of movement. In addition, when the rotation speed of the crankshaft 44 increases, the weight roller 153 which receives a centrifugal force moves to the outer side of the crankshaft 44 in the radial direction, and moves the movable pulley half body 146b to the fixed pulley half body 146a. Let's do it. Thereby, the contact radius of the V belt 150 to both pulley halves 146a and 146b becomes large.

On the other hand, the driven-side electric pulley 149 is connected to the driven shaft 147 via a centrifugal clutch 148, and is supported by the support cylinder 154 rotatably supported by the driven shaft 147, and the support cylinder 154. The fixed pulley half body 149a which is formed integrally, and the direction close to the fixed pulley half body 149a while being supported by the support cylinder 154 by enabling the proximity transfer with respect to this fixed pulley half body 149a is possible. The V-belt 150 is inserted into the V-shaped annular groove 155 formed between the two pulley halves 149a and 149b. Moreover, as the contact radius of the V belt 150 to the drive side electric pulley 146 increases, the movable pulley half body 149b becomes smaller so that the contact radius of the V belt 150 to the driven side electric pulley 149 becomes smaller. The movable pulley half body 149b moves in the axial direction, whereby a stepless speed change is performed in accordance with the rotation of the crankshaft 44 between the crankshaft 44 and the driven shaft 147.

The kick shaft 156 is rotatably supported by the left cover 138 of the transmission case 136, and the kick pedal 157 (refer FIG. 1) is provided in the outer end of this kick shaft 156. As shown in FIG. In addition, on the inner surface side of the left cover 138, between the kick shaft 156 and the crankshaft 44, the power of the kick shaft 156 according to the stepping operation of the kick pedal 157 is transmitted to the crankshaft 44. The kick-starter 158, which enabled it, is installed.

The reduction gear train 145 is installed between the driven shaft 147 and the axle 143 to be stored in the second transmission chamber 141, and the rotational power of the driven shaft 147 in the continuously variable transmission M is decelerated. It is decelerated in the gear train 145 and transmitted to the axle 143 of the rear wheel WR.

By the way, between the front parts of both rear frame pipes 29 and 30 in the body frame 25, the storage box 160 which can accommodate a helmet etc. is supported so that it may be arrange | positioned above the said engine E, The fuel tank 161 is supported between the rear portions of both rear frame pipes 29 and 30.

In addition, secondary air supplied to the exhaust port 48 of the engine E is supplied to the front portion of the upper frame portion 29b of the rear frame pipe 29 on the left side of both rear frame pipes 29 and 30. A secondary air cleaner 162 for purging is supported. The downstream end of the intake tube 163 is connected to the inlet port of the secondary air cleaner 162, and the upstream end of the intake tube 163 is the rear frame on the right side of both rear frame pipes 29 and 30. It is inserted into the rear end of the upper frame part 30b in the pipe 30.

The secondary air control valve 164 provided between the engine E and the secondary air cleaner 162 is attached to the top of the rise frame portion 29a of the rear frame pipe 29 on the left side. Is supported.

Moreover, the connection pipe part 166 which penetrates into this rise frame part 29a is provided in the lower part of the rise frame part 29a in the left rear frame pipe 29, and the continuously variable transmission of the power unit P is provided. A duct 167 for guiding cooling air from inside M is connected to the connection pipe portion 166.

The body frame 25 is covered with a body cover 168 made of synthetic resin, and the body cover 168 is a leg shield 169 covering the front of the driver's foot and a leg shield 169 to put the driver's foot on. A step cover side 170 continuous to the lower part of the side and a side cover 171 continuous to the step lower side 170 and covering the vehicle body rear part from both sides are provided.

On the side cover 171, the sheet | seat 172 which covers the storage box 160 and the fuel tank 161 so that opening and closing is possible from upper direction is provided.

Next, the operation of this embodiment will be described. An oil pump 66 for pumping oil from the oil reservoir 65 in the crankcase 35 is attached to the crankcase 35 of the engine main body 34. An oil supply passage 67 for guiding oil for lubricating the valve drive mechanism 52 is continuous to the oil pump 66 so that the crankcase 35, cylinder block 36, cylinder head 37 and head It is provided in the cover 38, and the temperature detector 73 is attached to the engine main body 34, with the detection element part 73a facing the oil supply passage 67. As shown in FIG.

By the way, the oil supply passage 67 which guides the oil discharged from the oil pump 66 to lubricate the valve drive mechanism 52 is filled with oil irrespective of the operation state and attitude as long as the engine is operated. As described above, the detection element portion 73a of the temperature detector 73 is disposed toward the oil supply passage 67 and always keeps the engine temperature without receiving a large change in the operating state and attitude of the engine E. It is possible to detect accurately and quickly, and also a complicated structure is not necessary to detect the oil temperature with the temperature detector 73.

In addition, since the oil supply passage 67 is disposed in the cylinder head 37 at a position closer to the intake port 47 than the exhaust port 48, the influence of heat radiation by the environment at the outer surface portion of the engine main body 34 is affected. The engine temperature can be detected satisfactorily even by low rotation (idling state) after the engine E is started, without receiving much, so that the engine temperature can be detected well and quickly.

The engine E is configured by forced air cooling so that the cooling blocks 36a ..., 37a ... for air cooling are installed in the cylinder block 36 and the cylinder head 37, and the temperature detector 73 has an air cooling fin. Since it is attached to the head cover 38, which is not provided, the engine temperature can be accurately detected without being disturbed by the cooling fins 36a, 37a, and the structure for attaching the temperature detector 73 is also simplified.

In addition, the motorcycle starter 111 which is energized and controlled in accordance with the detected value of the temperature detector 73 is connected to the vaporizer 108 connected to the intake port 47, so that the starting mixer passage 113 formed in the vaporizer 108 is provided. Since it is attached to open and close, according to the engine temperature detected by the temperature detector 73 correctly, the mixer supplied to the engine E at the time of starting can be optimized, and the warm-up performance of the engine E can be improved.

In addition, the cylinder block 36 and the cylinder head 37 cover the flow path 81 for distributing air for forced air cooling with the shroud 82 formed between the cylinder block 36 and the cylinder head 37. By attaching the temperature detector 73 to the head cover 38 so as not to be influenced by the forcibly blown cooling wind, it is possible to detect an accurate engine temperature while being a forced air cooling engine.

The upper side surface of the cylinder head 37 is provided with a flat attachment surface 97 which opens the intake port 47, and the inlet pipe 98 is fastened to the attachment surface 97 via an insulator 99. However, an opening 105 for fitting and positioning the insulator 99 is formed in the upper cover member 83 of the shroud 82.

Accordingly, the insulator 99 is positioned and held in the shroud 82 by being fitted into the opening 105, and the screw hole in which the insulator 99 is formed in the attachment surface 97 of the cylinder head 37 is held. Since the function of guiding the bolts 104... Which are screwed to the 103... Is performed, the fastening and tightening of the bolts 104... To the screw holes 103... .

In addition, since the vent hole 106 is formed between a part of the inner side surface of the opening 105 formed in the upper cover member 83 made of a synthetic resin and a part of the side surface of the insulator 99, the vent hole 106 is discharged from the vent hole 106. By warming the inflow pipe 98 with warm air, the warm-up performance can be improved. In addition, the mold portion for forming the opening portion 105 at the time of mold molding of the upper cover member 83 is relatively enlarged so as to include a portion corresponding to the vent hole 106 to increase the strength, thereby increasing the life of the mold. Can contribute to improvement.

In addition, since the thickness T of the insulator is set to be larger than the distance between the attachment surface 97 and the shroud 82, the insulator 99 is fitted to the opening 105 by being pressed against the attachment surface 97, The insulator 99 can be prevented from falling off the shroud 82 at the time of attachment, and the assemblability can be further improved.

By the way, the plug cap 121 connected to the spark plug 51 attached to the right side of the cylinder head 37 and the ignition coil 126 are connected via the high tension cord 123, but the ignition coil 126 is The other end of the high tension cord 123, which is supported at the rear frame pipe 30 on the right side so as to be located behind the cylinder head 37 and is continuously connected to the ignition coil 126, has a plug cap ( It is connected to this plug cap 121 by returning it to a substantially U shape from front to back than 121).

Therefore, the high tension cord 123 connected to the plug cap 121 extends from the plug cap 121 to the front side, and the plug cap 121 and the outer side of the plug cap 121 of the body frame 25. Even if the distance between the frame member disposed on the right side, that is, the rear frame pipe 30 on the right side is narrow, the degree of freedom in arranging the high tension cord 123 can be increased by avoiding interference with the vehicle body frame 25. At the same time, the bending radius of the high tension cord 123 may be set relatively large to improve durability of the high tension cord 123.

The shroud 82 has a pair of upper and lower upper and lower cover members 83 and 84 which are coupled to each other by cooperatively covering the cylinder block 36 and the cylinder head 37. The shroud 82 of the cylinder head 37 A fitting hole 120 for fitting the plug cap 121 connected to the spark plug 51 attached to the right side surface is formed between the fitting surfaces 86 of both cover members 83 and 84. In addition, the cover 122 which covers the fitting part of the plug cap 121 to the fitting hole 120 from upper part is integrally provided in the upper cover member 83, and the elastic force which acts from the high tension cord 123 is integrally provided. The plug cap 121, which is biased to one side around the axis of the spark plug 51, contacts the rotation stop positioning portion 122a formed in the lid 122 so as to receive the plug cap 121 against the elastic force. It is fitted.

That is, since the plug cap 121 is engaged with the rotation stop positioning portion 122a formed in the cover 122 in contact with the elastic force acting from the high tension cord 123, the plug cap 121 is ignited during engine operation. Rotation around the axis of the plug 51 can be prevented, whereby vibration of the high tension cord 123 can be prevented, and the high tension cord 123 can be effectively prevented from contacting other parts.

In addition, since the fitting portion of the plug cap 121 to the fitting hole 120 is covered from the upper side by the lid 122, the upper portion of the plug cap 121 touches the member, for example, the storage box 160, above the engine body 34. Dropping mud and the like can be prevented from adhering to the connection portion of the high tension cord 123 and the plug cap 121.

In addition, since the clamp 124 holding the high tension cord 123 is attached to the clamp attachment sheet 125 formed on the upper cover member 83 in succession to the lid 122, the high tension cord 123 is plugged. By keeping the cap 121 near, the vibration of the high tension cord 123 can be prevented more effectively, and the strength of the lid 122 can be increased by the sheet 125 with the clamp.

In addition, the upper cover member 83 of the shroud 82 has a pair of hooks protruding from the outer surface of the upper cover member 83 while facing each other with engaging projections 128a and 128a protruding toward the mutually adjacent sides. (128, 128) and a pair of connecting walls (129, 130) bulging from the outer surface of the upper cover member 83 to face each other while connecting between the two hooks (128, 128) are integrally installed, A rectangular quadrilateral through hole 131 is formed which is surrounded by these hooks 128 and 128 and connecting walls 129 and 130.

Cables 133 and tubes 134 stacked between the engaging projections 128a and 128a of both hooks 128 and 128 and the both connecting walls 129 and 130 and pressed between the hooks 128 and 128, respectively. ) Is gripped.

Therefore, when molding the upper cover member 83 made of synthetic resin, the pair of hooks 128 and 128 and the pair of connecting walls 129 and 130 are integrated in a simple mold structure without using a sliding mold. The cable 133 and the tube 134 can be connected to both the hooks 128 and 128 and the both connecting walls 129 and 130 without using parts other than the upper cover member 83 provided by the motorcycle. Can be stably supported, and stable support of the cable 133 and the tube 134 on the flat surface of the upper cover member 83 can be achieved while reducing the number of parts and the number of assembly work steps.

In addition, the transmission hole 131 is covered with the overlapping cable 133 and the tube 134, and in the state of supporting the cable 133 and the tube 134 in the upper cover member 83, that is, the shroud 82 ) Is not visible from the transmission hole 131.

That is, the permeation hole 131 is covered with the cables 133 and the tube 134 stacked on each other, and the cooling performance of the forced air-cooled engine E is stably prevented by preventing leakage of the cooling wind from the shroud 82. It is possible to support the cable 133 and the tube 134 to the shroud 82 while holding it, and also to prevent the leakage of the cooling wind from the transmission hole 131, so that the outer surface side of the shroud 82 It is possible to prevent deterioration of appearance by preventing dust from ejecting.

By the way, the cable 133 has a soft vinyl film and is continuous to the temperature detector 73, and the tube 134 is formed of a hard elastic material for guiding the bridger gas to cover the head cover ( 38), the vinyl film on the outer surface of the cable 133 is sufficiently adhered to both connecting walls 129 and 130, and the end of the hooks 128 and 128 are hooked to the outer surface of the tube 134. By making the fitting projections 128a and 128a securely engage, the cable 133 and the tube 134 can be supported more reliably.

In addition, the hook 128 has a plurality of locations spaced apart in the longitudinal direction of the cable portion 133 and the tube 134 and the substrate portion 128b in which the base end portion is continuous over the entire length of the upper cover member 83. For example, a plurality of, for example, two branch plate portions 128c and 128c are provided, which are continuously connected to the substrate portion 128b at two places and provided with the engaging projection portion 128a protruding from the front end portion. A reinforcing wall 132 for receiving the cable 133 between the two connecting walls 129 and 130 is provided between the two hooks 128 and 128 between the branch plates 128c and 128c.

For this reason, the cable 133 and the tube 134 can be supported more stably by accommodating the inner cable 133 even in the reinforcing wall 132, and both hooks 128 are supported by the reinforcing wall 132. , 128) can be increased.

As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, It is possible to make various design changes without deviating from this invention described in the claim.

As described above, according to the invention of claim 1, the oil supply passage for guiding oil discharged from the oil pump to lubricate the valve drive mechanism is filled with oil regardless of the operation state and attitude as long as the engine is operated. Since the detection element portion of the detector is disposed toward the oil supply passage and the oil supply passage is disposed near the intake port, it is largely influenced by the change in the operating state and attitude of the engine and the heat radiation by the environment at the engine outer surface portion. It is possible to detect the engine temperature satisfactorily even at low revolutions after starting the engine, to detect the engine temperature always well and quickly, and also to avoid the complicated structure of detecting the oil temperature with the temperature detector. not.

According to the invention of claim 2, in the air-cooled engine, by attaching the temperature detector to the head cover on which the cooling fin is not provided, the engine temperature can be detected accurately without disturbing the cooling fin, and the temperature detector is attached. The structure for doing so is also simplified.

According to the invention of claim 3, it is possible to optimize the mixer supplied to the engine at the start-up according to the engine temperature accurately detected by the temperature detector, and improve the engine's warm-up performance.

Moreover, according to invention of Claim 4, a temperature detector can be arrange | positioned in the position which is not influenced by the cooling wind forcibly blown, and an accurate engine temperature can be detected while being a forced air cooling engine.

Claims (4)

An oil pump for pumping oil from the oil reservoir 65 formed in the lower part of the crankcase 36 to the engine body 34 including the crankcase 35, the cylinder block 36, and the cylinder head 37. An oil supply passage 67, to which oil 66 is attached, for guiding oil for lubricating the valve drive mechanism 52, is continuous to the oil pump 66 and has at least a crankcase 35, a cylinder block 36. And the engine installed in the cylinder head 37, The oil supply passage 67 is disposed at the cylinder head 37 at a position closer to the intake port 47 than the exhaust port 48, and the temperature detector 73 moves the detection element portion 73a to the oil. The engine temperature detection apparatus in the engine characterized by being attached to the engine main body (34) toward the supply passage (67). The method of claim 1, The engine main body 34 in which the cooling fins 36a and 37a for air cooling are formed in the cylinder block 36 and the cylinder head 37 allows a part of the oil supply passage 67 to be installed so that the cylinder head 37 And a temperature cover (73) attached to the head cover (38), wherein the temperature cover (73) is attached to the head cover (38). The method of claim 1, The starter mixer passage 113 provided with the carburettor 108 connected to the intake port 47, wherein the motorcycle starter 111 is energized and controlled according to the detection value of the temperature detector 73. An engine temperature detection device for an engine, characterized in that attached to open and close. The method of claim 2, At least the cylinder block 36 and the cylinder head 37 of the engine main body 34 have a flow path 81 through which air for forced air cooling is passed between the cylinder block 36 and the cylinder head 38. It is covered with the shroud 82 to form, The engine temperature detection apparatus in the engine characterized by the above-mentioned.