Four-bar linkage axle end wrapped against sand

Abstract

The application discloses a four-connecting-rod axle end wrapping silt-preventing electric pedal, which comprises two symmetrically distributed vehicle beam mounting racks, the inside of each vehicle beam mounting rack is provided with two symmetrically distributed driving shafts, a wrapping silt-preventing mechanism is arranged on the vehicle beam mounting rack, the wrapping silt-preventing mechanism comprises a silt-preventing cover and an air inlet pipe, the two ends of each driving shaft are provided with silt-preventing covers, and the silt-preventing covers are wrapped outside the bearing connecting positions of the driving shafts and the vehicle beam mounting racks. Compressed gas is actively injected into the inside of the silt-preventing cover wrapped outside the bearing connecting position of the driving shaft and the vehicle beam mounting rack, the internal air pressure of the silt-preventing cover is greater than the sealing maintenance pressure of the sealing ring, the high-pressure gas continuously seeps out outward along the matching gap between the silt-preventing cover and the sealing ring, a dynamic annular air curtain with a direction completely opposite to the sand dust invasion path is formed outside the axle end interface, and the channel for the sand dust to migrate to the inside of the bearing is physically blocked.

Description

Technical Field

[0001] This invention belongs to the field of electric pedal technology, specifically an electric pedal with a four-link shaft end wrapped to prevent mud and sand. Background Technology

[0002] Currently, with the continuous development of the automotive industry and the increasing demand for multi-functional vehicles, electric pedals, as a convenient auxiliary device for getting in and out of vehicles, have been widely used in off-road vehicles, SUVs, and commercial vehicles. Electric pedals are usually installed on the side beams of the vehicle and are connected to the drive motor through a four-bar linkage. The motor drives the four-bar linkage to swing, thereby realizing the unfolding and retraction of the pedal. In existing electric pedals, the core actuator is typically a four-bar linkage. This structure generally includes a mounting bracket fixed to the vehicle frame, a drive shaft driven by a motor, a drive plate that oscillates with the drive shaft, a driven plate linked to the drive plate via a telescopic frame, and a foot pedal fixedly connected to the telescopic frame. When the motor drives the drive shaft to rotate, the drive plate causes the telescopic frame and driven plate to move synchronously, thereby controlling the positional changes of the foot pedal in the horizontal and vertical directions. This structure is relatively mature and can reliably achieve the pedal's retraction and extension functions. However, in the four-bar linkage of electric pedals, the drive shaft and the vehicle frame mounting bracket are typically connected by a bearing, leaving an exposed shaft interface. In actual use, especially in harsh environments such as deserts, muddy areas, and dusty conditions, sand, mud, and other impurities kicked up by the vehicle wheels easily adhere to the interface between the shaft and the mounting bracket. With frequent pedal extension and retraction, sand gradually seeps in through the tiny gaps between the shaft and the bearing, mixing with the lubricating grease to form an abrasive paste. This increases the rotational resistance of the shaft, hinders mechanical movement, and can even cause electrical malfunctions due to motor stalling. For example, some models have exhibited this problem during desert road tests, where the interface between the motor shaft and the vehicle frame was covered in sand, causing mechanical movement to be hindered and accompanied by continuous friction noise when the pedal was extended or retracted. Therefore, it is necessary to design an electric pedal with a four-bar shaft end wrapped to prevent sand and mud buildup. Summary of the Invention

[0003] The purpose of this invention is to provide an electric pedal with a four-link shaft end wrapped to prevent mud and sand from entering, thereby solving the problems mentioned in the background art.

[0004] To address the aforementioned problems, this invention provides a technical solution for an electric pedal with a four-link shaft end wrapped to prevent mud and sand accumulation: An electric pedal with a four-link shaft end wrapped to prevent mud and sand includes two symmetrically distributed beam mounting frames. Each beam mounting frame has two symmetrically distributed drive shafts inside. The beam mounting frame is equipped with a sand-proof wrapping mechanism, which includes a sand-proof cover and an air intake pipe. Each drive shaft has a sand-proof cover at both ends. The sand-proof cover wraps around the bearing connection between the drive shaft and the beam mounting frame. An air intake pipe is fixedly installed at the upper end of the sand-proof cover. A one-way pressurization component is installed inside the air intake pipe. A pneumatic cleaning mechanism is provided on the outer side of the vehicle beam mounting frame. The pneumatic cleaning mechanism includes a pressurized air chamber box and a pressurized air chamber frame. The pressurized air chamber box is fixedly installed on the back of the vertical mounting plate of the vehicle beam mounting frame. The pressurized air chamber frame is fixedly installed inside the pressurized air chamber box. A one-way air intake filter assembly is provided on the pressurized air chamber box.

[0005] Preferably, the sand-proof wrapping mechanism further includes fixing rings. Multiple evenly distributed fixing rings are fixedly installed on the outer side of each of the vehicle beam mounting brackets. A sealing ring is sleeved on the outer side of the fixing ring. The sand-proof cover is pressed against the outer side of the sealing ring. The sealing ring has an L-shaped cross-section. The sand-proof cover can wrap and protect the shaft end. The sealing ring and the sand-proof cover are in elastic contact. The sealing pressure is determined by the compression of the sealing ring and the elasticity of the material. When the air pressure inside the sand-proof cover exceeds the elastic contact pressure, controllable air leakage occurs. During air leakage, the sand and dust accumulated inside the gaps can be blown away.

[0006] Preferably, two symmetrically distributed mounting ears are fixedly installed on the outer side of the sand cover. The mounting ears are bolted to the outer side of the vehicle beam mounting frame. The mounting ears are in contact with the sealing ring. The mounting ears can install the sand cover and facilitate subsequent maintenance.

[0007] Preferably, the unidirectional pressurization assembly includes a central mounting plate. The central mounting plate is fixedly installed on the lower part of the inner wall of the air intake pipe. A reset pin is slidably connected inside the central mounting plate. A baffle is fixedly installed at the lower end of the reset pin. A sealing plug is fixedly installed at the upper end of the baffle. The sealing plug is fixedly connected to the rod of the reset pin. The sealing plug is slidably connected to the lower end of the air intake pipe. The baffle contacts the lower end of the air intake pipe. A pressure-boosting spring is provided on the outside of the reset pin. One end of the pressure-boosting spring is fixedly connected to the pin head of the reset pin. The other end of the pressure-boosting spring is fixedly connected to the central mounting plate. When the pressure inside the air intake pipe is greater than the elastic force of the pressure-boosting spring, the air pressure can push the sealing plug and the baffle to move. When the sealing plug is disengaged from the air intake pipe, the inside of the sandproof cover can be inflated.

[0008] Preferably, the pneumatic cleaning mechanism further includes an exhaust check valve. Two symmetrically distributed exhaust check valves are fixedly installed on the upper outer side of the pressurized air chamber frame. The exhaust check valves are located inside the pressurized air chamber box. A piston plate is slidably connected inside the pressurized air chamber frame. Two symmetrically distributed slide rods are fixedly installed at the lower end of the piston plate. A wheel plate is fixedly installed at the lower end of the two slide rods. Two symmetrically distributed drive wheels are installed on the outer side of the wheel plate through bearings. During the retraction process, the drive plate can move the wheel plate through the drive wheels. During the movement, the wheel plate drives the piston plate to slide inside the pressurized air chamber frame through the slide rods, and pressurizes the inside of the pressurized air chamber box through the exhaust check valves.

[0009] Preferably, the slide rod is slidably connected to the pressurized air chamber box, and a return spring is provided on the outer side of each slide rod. One end of the return spring is fixedly connected to the lower end of the pressurized air chamber box, and the other end of the return spring is fixedly connected to the wheel plate. An elastic corrugated sleeve is provided on the outer side of the return spring, and the two ends of the elastic corrugated sleeve are fixedly connected to the pressurized air chamber box and the wheel plate respectively. The elastic corrugated sleeve can prevent the return spring from being jammed by foreign objects.

[0010] Preferably, two symmetrically distributed high-pressure air supply pipes are fixedly installed on the outer side of the pressurized air chamber box. The high-pressure air supply pipes are fixedly connected to the air inlet pipe. Pipe clamps are fixedly installed on the outer side of the high-pressure air supply pipes. The pipe clamps are fixedly connected to the vehicle beam mounting frame. The pipe clamps can support the high-pressure air supply pipes and prevent them from being damaged by vibration.

[0011] Preferably, the one-way air intake filter assembly includes an air intake sleeve. The air intake sleeve is fixedly installed inside the upper end of the pressurized air chamber box. The air intake sleeve passes through the pressurized air chamber frame and is fixedly connected to the pressurized air chamber frame. Multiple evenly distributed one-way air intake valves are fixedly installed inside the air intake sleeve. A support frame is fixedly installed in the upper middle part of the inner wall of the air intake sleeve. A filter sponge is slidably connected to the upper part of the inner wall of the air intake sleeve. A pressure frame is snapped onto the outer side of the air intake sleeve. The lower end face of the filter sponge contacts the support frame, and the upper end face of the filter sponge contacts the opening of the pressure frame. The filter sponge can filter the gas entering the interior of the pressurized air chamber frame.

[0012] Preferably, a foot pedal is provided on the outer side of the beam mounting frame. A passive plate is fixedly installed on the outer side of the drive shaft near the foot pedal, and an drive plate is fixedly installed on the outer side of the other drive shaft. The ends of the drive plate and the passive plate away from the beam mounting frame are hinged to a telescopic frame. The foot pedal is fixedly installed on the upper end of the telescopic frame. The drive plate and the passive plate are simultaneously hinged to the telescopic frame and the beam mounting frame to form a four-bar linkage structure. The telescopic frame can be moved by the deflection of the drive plate, and the passive plate can guide the movement trajectory of the telescopic frame.

[0013] Preferably, a drive motor is fixedly mounted on the outer side of one of the vehicle beam mounting brackets. The output shaft of the drive motor is fixedly connected to its corresponding drive shaft. The drive motor can drive the drive shaft to rotate through the internal worm gear structure.

[0014] The beneficial effects of this invention are: This invention actively injects compressed gas into the sand cover surrounding the connection between the drive shaft and the bearing of the vehicle beam mounting frame. This causes the internal air pressure of the sand cover to exceed the sealing pressure of the sealing ring, forcing the high-pressure gas to continuously seep outward along the gap between the sand cover and the sealing ring. This forms a dynamic annular air curtain around the shaft end interface, with the direction completely opposite to the sand intrusion path, thus physically blocking the channel for sand to migrate into the bearing. Simultaneously, during this outward exhaust process, the airflow forcibly blows away the sand accumulated on the lip of the sealing ring and the edge of the gap. Each pedal movement is accompanied by a complete inflation and deflation cycle, achieving high-frequency periodic automatic cleaning of the shaft end gap. This effectively prevents sand from mixing with lubricating grease to form abrasive paste, fundamentally solving the problem of passive protection failure caused by the wear and aging of seals. This significantly improves the sealing reliability and long service life of electric pedals in harsh environments with high dust levels, such as deserts and Gobi.

[0015] This invention converts the oscillating mechanical energy of the active plate in a four-bar linkage into compression work on the air within the pressurized air chamber via the drive wheel, wheel plate, slide rod, and piston plate. The resulting compressed air is stored in the pressurized air chamber box via an exhaust one-way valve and guided to the sand cover at each axle end through a one-way pressurization component in the high-pressure air supply pipe and intake pipe. This achieves a fully mechanical linkage where the air source is generated entirely by the pedal's own retraction and extension action, eliminating the need for any independent air pump motor or electromagnetic control valve. Furthermore, by placing a filter sponge at the air inlet of the pressurized air chamber box and configuring a one-way pressurization component in the intake pipe, the invention ensures that the air entering the pneumatic system is clean and dust-free. When the piston plate retracts and resets, the pressurization spring pushes the sealing plug to instantly cut off the connection between the intake pipe and the sand cover, completely eliminating the risk of secondary pollution caused by the system's negative pressure drawing external sand and dust back into the sand cover. This significantly reduces the vehicle's power consumption and manufacturing costs, while also avoiding potential electrical component failures in harsh chassis environments, thus improving the overall system's vibration resistance, durability, and environmental adaptability.

[0016] This invention integrates the pressurized air chamber into the back of the vertical mounting plate of the vehicle beam mounting bracket. The high-pressure air supply pipe is reliably fixed to the vehicle beam mounting bracket via pipe clamps. The sand cover is bolted to the outside of the vehicle beam mounting bracket via fixed mounting ear plates, forming a modular and easily disassembled overall layout. This not only makes full use of the idle space between the mounting bracket and the vehicle body, but also avoids adding extra dimensions to the electric pedal in the width and height directions of the vehicle. It has strong adaptability and is easy to upgrade and install on existing vehicle platforms. Moreover, each drive shaft has an independent sand cover and air intake pipe at both ends, and is supplied with air in parallel through high-pressure air supply pipes, achieving full coverage and no dead angle air curtain protection for all shaft interfaces in the four-bar linkage mechanism. In addition, the effective isolation and protection of the return spring by the elastic corrugated sleeve and the L-shaped cross-section extrusion fit design of the sealing ring further reduce the risk of corrosion and jamming of the pneumatic actuator in outdoor mud and sand environments. This makes the entire sand protection system compact in structure, easy to maintain, and has extremely high life cycle reliability and wide vehicle compatibility. Attached Figure Description

[0017] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 The overall three-dimensional structure of the present invention Figure 1 ; Figure 2 The overall three-dimensional structure of the present invention Figure 2 ; Figure 3 For the present invention Figure 1 Local structural three-dimensional Figure 1 ; Figure 4 For the present invention Figure 1 Local structural three-dimensional Figure 2 ; Figure 5 For the present invention Figure 1 A 3D view of the vehicle beam mounting bracket; Figure 6 For the present invention Figure 1 Local structural cross-section Figure 1 ; Figure 7 For the present invention Figure 1 Local structural cross-section Figure 2 ; Figure 8 For the present invention Figure 6 A three-dimensional view of the piston plate; Figure 9 For the present invention Figure 4 A 3D view of the sand-proof cover; Figure 10 For the present invention Figure 6 Enlarged view of the A-section structure; Figure 11 For the present invention Figure 7 Enlarged view of the structure of section B; Figure 12 For the present invention Figure 11 A three-dimensional view of the sealing plug.

[0019] In the diagram: 1. Chassis mounting bracket; 2. Drive shaft; 3. Sandproof wrapping mechanism; 4. One-way supercharging assembly; 5. Pneumatic cleaning mechanism; 6. One-way air intake filter assembly; 7. Active plate; 8. Passive plate; 9. Telescopic frame; 10. Foot pedal; 11. Drive motor; 31. Sandproof cover; 32. Retaining ring; 33. Sealing ring; 34. Air intake pipe; 35. Fixed mounting ear plate; 41. Center mounting plate; 42. Reset pin; 4 3. Sealing plug; 44. Baffle plate; 45. Pressure boosting spring; 51. Pressure boosting chamber box; 52. Pressurized chamber frame; 53. Exhaust check valve; 54. Piston plate; 55. Slide rod; 56. Wheel plate; 57. Drive wheel; 58. Return spring; 59. High-pressure gas pipe; 50. Pipe clamp; 501. Elastic corrugated sleeve; 61. Inlet sleeve; 62. Inlet check valve; 63. Support frame; 64. Filter sponge; 65. Lower pressure frame. Detailed Implementation

[0020] like Figure 1-12 As shown, the specific implementation adopts the following technical solution: Example

[0021] An electric pedal with a four-link shaft end-wrapped anti-mud and sand protection mechanism includes two symmetrically distributed vehicle beam mounting frames 1. Each vehicle beam mounting frame 1 has two symmetrically distributed drive shafts 2 inside. The vehicle beam mounting frame 1 is equipped with an anti-mud and sand protection mechanism 3, which includes an anti-mud cover 31 and an air intake pipe 34. Each drive shaft 2 has an anti-mud cover 31 at both ends. The anti-mud cover 31 wraps around the bearing connection between the drive shaft 2 and the vehicle beam mounting frame 1. The upper end of the anti-mud cover 31 is fixedly installed with an air intake pipe 34. The air intake pipe 34 is equipped with a one-way pressurization component 4 inside. The outside of the vehicle beam mounting frame 1 is equipped with a pneumatic cleaning mechanism 5. The pneumatic cleaning mechanism 5 includes a pressurization chamber box 51 and a pressurization chamber frame 52. The pressurization chamber box 51 is fixedly installed on the back of the vertical mounting plate of the vehicle beam mounting frame 1. The pressurization chamber box 51 is fixedly installed with a pressurization chamber frame 52 inside. The pressurization chamber box 51 is equipped with a one-way air intake filter component 6.

[0022] The sand-proof mechanism 3 also includes a fixing ring 32. Multiple evenly distributed fixing rings 32 are fixedly installed on the outside of each beam mounting frame 1. A sealing ring 33 is sleeved on the outside of the fixing ring 32. The sand-proof cover 31 is pressed against the outside of the sealing ring 33. The sealing ring 33 has an L-shaped cross-section. The sand-proof cover 31 can wrap and protect the shaft end. The sealing ring 33 and the sand-proof cover 31 are in elastic contact. The sealing pressure is determined by the compression of the sealing ring 33 and the elasticity of the material. When the air pressure inside the sand-proof cover 31 exceeds the elastic contact pressure, controllable air leakage occurs. When air is released, the sand accumulated inside the gap can be blown away. Two symmetrically distributed fixed mounting ears 35 are fixedly installed on the outside of the sand-proof cover 31. The fixed mounting ears 35 are installed on the outside of the beam mounting frame 1 by bolts. The fixed mounting ears 35 are in contact with the sealing ring 33. The fixed mounting ears 35 can install the sand-proof cover 31, which is convenient for later maintenance.

[0023] The unidirectional pressurization assembly 4 includes a central mounting plate 41. The central mounting plate 41 is fixedly installed on the lower part of the inner wall of the air intake pipe 34. A reset pin 42 is slidably connected inside the central mounting plate 41. A baffle 44 is fixedly installed at the lower end of the reset pin 42. A sealing plug 43 is fixedly installed at the upper end of the baffle 44. The sealing plug 43 is fixedly connected to the rod of the reset pin 42. The sealing plug 43 is slidably connected to the lower end of the air intake pipe 34. The baffle 44 contacts the lower end of the air intake pipe 34. A pressurization spring 45 is provided on the outside of the reset pin 42. One end of the pressurization spring 45 is fixedly connected to the pin cap of the reset pin 42. The other end of the pressurization spring 45 is fixedly connected to the central mounting plate 41. When the pressure inside the air intake pipe 34 is greater than the elastic force of the pressurization spring 45, the air pressure can push the sealing plug 43 and the baffle 44 to move. When the sealing plug 43 is disengaged from the air intake pipe 34, the inside of the sand cover 31 can be inflated.

[0024] The pneumatic cleaning mechanism 5 also includes an exhaust check valve 53. Two symmetrically distributed exhaust check valves 53 are fixedly installed on the upper outer side of the pressurized air chamber frame 52. The exhaust check valves 53 are located inside the pressurized air chamber box 51. A piston plate 54 is slidably connected inside the pressurized air chamber frame 52. Two symmetrically distributed slide rods 55 are fixedly installed at the lower end of the piston plate 54. A wheel plate 56 is fixedly installed at the lower end of the two slide rods 55. Two symmetrically distributed drive wheels 57 are installed on the outer side of the wheel plate 56 through bearings. During the recycling process, the drive plate 7 can drive the wheel plate 56 to move through the drive wheels 57. During the movement, the wheel plate 56 drives the piston plate 54 to slide inside the pressurized air chamber frame 52 through the slide rods 55, and pressurizes the inside of the pressurized air chamber box 51 through the exhaust check valves 53.

[0025] The slide rod 55 is slidably connected to the pressurized air chamber box 51. Each slide rod 55 is provided with a return spring 58 on its outer side. One end of the return spring 58 is fixedly connected to the lower end of the pressurized air chamber box 51, and the other end of the return spring 58 is fixedly connected to the wheel plate 56. An elastic corrugated sleeve 501 is provided on the outer side of the return spring 58. The two ends of the elastic corrugated sleeve 501 are fixedly connected to the pressurized air chamber box 51 and the wheel plate 56 respectively. The elastic corrugated sleeve 501 can prevent the return spring 58 from being jammed by foreign objects. Two symmetrically distributed high-pressure air supply pipes 59 are fixedly installed on the outer side of the pressurized air chamber box 51. The high-pressure air supply pipes 59 are fixedly connected to the air intake pipe 34. A pipe clamp 50 is fixedly installed on the outer side of the high-pressure air supply pipes 59. The pipe clamp 50 is fixedly connected to the vehicle beam mounting frame 1. The pipe clamp 50 can support the high-pressure air supply pipes 59 and prevent the high-pressure air supply pipes 59 from being damaged by vibration.

[0026] The one-way air intake filter assembly 6 includes an air intake sleeve 61. The air intake sleeve 61 is fixedly installed inside the upper end of the pressurized air chamber box 51. The air intake sleeve 61 passes through the pressurized air chamber frame 52 and is fixedly connected to the pressurized air chamber frame 52. Multiple evenly distributed one-way air intake valves 62 are fixedly installed inside the air intake sleeve 61. A support frame 63 is fixedly installed in the upper middle part of the inner wall of the air intake sleeve 61. A filter sponge 64 is slidably connected to the upper part of the inner wall of the air intake sleeve 61. A pressure frame 65 is snapped onto the outer side of the air intake sleeve 61. The lower end face of the filter sponge 64 contacts the support frame 63, and the upper end face of the filter sponge 64 contacts the opening of the pressure frame 65. The filter sponge 64 can filter the gas entering the interior of the pressurized air chamber frame 52.

[0027] The vehicle beam mounting frame 1 has a foot pedal 10 on its outer side. A passive plate 8 is fixedly installed on the outer side of the drive shaft 2 near the foot pedal 10. Another drive shaft 2 has a drive plate 7 fixedly installed on its outer side. The ends of the drive plate 7 and the passive plate 8 away from the vehicle beam mounting frame 1 are hinged to a telescopic frame 9. The foot pedal 10 is fixedly installed on the upper end of the telescopic frame 9. The drive plate 7 and the passive plate 8 are simultaneously hinged to the telescopic frame 9 and the vehicle beam mounting frame 1 to form a four-bar linkage. The telescopic frame 9 can be moved by the deflection of the drive plate 7. At the same time, the passive plate 8 can guide the movement trajectory of the telescopic frame 9. A drive motor 11 is fixedly installed on the outer side of one of the vehicle beam mounting frames 1. The output shaft of the drive motor 11 is fixedly connected to its corresponding drive shaft 2. The drive motor 11 can drive the drive shaft 2 to rotate through the internal worm gear structure.

[0028] The invention is used as follows: During operation, the drive motor 11 drives the drive shaft 2 to rotate through a worm gear structure. The drive shaft 2 drives the drive plate 7, which is fixedly installed on its outer side, to swing synchronously. The drive plate 7 drives the passive plate 8 to move along a predetermined trajectory through the telescopic frame 9. The upper end of the telescopic frame 9 is fixedly installed with a foot pedal 10. The drive plate 7, the passive plate 8, the telescopic frame 9, and the vehicle beam mounting frame 1 together form a four-bar linkage mechanism, thereby controlling the foot pedal 10 to achieve a smooth unfolding or retraction action in the lateral direction of the vehicle. During the above-mentioned pedal unfolding and retraction process, the swinging motion of the drive plate 7 simultaneously provides driving force for the pneumatic cleaning mechanism 5, realizing the mechanical linkage integration of the sand-proof function and the basic movement function of the pedal. When the drive motor 11 drives the drive shaft 2 to rotate, causing the foot pedal 10 to retract, the drive plate 7 swings synchronously with the drive shaft 2. The swing end of the drive plate 7 pushes the drive wheel 57 that is in contact with it. The drive wheel 57 is mounted on the outside of the wheel plate 56 through a bearing. The wheel plate 56 moves upward under the push of the drive wheel 57. The wheel plate 56 drives two symmetrically distributed slide rods 55 to slide upward synchronously. The slide rods 55 further push the piston plate 54 inside the pressurized air chamber frame 52 to move upward. The piston plate 54 compresses the air inside the pressurized air chamber frame 52. The high-pressure gas generated by compression is discharged through the exhaust one-way valve 53 fixedly installed on the upper part of the outer side of the pressurized air chamber frame 52 and stored inside the pressurized air chamber box 51 to form a stable air pressure source. During this process, the return spring 58 located on the outside of the slide bar 55 is stretched and stored energy. The elastic corrugated sleeve 501 extends and contracts synchronously with the return spring 58 to isolate and protect the return spring 58, preventing mud and foreign objects from jamming the spring. When the foot pedal 10 performs the unfolding action, the active plate 7 swings in the opposite direction, releasing the thrust on the drive wheel 57. The return spring 58 releases its elastic potential energy, pulling the wheel plate 56 and the slide rod 55 downward to reset. The slide rod 55 drives the piston plate 54 to slide downward inside the pressurized air chamber frame 52, creating a negative pressure inside the pressurized air chamber frame 52. At this time, external air is drawn in through the air intake sleeve 61, which is fixedly installed inside the upper end of the pressurized air chamber box 51. The air intake sleeve 61 passes through the pressurized air chamber frame 52 and is fixedly connected to it. The air passes through the opening of the lower pressure frame 65, the filter sponge 64 and the support frame 63 in sequence before entering the interior of the pressurized air chamber frame 52. The filter sponge 64 efficiently filters and purifies the sand and dust and moisture in the air intake. Multiple evenly distributed one-way valves 62 fixedly installed inside the air intake sleeve 61 open when intake and close when compression to ensure that the airflow direction is single and controllable, providing a clean air source for the next compression stroke. Compressed air stored in the booster chamber 51 is output through two symmetrically distributed high-pressure air supply pipes 59 fixedly installed on the outside of the booster chamber 51. The high-pressure air supply pipes 59 are fixedly installed on the vehicle beam mounting bracket 1 by pipe clamps 50. Compressed air is transported along the high-pressure air supply pipes 59 to the air inlet pipes 34 fixedly installed on the upper end of each sand cover 31. A center mounting plate 41 is fixedly installed on the lower middle part of the inner wall of the air inlet pipe 34. A reset pin 42 is slidably connected inside the center mounting plate 41. A baffle 44 is fixedly installed at the lower end of the reset pin 42. A sealing plug 43 is fixedly installed at the upper end of 44. The sealing plug 43 is fixedly connected to the rod of the reset nail 42. A pressure spring 45 is provided on the outside of the reset nail 42. One end of the pressure spring 45 is fixedly connected to the nail head of the reset nail 42, and the other end is fixedly connected to the central mounting plate 41. When the air pressure in the air intake pipe 34 does not reach the preset threshold, the sealing plug 43 is sealed at the lower end of the air intake pipe 34 under the elastic force of the pressure spring 45. The baffle 44 contacts and seals the lower end of the air intake pipe 34, and the gas cannot enter the interior of the sand cover 31. When the air pressure in the intake pipe 34 continues to rise and exceeds the elastic force of the booster spring 45, the air pressure pushes the baffle 44 and the sealing plug 43 to move downward. The sealing plug 43 slides downward along the lower end of the intake pipe 34 and disengages from the pipe opening of the intake pipe 34. Compressed air enters the inner cavity of the sand cover 31 through the lower end of the intake pipe 34, and inflates and pressurizes the inside of the sand cover 31. The sand cover 31 wraps around the bearing connection between the drive shaft 2 and the beam mounting frame 1. Multiple evenly distributed fixing rings 32 are fixedly installed on the outer side of the beam mounting frame 1. An L-shaped sealing ring 33 is sleeved on the outer side of each fixing ring 32. The sand cover 31 presses against the outer side of the sealing ring 33. Two symmetrically distributed fixing lugs 35 are fixedly installed on the outer side of the sand cover 31 and bolted to the outer side of the beam mounting frame 1. The fixing lugs 35 contact the sealing ring 33 and limit its movement. When compressed air continuously enters the inner cavity of the sand cover 31, causing the internal air pressure to exceed the sealing pressure of the sealing ring 33, the high-pressure gas flows along the sand cover 31 and the sealing ring 33... The gap between the three parts leaks outward, forming a 360° annular dynamic air curtain around the shaft end interface of the drive shaft 2. The airflow direction of this air curtain is opposite to the direction of sand and dust intrusion, blowing away sand and dust particles that try to approach the gap. At the same time, it forcibly blows away the sand and dust that has accumulated on the lip of the sealing ring 33 and the edge of the gap. When the air pressure in the intake pipe 34 drops below the elastic force of the pressure spring 45, the pressure spring 45 pushes the reset pin 42 to reset upward. The sealing plug 43 re-seals the lower end of the intake pipe 34, cutting off the connection between the intake pipe 34 and the sand cover 31, preventing the backflow of gas inside the sand cover 31 and preventing external sand and dust from being sucked back into the sand cover 31 due to negative pressure during the intake stroke.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. An electric pedal with a four-link shaft end wrapped to prevent mud and sand accumulation, characterized in that: It includes two symmetrically distributed beam mounting frames (1), each beam mounting frame (1) is provided with two symmetrically distributed drive shafts (2), the beam mounting frame (1) is provided with a sand-proof wrapping mechanism (3), the sand-proof wrapping mechanism (3) includes a sand-proof cover (31) and an air intake pipe (34), each drive shaft (2) is provided with a sand-proof cover (31) at both ends, the sand-proof cover (31) wraps around the outside of the bearing connection between the drive shaft (2) and the beam mounting frame (1), the upper end of the sand-proof cover (31) is fixedly installed with an air intake pipe (34), the air intake pipe (34) is provided with a one-way pressurization component (4) inside; A pneumatic cleaning mechanism (5) is provided on the outside of the vehicle beam mounting frame (1). The pneumatic cleaning mechanism (5) includes a pressurized air chamber box (51) and a pressurized air chamber frame (52). The pressurized air chamber box (51) is fixedly installed on the back of the vertical mounting plate of the vehicle beam mounting frame (1). The pressurized air chamber frame (52) is fixedly installed inside the pressurized air chamber box (51). A one-way air intake filter assembly (6) is provided on the pressurized air chamber box (51).

2. The electric pedal with a four-link shaft end wrapped to prevent mud and sand from entering, as described in claim 1, is characterized in that: The sand-proof wrapping mechanism (3) also includes a fixing ring (32). Multiple evenly distributed fixing rings (32) are fixedly installed on the outside of each of the vehicle beam mounting frames (1). A sealing ring (33) is sleeved on the outside of the fixing ring (32). The sand-proof cover (31) is pressed against the outside of the sealing ring (33). The sealing ring (33) has an L-shaped cross-section.

3. The electric pedal with a four-link shaft end wrapped to prevent mud and sand from entering, as described in claim 2, is characterized in that: Two symmetrically distributed mounting ears (35) are fixedly installed on the outer side of the sand cover (31). The mounting ears (35) are installed on the outer side of the vehicle beam mounting frame (1) by bolts. The mounting ears (35) are in contact with the sealing ring (33).

4. The electric pedal with a four-link shaft end wrapped to prevent mud and sand accumulation as described in claim 1, characterized in that: The one-way booster assembly (4) includes a center mounting plate (41). The center mounting plate (41) is fixedly installed on the lower part of the inner wall of the intake pipe (34). A reset pin (42) is slidably connected inside the center mounting plate (41). A baffle (44) is fixedly installed at the lower end of the reset pin (42). A sealing plug (43) is fixedly installed at the upper end of the baffle (44). The sealing plug (43) is fixedly connected to the rod of the reset pin (42). The sealing plug (43) is slidably connected to the lower end of the intake pipe (34). The baffle (44) is in contact with the lower end of the intake pipe (34). A booster spring (45) is provided on the outside of the reset pin (42). One end of the booster spring (45) is fixedly connected to the nail head of the reset pin (42). The other end of the booster spring (45) is fixedly connected to the center mounting plate (41).

5. An electric pedal with a four-link shaft end wrapped to prevent mud and sand from entering, as described in claim 1, characterized in that: The pneumatic cleaning mechanism (5) also includes an exhaust check valve (53). Two symmetrically distributed exhaust check valves (53) are fixedly installed on the upper outer side of the pressurized air chamber frame (52). The exhaust check valves (53) are located inside the pressurized air chamber box (51). A piston plate (54) is slidably connected inside the pressurized air chamber frame (52). Two symmetrically distributed slide rods (55) are fixedly installed at the lower end of the piston plate (54). A wheel plate (56) is fixedly installed at the lower end of the two slide rods (55). Two symmetrically distributed drive wheels (57) are installed on the outer side of the wheel plate (56) through bearings.

6. An electric pedal with a four-link shaft end wrapped to prevent mud and sand from entering, as described in claim 5, characterized in that: The slide rod (55) is slidably connected to the pressurized air chamber box (51). Each slide rod (55) is provided with a return spring (58) on its outer side. One end of the return spring (58) is fixedly connected to the lower end of the pressurized air chamber box (51), and the other end of the return spring (58) is fixedly connected to the wheel plate (56). An elastic corrugated sleeve (501) is provided on the outer side of the return spring (58). The two ends of the elastic corrugated sleeve (501) are fixedly connected to the pressurized air chamber box (51) and the wheel plate (56) respectively.

7. An electric pedal with a four-link shaft end wrapped to prevent mud and sand from entering, as described in claim 5, characterized in that: Two symmetrically distributed high-pressure air supply pipes (59) are fixedly installed on the outside of the pressurized air chamber box (51). The high-pressure air supply pipes (59) are fixedly connected to the air inlet pipe (34). A pipe clamp (50) is fixedly installed on the outside of the high-pressure air supply pipes (59). The pipe clamp (50) is fixedly connected to the vehicle beam mounting frame (1).

8. An electric pedal with a four-link shaft end wrapped to prevent mud and sand from entering, as described in claim 1, characterized in that: The one-way air intake filter assembly (6) includes an air intake sleeve (61). The air intake sleeve (61) is fixedly installed inside the upper end of the pressurized air chamber box (51). The air intake sleeve (61) passes through the pressurized air chamber frame (52) and is fixedly connected to the pressurized air chamber frame (52). Multiple evenly distributed one-way air intake valves (62) are fixedly installed inside the air intake sleeve (61). A support frame (63) is fixedly installed in the upper middle part of the inner wall of the air intake sleeve (61). A filter sponge (64) is slidably connected to the upper part of the inner wall of the air intake sleeve (61). A pressure frame (65) is snapped onto the outer side of the air intake sleeve (61). The lower end face of the filter sponge (64) contacts the support frame (63), and the upper end face of the filter sponge (64) contacts the opening of the pressure frame (65).

9. An electric pedal with a four-link shaft end wrapped to prevent mud and sand from entering, as described in claim 1, characterized in that: A foot pedal (10) is provided on the outside of the beam mounting frame (1). A passive plate (8) is fixedly installed on the outside of the drive shaft (2) near the foot pedal (10). An active plate (7) is fixedly installed on the outside of the other drive shaft (2). The active plate (7) and the passive plate (8) are hinged together at the ends away from the beam mounting frame (1) to a telescopic frame (9). The foot pedal (10) is fixedly installed on the upper end of the telescopic frame (9).

10. An electric pedal with a four-link shaft end wrapped to prevent mud and sand from entering, as described in claim 1, characterized in that: One of the vehicle beam mounting brackets (1) has a drive motor (11) fixedly mounted on its outer side, and the output shaft of the drive motor (11) is fixedly connected to its corresponding drive shaft (2).

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