JP3435313B2 - Vibration probe - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration probe for transmitting vibration of a rotary shaft of a rotary machine to a vibrometer.

[0002]

2. Description of the Related Art As a vibration probe for transmitting vibration of a rotating shaft to a vibrometer, for example, as shown in FIG.
A contactor 107 that comes into contact with the peripheral surface of the rotating shaft 105 is provided at the tip of the movable shaft 103 supported by 01.

The movable shaft 103 is constantly urged downward by an urging spring 109 and can be slid vertically by a sliding bearing 111, and the vibration from the contact 107 is transmitted to the vibrometer 113. Has become.

[0004]

The contact element 107 is urged by an urging spring 109 so as to be constantly in contact with the peripheral surface of the rotating shaft 105. However, when the lubricating oil acts on the sliding bearing 111 during rotation. It will be pushed back in the direction of the arrow. When the contact 107 is pushed back in the direction of the arrow, the contact floats above the rotary shaft 105 and accurate measurement cannot be performed.

In this case, a means may be considered in which the sliding bearing 111 has an outer diameter smaller than the inner diameter of the support cylinder 101, and a gap is provided to allow the action of the lubricating oil to escape from the gap. If the gap is large, a more reliable effect can be expected, but on the other hand, the gap becomes a play allowance of the sliding bearing 111, which results in picking up lateral vibrations, which causes a new problem that accurate measurement becomes difficult.

Therefore, an object of the present invention is to provide a vibration probe which minimizes the influence of lubricating oil and enables accurate measurement with a contact.

[0007]

In order to achieve the above object, the present invention relates to a movable shaft provided with a contactor in a support cylinder, the contactor being in contact with the peripheral surface of a rotating shaft to be measured. A cylindrical sliding bearing that is inserted into the shaft and is slidable along the circular wall surface of the support cylinder, and an urging spring that applies an urging force toward the rotating shaft side to the contactor are provided and received by the contactor. Vibration
In the vibration probe that transmits to the vibrometer via the movable shaft, the lubricating oil on the peripheral surface of the rotating shaft acts on the sliding bearing,
A lubricating oil escape passage is provided to prevent the contactor from being pushed back against the biasing spring.

The lubricating oil escape passage of the preferred embodiment is composed of a through hole provided in the sliding bearing and penetrating in the axial direction, and a discharge hole provided in the support cylinder for allowing the lubricating oil from the through hole to escape to the outside. .

Alternatively, it is constituted by an axial groove provided on the outer peripheral surface of the sliding bearing and a discharge hole provided in a support cylinder for letting the lubricating oil from the groove escape to the outside.

Alternatively, in the fitting area where the sliding bearing is fitted, an axial groove provided on the peripheral surface of the movable shaft and a discharge hole provided on the support cylinder for letting the lubricating oil from the groove escape to the outside. It consists of.

Alternatively, in the sliding area where the sliding bearing slides, an axial groove formed in the inner wall surface of the support cylinder and a discharge hole formed in the support cylinder for letting the lubricating oil from the groove escape to the outside are formed. Constitute.

In this case, it is desirable that a plurality of through holes and concave grooves are arranged substantially evenly with respect to the axis of the movable shaft.

According to such a vibration probe, the vibration from the contactor is transmitted to the vibrometer via the movable shaft.

During this measurement, if the lubricating oil on the peripheral surface of the rotating shaft acts on the sliding bearing, the lubricating oil escape passage allows the lubricating oil to pass through the sliding bearing and then escape to the outside of the support cylinder. Further, the pressure of the lubricating oil that exceeds the spring pressure of the biasing spring does not work, and the lateral vibration is not picked up. Therefore, the contactor surely contacts the peripheral surface of the rotating shaft, and accurate measurement can be obtained.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings of FIGS.

In FIG. 1, reference numeral 1 denotes a support cylinder of the vibration probe V, and a movable shaft 5 supported by a bearing 3 penetrates through the support cylinder.

A contactor 9 for contacting the peripheral surface of the rotary shaft 7 is provided at the tip of the movable shaft 5, and the contactor 9 is constantly urged toward the rotary shaft 7 by an urging spring 11. .

The urging spring 11 is a coil spring and is interposed on the movable shaft 5. One end is the bearing 3 and the other end is the movable shaft 5.
Are in contact with the respective flange-shaped spring bearings 13 provided on the.

The movable shaft 5 has a function of transmitting the vibration from the contactor 9 to the vibrometer 15, and a cylindrical sliding bearing 17 is integrated between the contactor 9 and the spring receiving portion 13. It is inserted and fixed to.

The sliding bearing 17 is slidable along the inner wall surface of the support cylinder 1 and has a plurality of axial through holes 21 which serve as lubricating oil escape passages 19.

The lubricating oil escape passage 19 has a sliding bearing 17
And a discharge hole 23 provided in the support cylinder 1. A pair of discharge holes 23 are provided on the left and right.

Two through-holes 21 are provided at 180-degree symmetrical positions with respect to the axis X of the movable shaft 5. in this case,
As shown in FIG. 3, three 120-degree intervals may be provided, or four 90-degree intervals may be provided as shown in FIG.

FIGS. 5 to 15 show another embodiment of the lubricating oil escape passage 19. In the lubricating oil escape passage 19 shown in FIG. 5, an axial groove 25 provided on the outer peripheral surface of the sliding bearing 17 and a discharge hole provided in the support cylinder 1 for allowing the lubricating oil from the groove 25 to escape to the outside. And 23.

In this case, the concave groove 25 has a center X of the movable shaft 5.
Two are provided 180 degrees symmetrical with respect to
It is also possible to provide three 120-degree intervals as shown in FIG. 7 or four 90-degree intervals as shown in FIG.

In the lubricating oil relief passage 19 shown in FIG. 9, the movable shaft 5 is located in the fitting area where the sliding bearing 17 is fitted.
And a drain hole 23 provided in the support cylinder 1 for allowing the lubricating oil from the groove 27 to escape to the outside.

In this case, the concave groove 27 has the axis X of the movable shaft 5.
Two are provided 180 degrees symmetrical with respect to
As shown in FIG. 11, three 120-degree intervals, or FIG.
It is also possible to provide four at 90 degree intervals as shown in FIG.

In the lubricating oil escape passage 19 shown in FIG. 13, in the fitting area where the sliding bearing 17 is fitted, the axial groove 29 provided on the peripheral wall surface of the support cylinder and the groove 29 And a discharge hole 23 provided in the support cylinder 1 for letting the lubricating oil escape to the outside.

In this case, the concave groove 29 has a center X of the movable shaft 5.
Two are provided 180 degrees symmetrical with respect to
As shown in FIG. 14, three at 120 degree intervals, or FIG.
It is also possible to provide four at 90 degree intervals as shown in FIG.

According to the vibration probe V thus constructed, the vibration from the contactor 9 which comes into contact with the peripheral surface of the rotary shaft 7 is transmitted to the vibrometer 15 via the movable shaft 5.

During this measurement, when the lubricating oil on the peripheral surface of the rotary shaft 7 acts on the sliding bearing 17, it passes through the sliding bearing 17 through the through hole 21 and then escapes from the discharge hole 23 to the outside. . Therefore, in the lower portion of the sliding bearing 17, the spring pressure of the biasing spring 11 does not exceed the pressure of the lubricating oil, and the lateral vibration is not picked up.
The contactor 9 surely makes contact with the peripheral surface of the rotating shaft 7, and accurate measurement can be obtained.

[0031]

As described above, according to the vibration probe of the present invention, even if the lubricating oil of the rotating shaft acts on the sliding bearing, the sliding probe is not pushed back, and the contact of the rotating shaft to the rotating shaft is ensured. Contact is possible and accurate measurement results are obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a vibration probe according to the present invention.

FIG. 2 is a perspective view in which a sliding bearing is provided with a through hole.

FIG. 3 is an explanatory diagram in which three sliding holes are provided in a sliding bearing.

FIG. 4 is an explanatory diagram in which four through holes are provided in a sliding bearing.

5 is an explanatory view similar to FIG. 1, showing another embodiment in which a sliding bearing is provided with a concave groove.

FIG. 6 is a perspective view of a sliding bearing provided with a groove.

FIG. 7 is an explanatory diagram in which three concave grooves are provided in the sliding bearing.

FIG. 8 is an explanatory diagram in which four concave grooves of the sliding bearing are provided.

FIG. 9 is a view showing another embodiment in which a movable shaft is provided with a concave groove.
Explanatory drawing similar to FIG.

FIG. 10 is a perspective view of a movable shaft provided with a groove.

FIG. 11 is an explanatory view in which three concave grooves are provided on the movable shaft.

FIG. 12 is an explanatory view in which four concave grooves are provided on the movable shaft.

FIG. 13 is an explanatory view similar to FIG. 1, showing another embodiment in which a concave groove is provided on the inner wall surface of the support cylinder.

FIG. 14 is an explanatory diagram in which three concave grooves are provided on the inner wall surface of the support cylinder.

FIG. 15 is an explanatory diagram in which four concave grooves are provided on the inner wall surface of the support cylinder.

FIG. 16 is an explanatory view of a vibration probe showing a conventional example.

[Explanation of symbols]

1 Support tube 5 movable axes 7 rotation axis 9 contacts 11 Biasing spring 17 Sliding bearing 19 Lubricating oil escape passage

Claims (6)

(57) [Claims] 1. A movable shaft having a contactor in contact with a peripheral surface of a rotary shaft, which is an object to be measured, in a support cylinder, and slides along a circular wall surface of the support cylinder inserted into the movable shaft. A vibrating probe that is provided with a possible cylindrical sliding bearing and an urging spring that imparts an urging force to the contactor toward the rotary shaft side, and transmits the vibration received by the contactor to the vibrometer via the movable shaft. 2. The vibration probe according to claim 1, further comprising a lubricating oil escape passage that prevents the contact surface of the contactor from being pushed back by the lubricating oil on the peripheral surface of the rotating shaft acting on the sliding bearing. 2. The lubricating oil escape passage comprises an axially penetrating hole provided in the sliding bearing, and an exhaust hole provided in a support cylinder for allowing the lubricating oil from the through hole to escape to the outside. The vibration probe according to claim 1. 3. The lubricating oil escape passage comprises an axial groove provided on the outer peripheral surface of the sliding bearing and a discharge hole provided on a support cylinder for allowing the lubricating oil from the groove to escape to the outside. The vibration probe according to claim 1. 4. The lubricating oil escape passage is a fitting insertion region in which a sliding bearing is fitted, and an axial groove provided on the peripheral surface of the movable shaft and a support cylinder for letting the lubricating oil from the groove escape to the outside. The vibration probe according to claim 1, further comprising a discharge hole provided in the vibration probe. 5. The lubricating oil escape passage is a sliding region in which the sliding bearing slides, and includes an axial groove provided on the inner wall surface of the supporting cylinder and a supporting cylinder for escaping lubricating oil from the concave groove to the outside. The vibration probe according to claim 1, comprising a discharge hole provided. 6. The vibration probe according to claim 2, wherein a plurality of through holes and concave grooves are arranged substantially evenly with respect to the axis of the movable shaft.