JP2001289867A - Rotation support device with rotation speed detector - Google Patents

Abstract

(57) [Problem] To reduce the size and weight and to eliminate the need for adjusting the gap in the diameter direction between the detection unit of the sensor 34a and the detection target unit of the encoder 24. A sensor mounting hole (33a) is formed in a bottom plate (30) of a cover (28a) so as to extend axially through both side surfaces of the bottom plate (30).
Is provided. The sensor 34a is connected to the sensor mounting hole 33a.
Insert and support inside. In this state, the sensor 34a
The flat surface 44, which is a detecting portion provided on the side surface of the distal end portion, is diametrically opposed to the detected portion of the encoder 24 provided on the outer peripheral surface of the holding plate member 15a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a rotation supporting device with a rotation speed detecting device, for example, which rotatably supports a wheel of a railway vehicle with respect to a housing which does not rotate even when used, and a rotation speed of the wheel. Used to detect.

[0002]

2. Description of the Related Art A rolling bearing unit is used to rotatably support a wheel of a railway vehicle with respect to a housing fixed to the railway vehicle. On the other hand, in order to determine the running speed of a railway vehicle or to perform sliding control for preventing uneven wear of the wheels, it is necessary to detect the rotational speed of the wheels. For this reason, the wheel is rotatably supported with respect to the housing by a rotation support device with a rotation speed detection device incorporating a rotation speed detection device in the rolling bearing unit, and the rotation speed of the wheel can be detected. ,
In recent years it has been done.

FIG. 8 and FIG. 9 show a first example of a conventional structure of a rotation support device with a rotation speed detection device for such a railway vehicle. An axle 1, which is a rotating shaft that rotates during use with a wheel (not shown) supported and fixed, is rotatable by a double-row tapered roller bearing 3 on the inner diameter side of a cylindrical bearing box 2, which is a housing that does not rotate during use. I support it. The double-row tapered roller bearing 3 includes an outer ring 4 and a pair of inner rings 5, 5 arranged concentrically with each other, and a plurality of tapered rollers 6, 6. The outer ring 4 is formed in a cylindrical shape as a whole, and has a plurality of rows of outer ring raceways 7 on its inner peripheral surface. Each of these outer raceways 7, 7 has a conical concave shape, and is inclined in such a direction that the inner diameter increases toward the axial end of the outer race 4.

The pair of inner rings 5, 5 are each formed in a substantially short cylindrical shape, and conical convex inner ring tracks 8, 8 are formed on the respective outer peripheral surfaces. Each of the inner rings 5, 5 is disposed concentrically with the outer ring 4 on the inner diameter side of the outer ring 4 with the end faces on the smaller diameter side facing each other. Further, each of the tapered rollers 6, 6 can be rolled freely between the outer raceways 7, 7 and the inner raceways 8, 8 while being held by a plurality of retainers 9, 9, respectively. Provided.

[0005] Of the double row tapered roller bearing 3 as described above,
The outer race 4 is internally fixed to the inner peripheral surface of the bearing housing 2 by gap fitting. In the illustrated example, a stepped portion 10 is formed near one end (the left end in FIG. 8) of the inner peripheral surface of the bearing housing 2.
The outer ring 4 is sandwiched from both sides in the axial direction between the bearing ring 2 and a holding ring 11 which is fitted and fixed to the other end of the bearing housing 2 (the right end in FIG. 8). However, there is a slight gap between the side surfaces of the step portion 10 and the holding ring 11 and both side surfaces of the outer ring 4. On the other hand, each of the inner rings 5, 5 is
While the spacer 12 is sandwiched between the five, the axle 1 is externally fitted and fixed to a portion near one end (the left end in FIG. 8) of the axle 1. or,
A pair of annular members 13a and 13b, each called an oil drain, are disposed on both axial sides of the inner rings 5, 5. And, these two inner rings 5, 5 and the annular member 13
a, 13b and the spacer 12 are formed by a stepped portion 14 formed near the other end (right end in FIG. 8) of the outer peripheral surface of the axle 1 and a holding plate member 15 fixedly connected to one end surface of the axle 1. It is clamped and fixed between.

On both ends of the outer race 4, seal cases 16, 16 each formed by forming a metal plate such as a mild steel plate into a substantially cylindrical shape with a crank-shaped cross section are fixedly fitted. And, between the inner peripheral surface of both of these seal cases 16, 16 and the outer peripheral surface of each of the annular members 13a, 13b,
By providing the sealing members 17, 17, the openings at both ends of the space in which the plurality of tapered rollers 6, 6 are installed are closed. With this configuration, it is possible to prevent the lubricating grease sealed in the space from leaking to the outside and to prevent foreign matters such as rainwater and dust from entering the space from the outside.

The pressing plate member 15 fixedly connected to one end surface of the axle 1 is formed in a substantially cylindrical shape having a bottom with a magnetic metal material such as steel. Such a holding plate member 15
Is a disk-shaped holding plate main body 19 and a short cylindrical fitting cylindrical portion protruding to one side in the axial direction over the entire circumference from a portion near the outer periphery of one side surface (the right side surface in FIG. 8) of the holding plate main body 19. 20 and the fitting cylindrical portion 20 protruding from the outer peripheral edge portion of the other side surface (the left side surface in FIG. 8) of the holding plate body 19 to the other side in the axial direction over the entire circumference.
A cylindrical portion 21 having a larger axial dimension. Then, the tip of the cylindrical portion 21 (the left end in FIG. 8)
By forming the concave portions 22, 22 and the convex portions 23, 23 alternately and at equal intervals in the circumferential direction on the outer peripheral surface, the magnetic characteristics of the portion are alternately and equally spaced at equal intervals in the circumferential direction. By changing it, the portion functions as the encoder 24.

When the holding plate member 15 as described above is fixedly connected to one end surface of the axle 1, the tip side (right end side in FIG. 8) of the fitting cylinder 20 is connected to one end of the axle 1. A plurality of bolts 26, 26 inserted into the insertion holes 25 formed in the holding plate main body 19 are screwed into screw holes 27 formed in one end surface of the axle 1, respectively, while being fitted to the outside, and further tightened. I do. In this state, the distal end surface of the fitting cylindrical portion 20 suppresses one axial end surface of one (left side in FIG. 8) annular member 13a. With the holding plate member 15 fixedly connected to one end surface of the axle 1 in this manner, the distal end of the cylindrical portion 21 provided with the encoder 24 is more axially outward than one end edge of the bearing housing 2. (Left side in FIG. 8).

The one end opening of the bearing housing 2 is closed by a cover 28 fixed to one end of the bearing housing 2.
The cover 28 is formed entirely of a synthetic resin or a metal material into a cylindrical shape with a bottom, and has a cylindrical portion 29 and a bottom plate portion 30 that closes an opening of one end (the left end in FIG. 8) of the cylindrical portion 29.
And an outward flange-shaped mounting portion 31 provided on the outer peripheral surface of the cylindrical portion 29 near the other end (the right end in FIG. 8). When fixing such a cover 28 to one end of the bearing box 2, the other end of the cylindrical portion 29 is fitted inside one end of the bearing box 2, and the mounting portion 31 is attached to the bearing box 2. 2 against one end face. Then, in this state, the mounting portion 31
With respect to one end face of the bearing housing 2, a plurality of bolts 32,
Fix by 32.

A cylindrical portion 29 forming the cover 28
A sensor mounting hole 33 diametrically penetrating through the inner and outer peripheral surfaces of the cylindrical portion 29 at a portion diametrically opposed to the encoder 24. Then, the tip of the sensor 34 (the lower end in FIG. 8 and the right end in FIG. 9) is inserted into the inside of the cover 28 through the sensor mounting hole 33, and the detecting portion provided on the tip surface of the sensor 34 The detection target is provided on the outer peripheral surface of the encoder 24 via a minute gap 18. In the case of the illustrated example, the sensor mounting hole 33 is a screw hole in which a screw groove is formed on the inner peripheral surface. On the other hand, a portion of the sensor 34 that is inserted into the sensor mounting hole 33 is a male screw portion 35 that can be screwed into the sensor mounting hole 33. Such a sensor 3
Reference numeral 4 denotes a well-known structure in which a permanent magnet (not shown) and a sensor element 36 as a detection element are embedded and supported inside the male screw portion 35, and the sensor element 36 is connected to the distal end of the male screw portion 35 (see FIG. Lower end of FIG. 8, FIG. 9
(Right end) of the male screw portion 35 so as to serve as the detection portion.

When the above-described sensor 34 is supported in the sensor mounting hole 33, the male screw portion 35 is screwed into the sensor mounting hole 33, and the distal end of the male screw portion 35 is attached to the cover 28. Let go inside. The detector provided on the tip end surface of the male screw portion 35 and the encoder 2
4 (the above-mentioned minute gap 1)
The thickness of the male screw portion 35 (the amount of penetration) is adjusted so that the thickness of the male screw portion 8 becomes a predetermined size. Then, if the screwing amount of the male screw portion 35 is adjusted,
A nut 52 screwed to a portion of the male screw portion 35 projecting outward in the diametric direction from the sensor mounting hole 33 is tightened to achieve positioning.

The base end of the sensor 34 as described above (FIG. 8)
(The upper end of FIG. 9, the left end of FIG. 9), a harness 37 for extracting a detection signal of the sensor 34 is derived. In the case of the illustrated example, a support plate 38 is fixed to a part of the cover 28 in order to prevent the intermediate portion of the harness 37 from swinging around, and the harness 37 is fixed to a part of the support plate 38. (A portion near the sensor 34). Specifically, a portion near the base end of the harness 37 is held down on a part of the support plate 38 by a holding member 39 screwed and fixed to the support plate 38.

[0013] In the case of the rotation support device with the rotation speed detecting device constructed as described above, the axle 1 supporting and fixing the wheels during operation.
When the encoder 24 rotates together with the
4, the concave portions 22 and 22 and the convex portions 23 and 2 that constitute the detected part.
3 alternately pass near the detection unit provided on the tip end surface of the sensor 34. As a result, the density of the magnetic flux flowing in the sensor changes, and the output of the sensor changes.
The frequency at which the output of the sensor 34 changes in this way is proportional to the rotation speed of the wheel. Therefore, the sensor 34
Is sent to a controller (not shown) by a harness 37 derived from the sensor 34, the rotation speed of the wheels can be detected, and the sliding control of the railway vehicle can be appropriately performed.

On the other hand, as a second example of the conventional structure of the rotation supporting device with the rotation speed detecting device as described above, Japanese Utility Model Laid-Open Publication No.
No. 66 describes a structure in which a sensor constituting a rotational speed detecting device together with an encoder is supported and fixed to a part of an outer ring which is internally fitted and supported inside a bearing housing.

[0015]

In the case of the first example of the conventional structure shown in FIGS. 8 and 9, a sensor mounting hole 33 for supporting the sensor 34 is provided in the cylindrical portion 29 forming the cover 28. Is provided in a part of. Therefore, at least the provision of the sensor mounting hole 33 increases the axial dimension of the cylindrical portion 29. Further, in the case of the first example of the conventional structure, a detecting portion provided on the distal end surface of the sensor 34 is inserted into the cover 28 in the diameter direction through the sensor mounting hole 33. For this reason, the above-mentioned detection part is arranged at a portion which is separated in the axial direction from one end face of the axle 1 to which the holding plate member 15 is connected and fixed. Along with this, the holding plate member 1 is provided so that the detected portion of the encoder 24 provided on the outer peripheral surface of the holding plate member 15 is diametrically opposed to the detection portion of the sensor 34.
It is necessary to increase the axial dimension of No. 5 (providing an extended portion such as the cylindrical portion 21). Therefore, the provision of the extension such as the cylindrical portion 21 increases the axial dimension of the holding plate member 15. Then, as described above, the cover 28 and the holding plate 1
As a result, the size of the rotation supporting device with the rotation speed detecting device is increased in size and weight, and the manufacturing cost is increased.

In the case of the first example of the above-mentioned conventional structure, in order to prevent the intermediate portion of the harness 37 derived from the base end of the sensor 34 from swinging around, a portion near the base end of the harness 37 is used. To a support plate 38 fixed to the cover 28.
Part of it. However, providing a separate member such as the support plate 38 is not preferable because not only the number of parts is increased and the manufacturing cost is increased, but also the whole is increased in size and weight. In the case of the first example of the conventional structure, the reason for providing the separate member such as the support plate 38 is that the harness 37 is led outward in the diametrical direction of the cover 28. This is because there is no suitable fixing member for suppressing the base portion of the harness 37 near the base portion of the harness 37.

Further, in the case of the first example of the above-mentioned conventional structure, when the sensor 34 is assembled in the sensor mounting hole 33, the screwing amount (entering amount) of the sensor 34 into the sensor mounting hole 33 is adjusted. By doing so, it is necessary to adjust the distance (dimension of the minute gap 18) between the detecting portion provided on the distal end surface of the sensor 34 and the detected portion provided on the outer peripheral surface of the encoder 24 to an appropriate size. . For this reason, the work of assembling the sensor becomes troublesome to the extent that such adjustment work is required. The reason why it is necessary to adjust the screw-in amount of the sensor 34 as described above in order to make the distance between the detection section and the detected section appropriate is that the railway vehicle shown in FIGS. In the case of the rotation support device with the rotation speed detecting device for the vehicle, the outer ring 4 is compared with the rotation support device with the rotation speed detection device for the automobile.
This is because the outside diameter is too large at 140 mm or more, so that the tolerance becomes too large in normal tolerance management. Further, the outer ring 4 and the bearing housing 2 cannot be integrated with each other as in the case of the rotation support device with a rotation speed detecting device for an automobile.

On the other hand, in the case of the second example of the conventional structure described in Japanese Utility Model Application Laid-Open No. 5-77766, the sensor is supported by a part of the outer ring, so that the outer ring is fitted to the bearing box. When creep (relative rotation) occurs on the surface, an error occurs in the detected value of the rotation speed. Therefore, in order to ensure the reliability of the rotation speed detection, as in the first example of the conventional structure shown in FIGS. It is preferable to adopt a structure in which the cover is supported by a part of the cover fixed to the bearing housing. The rotation support device with a rotation speed detection device of the present invention has been invented in view of the above-described circumstances.

[0019]

A rotation supporting device with a rotation speed detecting device according to the present invention has a housing which does not rotate during use, similarly to the first example of the conventional structure shown in FIGS.
A rotating shaft arranged on the inner diameter side of the housing and rotating at the time of use, and an inner ring is externally supported on the outer peripheral surface of the rotating shaft so as to rotatably support the rotating shaft on the inner diameter side of the housing. A rolling bearing in which the outer ring is fitted and supported on the inner peripheral surface of the housing, and a portion projecting diametrically outward from the outer peripheral surface of one end of the rotary shaft in a state of being fixedly connected to one end surface of the rotary shaft. A holding plate member for holding the inner ring directly or via another member to a step provided on the outer peripheral surface of the intermediate portion of the rotary shaft, and fixed to one end of the housing in a state of closing one opening of the housing. A cover, an encoder provided directly or via another member on the outer peripheral surface of the holding plate member, and a sensor mounting hole provided in a part of the cover inside a sensor mounting hole in an axial direction of the sensor mounting hole. I State, and a sensor are opposed to the detected part of the detection unit and the encoder. In particular,
In the rotation support device with the rotation speed detection device of the present invention,
The sensor mounting hole is provided in a part of the bottom plate part of the cover so as to penetrate both side surfaces of the bottom plate part in the axial direction. Also, the sensor has a tip portion inserted in the axial direction of the rotary shaft through the sensor mounting hole inside the cover, and a detecting portion provided at the tip portion is diametrically attached to a detected portion of the encoder. Facing.

Preferably, a detecting portion of the sensor (a portion of the sensor diametrically opposed to a detected portion of the encoder) exists in a direction orthogonal to the diametric direction of the encoder. It is a plane. Further, when the detection unit of the sensor is a flat surface as described above,
An engaging portion is provided between the sensor and the cover, the engaging portion being engaged so that the plane is orthogonal to the diametric direction of the encoder.

[0021]

As described above, in the case of the rotation support device with the rotation speed detection device of the present invention, the sensor mounting hole is provided in the bottom plate of the cover. Therefore, the axial dimension of the cover does not increase with the provision of the sensor mounting hole.
Also, the tip of the sensor is inserted axially through the sensor mounting hole inside the cover. Therefore, the detection unit of the sensor can be disposed at a portion near one end surface of the rotating shaft to which the holding plate member is connected and fixed in the axial direction. Therefore, it is not necessary to increase the axial dimension of the holding plate member so that the detected portion of the encoder provided on the outer peripheral surface of the holding plate member is diametrically opposed to the detecting portion of the sensor. As a result, the axial dimension of the pressing plate member and the cover is reduced,
The size and weight of the rotation support device with the rotation speed detection device can be reduced, and the manufacturing cost can be reduced.

In the case of the present invention, the sensor is supported and fixed to the bottom plate of the cover by bolts or the like. For this reason, if a harness for extracting the detection signal of this sensor is derived from the base end of the sensor in a direction parallel or nearly parallel to the outer surface of the bottom plate portion, the base end portion of the harness can be shifted to the bottom plate. It can be fixed to the outer surface of the part. Therefore, there is no need to provide a separate member such as the above-described support plate 38 (see FIG. 9) in order to fix the base end portion of the harness. For this reason, this separate member can be omitted,
The number of parts can be reduced, the manufacturing cost can be reduced, and the size and weight can be reduced.

Further, in the case of the present invention, the detecting portion provided at the distal end portion of the sensor is diametrically inserted with the detected portion of the encoder while being inserted axially through the sensor mounting hole inside the cover. opposite. For this reason, in order to regulate the distance in the diametric direction between the detection unit of these sensors and the detection target unit of the encoder to an appropriate size, it is said that the insertion amount of the sensor into the sensor mounting hole is finely adjusted.
There is no need to do any troublesome work. That is, in the case of the present invention, if the formation position of the sensor mounting hole and the dimensional accuracy of the constituent members are managed, the detection unit and the sensor are inserted and supported in the sensor mounting hole. The distance in the diametric direction from the detected part can be set to a predetermined size.

Further, in the case of the present invention, the detecting portion of the sensor (a part of the sensor diametrically opposed to the detected portion of the encoder) is oriented in a direction orthogonal to the diametric direction of the encoder. If the plane exists, the distance between the detection section and the detected section in the diameter direction can be further increased, and the dimensional accuracy of each component can be roughened.
When the detecting portion of the sensor is a flat surface as described above, an engaging portion is provided between the sensor and the cover so that the flat surface is orthogonal to the diametric direction of the encoder. Then, the assembling work of the sensor can be easily and appropriately performed.

In the case of the present invention, as in the case of the first example of the conventional structure shown in FIGS. 8 and 9, the sensor is supported by a part of a cover fixed to a bearing box. Because of this,
Even when the outer ring which is internally fitted and supported inside the bearing box is creeped, no error occurs in the detected value of the rotational speed by the sensor, and the reliability of the rotational speed detection can be ensured.
In addition, the creep of the outer ring does not cause the inconvenience that the outer ring and the sensor rotate together and the harness derived from the sensor is cut.

[0026]

1 to 3 show a first embodiment of the present invention. The feature of the present invention lies in the structure of the rotation speed detecting device portion including the encoder 24 and the sensor 34a. These encoder 24 and sensor 34
a, including the effect of detecting the rotation speed of the wheel by a
Since the structure and operation of the other parts are the same as those of the first example of the conventional structure shown in FIGS. 8 and 9 above, the same parts are denoted by the same reference numerals, and the description of the overlapping parts is omitted. Or, for simplicity, the following mainly describes the features of the present invention.

In the case of this embodiment, the holding plate member 15a fixedly connected to one end surface of the axle 1 has an outer diameter side portion on the other side surface (left side surface in FIG. 1) of the holding plate body 19 constituting the holding plate member 15a. Cylindrical portion 21 protruding in the axial direction (left-right direction in FIG. 1)
(See FIG. 8). Accordingly, in the case of this example, the encoder 24 is provided on the outer peripheral surface of the holding plate main body 19. That is, by forming the concave portions 22 and 22 and the convex portions 23 and 23 alternately and at equal intervals in the circumferential direction on the outer peripheral surface of the holding plate main body 19, the magnetic characteristics of the portion are changed in the circumferential direction. Are changed alternately and at equal intervals. In the case of the present example, the encoder 24 is located at one end (the left end in FIG. 1) of the bearing housing 2 on the inner diameter side.

In the case of this embodiment, a sensor mounting hole 33a for supporting and fixing the sensor 34a to the cover 28a fixed to one end of the bearing housing 2 is provided.
The bottom plate 30 is provided at a portion closer to the outer diameter. In the case of this example, this sensor mounting hole 33a is
Are provided so as to penetrate in the axial direction, and the inner peripheral surface is merely a cylindrical surface. Also, the sensor 34a
Is a cylindrical insertion portion 40 in which a permanent magnet (not shown) and a sensor element 36 as a detection element are embedded and supported, and is fixed to a base end portion (left end portion in FIG. 1) of the insertion portion 40. And a rectangular mounting portion 41. The insertion section 40
Is designed such that its base end portion can be freely inserted and supported in the sensor mounting hole 33a without rattling. In the illustrated example, the locking groove 42 is formed over the entire circumference on the outer peripheral surface of the insertion portion 40 near the base end.
And an O-ring 43 is locked in the locking groove 42. With the base end of the insertion portion 40 being inserted into the sensor mounting hole 33a, the portion between the outer peripheral surface of the insertion portion 40 and the inner peripheral surface of the sensor mounting hole 33a is connected to the O-ring 43. Sealed by This allows the cover 28 to pass through the sensor mounting hole 33a.
A foreign substance such as rainwater is prevented from entering the inside of the cover 28a, and a lubricant such as grease is prevented from leaking outside the cover 28a.

The portion of the outer peripheral surface of the distal end portion (right end portion in FIG. 1) of the insertion portion 40 which faces the detected portion provided on the outer peripheral surface of the encoder 24 is, as shown in FIG. The flat part 44 is shaped like a part of the part 40 cut away. In the case of the present example, the sensor element 36 embedded in the insertion portion 40 is disposed in the vicinity of the flat portion 44, and the flat portion 44 is used as a detection portion of the sensor 34a. When assembling the sensor 34a into the sensor mounting hole 33a, the flat portion 44 is disposed on a virtual plane perpendicular to the diameter direction of the encoder 24 with respect to the detected portion of the encoder 24.

Further, a part of the mounting portion 41 is
A pair of insertion holes 45, 45 are provided on both sides of the mounting portion 41 so as to communicate with both sides of the mounting portion 41.
A part of the inner surface (the right side surface in FIG. 1 and the back side surface in FIG. 2) of the mounting portion 41 and a portion deviated from the insertion portion 40 and each of the insertion holes 45 is provided with the insertion portion from the inner surface. A positioning pin 46 protruding in parallel with 40 is provided. On the other hand, a part of the outer side surface (the left side surface in FIG. 1 and the front side surface in FIG. 2) of the bottom plate portion 30 constituting the cover 28a and a portion facing the inner side surface of the mounting portion 41 is provided with the positioning pin 46. A receiving hole 47 that can be engaged without rattling is provided. In the case of this example, the positioning of the insertion portion 40 in the circumferential direction is achieved based on the engagement between the positioning pins 46 and the receiving holes 47. That is, the insertion portion 40 is connected to the sensor mounting hole 3.
3a, and by engaging the positioning pin 46 with the receiving hole 47, the flat surface portion 44 (detection portion) provided on the outer peripheral surface of the distal end portion of the insertion portion 40 becomes the outer peripheral surface (covered) of the encoder 24. The flat portion 4
4 is positioned so as to be disposed on a virtual plane orthogonal to the diameter direction of the encoder 24.

When the sensor 34a as described above is supported and fixed in the sensor mounting hole 33a, the insertion portion 40 is inserted into the sensor mounting hole 33a from outside the cover 28a. Then, with the positioning pins 46 engaged with the receiving holes 47, the inner surface of the mounting portion 41 is brought into contact with the outer surface of the bottom plate portion 30 constituting the cover 28a. Then, screws (not shown) inserted into the pair of insertion holes 45 provided in the mounting portion 41 are screwed into screw holes provided on the outer surface of the bottom plate portion 30, respectively, and further tightened. In this state, the flat portion 44, which is the detecting portion of the sensor 34a, and the detected portion provided on the outer peripheral surface of the encoder 24 face each other via the minute gap 18 in the diameter direction. That is, in this state, the detection unit of the sensor 34a
One end of the bearing housing 2 is disposed on the inner diameter side portion.

In the case of this embodiment, the harness 37 for extracting the detection signal from the sensor 34a is connected to the mounting portion 4
1 from the side of the bottom plate 30 toward the opposite side of the sensor mounting hole 33a in the diametrical direction of the bottom plate 30.
Are drawn out in parallel with the outer surface of. Then, two positions of the middle portion of the harness 37 near the sensor 34a are pressed against the outer surface of the bottom plate 30 by holding metal fittings 39, 39 screwed and fixed to the outer surface of the bottom plate 30 respectively. ing. This prevents the intermediate portion of the harness 37 from swinging around.

As described above, in the case of the rotation supporting device with the rotation speed detecting device of this embodiment, the sensor mounting hole 33a for supporting the sensor 34a is provided with the bottom plate portion 30 forming the cover 28a.
Is provided. For this reason, the axial dimension of the cylindrical portion 29 can be reduced as compared with a structure in which the sensor mounting hole is provided in the cylindrical portion 29 forming the cover 28a. In the case of this example,
A flat portion 44, which is a detection portion, provided on the side surface of the distal end portion of the sensor 34a is inserted into the cover 28a in the axial direction through the sensor mounting hole 33a. Therefore,
The flat portion 44, which is the detection portion, can be disposed at a portion near one end surface of the axle 1 to which the holding plate member 15a is connected and fixed in the axial direction. For this reason, the detected portion of the encoder 24 provided on the outer peripheral surface of the pressing plate member 15a is
Therefore, it is not necessary to increase the axial dimension of the pressing plate member 15a in order to oppose each other in the diameter direction. As described above, in the case of this example, the flat portion 44 is connected to the holding plate member 15.
The encoder 24 is provided on the outer peripheral surface of the holding plate main body 19 while being disposed on the outer diameter side portion of the holding plate main body 19 that constitutes a. An extension such as the cylindrical portion 21 (see FIG. 8) is not provided in a part of the holding plate member 15a, thereby reducing the axial dimension of the holding plate member 15a. Thus, in the case of this example, the axial dimension of the cover 28a and the pressing plate member 15a can be reduced,
The size and weight of the rotation support device with the rotation speed detection device can be reduced, and the manufacturing cost can be reduced.

In the case of this embodiment, a portion near the base end of the harness 37 derived from the mounting portion 41 provided at the base end of the sensor 34a is fixed to the outer surface of the bottom plate portion 30 constituting the cover 28a. ing. Therefore, it is not necessary to provide a separate member such as the support plate 38 (see FIG. 9) for fixing the base portion of the harness 37 near the base end. For this reason, since the separate member can be omitted, the number of parts can be reduced, the manufacturing cost can be reduced, and the size and weight can be reduced.

In the case of the present embodiment, the flat portion 44, which is a detecting portion provided on the side surface of the distal end portion of the sensor 34a, is inserted in the axial direction through the sensor mounting hole 33a inside the cover 28a. The portion to be detected of the encoder 24 is diametrically opposed. Therefore, in the case of the present example, in order to regulate the diametrical interval between the detecting portion of the sensor 34a and the detected portion of the encoder 24 to an appropriate size, as in the conventional structure described above, the sensor mounting hole 33a is used. To finely adjust the insertion amount of the sensor 34a with respect to
There is no need to do any troublesome work. That is, in the case of this example, the position of the sensor mounting hole 33a and the dimensional accuracy of each component are regulated in advance, so that the sensor 34
a is inserted into and supported by the sensor mounting hole 33a.
The distance between the detecting section and the detected section in the diameter direction can be set to a predetermined size.

In the case of the present embodiment, the detecting portion of the sensor 34a (a part of the sensor 34a diametrically opposed to the detected portion of the encoder 24) is positioned with respect to the diametric direction of the encoder 24. The plane portion 44 exists in a direction orthogonal to the direction. For this reason, in the case of this example, the flat portion 44 serving as a detecting portion and the encoder 2 serving as a detected portion are used.
Even if the distance in the diametrical direction from the outer peripheral surface of the fourth member 4 increases, the rotation speed can be detected, and the accuracy of each component can be reduced. That is, by providing the flat portion 44, the depth of the sensor element 36 embedded and supported in the detecting portion from the surface of the flat portion 44 can be made small (shallow). For this reason, the sensor element 36 and the encoder 24
When the distance from the outer peripheral surface of the encoder 24 is the same, the diametrical interval between the flat surface portion 44 and the outer peripheral surface of the encoder 24 can be increased.

Further, in the case of this embodiment, the sensor 34a
Cover 2 fixed to a bearing housing 2 which does not rotate during use.
8a. Therefore, even when the outer race 4 internally fitted and supported inside the bearing housing 2 is creeped, no error occurs in the rotational speed detected by the sensor 34a. For this reason, the reliability of rotation speed detection can be ensured.
Further, since the sensor 34a does not rotate due to the creep of the outer race 4, the harness 37 attached to the sensor 34a is not cut.

In the case of the present invention shown in the first example, the detecting portion of the sensor 34a and the detected portion of the encoder 24 are diametrically opposed. On the other hand, as shown in FIG. 4, a detecting portion provided on the distal end surface (right end surface in FIG. 4) of the sensor 34c and a circular ring which is a detected portion of the encoder 24c externally fixed to the holding plate member 15a. It is also conceivable to adopt a structure in which the portion 48 is opposed in the axial direction. However, if a structure as shown in FIG. 4 is adopted, the axial gap existing between the bearing housing 2 and the outer ring 4 causes
The encoder 2 supported on the holding plate member 15a during operation
When 4c moves in the axial direction, the axial distance between the detection section of the sensor 34c and the detected section of the encoder 24c changes. For this reason, it is not possible to set a small axial distance between the detecting unit and the detected unit, and it is difficult to improve the accuracy of the rotation speed detection, or the rotation speed detection may not be performed. is there. On the other hand, in the case of the present invention, the detecting portion of the sensor 34a and the detected portion of the encoder 24 are diametrically opposed. For this reason, even when the encoder 24 provided on the outer peripheral surface of the pressing plate member 15a moves in the axial direction during operation, the distance between the detecting portion of the sensor 34a and the detected portion of the encoder 24 does not change. . Therefore, it is possible to set a small interval between the detection unit and the detection target, and it is possible to prevent the rotation speed from being unable to be detected, and to improve the accuracy of the rotation speed detection. In the case of the first example described above, a magnetic sensor using a Hall element, a magnetoresistive element, or the like was employed as the sensor 34a. However, the same effect can be obtained even when an electromagnetic sensor (passive sensor) that detects a change in magnetic flux density by a coil is used as this sensor.

FIG. 5 shows a second embodiment of the present invention.
An example is shown. In the case of this example, the encoder 24a constituting the rotation speed detecting device together with the sensor 34a is not provided directly on the outer peripheral surface of the holding plate body 19 which constitutes the holding plate member 15a, but is externally fitted and fixed to the outer peripheral surface of the holding plate body 19. Used separately. In the case of this example, this encoder 24a
Is formed in a cylindrical shape entirely by a magnetic metal plate such as a mild steel plate. A large number of through holes 49 are formed at an axially intermediate portion at equal intervals in a circumferential direction. As a result, the magnetic characteristics of the intermediate portion in the axial direction of the encoder 24a are alternately changed at regular intervals in the circumferential direction, and the portion is set as a detected portion. Other configurations and operations are the same as those of the above-described first example.

FIG. 6 shows a third embodiment of the present invention.
An example is shown. Also in the case of this example, the encoder 24b constituting the rotation speed detecting device together with the sensor 34b is not directly provided on the outer peripheral surface of the holding plate body 19 which constitutes the holding plate member 15a, but is externally fitted to the outer peripheral surface of this holding plate body 19. A separate and fixed one is used. In the case of this example, this encoder 24
b is composed of a core metal 50 formed in a cylindrical shape from a magnetic metal plate such as a mild steel plate, and a cylindrical permanent magnet 51 fixed to the outer peripheral surface of the core metal 50 by baking, molding, bonding or the like. Of these, the permanent magnet 51 is made of a rubber magnet obtained by mixing a powder of a ferromagnetic material such as ferrite into rubber, and is magnetized in the diameter direction (radiation direction). The magnetization directions are changed alternately and at equal intervals in the circumferential direction. That is,
On the outer peripheral surface of the permanent magnet 51, S poles and N poles are arranged alternately and at equal intervals in the circumferential direction. When assembling the encoder 24b configured as described above,
The core 50 is externally fitted and fixed to the holding plate body 19 by interference fitting. In the case of this example, the provision of the permanent magnet 51 on the encoder 24a side causes the sensor 34b
A known structure having only a magnetism detecting element and no permanent magnet is used. Other configurations and operations are
This is the same as the case of the first example described above.

FIG. 7 shows a fourth embodiment of the present invention.
An example is shown. In the case of this example, of the pair of seal members 17 that close the openings at both ends of the space provided with the plurality of tapered rollers 6, the seal member 17 (shown in FIG. 7) on the sensor 34a side.
A member called an oil drain (a member corresponding to the above-described first to third examples of the annular member 13a) provided on the inner diameter side is integrally formed with the pressing plate member 15b. Other configurations and operations are the same as in the case of the above-described first example.

[0042]

As described above, the rotation supporting device with the rotation speed detecting device according to the present invention is constructed and operated as described above, so that the manufacturing cost can be reduced while reducing the size and weight. In addition, the distance between the detecting section of the sensor and the detected section of the encoder can be set to an appropriate size, and it is not necessary to adjust the distance when assembling the sensor. For this reason, the reliability of rotation speed detection can be ensured, and the cost can be reduced due to the improvement of work efficiency.

[Brief description of the drawings]

FIG. 1A shows a first example of an embodiment of the present invention,
-OA sectional drawing.

FIG. 2 is a view as seen from the left side of FIG. 1;

FIG. 3 is an enlarged view B- of FIG.
B sectional drawing.

FIG. 4 is a sectional view of a main part showing an example of an undesired structure.

FIG. 5 is an essential part cross-sectional view showing a second example of the embodiment of the present invention.

FIG. 6 is an essential part cross-sectional view showing the third example.

FIG. 7 is an essential part cross-sectional view showing the fourth example.

FIG. 8 is a sectional view taken along the line C-C-C of FIG. 9, showing an example of a conventional structure.

FIG. 9 is a view as seen from the left side of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Axle 2 Bearing box 3 Double row tapered roller bearing 4 Outer ring 5 Inner ring 6 Tapered roller 7 Outer ring raceway 8 Inner ring raceway 9 Cage 10 Step section 11 Suppression ring 12 Spacing 13a, 13b Ring member 14 Step section 15, 15a, 15b Plate member 16 Seal case 17 Seal member 18 Micro gap 19 Suppression plate main body 20 Fitting tube portion 21 Cylindrical portion 22 Depression 23 Convex portion 24, 24a, 24b, 24c Encoder 25 Insertion hole 26 Bolt 27 Screw hole 28, 28a Cover 29 cylinder Part 30 Bottom plate part 31 Mounting part 32 Bolt 33, 33a Sensor mounting hole 34, 34a, 34b, 34c Sensor 35 Male screw part 36 Sensor element 37 Harness 38 Support plate 39 Holder 40 Insertion part 41 Mounting part 42 Lock groove 43 O-ring 44 flat part 45 insertion hole 46 positioning pin 47 receiving hole 4 8 Circle part 49 Through hole 50 Core metal 51 Permanent magnet 52 Nut

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01D 5/245 G01D 5/245 X (72) Inventor Takehiko Kikawa 1-5-150 Kugenuma Jinmei, Fujisawa City, Kanagawa Prefecture No. N-Seiko Co., Ltd. F-term (reference) 2F077 AA43 CC02 NN04 NN19 NN24 PP06 VV02 VV03 3J101 AA16 AA32 AA43 AA54 AA62 FA23 FA44 FA53 GA03

Claims (1)

[Claims] 1. A housing that does not rotate during use, a rotating shaft that is disposed on the inner diameter side of the housing and rotates during use, and an inner ring that rotatably supports the rotating shaft on the inner diameter side of the housing. And a rolling bearing whose outer ring is internally fitted and supported on the inner peripheral surface of the housing, and one end of the rotating shaft which is fixedly connected to one end surface of the rotating shaft. A portion projecting radially outward from the outer peripheral surface, a pressing plate member for pressing the inner ring directly or via another member to a step provided on the outer peripheral surface of the intermediate portion of the rotating shaft; and one end of the housing A cover fixed to the housing so as to close one end opening of the housing, an encoder provided directly or via another member on the outer peripheral surface of the holding plate member, and a sensor mounting hole provided in a part of the cover. In a rotation support device with a rotation speed detection device, which has a sensor in which the detection portion and the detected portion of the encoder are opposed to each other while being inserted and supported in the axial direction of the sensor mounting hole, The sensor mounting hole is
A part of the bottom plate part constituting the cover is provided so as to penetrate both side surfaces of the bottom plate part in the axial direction, and the sensor has a tip end inside the cover through the sensor mounting hole and the rotation shaft. A rotation support device with a rotation speed detection device, wherein a detection portion provided at the distal end portion is diametrically opposed to a detected portion of the encoder when inserted in the axial direction.