Recoil starter for internal combustion engine

Abstract

The present invention provides a recoil starter for an internal combustion engine, including a rope winding system composed of a handle, a rope, a rope wheel, a coil spring, a starter cover, etc., a pawl extension system composed of a pawl, a pawl pull rod, a tension spring, a rope wheel pressure plate, a damping spring, etc., and a stop system composed of a torsion spring, a stop pawl, etc. The beneficial effect is that the present invention designs the pawl extension function in the process of pulling the starter, and adds a structure to prevent the starter from being pulled by mistake, completely eliminating the hidden dangers of pawl wear and starter breakage, and avoiding the occurrence of personal injury.

Description

Technical Field

[0001] The invention relates to the field of internal combustion engines, in particular to a recoil starter for an internal combustion engine. Background Art

[0002] Most common internal combustion engines are equipped with a recoil starter for starting, which achieves the purpose of starting by pulling out a pull rope with a handle at the front end to rotate the crankshaft of the internal combustion engine.

[0003] For example, Chinese patent publication number CN 103161635 A discloses a recoil starter, which consists of a starting handle, a cable, a cable drum, a ratchet, a recoil spring, a pulley, a pawl and a drum housing. When starting the internal combustion engine, the starting handle is pulled, and the cable wound on the cable drum is pulled out by the starting handle, while driving the cable drum, the ratchet and the pulley to rotate, so that the internal combustion engine is started smoothly. The high-speed rotating internal combustion engine retracts the pawl due to the centrifugal force, so that the recoil starter is out of contact with the pulley. After letting go, the recoil spring retracts the cable into the cable drum for the next start.

[0004] Although the above device has a simple structure, there is still a problem that foreign matter entering the starter can easily get stuck on the pawl. Even if the internal combustion engine has started, the pawl is difficult to retract, which can easily cause wear of the pawl. In severe cases, the starter may be broken, and flying foreign matter may cause personal injury. Although the invention adds a foreign matter discharge port to the pulley, some foreign matter cannot be discharged well, and wear of the pawl or personal injury accidents may still occur. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a recoil starter for an internal combustion engine, in which the pawl extension function is designed during the starter pulling process, and a structure is added to prevent the starter from being pulled incorrectly, thereby completely eliminating and avoiding the pawl wear problem.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions: A recoil starter for an internal combustion engine, comprising a rope winding system consisting of a handle, a pull rope, a rope wheel, a coil spring, and a starter cover, a pawl retracting system consisting of a pawl, a pawl pull rod, a tension spring, a rope wheel pressure plate, and a damping spring, and a stopping system consisting of a torsion spring and a stopping pawl, characterized in that the rope wheel is fastened to a rope wheel shaft of the starter cover by a fastening bolt through a rope wheel pressure plate and can rotate around the rope wheel shaft, two ends of the pull rope are tied into rope knots, which are respectively fixed to the rope wheel and the handle, and are wound in a rope wheel groove of the rope wheel according to a certain rotation direction, the coil spring is placed between the rope wheel and the starter cover, one end of the coil spring is clamped on the inner hook clamping platform of the rope wheel through the inner hook of the coil spring, and the other end is clamped on the outer hook clamping platform of the starter cover through the outer hook of the coil spring, and a certain torque is maintained to ensure that the pulled rope can automatically return after being released. The pawl is installed in the pawl mounting hole of the rope wheel and can rotate around the pawl mounting hole within a certain angle. One end of the pawl pull rod is inserted into the pawl hole of the pawl, and the other end is connected to the tension spring. The other end of the tension spring is hung on the tension spring fixing seat of the starter cover. The damping spring is installed on the shallow basin-shaped outer wall between the rope wheel pressure plate and the rope wheel. It cannot fall out and has a certain clamping force. The damping arm extends into the rod hole of the pawl pull rod; the pawl installs the rocker arm and the washer in the pawl hole of the starter cover together. The torsion spring is sleeved on the rotating shaft of the pawl, one end is fixed in the torsion spring fixing hole of the starter cover, and the other end is pressed on the return arm of the pawl, and a certain torque is maintained to press the pawl against the stopping boss of the rope wheel to prevent the pull rope from being pulled out due to misoperation or the like.

[0007] Furthermore, the rope pulley pressure plate is provided with a positioning hole, the starter cover is provided with a rope pulley shaft, and the rope pulley shaft is provided with a fixing boss to ensure that the rope pulley pressure plate and the starter cover do not rotate after the fastening bolts are tightened.

[0008] Furthermore, the rope pulley pressure plate is a shallow basin shape, which facilitates the damping spring to be clamped on the outside of the basin wall.

[0009] Furthermore, the pawl is provided with a slot and is mounted on the starter cover via an open retaining ring in the slot.

[0010] Furthermore, the pawl is provided with a pawl hole, which can be connected with the pawl pull rod.

[0011] Furthermore, the locking claw is provided with a pin hole and is mounted on the starter cover via a cotter pin in the pin hole.

[0012] Furthermore, a stopping boss is provided on the outer edge of the rope pulley, which can effectively prevent the starter from being pulled by mistake after the internal combustion engine is running after contacting with the stopping claw.

[0013] Furthermore, the damping spring is provided with a damping arm, which can control the rotation of the pawl.

[0014] Furthermore, the ratchet pull rod is provided with a pull rod hole, which can realize the linkage of the damping spring, the tension spring, the ratchet pull rod and the ratchet.

[0015] Furthermore, the locking claw is provided with a return arm, and the rotation of the locking claw is achieved through the torsion force of the torsion spring and the rocker arm.

[0016] The beneficial effect of the present invention is that through the linkage of the above structure, the internal combustion engine can be started smoothly when the handle is pulled. Since the pawl is extended and works by the tension spring and the damping spring when pulled, the pawl will not be damaged due to the suction of foreign matter when the machine is running. At the same time, the present invention provides a stop pawl system, which avoids the problem of the pawl being extended and damaged due to the starter being pulled by mistake during the operation of the internal combustion engine, and avoids the problem of the starter being broken in serious cases, causing personal injury. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a front view of an embodiment of the present invention; Figure 2 It is a schematic diagram of the assembly relationship between the rope pulley and the coil spring of the present invention; Figure 3 It is a schematic diagram of the structure of the rope wheel and the locking claw of the present invention; Figure 4 is a rear view of an embodiment of the present invention; Figure 5 It is a schematic diagram of the assembly relationship between the rope pulley and the starter cover of the present invention; Figure 6 is a schematic structural diagram of the ratchet pull rod of the present invention; Figure 7 is a schematic structural diagram of the ratchet of the present invention; Figure 8 This is the installation intention of the damping spring and the rope pulley pressure plate of the present invention; Fig. 9 It is a schematic structural diagram of the locking claw of the present invention.

[0019] The following are the descriptions of the reference numerals: 1. Handle; 2. Starter cover; 2-2. Stop pawl hole; 2-3. Rope pulley shaft; 2-4. External hook hanging platform; 2-5. Fixed boss; 3. Pull rope; 3-1. Pull rope knot; 4. Tension spring; 5. Ratchet pull rod; 5-1. Pull rod hole; 6. Ratchet; 6-1 Ratchet hole; 6-2. Slot; 6-3. Ratchet shaft; 7. Rope pulley; 7-1. Internal hook hanging platform; 7-2. Ratchet mounting hole; 7-3. Rope pulley groove; 7-4. Stop boss; 7-5. Tension spring fixing seat; 8. Rope pulley pressure plate; 8-1 Pressure plate positioning hole; 9. Fastening bolt; 10. Damping spring; 10-1. Damping arm; 11. Coil spring; 11-1. Coil spring inner hook; 11-2. Coil spring outer hook; 12. Torsion spring; 13. Rocker arm; 14. Stop pawl; 14-1 Return arm; 14-2, pin hole; 14-3, rotating shaft; 15, gasket; 16, cotter pin; 17, cotter retaining ring. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figures 1 to 9 As shown, a recoil starter for an internal combustion engine includes a rope winding system consisting of a handle 1, a rope 3, a rope pulley 7, a coil spring 11, a starter cover 2, etc., a pawl retracting system consisting of a pawl 6, a pawl pull rod 5, a tension spring 4, a rope pulley pressure plate 8, a damping spring 10, etc., and a stopping system consisting of a torsion spring 12, a stopping pawl 14, etc.

[0024] The rope pulley 7 is fastened to the rope pulley shaft 2-3 of the starter cover 2 by the fastening bolts 9 through the rope pulley pressure plate 8, and can rotate around the rope pulley shaft 2-3. The two ends of the pulley 3 are tied into a pulley knot 3-1, which are fixed on the rope pulley 7 and the handle 1 respectively, and are wound in the rope pulley groove 7-3 of the rope pulley 7 according to a certain rotation direction. The coil spring 11 is placed between the rope pulley 7 and the starter cover 2, one end of which is clamped on the inner hook hanging platform 7-1 of the rope pulley 7 through the inner hook 11-1 of the coil spring, and the other end is clamped on the outer hook hanging platform 2-4 of the starter cover 2 through the outer hook 11-2 of the coil spring, and a certain torque is maintained to ensure that the pulled rope 3 can automatically wind back into the rope pulley groove 7-3 after being released; the pawl 6 is installed in the pawl mounting hole 7-2 of the rope pulley 7, and can rotate around the pawl mounting hole 7-2 within a certain angle, and the pawl pull rod One end of the torsion spring 12 is inserted into the pawl hole 6-1 of the pawl 6, and the other end is connected to the tension spring 4. The other end of the tension spring 4 is hung on the tension spring fixing seat 2-1 of the starter cover 2. The damping spring 10 is installed on the shallow basin-shaped outer wall between the rope wheel pressure plate 8 and the rope wheel 7. It cannot be dislodged and has a certain clamping force. The damping arm 10-1 extends into the rod hole 5-1 of the pawl pull rod 5. The stop pawl 14 is installed in the stop pawl hole 2-2 of the starter cover 2. The torsion spring 12 is sleeved on the rotating shaft 14-3 of the stop pawl 14, one end of which is fixed in the torsion spring fixing hole 2-3 of the starter cover 2, and the other end is pressed on the return arm 14-1 of the stop pawl 14, and a certain torque is maintained to press the stop pawl 14 against the stop boss 7-4 of the rope wheel 7 to prevent the pull rope from being pulled out due to misoperation or other reasons.

[0025] The rope pulley pressure plate 8 is provided with a positioning hole 8-1, the starter cover 2 is provided with a rope pulley shaft 2-3, and the rope pulley shaft 2-3 is provided with a fixing boss 2-5 to ensure that the rope pulley pressure plate 8 and the starter cover 2 do not rotate after the fastening bolts 9 are tightened.

[0026] The rope pulley pressure plate 8 is a shallow basin shape, which is convenient for the damping spring 10 to be stuck on the outside of the basin wall.

[0027] The ratchet 6 is provided with a slot 6 - 2 and is mounted on the starter housing 2 via an open retaining ring 17 in the slot 6 - 2 .

[0028] The ratchet 6 is provided with a ratchet hole 6-1, which can be connected with the ratchet pull rod 5 The locking claw 14 is provided with a pin hole 14 - 2 and is fixed to the starter housing 2 via a split pin 16 installed in the pin hole 14 - 2 .

[0029] The outer edge of the rope wheel 7 is provided with a stop boss 7-4, which can effectively prevent the starter from being pulled by mistake after the internal combustion engine is running after contacting with the stop claw 14.

[0030] The damping spring 10 is provided with a damping arm 10 - 1 , which can control the rotation of the pawl 6 .

[0031] The ratchet rod 5 is provided with a rod hole 5 - 1 , which can realize the linkage of the damping spring 10 , the tension spring 4 , the ratchet rod 5 , and the ratchet 6 .

[0032] The locking claw 14 is provided with a return arm 14 - 1 , and the rotation of the locking claw 14 is achieved through the torsion force of the torsion spring 12 and the rocker arm 13 .

[0033] When the present invention is working normally, the operator pulls the handle 1, and the pull rope 3 wound on the rope wheel 7 will drive the rope wheel 7 to rotate around the rope wheel shaft 2-3. The tension spring 4, the pawl pull rod 5, and the pawl 6 assembled on the rope wheel rotate together with the rope wheel 7 under the traction of the tension spring fixing seat 7-5. Because the damping spring 10 is stuck on the outer side of the rope wheel pressure plate 8, the rope wheel pressure plate 8 is fixed to the starter cover 2 by the fastening bolts 9 through the fixing boss 2-5. Due to the resistance effect, the damping spring 10 will not rotate with the rope wheel 7 in the initial stage of rotation. The damping spring 10 has a The arm 10-1 will prevent the pawl pull rod 5 from rotating. Relative to the pawl 6, the pawl shaft 6-3 rotates with the rope pulley 7, and the pawl hole 6-1 is prevented from rotating by the pawl pull rod 5, forming a rotational torque. At this time, the pawl 6 is extended by the rotational force, and when it is extended to a certain position, it will drive the crankshaft of the internal combustion engine to rotate together. As the rotation angle of the rope pulley 7 is further increased, under the action of the gradually increasing tension of the spring 4, the damping spring 10 will overcome the resistance and rotate together. At this time, the rotating rope pulley 7 will drive the internal combustion engine to accelerate through the pawl 6, and start the internal combustion engine quickly.

[0034] Because one end of the coil spring 11 is connected to the rope pulley 7, and the other end is connected to the starter cover 2, as the rope pulley 7 rotates, the elastic force of the coil spring 11 gradually increases, and the increased elastic force tends to cause the rope pulley 7 to rotate in the opposite direction. Once the handle is released, the rope pulley 7 rotates in the opposite direction under the action of the elastic force of the coil spring 11, and the pull rope 3 is rewound in the rope pulley groove 7-3 of the rope pulley 7. At the same time, the tension of the tension spring 4 and the damping force of the damping spring 10 pull the pawl 6 back to its original position through the pawl pull rod 5, the recoil starter returns to its position, and the internal combustion engine works normally.

[0035] Normally, when the internal combustion engine is rotating normally, if someone pulls the handle 1, the pawl 6 can still be extended. At this time, the extended pawl 6 will interfere with the rotating shaft of the internal combustion engine, causing wear or breaking of the starter. In severe cases, the broken starter may cause personal safety. However, the braking system designed in the present invention just prevents this problem from occurring.

[0036] The cotter pin 16 is installed in the pin hole 14-2 of the pawl 14, and the pawl 14, torsion spring 12, rocker arm 13, and gasket 15 are assembled in the pawl hole 2-2 of the starter cover 2. One end is fixed to the torsion spring fixing hole 2-3, and the other end is pressed on the return arm 14-1. The torsion spring 12 presses the pawl 14 onto the stop boss 7-4 of the pulley 7. When the operator pulls the handle 1 by mistake, the stop boss 7-4 on the pulley 7 interferes with the pawl 14 to prevent rotation, thereby avoiding the pawl 6 from extending and protecting the starter. Unless the rocker arm 13 is manually rotated, the rocker arm 13 pushes the return rocker arm 14-1 on the pawl 14 to move the pawl 14 away from the stop boss 7-4 position, and the pulley 7 rotates to start the internal combustion engine.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A recoil starter for an internal combustion engine, comprising a rope winding system consisting of a handle, a rope, a rope pulley, a coil spring, a starter cover, etc., a pawl retracting system consisting of a pawl, a pawl pull rod, a tension spring, a rope pulley pressure plate, a damping spring, etc., and a stop system consisting of a torsion spring, a stop pawl, etc., characterized in that: The rope wheel is fastened to the rope wheel shaft of the starter cover by the fastening bolts through the rope wheel pressure plate and can rotate around the rope wheel shaft. The two ends of the pull rope are tied into pull rope knots and are respectively fixed to the rope wheel and the handle and are wound in the rope wheel groove in a certain rotation direction. The coil spring is placed between the rope wheel and the starter cover, one end of which is clamped on the inner hook clamping platform of the rope wheel through the inner hook of the coil spring, and the other end is clamped on the outer hook clamping platform of the starter cover through the outer hook of the coil spring. The pawl is installed in the pawl mounting hole of the rope wheel and can rotate around the pawl mounting hole within a certain angle. One end of the pawl pull rod is inserted into the pawl of the pawl The pawl hole has one end and the other end is connected to a tension spring. The other end of the tension spring is hung on a tension spring fixing seat of the starter cover. The damping spring is installed on the shallow basin-shaped outer wall between the rope pulley pressure plate and the rope pulley. It cannot fall out and has a certain clamping force. The damping arm extends into the pull rod hole of the ratchet pull rod; the pawl installs the rocker arm and the washer together in the pawl hole of the starter cover. The torsion spring is sleeved on the rotating shaft of the pawl, one end is fixed in the torsion spring fixing hole of the starter cover, and the other end is pressed on the return arm of the pawl, and maintains a certain torque to press the pawl against the stopping boss of the rope pulley.

2. The recoil starter for an internal combustion engine according to claim 1, characterized in that: The rope pulley pressure plate is provided with a positioning hole, the starter housing is provided with a rope pulley shaft, and the rope pulley shaft is provided with a fixing boss.

3. The recoil starter for an internal combustion engine according to claim 1, characterized in that: The rope pulley pressure plate is a shallow basin shape.

4. The recoil starter for an internal combustion engine according to claim 1, characterized in that: The ratchet pawl is provided with a clamping groove and is installed on the starter cover shell through an opening retaining ring in the clamping groove.

5. The recoil starter for an internal combustion engine according to claim 1, characterized in that: The pawl is provided with a pawl hole.

6. The recoil starter for an internal combustion engine according to claim 1, characterized in that: The locking claw is provided with a pin hole.

7. The recoil starter for an internal combustion engine according to claim 1, characterized in that: The outer edge of the rope wheel is provided with a stopping boss.

8. The recoil starter for an internal combustion engine according to claim 1, characterized in that: The damping spring is provided with a damping arm.

9. The recoil starter for an internal combustion engine according to claim 1, characterized in that: The ratchet pull rod is provided with a pull rod hole.

10. The recoil starter for an internal combustion engine according to claim 1, characterized in that: The locking claw is provided with a return arm.

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