KR900009916Y1 - Checking apparatus of torque - Google Patents

Abstract

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Description

Propeller brake torque measuring device for aircraft

1 is a partial cross-sectional elevation view schematically showing the present invention.

FIG. 2 is a half sectional view of the propeller brake shown in FIG.

3 is an overview of the power transmission system of a propeller aircraft.

* Explanation of symbols for main parts of the drawings

10: substrate 20: central fixing stand

21: locking pin 30: measuring axis

32: mounting holes 33: torsion bar

34: connector 40: torque measuring device

50: movement fixing frame 51: feed lever

52: oil supply pipe 53: guide block

60: propeller brake 61 ': outer cone

62: inner cone 63: spline groove

64: start shaft 66: leaf spring

67: helical shaft 68: bolt ball

69: oil chamber

The present invention relates to a torque measuring device for measuring the braking force limit of the propeller brake of the propeller aircraft, in particular to measure the friction force between the inner cone and the outer cone of the brake in close contact with a constant pressure, the torsion bar torsion The present invention relates to a measuring shaft provided with a measuring device for measuring torque of a brake by converting an angle into an electrical signal, and a measuring clamping device for attaching and detaching the brake to be measured.

Looking at the structure of the engine of the propeller aircraft, as shown in FIG. 2, a reduction gear group 2 is interposed between the engine and the propeller 1, and various accessory devices interlocked therewith, for example, an oil pump, Speedometers, etc. are installed, especially starting motors for engine start.

On the other hand, a propeller brake 60 is installed between the start motor and the reduction gear group 2, and while the aircraft is flying at a constant speed, the rotation speed of the propeller 1 falls below a certain speed, or the propeller is stopped to the ground. When landing, it serves to prevent the propeller from being reversed by its Feeding Angle.

Looking at the propeller brake briefly, as shown in FIG. 2, the outer member 61 is splined to the outer circumferential surface of the start shaft 64 to which the start motor is coupled through the spline groove 63. The outer cone 61 'is in close contact with the inner cone 62, which will be rotated in the same manner, but is slid in the axial direction, and is deflected by the leaf spring 66 and no external force is applied.

And the inner cone 62 is helically coupled with the helical shaft 67 fixed to the reduction gear case, so that the inner cone 62 is slightly rotated to move a slight distance in the axial direction of the shaft axial. Can be.

As described above, the outer cone 61 'of the propeller brake and the inner cone 2 of the propeller brake, which are normally operated, are contacted or separated by various complex factors when the aircraft is in flight. Since the braking force of the propeller brake set by the friction force between the inner circumferential surface of the outer cone 61 'and the inner cone 62 applied by the inner cone 62 is not constant, it is necessary to set it.

In order to measure the braking force, that is, the torque, the torque of the propeller brake has been measured by using a torque wrench equipped with an indicator, which is a tool for tightening a bolt or a nut to a constant torque. Reading error) and measurement error caused by the impact when the outer member and inner cone slide.

And these torque wrenches are inadequate to specify large capacities, such as propeller brakes, because of their low measurement limits. In addition, such an analog measuring device was able to measure the continuous torque value over time, and there is an inconvenience of having to adjust the zero point every time.

Therefore, an object of the present invention is to spline the one side of the horizontal measuring axis in which the electrical torque measuring device is installed by the torsion angle of the torsion bar in order to improve the above problems, it is installed on the central propeller brake fixed to the center of the substrate However, the inner cone is fixed to the stator and the outer member formed integrally with the outer cone to be rotated in combination with the spline of the measuring axis, while the propeller brake on the substrate on one side of the stator to be reciprocated by a fixed distance to the stator To provide a propeller brake torque measurement value for aircraft, characterized in that by installing the.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

In the center of the substrate 10, a central fixing stand 20 in which one end of the spline 31 of the measuring shaft 30, which will be described later, is installed, and the inner side of the propeller brake is disposed on one side of the central fixing stand 20 around the spline 31. A plurality of locking pins 21 fitted in the bolt hole 68 of the helikel shaft 67 to which the cone 62 is coupled are attached.

On the opposite side of the central fixing stand 20, a moving fixing stand 50 is mounted on the substrate 10 to bring the brake 60 provided on the central fixing stand 20 into close contact with one side of the central fixing stand 20. It is coupled to be guided by the guide block 53, the upper portion of the brake oil supply pipe 52 is installed at a certain height, the circumference of the end 64 of the start shaft 64 when the brake 60 is in close contact with A thrust bearing 56 is attached, which is in close contact with ') and facilitates the rotation of the start shaft 64.

On the other hand, at the rear of the movable fixing table 50, that is, at the left side, a feeding lever 51, an intermediate lever 54, a feeding shaft 55, etc., which are mutually coupled to reciprocate the moving fixing table 50 at a predetermined distance, are installed do.

In addition, the measurement axis 30 described above is coupled to the axis several joints 34 and the torsion bar 33 is interposed therebetween, the periphery of the torsion bar 33 by the torsion angle An electric torque measuring device 40 is installed.

The method of measuring the braking force, that is, the torque by the torsion of the torsion bar 33, converts the relative angular displacement due to the torsion distance of the torsion bar 33 to the relative displacement of a predetermined radius position and converts it into an electrical signal. It is more preferable to make the measurement appear in the form.

The electrical signal can be extracted by using a commercially available measuring apparatus such as a magnetic distortion type, a high frequency oscillation type and an inductance change type. Reference numeral 32 is a wrench or a lever fitting.

Hereinafter will be described the operation of the present invention. First, the transfer lever 51 is leaned back to move the moving stand 50 and then installs the propeller brake 60 on the center stand 20.

At this time, the spline 31 of the left end of the measuring shaft 30 is inserted into the spline groove 63 of the brake 60, but the spline 31 is splined to the bolt hole 68 of the helical shaft 67 to which the inner cone 62 is coupled. (31) Make sure that the engaging pins 21 of the circumference are fitted.

Then, the feed lever 51 is rotated to bring the movement fixing table 50 into close contact with the brake 60 so that the brake 60 is not detached. At this time, the brake oil supply pipe 52 of the movable fixing table 50 is fitted to the inner diameter of the start shaft 64 of the brake 60 to enable the supply of oil to the oil chamber 69 inside the brake 60. And a lever (not shown) or a wrench (not shown) is attached to the mounting opening 32 of the right end of the measuring shaft 30, and it rotates.

At this time, when the friction force between the inner cone 62 and the outer member 61 by the leaf spring 66 inside the brake 60 overcomes the rotational force by the wrench, the torsion bar 33 at the end of the measuring shaft 30 It is twisted.

When the friction force is overcome by increasing the force for rotating the wrench, the outer member 61 and the inner cone 62 start to slide. Therefore, the twist angle of the torsion bar 33 is output as an electric signal by the torque measuring device 40.

This output is amplified by an attached measuring device and digitized via an analog-to-digital converter, which appears on the digital display. Therefore, the inspector only needs to read the numerical value shown on the display. If necessary, if a printing device is installed at the display output, the information can be stored in a hard copy. On the other hand it will be described the operation of the oil supply pipe 52 attached to the mobile station 50.

When the oil from the oil supplier (not shown) supplies brake oil of a predetermined pressure or more into the oil chamber 69 through the oil supply pipe 52, the outer member 61 and the inner cone 62 fall. The necessary inspection at this time is to check whether the brake 60 is released under a constant oil pressure, and if a slight rotational force is applied to the measuring shaft 30 while gradually increasing the oil from a low pressure to a high pressure, When the pressure exceeds a predetermined pressure to overcome the pressure of the leaf spring 66, the outer member 61 slides backward on the outer circumference of the start shaft 64 to be separated from the inner cone 62.

At this time, the outer cone 61 'is rotated by the rotational force of the measuring shaft 30. At this time, the allowable pressure is read through the gauge attached to the oil supply (not shown).

As described above, the present invention checks the electric power of the propeller brake, which requires very precise braking force measurement. Therefore, the measurement error due to the reading error and the impact caused by the past torque wrench on the neck is minimized and the reliability of the measurement is minimized. It also improves the performance and measures the limits that cannot be measured with the torque wrench.

In addition, by outputting the electric signal of the continuously generated torque to the printing mechanism, it is very advantageous to grasp the braking characteristics of the propeller brake by documenting the torque value according to the time variation, especially in the short time, many propeller brakes accurately There are features that can be measured.

Claims (1)

One side end of the horizontal measuring shaft 30 on which the electric torque measuring device is installed by the torsion angle of the torsion bar 33 is rotatably installed on the propeller brake central fixing stand 20 installed in the center of the substrate 10. On the other hand, opposite the central fixing stand 20 is installed so as to be able to reciprocate a certain distance to the movable fixing stand 50 to closely contact the brake 60 installed in the central fixing stand 20, the inner cone of the propeller brake 60 62 is fixed to the central fixing table 20, while the outer member 61 formed integrally with the outer cone 61 'is rotated in conjunction with one end of the measuring shaft 30, characterized in that the Propeller brake torque measuring device for aircraft.