JP2006077758A - Engine starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric type engine starter, eliminating unnecessary members, providing rational design, and achieving ultimate compactness and light weight. <P>SOLUTION: A battery is disposed on the external, a power accumulating part 110 comprises a rotation support member 112 and 212 to support one end of a spring 111 and 211, and a first gear 113 and 213 is formed in the rotation support member 112 and 212. On an output shaft 133 of a high reduction mechanism 132, a second gear 132b is fixed, and the first and the second gears 113, 213, and 132b are engaged with each other. The power accumulating part 110 and a power transmitting part 120 are disposed on the same first axial line. A compact electric motor and the high reduction mechanism are disposed on the same second axial line that is parallel to the first axial line. The first axial line and the second axial line are disposed on the same plane. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an engine starting device for starting an internal combustion engine using a micro DC electric motor, and in particular, removes a recoil-type driving unit as in the prior art from the device and a battery for driving the electric motor. The present invention relates to an electric engine starter which can be arranged outside the apparatus, and at the same time, the components are most rationally arranged to achieve a reduction in size and weight, and can greatly reduce fatigue during operation of various work machines.

  Most of the engine starters that start small air-cooled gasoline engines mounted on portable work machines such as brush cutters and chainsaws that are widely used at present are recoil-type drive units, engine crankshafts and centrifugal engines. A driven unit connected via a connecting means such as a clutch, and the drive unit and the driven unit are arranged to buffer the driving force of the drive unit and elastically store power between the driven unit and the driven unit. And a buffering / accumulating part having a spring. The recoil type drive unit is arranged between a recoil reel on which a recoil rope is wound, and a recoil reel and a casing, and the inner and outer ends thereof are fixed to the recoil reel and the casing, respectively. When the recoil rope is rotated in one direction by pulling out the recoil rope, the recoil spring is wound up to store the spring force. In this state, when the hand is released from the recoil rope, The stored power of the recoil spring is released and the recoil rope is automatically rewound onto the recoil reel.

  However, the above-described recoil drive unit requires a pulling operation for pulling out the recoil rope every time the engine is started. This recoil rope pulling operation usually requires quick and large pulling, so that a weak person or an elderly person often cannot operate the engine with a single pulling operation. Thus, many proposals have been made to make it easier to start the engine by pulling the recoil rope, and although it has been put into practical use, the complexity of the pulling operation itself remains. On the other hand, the development of small electric motors and batteries in recent years has been remarkable, and even though they have been extremely miniaturized, they have come to have a large capacity. Recently, in order to avoid the complicated operability of the recoil-type starter described above, helped by these circumstances, the electric engine starter that can easily start the engine by a single switch is reviewed and developed. Has been desired.

  This type of electric small engine starting device is, for example, an engine starting device disclosed in Japanese Utility Model Laid-Open No. 63-110672 (Patent Document 1). According to this starting device, a direct current motor powered by a battery, a mainspring spring in which a mainspring barrel is driven by a worm gear fixed to an output shaft of the motor, and an inner end portion of the mainspring spring are fixed. An output rotation shaft, an engine rotation shaft connected to the output rotation shaft via a one-way clutch, a rotation lever for stopping or releasing the rotation of the output rotation shaft, and an output rotation shaft by the lever The interlocking electric switch that is turned on only when the rotation stop of the motor is released, and the motor is driven when the electric switch is turned off, and continues to rotate even when the rotational speed of the motor exceeds the set rotational speed. When the mainspring spring finishes winding, when the speed falls below the set rotational speed, the power supply is cut off and the motor stops rotating. And a armature current control circuit that. Note that a reduction gear may be interposed between the worm gear and the gear formed on the outer periphery of the mainspring barrel.

  Further, for example, according to Japanese Patent No. 2573340 (Patent Document 2), a battery, a DC electric motor driven by the electric power of the battery, a control device for controlling the stoppage of the operation of the motor, and the power of the motor are transmitted. A high reduction ratio reduction mechanism, a spring-spring type energy storage device driven by the high reduction ratio reduction mechanism, and a power transmission device that unilaterally transmits the force of the energy storage device to the crankshaft. A housed spring spring starter is disclosed. The high reduction ratio reduction mechanism includes a first-stage planetary gear reduction device that is arranged on another axis parallel to the crankshaft and is driven by a DC electric motor, and a spring accumulation chamber of the accumulation device A drive gear provided on the output shaft of the planetary gear type reduction gear is meshed with a driven gear provided integrally with the outer periphery of the planetary gear type reduction gear, and the second reduction gear is configured.

  Further, for example, in Japanese Utility Model Laid-Open No. 2-13171 (Patent Document 3), a mainspring barrel can be rotated in one direction via a support system of a planetary gear speed reducer disposed on the side opposite to the crankshaft side of the engine. Is pivotally supported. The rotation of the spring barrel is reduced and rotated by the planetary gear reducer connected through a pair of reduction gears of a small gear and a large gear fixed to the output shaft of a DC electric motor disposed in the housing. . The one-way rotation at this time is performed by the engagement between the ratchet claw and the tooth portion provided on the outer peripheral portion of the mainspring barrel. A starting ratchet wheel and a starting ratchet pawl are arranged on the crankshaft side of the mainspring barrel, and the ratchet wheel is rotatable when the engagement is released. A starter ratchet wheel is assembled to the starting ratchet wheel, and this starter ratchet wheel engages with a centrifugal clutch pawl provided on a crankshaft.

  A ratchet wheel is integrally formed on the outer periphery of the mainspring barrel, and a small-diameter ratchet wheel meshes with the upper end of the mainspring barrel. The rotating shaft fixed to the small-diameter ratchet wheel allows the manual crank to be engaged and disengaged from the outside. During normal engine operation, the manual crank is not inserted and the small-diameter ratchet wheel runs idle. If the engine fails to start and the mainspring is to be re-wound, a manual crank is inserted into the rotary shaft of the small-diameter ratchet wheel, and the mainspring barrel is rotated to store power in the mainspring. When the engine is started, the start ratchet is operated to release the energy stored in the mainspring and rotate the starter ratchet wheel to crank and start the engine.

Further, for example, according to the starter device disclosed in Japanese Patent Application Laid-Open No. 2002-285940 (Patent Document 4), the starter device includes a buffering / accumulating means in the middle of the power transmission system between the driving unit and the driven unit. The drive unit is an electric motor as a drive source, and a speed reduction mechanism is constituted by a worm connected and fixed to an output rotation shaft of the electric motor and a worm wheel provided on the outer periphery of the mainspring barrel. The configuration described above is not substantially different from that of Patent Document 1. The drive side is provided with a recoil-type drive unit separately from the electric motor, and the recoil-type drive unit includes a rope reel wound with a recoil rope and rotated by pulling the recoil rope. And a recoil spring for reversing the rope reel to wind the recoil rope, and a recoil ratchet mechanism for transmitting the rotation of the rope reel to the buffering / accumulating means. The spring barrel can be rotated only in one direction by a one-way clutch. From these configurations, it can be said that the starter of Patent Document 4 is merely a combination of Patent Document 1 and a known recoil mechanism.
Japanese Utility Model Publication No. 63-110672 Japanese Patent No. 2573340 Japanese Utility Model Publication No. 2-13171 JP 2002-285940 A

  By the way, according to the engine starting device of the above-mentioned patent document 1, since the worm gear directly connected to the electric motor and the worm wheel formed on the outer periphery of the mainspring barrel are engaged with each other, the mainspring barrel is rotated in one direction. The mainspring barrel does not reverse, but in such a power transmission mechanism by meshing the worm gear and wormwheel, the output shaft direction of the electric motor and the rotational drive shaft of the mainspring barrel are arranged orthogonally. In terms of design, the efficiency is low (about 60%), and there is a natural limit to downsizing it. Further, in the engine starting device according to Patent Document 1, when the battery runs out or the electric motor fails, the engine starting device itself cannot be operated.

  On the other hand, according to Patent Document 2, a high reduction ratio reduction mechanism is arranged between the electric motor and the mainspring barrel, so that the motor capacity and the battery capacity are 1 / 10.1 / 6 with respect to the cell starter system. It is said that the utility will not be lost even if it is miniaturized as follows and equipped with a small battery. However, the reduction ratio by the high reduction ratio reduction mechanism is set to an extremely large value of 1/250 to 1/300. For this reason, it takes a long time to rotate the mainspring barrel to obtain the required accumulated power in the mainspring spring. Therefore, in this engine starting device, an automatic winding control device for the spiral spring is installed, and the control circuit of the control device automatically performs the accumulating operation of the accumulating spring for each starting operation, and the timer or the spring spring Is detected, the motor is de-energized, and the waiting time during restart is reduced. As a result, the entire apparatus becomes complicated, which inevitably complicates maintenance and increases the price. Of course, the battery is also built in the device, which increases the size of the entire device.

  On the other hand, according to Patent Document 3 described above, when the electric motor stops operating, the mainspring barrel is rotated via the small-diameter ratchet wheel by operating the manual crank, and the mainspring spring is re-wound to rewind the mainspring. By storing the force in the spring and removing the manual crank, and operating the start ratchet, the energy stored in the mainspring spring is released to rotate the starter ratchet wheel and start the engine. However, during the engine rotation, the small-diameter ratchet wheel rotates idly. Moreover, in this patent document 3, since each axis | shaft of an electric motor, a mainspring barrel, the said small diameter ratchet wheel, and a ratchet nail | claw is distribute | arranged mutually parallel, size reduction of an engine starting device is prevented significantly.

  Further, in Patent Document 4, since the mainspring barrel is manually driven in an emergency by a recoil type drive mechanism, the entire apparatus further incorporates an electric motor and its speed reduction mechanism in a conventional recoil type engine starter. In addition, since the speed reduction mechanism is composed of the worm and the worm wheel of the mainspring barrel, the electric motor shaft and the main shaft of the mainspring barrel are orthogonal to each other. difficult.

  The present invention has been made to solve these conventional problems, and its specific purpose is to eliminate unnecessary equipment and to achieve ultimate miniaturization and weight reduction based on a rational design. Further, it is an object of the present invention to provide an electric small engine starting device in which the left and right weight balance of the entire engine when the engine starting device is mounted is equalized and the engine can be started manually.

  The aforementioned object is a basic electric motor driven by a battery, a small electric motor driven by a battery, a power storage unit that transmits the power of the small electric motor through a high speed reduction mechanism in a power storage direction, An engine starter including a power transmission unit that transmits the stored energy of the energy storage unit to the crankshaft of the engine, wherein the battery is disposed outside the device, and the energy storage unit includes one end of the spring and the spring. A first gear is formed on an outer periphery of the rotation support member, a second gear is fixed to an output shaft of the high speed reduction mechanism, and the first and second gears are The power storage unit and the power transmission unit are arranged on the same first axis, and the small electric motor and the high speed reduction mechanism are arranged on the same second axis parallel to the first axis. The small electric motor is arranged on the axis. The second axis is below the first axis and passes through the center of gravity of the entire engine including peripheral devices such as the muffler side and the carburetor side when the engine starter is mounted and the axis of the crankshaft. This is effectively achieved by an engine starter characterized by being arranged on a straight line.

  Here, a spring or a coil spring is used as the spring. When a spring is used, a spring barrel is used as the rotation support member. Moreover, when using a coil spring as a spring, a normal gear can be used as the rotation support member. It is preferable to employ a planetary gear type reduction mechanism as the high reduction mechanism, and it is preferable to employ a spur gear for the first and second gears in combination with the planetary gear.

  According to a further preferred aspect, the rotation control mechanism is provided on the axis of the output shaft of the high speed reduction mechanism and can be engaged with and disengaged from the shaft end of the output shaft and can manually rotate the output shaft. . Normally, rotation of the energy storage unit or the power transmission unit is permitted in the direction of energy storage release, but when the rotation operation mechanism is included, the hand is released from the rotation mechanism when the electric motor is not operating. In order to prevent the spring force accumulated in the energy storage unit from being released, rotation preventing means for preventing rotation in the energy storage releasing direction may be arranged in the energy storage unit or the power transmission unit. In the case where the power transmission unit has an activation pulley connected to the crankshaft through connection / disconnection means, the rotation prevention unit is connected to the outer periphery of the activation pulley that is a part of the component of the power transmission unit. It is preferable that the plurality of ratchet teeth formed on the ratchet teeth and an engaging / disengaging member that engages / disengages with the ratchet teeth.

Effect

  According to the present invention, in order to minimize the number of components that are integrated into the starting device, the recoil-type drive unit is eliminated and the battery is disposed outside the device, and at the same time, the components that are housed in the device are arranged. Design most rationally. Also, assuming that the electric motor cannot be driven, it is possible to start the engine manually in such an emergency. As a result, the entire apparatus can be greatly reduced in size, and at the same time, it is natural to adopt an ultra-miniaturized electric motor or speed reduction mechanism so as to eliminate various problems of the above-mentioned Patent Documents 1 to 4. Then, in addition to reducing the weight of the device, for example, by removing equipment such as batteries and recoil-type drive units that are built into the device, the entire device is miniaturized and at the same time incorporated into the engine equipped with this engine starter It adopts the most rational layout design that can balance the left and right weight of the engine when operating various working machines.

  That is, the battery, the start switch, and the like are not provided in the starter, but for example, these are arranged on the handle that is the operation unit of the work machine, and at the same time, the rotation axis common to the power storage unit, the power transmission unit and the crankshaft Since the first axis that is and the second axis that is the rotation axis of the electric motor and the speed reduction mechanism are arranged in parallel, the axial direction of the starting device and the dimension in the width direction perpendicular to the axis can be shortened. The installation space of the equipment can be made as small as possible. On the other hand, auxiliary devices such as a muffler side and a carburetor side are attached to the engine so as to be distributed to the left and right of the engine body. The muffler side and the carburetor side are not only different in the position of the center of gravity, but also the weight on the carburetor side is higher than that on the muffler side. On the other hand, the engine body has a substantially symmetrical shape, and the position of the center of gravity is on a vertical line that bisects left and right.

  For this reason, the center of gravity of the entire engine is slightly shifted toward the carburetor side with the crankshaft as the center. As a result, when the engine is supported on the crank axis, the engine always has the left and right sides centered on the crankshaft so that the straight line connecting the center of gravity and the crankshaft is a vertical line when the center of gravity in the front-rear direction is ignored. A rotating torque that slightly tilts to one side works. In order to make this rotational torque zero, ideally the center of gravity when the engine starter is mounted should be on a vertical line that divides the engine body into left and right, and the axis of the crankshaft is on that vertical line. The center should come. However, such an ideal arrangement is extremely difficult to realize because various restrictions are imposed on the installation space of the engine starter, for example.

  Therefore, in the present invention, an engine including peripheral devices such as a muffler side and a carburetor side when the engine starter is mounted, with the second axis on which the small electric motor is disposed below the axis of the crankshaft. They are arranged on a straight line passing through the entire center of gravity and the axis of the crankshaft. The electric engine starter according to the present invention is symmetrical, and the position of the center of gravity is also on a vertical line including first and second axes that divide the engine starter into left and right. Therefore, by arranging the small electric motor as described above, the center-of-gravity position of the entire engine when the engine starter is mounted moves to the straight line side. This means that the balance between the left and right sides of the entire engine when the starter is installed improves the feeling of fatigue that occurs during operation of the work implement based on unbalance, with almost no twisting force acting on the hand. And stable work can be continued for a long time. Of course, as the number of devices is reduced, further reduction in size and weight is realized.

  When a planetary gear type speed reduction mechanism is employed as the high speed reduction mechanism, the axis of the input portion and the axis of the output shaft (second axis) can be made coincident with each other and arranged in parallel with the first axis. At the same time, if the first and second gears are spur gears and the first gear of the accumulator and the second gear of the speed reduction mechanism are engaged with each other, the first and second axes are arranged on the same plane. As a result, the space occupied by the devices can be minimized. Further, at the same time, the rotation operation mechanism in an emergency, for example, a rotation operation that can be taken in and out of the shaft end portion of the output shaft of the speed reduction mechanism and the shaft end portion that can be put in and out of the shaft end portion. In particular, it is not necessary to provide a ratchet wheel that is rotated by a manual crank or a recoil-type drive mechanism, which greatly contributes to downsizing of the apparatus.

  The planetary gear speed reduction mechanism as the high speed reduction mechanism can be easily reduced in size, and the reduction ratio of the planetary gear speed reduction mechanism is 1/250 to 1 / If it is set to about 1/50 at most without taking as large as 300, the time required for the engine to start up, that is, the time for the energy storage unit to reach the required energy storage can be shortened.

  As the rotation preventing means, as described above, for example, a plurality of ratchet teeth formed on the outer periphery of the starting pulley connected via a connecting / disconnecting means such as a centrifugal clutch, and an engagement / disengagement member engaging / disengaging with the ratchet teeth If it is a combination, the rotation preventing means can be operated reliably and easily. Similarly, the rotational operation mechanism includes: a detachable portion provided at the shaft end portion of the output shaft of the high speed reduction mechanism; and a rotational operation member that can be taken in and out of the axis and engaged with and detached from the detachable portion of the shaft end portion. If configured, it can be designed so that the same rotation operation member can be inserted into the apparatus from the outside of the apparatus toward the attachment / detachment part of the shaft end part, and its tip is engaged with the attachment / detachment part of the shaft end part By rotating the rotary operation member in the direction of energy storage of the power storage unit, the output shaft of the high speed reduction mechanism rotates and stores power in the power storage unit. At this time, the electric motor also rotates at the same time, but since it has a high reduction ratio, the rotation is slight and the rotational torque is small, and the output shaft of the high reduction mechanism can be easily rotated manually.

  With this configuration, normal engine startup is sufficient to start the electric motor, thereby rotating the power storage unit in the power storage direction via the high speed reduction mechanism and the second gear, and the power storage is sufficient to start the engine. When the maximum load is exceeded, the engine is automatically started. Now, if the battery goes up and the electric motor does not work, even if the output shaft of the speed reduction mechanism is manually operated using the rotation operation mechanism, power is stored in the power storage unit, The engine starts when the accumulated power exceeds the maximum load of the engine. At this time, if the energy storage unit or the power transmission unit is provided with a one-way rotation prevention unit, when the rotation operation mechanism is operated, the rotation of the power storage unit or the power transmission unit in the direction of the energy storage release is prevented. While rotating the output shaft of the high speed reduction mechanism in the direction of power storage of the power storage unit, the required power storage is performed in the power storage unit. When the required power accumulation is performed, the rotation operation mechanism is disconnected and the rotation preventing means is operated to the release side to allow rotation of the energy accumulation section or the power transmission section. Simultaneously with this allowance, the accumulated energy of the energy accumulation unit is released and the engine is started.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an exploded view of an electric engine starting device and an internal combustion engine according to Embodiment 1 of the present invention during assembly. 2-5 is explanatory drawing which shows arrangement | positioning and structure of each structural member of the said engine starting apparatus in the Example 1. FIG. The engine starter 100 of the present invention is applied to a small air-cooled two-cycle gasoline engine or the like, and the starter 100 is disposed close to the input end of the crankshaft 11 of the internal combustion engine 10.

  The engine starter 100 includes a power storage unit 110, a power transmission unit 120, and an electric drive unit 130. The power storage unit 110, the power transmission unit 120, and the electric drive unit 130 are integrally assembled, Housed in a single case 140. The case 140 has a first space A that has a square shape in which the upper half accommodates the accumulator 110 and the power transmission unit 120, and a lower half that gradually narrows toward the lower end that accommodates the drive unit 130. And a second space B having an inverted triangular shape. The first and second case bodies 140a and 140b on the engine side and the anti-engine side have a halved structure.

  The upper half of the first case body 140a on the engine side is a substantially rectangular window 141, and the central part of the lower half is a high speed reduction mechanism 132, which will be described later, which is one of the components of the electric drive unit 130. A speed-reduction mechanism insertion hole 142 for inserting and supporting is formed. Bolt insertion holes 143 are formed inside the four corners of the rectangular window 141 to fix the first case body 140a to the engine 10, and below the upper two corners and the lower two corners of the frame of the rectangular window 141. Are formed with screw holes 144 for coupling to the second case body 140b. On the other hand, a shaft portion 145 protrudes in the center of the inner wall surface of the bottom portion forming the first space A of the second case body 140b on the side opposite to the engine and extends vertically below the coaxial portion 145. A wrench insertion hole 146 that communicates with the internal space is formed in a portion of the back wall portion that forms the second space B corresponding to the center of the speed reduction mechanism fitting insertion hole 142. In addition, bolt insertion holes 147 are formed in the portions of the second case body 140b corresponding to the screw holes 144 of the first case body 140a.

  As shown in FIGS. 1 and 2, the power storage unit 110 includes a spring spring 111 and a spring barrel 112, and a spur gear 113 that is continuous in the circumferential direction is formed in the axial half of the outer peripheral surface of the spring barrel 112. Has been. A through hole 112a is formed at the center of the mainspring barrel 112, and an outer ring of a bearing-like one-way clutch 114 is tightly fitted into the through-hole 112a, and the second case body is fitted to the inner ring of the one-way clutch 114. The shaft portion 145 of 140b is press-fitted and fixed. Further, a spring spring housing space (not shown) is formed on the engine side of the mainspring barrel 112, and the outer end 111a of the spring spring 111 is fixedly fixed to a part of the peripheral wall of the spring spring housing space. An outer end fixing groove (not shown) is formed.

  In the first embodiment, as described above, the mainspring barrel 112 can be rotated only in one direction by the bearing type one-way clutch 114. Instead of the one-way clutch 114, for example, as shown in FIG. A ratchet tooth 115 different from the spur gear 113 is formed on the outer peripheral surface of the spring barrel 112, and a ratchet claw 116 that engages with the ratchet tooth 115 is rotatably supported on a part of the second case body 140b. However, similarly, the mainspring barrel 112 can be allowed to rotate only in one direction. At this time, the ratchet pawl 116 is always urged in a direction to engage with the ratchet teeth 115 by a spring member 117 similarly attached to the second case body 140b. In this case, the mainspring barrel 112 is rotatably supported on the shaft portion 145 via a normal flat bearing 118.

  The power transmission unit 120 includes an activation pulley 121 and an engagement / disengagement member 122 that engages and disengages with the activation pulley 121, as shown in FIGS. A loose insertion hole 121a is formed at the center of the starting pulley 121, into which the shaft portion 145 protruding from the second case body 140b can be loosely inserted. As described above, a spring spring end fixing portion 121b is formed to project toward the mainspring barrel 112 so as to surround the loose insertion hole 121a. The spring spring end fixing portion 121b is formed with an inner end fixing groove 121b 'for engaging and fixing the inner end portion 111b of the spring spring 111. A screw hole (not shown) is formed at the distal end portion of the shaft portion 145. When the assembly is completed, a set screw 148 is screwed into the screw hole, and the power storage portion 110 and the start pulley 121 are connected to the second case body. It is accommodated and fixed to 140b. The axis of the shaft portion 145 is the first axis in the present invention.

  Further, at the engine-side central portion of the start pulley 121, as shown in FIG. 5, an engagement that is an element of a centrifugal clutch mechanism mounted on a fan (not shown) that is integrally attached to the crankshaft 11 of the engine 10 An engaging projection 121c having ratchet teeth 121d is provided on the peripheral surface that engages with the claw 12 to project. The engaging projection 121c is attached to the crankshaft 11 until the maximum load of the engine is exceeded while receiving the energy in the releasing direction generated when the spring barrel 112 rotates and the spring force is stored in the spring 111. When the stored force stored in the mainspring spring 111 exceeds the maximum load of the engine, the engine engages with the engagement claw 12 and starts rotating together. Start. When the engine rotation enters a steady state, the engagement claw 12 is disengaged from the engagement protrusion 121c of the start pulley 121 by the centrifugal force, and the engine rotation is maintained.

  Furthermore, ratchet teeth 123 are formed at a predetermined interval on the outer periphery of the start pulley 121, and the start pulley 121 as a whole constitutes a ratchet wheel. One end 122b of the engagement / disengagement member 122 is rotatably supported by the boss portion 140a-1 of the first case body 140a, and the distal end 122a is rotated by the push button 149 to rotate the outer ratchet teeth of the start pulley 121. 123, the start pulley 121 is allowed to rotate or cannot be rotated. The distal end 122a of the engagement / disengagement member 122 is urged by a torsion spring 150 in a direction away from the ratchet teeth 123 during normal engine start, and the one end 122b is resisted against the urging of the torsion spring 150. Then, the tip 122a can be engaged with the ratchet teeth 123 for the first time by rotating. Here, the engagement / disengagement member 122 and the ratchet teeth 123 of the start pulley 121 correspond to the rotation preventing means in the present invention.

According to the present embodiment, in order to rotate the front end 122a of the engagement / disengagement member 122 against urging, it is attached to a part of the peripheral wall portion of the first case body 140a as shown in FIGS. Further, the ball portion 149 a at the tip of the pin of the push button 149 is fitted to the tip 122 a of the engagement / disengagement member 122, and the engagement / disengagement member 122 resists the bias of the torsion spring 150 by pushing the push button 149. And rotate toward the ratchet teeth 123. By this pushing operation, the push button 149 is locked by a locking means (not shown). Next, when the push button 149 is pulled to the front side, the lock is released and the engagement / disengagement member 122 is disengaged from the ratchet teeth 123. To turn.
Further, the engagement / disengagement member 122 is fixed to the peripheral wall portion of the first case body 140 a by the bias of the torsion spring 150.

  The electric drive unit 130 includes an ultra-small DC electric motor 131 and a high speed reduction mechanism 132 coupled to an output shaft of the electric motor 131, and the high speed rotation of the electric motor 131 causes the high speed reduction mechanism 132 to move. And is transmitted to the mainspring barrel 112. The high speed reduction mechanism 132 includes a small planetary gear mechanism 132a and a spur gear 132b fixed to the output shaft of the planetary gear mechanism 132a. Since the planetary gear mechanism 132a and the spur gear 132b are used in combination as the speed reduction mechanism 132, the input portion and the output shaft can be arranged on the same axis as the second axis of the present invention, The axis line can be arranged in parallel with the shaft portion 145 protruding from the second case body 140b toward the engine side. This is because the present invention completely eliminates the recoil mechanism, and the battery conventionally disposed below the power storage unit 110 and the power transmission unit 120 is disposed outside the case 140, for example, an operation handle (not shown) of the work machine. As a result, by arranging the electric drive unit 130 in the empty space to be formed, the length of the case 140 in the axial direction can be shortened, and the lateral width of the case 140 can be minimized. It is possible to shorten it to the limit.

  Here, in this embodiment, the axis of the electric drive unit 130 is arranged vertically below the shaft unit 145. Strictly speaking, the axis of the electric drive unit 130 is disposed at a position slightly deviated to one side from the vertical plane including the axis of the shaft 145. That is, the straight line L1 formed by connecting the axis of the electric drive unit 130 and the axis of the shaft 145 is not on the vertical line L2, but is rotated by a small angle α around the shaft 145 as shown in FIG. is doing. Specifically, the engine starting device 100 is installed in the engine 10 by slightly tilting the installation posture of the engine starting device 100 with respect to the engine 10 itself. However, in FIG. 3, the small angle α is shown to be large for easy understanding, but is actually a minute angle that cannot be visually recognized.

  By the way, as described above, the rotation axis of the engagement claw 12 of the centrifugal clutch mechanism mounted on the crankshaft 11 of the engine 10 and the rotation center of the start pulley 121 of the power transmission unit 120 are on the first axis. I'm doing it. On the other hand, the axis (second axis) of the electric drive unit 130 can be arranged anywhere around the first axis as long as there is a space. However, in actuality, when considering miniaturization of the apparatus, the installation space for the engine starter, particularly the electric motor thereof, is naturally limited.

  On the other hand, in addition to the engine main body, for example, the muffler 15 side and the carburetor 16 side are disposed in the engine 10 symmetrically with respect to the crankshaft 11 as shown in FIG. However, since the center of gravity position of the muffler 15 side and the carburetor 16 side are different, the center of gravity position of the engine 10 as a whole is slightly deviated from the center of gravity position of the engine body toward the carburetor 16 side. This slight movement of the center of gravity position generates a torque that turns the engine vertically below the center of gravity (in the direction of gravity) when working with a work implement, etc., so that the operation is always twisted. receive. During work, the engine's working posture is maintained against this force. Therefore, a feeling of fatigue is large, and accumulation of the fatigue makes long-time work difficult. On the other hand, the engine starter 100 according to the present invention has a symmetrical shape and structure although there is a slight difference as described above, so that the position of the center of gravity is considered to be on a vertical line that bisects the left and right. Good.

  According to the present embodiment, as described above, the axis line (second axis line) of the electric drive unit 130 is arranged in parallel and vertically below the axis line (first axis line) of the shaft part 145. By arranging the small electric motor 131 in this manner, the position of the center of gravity of the entire engine when the engine starter 100 is mounted moves to a straight line connecting the axis center of the crankshaft 11 and the axis center of the electric motor 131. At the same time, it moves below the center of gravity of the engine 1 when the engine starter 100 is not mounted. Therefore, the balance between the left and right of the entire engine when the engine starter 100 is mounted is improved, and the generation of rotational torque that causes the hand to be twisted during work is almost eliminated, and the feeling of fatigue that occurs during operation of the work machine based on unbalance. Can also be reduced.

  The planetary gear mechanism 132a according to the present embodiment includes first to third internal gears 132a-1 to 132a-3, which are ring-shaped sun gears, and the planetary gear mechanism 132a is the above-described electric part housing case. 134 is accommodated and fixed together with the electric motor 131. That is, a plurality of protrusions 132a'-1 and 132a'-3 extending in parallel with the rotation shaft are provided on the outer peripheral surfaces of the first and third internal gears 132a-1 and 132a-3. In addition, on the inner circumferential surface of the electric part housing case 134, the protrusions 132a'-1, 132a'-3 extend parallel to the axis at the corresponding positions of the protrusions 132a'-1, 132a'-3, and the protrusions 132a'-1, 132a'-3 are fitted. The same number of fitting grooves 134a-1 to be worn are formed.

  In this embodiment, the electric part housing case 134 is formed of a bottomed cylindrical body that opens on the opposite side to the engine side, and is divided into a cylindrical main body 134a and a bottom part 134b. Protrusions 134c and 134d extending in parallel with the axis project from the outer peripheral surface portion of the cylindrical main body 134a and the bottom 134b where the fitting groove 134a-1 is formed, and the protrusion 134d of the bottom 134b. Is formed with a screw hole, and a protrusion 134c of the cylindrical body 134a is formed with a bolt insertion hole. The protrusions 132a′-1 and 132a′-3 of the planetary gear mechanism 132a are fitted into the fitting grooves 134a of the electric part housing case 134 having such a configuration, and the electric motor 131 and the planetary gear mechanism 132a are fitted. Is fixed. The electric part accommodating case 134 that accommodates the electric motor 131 and the planetary gear mechanism 132a is tightly fitted and supported in the electric part close fitting hole 142 formed in the first case body 140a. At this time, the electric motor 131 and the planetary gear mechanism 132a accommodated in the electric part accommodating case 134 expose the output shaft of the planetary gear mechanism 132a to the outside and the fixing frame 135 via bolts and nuts (not shown). And fastened. Thus, the spur gear 132a is fixed to the tip of the output shaft of the planetary gear mechanism 132a housed and fixed in the electric part housing case 134.

  According to the present embodiment, the reduction ratio between the small electric motor 131 and the spring barrel 112 is set to 1/50. The reduction ratio between the spur gear 132b fixed to the output shaft of the planetary gear mechanism 132a and the spur gear 113 formed on the outer periphery of the mainspring barrel 112 is set to 1 / 2.5. Therefore, the reduction ratio of the planetary gear mechanism 132a is set to 1/20. An engagement portion 133a that can be engaged with, for example, a hexagon wrench (not shown) is formed at the output shaft 133 of the planetary gear mechanism 132a, that is, the end of the support shaft of the spur gear 132b, and the second case is formed on the axis. The center of the wrench insertion hole 146 formed in the back wall portion of the body 140b is positioned.

  Now, in order to house and assemble the components according to the present embodiment configured as described above into the case 140, the through hole of the mainspring barrel 112 in which the one-way clutch 114 is closely fitted to the shaft portion 145 of the second case body 140a. Press fit into 112a. At this time, the outer end of the mainspring spring 111 is fixedly engaged with an outer end fixing groove (not shown) formed in the peripheral wall of the mainspring spring accommodating space of the mainspring barrel 112. Next, the inner end portion of the mainspring spring 111 is fixedly engaged with an inner end fixing groove 121b ′ of the mainspring spring end fixing portion 121b formed at the center of the starting pulley 121. Subsequently, after the shaft portion 145 of the second case body 140a is loosely inserted into the loose insertion hole 121a penetrating the mainspring spring end fixing portion 121b, the screw is fixed to the screw hole at the distal end portion of the shaft portion 145. 147 is screwed in, and the assembly of the mainspring barrel 1 and the starting pulley 121 into the second case body 140b is completed.

  On the other hand, when the electric drive unit 130 is assembled to the case 140, the electric motor 131 and the planetary gear mechanism 132a and the spur gear 132b of the speed reduction mechanism 132 are assembled in advance to form an assembly. The protrusions 132a'-1 and 132a'-3 formed on the outer peripheral surface of the planetary gear mechanism 132a of this assembly are fitted into the inner surface of the speed reduction mechanism fitting insertion hole 142 formed in the first case body 140a. The groove 142a is fitted and fixedly supported. Thereafter, the bolt 14 is fastened to the crankcase 13 through four bolt insertion holes 143 formed at the four corners of the rectangular window 141 of the first case body 140a. At the same time, the electric motor 131 is positioned and fixed at a predetermined position of the crankcase 13.

  Thus, after fixing the first case body 140a to the crankcase 13 together with the electric drive unit 130, the bolt 14 is screwed into the screw hole 144 of the first case body 140a via the screw insertion hole 147 of the second case body 140b. As described above, the second case body 140b to which the power storage unit 110 and the power transmission unit 120 are assembled is fixedly integrated with the first case body 140a. When the second case body 140b is fixed to the first case body 140a, the rotating other end 122c of the engagement / disengagement member 122 is engaged with the outer peripheral ratchet teeth 123 of the start pulley 121. When the engagement / disengagement member 122 is pivotally supported by the boss portion 140 a-1, unless the end portion 122 b of the engagement / disengagement member 122 is operated by the torsion spring 150, the front end 122 c is not engaged with the ratchet teeth 123. Energize.

  In the electric engine starting device 100 according to the present embodiment having the above-described configuration, as described above, the case 140 excludes the recoil-type drive unit and the battery as in the conventional case, and the mainspring spring 111 of the power storage unit 110. Is mounted on the same shaft portion 145, and is vertically below the shaft portion 145 and on the axis parallel to the coaxial portion 145 and the electric drive portion 130 on the parallel axis. The electric motor 131 and the planetary gear mechanism 132a and the spur gear 132b constituting the speed reduction mechanism 132 are merely arranged, and the electric motor 131 and the planetary gear mechanism 132a are ultra-small. Therefore, the case 140 can be accommodated in a very compact manner, and as a result, the case 140 itself, that is, the entire starting device can be extremely miniaturized. Theft could be.

  In order to start the engine 10 by the starting device 100 when the battery is in a charged state, for example, when a switch provided on the handle portion is turned on, the electric motor 131 is driven to rotate, and the planetary gear mechanism 132a and the spur gear are driven. The mainspring barrel 112 is rotated in the accumulating direction of the mainspring spring 111 with a reduction ratio of 1/50 by the high speed reduction mechanism 132 including 132b. At this time, the engagement / disengagement member 122 is not engaged with the activation pulley 121 of the power transmission unit 120, and the engagement claw 12 attached to the crankshaft 11 is engaged with the engagement protrusion 121c of the activation pulley 121. It ’s just that.

  Now, in the process in which the mainspring barrel 112 is rotated and accumulating force is applied to the mainspring spring 111, a force to release the accumulating force acts on the mainspring spring 111, and the crankshaft 11 is rotated via the engaging claw 12. While the engine 10 starts to be compressed, the crankshaft 11 cannot be further rotated while the stored force of the mainspring spring 111 is not sufficiently stored to exceed the maximum load in the compression stroke. When the mainspring spring 111 has accumulated force exceeding the maximum load in the compression stroke of the engine 10, the force in the direction of releasing the accumulated force of the mainspring spring 111 is won, and the starting pulley 121 is connected to the crankshaft 11 via the engaging claw 12. And the engine 10 is ignited and the operation is started. When the rotation of the engine 10 enters a steady state, the engagement claw 12 is disengaged from the engagement protrusion 121c of the start pulley 121 by the centrifugal force, and the rotation of the engine is continued. The time required for starting the engine 10 at this time is small because the reduction ratio of the speed reduction mechanism is set to 1/50, which is relatively small, and is almost the same as the start time by a normal cell starter in an automobile or the like. Absent.

  The above describes the starting procedure when the engine starting device 100 is normal. However, according to the present invention, the battery is run up for some reason or the electric motor 131 is driven to rotate due to a failure of the motor itself. When it becomes impossible to start, the engine 10 can be started manually. According to the present embodiment, in the case of an emergency as described above, first, the push button 149 is pressed to engage the engagement / disengagement member 122 with the ratchet teeth 123 of the start pulley 121 against urging. After confirming this engagement, an unillustrated hexagonal wrench, for example, is inserted into a wrench insertion hole 146 formed on the back surface of the case 140, and the engagement formed at the shaft end of the output shaft 133 of the speed reduction mechanism 132. Engage with the part 133a. Next, by rotating the hexagon wrench, the spur gear 132b of the speed reduction mechanism 132 is rotated, and the mainspring barrel 112 is rotated in the accumulating direction. At this time, the small electric motor 131 also rotates slightly. The rotating operation of the hexagon wrench at this time is performed manually, but since the speed reduction mechanism 132 is interposed between the small electric motor 131 and the spring barrel 112, the rotational torque of the small electric motor 131 is small. There is no hindrance to the operation.

  At the time of this wrench operation, since the engaging / disengaging member 122 is engaged with the starting pulley 121 as described above, no force is transmitted between the starting pulley 121 and the crankshaft 11. As a result, the wrench operation can be performed with peace of mind and dedication until sufficient energy is stored in the mainspring spring 111. When the spring spring 111 is sufficiently charged to start the engine, the hexagon wrench is disengaged from the spindle end of the spur gear 132b and is extracted from the wrench insertion hole 146 of the case 140, and the push button 149 is removed. To release the engagement / disengagement member 122 from the ratchet teeth 123 of the start pulley 121. At this time, since the mainspring spring 111 has a sufficient storage force to start the engine 10, the engine starts rotating at the moment when the engagement is released.

  As shown in FIGS. 1 and 2, the energy storage unit 110 includes a spring spring 111 and a spring barrel 112, and a spur gear 113 continuous in the circumferential direction is formed on a half of the outer peripheral surface of the spring barrel 112. Yes. A through hole 112a is formed at the center of the mainspring barrel 112, and an outer ring of a bearing type one-way clutch 114 is tightly fitted into the through hole 112a, and the second case body is fitted to an inner ring of the one-way clutch 114. The shaft portion 145 of 140b is loosely fixed. Further, a spring spring housing space (not shown) is formed on the engine side of the mainspring barrel 112, and the outer end 111a of the spring spring 111 is fixedly fixed to a part of the peripheral wall of the spring spring housing space. An outer end fixing groove (not shown) is formed.

  In the first embodiment, as described above, the mainspring barrel 112 can be rotated only in one direction by the bearing type one-way clutch 114. Instead of the one-way clutch 114, for example, as shown in FIG. A ratchet tooth 115 different from the spur gear 113 is formed on the outer peripheral surface of the spring barrel 112, and a ratchet claw 116 that engages with the ratchet tooth 115 is rotatably supported on a part of the second case body 140b. However, similarly, the mainspring barrel 112 can be allowed to rotate only in one direction. At this time, the ratchet pawl 116 is always urged in a direction to engage with the ratchet teeth 115 by a spring member 117 similarly attached to the second case body 140b. In this case, the mainspring barrel 112 is rotatably supported on the shaft portion 145 via a normal flat bearing 118.

  FIG. 7 shows an exploded view of the engine starting device and the engine according to Embodiment 2 of the present invention during assembly. FIG. 8 is an exploded view showing the main part of the engine starting device. FIG. FIG. 10 is a rear view showing the engagement state of the engagement / disengagement means with respect to the pulley, FIG. 10 is a rear view showing the engagement state of the engagement / disengagement means, and FIG. 11 is a perspective view of the drive pulley as viewed from the front. In the second embodiment, the difference from the first embodiment is an accumulator 210 and a power transmission unit 220 as is clear from FIG. 1, and other engine 10, case 140, and electric drive unit 130. The configuration is not different from that of the first embodiment. For this reason, constituent members other than the power storage unit 210 and the power transmission unit 220 are denoted by the same reference numerals, and the names thereof are not changed.

Therefore, in the following description, the power storage unit 210 and the power transmission unit 220 will be specifically described with reference to FIG.
As shown in FIGS. 7 and 8, the power storage unit 210 according to the second embodiment includes a coil spring 111 and a coil spring end support gear 212, and a circumferential direction is provided on a half of the outer peripheral surface of the coil spring end support gear 212. A spur gear 213 that is continuous with the gear is formed. A through hole 212 a is formed at the center of the coil spring end support gear 212, and an outer ring of a bearing type one-way clutch 214 is tightly fitted into the through hole 212 a, and the first ring is fitted to the inner ring of the one-way clutch 214. The shaft portion 145 of the two case body 140b is press-fitted and fixed. Further, an outer end fixing hole (not shown) for engaging and fixing the one end 211a of the coil spring 211 is formed in a part of the coil spring end supporting gear 212 on the engine side.

  Even in the second embodiment, the coil spring end support gear 212 is allowed to rotate only in one direction via the bearing type one-way clutch 114 as described above. Similarly, instead of the one-way clutch 214, for example, as shown in FIG. 12, ratchet teeth 215 different from the spur gear 213 are formed on the outer peripheral surface of the coil spring end support gear 212, while the second case body 140b. Even if a ratchet pawl 216 that engages with the ratchet teeth 215 is provided on a part of the coil spring end support gear 212, the coil spring end support gear 212 can be allowed to rotate only in one direction. At this time, the ratchet pawl 216 is always biased in a direction to engage with the ratchet teeth 215 by a spring member 217 attached to the second case body 140b. Also in this case, like the first embodiment, the coil spring end support gear 212 is rotatably supported by the shaft portion 145 of the second case body 140b via the normal plain bearing 218.

  On the other hand, as shown in FIGS. 8 to 11, the power transmission unit 220 includes an activation pulley 221 and an engagement / disengagement member 122 that engages / disengages with the activation pulley 221. A loose insertion hole 221a into which the shaft portion 145 protruding from the second case body 140b can be loosely inserted is formed in the central portion of the starting pulley 221, and the central portion of the starting pulley 221 on the non-engine side is illustrated in FIG. As shown in FIG. 2, a spring spring end fixing portion 221b is formed to project toward the coil spring end support gear 212 so as to surround the loose insertion hole 221a. The coil spring end fixing portion 221b is formed with an engaging portion 221b 'for engaging and supporting the other end portion 211b of the coil spring 211, and engages and supports the other end portion 211b. Even in the second embodiment, the axis of the shaft portion 145 is the first axis of the present invention.

  Further, as in the first embodiment, a centrifugal clutch mechanism mounted on a fan (not shown) fixed to the crankshaft 11 of the engine 10 as shown in FIG. An engaging protrusion 221c having ratchet teeth 221d is provided on the peripheral surface that engages with the engaging claw 12 as one element. The engaging protrusion 221c receives the energy in the releasing direction generated in the process in which the coil spring end support gear 212 rotates and the spring force is stored in the coil spring 211, and the crankshaft until the maximum load of the engine is exceeded. 11 is engaged with the engaging claw 12 and is stationary. However, when the accumulated force stored in the coil spring 211 exceeds the maximum load of the engine, the engaging claw 12 remains engaged and rotates together. First, start the engine. When the engine rotation enters a steady state, the engagement claw 12 is disengaged from the engagement protrusion 221c of the start pulley 221 by the centrifugal force, and the engine rotation is continued.

  Further, ratchet teeth 123 are formed on the outer periphery of the start pulley 221 at a predetermined interval, and the start pulley 221 as a whole constitutes a ratchet wheel. One end 122b of the engagement / disengagement member 122 is rotatably supported by the boss portion 140a-1 of the first case body 140a, and the distal end 122a is rotated by the push button 149 so that the outer peripheral ratchet teeth of the start pulley 221 are rotated. 223 is engaged and disengaged, and the rotation of the start pulley 221 is allowed or disabled. The distal end 122a of the engagement / disengagement member 122 is urged by a torsion spring 150 in a direction away from the ratchet teeth 123 during normal engine start, and the one end 122b is resisted against the urging of the torsion spring 150. Then, the tip 122a can be engaged with the ratchet teeth 123 for the first time by rotating. Here, the engagement / disengagement member 122 and the ratchet teeth 223 of the starting pulley 221 correspond to the rotation preventing means in the present invention. Since the operation and operation of the engaging / disengaging member 122 are the same as those in the first embodiment, the description thereof is omitted.

  Now, the electric engine starter 100 according to the second embodiment configured as described above is also free from the conventional recoil drive unit and battery from the case 140, and the coil spring of the accumulator 210 is removed. The coil spring end supporting gear 212 that accommodates 211 and the starting pulley 221 of the power transmission unit 120 are supported by the same shaft portion 145, and an axis line (second axis line) that is vertically below the shaft portion 145 and parallel to the coaxial portion 145. ) And the planetary gear mechanism 132a and the spur gear 132b constituting the speed reduction mechanism 132 can be disposed on the electric motor 131 and the planetary gear mechanism 132a. Since this is used, it can be stored in the case 140 in a very compact manner. As a result, even in the second embodiment, the entire starting device is extremely small. It can be.

  Further, due to the arrangement of the electric motor 131 as described above, the position of the center of gravity of the entire engine when the engine starter 100 is mounted is the axis center of the crankshaft 11 and the axis center of the electric motor 131 as in the second embodiment. , And moves downward from the center of gravity of the engine 1 when the engine starter 100 is not mounted. Therefore, the balance of the left and right of the entire engine when the engine starter 100 is mounted is improved and the position of the center of gravity is lowered, so that there is almost no generation of rotational torque that causes the hand to be twisted during work, and the work machine based on unbalance The feeling of fatigue generated during operation is reduced, and stable work can be continued for a long time.

  The engine 10 can be started by the starter 100 when the battery is in a charged state, for example, by simply turning on a switch provided on the handle portion. However, the engine 10 can be started manually when the battery runs out for some reason or the electric motor 131 cannot be driven and rotated due to a failure of the motor itself. According to the present embodiment, in the case of an emergency as described above, first, the push button 149 is pressed to engage the engagement / disengagement member 122 with the ratchet teeth 223 of the start pulley 221 against the bias. After confirming this engagement, an unillustrated hexagonal wrench, for example, is inserted into a wrench insertion hole 146 formed on the back surface of the case 140, and the engagement formed at the shaft end of the output shaft 133 of the speed reduction mechanism 132. Engage with the part 133a. Next, by rotating the hexagon wrench, the spur gear 132b of the speed reduction mechanism 132 is rotated, and the coil spring end support gear 212 is rotated in the accumulating direction. At this time, the small electric motor 131 also rotates slightly. The rotation operation of the hexagon wrench at this time is manually performed. Since the high speed reduction mechanism 132 is interposed between the small electric motor 131 and the coil spring end support gear 212, the rotation of the small electric motor 131 is performed. The torque is slight and does not hinder the operation.

  At the time of this wrench operation, since the engaging / disengaging member 122 is engaged with the starting pulley 221 as described above, no force is transmitted between the starting pulley 221 and the crankshaft 11. As a result, the wrench operation can be performed with confidence and dedication until the coil spring 211 is sufficiently charged. When the coil spring 211 is sufficiently charged to start the engine in this way, the hexagon wrench is disengaged from the spindle end of the spur gear 132b and removed from the wrench insertion hole 146 of the case 140, and the push button 149 is pulled out. To release the engaging / disengaging member 122 from the ratchet teeth 223 of the starting pulley 221. At this time, since the coil spring 211 has a sufficient storage force to start the engine 10, the engine starts rotating at the moment when the engagement is released.

  As is clear from the above description, according to the electric engine starting device of the present invention, the battery is arranged outside the device and the conventionally known recoil-type drive unit is eliminated, and at the same time, the rational operation member is arranged. In addition, the entire system can be made extremely small and light weight, and as with conventional electric engine starting devices, if the electric motor cannot be driven, the engine can be operated easily and safely by manual operation. Can be started. Furthermore, in the present invention, the arrangement of the electric motor when the engine starter is mounted on the engine is determined in consideration of the position of the center of gravity of the entire engine when the engine starter is mounted. The balance between the left and right is improved, and there is no feeling that the hand is twisted during the operation of the work machine or the like, and a stable operation with less feeling of fatigue during work becomes possible.

It is an exploded view at the time of an assembly of the electric engine starting device and the engine which are Embodiment 1 of the present invention. It is a disassembled perspective view which expands and shows the accumulator, motive power transmission part, and partly electric drive part of the same electric engine starting device. It is the front view seen from the back side when an engagement / disengagement means exists in the said power transmission part. It is the front view seen from the back side when an engagement / disengagement means exists in the said power transmission part in a non-engagement state. It is the perspective view which looked at the drive wheel of a power transmission part from the front side. It is a disassembled perspective view which expands and shows the principal part of the modification in Example 1. FIG. It is an exploded view at the time of the assembly of the electric engine starting device which is Example 2 of this invention and an engine. It is a disassembled perspective view which expands and shows the accumulator, motive power transmission part, and partly electric drive part of the same electric engine starting device. It is the front view seen from the back side when an engagement / disengagement means exists in the said power transmission part. It is the front view seen from the back side when an engagement / disengagement means exists in the said power transmission part in a non-engagement state. It is the perspective view which looked at the drive wheel of a power transmission part from the front side. It is a disassembled perspective view which expands and shows the principal part of the modification in Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine 11 Crankshaft 12 Engagement claw 13 Crankcase 14 Bolt 15 Muffler 16 Carburetor 100 Engine starting device 110 Power storage part 111 Spring spring 111a Outer end part 111b Inner end part 112 Spring main barrel 112a Through hole 113 Outer spur gear 114 One way clutch 115 Ratchet teeth 116 Ratchet claw 117 Spring 118 Plain bearing 120 Power transmission part 121 Start pulley 121a Shaft free insertion hole 121b Spring spring end fixing part 121b 'Inner end fixing groove 121c Engaging protrusion 122 Engaging / disengaging member 122a Tip 122b One end 123 Ratchet teeth 130 Electric starter 131 Ultra-small electric motor 132 High speed reduction mechanism 132a Planetary gear mechanism 132b Spur gears 132a-1 to 132a-3 First to third internal gears
132a'-1, 132a'-3 Projection 133 Output shaft 133a Engagement part 134 Electric part accommodating case 134a-1 Insertion groove 134a Cylindrical part body 134b Bottom part 134c, 134d Projection 135 Fixed frame 140 Case 140a (on the engine side ) First case body 140b (opposite engine side) second case body 141 Window portion 142 Electric portion close fitting holes 143, 147 Bolt insertion hole 144 Screw hole 145 Shaft portion 146 Wrench insertion hole 149 Push button 149a Ball portion 150 Torsion spring 210 accumulator 211 coil spring 211a one end 211b other end 212 coil spring one end support gear 212a through hole 213 outer spur gear 214 one-way clutch 215 ratchet teeth 216 ratchet pawl 217 spring 218 plain bearing 220 power transmission unit 221 start pulley 221a shaft Free insertion hole 221b coil spring End fixing part 221b 'Engaging part 222 Engaging / disengaging member 222a Tip 222b One end 223 Ratchet teeth

Claims (9)

A small electric motor driven by a battery, a power storage unit in which the power of the small electric motor is transmitted in the direction of power storage through a high speed reduction mechanism, and the power stored in the power storage unit is transmitted to the engine crankshaft An engine starter including a power transmission unit for
The battery is arranged outside the device;
The power storage portion includes a spring and a rotation support member that supports one end of the spring, and a first gear is formed on the outer periphery of the rotation support member.
A second gear is fixed to the output shaft of the high speed reduction mechanism,
The first and second gears mesh with each other;
The power storage unit, the power transmission unit, and the crankshaft are arranged on the same first axis, and the small electric motor and the high speed reduction mechanism are on the same second axis parallel to the first axis. Arranged
The second axis on which the small electric motor is arranged is below the first axis, and the center of gravity of the entire engine including peripheral devices such as the muffler side and the carburetor side when the engine starter is mounted and the crank Arranged on a straight line passing through the axis of the axis,
An engine starter characterized by that.   The engine starter according to claim 1, wherein the high speed reduction mechanism includes a planetary gear type speed reduction mechanism.   The engine starter according to claim 1 or 2, wherein the spring is a spring, and the rotation support member is a spring barrel.   The engine starter according to claim 1 or 2, wherein the spring is a coil spring, and the rotation support member is a gear.   The engine starter according to any one of claims 1 to 4, wherein the rotation support member includes a unidirectional rotation means.   The engine starter according to claim 1 or 2, wherein the first and second gears are spur gears.   3. A rotation operation mechanism that is on an output shaft side axis of the high speed reduction mechanism and that can be detached from the shaft end of the output shaft and can manually rotate the output shaft. Engine starter.   Arranged in the energy storage unit or power transmission unit and normally allows rotation of the energy storage unit or power transmission unit in the direction of stored energy release, but prevents rotation in the energy storage release direction when the electric motor is not operating. The engine starting device according to claim 1 or 7, further comprising rotation preventing means.   The power transmission unit has an activation pulley connected to the crankshaft through connection / disconnection means, and the rotation prevention means is associated with a plurality of ratchet teeth formed on the outer periphery of the activation pulley, and the ratchet teeth. The engine starter according to claim 8, further comprising an engaging / disengaging member that is detached.

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