Starter clutch mechanism

Abstract

The utility model discloses a starter clutch mechanism, which comprises a pusher dog seat, pusher dogs and a pusher dog limit cup, the pusher dog seat is provided with a mounting hole, a plurality of pusher dogs are annularly distributed on the pusher dog seat, the pusher dogs are rotatably connected with the pusher dog seat, one end of each pusher dog is provided with an extending part, and each pusher dog is provided with an opening and closing groove; the pusher dog limiting cup is arranged on the outer side of the pusher dog seat, a plurality of notches are formed in the side wall of the pusher dog limiting cup, and the notches are used for allowing the extending part of the pusher dog to extend to the outer side of the pusher dog limiting cup and be connected with a starting cup on a crankshaft of the internal combustion engine; an opening and closing protrusion is arranged on the inner side of the pusher dog limiting cup and extends into the opening and closing groove. According to the clutch mechanism, the opening and closing movement of the pusher dog is controlled through the matching effect of the opening and closing protrusion and the opening and closing groove, a torsional spring does not need to be arranged, the clutch mechanism is simple in overall structure, convenient to assemble, stable in performance, easy to maintain and long in service life, and the application range of the clutch mechanism is widened.

Description

Technical Field

[0001] This utility model belongs to the technical field of internal combustion engine starter technology, specifically relating to a starter clutch mechanism. Background Technology

[0002] Internal combustion engines in micro-agricultural machinery (such as diesel and gasoline engines) require external force to start and must be able to start in wet environments and at low temperatures. Currently, there are four starting methods for internal combustion engines: hand-operated, hand-cranked, foot-operated, and electric start. Hand-operated, hand-cranked, and foot-operated starting methods require considerable physical strength from the operator, making them unsuitable for women and the elderly. Furthermore, traditional hand-operated, hand-cranked, and foot-operated methods require even greater force to start the engine at low temperatures. While electric start is easy to use, it is unsuitable for wet environments as it can easily cause short circuits in electrical components. Additionally, the starter batteries are large and heavy, requiring regular charging, which makes operation inconvenient.

[0003] To address the aforementioned issues, existing technologies have proposed several pull-free starters. These starters utilize a rotating spindle to store energy in a spiral spring, which is then released to drive the crankshaft of an internal combustion engine, thus starting the engine. This method reduces the strength requirements for the operator and is not limited by the presence of water. For example, a starter for micro-agricultural machinery with patent publication number CN220748437U operates as follows: The spindle rotates, causing the spiral spring, the clutch assembly mounting base, and the drive component to rotate synchronously. The spiral spring begins to store energy. When the boss on the drive component rotates to abut against the limit plate, it pushes the ratchet to rotate synchronously with the spindle. As the mounting base on the clutch assembly rotates, its oscillating block is retracted into a protective cover, separating the clutch assembly from the starter cup on the internal combustion engine crankshaft. When the spiral spring is fully charged (i.e., the spindle can no longer rotate), it stops rotating the spindle. Once the spiral spring has stored enough energy and stops rotating the main shaft, the main shaft will rotate in the opposite direction under the force of the spiral spring, since the boss of the drive component is housed in the ratchet's receiving groove. This reverse rotation causes the drive component on the main shaft to rotate in the opposite direction until the boss on the drive component abuts against the limiting platform at the other end of the receiving groove. Because the limiting platform is integrated with the ratchet, and the ratchet is held in place by the pawl and cannot rotate in the opposite direction, the drive component will also stop rotating. Simultaneously, the clutch assembly mounting seat will rotate with the main shaft's reverse rotation. During this process, the pad moves within the second notch, preventing the protective cover from rotating synchronously with the mounting seat. The swing block extends from the first notch and engages with the internal combustion engine's starter cup as the mounting seat rotates. When starting the internal combustion engine, rotating the pawl disengages it from the ratchet, freeing the main shaft from restraint and releasing energy under the force of the spiral spring. This released energy drives the internal combustion engine's crankshaft to rotate via the swing block on the clutch assembly, thus starting the internal combustion engine.

[0004] In the prior art, the clutch assembly uses a torsion spring to provide a thrust to the oscillating block towards the outside of the mounting base. Since each oscillating block needs to be equipped with a torsion spring, the clutch assembly is complicated to assemble, which is time-consuming and labor-intensive. Moreover, under long-term use, the torsion spring may be damaged and lose its original shape and elasticity, resulting in unstable performance of the clutch assembly, difficulty in maintenance, and limiting the scope of application of the clutch assembly. Utility Model Content

[0005] The purpose of this invention is to provide a starter clutch mechanism to solve the aforementioned problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a starter clutch mechanism, comprising a pawl seat, a pawl, and a pawl limiting cup. The pawl seat has a mounting hole for connecting to the starter's main shaft. Multiple pawls are arranged in a ring on the pawl seat and are rotatably connected to the pawl seat. One end of the pawl has a protruding portion, and the pawl has an opening and closing groove. The pawl limiting cup is located on the outside of the pawl seat. The side wall of the pawl limiting cup has multiple notches for allowing the protruding portion of the pawl to extend to the outside of the pawl limiting cup and connect with the starter cup on the crankshaft of the internal combustion engine. The inner side of the pawl limiting cup has an opening and closing protrusion that extends into the opening and closing groove. The opening and closing protrusion cooperates with the opening and closing groove to control the protruding portion of the pawl to extend to the outside of the pawl limiting cup or to the inside of the pawl limiting cup.

[0007] As an optional implementation of the above technical solution, the surfaces of the opening and closing protrusions and the opening and closing grooves are both arc surfaces.

[0008] As an optional implementation of the above technical solution, the pawl seat is provided with a pin, and the pawl is connected to the pin.

[0009] As an optional embodiment of the above technical solution, the pawl seat includes a first plate and a second plate disposed opposite to each other, both the first plate and the second plate are provided with mounting holes, and the pawl is rotatably disposed between the first plate and the second plate.

[0010] As an optional implementation of the above technical solution, the first plate is provided with a plurality of limiting protrusions arranged in a ring, and the end of the claw away from the protrusion is provided with a limiting part, and the limiting protrusion abuts against the limiting part.

[0011] As an optional implementation of the above technical solution, the limiting protrusion is formed by folding a strip structure on the first plate.

[0012] As an optional embodiment of the above technical solution, a clamping plate is provided on the outer side of the second plate, and the clamping plate is mounted on the main shaft by a retaining ring.

[0013] As an optional implementation of the above technical solution, the mounting hole is a square hole.

[0014] As an optional implementation of the above technical solution, the number of the claws is 2-8.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention utilizes the interaction between the opening and closing protrusions and the opening and closing grooves to control the opening and closing movement of the pawl. It eliminates the need for a torsion spring, resulting in a simpler overall structure for the clutch mechanism. Furthermore, it is easy to assemble, has stable performance, is easy to maintain, and has a long service life, which helps to expand the application range of the clutch mechanism. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the clutch mechanism in one embodiment of the present invention;

[0018] Figure 2 This is an exploded view of the clutch mechanism in one embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the pawl and pawl limiting cup in one embodiment of this utility model.

[0020] In the diagram: 2-Main shaft; 501-Pawl seat; 502-Pawl; 503-Pawl limiting cup; 504-Extend; 505-Opening and closing groove; 506-Notch; 507-Opening and closing protrusion; 508-Pin; 509-First plate; 510-Second plate; 511-Limiting protrusion; 512-Limiting part; 513-Pressure plate; 514-Clip ring. Detailed Implementation

[0021] like Figures 1-3 As shown, this embodiment provides a starter clutch mechanism, including a pawl seat 501, a pawl 502, and a pawl limiting cup 503. The pawl seat 501 is provided with mounting holes, such as... Figure 1 As shown, the mounting hole is used to connect with the starter's main shaft 2, allowing the starter's main shaft 2 to rotate the pawl seat 501. Preferably, the mounting hole is a square hole, located at the center of the pawl seat 501, and a corresponding square mounting portion adapted to the square hole is also provided on the main shaft 2.

[0022] like Figure 2As shown, multiple pawls 502 are arranged in a ring on the pawl seat 501, and the pawls 502 are rotatably connected to the pawl seat 501. One end of each pawl 502 has a protrusion 504, and the pawl 502 has an opening and closing groove 505. It should be noted that multiple pawls 502 refers to at least two pawls 502, and the number of pawls 502 can be set according to actual needs. Usually, the number of pawls 502 is 2-8. In this embodiment, there are six pawls 502, which are arranged in a ring on the pawl seat 501.

[0023] The pawl limiting cup 503 is disposed on the outer side of the pawl seat 501. The side wall of the pawl limiting cup 503 has multiple notches 506, the number of which matches the number of pawls 502. The notches 506 allow the protruding portions 504 of the pawls 502 to extend to the outside of the pawl limiting cup 503 and connect to the starter cup on the crankshaft of the internal combustion engine. The inner side of the pawl limiting cup 503 has an opening and closing protrusion 507, which extends into the opening and closing groove 505. The opening and closing protrusion 507 cooperates with the opening and closing groove 505 to control whether the protruding portion 504 of the pawl 502 extends to the outside of the pawl limiting cup 503 or extends into the inside of the pawl limiting cup 503. Preferably, the surfaces of the opening and closing protrusion 507 and the opening and closing groove 505 are both arc surfaces.

[0024] This utility model utilizes the cooperation between the opening and closing protrusion 507 and the opening and closing groove 505 to control the opening and closing movement of the pawl 502. It does not require the setting of a torsion spring, the overall structure of the clutch mechanism is relatively simple, and it is easy to assemble, has stable performance, is easy to maintain, and has a long service life, which helps to increase the application range of the clutch mechanism.

[0025] In this embodiment, the pawl seat 501 is provided with six pins 508, and each pawl 502 is rotatably connected to each pin 508, so that the protruding part 504 of the pawl 502 can extend to the outside of the pawl limiting cup 503 through the notch 506.

[0026] like Figure 2 As shown, specifically, the pawl seat 501 includes a first plate 509 and a second plate 510 disposed opposite to each other. Both the first plate 509 and the second plate 510 have mounting holes in their middle portions. The pawl 502 is rotatably disposed between the first plate 509 and the second plate 510. The two ends of a pin 508 are respectively connected to the first plate 509 and the second plate 510. The pawl 502 is mounted on the pin 508 and clamped between the first plate 509 and the second plate 510. A clamping plate 513 is provided on the outer side of the second plate 510, and the clamping plate 513 is mounted on the main shaft 2 via a retaining ring 514.

[0027] like Figure 3As shown, the first plate 509 is provided with a plurality of ring-shaped limiting protrusions 511, and the end of the claw 502 away from the protrusion 504 is provided with a limiting part 512, and the limiting protrusions 511 abut against the limiting part 512. Preferably, the limiting protrusions 511 are formed by folding the strip structure on the first plate 509.

[0028] In use, the clutch mechanism of this invention drives the starter's main shaft 2 to rotate counterclockwise via a crank handle, causing the spiral spring on the main shaft 2 to store force. The main shaft 2 then drives the pawl seat 501 to rotate counterclockwise. At this time, the opening and closing protrusion 507 and the opening and closing groove 505 abut against each other, thereby generating rotational resistance to the pawl seat 501 from the pawl limiting cup 503. Simultaneously, the limiting part 512 abuts against the limiting protrusion 511, allowing the pawl seat 501 to push the pawl limiting cup 503 to rotate together via the pawls 502.

[0029] After the spiral spring has fully charged, the main shaft 2 rotates a short distance in the opposite direction, allowing it to drive the pawl seat 501 and each pawl 502 to swing clockwise. The opening and closing protrusion 507 and the opening and closing groove 505 abut against each other, causing the pawl limiting cup 503 to create a certain resistance to the rotation of the pawl seat 501 through the opening and closing protrusion 507, preventing the pawl seat 501 from rotating. This allows the pawls 502 to swing around the pin 508 in a direction away from the center of the pawl seat 501, causing each pawl 502 to unfold at a certain angle. As a result, the protruding part 504 of the pawl 502 can extend out of the pawl seat 501 and engage with the starting cup on the internal combustion engine.

[0030] Once the main shaft 2 stops rotating in the reverse direction, the pawl 502 is already engaged with the starter cup on the internal combustion engine. The user then unlocks the main shaft 2, causing the scroll spring to fully release its tension and rotate at high speed clockwise. This rotation, via the pawl 502, drives the starter cup to rotate at high speed, thus starting the internal combustion engine.

[0031] In this description of the utility model, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. They can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model. Furthermore, the specific features and structures described in the embodiments are included in at least one implementation method. Those skilled in the art can combine features from different implementation methods without contradiction. The scope of protection of this utility model is not limited to the specific implementation methods described above. Based on the basic technical concept of this utility model, implementation methods that can be conceived by those skilled in the art without creative effort are all within the scope of protection of this utility model.

Claims

1. A starter clutch mechanism, characterized in that, The device includes a pawl seat (501), pawls (502), and pawl retaining cups (503). The pawl seat (501) has mounting holes for connecting to the main shaft (2) of the starter. Multiple pawls (502) are arranged in a ring on the pawl seat (501) and are rotatably connected to the pawl seat (501). One end of each pawl (502) has a protrusion (504), and each pawl (502) has an opening and closing groove (505). The pawl retaining cups (503) are located on the outside of the pawl seat (501), and the sidewalls of the pawl retaining cups (503) have openings. There are multiple notches (506) for the extension (504) of the pawl (502) to extend to the outside of the pawl limiting cup (503) and connect to the starter cup on the crankshaft of the internal combustion engine; the inner side of the pawl limiting cup (503) is provided with an opening and closing protrusion (507), the opening and closing protrusion (507) extends into the opening and closing groove (505), the opening and closing protrusion (507) is used to cooperate with the opening and closing groove (505) to control the extension (504) of the pawl (502) to extend to the outside of the pawl limiting cup (503) or to extend into the inside of the pawl limiting cup (503).

2. The starter clutch mechanism according to claim 1, characterized in that, The surfaces of the opening and closing protrusion (507) and the opening and closing groove (505) are both arc surfaces.

3. The starter clutch mechanism according to claim 1, characterized in that, The pawl seat (501) is provided with a pin (508), and the pawl (502) is connected to the pin (508).

4. The starter clutch mechanism according to claim 1, characterized in that, The claw seat (501) includes a first plate (509) and a second plate (510) disposed opposite to each other. Both the first plate (509) and the second plate (510) are provided with mounting holes. The claw (502) is rotatably disposed between the first plate (509) and the second plate (510).

5. The starter clutch mechanism according to claim 4, characterized in that, The first plate (509) is provided with a plurality of limiting protrusions (511) arranged in a ring. The end of the claw (502) away from the protrusion (504) is provided with a limiting part (512), and the limiting protrusions (511) abut against the limiting part (512).

6. The starter clutch mechanism according to claim 5, characterized in that, The limiting protrusion (511) is formed by folding the strip structure on the first plate (509).

7. The starter clutch mechanism according to claim 4, characterized in that, The outer side of the second plate (510) is provided with a clamping plate (513), which is mounted on the main shaft (2) by a retaining ring (514).

8. The starter clutch mechanism according to claim 1, characterized in that, The mounting hole is a square hole.

9. The starter clutch mechanism according to claim 1, characterized in that, The number of the claws (502) is 2-8.

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