Knob self-locking device for electrically controlled parking of an aircraft

Abstract

The present application relates to a kind of knob self-locking device for electric control parking of aircraft, including knob, washer, nut, lever, lever seat, bushing, spring, end cover, screw, cross bar.Lever is fixedly connected with knob, washer is used to lock position between knob and lever;Lever is located in lever seat, and cross bar passes through lever.Bushing is fixedly connected with lever seat, spring is located between the bottom surface of lever seat and lever disc, and end cover is fixedly connected with lever seat by screw.Lever is integral structure, its bottom, stem, connecting end are sequentially connected, and central axis coincides.Lever seat is integral structure, the square disc of lever seat is in lower side, and ring wall is in upper side.The slide way and recess of lever seat, spring pre-tightening force, so that knob self-locking device has semi-automatic reset function and self-locking function;Rotation angle is small, structure is simple and compact, and it is easy to operate, reset labor-saving;Friction noise is low, and structure is reliable.

Description

Technical Field

[0001] This invention belongs to the field of mechanical switch technology, specifically relating to a knob self-locking device for aircraft electronically controlled shutdown. Background Technology

[0002] The stop brake switch is a crucial component for stopping an aircraft. Before takeoff or during parking, the stop brake switch maintains the wheel brake pressure at the stop brake pressure to ensure the aircraft wheels are in a stopped braking state and to guarantee parking safety. Currently, all stop brake switches used on aircraft are hydraulic; there are no electrically controlled stop brake switches.

[0003] Chinese invention patent CN 104943856 B proposes a hydraulic stop brake switch to solve the problem of unstable braking pressure when the aircraft is parked. However, this stop brake switch is not applicable to electronic stop switches, and it does not mention a knob structure suitable for electronic stop switches.

[0004] Chinese invention patent CN 102530247 B discloses a return mechanism for an automatic brake selector switch in an aircraft anti-skid braking system. The return mechanism includes a rotary rod, a panel, a screw, a spring, a rotating bracket, a return spring, a rotating block, and a partition. In use, when the rotary rod is pressed down and rotated by external force, it drives an external drive rod to move axially and rotate, causing the external drive rod to insert into the oblong hole of the rotating block and rotate it, maintaining the selected signal position. When resetting is required, the rotary rod returns axially under the action of the spring, the external drive rod disengages from the rotary rod, and the rotating block returns to its original position under the action of the return spring. This return mechanism requires the operator to rotate while pressing down. During the pressing and rotating process, the friction between the rotating parts must be overcome, requiring the operator to overcome significant friction and generating noise during the friction process. Summary of the Invention

[0005] To address the lack of an electrically controlled stop switch in aircraft braking operations, this invention proposes a knob self-locking device for an aircraft electrically controlled stop switch.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows:

[0007] A knob self-locking device for electronically controlled aircraft shutdown includes a knob, a washer, a nut, a lever, a lever seat, a bushing, a spring, an end cap, a screw, and a crossbar. The lever is fixedly connected to the knob. The washer and the nut are located between the knob and the lever to lock the knob and lever in a locked position. The lever is located within the lever seat. The crossbar passes through the lever and connects to the lever seat and the end cap. The bushing is fixedly connected to the lever seat. The spring is located between the bottom surface of the lever seat and the lever disc. The end cap is fixedly connected to the lever seat by a screw.

[0008] The lever is an integral structure, consisting of a bottom, a rod, and a connecting end.

[0009] The bottom, the rod, and the connecting end are connected in sequence, and the central axes of the three coincide.

[0010] The bottom is cylindrical and is used to define the spring; a slot is provided at the center of the cylinder and extends along the cylinder axis to the rod to drive the external driven component.

[0011] The rod is cylindrical, and a slot is provided at the bottom of the rod, extending from the bottom.

[0012] The connecting end is an incomplete cylinder after the inner chord is cut along the axial direction. The connecting end is matched and connected to the threaded hole of the knob and cooperates with the retaining hole of the washer.

[0013] The lever seat is an integral structure, which can be divided into two parts: a square plate and a ring wall.

[0014] The square plate is on the lower side, and the annular wall is on the upper side; the central axes of the annular wall and the square plate coincide.

[0015] The aforementioned knob self-locking device has a "T"-shaped integral structure located at the top of the knob self-locking mechanism. It is divided into three parts: a horizontal end, a vertical end, and a rib. The horizontal end and the rib are on the upper side, and the vertical end is on the lower side. The horizontal end, the vertical end, and the rib are connected in pairs.

[0016] The horizontal end is a cuboid, and the surface formed by the midpoint of the horizontal end along its length coincides with the central symmetry plane of the rib. The side of the horizontal end that contacts the rib has a smooth transition.

[0017] The vertical end is cuboid in shape, with the plane formed by the midpoint of its width direction and the plane formed by the midpoint of its length direction being on the same plane, and the length direction being perpendicular to the length direction of the horizontal end. The bottom of the vertical end has a threaded hole and a slot. The threaded hole matches the threaded end of the lever for connection. The slot is cuboid, located on the side of the vertical end near the rib, and is used to fix a washer. The central symmetry plane of the slot coincides with the central symmetry plane of the rib.

[0018] The rib is a quarter-cylinder, with a height equal to the thickness of the vertical end. The plane formed by the midpoint of the cylindrical rib in the height direction and the plane formed by the midpoint of the vertical end in the width direction are the same plane. The height of the horizontal end is equal to the radius of the cylindrical rib, and the value of the vertical end length minus the horizontal end width is equal to the radius of the cylindrical rib.

[0019] In the aforementioned knob self-locking device, the washer is an integral, thin plate-shaped structure that connects to the knob and can be divided into a horizontal part and a vertical part. The horizontal part and the vertical part are at 90° to each other and are smoothly transitioned.

[0020] The horizontal portion contacts the bottom surface of the vertical end of the knob and is divided into a circular ring and a connecting portion. The connecting portion is a rectangular thin plate that connects to the vertical portion, and the width of the connecting portion is equal to the width of the vertical portion. The circular ring is a ring with a cutting chord. The inner and outer cutting chords are parallel to each other and parallel to the intersection line of the horizontal and vertical portions. The circular hole at the inner cutting chord is a locking hole, which is a through hole that matches the lever. The lever passes through the locking hole and is threadedly connected to the knob; the locking hole limits the circumferential rotation of the lever.

[0021] The vertical section is a rectangular thin plate, and the width of the vertical section matches the knob slot.

[0022] The washer restricts the relative rotation between the knob and the lever; when the knob rotates about the center line of the lever, the washer rotates simultaneously with the knob and the lever.

[0023] In the aforementioned knob self-locking device, the bottom defines the spring, and the lower end of the spring is connected to the upper end face of the bottom; the slot passing through the center of the cylinder is a through slot in the radial direction of the cylinder; the length of the slot extending along the axial direction of the cylinder matches the length of the external driven component.

[0024] The outer diameter of the rod matches the inner diameter of the bushing, with a clearance fit. The rod has a through-hole, cylindrical hole whose centerline intersects the centerline of the rod perpendicularly. The diameter of the hole is smaller than the diameter of the rod. The hole matches the crossbar, which passes through it for fixing.

[0025] The connecting end surface is threaded, and its outer diameter is smaller than that of the rod.

[0026] In the aforementioned knob self-locking device, the crossbar is a cylinder that passes through the fixing hole of the lever and matches the fixing hole. The two are in an interference fit. The length of the crossbar is equal to the outer diameter of the ring wall of the lever seat. The crossbar matches the lever seat.

[0027] The aforementioned knob self-locking device comprises a square plate with a central through hole. A circular hole, which is a through hole, is located in the center of the square plate and matches a bushing. Bolt holes are evenly distributed near the corners of the square plate, with equidistant holes on adjacent sides, i.e., located on the diagonal of the square plate. The end cap is fixed to the lever seat using screws. An annular groove is provided on the bottom surface of the square plate, with its center line coinciding with the center line of the circular hole. The diameter of the annular groove is larger than the diameter of the circular hole, matching a spring, with the upper end of the spring located within the annular groove.

[0028] The ring wall is circular, with its bottom end connected to the square plate. The upper end has end faces of varying heights along the circumference of the ring, but all at the same height along the same circumference. The upper end face of the ring wall is divided into an upper groove, a lower groove, a slide rail, and a platform. These grooves are sequentially connected to form a set of tracks. There are two sets of tracks on the upper end of the ring wall, symmetrically distributed relative to the center line of the ring wall. A platform is positioned between the two sets of tracks. The end of the crossbar can slide along the tracks, i.e., the lever or knob can rotate, and the lever moves vertically.

[0029] The upper groove is a semi-cylindrical surface, with its central axis perpendicular to the central axis of the ring wall, and the diameter of the cylindrical surface of the upper groove is equal to the diameter of the crossbar.

[0030] The lower groove is a quarter-cylindrical surface, with its central axis perpendicular to the central axis of the ring wall, and the diameter of the lower groove cylinder is equal to the diameter of the crossbar.

[0031] The central axes of the upper groove and the lower groove form a 90° angle with the surface formed by the central axis of the lever seat.

[0032] The slide rail starts at the high end and ends at the low end; the high end connects to the upper groove, and the low end connects to the lower groove.

[0033] The slide rail is smoothly connected to the upper groove and the lower groove respectively; the central axis of the upper groove is consistent with the highest end of the slide rail; the lower groove and the slide rail have a smooth transition.

[0034] The platform connects with the upper and lower grooves. The platform portion is one-quarter of the annular wall ring. Together with the upper groove, it defines the highest position of the crossbar, so that the knob self-locking device is in the locked state; together with the lower groove, it defines the lowest position of the crossbar, so that the knob self-locking device is in the initial state.

[0035] In the initial state, the two ends of the crossbar are located in the lower grooves of the two sets of tracks. When the knob is turned, it drives the lever and the crossbar to rotate. The crossbar starts from the position of the upper groove, slides along the slide, and finally is located in the upper groove of the lever seat, thus achieving the locking state.

[0036] A step is provided in the middle through hole of the ring wall. The step is annular and mates with the bushing to position the bushing. The inner wall of the step is threaded and is threadedly connected and fixed with the bushing.

[0037] In the aforementioned knob self-locking device, the bushing is a rotating body with an integral structure, comprising a circular end and a threaded ring, the center lines of which coincide. The bushing has a circular through hole in the middle, through which the lever passes, with a clearance fit between them. The circular through hole in the bushing guides and limits the lever's rotation.

[0038] The ring has a circular end and a circular through hole in the middle.

[0039] The threaded ring is a ring with threads on its outer circumference. The diameter of the through hole in the middle is equal to the diameter of the through hole at the end of the ring, and the diameter of the outer circumference of the threaded ring is smaller than the outer diameter of the end of the ring.

[0040] The bushing is located in the stepped threaded hole of the lever seat, and the connection between the bushing and the lever seat is fixed by the thread.

[0041] The bushing material is FZ00-01, an iron-based powder metallurgy material with self-lubricating properties.

[0042] The aforementioned knob self-locking device has an integral end cover, consisting of a base and a protective cover, with their center lines coinciding; the base is on the lower side and the protective cover is on the upper side.

[0043] The chassis is a square plate with a through hole in the center. A circular through hole is set in the center of the square plate. The circular through hole is a through hole and matches the annular wall of the lever seat. Bolt holes are set near the corners. The bolt holes are evenly distributed and the distance between the two sides that are close to each other is equal. They are used to fix the position between the end cap and the lever seat. The position of the bolt holes matches the square plate.

[0044] The cover is cylindrical with the opening at the bottom. A lever through hole is provided at the bottom of the cylinder. The lever through hole is a through hole with a size that matches the lever shaft. The inner diameter of the cover cylinder is equal to the diameter of the circular through hole in the chassis.

[0045] The end cap limits the position of the lever.

[0046] The beneficial effects of this invention are:

[0047] A knob self-locking device for aircraft electronically controlled shutdown features a T-shaped knob. The operator rotates the knob by holding its horizontal end, providing a better tactile feel. Washers and nuts position the knob and lever to prevent displacement. A horizontal bar is inserted into the lever's shaft. As the knob rotates, the bar moves axially along the slide of the lever seat, eventually locking into the upper groove of the lever seat and achieving a locked position under spring force. The bushing is made of a self-lubricating iron-based material, effectively reducing friction between the rotating lever seat and the fixed bushing, thus reducing operator effort and offering advantages such as reduced friction, lower friction noise, and improved structural reliability.

[0048] When a reset is required, the operator simply lifts the knob to displace the crossbar from the upper groove of the lever seat. Under the elastic force of the spring, the lever automatically returns to its initial position along the slide of the lever seat.

[0049] The slide rails and grooves of the lever seat, along with the spring preload, enable it to have a semi-automatic reset function and a self-locking function. It features a small rotation angle, a simple and compact structure, easy installation, simple operation, and effortless reset. Attached Figure Description

[0050] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0051] Figure 1 This is a cross-sectional view of the knob self-locking device along the center line of the lever;

[0052] Figure 2 This is a 3D view of the knob self-locking device;

[0053] Figure 3 It is a 3D diagram of the knob;

[0054] Figure 4 This is a cross-sectional view of the knob along the midpoint of its vertical width.

[0055] Figure 5 This is the left view of the knob;

[0056] Figure 6 This is a cross-sectional view of the washer along its centerline;

[0057] Figure 7 This is a top view of the washer;

[0058] Figure 8 This is the main view of the lever;

[0059] Figure 9 This is a top view of the lever;

[0060] Figure 10 This is a bottom view of the lever;

[0061] Figure 11 This is a sectional view of the bushing along its centerline;

[0062] Figure 12 This is a 3D diagram of the lever holder;

[0063] Figure 13 It is a cross-sectional view of the lever seat along the plane of symmetry of the center of the square plate;

[0064] Figure 14 This is a sectional view of the end cap along the centerline;

[0065] Figure 15 This is a top view of the end cap.

[0066] In the diagram: 1. Knob; 2. Washer; 3. Nut; 4. Lever; 5. Lever seat; 6. Bushing; 7. Spring; 8. End cap; 9. Screw; 10. Crossbar; 41. Bottom; 42. Rod; 43. Connecting end; 44. Fixing hole; 51. Square plate; 52. Ring wall; 521. Upper groove; 522. Lower groove; 523. Slide; 524. Step; 61. Circular end; 62. Threaded ring; 81. Protective cover; 82. Base. Detailed Implementation

[0067] Example 1

[0068] A knob self-locking device for electronically controlled aircraft shutdown includes a knob 1, a washer 2, a nut 3, a lever 4, a lever seat 5, a bushing 6, a spring 7, an end cap 8, a screw 9, and a crossbar 10.

[0069] like Figure 1 , Figure 2 As shown, lever 4 and knob 1 are fixedly connected by threads. Washer 2 and nut 3 are located between knob 1 and lever 4 to lock the position between knob 1 and lever 4. Lever 4 is located inside lever seat 5. Crossbar 10 passes through lever 4 and connects to lever seat 5 and end cap 8. Bushing 6 is fixedly connected to lever seat 5 by threads. Spring 7 is located between the positioning groove on the bottom surface of lever seat 5 and the disc of lever 4. End cap 8 is fixedly connected to lever seat 5 by screw 9.

[0070] like Figure 3 , Figure 4 , Figure 5 As shown, knob 1 has a "T" shaped overall structure and is located at the top of the knob self-locking mechanism. It is divided into three parts: horizontal end, vertical end, and rib. The horizontal end and rib are on the upper side, and the vertical end is on the lower side. The horizontal end, vertical end, and rib are connected in pairs.

[0071] The horizontal end is a cuboid, and the surface formed by the midpoint of the horizontal end along its length coincides with the central symmetry plane of the rib. The side of the horizontal end that contacts the rib has a smooth transition.

[0072] The vertical end is a cuboid, and the plane formed by the midpoint of the width direction is the same plane as the plane formed by the midpoint of the length direction of the horizontal end. The length direction is perpendicular to the length direction of the horizontal end. The bottom of the vertical end is provided with a threaded hole and a slot. The threaded hole matches the threaded end of the lever 4 and is used to connect with the lever 4. The slot is a cuboid and is located on the side of the vertical end near the rib. The slot is used to fix the washer 2. The central symmetry plane of the slot coincides with the central symmetry plane of the rib.

[0073] The ribs are quarter-cylinders, with a height equal to the thickness of the vertical end; the plane formed by the midpoint of the cylindrical rib in the height direction and the plane formed by the midpoint of the vertical end in the width direction are the same plane; the height of the horizontal end is equal to the radius of the cylindrical rib, and the value of the vertical end length minus the horizontal end width is equal to the radius of the cylindrical rib.

[0074] Knob 1 has a T-shaped overall structure, which conforms to ergonomic requirements.

[0075] like Figure 6 , Figure 7 As shown, washer 2 is an integral structure, thin plate-shaped, symmetrical along the center line, connected to knob 1, and can be divided into horizontal and vertical parts, which are at 90° to each other and have a smooth transition.

[0076] The horizontal part contacts the bottom surface of the vertical end of the knob 1 and is divided into a circular part and a connecting part. The connecting part is a rectangular thin plate that connects to the vertical part. The width of the connecting part is equal to the width of the vertical part. The circular part is a ring with a cutting chord. The inner cutting chord is parallel to the outer cutting chord and parallel to the intersection line of the horizontal and vertical parts. The circular hole at the inner cutting chord is a locking hole. The locking hole is a through hole and matches the lever 4. The lever 4 passes through the locking hole and is threaded to the knob 1. The cross-section of the lever 4 passing through the locking hole is consistent with the shape of the locking hole. The locking hole limits the circumferential rotation of the lever 4.

[0077] The vertical section is a rectangular thin plate, and the width of the vertical section matches the slot of knob 1.

[0078] Washer 2 restricts the relative rotation between knob 1 and lever 4. When knob 1 rotates about the center line of lever 4, washer 2 rotates simultaneously with knob 1 and lever 4.

[0079] like Figure 8 , Figure 9 , Figure 10 As shown, the lever 4 is an integral structure, consisting of a bottom 41, a lever 42, and a connecting end 43.

[0080] The bottom 41, the rod 42, and the connecting end 43 are connected in sequence, and the central axes of the three coincide.

[0081] The bottom 41 is cylindrical and serves to constrain the spring 7. The lower end of the spring 7 is connected to the upper surface of the bottom 41. A slot is provided through the center of the cylinder, which is a radial through groove that extends axially along the cylinder to the rod 42 to drive an external driven component. The length of the slot extending axially along the cylinder matches the length of the external driven component.

[0082] The rod 42 is cylindrical, and its outer diameter matches the inner diameter of the bushing 6, with a clearance fit between them. The rod 42 is provided with a fixing hole 44, which is a through hole, cylindrical, and its center line intersects perpendicularly with the center line of the rod 42. The diameter of the fixing hole 44 is smaller than the diameter of the rod 42. The fixing hole 44 matches the crossbar 10, and the crossbar 10 passes through the fixing hole 44 to fix the crossbar 10. The lower part of the rod 42 is provided with a slot, which extends from the bottom 41.

[0083] The connecting end 43 is an incomplete cylinder after the inner cutting chord is cut along the axial direction. The surface of the incomplete cylinder is provided with threads, and the outer diameter is smaller than the outer diameter of the rod 42. The connecting end 43 is matched and connected with the threaded hole of the knob 1 and cooperates with the retaining hole of the washer 2.

[0084] The crossbar 10 is a cylinder that passes through the fixing hole 44 of the lever 4 and matches the fixing hole 44. The two are in an interference fit. The length of the crossbar 10 is greater than the diameter of the rod part 42 and is equal to the outer diameter of the ring wall 52 of the lever seat 5. The crossbar 10 also matches the lever seat 5.

[0085] like Figure 12 , 13 As shown, the lever seat 5 is an integral structure, which can be divided into two parts: a square plate 51 and an annular wall 52.

[0086] The square plate 51 is on the lower side, and the annular wall 52 is on the upper side. The central axes of the annular wall 52 and the square plate 51 coincide.

[0087] The square plate 51 is a square plate with a through hole in the center. A circular hole, which is a through hole, is located in the center of the square plate and matches the bushing 6. Bolt holes are located near the corners of the square plate, evenly distributed, with equal distances between adjacent sides, i.e., located on the diagonal of the square plate. The end cap 8 is fixed to the lever seat 5 by screws 9. An annular groove is provided on the bottom end face of the square plate 51, with its center line coinciding with the center line of the circular hole. The diameter of the annular groove is larger than the diameter of the circular hole, matching the spring 7. The upper end of the spring 7 is located within the annular groove.

[0088] The annular wall 52 is circular, with its bottom end connected to the square plate 51. Its upper end has end faces of varying heights along the circumference of the ring, but all at the same height along the same circumference. The upper end face of the annular wall 52 is divided into an upper groove 521, a lower groove 522, a slide rail 523, and a platform 524. The upper groove 521, slide rail 523, and lower groove 522 are sequentially connected to form a set of tracks. There are two sets of tracks on the annular wall 52, symmetrically distributed relative to the center line of the annular wall 52. A platform is provided between the two sets of tracks. The end of the crossbar 10 can slide along the tracks, i.e., the lever 4 and knob 1 rotate, and the lever 4 moves vertically.

[0089] The upper groove 521 is a semi-cylindrical surface, and its central axis is perpendicular to the central axis of the annular wall 52. The diameter of the cylindrical surface of the upper groove 521 is equal to the diameter of the crossbar 10.

[0090] The lower groove 522 is a quarter-cylindrical surface, and its central axis is perpendicular to the central axis of the ring wall. The diameter of the cylinder of the lower groove 522 is equal to the diameter of the crossbar 10.

[0091] The central axes of the upper groove 521 and the lower groove 522 form a 90° angle with the surface formed by the central axis of the lever seat 5, and the distance between the central axes of the upper groove 521 and the lower groove 522 is 3mm.

[0092] The slide 523 starts from the high end and ends at the low end; the high end connects to the upper groove 521, and the low end connects to the lower groove 522.

[0093] The slide 523 is smoothly connected to the upper groove 521 and the lower groove 522 respectively. The central axis of the upper groove 521 is aligned with the highest point of the slide 523; the lower groove 522 and the slide 523 have a smooth transition.

[0094] Platform 524 is connected to the upper groove 521 and the lower groove 522. Platform 524 is a quarter of the annular wall 52. Together with the upper groove 521, it defines the highest position of the crossbar 10, so that the knob self-locking device is in the locked state. Together with the lower groove 522, it defines the lowest position of the crossbar 10, so that the knob self-locking device is in the initial state.

[0095] In the initial state, the two ends of the crossbar 10 are located in the lower grooves 522 of the two sets of tracks. When the knob 1 is turned, it drives the lever 4 and the crossbar 10 to rotate. The crossbar 10 starts from the position of the upper groove 521 and slides along the slide 523, eventually located in the upper groove 521 of the lever seat 5, thus achieving the locked state.

[0096] An annular step 525 is provided in the middle through hole of the annular wall 52. The step 525 cooperates with the bushing 6 to position the bushing 6. The inner wall of the step 525 is provided with threads, and is threadedly connected and fixed with the bushing 6.

[0097] like Figure 11 As shown, bushing 6 is a T-shaped rotating body with an integral structure, consisting of two parts: a circular end 61 and a threaded ring 62, whose center lines coincide. Bushing 6 has a circular through hole in the middle, through which the rod 42 of lever 4 passes, with a clearance fit between them. The circular through hole of bushing 6 guides and limits the lever 4 during rotation.

[0098] The ring end 61 is a ring with a circular through hole in the middle;

[0099] The threaded ring 62 is a ring with threads on its outer circumference. The diameter of the through hole in the middle is equal to the diameter of the through hole at the end of the ring 61. The diameter of the outer circumference of the threaded ring 62 is smaller than the outer diameter of the end of the ring 61.

[0100] The bushing 6 is located in the threaded hole of the step 525 of the lever seat 5, and the connection between the bushing 6 and the lever seat 5 is fixed by the thread.

[0101] Due to the relative movement between lever 4 and bushing 6 during operation, to reduce the friction between them, bushing 6 is made of iron-based powder metallurgy material FZ00-01 with self-lubricating properties. This material has special porous and interconnected pores containing sufficient lubricating oil, ensuring automatic circulation and adjustment of the lubricating oil. It features long service life, low noise, and self-lubricating properties.

[0102] like Figure 14 , Figure 15 As shown, the end cap 8 is an integral structure, consisting of a chassis 82 and a protective cover 81, with their center lines coinciding. The chassis 82 is on the lower side, and the protective cover 81 is on the upper side.

[0103] The base plate 82 is a square plate with a through hole in the center. A circular through hole is set in the center of the square plate, which matches the annular wall 52 of the lever seat 5. Bolt holes are set near the corners, evenly distributed, with the distance between the two sides being equal, i.e., located on the diagonal of the square plate, for fixing the position between the end cover 8 and the lever seat 5. The position of the bolt holes matches that of the square plate 51.

[0104] The cover 81 is cylindrical with its opening at the bottom. A through hole for the lever is located at the bottom of the cylinder, and its dimensions match those of the lever 4's shaft 42. The inner diameter of the cover 81 cylinder is equal to the diameter of the circular through hole in the base 82.

[0105] The end cap 8 is used to protect the lever seat 5 and lever 4 from being exposed, and to limit the position of lever 4.

[0106] The working process of a rotary self-locking device for an aircraft stop switch is as follows:

[0107] Initially, the crossbar 10 is fixed in the lower groove 522 of the lever seat 5, and is held in place by the initial preload of the spring 7. When the operator rotates the knob 1 clockwise, the lever 4 and the crossbar 10 rotate along the slide 523 of the lever seat 5 under the influence of the knob and the self-lubrication of the bushing 6, and the external passive component rotates accordingly. As the slide 523 in the lever seat 5 gradually rises, the spring 7 is compressed during the rotation of the lever 4. When the rotation angle reaches 90°, the crossbar 10 is locked in the upper groove 521 of the lever seat 5. Under the force of the spring 7, the lever 4, the crossbar 10, and the lever seat 5 achieve self-locking, reaching a locked state. To reset, the operator rotates the knob 1 counterclockwise, causing the crossbar 10 to disengage from the upper groove 521 of the lever seat 5. Under the force of the spring, the crossbar 10 and the lever 4 automatically return to their initial positions, and the external passive component resets.

Claims

1. A rotary self-locking device for electronically controlled aircraft shutdown, characterized in that, The assembly includes a knob (1), a washer (2), a nut (3), a lever (4), a lever seat (5), a bushing (6), a spring (7), an end cap (8), a screw (9), and a crossbar (10). The lever (4) is fixedly connected to the knob (1). The washer (2) and the nut (3) are located between the knob (1) and the lever (4) to lock the knob (1) and the lever (4). The lever (4) is located inside the lever seat (5). The crossbar (10) passes through the lever (4) and connects to the lever seat (5) and the end cap (8). The bushing (6) is fixedly connected to the lever seat (5). The spring (7) is located between the bottom surface of the lever seat (5) and the disc of the lever (4). The end cap (8) is fixedly connected to the lever seat (5) by the screw (9). The lever (4) is an integral structure, consisting of a bottom (41), a rod (42), and a connecting end (43). The bottom (41), the rod (42), and the connecting end (43) are connected in sequence, and the central axes of the three coincide. The bottom (41) is cylindrical and is used to limit the spring (7); a slot is provided at the center of the cylinder and extends along the cylinder axis to the rod (42) to drive the external driven component; The rod (42) is cylindrical, and a slot is provided at the lower part of the rod (42), which extends from the bottom (41); The connecting end (43) is an incomplete cylinder after the inner cutting chord is cut along the axial direction. The connecting end (43) is matched and connected with the threaded hole of the knob (1) and cooperates with the locking hole of the washer (2). The lever seat (5) is an integral structure, which can be divided into two parts: a square plate (51) and a ring wall (52); The square plate (51) is on the lower side, and the annular wall (52) is on the upper side; the central axes of the annular wall (52) and the square plate (51) coincide. The knob (1) has a "T" shaped overall structure and is located at the top of the knob self-locking mechanism. It is divided into three parts: horizontal end, vertical end, and rib. The horizontal end and rib are on the upper side, and the vertical end is on the lower side. The horizontal end, vertical end, and rib are connected in pairs. The horizontal end is a cuboid, and the surface formed by the midpoint of the horizontal end along its length coincides with the central symmetry plane of the rib. The side of the horizontal end that contacts the rib has a smooth transition. The vertical end is a cuboid, and the plane formed by the midpoint of the width direction and the plane formed by the midpoint of the length direction of the horizontal end are the same plane, and the length direction is perpendicular to the length direction of the horizontal end; the bottom of the vertical end is provided with a threaded hole and a slot, the threaded hole matches the threaded end of the lever (4) and is used to connect with the lever (4); the slot is a cuboid, located on the side of the vertical end near the rib, and is used to fix the washer (2), and the central symmetry plane of the slot coincides with the central symmetry plane of the rib; The rib is a quarter-cylinder, with a height equal to the thickness of the vertical end; the plane formed by the midpoint of the height direction of the cylindrical rib and the plane formed by the midpoint of the width direction of the vertical end are the same plane; the height of the horizontal end is equal to the radius of the cylindrical rib, and the value of the vertical end length minus the horizontal end width is equal to the radius of the cylindrical rib.

2. The rotary self-locking device for aircraft electronically controlled shutdown according to claim 1, characterized in that, The washer (2) is an integral structure, thin plate-shaped, connected to the knob (1), and can be divided into a horizontal part and a vertical part. The horizontal part and the vertical part are at 90° and the horizontal part and the vertical part are smoothly transitioned. The horizontal part contacts the bottom surface of the vertical end of the knob (1) and is divided into a ring part and a connecting part. The connecting part is a rectangular thin plate that is connected to the vertical part. The width of the connecting part is equal to the width of the vertical part. The ring part is a circular ring with a cutting chord. The inner cutting chord is parallel to the outer cutting chord and parallel to the intersection line of the horizontal part and the vertical part. The circular hole at the inner cutting chord is a locking hole. The locking hole is a through hole. The locking hole matches the lever (4). The lever (4) passes through the locking hole and is threadedly connected to the knob (1). The locking hole limits the circumferential rotation of the lever (4). The vertical part is a rectangular thin plate, and the width of the vertical part matches the slot of the knob (1); The washer (2) restricts the relative rotation between the knob (1) and the lever (4); when the knob (1) rotates around the center line of the lever (4), the washer (2) rotates simultaneously with the knob (1) and the lever (4).

3. The rotary self-locking device for aircraft electronically controlled shutdown according to claim 1, characterized in that, The bottom (41) defines the spring (7), and the lower end of the spring (7) is in contact with the upper end face of the bottom (41); the slot passing through the center of the cylinder is a through slot in the radial direction of the cylinder; the length of the slot extending along the axial direction of the cylinder matches the length of the external driven component. The outer diameter of the rod (42) matches the inner diameter of the bushing (6), and the two are in clearance fit; the rod (42) is provided with a fixing hole (44), which is a through hole, cylindrical, and its center line intersects the center line of the rod (42) perpendicularly. The diameter of the fixing hole (44) is smaller than the diameter of the rod (42). The fixing hole (44) matches the crossbar (10), and the crossbar (10) passes through the fixing hole (44) to fix the crossbar (10). The connecting end (43) has a threaded surface and its outer diameter is smaller than that of the rod (42).

4. The rotary self-locking device for aircraft electronically controlled shutdown according to claim 1, characterized in that, The crossbar (10) is a cylinder that passes through the fixing hole (44) of the lever (4) and matches the fixing hole (44). The two are interference fit. The length of the crossbar (10) is equal to the outer diameter of the ring wall (52) of the lever seat (5). The crossbar (10) matches the lever seat (5).

5. The rotary self-locking device for aircraft electronically controlled shutdown according to claim 1, characterized in that, The square plate (51) is a square plate with a through hole in the center. A circular hole is set in the center of the square plate. The circular hole is a through hole and matches the bushing (6). Bolt holes are set near the corners of the square plate. The bolt holes are evenly distributed and the distance between the two sides that are close to each other is equal. That is, they are located on the diagonal of the square plate. The end cap (8) is fixed to the lever seat (5) by screws (9). An annular groove is set on the bottom end face of the square plate (51). The center line of the annular groove coincides with the center line of the circular hole. The diameter of the annular groove is larger than the diameter of the circular hole and matches the spring (7). The upper end of the spring (7) is located in the annular groove. The ring wall (52) is circular, with its bottom end connected to the square plate (51). The upper end has end faces of different heights along the circumference of the ring, and the same height in the same circumference. The end face of the upper end of the ring wall (52) is divided into an upper groove (521), a lower groove (522), a slide (523), and a platform (524). The upper groove (521), the slide (523), and the lower groove (522) are connected in sequence to form a set of tracks. There are two sets of tracks at the upper end of the ring wall (52), and the two sets of tracks are symmetrically distributed relative to the center line of the ring wall (52). A platform is set between the two sets of tracks. The end of the crossbar (10) can slide along the track, that is, the lever (4) and the knob (1) rotate, and the lever (4) moves in the up and down direction. The upper groove (521) is a semi-cylindrical surface, and its central axis is perpendicular to the central axis of the ring wall (52). The diameter of the cylindrical surface of the upper groove (521) is equal to the diameter of the crossbar (10). The lower groove (522) is a quarter-cylindrical surface, and its central axis is perpendicular to the central axis of the ring wall. The diameter of the cylinder of the lower groove (522) is equal to the diameter of the crossbar (10). The central axes of the upper groove (521) and the lower groove (522) form a 90° angle with the surface formed by the central axis of the lever seat (5); The slide (523) starts from the high end and ends at the bottom end; the high end is connected to the upper groove (521) and the bottom end is connected to the lower groove (522); The slide rail (523) is smoothly connected to the upper groove (521) and the lower groove (522) respectively; the central axis of the upper groove (521) is consistent with the highest end of the slide rail (523); the lower groove (522) and the slide rail (523) are smoothly connected; The platform (524) is connected to the upper groove (521) and the lower groove (522). The platform (524) is one-quarter of the annular wall (52). Together with the upper groove (521), it defines the highest position of the crossbar (10), so that the knob self-locking device is in the locked state; together with the lower groove (522), it defines the lowest position of the crossbar (10), so that the knob self-locking device is in the initial state. In the initial state, the two ends of the crossbar (10) are located in the lower groove (522) of the two sets of tracks. When the knob (1) is turned, it drives the lever (4) and the crossbar (10) to rotate. The crossbar (10) starts from the position of the upper groove (521) and slides along the slide (523) until it is located in the upper groove (521) of the lever seat (5), thus achieving the locking state. A step (525) is provided in the middle through hole of the ring wall (52). The step (525) is annular and cooperates with the bushing (6) to position the bushing (6). The inner wall of the step (525) is provided with threads, which are threadedly connected and fixed with the bushing (6).

6. The rotary self-locking device for aircraft electronically controlled shutdown according to claim 1, characterized in that, The bushing (6) is a rotating body with an integral structure, including two parts: a circular end (61) and a threaded ring (62), whose center lines coincide. The bushing (6) has a circular through hole in the middle, through which the rod (42) of the lever (4) passes. The two are in clearance fit. The circular through hole of the bushing (6) guides and limits the lever (4) during rotation. The annular end (61) is an annular ring with a circular through hole in the middle; The threaded ring (62) is a ring with threads on its outer circumference. The diameter of the through hole in the middle is equal to the diameter of the through hole at the end of the ring (61). The diameter of the outer circumference of the threaded ring (62) is smaller than the outer diameter of the end of the ring (61). The bushing (6) is located in the step (525) threaded hole of the lever seat (5), and the connection between the bushing (6) and the lever seat (5) is fixed by the thread; The bushing (6) is made of iron-based powder metallurgy material FZ00-01, which has a self-lubricating effect.

7. The rotary self-locking device for aircraft electronically controlled shutdown according to claim 1, characterized in that, The end cap (8) is an integral structure, consisting of a chassis (82) and a protective cover (81), with their center lines coinciding; the chassis (82) is on the lower side and the protective cover (81) is on the upper side; The chassis (82) is a square plate with a through hole in the center. A circular through hole is provided in the center of the square plate. The circular through hole is a through hole and matches the annular wall (52) of the lever seat (5). Bolt holes are provided near the corners. The bolt holes are evenly distributed and the distance between the two sides that are close to each other is equal. They are used to fix the position between the end cap (8) and the lever seat (5). The position of the bolt holes matches the square plate (51). The cover (81) is cylindrical with the opening at the bottom. A lever through hole is provided at the bottom of the cylinder. The lever through hole is a through hole with a size that matches the rod part (42) of the lever (4). The inner diameter of the cylinder of the cover (81) is equal to the diameter of the circular through hole of the chassis (82). The end cap (8) limits the position of the lever (4).

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