An integrated motor clutch for aircraft

Abstract

An integrated motor clutch for aircraft, wherein a driving gear is installed in a lead screw; a rotor nut is installed on the outer circumferential surface of the lead screw. Magnetic steel sheets are evenly distributed on the outer circumferential surface of the rotor nut, and a coil winding is sleeved on the magnetic steel sheets, and a stator is sleeved on the outer circumferential surface of the coil winding. An actuator is sleeved on the lead screw. Two micro switches are installed on the outer circumferential surface of the gear end of the actuator cylinder close to the driving gear. The present invention has a small transmission gap, can achieve high-precision transmission, and has a self-locking function in place; the structure is compact, the clutch mode is flexible, the gap is not restricted, and the structural weight of the aircraft is reduced, fuel is saved; and the taxiing noise of the aircraft is reduced. The working environment temperature range of the present invention is ‑55°C to 120°C, which can meet the various use environment requirements of military aircraft and civil aircraft, and has good adaptability and versatility.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft brake wheels, in particular to an integrated motor clutch for aircraft, the stroke of the motor clutch being 0-42 mm. Background Art

[0002] At present, the clutch of the power system of civil equipment is mainly responsible for disconnecting and connecting the power and the engine (or motor). First, when the engine is started without load, the clutch gradually increases the resistance torque of the engine, overcomes the resistance of the inertia moment of the large power load at the moment of starting, realizes a smooth transition of power, and keeps its speed above the minimum stable speed at all times to avoid stalling and stopping work; secondly, when the motor is loaded and started synchronously, the resistance torque gradually decreases, and its speed increases from 0 to the rated speed to avoid mechanical damage to the equipment caused by impact. At present, the clutch clearance of general clutches is between 0.2 and 3mm, and the transmission torque will have a great impact on the quality / appearance of the clutch. For civil aircraft with ultra-large stroke, that is, the clutch clearance is far greater than 3mm, synchronous clutch in any stop / rotation state, and special equipment, ordinary clutches can no longer meet the requirements.

[0003] Currently, most of the existing patents are in the automotive field, and there are no patents related to integrated motor clutches for long-stroke aircraft.

[0004] A tubular motor clutch is disclosed in the utility model patent with publication number CN209458312U. The tubular motor clutch is provided with an electric push rod and a locking block, so that the clutch can stably and quickly lock the tubular motor. The electric push rod has a greater force than the traditional mechanical structure and a longer service life, which can make the clutch work more stably and have a longer service life. The patent uses a battery for power supply, and the power supply time is short.

[0005] A utility model patent with publication number CN209262118U discloses an automobile electric sliding door motor clutch, which is provided with a housing, an output shaft is fixed in the housing through a bearing, one end of the output shaft extends from the housing, a motor worm wheel is fixed on one side of the housing, the motor worm wheel is coaxial with the output shaft and fixed on the output shaft or the housing through a bearing, a coil is fixed in the housing, an armature fixed by a limit block is provided on the side of the motor worm wheel facing the coil, the armature can slide up and down along the axial direction of the motor worm wheel in the limit block, a brake pad fixed on the output shaft is provided between the armature and the coil, the armature is connected to the motor worm wheel through a spring sheet so that there is a gap between the armature and the brake pad when the coil is not energized. The patent does not mention the driving force that can be provided. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art clutch that cannot meet the requirements of large clutch clearance, light weight and large torque, the present invention proposes an integrated motor clutch for aircraft.

[0007] The present invention comprises a driving gear, an actuating cylinder, a rotor nut, a lead screw, a micro switch and a bearing seat. The middle part of the driving gear is installed in the lead screw through a bearing, and the inner end surface of the gear end of the driving gear is fitted with the outer end surface of one end of the actuating cylinder. The rotor nut is installed on the outer circumferential surface of the lead screw. Nine magnetic steel sheets are evenly distributed on the outer circumferential surface of the rotor nut; the coil winding is sleeved on the magnetic steel sheets, and the stator is sleeved on the outer circumferential surface of the coil winding. The actuating cylinder is sleeved on the largest outer circumferential surface of the lead screw. Two bearings are sleeved on the outer circumferential surface of the rotor nut and are respectively located at the two ends of the coil winding. An end cover is sleeved on the shaft of the driving gear, and the inner surface of the end cover is fitted with the end surface of the actuating cylinder, the end surface of the rotor nut and the end surface of the lead screw. A bearing is sleeved on the gear end of the shaft of the driving gear close to the driving gear. Two micro switches are installed on the outer circumferential surface of the gear end of the actuating cylinder close to the driving gear.

[0008] The bearing seat of the bearing is sleeved on the shaft of the driving gear, and the connecting plate of the bearing seat is fitted with the outer end surface of the other end of the lead screw.

[0009] The inner diameter of the actuator is the same as the outer diameter of the positioning plate of the lead screw. The outer circumferential surface of one end of the actuator has a radially protruding flange for connecting external equipment. Two strip openings are arranged axially on the outer circumferential surface of the actuator near the baffle for placing a micro switch. When the micro switch is placed, a protective cover is fixed on the outer circumferential surface of the actuator housing.

[0010] The radius of the inner arc surface of the magnetic steel sheet is the same as the outer radius of the rotor nut. There are 9 magnetic steel sheets, which are evenly distributed along the circumference of 360°. The arc of each magnetic steel sheet is 35°, the axial length is 20mm, the same as the stator, and the thickness is 3mm calculated according to the output power.

[0011] The inner circumferential surface of the rotor nut is a threaded surface that cooperates with the lead screw. The outer diameter of the rotor nut is the same as the inner diameter of the bearing. There are two radial bosses distributed along the axial direction on the outer circumferential surface in the middle of the rotor nut, and a mounting groove for the magnetic steel sheet is formed between each boss. The radial height of each boss is the same as the thickness of the magnetic steel sheet.

[0012] The driving gear is an integral structure, including a shaft and a gear. The outer diameter of the shaft is smaller than the minimum inner diameter of the lead screw. A gear is provided at one end of the shaft. A stepped surface for mounting a bearing seat is provided on the outer circumferential surface of the shaft near the gear end. The cross section of the gear shaft is a special-shaped structure, and the cross section of the gear shaft is composed of three arcs with a radius of R and three arcs with a radius of r, and the three arcs with a radius of R are connected to the above three arcs with a radius of r at intervals to form an outer contour of the cross section of the gear shaft that is approximately an equilateral triangle. There is a smooth transition between each of the arcs.

[0013] The outer circumferential surface of the lead screw has a threaded surface that matches the rotor nut. One end of the lead screw is open, and the other end is provided with an end plate, and the center of the end plate has a through hole for the drive gear shaft. A radially protruding positioning disk is provided on the outer circumferential surface of the end of the end plate of the lead screw; the outer diameter of the positioning disk is the same as the inner diameter of the actuator cylinder. The mounting holes of the bearing seat are distributed on the positioning disk. An axially protruding annular boss is provided on the outer end surface of the positioning disk, forming a positioning stop of the bearing seat.

[0014] Compared with the prior art, the present invention has the following characteristics:

[0015] 1. The working environment temperature range is -55℃~120℃, which has a wide working environment temperature range and can meet the various use environment requirements of military aircraft and civil aircraft.

[0016] 2. The integrated motor clutch adopts 28VDC power supply, which is consistent with the aircraft configuration power supply, and general general motors can meet the requirements, with good adaptability and versatility.

[0017] 3. Under the condition of providing a driving torque of not less than 7500N.m, the weight of the present invention is only 25Kg, which is about 10% to 20% of the weight of the existing clutch. Aircraft designers strive to reduce every gram, and the trend of lightweight aircraft is very obvious. The use of the present invention reduces the structural weight of the aircraft, saves 30% of fuel, and reduces the taxiing noise of the aircraft from about 110 decibels to about 100 decibels, thereby achieving the design goals of low fuel consumption, low noise, and low pollution of the aircraft, and realizing the purpose of green aviation.

[0018] 4. The effective stroke of the present invention is up to 42mm. When in working state, the driving gear is meshed with the driven equipment to achieve torque transmission; when in non-working state, the driving gear is disengaged from the driven equipment, thereby protecting the driving gear from mechanical impact damage from the driven equipment.

[0019] 5. The engagement / disengagement time of the present invention is no more than 3 seconds, which can achieve rapid engagement and disengagement; and the driving gear is driven by gears, and the transmission gap is small, which can achieve high-precision transmission.

[0020] 6. The present invention adopts a DC motor drive to convert the motor's rotational motion into the linear motion of the lead screw and the driving gear. When the clutch clearance meets the requirements, the micro switch can detect it in time and fix the driving gear at the current position to achieve precise control.

[0021] 7. The present invention has a self-locking function in place, and its friction angle is 0.77°, which is much smaller than the friction angle of steel 8.5°. According to the mechanical self-locking principle, it has the self-locking condition. Its advantage is that it has the self-locking function when the power is off in place, and can complete the reliable transmission of power without external force, so as to maximize the torque transmission efficiency; the external force refers to the common methods in the prior art to keep the power on during operation, liquid pressure maintenance or additional spring.

[0022] 8. In the present invention, the rotor nut and the lead screw are meshed with trapezoidal threads to achieve an integrated design, which reduces the number of connectors and saves installation space. The transmission form of direct motor drive is adopted, and no gear transmission assembly is required, which makes the structure compact and saves installation space. At the same time, a bearing with a small axial size is selected to achieve the purpose of saving installation space.

[0023] 9. Compared with the traditional clutch, the clutch clearance of the present invention is not limited, and the clutch clearance can be changed by adjusting the clearance between the bearing seat and the actuator.

[0024] 10. The clutch mode is flexible and can be used in dry environment. It does not need oil immersion and has good safety and fire resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of an integrated motor clutch for aircraft.

[0026] Figure 2 It is a schematic diagram of the actuator structure.

[0027] Figure 3 yes Figure 2 Side view of.

[0028] Figure 4 Yes Yes Figure 2 A partial view of the .

[0029] Figure 5 It is a schematic diagram of the structure of magnetic steel sheets.

[0030] Figure 6 It is a schematic diagram of the rotor nut structure.

[0031] Figure 7 yes Figure 6 Side view of.

[0032] Figure 8 It is a structural diagram of the bearing seat.

[0033] Fig. 9 yes Figure 8 Side view of.

[0034] Fig.10 It is a schematic diagram of the bearing seat structure.

[0035] Fig.11 yes Fig.10 Side view of.

[0036] Fig.12 It is a structural diagram of the lead screw.

[0037] Fig.13 yes Fig.12 Side view of.

[0038] Fig.14 Schematic diagram of the structure of the protective cover.

[0039] Fig.15 yes Fig.14 Side view of.

[0040] Fig.16 yes Fig.14 Top view of the .

[0041] In the figure: 1. Actuator; 2. Stator; 3. Coil winding; 4. Magnetic steel sheet; 5. Rotor nut; 6. Bearing seat; 7. Driving gear; 8. Lead screw; 9. Bearing; 10. Micro switch; 11. Protective cover. DETAILED DESCRIPTION

[0042] This embodiment is an integrated motor clutch for aircraft, comprising a driving gear 7, an actuating cylinder 1, a lead screw 8, a micro switch 10 and a bearing seat 6. The middle part of the driving gear 7 is mounted in the lead screw 8 through a bearing, and the inner end face of the gear end of the driving gear is fitted with the outer end face of one end of the actuating cylinder 1. The rotor nut 5 is mounted on the outer circumferential surface of the lead screw through a thread. A magnetic steel sheet 4 is mounted on the outer circumferential surface of the rotor nut, and nine magnetic steel sheets are evenly distributed in the circumferential direction and brazed on the rotor nut 5 by low-temperature alloy; the coil winding 3 is mounted on the magnetic steel sheet, and the stator 2 is mounted on the outer circumferential surface of the coil winding. The actuating cylinder 1 is mounted on the largest outer circumferential surface of the lead screw. Two bearings 9 are mounted on the outer circumferential surface of the rotor nut 5 and are respectively located at the two ends of the coil winding. An end cover is mounted on the shaft of the driving gear 7, and the inner surface of the end cover is fitted with the end face of the actuating cylinder 1, the end face of the rotor nut 5 and the end face of the lead screw 8. A bearing is mounted on the gear end of the shaft of the driving gear near the driving gear, and the bearing seat of the bearing is mounted on the shaft of the driving gear, and the connecting plate of the bearing seat is fitted with the outer end surface of the other end of the lead screw. Two micro switches 10 are mounted on the outer circumferential surface of the gear end of the actuator 1 near the driving gear; and a protective cover 11 is mounted on each micro switch.

[0043] The actuator 1 is in the shape of a shell. The inner diameter of the actuator is the same as the outer diameter of the positioning plate of the lead screw 8. The outer circumferential surface of one end of the actuator has a radially protruding flange for connecting with external equipment. Two strip openings are arranged axially on the outer circumferential surface of the actuator near the baffle for placing a micro switch 10. When the micro switch is placed, a protective cover 11 is fixed on the outer circumferential surface of the actuator shell.

[0044] The magnetic steel sheet 4 is an arc-shaped sheet, and the radius of the inner arc surface of the magnetic steel sheet is the same as the outer radius of the rotor nut 5. In this embodiment, there are 9 magnetic steel sheets, which are evenly distributed along the 360° direction of the circumference. The arc of each magnetic steel sheet is 35°, the axial length is 20mm, the same as the stator, and the thickness is 3mm calculated according to the output power.

[0045] The rotor nut 5 is sleeve-shaped. The inner circumferential surface of the rotor nut is a threaded surface that matches the lead screw 8. The outer diameter of the rotor nut is the same as the inner diameter of the bearing 9. There are two radial bosses distributed along the axial direction on the outer circumferential surface in the middle of the rotor nut, and mounting grooves for the magnetic steel sheet 4 are formed between the bosses. The radial height of each boss is the same as the thickness of the magnetic steel sheet.

[0046] The bearing seat 6 is a circular shell, and its inner diameter is the same as the outer diameter of the bearing. A radially protruding connecting plate is provided on the outer circumferential surface of the inner end of the bearing seat, and the outer diameter of the connecting plate is the same as the outer diameter of the end plate of the lead screw 8.

[0047] The driving gear 7 is an integral structure, including a shaft and a gear. The outer diameter of the shaft is smaller than the minimum inner diameter of the lead screw 8. There is a gear at one end of the shaft. There is a stepped surface for mounting the bearing seat 6 on the outer circumferential surface of the shaft near the gear end. The cross section of the gear shaft is a special-shaped structure, and the cross section of the gear shaft is composed of three arcs with a radius of R and three arcs with a radius of r, and the three arcs with a radius of R are connected to the above-mentioned three arcs with a radius of r at intervals to form the outer contour of the gear shaft cross section that is approximately an equilateral triangle. There is a smooth transition between each arc. In this embodiment, R=38.75mm, r=13.5mm.

[0048] The lead screw 8 is sleeve-shaped, and its outer circumferential surface has a threaded surface that matches the rotor nut. One end of the lead screw is open, and the other end is provided with an end plate, and the center of the end plate has a through hole for the shaft of the drive gear 7. A radially protruding positioning disk is provided on the outer circumferential surface of the end of the end plate of the lead screw; the outer diameter of the positioning disk is the same as the inner diameter of the actuator 1. The mounting holes of the bearing seat 6 are distributed on the positioning disk. An axially protruding annular boss is provided on the outer end surface of the positioning disk, forming a positioning stop of the bearing seat.

[0049] The protective cover 11 is groove-shaped and is made of metal plate. The outer surface of the groove has a fixing tab. The width of the groove is slightly larger than the length of the strip opening on the actuator 1, and the height of the groove is larger than the height of the micro switch 10 after installation.

[0050] The existing clutch does not have an extra-large clearance. The integrated motor clutch for aircraft proposed in the present invention converts the motor's rotational motion into linear motion by designing a rotor nut and a screw structure on the basis of the existing clutch, thereby realizing the function of the clutch's extra-large stroke. The integrated motor clutch for aircraft proposed in the present invention has a clutch clearance of 42mm.

[0051] When the motor is powered on, the rotor nut drives the lead screw to move, and moves synchronously with the driving gear fixed to the lead screw. The micro switch controls the driving gear and the power load to engage reliably. After being in place, the lead screw completes self-locking to ensure the safety of the engagement between the engine and the power during operation. The engine outputs torque through the driving gear to realize the power transmission function.

[0052] By changing the motor rotation direction and the micro switch contact distance, the engine and power engagement, separation and different clutch clearance requirements can be met.

Claims

1. An integrated motor clutch for an aircraft, characterized in that: Including drive gear, actuator, rotor nut, screw The invention relates to a screw rod, a micro switch and a bearing seat; wherein the middle part of the driving gear is installed in the lead screw through a bearing, and the inner end face of the gear end of the driving gear is fitted with the outer end face of one end of the actuating cylinder; the rotor nut is installed on the outer circumferential surface of the lead screw; nine magnetic steel sheets are evenly distributed on the outer circumferential surface of the rotor nut; the coil winding is sleeved on the magnetic steel sheet, and the stator is sleeved on the outer circumferential surface of the coil winding; the actuating cylinder is sleeved on the largest outer circumferential surface of the lead screw; two bearings are sleeved on the outer circumferential surface of the rotor nut and are respectively located at the two ends of the coil winding; an end cover is sleeved on the shaft of the driving gear, and the inner surface of the end cover is fitted with the end face of the actuating cylinder, the end face of the rotor nut and the end face of the lead screw; a bearing is sleeved on the gear end of the shaft of the driving gear close to the driving gear; two micro switches are installed on the outer circumferential surface of the gear end of the actuating cylinder close to the driving gear; The bearing seat of the bearing is sleeved on the shaft of the driving gear, and the connecting plate of the bearing seat is fitted with the outer end surface of the other end of the lead screw; The inner diameter of the actuator cylinder is the same as the outer diameter of the positioning plate of the screw; the outer circumferential surface of one end of the actuator cylinder is provided with a radially protruding flange for connecting external equipment; two strip openings are axially arranged on the outer circumferential surface of the actuator cylinder close to the baffle for accommodating a micro switch; when the micro switch is placed, a protective cover is fixed on the outer circumferential surface of the actuator cylinder housing.

2. The integrated motor clutch for aircraft as claimed in claim 1, characterized in that: The radius of the inner arc surface of the magnetic steel sheet is the same as the outer radius of the rotor nut; there are 9 magnetic steel sheets, evenly distributed along the 360° direction of the circumference; the arc of each magnetic steel sheet is 35°, the axial length is 20mm, the same as the stator, and the thickness is 3mm calculated according to the output power.

3. The integrated motor clutch for aircraft as claimed in claim 1, characterized in that: The inner circumferential surface of the rotor nut is a threaded surface that cooperates with the screw; the outer diameter of the rotor nut is the same as the inner diameter of the bearing; the outer circumferential surface in the middle part of the rotor nut has two radial bosses distributed along the axial direction, and mounting grooves for the magnetic steel sheet are formed between the bosses; the radial height of each boss is the same as the thickness of the magnetic steel sheet.

4. The integrated motor clutch for aircraft as claimed in claim 1, characterized in that: The driving gear is an integral structure, including a shaft and a gear; the outer diameter of the shaft is smaller than the minimum inner diameter of the lead screw; a gear is provided at one end of the shaft; a stepped surface for installing a bearing seat is provided on the outer circumferential surface of the shaft near the gear end; the cross section of the gear shaft is a special-shaped structure, the cross section of the gear shaft is composed of three arcs with a radius of R and three arcs with a radius of r, and the three arcs with a radius of R are connected to the above-mentioned three arcs with a radius of r at intervals to form an outer contour of the gear shaft cross section that is approximately an equilateral triangle; and there is a smooth transition between each of the arcs.

5. The integrated motor clutch for aircraft as claimed in claim 1, characterized in that: The outer circumferential surface of the lead screw has a threaded surface that cooperates with the rotor nut; one end of the lead screw is open, and an end plate is provided at the other end, and a through hole for the driving gear shaft is provided at the center of the end plate; a radially protruding positioning plate is provided on the outer circumferential surface of the end of one end of the end plate of the lead screw; the outer diameter of the positioning plate is the same as the inner diameter of the actuator cylinder; the mounting holes of the bearing seat are distributed on the positioning plate; an axially protruding annular boss is provided on the outer end surface of the positioning plate, forming a positioning stop of the bearing seat.

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