Clutch and brake mechanism for an agricultural machine

Abstract

The utility model relates to agricultural machinery transmission device technical field discloses a kind of clutch and brake mechanism of agricultural machinery, including pedal, clutch pull wire and brake pull wire, the pedal is connected brake pull wire by linkage one, it is characterized in that, linkage one is also equipped with gyro wheel on it, the gyro wheel top is equipped with clutch arm cam, clutch arm cam is connected clutch pull wire by linkage two, pedal first half course drives linkage one to pull brake pull wire to change from slack to tight, simultaneously drive gyro wheel to rotate clutch arm cam and pull tight clutch pull wire, pedal second half course continuously drives linkage one to pull tight brake pull wire. It is avoided that driver clutch and brake misoperation, avoid brake pull wire and clutch pull wire fatigue, improve service life, simple structure, small and exquisite.

Description

Technical Field

[0001] This utility model relates to the technical field of agricultural machinery transmission devices, specifically to a clutch and braking mechanism for agricultural machinery. Background Technology

[0002] In agricultural machinery, the clutch and brake pedals are usually operated with both feet. The left foot controls the clutch pedal, and the right foot controls the brake pedal (there are usually two that can be linked) and the accelerator pedal. When you need to stop, you need to press the clutch first to disengage it, and then press the brake. When you need to start the machinery, you need to release the brake first, and then control the clutch gear to engage for power transmission.

[0003] Clutch pedal: Connects or disconnects the power transmission between the engine and the transmission system (gearbox, drive wheels). Depressing (disengaging): Cuts off power. The engine idles, and power cannot be transmitted to the wheels. At this time, you can smoothly shift gears or start the engine without moving the vehicle forward. Releasing (engaging): Transmits power. The engine's power is gradually transmitted to the gearbox through the friction between the clutch plates, ultimately driving the wheels.

[0004] Brake pedal: It generates resistance to the moving agricultural machinery, dissipating its kinetic energy, thereby slowing down or stopping it. When the brake pedal is pressed, the hydraulic or pneumatic system pushes the brake pads (or brake shoes) to tightly clamp the brake disc (or brake drum) that rotates with the wheel, generating a huge frictional force, which reduces the wheel speed until it stops.

[0005] Chinese patent document CN220653932U discloses a clutch and brake linkage mechanism for a self-propelled tracked rotary tiller, including a rotary tiller body. The rotary tiller body includes a frame, a clutch mechanism, and a brake mechanism. The clutch mechanism includes a clutch pedal, a clutch connecting plate, a support rod, a clutch spring, and a clutch cable. The brake mechanism includes a brake pedal, a brake linkage, a brake spring, and a brake cable. The clutch connecting plate is characterized in that: the upper end of the clutch connecting plate is connected to the clutch pedal; the lower end of the clutch connecting plate has a front support plate extending forward and a lower support plate extending backward and downward; a support rod is laterally provided on one side of the front support plate; the front ends of the clutch spring and the clutch cable are connected to the support rod; the rear end of the clutch spring is connected to the frame; the upper part of the lower support plate is rotatably connected to the frame via a pivot, and the rear side of the lower support plate is arc-shaped. The aforementioned patent requires a brake pedal and a clutch pedal to control braking and clutch respectively. For the operator, both pedals are always prone to misoperation. Therefore, the prior art integrates the brake and pedal into one unit.

[0006] For example, Chinese patent document CN223187351U discloses an integrated brake and clutch pedal structure for agricultural machinery, including a support plate. The support plate is provided with a pedal, a brake pull plate, a clutch pull plate, a clutch cable, and a brake cable. The pedal is hinged to one end of the support plate via a connecting rod. A first waist hole is provided in the middle of the support plate. The middle part of the brake pull plate is rotatably connected to the upper middle part of the support plate. A second waist hole corresponding to the first waist hole is provided at the first end of the brake pull plate. One end of the clutch pull plate is hinged to the connecting rod, and the other end of the clutch pull plate is provided with a sliding pin. The sliding pin passes through the first and second waist holes and can slide along the first and second waist holes. A tension spring is provided at the other end of the support plate, and the other end of the tension spring is fixedly connected to the second end of the brake pull plate. One end of the clutch cable is fixedly connected to the sliding pin, and one end of the brake cable is connected to the first end of the brake pull plate. Combining the brake and clutch into one unit results in a complex overall structure with a large volume. Furthermore, the travel of the brake cable overlaps with that of the clutch cable, which can lead to fatigue of the clutch or brake cable over time, causing brake or clutch malfunctions. Summary of the Invention

[0007] To address the technical problems of fatigue and complex overall structure in brake and clutch mechanisms, this utility model provides a clutch and braking mechanism for agricultural machinery, including a pedal, a clutch cable, and a brake cable. The pedal is connected to the brake cable via a first linkage. The first linkage is characterized by having a roller, with a clutch arm cam above the roller. The clutch arm cam is connected to the clutch cable via a second linkage. During the first half of the pedal's travel, the first linkage pulls the brake cable from slack to taut, simultaneously causing the roller to rotate and tighten the clutch arm cam. During the second half of the pedal's travel, the first linkage continues to tighten the brake cable.

[0008] Preferably, in order to facilitate segmented control of the clutch cable and brake cable, the clutch arm cam has an arc-shaped structure, the bottom of the clutch arm cam contacts the roller, and the bottom of the clutch arm cam is provided with a clutch involute thread and a brake arc thread.

[0009] Preferably, to prevent the clutch cable from being stretched in the latter half of the pedal stroke, the clutch involute thread has a concave structure, with the deepest part of the concavity being the clutch start point, and the connection point between the clutch involute thread and the brake arc thread being the clutch completion point and the brake start point.

[0010] Preferably, in order to facilitate controlling the clutch cable first and then the brake cable, the linkage component one includes a pull rod, a linkage rod, and a fork. One end of the pull rod is connected to the pedal, and the other end is fixedly connected to the fork through the linkage rod. The fork is rotatably connected to the mounting post one.

[0011] Preferably, the two forked ends of the forked component are connected to a brake cable and a roller, respectively.

[0012] To prevent the roller from disengaging, the roller and the clutch arm cam are disposed in the strip groove at the fork end of the fork member, the roller is rotatably connected in the strip groove, and the clutch arm cam moves above the roller.

[0013] To facilitate the simultaneous release of the brake and clutch cables by the pedal, the second linkage is located below the first linkage, and the second linkage is rotatably connected to the second mounting post along with the clutch arm cam.

[0014] To facilitate parking, a handbrake mechanism is provided below the pedal. The handbrake mechanism includes a fixed rod and a handbrake lever. The handbrake lever is sleeved on the fixed rod, and the lower end of the handbrake lever is a barb that can hook onto the crossbar below the pedal.

[0015] To facilitate automatic release of the handbrake when the pedal is pressed, a torsion spring is fitted onto the fixing rod. One end of the torsion spring is fixedly installed, and the other end is hooked onto the handbrake lever.

[0016] This utility model has the following beneficial effects: 1. This utility model integrates the clutch and brake onto a single pedal. The first half of the pedal's travel controls the brake cable's transition from slack to taut and the clutch cable's transition from start to finish. The second half of the pedal's travel controls the brake cable's transition from start to finish, achieving the function of clutch engagement followed by braking, completely eliminating driver misoperation of the clutch and brake. The clutch and brake travels of this utility model do not overlap, preventing the clutch and brake cables from being pushed down by the pedal and exceeding their travel range, thus preventing fatigue. The clutch involute thread and brake arc thread at the bottom of the clutch arm cam are both centered on the rotation point of the first linkage component. The distance from the center of the clutch involute thread gradually increases from its starting point to its completion point; this changing travel is the clutch cable's travel. The distance from the center of the brake arc thread from its starting point to its completion point remains constant. Therefore, the first linkage component will not drive the clutch arm cam and the second linkage component to rotate during this travel, thus preventing an increase in the clutch cable's travel. However, the first linkage component will continue to increase the brake cable's travel, thereby achieving braking.

[0017] 2. This utility model integrates the brake, parking brake, and clutch into one unit. The overall structure is simple, with few parts and a small size. Only one pedal, two linkages, and a clutch arm cam are needed to control the clutch cable and brake cable, thus realizing the control of the clutch and brake. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of the clutch and braking mechanism of the agricultural machinery of this utility model; Figure 2 for Figure 1 A sectional view; Figure 3 for Figure 2 Enlarged schematic diagram; Figure 4 for Figure 1 Rear view; Figure 5 This is a schematic diagram of the clutch and braking mechanism of the agricultural machinery of this utility model, showing the clutch starting state. Figure 6 This is a schematic diagram of the clutch and braking mechanism of the agricultural machinery of this utility model, showing the clutch completed state and the braking start state. Detailed Implementation

[0019] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings of the instruction manual include: pedal 1, linkage component one 2, pull rod 201, linkage rod 202, fork component 203, fork end 204, strip groove 205, roller 3, clutch arm cam 4, linkage component two 5, clutch cable 6, brake cable 7, clutch involute thread 8, clutch starting point 801, clutch completion point 802, brake arc thread 9, brake starting point 901, mounting post one 10, mounting post two 11, fixing rod 12, handbrake lever 13, barb 14, crossbar 15, torsion spring 16.

[0020] Example 1 like Figure 1-6 As shown, a clutch and braking mechanism for agricultural machinery includes a pedal 1, a first linkage 2, a roller 3, a clutch arm cam 4, a second linkage 5, a clutch cable 6, and a brake cable 7. The pedal 1 is connected to the brake cable 7 and the roller 3 via the first linkage 2. The clutch arm cam 4 is positioned above the roller 3. The clutch arm cam 4 is connected to the clutch cable 6 via the second linkage 5. During the first half of the pedal stroke, the first linkage 2 pulls the brake cable 7 from slack to taut, while simultaneously driving the roller 3 to rotate the clutch arm cam 4 to tighten the clutch cable 6. During the second half of the pedal stroke, the first linkage 2 continuously tightens the brake cable 7.

[0021] The clutch arm cam 4 has an arc-shaped structure. The bottom of the clutch arm cam 4 contacts the roller 3. The bottom of the clutch arm cam 4 has a clutch involute thread 8 and a brake arc thread 9 from near to far.

[0022] The clutch gradually opening thread 8 has a concave structure, with the deepest part of the concavity being the clutch starting point 801. The connection point between the clutch gradually opening thread 8 and the brake arc thread 9 is the clutch completion point 802 and the brake starting point 901. The pedal 1 is fully depressed to be the brake completion point. The specific points can be adjusted according to the distance between the brake arc thread 9 and the pedal 1.

[0023] The linkage component 2 includes a pull rod 201, a linkage rod 202, and a fork 203. One end of the pull rod 201 is connected to the pedal 1, and the other end is fixedly connected to the fork 203 through the linkage rod 202. The fork 203 is rotatably connected to the mounting post 10.

[0024] The two forked ends 204 of the forked component 203 are respectively connected to the brake cable 7 and the roller 3. The brake cable 7 is connected to the forked end 204 through a movable component. The roller 3 and the clutch arm cam 4 are arranged in the strip groove 205 of the forked end 204. The roller 3 is rotatably connected in the strip groove 205, and the clutch arm cam 4 moves above the roller 3.

[0025] The second linkage component 5 is located below the first linkage component 2, and the second linkage component 5 and the clutch arm cam 4 are rotatably connected to the second mounting column 11.

[0026] A handbrake mechanism is provided below the pedal 1. The handbrake mechanism includes a fixed rod 12 and a handbrake lever 13. The handbrake lever 13 is sleeved on the fixed rod 12. The lower end of the handbrake lever 13 is a barb 14. The barb 14 can be hooked on the crossbar 15 below the pedal 1. The crossbar 15 connects the pedal 1 and the lever 201.

[0027] The fixing rod 12 is fitted with a torsion spring 16. One end of the torsion spring 16 is fixedly set, and the other end is hooked on the handbrake lever 13. When the pedal 1 is pressed, the handbrake is automatically released.

[0028] 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 and braking mechanism for agricultural machinery, comprising a pedal, a clutch cable, and a brake cable, wherein the pedal is connected to the brake cable via a linkage, characterized in that, The first linkage is also equipped with a roller, and a clutch arm cam is provided above the roller. The clutch arm cam is connected to the clutch cable through the second linkage. When the pedal travels in the first half of its stroke, it drives the first linkage to pull the brake cable from loose to tight, and at the same time drives the roller to rotate the clutch arm cam to tighten the clutch cable. When the pedal travels in the second half of its stroke, it continues to drive the first linkage to tighten the brake cable.

2. The clutch and braking mechanism of agricultural machinery according to claim 1, characterized in that: The clutch arm cam has an arc-shaped structure, and the bottom of the clutch arm cam contacts the roller. The bottom of the clutch arm cam is provided with a clutch involute thread and a brake arc thread.

3. The clutch and braking mechanism of agricultural machinery according to claim 2, characterized in that: The clutch gradually disengaging thread has a concave structure, with the deepest part of the concavity being the clutch starting point. The connection point between the clutch gradually disengaging thread and the brake arc thread is the clutch completion point and the brake starting point.

4. The clutch and braking mechanism of agricultural machinery according to claim 3, characterized in that: The linkage component includes a pull rod, a linkage rod, and a fork. One end of the pull rod is connected to the pedal, and the other end is fixedly connected to the fork via the linkage rod. The fork is rotatably connected to the mounting post.

5. The clutch and braking mechanism of agricultural machinery according to claim 4, characterized in that: The two forked ends of the forked component are respectively connected to the brake cable and the roller.

6. The clutch and braking mechanism of agricultural machinery according to claim 5, characterized in that: The roller and clutch arm cam are disposed in the strip groove at the fork end of the fork member, the roller is rotatably connected in the strip groove, and the clutch arm cam moves above the roller.

7. The clutch and braking mechanism of agricultural machinery according to any one of claims 1-6, characterized in that: The second linkage component is located below the first linkage component, and the second linkage component and the clutch arm cam are rotatably connected to the second mounting column.

8. The clutch and braking mechanism of agricultural machinery according to claim 7, characterized in that: A handbrake mechanism is provided below the pedal. The handbrake mechanism includes a fixed rod and a handbrake lever. The handbrake lever is sleeved on the fixed rod. The lower end of the handbrake lever is a barb that can hook onto the crossbar below the pedal.

9. The clutch and braking mechanism of agricultural machinery according to claim 8, characterized in that: The fixing rod is fitted with a torsion spring, one end of which is fixedly installed and the other end is hooked onto the handbrake lever.

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