JP2001074121A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have an effective jamming resistance function and drive a driven portion without occurrence of large fluctuations in speed and driving force for driving a steering surface, even if jamming occurs. SOLUTION: Power from a driving source 1 is divided into two by a differential gear mechanism 3, rotation of a driving shaft 5 and a driving shaft 6 is input to a reduction mechanism 8 incorporating planetary gear mechanism 11 and a reduction mechanism 9 incorporating planetary gear mechanism 12. A fixed sun gear portion 17 of the reduction mechanism 8 is fixed to a fixing portion 7, a rotation output portion 14 is connected to a fixed sun gear portion 18 by a connecting portion 10, and a rotation output portion 15 of the reduction gear 9 is connected with a steering surface 16 to be driven. In the constitution, driving force of two power transmission paths is added to driving load in a normal state. Even if sticking occurred in one of mechanism of the power transmission paths, the other power transmission path can drive load to constitute a power transmission path including the sticking portion in a state where one of the power transmission path is sticking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device having an effective anti-jamming mechanism in, for example, a drive system for a control surface of an aircraft control system.

[0002]

2. Description of the Related Art Aircraft control involves changing the shape of a part of an aircraft during flight to generate aerodynamic forces (lift, drag, etc.).
It raises, lowers, and changes direction by generating moments that change the attitude of the aircraft. The part that changes the shape of the fuselage is called a control surface. Usually, these control surfaces are horizontal tails,
A plurality of vertical tails and main wings are provided.Operation signals are transmitted to related control surfaces via a controller in accordance with pilot operation, and a power transmission device that displaces the control surfaces following the signals is driven. Then, the control surface is displaced to an angle corresponding to the operation signal, the aerodynamic force is generated, the attitude of the aircraft is changed, and operations such as ascent, descent, and azimuth change are performed. Servo actuators are usually used to displace the control surfaces,
Since the actuator must follow the signal of the controller with good responsiveness against the aerodynamic force acting on the control surface, a hydraulic servo actuator that can generate a large output and has excellent responsiveness has been used. However, the use of hydraulic pressure increases the weight, such as the need for a hydraulic pressure source and the need for hydraulic oil piping.

On the other hand, recently, small-sized, lightweight, high-output, high-performance electric motors have been developed, and studies are underway to replace the hydraulic servo actuator with an electric servo actuator that does not use hydraulic pressure. This type of electric servo actuator is generally configured so that the power of the electric motor acts on the control surface via a speed reducer. However, when jamming occurs on the transmission path, the steering angle cannot be changed. , Which could lead to fatal accidents in aircraft. In view of such a problem, conventionally, in order to prevent uncontrollability due to jamming, a plurality of drive sources have been proposed so that operation can be continued in another system even if a part of the drive source is jammed.

[0004]

As a conventional countermeasure for jamming, a method of dividing or separating a power transmission path has been adopted. Usually, either a so-called clutch system or a shear section system for separating the jamming portion, or a planetary gear mechanism or a differential gear mechanism for dividing a power transmission path is employed. However, the former method has a disadvantage that it is difficult to set the release torque. Further, the latter method has a disadvantage that the output (speed and driving force) greatly changes during jamming as compared with the normal operation. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a power transmission device that has an effective anti-jamming function and has less fluctuation in output.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, a power transmission device of the present invention drives the load by increasing or decreasing the speed of rotation or linear motion of a power source to the load side. In the power transmission device, two or more transmission paths for increasing or decreasing the power and transmitting the power are arranged in parallel, and in a normal state, the driving force from all the transmission paths is added to drive the load, and one transmission is performed. When the path is abnormal, the remaining transmission paths are configured to be the power transmission paths with the abnormal transmission path as it is. Further, the power transmission device of the present invention,
In a power transmission device for driving a load by increasing or decreasing the power of rotation or linear motion of a power source, a drive system including a transmission path for increasing or decreasing the speed and transmitting the power is provided.
The load is driven by one drive system when normal, and when one drive system is abnormal, it is switched to another power source and the transmission path in the abnormal drive system is kept as it is. It is configured to be included in the power transmission path in the state of.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a configuration of an example of a power transmission device (hereinafter, referred to as the present device) provided by the present invention, and FIG. 2 is a perspective view showing a conceptual configuration of the present invention. In FIG. 1, the present apparatus includes a drive source (a prime mover such as an electric motor) 1, a driven transmission mechanism 2, and a reduction mechanism 8 connected to a drive shaft 5 and a drive shaft 6 which are two output shafts of the driven transmission mechanism 2. And a speed reduction mechanism 9. Further, the speed reduction mechanism 8 includes two arms 13a and 13b for fixing the apparatus and the driven unit 16 to the fixing unit 7. Further, the speed reduction mechanism 8
The speed reduction mechanism 9 is connected to the speed reduction mechanism 9 by a connection portion 10 so that the respective outputs are added. The driven part 16 is connected to the rotation output part 15 of the reduction mechanism 9.

The shaft 19 of the drive source 1 serves as an input shaft of the differential gear mechanism 3 of the driven transmission mechanism 2 including the differential gear mechanism 3 and the transmission gears 4a and 4b. The input driving force is split into two power transmission paths by the differential gear mechanism 3, one of which is transmitted to the drive shaft 5, which is the input shaft of the reduction mechanism 8, via the transmission gear 4 a. 11a, the planetary gears 11b and 11d, the fixed sun gear 11c, and the speed reduced by the planetary gear mechanism 11 composed of the driven sun gear 11e, output to the rotation output unit 14 connected to the driven sun gear 11e, and It is connected to the fixed sun gear portion 18 of the speed reduction mechanism 9 via the transmission. The fixed sun gear portion 17 of the speed reduction mechanism 8 is fixed to the fixed portion 7 outside the apparatus by, for example, an airframe structural member of an aircraft by arms 13a and 13b shown in FIG. On the other hand, the driving force transmitted to the drive shaft 6 as the input shaft of the reduction mechanism 9 via the transmission gear 4b is
a, the rotation output unit 1 that is reduced in speed by the planetary gear mechanism 12 including the planetary gears 12b and 12d, the fixed sun gear 12c, and the driven sun gear 12e and is connected to the driven sun gear 12e.
5, from the rotation output unit 14 of the speed reduction mechanism 8 to the connection unit 1
The output is added to the displacement input to the fixed sun gear portion 18 of the speed reduction mechanism 9 through the output portion 0, and is output to drive the connected driven portion (control surface) 16.

FIG. 2 is a conceptual perspective view showing the shape of the above-described apparatus. The driving force of the driving source 1 is applied to the driven transmission mechanism 2 and is branched to the driving shaft 5 and the driving shaft 6. The driving force input from the drive shaft 5 to the speed reduction mechanism 8 is reduced by the speed reduction mechanism 8, output to the rotation output unit 14, and connected to the speed reduction mechanism 9 via the connection unit 10. The driving force input from the drive shaft 6 to the speed reduction mechanism 9 is decelerated by the speed reduction mechanism 9, added to the output of the speed reduction mechanism 8, output to the rotation output unit 15, and connected to a driven part (steering unit) outside the apparatus. Surface 16 is driven.

Next, the operation of the present apparatus will be described with reference to FIGS. FIG. 3 shows the transmission path of the driving force of the above-described apparatus, and FIG. 4 shows the rotations A and B of the shaft 17, the driving shaft 5, the driving shaft 6, the rotation output unit 14, and the rotation output unit 15 shown in FIG. , C, D, and E. During normal operation, the rotation (A) of the shaft 17 is branched into two paths, and if the reduction ratio is not taken, the rotations of the shaft 17 remain unchanged as the drive shaft 5 (B) and the drive shaft 6
The rotation transmitted to (C) and reduced by the reduction mechanism 8 (D)
Is output to the rotation output unit 14 of the speed reduction mechanism 8 and input to the speed reduction mechanism 9. The rotation input (C) of the speed reduction mechanism 9 is decelerated by the speed reduction mechanism 9 and added to the above (D), and the rotation output unit 15
(E) to drive the driven part 16.

The reduction ratio between the reduction mechanism 8 and the reduction mechanism 9 is b / a
During normal operation, the rotation output b of the speed reduction mechanism 9 is added to the rotation output b of the speed reduction mechanism 8, and a rotation output of about 2b or 2b is output to the rotation output unit 14 of the speed reduction mechanism 9.
Next, when jamming (sticking) occurs in the path of the speed reduction mechanism 8, the rotation (B) of the drive shaft 5 becomes zero, and therefore, the rotation (D) of the rotation output unit 14 also becomes zero. In this case, when the transmission gear 4a is stopped in the differential gear mechanism 3 in the driven gear mechanism 2 in FIG. 1, the rotation (C) of the drive shaft 6 is doubled to 2a, and the rotation output (E ) Becomes 2b. Next, when jamming (sticking) occurs in the path of the speed reduction mechanism 9, rotation (C) of the drive shaft 6 is performed.
Becomes zero. In this case, when the transmission gear 4b is stopped in the differential gear mechanism 3 in the driven gear mechanism 2 of FIG. 1, the rotation (B) of the drive shaft 5 is doubled to 2a, and the rotation output unit 14 of the reduction mechanism 8 (D) is 2b, and the speed reduction mechanism 9 without rotation of the drive shaft is driven together with the speed reduction mechanism 8 and the rotation (E) of the rotation output unit 15 is also 2b.

Next, the state of the rotational displacement of the driven portion (control surface) 16 corresponding to the state of FIG. 4 will be described with reference to FIGS. 1, 5, 6, and 7. FIG. 5 shows that the apparatus is in a normal state, and when the rotational displacement of the shaft 19 of the drive source 1 in FIG. 1 is a, the rotational displacement of the reduction mechanism 8 with respect to the fixed part 7 is b, and the displacement of the reduction mechanism 8 is on the axis. Is also b. Therefore, the driven portion (control surface) 1 with respect to the rotation center of the reduction mechanism 8 (the rotation center with respect to the fixed portion 7).
Although the rotational displacement of 6 is smaller than 2b, it approaches 2b as long as the magnitude of Y with respect to X is sufficiently large. FIG. 6 shows a case in which the system of the speed reduction mechanism 8 is jammed, and the rotation displacement of the rotation output unit 15, that is, the control surface 16 with respect to the rotation center of the speed reduction mechanism 9 is 2 b, but the rotation displacement of the speed reduction mechanism 8 with respect to the fixed unit 7 from the rotation center is small. Although the rotational displacement is smaller than 2b, it approaches 2b as long as the magnitude of Y with respect to X is sufficiently large. FIG. 7 shows a case where the system of the speed reduction mechanism 9 is jammed, and the rotational displacement 2b of the speed reduction mechanism 8 with respect to the fixed portion 7 is
6 is obtained.

As described above, in this apparatus, X
Is large enough so that even if jamming occurs in either system of the speed reduction mechanism 8 and the speed reduction mechanism 9, the control surface 1
6 can realize a power transmission mechanism whose rotational displacement is not largely changed. Further, even if jamming occurs in any of the systems of the speed reduction mechanism 8 and the speed reduction mechanism 9, a power transmission mechanism in which the driving force does not fluctuate can be realized. The above description is an example in which the speed reduction mechanism 8 and the speed reduction mechanism 9 are configured X apart from each other.
By using a coaxial arrangement in which X is set to zero as much as possible, a power transmission device that can be driven without fluctuation in both the rotation speed and the displacement of the driven unit 16 even when one system jams can be realized. Further, in order to increase the redundancy with respect to the jamming of the speed reduction mechanism, the drive shaft is branched into two by interposing an operation gear mechanism similar to the differential gear mechanism 3 after the drive shaft 5, and each of the shafts is illustrated. 1
In the same manner as in the above example, the speed reduction mechanism may be arranged in parallel, and the output may be connected to drive the driven portion.

Next, an example of the configuration of a power transmission device (hereinafter referred to as the present device) secondly provided by the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 8 is a block diagram showing the configuration of the present apparatus. This device has a first power transmission mechanism including a drive source 21 and a reduction mechanism 23 and a second power transmission system including a drive source 22 and a reduction mechanism 24.
Reference numeral 4 is connected by a connecting portion 29 so that the driven portion 28 can be driven equally regardless of which of the driving source 21 and the driving source 22 is selected. The controller 25 selects the first power transmission system and the second power transmission system.

Next, the structure and operation will be described with reference to FIGS. 9, 10 and 11. FIG. In FIG. 9, a driving force input from a driving source (motor) 21 of a first power transmission system is transmitted from a driving shaft 30 to a reduction mechanism 23 that is rotatably supported with respect to a fixed portion 26, and is driven by a driving sun gear 27a. , Planetary gear 27
b, 27d, fixed sun gear 27c, driven sun gear 27
e, which is reduced by the planetary gear mechanism 27 and output to the rotation output unit 31 connected to the driven sun gear 27e.
The driven part (control surface) 28 is driven. The second power transmission system constitutes a linear actuator having a mechanism in which the drive input of the drive source (motor) 22 is decelerated and the drive end 34 performs a linear motion with respect to the fixed portion 33. Is connected to the fixed sun gear portion 32 of the speed reduction mechanism 23 via the connection portion 29. The other end of the drive end 34 of the speed reduction mechanism 24 is oscillated when the drive end 34 makes a linear motion to rotate the fixed sun gear 32 of the speed reduction mechanism 23 via the connecting portion 29. It is supported by a pivot 35 with respect to the fixing part 33 so as to obtain the same. Thus, due to the linear movement of the drive end 34,
The reduction mechanism 23 rotates with respect to the fixed part 26, and the driven part (control surface) 28 is driven.

The selection of the first power transmission system and the second power transmission mechanism is executed by the controller 25 as described above.
For example, normally, the driven portion (control surface) 28 is driven by the first power transmission system, but when jamming occurs in the speed reduction mechanism 23, the controller 25 turns off the drive source 21 and turns off the drive source 22. By turning on, the drive end 34 of the speed reduction mechanism 24 follows the control signal applied to the drive source 22 and
3 by rotating the fixed sun gear portion 32 through the connecting portion 29 so that the reduction mechanism 23 rotatably supported by the fixed portion 26 is fixed to the rotation supporting portion by jamming. It rotates and drives the driven portion (control surface) 28 as a power transmission path while the speed reduction mechanism 23 is jammed as described above. FIG. 10 shows an operation state when the first power transmission mechanism is selected. The drive end 34 of the speed reduction mechanism 24 is fixed, and the rotation of the drive shaft 30 of the speed reduction mechanism 23 is reduced by the speed reduction mechanism 23 to rotate the control surface 28 by b. FIG. 11 shows an operation state when the second power transmission mechanism is selected. The deceleration mechanism 23, which is rotationally supported by the fixed portion 26, is integrated. When the drive end 34 moves downward, the connecting portion 29 rotates by b, and the control surface 28 also moves by b.
It operates to rotate only. Thus, even if the second power transmission system is selected, driving similar to that of the first power transmission system can be obtained. In the above description, a linear actuator whose output end is linearly displaced is used as the drive source 22, but a similar power transmission device can be realized by using a rotational displacement mechanism similar to the speed reduction mechanism 23.

[0016]

The power transmission device provided first by the present invention is constructed as described above, and the rotation of one drive source is branched into two rotation shafts by an operating gear mechanism. Connected to a reduction mechanism with a built-in planetary gear mechanism,
And the fixed sun gear part of one planetary gear mechanism of the two reduction mechanisms is fixed to a fixed end, and the rotation output part of the reduction mechanism is connected to the fixed sun gear part of the other reduction mechanism and connected to the rotation output part. By connecting the driven parts in series, the rotation outputs of the two reduction mechanisms are usually added to drive the driven parts, and when jamming occurs in one of the reduction mechanisms, the rotation input to the remaining reduction mechanisms is performed. Is doubled, and the driven part is driven including the speed reduction mechanism in which the jamming has occurred. Therefore, even if the jamming occurs in any of the systems, the rotational displacement (speed) of the control surface does not greatly change, and It is possible to realize a power transmission device in which the driving force does not fluctuate. Further, the present invention provides a second method.
The power transmission device to provide the two power transmission system,
The driven part is driven by switching by the controller, and the first
A planetary gear mechanism is built in the speed reduction mechanism of the power transmission system, and the driven part can be driven at a reduced speed. The fixed sun gear part and the speed reduction mechanism of the second power transmission system are connected to each other, By connecting the fixed sun gear portion of the first power transmission system so as to be rotatable with the output of the reduction mechanism of the power transmission system, the second power transmission is performed even if jamming occurs in the first power transmission system. It is possible to realize a power transmission device that can drive a driven part in the same manner from the system and that does not cause fluctuations in driving speed and driving force.

[Brief description of the drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of a power transmission device according to the first aspect of the present invention.

FIG. 2 is a conceptual perspective view showing a main configuration of a power transmission device according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a main configuration of a power transmission device according to the first embodiment of the present invention.

FIG. 4 is a diagram showing rotation of each part shown in FIG. 3 according to an operation state of the power transmission device according to the first aspect of the present invention.

FIG. 5 is a diagram showing a driving state of a driven part in a normal operation state of the power transmission device according to the first aspect of the present invention.

FIG. 6 is a diagram showing a driving state of a driven part in a state where the speed reduction mechanism 8 of the power transmission device according to the first aspect of the present invention is fixed.

FIG. 7 is a diagram showing a driven state of a driven part in a state where the speed reduction mechanism 9 of the power transmission device according to the first aspect of the present invention is fixed.

FIG. 8 is a block diagram showing a main configuration of a power transmission device according to a second embodiment of the present invention.

FIG. 9 is a diagram showing a main configuration of a power transmission device according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a driving state of a driven portion in a normal operation state of the power transmission device according to the second aspect of the present invention.

FIG. 11 is a diagram showing a driving state of a driven part in a state where the speed reduction mechanism 23 of the power transmission device according to the second aspect of the present invention is fixed.

[Explanation of symbols]

1. Drive source (motor) 2. Drive transmission mechanism 3. Differential gear mechanism 4a, 4b Transmission gear 5. Drive shaft 6. Drive shaft 7 ... fixed part 8 ... reduction mechanism 9 ... reduction mechanism 10 ... connecting part 11, 12 ... planetary gear mechanism 13a, 13b ...
··· Arm 14 ··· Rotation output unit 15 ··· Rotation output unit 16 ··· Driven part (control surface) 17 ··· Fixed sun gear 18 ··· Fixed sun gear 19 ····axis

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J009 DA16 EA06 EA11 EA16 EA25 EA35 EA44 ED01 ED03 FA30 3J027 FA34 FA37 FB16 GB06 GC13 GC24 GC27 GE29 HB07 HC15

Claims (2)

[Claims] A power transmission device for driving a load by increasing or decreasing the power of rotation or linear motion of a power source and transmitting the power to a load side, wherein two transmission paths for increasing or decreasing the power and transmitting the power. When the transmission force is normal, the driving forces from all the transmission paths are added to drive the load, and when one transmission path is abnormal, the remaining transmission paths are the same as the abnormal transmission paths. A power transmission device, wherein the power transmission device is configured to form a power transmission path in a state. 2. A power transmission apparatus for driving a load by transmitting the power of rotation or linear motion of a power source to a load side by increasing or decreasing the speed, comprising a transmission path for increasing or decreasing the speed and transmitting the power source. Two or more drive systems are arranged side by side, and 1
The load is driven by two drive systems, and when one drive system is abnormal, it is switched to another drive system, and the transmission path in the abnormal drive system is included in the power transmission path as it is. A power transmission device comprising: