JP2014047863A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device which can simply supply lubricant not only to a rotation bearing part but also to straight line bearing part.SOLUTION: A bearing device comprises an inner member 2 to be fitted to a shaft 1 and an outer member 3 to be fitted to the inner member 2. Therein, a first rolling body arrangement part 5 is disposed between the inner member 2 and the outer member 3, a second rolling body arrangement part 6 is disposed between the shaft 1 and the inner member 2, a first oil feed hole 7 for feeding a lubricant to the first rolling body arrangement part 5 is disposed on the outer member 3, a second oil feed hole 8 for feeding lubricant to the second rolling body arrangement part 6 is disposed on the inner member 2, and checking means which is configured such that the lubricant fed from the first oil feed hole 7 is fed to the second rolling body arrangement part 6 when the first oil feed hole 7 and the second oil feed hole 8 are communicated with each other and checks that the first oil feed hole 7 and the second oil feed hole 8 are communicated with each other is provided.

Description

  The present invention relates to a bearing device.

  A compound bearing device (a so-called rotary spline or the like) in which a conventional linear bearing and a rotary bearing are integrally formed on the same axis is a shaft having a spline groove formed therein as disclosed in Patent Document 1, for example. The inner ring member is fitted on the shaft so as to be linearly slidable through a large number of balls, and the outer ring member is fitted on the outer periphery of the inner ring member via a large number of balls.

  By the way, in such a composite bearing device, an oil supply hole for supplying a lubricant (lubricating oil, grease) to a ball between the outer ring member and the inner ring member is usually provided only in the outer ring member, The inner ring member is not provided.

  Accordingly, the lubricant can be supplied from the oil supply hole to the ball (rotation bearing portion) between the outer ring member and the inner ring member, but cannot be supplied to the ball (linear bearing portion) between the inner ring member and the shaft. .

  For example, it is possible to supply the linear bearing part by directly applying the lubricant to the shaft, but it is necessary to supply the lubricant separately to the rotating bearing part and the linear bearing part. It is troublesome.

JP 58-142021 A

  The present invention has been made in view of the current situation as described above, and provides an unprecedented innovative bearing device that can easily supply a lubricant not only to a rotating bearing portion but also to a linear bearing portion. It is.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A bearing device comprising an inner member 2 fitted on a shaft 1 so as to be linearly slidable and an outer member 3 fitted on the inner member 2 so as to be rotatable, the inner member 2 and the outer member 1 is provided with a first rolling element arrangement portion 5 in which a rolling element 4 a is arranged, and a second rolling element 4 b is arranged between the shaft 1 and the inner member 2. The outer member 3 is passed through the outer member 3 through the first rolling element arrangement portion 5 to the first rolling element arrangement portion 5. A first oil supply hole 7 for supplying a lubricant is provided, and the inner member 2 penetrates the inner member 2 through the second rolling element arrangement portion 6 and passes through the second rolling element arrangement portion 6. A second oil supply hole 8 for supplying a lubricant to the installation part 6 is provided, and the first oil supply hole 7 and the second oil supply hole 8 are provided via the first rolling element disposition part 5. Communication state When this happens, the lubricant supplied from the first oil supply hole 7 is supplied to the second rolling element arrangement portion 6, and the first oil supply hole 7 and the second oil supply hole 7 are arranged. The present invention relates to a bearing device characterized by having confirmation means for confirming that the oil supply hole 8 is in communication with the first rolling element arrangement portion 5.

  The bearing device according to claim 1, wherein the confirmation unit is a visual confirmation unit.

  The bearing device according to claim 2, wherein the visual confirmation means includes marks 9 and 10.

  The bearing device according to claim 3, wherein the marks 9 and 10 are provided on the outer member 3 and the shaft 1.

  5. The bearing device according to claim 4, wherein the mark 9 on the outer member 3 side is provided on an axial end surface or a circumferential end surface of the outer member 3. .

  6. The bearing device according to claim 1, wherein the first oil supply hole 7 and the second oil supply hole 8 are substantially straight through the first rolling element disposition portion 5. The bearing is configured so that the lubricant supplied from the first oil supply hole 7 is supplied to the second rolling element arrangement portion 6 when the line is in communication. It concerns the device.

  The bearing device according to any one of claims 1 to 6, wherein the second oil supply hole 8 is set to be larger in diameter than the first oil supply hole 7. Is.

  Further, in the bearing device according to any one of claims 1 to 7, the first rolling element arrangement portion 5 is provided with raceway grooves in which the rolling elements 4a are arranged in double rows, The first oil supply hole 7 is provided in a position where the lubricant is supplied between the raceway grooves.

  Further, in the bearing device according to any one of claims 1 to 8, the second rolling element arrangement portion 6 is provided with raceway grooves in which the rolling elements 4b are arranged in double rows, The second oil supply hole 8 is provided in a position where the lubricant is supplied between the raceway grooves.

  The bearing device according to any one of claims 1 to 9, wherein the inner member 2 and the outer member 3 are an annular inner ring member and an outer ring member, respectively. is there.

  Since the present invention is configured as described above, it becomes an unprecedented and innovative bearing device that can easily supply the lubricant not only to the rotating bearing portion but also to the linear bearing portion.

It is a schematic explanatory perspective view of a present Example. It is a schematic explanatory longitudinal cross-sectional view of a present Example. BRIEF DESCRIPTION OF THE DRAWINGS FIG. It is a schematic explanatory cross-sectional view of another example.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  By linearly sliding the inner member 2 with respect to the shaft 1 and rotating the inner member 2 with respect to the outer member 3, linear motion and rotational motion are guided.

  Here, when supplying the lubricant to the rolling elements 4a and 4b (refueling), the inner member 2 is rotated while confirming the confirmation means (for example, the marks 9 and 10 which are confirmation means by visual recognition). When the oil supply hole 7 and the second oil supply hole 8 are communicated and the lubricant is injected from the first oil supply hole 7, the lubricant is lubricated to the rolling element 4 a of the first rolling element disposing portion 5 through the first oil supply hole 7. Of course, the lubricant is supplied from the first rolling element arrangement portion 5 to the second oil supply hole 8 through the second oil supply hole 8, and the second rolling element arrangement portion 6 of the second rolling element arrangement portion 6 is supplied. A lubricant is also supplied to the rolling elements 4b.

  That is, if the first oil supply hole 7 and the second oil supply hole 8 do not communicate with each other and are in a shifted position, the flow resistance is large, and even if the lubricant is filled from the first oil supply hole 7, the second oil supply The lubricant does not enter the hole 8 and the lubricant is not supplied to the rolling element 4b of the second rolling element arrangement portion 6, but the first oil supply hole 7 and the second oil supply hole 8 communicate with each other. Thus, the flow resistance is reduced accordingly, and the lubricant supplied from the first oil supply hole 7 is satisfactorily supplied to the rolling elements 4 b of the second rolling element arrangement portion 6.

  Further, although the position of the second oil supply hole 8 cannot be confirmed, the position of the inner member 2 is appropriately adjusted by using a confirmation means (for example, marks 9 and 10 which are confirmation means by visual recognition), thereby ensuring the first The oil supply hole 7 and the second oil supply hole 8 can be communicated with each other.

  Therefore, according to the present invention, the lubricant can be easily supplied to the rolling elements 4b (linear bearing portions) of the second rolling element arrangement portion 6, and the first rolling element arrangement portion 5 and the second rolling element arrangement portion 5 can be supplied. Lubricant can be simultaneously supplied to the rolling elements 4a and 4b of the moving body disposing unit 6, and further, it is not necessary to apply the lubricant directly to the shaft. It becomes a simple bearing device.

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

  The present embodiment is a bearing device comprising an inner member 2 fitted on a shaft 1 so as to be linearly slidable and an outer member 3 fitted on the inner member 2 so as to be rotatable. 2 and the outer member 3 are provided with a first rolling element arrangement portion 5 in which a rolling element 4 a is arranged, and a rolling element 4 b is arranged between the shaft 1 and the inner member 2. A second rolling element arrangement portion 6 is provided, and the outer member 3 passes through the inside and outside of the outer member 3 via the first rolling element arrangement portion 5, and the first rolling element is provided. A first oil supply hole 7 for supplying a lubricant to the disposition portion 5 is provided, and the inner member 2 penetrates the inside and outside of the inner member 2 via the second rolling element disposition portion 6 and A second oil supply hole 8 for supplying a lubricant to the second rolling element arrangement portion 6 is provided, and further, the first oil supply hole 7 and the second oil supply hole 8 are arranged in the first rolling element arrangement. Via the installation part 5 When the communication state is established, the lubricant supplied from the first oil supply hole 7 is supplied to the second rolling element arrangement portion 6. Confirmation means for confirming that the second oil supply hole 8 is in communication with the first rolling element disposition portion 5 is provided.

  Specifically, in this embodiment, as shown in FIGS. 1 and 2, a linear bearing (ball spline) and a rotating bearing (double-row angular bearing with a contact angle) are integrated on the same axis. In the constituted rotary spline, the inner member 2 is provided with a second oil supply hole 8 which is not exposed to the outside and communicates with the first oil supply hole 7, so that it can be easily applied not only to the rotation bearing part but also to the linear bearing part. A lubricant (grease) can be supplied.

  Each part will be specifically described.

  The shaft 1 is made of metal, and a pair of upper and lower rolling element arrangement grooves 11 (spline grooves) are provided on the surface thereof on both the left and right sides.

  The inner member 2 is an annular inner ring member made of metal, and a rolling element cage 12 made of resin is disposed on the inner peripheral surface of the inner member 2. As shown in FIG. 3, the rolling element retainer 12 is formed with a rolling element infinite circulation path composed of a load path 13, a no-load path 14, and a return path, between the shaft 1 and the inner member 2. The rolling elements 4b (steel balls) are held (second rolling element arrangement portion 6). The rolling elements 4b held in the load path 13 are arranged in the rolling element arrangement grooves 11. In this embodiment, the rolling element holder 12 is provided with four rolling element infinite circulation paths corresponding to the rolling element arrangement grooves 11.

  Note that a locking portion 16 is provided on the outer peripheral surface of the rolling element cage 12 to be engaged with the uneven portion 15 on the inner peripheral surface of the inner member 2, and is integrally connected and fixed to the inner member 2. In addition, the rolling element holder 12 may adopt a cylindrical integrated type, or may adopt a configuration in which a plurality of divided bodies are combined.

  A pair of inner load grooves 17 are formed on the outer peripheral surface of the inner member 2 along the circumferential direction.

  A pair of outer load grooves 18 are formed on the inner peripheral surface of the metal outer ring 3 (outer ring member) so as to face the pair of inner load grooves 17 on the outer peripheral surface of the inner member 2. The rolling element 4a is held by the inner load groove 17 and the outer load groove 18 (first rolling element arrangement portion 5). In the figure, reference numeral 19 is a rolling element cage, 20 is a seal member, 21 and 22 are flange portions in which mounting holes to which appropriate members are attached are formed, and 23 is a linear bearing portion seal. The inner member 2 and the outer member 3 may be non-continuous circular annular (substantially C-shaped).

  The load path 13 and the load grooves 17 and 18 are track grooves described later.

  The external member 3 is provided with a first oil supply hole 7 having a straight circular hole shape so as to open near the center position between the outer load grooves 18.

  In addition, the inner member 2 is opened in the vicinity of the center position between the adjacent no-load passages 14 and is in a straight round hole-like second oil supply so as to be substantially in line with the first oil supply hole 7. A hole 8 is provided.

  That is, in the present embodiment, the first oil supply hole 7 and the second oil supply hole 8 are provided so that their axial positions are as close as possible (match), and further, the tracks provided in double rows. It is provided at a position for supplying the lubricant between the grooves.

  Therefore, the first oil supply hole 7 and the second oil supply hole 8 can be surely communicated in a substantially straight line (via the first rolling element disposing portion 5), and both sides of the hole can be connected. It is possible to lubricate the track grooves at the same time.

  Further, in the present embodiment, the first oil supply hole 7 and the second oil supply hole 8 are provided at two positions at intervals of 180 °. The second oil supply hole 8 is set to have a diameter larger than that of the first oil supply hole 7 so that the lubricant can easily enter.

  Further, the shaft 1 and the outer member 3 have marks (a mark for assuring that the first oil supply hole 7 and the second oil supply hole 8 are in communication) 9 and 10 as visual confirmation means. Is provided. In this embodiment, as shown in FIG. 1, the marks 9 and 10 are provided at positions shifted by 90 ° from the first oil supply hole 7. It should be noted that the first oil supply hole 7 and the second oil supply hole 8 are not limited to the marks 9 and 10 and are confirmed to be in communication with each other via the first rolling element arrangement portion 5 by sound or light. A confirmation means may be adopted.

  Further, in the present embodiment, the display portion made of an arrow or a character provided on the outer member 3 and the rolling element arrangement groove 11 of the shaft 1 are marked 9 and 10. Specifically, the first oil supply hole 7 and the second oil supply hole 8 are in communication with each other by matching the pair of upper and lower rolling element arrangement grooves 11 with the pair of arrows on the display unit provided in the outer member 3. The positions of the oil supply holes 7 and 8 and the display part (arrow) are set so that

  Moreover, the display part of the outer member 3 is provided in the axial direction end surface and the circumferential direction end surface of the outer member 3, respectively.

  Moreover, the display part of the outer member 3 is provided in two places at 180 degree intervals for the axis line. Therefore, after one display portion is aligned with the predetermined rolling element arrangement groove 11 and supplied from the first oil supply hole 7, the inner member 2 (and the shaft 1) is rotated by 180 ° so that the other display portion is By supplying oil from the other first oil supply hole 7 in accordance with the same rolling element arrangement groove 11, it is possible to supply oil evenly throughout.

  In the present embodiment, the second oil supply hole 8 is provided so as to open in the vicinity of the center position between the adjacent no-load passages 14, but as in the other example shown in FIG. The rolling element holder 12 and the inner member 2 may be configured so as to be provided in the vicinity of the center position between 13. In another example, a receiving recess 24 for receiving the lubricant is provided at a position facing the opening of the second oil supply hole 8. In the case of this other example, the first oil supply hole 7 is provided in the same phase as the marks 9 and 10.

  Since the present embodiment is configured as described above, the inner member 2 is rotated while visually confirming the marks 9 and 10 so that the first oil supply hole 7 and the second oil supply hole 8 communicate with each other. In a state where the hole 7 and the second oil supply hole 8 are communicated with each other, the lubricant is injected into the rolling element 4b of the second rolling element disposing portion 6 by injecting the lubricant from the first oil supply hole 7. It becomes possible to supply (oil supply).

  Therefore, this embodiment is an unprecedented breakthrough in which the lubricant can be easily supplied not only to the rotating bearing portion but also to the linear bearing portion.

DESCRIPTION OF SYMBOLS 1 Axis 2 Inner member 3 External material 4a * 4b Rolling body 5 1st rolling body arrangement | positioning part 6 2nd rolling element arrangement | positioning part 7 1st oil supply hole 8 2nd oil supply hole 9.10 mark

Claims (10)

  A bearing device comprising an inner member that is fitted on a shaft so as to be linearly slidable and an outer member that is fitted on the inner member so as to be freely rotatable, between the inner member and the outer member A first rolling element arrangement portion is provided in which a rolling element is provided, and a second rolling element arrangement portion in which a rolling element is provided is provided between the shaft and the inner member. The external member is provided with a first oil supply hole that penetrates the inside and outside of the outer member through the first rolling element arrangement portion and supplies lubricant to the first rolling element arrangement portion. The material is provided with a second oil supply hole that penetrates the inside and outside of the inner member through the second rolling element arrangement portion and supplies a lubricant to the second rolling element arrangement portion. When the first oil supply hole and the second oil supply hole are in communication with each other via the first rolling element arrangement portion, the lubricant supplied from the first oil supply hole is It is configured to be supplied to the second rolling element arrangement portion, and the first oil supply hole and the second oil supply hole are in communication with each other via the first rolling element arrangement portion. A bearing device characterized by having confirmation means for confirming.   The bearing device according to claim 1, wherein the confirmation unit is a visual confirmation unit.   3. The bearing device according to claim 2, wherein the visual confirmation means is a mark.   4. The bearing device according to claim 3, wherein the mark is provided on the outer member and the shaft.   5. The bearing device according to claim 4, wherein the mark on the outer member side is provided on an axial end surface or a circumferential end surface of the outer member.   The bearing device according to any one of claims 1 to 5, wherein the first oil supply hole and the second oil supply hole communicate with each other substantially in a straight line via the first rolling element disposition portion. When this happens, the lubricant supplied from the first oil supply hole is configured to be supplied to the second rolling element arrangement portion.   The bearing device according to claim 1, wherein the second oil supply hole is set larger in diameter than the first oil supply hole.   8. The bearing device according to claim 1, wherein a raceway groove in which the rolling elements are disposed is provided in a double row in the first rolling element disposition portion, and the first lubrication is performed. A hole is provided at a position where the lubricant is supplied between the raceway grooves.   9. The bearing device according to claim 1, wherein a raceway groove in which the rolling elements are arranged is provided in a double row in the second rolling element arrangement portion, and the second oil supply is provided. A hole is provided at a position where the lubricant is supplied between the raceway grooves.   The bearing device according to claim 1, wherein the inner member and the outer member are an annular inner ring member and an outer ring member, respectively.

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