JP2009270618A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device which enables installation of electric wiring to electronic components arranged inside without reducing bearing stiffness, and is easily assembled. <P>SOLUTION: This bearing device is constructed by interposing outer ring spacers and inner ring spacers between outer rings and between inner rings of a plurality of roller bearings which are supported within a housing and arranged in axial direction. Furthermore, an outer ring space 7 is provided with at least one electronic component 11 and an electric connection component 14 connected to the electronic component 11. Additionally, a radially penetrating rod insertion hole 15 is arranged at an axial location of a housing 1 corresponding to the electric connection component 14, and a rod 16 connected to the electric connection component 14 is arranged in such an attaching state that it is inserted into the rod insertion hole 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bearing device used for a spindle of a machine tool.

In spindle devices of machine tools, bearing preload management is required to improve machining accuracy and efficiency. In addition, there is also a demand to prevent the occurrence of a bearing abnormality by detecting a sign before the abnormality occurs in the bearing. In order to detect the abnormality of the bearing, there is one in which a temperature sensor or a vibration sensor is installed in a housing or a spacer (Patent Document 1). These sensors detect bearing abnormalities such as a rapid temperature rise caused by a lack of lubricant.
JP 2004-169756 A

  In the above-described patent document, the bearing ring temperature and vibration are measured for detecting the bearing abnormality, but there are cases where the bearing abnormality cannot be detected accurately and quickly only by measuring these two. For example, when detecting an abnormality by measuring the temperature of the bearing raceway, the temperature of the raceway may suddenly rise immediately before an abnormality such as seizure, so the state before the bearing anomaly is detected at an appropriate timing. There are things that cannot be done.

Therefore, as a bearing device that can accurately predict a bearing abnormality at an appropriate timing and can cope with preload management of the bearing, for example, a configuration shown in FIG. 4 is conceivable.
In this bearing device, a main shaft 32 is rotatably supported on a housing 31 by a plurality of rolling bearings 33. The rolling bearing 33 is fitted to the main shaft 32 in an interference fit state, and an inner ring spacer 36 and an outer ring spacer 37 are interposed between the inner rings 33i and 33i and the outer rings 33g and 33g of the rolling bearing 33. The dimensions of the inner ring spacer 36 and the outer ring spacer 37 are adjusted so that an appropriate preload is applied to the rolling bearing 33, and the inner ring fixing that abuts the inner ring end face of one of the rolling bearings 33 via the spacer 51. By tightening the nut 52, a preload is applied to the rolling bearing 33. The outer ring spacer 37 is provided with a sensor unit 40 that includes a preload sensor that detects a preload and a temperature sensor and / or a vibration sensor. The electrical wiring 48 used for supplying power to the sensor unit 40 and transmitting the detection signals of the sensors to the outside includes a groove 31 a provided on the inner peripheral surface of the housing 31 and an outer ring 33 g of one rolling bearing 33. It is pulled out to the outside through a hole 41a provided in the pressing lid 41 pressed against the end surface.

  According to this configuration, the preload sensor of the sensor unit 40 provided in the outer ring spacer 37 can detect the preload, and the temperature sensor and the vibration sensor can detect the temperature and vibration. It can also be used for bearing preload management.

  However, in this case, since the groove 31a is provided on the inner peripheral surface of the housing 31 and the electric wiring 48 is passed through, there is a problem that the bearing rigidity is lowered due to the groove 31a and the rotation accuracy is deteriorated.

  An object of the present invention is to provide a bearing device that can perform electrical wiring to an electronic component disposed inside without reducing the bearing rigidity and that can be easily assembled.

  The bearing device according to the present invention is a bearing device in which an outer ring spacer and an inner ring spacer are interposed between outer rings and inner rings of a plurality of rolling bearings supported in a housing and arranged in the axial direction. One or more electronic components and an electrical connection component electrically connected to the electronic component are provided, and a rod insertion hole penetrating in the radial direction is provided at an axial position of the housing corresponding to the electrical connection component. A rod that is electrically connected to the electrical connection component in a mounted state inserted into the insertion hole is provided.

  According to this configuration, it is not necessary to provide a groove for passing electrical wiring on the inner peripheral surface of the housing. For this reason, a decrease in bearing rigidity due to the groove can be avoided. Further, since electrical connection can be performed after the bearing device is assembled, there is no need to consider electric wiring during assembly, and assembly can be easily performed.

  In this invention, the electrical connection component is provided at the tip of the rod, and the electrical connection component is connected to the electrical connection component provided in the outer ring spacer by inserting the rod into the rod insertion hole. It may be a state. In the case of this configuration, it is possible to easily connect the electrical wiring to the electronic component provided in the outer ring spacer.

In this invention, the electrical connection component of the outer ring spacer is a connector plug in which the contact at the tip is arranged radially outward, and the rod is inserted into the rod insertion hole in the plug insertion port. It is good also as what has a connector socket inserted and connected to the said connector plug.
In this way, by using a connector plug as an electrical connection component provided in the outer ring spacer and using a connector socket as an electrical connection component provided in the rod, the connector plug is inserted into the rod insertion hole of the housing. The contact at the tip is inserted into the insertion port of the connector socket, so that both electrical connection components can be reliably connected to each other.

In this invention, the electrical connection component of the outer ring spacer is a connector socket in which the plug insertion port is disposed radially outward, and the rod has a contact at the tip in a mounted state inserted in the rod insertion hole. It is good also as what has a connector plug inserted and connected to the plug insertion port of the said connector socket.
In this way, by using a connector socket as an electrical connection component provided in the outer ring spacer and using a connector plug as an electrical connection component provided in the rod, the connector plug is inserted into the rod insertion hole of the housing. The contact at the tip is inserted into the insertion port of the connector socket, so that both electrical connection components can be reliably connected to each other.

  In the present invention, the electronic component may be various sensors or sensor circuits.

  In the present invention, the various sensors may be at least one of a temperature sensor, a vibration sensor, a spindle rotation detection sensor, and a bearing preload sensor.

  In the present invention, an elastic member may be interposed between the rod insertion hole and the rod. Thus, by interposing the elastic member between the rod insertion hole and the rod, it is possible to prevent the rod from being damaged by vibration of the housing or the like.

  In the present invention, the rod insertion hole may be sealed with a seal member. Thus, by sealing the rod insertion hole with the seal member, it is possible to prevent foreign matter from entering the bearing device from the outside through the rod insertion hole.

  In the present invention, the rod may be connected to an external control device via electric wiring.

The bearing device of the present invention is a bearing device in which an outer ring spacer and an inner ring spacer are interposed between outer rings and inner rings of a plurality of rolling bearings supported in a housing and arranged in the axial direction.
The outer ring spacer is provided with one or more electronic components and an electrical connection component electrically connected to the electronic component, and a rod penetrating in a radial direction at an axial position of the housing corresponding to the electrical connection component An insertion hole is provided, and a rod that is electrically connected to the electrical connection component in the state of being inserted into the rod insertion hole is provided, so that electrical wiring to the electronic component arranged inside is performed without reducing the bearing rigidity. Can be assembled easily.

  An embodiment of the present invention will be described with reference to FIGS. In this bearing device, a shaft 2 is rotatably supported by a plurality of rolling bearings 3 on a housing 1. This bearing device is applied to, for example, a spindle device of a machine tool, and in this case, the shaft 2 is a main shaft of the spindle device.

  A plurality of axially spaced rolling bearings 3 are fitted to the shaft 2 by interference fitting, and an inner ring spacer 6 is interposed between the inner rings 3i and 3i, and an outer ring spacer 7 is interposed between the outer rings 3g and 3g. . The rolling bearing 3 has a rolling element 4 interposed between an inner ring 3i and an outer ring 3g. These rolling elements 4 are held by a cage 5. The rolling bearing 3 is a bearing capable of applying an axial preload, and an angular ball bearing, a deep groove ball bearing, a tapered roller bearing, or the like is used. In the illustrated example, an angular ball bearing is used, and the two rolling bearings 3 and 3 are installed back to back.

  The width dimension of the outer ring spacer 7 is different from the width dimension of the inner ring spacer 6, and by tightening an inner ring fixing nut 22 that abuts the end surface of the inner ring 3 i of one rolling bearing 3 via the spacer 21, these are fixed. Preload is applied to the rolling bearing 3 in accordance with the width dimensions of the outer ring spacer 7 and the inner ring spacer 6.

  The outer ring spacer 7 is provided with one or more electronic components and an electrical connection component 14 that is electrically connected to the electronic components. Specifically, the outer ring spacer 5 includes ring-shaped first and second spacer members 8 and 9 and a sensor unit 10. A sensor unit 10 made of a ring member is sandwiched between a first spacer member 8 provided on one axial side and a second spacer member 9 provided on the other axial side. The sensor unit 10 is provided with, for example, a bearing preload sensor 11 that detects a preload load of the bearing and a circuit board (not shown) having a sensor circuit associated therewith as the electronic component.

  The sensor unit 10 is provided with the electrical connection component 14 in a state of protruding in the axial direction facing the second spacer member 9. In this case, the electrical connection component 14 is attached to, for example, a circuit board (not shown) provided in the sensor unit 10. An accommodation space 9a (FIG. 2) for accommodating the electrical connection component 14 is formed at the end of the second spacer member 9 on the side from which the electrical connection component 14 protrudes. Further, for example, a temperature sensor 12 is provided as another electronic component on one end side of the first spacer member 8 facing the bearing outer ring 3g. Furthermore, for example, a vibration sensor 13 is provided as another electronic component on one end side of the second spacer member 9 facing the bearing outer ring 3g. Each of these sensors 11, 12, 13 is electrically connected to the electrical connection component 14. Here, a connector plug is used as the electrical connection component 14, and the contact at the tip thereof is arranged radially outward. In addition to the bearing preload sensor 11, the temperature sensor 12, and the vibration sensor 13, a spindle rotation sensor may be provided as the electronic component, or at least one of these sensors may be provided.

  The housing 1 is provided with a rod insertion hole 15 penetrating in the radial direction at an axial position corresponding to the installation position of the electrical connection component 14 of the outer ring spacer 7. A rod 16 that is electrically connected to the electrical connection component 14 of the outer ring spacer 7 is inserted into the rod insertion hole 15. The rod 16 is formed by coating a part of the electric wiring 18 in a rod shape with a resin 19 (FIG. 2) and covering the outer ring spacer 7 in the mounted state inserted into the rod insertion hole 15. Electrically connected to the component 14. Specifically, another electrical connection component 17 that is connected to the electrical connection component 14 of the outer ring spacer 7 in the mounted state inserted into the rod insertion hole 15 is provided at the tip facing the inner diameter side of the rod 16. It has been. Here, a connector socket that can be connected to a connector plug that is an electrical connection component 14 of the outer ring spacer 7 is used as an electrical connection component 17 of the rod 14, and its insertion port is connected to the connector plug. The rod 16 may be manufactured by injection molding or the like. The electrical connection component 14 composed of the connector plug and the electrical connection component 17 composed of a connector socket constitute a plug connection type connector 29.

  At the end of the rod 16 facing the outer diameter side, there is provided a flange portion 16a from which the electric wiring 18 is drawn to the outside, and the rod 16 is fixed to the housing 1 by screwing the flange portion 16a to the outer peripheral surface of the housing 1 or the like. 1 is fixed. The electrical wiring 18 drawn out to the outside is connected to the control device 20.

  The operation and effect of the above configuration will be described. In this bearing device, in addition to the temperature sensor 12 and the vibration sensor 13, the bearing preload sensor 11 is provided in the sensor portion 10 of the outer ring spacer 7. Therefore, the initial preload applied to the rolling bearing 3 and the preload increased during operation can be reduced. I can know. Thus, not only temperature and vibration but also the preload applied to the inside of the bearing can be detected to detect the abnormality of the rolling bearing 3, so that the abnormality of the rolling bearing 3 can be accurately predicted with appropriate timing. Can do.

  In particular, in this bearing device, various sensors 9, 10, 11, etc., which are electronic components provided in the outer ring spacer 5, are electrically connected to the external control device 20. The connected electrical connection component 14 is provided in the outer ring spacer 7. A rod insertion hole 15 penetrating in the radial direction is provided at an axial position of the housing 1 corresponding to the electrical connection component 14, and is electrically connected to the electrical connection component 14 in a mounted state inserted into the rod insertion hole 15. The rod 16 is provided. For this reason, it is not necessary to provide a groove for passing the electric wiring 18 on the inner peripheral surface of the housing 1. For this reason, a decrease in bearing rigidity due to the groove can be avoided. Further, since electrical connection can be performed after the bearing device is assembled, there is no need to consider the electrical wiring 18 during assembly, and assembly can be performed easily.

  In this embodiment, the electrical connection component 17 is provided at the tip of the rod 16, and the electrical connection component 17 is provided in the outer ring spacer 7 in a state where the rod 16 is inserted into the rod insertion hole 15 of the housing 1. Since the electrical connection component 14 is in a connected state, the electrical wiring 18 can be easily connected to the various sensors 11, 12, 13, etc., which are electronic components provided in the outer ring spacer 7. .

  Further, since a connector plug is used as the electrical connection component 14 provided in the outer ring spacer 7 and a connector socket is used as the electrical connection component 17 provided at the tip of the rod 16, the rod 16 is inserted into the rod insertion hole 15 of the housing 1. In the inserted state, the contact at the tip of the connector plug is inserted into the insertion port of the connector socket, and the two electrical connection components 14 and 17 can be reliably connected to each other.

  FIG. 3 shows an enlarged cross-sectional view of the main part of another embodiment of the present invention. 1 and 2, this bearing device uses a connector socket as the electrical connection component 14 provided in the outer ring spacer 7 and a connector plug as the electrical connection component 17 provided at the tip of the rod 16. It is. The connector socket used as the electrical connection component 14 is disposed with the plug insertion port facing radially outward. The connector plug used as the electrical connection component 17 is connected in such a state that the rod 16 is inserted into the rod insertion hole 15 of the housing 1 and the contact at the tip thereof is inserted into the plug insertion port of the connector socket. Thereby, also in this embodiment, both the electrical connection components 14 and 17 can be reliably connected to each other.

  In this embodiment, the elastic member 23 is provided between the rod insertion hole 15 and the rod 16 of the housing 1 by providing the elastic member 23 on the outer periphery of the rod 16. Thus, by interposing the elastic member 23 between the rod insertion hole 15 and the rod 16, it is possible to prevent the rod 16 from being damaged by vibration of the housing 1 or the like.

  Further, in this embodiment, a seal member 24 such as an O-ring is provided on the outer peripheral surface of the housing 1 where the rod flange 16a around the opening of the rod insertion hole 15 contacts, and the outer diameter side of the rod insertion hole 15 is provided. The ends are sealed. Thereby, it is possible to prevent foreign matters from entering the bearing device from the outside through the rod insertion hole 15. In particular, in a spindle device of a machine tool or the like, the housing 1 is exposed to cooling water or cutting oil for cooling the outer cylinder, so that these can be prevented from entering the bearing device through the rod insertion hole 15. Other configurations and operational effects are the same as those of the embodiment shown in FIGS. 1 and 2.

  In each of the above embodiments, the electrical connection component 14 provided on the outer ring spacer 7 is a connector plug or connector socket, and the electrical connection component 17 provided on the rod 16 is a connector socket or connector plug. The electrical connection parts 14 and 17 are not limited to connectors that are inserted and connected to each other, and other parts can also be used. For example, even if electrodes that simply contact each other are used as the both electrical connection parts 14 and 17, both electrical connection parts 14 and 17 can be easily connected with the rod 16 inserted into the rod insertion hole 15 of the housing 1. Can be.

It is sectional drawing of the bearing apparatus concerning one Embodiment of this invention. It is a principal part expanded sectional view of the bearing apparatus. It is a principal part expanded sectional view of the bearing apparatus concerning other embodiment of this invention. It is sectional drawing of a proposal example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Housing 3 ... Rolling bearing 3i ... Inner ring 3g ... Outer ring 6 ... Inner ring spacer 7 ... Outer ring spacer 11 ... Bearing preload sensor (electronic component)
12 ... Temperature sensor (electronic component)
13. Vibration sensor (electronic component)
DESCRIPTION OF SYMBOLS 14 ... Electrical connection component 15 ... Rod insertion hole 16 ... Rod 17 ... Electrical connection component 18 ... Electrical wiring 20 ... Control apparatus 23 ... Elastic member 24 ... Seal member

Claims (9)

In a bearing device in which an outer ring spacer and an inner ring spacer are interposed between outer rings and inner rings of a plurality of rolling bearings supported in a housing and arranged in the axial direction,
The outer ring spacer is provided with one or more electronic components and an electrical connection component electrically connected to the electronic component, and a rod penetrating in a radial direction at an axial position of the housing corresponding to the electrical connection component A bearing device comprising an insertion hole and a rod that is electrically connected to the electrical connection component in a mounted state inserted into the rod insertion hole.   The electrical connection component according to claim 1, wherein the electrical connection component is provided at a tip of the rod, and the electrical connection component includes an electrical connection component provided in the outer ring spacer by inserting the rod into the rod insertion hole. A bearing device that is in a connected state.   The electrical connection component of the outer ring spacer according to claim 1 or 2, wherein the electrical connection component of the outer ring spacer is a connector plug in which a contact at a distal end is arranged radially outward, and the rod is inserted into the rod insertion hole. A bearing device having a connector socket in which a plug insertion port is connected to the connector plug.   In Claim 1 or Claim 2, the electrical connection component of the outer ring spacer is a connector socket in which a plug insertion port is disposed radially outward, and the rod is inserted in the rod insertion hole. A bearing device having a connector plug in which a contact at a tip is connected to a plug insertion port of the connector socket.   5. The bearing device according to claim 1, wherein the electronic component is a sensor or a sensor circuit.   6. The bearing device according to claim 5, wherein the sensor is at least one of a temperature sensor, a vibration sensor, a spindle rotation detection sensor, and a bearing preload sensor.   7. The bearing device according to claim 1, wherein an elastic member is interposed between the rod insertion hole and the rod.   8. The bearing device according to claim 1, wherein the rod insertion hole is sealed with a seal member.   9. The bearing device according to claim 1, wherein the rod is connected to an external control device via an electric wiring.

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