Manual passive hydraulic brake actuation for brakes

Abstract

The manual passive hydraulic brake operating device for brake comprises an operating mechanism and an actuating mechanism, the output end of the operating mechanism is connected with the input end of the actuating mechanism, the actuating mechanism has a return oil cavity and a working cavity, the working cavity is connected with a rotor brake device and an oil tank through an auxiliary mechanism, and the return oil cavity is connected with the oil tank. When the operating mechanism is pulled, the pressure of the working cavity is increased, brake pressure is output to the rotor brake device to realize braking, and the return oil cavity sucks oil from the oil tank to avoid negative pressure of the return oil cavity. When the brake pressure exceeds a predetermined value, the auxiliary mechanism is used to reduce the pressure to keep the specified brake pressure. When the operating mechanism is pushed, the pressure of the working cavity is reduced to zero. If there is negative pressure in the working cavity, the auxiliary mechanism is used to suck oil from the oil tank to eliminate the negative pressure, and the oil in the return oil cavity flows back to the oil tank to avoid high pressure of the return oil cavity. The application has the functions of safety valve and locking to prevent overhigh brake pressure and misoperation.

Description

Manual passive hydraulic brake operating device for braking. Technical Field

[0001] This invention relates to the field of aircraft braking system technology, and in particular to a manual passive hydraulic brake control device for braking. Background Technology

[0002] Weight is a crucial design parameter for aircraft. To improve flight altitude and range, various aircraft models strive to reduce design weight while ensuring functionality, reliability, and safety. To further reduce weight, the overall design of a certain helicopter eliminated components such as the hydraulic pump, oil filter, accumulator, hydraulic lines, safety valve, and hydraulic brake valve that provide pressure to the rotor brakes. The requirement was to develop a novel manual passive hydraulic brake control device. This device must be manually operated to output high-pressure oil to pressure the helicopter rotor brakes in the absence of a hydraulic power source. Furthermore, the device must have a safety valve function to regulate the pressure when it is too high, ensuring it meets the specified pressure value, and to replenish the oil in the rotor brake system's internal cavity when the brake is released. Additionally, it must have a locking function in both the parked and released brake states to prevent accidental activation. Summary of the Invention

[0003] The purpose of this invention is to provide a manual passive hydraulic brake operating device for braking, which solves the above problems, so that when the brake pressure is too high, the pressure is adjusted to ensure that the brake pressure meets the specified pressure value, and when the brake is released, the oil in the inner cavity of the rotor brake device is replenished in time when it is insufficient.

[0004] To achieve the above objectives, the following technical solution is adopted: a manual passive hydraulic brake control device for braking, comprising a control mechanism and an actuation mechanism. The output end of the control mechanism is connected to the input end of the actuation mechanism. The output end of the actuation mechanism is connected to the inner cavity of the rotor brake device and an auxiliary mechanism, respectively. The output end of the auxiliary mechanism is connected to an oil tank. The actuation mechanism has a return oil chamber and a working chamber. The working chamber and the return oil chamber are connected through the auxiliary mechanism, and the return oil chamber is connected to the oil tank through the auxiliary mechanism. When braking, pulling the control mechanism increases the pressure in the working chamber, outputting braking pressure to the rotor brake device to achieve braking. At the same time, the return oil chamber draws oil from the oil tank to avoid negative pressure in the return oil chamber. If the braking pressure exceeds a predetermined value, the auxiliary mechanism reduces the pressure to maintain the specified braking pressure. When it is necessary to release the brake, pushing the control mechanism reduces the pressure in the working chamber to zero. If there is negative pressure in the working chamber, the auxiliary mechanism draws oil from the oil tank to eliminate the negative pressure. At the same time, the oil in the return oil chamber flows back to the oil tank to avoid high pressure in the return oil chamber.

[0005] Preferably, the actuation mechanism includes a housing, the housing having a first mounting hole with an upper opening, an oil outlet hole being provided at the bottom of the first mounting hole, the lower end of the oil outlet hole extending through to the outside of the housing, and the lower end of the oil outlet hole communicating with the inner cavity of the rotor brake device through an oil nozzle, an actuating cylinder being installed in the first mounting hole, a piston being provided in the actuating cylinder, and a support being connected to the upper end face of the housing;

[0006] The upper end of the piston passes through the support and is connected to an operating mechanism, which is mounted on the support.

[0007] The piston has a stepped shaft hole inside its lower end. The stepped shaft hole includes a first screw hole and a second mounting hole from bottom to top. A first spring seat is provided at the bottom of the second mounting hole. A spring A is connected to the first spring seat. A first valve seat is connected to the first screw hole. The first valve seat has a first oil hole that runs through the piston from top to bottom. The upper end of the first oil hole has a sealing surface A with a conical cross section. A valve A that mates with the sealing surface A is provided at the upper end of the first valve seat. The other end of the spring A is connected to the valve A.

[0008] The piston, the first valve seat, and the valve A are arranged to divide the actuator into an upper and lower oil return chamber and a working chamber.

[0009] The auxiliary mechanism is located inside the housing on one side of the oil outlet. The housing is provided with an oil return hole A. One end of the oil return hole A is connected to the oil outlet, and the other end is connected to the upper end of the auxiliary mechanism. An oil return hole B is provided on the upper side wall of the actuating cylinder. An oil return hole C is provided in the housing along the vertical direction. The upper end of the oil return hole C is connected to the oil return hole B through an oil return hole D on the housing. The lower end of the oil return hole C is connected to the lower end of the auxiliary mechanism through an oil return hole E.

[0010] The piston is provided with an oil return hole F, which is located on the side wall of the second mounting hole, and the oil return chamber is connected to the second mounting hole through the oil return hole F.

[0011] Preferably, the auxiliary mechanism includes a second screw hole and a third mounting hole arranged coaxially. An oil return groove is provided between the second screw hole and the third mounting hole. The other end of the oil return hole A is connected to the third mounting hole. A second spring seat is provided at the bottom of the third mounting hole. A spring B is connected to the second spring seat. An oil suction nozzle is connected to the second screw hole. The end of the oil suction nozzle adjacent to the second screw hole has a sealing surface B with a conical cross-section. A valve B that mates with the sealing surface B is provided at the upper end of the oil suction nozzle. The other end of the spring B is connected to the valve B. An oil return hole G is provided in the radial direction of the oil suction nozzle. The outside of the oil return hole G is connected to the oil return groove. The inside of the oil return hole G is connected to the oil suction hole on the oil suction nozzle. The oil return groove is connected to the other end of the oil return hole E. The lower end of the oil suction nozzle is connected to the oil tank.

[0012] Preferably, the operating mechanism includes two mounting seats disposed on the upper end of the support. The two mounting seats are symmetrically arranged in a front-to-back direction. A cam is connected between the two mounting seats on the left side via a transition shaft. The cam is located between the two mounting seats. Each adjacent side of the two mounting seats is provided with a sliding groove with the transition shaft as the rotation center. A rocker arm mechanism that cooperates with the sliding groove is connected to the cam. The rocker arm mechanism is capable of locking when the cam rotates to a predetermined angle. The cam is provided with an arc-shaped groove formed by cam profile A and cam profile B. The support is provided with a through hole for the piston to pass through. The piston located at the upper end of the through hole is provided with a pin mounting hole. A pin is installed in the pin mounting hole. The front and rear ends of the pin are located in the arc-shaped groove formed by cam profile A and cam profile B.

[0013] Preferably, the rocker arm mechanism includes a rocker arm, in which a third screw hole, a guide hole, and a limiting hole are sequentially arranged along the axial direction. A locking rod is provided on the guide hole and the limiting hole. The locking rod sequentially includes a guide shaft slidably connected to the guide hole and a limiting shaft slidably connected to the limiting hole, and one end of the limiting shaft extends outside the limiting hole by a predetermined distance. A push shaft is connected between the guide shaft and the limiting shaft. A spring positioning shaft is provided at the end of the locking rod adjacent to the cam. A stud is provided on the cam. A fixing hole opening towards one side of the sliding groove is provided in the stud. The rocker arm is connected to the stud through the third screw hole. A spring C is connected to the bottom of the fixing hole. The other end of the spring C is connected to the spring positioning shaft.

[0014] The guide hole wall is provided with a waist-shaped hole that runs through the front and back. The guide shaft is provided with a locking pin hole in the radial direction. A locking pin is installed in the locking pin hole. The front and rear ends of the locking pin pass through the waist-shaped hole and extend into the sliding groove.

[0015] The sliding groove is provided with a brake release locking groove and a brake locking groove at both ends, and the brake release locking groove and the brake locking groove are arranged in the radial direction.

[0016] Preferably, the radius of rotation of the rocker arm is greater than the distance from the axis of the piston to the axis of the adapter shaft.

[0017] Preferably, the perpendicular distance from the normal to the axis of the adapter shaft is equal for each point on the cam surface A and cam surface B of the cam.

[0018] Preferably, one end of the limiting shaft extends out of the limiting hole and has a smooth spherical surface.

[0019] The beneficial effects achieved by this invention are as follows:

[0020] The manual passive hydraulic brake control device provided by this invention is designed according to actual needs, simplifying the rotor brake system, reducing the overall weight, and improving the comprehensive performance of the helicopter. It features small size, light weight, and good practicality and usability, making it easy to promote and apply. Furthermore, this invention can adjust the oil flow according to the pressure status of the return oil chamber and the working chamber. When the oil in the rotor brake device's internal chamber is insufficient, an auxiliary mechanism allows oil from the oil tank to flow back to the working chamber as a supplement. Simultaneously, when the pressure in the working chamber exceeds a predetermined value, an auxiliary mechanism allows oil in the working chamber to be output to the oil tank for pressure relief, ensuring that the braking pressure meets the specified value. The included rocker arm mechanism enables brake release and locking functions, preventing accidental brake release or switching due to misoperation, thus preventing accidents and improving operational safety. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the manual passive hydraulic brake control device of the present invention.

[0022] Figure 2 is a schematic diagram of the external structure of the manual passive hydraulic brake operating device of the present invention.

[0023] Figure 3 is a schematic diagram of the internal structure of the manual passive hydraulic brake operating device of the present invention.

[0024] Figure 4 is a top view of the shell structure.

[0025] Figure 5 is a schematic diagram of the AA section structure in Figure 4.

[0026] Figure 6 is a schematic diagram of the BB section structure in Figure 5.

[0027] Figure 7 is a schematic diagram of the CC section structure in Figure 5.

[0028] Figure 8 is a schematic diagram of the actuator cylinder structure.

[0029] Figure 9 is a schematic diagram of the piston structure.

[0030] Figure 10 is a schematic diagram of the first valve seat structure.

[0031] Figure 11 is a schematic diagram of the oil suction nozzle structure.

[0032] Figure 12 is a front structural diagram of the connection between the support and the mounting base.

[0033] Figure 13 is a schematic diagram of the side structure connecting the support and the mounting base.

[0034] Figure 14 is a top view of the connection between the support and the mounting base.

[0035] Figure 15 is a schematic diagram of the rocker arm structure.

[0036] Figure 16 is a schematic diagram of the locking bar structure.

[0037] Figure 17 is a schematic diagram of the cam structure.

[0038] Figure 18 is a schematic diagram of the cam side structure. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Referring to Figures 1-18, a manual passive hydraulic brake control device for braking includes a control mechanism and an actuation mechanism. The output end of the control mechanism is connected to the input end of the actuation mechanism. The output end of the actuation mechanism is connected to the inner cavity of the rotor brake device and the auxiliary mechanism, respectively. The output end of the auxiliary mechanism is connected to the oil tank. The actuation mechanism has a working chamber N and a return oil chamber M. The working chamber N and the return oil chamber M are connected through the auxiliary mechanism. The return oil chamber M is connected to the oil tank. When braking is required, the control mechanism is manually driven, which in turn drives the actuating mechanism. Pressure is built up in the working chamber N, and the pressure is output to the inner cavity of the rotor brake device, driving the rotor brake device to apply the brakes. At the same time, the return oil chamber draws oil from the oil tank to prevent negative pressure in the return oil chamber. If the braking pressure exceeds the predetermined value, the pressure is reduced by the auxiliary mechanism to maintain the specified braking pressure. When the brake needs to be released, the control mechanism is manually driven in the reverse direction, which drives the actuating mechanism to return to its original position. The pressure in the working chamber N drops to zero, and the rotor brake device releases the brakes. If there is negative pressure in the working chamber, the auxiliary mechanism draws oil from the oil tank to eliminate the negative pressure. At the same time, the oil in the return oil chamber flows back to the oil tank to prevent high pressure in the return oil chamber.

[0042] In this embodiment, the actuating mechanism includes a housing 1. The housing 1 has a first mounting hole 2 with an upper opening. An oil outlet hole 3 is provided at the bottom of the first mounting hole 2. The lower end of the oil outlet hole 3 extends through the housing 1, and the lower end of the oil outlet hole 3 communicates with the inner cavity of the rotor brake device through an oil outlet nozzle 4. Specifically, the lower end of the oil outlet hole 3 is a threaded hole 301. The oil outlet nozzle 4 is fixedly connected to the threaded hole 301 by threads. A first sealing groove 401 is provided on the oil outlet nozzle 4, and a first sealing ring 402 is provided in the first sealing groove 401, so that the oil outlet nozzle 4 and the threaded hole 301 achieve a sealing effect. An actuating cylinder 5 is installed in the first mounting hole 2. A second sealing groove 501 is provided on the outside of the actuating cylinder 5, and a second sealing ring 502 is provided in the second sealing groove 501, so that the outer wall of the actuating cylinder 5 and the inner wall of the first mounting hole 2 achieve a sealing fit. A piston 6 is provided in the actuating cylinder 5. The inverted T-shaped structure allows the lower section of piston 6 to slide and seal with the actuator cylinder 5, while the upper section of piston 6 has a gap with the actuator cylinder 5. A third sealing groove 601 is provided on the outside of the lower section of piston 6, and a third sealing ring 602 is installed inside the third sealing groove 601 to achieve a sealing fit between the lower section of piston 6 and the inner wall of actuator cylinder 5. A support 7 is connected to the upper end face of the housing 1. Specifically, the support 7 has multiple first connecting holes 701, and the upper end face of the housing 1 has second connecting holes 702 corresponding to the first connecting holes 701. First bolts 703 are installed on the first connecting holes 701 and the second connecting holes 702, and are fixedly connected by flat washers 704, spring washers 705, and nuts 706. Furthermore, a fourth sealing groove 707 is provided on the lower end face of the support 7, and a fourth sealing ring 708 is installed inside the fourth sealing groove 707, achieving a sealing fit between the lower end face of the support 7 and the upper end face of the housing 1.

[0043] The upper end of the piston 6 passes through the support 7 and is connected to an operating mechanism, which is mounted on the support 7.

[0044] The piston 6 has a stepped shaft hole inside its lower end. The stepped shaft hole includes a first screw hole 8 and a second mounting hole 9 from bottom to top. A first spring seat 10 is provided at the bottom of the second mounting hole 9. A spring A11 is connected to the first spring seat 10. A first valve seat 12 is connected to the first screw hole 8. Specifically, a fifth sealing groove 1201 is provided on the outer side of the first valve seat 12. A fifth sealing ring 1202 is installed in the fifth sealing groove 1201 so that the first valve seat 12 and the first screw hole 8 can achieve a sealing connection. The first valve seat 12 has a first oil hole 13 that runs through the top and bottom. The upper end of the first oil hole 13 has a sealing surface A14 with a conical cross section. A valve A15 that mates with the sealing surface A14 is provided on the upper end of the first valve seat 12. The other end of the spring A11 is connected to the valve A15.

[0045] The piston 6, the first valve seat 12 and the valve A15 are configured to divide the actuator cylinder 5 into an upper and lower oil return chamber M and a working chamber N.

[0046] The auxiliary mechanism is located inside the housing 1 on one side of the oil outlet 3. The housing 1 is provided with an oil return hole A16. One end of the oil return hole A16 is connected to the oil outlet 3, and the other end is connected to the upper end of the auxiliary mechanism. The upper side wall of the actuating cylinder 5 is provided with an oil return hole B17. An oil return hole C18 is provided in the housing 1 along the vertical direction, and its lower end passes through the outside of the housing 1 and is closed by the first screw plug a. The upper end of the oil return hole C18 is connected to the oil return hole B17 through the oil return hole D19 on the housing 1. The left end of the oil return hole D19 extends to the outside of the housing 1 and is closed by the second screw plug b. The lower end of the oil return hole C18 is connected to the lower end of the auxiliary mechanism through the oil return hole E20. The left side of the oil return hole E20 extends to the outside of the housing 1 and is closed by the third screw plug c, so that the oil return hole C18 has an intersection point with the oil return hole D19 and the oil return hole E20 respectively, so as to facilitate processing.

[0047] The piston 6 is provided with an oil return hole F21, which is located on the side wall of the second mounting hole 9, and the oil return chamber M is connected to the second mounting hole 9 through the oil return hole F21.

[0048] In this embodiment, the auxiliary mechanism includes a second screw hole 22 and a third mounting hole 23 coaxially arranged. An oil return groove 24 is provided between the second screw hole 22 and the third mounting hole 23. The other end of the oil return hole A16 communicates with the third mounting hole 23. A second spring seat 25 is provided at the bottom of the third mounting hole 23, and a spring B26 is connected to the second spring seat 25. An oil suction nozzle 27 is connected to the second screw hole 22. The end of the oil suction nozzle 27 adjacent to the second screw hole 22 has a tapered sealing surface B28. A valve B29 that mates with the sealing surface B28 is provided at the upper end of the oil suction nozzle 27. A sixth sealing groove 231 is annularly provided on the wall of the third mounting hole 23. A sixth sealing ring 232 is provided in the sealing groove 231 to achieve a sealing fit between the outer wall of the valve B29 and the inner wall of the third mounting hole 23. The other end of the spring B26 is connected to the valve B29. The oil suction nozzle 27 is provided with an oil return hole G30 in the radial direction. The outside of the oil return hole G30 is connected to the oil return groove 24, and the inside of the oil return hole G30 is connected to the oil suction hole on the oil suction nozzle 27. The oil return groove 24 is connected to the other end of the oil return hole E20. The lower end of the oil suction nozzle 27 is connected to the oil tank. A seventh sealing groove 271 is provided on the outer wall of the oil suction nozzle 27. A seventh sealing ring 272 is installed in the seventh sealing groove 271 to achieve a sealing fit between the oil suction nozzle 27 and the second screw hole 22.

[0049] In this embodiment, the operating mechanism includes two mounting seats 31 disposed on the upper end of the support 7. The two mounting seats 31 are symmetrically arranged in a front-to-back direction. A cam 33 is connected to the left side of the two mounting seats 31 via a transition shaft 32. The cam 33 is located between the two mounting seats 31. Both the cam 33 and the mounting seats 31 are provided with weight-reducing holes. Specifically, the mounting seats 31 are provided with seat holes 311, and the cam 33 is provided with cam holes 331. The cam 33 is connected to the seat holes 311 and the cam holes 331 via the transition shaft 32, so that the cam 33 can rotate. Each adjacent side of the two mounting seats 31 is provided with a sliding groove 34 with the transition shaft 32 as the rotation center. The cam 33 is connected with a component that cooperates with the sliding groove 34. The rocker arm mechanism has a locking function when the cam 33 rotates to a predetermined angle. The cam 33 is provided with an arc groove 37 formed by cam surface A35 and cam surface B36. The support 7 is provided with a through hole 38 for the piston 6 to pass through. The piston 6 located at the upper end of the through hole 38 is provided with a pin mounting hole 391. A pin 39 is installed on the pin mounting hole 391. The front and rear ends of the pin 39 are located in the arc groove 37 formed by cam surface A35 and cam surface B36. The through hole 38 is provided with an eighth sealing groove 381 in annular shape. An eighth sealing ring 382 is provided in the eighth sealing groove 381 so that the piston 6 and the through hole 38 can achieve a sealing fit.

[0050] In this embodiment, the rocker arm mechanism includes a rocker arm 40. The rocker arm 40 has a third screw hole 41, a guide hole 42, and a limiting hole 43 arranged sequentially along its axial direction. A locking rod 44 is provided on the guide hole 42 and the limiting hole 43. The locking rod 44 sequentially includes a guide shaft 45 slidably connected to the guide hole 42 and a limiting shaft 46 slidably connected to the limiting hole 43. One end of the limiting shaft 46 extends a predetermined distance outside the limiting hole 43. A push shaft 47 connects the guide shaft 45 and the limiting shaft 46. A spring positioning shaft 48 is provided at the end of the locking rod 44 adjacent to the cam 33. A stud 49 is provided on the cam 33. A fixing hole 50 opening towards one side of the sliding groove 34 is provided inside the stud 49. The rocker arm 40 is connected to the stud 49 through the third screw hole 41. A spring C51 is connected to the bottom of the fixing hole 50, and the other end of the spring C51 is connected to the spring positioning shaft 48.

[0051] The guide hole 42 has a through-hole 52 on its wall, and the guide shaft 45 has a locking pin hole 53 in the radial direction. A locking pin 54 is installed on the locking pin hole 53, and the front and rear ends of the locking pin 54 pass through the through-hole 52 and extend into the sliding groove 34.

[0052] The sliding groove 34 has a brake release locking groove 55 and a brake locking groove 56 at its two ends, respectively, and the brake release locking groove 55 and the brake locking groove 56 are arranged in the radial direction. The system converts the rotation of the rocker arm into the linear motion of the piston through the cam, so that the hydraulic pressure in the working chamber is established and eliminated. When the rocker arm is manually rotated, the cam rotates around the transition shaft. The cam profile A and cam profile B of the cam rotate around the transition shaft, and the force is transmitted to the piston through the pin 39, pushing or pulling the piston to move down or up.

[0053] Specifically, the radius of rotation of the rocker arm 40 is greater than the distance from the axis of the piston 6 to the axis of the adapter shaft 32, so that a higher braking pressure can be obtained by applying a smaller operating force.

[0054] Specifically, the perpendicular distance from the normal of each point on the cam surface A35 and cam surface B36 of the cam 33 to the axis of the adapter shaft 32 is equal. During the linear movement of the piston, its axis coincides with the normal of each point on the cam surface A35 and cam surface B36. After the operating force is transmitted to the piston, no radial component force is generated, which improves the force transmission efficiency and avoids jamming.

[0055] Specifically, one end of the limiting shaft 46 extends out of the limiting hole 43 and has a smooth spherical surface 57 to facilitate operation.

[0056] When the brake needs to be released, hold the rocker arm 40 and press the smooth spherical surface 57 of the locking lever 44 to unlock it. Rotate the rocker arm 40 counterclockwise to pull the piston 6 upward, increasing the volume of the working chamber N and reducing the brake pressure. When the rocker arm 40 rotates to the brake release position, it automatically locks. That is, when the rocker arm 40 rotates to the brake release locking groove 55 position, it achieves self-locking under the action of the spring C51, and the working chamber pressure drops to 0MPa, thus releasing the brake. At the same time, the volume of the oil return chamber M decreases, and the oil returns to the oil tank from the oil return hole B17 of the actuator, the oil return hole D19 of the housing 1, the oil return hole C18, the oil return hole E20, the oil return groove 24, and the oil suction hole of the oil suction nozzle 27.

[0057] When braking is required, hold the rocker arm 40 and press the smooth spherical surface 57 of the locking lever 44 to unlock. Rotate the rocker arm 40 clockwise to push the piston 6 down, reduce the volume of the working chamber N, and increase the pressure. When the rocker arm 40 rotates to the braking position, it automatically locks. That is, when the rocker arm 40 rotates to the position of the brake locking groove 56, it achieves self-locking under the action of the spring C51. The pressure in the working chamber N rises to the specified braking pressure to achieve braking.

[0058] At the same time, the volume of the oil return chamber M increases, and oil is drawn from the oil tank through the oil return hole B17 of the actuator cylinder 5, the oil return hole D19 of the housing 1, the oil return hole C18, the oil return hole E20, the oil return groove 24 and the oil suction hole of the oil suction nozzle 27 to replenish the oil, as shown in Figure 3 (brake state).

[0059] When the brake pressure is too high, i.e., the pressure in the working chamber N is too great, the spring A11 is compressed, and the pressure pushes the valve A15 upward, so that the lower end face of the valve A15 is in communication with the sealing surface A14. This allows the oil to flow back to the oil tank through the first oil hole 13, return oil hole F21, return oil hole B17, return oil hole D19, return oil hole C18, return oil hole E20, return oil groove 24 and the suction hole of the suction nozzle 27 on the first valve seat 12, thereby reducing the pressure and ensuring that the brake pressure meets the specified pressure value. When the brake pressure drops to the specified brake pressure, the spring A11 returns to its original position and pushes the valve A15 downward, so that the lower end face of the valve A15 is in a sealing state with the sealing surface A14, ensuring that the brake pressure meets the requirements.

[0060] When releasing the brake, rotating the rocker arm 40 counterclockwise pulls the piston 6 upward, increasing the volume of the working chamber N and drawing back the oil from the rotor brake device to relieve braking pressure. When the amount of oil drawn back from the rotor brake device is insufficient to fill the working chamber N, a negative pressure is generated in the working chamber N. At this time, the spring B26 is compressed, and the valve B29 moves upward, causing a gap to form between the lower end face of the valve B29 and the sealing surface B28 of the upper end face of the suction nozzle 27. This allows oil to be drawn from the oil tank through the suction nozzle 27 and the return oil hole A16 for replenishment. When braking, rotating the rocker arm clockwise pushes the piston downward. The sealing surface B28 of the lower end face of the valve B29 and the upper end face of the suction nozzle 27 is closed, reducing the volume of the working chamber N. Oil is then output from the outlet nozzle 4 to the rotor brake device, building pressure for rotor braking.

[0061] In summary, the manual passive hydraulic brake control device for braking provided by this invention is designed according to actual needs, simplifying the rotor braking system, reducing the overall weight of the helicopter, and improving its comprehensive performance. It has good practicality and usability, and is easy to promote and apply. Furthermore, this invention can adjust the oil flow according to the pressure status of the return oil chamber and the working chamber. When the oil in the rotor brake device's internal cavity is insufficient, an auxiliary mechanism allows oil from the tank to flow back to the working chamber as a supplement. Simultaneously, when the pressure in the working chamber exceeds a predetermined value, an auxiliary mechanism allows oil in the working chamber to be output to the tank for pressure relief. The rocker arm mechanism enables brake release locking and brake locking functions, preventing accidental brake release or switching due to misoperation, thus preventing accidents and improving operational safety.

[0062] This manual passive hydraulic brake control device is suitable for providing braking pressure to rotor brakes in the absence of a hydraulic power source, and is also suitable for other occasions that require hydraulic pressure.

[0063] 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 manual passive hydraulic brake operating device for braking, comprising an operating mechanism and an actuating mechanism, characterized in that: The output end of the control mechanism is connected to the input end of the actuation mechanism. The output end of the actuation mechanism is connected to the inner cavity of the rotor brake device and the auxiliary mechanism, respectively. The output end of the auxiliary mechanism is connected to the oil tank. The actuation mechanism has a working chamber (N) and a return oil chamber (M). The working chamber (N) and the return oil chamber (M) are connected through the auxiliary mechanism, and the return oil chamber (M) is connected to the oil tank. When braking is required, the control mechanism is manually driven, which drives the actuation mechanism. Pressure is built up in the working chamber (N), and the pressure is output to the inner cavity of the rotor brake device to drive the rotor brake device to brake. When the output pressure of the working chamber (N) exceeds a predetermined value, the pressure is reduced by the auxiliary mechanism to maintain operation. The working chamber (N) is set with a specified braking pressure. When the output pressure of the working chamber (N) is lower than the predetermined value, the auxiliary mechanism blocks the passage between the working chamber and the oil tank to maintain the braking pressure. When it is necessary to release the brake, the manual reverse drive mechanism is used to drive the actuation mechanism back to its original position, thereby eliminating the pressure in the working chamber (N) and releasing the rotor brake. When the pressure in the working chamber (N) and the return oil chamber (M) forms a negative pressure, the auxiliary mechanism draws oil from the oil tank to replenish the oil. The actuation mechanism includes a housing (1), which has a first mounting hole (2) with an opening at the top. An oil outlet hole (3) is provided at the bottom of the first mounting hole (2), and the lower end of the oil outlet hole (3) extends through the housing. Outside the body (1), the lower end of the oil outlet (3) is connected to the inner cavity of the rotor brake device through the oil outlet nozzle (4). An actuator (5) is installed in the first mounting hole (2), and a piston (6) is provided inside the actuator (5). A support (7) is connected to the upper end of the housing (1). An operating mechanism is connected to the upper end of the piston (6) through the support (7). The operating mechanism is set on the support (7). A stepped shaft hole is provided inside the lower end of the piston (6). The stepped shaft hole includes a first screw hole (8) and a second mounting hole (9) from bottom to top. A first spring seat (10) is provided at the bottom of the second mounting hole (9). A spring A (11) is connected to the seat (10), and a first valve seat (12) is connected to the first screw hole (8). The first valve seat (12) has a first oil hole (13) that runs vertically through the first oil hole (13). The upper end of the first oil hole (13) has a sealing surface A (14) with a conical cross section. The upper end of the first valve seat (12) is provided with a valve A (15) that mates with the sealing surface A (14). The other end of the spring A (11) is connected to the valve A (15). The matching arrangement of the piston (6), the first valve seat (12) and the valve A (15) divides the actuating cylinder (5) into an upper and lower oil return chamber (M) and a working chamber (N).The auxiliary mechanism is located inside the housing (1) on one side of the oil outlet (3). The housing (1) is provided with an oil return hole A (16). One end of the oil return hole A (16) is connected to the oil outlet (3), and the other end is connected to the upper end of the auxiliary mechanism. An oil return hole B (17) is provided on the upper side wall of the actuating cylinder (5). An oil return hole C (18) is provided inside the housing (1) along the vertical direction. The upper end of the oil return hole C (18) is connected to the oil return hole B (17) via an oil return hole D (19) on the housing (1). 17) Connected, the lower end of the oil return hole C (18) is connected to the lower end of the auxiliary mechanism through the oil return hole E (20); the auxiliary mechanism includes a second screw hole (22) and a third mounting hole (23) coaxially arranged, an oil return groove (24) is provided between the second screw hole (22) and the third mounting hole (23), the other end of the oil return hole A (16) is connected to the third mounting hole (23), and a second spring seat (25) is provided at the bottom of the third mounting hole (23). 25) A spring B (26) is connected to the upper part, and an oil suction nozzle (27) is connected to the second screw hole (22). The oil suction nozzle (27) has a sealing surface B (28) with a conical cross section at one end adjacent to the second screw hole (22). A valve B (29) that mates with the sealing surface B (28) is provided at the upper end of the oil suction nozzle (27). The other end of the spring B (26) is connected to the valve B (29). An oil return hole G (30) is provided in the radial direction of the oil suction nozzle (27). The oil return hole G (30) is externally connected to the oil return groove (24), and the inside of the oil return hole G (30) is connected to the oil suction hole on the oil suction nozzle (27). The oil return groove (24) is connected to the other end of the oil return hole E (20), and the lower end of the oil suction nozzle (27) is connected to the oil tank. The piston (6) is provided with an oil return hole F (21), which is located on the side wall of the second mounting hole (9), and the oil return chamber (M) is connected to the second mounting hole (9) through the oil return hole F (21).

2. The manual passive hydraulic brake operating device for braking according to claim 1, characterized in that: The operating mechanism includes two mounting seats (31) disposed on the upper end of the support (7). The two mounting seats (31) are symmetrically arranged in the left-right direction. A cam (33) is connected between the two mounting seats (31) on the left side via a transition shaft (32). The cam (33) is located between the two mounting seats (31). Each adjacent side of the two mounting seats (31) is provided with a sliding groove (34) with the transition shaft (32) as the rotation center. A rocker arm mechanism that cooperates with the sliding groove (34) is connected to the cam (33). The rocker arm mechanism has the function of making the cam (33) The function of locking when rotating at a predetermined angle is provided. The cam (33) is provided with an arc groove (37) formed by cam surface A (35) and cam surface B (36). The support (7) is provided with a through hole (38) for the piston (6) to pass through. The piston (6) located at the upper end of the through hole (38) is provided with a pin mounting hole (391). A pin (39) is installed on the pin mounting hole (391). The front and rear ends of the pin (39) are located in the arc groove (37) formed by cam surface A (35) and cam surface B (36).

3. The manual passive hydraulic brake operating device for braking according to claim 2, characterized in that: The rocker arm mechanism includes a rocker arm (40). A third screw hole (41), a guide hole (42), and a limiting hole (43) are sequentially arranged along the axial direction inside the rocker arm (40). A locking rod (44) is provided on the guide hole (42) and the limiting hole (43). The locking rod (44) sequentially includes a guide shaft (45) slidably connected to the guide hole (42) and a limiting shaft (46) slidably connected to the limiting hole (43). One end of the limiting shaft (46) extends a predetermined distance outside the limiting hole (43). A push shaft (47) connects the guide shaft (45) and the limiting shaft (46). A spring positioning shaft (48) is provided at the end of the locking rod (44) adjacent to the cam (33). A stud (49) is provided on the cam (33). A sliding groove (3) is provided inside the stud (49). 4) A fixed hole (50) with an opening on one side, the rocker arm (40) is connected to the stud (49) through the third screw hole (41), the bottom of the fixed hole (50) is connected to a spring C (51), and the other end of the spring C (51) is connected to the spring positioning shaft (48); the guide hole (42) is provided with a waist-shaped hole (52) that runs through the front and back, the guide shaft (45) is provided with a locking pin hole (53) in the radial direction, a locking pin (54) is installed on the locking pin hole (53), and the front and rear ends of the locking pin (54) respectively pass through the waist-shaped hole (52) and extend into the sliding groove (34); the two ends of the sliding groove (34) are respectively provided with a brake release locking groove (55) and a brake locking groove (56), and the brake release locking groove (55) and the brake locking groove (56) are arranged in the radial direction.

4. The manual passive hydraulic brake operating device for braking according to claim 3, characterized in that: The radius of rotation of the rocker arm (40) is greater than the distance from the axis of the piston (6) to the axis of the adapter shaft (32).

5. The manual passive hydraulic brake operating device for braking according to claim 2, characterized in that: The perpendicular distance from the normal of each point on the cam surface A (35) and cam surface B (36) of the cam (33) to the axis of the adapter shaft (32) is equal.

6. The manual passive hydraulic brake operating device for braking according to claim 3, characterized in that: One end of the limiting shaft (46) extends to the outside of the limiting hole (43) and has a smooth spherical surface (57).

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