KR100688221B1 - Auxiliary structure for internal combustion engine - Google Patents

Abstract

By integrating the ACG stator base into the auxiliary mechanism base, the number of parts can be reduced, the attachment of the auxiliary mechanism and the power transmission system can be facilitated, and the distance between the axes can be maintained with high accuracy to reduce noise.

A crankcase having an opening for supporting and cranking the crankshaft and having an opening for penetrating the crankshaft; An auxiliary mechanism base provided with an attachment portion of an auxiliary mechanism driven by a shaft, and having a boss portion for supporting an intermediate rotation shaft for power transmission on its wall portion.

Description

Auxiliary mechanism attachment structure of internal combustion engine {SUBSIDIARY MECHANISM ATTACHMENT STRUCTURE OF INTERNAL COMBUSTION ENGINE}

1 is a side view of a scooter type motorcycle 1 equipped with an internal combustion engine having an auxiliary mechanism attachment structure of the present invention;

Fig. 2 is a view of the longitudinal section of the power unit 6 of the motorcycle shown from the left;

3 is an exploded view of a cross section of a surface including a cylinder axis, a crankshaft, a pulley shaft, and a gear shaft of the power unit 6;

4 is a view of the longitudinal section of the internal combustion engine 7 seen from the right side;

5 is an exploded view of the cross section passing through the crankshaft 28, the oil pump shaft 131, and the water pump shaft 141 of FIG. 4 (V-V cross-sectional development view of FIG. 4),

6 is a right side view of the right crankcase 23B,

FIG. 7 is a VIII-VIII cross-sectional view of FIG. 6;

8 is a right side view of the auxiliary mechanism base 110,

9 is a left side view (rear side of FIG. 8) of the auxiliary mechanism base 110,

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

11 is a right side view of the water pump casing 120,

12 is a left side view of the same water pump casing 120 (rear side of FIG. 1),

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

FIG. 14 is a sectional view taken along the line IV-XIV of FIG. 11.

<Description of Symbols for Main Parts of Drawings>

1: scooter type two-wheeled vehicle 2: body frame

3: head pipe 4: front fork

5: front wheel 6: power unit

7: internal combustion engine 8: power transmission device

9: rear wheel support 10: rear wheel

11: rear suspension 12: article storage

13: sheet 14: step floor

15: fuel tank 16: body cover

20: cylinder block 21: cylinder head

21a: contact surface 22: cylinder head cover

23: crankcase 23A: left crankcase

23B: right crankcase 24: cylinder hole

25: piston 26: bearing

27: bearing 28: crankshaft

28a: left crank web 29: piston pin

30: crank pin 31: connecting rod

32: V-belt continuously variable transmission 33: Gear reducer

40: right transmission case 41: left transmission case

42: rear wheel support case 43: drive pulley

44: driven shaft 45: centrifugal clutch

46: driven pulley 47: stepless V belt

48: pinion gear 49: intermediate shaft

50: gear 51: pinion gear

52: axle 53: gear

60: combustion chamber 61: intake port

61a: combustion chamber side opening 61b: outer opening

62 exhaust port 62a combustion chamber side opening

62b: outer opening 63: intake valve

64 exhaust valve 65 intake pipe

66: air cleaner 67: throttle valve

68: fuel injection valve 69: exhaust pipe

70: muffler 71: valve spring

72: operation valve chamber 73: operation valve device

74: bearing 75: camshaft

76: intake cam 77: exhaust cam

78: intake rocker shaft 79: exhaust rocker shaft

80: intake rocker arm 80a: slide moving part

80b: Contact 81: Exhaust Rocker Arm

81a: slide moving portion 81b: contact portion

82: driven sprocket 83: drive sprocket

84: transmission member storage space 85: stepless chain

86: spark plug

87: left and right crankcase connection screw holes (left crankcase)

88: sealing material (crankshaft outer periphery) 90: auxiliary mechanism base mounting surface

91: left and right crankcase connection bolt

92: left and right crankcase connecting bolt insertion hole

93 crankshaft through-hole 94 support part of bearing 27

95: oil pump shaft support recess 96: inlet oil groove

97: oil groove in the outflow part 98: oil inflow passage

99: oil spill passage

100: oil pump casing attachment screw hole

101: water pump shaft support recess

102: screw hole for attaching the auxiliary mechanism base

110: auxiliary mechanism base 110a: contact surface

110b: Packing Mounting Groove

111, 111A: Bolt for insertion aid base attachment hole

112: through hole of the auxiliary device base 113: ACG stator mounting surface

114: ACG stator mounting screw hole

115: boss portion 116: oil pump shaft support recess

117: water pump shaft support through hole 118: bearing support

119: water pump casing attachment surface 120: water pump casing

120a: Contact surface 120b: Packing mounting groove

121, 121A: Bolt insertion hole for attaching water pump casing

122: screw hole for attaching the water pump casing

123: long bolt 124: coolant inlet

125: cooling water inlet 126: vortex flow path

126A: Swirl flow path cover part 126B: Swirl flow path base part

127: discharge water passage 127A: discharge water passage cover portion

127B: discharge water passage base portion 128: discharge tube

130: oil pump 131: oil pump shaft

132: oil pump drive gear 133: oil pump driven gear

134: inner rotor 135: outer rotor

136: oil pump casing 140: water pump

141: water pump shaft 142: water pump drive sprocket

143: water pump driven sprocket 144: stepless chain

145: bearing 146: impeller

147: sealing material (water pump shaft outer circumference) 150: AC generator

151: Stator 152: Bolt

153: current lead wire 154: rotor

155 fan 156 radiator

The present invention relates to an auxiliary mechanism attachment structure of an internal combustion engine.

It is necessary to attach auxiliary mechanisms, such as a water pump and an oil pump, and an ACG (AC generator) to an internal combustion engine. Conventionally, an auxiliary mechanism base was attached to a crankcase, and an auxiliary mechanism such as a water pump and an oil pump was attached, and an ACG stator base was attached to the periphery of the crankcase to attach an ACG stator (for example, See Patent Document 1). In other words, since the auxiliary mechanism base and the ACG stator base are separate bodies, the number of parts increases and the attachment is not easy. In addition, although the rotation shaft of the auxiliary mechanism is driven from the crank shaft, if both bases are separate as described above, there is a problem such as noise generation because the distance between the shafts cannot be maintained accurately.

(Patent Document 1) Japanese Unexamined Patent Application Publication No. 61-279727 (FIG. 1).

The present invention integrates the ACG stator base into the auxiliary mechanism base to reduce the number of parts, facilitates the attachment work of the auxiliary mechanism and the power transmission system, and maintains the distance between the shafts with high accuracy to reduce noise. The aim is to reduce it.

This invention solves the said subject, The invention of Claim 1 has a crankcase which supports and accommodates a crankshaft, is provided with the opening part which penetrates a crankshaft, and the opening part which penetrates a crankshaft, and is a crankcase. And the attachment surface of the alternator stator, and the attachment portion of the auxiliary mechanism driven by the crankshaft, and the wall portion of the auxiliary mechanism base having a boss portion for supporting the intermediate rotation shaft for power transmission. It relates to an auxiliary mechanism attachment structure of the internal combustion engine, characterized in that consisting of.

In the invention according to claim 2, in the auxiliary mechanism attachment structure of the internal combustion engine according to claim 1, an intermediate rotation shaft for power transmission is disposed on one side of the auxiliary mechanism base, and on the other side of the auxiliary mechanism base, The auxiliary mechanism which rotates with the power transmitted by the intermediate rotary shaft is arrange | positioned. It is characterized by the above-mentioned.

In the invention according to claim 3, in the auxiliary mechanism attachment structure of the internal combustion engine according to claim 2, the intermediate rotation shaft for power transmission is an oil pump shaft and an input member of power from the crankshaft and output of power to the auxiliary mechanism. It is characterized by supporting the member.

1 is a side view of a scooter type motorcycle 1 equipped with an internal combustion engine having an auxiliary mechanism attachment structure of the present invention. In the motorcycle 1, the head pipe 3 is integrally formed at the front end of the vehicle body frame 2, and the front fork 4 is pivotally fitted to the head pipe 3 so as to be pivotable left and right, and the front is mounted. The front wheel 5 is rotatably attached to the lower end of the fork 4. The power unit 6 is attached to the rear part of the vehicle body frame 2 so that it can rock up and down. This rocking type power unit 6 is comprised by the rocker arm type overhead valve-type 4-stroke cycle single cylinder water-cooled internal combustion engine 7, the power transmission device 8, and the rear wheel support 9 integrated. The rear wheel support 9 has a rear wheel 10. Moreover, the rear suspension 11 is sandwiched between the rear part of the vehicle body frame 2 and the rear part of the power unit 6. The article storage part 12 is provided in the upper rear part of the vehicle body frame 2, and the sheet | seat 13 which covers the upper opening of this article storage part 12 so that opening and closing is provided. The fuel tank 15 is arrange | positioned under the step floor 14 of a vehicle body center part. The body frame 2 is covered with a body cover 16.

FIG. 2 is a view of the longitudinal section of the power unit 6 from the left side, and FIG. 3 is an exploded view of a cross section of the plane including the cylinder axis, the crankshaft, the pulley shaft and the tooth shaft of the same power unit 6. The internal combustion engine 7 of this power unit is comprised of the cylinder block 20, the cylinder head 21, the cylinder head cover 22, and the crankcase 23, and is a cylinder block which is oriented substantially in the horizontal direction. The cylinder head 21 is coupled to the front end of the cylinder 20, the cylinder head cover 22 is coupled to the front end of the cylinder head 21, and the crank case 23 is coupled to the rear end of the cylinder block 20. . The crankcase 23 is composed of left and right crankcases 23A and 23B.

In FIGS. 2 and 3, the piston 25 is slidably mounted in the cylinder hole 24 formed in the cylinder block 20, and the bearings 26, which are held in the left and right crankcases 23A and 23B, are mounted. 27, the crankshaft 28 is pivotally supported rotatably. The piston 25 and the crankshaft 28 are pivotally fixed to both ends of the connecting rod 31 by the piston pin 29 and the crank pin 30, respectively, so that the piston 25 may rotate. When reciprocating, the crankshaft 28 is rotationally driven.

The power transmission device 8 in the power unit 6 consists of the V-belt type CVT 32 and the gear reducer 33, and the main body case of the power transmission device 8 is the right transmission case 40. And a left transmission case 41 and a rear wheel support case 42. The right transmission case 40 is manufactured integrally with the left crankcase 23A. The left transmission case 41 is coupled to the right transmission case 40, and the rear wheel support case 42 is coupled to the right transmission case 40.

The drive shaft of the V-belt continuously variable transmission 32 is the crankshaft 28 itself, and the drive pulley 43 of the V-belt continuously variable transmission 32 is provided therein. The driven shaft 44 of the V-belt continuously variable transmission 32 is rotatably supported with the right transmission case 40 and the rear wheel support case 42, and the centrifugal clutch 45 is supported by the driven shaft 44. The driven pulley 46 of the V-belt type continuously variable transmission 32 is provided through. An endless V-belt 47 hangs over the drive pulley 43 and the driven pulley 46. In the V-belt continuously variable transmission 32, when the crankshaft 28 rotates beyond the predetermined rotation speed, the centrifugal clutch 45 is connected, and the driven shaft 44 starts to rotate. When the rotation speed of the crankshaft 28 further increases, the rotational speed of the driven shaft 44 becomes larger than the rotation speed of the crankshaft 28 by the centrifugal force application mechanism of the drive pulley 43. As shown in FIG.

The gear reducer 33 is comprised by the gear group provided in three rotary shafts. The 1st shaft is the driven shaft 44 itself of the V-belt type CVT supported by the right transmission case 40 and the rear wheel support case 42, and the pinion gear 48 is formed. The second shaft is an intermediate shaft 49 rotatably supported by the right transmission case 40 and the rear wheel support case 42, and the gear 50 meshed with the pinion gear 48 of the driven shaft is integrally formed. At the same time, the pinion gear 51 is formed adjacent thereto. The 3rd shaft is the rear wheel shaft 52 rotatably supported by the right transmission case 40 and the rear wheel support case 42, and the gear 53 engaged with the pinion gear 51 of the said intermediate shaft is inserted and mounted. It is. The rear wheel 10 is integrally fixed to the rear wheel shaft 52. By this configuration, the torque of the driven shaft 44 is transmitted to the rear wheel shaft 52 through the pinion gear 48, the gear 50, the intermediate shaft 49, the pinion gear 51 and the gear 53. Since it is transmitted, the rear wheel shaft 52 is decelerated significantly with respect to the driven shaft 44. As shown in FIG.

4 is a view of the longitudinal section of the internal combustion engine 7 seen from the right side. In the figure, arrow F indicates the front of the internal combustion engine, and arrow Up indicates the upward. The combustion chamber 60 is formed in the bottom face of the cylinder head 21 facing the front end of the cylinder hole 24 formed in the cylinder block 20. 3, the spark plug 86 is attached to the cylinder head 21 from the left side of an internal combustion engine so that the electrode of the front end may face the combustion chamber 60, as shown in FIG. In FIG. 4, an intake port 61 is formed in the upper portion of the cylinder head 21, and an exhaust port 62 is formed in the lower portion of the cylinder head 21. An intake valve 63 for opening and closing the combustion chamber side opening 61a of the intake port 61 and an exhaust valve 64 for opening and closing the combustion chamber side opening 62a of the exhaust port 62 are respectively provided in the cylinder head 21. It is fitted so that the slide can be moved.

The downstream end of the intake pipe 65 (FIG. 2) is connected to the outer opening 61b of the intake port 61. The air cleaner 66, the throttle valve 67, and the fuel injection valve 68 are connected to this intake pipe 65 in order from the upstream side (FIG. 2). The upstream end of the exhaust pipe 69 (FIG. 2) is connected to the outer opening 62b of the exhaust port 62, and the downstream end of the exhaust pipe 69 is connected to the muffler 70 (FIGS. 2 and 3). . The intake valve 63 and the exhaust valve 64 (FIG. 4), which are elastically pressurized in the open valve direction by the valve spring 71, are formed of the cylinder head 21 and the cylinder head cover 22. The opening and closing operation is performed by the operation valve device 73 disposed in the operation valve chamber 72 (FIG. 4).

In FIG. 4, one camshaft (located in the V-shaped space fitted by the intake valve 63 and the exhaust valve 64 and directed in the horizontal direction in the horizontal direction through the left and right pair of bearings 74 (FIG. 3) ( 75 (FIG. 3, FIG. 4) is pivotally supported rotatably. The intake cam 76 and the exhaust cam 77 are formed integrally with this camshaft 75 (FIG. 4). It is located forwardly and upwardly from the camshaft 75 so that the intake rocker shaft 78 spans the shaft in the cylinder head 21, and is located below the intake rocker shaft 78 and the exhaust rocker shaft in the cylinder head 21. A reference numeral 79 spans the shaft, and the intake rocker arm 80 and the exhaust rocker arm 81 are pivotally supported on the intake rocker shaft 78 and the exhaust rocker shaft 79, respectively. Slide movement parts 81a and 81a are provided at one end of the intake rocker arm 80 and the exhaust rocker arm 81, and at the other end of the intake rocker arm 80 and the exhaust rocker arm 81, an intake valve ( 63) and contact portions 80b and 81b which contact the top ends of the stem of the exhaust valve 64 are provided.

At the left end of the camshaft 75, a driven sprocket 82 (FIG. 3) is integrally provided. Between the left crank web 28a of the crankshaft 28 and the above-mentioned drive pulley 43, the drive sprocket 83 (FIG. 3) which has the tooth | gear of half the said drive sprocket 82 is integrated. It is fitted with On the left side of the cylinder block 20 and the cylinder head 21, a transmission member accommodation space 84 that connects the drive sprocket 83 and the driven sprocket 82 is provided. Within this space, the drive sprocket ( The endless chain 85 hangs on 83 and the driven sprocket 82. The above is the structure of the operation valve apparatus 73. When the crankshaft 28 rotates, the camshaft 75 is rotationally driven at half the rotation speed, and the intake valve 63 and the exhaust valve are driven by the intake cam 76 and the exhaust cam 77 at a predetermined timing. 64 is opened and closed.

As shown in FIG. 3, FIG. 4, and FIG. 5, the oil pump 130 and the water pump 140 are provided in the lower right part of the internal combustion engine 7. As shown in FIG. 3, the outer shell of the oil pump 130 and the water pump 140 is shown, and the inside is not shown. 4, except for the auxiliary mechanism base 110 (to be described later) forming the outer shell of the oil pump 130 or the water pump 140, the auxiliary appliance base attaching surface exposed to the right side of the right crankcase 23B ( 90 is shown, and a drive mechanism relating to the crankshaft 28, the oil pump shaft 131, the water pump shaft 141, and their shafts is shown at the portion surrounded by the auxiliary mechanism base attachment surface 90. have.

In FIG. 4, an oil pump driving gear 132 is fitted to the crankshaft 28, and an oil pump driven gear 133 engaged with the oil pump driving gear 132 is fitted to the oil pump shaft 131. have. In addition, a water pump drive sprocket 142 is fitted to the oil pump shaft 131, and a water pump driven sprocket 143 is fitted to the water pump shaft 141, and an endless chain 144 is provided to both sprockets. It is wound. When the crank shaft 28 rotates, the oil pump shaft 131 is driven to rotate by the gears 132 and 133, and the water pump shaft 141 by the sprockets 142 and 143 and the endless chain 144. This is driven to rotate. In the above configuration, the oil pump shaft 131 also has a function as an intermediate rotation shaft for power transmission for transmitting power to the water pump shaft 141.

FIG. 5 is an exploded view (V-V cross-sectional exploded view of FIG. 4) passing through the crankshaft 28, the oil pump shaft 131, and the water pump shaft 141 of FIG. 4. In the figure, arrow R is pointing to the right. Left and right crankcases 23A and 23B are joined by bolts 91. The coupling of the left and right crankcases 23A and 23B inserts the bolt 91 into the connection bolt insertion hole 92 of the right crankcase 23B and connects the screw hole 87 for the connection bolt of the left crankcase 23A. It is made by screwing on. The crankshaft 28 is rotatably supported by the left and right crankcase 23A, 23B through the bearing 26, 27.

The oil pump drive gear 132 is fitted to the portion adjacent to the right bearing 27 of the crankshaft 28. An auxiliary mechanism base 110 is attached to the right side of the right crankcase 23B. The stator 151 of the ACG (AC generator) 150 is provided on the ACG stator attaching surface 113 (to be described later with reference to FIG. 8) of the cylindrical protrusion surrounding the crankshaft 28 of the auxiliary mechanism base 110. It is attached by the bolt 152. One of three bolts is shown in the figure. The current take-off line 153 is provided in the stator 151. A rotor 154 of the AC generator 150 is attached to an end of the crankshaft 28 that penetrates the through hole 112 of the auxiliary mechanism base 110, and a fan 155 is provided at a cross section of the same rotor 154. Screw is fixed. This fan 155 is for ventilating to the radiator 156. The sealing member 88 is sandwiched between the through hole 112 and the crankshaft 28 of the auxiliary mechanism base 110.

6 is a right side view of the right crankcase 23B, and FIG. 7 is a VIII-VIII cross-sectional view of FIG. 6. In FIGS. 6 and 7, the left and right crankcase connecting bolts 91 are inserted into the insertion holes 92. An auxiliary mechanism base attaching surface 90 is formed on the right side of the right crankcase 23B. A crankshaft through hole 93 is provided at one end of the portion surrounded by the auxiliary mechanism base attaching surface 90. The crankshaft 28 protrudes to the right side of the crankcase through this through hole 93. The through hole 93 is provided with a support portion 94 (FIG. 7) of the bearing 27.

An oil pump shaft support recess 95 is formed in the center of the portion surrounded by the auxiliary mechanism base attaching surface 90, and an inlet oil groove 96 and an outlet oil groove 97 are formed around it. The oil inflow passage 98 and the oil outflow passage 99 protrude from the periphery of the right crankcase 23B toward these oil grooves 96 and 97 (FIG. 6). An oil pump casing attachment screw hole 100 is provided near the oil grooves 96 and 97.

The water pump shaft support recessed part 101 is formed in the other edge part of the part enclosed by the auxiliary mechanism base attachment surface 90. In the periphery of the auxiliary mechanism base attachment surface 90, an auxiliary mechanism base attachment screw hole 102 for screwing the auxiliary mechanism base 110 attaching bolt described later is provided.

FIG. 8 is a right side view of the auxiliary instrument base 110, FIG. 9 is a left side view (rear side of FIG. 8) of the auxiliary instrument base 110, and FIG. 10 is a sectional view taken along line X-X of FIG. The contact surface 110a which contacts the auxiliary mechanism base attachment surface 90 of the right crankcase 23B is provided in the left surface (FIG. 9) of the auxiliary mechanism base 110, and the packing mounting groove 110b is provided in that surface. Is formed. The auxiliary mechanism base 110 contacts the contact surface 110a to the attachment surface 90 of the right crankcase 23B, and the bolt inserted into the auxiliary mechanism base attachment bolt insertion holes 111 and 111A in the periphery thereof. The screw is inserted into the auxiliary mechanism base mounting screw hole 102 of the right crankcase 23B. The bolt insertion hole 111A is a insertion hole into which the bolt with the water pump case mentioned later is inserted.

A through hole 112 of the auxiliary mechanism base is provided at one end of the auxiliary mechanism base 110, and three ACG stator attachment surfaces 113 and three ACG stator attachment screw holes 114 are provided at the periphery thereof. The ACG stator attachment bolt 152 (FIG. 5) is screwed into this screw hole 114.

The boss | hub part 115 is provided in the center part of the auxiliary mechanism base 110. As shown in FIG. The oil pump shaft support recessed part 116 protrudes in the left surface of the boss | hub part 115 (FIG. 9, FIG. 10). The oil pump shaft 131 is rotatable by the oil pump shaft support recess 95 (FIG. 7) of the right crankcase 23B and the oil pump shaft support recess 116 provided in the boss section 115. Is supported.

A water pump shaft support through hole 117 is provided at the other end of the auxiliary mechanism base 110. The water pump shaft 141 is a bearing 145 inserted and fitted into the water pump shaft support recess 101 of the right crankcase 23B and the bearing support 118 (Fig. 10) of the through hole 117 ( It is rotatably supported through FIG. 5). The water pump casing attaching surface 119 is formed at the end of the auxiliary mechanism base 110. The discharge pipe 128 of the water pump is attached to the end of the portion surrounded by the same attachment surface 119.

11 is a right side view of the water pump casing 120, FIG. 12 is a left side view of the same water pump casing 120 (rear side of FIG. 11), FIG. 13 is a sectional view taken along line III-XIII of FIG. 11, and FIG. XIV-XIV cross-sectional view. On the left side surface (FIG. 12) of the water pump casing 120, a contact surface 120a contacting the water pump casing attachment surface 119 of the auxiliary mechanism base 110 is provided, and the packing mounting groove 120b is provided on the surface thereof. Is formed. Three bolt insertion holes 121 and 121A are provided in the periphery of the water pump casing 120. When attaching the water pump casing 120, the contact surface 120a is brought into contact with the attachment surface 119 of the auxiliary mechanism base 110, and a short bolt is inserted into the two inner bolt insertion holes 121 to assist the The water pump casing 120 is fixed to the auxiliary mechanism base 110 by screwing into a screw hole 122 for attaching the water pump casing provided at a corresponding position of the instrument base 110. The long bolt 123 (FIG. 5) is inserted into the bolt insertion hole 121A, and it inserts into the bolt insertion hole 111A of the corresponding position of the auxiliary | base mechanism base 110, and thereafter, the right crank case 23B. The water pump casing 120, the auxiliary mechanism base 110, and the right crankcase 23B are integrally fixed by screwing into the screw holes 102 at the corresponding positions of the &quot;

At the top of the water pump casing 120, two cooling water inlets 124 and 125 are provided. Moreover, the discharge water passage cover part 127A connected to the vortex flow path cover part 126A is provided in the lower part. This is paired with the vortex flow path base part 126B and the discharge water passage base part 127B (FIG. 8) of the auxiliary mechanism base 110, and become the vortex flow path 126 and the discharge water flow path 127, respectively. The discharged water is sent to the cylinder block 20 through the discharge tube 128 (FIGS. 8, 9, and 10) attached to the auxiliary mechanism base 110.

In FIG. 5, the oil pump shaft is supported by the oil pump shaft support recess 95 of the right crankcase 23B and the oil pump shaft support recess 116 provided in the boss portion 115 of the auxiliary mechanism base 110. 131 is rotatably supported. The oil pump driven gear 133 and the water pump drive sprocket 142 are fixed to the oil pump shaft 131. Adjacent to the right crank case 23B, the inner rotor 134 and the outer rotor 135 of the oil pump 130 are installed on the oil pump shaft 131, and the outside thereof is fixed to the right crank case 23B. The oil pump casing 136 is covering. The oil pump casing 136 is attached to the screw hole 100 provided in the right crankcase 23B with screws.

The water is pumped through the water pump shaft support recess 101 at the end of the right crankcase 23B and the bearing 145 held inside the water pump shaft support through hole 117 at the end of the auxiliary mechanism base 110. The pump shaft 141 is rotatably supported. The water pump driven sprocket 143 is fixed to the water pump shaft 141. An endless chain 144 is wound around the water pump driven sprocket 143 and the water pump drive sprocket 142 fixed to the oil pump shaft 131. The water pump impeller 146 is fixed to the shaft end which protrudes to the right side of the water pump shaft 141, and the water pump casing 120 covers the outer side. Between the impeller 146 and the bearing 145, a sealing material 147 is mounted between the inner surface of the water pump shaft support through-hole 117 of the auxiliary mechanism base 110 and the water pump shaft 141. In the space enclosed by the same sealing material 147, the water pump casing 120, and the inner surface of the water pump shaft support through-hole 117 of the auxiliary mechanism base 110, a vortex flow path 126 (not shown) of the water pump is provided. Formed.

When the crankshaft 28 rotates, the oil pump shaft 131 rotates by the engagement of the oil pump drive gear 132 and the same driven gear 133, and the inner rotor 134 in the oil pump casing 136. By the action of the outer rotor 135, the lubricating oil stored in the inner bottom of the crankcase 23 is sucked from the oil inflow passage 98 (FIG. 6) protruding in the right crankcase 23B, and the oil outflow. It discharges from the passage 99 (FIG. 6), and is supplied to the crankcase 23 and the cylinder head 21. As shown in FIG.

When the oil pump shaft 131 rotates, the water pump shaft 141 is driven by the water pump driven sprocket 143 driven through the endless chain 144 from the water pump drive sprocket 142 of the oil pump shaft 131. By the action of the impeller 146, the reflux cooling water cooled by the radiator 155 is sucked from the cooling water inlets 124 and 125 provided in the water pump casing 120, and the vortex flow passage 126 and the discharge. Through the water passage 127, it is discharged from the discharge pipe 128 attached to the auxiliary mechanism base 110, and supplied again to the cylinder block 20 or the like.

An ACG stator 151 is attached to the auxiliary mechanism base 110. An ACG rotor 152 is attached to the crankshaft 28 and rotates around the stator 151. When the crankshaft 28 rotates, it develops by the interaction of the above, and an electric current is taken out from the electric current take-out line 153 (FIG. 5).

As mentioned above, in the said embodiment, by the same member (auxiliary mechanism base 110), the auxiliary mechanism (water pump 140) and the power transmission system which drives it (oil pump shaft which functions as an intermediate rotary shaft ( 131) and gears, etc.), the number of parts is reduced, the attachment of the auxiliary mechanism and the power transmission system is easy, and since they are supported by the same member, the accuracy of the distance between the axes is improved. Driving noise can be reduced.

Moreover, the power transmission member (oil pump shaft 131 which functions as an intermediate rotary shaft) is arrange | positioned on one side (crankcase side) of the auxiliary mechanism base 110, and the other side of the auxiliary mechanism base 110 is carried out. Since the auxiliary mechanism (main part of the water pump 140) is disposed on the opposite side of the crankcase, the rigid balance is good against the reaction force from the power transmission member, so that the structure with the auxiliary mechanism can be reduced in weight.

In addition, since the oil pump shaft 131 is also used as an intermediate shaft for power transmission, it is possible to arrange a large number of auxiliary mechanisms on the auxiliary mechanism base, and to reduce the size of the internal combustion engine by improving space efficiency.

According to the invention of claim 1, since the auxiliary mechanism and the power transmission system are supported by the same member, the number of parts is reduced, the attachment of the auxiliary mechanism and the power transmission system is easy, and the accuracy of the distance between the axes is improved. Driving noise can be reduced.

According to invention of Claim 2, since rigidity balance is good with respect to the reaction force from a power transmission member, the structure with an auxiliary mechanism can be reduced in weight.

According to the invention of claim 3, the rotating shaft of the specific auxiliary mechanism and the rotating shaft for power transmission are used together. By doing so, the arrangement of a large number of auxiliary mechanisms is facilitated, and the internal combustion engine can be miniaturized by improving space efficiency.

Claims (3)

A crankcase 23 having a crankshaft through hole 93 for supporting and storing the crankshaft 28 and penetrating the crankshaft 28; The contact surface 110a which has the through-hole 112 of the auxiliary mechanism base which penetrates the crankshaft 28, and contacts the attachment surface 90 to the crankcase 23, and the attachment surface 113 of an ACG stator And an attachment surface 90 of an auxiliary mechanism driven by the crankshaft 28, and having a boss portion 115 supporting the intermediate rotation shaft 131 for power transmission in its wall portion. An auxiliary mechanism attachment structure of an internal combustion engine, characterized by comprising an auxiliary mechanism base (110). The power transmission intermediate | middle rotation shaft 131 is arrange | positioned at one side of the auxiliary mechanism base 110, and the said intermediate rotation shaft 131 is located at the other side of the auxiliary mechanism base 110. The auxiliary mechanism attachment structure of an internal combustion engine characterized by the above-mentioned. 3. The power transmission intermediate rotation shaft 131 is an oil pump shaft and supports an input member of power from the crankshaft 28 and an output member of power to the auxiliary mechanism 140. The auxiliary mechanism attachment structure of the internal combustion engine.

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