JPH1089069A - Fluid pump structure in internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid pump structure provided on an internal combustion engine and having high sealing property. SOLUTION: A cooling water pump casing 7 having magnetism transmitting property is fixed to an internal combustion engine main body 4, a driven sprocket 71 to be rotated and driven by being interlocked with the operation of an overhead valve-type four-stroke single cylinder internal combustion engine is rotatably and loosely fitted on the outer periphery of a rotor housing part 63 of the cooling water pump casing 9, a casing of a cooling water pump is constituted of a partition member 7 to be brought in contact with the opening outer periphery of the cooling water pump casing 9, and the rotor housing part 63 of the cooling water pump casing 9, an impeller 67 and a pump rotary shaft 66 are rotatably supported in the casing, and a plurality of pairs of permanent magnets 68, 72 whose N poles and S poles are alternately arranged in the circumferential direction are integrally provided on the outer peripheral surface of the impeller 67 and the inner peripheral surface of the driven sprocket 71.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pump structure having a high sealing property attached to an internal combustion engine, and more particularly to a cooling water pump.

[0002]

2. Description of the Related Art A cooling water pump and a lubricating oil pump attached to an internal combustion engine are formed separately from a main body of the internal combustion engine, and a pump drive shaft thereof is mainly provided protruding into a crankcase.
A gear or a sprocket mounted on the pump drive shaft is connected to a crankshaft or the like of the internal combustion engine (for example, see Japanese Patent Publication No. 56-28209).

The cooling water pump and the radiator are provided separately from the internal combustion engine. The cooling water pump, the radiator and the internal combustion engine are connected by a flexible pipe such as a hose.
A cooling water circulation circuit was configured.

[0004]

In the above-mentioned conventional fluid pump, since the pump drive shaft penetrates the pump casing, the fluid in the pump casing leaks to the outside through the pivot portion of the pump drive shaft. It was necessary to provide a mechanical seal so as not to do this.

[0005] When this mechanical seal is provided, the pump drive shaft becomes longer to ensure the sealing property, the number of parts and the number of processing steps increase, power loss occurs due to friction at the seal portion, and the fluid is cooled by cooling water. In the case of (1), it is necessary to provide a drain passage to the outside when a slight leak occurs due to abrasion, aging and the like.

Further, in an internal combustion engine provided with a radiator separately, the number of parts is remarkably increased, the cost is increased, and the connection work and maintenance and inspection of the flexible pipe become complicated, and also the internal combustion engine and its accessories are provided. It was inevitable that the entire equipment would become larger.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an improvement in a fluid pump structure and a cooling structure in an internal combustion engine overcoming such difficulties, and relates to a main body of the internal combustion engine in a fluid pump provided in the internal combustion engine. And a magnetically permeable bottomed hollow projecting member is fixed, and a rotation center hole of a driving rotating body which is driven to rotate in conjunction with the operation of the internal combustion engine is rotatably loosely fitted around the outer periphery of the bottomed hollow projecting member. The casing of the fluid pump is composed of the hermetically closed structure abutting the outer peripheral portion of the opening of the bottomed hollow protruding member and the bottomed hollow protruding member, and an impeller and an impeller rotation shaft are provided in the casing of the fluid pump. A plurality of pairs of magnets, which are rotatably supported concentrically with the driving rotator and in which N and S poles are alternately arranged in the circumferential direction, sandwich the peripheral wall of the magnetically permeable bottomed hollow protruding member and rotate the driving rotator. A rotation center hole inner peripheral portion of each of the outer peripheral portion of said impeller rotary shaft located closer to the center of the driving rotor is characterized in that the integrally provided.

The present invention is configured as described above, so that when the internal combustion engine starts operating and the driving rotary body is driven to rotate, the internal peripheral portion of the rotation center hole of the driving rotary body is rotated. A rotating magnetic field is generated by the provided magnet, and the rotating magnetic field penetrates through the magnetically permeable bottomed hollow projecting member and extends to a magnet integral with the impeller rotating shaft of the fluid pump, and the magnet of the impeller rotating shaft also The fluid pump is driven to rotate, and as a result, the impeller of the fluid pump is also driven to rotate, and the fluid pump is put into operation.

According to the present invention, the impeller rotary shaft of the fluid pump does not penetrate the bottomed hollow projecting member and the closed structure, but is rotatably supported inside these components. No seal structure is required, the shaft length of the impeller rotating shaft is shortened, and the fluid pump can be reduced in size and weight, and the structure can be simplified to reduce the cost. Further, a completely sealed structure of the fluid pump can be obtained, and even when the fluid pump circuit is closed and the impeller cannot be rotated, the drive rotating body can be rotated and a large force is prevented from acting on the pump drive system. Is done.

[0010] Further, by configuring the present invention as described in claim 2 or claim 3, it is possible to obtain a cooling water pump or a lubricating oil pump having high watertightness or high oiltightness.

Further, according to the present invention, the fluid pump is driven by utilizing a part of the power transmitted to the valve train without requiring a special power take-out mechanism. can do.

Further, by configuring the present invention as described in claim 5, the fluid pump can be made to have a complete seal structure without any need for a seal structure for the impeller rotary shaft. And the maintenance, inspection and maintenance of the fluid pump can be performed easily and reliably without being disturbed by the wrapping transmission band.

Further, according to the present invention, a lubricating oil pump and a cooling water pump can be connected in series at the bottom of the internal combustion engine so that both pumps can be operated at the same time. The lubricating oil and the cooling water in the pump can be completely separated, and the mixing of both can be reliably prevented.

According to the present invention, the combustion heat generated in the combustion chamber in the cylinder is taken by the cooling water flowing through the water jacket near the cylinder, and the combustion chamber is cooled to an appropriate temperature. The cooling water that has been cooled and heated by receiving the heat of combustion is cooled by a radiator unit integrated with the internal combustion engine, and the cooled cooling water is sent again to the water jacket by a cooling water pump.

Further, in the invention according to claim 8, since the radiator is provided integrally with the internal combustion engine,
The cooling structure of the internal combustion engine is simplified, and the internal combustion engine is configured to be compact, so that the internal combustion engine can be reduced in size, weight, and cost.

Further, according to the present invention, the heat of the heated cooling water is absorbed by the heat absorbing fins of the fin radiator portion by the combustion in the combustion chamber, and the heat absorbing fins are heated by the heat absorbing fins. After transmitting the absorbed heat to the radiating fins, the heat can be radiated from the radiating fins to the atmosphere without using a conventional radiator.
An internal combustion engine having higher cooling performance than an air-cooled internal combustion engine can be obtained.

Further, according to the ninth aspect of the present invention, the heat of the cooling water heated by the combustion in the combustion chamber is absorbed by the outer periphery of the cooling water heat absorbing passage of the passage fin radiator. After the heat absorbed by the outer periphery of the cooling water heat absorbing passage is transferred to the radiating fins, the heat can be radiated from the radiating fins to the atmosphere, and the cooling performance of the internal combustion engine can be improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in FIGS. 1 to 12 will be described below. The overhead valve type four-stroke single-cylinder internal combustion engine 1 having the fluid pump structure of the present invention is mounted on a frame (not shown) of a motorcycle with a head cover 5 and a cylinder hole 10 directed substantially horizontally in the forward direction. In the overhead valve type four-stroke single-cylinder internal combustion engine 1, an internal combustion engine body 4 and a head cover 5, which are formed by integrating a cylinder block and a cylinder head, are arranged in front of a left and right crankcase 2 and a right crankcase 3 which are divided into right and left parts. They are stacked and joined together.
A piston 11 is slidably fitted back and forth in a cylinder hole 10 formed in the internal combustion engine body 4, and a left crankshaft 12 and a right crankshaft 12 are fitted in the left crankcase 2 and the right crankcase 3, respectively. A left crankshaft 13 and a right crankshaft 13 are rotatably supported via bearings 14, and the left crankshaft 12 and the right crankshaft 13 are integrally connected to each other with a crankpin 15.
The two ends of a connecting rod 17 are rotatably fitted to a piston pin 16 (see FIG. 4) fitted to the crank pin 15 and the left crank shaft 12 and the right crank shaft 12 as the piston 11 moves up and down. The crankshaft 13 is driven to rotate.

Further, a cylinder hole 10 is provided in the internal combustion engine body 4.
An intake port 18 opening to the left top and an exhaust port 19 opening to the right top of the cylinder hole 10 are formed, and the intake port 18 is directed obliquely upward and upward, and an intake pipe 20 is provided at the tip thereof. A vaporizer 21 is connected, and the exhaust port 19 is
As shown in FIG. 2, the airbag is bent rightward and connected to an exhaust pipe (not shown).

Further, an intake port 18 and an exhaust port
On the cylinder hole 10 side of 19, the intake valve 22 and the exhaust valve
The intake valve 22 and the exhaust valve 23 are opened and closed by the valve train 24 at a required timing only once every two rotations of the left crankshaft 12 and the right crankshaft 13. It has become.

That is, the valve gear 24 includes a camshaft 26 rotatably supported by the internal combustion engine body 4 and the head cover 5 via bearings 25 in parallel with the left crankshaft 12 and the right crankshaft 13. , The intake valve
An intake cam 27 and an exhaust cam 28 integrally formed on the camshaft 26 on the center lines of the exhaust valve 22 and the exhaust valve 23, and a valve spring for urging the intake valve 22 and the exhaust valve 23 in a normally closing direction. 29, and a valve spring retainer 30 attached to the top end of the intake valve 22 and the exhaust valve 23.
A valve lifter 31 provided with an intake cam 27 and an exhaust cam 28, a drive sprocket 32 provided integrally with the left crankshaft 12, and a drive sprocket.
A driven sprocket 33 having twice the number of teeth of 32 and integrally attached to the left end of the camshaft 26; an endless chain 34 mounted on the drive sprocket 32 and the driven sprocket 33; Give up and down 1
It consists of a pair of idler sprockets 35 for tensioners.

An ignition plug 36 is removably mounted on the internal combustion engine main body 4 so as to be located between the intake valve 22 and the exhaust valve 23 and protrude into the cylinder hole 10.

A water jacket 37 is formed in the internal combustion engine body 4 near the outer periphery of the top of the cylinder hole 10, and the cooling water inflowing to the water jacket 37 and opening at the lower left portion of the internal combustion engine body 4. A passage 38 and a cooling water discharge passage 39 communicating with the water jacket 37 and opening at the upper right side of the internal combustion engine main body 4 are formed. The cooling water discharge passage 39 is located above the water jacket 37 and the cooling water discharge passage 39. A large number of flat cooling water heat absorption passages 40 extending in the vertical direction are formed in the front and rear direction, and a plurality of radiation fins 41 directed obliquely upward and forward of the cooling water heat absorption passage 40 are formed in the front and rear direction.

Further, the right lid member 6 is attached to the opening of the cooling water discharge passage 39 located on the right side of the internal combustion engine main body 4 and the right end opening of the cooling water heat absorbing passage 40 in a watertight and integral manner. The cooling water discharge passage 39 and the cooling water heat absorption passage 40 are communicated with each other by the concave portion 42.
A plurality of radiating fins 43 oriented substantially in the front-rear direction are formed vertically, and two radiating fins 45 provided below the radiating fins 43 and provided with heat absorbing grooves 44 therein are formed in parallel. The cooling water heat absorption passage 40 and the radiation fin 41
Thus, the passage fin radiator section 46 is configured.

Further, a ring-shaped projection 47 of a cooling water pump casing 9 having magnetic permeability, such as aluminum or resin, is fitted to the opening of the cooling water inflow passage 38 located on the lower left side of the internal combustion engine body 4 in a watertight manner. At the same time, the left side surface of the cooling water pump casing 9 is watertightly attached to the right side surface of the partition member 7 with bolts (not shown), and the right side surface of the left lid member 8 is bolted to the left side surface of the partition member 7. (See FIG. 8).

As shown in FIG. 12, a spiral discharge recess 50 is formed in the lower part of the right side of the partition member 7,
The rear end of the spiral discharge recess 50 communicates with the cooling water inflow passage 38 of the internal combustion engine body 4 and the communication hole 48 of the cooling water pump casing 9, and an impeller housing recess 51 is formed at the curved center of the spiral discharge recess 50. At the same time, three arcuate suction holes 52 arranged in the circumferential direction communicating with the left side surface of the partition member 7 are formed, and the upper part of the right side surface of the partition member 7 is provided with the cooling water heat absorption passage 40 of the internal combustion engine body 4. Recess 53 for sealing left end and partition member 7
A communication hole 55 communicating with the concave portion 54 on the left side surface of is formed.

Further, as shown in FIG. 10, a plurality of heat absorbing fins 56 oriented substantially in the vertical direction are formed in the rear part on the left side of the partition member 7 in the front-rear direction. A plurality of radiation fins 57 extending in the front-rear direction are formed in the vertical direction, and the heat absorption fins 56 and the radiation fins 57 constitute a fin radiator 79.

Further, as shown in FIG. 11, a suction recess 58 is formed in the lower portion (the upper portion in FIG. 11) of the right side surface of the left cover member 8, and is directed upward and substantially upward. The heat absorbing fins 59 are disposed adjacent to the spiral discharge recess 50.
A plurality of communication holes 61 are formed in the middle of the left cover member and extend in the front-rear direction. The communication holes 61 communicate with a cooling water injection unit 60 formed at the upper end of the left cover member 8. As shown in FIG. A radiation fin 62 oriented substantially in the front-rear direction is provided on the left side surface of the member 8.
Are formed in the vertical direction, and the heat absorbing fins 59 and the heat radiating fins 62 constitute a fin radiator section 80.

As shown in FIG. 8, a rotor housing 63 is formed in the cooling water pump casing 9 on the right side of the impeller housing recess 51 of the partition member 7. On the surface, a pivot blind hole 64 is formed at the center of the arrangement of the three arc-shaped suction holes 52, and is located on an extension of the center line to the right and formed on the bottom surface of the rotor housing 63 of the cooling water pump casing 9. A pivot blind hole 65 is formed, both ends of the pump rotation shaft 66 are rotatably fitted in the both pivot blind holes 64, 65, and an impeller 67 is integrally fitted to the pump rotation shaft 66,
On the outer periphery of the shaft impeller 67a of the impeller 67, a permanent magnet 68 in which a plurality of N and S poles are alternately arranged in the circumferential direction is fixed.

As shown in FIG. 8, a bearing fitting recess 69 is formed in the internal combustion engine main body 4 at a position radially outward of the rotor housing 63 of the cooling water pump casing 9. A driven sprocket 71 is rotatably supported by a mating recess 69 via a bearing 70, and the same number of permanent magnets 68 as the permanent magnets 68 are arranged on the inner periphery of the driven sprocket 71 in the circumferential direction alternately with N and S poles. 72 is fixed, and the driven sprocket 71 is
And the rotor housing portion of the cooling water pump casing 9
A cooling water pump 73 is composed of a pump shaft 63, an impeller 67, a permanent magnet 68, a bearing fitting recess 69, a driven sprocket 71 and a permanent magnet 72, and an overhead valve type four-stroke single-cylinder internal combustion engine 1. Driving in endless chain
When 34 is forwarded, the driven sprocket 71 is driven to rotate, and a permanent magnet 72 integrated with the driven sprocket 71 and
The magnetic force acting between the impeller 67 and the integral permanent magnet 68 rotates the permanent magnet 68, and drives the cooling water pump 73.

As shown in FIG. 3, a starter driven sprocket 74 is fitted to the left crankshaft 12, and a drive sprocket (not shown) of the starter motor 75 shown in FIG. An endless chain 76 is bridged between the internal combustion engine 74 and the starter motor 75 to start the overhead valve type four-stroke single-cylinder internal combustion engine 1.

Further, a lubricating oil pump 77 is provided in the left crankcase 2 and the right crankcase 3 as shown in FIG. 2, and when the overhead valve type four-stroke single cylinder internal combustion engine 1 is operated. In conjunction with this, the lubricating oil pump 77
Is driven. In the figure, reference numeral 78 denotes a generator.

Since the embodiment shown in FIGS. 1 to 12 is configured as described above, when the starter motor 75 starts the overhead valve type four-stroke single cylinder internal combustion engine 1, the endless chain 34 is forwarded. Thus, the driven sprocket 71 is driven to rotate, and the cooling water pump 73 enters an operating state.

When the cooling water pump 73 is operated, as shown in FIG. 7, the cooling water in the space surrounded by the left side and right side of the partition member 7 is supplied to the suction recess of the left lid member 8. The impeller 67 is sucked into the impeller housing recess 51 through the arc-shaped suction hole 52 of the partition member 7 and discharged to the spiral discharge recess 50 by the impeller 67 rotating around the driven sprocket 71. From the end, the water is sent to the water jacket 37 through the communication hole 48 of the cooling water pump casing 9 and the cooling water inflow passage 38, and the top of the cylinder hole 10 is cooled.

The cooling water heated to a high temperature by the heat of the combustion gas in the cylinder hole 10 flows through the cooling water discharge passage 39 on the upper right side of the water jacket 37 to the radiation fins 43 of the right lid member 6.
Flows into the cooling water heat absorbing passage 40 of the internal combustion engine body 4 through the
A part of the cooling water in the radiating fins 43 is cooled by touching the radiating fins 45, and the right lid member 6 heated by the cooling water is radiated by the heat absorbing groove 44 and the passage fin radiator 46.

Further, since the cooling water heat absorbing passage 40 of the internal combustion engine main body 4 is flat and numerous, the cooling water absorbs heat sufficiently while passing through the cooling water heat absorbing passage 40 and is heated by the cooling water. The periphery of the cooling water heat absorption passage 40 is cooled by the radiation fins 41.

Further, the cooling water having passed through the cooling water heat absorbing passage 40 flows from the right concave portion 53 of the partition member 7 into the left concave portion 54 of the partition member 7 through the communication hole 55, and the partition member 7, the left lid member 8 Flows downward in the cooling water passage space sandwiched by the holes, and again from the suction concave portion 58 of the left lid member 8 to the arc-shaped suction hole of the partition member 7.
52 and can circulate through the cooling water circulation circuit.

Further, when the cooling water flows in the cooling water passage space sandwiched between the partition member 7 and the left lid member 8, the heat absorbing fins 56 of the partition member 7 and the heat absorbing fins 59 of the left lid member 8 touch. Then, the heat in the cooling water is absorbed by the heat absorbing fins 56 and 59, and is conducted through the partition member 7 and the left lid member 8, respectively. The heat is dissipated.

As described above, in the embodiment shown in FIGS. 1 to 12, the internal combustion engine body 4, the right cover member 6, the partition member 7
A cooling water circulation circuit is constituted by the space surrounded by the left lid member 8 and the passage fin radiator portion 46 and the fin radiator portions 79 and 80 are interposed in the cooling water circulation circuit. The generated combustion heat is absorbed by the cooling water, and the cooling water heated by the combustion heat is radiated to the atmosphere, so that a higher level of cooling performance can be obtained as compared with an air-cooled internal combustion engine.

Since the pipe resistance of the cooling water is very small and the head difference is small as compared with the configuration using a normal type radiator, the required driving torque of the pump is small and the water pump can be downsized.

The passage fin radiator 46 and the fin radiator 79, which are provided in the cooling water circulation circuit,
80 is integrated into the overhead valve type four-stroke single-cylinder internal combustion engine 1, so that the entire overhead valve type four-stroke single-cylinder internal combustion engine 1 including the cooling system is reduced in size, weight, and simplified in structure. Radiator of conventional corrugated fin type is not required, so it is durable and durable, clogging due to adhesion of dust and the like is avoided, and there is a lot of dust. Stable cooling performance can be obtained even in a poor environment.

Further, in the cooling water pump 73, the pump rotating shaft 66 integral with the impeller 67 does not penetrate the partition member 7 for sealing the impeller 67 and the cooling water pump casing 9, and the partition member 7, the cooling water pump A permanent magnet 68 rotatably supported by the casing 9 and integral with the pump rotating shaft 66 and the impeller 67;
Due to the magnetic force of the driven sprocket 71 and the permanent magnet 72 integrated with the driven sprocket 71 rotatably supported through the bearing 70 in the bearing fitting recess 69 of the internal combustion engine main body 4 on the outer peripheral side of the rotor storage portion 63, the endless chain 34 Impeller while being dragged by the rotation of the driven sprocket 71
As a result of the rotation of 67, a high level of watertightness is obtained without any need for a mechanical seal of pump rotary shaft 66.

Since the sealing structure for the pump rotating shaft 66 is not required, the pump rotating shaft 66 is short and the structure is simplified, so that it is possible to reduce the size, weight and cost in this regard.

Further, the driven sprocket 71 is forcibly driven to rotate by the rotation of the endless chain 34 of the valve train 24, and the driven sprocket 71 and the impeller 67 are mutually magnetized by the permanent magnet 68 and the permanent magnet 72. Since the torque is indirectly transmitted by the force, even if a large resistance torque is generated in the impeller 67, the driven sprocket
Slip occurs relatively between the impeller 71 and the impeller 67, and the driven sprocket 71 can continue to rotate, so that a large force is not applied to the valve train 24.

Further, since the internal combustion engine main body 4 is constructed by integrating the cylinder block and the cylinder head, the structure is simplified, and the cost can be reduced in this aspect as well.

In the embodiment shown in FIGS. 1 to 12,
The driven sprocket 71 for rotating and driving the impeller 67 of the cooling water pump 73 is disposed outside the endless chain 34, and the impeller 67 of the cooling water pump 73 is driven by the driven sprocket 71.
13 is provided outside the endless chain 34.
Or driven sprocket as shown in FIG.
The 71 may be disposed inside the endless chain 34, and the impeller 67 may be provided inside the driven sprocket 71 and the endless chain 34.

Also, in the embodiment shown in FIGS. 1 to 12, the cooling water pump 73 and the lubricating oil pump 77 are driven separately and through separate power transmission systems. Endless chain 85 over a drive sprocket 82 integral with the crankshaft 81 and a driven sprocket 84 integral with the rotating shaft 83 of the lubricating oil pump 77, and the end of the rotating shaft 83 opposite the driven sprocket 84. A permanent magnet 72 having N and S poles arranged alternately in the circumferential direction is integrally attached to the inner peripheral surface of the cylindrical body 86, and a cooling water pump is provided in the cylindrical body 86. Rotor storage part of casing 9
63 may be loosely fitted concentrically, and in this embodiment, even if the cooling water pump 73 and the lubricating oil pump 77 are adjacent on the same axis, the water tightness of the cooling water pump 73 is completely maintained. Therefore, the mixing of the cooling water and the lubricating oil is reliably prevented.

It is also possible to arrange not only the water pump driving part but also the whole inside the oil chamber.

Furthermore, since the cooling water pump 73 can be driven to rotate using the power transmission system of the lubricating oil pump 77, the structure of the overhead valve type four-stroke single-cylinder internal combustion engine 1 can be simplified to reduce costs. Can be.

[Brief description of the drawings]

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

FIG. 2 is a right side view of FIG.

FIG. 3 is a vertical sectional plan view cut along the line III-III in FIG. 1;

FIG. 4 is a longitudinal sectional side view cut along the line IV-IV in FIG. 3;

FIG. 5 is a view taken in the direction of arrows VV in FIG. 3;

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

FIG. 7 is a cross-sectional rear view cut along the line VII-VII of FIGS. 1, 2, 4 and 5;

FIG. 8 is a cross-sectional view cut along the line VIII-VIII in FIGS. 1, 2, 4, and 5;

FIG. 9 is a view taken in the direction of arrows IX-IX in FIG. 8;

FIG. 10 is a view taken in the direction of arrows XX in FIG. 3;

11 is a view taken in the direction of arrows XI-XI in FIG. 3; when the left lid member 8 is pulled up and down and attached to the partition member 7 in FIG. 10, the state shown in FIG. 1 is obtained.

FIG. 12 is a view taken in the direction of arrows XII-XII in FIG. 3;

FIG. 13 is a vertical sectional view of another embodiment of the present invention.

14 is a view taken in the direction of arrows XIV-XIV in FIG.

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

[Description of Signs] 1 ... overhead valve type 4-stroke single cylinder internal combustion engine, 2 ... left crankcase, 3 ... right crankcase, 4 ... internal combustion engine main body, 5 ... head cover, 6 ... right lid member, 7 ... partition Member, 8: Left lid member, 9: Cooling water pump casing, 10
... Cylinder bore, 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 ... valve gear, 25 ... Bearing, 26 ... Camshaft, 27 ... Intake cam, 28 ... Exhaust cam, 29 ... Valve spring, 30 ... Valve spring retainer, 31 ... Valve lifter, 32 ... Drive sprocket, 33 ... Driven sprocket, 34 ... Endless chain, 35 ... Idler sprocket, 36 ignition plug, 37 water jacket, 38 cooling water inflow passage, 39 cooling water discharge passage, 40 cooling water heat absorption passage, 41 radiation fin, 42 recess, 43 radiation fin, 44 Heat-absorbing groove, 45 radiating fin,
46: passage fin radiator, 47: ring-shaped protrusion, 48
... communication holes, 49 ... bolts, 50 ... spiral discharge recesses, 51 ... impeller storage recesses, 52 ... arc-shaped suction holes, 53 ... recesses, 54 ... recesses, 55 ... communication holes, 56 ... heat absorption fins, 57 ... heat dissipation fins , 58
... Suction recess, 59 ... Heat absorbing fin, 60 ... Cooling water injection part, 61 ...
Communication hole, 62: radiation fin, 63: rotor housing, 64: pivot blind hole, 65: pivot blind hole, 66: pump rotating shaft, 67: impeller, 68: permanent magnet, 69: bearing fitting recess, 70… bearing, 71… driven sprocket, 72… permanent magnet, 73
... Cooling water pump, 74 ... Starter driven sprocket,
75 starter motor, 76 endless chain, 77 lubricating oil pump, 78 generator, 79 fin radiator section, 80 fin radiator section, 81 crank shaft, 82 drive sprocket, 83 rotating shaft, 84 ... Driven sprockets,
85 ... endless chain, 86 ... cylindrical body.

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[Procedure amendment]

[Submission date] November 7, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

SUMMARY OF THE INVENTION The present invention relates to an improvement in a fluid pump structure and a cooling structure in an internal combustion engine overcoming such difficulties, and relates to a main body of the internal combustion engine in a fluid pump provided in the internal combustion engine. A magnetically permeable bottomed hollow protruding member is fixed, and a driving rotating body rotatably driven in conjunction with the operation of the internal combustion engine is rotatably loosely fitted around the outer periphery of the bottomed hollow protruding member. A casing of a fluid pump is constituted by the hermetically closed structure abutting on the outer peripheral portion of the opening of the bottom hollow protruding member and the bottomed hollow protruding member, and an impeller and an impeller rotating shaft are provided in the casing of the fluid pump, and the drive rotating body and Concentrically rotatably supported,
A plurality of pairs of magnets, in which N and S poles are alternately arranged in the circumferential direction, sandwich the circumferential wall of the magnetically permeable bottomed hollow protruding member, and an inner peripheral portion of a rotation center hole of the driving rotator; Are provided integrally with the outer peripheral portion of the impeller rotation shaft located near the center of the impeller.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in FIGS. 1 to 12 will be described below. The overhead valve type four-stroke single-cylinder internal combustion engine 1 having the fluid pump structure of the present invention is mounted on a frame (not shown) of a motorcycle in a state where the head cover 5 and the cylinder hole 10 are directed substantially in the front horizontal direction. In the overhead valve type four-stroke single-cylinder internal combustion engine 1, an internal combustion engine body 4 and a head cover 5, which are formed by integrating a cylinder block and a cylinder head, are arranged in front of a left and right crankcase 2 and a right crankcase 3 which are divided into right and left parts. They are stacked and joined together. A cylinder hole 10 formed in the internal combustion engine body 4 is also provided.
In, the piston 11 is slidably fitted in the front and rear, the left crank case 2 and the right crankcase 3, the left crank shaft 12 and the right crank shaft 13 via the bearing 14 rotates is freely pivoted, left side crank shaft 12 and the right crank shaft 13 mutually coupled integrally with a crank pin 15, the said piston 11 in fitting to a piston pin 16 (see FIG. 4) crank Both ends of the connecting rod 17 are rotatably fitted to the pin 15, and the left crankshaft 12 and the right crankshaft 13 are driven to rotate as the piston 11 moves up and down.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

As shown in FIG. 8, the cooling water pump casing 9 is coaxial with the rotor housing 63 and
A bearing fitting concave portion 69 is formed in the internal combustion engine main body 4 at a position radially outward of the rotor housing portion 63 , and a driven sprocket 71 is rotatably supported by the bearing fitting concave portion 69 via a bearing 70. On the inner circumference of the driven sprocket 71, permanent magnets 72 arranged in the same number as the permanent magnets 68 in the circumferential direction, alternately having N and S poles, are fixed.
4, the rotor housing 63 of the cooling water pump casing 9, the pump rotation shaft 66, the impeller 67, the permanent magnet 6
8, bearing fitting recess 69, driven sprocket 7
1 and a permanent magnet 72 constitute a cooling water pump 73, and an overhead valve type four-stroke single cylinder internal combustion engine 1
When the endless chain 34 is fed in the operation of the driven sprocket 71, the driven sprocket 71 is rotationally driven, and the driven sprocket 7 is rotated.
The permanent magnet 68 is rotated by the magnetic force acting between the permanent magnet 72 integral with the first motor 1 and the permanent magnet 68 integral with the impeller 67, and the cooling water pump 73 is driven.

Claims (9)

[Claims] 1. A fluid pump provided in an internal combustion engine, wherein a magnetically permeable bottomed hollow protruding member is fixed to a main body of the internal combustion engine, and a driving rotary body that is driven to rotate in conjunction with the operation of the internal combustion engine. A rotation center hole is rotatably fitted around the outer periphery of the bottomed hollow protruding member so as to be freely rotatable. An impeller and an impeller rotating shaft are rotatably supported concentrically with the driving rotating body in a casing of the fluid pump, and a plurality of pairs of magnets in which N and S poles are alternately arranged in a circumferential direction are provided. An inner peripheral portion of the rotation center hole of the driving rotator and an outer peripheral portion of the impeller rotating shaft located near the center of the driving rotator with the peripheral wall of the magnetically permeable bottomed hollow projecting member interposed therebetween. This was provided in Fluid pump structure in an internal combustion engine according to claim. 2. The cooling water pump structure according to claim 1, wherein the fluid pump is a pump for cooling the internal combustion engine. 3. The lubricating oil pump structure according to claim 1, wherein the fluid pump is a lubricating pump for the internal combustion engine. 4. The fluid pump structure according to claim 1, wherein the driving rotary body is a sprocket that is driven to rotate by meshing with a cam chain of a valve train. 5. A fluid pump provided in an overhead cam type internal combustion engine, wherein a winding transmission band such as a cam chain or a toothed belt for connecting a crankshaft and a camshaft is disposed on an outermost wall of a cylinder. The pump is further disposed outside the wrapping transmission band, and a driving rotator that is rotatably driven while meshing with the wrapping transmission band is rotatably provided on the outer periphery of the fluid pump case base. The driven rotary body integral with the impeller rotation shaft of the fluid pump is magnetically coupled via the fluid pump case, and the fluid pump is driven to rotate in conjunction with the rotation of the wrapping transmission band. A fluid pump structure in an internal combustion engine. 6. The driving rotary body is integrally connected to a rotary shaft of a lubricating oil pump disposed adjacent to a lubricating oil reservoir at a bottom of the internal combustion engine, and the fluid pump is a cooling water pump. The fluid pump structure according to claim 1, wherein 7. A cooling water pump, which is rotatably driven in conjunction with the operation of the internal combustion engine, is provided at a lower portion near the cylinder, and cools the heated cooling water passing through a water jacket near the cylinder. A radiator section for cooling is provided integrally with the internal combustion engine so as to be located near the cylinder, and is cooled by the cooling water pump, the water jacket, the radiator section, and a cooling water passage communicating these with each other. A cooling structure for an internal combustion engine, comprising a water circulation circuit. 8. A heat absorbing fin projecting into the cooling water passage and exchanging heat with cooling water in the cooling water passage, and a radiation fin projecting outside the internal combustion engine and exchanging heat with the atmosphere are integrally provided inside and outside. 8. The cooling structure for an internal combustion engine according to claim 7, wherein the fin radiator is disposed in the cooling water circulation circuit. 9. A cooling water heat absorbing passage formed in parallel in a body near a cylinder of the internal combustion engine and exchanging heat with cooling water, and a radiation fin projecting outside the cooling water heat absorbing passage and exchanging heat with the atmosphere. 9. The cooling water structure for an internal combustion engine according to claim 7, wherein a passage fin radiator portion integrally provided with the inside and outside is disposed in the cooling water circulation circuit.