JPH0513566B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is used in the technical field of elastic joints, and particularly relates to a device for measuring the dynamic displacement angle of an elastic joint that allows displacement in the circumferential and radial directions. It is something.

(Prior Art and Problems) Since the propulsion shafts of ships and the like are extremely long, intermediate shafts are provided and these are connected by joints. In large ships, torsional vibrations occur due to the large transmission torque of the engine due to the fluctuating torque of the engine.In order to absorb this vibration and prevent damage to the engine or shaft, elastic joints are used as the above joints. It is often done. Such an elastic joint is obtained by connecting joint members attached to two shafts through an elastic member, and between the two joint members,
That is, circumferential and radial displacement is allowed between the two axes. Even if the elastic joint does not produce a large displacement angle when subjected to static torque, it produces a large displacement angle when subjected to the above-mentioned fluctuating torque, that is, dynamic fluctuations in torque. If this dynamic displacement angle is large, it will not only affect the characteristics of the elastic joint but also pose a safety problem, so measures such as reducing the speed must be taken, and it is important to know the above displacement angle. has become important.

Conventionally, as a method of determining the above displacement angle, two reflective plates were uniformly pasted on the circumferential surface of the shaft at regular intervals.
This was determined by detecting reflected pulses of light during rotation and calculating the amount of phase difference between the two reflecting plates. However, in this method, the detection is not direct, and the device becomes extremely complex and large, making it unsuitable for measurement in a narrow space around the axis of a ship.
Further, although it is possible to perform temporary measurements, it is also inconvenient for continuous measurements.

(Means and effects for solving the problems) The present invention solves the problems of the above-mentioned conventional devices, detects the displacement angle directly in the elastic joint, and detects the displacement angle in the radial direction. It is an object of the present invention to provide a dynamic displacement angle measuring device for an elastic joint, which has a simple structure and is not affected by the effects of elastic joints.

In order to achieve the above object, the present invention measures the dynamic displacement angle of a joint in which two joint members are connected via an elastic body and allow circumferential and radial displacement between the two joint members. In the device, the base of the first leaf spring is fixed to one joint member, and the base of the first leaf spring is provided on the other joint member and continuously extends in the radial direction in the circumferential direction with respect to the reference peripheral surface of the other joint member. The distal end of the first leaf spring is slidably contacted in the circumferential direction on a displacement base formed to vary the angle of the displacement base, and the base of the second leaf spring is fixed to one of the joint members. , a tip end of the second leaf spring is brought into contact with the reference peripheral surface of the other joint member so as to be able to freely slide in the circumferential direction, and each of the first leaf spring and the second leaf spring,
A detection element for detecting displacement in the radial direction is attached, and a calculator is provided for calculating the displacement angle from the difference between the displacements detected by the two detection elements, using the displacement angle per unit height displacement based on the displacement as a known quantity as a reference. It consists of the following:

According to the device of the present invention having such a configuration, the dynamic displacement angle of the elastic joint is measured in the following manner.

When torque acts on the elastic joint and causes a circumferential displacement angle and a radial displacement between the joint members located on both sides of the elastic body, the tip of the first leaf spring changes based on its elasticity. By slidingly moving the displacement base in the circumferential direction on the displacement base, the displacement including both the height (in the radial direction) of the displacement base and the displacement in the radial direction corresponding to the displacement angle is achieved. (deformation), and this amount of displacement is detected by the detection element of the first leaf spring.

On the other hand, since the tip of the second leaf spring is in sliding contact with the reference circumferential surface of the mating joint member, the second leaf spring is only displaced (deformed) by the amount of the radial shift. The detection element of the second leaf spring then detects this displacement.

Since the computing unit calculates the difference between the displacements detected by the two detection elements, only the radial displacement on the displacement base corresponding to the displacement angle can be obtained. The height of the above displacement base corresponds to the angular position in the circumferential direction, and the relationship between them has already been determined as a known quantity, so using this as a reference, the displacement obtained as the above difference quantity is compared to determine the actual displacement. You can get the horn.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a longitudinal sectional view of an elastic joint device in which the device of this embodiment is adopted.

In this elastic joint, one joint member is formed as an inner ring 10 and the other joint member is formed as an outer ring 11, and an elastic body 12 is strongly bonded between the two rings 10 and 11.

Both the inner ring 10 and the outer ring 11 are provided in pairs on the left and right, and are integrated with bolts 13 and 14 via intermediate plates 15 and 16, respectively.

A collar body 17 is attached to the inner ring 10 to be connected to one shaft (not shown), and a collar body 18 is attached to the outer ring 11 to be connected to the other shaft (not shown). Thus, torque is transmitted to the two shafts connected to the flanges 17 and 18 via the elastic body 12, but at this time, torque fluctuations and radial displacements are absorbed by the elastic body 12. Become.

A displacement angle measuring device 1 as shown in FIGS. 1A and 1B is attached to the elastic joint as described above. FIG. 1A is an enlarged partial front view of the measuring device, and FIG. 1B is a plan view thereof.

1A and B, a displacement base 2 whose height increases continuously in the circumferential direction as shown in FIG. 3 is formed on a part of the circumferential surface of the collar body 17 attached to the inner ring 10. I am forced to do so.

On the other hand, an arm 3 is attached to the outer ring 11, and the lower end of the arm reaches close to the circumferential surface of the collar body 17. A mounting block 4 is fixed to the lower end of the arm. A first leaf spring 5 and a second leaf spring 6 extend from the upper and lower surfaces of the block 4, respectively.

The tip of the first leaf spring 5 is connected to the displacement base 2.
It is in contact with the upper surface of the holder and can be slid in the circumferential direction.
On the other hand, a rod member 7 is attached to the tip of the second leaf spring 6 facing downward, and the tip of the rod member 7 is attached to the cylindrical circumferential surface 17A of the collar body 17 as a reference circumferential surface. is being oppressively approached.

Strain gauges 8A and 8B as detection elements are attached to both leaf springs 5 and 6, respectively, to measure displacement (deformation) using the four-gauge method, and their outputs are transmitted through a telemeter on the outer ring. It is designed to be sent to an arithmetic unit.

In the apparatus of this embodiment as described above, the displacement angle is measured in the following manner.

First, the leaf spring 5 is moved in the circumferential direction by the displacement base 2, and the strain caused by the deformation of the spring 5 is measured by the strain gauge 8.
Record and calibrate using A. At this time, the angle scale of the joint is attached to the displacement base 2, and the relationship between the angle scale and the height displacement (deformation) of the displacement base 2 is determined.

When the shaft begins to rotate after the above preparations are completed, the joint produces a displacement angle in response to the instantaneous torque. In some cases, displacement also occurs in the radial direction. That is, the inner ring 10 and the outer ring 11
produces a displacement angle in the circumferential direction and also a displacement in the radial direction.

In this state, the first leaf spring 5 moves on the displacement base 2 and the amount of displacement changes. At this time, the radial displacement of the first leaf spring 5 is determined based on the displacement angle in the circumferential direction, and that between the inner ring 10 and the outer ring 1.
This includes displacement in the radial direction based on the misalignment of the axis with respect to 1. The strain gauge 8A detects displacement including both of these.

On the other hand, since the second leaf spring 6 slides on the peripheral surface 17A of the flange body 17, which is the reference peripheral surface, via the rod member 7, the strain gauge 8B of the second leaf spring 6
detects only the displacement in the radial direction based on the misalignment of the axes of the inner ring 10 and the outer ring 11.

The displacement amounts detected by the strain gauges 8A and 8B are each sent by a telemeter 9 to a computing unit (not shown) provided in a measurement room or the like.
The difference between the two displacement positions is calculated as a displacement angle based on the relationship between the angle scale and displacement described above. In this way, even in the case of an elastic joint, the displacement angle can be determined at all times without being affected by any deviation in the radial direction.

Note that the elastic joint applied to the present invention is not limited to the one shown in FIG. 3, and any type of elastic joint can be used.

(Effects of the Invention) Since the present invention is constructed as described above, it can be implemented with an extremely simple structure, and is fully compatible with elastic joints of propulsion shafts of ships arranged in narrow ship bottoms, and the displacement angle can be directly adjusted. Since it is a detection method, it is possible to accurately and constantly monitor changes in displacement angle, which has the effect of ensuring safety during navigation. Moreover, there is no effect of misalignment between the two axes that the elastic joint has.

[Brief explanation of the drawing]

FIG. 1 shows a device according to an embodiment of the present invention, A is a front view, B is a plan view, FIG. 2 is a side view of the displacement base portion in FIG. 1, and FIG. FIG. 1... Displacement angle measuring device, 2... Displacement base, 5
...First leaf spring, 6...Second leaf spring, 8A,
8B... Sensing element (strain gauge), 10, 11...
Joint member (10...inner ring, 11...outer ring), 12
...Elastic body, 17A...Reference peripheral surface.

Claims (1)

[Claims] 1. In an apparatus for measuring a dynamic displacement angle of a joint in which two joint members are connected via an elastic body and allow circumferential and radial displacement between the two joint members, The base of the first leaf spring is fixed to the joint member, and the base of the first leaf spring is provided on the other joint member so that the height in the radial direction changes continuously in the circumferential direction with respect to the reference peripheral surface of the other joint member. The distal end of the first leaf spring is brought into sliding contact with the formed displacement base in the circumferential direction, and the base of the second leaf spring is fixed to one of the joint members, and the other joint is fixed to the base of the second leaf spring. A tip end of the second leaf spring is brought into sliding contact with the reference peripheral surface of the member in the circumferential direction, and each of the first leaf spring and the second leaf spring,
A detection element for detecting displacement in the radial direction is attached, and a computing unit is provided for calculating the displacement angle from the difference between the displacements detected by the two detection elements, using the displacement angle per unit height displacement of the displacement base as a known quantity as a reference. A dynamic displacement angle measuring device for an elastic joint, which is characterized by: