Helicopter damping pedal

Abstract

The invention belongs to the technical field of mechanical design, and discloses a helicopter vibration reduction pedal which comprises an inner cylinder, a medium cylinder, an outer cylinder, a front end fixed sealing plate, a spring assembly, a counterweight assembly, an eccentric cylinder and an eccentric cylinder rotating assembly. The inner cylinder and the original pedal are coaxially and fixedly connected, the outer cylinder and the original pedal are coaxially arranged, and the front ends of the outer cylinder and the inner cylinder are connected through a front end fixing sealing plate; the medium cylinder sleeves the outer side of the inner cylinder and is coaxial with the inner cylinder, and a medium cavity is formed between the inner cylinder and the medium cylinder and is filled with a damping medium; the eccentric cylinder sleeves the outer side of the medium cylinder; a rotating shaft of the eccentric cylinder is coaxial with the medium cylinder; a counterweight assembly is arranged in the eccentric cylinder, and a spring assembly is arranged between the counterweight assembly and the medium cylinder; the eccentric cylinder rotating assembly is arranged at the rear end of the outer cylinder and connected with the eccentric cylinder to drive the eccentric cylinder to rotate.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical design, and in particular relates to a helicopter vibration reduction pedal. Background Art

[0002] The helicopter pedals, also known as the rudder, are mainly used to control the pitch of the helicopter's tail rotor blades by manipulating the line system, changing the balance state of the helicopter's torque and counter-torque, and changing the helicopter's heading to the left or right, thereby changing the helicopter's forward direction.

[0003] The tail rotor blades of a certain type of helicopter vibrate greatly. When the vibration of the tail rotor blades is transmitted to the pedals through the rigid rod control line system, the pedals will also vibrate violently at high frequencies, causing numbness and pain in the pilot's feet. The main solutions include reducing the vibration level of the tail rotor blades or using a non-rigid control line system, but the research and improvement and economic costs are high, and the improvement is difficult to implement. Summary of the invention

[0004] Purpose of the invention: to provide a helicopter vibration reduction pedal. The purpose of the first layer of vibration reduction is achieved by using high-density small particles such as lead sand to follow the motion energy absorption effect, and the purpose of the second layer of vibration reduction can be achieved by using springs with different extension and contraction amounts to load heavy objects to produce different vibration reduction effects. The helicopter pilot can feel and adjust different vibration reduction effects by using the feet of the driving pedal, which is scientific and reasonable, and provides great convenience for the helicopter pilot.

[0005] Technical Solution

[0006] A helicopter vibration reduction pedal, comprising: an inner cylinder, a medium cylinder, an outer cylinder, a front end fixed sealing plate, a spring assembly, a counterweight assembly, an eccentric cylinder, and an eccentric cylinder rotating assembly;

[0007] The inner tube is coaxial with the original pedal and fixedly connected, the outer tube is coaxially arranged with the original pedal, and the front ends of the outer tube and the inner tube are connected through a front fixed sealing plate;

[0008] The medium cylinder is sleeved on the outside of the inner cylinder and is coaxial with the inner cylinder. A medium cavity is formed between the inner cylinder and the medium cylinder and is filled with a vibration-damping medium.

[0009] The eccentric cylinder is sleeved on the outside of the medium cylinder, and the rotating axis of the eccentric cylinder is coaxial with the medium cylinder;

[0010] A counterweight assembly is arranged in the eccentric cylinder, and a spring assembly is arranged between the counterweight assembly and the medium cylinder;

[0011] The eccentric cylinder rotating assembly is arranged at the rear end of the outer cylinder and is connected to the eccentric cylinder to drive the eccentric cylinder to rotate.

[0012] Furthermore, the eccentric cylinder is a cylinder with an opening at one end, and an eccentric shaft is provided at the non-open end, and the eccentric shaft is arranged at a dividing point of four to six of the diameter.

[0013] Further, the counterweight assembly includes: a counterweight tube and a counterweight rod;

[0014] The counterweight tube is a cylinder with one end open, which is arranged between the medium tube and the eccentric tube. A counterweight rod is placed at the lower end of the counterweight tube. The counterweight rod rolls in the counterweight tube under the action of gravity; the upper outer side of the counterweight tube contacts the inner wall of the eccentric tube.

[0015] Further, the spring assembly includes: a spring top plate, a spring bottom plate and a spring group fixed therebetween;

[0016] The spring floor is fixed on the outer wall of the medium cylinder, and the spring top plate is in contact with the inner wall of the weight tube;

[0017] When the side with a shorter radius of the eccentric tube rotates upward, the spring is compressed to an upper limit, and when the side with a longer radius of the eccentric tube rotates upward, the spring is compressed to a lower limit.

[0018] The spring group includes at least five springs, which are identical to each other, or have the same length but different spring constants.

[0019] Further, the eccentric cylinder rotating assembly includes: an eccentric cylinder gear, an intermediate small gear, an intermediate large gear, an adjusting wheel gear, and an adjusting wheel;

[0020] The eccentric cylinder gear is coaxially connected with the eccentric shaft of the eccentric cylinder, the eccentric cylinder gear is meshed with the intermediate pinion gear, the intermediate pinion gear is coaxially fixedly connected with the intermediate large gear, the intermediate large gear is meshed with the adjusting wheel gear; the adjusting wheel gear is coaxially fixedly connected with the adjusting wheel;

[0021] The middle large gear and the middle small gear are hinged on the middle gear fixing plate through the middle shaft; the adjusting wheel and the adjusting wheel gear are hinged on the adjusting wheel fixing plate through the middle shaft.

[0022] Furthermore, an annular boss is provided on one side of the outer cylinder close to the adjusting wheel gear, the diameter of the adjusting wheel is larger than the diameter of the annular boss, and the outer contour of the adjusting wheel is arranged with anti-slip grooves.

[0023] Furthermore, the outer diameter of the medium cylinder is 1.5 times the outer diameter of the inner cylinder, and the vibration damping medium is lead, tungsten, etc., with a density greater than 10g / cm 3 The material is a room temperature solid high-density granular body with a diameter not exceeding 0.25nm, and the filling volume of the vibration-damping medium is 60% to 90% of the volume of the medium cavity.

[0024] Furthermore, the weight tube and weight rod are made of iron, copper, lead, tungsten, etc., with a density greater than 7g / cm 3 Solid metal at room temperature.

[0025] Furthermore, it also includes: a spring plate sliding mechanism, which is arranged on the inner surface of the front fixed sealing plate and is used to limit the spring top plate so that the spring top plate moves radially along the spring plate sliding mechanism.

[0026] Furthermore, the outer diameter of the counterweight tube is 0.6 to 0.7 of the inner diameter of the eccentric tube.

[0027] In summary, the beneficial effects of the present invention are as follows:

[0028] (1) The present invention uses the energy absorption effect of small particles of high density such as lead sand to follow the movement, thereby achieving the purpose of the first layer of vibration reduction. Using springs with different extension and contraction amounts to load heavy objects can produce different vibration reduction effects, thereby achieving the purpose of the second layer of vibration reduction, which is scientific.

[0029] (2) The present invention uses a clever internal structure and a small structural volume to compactly achieve the energy absorption effect of high-density small particles following the movement and the different vibration reduction effects of spring-loaded weights with different expansion and contraction amounts. The design is ingenious.

[0030] (3) The present invention saves a lot of structure through precise design, has low manufacturing complexity, simple assembly method, clear and easy-to-understand usage logic, small size and light weight, and good economy.

[0031] (4) The present invention allows the helicopter pilot to feel and adjust different vibration reduction effects by using the driving pedals, which is scientific and reasonable, provides great convenience to the helicopter pilot, has good human-machine efficiency, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The figure is a schematic diagram of the appearance of a helicopter vibration reduction pedal.

[0033] Figure 2 A cross-sectional view of a helicopter vibration reduction pedal. DETAILED DESCRIPTION

[0034] A helicopter vibration reduction pedal comprises: a spring plate sliding mechanism 1, an inner cylinder 2, a medium cylinder 3, a counterweight rod 4, a counterweight tube 5, a connecting bolt 6, a medium cavity 7, an eccentric cylinder gear 8, an adjusting wheel gear 9, an adjusting wheel fixing plate 10, an adjusting wheel 11, an intermediate large gear 12, an intermediate gear fixing plate 13, an intermediate small gear 14, an eccentric cylinder fixing plate 15, an eccentric cylinder 16, a spring 17, a spring bottom plate 18, a spring top plate 19, an outer cylinder 20, and a front end fixing sealing plate 21.

[0035] System device composition and main functions:

[0036] (1) The vibration-damping pedal is a cylindrical structure, the outermost layer is an outer tube 20, the innermost layer is an inner tube 2, the front end is a front fixed sealing plate 21, the rear end is an adjusting wheel 11, and the original pedal tail section is screwed into the inner tube 2;

[0037] (2) The inner tube 2, the medium tube 3, the counterweight tube 5, the eccentric tube gear 8, the adjusting wheel gear 9, the adjusting wheel fixing plate 10, the adjusting wheel 11, the eccentric tube fixing plate 15, the outer tube 20, and the front fixed sealing plate 21 are all coaxial with the original pedal tail section;

[0038] (3) The inner diameter of the inner tube 2 is equal to but slightly larger than the outer diameter of the original pedal tail section. The inner side of the inner tube 2 is provided with threads, and the connecting bolt 6 is fixedly connected to the original pedal tail section. The outer side of the inner tube 2 is provided with threads, and the connecting bolt 6 forms a threaded fit with the inner tube 2.

[0039] (4) The front end of the medium cylinder 3 is fixedly connected to the front fixed sealing plate 21. The outer diameter of the medium cylinder 3 is 1.5 times the outer diameter of the inner cylinder 2. The medium cylinder 3 is sleeved outside the inner cylinder 2. The gap between the medium cylinder 3 and the inner cylinder 2 forms a medium cavity 7. The medium cavity 7 stores high-density small particles such as lead sand. The volume of the stored high-density small particles is required to be four-fifths of the volume of the medium cavity 7. When the pedal vibrates greatly, the high-density small particles follow the movement to absorb energy, thereby achieving the purpose of the first layer of vibration reduction;

[0040] (5) The lower end of the spring 17 is fixed to the spring bottom plate 18, and the upper end is fixed to the spring top plate 19. Under the action of gravity, the spring bottom plate 18 rests on the top of the medium cylinder 3. The spring top plate 19 can slide freely in the vertical direction through the spring plate sliding mechanism 1, so that the spring can be extended and retracted in the vertical direction. The spring plate sliding mechanism 1 is arranged on the upper half of the front fixed sealing plate 21, and the front end of the spring top plate 19 is restricted to the end of the front fixed sealing plate 21 in the axial direction of the pedal to prevent its axial movement. Generally, no less than 5 groups of springs 17 are arranged between the spring bottom plate 18 and the spring top plate 19;

[0041] (6) The weight tube 5 is arranged between the eccentric cylinder 16 and the spring top plate 19, with its top resting on the upper end of the spring top plate 19 and a weight rod 4 placed at the bottom. The weight tube 5 can cover the inner cylinder 2, the dielectric cylinder 3, the spring 17, the spring bottom plate 18, the spring top plate 19 and other structures. The weight tube 5 and the weight rod 4 are both made of high-density materials such as lead. The large mass of the weight tube 5 and the weight rod 4 presses the springs 17 of different lengths to achieve the purpose of vibration reduction at different vibration frequencies and intensities of the second layer;

[0042] (7) The eccentric cylinder 16 rotates around the eccentric shaft at its rear end, and the eccentric shaft at its rear end is arranged at the 4:6 division point of the diameter of the eccentric cylinder 16. When the eccentric cylinder 16 rotates around the eccentric shaft at its rear end, the distance from the upper end of the cylinder wall of the eccentric cylinder 16 to the lower end of the spring 17 changes continuously, so that the length of the spring changes continuously. The eccentric cylinder 16 is hinged to the outer cylinder 20 through the eccentric cylinder fixing plate 15.

[0043] (8) The eccentric cylinder gear 8 is arranged at the rear end of the eccentric shaft of the eccentric cylinder 16. The eccentric cylinder gear 8 is meshed with the intermediate pinion 14. The intermediate pinion 14 is coaxially fixed with the intermediate large gear 12. The intermediate large gear 12 is meshed with the adjusting wheel gear 9. The adjusting wheel gear 9 is coaxially fixed with the adjusting wheel 11. The intermediate large gear 12 and the intermediate pinion 14 are hinged on the intermediate gear fixing plate 13 through the intermediate shaft. The transmission ratio of the eccentric cylinder gear 8 to the intermediate pinion 14 is 1:2, and the transmission ratio of the intermediate large gear 12 to the adjusting wheel gear 9 is 3:1. The number of teeth and the diameter of the intermediate large gear 12 are twice those of the intermediate pinion 14. Therefore, for every 6 rotations of the adjusting wheel 11, the eccentric cylinder 16 rotates 1 circle.

[0044] (9) The adjusting wheel 11 and the adjusting wheel gear 9 are hinged on the adjusting wheel fixing plate 10 through an intermediate shaft. The diameter of the adjusting wheel 11 is slightly larger than the diameter of the boss of the outer cylinder 20. The outer contour of the adjusting wheel 11 is arranged with anti-slip grooves. The helicopter pilot steps on and turns the outer contour of the adjusting wheel 11 with his feet to rotate the adjusting wheel 11. Through the intermediate transmission mechanism, the eccentric cylinder 16 rotates, and the expansion and contraction amount of the spring 17 changes.

[0045] (10) When the pedal vibrates greatly, the weight rod 4 and the weight tube 5 press on the spring 17 with different expansion and contraction amounts adjusted by the adjusting wheel 11 through their own weight, which can produce different vibration reduction effects. The helicopter pilot can feel and adjust different vibration reduction effects by stepping on and turning the adjusting wheel 11 with his foot.

[0046] (11) The front end fixed sealing plate 21 is fixed to the front end of the outer tube 20, and the adjusting wheel fixing plate 10 is fixed to the rear end of the outer tube 20. An annular boss protrudes from the rear end of the outer tube 20 wall, and its function is to prevent the helicopter pilot's foot from accidentally touching the adjusting wheel 11 when the pedal vibrates well.

[0047] System operation process

[0048] (1) First, the connecting bolt 6 is coaxially fixed to the rear end of the original pedal tail section, and the device is screwed into the connecting bolt 6. The connecting bolt 6 and the inner tube 2 form a threaded fit, so that the arrow mark on the front fixed sealing plate 21 is vertically upward, such as Figure 2 As shown. Thus, the device is assembled on the original pedal tail section.

[0049] (2) When the pedal vibrates greatly, the medium cavity 7 stores small particles of high density such as lead sand and absorbs energy along with the movement, thus achieving the purpose of the first layer of vibration reduction;

[0050] (3) When the pedal vibration is so large that the helicopter pilot cannot accept it, the helicopter pilot steps on and turns the outer contour of the adjusting wheel 11 to rotate the adjusting wheel 11;

[0051] (4) The adjusting wheel 11 coaxially drives the adjusting wheel gear 9, which meshes with the intermediate large gear 12 to reduce the speed by 3 times. The intermediate large gear 12 coaxially drives the intermediate small gear 14, which meshes with the eccentric cylinder gear 8 to reduce the speed by 2 times. The eccentric cylinder gear 8 coaxially drives the eccentric cylinder 16. Therefore, for every 6 rotations of the adjusting wheel 11, the eccentric cylinder 16 rotates 1 circle.

[0052] (5) The eccentric cylinder 16 rotates, causing the expansion and contraction amount of the spring 17 to change.

[0053] (6) When the pedal vibrates greatly, the weight rod 4 and the weight tube 5 press on the spring 17 with different expansion and contraction amounts adjusted by the adjusting wheel 11 through their own weight, which can produce different vibration reduction effects. The helicopter pilot can feel and adjust different vibration reduction effects by stepping on and turning the adjusting wheel 11 with his foot.

[0054] (1) The inner tube 2, the medium tube 3, the counterweight tube 5, the eccentric tube gear 8, the adjusting wheel gear 9, the adjusting wheel fixing plate 10, the adjusting wheel 11, the eccentric tube fixing plate 15, the outer tube 20, and the front fixed sealing plate 21 are all coaxial with the original pedal tail section;

[0055] (2) The inner diameter of the inner tube 2 is equal to but slightly larger than the outer diameter of the original pedal tail section, and the connecting bolt 6 forms a threaded fit with the inner tube 2;

[0056] (3) The outer diameter of the medium cylinder 3 is 1.5 times the outer diameter of the inner cylinder 2. The medium cavity 7 stores high-density small particles such as lead sand. The volume of the stored high-density small particles is required to be four-fifths of the volume of the medium cavity 7. When the pedal vibrates greatly, the high-density small particles absorb energy with the movement, thereby achieving the purpose of the first layer of vibration reduction;

[0057] (4) The spring top plate 19 can slide freely in the vertical direction through the spring plate sliding mechanism 1, so that the spring can be extended and retracted in the vertical direction. The front end of the spring top plate 19 is restricted to the front end of the fixed sealing plate 21 in the axial direction of the pedal to prevent its axial movement. Generally, no less than 5 groups of springs 17 are arranged between the spring bottom plate 18 and the spring top plate 19;

[0058] (5) The counterweight tube 5 and the counterweight rod 4 are both made of high-density materials such as lead. The large mass of the counterweight tube 5 and the counterweight rod 4 presses the springs 17 of different lengths to achieve the purpose of vibration reduction at different vibration frequencies and intensities of the second layer;

[0059] (6) The eccentric cylinder 16 rotates around the eccentric shaft at its rear end, and the eccentric shaft at its rear end is arranged at the four-sixth division point of the diameter of the eccentric cylinder 16. When the eccentric cylinder 16 rotates around the eccentric shaft at its rear end, the distance from the upper end of the cylinder wall of the eccentric cylinder 16 to the lower end of the spring 17 changes continuously, so that the length of the spring changes continuously.

[0060] (7) The eccentric cylinder gear 8 meshes with the intermediate pinion 14, and the intermediate large gear 12 meshes with the adjusting wheel gear 9. The transmission ratio between the eccentric cylinder gear 8 and the intermediate pinion 14 is 1:2, and the transmission ratio between the intermediate large gear 12 and the adjusting wheel gear 9 is 3:1. The number of teeth and the diameter of the intermediate large gear 12 are twice those of the intermediate pinion 14. Therefore, for every 6 rotations of the adjusting wheel 11, the eccentric cylinder 16 rotates 1 circle.

[0061] (8) The diameter of the adjusting wheel 11 is slightly larger than the diameter of the boss of the outer cylinder 20. The outer contour of the adjusting wheel 11 is arranged with anti-slip grooves. The helicopter pilot steps on and turns the outer contour of the adjusting wheel 11 with his feet to rotate the adjusting wheel 11. Through the transmission mechanism in the middle, the eccentric cylinder 16 rotates, and the expansion and contraction amount of the spring 17 changes.

[0062] (9) When the pedal vibrates greatly, the weight rod 4 and the weight tube 5 press on the spring 17 with different expansion and contraction amounts adjusted by the adjusting wheel 11 through their own weight, which can produce different vibration reduction effects. The helicopter pilot can feel and adjust different vibration reduction effects by stepping on and turning the adjusting wheel 11 with his foot.

Claims

1. A helicopter vibration reduction pedal, characterized in that: The vibration-damping pedal comprises: an inner cylinder, a medium cylinder, an outer cylinder, a front fixed sealing plate, a spring assembly, a counterweight assembly, an eccentric cylinder, and an eccentric cylinder rotating assembly; The inner tube is coaxial with the original pedal and fixedly connected, the outer tube is coaxially arranged with the original pedal, and the front ends of the outer tube and the inner tube are connected through a front fixed sealing plate; The medium cylinder is sleeved on the outside of the inner cylinder and is coaxial with the inner cylinder. A medium cavity is formed between the inner cylinder and the medium cylinder and is filled with a vibration-damping medium. The eccentric cylinder is sleeved on the outside of the medium cylinder, and the rotating axis of the eccentric cylinder is coaxial with the medium cylinder; A counterweight assembly is arranged in the eccentric cylinder, and a spring assembly is arranged between the counterweight assembly and the medium cylinder; The eccentric cylinder rotating assembly is arranged at the rear end of the outer cylinder and is connected to the eccentric cylinder to drive the eccentric cylinder to rotate.

2. The helicopter vibration reduction pedal according to claim 1, characterized in that: The eccentric cylinder is a cylinder with an opening at one end, and an eccentric shaft is arranged at the non-opening end, and the eccentric shaft is arranged at a dividing point of four to six of the diameter.

3. The helicopter vibration reduction pedal according to claim 2, characterized in that: The counterweight assembly includes: a counterweight tube and a counterweight rod; The counterweight tube is a cylinder with one end open, which is arranged between the medium tube and the eccentric tube. A counterweight rod is placed at the lower end of the counterweight tube. The counterweight rod rolls in the counterweight tube under the action of gravity; the upper outer side of the counterweight tube contacts the inner wall of the eccentric tube.

4. The helicopter vibration reduction pedal according to claim 3, characterized in that: The spring assembly comprises: a spring top plate, a spring bottom plate and a spring group fixed therebetween; The spring floor is fixed on the outer wall of the medium cylinder, and the spring top plate is in contact with the inner wall of the weight tube; When the side with a shorter radius of the eccentric tube rotates upward, the spring is compressed to an upper limit, and when the side with a longer radius of the eccentric tube rotates upward, the spring is compressed to a lower limit. The spring group includes at least five springs, which are identical to each other, or have the same length but different spring constants.

5. The helicopter vibration reduction pedal according to claim 4, characterized in that: The eccentric cylinder rotating assembly includes: an eccentric cylinder gear, an intermediate small gear, an intermediate large gear, an adjusting wheel gear, and an adjusting wheel; The eccentric cylinder gear is coaxially connected with the eccentric shaft of the eccentric cylinder, the eccentric cylinder gear is meshed with the intermediate pinion gear, the intermediate pinion gear is coaxially fixedly connected with the intermediate large gear, the intermediate large gear is meshed with the adjusting wheel gear; the adjusting wheel gear is coaxially fixedly connected with the adjusting wheel; The middle large gear and the middle small gear are hinged on the middle gear fixing plate through the middle shaft; the adjusting wheel and the adjusting wheel gear are hinged on the adjusting wheel fixing plate through the middle shaft.

6. The helicopter vibration reduction pedal according to claim 5, characterized in that: An annular boss is provided on one side of the outer cylinder close to the adjusting wheel gear, the diameter of the adjusting wheel is larger than the diameter of the annular boss, and the outer contour of the adjusting wheel is arranged with anti-slip grooves.

7. The helicopter vibration reduction pedal according to claim 6, characterized in that: The outer diameter of the medium tube is 1.5 times the outer diameter of the inner tube. The vibration damping medium is lead, tungsten, etc., with a density greater than 10g / cm 3 The material is a room temperature solid high-density granular body with a diameter not exceeding 0.25nm, and the filling volume of the vibration-damping medium is 60% to 90% of the volume of the medium cavity.

8. The helicopter vibration reduction pedal according to claim 7, characterized in that: The weight tube and weight rod are made of iron, copper, lead, tungsten, etc. with a density greater than 7g / cm 3 Solid metal at room temperature.

9. The helicopter vibration reduction pedal according to claim 7, characterized in that: Also includes: The spring plate sliding mechanism is arranged on the inner surface of the front fixed sealing plate and is used to limit the spring top plate so that the spring top plate moves radially along the spring plate sliding mechanism.

10. The helicopter vibration reduction pedal according to claim 7, characterized in that: The outer diameter of the counterweight tube is 0.6 to 0.7 of the inner diameter of the eccentric tube.

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