JP2001255212A - Temperature detector for shaft supporting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature detector for a shaft supporting mechanism capable of accurately detecting the temperature of an outer ring of a rolling bearing in a reliable manner even if the bearing is axially moved by thermal expansion or contraction of a shaft body. SOLUTION: This temperature detector for the shaft supporting mechanism is used to detect the temperature of the mechanism having the bearing for rotatably supporting the shaft body on the fixed side, and is equipped with a temperature detection part 60 for detecting the temperature of the object of temperature detection by causing its end part to abut on the object, a temperature detector body 61 mounted on the fixed side and slidably supporting the detection part 60, slide surface sealing parts 62, 63 for sealing up a gap between the detection part 60 and the detector body 61, and an elastic means 67 for energizing the detection part 60 with a substantially constant force at all times in a direction projecting from the detector body 61. When the bearing is axially moved, the detection part 60 moves forward or backward to follow the bearing while the gap left by the detector body 61 is sealed up, thus maintaining the contact state of the end 60a of the detection part 60 with the bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft (roll) used in a high temperature state, for example, where the inside of a papermaking roll, a resin roll, a rubber roll and the like is heated by a heat medium or the like, and a shaft support of a rolling bearing system. The present invention relates to a temperature detection device of a shaft support mechanism suitable for a mechanism.

[0002]

2. Description of the Related Art Conventionally, in a shaft supporting mechanism of a shaft (roll) -rolling bearing system which is heated and used in a high temperature state body,
During use, the shaft, rolling bearing, and housing are each brought to a high temperature, so bearing bearings such as abnormal overheating and seizure of rolling bearings and bearing lubricants, as well as premature peeling due to thermal expansion and contraction can be prevented. Temperature detection is performed for the purpose of prevention. By detecting the temperature of the shaft support structure, it is possible to take measures such as issuing an alarm or stopping the device when an abnormal overheat condition occurs. Also, the design specifications of the rolling bearings (heat treatment specifications, internal clearance of the bearing, etc.) It is possible to obtain information for determining a bearing lubricant (oil type, oil supply amount, etc.).

When detecting the temperature of a rolling bearing, a bearing lubricant, a housing, etc., which are part of the shaft support structure, a detecting portion of a temperature detector (a portion provided with a thermocouple or the like).
Is attached to the housing so as to make contact with the end surface of the outer ring (fixed ring) of the rolling bearing at substantially right angles. In some cases, the protection tube holding the detection unit is fixed to the housing with a mounting member called a compression fitting.

FIG. 10 is a view showing a conventional compression fitting type sheath-type temperature detector. As shown in FIG. 10, a sheath-type temperature detector of a compression fitting type includes a thermocouple sheath 1 which is a heat-sensitive body, a main body 2 of the temperature detector, and a comparative material such as PTFE (polytetrafluoroethylene) material or brass. A bush 3 made of a soft and elastic material (hereinafter referred to as a soloban ball),
And a tightening ring 4.

[0005] In order to attach the sheath type temperature detector to the bearing housing, the following is performed. First, body 2
The loose ball 3 and the tightening ring 4 are loosely attached to the housing, and the screw portion of the main body 2 is screwed into a female screw hole provided in a bearing housing (not shown) to be fixed. Then, the thermocouple sheath 1 is inserted into a hole formed through the center of the tightening ring 4, the solo bang ball 3, and the main body 2, and the temperature detector 1a at the tip of the thermocouple sheath 1 is inserted.
Is brought into contact with a portion for measuring the temperature of the outer ring (fixed ring) of the rolling bearing and the like, and then the tightening ring 4 is strongly tightened into the main body. As a result, the solo bang 3 is deformed, and the inner diameter of the solo bang 3 is pressed against the outer diameter of the thermocouple sheath 1, and the outer diameter of the solo bang 3 is pressed against the inner diameter of the main body 1.
Is fixed and the fitting portion is sealed.

[0006]

However, such a conventional temperature detecting device for a shaft support mechanism has the following problems. (1) With a large thermal expansion / contraction of the shaft (roll), the outer ring of the rolling bearing attached to the shaft largely moves in the axial direction with respect to the housing. For this reason, when the temperature detecting section is completely fixed to the housing by a sheath-type thermocouple supporting device called compression fitting, the temperature detecting section naturally moves due to thermal expansion and contraction of the outer ring end face of the rolling bearing. Can not follow. Therefore, when the shaft is contracted, a gap is formed between the temperature detecting portion and the outer ring end face, and accurate temperature detection cannot be performed.
In addition, when the shaft is extended, the temperature detecting section is strongly pressed against the end face of the outer ring, and there is a high possibility that the thermocouple sheath is damaged such as bending or buckling.

(2) The tightening force of the compression fitting is loosened so that the fitting part between the temperature detecting part and the compression fitting can slide so that the temperature detecting part can follow the outer ring end face of the rolling bearing as the temperature measuring point. In this case, a gap may be formed between the temperature detection unit and the compression fitting, and the lubricant for the rolling bearing in the housing may leak.

(3) Since the temperature of the lubricant for the rolling bearing is detected by a temperature detector separate from the temperature detector for detecting the temperature of the outer ring of the rolling bearing, the number of the temperature detectors is large. It is expensive.

(4) Since it is relatively difficult to constantly detect the temperature of the inner ring of the rolling bearing, a temperature detector is attached to only the outer ring of the rolling bearing to detect the temperature, and the temperature of the inner ring is obtained from the obtained temperature of the outer ring. In many cases, the temperature of the rolling bearing is estimated to determine whether or not the temperature is within a usable condition range of the rolling bearing. In this case, since the temperature of the inner ring is not an actually measured value, detection accuracy may decrease, and accurate determination may not be performed. In addition, although there is no example of detecting the temperature of the inner ring of the rolling bearing, since the temperature of the outer ring of the rolling bearing is generally lower than the temperature of the inner ring, when detecting the temperature of the inner ring of the rolling bearing, Often detects only the temperature of the inner ring without detecting the temperature of the outer ring of the rolling bearing.

In the case where only the temperature of the outer ring of the rolling bearing is detected, the temperature of the outer ring of the rolling bearing often rises only relatively moderately even if the temperature of the inner ring and the lubricant of the rolling bearing rapidly rises. Therefore, it is not possible to detect a rapid rise in temperature of the inner ring of the rolling bearing or the lubricant. For this reason, even if it deviates from the usable condition range of the rolling bearing, it is often not understood. In addition, determining whether or not the temperature is within the usable condition range of the rolling bearing only by the temperature of the outer ring of the rolling bearing or only by the temperature of the inner ring of the rolling bearing largely depends on the housing cooling condition. It is difficult to accurately estimate the temperature difference between the inner and outer rings of the rolling bearing. Further, it is difficult to reliably prevent abnormal heat generation and seizure of the rolling bearing due to an excessively small internal clearance (effective clearance) of the bearing caused by an excessive difference in the inner and outer ring temperatures.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and accurately detects the temperature of the outer ring of a rolling bearing accurately even if the rolling bearing moves largely in the axial direction due to thermal expansion and contraction of the shaft body. It is an object of the present invention to provide a temperature detection device for a shaft support mechanism that can perform the temperature detection.

[0012]

According to a first aspect of the present invention, there is provided a temperature detecting device for a shaft supporting mechanism, which has a rolling bearing for rotatably supporting a shaft on a fixed side. In a temperature detection device of a shaft support mechanism for detecting a temperature of a shaft support mechanism, a temperature detection unit configured to detect a temperature of the temperature detection target by contacting a tip portion with the temperature detection target, and the temperature attached to the fixed side. A temperature detector body that slidably supports the detection unit, a sliding surface sealing portion that seals a gap between the temperature detection unit and the temperature detector body, and the temperature detector body that includes the temperature detection unit. Elastic means that constantly urges the rolling bearing with a constant force in a direction protruding therefrom, when the rolling bearing is axially moved, the temperature detection unit seals a gap with the temperature detector main body. Move forward and backward to follow the tip of the temperature detector. And maintains a state of contact between the gully bearing.

According to the temperature detecting device for the shaft supporting mechanism,
Since the temperature detecting section is slidable with respect to the detector main body and is always urged in the axial direction by an elastic means with a constant force,
Even if the rolling bearing moves largely in the axial direction of the shaft body due to thermal expansion and contraction of the shaft body, the temperature detection unit follows the bearing while maintaining the contact state without separating from the bearing. Therefore, the temperature of the rolling bearing can always be accurately detected. In addition, since the gap on the sliding surface between the detector body and the temperature detecting unit is sealed by the sliding surface sealing unit, the lubricant for the rolling bearing is prevented from leaking, and further, foreign matter is prevented from entering the bearing. Intrusion can be prevented.

The sliding surface sealing portion is inserted into the bush which is attached to the temperature detecting portion and has a wedge-shaped inclined surface on the tip end side of the temperature detecting portion, and the temperature detecting portion of the temperature detector main body. It may be an inclined inner wall surface formed in the insertion hole and facing the inclined surface of the bush. Further, the sliding surface sealing portion is provided with an O disposed in an insertion hole of the temperature detector main body.
It may be a ring.

According to this configuration, the inclined surface of the bush,
By contacting the edge of the inclined inner wall surface of the insertion hole facing this, the gap between the temperature detector and the temperature detector main body is closed, and the lubricant for the rolling bearing can be prevented from leaking out. In addition, foreign matter can be prevented from entering the bearing side. The O-ring can further improve the degree of sealing.

The inclination angle of the inclined surface of the bush with respect to the axial direction is preferably set smaller than the inclination angle of the inclined inner wall surface of the temperature detector main body.

[0017] With this, the tip of the slope of the bush is easily deformed by a small contact force between the slope of the bush and the inclined inner wall surface of the temperature detector main body. It is possible to easily control the gap between the parts.

Further, the temperature detecting device of the shaft support mechanism according to the present invention compares at least the temperature information output by the temperature detector with a preset allowable temperature, so that the occurrence of abnormality in the rolling bearing can be improved. It may be configured to include an abnormality alarm generating device that determines the presence or absence of an abnormality and outputs an abnormality occurrence signal when it is determined that an abnormality has occurred.

According to this configuration, it is determined whether or not the temperature of the rolling bearing, the internal clearance (effective clearance), the properties of the lubricant and the like are within the usable range of the rolling bearing. Outputs an abnormality occurrence signal such as an alarm or a machine stop signal.

Further, in the temperature detecting device for a shaft supporting mechanism according to the present invention, the temperature detecting portion is separated from the rolling bearing and fixed at a position immersed in a lubricant for the rolling bearing, so that the rolling bearing and the rolling bearing are fixed. It may be characterized in that both temperatures with the bearing lubricant are selectively detected.

According to this configuration, the temperature detecting portion is brought into contact with the rolling bearing to detect the temperature of the rolling bearing, while the temperature detecting portion is separated from the rolling bearing so that the tip of the temperature detecting portion is contained in the lubricant for the rolling bearing. By fixing at the immersed position, it is possible to detect the temperature of the rolling bearing lubricant, and it is possible to selectively detect both the temperature of the rolling bearing and the rolling bearing lubricant.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an example of a shaft support mechanism provided with a temperature detecting device according to the first embodiment of the present invention. The shaft support mechanism 100 shown in FIG. 1 is a shaft (roll) -rolling bearing system that is heated from the inside by a heating medium oil of a paper calender mill.

As shown in FIG. 1, the roll 10 has a roll neck portion 11 and 12 at both ends which are tightly fitted by taper fitting, and a fixed side bearing 15 fixed by bearing nuts 13 and 14 and a free side. The bearing 16 is rotatably supported by both rolling bearings. The fixed-side bearing 15 is fitted in the fixed-side bearing housing 17 with a gap, and is axially moved by a fixed-side bearing front cover 19 and a fixed-side bearing housing rear cover 20 having a sealing structure for sealing a lubricant 28 for a rolling bearing. Fixed.

The free-side bearing 16 is fitted in the free-side bearing housing 18 with a gap, and has a seal structure for sealing a lubricant 28 for a rolling bearing.
And the free side bearing housing rear lid 22 is attached. Between the outer ring (fixed ring) end face of the free side bearing 16 and the front end face 21 of the free side bearing housing and between the free side bearing 16 and the free side end face 22 of the free side bearing housing,
A predetermined axial gap δa (for example, 20 mm) is provided at room temperature. As a result, the free-side bearing 16 moves in the axial direction ±
δa (± 20 mm) can be slid. The fixed-side bearing housing 17 and the free-side bearing housing 18 are fixed to the mill frame 25.

Here, between the end face of the outer ring of the free-side bearing 16 and the end face of the front cover 21 of the free-side bearing housing, and between the end face of the outer ring of the free-side bearing 16 and the end face of the rear cover 22 of the free-side bearing housing, respectively. The reason for providing the gap δa is as follows. That is, the free-side roll neck portion 12 is also heated by the heat medium 37 entering and exiting the heat medium entrance / exit shaft end 32,
In addition, the fixed-side roll neck 11 is also heated by the heat conduction from the body 10a of the roll 10 that has become hot, and the rolling bearings of both the fixed-side bearing 15 and the free-side bearing 16 are also heated.

For this reason, the heat resistance and dimensional stability of the rolling bearing material are required, and severe operating conditions for the rolling bearing are required, such as a large change in the internal clearance (effective clearance) of the bearing. Further, as the temperature of the entire roll 10 increases, the free-side bearing 16 slides about 15 mm at the maximum in the axial direction with respect to the free-side bearing housing 18 due to extension caused by thermal expansion of the entire roll. From such a thing,
Clearances δa are provided between the outer ring end face of the free side bearing 16 and the end face of the free side bearing housing front lid 21 and between the outer ring end face of the free side bearing 16 and the free side bearing housing rear lid 22 respectively. The expansion and contraction in the axial direction caused by the thermal expansion and contraction of the entire roll are absorbed.

In FIG. 1, a roll 10 is driven by a drive-side shaft end 2 by, for example, a spindle coupling (not shown).
6 is driven to rotate. The fixed-side bearing housing 17 and the free-side bearing housing 18 are always supplied with a certain amount of lubricant 28 and drained so that a proper amount of lubricant 28 for rolling bearings is filled. That is, the forced circulation lubrication is performed inside each housing.

In the body 10a of the roll 10 of the paper calender mill in the present embodiment, together with the body of the other roll, a workpiece (papermaking material) 30 requiring a compression operation at about 150 to 160 ° C. Because of the contact, a heating medium (eg, oil) 37 of about 200 ° C. is circulated inside the body 10 a of the roll 10 through a rotary junction 35 attached to the heating medium entrance / exit shaft end 32, so that the body is always in operation. Part 1
The surface of Oa is kept at a temperature suitable for the compression work.

Next, a temperature detecting device applied to the shaft support mechanism 100 will be described. First, the position of the temperature detector will be described. In the present embodiment, due to the structure of the paper calender mill, there are devices such as a driving device around the fixed bearing housing 17. For this reason, it is difficult to secure a space for attaching the temperature detector and a space for wiring around the fixed bearing housing 17. In the present embodiment,
Since the heat medium 37 for heating the roll 10 is passed through the free side roll neck portion 12, it is expected that the free side bearing 16 is more likely to cause a temperature change. For this reason, the temperature detecting device of the present embodiment has a configuration in which a temperature detector is mounted around the free-side bearing housing 18 to detect and monitor the temperature of the free-side bearing 16.

FIG. 2 is a view showing the arrangement of the temperature detector provided around the free-side bearing 16. A lubricant oil temperature detector 38 and a lubricant oil temperature sensor 39 on the free side bearing 16 side
Is a compression fitting type sheath type thermocouple (see FIG. 10), an inner ring temperature detector 40 for detecting the inner ring temperature of the free-side bearing 16 is a crystal oscillation type temperature detector, and an outer ring for detecting the outer ring temperature. The temperature detector 41 is composed of a sheath-type thermocouple in which the support structure of the temperature detecting section is improved. The electric signals output from these temperature detectors are output to an abnormality alarm generator described later via signal lines.

The inner ring temperature detector 40 for detecting the inner ring temperature of the free-side bearing 16 has a built-in detector having a built-in crystal oscillator whose vibration frequency increases as the temperature rises. The temperature of the inner ring is detected by detecting the vibration frequency from the transmitter via radio waves and converting it into temperature. Details of the temperature detector 40 are described in, for example,
Since it is described in JP-A-118662, please refer to it as needed.

FIG. 3 shows a specific mounting state of the inner ring temperature detector 40. The temperature detector 40 includes a transmitting unit 40a having a built-in crystal oscillator that transmits a signal corresponding to a temperature.
And a receiving unit 40b for receiving a signal transmitted from the transmitting unit 40a and propagating in the air.

The transmitting portion 40a is provided on the inner ring 1 of the free side bearing 16.
6a is preferably attached directly to the bearing inner ring 16a because of its high hardness.
It is difficult to provide notches and screw holes for attachment in 6a. Further, it is difficult to secure such an arrangement space for the free side bearing inner ring 16a, which is not preferable in terms of the strength of the bearing. For this reason, in the present embodiment, the transmitting portion 40 is attached to the bearing nut 14 pressed against the end surface of the free-side bearing inner ring 16a in which the mounting notch and the screw hole are relatively easily processed.
is attached to detect the temperature of the free side bearing inner ring 16a. The receiving section 40b is mounted on the front cover 21 of the free-side bearing housing via a bracket 50 for mounting the receiver.

According to the inner ring temperature detector 40 mounted as described above, the temperature can be detected satisfactorily even if the shaft (roll 10) undergoes thermal expansion and contraction in the axial direction due to a temperature change. Specifically, the transmitting part 40a attached to the free-side bearing nut 14 is 15 mm in the + direction or 15 mm in the negative direction in the axial direction with respect to the center position of the receiving part 40b attached to the free-side bearing housing front cover 21. Even when moving, the signal output from the transmitting unit 40a can be received by the receiving unit 40b. When the amount of movement in the axial direction is large and a signal transmission failure occurs, the receiving unit 40b may be attached to two places. The mounting arrangement of the two receiving sections 40b is as follows. That is, 180 in the circumferential direction.
。 At the opposing position, the two receivers 40b are axially displaced in the axial direction within the overlapping range.
This enables reliable temperature detection without causing signal transmission failure.

On the other hand, an outer ring temperature detector 41 which is a characteristic part of the present invention for detecting the temperature of the outer ring of the free side bearing 16 is provided.
Is a sheath-type thermocouple having an improved support structure as shown in FIG. FIG. 4 shows the free side bearing 16 of the outer ring temperature detector 41.
FIG. 5 shows an outer ring temperature detector 4 attached to the outer ring.
1 is a diagram showing a detailed structure of FIG.

As described above, the roll 10 of the papermaking calender mill of the present embodiment is used in a state where the heat medium 37 is circulated inside the roll 10 and is heated to a high temperature. The expansion and contraction in the axial direction is large, and the free-side bearing outer ring 16 b slides largely in the axial direction with respect to the free-side bearing housing 18. Further, due to restrictions on the structure of the free-side bearing housing 18 and the space around the free-side bearing housing 18, the outer ring temperature detector 41 allows the temperature detector to pass through the free-side bearing housing front cover 21 as shown in FIG. It is inevitable that the side bearing outer ring 16b should be attached to the end surface of the outer ring 16b at a substantially right angle. Therefore, the axial direction of the temperature detecting portion of the outer ring temperature detector 41 substantially coincides with the sliding direction of the free-side bearing outer ring 16b.

For this reason, when the temperature of the roll 10 decreases and the roll 10 contracts, the temperature detecting portion of the outer ring temperature detector 41 separates from the end surface of the free side bearing outer ring 16b to reduce the temperature of the free side bearing outer ring 16b. It cannot be detected.
Conversely, when the temperature of the roll 10 rises and the roll 10 extends, the temperature detecting portion of the outer ring temperature detector 41 and the end surface of the free-side bearing outer ring 16b are strongly pressed, and the outer ring temperature detector 41 is damaged, such as bending or buckling. Is more likely to occur.

Therefore, the outer ring temperature detector 41 of the present embodiment
Has improved the support structure of the temperature detecting section as shown in FIG. FIG. 5 is a diagram showing a detailed configuration of the outer ring temperature detector 41. As shown in FIG. 5, the outer ring temperature detector 41 includes a rod-shaped thermocouple sheath (temperature detection unit) 60 for detecting the temperature at the tip end, and a fixed side (the front side of the free-side bearing housing) through which the thermocouple sheath 60 is inserted. A main body (temperature detector main body) 61 screwed and fixed to the lid 21), an O-ring 62 housed in a groove formed on the inner peripheral surface of the main body 61 for preventing leakage of lubricant and entry of foreign matter, A thermocouple sheath 60 inside
(Soloban ball) 6 which is held by inserting
3, a main body cover 64 for preventing the solo ban ball 64 from coming out of the main body 61, a first spring 65 for pressing the solo ban ball 64 in the axial direction, and a spring for fixing the first spring 65 to the main body cover 64. A mounting ring 66, a second spring (elastic means) 67 for pressing the thermocouple sheath 60 with a constant force in the axial direction, a bayonet 68, a pressing force adjusting ring 69 for adjusting the pressing force of the second spring, and It is provided with a fixing screw 70. The O-ring 62 and the solo bang 63 correspond to a sliding surface sealing portion.

The O-ring 62 is in close contact with the surface of the thermocouple sheath 60, and prevents leakage of the bearing lubricant 28 and entry of foreign matter even when the thermocouple sheath 60 slides in the axial direction. When used in a high temperature environment as in this embodiment, the O-ring 6
It is preferable to use a heat-resistant material such as a fluorine-based rubber as the second material.

As shown in FIG. 6, which is a partially enlarged view of a portion A of FIG. 5, the solo bang 63 is attached to the outer periphery of the thermocouple sheath 60, and a wedge-shaped inclined surface is provided on the distal end side of the thermocouple sheath 60. 63a. An inclined inner wall surface 61a is formed in an insertion hole through which the thermocouple sheath 60 of the main body 61 is inserted so as to face the inclined surface 63a.
3 is an edge portion 61b of the inclined inner wall surface 61a.
, The gap between the thermocouple sheath 60 and the main body 16 is closed with a small axial pressing force. Also,
The solo ban ball 63 is constantly pressed by a first spring 65 attached to the main body cover 64 and the spring attachment ring 66 with a constant moderate axial force so as not to fix the thermocouple sheath 60 by high pressure. ing. The gap between the inner diameter portion of the solo ban ball 63 and the outer diameter portion of the thermocouple sheath 60 is set so that the thermocouple sheath 60 can slide in the axial direction. Dripping.
Due to this high confidentiality, even if the lubricant 28 for the bearing leaks from the O-ring 62, the soloban ball 63
Thus, leakage of the lubricant 28 can be prevented.

As the material of the solo bang 63, a PTFE material having heat resistance, a low friction coefficient and a low rigidity can be suitably used. The inclination angle of the inclined surface 63 a of the solo ban ball 63 with respect to the axial direction is set smaller than the inclination angle of the inclined inner wall surface 61 a of the main body 61. That is, Soloban ball 63
The gap between the outer diameter of the thermocouple sheath 60 of the cone apex angle theta ₁ of the distal end portion is made smaller than the cone apex angle theta ₂ of the main body 61 side, a relatively small axial pressing force of the first spring 65 Is set to approximately 0, and the optimum shape is achieved with low rigidity.

The first spring 65 is made of metal.
It is also possible to use a spring made of an elastic material such as resin or rubber.

The second spring 67 has a bayonet 68 attached to the trunnion of the main body 61 and a thermocouple sheath 6.
A tension coil spring for pressing the temperature detecting portion 60a of the thermocouple sheath 60 against the end surface of the free-side bearing outer ring 16b, which is the temperature detecting portion, between the pressing force adjusting ring 69 and the pressing force adjusting ring 69 attached to the tail portion of the thermocouple sheath 60. .

The free-side bearing outer ring 16b, which is a temperature detection part,
To adjust the pressing force to the end face, the assembly of the temperature detector 41 is screwed into the female screw hole provided in the front lid 21 of the bearing housing, and the assembly of the temperature detector 41 is fixed. Next, the thermocouple sheath 60 is slid toward the outer ring 16b in the axial direction, so that the temperature detector 60a of the thermocouple sheath 60 is moved.
Is brought into contact with the end face of the outer ring 16b. Thereafter, the fixing screw 70 of the pressing force adjusting ring 69 is loosened, and the second spring 67 is released.
Is stretched. That is, the pressing force adjusting ring 69 that has been released is pulled backward with a predetermined pressing force, and the pressing force adjusting ring 69 is fixed at a predetermined position of the thermocouple sheath 60 with the fixing screw 70.

By attaching the temperature detector 41 to the front cover 21 of the bearing housing in this manner, the free-side bearing outer ring 1 is provided.
6b slides axially largely (about ± 15 mm) with respect to the free-side bearing housing 18 (about ± 15 mm).
Of the thermocouple sheath 60 by the pressing action of the free side bearing outer ring 1
Following the axial movement of 6b, the temperature detector 60a of the thermocouple sheath 60 is always in contact with the end surface of the free-side bearing outer ring 16b. Further, the temperature detecting portion 60a is constantly pressed against the end surface of the outer ring 16b with a substantially constant force by the elasticity of the second spring 67, and the temperature of the free-side bearing outer ring 16b can be reliably detected. And the second spring 67 is made of metal,
A spring made of an elastic material such as resin or rubber can be used, and a hydraulic or pneumatic cylinder or the like can also be used.

The thermocouple sheath 60 of the temperature detector 41
Is preferably set perpendicular to the end face of the free-side bearing outer ring 16b. However, if it cannot be set vertically due to the structure, as shown by the inclination angle α in FIG.
It may be set at an angle of about 0 degrees. Further, the temperature detector 41 is not limited to the free side, but can be applied to the temperature detection of the outer ring of the fixed-side bearing. Then, as described above, by detecting the temperature of the bearing by providing both the inner ring temperature detector 40 and the outer ring temperature detector 41, it is compared with a method of measuring only one temperature and estimating the other temperature. As a result, the temperature detection accuracy can be significantly improved.

Next, each of the temperature detectors 38, 39,
An abnormality alarm generation device that determines the presence or absence of an abnormality based on the temperature data detected by 40 and 41 and generates an alarm or the like when an abnormality occurs will be described. FIG. 7 is a block diagram showing a schematic configuration of the abnormality alarm generation device 80 of the present embodiment. As shown in FIG. 7, the abnormality alarm generating device 80 includes a setting unit 80a for setting an allowable temperature for each temperature measurement position.
And a comparison judging unit 8 for comparing each detected temperature with each allowable temperature.
0b, and a bearing abnormality alarm output unit 80c that outputs an abnormality generation signal such as an alarm generation signal or a device stop signal based on the determination output of the comparison determination unit 80b.

Free side bearing inner ring temperature obtained by each temperature detector: t _B Free side bearing outer ring temperature (upper): t _AU Free side bearing outer ring temperature (lower): t _AB Free side bearing lubrication temperature: t _{O− IN} oil discharge temperature: t _O-OUT is set to each allowable temperature set in advance: t _Bo , t _A-Uo ,
Compare with t _A-Bo , t _O-INo , and t _O-OUTo . Furthermore, the free side bearing outer ring temperature (upper) t _AU and the free side bearing outer ring temperature (lower)
Even if the absolute value of t _AB is equal to or lower than the allowable temperature, if the difference is significant, it is conceivable that the free-side bearing 16 is abnormal or deformed. Therefore, the temperature difference between the free-side bearing outer ring temperatures (upper) and (lower): (t _AB −t _AU ) is also compared with a preset allowable temperature difference: (t _AB −t _AU ) ₀ .

Regarding the temperature of the lubricant 28 for the free side bearing, even if the absolute values of the lubrication temperature and the drainage temperature are each lower than the allowable temperature, if the difference is remarkable, the free side bearing 16 generates abnormal heat. It is thought that it is doing. For this reason,
The difference between the oil discharge temperature and the oil supply temperature: (tO _-OUT- tO _-IN ) is also compared with a preset allowable temperature difference: (tO _-OUT- tO _-IN ) ₀ .

Further, when the temperature difference between the inner and outer races of the free-side bearing exceeds the expected value, the difference in thermal expansion between the inner and outer races becomes excessive, and the internal clearance (effective clearance) of the bearing becomes too small. Heat generation or burn-in may occur.
Therefore, the value of the temperature difference between the inner and outer rings is compared with the allowable temperature difference. When calculating the temperature difference between the free side bearing inner and outer rings, the outer ring temperature is the free side bearing outer ring temperature (top): t _AU and the free side bearing outer ring temperature
(Lower): Average value with t _AB t _Amean = (t _AB + t _AU ) / 2 is used. Thus, the free side outer ring temperature differential in the bearing _{is, t B -t Amean = t B} - a _{(t AB + t AU) /} 2.

The temperature of the free side bearing outer ring 16b (lower):
The detection position of t _AB is near the position (maximum rolling element load position) where the load received by the free-side bearing rolling element 16c (see FIG. 3) becomes maximum, and the temperature of the free-side bearing outer ring 16b (upper): t
The detection position of _AU is 18 points on the circumference with respect to the detection position of t _AB.
This is the opposing position at the 0 ° position. When the temperature detection positions of the free-side bearing outer ring 16b are three or more, one is located near the maximum rolling element load position, and the others are arranged evenly around the circumference including the location near the maximum rolling element load position. It is preferable to use the average value of all temperature detection points as the average temperature.

The above temperatures and the allowable values of the respective temperature differences are compared with each other. If at least one of the items exceeds the allowable temperature or the allowable temperature difference, a warning that the free-side bearing 16 is abnormal is issued. Output. Further, a device stop signal may be output instead of the alarm, or both the alarm and the device stop output may be output. Further, in addition to the abnormality alarm generating device 80, a temperature recording device that records the temperature detected by each temperature detector is provided, and the statistical change of the temperature recorded in the temperature recording device and the temperature change status of each position are recorded. It may be configured to judge the occurrence of an abnormality by performing an integrated evaluation. In this case, the judgment of the occurrence of the abnormality can be made more accurate.

As described above, according to the temperature detecting device of the present embodiment, the thermocouple sheath 60 of the temperature detector 41 is made slidable with respect to the main body 61, and furthermore, is axially moved by the second spring 67. It has a support structure that biases.
Therefore, when the temperature of the outer ring 16b is measured by bringing the temperature detecting portion 60a into contact with the side surface of the bearing outer ring 16b, even if the outer ring 16b slides largely in the axial direction with respect to the bearing housing due to thermal expansion and contraction. The temperature detecting portion 60a, which is the distal end portion of the thermocouple sheath 60, follows the outer ring 16b without departing from the side surface thereof, so that the contact between the temperature detecting portion 60a and the side surface of the outer ring 16 is always maintained, and the accurate temperature of the rolling bearing outer ring is maintained. Can be detected. The main body 6 of the temperature detector 41
In the part where the thermocouple sheath 60 slides through 1
Since the O-ring 62 and the solo ball 63 are provided, leakage of the lubricant for the rolling bearing and entry of foreign matter into the free-side bearing housing 18 are reliably prevented.

Next, a description will be given of a second embodiment of the temperature detecting device for the shaft support mechanism according to the present invention. FIG. 8 is a view showing a state in which the temperature detecting device of the present embodiment is attached to the free side bearing outer ring 16b. The temperature detector of the present embodiment uses the temperature detector 41 shown in FIG. This temperature detector 41
Is fixed by screwing the thread portion of the main body 61 into a female screw hole provided in the free side bearing housing front lid 23, and supports the thermocouple sheath 60 slidably in the axial direction toward the free side bearing outer ring 16b. The temperature detecting portion 60a at the tip is immersed in the pool of the lubricant 28 and is mounted at a position where it can abut on the free side bearing outer ring 16b. This single temperature detector 41 can selectively detect both the temperature of the free-side bearing outer ring 16b and the temperature of the lubricant 28 for the free-side bearing, thereby reducing costs without providing a separate temperature detector. be able to.

When detecting the temperature of the lubricant 28 for the free side bearing, first, the temperature detecting section 60 of the thermocouple sheath 60 is used.
a is retracted into the lubricant pool away from the end face of the free-side bearing outer ring 16b, and the second spring 67 for pressing the temperature detecting portion 60a against the end face of the free-side bearing outer ring 16b is in a free state (natural length). State) and press force adjustment ring 6
9 is fixed to the thermocouple sheath 60 with the fixing screw 70, and the thermocouple sheath 60 is fixed in the axial direction. Thus, the temperature detecting section 60a can detect the temperature of the lubricant 28. When the temperature of the free-side bearing outer ring 16b is detected, the temperature detecting portion 60a of the thermocouple sheath 60 is brought into contact with the end surface of the free-side bearing outer ring 16b, as in the first embodiment, and the pressing force adjusting ring is formed. Loosen the fixing screw 70 of the
The pressing force adjusting ring 69 is fixed to a predetermined position of the thermocouple sheath 60 by a fixing screw 70. When a large pressing force is required on the free-side bearing outer ring 16b, a notch at which the tip of the fixing screw 70 is locked is used to secure the pressing force adjusting ring 69 to the thermocouple sheath 60. Preferably, 71 is provided on the thermocouple sheath 60.

FIG. 8 shows a system in which the position of the thermocouple sheath 60 is manually changed. However, if a hydraulic or pneumatic cylinder, an electric actuator or the like is used, remote control or automatic control operation can be performed. It is possible.

The detection of both the temperature of the free-side bearing outer ring 16b and the temperature of the free-side bearing lubricant 28 by the single temperature detector 41 is not limited to the free side. The same can be applied to the temperature detector.

Next, a description will be given of a third embodiment of the temperature detecting device for the shaft support mechanism according to the present invention. FIG. 9 is a diagram showing a state in which the temperature detection device of the present embodiment is attached to the free side bearing outer ring 16b. The temperature detector 42 of the temperature detector of the present embodiment is configured such that the temperature detector 60a at the distal end of the thermocouple sheath 60 of the temperature detector 41 shown in FIG. 5 can reliably contact the free-side bearing outer ring 16b. Make up.

That is, the temperature detector 42 is connected to the thermocouple sheath 8.
A second spring 87 for pressing which causes the zero temperature detector 80a to follow the end surface of the free-side bearing outer ring 16b,
A spring receiving ring 88 provided at the end face of the free side bearing outer ring 16 of the temperature detector main body 81 and the tip of the thermocouple sheath 80.
It is configured to be attached between As the second spring 87, for example, a compression coil spring can be used.

According to the temperature detector 42, when the temperature of the free-side bearing outer ring 16b is detected, the fixing screw 90 is loosened, so that the temperature detecting section 80a of the thermocouple sheath 80 is always controlled by the second spring 87. Free side bearing outer ring 16
Thus, the temperature of the free-side bearing outer ring 16b can be reliably detected.

When detecting the temperature of the lubricant 28 for the free side bearing, the temperature detector 80 of the thermocouple sheath 80 is used.
After a is retracted into the lubricant reservoir at a position sufficiently distant from the end surface of the free-side bearing outer ring 16b, the thermocouple sheath 80 is fixed with the fixing screw 90. The thermocouple sheath 80 may have a configuration in which a notch 89 for locking the fixing screw 90 is provided at a desired position, and the fixing position of the temperature detecting unit 80a can be easily set.

In this embodiment, the thermocouple sheath 80 is used.
It is a method of manually changing the position of, but if you use a hydraulic or pneumatic cylinder or electric actuator,
Remote operation and automatic control operation are also possible.

The detection of both the temperature of the free-side bearing outer ring 16b and the temperature of the free-side bearing lubricant 28 by the single temperature detector 42 is not limited to the free side. The same can be applied to the temperature detector.

[0064]

According to the present invention, the temperature detecting section is slidably supported on the detector main body and is always urged in the axial direction with a constant force by the elastic means. expansion·
Even if the rolling bearing moves largely in the axial direction of the shaft due to shrinkage, the temperature detecting section follows the contact state without separating from the rolling bearing. Therefore, the temperature of the rolling bearing can always be accurately detected. Also, since the gap between the sliding surface between the detector body and the temperature detecting portion is sealed by the sliding surface sealing portion, it is possible to prevent the lubricant for the rolling bearing from leaking out and foreign substances from entering the bearing side. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a shaft support mechanism provided with a temperature detecting device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an arrangement of a temperature detector provided around a free-side bearing.

FIG. 3 is a diagram showing a specific mounting state of an inner ring temperature detector.

FIG. 4 is a view showing a state in which an outer ring temperature detector is attached to a free side bearing.

FIG. 5 is a diagram showing a detailed structure of an outer ring temperature detector.

FIG. 6 is a partially enlarged view of a portion A in FIG. 5;

FIG. 7 is a block diagram illustrating a schematic configuration of an abnormality alarm generation device.

FIG. 8 is a view showing a state in which the temperature detecting device of the second embodiment is attached to a free-side bearing outer ring portion.

FIG. 9 is a diagram showing a state in which the temperature detecting device according to the third embodiment is attached to a free-side bearing outer ring portion.

FIG. 10 is a view showing a conventional compression fitting type sheath-type temperature detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Roll 16 Free side bearing 18 Free side bearing housing 28 Lubricant 37 Heat medium 40, 41, 42 Temperature detector 60, 80 Thermocouple sheath 61, 81 Main body 62, 82 O-ring 63, 83 Soroban ball 65, 85 1st Spring 67, 87 Second spring 69 Pressing force adjusting ring 70, 90 Fixing screw 80 Abnormality alarm generator 80a Setting section 80b Comparison / determination section 80c Bearing abnormality alarm output section

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01K 7/02 G01K 7/02 7/32 7/32 C 13/08 13/08 B (72) Inventor Kazutoshi Sakaguchi 1-5-50 Kugenuma Shinmei, Fujisawa-shi, Kanagawa F-term in NSK Ltd. (reference) 2F056 AE03 AE05 CA08 CA15 CB01 CE01 CL13 DA01 EM05 KC04 KC08 KC13 WA03 3J059 AA09 BA01 BB03 DA33 GA50 AJA3 AA62 CA05 CA32 GA60 3J103 AA02 AA24 AA45 AA77 BA09 BA22 CA03 CA63 CA78 DA05 FA18 FA21 FA22 GA02 GA12 GA23 GA26 GA52 GA55

Claims (1)

[Claims] 1. A temperature detecting device for a shaft supporting mechanism having a rolling bearing for rotatably supporting a shaft body on a fixed side, wherein the temperature detecting device detects a temperature of the shaft supporting mechanism. A temperature detector that detects the temperature of the temperature detection target, a temperature detector body attached to the fixed side and slidably supporting the temperature detector, and a temperature detector between the temperature detector and the temperature detector body. A sliding surface sealing portion that seals a gap; and elastic means that constantly urges the temperature detecting portion with a substantially constant force in a direction protruding from the temperature detector main body, wherein axial movement occurs in the rolling bearing. A shaft support, wherein the temperature detector moves forward and backward in a state of sealing the gap with the temperature detector main body while sealing, and maintains a contact state between the tip of the temperature detector and the rolling bearing. Mechanism temperature detector.