JP2006250093A - Internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the size of an internal combustion engine and increase the flexibility in the arrangement of auxiliary equipment by shortening the axial dimension of the crankshaft of the internal combustion engine. <P>SOLUTION: This internal combustion engine 11 comprises the crankshaft 28 supported on a crankcase 20, a flywheel magnet 57 interlocked with the crankshaft 28, and the auxiliary equipment 81 interlocked with the crankshaft 28. The flywheel magnet 57 is disposed on an axis 54 parallel with the crankshaft 28 on the radial outer side of the crankshaft 28. An interlocking device 63 interlocking the rotor 61 of the flywheel magnet 57 is installed on the crankshaft 28. The auxiliary equipment 81 is disposed on an axis 82 parallel with the crankshaft 28 on the radial outer side of the crankshaft 28, and the other interlocking device 91 interlocking the auxiliary equipment 81 is installed on the rotor 61 of the flywheel magnet 57. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an internal combustion engine including a flywheel magneto linked to a crankshaft and an auxiliary machine such as a water pump.

  Conventionally, there is an internal combustion engine disclosed in Patent Document 1 below. According to this publication, the internal combustion engine is mounted on the rear part of a vehicle body.

  The internal combustion engine includes a crankcase supported at a rear portion of the vehicle body, a crankshaft supported by the crankcase so as to be rotatable about an axis extending in a longitudinal direction of the vehicle, and an axial direction of the crankshaft. The flywheel magneto is arranged, and a rotor of the flywheel magneto is connected to one end of the crankshaft.

  When the internal combustion engine is driven, the rotor rotates in conjunction with the crankshaft, and the flywheel magneto generates electricity. The electric power generated by this power generation is used as a power source for ignition in the internal combustion engine, thereby continuing to drive the internal combustion engine. The driving force output from the internal combustion engine is transmitted to the driving wheel for traveling through the other end portion of the crankshaft, so that the vehicle can travel.

JP-A-2-109727

  By the way, the vehicle has a narrow excess space. For this reason, it is desired for the internal combustion engine to reduce the dimension of the crankshaft in the axial direction. However, in the internal combustion engine according to the conventional technique, the crankshaft and the flywheel magneto are arranged in the axial direction. For this reason, the internal combustion engine tends to have a large dimension in the axial direction of its crankshaft. Therefore, the internal combustion engine is not preferable when mounted on a vehicle having a small excess space, for example.

  Conventionally, there is an engine in which an auxiliary machine for an internal combustion engine is disposed at any part around the crankshaft, and the auxiliary machine is directly linked to the crankshaft by an interlocking device.

  However, as described above, the flywheel magneto is disposed around the crankshaft, and the space around the crankshaft is narrow. For this reason, the above conventional technique has a problem that the degree of freedom in arranging the auxiliary machine with respect to the crankshaft is low.

  The present invention has been made paying attention to the above situation, and the object of the present invention is to make the internal combustion engine more compact by reducing the dimension in the axial direction of the crankshaft of the internal combustion engine. It is intended to improve the degree of freedom of the arrangement of auxiliary equipment.

  Another object of the present invention is to make the internal combustion engine compact as a whole and to facilitate the assembly operation of the internal combustion engine.

The invention of claim 1 includes a crankshaft 28 supported by the crankcase 20, a flywheel magneto 57 linked to the crankshaft 28, and an auxiliary machine 81 linked to the crankshaft 28. In internal combustion engines,
The flywheel magneto 57 is disposed on the axial center 54 parallel to the crankshaft 28 outside the crankshaft 28 in the radial direction, and the rotor 61 of the flywheel magneto 57 is interlocked to the crankshaft 28. An interlocking device 63 is provided,
The auxiliary machine 81 is arranged on the axial center 82 parallel to the crankshaft 28 outside the crankshaft 28 in the radial direction, and the auxiliary machine 81 is linked to the rotor 61 of the flywheel magneto 57 in an interlocking manner. The interlocking device 91 is provided.

  In the invention of claim 2, in addition to the invention of claim 1, in the axial direction of the crankshaft 28, the interlocking devices 63 and 91 are arranged at substantially the same position, and one side of the interlocking devices 63 and 91 is arranged. On the other hand, the crank arm 35 of the crankshaft 28 and the auxiliary machine 81 are arranged, and the flywheel magneto 57 is arranged on the other side.

  According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, an oil sump portion 100 for accumulating lubricating oil 99 is formed at the inner bottom portion of the internal space 25 formed in the internal combustion engine 11, and the two interlocking operations are performed. The devices 63 and 91 are interlocked with each other, and the lower portion of the other interlocking device 91 is disposed in the oil sump 100.

  According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, the auxiliary machine 81 is a water pump 83, and the water pump 83 is disposed on the axis 82. 84, a bearing 85 for supporting the pump shaft 84 on the crankcase 20 so that the pump shaft 84 can rotate around the shaft center 82, and a positioning tool 86 for positioning the bearing 85 at a predetermined position of the pump shaft 84. The pump shaft 84, the bearing 85, and the positioning tool 86 are formed as an integral assembly 84-86, and the assembly 84-86 can be integrally assembled to the crankcase 20.

  In this section, the reference numerals appended to the above terms are not to be construed as limiting the technical scope of the present invention to the section “Example” described later or the contents of the drawings.

  The effects of the present invention are as follows.

The invention of claim 1 is an internal combustion engine comprising a crankshaft supported by a crankcase, a flywheel magneto linked to the crankshaft, and an auxiliary machine linked to the crankshaft.
The flywheel magneto is disposed outside the crankshaft in the radial direction on an axis parallel to the crankshaft, and an interlocking device for interlockingly connecting the flywheel magneto rotor to the crankshaft is provided.

  Therefore, the size of the internal combustion engine in the axial direction of the crankshaft can be made smaller than that of the conventional internal combustion engine in which the crankshaft and the flywheel magneto are arranged in the axial direction. The engine can be made compact in the axial direction of the crankshaft. Therefore, for example, in a vehicle such as a racing car having a narrow width direction of the vehicle body, when the internal combustion engine is mounted so that the axial direction of the crankshaft matches the width direction of the vehicle body, this mounting can be facilitated and beneficial. .

  In addition, the auxiliary machine is disposed outside the crankshaft in the radial direction on an axis parallel to the crankshaft, and another interlocking device is provided for interlockingly connecting the auxiliary machine to the rotor of the flywheel magneto. ing.

  That is, the auxiliary machine is interlocked and connected to the crankshaft through the above-described interlocking devices. For this reason, the auxiliary machine can be arranged at a desired position around the rotor arranged at a desired position around the crankshaft. Therefore, the degree of freedom in arranging the auxiliary machine with respect to the crankshaft is improved as compared with the case where the auxiliary machine is directly linked to the crankshaft by the interlocking device.

  According to a second aspect of the present invention, the interlocking devices are arranged at substantially the same position in the axial direction of the crankshaft, and a crank arm and an auxiliary machine of the crankshaft are arranged on one side of the interlocking devices. The flywheel magneto is arranged on the other side.

  Here, in general, the rotation trajectory of the crank arm of the crankshaft and the outer diameters of the flywheel magneto are large in function. And compared with this, the external dimension of the said auxiliary machine is comparatively small. In general, the outer diameter dimension of the rotation trajectory of the crank arm of the crankshaft is larger than that of the flywheel magneto.

  Therefore, as described above, the crankshaft and the auxiliary machine of the crankshaft and the flywheel magneto are distributed to the left and right in the axial direction of the crankshaft with respect to each interlocking device. For this reason, each said component of the said internal combustion engine will be arrange | positioned compactly, and the said internal combustion engine can be made compact as a whole.

  According to a third aspect of the present invention, an oil sump for storing lubricating oil is formed at an inner bottom portion of an internal space formed in the internal combustion engine, the two interlocking devices are interlocked to each other, and a lower portion of the other interlocking device is Arranged in the oil sump.

  For this reason, when the internal combustion engine is driven and the interlocking devices are interlocked with each other, first, the other interlocking devices are lubricated by the lubricating oil in the oil reservoir. Next, the lubricating oil that has lubricated the other interlocking device is also supplied to the interlocking device that is interlockingly connected to the other interlocking device, and also lubricates the interlocking device. Therefore, each interlocking device is lubricated by a simple configuration.

  According to a fourth aspect of the present invention, the auxiliary machine is a water pump, and the water pump is disposed in the crankcase so that the pump shaft can be rotated around the shaft center. A bearing to be supported; and a positioning tool for positioning the bearing at a predetermined position of the pump shaft. The pump shaft, the bearing, and the positioning tool are integrally assembled, and the assembled body is integrally formed with the crankcase. Can be assembled to.

  For this reason, in the assembly operation of the water pump to the crankcase in the assembly operation of the internal combustion engine, the assembly is first assembled in a wide working space outside the crankcase, and then the assembly is integrated. And the crankcase. Therefore, the complicated operation of individually assembling the pump shaft and the bearing individually with respect to the crankcase is not necessary, and the assembly operation of the water pump can be facilitated accordingly. That is, the assembly operation of the internal combustion engine can be facilitated.

  An object of the present invention is to reduce the dimension of the crankshaft of the internal combustion engine in the axial direction to make the internal combustion engine more compact and improve the degree of freedom in arranging auxiliary equipment. In order to realize, the best mode for carrying out the present invention is as follows.

  That is, the internal combustion engine includes a crankshaft supported by a crankcase, a flywheel magneto linked to the crankshaft, and an auxiliary machine linked to the crankshaft. The flywheel magneto is disposed outside the crankshaft in the radial direction on an axis parallel to the crankshaft, and an interlocking device for interlockingly connecting the flywheel magneto rotor to the crankshaft is provided. . The auxiliary machine is disposed outside the crankshaft in the radial direction and on an axis parallel to the crankshaft, and another interlocking device for interlockingly connecting the auxiliary machine to the rotor of the flywheel magneto is provided. Yes.

  In order to explain the present invention in more detail, an embodiment thereof will be described with reference to the accompanying drawings.

  2 and 3, reference numeral 1 is a vehicle exemplified as a racing cart, and an arrow Fr indicates the front in the traveling direction of the vehicle 1. Moreover, the right and left mentioned below shall mean the width direction of the vehicle 1 toward the said front.

  A vehicle body 2 of the vehicle 1 is suspended on a body frame 3 constituting the skeleton, a pair of left and right front wheels 4 that are slidably suspended on the front portion of the body frame 3, and a rear portion of the body frame 3. A pair of left and right rear wheels 5, a seat 6 supported in the middle of the vehicle body 2 in the longitudinal direction of the vehicle 1, and a front portion of the vehicle body frame 3, and interlocked with the front wheels 4. A handle 7 and a pair of left and right footrests 8 disposed on the outer side of the seat 6 and supported by the body frame 3 are provided.

  The vehicle 1 is disposed between the seat 6 and the right footrest 8 and is driven by the internal combustion engine 11 that drives the rear wheels 5, and the internal combustion engine 11 includes air 12 and fuel 13 on the atmosphere side. An intake device 14 that can supply an air-fuel mixture and an exhaust device 16 that guides exhaust 15 discharged from the internal combustion engine 11 to the outside of the internal combustion engine 11 are provided. The internal combustion engine 11 is a reed valve type two-cycle single cylinder engine.

  In all the drawings, the stationary member 19 of the internal combustion engine 11 includes a crankcase 20 supported by the vehicle body frame 3, a cylinder 21 protruding upward from the crankcase 20, and a left side surface of the crankcase 20. A case cover 22 is provided so as to be entirely openable and closable. The inside of the crankcase 20 is a crank chamber 24, and a sealed internal space 25 is formed between the crankcase 20 and the case cover 22. The case cover 22 is detachably fixed to the crankcase 20 by a fastener.

  A crankshaft 28 having an axis 27 extending in the width direction of the vehicle 1 is supported by the crankcase 20 so as to be rotatable around the axis 27. A piston 29 is slidably fitted into the cylinder 21, and the crankshaft 28 and the piston 29 are connected to each other by a connecting rod 30. The crankshaft 28 is included in the crank chamber 24 and a pair of left and right crank main shafts 33 and 34 supported by the bearing 32 on the crankcase 20, and is formed integrally with the crank main shafts 33 and 34. A pair of left and right crank arms 35, and a crank pin 36 that is installed on both crank arms 35 and connected to the large end of the connecting rod 30 are provided.

  A space surrounded by the protruding end of the cylinder 21 and the piston 29 is a combustion chamber 38. An intake passage 39 that communicates the inside and outside of the crank chamber 24 is formed in the front portion of the crankcase 20. The intake passage 39 extends in the longitudinal direction of the vehicle 1 and substantially in the horizontal direction. A reed valve 40 that is fitted into the intake passage 39 and attached to the front portion of the crankcase 20 is provided. A scavenging passage 41 for communicating the crank chamber 24 with the combustion chamber 38 is formed in the crankcase 20. Further, an exhaust passage 42 that allows the combustion chamber 38 to communicate with the outside of the cylinder 21 is formed in the cylinder 21.

  The intake device 14 includes a carburetor 44 connected to the front portion of the crankcase 20 and communicating with the intake passage 39, and an intake silencer 45 connected to the carburetor 44. On the other hand, the exhaust device 16 includes an exhaust pipe 46 connected to the rear portion of the cylinder 21 and communicating with the exhaust passage 42, an exhaust pipe muffler 47 and an exhaust silencer 48 sequentially connected to the exhaust pipe 46. Yes. A spark plug 50 is attached to the protruding end of the cylinder 21.

  A driven shaft 53 is provided that extends in parallel with the crankshaft 28 and is disposed radially outward of the crankshaft 28. The driven shaft 53 is supported across the crankcase 20 and the case cover 22 of the stationary member 19 by a bearing 55 so that the driven shaft 53 can rotate around the axis 54.

  A flywheel magneto 57 accommodated in the internal space 25 and disposed on the axis 54 of the driven shaft 53 is provided. The flywheel magneto 57 includes a stator 59 supported by the case cover 22 and a rotor 61 fixed to the driven shaft 53 by a key 60 and rotating together with the driven shaft 53.

  An interlocking device 63 for interlockingly connecting the rotor 61 of the flywheel magneto 57 via the driven shaft 53 to one crank main shaft 33 which is one end of the crankshaft 28 is provided. This interlocking device 63 is accommodated in the internal space 25. The interlocking device 63 includes a drive gear 65 fixed to the crank main shaft 33 by a key 64 and a driven gear 66 that is integrally formed with the driven shaft 53 and meshes with the drive gear 65. The drive gear 65 and the driven gear 66 have the same module and the same number of teeth. As viewed from the line of sight along the axial direction of the crankshaft 28 (FIG. 4), at least a portion of each of the crankshaft 28 and the flywheel magneto 57 overlap each other.

  On the outer peripheral surface of the rotor 61, a protrusion 67 is formed in a part of the circumferential direction. Further, a pulsar coil 68 is provided opposite to the protrusion 67, and the pulsar coil 68 is fixed to the case cover 22.

  A well-known exhaust control valve 69 is provided that can change the height of the upper edge of the opening of the exhaust passage 42 on the combustion chamber 38 side. Further, an auxiliary machine 70 is provided which is accommodated in the internal space 25 and supported so as to straddle the crankcase 20 and the case cover 22 of the stationary side member 19. The auxiliary machine 70 is a governor device that controls the exhaust control valve 69 so that the timing when the exhaust 15 is discharged from the combustion chamber 38 through the exhaust passage 42 is variable. The auxiliary machine 70 is disposed outward in the radial direction of the crankshaft 28. The flywheel magneto 57 and the auxiliary machine 70 are offset from each other in the circumferential direction of the crankshaft 28.

  The auxiliary machine 70 includes a governor shaft 71 that extends in parallel with the crankshaft 28 and is disposed radially outward of the crankshaft 28. The governor shaft 71 is supported across the crankcase 20 and the case cover 22 of the stationary member 19 by a bearing 73 so that the governor shaft 71 can rotate about its axis 72.

  The auxiliary machine 70 is housed in the internal space 25, disposed on the axis 72 of the governor shaft 71, and fixed to the governor shaft 71. A spherical weight 75 to be inserted, a movable body 76 supported by the governor shaft 71 so as to be movable in the axial direction of the governor shaft 71, and the weight 75 through the movable body 76. And a spring 77 to be brought into pressure contact with the inner surface. The exhaust control valve 69 is linked to the movable body 76 by a linked body such as a rotating arm.

  Another interlocking device 79 for interlockingly connecting the governor shaft 71 to one crank main shaft 33 which is one end portion of the crankshaft 28 is provided. This interlocking device 79 is accommodated in the internal space 25. The interlock device 79 includes the drive gear 65 and a driven gear 80 that is fixed to the governor shaft 71 and meshes with the drive gear 65.

  Another auxiliary machine 81 that is interlocked and connected to the crankshaft 28 is provided. The auxiliary machine 81 is a water pump 83 arranged on an axial center 82 extending in parallel with the crankshaft 28 outside the crankshaft 28 in the radial direction. The water pump 83 includes a pump shaft 84 disposed on the shaft center 82 and a pair of left and right supporting the pump shaft 84 on the crankcase 20 so that the pump shaft 84 can rotate around the shaft center 82. A bearing 85, a positioning tool (holding tool) 86 for positioning the bearing 85 at a predetermined position in the axial direction of the pump shaft 84 and holding the bearing 85 at that position, and one end of the pump shaft 84 are fixed by screws, And a rotor 88 fitted into a pump chamber 87 formed in the crankcase 20. The positioning tool 86 includes a circlip and a collar.

  Here, the crankcase 20 is divided into left and right by a flat surface that passes through the pump chamber 87 and extends perpendicular to the crankshaft 28. That is, the crankcase 20 has a split structure composed of left and right members. These two members are integrally joined to each other by joining the two cross sections 20a to each other by a fastener.

  Of the two members of the crankcase 20, a fitting hole 89 is formed on the shaft 82 in the member on the inner space 25 side. The fitting hole 89 penetrates the member on the inner space 25 side of the crankcase 20 from the inner space 25 side toward the pump chamber 87.

  The pump shaft 84, the bearings 85, and the positioning tool 86 are formed as an integral assembly 84-86. The assembled body 84-86 is fitted into the crankcase 20 by being fitted into the fitting hole 89 by a predetermined dimension so as to be integrally fitted and detachable from the inner space 25 side. Further, a stopper 90 that prevents the assembly 84-86 from coming out of the fitting hole 89 is detachably fixed to the surface of the crankcase 20 on the inner space 25 side.

  Still another interlocking device 91 for interlockingly connecting the water pump 83 to the rotor 61 of the flywheel magneto 57 via the driven shaft 53 is provided. The interlocking device 91 is housed in the internal space 25 and includes the driven gear 66 and another driven gear 92 that is fixed to the other end of the pump shaft 84 by a spline and meshes with the driven gear 66. Yes. A surface on the inner space 25 side of the crankcase 20 adjacent to the rear outer peripheral surface of the driven gear 92 has an arc shape centered on the shaft 82 and is brought close to the rear outer peripheral surface of the driven gear 92. Yes.

  The interlocking devices 63, 79, 91 are disposed at substantially the same position in the axial direction of the crankshaft 28, and are interlockedly connected to each other as described above. A crank arm 35 of the crankshaft 28 and a rotor 88 of the water pump 83 are disposed on one side of the interlocking devices 63, 79, 91. In this case, in the axial direction of the crankshaft 28, the crank arm 35 of the crankshaft 28 and the rotor 88 of the water pump 83 are disposed at substantially the same location. Further, the flywheel magneto 57 and the rotating body 74 of the auxiliary machine 70 are disposed on the other side of the interlocking devices 63, 79, 91.

  The other crank main shaft 34, which is the other end portion of the crankshaft 28, serves as an output portion of the internal combustion engine 11. On the axis 27 of the crankshaft 28, a drive side member 95 of the centrifugal clutch 94 is fixed to the other crank main shaft 34. A driven member 96 of the centrifugal clutch 94 is supported on the crank main shaft 34 of the crankshaft 28 on the axis 27 of the crankshaft 28. The driven member 96 is rotatable about the shaft 27 and relative to the crankshaft 28 and the drive member 95. A chain winding type interlocking device 97 for interlockingly connecting the rear wheel 5 to the driven member 96 is provided.

  An oil sump portion 100 for accumulating the lubricating oil 99 is formed at the inner bottom portion of the internal space 25. At least the lower part of the driven gear 92 of the further interlocking device 91 is disposed in the oil reservoir 100 and is bathed by the lubricating oil 99.

  In addition, reference numeral 102 denotes a starter motor, and the crankshaft 28 can be interlocked with the starter motor 102.

  Here, in the assembly operation of the internal combustion engine 11, the operation of assembling the water pump 83 to the crankcase 20 is performed as follows.

  That is, in the state where the crankcase 20 is divided into left and right members and the case cover 22 is not attached to the crankcase 20, the inner space 25 among the left and right members of the crankcase 20. The assembly 84-86 is integrally inserted into the insertion hole 89 formed in the side member from the inner space 25 side by a predetermined dimension. Next, a stopper 90 that prevents the assembled body 84-86 from coming out of the fitting hole 89 is fixed to the crankcase 20.

  Next, a rotor 88 is fitted into the pump chamber 87, and the rotor 88 is fixed by screwing to one end of the pump shaft 84. Further, the driven gear 92 is fixed to the pump shaft 84 from the inner space 25 side. Next, the left and right members of the crankcase 20 are joined together. Thereby, the assembly work of the water pump 83 to the crankcase 20 is completed. Thereafter, the driven gear 92 is fixed to the other end of the pump shaft 84, or the case cover 22 is fixed to the crankcase 20, and the assembly operation of the internal combustion engine 11 is performed.

  For this reason, in assembling the water pump 83 to the crankcase 20, the assembly 84-86 is first assembled in a wide working space outside the crankcase 20, and then the assembly 84-86 is assembled. What is necessary is just to assemble | attach to the said crankcase 20 integrally. Therefore, the complicated operation of individually assembling the pump shaft 84 and the bearings 85 to the crankcase 20 is not necessary, and the assembly operation of the water pump 83 can be facilitated accordingly. That is, the assembly work of the internal combustion engine 11 can be facilitated.

  When the internal combustion engine 11 is driven, the crankshaft 28 is first cranked by driving the starter motor 102. Then, the air 12 outside the internal combustion engine 11 is sucked into the crank chamber 24 through the intake device 14, the reed valve 40, and the intake passage 39. At this time, the fuel 13 is mixed into the air 12 by the carburetor 44 of the intake device 14 to generate an air-fuel mixture, and the air-fuel mixture is pre-compressed in the crank chamber 24.

  Next, the air-fuel mixture passes through the scavenging passage 41 and is sucked into the combustion chamber 38 where it is ignited by the spark plug 50 and burned. The timing of ignition by the spark plug 50 is determined based on an output signal output from the pulsar coil 68 when the projection 67 faces the pulsar coil 68. Combustion gas generated by the combustion is discharged to the outside of the internal combustion engine 11 as exhaust 15 through the exhaust passage 42 and the exhaust device 16.

  Based on the heat energy by the combustion, the crankshaft 28 is rotated A in one direction, and power is output. The driven shaft 53 and the flywheel magneto 57 are interlocked with the crankshaft 28 via the interlocking device 63 and rotated around the shaft center 54. Thereby, the flywheel magneto 57 generates electric power, and the electric power is used as a power source for discharging and controlling the spark plug 50. In this case, the crankshaft 28 and the rotor 61 of the flywheel magneto 57 are reversely rotated A and B.

  Further, the governor shaft 71, the rotating body 74, and the weight 75 of the auxiliary machine 70 are interlocked with the crankshaft 28 via the interlocking device 79 and rotated around the shaft center 72. If the crankshaft 28 is at a high speed, the centrifugal force of the weight 75 interlocking with the crankshaft 28 is increased, and the movable body 76 moves in one axial direction of the governor shaft 71 against the urging force of the spring 77. Moved. If the crankshaft 28 is at a low speed, the centrifugal force of the weight 75 interlocked therewith becomes small, and the movable body 76 is moved in the direction opposite to the one direction by the biasing force of the spring 77. The exhaust control valve 69 is controlled in conjunction with each movement of the movable body 76 described above, and the timing for the exhaust 15 is automatically adjusted.

  The water pump 83 is interlocked with the crankshaft 28 via the interlocking devices 63 and 91, and the pump shaft 84 and the rotor 88 of the water pump 83 are rotated D around the axis 82. As a result, cooling water is discharged from the pump chamber 87, and this cooling water is circulated and cooled in each part of the internal combustion engine 11, and then cooled by air and returned to the suction part of the water pump 83.

  The rear outer peripheral surface of the driven gear 92 of the interlocking device 91 and the inner space 25 side surface of the crankcase 20 adjacent to the rear outer peripheral surface are close to each other. The rear outer peripheral surface of the driven gear 92 rotates D so as to be directed upward. Therefore, the lubricating oil 99 of the oil reservoir 100 is confined between the teeth at the rear portion of the driven gear 92 and is effectively scraped up. Then, the lubricating oil 99 is transferred to the driven gear 66, the drive gear 65, and the driven gear 80 that are sequentially meshed with the driven gear 92, and the gears 65, 66, Lubricate the meshing portions 80 and 92.

  When the crankshaft 28 reaches a predetermined number of times, the centrifugal clutch 94 is connected. Then, the driving force from the crankshaft 28 is transmitted to the rear wheel 5 through the centrifugal clutch 94 and the interlocking device 97, so that the vehicle 1 can travel.

  According to the above configuration, the flywheel magneto 57 is disposed on the axial center 54 parallel to the crankshaft 28 outside the radial direction of the crankshaft 28, and the rotor of the flywheel magneto 57 is disposed on the crankshaft 28. An interlocking device 63 for interlockingly connecting 61 is provided.

  For this reason, the dimension of the internal combustion engine 11 in the axial direction of the crankshaft 28 can be made smaller than that of the conventional internal combustion engine in which the crankshaft and the flywheel magneto are arranged in the axial direction. The internal combustion engine 11 can be made compact in the axial direction of the crankshaft 28. Therefore, in particular, when the internal combustion engine 11 is mounted in the vehicle 1 such as a racing car in which the width direction of the vehicle body 2 is narrow, the axial direction of the crankshaft 28 is matched with the width direction of the vehicle body 2. Easy to do and beneficial.

  Further, the auxiliary machine 81 is arranged on the axial center 82 parallel to the crankshaft 28 outside the crankshaft 28 in the radial direction, and the auxiliary machine 81 is interlocked and connected to the rotor 61 of the flywheel magneto 57. Another interlocking device 91 is provided.

  That is, the auxiliary machine 81 is linked and connected to the crankshaft 28 via the both linkage devices 63 and 91 described above. For this reason, the auxiliary machine 81 can be arranged at a desired position around the rotor 61 arranged at a desired position around the crankshaft 28. Therefore, the degree of freedom of arrangement of the auxiliary machine 81 with respect to the crankshaft 28 is improved as compared with the case where the auxiliary machine 81 is directly linked to the crankshaft 28 by the interlocking device 91.

  As a result, when the internal combustion engine 11 is to be installed in a limited narrow space in the vehicle 1, for example, by arranging the auxiliary machine 81 at a desired position with respect to the crankshaft 28, The external shape of the internal combustion engine 11 can be set to a shape that matches the space. Thereby, the internal combustion engine 11 can be easily mounted on the vehicle 1.

  Further, as described above, the interlocking devices 63, 79, 91 are arranged at substantially the same position in the axial direction of the crankshaft 28, and the crankshaft is disposed on one side of the interlocking devices 63, 79, 91. 28 crank arms 35 and another auxiliary machine 81 are arranged, and the flywheel magneto 57 and auxiliary machine 70 are arranged on the other side.

  Here, in general, the rotation trajectory of the crank arm 35 of the crankshaft 28 and the outer diameters of the flywheel magneto 57 are large in function. In comparison with this, the external dimensions of the auxiliary machines 70 and 81 are relatively small. In general, the outer diameter of the rotation locus of the crank arm 35 of the crankshaft 28 is larger than that of the flywheel magneto 57.

  Therefore, as described above, the crank arm 35 and the other auxiliary machine 81 of the crankshaft 28, the flywheel magneto 57 and the auxiliary machine 70 are connected to the shaft of the crankshaft 28 on the basis of the interlocking devices 63 and 91. The direction is distributed to the left and right. For this reason, each said component 35,57,70,81 of the said internal combustion engine 11 will be arrange | positioned compactly, and the said internal combustion engine 11 is made compact as a whole. Therefore, the internal combustion engine 11 can be more easily mounted on the vehicle 1.

  Further, as described above, the oil reservoir portion 100 for storing the lubricating oil 99 is formed at the inner bottom portion of the internal space 25 formed in the internal combustion engine 11, and the interlocking devices 63, 79, 91 are interlockedly connected to each other. At least the lower part of another interlocking device 91 is disposed in the oil sump 100.

  For this reason, when the internal combustion engine 11 is driven and the interlocking devices 63, 79, 91 are interlocked with each other, first, the other interlocking device 91 is lubricated by the lubricating oil 99 of the oil reservoir 100. Next, the lubricating oil 99 that lubricates the other interlocking device 91 is sequentially supplied to the interlocking devices 63 and 79 that are interlocked and connected to the other interlocking device 91, and also lubricates the interlocking devices 63 and 79. . Therefore, each interlocking device 63, 79, 91 is lubricated by a simple configuration.

  In addition, although the above is based on the example of illustration, the said internal combustion engine 11 may be mounted in vehicles other than a vehicle, and may be used for an industrial machine etc. The internal combustion engine 11 may be a four-cycle internal combustion engine. Further, the positioning tool 86 may be constituted by a fastener.

FIG. 5 is a side sectional view taken along line 1-1 in FIG. 4. 1 is an overall plan view of a vehicle. FIG. 3 is a view taken along line 3-3 in FIG. 2. FIG. 4 is a partially enlarged cutaway view of FIG. 3. FIG. 5 is a cross-sectional view of the other side portion taken along line 5-5 in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Internal combustion engine 20 Crankcase 25 Internal space 28 Crankshaft 35 Crankarm 54 Shaft center 57 Flywheel magneto 61 Rotor 63 Interlocking device 81 Auxiliary machine 82 Shaft 83 Water pump 84 Pump shaft 85 Bearing 86 Positioning tool 84-86 Assembly 87 Pump chamber 88 Rotor 91 Interlocking device 99 Lubricating oil

Claims (4)

In an internal combustion engine comprising a crankshaft supported by a crankcase, a flywheel magneto linked to the crankshaft, and an auxiliary machine linked to the crankshaft,
The flywheel magneto is disposed on an axis parallel to the crankshaft on the outer side in the radial direction of the crankshaft, and an interlocking device for interlockingly connecting the flywheel magneto rotor to the crankshaft is provided.
The auxiliary machine is disposed outside the crankshaft in the radial direction on an axis parallel to the crankshaft, and another interlocking device for interlockingly connecting the auxiliary machine to the rotor of the flywheel magneto is provided. An internal combustion engine characterized by the above.   In the axial direction of the crankshaft, the interlocking devices are arranged almost at the same place, the crankshaft of the crankshaft and auxiliary equipment are arranged on one side of the interlocking devices, and the flywheel is on the other side. 2. The internal combustion engine according to claim 1, wherein a wheel magneto is disposed.   An oil sump for storing lubricating oil is formed at the inner bottom of the internal space formed in the internal combustion engine, the two interlocking devices are interlocked to each other, and the lower part of the other interlocking device is disposed in the oil reservoir. The internal combustion engine according to claim 1 or 2, characterized in that.   The auxiliary machine is a water pump, and the water pump has a pump shaft disposed on its axis, a bearing for supporting the pump shaft on the crankcase so as to be rotatable around the axis, and the bearing A positioning tool that positions the pump shaft at a predetermined position of the pump shaft, and the pump shaft, the bearing, and the positioning tool are formed as an integral assembly, and the assembly can be integrally assembled to the crankcase. The internal combustion engine according to any one of claims 1 to 3, wherein the internal combustion engine is characterized in that:

Images