Clutch mechanism of starter

Abstract

The invention provides a clutch mechanism of a starter, and belongs to the technical field of auxiliary starting. The problem that the starter and an engine are inconvenient to disassemble after being used for a long time is solved. The rotating disc is sleeved on a rotating shaft of the starter, the driving piece is fixed on the rotating shaft, at least two friction plates which are approximately in an arc-shaped strip shape are arranged on the rotating disc, one end of each friction plate is hinged on the rotating disc, and a plurality of driving surfaces which are the same as the friction plates in number and are in one-to-one correspondence with the friction plates are arranged on the side part of the driving piece. The driving face is in an arc shape, the distance between each point on the driving face and the center of the driving piece is gradually increased, a spring is arranged between each friction plate and the rotating disc, the other end of each friction plate abuts against the driving face under the action of the spring, and when the driving piece is rotated, the driving piece can overcome the elastic force of the spring to enable the friction plates to be opened outwards around the hinge points. And a limiting structure for limiting the rotation angle of the driving piece relative to the turntable is also arranged between the turntable and the driving piece. The device has the advantage of being convenient to detach from the engine after long-time use.

Description

Technical Field

[0001] This invention belongs to the field of auxiliary starting technology and relates to a clutch mechanism for a starter. Background Technology

[0002] With the continuous development of the economy, the degree of agricultural mechanization is getting higher and higher, and agricultural tillers are being used more and more widely. The engine of an agricultural tiller must be started with the help of auxiliary starting equipment before it can start running. Auxiliary starting devices, also known as starters, include, for example, an engine starter without pulling as disclosed in patent application number 202110528810.4. This device includes a housing, a rotating shaft, a starting shaft, and a friction assembly. The rotating shaft is housed within the housing, and the starting shaft is connected to and drives the rotating shaft to rotate. The friction assembly is mounted on the rotating shaft and includes friction plates and a connecting shaft. The connecting shaft is sleeved on the rotating shaft, and the friction plates are configured to drive the connecting shaft to rotate when the rotating shaft rotates, thereby causing the friction plates to extend outward or retract inward. Furthermore, the friction assembly also includes a roller connected to the connecting shaft. The friction plates also include a contact portion that mates with the roller, and the angle between the contact portion and the line connecting the center of the roller and the center of the connecting shaft is less than or equal to a preset value. Even further, the friction assembly includes a turntable, with one end of the friction plate hinged to the turntable, and the other end connected to the turntable via a tension spring. In use, the connecting shaft is fixed on the rotating shaft, which drives the connecting shaft to rotate. The connecting shaft, through the cooperation of the roller and the contact part of the friction plate, flips the friction plate outward, so that the friction plate contacts the inner wall of the starter cup on the engine. The friction between the friction plate and the inner wall of the starter cup drives the starter cup to rotate, thereby starting the engine.

[0003] This no-pull engine starter works by using friction between a friction plate and the inner wall of the starter cup on the engine to drive the cup's rotation. During each engagement, wear occurs between the friction plate and the starter cup. Each time the friction plate wears a little, the connecting shaft drives it to open at a greater angle to compensate for the wear and ensure contact with the starter cup's inner wall. However, in actual use, it was found that when the friction plate wears to a certain extent, when the connecting shaft drives it to open again, although the friction plate can still engage with the starter cup, it may over-open and become unable to return to its original position. This causes the entire friction assembly to seize up with the starter cup, making it difficult to remove the starter from the engine. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a clutch mechanism for a starter, which solves the problem of inconvenience in disassembling the starter from the engine after prolonged use.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A clutch mechanism for a starter includes a turntable sleeved on a starter shaft, a drive member fixed on the shaft, and at least two generally arc-shaped friction plates on the turntable, one end of each friction plate being hinged to the turntable. The drive member has a plurality of drive surfaces on its side, each corresponding to one of the friction plates. The drive surfaces are arc-shaped, and the distance from each point on the drive surface to the center of the drive member gradually increases. A spring is provided between each friction plate and the turntable, and under the action of the spring, the other end of each friction plate abuts against the drive surface. When the drive member is rotated, it can overcome the spring force and cause the friction plates to open outward around their hinge points. A limiting structure is also provided between the turntable and the drive member to restrict the rotation angle of the drive member relative to the turntable.

[0007] During operation, the shaft drives the drive component to rotate while the turntable remains stationary. Each friction plate, under the action of a spring, abuts against its corresponding drive surface on the drive component. Because the drive surface is arc-shaped and the distance from each point on the drive surface to the center of the drive component gradually increases, the drive surface moves along the other end of the friction plate while the drive component rotates, simultaneously pushing the friction plate to overcome the spring's action and open outwards around its hinge point with the turntable. As the friction plates wear, the angle at which they need to open becomes increasingly larger to compensate for the wear, which means the angle at which the drive component rotates relative to the turntable also becomes increasingly larger.

[0008] This clutch mechanism incorporates a limiting structure between the turntable and the drive component to restrict the rotation angle of the drive component relative to the turntable. In other words, the limiting structure restricts the maximum angle of rotation of the drive component relative to the turntable (in early use, when the friction plates are relatively thick, the drive component only needs a small rotation angle relative to the turntable to drive the friction plates outwards and contact the inner wall of the starter cup; in this case, the limiting structure is ineffective). This prevents the friction plates from failing to return to their original position and seizing with the starter cup when the drive component tries to open them again after the friction plates have worn to a certain extent. Since the starter cup will no longer seize, it means the starter cup will not jam the clutch mechanism, making it very convenient to remove the starter from the engine after the friction plates have worn to a certain extent.

[0009] In the clutch mechanism of the starter described above, the limiting structure includes a positioning post fixed to the turntable and a mating groove that is arc-shaped and concentric with the rotating shaft on the drive component. The positioning post is located at the mating groove, and the length of the arc where the mating groove is located is less than the length of the drive surface.

[0010] During the rotation of the drive component, the contact point between the drive surface and the friction plate gradually shifts from the point closest to the center of the drive component to the point farthest from the center of the drive surface, while the positioning pin gradually moves from one end of the mating groove to the other. By setting the length of the arc of the mating groove to be less than the length of the drive surface, before the drive component has traversed the entire drive surface relative to the friction plate, the positioning pin will move from one end of the mating groove to the other. At this point, the drive component cannot continue to rotate relative to the turntable because it is blocked by the positioning pin. This creates a limitation on the rotation angle of the drive component relative to the turntable, preventing the friction plate from over-opening and becoming unable to return to its original position, thus seizing with the starting cup.

[0011] In the clutch mechanism of the starter described above, the number of positioning pins and mating grooves is the same as that of the friction plates. Each mating groove is located on the side of the driving component, and each positioning pin is located between each friction plate and the driving component.

[0012] The number of positioning pins and mating grooves is the same as that of the friction plates. This means that the drive component and the turntable have multiple points of contact at the same time to limit the drive component's rotation, resulting in more even force distribution and more stable performance. Furthermore, the mating grooves are distributed around the drive component, and the positioning pins are located between each friction plate and the drive component. This arrangement makes the entire clutch mechanism more compact.

[0013] Moreover, the mating groove and driving surface are both located on the side of the driving component, which can better ensure machining accuracy and ensure the reliability of the structure during processing.

[0014] In the clutch mechanism of the starter described above, the turntable includes two parallel connecting plates that are fixedly connected by several connecting posts. The friction plate and the driving component are located between the two connecting plates, and the positioning post is fixedly connected to both connecting plates.

[0015] The above settings enable the positioning pin to both limit the rotation angle of the drive component relative to the turntable and improve the connection strength between the two connecting pieces.

[0016] In the clutch mechanism of the starter described above, as another technical solution, the limiting structure includes a stop post fixed to the drive component and a limiting groove arranged in an arc shape on the turntable and concentric with the rotating shaft. The stop post is located at the limiting groove, and the length of the arc where the limiting groove is located is less than the length of the drive surface.

[0017] During the rotation of the drive component, the contact point between the drive surface and the friction plate gradually shifts from the point closest to the center of the drive component to the point farthest from the center of the drive surface, while the abutment pin gradually shifts from one end of the limiting groove to the other. By setting the length of the arc of the limiting groove to be less than the length of the drive surface, before the drive component has traversed the entire drive surface relative to the friction plate, the abutment pin will move from one end of the limiting groove to the other. At this point, the drive component cannot continue to rotate relative to the turntable because it is blocked by the abutment pin, thus limiting the rotation angle of the drive component relative to the turntable to prevent the friction plate from over-opening and becoming unable to return to its original position, thus seizing with the starting cup.

[0018] In the clutch mechanism of the starter described above, the side of the drive member has the same number of drive portions as the friction plates. Each drive surface is located on one side of each drive portion. The other side of the drive portion has an abutment surface connected to the drive surface at the furthest distance from the center of the drive member. Each friction plate is distributed on the side of the drive member. The drive portion is located between the end of the friction plate driven by the drive member and the hinged end of another friction plate adjacent to it.

[0019] Each friction plate is distributed on the side of the drive member, with the end of the friction plate driven by the drive member adjacent to the hinged end of another friction plate. Each drive section of the drive member is located between the end of the friction plate driven by the drive member and the hinged end of the adjacent friction plate. With this arrangement, when the shaft drives the drive member to rotate in one direction, the drive surface on the drive section can drive the friction plates to open outwards; when the shaft drives the drive member to rotate in another direction, the abutment surface on the drive section abuts against the hinged end of another friction plate, preventing the drive member from rotating relative to the turntable. This arrangement perfectly meets the actual needs of the starter, allowing the friction plates to open only during the spring release phase, without opening during the spring charging phase.

[0020] In the clutch mechanism of the starter described above, a relief surface is connected between two adjacent drive units. One end of the relief surface is connected to the drive surface of the drive unit, and the other end of the relief surface is connected to the abutment surface of another drive unit. Each mating groove is located at each relief surface.

[0021] By setting the clearance surface, when the driving component rotates to drive each friction plate to open outward, it can be ensured that the driving component will not touch the hinge end of the friction plate, thus ensuring the reliability of the structure.

[0022] In the clutch mechanism of the starter described above, the spring is a tension spring, with its two ends connected to two adjacent friction plates respectively. The connection position of the spring to one of the friction plates is close to the end of the friction plate that is driven by the driving component, and the connection position of the spring to the other friction plate is close to the hinge end of the friction plate.

[0023] In the clutch mechanism of the starter described above, the friction plate includes a body that is a metal stamping part with a U-shaped cross-section and a friction body fixed to the outer side of the body. A roller is rotatably connected to one end of the body driven by the driving component through a connecting shaft, and the roller extends out of the body and abuts against the driving surface.

[0024] The driving surface moves along the roller, simultaneously pushing the friction plate outward around its hinge point with the turntable, overcoming the spring's action. The roller design ensures smoother engagement and less wear between the friction plate and the driving component. The friction plate comprises a U-shaped metal stamped body and a friction element fixed to the outer surface of the body. This design allows the internal space of the body to be used to install the roller, eliminating the need for a separate mounting location, thus simplifying the structure and manufacturing process.

[0025] Compared with existing technologies, the clutch mechanism of this starter has the following advantages:

[0026] 1. A limiting structure is set on the turntable to limit the rotation angle of the drive component relative to the turntable. In other words, the limiting structure will limit the maximum rotation angle of the drive component relative to the turntable. This can prevent the friction plate from not returning to its original position and seizing with the starter cup when the drive component drives the friction plate to open again after the friction plate has worn to a certain extent. This will prevent the starter cup from jamming the clutch mechanism, so that the starter can be easily removed from the engine.

[0027] 2. The friction plate is configured to include a body made of metal stamping with a U-shaped cross-section and a friction body fixed to the outer side of the body. In this way, the space inside the body can be used to install the roller, eliminating the need to set up a separate position for installing the roller, thereby simplifying the structure and manufacturing process. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the starter.

[0029] Figure 2 This is another angled view of the starter.

[0030] Figure 3 This is a top view of the starter.

[0031] Figure 4 yes Figure 3 Sectional view along the AA direction.

[0032] Figure 5 This is a three-dimensional schematic diagram of the clutch mechanism of the starter in Embodiment 1.

[0033] Figure 6 This is an exploded diagram of the clutch mechanism.

[0034] Figure 7 yes Figure 4 Sectional view along the BB direction.

[0035] Figure 8 This is a cross-sectional view of the clutch mechanism when the driving component opens the friction plates and they are positioned by the locating pins (the sectional direction is the same as...). Figure 7 same).

[0036] Figure 9 This is a 3D schematic diagram of the driving component.

[0037] Figure 10 This is a three-dimensional schematic diagram of the friction plate.

[0038] In the diagram, 1. Outer shell; 2. Rotating shaft; 3. Starting shaft; 4. Driving gear; 5. Driven gear; 6. Spring box; 7. Spring; 8. Ratchet; 9. Stop plate; 10. Mounting post; 11. Positioning plate; 11a. Positioning post; 12. Return torsion spring; 13. Rotating wheel; 14. Turntable; 14a. Connecting plate; 14b. Connecting post; 15. Driving component; 15a. Driving part; 15a1. Driving surface; 15a2. Abutting surface; 15b. Mating groove; 15c. Connecting hole; 15d. Leaving surface; 15e. Leaving groove; 16. Friction plate; 16a. Body; 16b. Friction body; 17. Pivot shaft; 18. Spring; 19. Positioning post; 20. Roller; 21. Connecting shaft. Detailed Implementation

[0039] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0040] Example 1

[0041] like Figures 1-4As shown, a clutch mechanism for a starter includes a cover-shaped housing 1, a rotating shaft 2 rotatably disposed within the housing 1, and a starter shaft 3 rotatably disposed outside the housing 1 and parallel to the rotating shaft 2. One end of the starter shaft 3 is located inside the housing 1 and is fixedly connected to a drive gear 4, while one end of the rotating shaft 2 is fixedly connected to a driven gear 5 that meshes with the drive gear 4. A spring box 6 is fixed inside the housing 1, and a spring 7 is disposed inside the spring box 6. The rotating shaft 2 passes through the spring box 6, and the inner end of the spring 7 is connected to the rotating shaft 2, while the outer end of the spring 7 is connected to the spring box 6. Thus, when the rotating shaft 2 rotates in one direction, it can cause the spring 7 to tighten. Furthermore, a ratchet 8 is fixed to the other end of the starter shaft 3 (that is, when the starter shaft 3 rotates, the ratchet 8 will also rotate at the same time, and there will be no relative rotation). A stop plate 9 is hinged on the outer shell 1. Specifically, a mounting post 10 is protruding on the outer shell 1. The center of the stop plate 9 is sleeved on the mounting post 10. A positioning plate 11 is integrally formed on the stop plate 9. The positioning plate 11 extends in one direction along the edge of the stop plate 9. The positioning plate 11 has a positioning post 11a. A return torsion spring 12 is also sleeved on the mounting post 10. The elastic force of the return torsion spring 12 acts on the stop plate 9, causing the positioning post 11a to be engaged in the teeth on the outside of the ratchet 8 and form a one-way rotation. In this embodiment, the positioning post 11a includes a positioning flange that bends downward and inward from one side of the positioning piece 11 into an L-shape and a rotating wheel 13 hinged in the positioning flange. The rotating wheel 13 is located between two adjacent teeth on the outer side of the ratchet 8, and when the ratchet 8 rotates, the outer wall of the teeth on the outer side of the ratchet 8 can slide over the rotating wheel 13.

[0042] like Figures 4-10As shown, the clutch mechanism includes a turntable 14 sleeved on a rotating shaft 2, a drive member 15 fixed on the rotating shaft 2, and at least two generally arc-shaped friction plates 16 on the turntable 14. One end of the friction plate 16 is hinged to the turntable 14 via a pivot shaft 17. The drive member 15 has a number of drive surfaces 15a1 that are the same as and correspond one-to-one with the friction plates 16 on its side. The drive surfaces 15a1 are arc-shaped, and the distance from each point on the drive surface 15a1 to the center of the drive member 15 gradually increases. A spring 18 is provided between each friction plate 16 and the turntable 14, and under the action of the spring 18, the other end of the friction plate 16 abuts against the drive surface 15a1. When the drive member 15 is rotated, the drive member 15 can overcome the elastic force of the spring 18 and cause the friction plate 16 to open outward around its hinge point. A limiting structure is also provided between the turntable 14 and the drive member 15 to limit the rotation angle of the drive member 15 relative to the turntable 14. In this embodiment, each friction pad 16 is distributed on the side of the drive member 15. The spring 18 is a tension spring, and its two ends are respectively connected to two adjacent friction pads 16. The connection position of the spring 18 with one of the friction pads 16 is close to the end of the friction pad 16 driven by the drive member 15, and the connection position of the spring 18 with the other friction pad 16 is close to the hinge end of the friction pad 16. The drive member 15 has a clearance groove 15e for each spring 18 to pass through. The friction pad 16 includes a body 16a, which is a metal stamping part with a U-shaped cross-section, and a friction body 16b fixed to the outer side of the body 16a. The material of the friction body 16b is the same as that of existing automobile brake pads. A roller 20 is rotatably connected to the end of the body 16a driven by the drive member 15 through a connecting shaft 21, and the roller 20 extends out of the body 16a and abuts against the drive surface 15a1. The pivot shaft 17 passes through the other end of the body 16a. Furthermore, the driving component 15 is block-shaped, and the limiting structure includes a positioning post 19 fixed to the turntable 14 and an arc-shaped mating groove 15b on the driving component 15, concentric with the rotating shaft 2. The positioning post 19 is located at the mating groove 15b, and the length of the arc of the mating groove 15b is less than the length of the driving surface 15a1. The number of positioning posts 19 and mating grooves 15b is the same as that of the friction plates 16. Each mating groove 15b is located on the side of the driving component 15, and each positioning post 19 is located between each friction plate 16 and the driving component 15. The turntable 14 includes two parallel connecting plates 14a fixedly connected by several connecting posts 14b. Both the friction plates 16 and the driving component 15 are located between the two connecting plates 14a, and the positioning post 19 is fixedly connected to both connecting plates 14a. In practice, one of the connecting pieces 14a abuts against the spring box 6, and a retaining ring is fixed on the rotating shaft 2. The other connecting piece 14a abuts against the retaining ring. In other words, the turntable 14 is axially fixed between the spring box 6 and the retaining ring.Both connecting pieces 14a have round holes through which the rotating shaft 2 passes, and the driving member 15 has a connecting hole 15c through which the rotating shaft 2 passes and forms a circumferentially fixed connection hole with it. The cross-section of the part of the rotating shaft 2 passing through the connecting hole 15c is square, and the shape of the connecting hole 15c is the same as the shape of this part of the rotating shaft 2.

[0043] Furthermore, such as Figure 7 , Figure 8 and Figure 9 As shown, the driving member 15 has the same number of driving portions 15a as the friction plates 16 on its side. Each driving surface 15a1 is located on one side of each driving portion 15a. The other side of each driving portion 15a has an abutment surface 15a2 connected to the driving surface 15a1 at the furthest point from the center of the driving member 15. Each friction plate 16 is distributed on the side of the driving member 15. The driving portion 15a is located between the end of the friction plate 16 driven by the driving member 15 and the hinged end of another adjacent friction plate 16. A clearance surface 15d connects two adjacent driving portions 15a. One end of the clearance surface 15d is connected to the driving surface 15a1 of the driving portion 15a, and the other end of the clearance surface 15d is connected to the abutment surface 15a2 of the other driving portion 15a. Each mating groove 15b is located at each clearance surface 15d.

[0044] In use, the crank handle is attached to the end of the starter shaft 3 where the ratchet 8 is fixed and rotated clockwise. The starter shaft 3 drives the rotating shaft 2 to rotate counterclockwise through the engagement of the drive gear 4 and the driven gear 5, thereby tightening the coil spring 7. During this process, the drive member 15 directly drives the entire turntable 14 to rotate together by abutting the abutting surface 15a2 on the drive part 15a against the hinged end of the friction plate 16, and the individual friction plates 16 do not open outwards.

[0045] After the coil spring 7 has fully charged, the stop plate 9 is operated to disengage the positioning pin 11a from the ratchet 8. The spring force of the coil spring 7 is released instantaneously, causing the rotating shaft 2 and the driving component 15 to rotate clockwise. At this time, each driving surface 15a1 on the driving component 15 begins to contact the roller 20 on the corresponding friction plate 16. Since the driving surface 15a1 is arc-shaped and the distance from each point on the driving surface 15a1 to the center of the driving component 15 gradually increases, the driving surface 15a1 will move along the corresponding roller 20 while pushing each friction plate 16 to overcome the effect of the spring 18 and gradually open outward around the hinge point with the turntable 14. During the process of the driving component 15 driving each friction plate 16 to open outward, the mating groove 15b moves along the positioning pin 19. Specifically, the position where the driving surface 15a1 contacts the friction plate 16 gradually shifts from the point on the driving surface 15a1 closest to the center of the driving component 15 to the point on the driving surface 15a1 farthest from the center of the driving component 15, while the positioning pin 19 gradually shifts from one end of the mating groove 15b to the other end.

[0046] The positioning pin 19 and the mating groove 15b limit the maximum angle of rotation of the drive component 15 relative to the turntable 14 (in the early stages of use, the friction plate 16 is relatively thick, and the drive component 15 only needs to rotate a small angle relative to the turntable 14 to drive the friction plate 16 to open outward and contact the inner wall of the starter cup; at this time, the positioning pin 19 is ineffective). This prevents the friction plate 16 from failing to return to its original position and seizing with the starter cup when the drive component 15 drives the friction plate 16 to open again after it has worn to a certain extent. Since it will no longer seize with the starter cup, it means that the starter cup will not jam the clutch mechanism, making it very convenient to remove the starter from the engine after the friction plate 16 has worn to a certain extent. Specifically, the length of the arc where the mating groove 15b is located is less than the length of the driving surface 15a1. Before the driving member 15 has traversed the entire driving surface 15a1 relative to the friction plate 16, the positioning pin 19 will move from one end of the mating groove 15b to the other end. At this time, the driving member 15 cannot continue to rotate relative to the turntable 14 because it is blocked by the positioning pin 19 (this state is as follows). Figure 8 As shown in the figure, this creates a limitation on the rotation angle of the drive unit 15 relative to the turntable 14.

[0047] Example 2

[0048] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the limiting structure includes a stop post fixed to the driving member 15 and a limiting groove that is arc-shaped and concentric with the rotating shaft 2 on the turntable 14. The stop post is located at the limiting groove, and the length of the arc where the limiting groove is located is less than the length of the driving surface 15a1.

[0049] During the rotation of the drive component 15, the contact point between the drive surface 15a1 and the friction plate 16 gradually shifts from the point closest to the center of the drive component 15 on the drive surface 15a1 to the point farthest from the center of the drive component 15 on the drive surface 15a1, while the abutment post gradually shifts from one end of the limiting groove to the other end. By setting the length of the arc of the limiting groove to be less than the length of the drive surface 15a1, before the drive component 15 has traversed the entire drive surface 15a1 relative to the friction plate 16, the abutment post will first move from one end of the limiting groove to the other end. At this time, the drive component 15 cannot continue to rotate relative to the turntable 14 because the abutment post is blocked, thus forming a limitation on the rotation angle of the drive component 15 relative to the turntable 14, so as to avoid the friction plate 16 from being unable to return to its original position due to excessive opening and seizing with the starting cup.

[0050] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A clutch mechanism for a starter, comprising a turntable (14) sleeved on a starter shaft (2), a drive member (15) fixed on the shaft (2), and at least two generally arc-shaped friction plates (16) on the turntable (14), one end of each friction plate (16) being hinged to the turntable (14), characterized in that, The drive member (15) has a number of drive surfaces (15a1) on its side that are the same as and correspond one-to-one with the friction plates (16). The drive surfaces (15a1) are arc-shaped and the distance from each point on the drive surface (15a1) to the center of the drive member (15) gradually increases. Each friction plate (16) is provided with a spring (18) between it and the turntable (14). Under the action of the spring (18), the other end of the friction plate (16) abuts against the drive surface (15a1). When the drive member (15) is rotated, the drive member (15) can overcome the elastic force of the spring (18) and make the friction plate (16) open outward around its hinge point. A limiting structure is also provided between the turntable (14) and the drive member (15) to limit the rotation angle of the drive member (15) relative to the turntable (14).

2. The clutch mechanism of a starter according to claim 1, characterized in that, The limiting structure includes a positioning post (19) fixed to the turntable (14) and a mating groove (15b) that is arc-shaped and concentric with the rotating shaft (2) on the driving member (15). The positioning post (19) is located at the mating groove (15b), and the length of the arc where the mating groove (15b) is located is less than the length of the driving surface (15a1).

3. The clutch mechanism of a starter according to claim 2, characterized in that, The number of positioning pins (19) and mating grooves (15b) is the same as that of friction plates (16). Each mating groove (15b) is located on the side of the drive member (15), and each positioning pin (19) is located between each friction plate (16) and the drive member (15).

4. The clutch mechanism of a starter according to claim 3, characterized in that, The turntable (14) includes two parallel connecting pieces (14a) that are fixed together by several connecting posts (14b). The friction plate (16) and the driving component (15) are located between the two connecting pieces (14a). The positioning post (19) is fixed together with the two connecting pieces (14a).

5. The clutch mechanism of a starter according to claim 1, characterized in that, The limiting structure includes an abutment post fixed to the drive member (15) and a limiting groove arranged in an arc shape on the turntable (14) and concentric with the rotating shaft (2). The abutment post is located at the limiting groove, and the length of the arc where the limiting groove is located is less than the length of the drive surface (15a1).

6. The clutch mechanism of a starter according to claim 2, characterized in that, The drive member (15) has the same number of drive portions (15a) on its side as the friction plates (16). Each drive surface (15a1) is located on one side of each drive portion (15a). The other side of the drive portion (15a) has an abutment surface (15a2) connected to the drive surface (15a1) at the furthest point from the center of the drive member (15). Each friction plate (16) is distributed on the side of the drive member (15). The drive portion (15a) is located between the end of the friction plate (16) driven by the drive member (15) and the hinge end of another friction plate (16) adjacent to it.

7. The clutch mechanism of a starter according to claim 6, characterized in that, A clearance surface (15d) is connected between two adjacent drive units (15a). One end of the clearance surface (15d) is connected to the drive surface (15a1) of the drive unit (15a), and the other end of the clearance surface (15d) is connected to the abutment surface (15a2) of another drive unit (15a). Each mating groove (15b) is located at each clearance surface (15d).

8. The clutch mechanism of a starter according to claim 2 or 5, characterized in that, The spring (18) is a tension spring. The two ends of the spring (18) are respectively connected to two adjacent friction plates (16). The connection position of the spring (18) with one of the friction plates (16) is close to the end of the friction plate (16) driven by the driving member (15). The connection position of the spring (18) with the other friction plate (16) is close to the hinge end of the friction plate (16).

9. The clutch mechanism of a starter according to claim 2 or 5, characterized in that, The friction plate (16) includes a body (16a) that is a metal stamping part with a U-shaped cross-section and a friction body (16b) fixed to the outer side of the body (16a). A roller (20) is rotatably connected to one end of the body (16a) driven by the driving member (15) through a connecting shaft (21), and part of the roller (20) extends out of the body (16a) and abuts against the driving surface (15a1).

Images