JP6521838B2 - Support structure of rotating shaft - Google Patents

Description

  The present invention relates to a support structure of a rotating shaft that rotatably supports a rotating shaft via a liquid.

  As a bearing that rotatably supports the rotation shaft, there is a fluid bearing in which the rotation shaft is supported by a support member via a fluid. Since fluid bearings intervene between the rotating shaft and the support member during rotation and become noncontact during rotation, fluid bearings are used in various bearing parts as having extremely low frictional resistance and capable of suppressing rotational loss. . The support portion of the fluid bearing is formed with a supply portion for supplying fluid from the outside between the rotation shaft and the support member, and a recovery portion for collecting the fluid supplied between the rotation shaft and the support member It is done. In addition, a seal member is provided to seal the fluid supplied to the recovery unit in order to prevent a large amount of fluid from flowing out from the portion other than the recovery unit after the fluid is supplied and recovered. ing. As an example of the seal member, Patent Document 1 discloses an example in which a rotating disk fixed to a rotating shaft and rotating with the rotating shaft in a groove constituting a recovery unit is provided.

JP, 2011-247837, A

  However, in the case of a fluid bearing using a liquid as a fluid, when the above-mentioned rotating disc is used as a seal member, the liquid that has flowed to the disc moves to the outer peripheral portion of the disc by centrifugal force and then to the periphery. The scattering causes a problem that the liquid can not be recovered efficiently. In addition, when the pressure of the supplied liquid is increased, the fluid is spouted from the gap between the side end of the support member and the rotating shaft to the outside through the space between the peripheral portion of the disc and the support member. In some cases, the liquid recovery efficiency is further reduced. For this reason, it is also considered to form a labyrinth by providing a plurality of recovery grooves and a rotating disc in the support member to prevent the ejection of fluid from between the support member and the rotation shaft. In this case, there is a problem that the support member is elongated and the support structure is enlarged.

  The present invention has been made to solve the above problems, and in a support structure of a rotating shaft that rotatably supports a rotating shaft via a liquid, the liquid supplied between the rotating shaft and the support member is supported It is an object of the present invention to provide a support structure for a rotary shaft which can be efficiently recovered to an outlet provided to a member and which can be made compact.

  In order to achieve the above object, the present invention is a support structure for a rotary shaft that rotatably supports a rotary shaft, comprising a support member having an insertion portion through which the rotary shaft is rotatably inserted, the support member being a support member A collection groove is formed with a discharge port for discharging the liquid supplied between the inner peripheral surface of the insertion portion and the outer peripheral surface of the rotation shaft to the outside of the insertion portion, and rotates with the rotation shaft A rotating body is disposed at a predetermined distance between a first side and a second side forming the recovery groove, and the rotating body is positioned upstream of the liquid supply direction in the insertion portion. A guide portion for guiding the liquid discharged from the insertion portion toward the first side surface is formed on the surface opposite to the first side surface.

  According to the present invention, in the support structure of the rotary shaft rotatably supporting the rotary shaft through the liquid, the liquid supplied between the rotary shaft and the support member is discharged to the discharge port provided in the support member. It becomes possible to collect efficiently. In addition, it is not necessary to provide a plurality of recovery grooves and rotating bodies in the support member, and the structure can be made compact.

It is a vertical side view which shows the support structure of the rotating shaft in embodiment.

  One embodiment of a support structure of a rotating shaft according to the present invention will be described in detail with reference to FIG.

  The support structure of the rotating shaft in the present embodiment is applicable to all of fluid bearings that rotatably support the rotating shaft with low friction, and can be used for various devices. For example, the support structure of the rotation shaft in the present embodiment is suitable for supporting the rotation shaft of a device requiring high accuracy and low loss, such as a bearing in a gear loss measurement device for gears by power circulation type. .

  As shown in FIG. 1, the support structure 1 for the rotation shaft in the present embodiment has a support member 2 in which an insertion hole 20 (insertion portion) is formed inside, and a rotation shaft 3 inserted in the insertion hole 20. . The supporting member 2 is formed with a liquid supply portion for supplying a liquid such as oil to the gap g between the rotary shaft 3 inserted into the insertion hole 20 and the inner peripheral surface 20 a of the insertion hole 20. There is. The liquid supply portion is formed by a through hole (hereinafter referred to as a supply port) formed to penetrate the wall 2 a of the support member 2. The formation position and the number of the supply ports 22 can be set variously, and may be single or plural. In the present embodiment, four supply ports 22 are formed at angular intervals of 90 degrees in the circumferential direction around the central axis L. The liquid stored in a liquid storage unit (not shown) is pressurized and supplied by a pump to each supply port 22, and the supplied liquid intrudes into the gap g.

  Further, in the support member 2, an annular recovery groove 21 for recovering the liquid 30 supplied between the support member 2 and the rotary shaft 3 is formed. The recovery groove 21 has a first side surface 21a located on the upstream side in the supply direction (X direction) of the liquid supplied from the supply port 22, a second side surface 21b opposite to the first side surface 21a, and It is formed of a bottom 21c connecting the first side 21a and the outer end of the second side 21b. The recovery groove 21 is formed with a discharge port 21d for discharging the liquid 30 flowing into the recovery groove 21 to the outside, and the liquid 30 discharged from the discharge port 21d is disposed below the discharge port 21d. The liquid is recovered to the liquid storage unit through the illustrated crucible or the like.

  The rotating shaft 3 is provided with a rotating plate 40 as a rotating body that rotates with the rotating shaft 3. The rotary plate 40 may be fixed by fastening, welding, screwing or the like a member separate from the rotary shaft 3, but may be integrally formed with the rotary shaft. The rotary plate 40 has an annular shape, and a portion of the rotary plate 40 is disposed in the recovery groove 21 in a noncontact manner. That is, the first opposing surface 41 of the rotating plate 40 is on the first side 21 a of the recovery groove 21, and the second opposing surface 42 of the rotating plate 40 is on the second side 21 b of the recovery groove 21. The peripheral portion faces the bottom surface 21 c of the recovery groove 21 via a predetermined interval.

  The first opposed surface 41 of the rotary plate 40 facing the first side surface 21 a of the recovery groove 21 is supplied from the supply port 22, and between the outer peripheral surface of the rotary shaft 3 and the inner peripheral surface 20 a of the insertion hole 20. A guide surface 41A is formed as a guide for guiding the liquid 30 that has reached the first opposing surface 41 of the rotating body 40 toward the first side surface 21a of the recovery groove 21. The guide surface 41A, as shown in FIG. 1, has a curved surface portion curved so as to approach the first side surface 21a of the recovery groove 21 as it goes from the rotation center of the rotary plate 40 (the rotation center of the rotation axis) to the outer peripheral edge. Have. Therefore, the facing distance between the first side surface 21 a of the recovery groove 21 and the first opposing surface 41 of the rotary plate 40 is minimum at the outer peripheral edge 41 B of the first opposing surface 41 of the rotary plate 40. Although FIG. 1 shows the recovery groove 21 and the rotary plate 40 provided on one end side of the rotary shaft 3, that is, on the right side of the supply port 22, the recovery groove and the rotary body are also on the left side of the supply port. A supply port 22 is provided between the two recovery grooves.

Next, based on the above configuration, the operation of the present embodiment will be described.
The liquid stored in the liquid supply source is pumped by the pump to the supply port 22 of the support member 2. Thereby, the liquid is pressurized and supplied to the gap g between the inner peripheral surface 20a of the insertion hole 20 formed in the support member 2 and the outer peripheral surface of the rotary shaft 3 so that the rotary shaft 3 and the support member 2 do not contact. Keep it For this reason, the friction loss which arises at the time of rotation of axis of rotation 3 is held down to a very low value compared with other bearings with which axis of rotation and a support member contact.

  Further, the liquid 30 supplied to the gap g flows to the recovery groove 21 formed in the support member 2, and is a rotary plate disposed between the first side surface 21 a and the second side surface 21 b of the recovery groove 21. The first facing surface 41 of 40 is contacted. The liquid 30 moves toward the outer peripheral edge 41B by centrifugal force, but faces in the direction of arrow E along the curved surface shape of the guide surface 41A, contacts the first side surface 21a, and flows down along the first side surface 21a .

  As described above, in the present embodiment, since the liquid and droplets guided to the guide surface 41A of the rotary plate 40 can be made to flow down along the first side surface 21a, it is ensured to the collection portion disposed below. Liquid can be collected. For this reason, it is possible to prevent leakage and scattering of the liquid to a place other than the recovery part, and it is possible to suppress the fouling around the liquid due to the liquid.

  Furthermore, the recovery groove and the rotary plate for receiving the liquid supplied from the supply port may be provided at one place in the liquid supply direction, and the size of the bearing structure in the axial direction of the rotary shaft can be compact and inexpensive. it can.

(Other embodiments)
In the embodiment described above, an example is shown in which a guiding surface having a curved portion curved so as to approach the first side surface 21a of the recovery groove 21 in a cross section passing through the rotation axis is provided as the guiding portion formed on the rotating body. However, the guide portion formed on the rotating body is not limited to one having a curved surface portion in a cross section passing through the rotation axis. For example, the guide may be formed in a frusto-conical surface that approaches the first side of the recovery groove in a section passing through its axis of rotation. Further, the guide portion does not necessarily extend to the outer peripheral edge of the rotating body, and is formed on a part of the opposing surface to the first side surface and not continuous to the surface extending to the outer peripheral edge of the rotating body It may be Furthermore, the guide portion formed on the rotating body is not limited to one continuously formed in the rotational direction, but may be intermittently or partially formed in the rotational direction.

  Although the case where a rotary body was comprised by the annular-shaped rotary plate was taken and demonstrated to the example, it is also possible to comprise a rotary plate by the member which has a polygon and other shapes. Further, although the rotary plate shown in FIG. 1 has a shape in which a cylindrical surface is formed at the end edge, it may be formed in a sharp shape without forming a cylindrical surface at the end edge portion. Further, a guide surface may be formed on the second opposing surface 42 of the rotary plate 40 to guide the liquid to the second side surface 21 b of the recovery groove 21. According to this, it becomes possible to guide even the slight liquid which has come around to the second opposing surface 42 side to the second side surface 21b of the recovery groove 21, and it is possible to recover the liquid more reliably. Become.

1 Support structure for rotating shaft 2 Support member 3 Rotating shaft 20 Insertion hole (insertion portion)
20a Inner circumferential surface 21 Collection groove 21a First side 21b Second side 21d Discharge port 22 Supply port 30 Liquid 40 Rotator 41A Guide surface (guide portion)
41 First facing surface (facing surface)

Claims (1)

A support structure of a rotating shaft rotatably supporting the rotating shaft through a liquid ,
A support member having an insertion portion through which the rotation shaft is rotatably inserted,
The support member is formed of a first side surface and a second side surface facing apart in the supply direction of the liquid supplied between the inner peripheral surface of the insertion portion and the outer peripheral surface of the rotating shaft . It has a recovery groove formed with a discharge port for discharging the liquid to the outside of the insertion part ,
The rotating body that rotates together with the rotating shaft is arranged with a predetermined distance between said second side and said first side surface to the collecting groove,
The rotating body approaches the first side surface from the rotation center of the rotation shaft toward the outer peripheral edge on the surface facing the first side surface located on the upstream side in the liquid supply direction in the insertion portion. the support structure of the rotary shaft has a curved curved portion, wherein the guide portion is formed of a liquid discharged from said insertion portion for guiding towards the first side said to.

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