Lawn mower starting pull disc with buffer structure

Abstract

The utility model relates to a lawn mower starting pull disc with a buffer structure, and relates to the field of lawn mowers.The lawn mower starting pull disc comprises a shell, a mounting disc is rotationally connected to the shell, an inner gear ring is arranged on the mounting disc, a rope wheel is rotationally connected to the shell, an outer gear ring is coaxially arranged on the rope wheel, the outer gear ring is meshed with the inner gear ring, and the diameter of the inner gear ring is larger than that of the rope wheel; a first spring is arranged between the shell and the installation disc and used for resetting the installation disc, and a pull rope is wound around the rope wheel. When the pull rope is rapidly pulled, the pull rope drives the rope wheel to rapidly rotate, the rope wheel drives the installation disc to rotate through cooperation between the outer gear ring and the inner gear ring, the diameter of the installation disc is larger than that of the rope wheel, and the installation disc and the rope wheel are eccentrically arranged. And the spring I is arranged between the shell and the mounting disc, so that the impact on the spring caused by too high pull-out speed of the pull rope is relieved, and the service life of the pull rope is prolonged.

Description

Technical fields:

[0001] This utility model belongs to the technical field of lawnmowers, specifically referring to a lawnmower starter pull plate with a buffer structure. Background technology:

[0002] The starter disc mower is the core component of a manually startable engine, typically consisting of a pull cord, spring, pulley, and housing. When the pull cord is pulled quickly, the spring experiences a significant instantaneous impact, which can easily damage the spring and shorten the lifespan of the starter disc. Summary of the Invention:

[0003] The purpose of this invention is to provide a lawnmower starter pull plate with a buffer structure to solve the technical problems mentioned in the background art.

[0004] This utility model is implemented as follows:

[0005] A lawnmower starter pull plate with a buffer structure includes a housing, a mounting plate rotatably connected to the housing, an inner gear ring on the mounting plate, a rope pulley rotatably connected to the housing, an outer gear ring coaxially arranged on the rope pulley, the outer gear ring meshing with the inner gear ring, the diameter of the inner gear ring being larger than the diameter of the rope pulley, a spring assembly between the housing and the mounting plate for resetting the mounting plate, and a pull rope wound on the rope pulley.

[0006] By adopting the above technical solution, when the pull rope is pulled quickly, the pull rope drives the rope wheel to rotate rapidly. The rope wheel drives the mounting plate to rotate through the cooperation between the outer and inner gear rings. The diameter of the mounting plate is larger than the diameter of the rope wheel and is eccentrically set with the rope wheel. When the power at the rope wheel is transmitted to the mounting plate, the rotation speed at the mounting plate is less than the rotation speed of the rope wheel. Placing the spring assembly between the outer shell and the mounting plate helps to alleviate the impact of the pull rope being pulled out too quickly on the spring assembly and helps to improve the service life of the starting pull plate.

[0007] Preferably, the spring assembly includes a mounting portion on the housing, an assembly portion on the mounting plate, and a first spring between the mounting portion and the assembly portion. The first spring drives the mounting plate to rotate via the mounting assembly portion. The first spring is arranged around the axis of the mounting plate. The mounting portion and the assembly portion are rotatably connected. The housing has a first mounting groove for the mounting portion to engage, and the mounting plate has a second mounting groove for the assembly portion to engage. The rotation axis of the assembly portion is coaxial with the mounting plate. The first spring drives the mounting plate to rotate via the mounting assembly portion.

[0008] By adopting the above technical solution and modular design, when the spring assembly needs to be replaced due to corrosion or the end of its lifespan, it can be completely disassembled and replaced with a brand new integrated module, which greatly simplifies the maintenance process and reduces maintenance costs and operational difficulty.

[0009] Preferably, a positioning post is slidably connected to the mounting part, the positioning post slides into or out of the mounting part, a second spring is provided on the mounting part, the second spring presses against the positioning post so that the positioning post tends to move out of the mounting part, and a push rod is provided on the positioning post, the push rod extends out of the mounting part.

[0010] By adopting the above technical solution, when it is necessary to disassemble the spring assembly, the moving push rod drives the positioning pin to extend into the mounting part and disengage from the positioning groove, so that the spring assembly can be removed. When installing the spring assembly, the mounting part and the assembly part are respectively inserted into the mounting groove one and the mounting groove two. The positioning pin is released, and the positioning pin is inserted into the positioning groove under the action of the spring, which facilitates the disassembly of the spring assembly.

[0011] Preferably, the end of the positioning post near the assembly part is machined to form a guide surface, the guide surface is inclined away from the assembly part in a direction away from the second spring, and the guide surface is used to abut against the main shell.

[0012] By adopting the above technical solution, a guide surface is formed on the positioning post. When installing the spring assembly, the outer shell presses against the positioning post to move the positioning post into the positioning post. When the mounting groove one is connected to the positioning groove, the push rod is released, and the positioning post is automatically locked into the positioning groove under the action of the spring two.

[0013] Preferably, a plurality of positioning posts are provided, and the plurality of positioning posts are arranged around the rotation axis of the assembly part. The position and number of the second springs are corresponding to the positioning posts, and the second springs press against the corresponding positioning posts so that the positioning posts tend to move out of the mounting part.

[0014] By adopting the above technical solution, the mounting part is fixed by multiple positioning columns, which helps to improve positioning stability.

[0015] Preferably, a pointer is machined on the assembly part, a window is provided on the mounting part, a scale line is machined on the window, and the projection of the pointer in the direction parallel to the rotation axis of the mounting plate is located on the scale line.

[0016] By adopting the above technical solution, as the usage time increases, the elastic fatigue of spring one increases, and the distance between the pointer and the standard position gradually increases after reset. The degree of fatigue of spring one can be judged by the scale line pointed to by the pointer.

[0017] Preferably, the mounting plate has several weight-reducing grooves.

[0018] By adopting the above technical solution, it is beneficial to reduce the weight of the starter pull plate and to reduce the force required by the user when pulling out the pull rope.

[0019] Preferably, the surface of the pull rope is coated with silicone.

[0020] By adopting the above technical solution and applying a silicone coating to the surface of the pull rope, the pull rope can be protected and its service life can be improved.

[0021] The outstanding advantages of this utility model compared to the prior art are:

[0022] 1. When the pull rope is pulled quickly, the pull rope drives the rope wheel to rotate rapidly. The rope wheel drives the mounting plate to rotate through the cooperation between the outer gear ring and the inner gear ring. The diameter of the mounting plate is larger than the diameter of the rope wheel and is eccentrically set with the rope wheel. When the power at the rope wheel is transmitted to the mounting plate, the rotation speed at the mounting plate is less than the rotation speed of the rope wheel. The spring is set between the outer shell and the mounting plate, which helps to alleviate the impact on the spring caused by the excessive speed of the pull rope and helps to improve the service life of the pull rope.

[0023] 2. This utility model determines the fatigue level of spring one by observing the scale line pointed to by the pointer;

[0024] 3. This utility model adopts a modular design. When the spring assembly needs to be replaced due to corrosion or the end of its life, it can be completely disassembled and replaced with a brand new integrated module, which greatly simplifies the maintenance process and reduces maintenance costs and operating difficulty. Attached image description:

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the overall structure of this utility model from another perspective;

[0027] Figure 3 This is a schematic diagram of the structure of the installation plate exploded open according to the present invention, mainly showing the internal gear ring and the external gear ring;

[0028] Figure 4 This is a sectional view of the present invention, mainly showing the connection structure between the outer shell and the mounting plate;

[0029] Figure 5 yes Figure 4 The enlarged view of section A mainly shows the structure of the spring assembly;

[0030] Figure 6 This is a partial structural diagram of the present invention, mainly showing the structure at the opening.

[0031] Instruction manual drawing reference numerals: 1. Outer shell; 11. Mounting cavity; 12. Cable outlet; 13. Mounting bracket; 14. Limiting ring groove; 15. Mounting groove one; 16. Positioning port; 2. Mounting plate; 21. Weight reduction groove; 22. Internal gear ring; 23. Connector; 24. Mounting groove two; 3. Rope pulley; 31. External gear ring; 4. Pull rope; 41. Silicone coating; 5. Spring assembly; 51. Mounting part; 511. Positioning post; 5111. Push rod; 5112. Guide surface; 512. Opening; 513. Viewing window; 514. Scale line; 52. Assembly part; 521. Limiting part; 522. Pointer; 523. Spring two; 53. Spring one; 54. Spring cavity. Detailed implementation method:

[0032] The present invention will be further described below with reference to specific embodiments:

[0033] This application discloses a lawnmower starter pull plate with a buffer structure; see [link to relevant documentation]. Figure 1 and Figure 2 The system includes a housing 1, which has a mounting cavity 11 and a cable outlet 12 communicating with the mounting cavity 11. A mounting plate 2 is rotatably connected to the housing 1, located inside the mounting cavity 11. The axis of rotation of the mounting plate 2 is horizontal, and the mounting plate 2 has several weight-reducing grooves 21 to reduce its weight. A mounting frame 13 is fixed to the housing 1, and a rope pulley 3 is rotatably connected to the mounting frame 13. Both the mounting frame 13 and the rope pulley 3 are located inside the mounting cavity 11. The rope pulley 3 is rotatably connected to the housing 1 through the mounting frame 13. The axis of rotation of the rope pulley 3 is parallel to the axis of rotation of the mounting plate 2. The distribution direction of the rope pulley 3 and the mounting plate 2 is parallel to the axis of rotation of the rope pulley 3. A pull rope 4 is wound on the rope pulley 3. One end of the pull rope 4 passes through the cable outlet 12 and exits the mounting cavity 11. The end of the rope pulley 3 away from the mounting plate 2 is connected to the motor.

[0034] See Figure 1 and Figure 2 A silicone coating 41 is provided on the surface of the pull rope 4 to protect the pull rope 4 and improve its service life. In this embodiment, the silicone coating 41 is formed by impregnation.

[0035] See Figure 1 and Figure 3An external gear ring 31 is fixed to the outer peripheral wall of the rope pulley 3. The center of the external gear ring 31 is located on the rotation axis of the rope pulley 3. The external gear ring 31 is located on the side of the rope pulley 3 closer to the mounting plate 2. An internal gear ring 22 is fixed to the end of the mounting plate 2 closer to the rope pulley 3. The center of the internal gear ring 22 is located on the rotation axis of the mounting plate 2. The external gear ring 31 is located inside the internal gear ring 22. The diameter of the internal gear ring 22 is larger than the diameter of the external gear ring 31. The external gear ring 31 is located below the center of the internal gear ring 22, and the external gear ring 31 meshes with the internal gear ring 22. In this embodiment, the diameter ratio of the internal gear ring 22 and the external gear ring 31 is close to 2:1, and the teeth of the internal gear ring 22 and the external gear ring 31 are straight teeth.

[0036] See Figure 3 and Figure 4 A spring assembly 5 is installed between the outer casing 1 and the mounting plate 2, and the spring assembly 5 gives the mounting plate 2 a tendency to rotate and return to its original position.

[0037] See Figure 4 The mounting plate 2 has a connector 23 fixed at one end away from the outer gear ring 31. A limiting ring groove 14 is provided on the outer shell 1. The limiting ring groove 14 is set around the rotation axis of the mounting plate 2. The limiting ring groove 14 allows the connector 23 to be inserted into the limiting ring groove 14. The connector 23 moves within the limiting ring groove 14. The mounting plate 2 is rotatably connected to the outer shell 1 through the cooperation between the connector 23 and the limiting ring groove 14.

[0038] See Figure 4 and Figure 5 The spring assembly 5 includes a mounting part 51, an assembly part 52, and a spring 53. The outer casing 1 has a mounting groove 15, and the mounting plate 2 has a mounting groove 24. The distribution direction of the mounting grooves 15 and 24 is parallel to the rotation axis of the mounting plate 2, and the areas of the mounting grooves 15 and 24 are the same. The distribution direction of the mounting part 51 and the assembly part 52 is parallel to the distribution direction of the mounting grooves 15 and 24. The mounting groove 15 is used to engage and fix the mounting part 51, and the mounting groove 24 is used to engage and fix the assembly part 52. The mounting part 51 and the assembly part 52 are rotatably connected. Spring 53 is located between mounting part 51 and assembly part 52. Mounting part 51 and assembly part 52 are spliced ​​to form spring cavity 54. Spring 53 is located in spring cavity 54. Spring 53 is arranged around the rotation axis of assembly part 52. The opposite ends of spring 53 are fixed to mounting part 51 and assembly part 52 respectively. When assembly part 52 rotates relative to mounting part 51, spring 53 causes assembly part 52 to have a tendency to rotate and return to its original position.

[0039] See Figure 4 and Figure 5The assembly part 52 is rotatably connected to the outer shell 1 via the mounting part 51. The rotation axis of the assembly part 52 is coaxial with the rotation axis of the mounting plate 2. A plurality of limiting parts 521 are machined on the assembly part 52. The plurality of limiting parts 521 are spaced apart around the outer periphery of the rotation axis of the mounting part 51. The limiting parts 521 are used to limit the rotation of the assembly part 52 on the mounting plate 2.

[0040] See Figure 4 and Figure 5 The outer casing 1 has several positioning holes 16, which are connected to the mounting groove 15. The mounting part 51 is slidably connected to the positioning post 511. The position and number of the positioning post 511 correspond one-to-one with the position and number of the positioning holes 16. Several positioning posts 511 are arranged around the outer periphery of the mounting part 51. The sliding direction of the positioning post 511 is perpendicular to the distribution direction of the mounting groove 15 and the mounting groove 24. The positioning post 511 slides into or out of the mounting part 51, and the positioning hole 16 is used for the positioning post 511 to be engaged and positioned. Several springs 523 are fixed on the mounting part 51. The position and number of springs 523 correspond one-to-one with the position and number of positioning posts 511. The springs 523 are located at the end of the corresponding positioning post 511 away from the positioning port 16. The opposite ends of the springs 523 are fixedly connected to the positioning post 511 and the mounting part 51, respectively. The extension and retraction direction of the springs 523 is parallel to the sliding direction of the corresponding positioning post 511. The springs 523 cause the positioning post 511 to have a tendency to slide out of the mounting part 51.

[0041] See Figure 4 and Figure 5 A push rod 5111 is fixed at the end of the positioning column 511 away from the assembly part 52. The push rod 5111 extends out of the mounting part 51 and slides to connect with the mounting part 51, making it convenient for the user to control the movement of the positioning column 511.

[0042] In actual use, as the usage time increases, the elastic fatigue of spring 53 increases. When it is necessary to replace spring 53, the moving push rod 5111 drives the positioning pin 511 to extend into the mounting part 51 and disengage from the positioning port 16, so that the spring assembly 5 can be taken out and replaced, which helps to improve maintenance efficiency.

[0043] See Figure 4 and Figure 5 The positioning post 511 has a guide surface 5112 machined at one end near the assembly part 52. The guide surface 5112 is inclined and is inclined away from the assembly part 52 in a direction away from the corresponding spring 523. The guide surface 5112 extends out of the mounting part 51 under the action of the spring 523.

[0044] During installation, the guide surface 5112 extends out of the mounting part 51, and the angle of the assembly part 52 is adjusted so that the limiting part 521 can be inserted into the assembly part 52. During the process of inserting the assembly part 52 and the mounting part 51 into the mounting groove 24 and the mounting groove 15 respectively, the outer shell 1 presses against the guide surface 5112, and the positioning post 511 moves along the inclined direction of the guide surface 5112 and extends into the mounting part 51 until the positioning post 511 is inserted into the corresponding positioning port 16.

[0045] See Figure 4 and Figure 6 An opening 512 is provided on the mounting part 51, and a viewing window 513 is installed inside the mounting part. The viewing window 513 is transparent, and scale lines 514 are machined on the viewing window 513. The scale lines 514 are arranged around the rotation axis of the assembly part 52. A pointer 522 is machined on one end of the assembly part 52 near the mounting part 51. The projection of the pointer 522 in the direction parallel to the rotation axis of the assembly part 52 is located on the viewing window 513 and points to the scale line 514. This allows the user to determine the offset of the initial position of the mounting plate 2 by the position of the pointer corresponding to the scale line 514 after the mounting plate 2 is reset, and thus facilitates the user to determine the degree of elastic fatigue of the spring 53.

[0046] When the lawnmower needs to be started, pull out the pull rope 4. The pull rope 4 drives the rope wheel 3 to rotate. Through the meshing between the outer gear ring 31 and the inner gear ring 22, the outer gear ring 31 is driven to rotate, which in turn drives the assembly part 52 to deform the spring 53. When the pull rope 4 is released, the assembly part 52 gradually rotates and resets under the action of the spring 53, which in turn drives the mounting plate 2 to rotate, causing the rope wheel 3 to rotate and rewind the pull rope 4.

[0047] The implementation principle of a lawn mowing starter pull-out device with a buffer structure according to an embodiment of this application is as follows: By setting a spring assembly 5 and a mounting plate 2 on the outer shell 1, when the pull rope 4 is pulled out quickly, the rope wheel 3 rotates quickly, which in turn drives the mounting plate 2 to rotate. The mounting plate 2 causes the spring 53 inside the spring assembly 5 to contract and deform. Since the diameter of the inner toothed ring 22 is larger than the diameter of the outer toothed ring 31, when the power is transmitted to the mounting plate 2, the rotational speed of the mounting plate 2 is less than the rotational speed of the rope wheel 3. This helps to alleviate the impact on the spring 53 when the pull rope 4 is pulled out quickly, and helps to improve the service life of the spring 53.

[0048] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A lawnmower starter pull plate with a buffer structure, characterized in that: The device includes a housing (1), a mounting plate (2) rotatably connected to the housing (1), an internal gear ring (22) on the mounting plate (2), a rope wheel (3) rotatably connected to the housing (1), an external gear ring (31) coaxially arranged on the rope wheel (3), the external gear ring (31) meshing with the internal gear ring (22), the diameter of the internal gear ring (22) being larger than the diameter of the rope wheel (3), a spring assembly (5) between the housing (1) and the mounting plate (2), the spring assembly (5) being used to reset the mounting plate (2), and a pull rope (4) wound on the rope wheel (3).

2. The lawnmower starter pull plate with a buffer structure according to claim 1, characterized in that: The spring assembly (5) includes a mounting part (51) on the outer shell (1), an assembly part (52) on the mounting plate (2), and a spring (53) between the mounting part (51) and the assembly part (52). The spring (53) drives the mounting plate (2) to rotate through the assembly part (52). The spring (53) is arranged around the axis of the mounting plate (2). The mounting part (51) and the assembly part (52) are rotatably connected. The outer shell (1) has a mounting groove (15) for the mounting part (51) to be inserted into. The mounting plate (2) has a mounting groove (24) for the assembly part (52) to be inserted into. The rotation axis of the assembly part (52) is coaxial with the mounting plate (2).

3. The lawnmower starter pull plate with a buffer structure according to claim 2, characterized in that: A positioning post (511) is slidably connected to the mounting part (51). The positioning post (511) slides into or out of the mounting part (51). The outer shell (1) has a positioning port (16) for the positioning post (511) to be inserted into. A second spring (523) is provided on the mounting part (51). The second spring (523) presses against the positioning post (511) so that the positioning post (511) tends to move out of the mounting part (51). A push rod (5111) is provided on the positioning post (5111). The push rod (5111) extends out of the mounting part (51).

4. The lawnmower starter pull plate with a buffer structure according to claim 3, characterized in that: The positioning post (511) has a guide surface (5112) machined at one end near the assembly part (52). The guide surface (5112) is inclined away from the assembly part (52) in a direction away from the second spring (523). The guide surface (5112) is used to abut against the outer shell (1).

5. The lawnmower starter pull plate with a buffer structure according to claim 4, characterized in that: The positioning posts (511) are provided in a plurality of manner, and the plurality of positioning posts (511) are arranged around the rotation axis of the assembly part (52). The position and number of the second springs (523) are arranged corresponding to the positioning posts (511). The second springs (523) press against the corresponding positioning posts (511) so that the positioning posts (511) tend to move out of the mounting part (51).

6. The lawnmower starter pull plate with a buffer structure according to claim 2, characterized in that: A pointer (522) is machined on the assembly part (52), and a window (513) is provided on the mounting part (51). A scale line (514) is machined on the window (513), and the projection of the pointer (522) in the direction parallel to the rotation axis of the mounting plate (2) points to the scale line (514).

7. The lawnmower starter pull plate with a buffer structure according to claim 1, characterized in that: The mounting plate (2) has several weight-reducing grooves (21).

8. The lawnmower starter pull plate with a buffer structure according to claim 1, characterized in that: The surface of the pull rope (4) is coated with silicone (41).

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