Mechanical rotor brake device for preventing brake pad from tilting

Abstract

This invention relates to the field of mechanical helicopter rotor brake technology, and particularly to a mechanical rotor brake device for preventing brake pad tilting. The braking force is applied to the upper brake pad assembly via a T-shaped pressure plate, and simultaneously transmitted to the screw plug and guide post via rocker arms B, C, A, and D, thus applying pressure to the upper brake pad assembly through these three force points. This eliminates the tilting of the upper brake pad assembly, pushing it downwards to contact the brake disc and lower brake pad assembly, generating a frictional torque. This frictional torque increases with the increase of the operating force, effectively preventing brake pad tilting, improving braking efficiency, preventing partial contact between the brake pad and brake disc during braking, eliminating problems such as severe localized wear of the brake pads caused by uneven wear, and increasing the number of braking cycles and service life of the brake pads. Furthermore, it is easy for aircraft maintenance and is readily applicable, possessing high practicality.

Description

Technical Field

[0001] This invention relates to the field of mechanical helicopter rotor brake technology, and particularly to a mechanical rotor brake device that prevents brake pad tilting. Background Technology

[0002] Mechanical rotor brake systems are used in helicopter rotor braking systems. A mechanical rotor brake system consists of a rotor brake control device, a force transmission device, and the mechanical rotor brake itself. When rotor braking is required, the pilot pulls the control handle of the rotor brake control device, switching it from a released brake state to a brake state. The rotor brake control device outputs force and displacement, and the force transmission device transmits this force and displacement to the control lever of the rotor brake, driving the rotor brake to generate braking torque and execute rotor braking. Mechanical rotor brake systems have the following advantages: no separate hydraulic or electrical source is required, resulting in no power demand on the entire aircraft; purely mechanical working principle; convenient structural layout with no power constraints; high technological maturity; and high safety and reliability.

[0003] Existing mechanical rotor brake systems suffer from localized brake pad wear in the brake pad assembly, resulting in prolonged braking time. Analysis revealed the following cause: During braking, the operating force on the rotor brake control lever's power arm is transmitted to the upper brake pad assembly via the control lever's resistance arm, propelling the upper brake pad assembly. The upper brake pad assembly is suspended on two parallel guide pillars, resulting in a single point of thrust. This thrust point is some distance from the plane formed by the center lines of the two guide pillars, and there is a certain clearance between the guide pillars and the guide sleeves. Under the action of the thrust, the upper brake pad assembly of the rotor brake system tilts. Furthermore, the point of thrust application is not on the symmetrical plane of the two guide pillars, leading to different torques acting on the two guide pillars and causing the upper brake pad assembly to tilt. When the upper brake pad assembly tilts, the brake pads partially contact the brake disc during braking, causing uneven wear. This leads to localized wear of the brake pads and increases the friction between the guide post and guide sleeve in the rotor brake system. The tilting of the upper brake pad assembly also pushes the brake disc to tilt, causing partial contact between the brake disc and the lower brake pad, resulting in uneven wear on the lower brake. The increased friction between the guide post and guide sleeve reduces the normal pressure between the brake disc and brake pads, lowering the frictional torque between the brake disc and brake pad friction pairs, thus reducing braking efficiency and increasing braking time. Uneven wear exacerbates wear at localized points on the brake pads, reducing the number of braking cycles and the lifespan of the brake pads. Improving the braking efficiency and brake pad lifespan of rotor brake systems is a technical problem that needs to be solved. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention provides a mechanical rotor brake device for preventing brake pad tilting.

[0005] The present invention discloses the following technical solution: a mechanical rotor brake device for preventing brake pad tilting, comprising a housing, an upper brake pad assembly, a guide sleeve, a return spring, a guide post, a screw plug, a bolt, a nut, a shaft A, a rocker arm A, a shaft B, a rocker arm B, a shaft C, a control lever, a shaft D, rivets A and B, a T-shaped pressure plate, a shaft E, a rocker arm C, a shaft F, a rocker arm D, a shaft G, a lower brake pad assembly, and a brake disc. The housing is provided with a first guide sleeve hole, a second guide sleeve hole, a first support, a second support, a third support, and a first axial hole. The first support is provided with a first radial hole, the second support is provided with a second radial hole, a third radial hole, and a fifth radial hole, and the third support is provided with a fourth radial hole. The guide post is provided with a first axial threaded hole, a first shaft hole, a second shaft hole, and a first shoulder. There are two guide sleeves, which are respectively installed in the first guide sleeve hole and the second guide sleeve hole of the housing. The guide post is installed in the guide sleeve. The upper brake pad assembly is fixed to the guide post by bolts and nuts. A return spring is installed between the guide post and the first shoulder of the guide sleeve. The contour surfaces of the first cam of rocker arm A and the third cam of rocker arm D abut against the upper end face of the screw plug.

[0006] Furthermore, rocker arm A is generally fan-shaped, with a sixth radial hole, a first cam, a first fan-shaped window, and a first fan-shaped tooth. Rocker arms B and C are generally fan-shaped, with a seventh radial hole, a first fan-shaped groove, a second fan-shaped groove, and a first rivet hole. Rocker arm D is generally fan-shaped, with an eighth radial hole, a third cam, a third fan-shaped window, and a second fan-shaped tooth. Rocker arms B and C are symmetrical from left to right and are respectively mounted on the fifth radial hole and the third radial hole of the second support of the housing via shaft C and shaft E. The first fan-shaped tooth of rocker arm A is embedded in the first fan-shaped groove of rocker arm B, and the second fan-shaped tooth of rocker arm D is embedded in the first fan-shaped groove of rocker arm C. Shaft B passes through the first fan-shaped window of rocker arm A and the second fan-shaped window of rocker arm B, and shaft F passes through the second fan-shaped window of rocker arm C and the third fan-shaped window of rocker arm D.

[0007] Furthermore, the T-shaped pressure plate consists of two parts: a fan-shaped pressure plate and a pressure rod. It is provided with a fourth fan-shaped window. The T-shaped pressure plate is installed in the first axial hole of the housing through the pressure rod. The left and right ends of the T-shaped pressure plate are respectively embedded in the second fan-shaped grooves of rocker arms B and C. It is connected to rocker arms B and C through rivets A and B passing through the first rivet hole and the fourth fan-shaped window.

[0008] Furthermore, the control lever is provided with a first pin hole, a second pin hole, a power arm, a drag arm, and a second cam. The control lever is connected to the second support of the housing through its second pin hole and shaft D. Shaft D is installed in the second radial hole of the housing. The control lever can rotate around shaft D. The profile surface of the second cam of the control lever abuts against the upper surface of the fan-shaped pressure plate of the T-shaped pressure plate. The control lever is connected to the force transmission device of the mechanical rotor brake system through its first pin hole.

[0009] Furthermore, the lower brake pad assembly is detachably mounted on the housing, forming an integral part of the housing.

[0010] Beneficial effects: Compared with the prior art, the mechanical rotor brake device for preventing brake pad tilting of the present invention has the function of preventing brake pad tilting, reducing the friction between the guide post and the guide sleeve of the rotor brake device, improving braking efficiency, preventing local contact between the brake pad and the brake disc during braking, eliminating severe wear of local points of the brake pad caused by uneven wear, increasing the number of braking cycles and service life of the brake pad; and it is convenient for machine maintenance, easy to promote and apply, and has high practicality. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0012] Figure 2 for Figure 1 Sectional view at point AA;

[0013] Figure 3 This is a top view of the housing of the present invention;

[0014] Figure 4 This is a schematic front view of the housing of the present invention;

[0015] Figure 5 for Figure 3 Sectional view at BB;

[0016] Figure 6 This is a schematic diagram of the guide post structure of the present invention;

[0017] Figure 7 This is a schematic front view of the rocker arm A of the present invention;

[0018] Figure 8 This is a top sectional view of the rocker arm A of the present invention;

[0019] Figure 9 This is a schematic diagram of the structure of rocker arm B and rocker arm C of the present invention;

[0020] Figure 10 This is a schematic front view of the joystick of the present invention;

[0021] Figure 11 This is a cross-sectional view of the left side of the joystick of the present invention;

[0022] Figure 12 This is a schematic diagram of the rocker arm D of the present invention;

[0023] Figure 13 This is a top sectional view of the rocker arm D of the present invention;

[0024] Figure 14 This is a schematic diagram of the T-shaped pressure plate structure of the present invention;

[0025] In the diagram: 1-Housing, 2-Upper brake pad assembly, 3-Guide sleeve, 4-Return spring, 5-Guide post, 6-Plug, 7-Bolt, 8-Nut, 9-Shaft A, 10-Rocker arm A, 11-Shaft B, 12-Rocker arm B, 13-Shaft C, 14-Control lever, 15-Shaft D, 16-Rivet A, 17-Rivet B, 18-T-type pressure plate, 19-Shaft E, 20-Rocker arm C, 21-Shaft F, 22-Rocker arm D, 23-Shaft G, 24-Lower brake pad assembly, 25-Brake disc;

[0026] 101-First guide sleeve hole, 102-Second guide sleeve hole, 103-First support, 104-Second support, 105-Third support, 106-First axial hole, 1031-First radial hole, 1041-Second radial hole, 1042-Third radial hole, 1043-Fifth radial hole, 1051-Fourth radial hole, 51-First axial threaded hole, 52-First shaft hole, 53-Second shaft hole, 54-First shoulder, 1001-Sixth radial hole, 1002-First cam, 1003-First... Sector-shaped window, 1004-first sector-shaped protrusion, 121-seventh radial hole, 122-first sector-shaped groove, 123-second sector-shaped groove, 124-first rivet hole, 125-second sector-shaped window, 141-first pin hole, 142-second pin hole, 143-power arm, 144-resistance arm, 145-second cam, 221-eighth radial hole, 222-third cam, 223-third sector-shaped window, 224-second sector-shaped protrusion, 181-sector-shaped pressure plate, 182-pressure rod, 183-fourth sector-shaped window. Detailed Implementation

[0027] like Figures 1 to 8As shown, a mechanical rotor brake device for preventing brake pad tilting includes a housing 1, an upper brake pad assembly 2, a guide sleeve 3, a return spring 4, a guide post 5, a screw plug 6, a bolt 7, a nut 8, a shaft A9, a rocker arm A10, a shaft B11, a rocker arm B12, a shaft C13, a control lever 14, a shaft D15, rivets A16 and B17, a T-shaped pressure plate 18, a shaft E19, a rocker arm C20, a shaft F21, a rocker arm D22, a shaft G23, and a lower brake pad assembly 2. 4 and brake disc 25, the housing 1 is provided with a first guide sleeve hole 101, a second guide sleeve hole 102, a first support 103, a second support 104, a third support 105 and a first axial hole 106, the first support 103 is provided with a first radial hole 1031, the second support 104 is provided with a second radial hole 1041, a third radial hole 1042 and a fifth radial hole 1043, the third support 105 is provided with a fourth radial hole 1051, the... The guide post 5 is provided with a first axial threaded hole 51, a first shaft hole 52, a second shaft hole 53, and a first shaft shoulder 54; there are two guide sleeves 3, which are respectively installed in the first guide sleeve hole 101 and the second guide sleeve hole 102 of the housing 1. The guide post 5 is installed in the guide sleeve 3 and can move axially within the guide sleeve 3. The upper brake pad assembly 2 is fixed to the guide post 5 by bolts 7 and nuts 8, forming an integral part with the guide post 5. A return spring 4 is installed between the guide post 5 and the first shaft shoulder 54 of the guide sleeve 3. In the brake release state, under the action of the return spring 4, the upper brake pad assembly 2 moves upward and disengages from the brake disc 25. A screw plug 6 is installed in the first axial threaded hole 51 of the guide post 5. The contour surfaces of the first cam 1002 of the rocker arm A10 and the third cam 222 of the rocker arm D22 abut against the upper end face of the screw plug 6. The screw plug 6 is used to transmit the operating force transmitted by the rocker arm A10 and the rocker arm D22 to the upper brake pad assembly 2 through the guide post 5.

[0028] The rocker arm A10 is generally fan-shaped and has a sixth radial hole 1001, a first cam 1002, a first fan-shaped window 1003, and a first fan-shaped tooth 1004. The rocker arms B12 and C20 are generally fan-shaped and have a seventh radial hole 121, a first fan-shaped groove 122, a second fan-shaped groove 123, and a first rivet hole 124. The rocker arm D22 is generally fan-shaped and has an eighth radial hole 221, a third cam 222, a third fan-shaped window 223, and a second fan-shaped tooth 224. The rocker arms B12 and C20 are symmetrical and are mounted on the fifth radial hole 1043 and the third radial hole 1042 of the second support of the housing 1 via shafts C13 and E19, respectively. The first fan-shaped tooth 1004 of the rocker arm A10 is embedded in the first fan-shaped groove 122 of the rocker arm B12, and the second fan-shaped tooth 1004 of the rocker arm D22 is embedded in the first fan-shaped groove 122 of the rocker arm B12. The convex tooth 224 is embedded in the first sector groove 122 of the rocker arm C20. The shaft B11 passes through the first sector window 1003 of the rocker arm A10 and the second sector window 125 of the rocker arm B12. The shaft F21 passes through the first sector window 1003 of the rocker arm C20 and the third sector window 223 of the rocker arm D22. The shafts B11 and F21 can transmit the operating force transmitted by the rocker arms B12 and C20 to the rocker arms A10 and D22. The rocker arm A10 can swing around the shaft A9, and the rocker arm D22 can swing around the shaft G23. The rocker arms B12 and C20 are respectively mounted on the second support 104 of the housing 1 through the shaft C13, the shaft E19, the fifth radial hole 1043 of the housing 1, and the third radial hole 1042. The rocker arm B12 can rotate around the shaft C13, and the rocker arm C20 can rotate around the shaft E19.

[0029] The T-shaped pressure plate 18 consists of two parts: a fan-shaped pressure plate 181 and a pressure rod 182. It is provided with a fourth fan-shaped window 183. The cross-section of the pressure rod 182 can be designed to be circular or fan-shaped. The T-shaped pressure plate 18 is installed in the first axial hole 106 of the housing 1 through the pressure rod 182. The left and right ends of the T-shaped pressure plate 18 are respectively embedded in the second fan-shaped grooves 123 of the rocker arm B12 and the rocker arm C20. It is connected to the rocker arm B12 and the rocker arm C20 through rivets A16 and B17 passing through the first rivet hole 124 and the fourth fan-shaped window 183. The rivets A16 and B17 can transmit the operating force acting on the T-shaped pressure plate 18 to the rocker arm B12 and the rocker arm C20.

[0030] The control lever 14 is provided with a first pin hole 141, a second pin hole 142, a power arm 143, a drag arm 144, and a second cam 145. The control lever 14 is connected to the second support 104 of the housing 1 through its second pin hole 142 and shaft D15. The shaft D15 is installed in the second radial hole 1041 of the housing 1, and the control lever 14 can rotate around the shaft D15. The contour surface of the second cam 145 of the control lever 14 abuts against the upper surface of the fan-shaped pressure plate 181 of the T-shaped pressure plate 18. The control lever 14 is connected to the mechanical rotor brake system through its first pin hole 141. The system is connected to a force transmission device, which causes the control lever 14 to rotate around axis D15, applying pressure to the T-shaped pressure plate 18. The pressure is transmitted through rivets A16, B17, rocker arm B12, rocker arm C20, shaft B11, and shaft F21 to rocker arm A10 and rocker arm D22, and then to the guide posts 5 on both sides and the upper brake pad assembly 2. On the symmetrical plane of the two guide posts 5, the upper brake pad assembly 2 is tilted due to the different torques of the thrust acting on the two guide posts 5. The lower brake pad assembly 24 is detachably installed on the housing 1 and forms an integral part with the housing 1.

[0031] Working principle: When rotor braking is required, the pilot pulls the control handle. The control force is transmitted to the power arm 143 of the control stick 14 through the intermediate force transmission device. The control stick 14 rotates clockwise, and the drag arm 144 contacts the T-shaped pressure plate 18, transmitting the control force to the T-shaped pressure plate 18. Through rivets A16 and B17, the control force is simultaneously transmitted to rocker arms B12 and C20, and through shafts B11 and F21, the control force is simultaneously transmitted to rocker arms A10 and D22. The control force pushes the T-shaped pressure plate 18 downward, transmitting the control force to the upper brake pad assembly 2. At the same time, rocker arm B12 swings clockwise around shaft C13, and rocker arm C20 swings counterclockwise around shaft E19. When the needle swings, shafts B11 and F21 move upward, rocker arm A10 swings counterclockwise around shaft A9, and rocker arm D22 swings clockwise around shaft G23, transmitting the operating force to the upper brake pad assembly 2 through the screw plug 6 and guide post 5. The force is transmitted to the upper brake pad assembly 2 through three points, simultaneously pushing the upper brake pad assembly 2 downward. After the upper brake pad assembly 2 moves downward a certain distance, the upper brake pad assembly 2, brake disc 25, and lower brake pad assembly 24 come into contact, generating frictional torque and initiating braking. The frictional torque increases with the increase of the operating force. The operating force is simultaneously transmitted to the upper brake pad assembly 2 through the pressure rod 182 and the guide posts 5 on both sides, eliminating the tilt of the upper brake pad assembly 2.

[0032] When the brake needs to be released, the pilot pushes the control handle, and the control force is transmitted to the power arm 143 of the control stick 14 through the intermediate force transmission mechanism. The control stick 14 rotates counterclockwise, the resistance arm 144 disengages from the T-shaped pressure plate 18, the return spring 4 pushes the guide post 5 to move upward, and the upper brake pad assembly 2, brake disc 25, and lower brake pad assembly 24 disengage, thus releasing the brake.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mechanical rotor brake device for preventing brake pad tilting, comprising a housing (1), an upper brake pad assembly (2), a guide sleeve (3), a return spring (4), a guide post (5), a screw plug (6), a bolt (7), a nut (8), (9), a rocker arm A (10), a shaft B (11), a rocker arm B (12), a shaft C (13), a control lever (14), a shaft D (15), a rivet A (16), a rivet B (17), a T-shaped pressure plate (18), a shaft E (19), a rocker arm C (20), a shaft F (21), a rocker arm D (22), a shaft G (23), a lower brake pad assembly (24), and a brake disc (25), characterized in that: The housing (1) is provided with a first guide sleeve hole (101), a second guide sleeve hole (102), a first support (103), a second support (104), a third support (105), and a first axial hole (106). The first support (103) is provided with a first radial hole (1031), the second support (104) is provided with a second radial hole (1041), a third radial hole (1042), and a fifth radial hole (1043), and the third support (105) is provided with a fourth radial hole (1051). The guide post (5) is provided with a first axial threaded hole (51), a first shaft hole (52), and a first axial threaded hole (106). Two shaft holes (53) and a first shaft shoulder (54); there are two guide sleeves (3), which are respectively installed in the first guide sleeve hole (101) and the second guide sleeve hole (102) of the housing (1), the guide post (5) is installed in the guide sleeve (3), the upper brake pad assembly (2) is fixed on the guide post (5) by bolts (7) and nuts (8), a return spring (4) is installed between the guide post (5) and the first shaft shoulder (54) of the guide sleeve (3), and the contour surfaces of the first cam (1002) of the rocker arm A (10) and the third cam (222) of the rocker arm D (22) abut against the upper end face of the screw plug (6); The rocker arm A (10) is fan-shaped in general and has a sixth radial hole (1001), a first cam (1002), a first sector window (1003), and a first sector tooth (1004). The rocker arms B (12) and C (20) are fan-shaped in general and have a seventh radial hole (121), a first sector groove (122), a second sector groove (123), and a first rivet hole (124). The rocker arm D (22) is fan-shaped in general and has an eighth radial hole (221), a third cam (222), a third sector window (223), and a second sector tooth (224). The rocker arms B (12) and C (20) are symmetrical from left to right and are respectively connected to shaft C (13) and shaft E. (19) Installed on the fifth radial hole (1043) and the third radial hole (1042) of the second support (104) of the housing (1), the first sector tooth (1004) of the rocker arm A (10) is embedded in the first sector groove (122) of the rocker arm B (12), the second sector tooth (224) of the rocker arm D (22) is embedded in the first sector groove (122) of the rocker arm C (20), the shaft B (11) passes through the first sector window (1003) of the rocker arm A (10) and the second sector window (125) of the rocker arm B (12), and the shaft F (21) passes through the second sector window (125) of the rocker arm C (20) and the third sector window (223) of the rocker arm D (22).

2. The mechanical rotor brake device for preventing brake pad tilting according to claim 1, characterized in that: The T-shaped pressure plate (18) consists of two parts: a fan-shaped pressure plate (181) and a pressure rod (182). It is provided with a fourth fan-shaped window (183). The T-shaped pressure plate (18) is installed in the first axial hole (106) of the housing (1) through the pressure rod (182). The left and right ends of the T-shaped pressure plate (18) are respectively embedded in the second fan-shaped groove (123) of the rocker arm B (12) and the rocker arm C (20). It is connected to the rocker arm B (12) and the rocker arm C (20) through the first rivet hole (124) and the fourth fan-shaped window (183) of the rocker arm C (20) by rivets A (16) and rivets B (17).

3. The mechanical rotor brake device for preventing brake pad tilting according to claim 1, characterized in that... The control lever (14) is provided with a first pin hole (141), a second pin hole (142), a power arm (143), a resistance arm (144), and a second cam (145). The control lever (14) is connected to the second support (104) of the housing (1) through its second pin hole (142) and shaft D (15). Shaft D (15) is installed in the second radial hole (1041) of the housing (1). The control lever (14) can rotate around shaft D (15). The contour surface of the second cam (145) of the control lever (14) abuts against the upper surface of the fan-shaped pressure plate (181) of the T-shaped pressure plate (18). The control lever (14) is connected to the force transmission device of the mechanical rotor brake system through its first pin hole (141).

4. The mechanical rotor brake device for preventing brake pad tilting according to claim 1, characterized in that... The lower brake pad assembly (24) is detachably mounted on the housing (1).

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