A cable buffering mechanism of a clutch

Abstract

The utility model relates to agricultural machine clutch technical field discloses a kind of pull line buffer mechanisms of clutch, including cable and clutch rocker, it is characterized in that, the cable is through upper connecting piece and lower connecting piece swing connection clutch rocker, compression spring is set on the lower connecting piece, the upper connecting piece is equipped with buffer groove, the lower connecting piece can be reciprocating in the buffer groove by compression spring. Can adapt to clutch rocker stroke change, make clutch normal transmission, with the advantage of improving clutch service life.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery clutch technology, specifically to a clutch cable buffer mechanism. Background Technology

[0002] The clutch is a key component in the transmission system of agricultural machinery. Its core function is to smoothly engage and disengage the engine power from the working device (such as the harvester or rotary tiller blades), thereby meeting the operational needs of starting, shifting gears, and temporarily stopping the machinery. Among various transmission methods, belt drives are widely used in small and medium-sized agricultural machinery due to their simple structure, low cost, and ability to buffer and absorb vibrations. The clutch used with belt drives typically employs a tensioner pulley to press or release the drive belt, transmitting or cutting off power by controlling the tension of the drive belt.

[0003] Chinese patent document CN207156937U discloses a clutch and brake system, including a handle, a transmission assembly, a brake assembly, and a wheel. The rear end of the handle is bent backward to form a hand grip. The transmission assembly includes a transmission belt connected between a drive wheel and a driven wheel. A transmission belt clutch assembly for controlling the tension of the transmission belt is located in the middle of the transmission belt. A clutch pin is also fixed in the middle of the clutch handle, and a clutch pull rope is hinged to the clutch pin. In the clutch assembly, a tension wheel presses against the transmission belt, and the tension wheel shaft is fixed to the upper end of a clutch swing arm. The middle part of the clutch swing arm is hinged to the machine body, and the lower end of the clutch swing arm is connected to the clutch pull rope. A clutch spring pulls the upper end of the clutch swing arm backward.

[0004] For example, Chinese patent document CN204099524U discloses a tensioning clutch mechanism for agricultural power machinery, which consists of a clutch rocker arm, a return spring, a connecting fork, a pull rod, a pull rod joint, a pull spring, a clutch operating lever, a tension connecting plate, a support, and a tension wheel. The clutch rocker arm is slidably mounted on the fixed shaft of the frame, and the tension wheel is mounted on the clutch rocker arm. The clutch rocker arm is connected to the return spring and the connecting fork via a pin. The connecting fork is connected to the tension connecting plate via a pull rod, a pull rod joint, and a pull spring. The tension connecting plate is mounted on the clutch operating lever, and the clutch operating lever is mounted on the support. The support is fixed to the frame.

[0005] In existing technologies, tension springs are used to control the clutch rocker arm. Due to internal wear of the clutch, installation errors, or mechanical errors, the travel of the clutch rocker arm increases. Since the pedal travel is fixed, the travel of the tension spring will decrease, resulting in insufficient tension provided by the tension spring. The positive pressure of the tension spring on the clutch drops significantly, which seriously affects the clutch engagement transmission. Utility Model Content

[0006] To solve the technical problem of clutch failure due to changes in clutch rocker arm stroke, this utility model provides a clutch cable buffer mechanism, including a cable and a clutch rocker arm. The cable is movably connected to the clutch rocker arm via an upper connector and a lower connector. A compression spring is sleeved on the lower connector, and a buffer groove is provided on the upper connector. The lower connector can reciprocate within the buffer groove via the compression spring.

[0007] Preferably, the lower connector includes a movable rod and a connecting rod. A portion of the movable rod is fitted with the compression spring and disposed within the buffer groove, while the other portion is connected to the connecting rod, which is connected to a cable.

[0008] In order to adjust the preload of the compression spring, a locking nut is provided on the movable rod outside the buffer groove.

[0009] To facilitate the generation of the preload of the compression spring, a limiting platform is provided at the end of the movable rod in the buffer groove. One end of the compression spring rests on the limiting platform, and the other end rests in the buffer groove.

[0010] To facilitate adjustment of the cable's travel, the movable rod and the connecting rod are connected by threads.

[0011] To facilitate the connection between the cable and the connecting rod, the end of the cable is a spherical structure. After passing through the threaded hole of the connecting rod, the cable is confined within the connecting rod by the spherical structure.

[0012] Preferably, the upper connector is a U-shaped connector, and the top is movably connected to the clutch rocker arm via a pin.

[0013] This utility model has the following beneficial effects: This invention can generate preload in advance, thereby significantly reducing the stiffness of the spring while ensuring the tension remains constant. This significantly reduces the impact of changes in the working arm stroke caused by cable adjustment, individual differences in parts, and wear on the internal positive pressure. Compared with a tension spring, for the same 2mm stroke change, the tension of the tension spring is reduced by 25%, which means that the clutch cannot receive the positive pressure provided by the subsequent tension spring after gear shifting, and the clutch cannot transmit kinetic energy normally. In contrast, this invention reduces the tension by 5%, which has virtually no impact on the positive pressure of clutch engagement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an embodiment of the cable buffer mechanism of the clutch of this utility model; Figure 2 for Figure 1 A sectional view; Figure 3 This is a schematic diagram of the theoretical numerical representation of the cable in the embodiment. Figure 4 This is a schematic diagram of the actual numerical values ​​of the cable in the embodiment; Figure 5 This is a comparative numerical diagram of the cable theory; Figure 6 This is a schematic diagram showing the actual values ​​of the cables for comparison. Detailed Implementation

[0015] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: cable 1, clutch rocker arm 2, U-shaped connector 3, lower connector 4, movable rod 401, connecting rod 402, locking nut 403, limiting platform 404, compression spring 5, buffer groove 6, and pin 8. Example

[0016] like Figure 1 and 2 As shown, a clutch cable buffer mechanism includes a cable 1 and a clutch rocker arm 2. The cable 1 is movably connected to the clutch rocker arm 2 through a U-shaped connector 3 and a lower connector 4. A compression spring 5 is sleeved on the lower connector 4. A buffer groove 6 is provided on the U-shaped connector 3. The lower connector 4 can reciprocate within the buffer groove 6 through the compression spring 5. The compression spring 5 provides preload force for the cable 1.

[0017] The lower connecting member 4 includes a movable rod 401 and a connecting rod 402. The upper part of the movable rod 401 is fitted with the compression spring 5 and is disposed in the buffer groove 6. The lower part of the movable rod 401 is connected to the upper part of the connecting rod 402. The bottom of the connecting rod 402 is connected to the cable 1.

[0018] A locking nut 403 is provided on the movable rod 401 outside the buffer groove 6.

[0019] The end of the movable rod 401 in the buffer groove 6 is provided with a limiting platform 404. One end of the compression spring 5 rests on the limiting platform 404, and the other end rests in the buffer groove 6.

[0020] The movable rod 401 is threaded into the threaded hole of the connecting rod 402. When it is necessary to adjust the length of the cable 1, the connecting rod 402 and the movable rod 401 can be adjusted by rotating them.

[0021] The end of the cable 1 is a spherical structure. After passing through the threaded hole of the connecting rod 402, the cable 1 is limited within the connecting rod 402 by the spherical structure.

[0022] The top of the U-shaped connector 3 is movably connected to the clutch rocker arm 2 via a pin 8.

[0023] like Figure 3 and4 As shown, before designing the compression spring 5, the stiffness of the compression spring 5 needs to be theoretically calculated: the rated required tension is 1000N, the spring preload is 800N, the travel of the cable 1 controlled by the clutch pedal is a fixed value of 20mm, and the travel required to control the clutch rocker arm 2 is a fixed value of 28mm. Therefore, the required extension length of the compression spring 5 is 28-20=8mm. The stiffness of the compression spring is determined according to the requirements: (1000-800)÷8=25N / mm (once determined, this value is determined by the compression spring 5 itself and cannot be changed).

[0024] When the clutch wears out, the travel of the clutch rocker arm 2 increases, which will offset the 2mm travel of the compression spring 5. The actual travel of the compression spring 5 is 28-22=6mm. The spring stiffness is 25N / mm. The spring preload is 800N. The actual tension of the compression spring is 800+25×6=950N.

[0025] This means that after a period of use, due to internal wear and other reasons, the working arm stroke increases, but the change in the compression spring tension is small and has almost no impact on use.

[0026] Comparative Example like Figure 5 and 6 As shown, cable 1 is directly connected to clutch rocker arm 2 via tension spring.

[0027] Before designing the tension spring, the stiffness of the tension spring needs to be theoretically calculated: the rated required tension is 1000N, the travel of the cable 1 controlled by the clutch pedal is a fixed value of 20mm, and the travel required to control the clutch rocker arm 2 is a fixed value of 28mm. Therefore, the required extension length of the tension spring is 28-20=8mm. The tension spring stiffness is determined according to the requirements: 1000÷8=125N / mm (once determined, this value is determined by the tension spring itself and cannot be changed).

[0028] When the clutch wears out, the travel of clutch rocker arm 2 increases, which will offset the travel of the tension spring by 2mm. The actual travel of the tension spring is 28-22=6mm, the spring stiffness is 125N / mm, and the actual tension of the spring is 125×6=750N.

[0029] This means that after a period of use, due to internal wear and other reasons, the spring tension will drop significantly as the working arm stroke increases, and the positive pressure will drop significantly, seriously affecting the use of the clutch.

[0030] In summary, compared with the tension spring, for the same 2mm stroke change, the tension of the tension spring is reduced from 1000N to 750N. This utility model, by compressing the preload of the spring 5 by 800N and combining it with the 150N generated by its own spring stiffness, actually reduces the tension by only 50N. When the clutch is engaged, it can still provide sufficient tension to ensure the positive pressure of the clutch.

[0031] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A clutch cable buffer mechanism, comprising a cable and a clutch rocker arm, characterized in that, The cable is movably connected to the clutch rocker arm via an upper connector and a lower connector. A compression spring is fitted on the lower connector, and a buffer groove is provided on the upper connector. The lower connector can reciprocate within the buffer groove via the compression spring.

2. The clutch cable buffer mechanism according to claim 1, characterized in that: The lower connector includes a movable rod and a connecting rod. A portion of the movable rod is fitted with the compression spring and disposed within the buffer groove, while the other portion is connected to the connecting rod, which is connected to a cable.

3. The clutch cable buffer mechanism according to claim 2, characterized in that: A locking nut is provided on the movable rod outside the buffer groove.

4. The clutch cable buffer mechanism according to claim 3, characterized in that: The end of the movable rod in the buffer groove is provided with a limiting platform, and one end of the compression spring rests on the limiting platform, while the other end rests in the buffer groove.

5. The clutch cable buffer mechanism according to claim 4, characterized in that: The movable rod and the connecting rod are connected by threads.

6. The clutch cable buffer mechanism according to claim 5, characterized in that: The end of the cable is a spherical structure, and the cable is confined within the connecting rod by the spherical structure after passing through the threaded hole of the connecting rod.

7. The clutch cable buffer mechanism according to claim 6, characterized in that: The upper connector is a U-shaped connector, and the top is movably connected to the clutch rocker arm via a pin.

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