JP4085016B2 - Engine recoil starter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recoil starter for an engine, and more particularly, to an accumulator recoil starter.
[0002]
[Prior art]
As a conventional accumulator recoil starter, for example, there is one described in Patent Document 1. In this prior art, the engine crankshaft is linked to the recoil reel through the input side unidirectional rotation transmission means, the input wheel, the power storage spiral spring, the output wheel, and the output side unidirectional rotation transmission means in this order. Yes. The input wheel is supported by the fixed portion so as to be freely rotated in the forward direction and prevented from being reversed by the reverse rotation preventing means. A locking portion (rotation-side stopper) provided on the crankshaft; a lock lever (fixed-side stopper) that locks the locking portion (rotation-side stopper) and prevents rotation of the crankshaft; Spring winding number measuring means (intermittent gear) for measuring the number of windings of the accumulation spiral spring, and the lock lever (fixed side stopper) when the number of windings of the power accumulation spiral spring reaches the target number of windings Unlocking means (cam) for switching to the unlocking position.
[0003]
In this accumulator type recoil starter, a spiral spring for accumulating power is interposed between the recoil reel around which the starting rope is wound and the crankshaft, and the rotational force is stored in the spiral spring by pulling the starting rope. It has become. When the number of windings of the power storage spiral spring reaches the target number of windings, the unlocking means (cam) switches the lock lever (fixed side stopper) to the unlocked position, and the power accumulation of the power storage spiral spring is increased. The engine is started by rotating the crankshaft.
[0004]
In the recoil starter described in the above-mentioned Patent Document 1, as described in the second column, page 3, column 3, lines 45 to 47, and column 4, lines 10 to 12, the power storage spiral spring is provided. The inner end of the (starter mainspring) is locked to the input wheel (starter spring support member), and the outer end is locked to the outer periphery of the output wheel (starting pulley).
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 07-017810
[0006]
[Problems to be solved by the invention]
However, the recoil starter described in Patent Document 1 has the following problems.
That is, the value of the number of windings of the power storage spiral spring counted by the spring winding number measuring means due to malfunction etc. is smaller than the number of times of actually winding the power storage spiral spring. The operator is usually unaware of such anomalies and pulls the starting rope in the same way as normal. However, in the recoil starter described in Patent Document 1, since the lock lever is not released unless the spring winding number measuring means reaches a position corresponding to the target winding number, the spring winding number measuring means corresponds to the target winding number. Before reaching the position, a situation can occur in which the spiral spring for power accumulation is wound up to the limit.
[0007]
If the spiral spring for power storage is wound up to the limit, the starting rope cannot be pulled any further, and if it is operated forcibly, there is a risk of causing an accident such as failure or breakage.
[0008]
[Means for Solving the Problems]
  In order to solve this problem, the present invention is configured as follows.
  According to the first aspect of the present invention, the recoil reel (1) is connected to the input side one-way rotational transmission means (2), the input wheel (3), the power storage spiral spring (4), the output wheel (5), and the output side. The engine start shaft (7) is interlocked and connected through the one-way rotational transmission means (6) in order,
  The input wheel (3) is supported by the fixed portion (9) so as to be freely rotated in the forward direction and prevented from being reversed by the reverse rotation preventing means (8).
  A locking portion (20) provided on the output wheel (5);
  A lock lever (21) locked to the locking portion (20) to prevent the output wheel (5) from rotating;
  Spring winding number measuring means (11) for measuring the number of windings of the power storage spiral spring (4);
  Unlocking means (12) for switching the lock lever (21) to the unlocked position when the number of windings of the power storage spiral spring (4) reaches the target number of windings;
  In the engine recoil starter with
  A projecting portion (4a) projecting radially outward is provided at an outer end portion of the spiral spring (4) for storing power, and the projecting portion (4a) and a recess (3c) which can be freely engaged and disengaged are provided on the input wheel (3). Formed on the inner peripheral surface of
  Until the stored force of the power storage spiral spring (4) reaches a predetermined amount, the protrusion (4a) engages with the recess (3c), and the input wheel (3) rotates forward to rotate the power storage spiral. The spring (4) is configured to be wound up,
  When the accumulated force of the power storage spiral spring (4) reaches a predetermined amount, the protrusion (4a) is detached from the recess (3c), and the power storage spiral spring (4) is prevented from being wound. Configured toAnd
  Recoil reel ( 1 ) Is the starting rope (34) Spring winding number measuring means based on rotating in the direction of rewinding (11) Spiral spring for power accumulation measured by ( 4 ) Measurement reset means for resetting the count value of the number of windings is provided,
  It is characterized by that.
[0009]
According to a second aspect of the present invention, in the engine recoil starter according to the first aspect, the predetermined amount is set to a value larger than an amount of accumulated force corresponding to a target number of windings of the power storage spiral spring (4). It is characterized by that.
[0010]
According to a third aspect of the present invention, in the engine recoil starter according to the first or second aspect, the spring winding number measuring means (11) is ticked following the rotation of the input wheel (3). A measuring claw wheel (15) is provided, and the measuring claw wheel (15) is configured to measure the number of windings of the power storage spiral spring (4).
[0011]
A fourth aspect of the present invention is the engine recoil starter according to any one of the first to third aspects, wherein a plurality of the recesses (3c) are formed on the inner peripheral surface of the input wheel (3). And
[0012]
[Effects of the invention]
(Invention of Claim 1)
  In the first aspect of the invention, the value of the number of windings of the power storage spiral spring (4) counted by the spring winding number measuring means (11) is actually the power storage spiral spring (4). Even when the value is smaller than the number of times of winding, when the accumulated force of the power-accumulating spiral spring (4) reaches a predetermined amount, the protrusion (4a) is detached from the recess (3c). Since the power storage spiral spring (4) is prevented from being wound, the operator does not notice any abnormality in the spring winding number measuring means (11), and the starting rope is the same as in the normal state. Even if is pulled, the input wheel (3) is idled without being stored in the power storage spiral spring (4). For this reason, it is possible to prevent a situation where the power storage spiral spring (4) is wound up to the limit and the starting rope cannot be pulled.In the first aspect of the present invention, for example, the spring winding number measuring means (11) Spiral spring for power accumulation measured by ( 4 ) The value of the number of windings is actually a spiral spring for power storage ( 4 ) Even if it shows a value less than the number of windings, the starting rope (34) On the other hand, the output wheel ( 5 ) Is unlocked and the stored energy is released, while the starting rope (34) Means for measuring the number of times of spring winding by rewinding (11) Is reset, so the spring winding count measuring means (11) Scales and spiral springs for power storage ( 4 ) It is possible to correct the discrepancy with the actual amount of accumulated energy.
[0013]
When the accumulated force of the power accumulation spiral spring (4) reaches a predetermined amount, the protrusion (4a) is once detached from the recess (3c), but the power accumulation spiral spring (4) is repelled. Because the shape is urged outward to restore the natural length by force, when the protrusion (4a) and the recess (3c) meet by the rotation of the input wheel (3), they will re-engage. Is possible.
[0014]
(Invention of Claim 2)
In the second aspect of the present invention, the predetermined amount is set to a value larger than the amount of accumulated force corresponding to the target number of windings of the power-accumulating spiral spring (4). Is measuring the number of windings of the power storage spiral spring (4) almost accurately, the protrusion (4a) is detached from the recess (3c) and the power storage spiral spring (4) Winding is not prevented. For this reason, every time the starting operation is performed, the operator is not suspicious.
[0015]
(Invention of Claim 3)
When the protrusion (4a) is detached from the recess (3c), the linkage between the input wheel (3) and the spiral spring for power storage (4) is released. Can still rotate. In the third aspect of the present invention, since the number of windings is measured by the measuring ratchet wheel (15) driven by the rotation of the input wheel (3), the protrusion (4a) Even after detachment from the recess (3c), the measuring ratchet wheel (15) can be chopped and fed by the rotation of the input wheel (3) by pulling the starting rope. For this reason, the value of the number of windings of the power accumulation spiral spring (4) measured by the spring winding number measuring means (11) due to a malfunction or the like actually wound the power accumulation spiral spring (4). Even if the value is less than the number of times, if you continue to pull the starting rope, the spring winding number measuring means (11) will eventually reach a position corresponding to the target number of windings and unlock the lock lever (21). Will switch to position. Thereby, it is possible to release the accumulated power.
[0016]
(Invention of Claim 4)
When the protrusion (4a) is detached from the recess (3c), the spiral spring for power storage (4) loses the restraint until then, and releases the accumulated force to restore it to its natural length, and the outer end portion Some rewinding may occur. In such a case, if there is only one recess (3c) on the inner peripheral surface of the input wheel (3), when the protrusion (4a) is detached from the recess (3c), the protrusion ( By the time 4a) meets the recess (3c), there is a possibility that the accumulated force of about one rotation in terms of the number of rotations of the input wheel (3) will be released. However, in the invention according to claim 4, since a plurality of the recesses (3c) are formed on the inner peripheral surface of the input ring (3), the protrusion (4a) is detached from the recess (3c). However, there is a high possibility that the projecting portion (4a) and the recessed portion (3c) are engaged before the accumulated energy is released so much, and the accumulated energy that is wasted can be reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a longitudinal front view of an embodiment of the present invention, FIG. 2A is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 2B is a cross-sectional view taken along line BB in FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1, FIG. 4 is a view with the lock lever 21 removed from FIG. 3, FIG. 5 is a view with the second ratchet pawl 52 removed from FIG. Is a cross-sectional view taken along the line VI-VI in FIG. 3, FIG. 7 is a view of the output-side unidirectional rotational transmission means viewed from the engine side, FIG. 8A is a front view of the input wheel 3, and FIG. 8A is a cross-sectional view taken along the line BB in FIG. 8A, and FIG. 9A is a view of the spring winding number measuring means 11 as viewed from the engine side (however, the lock lever 21 and the first ratchet pawl 51 are omitted). 9 (B) shows the main part of FIG. 9 (A), and shows the movement of the feed claw 14. FIG. 10 shows when the spring winding number measuring means 11 reaches the target number of windings. The state of each part of FIG. 11 is a view of the housed state of the power storage spiral spring 4 inside the input wheel 3 as viewed from the engine side, and shows the state when the starting rope 34 is not pulled. FIG. 12 is a view of the housed state of the power storage spiral spring 4 inside the input wheel 3 as viewed from the engine side, and shows a state immediately before the stored force of the power storage spiral spring 4 reaches a predetermined value. In the present specification, the right side is defined as the front side and the left side is defined as the rear side as viewed in FIG.
[0018]
In FIG. 1, reference numeral 7 denotes a crankshaft of a forced air-cooled four-cycle gasoline engine, and reference numeral 31 denotes a flywheel fan. A starter pulley 32 is provided at one end of the crankshaft 7. The starter pulley 32 is fixed to the crankshaft 7 and rotates integrally with the crankshaft 7.
[0019]
The recoil starter of the present embodiment has a starter case 33 provided on one end side of the crankshaft 7. The starter case 33 has a fixing portion 9 disposed coaxially with the crankshaft 7 inside thereof.
[0020]
The recoil reel 1, the input wheel 3, and the output wheel 5 are externally fitted to the fixed portion 9 in order from the front in a freely rotatable manner. Among these, the starting rope 34 is wound around the recoil reel 1. A reel rewind spiral spring 35 is provided between the recoil reel 1 and the starter case 33. When the start rope 34 is pulled, the reel rewind spiral spring 35 pulls the start rope 34 into the recoil reel 1. It is comprised so that it may rewind. In this specification, as shown in FIG. 2, the direction X in which the recoil reel 1 is rotated by the pulling operation of the starting rope 34 is defined as the forward rotation direction (forward rotation direction).
[0021]
Between the recoil reel 1 and the input wheel 3, as shown in FIG. 2, the input-side unidirectional rotational transmission means 2 is interposed. This input-side unidirectional rotational transmission means 2 is a butt provided on the periphery of the claw 38 provided on the rear end surface (input wheel side end surface) of the recoil reel 1 and the front end surface (recoil reel side end surface) of the input wheel 3. And an edge 39. The pawl 38 is urged outward by a spring (not shown), and when the starting rope 34 is pulled, the pawl 38 and the abutting edge 39 abut against each other, and the rotation of the recoil reel 1 is transmitted to the input wheel 3. When the starting rope 34 is rewound, the abutment between the claw 38 and the abutting edge 39 is released, and the rotation of the recoil reel 1 is not transmitted to the input wheel 3.
[0022]
As shown in FIG. 2, the input wheel 3 is prevented from being reversely rotated by the reverse rotation preventing means 8. The reverse rotation preventing means 8 in this embodiment includes a check claw wheel 24 provided on the fixed portion 9 side and a check claw 25 provided on the input wheel 3 side. The check ratchet wheel 24 is externally fitted to the fixed portion 9 so as not to rotate, and four check engagement portions 41 are extended outward from the central portion thereof. The non-return engaging portions 41 are arranged in a cross shape with an interval of approximately 90 degrees. As shown in FIG. 2 (B), each check engagement portion 41 has a substantially triangular cross section, and escapes the check claw 25 when the input wheel 3 rotates forward (that is, when it rotates in the X direction). And an engaging surface 41b that engages with the check pawl 25 when the input wheel 3 rotates reversely (that is, when rotating in the Y direction). The check ratchet wheel 24 is accommodated in a space between the rear end surface of the recoil reel 1 and the front end surface of the input wheel 3. On the other hand, the check claw 25 is configured to be able to protrude and retract from the front end surface of the input wheel 3 and rotates together with the input wheel 3. In the present embodiment, two check claws 25 are provided. Each check claw 25 is arranged at a point-symmetrical position with the rotation center of the input wheel 3 in between.
[0023]
As a result of such a configuration, when the input wheel 3 tries to rotate forward in the X direction, the check pawl 25 retreats into the input wheel 3 by the escape surface 41a. However, when the input wheel 3 tries to reversely rotate in the Y direction, it engages with the engagement surface 41b of the non-return engaging portion 41 while maintaining the protruding state, thereby preventing the reverse rotation of the input wheel 3. . However, since the check engaging portions 41 are arranged at intervals of 90 degrees, and the check pawls 25 are arranged at point-symmetrical positions with respect to the rotation center of the input wheel 3. In addition, the input wheel 3 can be reversed up to about 90 degrees before the check pawl 25 is engaged with the engagement surface 41b. A known one-way clutch, ratchet mechanism, or the like may be used instead of the reverse rotation preventing means 8 having the above-described configuration.
[0024]
In the recoil starter of the present embodiment, a power storage spiral spring 4 is interposed between the input wheel 3 and the output wheel 5. The power storage spiral spring 4 is accommodated in a space between the input wheel 3 and the output wheel 5, its outer end is locked to the input wheel 3, and its inner end is locked to the output wheel 5. .
[0025]
More specifically, as shown in FIG. 11, a spring accommodating space 3a that opens to the output wheel side is provided inside the input wheel 3, and the spiral spring 4 for storing power is accommodated in the spring accommodating space 3a. The spring accommodating space 3 a is surrounded by a peripheral wall 3 b formed at the outer edge of the input wheel 3. On the inner peripheral surface of the peripheral wall 3b, a concave portion 3c for accommodating the outer end portion of the power storing spiral spring 4 is formed. On the other hand, as shown in FIG. 1, a boss portion 5a is formed on the end surface of the output wheel 5 on the input wheel 3 side, and the output wheel 5 is pivotally supported by the fixing portion 9 via the boss portion 5a. Yes. The boss portion 5a is provided with a locking groove 5b for locking the inner end portion 4b of the power storage spiral spring 4 (see FIG. 11).
[0026]
A projecting portion 4 a projecting outward in the radial direction is provided at the outer end portion of the spiral spring 4 for storing power. In the present embodiment, the protruding portion 4a is formed by folding back the outer end portion of the power storage spiral spring 4 so as to protrude outward. However, it is not limited to such an embodiment. The protrusion 4 a is accommodated in the recess 3 c formed on the inner peripheral surface of the input wheel 3. On the other hand, the inner end portion 4b of the power storage spiral spring 4 is inserted and fixed in a locking groove 5b formed in the boss portion 5a.
[0027]
As shown in FIG. 11, the outermost peripheral portion of the power storing spiral spring 4 accommodated in the spring accommodating space 3 a is in close contact with the inner peripheral surface of the input wheel 3 when the starting rope 34 is not pulled. Therefore, even if the starting wheel is pulled from this state and the input wheel 3 is rotated in the X direction, the protruding portion 4a is not detached from the recessed portion 3c due to the repulsive force of the power storage spiral spring 4, and the protruding portion 4a. And the recess 3c are engaged to wind up the power storage spiral spring 4.
[0028]
Further, when the starting rope 34 is pulled to wind up the power storage spiral spring 4, the amount of power stored in the power storage spiral spring 4 increases. When the amount of accumulated energy exceeds a certain value, the engagement between the protrusion 4a and the recess 3c is released, and the protrusion 4a is detached from the recess 3c. FIG. 12 shows a state immediately before the protruding portion 4a is detached from the recess 3c. In the present embodiment, the protruding portion 4a is detached from the recessed portion 3c when the accumulated amount of the power-accumulating spiral spring 4 becomes a certain value exceeding the accumulated amount corresponding to the target number of windings of the spiral spring 4. It has become.
[0029]
In addition, the protrusion part 4a and the recessed part 3c are comprised so that engagement / disengagement is possible. In other words, when the amount of stored force of the power storage spiral spring 4 exceeds a predetermined value, the protrusion 4a is temporarily detached from the recess 3c, but the external force tries to restore it to its natural length by the repulsive force of the power storage spiral spring 4. Therefore, when the protrusion 4a and the recess 3c meet by the rotation of the input wheel 3, they can be engaged again.
[0030]
Between the output wheel 5 and the crankshaft 7, output-side unidirectional rotation transmission means 6 is interposed. This output side one-way rotation transmission means 6 transmits the rotation of the output wheel 5 to the crankshaft 7, and as shown in FIGS. 1, 3, and 7, the dog claw provided on the output wheel 5 side. 90, a dog claw stand 91 for raising the dog claw 90 when the output wheel 5 rotates, and a claw receiving portion that is provided on the crankshaft 7 side and engages with the dog claw 90 when the dog claw 90 stands up. And 92.
[0031]
The dog claw 90 is pivotally supported on the rear end face of the output wheel 5 so as to be swingable. A dog claw holding portion 93 projects from the rear end surface of the output wheel 5, and the dog claw holding portion 93 restricts the swinging of the dog claw 90 to a certain range, and from the output wheel 5 to the crankshaft 7. The load applied to the dog claw 90 when the rotation is transmitted to is received.
[0032]
The dog claw stand 91 is loosely fitted to a bolt 94 screwed to the rear end portion of the fixed portion 9 and is frictionally brought into contact with the head of the bolt 94 by a spring 95. The dog claw erection tool 91 is provided with an erection guide portion 91a, and when the output wheel 5 rotates, the dog claw 90 is pushed up by the erection guide portion 91a and stands up.
[0033]
The claw receiving portion 92 is formed by cutting and raising the inner peripheral surface of the starter pulley 32. When the dog claw 90 is raised by the dog claw stand tool 91, the claw receiving portion 92 is engaged with the dog claw 90, and the output wheel 5 Is transmitted to the crankshaft 7. The output side unidirectional rotation transmission means 6 functions as follows. That is, the rotation of the output wheel 5 is transmitted to the starting shaft 7 (crankshaft 7), but when the engine starts and the rotational speed of the starting shaft 7 (crankshaft 7) increases, a claw receiving portion 92 is provided on the back of the dog claw 90. Comes into contact with each other and causes the dog claw 90 to fall down, whereby the interlocking connection state between the output wheel 5 and the start shaft 7 (crank shaft 7) is released, and the rotation of the start shaft 7 (crank shaft 7) is transmitted to the output wheel 5. It is supposed not to. In place of the output-side unidirectional rotation transmission means 6 having the above-described configuration, a centrifugal claw that swings due to centrifugal force is provided on the crankshaft 7 side, and a claw receiving portion that engages with the centrifugal claw is provided on the output wheel 5 side. Alternatively, the output-side unidirectional rotational transmission means 6 may be configured by a known centrifugal clutch mechanism (see Patent Document 1).
[0034]
The recoil starter according to the present embodiment is provided with a lock mechanism that prevents the output wheel 5 from rotating. This locking mechanism includes a locking portion 20 provided on the output wheel 5 and a lock lever 21 that is detachable from the locking portion 20. The locking portion 20 is configured as a convex portion provided on the rear end surface of the output wheel 5. This convex part is provided in the periphery of the rear-end surface of the output wheel 5 at equal intervals. As shown in FIGS. 3 to 5, in this embodiment, six locking portions 20 are provided.
[0035]
On the other hand, the lock lever 21 is pivotally supported by a first pivot shaft 47 fixed to the starter case 33. The lock lever 21 is configured to be switchable between a lock position and a lock release position. When the lock lever 21 is in the lock position, the lock lever 21 is locked with the locking portion 20 to prevent the output wheel 5 from rotating. When the lock lever 21 is in the unlocked position, the locking portion 20 is released to allow the output wheel 5 to rotate. The first pivot shaft 47 is installed in the starter case 33 in the front-rear direction.
[0036]
The lock lever 21 is urged in the lock position direction by the lock position urging means 48. The lock position urging means 48 in this embodiment is constituted by a tension spring. One end of the tension spring 48 is engaged with the starter case 33 side, and the other end is engaged with the lock lever 21.
[0037]
The lock lever 21 includes an arm portion 21a. The arm portion 21a extends toward a second pivot shaft 57, which will be described later, and is suspended from the second pivot shaft 57 when the lock lever 21 swings. The arm portion 21a is suspended on the second pivot shaft 57, thereby restricting the rocker 21 from swinging more than a certain amount in the lock position direction.
[0038]
The arm 21a of the lock lever 21 is provided with a passive portion 21b extending downward. The lock lever 21 comes into contact with and receives the unlocking means 12 described later in the passive portion 21b.
[0039]
The recoil starter according to the present embodiment includes spring winding number measuring means 11 that measures the number of windings of the power storage spiral spring 4. The spring winding number measuring means 11 includes a feed claw 14 provided on the input wheel 3, a measurement claw wheel 15 chopped and fed by the feed claw 14, and a remaining claw that rotates integrally with the measurement claw wheel 15. The vehicle 50 includes a first ratchet claw 51 and a second ratchet claw 52 that are engaged with the remaining claw wheel 50.
[0040]
Among these, the feed claw 14 provided in the input wheel 3 is configured as follows. That is, as shown in FIGS. 8 and 9, the feed claw 14 is provided on the outer peripheral surface of the input ring 3, is pivotally supported in a undulating manner, and is radially outward of the input ring 3 by the torsion spring 55. It is energized towards. When the input wheel 3 rotates in the direction X in which the power-accumulating spiral spring 4 stores power (that is, when the input wheel 3 is rotating forward), the feed claw 14 stands up and a measurement claw wheel described later. When the input wheel 3 rotates in the opposite direction Y, while the feed wheel 15 is fed in increments of 15, the feed claw 14 is configured to fall on contact with the measuring claw wheel 15.
[0041]
The measurement claw wheel 15 and the remaining claw wheel 50 are pivotally supported by a second pivot shaft 57 fixed to the starter case 33. The measurement claw wheel 15 and the remaining claw wheel 50 are configured to rotate integrally. The second pivot shaft 57 is installed in the starter case 33 in the front-rear direction so as to be substantially parallel to the first pivot shaft 47.
[0042]
In this embodiment, as shown in FIG. 2, since the two feed claws 14 are provided on the outer peripheral surface of the input wheel 3, the measuring wheel 15 is fed in increments of two claws by one rotation of the input wheel 3. Is done.
[0043]
The remaining claw wheel 50 is provided with unlocking means 12. The lock release means 12 is configured to release the lock mechanism when the number of windings of the power storage spiral spring 4 reaches the target number of windings. That is, the unlocking means 12 rotates together with the remaining claw wheel 50 (and the measurement claw wheel 15), and when the measurement claw wheel 15 is cut by the feed claw 14 and reaches the target number of windings. In addition, it abuts on and drives a passive portion 21b provided on the lock lever 21 to switch the lock lever 21 from the locked position to the unlocked position. In the present embodiment, the lock release means 12 is configured as a pin implanted in the remaining claw wheel 50, but may be formed integrally with the remaining claw wheel 50. Also, the unlocking means 12 may be provided in the measuring ratchet 15.
[0044]
The first ratchet pawl 51 and the second ratchet pawl 52 are pivotally supported by the first pivot shaft 47, and the first ratchet pawl 51, the second ratchet pawl 52, and the lock lever 21 from the front of the recoil starter. Are arranged side by side. Among these, the first ratchet pawl 51 is biased by the tension spring 61 in a direction to be locked to the remaining pawl wheel 50. One end of the tension spring 61 is locked to the first ratchet pawl 51, and the other end is locked to the starter case 33 side.
[0045]
On the other hand, the second ratchet pawl 52 is urged by a tension spring 62 in a direction to be engaged with the remaining pawl wheel 50. One end of the tension spring 62 is engaged with the second ratchet pawl 52, and the other end is engaged with the lock lever 21 (see FIGS. 3 and 4). The second ratchet pawl 52 is also provided with an input portion 52a. The input portion 52a causes the lock lever 21 to swing by engaging with a notch portion 21c provided in the lock lever 21. This is transmitted to the ratchet pawl 52. That is, when the lock release means 12 contacts the passive portion 21b of the lock lever 21 and pushes it, the lock lever 21 is swung from the lock position to the lock release position. The second ratchet pawl 52 is transmitted to the second ratchet pawl 52 through the engagement between the notch portion 21c and the input portion 52a, and the second ratchet pawl 52 and the remaining pawl wheel 50 are swung upright. Release the lock. Further, when the lock lever 21 is in the unlock position, the second ratchet pawl 52 also releases the engagement with the remaining pawl wheel 50 through the engagement between the input portion 52a and the notch portion 21c. Maintain stop release posture. On the other hand, when the lock lever 21 is switched from the unlocked position to the locked position, the second ratchet pawl 52 is also interlocked with the remaining ratchet wheel 50 via the input portion 52a.
[0046]
In the recoil starter of the present embodiment, the total number of windings of the vortex spring 4 for storing power measured by the spring winding number measuring means 11 based on the rotation of the recoil reel 1 in the direction of rewinding the starting rope 34 is calculated. A measurement reset means for resetting the numerical value is provided. This measurement resetting means is provided on the initial position biasing means 71 for biasing the measuring ratchet wheel 15 to the initial position, the reset main driving part 72 provided on the recoil reel 1, and the first ratchet pawl 51. The reset follower 73 is provided.
[0047]
Among these, the initial position urging means 71 is configured as a first torsion spring wound around the second pivot shaft 57 as shown in FIGS. 1 and 6. One end is fixed to the starter case 33 side, and the other end is fixed to the measuring claw wheel 15. The initial position biasing means 71 moves the measuring ratchet wheel 15 to the initial position when both the first ratchet pawl 51 and the second ratchet pawl 52 are unlocked from the remaining pawl wheel 50. To rotate back. As shown in FIGS. 3 to 5, the bracket 76 provided on the starter case 33 restricts the rotation return of the measuring wheel 15 by the initial position biasing means 71 beyond a certain level. The position where 76 and measurement claw wheel 15 abut is determined as the initial position of measurement claw wheel 15.
[0048]
The reset main driving portion 72 is configured as a convex portion that protrudes from the periphery of the rear end surface of the recoil reel 1 at substantially equal intervals. On the other hand, the reset follower 73 is configured as the other end portion of the second torsion spring 78 whose one end is locked to the first ratchet pawl 51, and the other end portion is an open end. The second torsion spring 78 is wound around the first pivot shaft 47 and extends downward at its release end, which functions as a reset follower 73, for resetting when the recoil reel 1 is rotated. It abuts on the main moving part 72 and receives its drive. As a result, the rotation of the recoil reel 1 is transmitted to the first ratchet pawl 51 through the contact between the reset driving unit 72 and the reset driven unit 73. However, at the time of forward rotation X of the recoil reel 1, even if the reset main driving portion 72 comes into contact with and drives the reset driven portion 73, this driving force is transmitted via the second torsion spring 78 to the first. The ratchet pawl 51 acts in a direction to lock the remaining ratchet wheel 50, so that the locking of the first ratchet pawl 51 and the remaining hook wheel 50 is maintained. When the recoil reel 1 rewinds and rewinds the starting rope 34, the reset main driving portion 72 drives the reset driven portion 73 to cause the first ratchet pawl 51 to oscillate, so that the first ratchet The engagement between the claw 51 and the remaining claw wheel 50 is released.
[0049]
The recoil starter according to the embodiment of the present invention operates as follows.
Now, assume that the engine is stopped and the engine is to be started (see FIGS. 3 to 5). It is assumed that no power is stored in the power storage spiral spring 4 and the starting rope 34 is wound around the recoil reel 1. At this time, the measuring wheel 15 is in the initial position, the lock lever 21 is locked to the locking portion 20, and the output wheel 5 is locked. Further, the first ratchet pawl 51 and the second ratchet pawl 52 are locked to the remaining pawl wheel 50 by the urging force of the tension spring 61 and the tension spring 62, respectively.
[0050]
In this case, when the starting rope 34 is pulled, the output wheel 5 is locked, so that the power accumulation to the power storing spiral spring 4 is started. That is, the pulling operation of the starting rope 34 causes the recoil reel 1 to rotate in the normal rotation direction X, and the rotation of the recoil reel 1 rotates the input wheel 3 via the input-side unidirectional rotation transmission means 2. On the other hand, since the output wheel 5 is locked, the power storage spiral spring 4 is wound up by the amount of rotation of the input wheel 3.
[0051]
Such rotation of the input wheel 3 is transmitted to the measurement claw wheel 15 by the feed claw 14 and feeds the measurement claw wheel 15 in steps. At this time, since the first ratchet pawl 51 and the second ratchet pawl 52 are engaged with the remaining pawl wheel 50 that rotates integrally with the measurement pawl wheel 15, It is left in each counting position corresponding to the count value, and the number of windings of the power storage spiral spring 4 can be accurately counted.
[0052]
When the number of windings of the power storage spiral spring 4 reaches the target number of windings, the unlocking means 12 pushes the passive portion 21b provided on the arm portion 21a of the lock lever 21 to move the lock lever 21 from the locked position. Switch to the unlock position (see FIG. 10). As a result, the restraint of the output wheel 5 is released, and the stored force stored in the spiral spring 4 for storing power is released, and the output wheel 5 rotates. The rotation of the output wheel 5 is transmitted to the crankshaft 7 by the output-side unidirectional rotation transmission means 6 to start the engine.
[0053]
When the engine is started and the rotational speed of the crankshaft 7 is increased, the claw receiving portion 92 comes into contact with the back surface of the dog claw 90, thereby causing the dog claw 90 to fall down and connecting the output wheel 5 and the crankshaft 7. I will be refused.
[0054]
On the other hand, the second ratchet pawl 52 swings up and down in conjunction with the switching of the lock lever 21 from the locked position to the unlocked position, and the second ratchet pawl 52 and the remaining pawl wheel 50 are locked. Is released. When the rewinding operation of the starting rope 34 has not started, the lock release means 12 is pushing up the lock lever 21 via the passive portion 21b, so that the lock lever 21 is unlocked by the lock release means 12. In addition, the second ratchet pawl 52 continues to take the unlocking posture in which the locking with the remaining pawl wheel 50 is released (see FIG. 10).
[0055]
Next, the rewinding operation of the starting rope 34 is started from this state. That is, the recoil reel 1 starts to rotate in the direction Y in which the starting rope 34 is rewound by the reel rewinding spiral spring 35. Due to the reverse rotation of the recoil reel 1, the reset main drive portion 72 drives the reset follower portion 73, and this driving force is transmitted to the first ratchet pawl 51 via the second torsion spring 78, thereby swinging it. The first ratchet pawl 51 and the remaining pawl wheel 50 are unlocked by being raised.
[0056]
As a result, the measuring wheel 15 is returned to the initial position by the biasing force of the initial position biasing means 71. In conjunction with this, the lock release means 12 also rotates and moves away from the lock lever 21. As a result, holding of the lock lever 21 in the unlocked position by the unlocking means 12 is released, and the lock lever 21 is switched to the locked position by the spring force (and its own weight) of the tension spring 48 serving as the lock position biasing means. In conjunction with this, the second ratchet pawl 52 is also locked to the remaining pawl wheel 50.
[0057]
Thus, in the present embodiment, the lock lever 21 is switched from the unlocked position to the locked position in conjunction with the reset value of the spring winding number measuring means 11 being reset by the measurement resetting means. Yes. For this reason, not only the unlocking of the output wheel 5 but also the locking is automatically performed, and the convenience of the user is improved.
[0058]
The above is the description of the operation in the normal case of the present embodiment. Next, the operation when the spring winding number measuring means 11 does not function normally will be described.
[0059]
Now, due to malfunction or the like, the value of the number of windings of the power storage spiral spring 4 measured by the spring winding number measuring means 11 is larger than the number of actual windings of the power storage spiral spring 4. Suppose that it shows a small value. Since the operator usually does not notice such abnormalities, the starting rope 34 is pulled in the same manner as in the normal state. As a result, the input wheel 3 rotates forward via the recoil reel 1 and the input-side unidirectional rotational transmission means 2, and the amount of accumulated force further increases. It is assumed that the power accumulation amount reaches a predetermined value as a result of the vortex spring 4 for power accumulation being further wound beyond the target number of windings.
[0060]
In this case, the protrusion 4a is detached from the recess 3c, the linkage between the input wheel 3 and the power storage spiral spring 4 is cut off, and the power accumulation in the power storage spiral spring 4 is prevented. On the other hand, the input wheel 3 is still rotated by the pulling operation of the starting rope 34, so that the measuring wheel 15 is chopped by the rotation of the input wheel 3, and eventually reaches a position corresponding to the target number of windings. . As a result, the lock lever 21 is switched to the unlocked position, and the stored force of the power storing spiral spring 4 is released. Note that the amount of stored power released at this time is larger than the amount corresponding to the target number of windings, so there is no problem in starting the engine.
[0061]
When the starting rope 34 is rewound from this state, as described above, the spring winding number measuring means 11 is reset by the reverse rotation of the recoil reel 1 in the Y direction, and the measuring ratchet wheel 15 returns to the initial position. Thus, both the measuring claw wheel 15 and the power storage spiral spring 4 return to the initial state.
[0062]
Thus, in this embodiment, even if the value of the number of windings of the power storage spiral spring 4 measured by the spring winding number measuring means 11 is actually larger than the number of times of winding the power storage spiral spring 4. Even if the value shows a small value, if the starting rope 34 is continuously pulled, the output wheel 5 is unlocked and the stored force is released, and on the other hand, the spring is released by the rewinding operation of the starting rope 34. Since the winding number measuring means 11 is reset, it is possible to correct the discrepancy between the scale of the spring winding number measuring means 11 and the actual accumulated amount of power of the vortex spring 4 for power storage.
[0063]
13 and 14 show a modification of the above embodiment. In addition, the same code | symbol is attached | subjected to the member and element which have the same function as the said embodiment. Further, in the description of the modified examples, portions not particularly mentioned are configured in the same manner as in the above embodiment.
[0064]
As shown in FIGS. 13 and 14, the input wheel 3 of this modification is provided with two recesses 3c. The reason why a plurality of the recesses 3c are provided is as follows. In general, when the protruding portion 4a is detached from the concave portion 3c, the power storage spiral spring 4 loses the restraint up to that point, so that it releases its stored force to restore its natural length and the outer end portion is somewhat rewound. Sometimes. In such a case, if there is only one recess 3c on the inner peripheral surface of the input wheel 3, when the protrusion 4a is detached from the recess 3c, until the protrusion 4a is next engaged with the recess 3c. In addition, there is a possibility that the accumulated force corresponding to about one rotation as the number of rotations of the input wheel 3 is released. However, when a plurality of the recesses 3c are formed on the inner peripheral surface of the input wheel 3 (two in this modification), even if the protrusions 4a are detached from the recesses 3c, the accumulated energy is released so much. Before the projection 4a and the recess 3c are engaged, there is a high possibility that the projection 4a and the recess 3c are engaged with each other.
[0065]
As mentioned above, although embodiment of this invention was described, this invention is not limited by the said embodiment, In the range of the summary of invention, it can change suitably and can implement. For example, in the above embodiment, the case where one or two recesses 3c are provided on the inner peripheral surface of the input wheel 3 has been described, but three or more may be provided. In the above-described embodiment, the feeding claw 14 is configured to be freely raised and lowered, but may be configured not to be able to fall down. The measurement resetting means in the above embodiment is configured to return the spring winding number measuring means 11 to the initial position based on the rewinding rotation in which the recoil reel 1 rewinds the starting rope 34. It is not limited. In the above embodiment, the first ratchet claw 51 and the second ratchet claw 52 are provided. However, only the first ratchet claw 51 may be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view of an embodiment of the present invention.
2A is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. 2A.
3 is a cross-sectional view taken along line III-III in FIG.
4 is a view in which a lock lever 21 is removed from FIG. 3. FIG.
FIG. 5 is a view in which a second ratchet pawl 52 is removed from FIG. 4;
6 is a cross-sectional view taken along the line VI-VI in FIG. 3;
FIG. 7 is a view of the output-side unidirectional rotation transmission unit as viewed from the engine side.
8A is a front view of the input wheel 3, and FIG. 8B is a cross-sectional view taken along line BB in FIG. 8A.
FIG. 9A is a view of the spring winding number measuring means 11 as viewed from the engine side (however, the lock lever 21 and the first ratchet pawl 51 are omitted). FIG. 9B shows the main part of FIG. 9A and shows the movement of the feed claw 14.
FIG. 10 is a diagram showing a state of each part when the spring winding number measuring means 11 reaches a target winding number.
11 is a view of the housed state of the power-accumulating spiral spring 4 inside the input wheel 3 as viewed from the engine side, showing a state when the starting rope 34 is not pulled. FIG.
12 is a view of the housed state of the power storage spiral spring 4 inside the input wheel 3 as viewed from the engine side, and shows a state immediately before the stored force of the power storage spiral spring 4 reaches a predetermined value. FIG.
FIG. 13 is a view of the housed state of the power storage spiral spring 4 as viewed from the engine side in a modified example, showing a state in which the starting rope 34 is not pulled.
FIG. 14 is a view of the accommodation state of the power storage spiral spring 4 as viewed from the engine side in a modified example, and shows a state immediately before the stored force of the power storage spiral spring 4 reaches a predetermined value.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Recoil reel, 2 ... Input side one way rotation transmission means, 3 ... Input wheel, 3c ... Recessed part, 4 ... Spiral spring for power storage, 4a ... Projection part, 5 ... Output wheel, 6 ... Output side one direction rotation transmission Means 7: Crankshaft (starting shaft) 8 ... Reverse rotation preventing means 9 ... Fixing part 11 ... Spring winding number measuring means 12 ... Lock releasing means 15 ... Measuring claw wheel 20 ... Locking part , 21 ... Lock lever.

Claims (4)

The recoil reel (1) is provided with an input side unidirectional rotation transmission means (2), an input wheel (3), a power storage spiral spring (4), an output wheel (5), and an output side unidirectional rotation transmission means (6). The engine start shaft (7) is interlocked and connected through
The input wheel (3) is supported by the fixed portion (9) so as to be freely rotated in the forward direction and prevented from being reversed by the reverse rotation preventing means (8).
A locking portion (20) provided on the output wheel (5);
A lock lever (21) locked to the locking portion (20) to prevent rotation of the output wheel (5);
Spring winding number measuring means (11) for measuring the number of windings of the power storage spiral spring (4);
Unlocking means (12) for switching the lock lever (21) to the unlocked position when the number of windings of the power storage spiral spring (4) reaches the target number of windings;
In the engine recoil starter with
A projecting portion (4a) projecting radially outward is provided at an outer end portion of the spiral spring (4) for storing power, and the projecting portion (4a) and a recess (3c) which can be freely engaged and disengaged are provided on the input wheel (3). Formed on the inner peripheral surface of
Until the stored force of the power storage spiral spring (4) reaches a predetermined amount, the protrusion (4a) engages with the recess (3c), and the input wheel (3) rotates forward to rotate the power storage spiral. The spring (4) is configured to be wound up,
When the accumulated force of the power storage spiral spring (4) reaches a predetermined amount, the protrusion (4a) is detached from the recess (3c), and the power storage spiral spring (4) is prevented from being wound. Configured to
Count value of the number of windings of the vortex spring for power storage ( 4 ) measured by the spring winding number measuring means (11) based on the recoil reel ( 1 ) rotating in the direction to rewind the starting rope (34). A measurement reset means for resetting is provided,
An engine recoil starter characterized by that. The engine recoil starter according to claim 1,
The predetermined amount is set to a value larger than the amount of accumulated power corresponding to the target number of windings of the power storage spiral spring (4).
An engine recoil starter characterized by that. The engine recoil starter according to claim 1 or 2,
The means for measuring the number of times of winding the spring (11) includes a measuring tooth wheel (15) which is engraved and fed by the rotation of the input wheel (3). Constructed to measure the number of windings of the spring (4),
An engine recoil starter characterized by that. The engine recoil starter according to any one of claims 1 to 3,
A plurality of the recesses (3c) are formed on the inner peripheral surface of the input wheel (3).
An engine recoil starter characterized by that.

Images