ES2249086A1 - Engine temperature detecting device for engine - Google Patents

Abstract

Engine temperature sensing device for engines. Problem: Being able to detect the temperature of an engine always satisfactorily and quickly without being influenced easily by variations in the operating state and position of the engine as well as by heat discharge from the exterior surface of the engine due to environmental factors in an engine including an engine body, the engine body having a crankcase, a cylinder block, and a cylinder head, an oil pump for pumping oil from an oil storage section formed in the lower portion of said crankcase, the oil pump to the engine body, and an oil feed path for guiding oil to lubricate a valve mechanism provided at least in the cylinder block and cylinder head in communication with the oil pump. Solution means: The oil supply path 67 in the cylinder head 37 is arranged in the closest position to an intake port 47 than to an exhaust port 48, and the temperature sensor is attached to the engine body 34 with the detector element exposed in the oil feed path 67. (Machine-translation by Google Translate, not legally binding)

Description

Engine temperature detector device for engines

Detailed description of the invention Technical Field of the Invention

The present invention relates to an engine including a motor body, the motor body having a crankcase, a cylinder block, and a cylinder head, a pump of oil to pump oil from a storage section of oil formed in the lower portion of said crankcase, being attached the oil pump to the engine body, and a path of oil feed to guide oil to lubricate a mechanism Valve arranged at least in the cylinder block and cylinder head  of cylinder in communication with said oil pump.

Description of the related technique

So far, in a detection device of motor temperature described in JP-A-2000-213326, a temperature detector to detect the oil temperature in an oil return path formed in a block of cylinders to return oil from a cylinder head to an oil pan, is attached to the cylinder block, and a oil temperature sensing apparatus described in JP-B-2-22209 is adapted in such a way that oil is injected from a hole of specific injection into a detector unit of a sensor oil temperature attached to a cylinder head cover.

Problems to solve with the invention

However, in an apparatus described in JP-A-2000-213326 described above, since the temperature detector is arranged in the oil return path, and, in addition, the diameter of the oil return passage is set to a high value for guarantee a significant amount of return oil, the amount of oil that passes through it varies according to the state of engine operation As a consequence, it is difficult to detect the oil temperature always accurately, and the detection is susceptible to influences by surface heat discharge engine exterior due to environmental factors. Also, in the apparatus described in JP-B-2-22209 before described, since an oil feed path is complicated, and the amount of oil injected into a unit Detector of an oil temperature sensor may vary depending on variations in position and engine speed, it is difficult to detect the engine temperature when the engine is at a low speed (idle state after tear).

In view of such circumstances, an object of the  present invention is to provide a detector apparatus for engine temperature for an engine, which can detect the engine temperature always satisfactory and quickly in a simple construction without being easily influenced by variations in operating status and engine position as well as by heat discharge from the outer surface of the engine due to environmental factors

Means to solve the problems

To achieve the object described above, the invention according to claim 1 is an engine including a engine body, the engine body having a crankcase, a block of cylinders, and a cylinder head, an oil pump for pump oil from an oil storage section formed in the lower portion of said crankcase, the oil pump to the motor body, and a feed path of oil to introduce oil to lubricate a mechanism valve provided at least in the crankcase, the cylinder block, and the cylinder head in communication with said oil pump, characterized in that said oil feed path is disposed in said cylinder head in the position closest to an intake hole that to an exhaust hole, and a detector temperature is mounted on the motor body with an element detector that looks towards said feed path of oil.

In this arrangement, the feeding path of oil to introduce oil to be discharged from the oil pump To lubricate the valve mechanism, it is full of oil regardless of operating status and position while the engine is running, the detector element of the detector temperature is arranged looking at the feed path of oil, and, in addition, the oil feed path is arranged in the position closest to the intake hole. For the Therefore, the engine temperature can be detected satisfactorily even when the engine is at a low number of revolutions after starting, without being easily influenced due to variations in operating status and engine position as well as per heat discharge from the outer surface of the engine due to environmental factors, and thus the engine temperature it can always be detected satisfactorily and quickly, and also not no complex construction is needed to detect the oil temperature by the temperature detector.

The invention according to claim 2 is characterizes, in addition to the construction of the invention according to the claim 1, because the motor body has a fin of cooling for air cooling arranged in said block of cylinders (36) and the cylinder head (37) includes a cover of cylinder head that is connected to the cylinder head in such a way that part of said oil feed path be provided, and said temperature detector is attached to the cylinder head cover. In this arrangement, in the case of an air-cooled engine, attaching the temperature detector to the cylinder head cover that does not is provided with the cooling fin, the engine temperature can be detected accurately without disturbance by the cooling fin, and you can also simplify the construction to mount the temperature detector.

The invention according to claim 3 is characterizes, in addition to the construction of the invention according to the claim 1, because a carburetor to be connected to said hole of admission is provided with a starting device of motorcycle that is controlled by power based on values detected by said temperature detector to open and close a air-fuel starter mixing step provided in the carburetor. In this arrangement, the mixture of air-fuel to be supplied to the engine to starting the engine can be optimized based on the temperature of the motor accurately detected by the temperature detector, thereby improving the engine heating operation.

The invention according to claim 4 is characterizes, in addition to the construction of the invention according to the claim 2, because a step to allow air to flow to forced air cooling of said cylinder block and the cylinder head is covered with a shell assembly formed between the cylinder block and the cylinder head. In this arrangement, the temperature detector is arranged in the position that is not susceptible to receiving cooling air forced, so that the engine temperature can be detected with accuracy even if it is a forced air cooled engine.

Brief description of the drawings

Figure 1 is a side view of a scooter type motorcycle.

Figure 2 is a perspective view of the middle section of the scooter type motorcycle in a state in the that a vehicle body cover and a slide compartment.

Figure 3 is a cross-sectional view. enlarged taken along line 3-3 in the Figure 1.

Figure 4 is a drawing observed in the direction indicated by an arrow 4 in figure 3.

Figure 5 is a drawing observed in the direction indicated by an arrow 5 in figure 3.

Figure 6 is a cross-sectional view. taken along line 6-6 in the figure 3.

Figure 7 shows a cylinder head cover according to It is seen from one side of the cylinder head.

Figure 8 is a cross-sectional view. taken along line 8-8 in the figure 7.

Figure 9 is a cross-sectional view. enlarged taken along line 9-9 in the figure 6.

Figure 10 is a cross-sectional view. taken along line 10-10 in the figure 9.

Figure 11 is a cross-sectional view. taken along line 11-11 in the figure Four.

Figure 12 is a cross-sectional view. enlarged taken along line 12-12 in the figure 5.

Figure 13 is a cross-sectional view. taken along line 13-13 in the figure 5.

Figure 14 is a cross-sectional view. enlarged taken along line 14-14 in the figure 2.

Figure 15 is a cross-sectional view. taken along line 15-15 in the figure 14.

Figure 16 is a cross-sectional view. taken along line 16-16 in the figure 14.

Figure 17 is a cross-sectional view. taken along line 17-17 in the figure 14.

Reference numbers

3. 4: body of engine 35: sump 36: block of cylinders 36th, 37th: fin of cooling 37: stock cylinder 38: cover of butt

47: hole of admission 48: hole of escape 52: mechanism of valve 65: deposit of oil 66: bomb of oil 67: feed path of oil 73: detector of temperature 73a: element detector 81: tour of flow 82: wrapped up 108: carburetor 111: device motorcycle boot 113: step of air-fuel mixture of start.

Method of implementing the invention

A way of implementing this invention will be described based on an embodiment of the present invention shown in the accompanying drawings.

Figures 1 to 17 show an embodiment of the  present invention Figure 1 is a side view of a scooter type motorcycle; Figure 2 is a perspective view of the middle section of the scooter type motorcycle in a state in which omit a vehicle body cover and a slide compartment; Figure 3 is a sectional view enlarged transverse taken along the line 3-3 in figure 1; Figure 4 is a drawing observed in the direction indicated by an arrow 4 in figure 3; Figure 5 is a drawing observed in the direction indicated by a arrow 5 in figure 3; Figure 6 is a sectional view cross section taken along line 6-6 in the figure 3; Figure 7 shows a cylinder head cover as seen from one side of the cylinder head; Figure 8 is a view in cross section taken along the line 8-8 in Figure 7; Figure 9 is a view in enlarged cross section taken along the line 9-9 in Figure 6; Figure 10 is a view in cross section taken along the line 10-10 in Figure 9; Figure 11 is a view in cross section taken along the line 11-11 in Figure 4; Figure 12 is a view in enlarged cross section taken along the line 12-12 in Figure 5; Figure 13 is a view in cross section taken along the line 13-13 in Figure 5; Figure 14 is a view in enlarged cross section taken along the line 14-14 in Figure 2; Figure 15 is a view in cross section taken along the line 15-15 in Figure 14; Figure 16 is a view in cross section taken along the line 16-16 in Figure 14; Figure 17 is a view in cross section taken along the line 17-17 in figure 14.

With reference now to Figure 1 and Figure 2, a vehicle body frame 25 of a motorcycle type scooter includes a main frame tube 27 that has a tube front 26 attached at its front end, a cross tube 28 attached to the rear end of the main frame tube 27 in right angle, and rear frame tubes 29 and 30 as a pair of left and right rear frame elements whose ends front are connected to both ends of the cross tube 28, respectively.

The main frame tube 27 includes a descending frame 27a that tilts back and down of the front tube 26, and a lower frame 27b extending backward from the rear end of the descending frame 27a of substantially horizontal shape, both integrally formed each. The pair of left and right rear frame tubes 29 and 30 are integrally formed with rising frames 29a and 30a that extend backward and upward from both ends of said transverse tube 28, and upper frames 29b and 30b which is extend backward from the rear ends of the racks ascending 29a and 30a substantially horizontally and curved in a horizontal plane so that the holes in their rear ends look at each other.

A front fork 31 on a wheel front WF is supported in an airship by said front tube  26, and a steering handlebar 32 is connected to the end front fork upper 31.

In the front portions of both tubes of rear frame 29 and 30 of vehicle body frame 25, the front portion of a power unit P is supported by an articulated mechanism 33 so that it is capable of tilting vertical movement, and a rear wheel WR arranged in the right side of the rear portion of the power unit P is rotatably supports by the rear portion of the unit power P.

In Figures 3 to 6, the power unit P Includes a four-stroke single-cylinder engine cooled by forced air E to be placed forward of the rear wheel WR, and an uneven transmission M arranged between the engine E and said WR rear wheel.

An engine body 34 of the engine E including a crankcase 35, a block of cylinders 36 to be connected to crankcase 35, a cylinder head 37 to be connected to cylinder block 36 in the opposite side of the crankcase 35, and a cylinder head cover 38 to be connected to cylinder head 37 on the opposite side of the block cylinders 36, is disposed between both rear frame tubes 29 and 30 of the vehicle body frame 25, and the cylinder head cylinder 37 is disposed between the lower portions of the ascending frames 29a and 30a, which are the front portions of both rear frame tubes 29 and 30.

The cylinder block 36 is disposed of such so that an axis of a cylinder hole 39, which is formed in the cylinder block 36, ie a cylinder axis C, is oriented along the direction forward and backward of the motorcycle substantially horizontally with the side slightly higher front, and a combustion chamber is formed 41 between the cylinder head 37 and a piston 40, which fits slidingly in said cylinder hole 39. Piston 40 is connected to a crankshaft 44 that has a parallel rotation axis with the axis of rotation of the rear wheel WR by a connecting rod 42 and a doll 43.

The crankshaft 44 is rotatably supported by the crankcase 35 including a pair of crankcase sections 35a and 35b a join along a plane including said cylinder axis C and that extends orthogonally to crankshaft 44, and crankshaft 44 it is provided with a first ball bearing 45 between one of the crankcase elements 35a and crankshaft 44, and a second bearing of balls 46 between the other crankcase element 35b and the crankshaft 44.

The upper lateral surface of the cylinder head of cylinder 37 is formed with an intake hole 47 that can communicate with said combustion chamber 41, and the surface lower side of cylinder head 37 is formed with a exhaust port 48 that can communicate with said chamber of combustion 41. An intake valve 49 and an exhaust valve 50 to open and close the intake hole 47 and the intake hole exhaust 48 are arranged in cylinder head 37 so that are arranged substantially V-shaped in a drawing of projection projected on a plane orthogonal to the axis of rotation of the crankshaft 44, and are pushed by springs in the direction of closure of the intake hole 47 and the exhaust hole 48, respectively. A spark plug 51 exposed to the chamber of combustion 41 is attached to one of the side surfaces left and right of cylinder head 37, in this embodiment, on the right lateral surface when observed in The forward direction of the motorcycle.

A valve mechanism 52 for opening and closing said intake valve 49 and the exhaust valve 50 is housed between the cylinder head 37 and the cylinder head cover 38. The valve mechanism 52 includes a camshaft 55 which has a parallel axis with the crankshaft 44 and supported rotatably by cylinder head 37 and including a eccentric intake 53 and eccentric exhaust 54, and shafts oscillations of the intake side and exhaust side 56 and 57 which they have parallel axes with the camshaft 55 and supported by the cylinder head 37, with one arm swinging oscillating intake side 58 by the oscillating axis of side of intake 56 to operate the intake valve 49 in response to the operation of said intake eccentric 53, and being supported by tilting form an oscillating arm of exhaust side 59 along the shaft oscillating exhaust side 57 to open and close the valve exhaust 50 in response to the operation of said exhaust eccentric 54

A driven pinion 60 is fixed to one end. of the camshaft 55. On the other hand, a drive pinion 61 it is fixed to the crankshaft 44 in the position corresponding to said driven pinion 60, which is more outer than the second bearing of balls 46. An eccentric endless chain 62 is wound in the drive and driven sprockets 61 and 60, and the chain of eccentric 62 is accommodated in a storage chamber 63 formed through the cylinder block 36, the cylinder head 37, and the cylinder head cover 38 so as to be able to advance in her. The camshaft 55 is rotated by the pinion of drive 61, driven pinion 60, and eccentric chain 62 at half the crankshaft speed 44.

A drive gear 64 is fixed to the crankshaft 44 in the outermost position than the first bearing of balls 45, and an oil pump 66 to be mounted to the crankcase 35 for pump oil using a 79-section oil artichoke oil storage 65 formed in the lower portion of the crankcase 35, is moved by said motor gear 64.

Part of the oil pumped from the oil pump 66 is used to lubricate valve mechanism 52, and a oil feed path 67 to introduce oil from the oil pump 66 to valve mechanism 52 is arranged in the crankcase 35, cylinder block 36, cylinder head 37, and the cylinder head cover 38. In addition, in the cylinder head 37, the oil feed path 67 is arranged in the position closer to the intake hole 47 than the exhaust 48. In this embodiment, the feed path of oil 67 is arranged in the position that intersects the hole of admission 47 in a projection drawing on an orthogonal plane to the crankshaft 44.

With reference also to figure 7 and figure 8, an end located down said travel of Oil feed 67 includes a distribution slot 68 arranged on a bonded surface with respect to the cylinder head of cylinder head 37 of cylinder head cover 38 so that oil from cylinder head side 37 is supplied to one end, and a bottom distribution hole 69 arranged on the side wall of the cylinder head cover 38 so that it is in communication with the other end of the distribution slot 68. A injection hole 70 in communication with the end portion inside the distribution hole 69 on the inner surface of the side wall of the cylinder head cover 38 so that it is capable of injecting oil into the valve mechanism 52.

Cylinder head cover 38 is formed with a hole with bottom detection 71 communicating with one end of said distribution slot 68, and integrally with a projection of assembly 72 protruding outward from the outer surface of the cylinder head cover 38 in the position corresponding to the hole of detection 71. A temperature detector 73 is mounted on the mounting boss 72 to insert a detector element 73a into said detection hole 71. In other words, the detector of temperature 73 is attached to the cylinder head cover 38 of the body of motor 34 such that the detector element 73a is exposed to the oil feed path 67.

Paying attention to figure 3, a generator of  power 76 including a stator 74 to be fixed to the crankcase 35 and a outer rotor 75 fixed to crankshaft 44 so that it encloses the stator 74 is arranged in the outer position of said drive gear 64, and a fan 77 is fixed to the crankshaft 44 in the position outside the power generator 76. The fan 77 includes a plurality of sheets 77b, 77b, ... formed integrally on the outer periphery of a portion of base 77a, which is fixed to the outer rotor 75 of the generator power 76 with a plurality of bolts, for example, four, 78, 78, ...

At least the cylinder block 36 and the cylinder head  cylinder 37 of the motor body 34, in this embodiment, part of the crankcase 35, cylinder block 36, and cylinder head 37 are cover with a housing assembly 82, and air for cooling forced air discharged from the fan 77 flows in a path of flow 81 formed between the motor body 34 and the shell 82. In addition, a plurality of cooling fins 36a ..., 37a ... to allow effective cooling by cooling air that flows in said flow path 81 protrude from the surfaces external of the cylinder block 36 and the cylinder head 37.

Said envelope 82 includes a pair of elements of upper and lower cover 83 and 84 connected to each other to cover the cylinder block 36 and the cylinder head 37 in cooperation, and a fan cover 85 connected to both cover elements indicated 83 and 84 to cover part of the crankcase 35. The upper cover element 83, the element bottom cover 84, and fan cover 85 are formed of synthetic resin.

The upper cover element 83 is formed with a plurality of locking jaws 87 ... protruding from a coupling surface 86 with respect to the lower element of cover 84 towards the lower cover element 84, and the element lower deck 84 is provided with locking portions 88 ... to allow the elastic coupling of said jaws of lock 87 ... The upper and lower cover elements 83 and 84 are integrally formed with a plurality of fixed portions 89 ..., 90 ... that rest on each other on the surface of coupling 86, so that the fixed portions 89 ..., 90 ... that support one over another, are fixed to each other by an element threaded 91.

In this way, the cover elements upper and lower 83 and 84 are joined together by elastic coupling of locking jaws 87 ... with locking portions 88 ... and fixing the fixed portions 89 ..., 90 ... by the threaded elements 91 ..., and the cylinder head cover 38 protrudes forward of the upper and lower cover elements 83 and  84.

The fan cover 85 is fixed to the crankcase element 35a to cover the crankcase element 35a and the fan 77, which are part of the crankcase 35, and fixed to said upper and lower cover elements 83 and 84 by one plurality of threaded elements 92 ....

The fan cover 85 is provided with a suction cylinder 94 forming a suction hole 93 to draw air from outside towards said fan 77 so corresponding to the fan 77 outside of it, and the orifice of suction 93 is provided with a ventilation grill 95.

The vent 95 includes a plurality of ring portions, for example, five 95a to 95e arranged concentrically with the suction cylinder 94, and a plurality of connecting portions 95e ... that extend radially to connect the suction cylinder 94 and the respective ring portions 95a to 95d. A time stamp 96, for example, triangularly, to align the phase of the crankshaft 44 is indicated on the outer surface of the cover of fan 85 in the position corresponding to one of the portions  connection 95e ... Timing mark 96 is for regulate, for example, the ignition timing, and is capable of easily align the ignition timing phase by aligning one of a plurality of bolts, for example, four 78 ... for fix the fan 77 to the crankshaft 44 with the connecting portion 95e aligned with timing mark 96 outside said ventilation grill 95.

Timing mark 96 can be used not only to regulate the ignition timing, but also to regulate the timing of TDC and BDC. In addition, when the mechanism valve 52 is constructed in such a way that the operational characteristic of at least one of the intake valve 49 and the exhaust valve 50, said timing mark 96 is can use to regulate the timing of change of the operational characteristic

With reference also to figure 9 and figure 10, a flat mounting surface 97 that has a hole for the intake hole 47 is formed on the lateral surface of the upper portion of cylinder head 37, and the end located down an intake tube 98 is fixed to the surface Mounting 97 by insulator 99.

The downward end of the tube admission 98 is formed with a tab 98a integral with it, and the insulator 99 which has an intake hole 100 that communicates with the intake hole 47 and said mounting surface 97 are formed so that they have settings corresponding to that tab 98a.

Watertight joints 101 and 102 surrounding said intake hole 100 are connected endlessly on both surfaces of the insulator 99, and one of the seals 101 is interposed between the insulator 99 and the mounting surface 97, and the gasket airtight 102 is interposed between the insulator 99 and said flange 98a. In addition, the thickness T of the insulator 99 is determined so that is larger than the distance S between the surface of assembly 97 and the upper cover element 83 of the shell 82.

Threaded holes with bottom 103 and 103 are formed on mounting surface 97 on both sides of the hole intake 47, and bolts 104 and 104 inserted in tab 98a and the insulator 99 are threaded into said threaded holes 103 and 103, so that the intake tube 98 is fixed to the surface mounting 97 by insulator 99 fixing bolts 104 and 104.

\hbox{aislante
99.}

The upper cover element 83 of the shell 82 covering the cylinder head 37 is formed with a hole 105 to adjust and place said insulator 99. The hole 105, as shown in Figure 10, is larger than the insulator 99 , and an air discharge orifice 106 for discharging cooling air flowing through the flow path 81 outwardly is formed between part of the side surface of the hole 105 and part of the side surface of the

 \ hbox {insulator
99.} 

The upper end of said intake tube 98 is connected to the downward end of a carburetor 108 arranged behind the intake tube 98 by means of a hose connection 107, and the upward end of carburetor 108 is connected to an air filter 110 disposed on the side left of the rear wheel WR via a connecting tube 109.

In Figure 11, carburetor 108 is provided of a motorcycle starter 111 controlled by power based on the detected values of said detector of temperature 73, and motorcycle starter 111 is mounted on a carburetor body 112 to open and close the midpoint of a mixing step of starter air-fuel 113 arranged in the carburetor body 112 carburetor 108 to put in bypass a regulating valve (not shown) arranged in the carburetor 108.

A bleeding tube 114 is attached to the body of carburetor 112 interposed in the upward position of the motorcycle starter 111 in said mixing step air-fuel starter 113, and a nozzle of fuel 115, which has the lower portion of the tube of bleeding 114 submerged in its upper portion, is fixed to the lower portion of carburetor body 112. A tank of fuel 116 to store fuel is fixed to the portion lower carburetor body 112, and the lower portion of said fuel nozzle 115 is immersed in fuel in the fuel tank 116.

The motorcycle starter 111 includes a needle valve 118 retractablely inserted into a nozzle 117 disposed at a midpoint of the mixing step of starter air-fuel 113 in position down the bleeding tube 114, and the valve position of  needle 118 in the nozzle 117 is determined by the control of motorcycle boot device power 111, so which determines the amount of mixture of air-fuel starter flowing in the passage of air-fuel starter mixture 113.

A coupling surface 86 between the upper and lower cover elements 83 and 84 that constitute part of the shell 82 is formed with a lace hole 120. By therefore, a plug plug 121 connected to the spark plug 51 includes a tab 121a that rests on the outer surface of the upper and lower cover elements 83 and 84 around of the lace hole 120, and is embedded in said hole of lace 101.

An appendix 122 to cover the portion where the plug 121 fits into the hole 120 from above, integrally forms in the upper cover element 83 out of the upper and lower cover elements 83 and 84, and as depicted in Figure 12, Appendix 122 is formed in its distal end with a stop positioning element of whirlwind 122a to prevent the plug 121 from turning around the spark plug shaft 51 letting the plug Shutter 121 support and hook with it.

Said appendix 122 is formed so as to cover the portion where the plug 121, which assumes a position to extend at least a portion of a high voltage cable 123 connected to the sealing plug 121 forward of the sealing plug 121, is embedded in the lace hole 120 from above, and a vortex stop positioning element 122a is formed in the appendix 122 to receive the plug 121, which is pushed by an elastic force exerted by the high tension cable 123 in a direction around the spark plug shaft 51, against said elastic force.

With reference also to figure 13, the upper cover element 83 is integrally formed with a jaw mounting seat 125 which continues from said appendix 122, and the high voltage cable 123 which continues from said plug shutter 121 is held by a clamp 124 attached elastically to the jaw mounting seat 125.

The motor body 34 is supported by the frame of vehicle body 25 such that its cylinder head cylinder 37 is disposed between the lower portions of front racks 29a and 30a of the pair of tubes left and right rear frame 29 and 30. Said sealing plug 121 is also disposed between the lower portions of both ascending frames 29a and 30a, and an ignition coil 126 is supports above the right ascending frame 30a, which is one of both ascending frames 29a and 30a, as clearly shown in figure 2.

Therefore, the other end of the high cable voltage 123, which is connected to ignition coil 126 in a end, it curves substantially U-shaped in the position forward of said plug 121, which engages the Whirlpool stop positioning element 122a, back and It is connected to plug 121.

With reference also to figures 14 to 17, the upper cover element 83 of the shell 82 is formed integrally with a pair of hooks 128 and 128, which have protrusions hook 128a and 128a protruding towards each other at its end distal, and rise from the outer surface of the upper element of deck 83 so that they look at each other, and a couple of walls of connection 129 and 130 rising from the outer surface of the upper cover element 83 so that they look at each other and connect both hooks indicated 128 and 128, so that the hooks 128 and 128 and connecting walls 129 and 130 define a rectangular through hole 131.

A plurality of flexible elongated parts that they are stacked on top of each other and push between the two indicated hooks 128 and 128 are fixed between the engagement protrusions 128a and 128a of both hooks 128 and 128 and both connecting walls indicated 129 and 130. In this embodiment, a cable 133, which is a part elongated flexible interior received by both connection walls 129 and 130, and a tube 134, which is an elongated outer part flexible with the outer surface of both hitch projections indicated 128a and 128a come into contact, are fixed between the hitch projections 128a and 128a and both connection walls 129 and 130.

Said cable 133 includes a vinyl film soft and continues to temperature detector 73, and said tube 134 made of elastic hard material is connected to the cover of cylinder head 38 to introduce breathing gas.

In addition, said hook 128 includes a portion of base 128b, whose proximal end is connected to the upper element of cover 83 along its entire length, and a plurality, for example, two, forked plates 128c and 128c connected to said base portion 128b in a plurality of points, for example, in two points, at a longitudinal distance of the cable 133 and the tube 134 and formed with the engagement protrusions 128a so that protrude from its distal end. A wall of reinforcement 132 to receive the cable 133 between both walls of connection 129 and 130 between the bifurcated plates 128c and 128c of so that it extends between both hooks 128 and 128.

The exhaust pipe 118 is connected to the lower side surface of cylinder head 37, which is not covers with said envelope 82, such that the end located upwards continue from the exhaust hole 48, and the end located down the exhaust pipe 118 is connected to the exhaust muffler 119 arranged on the right side of the wheel rear WR.

Paying special attention to figure 3 and the Figure 4, a transmission case 136 extending towards the left of the rear wheel WR when viewed in the direction of advance of the motorcycle, is connected to the crankcase 35. The box Transmission 136 includes a crankcase body 137 formed integrally, and extending backwards from, the element of crankcase 35b of said crankcase 35, a left side cover 138 which forms a first transmission chamber 140 with the body of crankcase 137 and fixed to crankcase 137 from the side left, and a right side cover 139 that forms a second transmission chamber 141 with said crankcase body 137 and fixed to the right rear portion of the crankcase body 137.

A support arm 142 protrudes from the portion front of the crankcase body 137 of the transmission case 136 of so that it is placed on the side of the cylinder block 36 of the E motor, and support arm 142 is swingably supported by the vehicle body frame 25 by the mechanism articulated 33.

An axle 143 of the rear wheel WR is supported rotatably by the rear portion of the crankcase body 137 of the transmission case 136 and the right side cover 139. As shown in figure 1, a rear shock absorber 144 is disposed between the rear portion of the crankcase body 137 and the upper frame 29b of the rear frame tube 29 of the frame of vehicle body 25.

The non-epedic transmission M is of the belt type in V housed in the first transmission chamber 140, and a train of reduction gears 145 is disposed between the mechanism of non-ethereal transmission M and axis 143.

The non-epheptic transmission mechanism M includes a drive drive pulley 146 connected to the end of the crankshaft 44 out of the second ball bearing 46, a driven drive pulley 149 mounted on a driven shaft 147 which has a parallel shaft with crankshaft 44 and supported rotatably by the rear portion of the crankcase body 137 and the right side cover 139 by a centrifugal clutch 148, and an endless belt in V 150 placed around both pulleys of transmission 146 and 149.

Drive pulley 146 includes a fixed pulley half 146a to be fixed to the crankshaft 44 and a movable pulley half 146b one axially sliding to the crankshaft 44. A V-shaped annular groove 151 has been formed between both pulley halves 146a and 146b, and the V-belt 150 is enters the annular groove 151. A ramp plate 152 is attached to the crankshaft 44 behind the movable pulley half 146b, and a plurality of counterweight rollers 153 is housed between half of  mobile pulley 146b and ramp plate 152 in a floating state. Therefore, when the crankshaft speed increases 44, the counterweight rollers 153 receiving a centrifugal force move radially out of the crankshaft 44 to move the movable pulley half 146b towards the fixed pulley half 146a. By consequently, increases the contact radius of the V-belt 150 with both pulley halves 146a and 146b.

Moreover, the driven drive pulley 149 includes a support cylinder 154 connected to the driven shaft 147 via centrifugal clutch 148 and rotatably supported by driven shaft 147, a fixed pulley half 149a formed integrally with the support cylinder 154, and a half pulley mobile 149b rotatably supported by support cylinder 154 so that it can approach and move away from the fixed pulley half 149a and pushed towards the middle of fixed pulley 149a by a spring, and the V-belt 150 is inserted into a V-shaped annular groove 155 formed by both pulley halves 149a and 149b. Thus, movable pulley half 149b moves axially to reduce the contact radius of the V-belt 150 with respect to the pulley driven transmission 149 with an increase in the contact radius of the V-belt 150 with respect to the transmission pulley of drive 146, so that the non-ethereal transmission corresponding to the crankshaft revolution 44 is carried out between the crankshaft 44 and the driven shaft 147.

A starter shaft 156 is rotatably supported. on the left side cover 138 of the transmission case 136, and a starter pedal 157 (see Figure 1) is arranged at the outer end of the starter shaft 156. A device of start of pedal type 158, which can be transmitted to crankshaft 44 the power of the starter shaft 156 corresponding to the starter pedal drive 157, is arranged on the side inside said left side cover 138 between the axis of starter 156 and crankshaft 44.

A reduction gear train 145 is disposed between driven shaft 147 and shaft 143 and housed in the second transmission chamber 141, and the rotary power of the shaft powered 147 on the non-epedic transmission M is reduced by the train of reduction gears 145 and transmits to wheel axle 143 rear WR.

A slide compartment 160 in which You can store a helmet or the like, it is supported between the portions front of both rear frame tubes 29 and 30 of the frame of vehicle body 25 so that it is placed in front of said engine E, and a fuel tank 161 is supported between the rear portions of the rear frame tubes 29 and 30

A secondary air filter 162 to purify the secondary air supplied to the exhaust port 48 of the engine E is supported on the front portion of the upper frame 29b of the left rear frame tube 29 of the frame tubes rear 29 and 30. The downward end of a pipe intake 163 is connected to the intake hole of the filter secondary air 162, and the upward end of the tube of intake 163 is inserted into the rear end portion of the upper frame 30b of tube right frame 30 of tubes of rear frame 29 and 30.

A secondary air control valve 164 disposed between the engine E and the secondary air filter 162 is supports by a support 165 in the upper portion of the frame upward 29a of the left rear frame tube 29.

A connection pipe 166 in communication with the interior of the ascending frame 29a is arranged in the portion bottom of the ascending frame 29a of the left frame tube rear 29, and a conduit 167 to introduce cooling air since the non-ethereal transmission M of the power unit P is connected to said connecting tube 166.

The vehicle body frame 25 is covered  with a resin 168 vehicle body cover synthetic, and vehicle body cover 168 includes a leg guard 169 to cover the legs of the front occupant, a footrest floor 170 that continues from the portion lower leg guard 169 to put the legs of the driver, and side covers 171 that continue from the ground footrest 170 to cover the rear portion of the body of vehicle on both sides.

The lateral cover 171 is provided with a seat 172 covering the slide compartment 160 and the fuel tank 161 above so that you can open and close.

The operation of The present embodiment. The oil pump 66 for pumping oil from the oil tank 65 in the crankcase 35 it is mounted on the crankcase 35 of the motor body 34, and the feed path of oil 67 to introduce oil to lubricate the valve 52 is formed in the crankcase 35, the cylinder block 36, the cylinder head 37, and cylinder head cover 38 continuously from oil pump 66. Temperature detector 73 is mounted on the motor body 34 with the detector element 73a exposed to the oil feed path 67.

The oil feed path 67 for introduce oil pumped by oil pump 66 to lubricate the valve mechanism 52 is filled with oil independently of operating status and position while the engine is working As described above, placing the detector element 73a of temperature detector 73 exposed to oil feed travel 67, engine temperature is you can always detect accurately and quickly while minimizes the influences of variations in operating status and the position of the engine E, and in addition, a construction is not necessary complex to detect the oil temperature by the detector temperature 73.

In addition, since the feeding path of oil 67 is arranged in the position closest to the hole intake 47 that the exhaust hole 48 in the cylinder head cylinder 37, engine temperature can be detected satisfactory and quickly allowing satisfactory detection of engine temperature even at low revolutions (state in empty) after starting engine E while minimizing heat discharge influences from the outer surface of the motor body 34 due to environmental factors.

The E engine is built in a system of forced air cooling providing cooling fins 36a ..., 37a ... to cool by cooling air in the block cylinders 36 and cylinder head 37, and the detector temperature 73 is attached to the cylinder head cover 38, which is not provided with air cooling fins. Therefore, the Engine temperature can be detected accurately without being disturbed by the cooling fins 36a .... 37th ... and it can also simplify the construction to mount the detector of temperature 73.

Since the boot device of motorcycle 111, which is controlled by power based on values  detected from the temperature detector 73, is mounted on the carburetor 108 connected to the intake hole 47 to open and close the air-fuel mixture step of starter 113 arranged in carburetor 108, the mixture of air-fuel supplied to the engine E at the same time Startup can be optimized based on engine temperature accurately detected by temperature detector 73, so that the engine heating operation can be improved AND.

In addition, the cylinder block 36 and the cylinder head cylinder 37 are covered with casing 82 which has a step 81 to allow air to flow through forced air cooling, formed between the cylinder block 36 and the cylinder head 37, and the temperature detector 73 is attached to the cylinder head cover 38 so that it is not influenced by cooling air that flow forced. Therefore, the engine temperature is can accurately detect even a motor cooled by forced air.

The lateral surface of the upper portion of cylinder head 37 is formed with the flat surface of assembly 97 having a hole for the intake hole 47, and the intake tube 98 is fixed to the mounting surface 97 with the insulator 99 interposed in between, while the element top cover 83 of the shell 82 is formed with the hole 105 to adjust and position the insulator 99.

Therefore, since insulator 99 is placed in the envelope 82 fitting it in the hole 105, and in addition, the Insulator 99 has a function to guide bolts 104 ... to hook into threaded holes 103 ... formed on the surface  assembly 97 of cylinder head 37, the coupling is facilitated and tighten bolts 104 ... into threaded holes 103 ..., thereby increasing the appropriate assembly.

Given the air discharge hole 106,  between part of the inner surface of the hole 105 formed in the upper cover element 83 of synthetic resin and part of the side surface of insulator 99, operation can be improved heating by heating the intake pipe 98 by air tempered discharged from the air discharge hole 106. In addition, increasing the size of the die relatively to form the hole 105 used to mold the upper cover element 83 so that it includes the portion corresponding to said orifice of air discharge 106 to improve die strength, se contributes to prolong the life of the die.

Since the thickness T of the insulator is set to a value greater than the distance between mounting surface 97 and the shell 82, fitting the insulator 99 in the hole 105 of so that it is pressed against the mounting surface 97, it can be prevent the insulator 99 from falling from the shell 82 when carrying out the assembly, and thus the appropriate assembly can be further improved.

Although the plug 121 connected to the spark plug 51 mounted on the right side of the cylinder head cylinder 37 and ignition coil 126 are connected by the high voltage cable 123, the ignition coil 126 is supports by the right rear frame tube 30 in position back of cylinder head 37, and the other end of said high voltage cable 123, which is connected to the coil of On 126 at one end, it curves substantially U-shaped in the forward position of the plug 121 backwards and connects to the plug 121.

Therefore, the high voltage cable 123 connected to the sealing plug 121 extends forward of the sealing plug 121, and thus preventing it from interfering with the frame of vehicle body 25 even when the distance is short between the plug 121 and the frame element of the frame of vehicle body 25 arranged outside the plug 121, that is, the right rear frame tube 30, which can increase the flexibility of high cable placement voltage 123. In addition, setting the radius of curvature of the cable from high voltage 123 to a relatively large value, you can improve the durability of the high voltage cable 123.

Envelope 82 includes the pair of elements of upper and lower cover 83 and 84 joined together to cover the cylinder block 36 and the cylinder head 37 in shape cooperating, and the lace hole 120 to receive the plug shutter 121, which is connected to spark plug 51 a mount on the right surface of cylinder head 37, it shape on the coupling surface 86 between both elements of cover 83 and 84. In addition, the upper cover element 83 is form integrally with appendix 122 to cover the portion of plug stopper plug 121 into socket hole 120 from above, and contact and hook the stop positioning element of whirlwind 122a formed in appendix 122 to receive the plug shutter 121, which is pushed by an elastic force exerted by the high voltage cable 123 in a direction around the axis of the spark plug 51, against said elastic force.

In other words, since the plug stopper 121 contacts and engages with the stop positioning element Whirlwind 122a formed in Appendix 122 by an elastic force exerted by the high voltage cable 123, the plug 121 turn around the spark plug shaft 51 when the engine is running, so it can be avoided vibrations of the high voltage cable 123. Consequently, it can effectively prevent the high voltage cable 123 from Get in touch with other components.

In addition, the plug portion of the plug 121 in the lace hole 120 is covered by Appendix 122 from above, you can prevent the connecting portion of the cable from high voltage 123 and plug plug 121 become contaminated with mud, water or analogs that splash after hitting the element located upstream of the motor body 34, for example, the slide compartment 160.

Since the clamp 124 to hold the cable High tension 123 is attached to the clamp mounting seat 125 formed in the upper cover element 83 so that continue from appendix 122, high voltage cable 123 is can keep close to plug 121 to avoid effectively that the high voltage cable 123 vibrates, and the resistance of Appendix 122 can be increased by the seat of clamp assembly 125.

The upper cover element 83 of the wrapped 82 is integrally formed at its distal end with the pair of hooks 128 and 128 that have hook protrusions 128a and 128a that protrude towards each other and rise from the outer surface of the upper cover element 83 so that they face one towards another, and the pair of connecting walls 129 and 130 that rise from the outer surface of the upper cover element 83 so that look at each other and connect both hooks 128 and 128, so than hooks 128 and 128 and connecting walls 129 and 130 define the rectangular through hole 131.

The cable 133 and the tube 134 that stack one over another and push between both hooks 128 and 128 are fixed between the hook protrusions 128a and 128a of both hooks 128 and 128 and both connecting walls indicated 129 and 130.

Therefore, when molding the upper element of cover 83 made of synthetic resin, the pair of hooks 128 and 128 and the pair of connecting walls 129 and 130 can be formed integrally with a simple die structure without using a sliding die, and thus the cable 133 and the tube 134 can be stably support both hooks 128 and 128 and both walls connection 129 and 130 without using any part other than upper cover element 83 arranged on the motorcycle. By therefore, the stable support of the cable 133 and the tube is enabled 134 on the flat surface of the upper cover element 83, while reducing the number of components and the number of assembly steps

In addition, since the through hole 131 is cover with cable 133 and tube 134 stacked one on top of the other, the interior of the upper cover element 83, that is, the interior of envelope 82, it cannot be seen through said through hole 131 in a state where cable 133 and tube are supported 134

In other words, through hole 131 is cover with cable 133 and tube 134 stacked one on top of the other, and thus the cable 133 and the tube 134 can be supported by the sheath 82 while maintaining the cooling performance of the forced air cooled engine E in a stable state preventing the escape of cooling air from the housing 82. In addition, since the escape of cooling air can be prevented of the through hole 131 and thus no powder is injected to the side outside of envelope 82, deterioration of the appearance.

Said cable 133 includes a vinyl film soft and continues to temperature detector 73, and said tube 134 made of hard elastic material is connected to the cover of cylinder head 38 to introduce breather gas. Cable 133 and the tube 134 can also be reliably supported by setting the film Vinyl outside cable 133 in intimate contact with both walls of connection 129 and 130 and putting the engagement projections 128a and 128a at the distal ends of both hooks 128 and 128 in reliable engagement with the outer surface of the tube 134.

In addition, said hook 128 includes the portion of base 128b, whose proximal end is connected to the upper element of cover 83 along its entire length, and a plurality, for example, two forked plates 128c and 128c connected to said base portion 128b at multiple points, for example, at two points, at a longitudinal distance of the cable 133 and the tube 134 and formed with said engagement protrusions 128a so that protrude from its distal end. The reinforcement wall 132 for receiving the cable 133 between both connection walls 129 and 130 is forms between the bifurcated plates 128c and 128c so that it extend between both hooks 128 and 128.

Therefore, the cable 133 on the inner side is  it can also receive by the reinforcing wall 132, so that the cable 133 and tube 134 can be more stably supported, and the resistance of both hooks 128 and 128 can be increased by the reinforcement wall 132.

Although the embodiment of the present invention is described so far, the present invention is not limited to said embodiment, and several design modifications can be made without departing from the invention set forth in the claims attached.

Advantages of the invention

As described above, according to the invention set forth in claim 1, a path of oil feed to introduce oil to discharge from a Oil pump to lubricate a valve mechanism, is full of  oil regardless of operating status and position while an engine is running, a detector element of a temperature detector is arranged facing the path oil feed, and also the feed path of oil is arranged in the position closest to a hole of admission. Therefore, the engine temperature can be successfully detected even when the engine is at a low speed after starting, without remaining easily influenced by variations in operating status and engine position as well as heat discharge from the outer surface of the engine due to environmental factors, and so the engine temperature can always be detected satisfactorily and quickly, and additionally, no complex construction to detect oil temperature by a  temperature detector

According to the invention set forth in the claim. 2, in the case of an air-cooled engine, joining the temperature detector to a cylinder head cover that is not provided with a cooling fin, the engine temperature is can detect accurately without being disturbed by a fin cooling, and you can simplify, in addition, the construction for Mount the temperature detector.

According to the invention set forth in the claim. 3, you can optimize a mix of air-fuel to be supplied to the engine to start the engine based on the engine temperature detected with precision by the temperature detector, thereby improving the engine heating operation.

According to the invention set forth in the claim. 4, the temperature detector is arranged in the position that does not it is susceptible to the forced cooling air supplied, so the engine temperature can be detected accurately even if it is a forced air cooled engine.

Claims (4)

1. In an engine including: a motor body; the engine body (34) having a crankcase (35), a cylinder block (36), and a cylinder head (37); an oil pump (66) for pumping oil from an oil storage section (65) formed in the lower portion of said crankcase (36); the oil pump being attached to the engine body; and an oil feed path (67) for introducing oil to lubricate a valve mechanism (52) provided at least in the crankcase (35), the cylinder block (36), and the cylinder head (37) in communication with said oil pump (66), an engine temperature sensing apparatus for an engine, characterized in that said oil feed path (67) is disposed in said cylinder head (37) in the position closest to an orifice of intake (47) that to an exhaust orifice (48), and a temperature detector (73) is mounted on the engine body (34) with a detector element (73a) that looks towards said oil feed path (67 ). 2. An engine temperature sensing apparatus for an engine according to claim 1, characterized in that the motor body (34) having cooling fins (36a, 37a) for air cooling arranged in said cylinder block (36) and the cylinder head (37) includes a cylinder head cover (38) that is connected to the cylinder head (37) such that part of said oil feed path (67), and said temperature detector (73) are obtained ) is attached to the cylinder head cover (38). 3. An engine temperature sensing apparatus for an engine according to claim 1, characterized in that a carburetor (108) to be connected to said intake port (47) is provided with a motorcycle starting device (111) which is controlled by power based on the values detected by said temperature detector (73) to open and close a step of starting air-fuel mixture (113) arranged in the carburetor (108). 4. An engine temperature sensing apparatus for an engine according to claim 2, characterized in that at least said cylinder block (36) and the cylinder head (37) outside said motor body (34) are covered with an assembly of housing (82) having a passage (81) to allow air for forced air cooling to flow therein, formed between the cylinder block (36) and the cylinder head (37).