Aircraft parking brake system

Abstract

The present invention discloses an aircraft parking brake system, which relates to the technical field of aircraft brakes. The system includes a brake device located on a wheel, a pressure accumulator for supplying oil to the brake device, the brake device includes a brake pad and a hydraulic cylinder assembly, the hydraulic cylinder assembly includes a cylinder body, a first piston and a first piston rod, the first piston is located in the cylinder body, one end of the first piston rod is connected to the first piston, and the other end is connected to the brake pad, a locking piece is provided on the first piston rod, the locking piece is slidably connected to the first piston rod, the locking piece can move axially along the first piston rod, and a locking hole is also provided on the inner wall of the cylinder body, the locking piece is used to be inserted into the locking hole and fix the first piston rod in the cylinder body. The present invention can fix the first piston rod in the cylinder body by using the cooperation between the provided locking inlet and the locking hole, thereby avoiding the situation where the aircraft slips due to insufficient hydraulic pressure in the cylinder body, and meeting the locking of any position of the first piston rod.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft brakes, and in particular to an aircraft parking brake system. Background Art

[0002] The function of the aircraft parking brake is to keep the brake mechanism in the brake position through the parking brake device to prevent the aircraft from sliding due to wind, ground slope and other problems when the aircraft stops on the ground for a long time, without the need for the pilot to continuously step on the brake pedal. The parking brake device on existing aircraft usually uses the pressure accumulator on the aircraft to provide pressure for the brake pads on the wheels to ensure that the brake pads can fit tightly with the turntable on the wheel, and uses the friction between the brake pads and the turntable on the wheel to achieve the purpose of braking. However, once the hydraulic pressure supplied to the brake device by the pressure accumulator is insufficient, the brakes are likely to fail and the aircraft will slip, causing serious property losses. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, and the purpose is to provide an aircraft parking brake system, which can fix the first piston rod in the cylinder body by the cooperation between the set locking inlet and the locking hole, thereby avoiding the situation where the aircraft slips due to insufficient hydraulic pressure in the cylinder body, and meeting the locking requirements of any position of the first piston rod.

[0004] The present invention is achieved through the following technical solutions:

[0005] An aircraft parking brake system includes a brake device located on a wheel and a pressure accumulator for supplying oil to the brake device. The brake device includes a brake pad and a hydraulic cylinder assembly. The hydraulic cylinder assembly includes a cylinder body, a first piston and a first piston rod. The first piston is located in the cylinder body. One end of the first piston rod is connected to the first piston, and the other end is connected to the brake pad. A locking piece is provided on the first piston rod. The locking piece is slidably connected to the first piston rod. The locking piece can move axially along the first piston rod. A locking hole is also provided on the inner wall of the cylinder body. The locking piece is used to be inserted into the locking hole and fix the first piston rod in the cylinder body.

[0006] Furthermore, a groove is provided on the side wall of the first piston rod, and the groove is distributed along the axial direction of the first piston rod;

[0007] A movable rod is also provided in the first piston rod, one end of the movable rod extends into the groove and is connected to the locking member, and the other end of the movable rod penetrates the brake pad along the axial direction of the first piston rod.

[0008] Furthermore, the locking member includes a movable block, a first elastic member and a locking rod, the side wall of the movable block is connected to the movable rod, and a first blind hole is also provided on the top of the movable block, one end of the first elastic member is fixed in the first blind hole, and the other end is connected to the locking rod, and the first elastic member is used to push the locking rod into the locking hole.

[0009] Furthermore, an unlocking hole is provided on the inner wall of the cylinder body, and the unlocking hole is communicated with the bottom of the locking hole;

[0010] The diameter of the locking rod is consistent with the inner diameter of the locking hole.

[0011] Furthermore, a second blind hole is provided at the end of the movable rod away from the locking member, a second elastic member and an extrusion rod are provided in the second blind hole, the outer diameter of the extrusion rod is consistent with the inner diameter of the second blind hole, and the second elastic member is used to push the extrusion rod to extend out of the brake pad;

[0012] The first piston rod is provided with a mounting hole for mounting a movable rod, the movable rod is located in the mounting hole, a limiting groove is provided on the inner wall of the mounting hole, a clamping plate is provided in the limiting groove, and the limiting groove is connected with the second blind hole through a hose.

[0013] Furthermore, the width of the groove is greater than the width of the movable block, and the contact surface between the movable block and the groove is a curved surface;

[0014] A rotating member is also provided in the first piston rod, and the rotating member is connected to the side wall of the movable block. The rotating member is used to drive the movable block to deflect in the groove to stagger the locking rod and the locking hole.

[0015] Furthermore, the rotating member includes a worm wheel and a worm meshing with the worm wheel, the worm wheel and the worm are both pre-buried in the first piston rod, and one end of the worm penetrates into the groove and is connected to the side wall of the movable block.

[0016] Furthermore, a receiving chamber is provided in the first piston rod;

[0017] A cavity is also provided in the first piston, and a second piston and a second piston rod are also provided in the cavity, one end of the second piston rod is connected to the second piston, and the other end extends into the accommodating cavity;

[0018] A rack meshing with the worm gear is also provided on the side wall of the second piston rod.

[0019] Furthermore, a telescopic tube is provided in the cylinder body, one end of the telescopic tube is sealedly connected to the first piston, and the other end is sealedly connected to the cylinder bottom on the cylinder body;

[0020] The cylinder body is also provided with a first oil inlet, a second oil inlet and a third oil inlet, and the second oil inlet is connected to the telescopic tube;

[0021] The telescopic tube is also in communication with the cavity through a channel.

[0022] Furthermore, a through hole is provided in the first piston rod, one end of the through hole is communicated with the groove, and the other end of the through hole is communicated with the accommodating cavity.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] 1. The present invention utilizes the cooperation between the locking member provided on the first piston rod and the locking hole on the inner wall of the cylinder body to fix the first piston rod in the cylinder body, thereby avoiding the situation where the first piston rod retreats due to insufficient hydraulic pressure in the cylinder body, thereby effectively preventing the aircraft from slipping;

[0025] 2. The locking member provided in the present invention can adjust the position of the locking member on the first piston rod through the movable rod, thereby ensuring that after the brake pad is worn and becomes thinner, the locking member can also fix the first piston rod in the cylinder body, thereby meeting the use of brake pads of different thicknesses;

[0026] 3. The present invention utilizes the rotating member to deflect the locking member in the groove, so that the locking member is staggered with the locking hole on the inner wall of the cylinder body, so that when the aircraft uses the brake device during normal takeoff or landing, the locking member will not lock the first piston rod, avoiding the occurrence of an emergency stop of the wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the hydraulic cylinder assembly of the present invention;

[0030] Figure 3 For the present invention Figure 2 The structural diagram of the enlarged part A in the middle;

[0031] Figure 4 It is a schematic diagram of the connection structure between the first piston rod and the brake pad of the present invention;

[0032] Figure 5 Schematic diagram of the connection structure between the first piston rod and the first piston of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the cross section of the first piston rod of the present invention;

[0034] Figure 7 It is a structural schematic diagram of another state of the first piston rod cross section of the present invention.

[0035] Marks and corresponding parts names in the attached drawings:

[0036] 1. Wheel; 2. Braking device; 3. Accumulator; 4. Cylinder bottom; 5. First oil inlet; 6. Cylinder body; 7. First piston; 8. Third oil inlet; 10. Brake pad; 11. Second oil inlet; 12. Telescopic tube; 13. First piston rod; 14. Movable rod; 15. Movable block; 16. First elastic member; 17. Locking rod; 19. Third elastic member; 20. Unlocking hole; 21. Limiting groove; 22. Clamping plate; 23. Hose; 24. Second elastic member; 25. Extrusion rod; 26. Second piston; 27. Fourth elastic member; 28. Second piston rod; 29. ​​Worm wheel; 30. Worm; 31. Through hole. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0038] like Figures 1 to 7 As shown, the present invention includes a brake device 2 located on a wheel 1, and a pressure accumulator 3 for supplying oil to the brake device 2, the brake device 2 includes a brake pad 10 and a hydraulic cylinder assembly, the hydraulic cylinder assembly includes a cylinder body 6, a first piston 7 and a first piston rod 13, the first piston 7 is located in the cylinder body 6, one end of the first piston rod 13 is connected to the first piston 7, and the other end is connected to the brake pad 10, a locking piece is provided on the first piston rod 13, the locking piece is slidably connected to the first piston rod 13, the locking piece can move axially along the first piston rod 13, and a locking hole is also provided on the inner wall of the cylinder body 6, the locking piece is used to be inserted into the locking hole and fix the first piston rod 13 in the cylinder body 6.

[0039] In the prior art, when an aircraft is on the ground, in order to prevent the aircraft from slipping, the aircraft's accumulator 3 is usually used to provide a certain amount of hydraulic pressure to the brake device 2 on the wheel 1, so that the brake disc of the brake device 2 is in close contact with the turntable on the wheel 1, thereby achieving the purpose of braking the wheel 1. However, in actual applications, since the aircraft usually uses a motor to supply the hydraulic oil in the accumulator 3 to the brake device 2, and the brushes inside the motor are worn and polluted by carbon deposits, the resistance of the motor becomes larger, resulting in insufficient hydraulic pressure provided by the accumulator 3 to the brake device 2, causing the aircraft to slip. For this reason, the technical solution is provided with a locking member on the first piston rod 13 of the brake device 2, and a locking member is also provided on the inner wall of the cylinder body 6. A locking hole is provided, so that when it is necessary to brake the aircraft parked on the ground, the hydraulic oil in the accumulator 3 is used to transport the hydraulic oil into the cylinder 6, forcing the first piston 7 in the cylinder 6 to drive the first piston rod 13 to move, so that the brake pad 10 on the first piston rod 13 is tightly attached to the turntable of the wheel 1, so as to achieve the purpose of braking the wheel 1. At this time, the locking piece arranged on the first piston rod 13 is just inserted into the locking hole, and the first piston rod 13 is fixed in the cylinder 6 by the locking piece. Therefore, when the hydraulic pressure in the cylinder 6 is insufficient, under the action of the locking piece, it is ensured that the brake pad 10 can be tightly attached to the turntable of the wheel 1, so as to avoid the first piston rod 13 from retreating and causing the aircraft to slip.

[0040] At the same time, since the brake pad 10 will wear during use, the thickness of the brake pad 10 will gradually become thinner. In order to ensure that the locking piece can meet the locking requirements under different thickness conditions, the position of the locking piece on the first piston rod 13 is adjustable, that is, when the brake pad 10 gradually wears during use, the locking piece on the first piston rod 13 can dynamically adjust its position to ensure that the locking piece can lock the first piston rod 13 at any position to prevent the first piston rod 13 from retreating when there is insufficient hydraulic pressure in the cylinder body 6.

[0041] A groove is provided on the side wall of the first piston rod 13, and the groove is distributed axially along the first piston rod 13; a movable rod 14 is also provided in the first piston rod 13, one end of the movable rod 14 extends into the groove and is connected to the locking member, and the other end passes through the brake pad 10 along the axial direction of the first piston rod 13.

[0042] In this embodiment, in order to ensure that the locking member can move on the first piston rod 13, thereby realizing the adjustment of the locking member to any position, a groove is provided on the first piston rod 13, and the position of the locking member in the groove can be adjusted by using the movable rod 14 provided in the first piston rod 13.

[0043] At the same time, in order to dynamically adjust the position of the locking piece in the groove according to the degree of wear of the brake pad 10, the present embodiment provides a movable rod 14 that penetrates the brake pad 10, that is, in the initial state when the brake pad 10 is not damaged, the first piston 7 drives the brake pad 10 on the first piston rod 13 to fit toward the turntable of the wheel 1, and when the brake pad 10 is tightly attached to the turntable on the wheel 1, the turntable forces the movable rod 14 provided in the first piston rod 13 to retract, and at this time, the locking piece connected to the movable rod 14 is exactly in the same radial direction as the locking hole, and the first piston rod 13 is fixed in the cylinder body 6 by the locking piece and the locking hole; and when the brake pad 10 is worn and its thickness becomes smaller, the length of the path of the first piston rod 13 pushed by the first piston 7 will increase, and under the action of the movable rod 14, it can be ensured that the provided locking piece is always in the same radial direction as the locking hole, thereby ensuring that the first piston rod 13 is telescoped to any position, and the provided locking piece can be connected to the locking hole and lock the first piston rod 13.

[0044] The locking member includes a movable block 15, a first elastic member 16 and a locking rod 17. The side wall of the movable block 15 is connected to the movable rod 14. A first blind hole is also provided on the top of the movable block 15. One end of the first elastic member 16 is fixed in the first blind hole, and the other end is connected to the locking rod 17. The first elastic member 16 is used to push the locking rod 17 into the locking hole.

[0045] In this embodiment, in order to ensure that the locking piece can cooperate with the locking hole provided on the inner wall of the cylinder body 6 to achieve the purpose of locking the first piston rod 13, a first elastic piece 16 and a locking rod 17 are provided on the movable block 15. When the locking rod 17 has not moved to the locking hole in the cylinder body 6, the locking rod 17 is squeezed under the action of the inner wall of the cylinder body 6, so that the locking rod 17 is retracted into the first blind hole of the movable block 15. At this time, the first elastic piece 16 is in a state of storing force; when the first piston 7 drives the brake pad 10 on the first piston rod 13 to move to fit with the turntable of the wheel 1, the locking rod 17 provided at this time is just in the same radial direction as the locking hole. Under the action of the first elastic piece 16, the locking rod 17 is pushed to be inserted into the locking hole, thereby achieving the cooperation between the locking piece and the locking hole.

[0046] An unlocking hole 20 is also provided on the inner wall of the cylinder body 6 , and the unlocking hole 20 is communicated with the bottom of the locking hole; the diameter of the locking rod 17 is consistent with the inner diameter of the locking hole.

[0047] In order to achieve rapid unlocking of the locking rod 17 in this embodiment, an unlocking hole 20 is provided on the inner wall of the cylinder body 6. When the brake pad 10 needs to be retracted, the accumulator 3 is used to transport hydraulic oil to the rod chamber of the cylinder body 6. After the hydraulic oil enters the cylinder body 6, it enters the locking hole through the unlocking hole 20, and finally the hydraulic oil acts on the end face of the locking rod 17, forcing the locking rod 17 originally inserted into the locking hole to retract into the first blind hole of the movable block 15, thereby achieving automatic unlocking of the locking member.

[0048] A second blind hole is provided at the end of the movable rod 14 away from the locking member, and a second elastic member 24 and an extrusion rod 25 are provided in the second blind hole. The outer diameter of the extrusion rod 25 is consistent with the inner diameter of the second blind hole, and the second elastic member 24 is used to push the extrusion rod 25 to extend out of the brake pad 10; a mounting hole for installing the movable rod 14 is provided on the first piston rod 13, and the movable rod 14 is located in the mounting hole. A limiting groove 21 is provided on the inner wall of the mounting hole, and a clamping plate 22 is provided in the limiting groove 21. The limiting groove 21 is connected to the second blind hole through a hose 23.

[0049] In this embodiment, in order to ensure that the locking member can fix the first piston rod 13 in the cylinder body 6 when the locking member cooperates with the locking hole, a second blind hole is further provided at the end of the movable rod 14, and an extrusion rod 25 is provided in the second blind hole, and the outer diameter of the extrusion rod 25 is consistent with the inner diameter of the second blind hole. The second blind hole is filled with hydraulic oil. Therefore, when the first piston 7 drives the brake pad 10 on the first piston rod 13 to fit on the turntable of the wheel 1, the turntable forces the extrusion rod 25 to retract into the second blind hole. In the process of retracting the extrusion rod 25 into the second blind hole, the extrusion rod 25 will squeeze the hydraulic oil in the second blind hole, forcing the hydraulic oil to be transferred to the limiting groove 21 through the hose 23. The hydraulic oil entering the limiting groove 21 will force the clamping plate 22 to move toward the movable rod 14, and finally the clamping plate 22 is clamped on the movable rod 14, so that the movable rod 14 and the first piston rod 13 are fixed in the moving state, and the first piston rod 13 is fixed in the cylinder body 6 by the provided locking member.

[0050] In order to improve the clamping force of the clamping plate 22 on the movable rod 14, the clamping surface of the clamping plate 22 and the surface of the movable rod 14 are made with tiny bumps to increase the roughness of the clamping plate 22 and the movable rod 14, thereby improving the clamping force of the clamping plate 22 and the movable rod 14.

[0051] A third elastic member 19 is also provided in the groove of the first piston rod 13. The third elastic member 19 is used to push the movable block 15 to move toward the movable rod 14. In order to prevent the turntable of the wheel 1 from driving the movable rod 14 and the movable block 15 to move back together when pushing the extrusion rod 25 to retreat, a third elastic member 19 is also provided in the groove. The third elastic member 19 can prevent the extrusion rod 25 from driving the movable rod 14 to move back when it retracts.

[0052] The width of the groove is greater than the width of the movable block 15, and the contact surface between the movable block 15 and the groove is a curved surface; a rotating member is also provided in the first piston rod 13, and the rotating member is connected to the side wall of the movable block 15, and the rotating member is used to drive the movable block 15 to deflect in the groove, so as to stagger the locking rod 17 and the locking hole.

[0053] In this embodiment, since the brake pad 10 is also used as a brake during normal takeoff or landing of the aircraft, in order to avoid interference of the locking member with the aircraft in this state, a rotating member is also provided in the first piston rod 13. The locking member can be rotated by the rotating member, so that the locking rod 17 on the locking member rotates circumferentially around the first piston rod 13, and finally the locking rod 17 is rotated to a point where it is not in the same axial direction as the locking hole on the inner wall of the cylinder body 6, so that the locking hole and the locking rod 17 are staggered. In this way, during the extension and retraction of the first piston rod 13 in the cylinder body 6, the locking member will be in an invalid state, so as to avoid the locking rod 17 being inserted into the locking hole and affecting the normal takeoff or landing of the aircraft.

[0054] The rotating member includes a worm wheel 29 and a worm 30 meshing with the worm wheel 29 . The worm wheel 29 and the worm 30 are both pre-buried in the first piston rod 13 , and one end of the worm 30 penetrates into the groove and is connected to the side wall of the movable block 15 .

[0055] In this embodiment, in order to ensure that the rotating member can normally drive the movable block 15, a worm wheel 29 and a worm 30 are provided in the first piston rod 13. When the worm wheel 29 rotates in the first piston rod 13, it can drive the worm 30 to rotate, thereby driving the movable block 15 to rotate in the groove, and finally staggering the locking rod 17 and the locking hole.

[0056] A accommodating cavity is also provided in the first piston rod 13; a cavity is also provided in the first piston 7, and a second piston 26 and a second piston rod 28 are also provided in the cavity. One end of the second piston rod 28 is connected to the second piston 26, and the other end extends into the accommodating cavity; a rack meshing with the worm gear 29 is also provided on the side wall of the second piston rod 28.

[0057] In this embodiment, in order to ensure that the worm gear 29 can rotate in the first piston rod 13, a second piston 26 and a second piston rod 28 are also provided in the cavity of the first piston 7. When hydraulic oil is transported into the cavity in the first piston 7, the hydraulic oil forces the second piston 26 to push the second piston rod 28 to move. When the second piston rod 28 moves, the rack provided on the side wall of the second piston rod 28 drives the worm gear 29 to rotate, thereby realizing the rotation of the movable block 15 in the groove.

[0058] A fourth elastic member 27 is further disposed in the cavity, and the fourth elastic member 27 is used to provide a certain buffering effect on the second piston 26 .

[0059] A telescopic tube 12 is also provided in the cylinder body 6, one end of the telescopic tube 12 is sealedly connected to the first piston 7, and the other end is sealedly connected to the cylinder bottom 4 on the cylinder body 6; a first oil inlet 5, a second oil inlet 11 and a third oil inlet 8 are also provided on the cylinder body 6, and the second oil inlet 11 is connected to the telescopic tube 12; the telescopic tube 12 is also connected to the cavity through a channel.

[0060] In this embodiment, when the accumulator 3 delivers hydraulic oil to the second oil inlet 11, the hydraulic oil entering the telescopic tube 12 will act on the second piston 26 in the cavity through the channel, thereby realizing the normal operation of the worm gear 29 and the worm 30; and when it is necessary to drive the first piston 7 forward, the accumulator 3 is used to deliver hydraulic oil to the first oil inlet 5; and when it is necessary to retract the first piston 7, hydraulic oil is delivered to the third oil inlet 8.

[0061] A through hole 31 is further provided in the first piston rod 13 , one end of the through hole 31 is communicated with the groove, and the other end of the through hole 31 is communicated with the accommodating cavity.

[0062] In order to ensure that the second piston 26 can retreat in this embodiment, a through hole 31 is provided. When hydraulic oil is delivered to the cylinder body 6 through the third oil inlet 8, the hydraulic oil entering the cylinder body 6 acts on the end of the second piston rod 28 through the through hole 31, thereby enabling the second piston 26 to retreat to the initial position and correct the deflected locking member.

[0063] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An aircraft parking brake system, comprising a brake device (2) located on a wheel (1), and a pressure accumulator (3) for supplying oil to the brake device (2), wherein the brake device (2) comprises a brake pad (10) and a hydraulic cylinder assembly, wherein the hydraulic cylinder assembly comprises a cylinder body (6), a first piston (7) and a first piston rod (13), wherein the first piston (7) is located in the cylinder body (6), and one end of the first piston rod (13) is connected to the first piston (7), and the other end is connected to the brake pad (10), wherein: The first piston rod (13) is provided with a locking piece, the locking piece is slidably connected to the first piston rod (13), the locking piece can move axially along the first piston rod (13), and the inner wall of the cylinder body (6) is also provided with a locking hole, the locking piece is used to be inserted into the locking hole and fix the first piston rod (13) in the cylinder body (6); A groove is provided on the side wall of the first piston rod (13), and the groove is distributed axially along the first piston rod (13); A movable rod (14) is also provided in the first piston rod (13), one end of the movable rod (14) extends into the groove and is connected to the locking member, and the other end of the movable rod (14) penetrates the brake pad (10) along the axial direction of the first piston rod (13); The locking member comprises a movable block (15), a first elastic member (16) and a locking rod (17); a side wall of the movable block (15) is connected to the movable rod (14); a first blind hole is further provided at the top of the movable block (15); one end of the first elastic member (16) is fixed in the first blind hole, and the other end is connected to the locking rod (17); the first elastic member (16) is used to push the locking rod (17) to be inserted into the locking hole; A second blind hole is provided at the end of the movable rod (14) away from the locking member, a second elastic member (24) and an extrusion rod (25) are provided in the second blind hole, the outer diameter of the extrusion rod (25) is consistent with the inner diameter of the second blind hole, and the second elastic member (24) is used to push the extrusion rod (25) to extend out of the brake pad (10); The first piston rod (13) is provided with a mounting hole for mounting a movable rod (14), the movable rod (14) is located in the mounting hole, a limiting groove (21) is provided on the inner wall of the mounting hole, a clamping plate (22) is provided in the limiting groove (21), and the limiting groove (21) is connected to the second blind hole through a hose (23); The width of the groove is greater than the width of the movable block (15), and the contact surface between the movable block (15) and the groove is a curved surface; A rotating member is also provided in the first piston rod (13), the rotating member being connected to the side wall of the movable block (15), the rotating member being used to drive the movable block (15) to deflect in the groove, thereby offsetting the locking rod (17) from the locking hole; The rotating member comprises a worm wheel (29) and a worm (30) meshing with the worm wheel (29); the worm wheel (29) and the worm (30) are both pre-buried in the first piston rod (13); and one end of the worm (30) penetrates into the groove and is connected to the side wall of the movable block (15).

2. An aircraft parking brake system according to claim 1, characterized in that: An unlocking hole (20) is also provided on the inner wall of the cylinder body (6), and the unlocking hole (20) is communicated with the bottom of the locking hole; The diameter of the locking rod (17) is consistent with the inner diameter of the locking hole.

3. An aircraft parking brake system according to claim 1, characterized in that: A receiving chamber is also provided in the first piston rod (13); A cavity is also provided in the first piston (7), and a second piston (26) and a second piston rod (28) are also provided in the cavity. One end of the second piston rod (28) is connected to the second piston (26), and the other end extends into the accommodating cavity. A rack meshing with the worm gear (29) is also provided on the side wall of the second piston rod (28).

4. An aircraft parking brake system according to claim 3, characterized in that: A telescopic tube (12) is also provided in the cylinder body (6), one end of the telescopic tube (12) is sealedly connected to the first piston (7), and the other end is sealedly connected to the cylinder bottom (4) on the cylinder body (6); The cylinder body (6) is also provided with a first oil inlet (5), a second oil inlet (11) and a third oil inlet (8), and the second oil inlet (11) is in communication with the telescopic tube (12); The telescopic tube (12) is also connected to the cavity through a channel.

5. An aircraft parking brake system according to claim 3, characterized in that: A through hole (31) is also provided in the first piston rod (13); one end of the through hole (31) is in communication with the groove, and the other end of the through hole (31) is in communication with the accommodating cavity.

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