Brake pressure stabilizing device and method

Abstract

The invention provides a brake pressure stabilizing device and method, and the device comprises a fixed support which is arranged on the floor of an aircraft cockpit; one end of the first adjusting pull rod is arranged on the fixed support; one end of the second adjusting pull rod is arranged on the fixed support; one end of the connecting plate is connected with the other end of the first adjusting pull rod, and the other end of the connecting plate is connected with the other end of the second adjusting pull rod; one end of the bent connector is connected with the middle part of the connecting plate; the pedal fixing device is arranged at the other end of the bent connector, and the pedal fixing device can be attached to the upper portion of a brake pedal; the pressure sensor is used for collecting brake pressure and transmitting the brake pressure to the first adjusting pull rod and the second adjusting pull rod.

Description

Technical Field

[0001] The present application belongs to the field of aviation technology aircraft assembly and adjustment technology, and in particular, relates to a brake pressure stabilization device and method. Background Art

[0002] During the ground joint test of the aircraft hydraulic system, the interpretation of the brake system test pressure is a great challenge for ground test personnel. According to the top-level requirements, it is necessary to check the limit value of the hydraulic system brake pressure, press the brake pedal to the limit position, and observe whether the system pressure is stable and whether there is any pressure increase or decrease. The left and right driving need to be checked separately.

[0003] During this process, the foot pedal needs to be pressed continuously for a long period of time, which requires a lot of physical strength from the experimenter. In addition, when conducting the series braking test, the left-hand brake pedal needs to be pressed halfway and the right-hand brake pedal needs to be pressed to the bottom. At this time, check whether the brake pressure meets the requirements, then release the right-hand brake pedal to observe whether the left-hand brake pressure meets the requirements, and then change to the right-hand brake pedal and press halfway to repeat the above work. During the experiment, the operator relies on the feel of the foot to stabilize the pressure, and the pressure cannot be stabilized, resulting in the need to repeat this experiment due to the pressure jump problem. Summary of the invention

[0004] Purpose of the invention: The present application aims to solve the problems of unstable pressure and low efficiency during ground testing of hydraulic brake systems.

[0005] In a first aspect, the present application provides a brake pressure stabilizing device, the device comprising:

[0006] A fixed support, arranged on the floor of the aircraft cockpit;

[0007] A first adjusting rod, one end of which is disposed on the fixed support;

[0008] a second adjusting rod, one end of which is disposed on the fixed support;

[0009] a connecting plate, one end of which is connected to the other end of the first adjusting rod, and the other end of which is connected to the other end of the second adjusting rod;

[0010] An elbow joint, one end of which is connected to the middle of the connecting plate;

[0011] A pedal fixing device is arranged at the other end of the bent joint, and the pedal fixing device can fit with the upper part of the brake pedal;

[0012] A pressure sensor, used for collecting brake pressure and transmitting the brake pressure to the first adjusting rod and the second adjusting rod;

[0013] Wherein, the first adjusting rod and the second adjusting rod are used to adjust the angle and position of the pedal fixing device based on the brake pressure.

[0014] Preferably, the device further comprises:

[0015] A bracket, disposed on the floor of the aircraft cockpit;

[0016] A limit block is arranged at one end of the bracket, and the limit block can abut against the end surface of the aircraft cockpit floor;

[0017] A fixed support, one end of which is connected to the other end of the bracket, and the other end of the fixed support is provided with a bending portion, which can abut against the lower part of the brake pedal; wherein the bending portion and the limit block are used for positioning.

[0018] Preferably, two bases are further provided on the fixed support, and the bases are used to install the first adjusting rod and the second adjusting rod.

[0019] Preferably, one end of the bent joint is connected to the connecting plate, and the other end is connected to the pedal fixing device, adopting an L-shaped design, whose opening matches the driver's driving pedal and is used to limit the upper part of the foot pedal.

[0020] Preferably, the pedal fixing device fits with the upper part of the footrest pedal on the machine and is fixed to the connecting plate using a fisheye bearing connection method, ensuring that it can rotate flexibly and adjust the angle freely, thereby avoiding the problem of the device being unable to be fixed due to changes in the upper position of the footrest caused by differences in the footrest assembly.

[0021] Preferably, the first adjustment rod is identical to the second adjustment rod.

[0022] Preferably, a feedback mechanism and a limit mechanism are designed inside the first adjusting rod. The sensor collects the real-time brake pressure value. When the brake pressure reaches a specified range, the signal is input into the feedback mechanism. At this time, the feedback mechanism transmits the signal to the limit device inside the adjusting rod to lock the driver's foot pedal to ensure the stability of the brake pressure value.

[0023] In a second aspect, the present application further provides a brake pressure stabilization method, the method comprising:

[0024] Step 1. Remove the limit block, push the fixed support and bracket to the bottom of the foot brake pedal, and fit the L end of the fixed support to the bottom edge of the pedal;

[0025] Step 2: Move the limit block forward and backward to firmly fix the bracket base on the driver's floor;

[0026] Step 3: During the normal brake test, the driver's pedal is pressed to the bottom and the sensor is set to the maximum pressure mode. At this time, the pressure signal is fed back to the adjustment lever feedback mechanism so that the pedal fixing device clamps the upper edge of the driver's pedal and fits tightly with the pedal;

[0027] Step 4: Release the pedal, and use the clamp to hold the driver's brake pedal at the limit position. At this time, observe and record the brake pressure on the aircraft;

[0028] Step 5: When conducting a series brake test, two sets of the same fixtures are required. Now press the main driver's pedal halfway, use the fixture to limit the position, set the sensor to the series brake mode, press the co-pilot's pedal to the bottom, and then use another set of fixtures to limit the position;

[0029] Step 6. After the test, loosen the pedal fixture by turning the adjustment rod, unscrew the limit block, and remove the clamp from the front end.

[0030] Beneficial technical effects of this application:

[0031] The application has low installation cost, simple equipment, simplified operation, convenient use, high installation efficiency, and greatly reduces the labor intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a brake pressure stabilizing device provided in an embodiment of the present application;

[0033] Among them, 1-fixed support, 2-pedal fixing device, 3-adjusting rod, 4-bracket, 5-limiting block, 6-bend joint, 7-connecting plate. DETAILED DESCRIPTION

[0034] See also Figure 1 The present invention provides a method for stabilizing the brake pressure of a hydraulic system. A chassis with a fixed support and a bracket is assembled on a machine and installed under a brake pedal. The chassis is fixed to the driver's floor with a limit block. An adjusting rod is installed on the support. The pedal movement trajectory and pitch angle during braking are analyzed to form a stable triangular frame of the bracket, pedal, and adjustable knob rod. By adjusting the length of the adjustable rod, the side margin is shortened and changed to drive the upper end of the pedal to move in a fan shape along the pedal tube axis to maintain a constant low-pressure braking force value. The pedal fixing device is adapted to the movable pedal on the pedal.

[0035] This method comprises the following steps:

[0036] Step 1: Slowly push the fixed support from the back of the heading until the L-shaped edge at the rear end of the support contacts the lower part of the driver's foot pedal. At this time, remove the limit block, place the bracket on the cockpit floor from the front end of the heading, push it backward until it fits with the fixed support, and connect the bracket to the fixed support with the corresponding bolts and nuts. The bracket and the fixed support are connected by precision holes and reaming holes to avoid fluctuations in the measured brake pressure value due to external factors such as aircraft vibration;

[0037] Step 2: Gently pull the bracket toward the front end of the heading to make the fixed support fit with the lower part of the driver's foot pedal, adjust the position of the movable limit block to make the limit block fit with the front edge of the driver's floor, and ensure that the device cannot move forward or backward after being fixed; the limit block and the bracket are connected in the form of a toothed plate, which is convenient for moving forward and backward to adjust the position, and it has a mechanical lock and can be stopped at any position. Rubber material is pasted on the rear of the limit block where it fits with the driver's floor to prevent the device from scratching the floor surface during the fixing process;

[0038] Step 3: After the fixed support on the aircraft is connected to the bracket, insert the adjustment rod 1 and the adjustment rod 2 from the front of the heading and fix them on the fixed support with the corresponding bolts and nuts;

[0039] Step 4: Connect and fix the pedal fixing device to the connecting plate with the bent joint on the ground, and then fix the connecting plate to the two adjusting rods on the machine. At this time, the upper part of the driver's foot pedal is firmly fixed by adjusting the length of the adjusting rod and rotating the pedal fixing device;

[0040] Step 5: During the normal brake test, the ground test bench supplies pressure to the aircraft to meet the normal demand of the brake system's working hydraulic source. The sensor on the bracket is set to the normal brake mode. In this mode, the driver's pedal is pressed to the bottom. At this time, the brake system has the maximum brake pressure. After the sensor on the bracket collects the pressure signal, it transmits the pressure signal to the feedback device of the adjustment rod. The feedback device receives the signal control and locks the adjustment rod. At this time, the adjustment rod automatically fixes the position of the driver's pedal to ensure that the brake system pressure value is stable and unchanged.

[0041] Step 6: The tester releases the pedal. The clamp holds the driver's brake pedal at the limit position. Observe and record the brake pressure on the aircraft. After recording, set the sensor to normal mode. The feedback mechanism no longer performs the braking function. The pedal can be released. The pedal returns to the starting position and the brake pressure value is zero.

[0042] Step 7. When conducting a series brake test, two sets of the same fixtures are required. Set the sensor on the bracket of the driver's driver's pressure stabilizer to the series brake mode. In this mode, press the driver's pedal halfway. At this time, the brake pressure value of the brake system is the rated value of the technical indicator. After the sensor on the bracket collects the pressure signal, it transmits the pressure signal to the feedback device of the adjustment rod. The feedback device receives the signal control and locks the adjustment rod. At this time, the adjustment rod automatically fixes the position of the driver's foot pedal; set the sensor on the bracket of the passenger driver's driver's pressure stabilizer to the normal brake mode, press the passenger driver's pedal to the bottom, and the pressure value of the passenger's brake system is the maximum brake pressure of the system. The sensor on the bracket After the pressure signal is collected, the pressure signal is transmitted to the feedback device of the adjustment rod. The feedback device receives the signal to control and lock the adjustment rod. At this time, the adjustment rod automatically fixes the position of the co-pilot driver's pedal. Due to the particularity of the series brake test, the co-pilot needs to step on the pedal halfway and the driver's pedal to the bottom for the test. Therefore, the sensor on the bracket is set to the normal braking mode for the driver's seat and the series brake mode for the co-pilot, and the above steps are repeated. After checking and recording the test data, the series brake test pressure check is completed. At this time, the sensors of the driver's seat and the co-pilot are set to the normal mode. At this time, the feedback mechanisms of the two sets of devices no longer brake, and the brake pedals of the drivers on both sides return to the starting position.

[0043] Step 8. After the brake test is completed, loosen the pedal fixing device by turning the adjusting rod, unscrew the limit block, disconnect the connection point between the adjusting rod and the fixed support, and disconnect the connection point between the bracket and the fixed support. Move the bracket and the adjusting rod from the front end of the heading, move the fixed support from the rear end of the heading, place them in a special placement box for the device, and take protective measures.

[0044] Furthermore, the bracket is in the shape of a Chinese character “U” and is made of stainless steel. The shape is not easily deformed, and the corresponding sharp edges are chamfered with R5 to prevent personal injury during placement and use. The middle is hollowed out to reduce weight and the labor intensity of the operator.

[0045] Furthermore, the connecting ends of the adjusting rod and the fixed support as well as the pedal fixing device and the connecting plate are connected in the form of fisheye bearings, so that they can rotate flexibly in the adjustment position, and a grease nipple is provided for lubricating the above-mentioned joints to facilitate later maintenance. The standard parts used are all general navigation products, and the nuts are standard parts with cotter pin holes. After fixing, the cotter pins are opened according to HB requirements to prevent the connection parts of the device from loosening during use, which may cause a jump in the brake pressure value on the aircraft.

[0046] Furthermore, a rubber material is adhered to the inner surface of the front end of the fixed pedal to prevent the surface quality of the aircraft product from being damaged during the installation of the device on the aircraft.

[0047] Furthermore, the bent joint material needs to be in contact with the pedal and bear the force, so 30CrMnSi material is used. The shape adopts an L-shaped design to match the shape of the upper part of the pilot's foot pedal on the aircraft, and the height is moderate to avoid interference with the structure of the upper part of the foot pedal on the aircraft.

[0048] Furthermore, the connection between the bent joint and the connecting plate does not need to be repeatedly disassembled and assembled, and has a compact appearance and can be assembled as a whole on the ground. Therefore, the connection is in the form of welding, which is firmly fixed and not easy to loosen.

[0049] Furthermore, the brake pressure sensor on the bracket is connected in parallel with the onboard flight parameter signal, which can monitor the brake pressure of the hydraulic system in real time and set three gears: "normal braking mode", "series braking mode" and "normal mode". Among them, the normal braking mode mainly collects the maximum brake pressure of the hydraulic system, the series braking mode mainly collects the rated brake pressure when the driver's foot pedals halfway, and the normal mode sensor does not collect signals; after the brake pressure sensor collects the pressure signal, it transmits it to the feedback mechanism of the adjustment rod. The feedback mechanism controls the braking of the adjustment rod through signal processing, and controls it to lock or release the brake. The feedback mechanism receives the normal braking mode. At this time, braking is performed when the brake pressure reaches the maximum. In the series braking mode, braking is performed at the rated brake pressure when the driver's foot pedals halfway, and no braking is performed in the normal mode. Under this top-level logic, the operator or experimenter does not need to keep the pedal pressed for a long time. After the brake pressure reaches the set range, the locking brake is automatically performed to ensure the stability of the driver's foot pedal and the authenticity of the brake pressure value during the onboard experiment.

[0050] The present invention discloses a method for stabilizing brake pressure, which includes eight steps. Through a clamp, the driver's pedal is limited to achieve the stability and authenticity of the pressure during the ground brake system test, overcomes the problem that it is difficult to achieve a constant value by manpower when maintaining a large pedal torque in a long-term stable state, avoids the brake pressure fluctuation caused by the change of the pedal position, and provides a direction for subsequent brake system test troubleshooting. When the brake system fails, the problem of pedal stability can be eliminated. The method has simple tools, simplified steps, easy operation, and improved work efficiency.

Claims

1. A brake pressure stabilizing device, characterized in that: The device comprises: A fixed support, arranged on the floor of the aircraft cockpit; A first adjusting rod, one end of which is disposed on the fixed support; A second adjusting rod, one end of which is disposed on the fixed support; a connecting plate, one end of which is connected to the other end of the first adjusting rod, and the other end of which is connected to the other end of the second adjusting rod; An elbow joint, one end of which is connected to the middle of the connecting plate; A pedal fixing device is arranged at the other end of the bent joint, and the pedal fixing device can fit with the upper part of the brake pedal; A pressure sensor, used for collecting brake pressure and transmitting the brake pressure to the first adjusting rod and the second adjusting rod; Wherein, the first adjusting rod and the second adjusting rod are used to adjust the angle and position of the pedal fixing device based on the brake pressure.

2. The device according to claim 1, characterized in that The device also includes: A bracket, disposed on the floor of the aircraft cockpit; A limit block is arranged at one end of the bracket, and the limit block can abut against the end surface of the aircraft cockpit floor; A fixed support, one end of which is connected to the other end of the bracket, and the other end of the fixed support is provided with a bending portion, which can abut against the lower part of the brake pedal; wherein the bending portion and the limit block are used for positioning.

3. The device according to claim 2, characterized in that The fixed support is also provided with two bases, and the bases are used to install the first adjusting rod and the second adjusting rod.

4. The device according to claim 1, characterized in that One end of the bent joint is connected to the connecting plate, and the other end is connected to the pedal fixing device. It adopts an L-shaped design, and its opening matches the driver's driving pedal and is used for limiting the upper part of the foot pedal.

5. The device according to claim 1, characterized in that The pedal fixing device fits with the upper part of the footrest pedal on the machine and is fixed to the connecting plate by means of a fisheye bearing, thereby ensuring that it can rotate flexibly and adjust the angle freely, thereby avoiding the problem of the device being unable to be fixed due to changes in the upper position of the footrest caused by differences in footrest assembly.

6. The device according to claim 1, characterized in that The first adjusting rod is identical to the second adjusting rod.

7. The device according to claim 6, characterized in that A feedback mechanism and a limit mechanism are designed inside the first adjusting rod. The sensor collects the real-time brake pressure value. When the brake pressure reaches a specified range, the signal is input into the feedback mechanism. At this time, the feedback mechanism transmits the signal to the limit device inside the adjusting rod to lock the driver's foot pedal to ensure the stability of the brake pressure value.

8. A brake pressure stabilization method, characterized in that: The method comprises: Step 1. Remove the limit block, push the fixed support and bracket to the bottom of the foot brake pedal, and fit the L end of the fixed support to the bottom edge of the pedal; Step 2: Move the limit block forward and backward to firmly fix the bracket base on the driver's floor; Step 3: During the normal brake test, the driver's pedal is pressed to the bottom and the sensor is set to the maximum pressure mode. At this time, the pressure signal is fed back to the adjustment lever feedback mechanism so that the pedal fixing device clamps the upper edge of the driver's pedal and fits tightly with the pedal; Step 4: Release the pedal, and use the clamp to hold the driver's brake pedal at the limit position. At this time, observe and record the brake pressure on the aircraft; Step 5: When conducting a series brake test, two sets of the same fixtures are required. Now press the main driver's pedal halfway, use the fixture to limit the position, set the sensor to the series brake mode, press the co-pilot's pedal to the bottom, and then use another set of fixtures to limit the position; Step 6. After the test, loosen the pedal fixture by turning the adjustment rod, unscrew the limit block, and remove the clamp from the front end.

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