Modular structure of engine starter

Abstract

The utility model provides a modular structure of an engine starter, and belongs to the technical field of starters. The problems that an existing starter is difficult to maintain and poor in safety are solved. The modular structure of the engine starter comprises an outer shell and a main shaft rotationally arranged in the outer shell, the outer shell is connected with a connecting shell buckled with the outer shell, a stress shaft coaxial with the main shaft is rotationally arranged in the connecting shell, and a one-way assembly is arranged between the stress shaft and the main shaft. The main shaft and the energy storage assembly are arranged in the outer shell, the stress shaft and the one-way assembly are arranged in the connecting shell, the outer shell and the connecting shell are assembled through bolts, and the assembly process is simple; the whole starter does not need to be taken down from the engine during maintenance, and maintenance is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of starter technology and relates to a modular structure of an engine starter. Background Technology

[0002] Mini tillers are widely used for cultivating and harvesting land in rural areas. The engine of a mini tiller needs a starter to start running. For example, a Chinese patent discloses a pull-free starter [authorization announcement number CN203515913U], which includes a housing formed by a chassis and an outer shell. A splined shaft with a clutch ratchet at one end runs through the opposite side of the chassis and the outer shell. A drum is sleeved on the splined shaft. A fixed shaft ratchet, which is rotatably sleeved on the splined shaft, is fixedly installed in the inner hole of the drum near the clutch ratchet end. A movable shaft ratchet, which is keyed to the splined shaft and can mesh with the fixed shaft ratchet, is installed in the inner hole of the drum. A compression spring is installed in the drum to position the movable shaft ratchet. The tooth direction of the movable shaft ratchet is consistent with that of the clutch ratchet. A coil spring is wound on the drum. The two ends of the coil spring are respectively positioned on the housing and the drum. A first gear is fixedly sleeved at one end of the drum. A second gear that meshes with the first gear is positioned in the outer shell. A pawl that can lock the first gear is provided in the outer shell.

[0003] The starter housing is a single unit, and the assembly process from the inside out is complex. The coil spring is connected to the housing, and there is a safety hazard of the coil spring coming loose during assembly. During maintenance, the starter must be removed from the engine and all parts must be disassembled for repair, which is difficult. Removing the coil spring can easily cause the coil to come loose and injure people, which is unsafe. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a modular structure for an engine starter that is easy to assemble and disassemble.

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

[0006] The modular structure of the engine starter includes an outer shell and a main shaft rotatably disposed within the outer shell. A connecting housing is connected to the outer shell and snapped into it. A force-bearing shaft coaxially disposed within the connecting housing is rotatably disposed with respect to the main shaft. A one-way component is provided between the force-bearing shaft and the main shaft. A starter claw assembly is installed on the portion of the force-bearing shaft extending out of the connecting housing.

[0007] The main shaft and energy storage components are housed within the outer casing, while the force-bearing shaft and unidirectional components are housed within the connecting casing. The outer casing and connecting casing are assembled using bolts, simplifying the assembly process. During maintenance, it is not necessary to remove the entire starter from the engine, making maintenance convenient.

[0008] In the modular structure of the engine starter described above, an energy storage component is provided between the main shaft and the outer casing. The energy storage component includes a tray rotatably mounted on the main shaft, a torsion spring disposed between the tray and the main shaft, and a one-way structure disposed between the tray and the outer casing. One end of the torsion spring is fixed on the tray, and the other end of the torsion spring is fixed on the main shaft. When the energy storage component stores energy, the one-way structure is in a locked state.

[0009] The torsion spring is a spiral spring. During energy storage, the main shaft rotates counter-clockwise, and during energy release, it rotates clockwise. When the main shaft rotates clockwise, it drives the tray to rotate clockwise via the torsion spring, at which point the one-way structure is in a slipping state. When the main shaft rotates counter-clockwise, the one-way structure is in a locked state, and the main shaft tightens the torsion spring to complete energy storage.

[0010] Because a tray is mounted on the spindle and a torsion spring is placed between the tray and the spindle, installation and disassembly are convenient, and the structure is simple, the design is reasonable, and the cost is low.

[0011] In the modular structure of the engine starter described above, the unidirectional structure includes a control claw rotatably mounted on the outer casing and several recesses distributed in a ring along the main shaft and mounted on the tray. When the main shaft rotates clockwise, the recesses move the control claw detach from the recesses, and when the main shaft rotates counterclockwise, the control claw detaches from the recesses.

[0012] In the modular structure of the engine starter described above, a rotating shaft is installed on the outer casing, and a drive gear is provided on the part of the rotating shaft that extends into the outer casing. A driven gear that meshes with the drive gear is coaxially fixed on the main shaft. A check structure for limiting the rotation of the main shaft is also provided in the outer casing when storing energy.

[0013] Because of the check valve, the spindle will not rotate during energy storage.

[0014] In the modular structure of the aforementioned engine starter, the check valve includes a ratchet fixed coaxially to the main shaft and a pawl rotatably connected to the outer casing. During energy storage, the ratchet and pawl cause the main shaft to rotate only counterclockwise. The outer casing also contains a drive mechanism for disengaging the pawl from the teeth of the ratchet during energy release. The pawl extends into the teeth of the ratchet under the action of a spring. The drive mechanism is a cable or other similar structure; when it is a cable, it is located at the free end of the pawl and can drive the pawl away from the teeth of the ratchet, thereby disengaging the pawl from the teeth of the ratchet.

[0015] In the modular structure of the engine starter described above, the force-bearing shaft is provided with a shaft hole, one end of the main shaft near the force-bearing shaft is rotatably fitted in the shaft hole, the force-bearing shaft is provided with a mounting cavity, and the one-way component is located in the mounting cavity.

[0016] In the modular structure of the engine starter described above, the one-way component includes a ratchet II located in the mounting cavity and coaxially fixed on the main shaft, and a control pawl II rotatably connected to the force-bearing shaft. The control pawl II engages with the teeth of the ratchet II under the action of a spring.

[0017] When the spindle rotates clockwise, control pawl two engages with the teeth of ratchet two, thereby causing the load-bearing shaft to rotate clockwise together via ratchet two and control pawl two. When the spindle rotates counterclockwise, control pawl two disengages from the teeth of ratchet two, and the load-bearing shaft will not rotate counterclockwise.

[0018] In the modular structure of the engine starter described above, the mounting cavity is located at one end of the force-bearing shaft near the main shaft, and a cover plate is fixed at the opening of the mounting cavity. The ratchet and the control pawl are located on the side of the cover plate facing the force-bearing shaft.

[0019] In the modular structure of the engine starter described above, a limiting step is provided on the force-bearing shaft, and a shaft clip and a washer are provided at the end of the force-bearing shaft away from the main shaft. The starter claw assembly is positioned between the limiting step and the washer.

[0020] In the modular structure of the engine starter described above, a sealing ring is provided between the force-bearing shaft and the connecting housing.

[0021] Compared with existing technologies, the modular structure of this engine starter has the following advantages: the main shaft and energy storage components are housed in the outer casing, and the force-bearing shaft and one-way components are housed in the connecting casing. The outer casing and the connecting casing are assembled with bolts, which simplifies the assembly process. During maintenance, it is not necessary to remove the entire starter from the engine, making maintenance convenient. Since a tray is rotatably mounted on the main shaft and a torsion spring is placed between the tray and the main shaft, installation and disassembly are convenient. Moreover, the structure is simple, the design is reasonable, the cost is low, and the service life is long. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the modular structure of the engine starter provided by this utility model.

[0023] In the diagram, 1. Outer shell; 2. Main shaft; 3. Connecting shell; 4. Force-bearing shaft; 5. Starter claw assembly; 6. Tray; 7. Torsion spring; 8. Control claw one; 9. Rotating shaft; 10. Drive gear; 11. Driven gear; 12. Ratchet one; 13. Pad; 14. Ratchet two; 15. Control claw two; 16. Cover plate; 17. Shaft clip; 18. Washer; 19. Sealing ring. Detailed Implementation

[0024] 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.

[0025] like Figure 1 The modular structure of the engine starter shown includes an outer casing 1 and a connecting casing 3 that is fastened to the outer casing 1. The upper part of the outer casing 1 has a lower connecting flange, and the lower part of the connecting casing 3 has an upper connecting flange. Multiple locking bolts are installed between the upper and lower connecting flanges to connect the outer casing 1 and the connecting casing 3 together. The upper part of the connecting casing 3 has a mounting flange. The entire assembly consisting of the outer casing 1 and the connecting casing 3 is connected to the engine of the tiller via the mounting flange and bolts. This modular design facilitates the installation of internal parts.

[0026] like Figure 1 As shown, a vertically extending main shaft 2 is rotatably mounted inside the outer casing 1 via bearings. A force-bearing shaft 4, coaxially arranged with the main shaft 2, is rotatably mounted inside the connecting housing 3. At least two sealing rings 19 are provided between the force-bearing shaft 4 and the connecting housing 3. An axial limiting part is provided at the lower end of the force-bearing shaft 4, abutting against the lower side of the connecting housing 3. The lower end face of the axial limiting part abuts against the main shaft 2, thereby achieving axial limiting of the force-bearing shaft 4. A starting claw assembly 5 is installed on the part of the force-bearing shaft 4 that extends out of the connecting housing 3. The starting claw assembly 5 includes a turntable and two symmetrically arranged claws rotatably mounted inside the turntable. When the turntable rotates clockwise, the claws extend out from the edge of the turntable due to inertia.

[0027] To achieve axial positioning of the starting claw assembly 5, such as Figure 1 As shown, a limiting step is provided on the force-bearing shaft 4. A shaft clip 17 and a washer 18 are provided above the limiting step on the force-bearing shaft 4. The starting claw assembly 5 is axially positioned between the limiting step and the washer 18. In order to restrict the circumferential rotation of the starting claw assembly 5 relative to the force-bearing shaft 4, the connection between the force-bearing shaft 4 and the starting claw assembly 5 is set as a regular polygon. The starting claw assembly 5 is provided with a matching regular polygonal hole.

[0028] like Figure 1 As shown, a shaft hole is coaxially provided in the force-bearing shaft 4, and an installation cavity communicating with the shaft hole is provided on the lower side of the axial limiting part. A cover plate 16 is provided on the lower side of the installation cavity. The lower side of the cover plate 16 abuts against the main shaft 2. A small shaft is coaxially provided on the main shaft 2, passing through the cover plate 16 from bottom to top and rotatably engaging with the installation cavity in the shaft hole. A one-way component is provided in the installation cavity.

[0029] like Figure 1As shown, the unidirectional assembly includes a ratchet 14 coaxially fixed to the main shaft 2 within the mounting cavity and a control pawl 15 rotatably connected to the force-bearing shaft 4. There are two control pawls 15 arranged symmetrically, and each control pawl 15 engages with the teeth of the ratchet 14 under the action of a spring. The spring is positioned between the cover plate 16 and the control pawl 15. During energy storage, the main shaft 2 rotates counterclockwise; during energy release, it rotates clockwise. When the main shaft 2 rotates clockwise, the control pawl 15 engages with the teeth of the ratchet 14, thereby causing the force-bearing shaft 4 to rotate clockwise together via the ratchet 14 and the control pawl 15. When the main shaft 2 rotates counterclockwise, the control pawl 15 disengages from the teeth of the ratchet 14, preventing the force-bearing shaft 4 from rotating counterclockwise.

[0030] like Figure 1 As shown, a rotating shaft 9 parallel to the main shaft 2 is mounted on the outer casing 1. A driving gear 10 located inside the outer casing 1 is mounted on the upper end of the rotating shaft 9. A driven gear 11, meshing with the driving gear 10, is coaxially fixed to the main shaft 2. When the driving gear 10 rotates, it drives the driven gear 11 to rotate. The outer casing 1 also includes a check valve structure to limit the rotation of the main shaft 2 during energy storage, preventing the main shaft 2 from rotating during energy storage.

[0031] like Figure 1 As shown, the check valve structure includes a ratchet 12 coaxially fixed on the main shaft 2 and a pawl 13 rotatably connected to the outer casing 1. The pawl 13 engages with the teeth of the ratchet 12 under the action of a spring. During energy storage, the ratchet 12 and pawl 13 cause the main shaft 2 to rotate only counterclockwise. A drive mechanism is connected to the pawl 13 to disengage it from the teeth of the ratchet 12 during energy release. In this embodiment, the drive mechanism is a pull cable extending from the outer casing 1, connected to the free end of the pawl 13. Pulling the pull cable drives the pawl 13 away from the teeth of the ratchet 12.

[0032] An energy storage component is provided between the main shaft 2 and the outer casing 1, such as... Figure 1 As shown, the energy storage component includes a tray 6 rotatably mounted on the main shaft 2, a torsion spring 7 disposed between the tray 6 and the main shaft 2, and a one-way structure disposed between the tray 6 and the outer shell 1. The torsion spring 7 is a spiral spring, one end of which is fixed on the tray 6. The main shaft 2 has an axially extending groove, and the other end of the torsion spring 7 extends into and is fixed in the groove. When the energy storage component stores energy, the one-way structure is in a locked state.

[0033] like Figure 1 As shown, the unidirectional structure includes a control claw 8 rotatably mounted on the outer casing 1 and several recesses distributed in a ring along the main shaft 2 and located on the lower side of the tray 6. The control claw 8 extends into the recesses under the action of a spring force. When the main shaft 2 rotates clockwise, the recesses push the control claw 8 to disengage from the recesses, and when the main shaft 2 rotates counterclockwise, the control claw 8 extends into the recesses.

[0034] When the main shaft 2 rotates clockwise, it drives the tray 6 to rotate clockwise through the torsion spring 7. At this time, the one-way structure is in a slipping state. When the main shaft 2 rotates counterclockwise, the one-way structure restricts the rotation of the tray 6, and the main shaft 2 tightens the torsion spring 7 to complete the energy storage.

[0035] like Figure 1 As shown, the pawl lock block is rotatably mounted on the outer casing 1, with one end of the pawl lock block in contact with the pawl 13. The lock block switch is rotatably mounted on the outer casing 1, and the lock block switch is in contact with the pawl lock block.

[0036] When the rotating shaft 9 rotates counterclockwise, the pawl 13 disengages from the ratchet 12 under the action of the pull wire, and drives the main shaft 2 to rotate clockwise through the driving gear 10 and the driven gear 11. The main shaft 2 drives the ratchet 12, the ratchet 2 14 and the torsion spring 7 to rotate clockwise. The torsion spring 7 drives the tray 6 to rotate clockwise. At this time, the control pawl 18 is in a slipping state, and the control pawl 2 15 is engaged with the teeth of the ratchet 2 14, thereby driving the force shaft 4 to rotate clockwise. The force shaft 4 drives the starter pawl assembly 5 to rotate clockwise. The pawl extends and inserts into the square hole of the engine start cup. The pawl drives the engine shaft to rotate clockwise to find the upper starting point.

[0037] When the rotating shaft 9 rotates clockwise, it drives the main shaft 2 to rotate counterclockwise via the driving gear 10 and the driven gear 11. The main shaft 2 drives the ratchet 12, ratchet 2 14 and torsion spring 7 to rotate counterclockwise, causing the control pawl 2 15 to slip on the teeth of ratchet 2 14, keeping the force-bearing shaft 4 stationary, and the pawl still inserted in the square hole of the starter cup. The torsion spring 7 drives the tray 6 to rotate counterclockwise, and the control pawl 1 8 presses against the concave hole to keep the tray 6 stationary. The torsion spring 7 tightens, and the pawl 13 engages with the teeth of ratchet 12 to complete the energy storage before starting the engine.

[0038] Pulling the cable causes pawl 13 to release ratchet 12, torsion spring 7 drives main shaft 2 to rotate clockwise, control pawl 8 presses against the concave hole to keep tray 6 stationary, main shaft 2 drives ratchet 14 to rotate clockwise, control pawl 15 engages with the teeth of ratchet 14, causing force shaft 4 to rotate clockwise, force shaft 4 drives starter pawl assembly 5 to rotate clockwise, and the pawl drives engine shaft to rotate clockwise, completing the start-up.

[0039] In this embodiment, the spring is a compression spring or a torsion spring.

[0040] In other embodiments, the unidirectional structure includes a control claw 8 elastically disposed on the lower side of the tray 6 and a plurality of recesses distributed in a ring along the main shaft 2 and disposed on the outer casing 1, wherein the control claw 8 extends into the recesses under the action of the spring force.

[0041] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A modular structure for an engine starter, characterized in that, It includes an outer shell (1) and a main shaft (2) rotatably disposed within the outer shell (1). A connecting housing (3) is connected to the outer shell (1) and fastened to it. A force-bearing shaft (4) coaxially disposed with the main shaft (2) is rotatably disposed within the connecting housing (3). A one-way component is provided between the force-bearing shaft (4) and the main shaft (2).

2. The modular structure of the engine starter according to claim 1, characterized in that, The force-bearing shaft (4) is provided with a shaft hole, and the end of the main shaft (2) near the force-bearing shaft (4) is rotatably fitted in the shaft hole. The force-bearing shaft (4) is provided with a mounting cavity, and the one-way component is located in the mounting cavity.

3. The modular structure of the engine starter according to claim 2, characterized in that, The one-way component includes a ratchet 2 (14) disposed in the mounting cavity and coaxially fixed on the main shaft (2) and a control claw 2 (15) connected to the force-bearing shaft (4). The control claw 2 (15) engages with the teeth of the ratchet 2 (14) under the action of a spring.

4. The modular structure of the engine starter according to claim 3, characterized in that, The mounting cavity is located at one end of the force-bearing shaft (4) near the main shaft (2). A cover plate (16) is fixed at the opening of the mounting cavity. The ratchet (14) and the control claw (15) are located on the side of the cover plate (16) facing the force-bearing shaft (4).

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