TWI394947B - Measurement of Oil Film Distribution in Bearing by Ultrasonic Wave - Google Patents

Description

Method for measuring oil film distribution in bearing by ultrasonic wave

The invention relates to a method for measuring ultrasonic waves, in particular to a method for measuring the distribution of oil film in a bearing by ultrasonic waves.

The general shaft is placed in the bearing and combined with each other, and is filled with an oil film between the two to reduce the friction between the shaft and the bearing, so that the shaft can be in the bearing Smooth rotation, however, when the oil film is insufficient, it is easier to cause a gap between the shaft and the bearing to cause air to remain therein, and under long-term operation, air is mixed into the oil film to generate bubbles, when the bubble is When the oil film is scattered, noise is generated during operation.

Not only that, because the air contains moisture, once the air containing moisture is excessively mixed into the oil film, the oil film will be excessively emulsified, reducing the lubricating effect of the oil film in the bearing. Furthermore, between the bearing and the shaft The oil film contains air bubbles, and the shaft is prone to cavitation when it is rotated, causing the operation to be unsmooth.

Among them, the above cavitation phenomenon is mainly caused by the vortex vacuum phenomenon, causing the bubble to rupture, causing the bearing to directly contact with the shaft, and then the surface is worn and plowed, and the material will withstand the boundary of its elastic fatigue according to its inertial force. As a result, the inner surface of the bearing or the outer surface of the shaft is formed with an uneven wear phenomenon. Even if the inner surface of the bearing and the outer surface of the shaft are coated with a protective layer, the cavitation phenomenon cannot be effectively prevented. The damage caused.

However, since the oil film in the bearing is formed on the inner surface of the bearing, it is difficult to detect where bubbles are generated from the appearance, and it is impossible to adjust the injection amount, injection position and pressure of the hydraulic oil to confirm which air in the oil film should be eliminated. Bubbles cause considerable problems for the current industry. Therefore, how to accurately detect the distribution of oil film in the bearing and reduce the occurrence of cavitation is also the direction of the current efforts.

Accordingly, it is an object of the present invention to provide a method for measuring the distribution of oil film in a bearing by ultrasonic waves with improved measurement performance.

Thus, in the method of measuring the oil film distribution in the bearing by ultrasonic wave, the bearing is rotatably inserted into a shaft, and the measuring method comprises a preparation step, a measuring step, and a returning step.

The preparation step is to embed an ultrasonic probe in the radial direction and exposed on the surface of the shaft and electrically connected to a receiving device, and the shaft is rotatably extended in the bearing, wherein The shaft and the bearing are filled with an oil film.

The measuring step is such that when the shaft is rotated, the ultrasonic probe transmits ultrasonic energy to the inner surface of the bearing, and then the ultrasonic probe receives the ultrasonic reflected energy rebounded from the inner surface of the bearing.

The returning step converts the ultrasonic reflected energy received by the ultrasonic probe into an electrical signal, which is then transmitted to the receiving device and displayed by the receiving device.

The invention has the effect of rotating the ultrasonic probe around the axis of the shaft and simultaneously transmitting ultrasonic energy to the bearing to enable ultrasonic energy The amount is transmitted to the inner surface of the bearing to bounce, and the ultrasonic probe receives the ultrasonic energy and converts it into an electrical signal, which is transmitted back to the receiving device, thereby detecting the oil film distribution between the bearing and the shaft.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

Before the present invention is described in detail, it is noted that in the following description, like elements are denoted by the same reference numerals.

Referring to FIG. 1, a first preferred embodiment of the method for measuring the oil film distribution in a bearing by ultrasonic wave, the measuring method comprises a preparation step 1, a measurement step 2, and a return step 3.

Referring to FIGS. 2 and 3, the preparation step 1 is to embed an ultrasonic probe 42 placed in a radial direction and exposed on the surface of the shaft 41 in a shaft 41, and the shaft 41 is rotatably extended. In the bearing 43, wherein the shaft 41 and the bearing 43 are filled with an oil film, and a wire 45 electrically connected to the ultrasonic probe 42 and a receiving device 44 is embedded in the shaft 41 for making the super The acoustic probe 42 is electrically connected to the receiving device 44 to transmit an electrical signal.

The measuring step 2 is such that when the shaft 41 rotates, the ultrasonic probe 42 transmits ultrasonic energy to the inner surface of the bearing 43, and then receives the ultrasonic rebound from the inner surface of the bearing 43 by the ultrasonic probe 42. Sound waves reflect energy.

The returning step 3 is to convert the ultrasonic reflected energy received by the ultrasonic probe 42 into an electrical signal, and then transmit the electrical energy to the receiving device via the wire 45. It is set to 44 and displayed by the receiving device 44.

As described above, since the ultrasonic probe 42 has the function of sound wave radiation and receiving broadband ultrasonic waves, when the shaft 41 rotates, the ultrasonic probe 42 emits ultrasonic energy to the oil film 40 to be measured (at In this embodiment, the edge of the ultrasonic probe 42 and the inner surface of the bearing 43 are received, and the reflected ultrasonic energy is received, and then the ultrasonic reflected energy is converted into an electrical signal, which is transmitted by the wire 45. To the receiving device 44, the receiving device 44 applies beamforming techniques in combination with all of the electrical signals to produce an image of the area of the oil film 40, thereby observing the distribution of the oil film 40 and whether air bubbles are contained within the oil film 40.

Therefore, the ultrasonic energy is emitted between the bearing 43 and the shaft 41, and the reflected signal image is displayed by the receiving device 44, so as to detect whether there is air bubbles in the oil film 40, and subsequently adjust the injection of the hydraulic oil. The amount, the injection position and the pressure eliminate the air bubbles in the oil film 40, thereby avoiding the occurrence of cavitation and keeping the operation between the bearing 43 and the shaft 41 smooth.

Referring to Figures 1, 4 and 5, a second preferred embodiment of the method for measuring the oil film distribution in a bearing by ultrasonic waves is substantially the same as the first preferred embodiment, and includes a preparation step 1. Measurement step 2, and a back pass step 3.

The difference is that in the preparation step 1, the shaft 41 is provided with a core 46 that does not rotate with the shaft 41. The surface of the core 46 is embedded with three metal rings 47 spaced apart from each other and A wire 45 electrically connected to the plurality of metal rings 47 and the receiving device 44 is embedded in the core 46. An ultrasonic probe 42 disposed in the radial direction and exposed on the surface of the shaft 41 is embedded in the shaft 41. The three ultrasonic probes 42 are electrically connected to the three metal rings 47, respectively. When the shaft 41 rotates, the ultrasonic probe 42 emits ultrasonic energy and receives ultrasonic reflection energy to ascertain the distribution of the oil film 40, thereby increasing the measurement range of the distribution of the oil film 40.

Here, it should be noted that the second preferred embodiment uses the three ultrasonic probes 42 as the measurement of the oil film distribution. However, in actual implementation, the number of the ultrasonic probes 42 may be increased as needed. To expand the scope of detection, it should not be limited to the second preferred embodiment.

In summary, the present invention uses ultrasonic wave to measure the oil film distribution in the bearing, and the ultrasonic probe 42 is rotated about the axis of the shaft 41 to emit ultrasonic energy onto the oil film 40, so that the ultrasonic energy is transmitted to The inner surface of the bearing 43 rebounds, and the ultrasonic probe 42 receives the ultrasonic reflected energy and converts it into an electrical signal, and returns it to the receiving device 44, thereby detecting the distribution of the oil film, and then accurately adjusting the injection amount of the hydraulic oil. The injection position and pressure eliminate the air bubbles in the oil film 40, and the operation of the oil film 40 in the bearing 43 is evenly distributed to avoid the occurrence of cavitation, so that the object of the present invention can be achieved.

However, the above is only the two preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent change of the patent application scope and the description of the invention is Modifications are still within the scope of the invention.

1‧‧‧Preparation steps

2‧‧‧Measurement steps

3‧‧‧Return steps

41‧‧‧ shaft

42‧‧‧Ultrasonic probe

43‧‧‧ bearing

44‧‧‧ Receiving device

45‧‧‧Wire

46‧‧‧ rod

47‧‧‧Metal ring

1 is a block diagram showing a first preferred embodiment of the method for measuring the oil film distribution in a bearing by ultrasonic wave; FIG. 2 is a cross-sectional view showing a portion of the probe of the first preferred embodiment. Figure 3 is a cross-sectional view of a portion of the component, illustrating the probe of the first preferred embodiment in a radial orientation; Figure 4 is a cross-sectional view of a portion of the component illustrating the ultrasonic measurement of the present invention A second preferred embodiment of the method for distributing the oil film in the bearing; and FIG. 5 is a cross-sectional view of a portion of the element, illustrating that the three probes of the second preferred embodiment are placed in a radial direction.

1‧‧‧Preparation steps

2‧‧‧Measurement steps

3‧‧‧Return steps

41‧‧‧ shaft

42‧‧‧Ultrasonic probe

43‧‧‧ bearing

44‧‧‧ Receiving device

45‧‧‧Wire

Claims (1)

A method for measuring the distribution of oil film in a bearing by ultrasonic wave, comprising: a preparation step of inserting a core that does not rotate with the shaft in a shaft, the surface of the core is embedded with a plurality of intervals a metal ring having a wire electrically connected to the metal ring and a receiving device, and a plurality of ultrasonic probes embedded in the radial direction and exposed on the surface of the shaft are embedded in the shaft. The ultrasonic probes are respectively electrically connected to the metal ring, and the shaft is rotatably extended in a bearing; a measuring step, when the shaft rotates, the ultrasonic probe transmits ultrasonic energy To the inner surface of the bearing, the ultrasonic probe receives the ultrasonic reflected energy rebounded from the inner surface of the bearing; and a returning step, converting the ultrasonic reflected energy received by the ultrasonic probe into an electrical signal And then transmitted to the receiving device and displayed by the receiving device to probe the distribution of the oil film in the bearing.