KR100267073B1 - Fluid pump structure in internal combustion engine - Google Patents

Abstract

The present invention relates to a high-sealing fluid pump structure installed in an internal combustion engine, wherein the internal combustion engine body (4) is fixedly mounted with a self-permeable cooling water pump casing (9), and has an overhead valve type 4-stroke short-cylinder internal combustion engine ( The driven sprocket 71, which is driven in rotation in conjunction with the operation of 1), is loosely inserted into the outer circumference of the rotor housing 63 of the coolant pump casing 9 and abuts the outer circumference of the opening of the coolant pump casing 9. The casing of the coolant pump 73 is constituted by the partition member 7 and the rotor housing 63 of the coolant pump casing 9, and the impeller 67 and the pump rotation shaft 66 are rotatably supported in the casing. A plurality of pairs of permanent magnets 68 and 72 arranged alternately in the circumferential direction alternately between the N and S poles are integrally disposed on the outer circumferential surface of the impeller 67 and the inner circumferential surface of the driven sprocket 71.

Description

Fluid pump structure in internal combustion engine

The present invention relates to a high-sealing fluid pump structure, particularly a coolant pump, installed in an internal combustion engine.

The coolant pump or the lubricating oil pump attached to the internal combustion engine is configured separately from the internal combustion engine main body, and the pump driving shaft is mainly installed in the crankcase, and the gear or sprocket mounted on the pump driving shaft is connected to the crank shaft of the internal combustion engine. (See, for example, JP 56-28209).

In addition, the cooling water pump and the radiator are provided separately from the internal combustion engine, and the cooling water pump, the radiator and the internal combustion engine are connected by a flexible tube such as a hose to form a cooling water circulation circuit.

In the above-described conventional fluid pump, since the pump drive shaft passes through the pump casing, it is necessary to arrange the mechanical seal so that the fluid in the pump casing does not leak to the outside through the rotation support portion of the pump drive shaft.

When the mechanical seal is disposed, the pump drive shaft is lengthened to secure the seal, the number of parts and the number of processing steps are increased, frictional power loss occurs at the seal portion, and when the fluid is coolant, it is slightly damaged by wear and aging. If the leakage occurs, the drain passage should be provided outside.

In addition, the internal combustion engine including the radiator separately increases the number of parts, increases the cost, not only makes the connection work and the maintenance of the flexible pipe complicated, but also increases the size of the internal combustion engine and its entire equipment. Could not be avoided.

1 is a left side view of an internal combustion engine according to an embodiment of the present invention.

2 is a right side view of FIG.

3 is a longitudinal plan view taken along line III-III of FIG.

4 is a longitudinal sectional view taken along line IV-IV of FIG.

5 is a view from the V-V of FIG.

6 is a right side view of the internal combustion engine body of the internal combustion engine shown in FIG.

FIG. 7 is a transverse rear view taken along line Vll-VII in FIGS. 1, 2, 4, and 5; FIG.

FIG. 8 is a cross sectional view taken along the lines VIII-VIII of FIGS. 1, 2, 4 and 5; FIG.

FIG. 9 is a view from IX-IX of FIG. 8. FIG.

FIG. 10 is a view from X-X of FIG.

FIG. 11 is a view seen from XI-XI of FIG. 3, and when the left cover member 8 is repeatedly attached to the partition member 7 of FIG. 10, the state shown in FIG.

12 is a view seen from XII-XII in FIG.

13 is a longitudinal plan view of another embodiment of the present invention.

FIG. 14 is a view from XIV-XIV of FIG. 13. FIG.

15 is a longitudinal sectional view of another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: 4-stroke single-cylinder internal combustion engine with overhead valve

2: left crankcase 3: right crankcase

4: internal combustion engine body 5: head cover

6: right cover member 7: partition member (or hermetic member)

8: left cover member

9: cooling water pump casing (or hollow protrusion member with magnetic permeable bottom)

10: cylinder hole 11: piston

12: left crankshaft 13: right crankshaft

14 bearing 15 crank pin

16: piston pin 17: connecting rod

18: intake port 19: exhaust port

20: intake pipe 21: carburetor

22: intake valve 23: exhaust valve

24: copper valve device 25: bearing

26: cam shaft 27: intake cam

28: exhaust cam 29: valve spring

30 valve spring retainer 31 valve lifter

32: drive sprocket 33: driven sprocket

34: Ungrouped 35: Idler Sprockets

36: Before ignition 37: Water jacket

38: cooling water inlet passage 39: cooling water discharge passage

40: cooling water absorption path 41: heat dissipation fin

42: portion 43: heat dissipation fin

44: heat absorbing groove portion 45: heat dissipation fin

46: passage pin radiator portion 47: ring-shaped protrusion

48: communication hole 49: bolt

50: swirl discharge part 51: impeller housing part

52: arc shape suction hole 53:

54: part 55: communication hole

56: heat absorbing fin 57: heat dissipation fin

58: suction 凹 59: heat absorbing fin

60: cooling water injection portion 61: communication hole

62: heat radiation fin 63: rotor housing

64: pivot blind hole

65: pivot blind hole 66: pump rotation shaft (or impeller rotation shaft)

67 impeller 68 permanent magnet

69: bearing fitting part 70: bearing

71: Driven sprocket (or drive rotating body) 72: Permanent magnet

73: coolant pump 74: starter driven sprocket

75: starter motor 76: unmanned

77: lubricant pump 78: generator

79: fin radiator portion 80: fin radiator portion

81: crankshaft 82: drive sprocket

83: rotation axis 84: driven sprocket

85: non-member 86: tubular body

The present invention relates to an improvement in a fluid pump structure and a cooling structure in an internal combustion engine that overcomes such a difficulty. In the fluid pump disposed in an internal combustion engine, a hollow protrusion member having a magnetically permeable bottom in the body of the internal combustion engine is provided. A sealed structure which is fixed and loosely inserted into the outer circumference of the bottomed hollow protruding member rotatably driven in conjunction with the operation of the internal combustion engine, and abuts against the opening outer periphery of the bottomed hollow protruding member; A casing of the fluid pump is constituted by the bottomed vaporizing protrusion member, and an impeller and an impeller rotating shaft are rotatably supported in the casing of the fluid pump so as to be concentric with the driving rotor, and alternately N, S poles. A plurality of pairs of magnets arranged in the upper wall of the hollow projecting member having the magnetically permeable bottom interposed between And rotating the drive circuit entire center hole periphery, it is characterized in that each disposed integrally on an outer peripheral portion of said impeller rotary shaft is located in the center around the whole of the driving circuit.

Since the present invention is constituted as described above, when the internal combustion engine starts to operate and the drive rotary body is driven to rotate, the magnetic field is radiated by a magnet disposed in the inner circumference of the center of rotation of the drive rotary body. The rotor magnetic field passes through the hollow projecting member having the magnetically permeable bottom, and a magnet integral with the impeller rotating shaft of the fluid pump and the magnet of the impeller rotating shaft are also driven to rotate. As a result, the impeller of the fluid pump is also driven to rotate. Becomes operational.

In the present invention, since the impeller rotating shaft of the fluid pump does not penetrate the bottomed hollow protruding member and the sealing member, and is rotatably supported in the inner side of the fluid pump, the seal structure of the impeller rotating shaft requires little. Since the shaft length of the impeller rotating shaft is shortened, the fluid pump can be made smaller and lighter, the structure can be simplified, the cost can be reduced, and a completely closed structure of the fluid pump can be obtained thereon. In addition, since the drive rotating body can be rotated even in a state where the impeller cannot be rotated because the fluid pump circuit is blocked, a large force is prevented from acting on the pump driving system.

Moreover, by configuring this invention as described in Claim 2 or Claim 3, a cooling water pump or a lubricating oil pump with high water tightness or oil tightness can be obtained.

Further, by configuring the present invention as described in claim 4, since no special power take-out structure is required, the fluid pump can be driven using a part of the power transmitted to the same valve system.

Further, by constructing the present invention as described in claim 5, the seal structure of the impeller rotating shaft is not required at all, and the fluid pump can be made a complete seal structure, and the fluid pump can be driven by a dynamic valve system. At the same time, maintenance, inspection, and maintenance of the fluid pump can be easily and surely performed without being disturbed by the wrapping connector band transmission band.

Further, by constructing the present invention as described in claim 6, the lubricating oil pump and the cooling water pump can be connected in series to the bottom portion of the internal combustion engine to simultaneously operate the both pumps, and the lubricating oil and the cooling water in both pumps can be completely operated. Separation can reliably prevent mixing of both.

Moreover, since this invention was comprised as described in Claim 7, the heat of combustion which generate | occur | produced in the combustion chamber in a cylinder is lost to the cooling water which flows through the water jacket in the vicinity, and the said combustion chamber is cooled to an appropriate temperature, and the cooling water heated by the heat of combustion receives the internal combustion. Cooled in the radiator portion integral with the engine, the cooled coolant is conveyed back to the water jacket by a coolant pump.

In the invention according to claim 8, since the radiator portion is integrally provided with the internal combustion engine, the cooling structure of the internal combustion engine is simplified and compactly configured, and the internal combustion engine can be made compact, lightweight, and cost down. .

Further, by constructing the present invention as described in claim 9, the heat of the cooling water heated by the combustion in the combustion chamber is absorbed by the heat absorbing fins of the fin radiator portion, and the heat absorbed by the heat absorbing fins is transferred to the heat radiating fins. Since heat can be radiated to the air from the heat radiating fins, an internal combustion engine having superior cooling performance than an air-cooled internal combustion engine can be obtained without providing a conventional radiator.

Further, by constructing the present invention as described in claim 9, the heat of the cooling water heated by the combustion in the combustion chamber is absorbed by the outer peripheral portion of the cooling water absorbing passage of the passage fin radiator portion, and the heat absorbed by the heat absorbed by the outer peripheral portion of the cooling water absorbing passage. After heat transfer, heat can be radiated from the heat radiating fin to the atmosphere, thereby improving the cooling performance of the internal combustion engine.

Hereinafter, an embodiment of the present invention shown in FIGS. 1 to 12 will be described.

The overhead valve-type four-stroke single-cylinder internal combustion engine 1 having the fluid pump structure of the present invention has a head cover 5 and a cylinder bore 10 generally directed in a front horizontal direction in an unillustrated frame of a motorcycle. Mounted in the state, the internal combustion engine body formed by integrating the cylinder block and the cylinder head in front of the left crank case (2) and the right crank case (3) divided in left and right in the overhead valve type 4-stroke single cylinder internal combustion engine (1). (4) and the head cover 5 are overlapped one by one and are integrally combined.

The piston 11 is inserted into the cylinder hole 10 formed in the internal combustion engine body 4 so as to be slidable back and forth, and the left crankshaft 12 is mounted on the left crank case 2 and the right crank case 3. ) And the right crankshaft 13 are rotatably supported through the bearing 14, the left crankshaft 12 and the right crankshaft 13 are integrally coupled to each other by a crank pin 15, and Both ends of the connecting rod 17 are rotatably fitted to the piston pin 16 (refer to FIG. 4) and the crank pin 15 inserted into the piston 11, and as the piston 11 moves up and down, The left crankshaft 12 and the right crankshaft 13 are rotationally driven.

In addition, the internal combustion engine body 4 is provided with an intake port 18 opened to the left top of the cylinder hole 10 and an exhaust port 19 opened to the top right of the cylinder hole 10. 18 is directed upward and upward, the vaporizer 21 is connected to the front end through the intake pipe 20, and the exhaust port 19 is curved to the right as shown in FIG. It is connected to the exhaust pipe.

Moreover, the intake valve 22 and the exhaust valve 23 are arrange | positioned at the cylinder hole 10 side of the intake port 18 and the exhaust port 19, respectively, and the intake valve 22 and the exhaust valve 23 are Each time the left crankshaft 12 and the right crankshaft 13 rotate two times, the opening and closing drive is performed by the copper valve device 24 only once in a required timing.

That is, the copper valve device 24 is parallel to the left crankshaft 12 and the right crankshaft 13, and rotatably supported by the bearing 25 to the internal combustion engine body 4 and the head cover 5. An intake cam 27 and an exhaust cam 28 which are positioned on the center lines of the cam shaft 26, the intake valve 22 and the exhaust valve 23, and integrally formed on the cam shaft 26, respectively; A valve spring 29 which always applies a force in the closing direction to the intake air inlet 22 and the exhaust valve 23, and a valve spring retainer 30 attached to the top ends of the intake valve 22 and the exhaust valve 23. And a drive sprocket 32 integrally disposed on the valve lifter 31 and the left crankshaft 12 mounted between the intake cam 27 and the exhaust cam 28, and two of the drive sprockets 32; Driven sprocket 33 having a double number of teeth and integrally mounted at the left end of the camshaft 26, the drive sprocket 32 and driven sprocket ( 33, and a pair of upper and lower pairs of idler sprockets 35 for providing a flare to the group 34.

In the middle of the intake valve 22 and the exhaust valve 23, the ignition 36 is detachably attached to the internal combustion engine body 4 so as to protrude in the cylinder hole 10. As shown in FIG.

In addition, the internal combustion engine body 4 is provided with a water jacket 37 near the outer periphery of the top of the cylinder hole 10, and communicates with the water jacket 37 to open to the lower left of the internal combustion engine body 4. A cooling water inflow passage 38 and a cooling water discharge passage 39 communicating with the water jacket 37 and opening to the upper right side of the internal combustion engine body 4 are formed, and the water jacket 37 and the cooling water discharge passage ( A plurality of flat cooling water absorbing passages 40 are disposed on the upper side of the upper portion 39 and are oriented in the vertical direction. The radiating fins 41 which are directed upwards and upwards on the cooling water absorbing passages 40 are formed in front and rear. A large number is formed over.

In addition, the right cover member 6 is tightly mounted integrally with the opening of the coolant discharge passage 39 located on the right side of the internal combustion engine body 4 and the right end opening of the coolant heat absorbing passage 40. The coolant discharge passage 39 and the coolant heat absorbing passage 40 communicate with each other by the convex portion 42 of the cooler 42, and the heat dissipation fins 43, which are generally directed in the front-rear direction, are provided on the outer upper portion of the right cover member 6. At the same time, a plurality of heat dissipation fins 45 are formed in parallel with each other, and the heat dissipation fins 45 are disposed in the lower side of the heat dissipation fin 43 and have heat absorbing grooves 44 therein. The path fin radiator part 46 is comprised by the heat radiation fin 41.

In addition, the ring-shaped protrusion 47 of the self-permeable cooling water pump casing 9, such as aluminum or resin, is tightly fitted into the opening of the cooling water inflow passage 38 located at the lower left of the internal combustion engine body 4, The left side surface of the cooling water pump casing 9 is tightly mounted by a bolt (not shown) on the right side surface of the partition member 7, and the right side surface of the left cover portion 8 is bolted to the left side surface of the partition member 7. (49) (see FIG. 8), it is mounted watertightly.

In addition, as shown in FIG. 12, a spiral discharge groove 50 is formed below the right side of the partition member 7, and the rear end of the spiral discharge groove 50 is the internal combustion engine body 4. Is connected to the communication hole 48 of the cooling water inflow passage 38 and the cooling water pump casing 9, and the impeller accommodating portion 51 is formed at the center of the curvature of the swirl discharge portion 50. Three arc-shaped suction holes 52 arranged in the circumferential direction communicating with the left side of the member 7 are formed, and the coolant heat absorbing passage 40 of the internal combustion engine body 4 is formed on the upper right side of the partition member 9. A communication hole 55 communicating with the concave portion 53 sealing the left end and the concave portion 54 on the left side of the partition member 7 is formed.

In addition, as shown in FIG. 10, a plurality of endothermic fins 56, which are generally directed in the vertical direction, are formed in the rear of the left side of the partition member 7 in the front-rear direction, and in the front-rear direction in the front-rear direction. A plurality of directing heat radiation fins 57 are formed in the vertical direction, and the fin radiator portion 79 is formed by the heat absorbing fins 56 and the heat radiation fins 57.

In addition, as shown in FIG. 11, the suction cap 58 is formed in the lower right side of the left cover member 8 (it is upper in FIG. 11), and the upper portion is directed upward and downward. The heat absorbing fins 59 are positioned in the middle of the vortex discharge caps 50 adjacent to each other, and are formed in a plurality in the front and rear directions, and communicate with the coolant injecting unit 60 formed at the upper end of the left cover member 8. A communication hole 61 is formed, and as shown in FIG. 1, a plurality of heat dissipation fins 62, which are generally directed in the front-rear direction, are formed on the left side of the left cover member 8 in the vertical direction. The fin radiator part 80 is comprised by the fin 59 and the heat radiation fin 62.

And, as shown in FIG. 8, the coolant pump casing 9 is located on the right side of the impeller accommodating portion 51 of the partition member 7 so as to form a rotor housing 63, and the partition member 7 The pivot blind hole 64 is formed at the center of the arrangement of the three arc-shaped suction holes 52 on the right side of the bottom), and is located on the right extension line of the center line and the bottom of the rotor storing portion 63 of the coolant pump casing 9. A pivot blind hole 65 is formed on the surface, and both ends of the pump rotation shaft 66 are rotatably inserted into both pivot blind holes 64 and 65, and an impeller 67 is mounted on the pump rotation shaft 66. Is integrally inserted and mounted, and a plurality of permanent magnets 68 arranged in a circumferential direction are alternately fixed to the outer periphery of the axial impeller 67a of the impeller 67.

Then, as shown in FIG. 8, the bearing fitting portion 67 is formed in the internal combustion engine body 4, which is coaxial with the rotor housing 63 of the cooling water pump casing 9 and located radially outward. The bearing fitting portion 69 is rotatably supported by the driven sprocket 71 through the bearing 70, and alternates the N and S poles on the inner circumference of the driven sprocket 71 in the circumferential direction. A permanent magnet 72 arranged in equal numbers with a magnet 68 is fixed, and the driven sprocket 71 is engaged with the unitary member 34, and the rotor housing 63 of the coolant pump casing 9 and the pump rotation shaft. (66), impeller (67), permanent magnet (68), bearing fitting (69), driven sprocket (71) and permanent magnet (72), the coolant pump (73) is composed of an overhead valve type. When the group 34 is returned by the operation of the 4-stroke single-cylinder internal combustion engine 1, the driven sprocket 71 rotates. The permanent magnet 68 is rotated by a magnetic force acting between the driven sprocket 71 and the integrated permanent magnet 72 and the impeller 67 and the integrated permanent magnet 68 to cool the water pump 73. Is to be driven.

In addition, as shown in FIG. 3, the starter-dried sprocket 74 is inserted into the left crankshaft 12, and the drive sprocket (not shown) and the starter of the starter motor 75 shown in FIG. An unaffiliated 76 is attached to the driven sprocket 74, and the overhead valve type 4-stroke short-cylinder internal combustion engine 1 is started by rotation of the starter motor 75. As shown in FIG.

In addition, in the left crankshaft 2 and the right crankshaft 3, the lubricating oil pump 77 is arrange | positioned as shown in FIG. 2, and when the overhead valve type 4-stroke short-cylinder internal combustion engine 1 is operated, In conjunction with this, the lubricating oil pump 77 is driven.

In addition, 78 is a generator.

Since the embodiment shown in FIG. 1 thru | or 12 is comprised as mentioned above, when the overhead valve-type 4-stroke single cylinder internal combustion engine 1 is started by the starter motor 75, The driven sprocket 71 rotates by rotation, and the coolant pump 73 is in an operating state.

Then, when the coolant pump 73 is in the operating state, as shown in FIG. 7, the coolant in the space enclosed by the left side and the right side of the partition member 7 is sucked in the inlet portion 58 of the left cover member 8. From the impeller accommodating part 51 through the arc-shaped suction hole 52 of the partition member 7, and is rotated together with the driven sprocket 71 by the impeller 67. Is discharged into the water jacket 37 through the communication hole 48 and the cooling water inflow passage 38 of the cooling water pump casing 9 from the rear end of the spiral discharge port 50; The top of is cooled.

The coolant heated to a high temperature by the heat of the combustion gas in the cylinder hole 10 is passed through the heat dissipation fin 43 of the right cover member 6 from the coolant discharge passage 39 on the upper right side of the water jacket 37. 4) flows into the coolant heat absorbing passage 40, and part of the coolant in the heat dissipation fin 43 is cooled by touching the heat dissipation fin 45, and the right cover member 6 heated by the coolant is endothermic groove 44, Heat is radiated from the passage fin radiator portion 46.

In addition, since the cooling water absorbing passage 40 of the internal combustion engine body 4 is present in a large number flatly, the cooling water absorbing passage is sufficiently absorbed while the cooling water passes through the cooling water absorbing passage 40, and is heated by the cooling water. The periphery of the 40 is cooled by the heat radiation fins 41.

In addition, the coolant passing through the coolant endothermic passage 40 flows from the right side 53 to the left side 54 of the partition member 7 through the communication hole 55 from the right side 53 of the partition member 7. The inside of the cooling water passage space between the member 7 and the left cover member 8 flows downward, and the arc-shaped suction hole 52 of the partition member 7 is again removed from the suction cup 58 of the left cover member 8. ) Can be circulated in the cooling water circulation circuit.

In addition, when the coolant flows in the cooling water passage space between the partition member 7 and the left cover member 8, the heat absorbing fin 56 of the partition member 7 and the heat absorbing fin 59 of the left cover member 8 are formed. Heat in the cooling water is absorbed by these heat absorbing fins 56 and 59, respectively, and is conducted to the inside of the partition member 7 and the left cover member 8 so as to radiate the heat radiation fin 57 and the left cover of the partition member 7. The heat is radiated to the atmosphere from the heat radiation fins 62 of the member 8.

Thus, in the embodiment shown in FIGS. 1 to 12, the cooling water circulation circuit is formed by the space surrounded by the internal combustion engine body 4, the right cover member 6, the partition member 7 and the left cover member 8. Since the passage fin radiator portion 46 and the fin radiator portions 79 and 80 are inserted into the cooling water circulation circuit, the combustion heat generated in the cylinder hole 10 is absorbed by the cooling water and isochronous. Since the cooling water heated by the combustion heat is radiated to the atmosphere, a high level of cooling performance can be obtained as compared with the air-cooled internal combustion engine.

Since the pipeline resistance of the cooling water is very small and the pumping altitude difference is small with respect to the form using a radiator of a normal type, the required driving torque of the pump is small, so that the water pump can be miniaturized.

In addition, the passage fin radiator portion 46 and the fin radiator 79 and 80 mounted in the cooling water circulation circuit are integrally woven into the overhead valve type 4-stroke short-cylinder internal combustion engine 1, and thus include a cooling system. Since the entire overhead valve-type 4-stroke single cylinder internal combustion engine 1 is compact and light in weight, and its structure is simplified, the cost can be greatly reduced, and since it does not require a conventional Colgate fin type radiator, it is robust. It is excellent in durability, and can prevent clogging due to adhesion of dust and the like, thereby obtaining stable cooling performance even in a poor dusty environment.

In the cooling water pump 73, the pump rotating shaft 66 integral with the impeller 67 does not penetrate the partition member 7 and the cooling water pump casing 9 which seal the impeller 67, and these partition members ( 7) rotatably supported by the coolant pump casing 9, the permanent magnet 68 integral with the pump rotation shaft 66 and the impeller 67, and the outer periphery of the rotor housing 63 of the coolant pump casing 9; (34) by the magnetic force of the driven sprocket (71) and the permanent magnet (72) integrally supported by the bearing fitting (69) of the internal combustion engine body (4) rotatably supported by the bearing (70) from the side. As the result of the rotation of the driven sprocket 71 driven by rotation of the impeller 67, the mechanical seal of the pump rotating shaft 66 is hardly required, and a high level of watertightness can be obtained.

In addition, since the seal structure of the pump rotating shaft 66 is not required, the pump rotating shaft 66 is shortened and the structure is simplified. As a result, the compact weight and the cost can be reduced.

In addition, although the driven sprocket 71 is forcibly rotated by the return of the unit 34 of the back valve device 24, the driven sprocket 71 and the impeller 67 are permanent magnets 68 and permanent magnets. Since torque is indirectly transmitted by mutual magnetic force of 72, explanation Even if a large resistance torque occurs in the impeller 67, sliding occurs relatively to the driven sprocket 71 and the impeller 67, and the driven sprocket Since 71 can rotate, a large force is not applied to the copper valve apparatus 24. As shown in FIG.

Moreover, since the internal combustion engine main body 4 is comprised integrally with a cylinder block and a cylinder head, a structure becomes simple, but also a cost reduction is attained at this point.

In the embodiment shown in FIGS. 1-12, the driven sprocket 71 which rotationally drives the impeller 67 of the cooling water pump 73 is arrange | positioned outside the unitary 34, and the cooling water pump 73 Impeller 67 is disposed outside the driven sprocket 71 and the groupless 34, but as shown in Figure 13 to 14, the driven sprocket 71 of the group 34 It may arrange | position inside, and may arrange | position the impeller 67 inside the driven sprocket 71 and the unitless 34. As shown in FIG.

In addition, in the embodiment shown to FIG. 1 thru | or 12, although the cooling water pump 73 and the lubricating oil pump 77 are respectively driven through different power transmission systems in different places, as shown in FIG. The crankshaft 81 and the integral drive sprocket 82 and the lubricating oil pump 77 are equipped with an unincorporated 85 on the driven shaft sprocket 84 and the integral sprocket 84, and the driven sprocket 84 and An end of the opposite rotating shaft 83 is formed in the cylindrical body 86, and the permanent magnets 72 arranged in the circumferential direction alternately with the N and S poles are integrally mounted on the inner circumferential surface of the cylindrical body 86, and The rotor housing 63 of the coolant pump casing 9 may be loosely inserted into the cylindrical body 86 in this embodiment. In this embodiment, the coolant pump 73 and the lubricating oil pump 77 are adjacent to the same axis. Even if it is, the watertightness of the cooling water pump 73 is maintained completely, Mixing of lubricating oil is reliably prevented.

Moreover, it is also possible to arrange not only the water pump drive part but the whole inside the oil chamber.

In addition, since the coolant pump 73 can be rotated using the power transmission system of the lubricating oil pump 77, the overhead valve type four-stroke single-cylinder internal combustion engine 1 can be simplified to reduce cost. have.

Claims (9)

In the fluid pump disposed in the internal combustion engine, a hollow protrusion member (9) having a self-permeable bottom is fixed to the main body of the internal combustion engine, and the driving rotary body (71) which is driven in rotation in conjunction with the operation of the internal combustion engine is the bottom. A sealing member (7) rotatably loosely inserted into an outer circumference of the hollow protrusion member (9) and abutting the outer peripheral portion of the opening of the hollow protrusion member (9) with the bottom and the hollow protrusion member (9) with the bottom The casing of the fluid pump is configured, the impeller 67 and the impeller rotating shaft 66 are rotatably supported in the casing of the fluid pump so as to be concentrically rotated with the driving rotor 71, and alternately the N and S poles. A plurality of pairs of magnets 68 and 72 arranged in the circumferential direction interpose a circumferential wall of the hollow projecting member 9 having the magnetically permeable bottom, and an inner circumferential portion of the rotation center hole of the drive rotating body 71 and the Center of driving rotor 71 The fluid pump structure in the outer peripheral portion of said impeller rotary shaft (66) located on the side to the internal combustion engine, characterized in that the respectively arranged integrally. The fluid pump structure of claim 1, wherein the fluid pump is a cooling pump of the internal combustion engine. The fluid pump structure of claim 1, wherein the fluid pump is a lubrication pump of the internal combustion engine. 4. The fluid pump structure according to any one of claims 1 to 3, wherein the drive rotating body is a sprocket which rotates in engagement with a cam chain of the same valve system. In a fluid pump disposed in an overhead cam internal combustion engine, a lepping connector band such as a cam chain or a toothed belt connecting the crankshaft and the camshaft 26 is disposed on the outermost wall of the cylinder, and the fluid pump includes the lapping connector band. A drive rotary body 71 disposed further outside and engaged with the lepping connector band to be rotated and disposed is rotatably disposed on an outer circumference of the fluid pump case base part, and the drive rotary body 71 and the impeller rotating shaft of the fluid pump are disposed. The driven rotating body integral with the 66 is magnetically coupled through the fluid pump case, and the fluid pump is driven in rotation in conjunction with the returning of the lepping connector band. The driven sprocket 71 is forcibly rotated by the return of the group 34, but the driven sprocket 71 and the impeller 67 are permanent magnets 68 and permanent magnets. Since torque is indirectly transmitted by mutual magnetic force of 72, even if a large resistance torque occurs in the impeller 67, sliding occurs relatively to the driven sprocket 71 and the impeller 67, and the driven sprocket Since 71 can continue to rotate, no great force is applied to the copper valve apparatus 24. As shown in FIG. Moreover, since the internal combustion engine main body 4 is comprised integrally with a cylinder block and a cylinder head, a structure becomes simple, but also the cost can be reduced. In the embodiment shown in FIGS. 1-12, the driven sprocket 71 which rotationally drives the impeller 67 of the cooling water pump 73 is arrange | positioned outside the unitary 34, and the cooling water pump 73 Impeller 67 is disposed outside the driven sprocket 71 and the groupless 34, but as shown in Figure 13 to 14, the driven sprocket 71 of the group 34 You may arrange | position inside and arrange | position the impeller 67 inside the driven sprocket 71 and the unitary 34. Moreover, in the embodiment shown to FIG. 1 thru | or 12, the fluid pump structure in the internal combustion engine lubricating with the cooling water pump 73. Moreover, in FIG. The fluid pump structure as claimed in claim 1, wherein the driving rotary body is integrally coupled to a rotating shaft of a lubricating oil pump disposed adjacent to a lubrication tank of an internal combustion engine bottom, and the fluid pump is a cooling water pump. A cooling water pump having a fluid pump structure according to claim 1 is disposed in the lower portion near the cylinder, and at the same time, the radiator portions 46, 79, and 80 for cooling the heated cooling water through the water jacket 37 near the cylinder are provided. Located in the vicinity of the cylinder and integrally disposed in the internal combustion engine, the cooling water pump 38, the water jacket 37, the radiator portions 46, 79, 80, and the cooling water passages 38, 39, which communicate with each other. A cooling structure in an internal combustion engine, characterized in that a cooling water circulation circuit is formed by (40). According to claim 7, Fin radiator protruding into the cooling water passage and the heat sink fin for heat-exchanging the cooling water aberration in the cooling water passage, and a heat sink fin protruding outside the internal combustion engine to exchange heat with the atmosphere inside and outside the cooling water circulation A cooling structure in an internal combustion engine, characterized by being disposed in a circuit. According to claim 7 or 8, wherein a plurality of cooling water absorption passages formed in parallel in the body near the cylinder of the internal combustion engine heat exchange with the cooling water, and the heat radiation fins protruding outside the cooling water absorption passage to heat exchange with the atmosphere. A cooling structure in an internal combustion engine, wherein the passage fin radiator portion integrally provided is disposed in the cooling water circulation circuit.

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