Large-stroke high-reliability dual-redundancy angular displacement sensor

Abstract

The invention relates to the technical field of electromagnetic angular displacement sensors, in particular to a large-stroke high-reliability dual-redundancy angular displacement sensor. Comprising a shell, a rear cover, a speed reducer component and a dual-redundancy RVDT component. The shell is a cylinder, the shell is a supporting part of the whole sensor, the speed reducer component and the dual-redundancy RVDT component are connected and fastened together, the rear cover is screwed on the shell, and the speed reducer component and the dual-redundancy RVDT component in the sensor are isolated from the external environment; the speed reducer component comprises an output shaft gear, a lower supporting frame, a five-stage speed reduction gear and an upper supporting frame. The output shaft gear and the five-stage reduction gear are clamped together through the lower supporting frame and the upper supporting frame to form a speed reducer component, and the upper supporting frame and the lower supporting frame respectively support the two ends of each stage of reduction gear through bearings and are used for rotation of each stage of gear; in order to save space, the five-stage reduction gears are compactly distributed in a stepped mode along the involute. The fifth-stage reduction gear is connected with a rotor part of the dual-redundancy RVDT part in a key and double-thread sleeve locking mode, and axial rotation decelerated by the speed reducer part is transmitted to the rotor part of the dual-redundancy RVDT part; the dual-redundancy RVDT component is installed in an RVDT positioning hole in the upper supporting frame, a shell of the dual-redundancy RVDT component and the upper supporting frame are locked through screws, and the dual-redundancy RVDT component is fastened through the upper supporting frame.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic angular displacement sensors, and in particular to a large-stroke, high-reliability, dual-redundancy angular displacement sensor. Background Art

[0002] The control system requires electromagnetic angular displacement sensors to have long-stroke feedback, among which dual-redundant long-stroke angular displacement sensors are more common. The maximum measurement stroke of conventional electromagnetic angular displacement sensors is ±40°. As the requirements of aircraft for angle measurement stroke are getting larger and larger (the measurement stroke requirement is not less than ±8425°), the measurement stroke of conventional angular displacement sensors can no longer meet the requirements of long-stroke measurement, so that their application in aircraft is very limited; and the control system has high requirements for the reliability of sensors, and the development of high-reliability reduction structures is required. Compared with other reduction mechanisms, multi-stage reduction gears have higher reliability and provide a feasible solution for the high-reliability development of long-stroke sensors. Summary of the invention

[0003] The purpose of the present invention is to provide a dual-redundancy angular displacement sensor with a large stroke and high reliability, so as to solve the problem that the conventional dual-redundancy angular displacement sensor has a small measuring stroke and limited use occasions.

[0004] Technical solution of the present invention:

[0005] Provide a large-stroke, high-reliability dual-redundancy angular displacement sensor, including: a housing, a rear cover, a reducer component, and a dual-redundancy RVDT component;

[0006] The outer shell is a cylinder, which is the supporting part of the entire sensor, connecting and fastening the reducer component and the double-redundant RVDT component together. The rear cover is screwed onto the outer shell to isolate the reducer component and the double-redundant RVDT component inside the sensor from the external environment.

[0007] The reducer components include an output shaft gear, a lower support frame, a five-stage reduction gear, and an upper support frame;

[0008] The lower support frame and the upper support frame clamp the output shaft gear and the five-stage reduction gear together to form a reducer component. The upper support frame and the lower support frame respectively support the two ends of each stage of the reduction gear through bearings for the rotation of each stage of the gear; the five-stage reduction gear is distributed radially along an involute pattern and axially in a stepped pattern, which maximizes the transmission ratio of the reducer component in a limited space; the fifth-stage reduction gear is connected to the rotor component of the double-redundant RVDT component by a key and a double-screw locking method, and the axial rotation after deceleration by the reducer component is transmitted to the rotor component of the double-redundant RVDT component;

[0009] The double-redundant RVDT component is installed in the RVDT positioning hole on the upper support frame. The housing of the double-redundant RVDT component is locked with the upper support frame by screws, and the upper support frame fastens the double-redundant RVDT component.

[0010] Further, the double-redundant RVDT components include an RVDT housing, two RVDT windings, an isolation cover, a rotor component, a bearing end cover, an end cover spiral ring, and an RVDT rear cover;

[0011] The double-redundant RVDT component is a series double-redundant structure. The two RVDT windings are axially installed in the housing of the double-redundant RVDT component, and an isolation cover is installed between the two RVDT windings; a set of cables are respectively led out of the two RVDT windings, and each set of cables is composed of a power signal line and an output signal line of the winding unit; there are two sets of rotor laminations on the rotor component, which correspond to the two RVDT windings respectively, forming two RVDT components with independent functions; the double-redundant RVDT housing and the bearing end cover provide support for the rotor component through the bearing; the end cover spiral ring and the back cover axially lock the bearing end cover.

[0012] Furthermore, the lower support frame and the upper support frame are fastened by riveting through three connecting columns.

[0013] Furthermore, there are five bearing chambers on the lower support frame, which respectively provide support for the output shaft gear, the first stage reduction gear, the second stage reduction gear, the third stage reduction gear, and the fourth stage reduction gear;

[0014] The upper support frame is provided with four bearing chambers and an RVDT positioning hole, which respectively provide support for a first-stage reduction gear, a second-stage reduction gear, a third-stage reduction gear, a fourth-stage reduction gear, and a double-redundant RVDT component.

[0015] Furthermore, the output shaft gear passes through the lower support frame through a double-bearing support form, is connected to the upper mechanism through gear meshing on the outside, and is connected to the first-stage reduction gear through gear meshing on the inside, thereby transmitting the movement of the upper mechanism to the first-stage reduction gear.

[0016] Furthermore, the first-stage reduction gear includes a large gear meshed with the output shaft gear and a small gear meshed with the second-stage reduction gear; the second-stage reduction gear includes a large gear meshed with the first-stage reduction gear and a small gear meshed with the third-stage reduction gear; the third-stage reduction gear includes a large gear meshed with the second-stage reduction gear and a small gear meshed with the fourth-stage reduction gear; the fourth-stage reduction gear includes a large gear meshed with the third-stage reduction gear and a small gear meshed with the fifth-stage reduction gear.

[0017] Furthermore, the third-stage reduction gear, the large gear of the fourth-stage reduction gear, and the fifth-stage gear adopt a double-tooth backlash elimination structure.

[0018] Furthermore, the side of the lower support frame is provided with three countersunk screw holes for fastening the lower support frame to the housing.

[0019] The invention has the advantages that the dual-redundancy angular displacement sensor realizes the integration of a large transmission ratio reducer and a dual-redundancy RVDT component, so that the sensor has a larger measuring stroke, a smaller volume and a higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The schematic cross-sectional view of a large-stroke, high-reliability, dual-redundancy angular displacement sensor.

[0021] Among them, 1-housing, 2-rear cover, 3-output shaft gear, 4-lower support frame, 5-first stage reduction gear, 6-second stage reduction gear, 7-third stage reduction gear, 8-fourth stage reduction gear, 9-fifth stage reduction gear, 10-upper support frame, 11-double redundant RVDT components.

[0022] Figure 2 It is a structural diagram of dual redundant RVDT components.

[0023] Among them, 111 is a rotor component, 112 is a double-redundant RVDT component housing, 113 is a RVDT winding, 114 is an isolation cover, 115 is a bearing end cover, 116 is an end cover screw ring, and 117 is a RVDT back cover.

[0024] Figure 3 It is a schematic diagram of the structure of the third-stage reduction gear. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the calculation method in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0026] like Figure 1 As shown, a large-stroke high-reliability dual-redundancy angular displacement sensor comprises: a housing 1, a rear cover 2, a reducer component, and a dual-redundancy RVDT component 11; the housing is a cylinder, which is a supporting part of the entire sensor, and connects and fastens the reducer component and the dual-redundancy RVDT component together; the rear cover is tightened on the housing to isolate the reducer component and the dual-redundancy RVDT component inside the sensor from the external environment; the gear component comprises an output shaft gear 3, a lower support frame 4, a first-stage reduction gear 5, a second-stage reduction gear 6, a third-stage reduction gear 7, a fourth-stage reduction gear 8, a fifth-stage reduction gear 9, and an upper support frame 10; Figure 2As shown, the dual-redundancy RVDT components include an RVDT housing, two RVDT windings, an isolation cover, a rotor component, a bearing end cover, an end cover spiral ring, an RVDT rear cover, etc.

[0027] Preferably, the lower support frame and the upper support frame clamp the output shaft gear and the five-stage reduction gear together to form a gear component, and the upper support frame and the lower support frame are respectively supported by bearings at both ends of each stage of the reduction gear for the rotation of each stage of the gear.

[0028] Preferably, the five-stage reduction gears are distributed radially along an involute pattern and axially in a stepped pattern, thereby maximizing the transmission ratio of the reducer components in a limited space.

[0029] Preferably, the lower support frame and the upper support frame clamp the output shaft gear and the five-stage reduction gear together to form a gear component, and the upper support frame and the lower support frame are respectively supported by bearings at both ends of each stage of the reduction gear for the rotation of each stage of the gear.

[0030] Preferably, the lower support frame and the upper support frame are fastened by riveting through three connecting columns.

[0031] Preferably, there are five bearing chambers on the lower support frame, which respectively provide support for the output shaft gear, the first stage reduction gear, the second stage reduction gear, the third stage reduction gear, and the fourth stage reduction gear.

[0032] Preferably, the upper support frame is provided with four bearing chambers and one RVDT positioning hole, which respectively provide support for the first-stage reduction gear, the second-stage reduction gear, the third-stage reduction gear, the fourth-stage reduction gear, and the double-redundant RVDT component.

[0033] Preferably, the output shaft gear passes through the lower support frame through a double bearing support form, is connected to the upper mechanism through gear meshing on the outside, and is connected to the first-stage reduction gear through gear meshing on the inside, so as to transmit the movement of the upper mechanism to the first-stage reduction gear.

[0034] Preferably, the first-stage reduction gear includes a large gear meshed with the output shaft gear and a small gear meshed with the second-stage reduction gear; the second-stage reduction gear includes a large gear meshed with the first-stage reduction gear and a small gear meshed with the third-stage reduction gear; the third-stage reduction gear includes a large gear meshed with the second-stage reduction gear and a small gear meshed with the fourth-stage reduction gear; the fourth-stage reduction gear includes a large gear meshed with the third-stage reduction gear and a small gear meshed with the fifth-stage reduction gear.

[0035] Preferably, the third-stage reduction gear, the large gear of the fourth-stage reduction gear, and the fifth-stage gear adopt a double-tooth backlash elimination structure.

[0036] Preferably, the double-redundant RVDT component is installed in the RVDT positioning hole on the upper support frame, the housing of the double-redundant RVDT component and the upper support frame are locked by screws, and the upper support frame fastens the double-redundant RVDT component.

[0037] Preferably, the double-redundant RVDT component is a series double-redundant structure, the two RVDT windings are axially installed in the housing of the double-redundant RVDT component, and an isolation cover is installed between the two RVDT windings; a group of cables are respectively led out of the two RVDT windings, and each group of cables is composed of a power signal line and an output signal line of the winding unit; there are two groups of rotor laminations on the rotor component, corresponding to the two RVDT windings respectively, forming two RVDT components with independent functions; the housing and the bearing end cover of the double-redundant RVDT component provide support for the rotor component through the bearing; the end cover spiral ring and the rear cover axially lock the bearing end cover.

[0038] Preferably, the fifth stage reduction gear is connected to the rotor component of the double-redundant RVDT component by means of a key and a double screw sleeve locking method, so as to transmit the axial motion after being reduced speed by the gear component to the rotor component of the double-redundant RVDT component.

[0039] Preferably, the side surface of the lower support frame is provided with three countersunk screw holes for fastening the lower support frame to the housing.

[0040] Example 1

[0041] The present invention provides a large-stroke, high-reliability, dual-redundancy angular displacement sensor. Figure 1 As shown, including:

[0042] The lower support frame and the upper support frame clamp the output shaft gear and the five-stage reduction gear together to form a gear component. The upper support frame and the lower support frame respectively support the two ends of each stage of the reduction gear through bearings for the rotation of each stage of the gear. Among them, the five-stage reduction gear is distributed radially along the involute type and axially in a stepped distribution, which maximizes the transmission ratio of the reducer component in a limited space.

[0043] The lower support frame and the upper support frame are fastened by riveting through three connecting columns. There are five bearing chambers on the lower support frame, which provide support for the output shaft gear, the first stage reduction gear, the second stage reduction gear, the third stage reduction gear, and the fourth stage reduction gear respectively. There are four bearing chambers and an RVDT positioning hole on the upper support frame, which provide support for the first stage reduction gear, the second stage reduction gear, the third stage reduction gear, the fourth stage reduction gear, and the double-redundant RVDT components respectively. The output shaft gear passes through the lower support frame in the form of double bearing support, is connected to the upper mechanism through gear meshing on the outside, and is connected to the first stage reduction gear through gear meshing on the inside, so as to transmit the movement of the upper mechanism to the first stage reduction gear.

[0044] The first-stage reduction gear includes a large gear meshed with the output shaft gear and a small gear meshed with the second-stage reduction gear; the second-stage reduction gear includes a large gear meshed with the first-stage reduction gear and a small gear meshed with the third-stage reduction gear; the third-stage reduction gear includes a large gear meshed with the second-stage reduction gear and a small gear meshed with the fourth-stage reduction gear; the fourth-stage reduction gear includes a large gear meshed with the third-stage reduction gear and a small gear meshed with the fifth-stage reduction gear.

[0045] In this embodiment, the number of teeth of the large gears in the first to fourth stage reduction gears is 35, 42, 42, 49 respectively, the number of teeth of the fifth stage reduction gear is 56, and the number of teeth of the small gears at each stage is 14. It can be calculated that the transmission ratios of each stage are 2.5, 3, 3, 3.5 and 4 respectively, then the total transmission ratio of the five-stage gear reduction mechanism is 2.5*3*3*3.5*4=315, and the large angle displacement of the measured object ±8425° is finally converted into the maximum working linear range of ±26.7° of the RVDT. The double-redundant RVDT component is installed in the RVDT positioning hole on the upper support frame, and the housing of the double-redundant RVDT component is locked with the upper support frame by screws, and the upper support frame fastens the double-redundant RVDT component. The fifth stage reduction gear is connected to the rotor component of the double-redundant RVDT component by a key and a double screw sleeve locking method, and the axial motion after the gear component is decelerated is transmitted to the rotor component of the double-redundant RVDT component. There are three countersunk screw holes on the side of the lower support frame for fastening the lower support frame to the housing.

[0046] Example 2

[0047] In the present invention, the third stage reduction gear, the large gear of the fourth stage reduction gear and the fifth stage gear adopt a double-piece tooth clearance elimination structure. Figure 3 The third-stage reduction gear structure shown includes 1-pinion, 2, 3, 6-double-tooth anti-backlash structure, 4-baffle, 5-shaft sleeve and 7-key. The remaining reduction gear structures are similar, and the fifth-stage reduction gear does not include a pinion.

[0048] The double-tooth anti-backlash structure consists of two large gears with the same number of teeth and modulus and a spring between them. There are holes for fixing the springs on both large gears. The springs provide elastic force for the misaligned teeth of the double-tooth while connecting the double-tooth, thereby achieving the effect of anti-backlash. In the third-stage reduction gear and the fourth-stage reduction gear, the double-tooth anti-backlash structure is connected to the pinion shaft through a key, transmitting the rotation of the upper mechanism to the single-piece pinion, and the pinion transmits the axial rotation to the lower mechanism. The pinion shaft is fastened to the sleeve through a thread and is installed in the bearing chamber of the lower support frame with the sleeve. The baffle is located between the sleeve and the double-tooth anti-backlash structure, and together with the pinion, it axially locks the double-tooth anti-backlash structure.

[0049] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A long-travel, high-reliability, dual-redundancy angular displacement sensor, characterized in that: include: Housing, back cover, reducer components, double-redundant RVDT components; The outer shell is a cylinder, which is the supporting part of the entire sensor, connecting and fastening the reducer component and the double-redundant RVDT component together. The rear cover is screwed onto the outer shell to isolate the reducer component and the double-redundant RVDT component inside the sensor from the external environment. The reducer components include an output shaft gear, a lower support frame, a five-stage reduction gear, and an upper support frame; The lower support frame and the upper support frame clamp the output shaft gear and the five-stage reduction gear together to form a reducer component. The upper support frame and the lower support frame respectively support the two ends of each stage of the reduction gear through bearings for the rotation of each stage of the gear; the five-stage reduction gear is distributed radially along an involute pattern and axially in a stepped pattern, which maximizes the transmission ratio of the reducer component in a limited space; the fifth-stage reduction gear is connected to the rotor component of the double-redundant RVDT component by a key and a double-screw locking method, and the axial rotation after deceleration by the reducer component is transmitted to the rotor component of the double-redundant RVDT component; The double-redundant RVDT component is installed in the RVDT positioning hole on the upper support frame. The housing of the double-redundant RVDT component is locked with the upper support frame by screws, and the upper support frame fastens the double-redundant RVDT component.

2. The long-stroke, high-reliability, dual-redundancy angular displacement sensor according to claim 1, characterized in that: The components of the dual-redundancy RVDT include the RVDT housing, two RVDT windings, an isolation cover, a rotor component, a bearing end cover, an end cover spiral ring, and a RVDT rear cover; The double-redundant RVDT component is a series double-redundant structure. The two RVDT windings are axially installed in the housing of the double-redundant RVDT component, and an isolation cover is installed between the two RVDT windings; a set of cables are respectively led out of the two RVDT windings, and each set of cables is composed of a power signal line and an output signal line of the winding unit; there are two sets of rotor laminations on the rotor component, which correspond to the two RVDT windings respectively, forming two RVDT components with independent functions; the double-redundant RVDT housing and the bearing end cover provide support for the rotor component through the bearing; the end cover spiral ring and the back cover axially lock the bearing end cover.

3. The long-stroke, high-reliability, dual-redundancy angular displacement sensor according to claim 2, characterized in that: The lower support frame and the upper support frame are fastened by riveting through three connecting columns.

4. The long-stroke, high-reliability, dual-redundancy angular displacement sensor according to claim 2, characterized in that: There are five bearing chambers on the lower support frame, which provide support for the output shaft gear, the first stage reduction gear, the second stage reduction gear, the third stage reduction gear, and the fourth stage reduction gear respectively; The upper support frame is provided with four bearing chambers and an RVDT positioning hole, which respectively provide support for a first-stage reduction gear, a second-stage reduction gear, a third-stage reduction gear, a fourth-stage reduction gear, and a double-redundant RVDT component.

5. The long-stroke, high-reliability, dual-redundancy angular displacement sensor according to claim 2, characterized in that: The output shaft gear passes through the lower support frame through a double-bearing support form, is connected to the upper mechanism through gear meshing on the outside, and is connected to the first-stage reduction gear through gear meshing on the inside, transmitting the movement of the upper mechanism to the first-stage reduction gear.

6. The long-stroke, high-reliability, dual-redundancy angular displacement sensor according to claim 5, characterized in that: The first-stage reduction gear includes a large gear meshed with the output shaft gear and a small gear meshed with the second-stage reduction gear; the second-stage reduction gear includes a large gear meshed with the first-stage reduction gear and a small gear meshed with the third-stage reduction gear; the third-stage reduction gear includes a large gear meshed with the second-stage reduction gear and a small gear meshed with the fourth-stage reduction gear; the fourth-stage reduction gear includes a large gear meshed with the third-stage reduction gear and a small gear meshed with the fifth-stage reduction gear.

7. The long-stroke, high-reliability, dual-redundancy angular displacement sensor according to claim 6, characterized in that: The third stage reduction gear, the large gear of the fourth stage reduction gear and the fifth stage gear adopt a double-piece tooth anti-backlash structure.

8. The long-stroke, high-reliability, dual-redundancy angular displacement sensor according to claim 1, characterized in that: There are three countersunk screw holes on the side of the lower support frame for fastening the lower support frame to the housing.

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