KR19990012431U - Bearing Axial Clearance Measuring Device - Google Patents

Abstract

The present invention relates to a device used to measure and correct the axial clearance of a ball or roller type bearing (Bearing) used by fitting to the use axis of various rotary machines.

In the device for measuring bearing axial clearance, a rotating part consisting of a measuring shaft, a bush, a sleeve and a ball, a fixing part consisting of a base plate and a stud bolt, and a nipple, a hose, a pressure gauge, a valve, and an injection pump are sequentially connected. It is composed of a hydraulic unit, but as in the prior art, without coupling the bearing to the actual use shaft, the bushing, the sleeve is coupled to the measuring shaft and then coupled to measure the bearing to facilitate the disassembly and assembly, the bearing is not damaged, time and The manpower can be reduced, while an oil passage is formed in the bush so that the bearing is in close contact with the measuring shaft by inflating the bush and the sleeve by the hydraulic unit. And maintenance by simplifying the structure of the fixing part And because it has a structure that can facilitate the installation of the measuring device, it is easy to install, measure and calibrate, while minimizing the possibility of damage, such as bearings is a practical design with innovative effects that can reduce time, manpower and cost.

Description

Bearing Axial Clearance Measuring Device

The present invention relates to a device used to measure and correct the axial clearance of a ball or roller type bearing (Bearing) used by fitting to the use shaft of various rotary machines, the axial clearance is the outer ring of the bearing , Which means the amount of play between the inner ring and the ball or roller, and is measured as the amount of movement when either the outer ring or the inner ring is fixed and the other is moved in the axial direction. It is necessary to measure the axial clearance at all times and adjust the value so that the value does not exceed the reference value because accurate rotation is difficult due to the occurrence of slip, not only noise is generated, but also causes damage to the bearing. .

In general, two bearings used in the rotating shaft are used in combination. As shown in FIG. 1, each bearing on the upper and lower sides is the outer ring 10 and the inner ring 11 and a ball or roller 14 therebetween. The outer spacer 12 and the inner spacer 13 are provided between the outer ring 10 and the inner ring 11 of the upper and lower bearings, respectively. On the other hand, the bearing housing 20 is fastened to the outside and the bottom of the outer ring 10 of the upper and lower bearings, the cover 21 is fastened to the upper portion is formed in the flange portion of the bearing housing 20 and the cover 21 The rotating body is fixed through the bolt hole which is rotated about the use axis 40.

A description will be given of the installation, measurement and calibration of a conventional axial clearance measurement device for a bearing of the above structure.

First, as shown in the installation work, the upper and lower bearings, the outer spacers 12 and the inner spacers 13 are assembled to the use shaft 40 by heat-expanding the upper and lower bearing inner rings 11, and then the lock nut 22 or It is fixed with an end plate and the cover 21 is assembled. Once the heated upper and lower bearings have cooled, the use shaft 40 can be placed on top of the screw jack 41 and the flange portion of the bearing housing 20 can be mounted on the pedestal 46 and then fixed by the clamp 48. Adjust the position of the T-groove nut 44 and the height of the stud bolts 45 and the screw jacks 47 so that the T-groove nut 44 is positioned. After that, the magnet part 31 of the dial gauge 30 is attached to the upper part of the bearing housing 20 or the cover 21, and then the upper end of the inner bearing 11 or, in the case of inevitable measurement, to the appropriate part of the use shaft 40. The installation is completed by contacting (32).

In the measurement, first, the use shaft 40 is rotated two to three times so that the ball or roller 14 of the bearing is positioned at the correct position, and then the scale of the dial gauge 30 is zeroed. After that, while slowly applying the appropriate force to the screw jack 41 installed in the lower portion while rotating the use shaft 40 to measure the axial clearance of the axial movement of the use shaft 40, in this case instead of the screw jack 41 An approximate axial clearance may be measured using a lever or the like.

If the measured value deviates from the reference value, the upper and lower thicknesses of the outer spacer 12 and the inner spacer 13 need to be subtracted to correct the axial clearance. For example, in the case of the bearing of the arrangement shown in FIG. Increasing the thickness of n) or reducing the thickness of the inner spacer 13 improves the axial clearance. However, in order to adjust the thickness of the outer spacers 12 and the inner spacers 13, the upper bearings must be disassembled. Generally, the upper bearings alone are difficult to disassemble due to obstacles such as the bearing housing 20. The lower bearing will be disassembled together.

Conventional disassembly is performed by applying a physical force upward by hanging a hydraulic puller for disassembling the bearing under the flange portion of the bearing housing 20, wherein the upper bearing inner ring 11 and the lower bearing inner ring 11 are disposed. Is forcibly fitted to the use shaft 40, so that it is decomposed only by applying a predetermined force or more, so that a force is applied to the ball or roller 14 and the inner raceway surface of the bearing during disassembly, thereby increasing the risk of damage to the bearing. An example of an angular contact ball bearing in which the lower bearing outer ring 10, the lower ball 14 and the lower bearing inner ring 11 are not easily separated in the normal state as shown in FIG. Force is applied only to the outer ring 10 so that the lower ball 14 and the lower bearing inner ring 11 are separated, and at this time, the edge portion of the lower bearing outer ring 10 where the fine jaws are formed is damaged. Therefore, it is sometimes impossible to reach far enough to reuse adversely affect the bearing. After the above process, the thickness of the outer spacer 12 and the inner spacer 13 is adjusted, then reassembled, and the axial clearance measurement is repeated. This causes a lot of time and manpower, In addition to the shortening of the service life, the unused bearings are often rendered unusable due to careless handling, thereby increasing production costs.

The present invention was devised to solve such a problem, and the upper and lower bearings and the outer spacers and the inner parts are mounted on bushes and sleeves which are assembled to separate measuring shafts without forcibly fitting the upper and lower bearings directly to the use shaft as in the prior art. The spacer and bearing housing are easily installed for disassembly and assembly, and the axial clearance can be measured by the oil pressure only when measuring the axial clearance, so that the axial clearance can be measured. The aim is to provide a bearing axial clearance measurement device that minimizes the possibility of reducing time, manpower and cost.

1 is a block diagram of a conventional bearing axial clearance measuring device

2 is a block diagram of a bearing axial clearance measuring device of the present invention

Explanation of symbols for main parts of the drawings

10: bearing outer ring 11: bearing inner ring

12: outer spacer 13: inner spacer

14: Ball

20: bearing housing 21: cover

22: Lock Nut

30: Dial Gauge 31: Magnet

32: measuring stage

40: Shaft 41: Screw Jack

42: T groove plate 43: T groove

44: T-groove nut 45: Stud bolt

46: pedestal 47: screw jack

48: clamp

50: Bush 51: oil groove

52: oil hole 53: screw portion

54: Nipple 55: Hose

56 pressure gauge 57 valve

58: Injection Pump

60: sleeve 61: screw portion

62: end plate bolt hole 63: ring

70: measuring axis 71: locking jaw

72: center hall 73: ball

74: nipple hole

80: base plate 81: T groove

82: T-groove nut 83: stud bolt

The present invention is composed of a rotating part, a fixing part and a hydraulic part as shown in Figure 2, the rotating part is composed of a measuring axis 70, the bush 50, the sleeve 60 and the ball 73. The measuring shaft 70 has a locking jaw 71 formed with a nipple hole 74 at a lower portion thereof, and a center hole 72 at a lower portion thereof, and an outer diameter of the bush 50 that is heated to a high temperature is forcibly fitted. It is formed to be, the bush 50 has a plurality of oil grooves 51 are machined in the circumferential direction on the inner side, the oil hole connecting each oil groove 51 is machined in the direction parallel to the shaft The lower end of the oil hole is processed with a screw portion 53, the lower end is formed with a locking jaw, the outer diameter is slightly smaller than the inner diameter of the sleeve 60, the lower end of the sleeve 60 is fixed jaw It is machined to prevent the ring 63 from being pushed to the lower end, and the upper end and the threaded part 61 for fastening the lock nut 22 so as to fix the assembled upper and lower bearings in the axial direction. End cover bolt holes 62 are machined. The bearing can be fixed by selecting one of two methods. The inner diameter is slightly larger than the outer diameter of the bush 50, and the outer diameter is slightly smaller than the upper and lower bearing inner diameters. Balls that can be rotated according to the dimensions of the bearing to be used in various ways, and the measuring axis 70 can be rotated smoothly between the upper end of the screw jack 41 in the center of the base plate 80 and the measuring axis 70 A 73 is installed, and the ball 73 helps to easily rotate about the center hole 72 processed at the center of the lower end of the measuring axis 70 when the measuring axis 70 rotates.

On the other hand, the fixing portion is composed of a base plate 80 and a plurality of stud bolts 83, a plurality of T groove 81 is processed in the base plate 80, the screw jack 41 in the center The T-groove 81 is fitted with a T-groove nut 82 and a stud bolt 83 is assembled thereto, and the stud bolt 83 and the T-groove nut 82 are arranged along the T-groove 81. It is movable and can be fixed by being inserted into the bolt hole of the bearing housing 20 and the cover 21.

In addition, the hydraulic part is configured by the nipple 54, the hose 55, the pressure gauge 56, the valve 57 and the injection pump 58 in order, the nipple 54 is connected to the screw portion 53 Is fastened.

Referring to the operation of the present invention having the above structure, first, with respect to the installation of the measuring device, the upper bearing inner ring 11 and the lower bearing inner ring 11 in the state that the measuring shaft 70 and the bush 50 is forcibly fitted and assembled. Insert the sleeve (60) according to the inner diameter of the), the ring 63 to the sleeve 60, and then the bearing housing (20) in which the upper and lower bearings, the outer spacers 12, and the inner spacers 13 are assembled. It is inserted in a natural state, and the upper bearing inner ring 11 is fixed by the lock nut 22 or the end plate. The bearing housing 20 moves several T-groove nuts 82 in which the stud bolts 83 are assembled to fit the bolt holes of the bearing housing 20 and the cover 21 and then fixes them. After that, the installation is completed by connecting the nipple 54 to the threaded portion 53 and connecting the injection pump 58 through the hose 55, the pressure gauge 56, and the valve 57.

Subsequently, when measuring the axial clearance, the bush 50 and the sleeve 60 are brought into the same interference fit state as when the upper bearing inner ring 11 and the lower bearing inner ring 11 are assembled to the use shaft 40 as in the related art. ) Should be inflated. For reference, comparing the tolerances in which the parts are assembled, the outer diameter of the upper and lower bearing inner ring 11 and the sleeve 60, the inner diameter and the bush of the sleeve 60 before inflating the bushing 50 with the injection pump 58 The outer diameter of 50 has a slight loose tolerance, and can be disassembled and assembled at room temperature without heating. However, when the loose tolerance is referred to as 'a', the difference between the inner diameter of the bushing 50 and the outer diameter of the measuring axis 70 is greater than about 3 times the outer diameter of the 'a'. After heating to a high temperature, it must be assembled to the measuring shaft 70. The bush 50 assembly work only needs to be performed once at the time of axial clearance measurement. As described above, when the injection pump 58 is operated to expand the inner diameter of the bushing 50 while the parts are assembled, the sleeve 60 is expanded in the radial direction until the oil flows up and down the bushing 50. The bearing is assembled into the same interference fit state as when the bearing is assembled to the actual use shaft 40. At this time, the method of confirming that the outer diameter of the sleeve 60 is expanded to the same dimension as the outer diameter of the use shaft 40 checks the pressure gauge 56 attached to the injection pump 58 before using the device of the present invention. While operating the injection pump 58 by measuring the amount of expansion by using an external diameter micrometer (Micrometer), etc. for each pressure, it is possible to inflate as necessary in actual use. Once expanded to the same dimensions as the actual axis to be used, its size is maintained by locking the valve 57.

The magnet part 31 is then attached to a suitable place of the bearing housing 20 or cover 21, and the measuring end 32 of the dial gauge 30 is fitted to the upper bearing inner ring 11 or the measuring axis 70. The ball or roller 14 is correctly positioned on the inner race wheel of the outer spacer 12 and the inner spacer 13 by turning the measuring shaft 70 two to three times from side to side. 0). Thereafter, by slowly tightening the screw jack 41 attached to the center of the base plate 80, while the ball 73 pushes the measuring shaft 70, the measuring shaft 70 is rotated two to three times to the lower side. After 14) is correctly positioned on the inner ring 11 and the outer ring 10 orbit, it is measured by reading the scale of the dial gauge 30.

When the measured value deviates from the reference value, in order to disassemble the bearing for adjusting the thickness of the outer spacer 12 and the inner spacer 13, first, the valve 57 of the injection pump 58 is opened to reduce the inner diameter of the bush 50. The oil pressure that was inflated is removed to allow oil to return to the injection pump 58. When the inner diameter of the bush 50 is retracted to its original dimensions, the bearing housing 20 in which the bearing, the outer spacer 12 and the inner spacer 13 are assembled can be easily removed at room temperature only by disassembling the lock nut 22. After the take-out, the thickness of the outer spacers 12 and the inner spacers 13 is added or subtracted, and after the installation and measurement are repeated in the above-described manner, the work is quickly performed without bearing damage.

As such, the present invention does not forcibly fit the upper and lower bearings directly to the use shaft 40 as in the prior art, and the upper and lower bearings and the outer and outer bearings on the bush 50 and the sleeve 60 assembled to the measuring shaft 70 provided separately. The spacer 12, the inner spacer 13, and the bearing housing 20 are easily installed to be disassembled and assembled, and the axial clearance can be measured by making an interference fit by the pressure of oil only when measuring the axial clearance. It is a practical design with innovative effects that can reduce the time, manpower and cost by minimizing the possibility of breakage of bearings while being easy to measure and calibrate.

Claims (1)

A device for measuring bearing axial clearance, comprising: a rotating portion composed of a measuring shaft 70, a bush 50, a sleeve 60, and a ball 73, a high portion composed of a base plate 80 and a stud bolt 83; Comprising the hydraulic portion is composed of the chief and nipples 54, hoses 55, pressure gauges 56, valves 57 and the injection pump 58 are sequentially connected, the measuring axis 70 is nipple in the lower portion A locking jaw 71 having a hole 74 formed therein is provided with a center hole 72 at a lower end thereof. The bush 50 has a plurality of oil grooves 51 machined in the circumferential direction on an inner side thereof, and each oil The oil hole 52 connecting the groove 51 is processed in a direction parallel to the shaft, and the threaded portion 53 is processed at the bottom of the oil hole, and has a locking jaw at the bottom thereof, and the sleeve 60 is at the bottom thereof. A fixing jaw is formed in the upper part, and a threaded portion 61 and a plurality of end cover bolt holes 62 are machined on the upper end thereof. The outer diameter of the bush 50 is slightly larger than the inner diameter of the bush 50 such that the bush 50 is fit fit, the inner diameter of the sleeve 60 is slightly larger than the outer diameter of the bush 50, the outer diameter is smaller than the upper and lower bearing inner diameter Small, the ball 73 is the measuring axis (in the middle of the center hole 72 and the top of the screw jack 41 installed in the center of the base plate 80 in which a plurality of T-groove 81 is processed) 70 is rotatably installed, and a stud bolt 83 is assembled to the T-slot nut 82 to move along the T-groove 81 to the bolt hole of the bearing housing 20 and the cover 21. Is fixed, the nipple 54 is the bearing axial clearance measuring device, characterized in that fastened to the screw portion 53