JP2006207750A - Bearing with sensor and bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing with a sensor easy to assemble in a steel plate housing, and to provide a bearing device. <P>SOLUTION: The bearing with the sensor through which a rotating shaft is inserted and which is fitted into a plate portion 31 has the sensor for sensing rotation. It comprises a sensor housing 1 mounted on an outer ring 10b of the bearing 10 for housing the sensor 5. The sensor housing 1 has a positioning portion 8 for positioning the bearing 10 on the plate portion 31 and a rotation preventing portion 7 for preventing rotating deviation from the plate portion 31. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sensor-equipped bearing and a bearing device that can be easily incorporated into office machines such as copying machines and printers.

  A bearing with a rotation sensor having a sensor for detecting a rotation speed or the like is an indispensable machine element for office equipment such as a copying machine and a printer. A sensor housing containing a sensor element of a bearing with a rotation sensor is press-fitted into, for example, an inner diameter portion of an outer ring of the bearing (see Patent Document 1), and the entire bearing with a rotation sensor including this sensor housing is applied. Built into the device housing. For this reason, it becomes a structure which takes out an electric cable from the outer diameter of a sensor housing, or the side surface of a sensor housing. With the above structure, for example, in the case of a magnetic encoder, a sensor disposed on the non-rotating side raceway (fixed side raceway) side when the alternating arrangement of N poles and S poles provided on the rotary raceway rotates. Can sense the passage of the N or S pole as a periodic signal.

When incorporating a bearing into office equipment such as a copying machine or a printer, it is important to incorporate the bearing with a simple assembly structure. As an example of incorporating a bearing into the apparatus with a simple structure, a structure in which a bearing is freely attached to a steel plate (plate part) constituting an end face (flange member) of a photosensitive drum of a copying machine is provided. (Patent Document 2). In the above structure, the drive shaft is disposed so as to penetrate the photosensitive drum along the axis of the photosensitive drum. The drive shaft is disposed so as to pass through a bearing incorporated in a swingable manner on a flange plate constituting the fixed side end surface of the photosensitive drum. With the above structure, the photosensitive drum can be reliably supported while the detachability of the drive shaft and the like is improved. Further, a simple assembly structure can be realized by incorporating the bearing device into the steel plate.
Special table 2003-527541 gazette Japanese Patent Laid-Open No. 5-297777

  When the above-mentioned bearing with a rotation sensor is installed so as to penetrate the steel plate (plate portion) in order to attach it to a copying machine or the like, good detachability, reliable support and a simple structure can be realized. However, since the bearing incorporated in the flange plate of the photosensitive drum is not a bearing with a rotation sensor, the structure for incorporating the bearing into the flange plate is naturally different from that required for a bearing with a rotation sensor. . For example, in the above-mentioned bearing, it is incorporated in the flange plate so as to be rotatable as described above, and the rotation range is limited by the contact between the flange-shaped convex portion provided on the bearing and the flange plate surface. Yes. However, in the bearing with a rotation sensor in which the above-described pivotability acts on the function disadvantageously, a built-in structure basically different from the built-in structure of the bearing must be newly constructed. The built-in structure is simpler than the structure disclosed in the above-mentioned Patent Document 1, and in order to fully demonstrate the function of the bearing with the rotation sensor, positioning and the like can be easily performed with high accuracy. Should.

  An object of the present invention is to provide a bearing with a rotation sensor that can easily and accurately incorporate a bearing device into a plate portion, and a bearing device using the same.

  The sensor-equipped bearing according to the present invention includes an inner ring, an outer ring, and a plurality of rolling elements disposed between the inner ring and the outer ring, and either the inner ring or the outer ring constitutes a rotating raceway, and the other is a fixed side raceway. A sensor-equipped bearing that includes a sensor element that forms a ring and that senses the rotation of a rotation-side raceway ring and is fitted into a plate portion of an applied device. In this sensor-equipped bearing, the sensor housing that houses the sensor element and is attached to the fixed-side bearing ring has a positioning portion that determines the position of the bearing with respect to the plate portion, and a rotation-preventing portion that prevents rotation about the plate portion. It is characterized by.

  With the above configuration, in the bearing with the rotation sensor, each portion of the sensor housing with respect to the plate portion performs rotation prevention and positioning, so that the incorporation into the plate portion of office equipment or the like becomes simple and accurate. Moreover, simplification of the assembly structure of the sensor-equipped bearing is realized by incorporation into the plate portion.

  Further, the rotation preventing portion in the sensor housing can be an engaging convex portion that is provided at an end portion of the sensor housing and is fitted into an engaging concave portion that is provided continuously to the fitting hole in the plate portion. .

  With the above configuration, the sensor housing, and thus the sensor-equipped bearing can be reliably prevented from rotating by a simple structure in which the engagement recess is provided in the insertion hole of the plate portion and the engagement projection of the sensor housing is inserted. .

  Further, the positioning portion in the sensor housing can be a portion that is positioned closer to the center in the axial direction than the engaging convex portion of the rotation preventing portion in the sensor housing and abuts around the fitting hole in the plate portion.

  With the above configuration, the positioning portion of the sensor housing is brought into contact with the plate portion around the fitting hole and the engagement recess provided in the plate portion, thereby easily and accurately positioning the operation. Can be performed.

  Further, a locking mechanism can be provided in which the fixed-side raceway and the sensor housing are locked with each other.

  With the above configuration, the bearing and the sensor housing can be aligned by the locking mechanism, and the occurrence of a shift between the bearing and the sensor during use, in particular, removal can be prevented.

  Further, the outer ring constitutes a fixed-side track ring, and the locking mechanism is a locking groove provided in one of the outer ring and the sensor housing, and a convex part fitted in the groove provided in the other. Can do.

  With the above-described configuration, the bearing and the sensor housing can be aligned by a simple mechanism such as the locking groove and the convex portion, and displacement and disconnection of both can be prevented during use.

  Moreover, the bearing apparatus of this invention is an apparatus provided with the bearing with a sensor engage | inserted by the hole provided in the board part. In this bearing device, the above-mentioned hole is provided with an engagement recess for engaging the bearing with the sensor continuously, and the bearing with the sensor has a sensor housing that houses the sensor element. An anti-rotation part that is an engagement convex part that is located at the end of the sensor housing and is fitted into the engagement concave part, and a positioning that is located closer to the center in the axial direction than the engagement convex part and contacts the plate part around the hole Part.

  With the above structure, in the bearing device, the sensor-equipped bearing can be easily incorporated into the plate portion by accurately positioning the outer peripheral position and the axial position of the bearing with respect to the plate portion, and the built-in structure can be simplified. Can do.

  In the sensor-equipped bearing according to the present invention, each part of the sensor housing with respect to the plate portion stops rotation and is positioned. Become. In addition, the rotation prevention part in the sensor housing is an engagement convex part that is fitted in the engagement concave part that is continuously provided in the fitting hole of the plate part, so that the rotation prevention of the sensor housing and the bearing with the sensor is ensured. Can be done. In addition, since the positioning portion in the sensor housing is a portion that contacts the periphery of the fitting hole in the plate portion, the positioning can be performed easily and accurately with a simple structure. Further, by providing a locking mechanism in which the fixed-side raceway and the sensor housing are locked to each other, the positioning of the bearing and the sensor housing is performed by the locking mechanism, and the bearing and the sensor in use The occurrence of deviation can be prevented. Further, the outer ring is a fixed raceway, and the locking mechanism is a locking groove provided in one of the outer ring and the sensor housing, and a convex portion fitted in the groove provided in the other, whereby the locking groove By using a simple mechanism such as a convex portion, the bearing and the sensor housing can be aligned to prevent misalignment during use. In the bearing device of the present invention, the sensor-equipped bearing can be accurately positioned at the outer peripheral position and the axial position of the bearing with respect to the plate portion, and can be incorporated into the plate portion with a simplified structure by work. it can.

  Next, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram showing mounting of a sensor-equipped bearing and its bearing device on a plate portion according to Embodiment 1 of the present invention. The bearing device corresponds to office equipment such as a copying machine and a printer. In the sensor-equipped bearing 50, for example, the sensor housing 1 formed of resin or the like is attached to the outer ring 10b of the bearing. A sensor element (not shown) for sensing a rotation signal is fixed to the sensor housing. As shown in FIG. 1, the outer ring 10b constitutes a fixed side raceway, and the inner ring constitutes a rotation side raceway.

  A sensor active part (not shown) that emits a rotation signal is integrated with the code wheel 4. The code wheel 4 is separated from the sensor housing 1 and rotates with a rotating shaft (not shown). Here, the code wheel includes a sensor active unit that emits a signal to be sensed by the sensor element, such as an alternating arrangement of S and N poles of a permanent magnet or an alternating arrangement of a non-reflector and a reflecting mirror. It is a general term for rotating bodies.

  When the sensor active part is a magnetic type, the N pole and S pole of the permanent magnet are alternately arranged in a circle, and the sensor element senses the change of the magnetic pole of the permanent magnet, and the rectangular wave (pulse shape) or the like Outputs electrical signals. In the case of the optical type, a reflective surface and a non-reflective surface opposite to the sensor element are alternately arranged in a circle so that the sensor element senses on / off of light and outputs a rectangular wave-like electrical output. The sensor active part is sometimes referred to as an encoder because of the signal generation characteristics of an on / off (pulse-like) digital signal due to such an arrangement.

  The outer ring 10b of the fixed-side track ring and the sensor housing 1 attached thereto sense a signal from the rotating encoder at a predetermined position without rotating. A cable 21 for inputting a sensed signal from a sensor element to a processing circuit or the like is drawn out through the sensor housing.

The sensor-equipped bearing 50 and the hole h ₁ of the plate portion (steel plate housing) 31 of the bearing device share the axis Lc that is the central axis. The sensor-equipped bearing 50 is mounted by inserting the end of the sensor-equipped bearing 50 into the fitting hole h ₁ and the engaging recess h ₂ of the plate portion 31. The hole h ₁ has an inner diameter into which the outer diameter of the bearing 10 (the outer peripheral surface of the outer ring 10b) is fitted, and is roughly associated with each other as indicated by lines L ₂ and L ₃ . An engagement recess h ₂ is further provided continuously with the hole h _1, and a rotation preventing portion (engagement projection) 7 of the sensor housing 1 is fitted into the engagement recess h ₂ . When this fitting, the inner diameter of the hole h ₁ as described above is sized to the outer peripheral surface of the outer ring 10b is fitted, does not greatly exceed it (degree slightly larger), the sensor housing is a positioning portion 8 of the sensor housing 1 The end surface portion of the contact portion abuts on the plate portion 31 of the bearing device. As a result, the axial relative position between the sensor-equipped bearing 50 and the plate portion 31 is determined. The positioning portion 8 can be rephrased as a thickness portion of the sensor housing 1 covering the outer ring from the outside or a portion extending in the radial direction when viewed from the central axis. Note that the positioning portion 8 and the plate portion 31 do not always have to be in contact with each other, and it is not necessary to maintain the contact state as long as the positioning portion and the plate portion are in contact with each other during positioning.

  2A to 2C are diagrams showing the sensor-equipped bearing according to the first embodiment. In FIG. 2A, the bearing 10 includes an inner ring 10a, an outer ring 10b, and rolling elements (steel balls) 10c. The sensor housing 1 in which the sensor element 3 is accommodated is attached and fixed to the outer diameter of the outer ring 10b constituting the fixed side raceway ring. The sensor housing 1 formed of resin or the like is separated from the rotating shaft 25 (FIG. 3). In the present embodiment, the code wheel 4 is provided as a separate body of the bearing 10. A sensor active portion 5 is attached to the code wheel 4 so as to face the sensor element 3.

  FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. The sensor element 3 is attached to the substrate 2, and the sensor signal is drawn out from the circuit of the substrate 2 through the cable 21. The substrate 2 is fixed to the sensor housing 1 by a substrate stopper 2a such as a screw or heat caulking. The sensor active portion 5 is disposed on the code wheel so as to face the sensor element 3 from the inner diameter side. The sensor active unit 5 may be, for example, a repetitive arrangement of N and S poles attached to the code wheel 4. The sensor housing 1 is fitted and fixed so as to cover the outer periphery of the outer ring 10b. A groove 9 is provided on the outer peripheral surface of the outer ring 10b, and a convex portion (projection) 19 of the sensor housing 1 is engaged with the groove 9 so that the sensor housing and the outer ring are not separated from each other. FIG. 2C is a side view of FIG. In the bearing 10, the sensor housing 1 having the rotation preventing portion 7 and the positioning portion 8 is fitted into the outer peripheral edge portion of the outer ring 10 b.

  FIG. 3 is a view showing the sensor-equipped bearing that is mounted on the plate portion 31 of the bearing device and through which the rotary shaft 25 is inserted. That is, it is a diagram showing a state after the mounting of FIG. 1 is performed. The rotary shaft 25 is inserted through the inner diameter of the inner ring 10 a of the bearing 10. The inner ring 10 a constituting the rotation side raceway ring is attached to the rotation shaft 25 and rotates together with the rotation shaft 25. As described above, the code wheel 4 to which the sensor active portion (encoder) 5 is fixed is attached to the rotary shaft 25 and rotates together with the rotary shaft 25 in the same manner as the inner ring. As shown below, there are a plurality of methods for attaching the code wheel 4. In the case of the structure shown in FIG. 3 in which the code wheel 4 is directly attached to the rotary shaft 25, the rotary shaft 25 is directly used as a rattling stop of the code wheel 4 in order to maintain the above-described arrangement more stably. A ratchet spring 14 such as a spring is disposed between the retaining ring 13 provided on the rotary shaft 25 and the code wheel 4.

The sensor-equipped bearing 50 is fitted into the hole h ₁ and the engaging recess h ₂ of the plate portion 31. At that time, the outer ring 10b and the end of the sensor housing 1 are inserted into the hole h ₁ and the engaging recess h ₂ . The end of the sensor housing 1 has detent portion 7 is provided, the detent portion 7 is fitted in the engaging recess h _2. Further, the plate portion 31 abuts on the positioning portion 8 located on the center side in the axial direction of the rotation preventing portion 7 of the sensor housing 1. Because of this contact, the relative position between the sensor-equipped housing 50 and the plate portion 31 is accurately determined. As described above, the plate portion 31 and the positioning portion 8 need not always maintain contact.

(Embodiment 2)
4 (a) and 4 (b) are diagrams showing a sensor-equipped bearing according to Embodiment 2 of the present invention. In FIG. 4A, the code wheel 4 is attached to the outer diameter side of the inner ring 10 a of the bearing 10.

  FIG. 4B is a cross-sectional view taken along line IVB-IVB in FIG. The sensor element 3 is attached to the substrate 2, and the sensor signal is drawn out from the circuit of the substrate through the cable 21. The substrate 2 is fixed to the outer ring 10b by a substrate stopper 2a such as a screw or heat caulking. A sensor active portion 5 is disposed on the code wheel 4 so as to face the sensor element 3. The sensor active unit 5 may be, for example, a repetitive arrangement of N and S poles attached to the code wheel 4.

  The rotation preventing portion 7 and the positioning portion 8 of the sensor housing 1 are positioned so as to cover the outer ring 10 b of the bearing 10. In the present embodiment, since the code wheel 4 is attached to the inner ring 10a, a ratchet spring or the like is not necessary. For this reason, the mounting of the sensor-equipped bearing on the plate portion of the bearing device including the rotating shaft becomes easier than in the first embodiment.

Further, the rotation preventing portion 7 and the positioning portion 8 are the same as the shape shown in the first embodiment, and are fitted in the hole h ₁ and the engagement concave portion h ₂ of the plate portion 31 and have the same functions as those in the first embodiment. Fulfills the function.

(Embodiment 3)
5 (a) and 5 (b) are diagrams showing a sensor-equipped bearing according to Embodiment 3 of the present invention. In FIG. 5A, the code wheel 4 is attached to the inner diameter side of the inner ring 10 a of the bearing 10.

  FIG.5 (b) is sectional drawing which follows the VB-VB line | wire in Fig.5 (a). The sensor element 3 is attached to the substrate 2, and the sensor signal is drawn out from the circuit of the substrate through the cable 21. The sensor active portion 5 is disposed on the code wheel 4 so as to face the sensor element 3 from the inner diameter side. The sensor active unit 5 may be, for example, a repetitive arrangement of N and S poles attached to the code wheel 4.

In the present embodiment, since the code wheel 4 is attached to the inner ring and attached to the rotating shaft, stable and strong attachment is possible with little backlash, and no rattling spring or the like is required. For this reason, the mounting of the sensor-equipped bearing on the plate portion of the bearing device including the rotating shaft becomes easier than in the first embodiment. Further, the rotation preventing portion 7 and the positioning portion 8 are fitted into the hole h ₁ and the engaging recess h ₂ of the plate portion 31 and perform the same function as the function in the first embodiment.

  The sensor-equipped bearing of the present invention generally has the following configuration. That is, it includes an inner ring 10a, an outer ring 10b, and a plurality of rolling elements 10c disposed between the inner ring and the outer ring, and either the inner ring or the outer ring constitutes a rotating side race ring, and the other constitutes a fixed side race ring. The sensor-equipped bearing 50 includes the sensor element 3 that senses the rotation of the rotation-side bearing ring, and is used by being fitted into the plate portion 31 of the device to be applied. In the sensor-equipped bearing 50, the sensor housing 1 that houses the sensor element 3 and is attached to the fixed-side bearing ring includes a positioning portion 8 that determines the position of the bearing with respect to the plate portion 31, and a rotation that prevents a rotation shift with respect to the plate portion 31. And a stop 7.

  With the above configuration, the sensor housing functions as both positioning and detent. Therefore, the structure for incorporating into the plate (steel) housing often used in office equipment is simplified, and the assembly work can be performed very accurately and easily. Can do. Further, in the production of the sensor-equipped bearing itself, it can be produced without adding positioning components.

More specifically, the rotation preventing portion 7 in the sensor housing 1 is fitted in an engagement recess h ₂ provided at an end portion of the sensor housing ₁ and continuously provided in the fitting hole h ₁ in the plate portion 31. It can be made the engaging convex part 7 to be. With this configuration, the rotation preventing portion and the positioning portion can be easily provided on the sensor housing and the steel plate, and the sensor-equipped bearing can be incorporated into the apparatus. Therefore, it is possible to provide a sensor-equipped bearing that can easily form an accurate arrangement for incorporation into the apparatus at a low cost.

  Specifically, the positioning portion 8 in the sensor housing 1 is positioned closer to the center in the axial direction than the engaging convex portion 7 of the rotation preventing portion in the sensor housing, and is in contact with the periphery of the fitting hole in the plate portion. Can be. By using this structure, the positioning portion can be easily formed together with the rotation preventing portion.

  Moreover, the outer ring | wheel 10b and the sensor housing 1 can be provided with the latching mechanism which mutually latches. This locking mechanism makes it difficult for the outer ring and the sensor housing to come off. Note that the locking mechanism includes not only a disconnection due to a relative movement along the axial direction, but also a mechanism that prevents a relative rotational shift. By providing the grooves intermittently along the outer periphery instead of providing them on the entire outer periphery of the outer ring 10b, it is possible to prevent not only the removal along the axial direction but also the mutual rotation.

  The locking mechanism may be the locking groove 9 provided in one of the outer ring 10b and the sensor housing 1, and the convex portion 19 fitted in the groove provided in the other. As described above, the locking groove 9 may be a groove provided over the entire circumference, or a groove provided intermittently along the circumference. A convex portion 19 is also formed in accordance with this groove. With this structure, it is possible to prevent the outer ring and the sensor housing from being separated from each other and to prevent the rotational deviation with a simple mechanism.

The bearing device of the present invention is a device including a sensor-equipped bearing that is fitted in a hole provided in the plate portion 31. In this bearing device, the hole h ₁ is continuously provided with an engaging recess h _{2 in} which the sensor bearing 50 is engaged. The sensor bearing 50 includes the sensor housing 1 that houses the sensor element 3. The sensor housing 1 is positioned at an end portion of the sensor housing and is an anti-rotation portion 7 that is an engaging convex portion that is fitted into the engaging concave portion h ₂ , and is positioned closer to the axial center than the engaging convex portion. And a positioning portion 8 that comes into contact with the plate portion around the hole.

  A bearing device incorporating the above-mentioned bearing with a rotation sensor, for example, office equipment, can be mounted on a steel plate portion with a simple, accurate and simple built-in structure. Can be obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  By using the sensor-equipped bearing according to the present invention, it is possible to obtain a rotation sensor-equipped bearing that can be easily and accurately incorporated into office equipment and has a simplified assembling structure. As a result, it is possible to make the office equipment apparatus inexpensive and compact.

It is a figure which shows the bearing with a sensor in Embodiment 1 of this invention, and the mounting | wearing to the board part. The bearing with a sensor in Embodiment 1 of this invention is shown, (a) is sectional drawing, (b) is sectional drawing which follows the IIB-IIB line in (a), (c) is a side view of (a). It is. It is sectional drawing which shows the state which mounted | wore the plate part with the sensor-equipped bearing of FIG. The bearing with a sensor in Embodiment 2 of this invention is shown, (a) is sectional drawing, (b) is sectional drawing which follows the IVB-IVB line | wire in (a). The bearing with a sensor in Embodiment 3 of this invention is shown, (a) is sectional drawing, (b) is sectional drawing which follows the VB-VB line | wire in (a).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Sensor housing, 2 Substrate, 2a Substrate stop, 3 Sensor element, 4 Code wheel, 5 Sensor active part, 7 Anti-rotation convex part, 8 Positioning part, 9 Outer ring groove, 10 Bearing, 10a Inner ring, 10b Outer ring, 10c Moving body (steel ball), 13 retaining ring, 14 ratchet spring, 19 convex part, 21 cable, 25 rotating shaft, 31 plate part, 50 bearing with sensor.

Claims (6)

An inner ring, an outer ring, and a plurality of rolling elements disposed between the inner ring and the outer ring, wherein one of the inner ring and the outer ring constitutes a rotating side race ring, and the other constitutes a fixed side race ring, A sensor-equipped bearing that includes a sensor element that senses the rotation of the rotating raceway, and is used by being fitted into a plate portion of an applied device,
A sensor housing that houses the sensor element and is attached to the fixed-side bearing ring includes a positioning portion that determines a position of the bearing with respect to the plate portion, and a rotation prevention portion that prevents rotation with respect to the plate portion. bearing.   The rotation preventing portion in the sensor housing is an engaging convex portion that is provided at an end portion of the sensor housing and is fitted into an engaging concave portion that is provided continuously with the fitting hole in the plate portion. Bearing with sensor as described in 1.   The positioning portion in the sensor housing is a portion that is located closer to the center in the axial direction than the engaging convex portion of the rotation preventing portion in the sensor housing and is in contact with the periphery of the fitting hole in the plate portion. The sensor-equipped bearing according to 2.   The bearing with a sensor in any one of Claims 1-3 provided with the latching mechanism in which the said stationary-side track ring and the said sensor housing mutually latch.   The outer ring constitutes a stationary raceway, and the locking mechanism is a locking groove provided in one of the outer ring and the sensor housing, and a convex portion fitted in the groove provided in the other. Item 5. The sensor-equipped bearing according to Item 4. An apparatus comprising a sensor-equipped bearing fitted in a hole provided in a plate part,
The hole is continuously provided with an engagement recess for engaging the bearing with sensor,
The sensor-equipped bearing has a sensor housing that houses a sensor element,
The sensor housing is located at an end of the sensor housing and is an anti-rotation portion that is an engaging convex portion that is fitted into the engaging concave portion, and the hole is located closer to the axial center than the engaging convex portion. And a positioning part that abuts on a peripheral plate part.

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