CN111348018B - Brake instruction sensor interface assembly and design method thereof - Google Patents
Brake instruction sensor interface assembly and design method thereof Download PDFInfo
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- CN111348018B CN111348018B CN202010276458.5A CN202010276458A CN111348018B CN 111348018 B CN111348018 B CN 111348018B CN 202010276458 A CN202010276458 A CN 202010276458A CN 111348018 B CN111348018 B CN 111348018B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface
- B64C25/42—Arrangement or adaptation of brakes
- B64C25/44—Actuating mechanisms
- B64C25/46—Brake regulators for preventing skidding or aircraft somersaulting
Abstract
A brake command sensor interface assembly and a design method thereof. The circumference of the outer end of the push rod is provided with steel balls which are in rolling fit with the inner surface of the movable bracket. One end of the movable support is sleeved on the outer circumferential surface of the outer end of the push rod. The movable support is in clearance fit connection with the push rod through a shaft hole; and a reset spring is arranged in the inner hole of the push rod. A gap of 2-2.5 mm is arranged between the inner end face of the movable support and the adjacent end face of the push rod. The movable support is fastened with the push rod through the ball screw. The utility model is stressed and compressed when in work, when the joint bearing and the rotating structure are subjected to lateral force, the joint bearing and the rotating structure can fully release redundant lateral force, and the stress of the brake command sensor is ensured to be along the axial direction, so that the working reliability is improved, the problem of the push rod fracture of the command sensor can be solved, the failure rate of the command sensor can be reduced by 50%, and the service life of the brake command sensor is prolonged.
Description
Technical Field
The utility model relates to the field of aircraft braking systems, in particular to an interface component of a braking instruction sensor for an aircraft and a design method thereof.
Background
The brake instruction sensor is one of important accessories in the electronic anti-skid brake system of the aircraft, the movable end of the brake instruction sensor is hinged with the movable end of the pedal, and the fixed end of the brake instruction sensor is hinged with the fixed end of the pedal. When the brake control device works, a driver presses a pedal, the pedal drives the movable end of the brake command sensor to move, and the brake command sensor outputs a voltage signal proportional to the displacement of the brake command sensor. The brake command sensor provides the voltage signal to the anti-skid control box, and the anti-skid control box outputs a corresponding brake pressure control signal according to the voltage signal. But because the foot pedal moves in an arc, the brake command sensor moves in a straight line. Therefore, a lateral force exists in the working process of the brake command sensor, and although the knuckle bearing at the moving end of the brake command sensor can offset a part of the lateral force, the knuckle bearing can only act in a small range, the lateral force cannot be completely eliminated, and the influence still exists. The side force is directly applied to the movable end interface component of the brake command sensor, and is applied to the internal working part of the brake command sensor, after the brake command sensor works for a long time, abnormal friction damage can occur to the part of the inner cavity, finally, the movable end is inflexible in work and even is jammed, and the normal work of the brake command sensor is affected. The interface component of the brake instruction sensor for the pedal only uses the knuckle bearing to eliminate the lateral force during the work, the reliability is low, and the hidden trouble of clamping stagnation deformation exists in the mechanical interface component during the actual use, thereby causing the abnormal performance of the product; the drawbacks of such interface assemblies are more pronounced, especially after prolonged use of the product.
The brake command sensor has the following problems that firstly, the brake command sensor does not generally move linearly but moves in an arc similar to the linear motion when in actual use, and the lateral force of a product is easy; secondly, a locating pin is adopted to fix the movable end bracket, and because the locating pin actually moves in an arc shape during working, the stress direction of the locating pin is not along the axial direction of a product, and deformation and even fracture are easy to occur; thirdly, adopt movable support, locating pin cooperation to realize mechanical idle running design, when the locating pin appears deformation, mechanical idle running index can't guarantee.
In search, the utility model patent with publication number CN204718618U discloses a dual redundancy anti-vibration brake command sensor, which has the following several drawbacks, firstly, the composition and structure of the movable end interface component of the brake command sensor can be affected by lateral force during operation, and the movable end is not designed to be rotatable to eliminate the lateral force. Second, this structure does not adopt rotary type structure, improves movable end interface subassembly intensity, guarantees that mechanical type idle running index is stable. Third, no active end interface component design method is proposed.
Disclosure of Invention
In order to overcome the defect of clamping stagnation of an interface component when a brake instruction sensor works in the prior art, the utility model provides the interface component of the brake instruction sensor and a design method thereof.
The interface component of the brake instruction sensor provided by the utility model comprises a movable bracket, a plurality of steel balls, ball screws, a push rod and a knuckle bearing; the steel balls are discharged in steel ball grooves formed in the circumferential surface of the outer end of the push rod. One end of the movable support is sleeved on the outer circumferential surface of the outer end of the push rod, and the surface of the steel ball is in rolling fit with the inner surface of the movable support. The movable support is fastened with the push rod through a ball screw. The movable support is in clearance fit connection with the push rod through a shaft hole; and a reset spring is arranged in an inner hole of the push rod. A gap of 2-2.5 mm is arranged between the inner end surface of the movable support and the adjacent end surface of the push rod,
the movable support is divided into a push rod connecting end and an interface end according to functions. The end surface of the inner end of the connecting end of the push rod is provided with a blind hole; the inner diameter of the blind hole is the same as the outer diameter of the push rod. An annular groove is formed in the inner circumference of the middle part of the blind hole, and the position of the groove corresponds to the steel ball groove on the push rod after assembly; inner diameter at the groove = push rod outer diameter + steel ball radius x 2. The shell of the connecting end of the push rod is provided with a mounting hole of a ball screw, and the mounting hole is communicated with the steel ball groove. The interface end is positioned on the end face of the connecting end of the push rod. The joint end is provided with a through hole for connecting the pedal joint bearing.
The outer diameter of the connecting end of the movable support push rod is 20mm, the inner diameter of the blind hole is 9.6mm, the inner diameter of the annular groove in the middle of the blind hole is 11.5-12 mm, and the axial width of the groove is 4.2mm; the center of the groove in the width direction is 3.5mm away from the end face of the connecting end of the push rod.
The ball screw is T-shaped. The length L of the ball screw is 2.9-3 mm. The diameter of the large-diameter end of the ball screw is 5mm, the length of the large-diameter end of the ball screw is 3mm, the small-diameter end of the ball screw is a connecting end, and the circumferential surface of the connecting end is a threaded surface. The end head of the connecting end is a hemispherical body which is contacted with the steel ball arranged in the annular groove, and the radius of the hemispherical body is 1mm.
An annular steel ball groove is formed in the outer circumferential surface of one end of the push rod. The outer diameter of the push rod is 9.5mm; the radius of the steel ball groove is 1.1-1.2 mm, and the center distance of the steel ball groove is 4.5mm from the end face of the end. Two rectangular positioning plates protruding radially are symmetrically distributed on the outer circumferential surface of the other end of the push rod, and radial grooves are formed in the outer ends of the positioning plates and used for guiding and positioning when the instruction sensor works.
The number of the steel balls is 13, and the diameter of the steel balls is 2mm.
The design process of the interface component of the brake instruction sensor provided by the utility model is as follows:
step one, determining an idle stroke of an interface component:
the idle stroke of the interface component is a movement gap reserved between the inner end surface of the blind hole of the movable support and the end surface of the adjacent push rod, so that the movement gap is required to be eliminated when the movable support is subjected to axial displacement by the acting force of the pedal. When the interface component moves, if the movement gap is not eliminated, the push rod does not generate displacement, and the output voltage of the brake instruction sensor is unchanged.
The movement gap is 2-2.5 mm, so that potential safety hazards caused by the error braking of the aircraft due to misoperation are prevented.
Step two, determining the movable range of the interface component:
the interface component activity range includes:
the interface component rotates 360 degrees around the axis of the interface component;
II, working stroke of the interface component; the working stroke of the interface component is axial displacement, the displacement distance is 15mm, and the interface component consists of an idle stroke of the interface component and an actual stroke of the interface component; the actual stroke of the interface component is the working stroke of the brake instruction sensor.
Offset between movable support and push rod in III interface assembly; in the working stroke of the interface component, the change of the included angle between the center line of the movable support and the center line of the push rod is not more than 14 degrees. In the process, the brake command sensor moves flexibly without clamping stagnation.
Step three, determining structural parameters of the interface component:
the inner diameter of the movable support of the interface component is in clearance fit with the outer diameter of the push rod.
I determining the diameter of the steel ball
Simulation mechanical analysis is carried out on the steel ball strength through ANASYS software, and the diameter of the steel ball is determined to be 2mm so as to meet the force bearing requirement of 1335N
II determining the size of a steel ball groove on the push rod
The arc radius of the steel ball groove on the push rod is 1.1-1.2 mm, and the center distance of the steel ball groove is 4.5mm from the end face of the push rod at the end of the steel ball groove.
III determining the size of the groove on the movable support
The inner diameter of the blind hole at the connecting end of the movable bracket push rod is 9.6mm; the inner diameter of the annular groove at the middle part of the blind hole is 11.5-12 mm, and the axial width of the groove is 4.2mm.
IV determining the number of steel balls
The number N of steel balls is calculated by the formula (1):
wherein: d (D) 1 The outer diameter of the push rod is 9.5mm, D 2 The diameter of the annular groove is d, the diameter of the steel ball is d, and the beta is a constant 1.02.
V determining structural parameters of ball screw
The length of the ball head screw is required to ensure that the circle center of the ball head and the circle center of the steel balls arranged in the push rod ring groove are positioned on the same circumference so as to ensure that the ball head screw is not influenced by lateral force along the tangential direction of the circular arc under the interaction force of the steel balls at two sides. The length L of the ball screw is 2.9-3 mm, and the radius of the ball is R1.
Through the steps, the design of the brake instruction sensor interface assembly is completed.
The braking instruction sensor is stressed and compressed when in operation, and when the braking instruction sensor receives lateral force, the joint bearing and the rotating structure can fully release redundant lateral force under the combined acting force, so that the braking instruction sensor is ensured to be stressed along the axial direction, and the working reliability is improved.
The initial structural dimensions of the rotary interface assembly were verified by durability testing. And carrying out a contrast test on the critical dimension influencing the rotary interface assembly, wherein the critical parameters comprise: the size R of the annular groove on the outer circle of the push rod, the inner diameter size phi of the groove on the upper part of the movable bracket and the length size L of the ball screw. The test results are shown in Table 1 below.
TABLE 1 results of experiments at different sizes
Through the test, the utility model is verified to be flexible and free of clamping stagnation and adhesion feeling in the working process. The optimized structure size of the push rod is subjected to 12000 times of circulation at the normal temperature of 25 ℃, 4000 times of circulation at the low temperature of-55 ℃ and 4000 times of circulation at the high temperature of 70 ℃, and the test proves that the rotary interface component works flexibly without clamping stagnation; the rotary interface component is disassembled, and the parts are not abnormally worn; and the structural strength calculation is carried out through simulation, and the interface component structure cannot deform or break under the action of 1335N force.
The utility model provides a brake instruction sensor interface component and a design method thereof on the basis of analysis and demonstration, simulation calculation and experimental verification. The ball screw is of an end face spherical structure, the size of the ball is consistent with the size of the steel ball, the ball screw has a fixing effect, and on the other hand, the ball screw and the steel ball are always in spherical contact, so that contact clamping stagnation is prevented. The utility model can eliminate the problem of the push rod fracture of the command sensor, and can reduce the failure rate of the command sensor by 50 percent, thereby prolonging the service life of the brake command sensor.
Drawings
FIG. 1 is a schematic diagram of a prior art brake command sensor;
FIG. 2 is a schematic diagram of the structure of the present utility model;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic view of the structure of a ball screw;
FIG. 5 is a schematic view of the structure of the movable bracket;
FIG. 6 is a left side view of FIG. 5;
FIG. 7 is a top view of FIG. 5;
FIG. 8 is a schematic structural view of a push rod;
FIG. 9 is a cross-sectional view of FIG. 8;
fig. 10 is a right side view of fig. 8.
In the figure: 1. a movable bracket; 2. steel balls; 3. ball screw; 4. a push rod; 5. a knuckle bearing;
Detailed Description
The embodiment is a brake command sensor interface assembly, which comprises a movable bracket 1, steel balls 2, ball screws 3, a push rod 4 and a knuckle bearing 5.
The steel balls 2 have a plurality of balls and are discharged into steel ball grooves formed in the circumferential surface of the outer end of the push rod 4. One end of the movable support 1 is sleeved on the outer circumferential surface of the outer end of the push rod 4, and the surface of the steel ball 2 is in rolling fit with the inner surface of the movable support. The movable bracket 1 is fastened with the push rod 4 through the ball screw 3. The movable bracket 1 is connected with the push rod 4 through shaft hole clearance fit.
In this embodiment, the number of steel balls is 13.
The movable support 1 is divided into a push rod connecting end and an interface end according to functions. The end surface of the inner end of the connecting end of the push rod is provided with a blind hole; the inner diameter of the blind hole is the same as the outer diameter of the push rod 4. A circumferential annular groove is formed in the middle of the inner surface of the blind hole, and the position of the groove corresponds to the position of a steel ball groove on the push rod after assembly; inner diameter at the groove = push rod outer diameter + steel ball radius x 2. The shell of the connecting end of the push rod is provided with a mounting hole of the ball screw 3, and the mounting hole is communicated with the groove. The interface end of the movable support is positioned on the end face of the connecting end of the push rod and is a horizontal plate. The horizontal plate is provided with a through hole; a knuckle bearing 5 is mounted in the through hole, and is connected to the pedal via the knuckle bearing.
The number of steel balls in this embodiment is 13, and the diameter of the steel balls is 2mm. The outer diameter of the movable support 1 is 20mm, and the inner diameter is 9.6mm. The inner diameter of the groove on the movable bracket is 11.5-12 mm, and the axial width of the groove is 4.2mm; the center of the groove in the width direction is 3.5mm away from the end face of the connecting end of the push rod.
The ball screw 3 is T-shaped and is stepped. The length L of the ball screw is 2.9-3 mm. The diameter of the large-diameter end of the ball screw is 5mm, the length of the large-diameter end of the ball screw is 3mm, and the end face of the large-diameter end is provided with a process groove with the depth of 0.8mm and the width of 0.8 mm. The small-diameter end of the ball screw is a connecting end, and the circumferential surface of the connecting end is a threaded surface. The end head of the connecting end is a hemispherical body which is contacted with the steel ball arranged in the annular groove, and the radius of the hemispherical body is 1mm.
In the embodiment, the movable bracket is effectively positioned and rotated by the contact of the hemispherical end of the ball head screw and the steel balls, so that the steel ball head is prevented from falling out of the round hole of the movable bracket.
The push rod 4 is a hollow revolution body. A circumferential annular groove is formed in the outer circumferential surface of one end of the push rod for placing the steel ball 2. In the embodiment, the outer diameter of the push rod is 9.5mm; the radius of the annular groove is 1.1-1.2 mm, and the center distance of the annular groove is 4.5mm from the end face of the end where the center distance is located.
A radially protruding reinforcing boss is provided on the outer circumferential surface of the other end of the push rod. Two rectangular positioning plates protruding radially are symmetrically distributed on the outer circumferential surface of the boss, radial grooves are formed in the outer ends of the positioning plates, the grooves are used for guiding and positioning when the instruction sensor works, and the push rod 4 is prevented from rotating in the circumferential direction when the instruction sensor works.
The inner hole of the push rod is a stepped hole, wherein the inner hole at one end with the annular groove is a lightening hole, and the weight of the structure of the push rod is reduced; an inner hole at one end of the positioning plate is a spring mounting hole, and a return spring is mounted in the spring mounting hole. In this embodiment, the aperture of the lightening hole is 4mm, and the aperture of the spring mounting hole is 12mm.
A steel ball 2 is arranged between a movable support 1 and a push rod 4 in the interface assembly, so that 360-degree rotation can be realized between the movable support 1 and the push rod 4. When in work, the movable bracket 1 moves linearly along the push rod 4, and as the movement track of the movable bracket 1 is increased by an arc movement on the basis of the linear movement, an included angle is formed between the central line of the circumference of the gap connection between the movable bracket 1 and the outer end of the push rod 4 and the central line of the push rod 4, and the movement stroke of the movable bracket 1 is not more than 15mm; the included angle between the center line of the movable support and the center line of the push rod is not more than 14 degrees, and the movable support of the interface assembly and the push rod move flexibly without clamping stagnation;
to ensure that the strength of the interface assembly meets the operating requirements, the interface assembly must be able to withstand 1335N of force.
The embodiment also comprises a design method of the interface component of the brake instruction sensor.
Step one, determining an idle stroke structure of an interface component:
in order to eliminate misoperation of a pilot, the interface component of the instruction sensor has idle stroke characteristics in the structure, namely, after the interface component is assembled, a movement gap of 2-2.5 mm is reserved between the inner end surface of the inner diameter of the movable bracket and the left end surface of the push rod along the axial direction, and the movement gap is between the inner end surface of the inner diameter of the movable bracket and the left end surface of the push rod. When the movable support is subjected to axial displacement by acting force of the pedal, a reserved movement gap is eliminated, and when the interface assembly moves, before the movement gap reserved between the inner end surface of the inner diameter of the movable support and the left end surface of the push rod is not eliminated, the push rod does not displace, and the displacement signal of the internal sensor cannot generate an output voltage signal. The brake command sensor output voltage is thus unchanged.
In the embodiment, the movement gap between the movable support and the push rod is 2.2mm, so that potential safety hazards caused by the error braking of the aircraft due to misoperation are prevented.
Step two, determining the movable range of the interface component:
in actual use, the brake command sensor does not move linearly along the axial direction, and the brake command sensor is connected with the pedals through the knuckle bearing. The brake instruction sensor is hinged with the pedal to perform circular arc movement. The lateral force in the working process is released completely by means of the self-adjustment of the knuckle bearing. Since the radius of the foot pedal is far greater than the working displacement of the brake command sensor, the brake command sensor is approximately considered to be also performing linear motion. The brake command sensor performs linear motion along the axial direction and converts a displacement signal into a voltage signal. However, the adjustment angle of the knuckle bearing is smaller and is generally 7-9 degrees, so that when the lateral force is larger and large deflection is generated, the knuckle bearing is insufficient to overcome the lateral force, and the brake command sensor is easy to clamp.
The interface component activity range includes:
the interface component rotates 360 degrees around the axis of the interface component;
II, working stroke of the interface component; the working stroke of the interface component is axial displacement, the displacement distance is 15mm, and the interface component consists of an idle stroke of the interface component and an actual stroke of the interface component; the actual stroke of the interface component is the working stroke of the brake instruction sensor.
Offset between movable support and push rod in III interface assembly; in the working stroke of the interface component, the change of the included angle between the center line of the movable support and the center line of the push rod is not more than 14 degrees. In the process, the brake command sensor moves flexibly without clamping stagnation.
Step three, determining structural parameters of the interface component:
the clearance fit between the internal diameter of interface subassembly movable support and the external diameter of push rod, push rod external diameter is 9.5mm in this example, and the internal diameter of interface subassembly movable support is 9.6mm.
I determining the diameter of the steel ball
The diameter of the steel ball is large, and a movable bracket structure is increased; the diameter of the steel ball is small, and the positioning difference and the strength of the steel ball are low. And (3) carrying out simulation mechanical analysis on the steel ball strength by utilizing ANASYS software, wherein the diameter of the steel ball cannot be smaller than 1.6mm under the condition of meeting the bearing 1335N, otherwise, the steel ball can yield and deform, and the using effect is affected.
Because the pedal mechanism is reserved for a small installation space of the instruction sensor, the outer diameter of the movable support of the sensor is not larger than phi 25mm, meanwhile, the strength of the movable support must meet the requirement, the diameter of the steel ball is not larger than 2.5mm, and otherwise, the strength of the movable support is reduced.
In this example, the diameter of the steel ball is 2mm.
II determining the size of a steel ball groove on the push rod
In order to ensure that the steel ball with the diameter of 2mm is fully contacted with the push rod and realize effective positioning and rotation, the radius of a steel ball groove on the push rod is 1.1-1.2 mm, and the distance between the circle center of the steel ball groove and the end face of the push rod at the end is 4.5mm.
In the embodiment, the outer diameter of the push rod is 9.5mm, the radius of an annular groove on the push rod is 1.1mm, and the circle center of the steel ball groove is 4.5mm away from the end face of the push rod.
III determining the size of the groove on the movable support
In the embodiment, the inner diameter of the blind hole at the connecting end of the movable bracket push rod is 9.6mm; the inner diameter of the part of the blind hole, which is provided with a circumferential annular groove, is 11.5-12 mm, and the axial width of the groove is 4.2mm.
IV determining the number of steel balls
Because the steel balls are uniformly arranged in the annular groove on the push rod, the diameter of the steel balls is far smaller than the circumferential length of the annular groove, and the diameter of the steel balls can be approximately considered to be the same as the arc length of the annular groove occupied by a single steel ball. The number of steel balls is calculated by the following formula (1):
wherein: d (D) 1 The outer diameter of the push rod is 9.5mm, D 2 The diameter of the annular groove is 2.2mm, d is 2mm of the diameter of the steel ball, and beta is a constant 1.02.
Calculated n=14.5. During installation, ball screws are required to be added, and gaps are required to be reserved among the steel balls, so that the number of the steel balls is determined to be 13.
In the embodiment, the number of the steel balls is 13;
v determining structural parameters of ball screw
The length of the ball head screw is required to ensure that the circle center of the ball head and the circle center of the steel balls arranged in the push rod ring groove are positioned on the same circumference so as to ensure that the ball head screw is not influenced by lateral force along the tangential direction of the circular arc under the interaction force of the steel balls at two sides. In order to ensure that the steel balls with phi 2mm can work normally. The length L of the ball screw is 2.9-3 mm, and the radius of the end face is a hemispherical structure of R1. And the rotation of the interface component can not influence the rotation of the internal steel balls along the arc groove.
In the embodiment, the length L of the ball screw is 2.9-3 mm, and the radius of the hemispherical structure of the end face is R1;
through the steps, the design of the brake instruction sensor interface assembly is completed.
Claims (5)
1. The design method of the brake instruction sensor interface component is characterized in that the brake instruction sensor interface component comprises a movable bracket, a plurality of steel balls, ball screws, a push rod and a joint bearing; the steel balls are discharged in steel ball grooves on the circumferential surface of the outer end of the push rod; one end of the movable support is sleeved on the outer circumferential surface of the outer end of the push rod, and the surface of the steel ball is in rolling fit with the inner surface of the movable support; the movable bracket is fastened with the push rod through a ball screw; the movable support is in clearance fit connection with the push rod through a shaft hole; a reset spring is arranged in an inner hole of the push rod; a gap of 2-2.5 mm is formed between the inner end surface of the movable support and the adjacent end surface of the push rod;
the movable support is divided into a push rod connecting end and an interface end according to functions; the end surface of the inner end of the connecting end of the push rod is provided with a blind hole; the inner diameter of the blind hole is the same as the outer diameter of the push rod; an annular groove is formed in the inner circumference of the middle part of the blind hole, and the position of the groove corresponds to the steel ball groove on the push rod after assembly; the inner diameter of the groove = push rod outer diameter + steel ball radius x 2; a shell of the connecting end of the push rod is provided with a mounting hole of a ball screw, and the mounting hole is communicated with the steel ball groove; the interface end is positioned on the end face of the connecting end of the push rod; the interface end is provided with a through hole for connecting the pedal knuckle bearing;
step one, determining an idle stroke of an interface component:
the idle stroke of the interface component is a movement gap reserved between the inner end surface of the blind hole of the movable bracket and the end surface of the adjacent push rod, so that the movable bracket needs to eliminate the movement gap when the movable bracket is subjected to axial displacement by the acting force of the pedal; when the interface component moves, if the movement gap is not eliminated, the push rod does not generate displacement, and the output voltage of the brake instruction sensor is unchanged;
the movement gap is 2-2.5 mm, so that potential safety hazards caused by the error braking of the aircraft due to misoperation are prevented;
step two, determining the movable range of the interface component:
the interface component activity range includes:
i, the interface component rotates 360 degrees around the axis of the interface component;
II, working stroke of the interface component; the working stroke of the interface component is axial displacement, the displacement distance is 15mm, and the interface component consists of an idle stroke of the interface component and an actual stroke of the interface component; the actual stroke of the interface component is the working stroke of the brake instruction sensor;
III, offset between the movable support and the push rod in the interface component; in the working stroke of the interface component, the change of the included angle between the center line of the movable bracket and the center line of the push rod is not more than 14 degrees; in the process, the brake command sensor moves flexibly without clamping stagnation;
step three, determining structural parameters of the interface component:
the inner diameter of the movable bracket of the interface component is in clearance fit with the outer diameter of the push rod;
and I, determining the diameter of the steel ball:
simulation mechanical analysis is carried out on the steel ball strength through ANSYS software, and the diameter of the steel ball is determined to be 2mm so as to meet the bearing requirement of 1335N;
II, determining the size of a steel ball groove on the push rod:
determining that the arc radius of a steel ball groove on the push rod is 1.1-1.2 mm, and the center distance of the steel ball groove is 4.5mm from the end face of the push rod at the end of the steel ball groove;
and III, determining the size of the groove on the movable support:
the inner diameter of the blind hole at the connecting end of the movable bracket push rod is 9.6mm; the inner diameter of the annular groove at the middle part of the blind hole is 11.5-12 mm, and the axial width of the groove is 4.2mm;
IV, determining the number of steel balls:
the number N of steel balls is calculated by the formula (1):
wherein: d (D) 1 The outer diameter of the push rod is 9.5mm, D 2 The diameter of the annular groove, d is the diameter of the steel ball, and beta is a constant 1.02;
v. determining structural parameters of ball screw
The length of the ball head screw is required to ensure that the circle center of the ball head and the circle center of the steel balls arranged in the push rod ring groove are positioned on the same circumference so as to ensure that the ball head screw is not influenced by lateral force along the tangential direction of the circular arc due to the interaction force of the steel balls at two sides; the length L of the ball screw is 2.9-3 mm, and the radius of the ball screw is R1;
thus, the design of the brake command sensor interface assembly is completed.
2. The method for designing a brake command sensor interface assembly according to claim 1, wherein the outer diameter of the connecting end of the push rod of the movable bracket is 20mm, the inner diameter of the blind hole is 9.6mm, the inner diameter of the annular groove in the middle of the blind hole is 11.5-12 mm, and the axial width of the groove is 4.2mm; the center of the groove in the width direction is 3.5mm away from the end face of the connecting end of the push rod.
3. The method of designing a brake command sensor interface assembly according to claim 2, wherein the ball screw has a T-shape; the length L of the ball screw is 2.9-3 mm; the diameter of the large-diameter end of the ball screw is 5mm, the length of the large-diameter end of the ball screw is 3mm, the small-diameter end of the ball screw is a connecting end, and the circumferential surface of the connecting end is a thread surface; the end head of the connecting end is a hemispherical body which is contacted with the steel ball arranged in the annular groove, and the radius of the hemispherical body is 1mm.
4. The method for designing a brake command sensor interface assembly according to claim 1, wherein an outer circumferential surface of one end of the push rod has an annular steel ball groove; the outer diameter of the push rod is 9.5mm; the radius of the steel ball groove is 1.1-1.2 mm, and the center distance of the steel ball groove is 4.5mm from the end face of the end; two rectangular positioning plates protruding radially are symmetrically distributed on the outer circumferential surface of the other end of the push rod, and radial grooves are formed in the outer ends of the positioning plates and used for guiding and positioning when the instruction sensor works.
5. The method of claim 1, wherein the number of steel balls is 13, and the diameter of the steel balls is 2mm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2984101A1 (en) * | 2011-12-14 | 2013-06-21 | Steel Flower | System for releasably fixing foot on plate of furniture i.e. office desk, has bolt received in housing, where bolt is provided at interior end of ball to engage with throat of pawn when bolt is introduced into boring of insert |
| CN204718618U (en) * | 2015-06-16 | 2015-10-21 | 西安航空制动科技有限公司 | A kind of two remaining shock type brake instruction transducer |
| CN205478880U (en) * | 2016-03-29 | 2016-08-17 | 云南电网有限责任公司曲靖供电局 | Live working is with universal adapter of general type |
| CN212289787U (en) * | 2020-04-09 | 2021-01-05 | 西安航空制动科技有限公司 | Interface assembly for aircraft brake command sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH705122A1 (en) * | 2011-06-16 | 2012-12-31 | Arx Ag | Quick coupling for connecting a replaceable head. |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2984101A1 (en) * | 2011-12-14 | 2013-06-21 | Steel Flower | System for releasably fixing foot on plate of furniture i.e. office desk, has bolt received in housing, where bolt is provided at interior end of ball to engage with throat of pawn when bolt is introduced into boring of insert |
| CN204718618U (en) * | 2015-06-16 | 2015-10-21 | 西安航空制动科技有限公司 | A kind of two remaining shock type brake instruction transducer |
| CN205478880U (en) * | 2016-03-29 | 2016-08-17 | 云南电网有限责任公司曲靖供电局 | Live working is with universal adapter of general type |
| CN212289787U (en) * | 2020-04-09 | 2021-01-05 | 西安航空制动科技有限公司 | Interface assembly for aircraft brake command sensor |
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