JP2015007442A - Bearing seal, bearing, and vehicular bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing seal which can be integrated in a seal unit body, in a sensor assembling state, and in a bearing assembling state; facilitates handling and assembling of a sliding part, and gives proper sliding resistance.SOLUTION: Between a first seal component 2 having a large-diameter ring 21 on the outermost part and a second seal component 3 having an inside annular portion 31 on the innermost part, an elastic seal ring 4 is provided so as to rotate and seal the first and second seal components about an axis. The first and second seal components, and the elastic seal are fixed in an axial direction by a seal retaining ring 6 and a fixing member 5. On either one of the first or second seal components, a rotation sensor 7 is provided. The large diameter ring is pressed in an inner diameter end 13a of a bearing outer ring, and a labyrinth seal is formed on an inside annular portion 31a side. Or, the inside annular portion is pressed in an outer diameter end of a bearing inner ring, and the labyrinth seal is formed on the large diameter ring side.

Description

  The present invention relates to a seal for a rolling bearing having a rolling element that rolls between an outer inner ring and an outer inner ring, and more particularly, a bearing seal that can be attached with a rotation sensor, a bearing using the same, and a vehicle using the bearing. The present invention relates to a bearing device.

  Conventionally, seals are provided at the ends of the inner and outer rings in order to prevent dust, water oil and the like from entering between the inner and outer rings of the rolling bearing, and leakage of lubricant and lubricating oil. On the other hand, in a railway vehicle or an automobile, rotation of an axle or the like is detected using a rotation sensor in order to measure the vehicle speed. This rotation sensor is integrally attached to the seal member in order to reduce the weight and size of the parts. Furthermore, for convenience of handling, the seal and sensor are integrated into the bearing. At this time, the sensor is fixed to the fixed side, for example, when the inner ring rotates, to transmit the measurement data, to the outer ring side.

  However, the outer ring (or inner ring) fixed to the fixed side, for example, the housing may cause a creep phenomenon by use. When creep occurs, the outer ring rotates with the sensor relative to the housing, and the wiring of the sensor is entangled and disconnected. Therefore, the allowance for press-fitting the outer ring is increased so as not to cause creep. A groove is provided on the outer periphery. An O-ring is installed on the outer periphery. Insert the pin. Alternatively, the sensor is prevented from rotating with respect to the housing part by, for example, extending a protrusion from the mounting seal (sensor holder) toward the housing (Patent Document). 1). However, providing such a detent is disadvantageous in terms of bearing maintenance and compatibility. Further, the processing on the housing side increases.

  Therefore, in Patent Document 2, the bearing seal is fixed to the housing so that the bearing seal to which the sensor is attached can rotate relative to the seal portion (fitting portion) of the fixed ring. As a result, even if the fixed wheel is displaced in the rotation direction due to creep, the sensor maintains the fixed position, so there is no disconnection or the like.

  In Patent Document 3, the seal portion of the bearing seal is slidably fitted in a circumferential groove (general seal groove) provided on the inner periphery of the outer ring (fixed ring). Also. 9 to 10 (fourth and fifth embodiment lines), a sensor holder to which a sensor is attached is fixed to a ring member press-fitted into an outer ring with a fixing member so as to be rotatably fitted.

JP 2010-007822 A Japanese Patent No. 2614199 JP 2012-053002 A

  However, the thing of patent document 2 only fits an elastic-lubricating part in the outer ring | wheel (fixed ring) inner peripheral surface so that a slide around an axis | shaft is possible. For this reason, if it is easy to slide, the sensor holder is easily detached and difficult to handle. On the contrary, if it is difficult to come off, it will be difficult to slide, and the detent must be strengthened. Further, there is a problem that the elastic lubrication part is abnormally worn. Moreover, since the thing of patent document 3 fits the outer periphery of a sensor holder in the seal groove of an outer ring | wheel inner periphery, there existed the same problem as patent document 2. FIG. Moreover, since it becomes difficult to deform | transform when using hard resin in order to make it easy to slide, there existed a problem that it was difficult to fit in and taking out to a seal groove, and there was a possibility of causing a damage. Further, in FIGS. 9 to 10 of Patent Document 3, it cannot be integrated before being attached to the bearing. Further, there is a problem that the sensor holder is easily detached even when it is attached to the bearing.

  In view of the above-described problems, an object of the present invention is to provide a bearing seal that can be integrated even in a seal unit and a bearing built-in state and is easy to handle. It is another object of the present invention to provide a bearing seal, a bearing, and a vehicle bearing device that can easily incorporate a sliding portion and can provide appropriate sliding (sliding) resistance.

  In the present invention, the first seal part having the outermost large-diameter ring, the second seal part having the innermost inner ring part, and the first and second seal parts, An elastic seal ring in which the first and second seal parts are rotatable about an axis and sealed between the first and second seal parts; and the first seal, the second seal part, and the elastic seal are axially arranged. The above-described problems have been solved by providing a bearing seal having a fixing member that is fixed to the head.

  That is, the seal is divided into an outer part and an inner part, the outer part and the inner part are rotatable relative to each other around the axis, and an elastic seal ring is interposed in the divided part to provide a sealing function and rotation (sliding or sliding) resistance. give. It is fixed with a fixing member so as not to separate in the axial direction. The elastic seal is preferably a ring-shaped seal having a simple cross section such as an O-ring, an X-ring, or a square ring, and the material is suitably selected from rubber, synthetic resin, metal, and the like.

  According to a second aspect of the present invention, there is provided a bearing seal in which a rotation sensor body for detecting rotation is provided on one of the first or second seal parts. Thereby, it can be set as the component which integrated the seal | sticker and the sensor.

  More specifically, in the invention according to claim 3, as a specific structure, the large-diameter ring, a medium-diameter ring connected to the large-diameter ring, and the anti-large-diameter circle opposite to the medium-diameter ring. A hollow disk-shaped end surface portion extending toward the inner diameter side of the ring-side end surface, the first seal component, an outer ring portion rotatably fitted around the outer periphery of the medium-diameter ring and the axis, A hollow that is provided inside the outer ring part and has a smaller diameter than the medium-diameter ring, and a hollow that is provided on the side opposite to the large-diameter ring and connects the outer ring part and the inner ring part. A disk-shaped wall, the second seal component, an inner peripheral surface of the medium-diameter annular ring and an outer peripheral portion rotatably fitted around an axis, and an outer diameter larger than the inner annular portion A seal pressing ring having an inner peripheral part, a step part provided on the wall part side of the outer peripheral part, and an end surface part contacting the wall part, and the sheet The hollow disk-like end surface portion and the elastic seal ring, comprising: a fixing member that abuts and fixes the end surface portion of the pressing ring and the wall portion; and the elastic seal ring fitted to the outer periphery of the step portion. Is a bearing seal sandwiched between the wall portion and the outer peripheral end face of the stepped portion.

  The first seal part and the second seal part consist of the outer circumference of the medium-diameter ring of the first seal part, the outer ring part of the second seal, the inner circumference of the medium-diameter ring of the first seal part, and the seal holding ring. The outer periphery and the shaft are fitted so as to be rotatable, and movement in the radial direction is restricted. The concentricity can be improved by reducing the gap between the fitting portions. In addition, you may make it fit the hollow disk shaped end surface part internal diameter of a 1st seal | sticker part, and the step part of a seal | sticker pressing ring. As for the axial direction, the fixing member abuts and fixes the wall portion of the second seal part and the end surface portion of the seal pressing ring so as to be integrated. At the same time, since the hollow disc-shaped end surface portion of the first seal component and the elastic seal ring are sandwiched between the wall portion and the outer peripheral end surface of the step portion, the first seal component is integrated with the second seal component. The first seal and the second seal are fixed so as to be movable in the axial direction by the amount of elastic deformation of the elastic seal ring. The slip resistance in the rotational direction around the axis can be adjusted by the material of the elastic seal and the amount of strain. Accordingly, the first and second seal parts can be rotated and integrated.

  Further, the sliding surface between the first and second seal parts is generated in a place where the sliding resistance is small. Therefore, in the invention according to claim 4, between the wall portion and the hollow disk-shaped end surface portion, the hollow disk-shaped end surface portion, the elastic seal ring, and the outer peripheral portion end surface of the stepped portion. And a bearing seal that can be slidably contacted or slidable in the axial direction at any of the contact surfaces.

  Since the seal portion is provided between the first and second seal components, press fitting may be used for mounting the bearing on the fixed ring side. Therefore, a bearing in which the large-diameter ring of the bearing seal is press-fitted into the inner diameter end of the bearing outer ring (Claim 5), the outer ring is fixed to the bearing housing, and the inner ring portion is fixed to the bearing outer ring. Thus, a bearing device for a vehicle that forms a labyrinth seal with an inner ring that rotates around an axis via a rolling element or a rotating member that is integrated with the inner ring is provided.

  Alternatively, the inner ring portion of the bearing seal is a bearing press-fitted into the outer diameter end of the bearing inner ring (Claim 6), the inner ring is fixed to a fixed shaft, and the large-diameter ring is the bearing inner ring. On the other hand, a bearing device for a vehicle that forms a labyrinth seal with an outer ring rotating around an axis via a rolling element or a rotating member integrated with the outer ring is provided.

  In the present invention, the seal is divided into an outer part and an inner part, and an elastic seal ring is interposed in the divided part to provide a sealing function and rotational (sliding or sliding) resistance, thereby providing an integrated bearing seal. As a result, the bearing seal was easy to handle.

  In the invention according to claim 2, since the bearing seal and the sensor can be integrated, a sensor-equipped bearing seal that is easy to handle is obtained. Further, in the invention according to claim 3, the first seal part and the second seal part are integrated by elastically restricting radial movement and axial movement, and adjusting the sliding resistance in the rotational direction around the axis. As a result, the sliding part can be easily incorporated and appropriate sliding resistance can be provided.

  In the invention according to claim 4, the sliding surface between the first and second seal parts is generated where the sliding resistance is low, and it can be a low resistance seal and has a long life. Further, in the inventions according to claims 5 to 8, the bearing seal of the present invention can be integrated with the bearing and can be easily attached to the housing and the rotating shaft, so that the bearing and the vehicle bearing are easy to handle and maintain. Became a device.

BRIEF DESCRIPTION OF THE DRAWINGS (a) of the bearing seal which shows embodiment of this invention is a front view, (b) is the sectional view on the AA line of (a), (c) is the elements on larger scale near an elastic seal. BRIEF DESCRIPTION OF THE DRAWINGS (a) of the vehicle bearing device which shows embodiment of this invention is a front view, (b) is the BB sectional drawing of (a).

  Embodiments of the present invention will be described with reference to the drawings. In the embodiment of the present invention, a case where the present invention is applied to a railway vehicle bearing device as described in Patent Document 1 will be described. As shown in FIG. 1, the bearing seal 1 includes a first seal component 2 having an outermost thin large-diameter ring 21, and a second seal component 3 having an innermost thin inner ring portion 31. Have An elastic seal ring (O-ring) 4 is provided between the first and second seal parts so that the first and second seal parts can rotate relative to each other around the axis and can seal between the first and second seal parts. Has been. The first seal, the second seal component, and the elastic seal are fixed in the axial direction by the fixing member 5.

  As shown in FIG. 1 (c), the first seal part 2 is a thin metal material and is molded by a press, and has a medium-diameter ring 22 connected to the large-diameter ring 21 and an anti-large-sized medium-diameter ring. It has a hollow disk-shaped end surface portion 23 extending toward the inner diameter side of the end surface on the radial ring side.

  Similarly, the second seal component 3 is a thin metal material, and is molded by pressing, and an outer ring portion 32 that is rotatably fitted around the outer circumference 22a of the medium-diameter ring 22 and an outer ring. A hollow disk-shaped wall 33 that is provided on the inner side of the inner ring portion and that is smaller in diameter than the medium-diameter ring and that connects the outer and inner ring portions provided on the side opposite to the large-diameter ring 21 Have As shown in FIGS. 1A and 1B, along the circumference of the wall portion 33, two sensor through holes 34 for mounting the sensor are opened, and the through hole 35 through which the screw portion of the fixing member (bolt) 5 passes. Is opened in three equal places. Protrusions 36 are provided that project at two locations in the radial direction, with a portion of the outer annular portion 32 being flush with the wall.

  The end surface portion 61 of the seal pressing ring 6 is in contact with the surface 33a of the wall portion 33 on the first seal component 2 side. The seal retainer ring 6 includes an inner peripheral surface 22b of the medium-diameter annular ring 22 and an outer peripheral portion 63 that is rotatably fitted around the axis, and an inner diameter larger than the outer diameter 31b of the inner annular portion 31 of the second seal part 3. It is a thick member composed of the peripheral portion 64. The fixing member (bolt) 5 is passed through the through hole 35 of the second seal part 3 and screwed into the screw hole 62 formed in the seal press ring 6, and the second seal part 3 and the seal press ring 6 are fixed. Yes. The seal retainer ring 6 is further provided with two sensor screw holes 66 at the same position as the sensor through hole 34 (FIG. 2B).

  A stepped portion 65 is provided on the outer peripheral portion 63 of the seal pressing ring 6 on the wall 33 side. The hollow disc-shaped end surface portion 23 and the elastic seal ring 4 of the first seal component are sandwiched between the wall portion 33 and the outer peripheral end surface 65b of the step portion 65. The distance between the wall portion and the outer peripheral end surface is smaller than the sum of the thickness of the hollow disk-shaped end surface portion 23 and the diameter of the O-ring (elastic seal ring) in the free state, and is clamped with elasticity in the axial direction and the radial direction. Has been.

  According to such a bearing seal, the outer (first) 2 and inner (second) seal component 3 can be rotated relative to each other around the axis, providing a sealing function and rotation (sliding or sliding) resistance, and not separated. Can be integrated and is easy to handle as a bearing seal. A seal groove (O-ring groove) 61 a is provided on the inner peripheral portion 64 side of the end surface portion 61 of the seal pressing ring 6, a seal (O-ring) 8 is inserted, and the end surfaces 61 and the end surfaces of the seal pressing ring 6 are inserted. The space between the portions 61 is sealed. In addition, a screw sealant is applied to the threaded portion of the bolt 5 to prevent water and dust from entering the bearing and prevent leakage of lubricant such as grease from the bearing.

  Further, as shown in FIG. 2, the mounting plate 7 a of the rotation sensor 7 is screwed into the sensor screw hole 66 through the sensor through hole 34 of the second seal part 3 with the bolt 51, and the rotation sensor 7 is sealed with the bearing seal. 1 is fixed to the outer surface of the wall 33 of the second seal component 2. Further, as shown in FIGS. 1 (a) and 2 (a), the rotation sensor 7 is also fixed by a screw 52 in a screw screw hole 67 opened in the outer peripheral surface 32a of the outer annular portion 32 of the second seal part. . Since the rotation sensor is the same as the conventional one, its description is omitted. Thus, according to the embodiment of the present invention, the bearing seal can be integrated with or without the rotation sensor, and the handling is easy.

  An embodiment of a bearing device for a railway vehicle according to the present invention in which the bearing seal 1 is applied to a bearing device for a railway vehicle will be described with reference to FIG. The railway vehicle bearing device 11 of this embodiment uses a double-row tapered roller bearing 12. The double-row tapered roller bearing 12 is double-rowed via an outer ring (fixed ring) 13 that is always kept in a non-rotating state in a housing (not shown), and a spacer 14 a that is rotatably arranged facing the inner side of the outer ring 13. The inner rings (rotating wheels) 14 and 14 aligned with the back surface of the outer ring 13 and the outer ring 13 and the inner ring 14 are rolled in a double row and a plurality of tapered rollers (rolling elements) 15 and 15. The plurality of rolling elements are held at equal intervals by resin cages 16 and 16.

  An axle 17 is fitted through the inner rings 14 and 14. A small-diameter cylindrical portion 17a and a screw portion 17b are provided at the tip of the axle. A shoulder portion 17c is provided on the proximal end side. Oil draining members 18 and 19 are provided on both end faces of the inner rings 14 and 14. The pressure nut 20 is screwed to the threaded portion 17b to press the shaft end side oil draining member 19, and the oil draining member 18, the inner ring 14, the spacer 14a, the inner ring 14, and the oil draining member 19 are connected to the pressing nut 20. It is clamped between the shoulder portions 17c. Further, the tip 81 a of the rotation stopper 81 is fitted in the axle screw portion recess 17 d and the recess 20 a of the pressing nut 20, and is screwed and fixed to the pressing nut with a bolt 53. The opening and axle end of the rotation stopper 81 are covered with a cover 54.

  The outer annular portion 25a of the seal member 25 is press-fitted into the inner diameter end 13b on the shoulder 17c side of the outer ring 13, and the other end 25b forms a labyrinth seal with the annular recess 18a of the oil draining member 18 on the shoulder portion side. An oil seal 26 is fitted inside the seal member 25, and the oil seal inner peripheral lip is rotatable about the outer peripheral surface 18 b of the oil draining member 18 to seal (seal) the inside and outside of the bearing 12. Yes. Since the structure of such a railway vehicle bearing is the same as the conventional one, further description is omitted.

  In the embodiment of the present invention, the shaft end side seal is the above-described bearing seal member 1 of the present invention. The large-diameter annular ring 21 of the first seal component 2 of the bearing seal 1 described with reference to FIG. 1 is press-fitted into the shaft end side inner diameter end 13 a of the outer ring 13. The tip 31a of the inner ring portion 31 of the second seal part 3 is immersed in an annular recess 19a formed in the oil draining member 19 on the axle tip side to form a labyrinth seal. This provides a sealing mechanism similar to the conventional one. Furthermore, as described above, the rotation sensor 7 is fixed to the outer surface of the wall portion 33 of the second seal part 3 of the bearing seal 1. The wiring 71 of the rotation sensor is extended and connected to the housing side (not shown). Further, two protruding portions 36 on the same surface as the wall portion 33 are inserted into notch portions of a housing (not shown) so that the rotation is restricted or prevented from rotating.

  As a result, even if the outer ring 13 creeps, the second seal part 3 to which the rotation sensor 7 is attached is made rotatable by the elastic seal ring 4 in the axial circumferential direction, and the rotation is restricted by the protrusion 36. The wiring of the rotation first sensor 7 does not break. Further, the protrusion 36 does not require a particularly high strength.

  In assembly, the bearing 12 and the oil draining member 19 into which the oil draining member 18 and the seal member 25 are press-fitted into the axle 17 are sequentially fitted, and then the bearing seal 1 of the present invention is press-fitted into the shaft end side inner diameter end 13a. The fixing nut 20, the rotation stopper 81, and the bolt 53 are used for fixing. The rotation sensor 7 may be assembled in a state of being assembled to the bearing seal 1 or may be assembled later. Furthermore, it is possible to replace only the rotation sensor.

  As described above, in the embodiment of the present invention, the bearing seal 1 can be easily and integrally handled regardless of the presence or absence of the rotation sensor 7, and can be assembled and disassembled to the vehicle bearing device 11 in the same manner as in the past. It became to secure. Further, disconnection of the rotation sensor due to creep of the outer ring (fixed ring) can be prevented.

  In the present embodiment, a railway vehicle bearing device using a double row tapered roller bearing has been described, but it can also be applied to a bearing device with a sensor such as an automobile, a single row bearing, a ball bearing, a roller bearing, etc. Needless to say. Further, although the outer ring 13 is fixed, when the inner ring 14 side is fixed, the rotation sensor 7 may be attached to the first seal component 2 side. Further, the large-diameter ring 21 of the first seal part and the inner ring part 31 of the second seal part can be press-fitted or labyrinth-sealed, but elastic press-fitting or lip seals may be used. .

DESCRIPTION OF SYMBOLS 1 Seal for bearings 2 First seal component 21 Large-diameter ring 22 Medium-diameter ring 22a Middle-diameter ring outer circumference 22b Medium-diameter ring inner circumference 23 Hollow disk-like end face 23a Hollow disk-like end-face inner circumference 3 2nd seal component 31 Inner ring part 31b Outer diameter 32 of inner ring part Outer ring part 33 Wall part 4 Elastic seal ring 5 Fixing member 6 Seal pressing ring 61 End face part 63 (Seal pressing ring) outer peripheral part 64 ( Inner peripheral portion 65 (of the seal retaining ring) Step portion 65a Step portion outer periphery 65b Step portion outer peripheral end face 7 Rotation sensor (main body)
DESCRIPTION OF SYMBOLS 11 Vehicle bearing apparatus 12 Bearing 13 (Bearing) Outer ring 13a Inner diameter end 14 (Bearing) Inner ring 15 Rolling element 17 Rotating member (axle)

Claims (8)

  A first seal part having an outermost large-diameter ring, a second seal part having an innermost inner ring part, and the first and second seals between the first and second seal parts. An elastic seal ring in which a part can rotate around an axis and can seal between the first and second seal parts, and a fixing member for fixing the first seal, the second seal part and the elastic seal in the axial direction And a bearing seal.   The bearing seal according to claim 1, wherein a rotation sensor main body for detecting rotation is provided on one of the first or second seal parts. The large-diameter annular ring, a medium-diameter annular ring connected to the large-diameter annular ring, and a hollow disk-shaped end surface portion that extends to the inner-diameter side end surface opposite to the large-diameter annular ring. The first seal component;
An outer ring portion that is rotatably fitted around an outer periphery and an axis of the medium-diameter ring; an inner ring portion that is provided inside the outer ring portion and has a smaller diameter than the medium-diameter ring; A hollow disc-shaped wall portion provided on the large-diameter annular side and connecting the outer annular portion and the inner annular portion; and the second seal part,
Provided on the inner peripheral surface of the medium-diameter ring and an outer peripheral portion that is rotatably fitted around the axis, an inner peripheral portion that is larger than the outer diameter of the inner annular portion, and the wall portion side of the outer peripheral portion. A seal pressing ring having a stepped portion and an end surface portion in contact with the wall portion;
A fixing member that abuts and fixes the end surface portion of the seal pressing ring and the wall portion;
The elastic seal ring fitted to the outer periphery of the step, and
The bearing seal according to claim 1 or 2, wherein the hollow disk-shaped end surface portion and the elastic seal ring are sandwiched between the wall portion and the outer peripheral end surface of the stepped portion.   Between the wall portion and the hollow disk-shaped end surface portion, and at any one of the contact surfaces of the hollow disk-shaped end surface portion, the elastic seal ring, and the outer peripheral portion end surface of the stepped portion, a shaft 4. The bearing seal according to claim 3, wherein the bearing seal is slidable or slidable so as to be rotatable in a direction.   The bearing according to any one of claims 1 to 4, wherein the large-diameter ring of the bearing seal is press-fitted into an inner diameter end of a bearing outer ring.   The bearing according to any one of claims 1 to 4, wherein the inner ring portion of the bearing seal is press-fitted into an outer diameter end of the bearing inner ring.   6. A labyrinth comprising: the outer ring according to claim 5 fixed to a bearing housing; and an inner ring portion in which the inner ring portion rotates about an axis via a rolling element with respect to the bearing outer ring or a rotating member integrated with an inner ring. 6. A vehicle bearing device having a bearing according to claim 5, wherein a seal is formed.   A labyrinth comprising: the inner ring according to claim 6 fixed to a fixed shaft, and the large-diameter ring rotating around the shaft via a rolling element with respect to the bearing inner ring or a rotating member integrated with the outer ring. 7. A vehicle bearing device having a bearing according to claim 6, wherein a seal is formed.

Images