JPH0315139B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small and lightweight thrust load measuring device for accurately measuring the thrust load acting on a bearing.

[Prior Art] For example, when an excessive thrust load is applied to a bearing portion of a rotating machine such as an aircraft engine, a gas turbine, or an axial flow compressor, not only the bearing is damaged but also the entire machine is affected. However,
Accidents can be prevented and safety can be improved by measuring this thrust load and taking measures according to the value to bring the bearing to its original normal load state.

Therefore, various devices for measuring thrust loads have been studied.

[Problems to be solved by the invention] However, since the area around the bearing is generally located in a narrow area and the atmosphere is immersed in high temperature oil, it is considered difficult to install a thrust load measuring device in this area. Moreover, a mechanism for detecting thrust load and a device equipped with the mechanism may be large in size, making it difficult to put them into practical use. Conventionally, operations were performed without a thrust load measuring device, disassembled after operation, and inspections of the degree of damage to bearings, etc. were determined based on guesswork and experience. It was a sloppy operation, which was the biggest safety defect.

In view of the above-mentioned circumstances, the present invention has been made with the object of making it possible to quickly and accurately measure the thrust load acting on a bearing by installing a small and lightweight thrust load measuring device around the bearing. be.

[Means for Solving the Problems] The present invention provides an annular load detection member mounted between a flange on the outer periphery of a bearing outer race fitted to a rotatable shaft and a bearing support member. At least one of the outer periphery and the inner periphery of the load detecting member is provided with concave sensing portions having strain gauges attached to the inner surface at approximately equal intervals in the circumferential direction, and between each sensing portion of the load detection member, It has a structure in which grooves extending in the direction are bored in a staggered manner when viewed from the circumferential side.

[Operation] The thrust load is transmitted from the shaft through the bearing and the flange of the bearing outer race to the load detection member, and by displacing the load detection member, it is detected by the strain gauge and taken out to the outside.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 4 show an embodiment of the present invention, in which an inner race 3 of a bearing 2 is fitted onto a rotatable shaft 1 so as to be able to rotate integrally with the shaft 1, and the outer periphery of the inner race 3 An outer race 5 is fitted through balls 4, and a flange 6 is fixed to the outer periphery of the outer race 5. Also inner lace 3
is tightened by a tightening nut 7 and fixed to the shaft 1.

A load detection member 8 having flanges 8a and 8b fixed to the front and rear in the axial direction is disposed between the flange 6 fixed to the outer periphery of the outer race 5 of the bearing 2 and the bearing support member 10, and is arranged between the flange 6 of the outer race 5 and the load detection member 8. It is fastened to the flange 8a of the detection member 8 by bolts 9 disposed at required intervals in the circumferential direction.
Flange 8b of load detection member 8 and bearing support member 1
It is fastened to the flange 10a of No. 0 by bolts 11 disposed at required intervals in the circumferential direction.

Concave sensing portions 12a, 12b are provided on the outer and inner peripheries of the load detection member 8 at approximately equal intervals in the circumferential direction. Strain gauges 13a and 13b are attached, and a heat-resistant and oil-resistant resin is filled.

Between adjacent sensing parts 12a, 12a and 12
Grooves 14a and 14b extending in the circumferential direction and having circumferential ends reaching the front or rear surfaces of the sensing portions 12a and 12b and passing through the load detection member 8 in the radial direction are provided between the load detection members 8 and 12b. When viewed from the outer circumferential side of 8, they are bored in a staggered manner. Thus, the grooves 14a, 14b are provided on both the left and right sides when the sensing sections 12a, 12b are viewed from the negative direction in FIG. In addition, 15a,
15b is a groove for the lead wires of the strain gauges 13a, 13b.

The thrust load generated on the shaft 1 is transmitted as a distributed load to the bearing 2, which acts on the load detection member 8 via the flange 6 and flange 8a, and is transmitted from the flange 8b to the bearing support member 10, where it is supported.

In the above-mentioned thrust load transmission process, the flanges 8a and 8b move into the groove 14 due to the thrust load.
Although the grooves 14a and 14b are easily deformed and difficult to transmit the load to the load detection member 8, the grooves 14a and 14b
Since the portion without 14b is difficult to deform, the sensing portions 12a and 12b are connected from this portion as shown in FIG.
A load F is transmitted to the strain gauge 1 due to the load.
3a and 13b are displaced, and this displacement is converted into an electrical signal proportional to the magnitude of the thrust load, and is extracted as an amount of information equivalent to an external force by a lead wire. From this extracted electric signal, the load detection member 8
The distributed load acting on the thrust load is detected and displayed and recorded as a thrust load. The thrust load acting on the shaft 1 is detected as positive in one direction, and as a negative output in the opposite direction.

As the shaft 1 rotates, a drag torque is generated at the flange 6 of the bearing 2, but the tangential force due to the drag torque is supported by the bolt 9.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] According to the bearing thrust load measuring device of the present invention, the thrust load can be measured by immersion in high-temperature oil, vibration,
Even repeated forces such as sudden loads and sudden releases are quickly and reliably transmitted to the load detection member, enabling highly accurate load detection.〈〉The load detection member is attached to the bearing support member. Since no special parts are required for attaching the load detection member, the entire device is small and lightweight.〈〉Since the load detection member is integrated, it is easy to assemble, and there is no need for abnormal loads to be applied to the bearing. 〈〉 It prevents damage to the bearing, reduces the burden on other mechanical parts, and improves the stability around the bearing. 〈〉 The load detection member with the strain gauge attached can be used repeatedly and is interchangeable, so it is easy to manufacture. 〈〉 Entire device Since it can be handled as a single unit, it can produce various excellent effects such as easy inspection of malfunctioning parts and easy replacement of load detection members.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment of the bearing thrust load measuring device of the present invention, FIG. 2 is a view taken in the direction of the arrow in FIG. 1, FIG.
This figure is a view taken in the -direction arrow of FIG. 2, and FIG. 5 is an explanatory diagram of the load transmission state in the bearing thrust load measuring device of the present invention. In the figure, 1 is a shaft, 2 is a bearing, 6 is a flange, 8 is a load detection member, 10 is a bearing support member, 12a, 12
b is a sensing part, 13a and 13b are strain gauges, 14
a and 14b indicate grooves.

Claims (1)

[Claims] 1. An annular load detection member is installed between a flange on the outer periphery of a bearing outer race fitted to a rotatable shaft and a bearing support member, and at least one of the outer periphery and inner periphery of the load detection member has a circumferential surface. Concave sensing portions with strain gauges attached to the inner surface are provided at approximately equal intervals with respect to the direction, and grooves extending in the circumferential direction are formed between each sensing portion of the load detection member in a staggered shape when viewed from the circumferential side. A thrust load measuring device for a bearing, characterized by having a hole in the bearing.