JP2001116041A - Rolling bearing with abnormal temperature detecting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To clearly know an abnormal temperature by means of visual observation, to require no excess time for installing a bearing, and to simplify the constitution at a low cost. SOLUTION: A detecting member 6 is arranged so as to be housed in an annular space between inner/outer races 1, 2. The detecting member 6 uses a shape memory alloy, and projects from a bearing end part by being deformed when an internal temperature of a bearing rises to a prescribed temperature or more. The detecting member 6 is formed, for example, in a ring-like disk shape, and also preferably serves as a shield plate. The detecting member 6 is preferably constituted of a regulating member by the shape memory alloy and a spring member for regulating projection from the regulating member and the bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing having an abnormal temperature detecting function capable of detecting an abnormal temperature rise when a bearing is used.

[0002]

2. Description of the Related Art In various types of bearings, it is desired to detect an abnormal temperature rise during use of the bearing in order to confirm the proper use state of the bearing itself and the equipment using the bearing. As such a temperature detecting means when the bearing is used, there is a means for monitoring by attaching a thermoelectric heat or electric temperature sensor. Further, if a temperature label or the like is attached to the bearing, it is possible to detect a certain temperature.

[0003]

However, in the case of attaching and monitoring the above-mentioned thermoelectric heat or electric temperature sensor, it takes time and effort to install the sensor, and it is necessary to provide additional equipment for processing a detection signal. Becomes complicated and the cost increases. In the case of the temperature label, the condition is that there is no dirt or the like in the periphery and the color can be identified, and the detection becomes unclear at a portion that is stained with grease or the like.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing with an abnormal temperature detecting function, which can clearly identify an abnormal temperature by visual inspection, does not require extra time for mounting the bearing, and has a simple and inexpensive structure. That is.

[0005]

A rolling bearing with an abnormal temperature detecting function according to the present invention is provided with a detecting member which is mounted on an end of the rolling bearing and fits in an annular space between inner and outer rings. This detecting member is made of a shape memory alloy, and is deformed and protrudes from the bearing end when the internal temperature of the bearing rises above a predetermined temperature. The detection member may be entirely made of a shape memory alloy, or may be a part using a shape memory alloy. According to this configuration, when the internal temperature of the bearing rises above the predetermined temperature, the detection member projects from the bearing end. Therefore, the abnormal temperature rise can be clearly recognized visually. Since the detection member is housed in the bearing, the operation of attaching the bearing to the equipment using the bearing is the same as that of a normal bearing, and does not require much labor. In addition, since the detection member is for recognizing temperature abnormality by a shape change and does not generate an electric signal or the like,
No additional equipment such as signal processing means is required, the structure is simple, and the cost is low.

In the present invention, the detection member is disposed in a state of being biased so as to protrude out of the bearing in an annular space between the inner and outer rings, and the protrusion is restricted by the restriction member. It is good also as what consists of a spring member performed. The restricting member is deformed when the internal temperature of the bearing rises to a predetermined temperature or higher, and releases the protrusion restriction of the spring member. In the case of this configuration, the regulation member is deformed by the rise in the internal temperature of the bearing, and the projection regulation of the spring member is released. Thereby, the spring member protrudes out of the bearing.
Therefore, the abnormal temperature can be recognized by looking at the protrusion of the spring member.
Further, in the case where the detection member is constituted by the regulating member and the spring member in this manner, the spring member can be greatly protruded from the bearing by a slight shape change of the shape memory alloy, and the abnormality can be more easily visually detected. Become.

In the present invention, the detection member is a shield plate which has a circular disk shape, is attached to the inner diameter portion of the outer ring end, and forms a predetermined annular gap between the detection member and the inner ring outer diameter surface. May be. In this way, by making the detection member also function as a shield plate, it is possible to improve the sealing effect or reduce the number of parts while having an abnormal temperature detection function. In addition, since the detection member is a single member, if a shape memory alloy made of a material that restores its original shape due to a decrease in temperature is used, the abnormal state can be resolved in an initial state without any manual treatment when the abnormal temperature is resolved. Return

In the present invention, when the detecting member is composed of a regulating member and a spring member, the spring member may be a coil spring that is biased and accommodated in the axial direction. Also,
The spring member may be a bamboo shoot spring that is housed by being biased in the axial direction. As described above, when the spring member is a coil spring or a bamboo spring, the amount of protrusion from the bearing at the time of abnormal temperature rise and the abnormal temperature rise can be increased, making it easier to visually determine the abnormal temperature. Become.

In the present invention, the detection member may be a coil spring or a bamboo-spring-like spring member, and may extend in the axial direction when the internal temperature of the bearing rises to a predetermined temperature or higher. good. Thus, by making the detection member a coil spring or a bamboo child spring shape,
Normally, it is small, and the amount of protrusion from the bearing at the time of abnormal temperature rise can be increased, making it easier to visually determine abnormal temperature. Moreover, since the detecting member is formed of a single spring member, it can be restored to the initial state when the abnormal temperature is eliminated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. This rolling bearing with an abnormal temperature detection function is a rolling bearing in which a plurality of rolling elements 3 are interposed in the circumferential direction between an inner ring 1 and an outer ring 2, and a detection member 6 made of a shape memory alloy is provided. The rolling element 3 is made up of rollers and is held by a retainer 4 so that the inner flange 2a
It is arranged between 2a. The cage 4 may be omitted and a full roller bearing may be used. Seals 5 are provided near both ends of the annular space between the inner and outer rings 1 and 2. Seal 5 is outer ring 2
And the inner diameter portion is in contact with or close to the outer diameter surface of the inner ring 1. These seals 5 may also be omitted.

The detecting member 6 has an annular disk shape and is mounted on the inner diameter of the end of the outer race 2. This mounting is performed by fitting the detection member 6 into an annular mounting groove provided on the inner diameter surface of the outer ring 2. The detection member 6 has a predetermined annular gap between the inner diameter portion and the outer diameter surface of the inner ring 1, and also serves as a shield plate. As shown in FIG. 2, the detecting member 6 has cuts 7 cut from the inner diameter edge toward the outer diameter at a plurality of locations in the circumferential direction, and a portion between the adjacent cuts 7, 7 is a tongue piece 6a. It has become. Notch 7
Are formed by slits. The detection member 6 is entirely made of a shape memory alloy, and is deformed and protrudes out of the bearing when the internal temperature of the bearing rises above a predetermined temperature. The above-mentioned predetermined temperature is, for example, a temperature at which the bearing temperature becomes abnormal if it rises more than that. This deformation is performed such that each tongue piece 6a of the detection member 6 is bent outward as shown in FIG. The shape memory alloy desirably restores the initial disk shape when the temperature of the bearing returns to the normal temperature, but may not restore the initial shape. Further, this disk-shaped detection member 6
May be formed by joining a plurality of members having different materials, and using a shape memory alloy for only some of the members.

According to this configuration, when the bearing temperature rises abnormally during use of the bearing, the detection member 6 protrudes out of the bearing as shown by an arrow in FIG. Therefore, by visually observing the protrusion, the abnormality of the bearing temperature can be clearly seen at a glance. Further, since the detecting member 6 is for recognizing temperature abnormality by a change in shape and does not generate an electric signal or the like, ancillary equipment such as signal processing means is unnecessary, the structure is simple, and the cost is low. Further, even at the time of assembling into a device using a bearing, since the detection member 6 is settled in the bearing at a normal temperature, the work of mounting the bearing on the device using the bearing can be performed in the same manner as a normal bearing, and the labor is reduced. It does not take. In this embodiment, since the detection member 6 also functions as a shield plate, the sealing effect is improved. Therefore, the seal 5 on the detection member 6 side can be omitted.

FIG. 3 shows another embodiment of the present invention. In this example, a coil-shaped detection member 6A entirely made of a shape memory alloy is provided in place of the disk-shaped detection member 6 in the embodiment of FIG. This detection member 6
At the normal temperature of the bearing, A takes a form in which a leaf spring is densely wound in a spring shape as shown in FIG.
When the temperature rises above a predetermined temperature, as shown in FIG. 3B, the material is deformed so as to be unraveled and extended in the axial direction. Other configurations of the rolling bearing with an abnormal temperature detection function are the same as those of the embodiment of FIG. In the case of this configuration, if an abnormal temperature rises during use of the bearing, as shown in FIG. 7B, the spring-shaped detection member 6A is unraveled in the axial direction and protrudes from the bearing. I understand.

FIG. 4 shows still another embodiment of the present invention. This embodiment is different from the embodiment shown in FIG. 1 in that, in place of the detection member 6 in the form of a single disk, a restricting member 8 using a shape memory alloy and a spring member whose projection is restricted by the restricting member 8 9 is provided.
The restricting member 8 is a ring-shaped member having an outward groove shape in cross section. The flange 8 a on the inner side of the bearing is fitted to a mounting groove provided in the outer ring 2 and mounted on the outer ring 2. The regulating member 8 is entirely made of a shape memory alloy, and when the internal temperature of the bearing rises to a predetermined temperature or higher, the outer flange portion 8
b is deformed so as to extend linearly from the web portion 8c as shown in FIG. A bamboo shoot spring is used for the spring member 9, and both flanges 8 of the regulating member 8 are used.
a and 8b are compressed and accommodated in an axially urged state. The other configuration in this embodiment is shown in FIG.
This is the same as the embodiment.

In this configuration, the detection member 6B is normally contained in the bearing as shown in FIG. 4A, but when the internal temperature of the bearing rises to a predetermined temperature or more during use of the bearing,
The outer flange portion 8b of the regulating member 8 extends as shown in FIG. Therefore, the spring member 9 extends freely and projects from the end of the bearing. Looking at the protrusion of the spring member 9, an abnormality in the bearing temperature is detected. In this embodiment, the shape memory alloy will be used as a trigger, so to speak.

FIG. 5 shows still another embodiment of the present invention. This embodiment uses a spring member 9C made of a coil spring instead of using a bamboo shoot spring for the spring member 9 in the embodiment of FIG. That is, the detection member 6C is constituted by the regulating member 8 having the same configuration as that of the example of FIG. 4 and the spring member 9C made of a coil spring. Other configurations in this embodiment are the same as those in the embodiment of FIG. In the case of this embodiment as well, when the bearing temperature rises abnormally, the spring member 9C protrudes from the bearing as shown in FIG.

Although the above embodiments have been described with reference to the case where the present invention is applied to a roller bearing, the present invention relates to a ball bearing and the like.
It can be applied to rolling bearings in general. The embodiment shown in FIGS. 6 and 7 has a ball bearing provided with the same detection member 6 as the embodiment of FIG. The embodiment shown in FIG. 8 is the same as the embodiment shown in FIG.
A is provided. The embodiment shown in FIG. 9 has a ball bearing provided with the same detection member 6B as the embodiment of FIG. In FIGS. 6 to 9, portions corresponding to the examples in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will be omitted. In the examples of FIGS.
Is a ball bearing, so that a rolling groove having an arc-shaped cross section is formed.

[0018]

According to the rolling bearing with an abnormal temperature detecting function of the present invention, a detecting member which is attached to an end of the rolling bearing and fits in an annular space between the inner and outer rings is provided, and the detecting member is made of a shape memory alloy. When the internal temperature of the bearing rises above a predetermined temperature, it deforms and protrudes from the end of the bearing, so the abnormal temperature can be clearly seen visually, and no extra time is required for mounting the bearing. Can be simple and cheap. In the case where the detecting member is constituted by a regulating member using a shape memory alloy and a spring member whose projection is regulated by the regulating member, the detecting member can easily be largely protruded from the bearing and can be visually checked. Makes it easier to recognize abnormal temperatures. When the detection member also functions as a shield plate, it is possible to improve the sealing effect, omit the sealing component, and the like. When the spring member is a coil spring or a bamboo child spring, it can be made to protrude largely from the bearing end, making it easier to visually recognize abnormal temperatures. Even when the detection member is a coil spring or a bamboo spring, the detection member can protrude greatly from the bearing end, making it easier to visually recognize the abnormal temperature.

[Brief description of the drawings]

FIGS. 1A and 1B are partial cross-sectional views showing a rolling bearing according to an embodiment of the present invention in a normal state and an abnormal temperature rise state, respectively.

FIG. 2 is a partial side view of the bearing.

FIG. 3A is a partial cross-sectional view of a rolling bearing according to another embodiment of the present invention, and FIG. 3B is a side view showing a state of the rolling bearing at an abnormal temperature rise.

FIGS. 4A and 4B are partial cross-sectional views showing a normal state and an abnormal temperature rise state of a rolling bearing according to still another embodiment of the present invention, respectively.

FIGS. 5A and 5B are partial cross-sectional views showing a normal state and an abnormal temperature rise state of a rolling bearing according to still another embodiment of the present invention, respectively.

FIGS. 6A and 6B are partial cross-sectional views showing a rolling bearing according to still another embodiment of the present invention in a normal state and an abnormal temperature rise state, respectively.

FIG. 7 is a partial side view of the bearing.

FIG. 8A is a partial cross-sectional view of a rolling bearing according to still another embodiment of the present invention, and FIG. 8B is a side view showing a state at the time of abnormal temperature rise.

FIGS. 9A and 9B are partial cross-sectional views showing states of a rolling bearing according to still another embodiment of the present invention at a normal time and at an abnormal temperature rise, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inner ring 2 ... Outer ring 3 ... Rolling element 6 ... Detection member 6A ... Detection member 6B ... Detection member 6C ... Detection member 8 ... Restriction member 9 ... Spring member 9C ... Spring member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoaki Terada 1578 Higashikaizuka, Iwata City, Shizuoka Prefecture, Japan (72) Inventor Kazuhiko Ueda 1578 Higashikaizuka, Iwata City, Shizuoka Prefecture, Japan (72) Inventor Hiroyuki Kodama 1578 Higashikaizuka, Iwata-shi, Shizuoka Prefecture (72) Inventor Shinya Ooka 1578 Higashikaizuka, Iwata-shi, Shizuoka Prefecture Nutani-nu Corporation (72) Inventor Shinji Yoshino 1578, Higashikaizuka, Iwata-shi, Shizuoka Prefecture Within the Company (72) Inventor Naoki Shibamoto 1578 Higashikaizuka, Iwata City, Shizuoka Prefecture Inside (72) Inventor Mitsuhiro Morihiro 1578 Higashikaizuka, Iwata City, Shizuoka Prefecture F Term (in reference) 3J101 AA12 AA32 AA42 AA52 AA62 BA56 BA80 FA22

Claims (6)

[Claims] 1. A detecting member which is mounted on an end of a rolling bearing and fits in an annular space between an inner ring and an outer ring is provided. The detecting member is made of a shape memory alloy, and the internal temperature of the bearing has risen to a predetermined temperature or higher. A rolling bearing with an abnormal temperature detection function that sometimes deforms and protrudes from the bearing end. 2. A detecting member, comprising: a regulating member made of a shape memory alloy; and a spring which is disposed in an annular space between the inner and outer rings in a biasing state so as to protrude out of the bearing and whose projection is regulated by the regulating member. A rolling bearing having an abnormal temperature detection function, wherein the regulating member is deformed when the internal temperature of the bearing rises to a predetermined temperature or higher to release the regulation of the projection of the spring member. 3. The shield member according to claim 1, wherein the detection member is a circular disk-shaped shield plate mounted on an inner diameter portion of an end portion of the outer ring and having a predetermined annular gap formed between the detection member and an outer diameter surface of the inner ring. The rolling bearing with an abnormal temperature detection function according to 1. 4. The rolling bearing with an abnormal temperature detection function according to claim 2, wherein the spring member is a coil spring which is housed by being urged in the axial direction. 5. The rolling bearing with an abnormal temperature detecting function according to claim 2, wherein the spring member is a bamboo shoot spring housed by being biased in the axial direction. 6. The sensor according to claim 1, wherein the detecting member is a spring member in the form of a coil spring or a bamboo spring, and extends in the axial direction when the internal temperature of the bearing rises to a predetermined temperature or higher. Rolling bearing with abnormal temperature detection function.