JP2015172417A - Rotary device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary device capable of preventing the release of a preload by moment.SOLUTION: The rotary device comprises: a housing 11; an annular outer ring 41 fitted into an inner circumference of the housing 11; a first inner ring 50 and a second inner ring 60 disposed on an inner circumference of the outer ring 41; a connecting bolt 83 connecting the first inner ring 50 to the second inner ring 60; a rotation member 20 that includes a flange portion 22 extending radially and a cylindrical portion extending axially; and an attachment bolt 81 attaching the rotation member 20 in a state of contacting the flange portion with the first inner ring 50, a first insertion hole 24 being axially formed in the flange portion 22, a second insertion hole 52 being axially formed in the first inner ring 50, a screw hole 62 being formed in the second inner ring 60, and the attachment bolt 81 being inserted into the first insertion hole 24 and the second insertion hole 52 to screw the attachment bolt 81 with the screw hole 62 in a state of contacting the flange portion 22 with the first ring 50.

Description

  The present invention relates to a rotating device.

  One medical device is a CT scanner device. In this device, a rotating member is rotatably supported around a horizontal axis via a rolling bearing with respect to a housing installed on the floor. An X-ray tube device that generates X-rays on the rotating member and a detection device that detects X-rays are attached.

  As a rolling bearing, for example, there is one as shown in Patent Document 1, and on the inner periphery of the outer ring, the first inner ring and the second inner ring are arranged adjacent to each other in the axial direction, and the first inner ring and the second inner ring are connected by a connecting bolt. Linked in the direction.

JP 2006-266458 A

  In CT scanner devices, there are a wide variety of attachment structures for rotating members to rolling bearings. When the rotating member has a flange portion extending in the outer diameter direction and a cylindrical portion extending in the axial direction with respect to the flange portion, the flange portion is in contact with the end surface of the first inner ring opposite to the second inner ring. There is an attachment structure for attaching the rotating member to the first inner ring by inserting the attachment bolt into the first insertion hole of the flange portion and screwing the attachment bolt into the screw hole of the first inner ring. In this case, since the rotating member overhangs in the axial direction with respect to the first inner ring, a moment due to the weight of the rotating member, the X-ray tube device and the detecting device acts on the rolling bearing. Since the moment particularly acts on the first inner ring, the first inner ring is deformed in a direction away from the second inner ring on the upper side, the preload is released, and abnormal noise is likely to occur when the rotating member is rotated. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotating device in which a preload is not released by a moment.

  According to a first aspect of the present invention, a housing having a cylindrical inner periphery, an annular outer ring fitted to the inner periphery of the housing, an annular first inner ring disposed on the inner peripheral side of the outer ring, and the outer ring A second inner ring disposed on the inner peripheral side and disposed adjacent to the first inner ring in the axial direction; a plurality of first rolling elements disposed in a circumferential direction between the outer ring and the first inner ring; A plurality of circumferentially arranged second rolling elements between the outer ring and the second inner ring; a connecting bolt for connecting the first inner ring and the second inner ring in the axial direction; and a flange portion extending in the radial direction. A rotating member that has a cylindrical portion extending in the axial direction with respect to the flange portion, and is attached in a state where the flange portion is in contact with an end surface of the first inner ring opposite to the second inner ring; and the rotating member is attached. In rotating devices with mounting bolts, A first insertion hole through which the mounting bolt is inserted in the axial direction is formed in the flange portion, and a second insertion hole through which the mounting bolt is inserted in the axial direction at a position corresponding to the first insertion hole is formed in the first inner ring. Then, a screw hole into which the mounting bolt is screwed is formed in the second inner ring at a position corresponding to the second insertion hole, and the flange portion is in contact with the end surface of the first inner ring opposite to the second inner ring. In this state, the rotating bolt is inserted into the first inner ring and the second inner ring by inserting the mounting bolt into the first insertion hole and the second insertion hole and screwing the mounting bolt into the screw hole. It is characterized by being attached.

  According to the above-described configuration, the mounting bolt is attached to the second inner ring via the first inner ring. Therefore, the first inner ring and the second inner ring are deformed in the same direction due to the moment, and the second inner ring is deformed. Since the first inner ring does not leave, a rotating device in which the preload is not released by the moment can be provided.

It is a longitudinal cross-sectional view of the rotating apparatus concerning one Embodiment of this invention. It is sectional drawing containing the 2nd attachment bolt of the rotating apparatus concerning one Embodiment of this invention. It is sectional drawing containing the connection bolt of the rotating apparatus concerning one Embodiment of this invention. It is the sectional view on the AA line of FIG. 1 concerning one Embodiment of this invention.

  A rotating device 10 according to an embodiment of the present invention will be described with reference to FIG. The rotating device 10 includes a housing 11 having a cylindrical inner periphery, a ball bearing 40 fitted to the inner periphery of the housing 11, and a first state in contact with the end surface 51 of the first inner ring 50 of the ball bearing 40. The first rotating member 20 attached via the attaching bolt 81 and the second rotating member 30 attached via the second attaching bolt 82 in a state in contact with the end surface 61 of the second inner ring 60 of the ball bearing 40 are provided. Yes.

  The rotating device 10 is one device of a CT scanner device that is one of medical devices. This supports the 1st rotation member 20 through the ball bearing 40 with respect to the housing 11 installed in the floor so that rotation around a horizontal axis line is possible. An unillustrated X-ray tube device for generating X-rays on the first rotating member 20 and an unillustrated detection device for detecting X-rays are attached. A belt (not shown) is hung on the second rotating member 30, and the rotational power of the electric motor (not shown) is transmitted to the second rotating member 30 via the belt.

  The housing 11 is installed on the floor surface, extends upward with respect to the floor surface, and has a cylindrical inner periphery 12 and a step surface 13 extending in the inner diameter direction with respect to the inner periphery 12 in the middle of the upward direction. The axis of the inner periphery 12 is horizontal, and the step surface 13 has a surface perpendicular to the axis.

  The ball bearing 40 is a two-row type in which two inner rings 50 and 60 are arranged on one outer ring 41. The ball bearing 40 has two contact angles inclined with respect to the vertical axis. One is the contact angle on the first inner ring 50 side, and the other is the contact angle on the second inner ring 60 side. The contact angle on the first inner ring 50 side is the angle inclined clockwise in FIG. 1 with respect to the vertical axis at the top, and the contact angle on the second inner ring 60 side is the opposite of that in FIG. It is an angle inclined clockwise. The ball bearing 40 can receive a radial load, a thrust load, and a moment.

  As shown in FIG. 3, the ball bearing 40 includes an annular outer ring 41 fitted to the inner circumference 12 of the housing 11, an annular first inner ring 50 disposed on the inner circumferential side of the outer ring 41, and the outer ring 41. A second inner ring 60 arranged on the inner peripheral side and arranged adjacent to the first inner ring 50 in the axial direction; and a plurality of first balls 70 arranged in the circumferential direction between the outer ring 41 and the first inner ring 50; The first balls 71 are arranged at equal intervals in the circumferential direction and are rotatably held, and a plurality of second balls 75 are arranged between the outer ring 41 and the second inner ring 60 in the circumferential direction. The second balls 75 are arranged at equal intervals in the circumferential direction and rotatably held, a shim 78 interposed between the first inner ring 50 and the second inner ring 60, and the first inner ring 50 and the second inner ring 60 through the shim 78 in the axial direction connecting bolt 83 It is equipped with a.

  An end surface 51 of the first inner ring 50 opposite to the second inner ring 60 extends in the radial direction and has a surface perpendicular to the axis. An end surface 61 of the second inner ring 60 opposite to the first inner ring 50 extends in the radial direction and has a surface perpendicular to the axis.

  As shown in FIG. 1, the outer ring 41 has a disc-shaped flange 42 that is short in the axial direction and protrudes in the outer diameter direction. The outer periphery 43 of the collar part 42 has a cylindrical shape, and the end surface 44 of the collar part 42 extends in the outer diameter direction and has a surface perpendicular to the axis. The outer periphery 43 of the flange portion 42 is fitted to the inner periphery 12 of the housing 11, and the end surface 44 of the flange portion 42 is in contact with the step surface 13 of the housing 11. In such a state, the outer ring 41 is fixed to the housing 11 via the fixing bolt 80.

  In order to insert and screw the fixing bolt 80, a fourth insertion hole 45 is formed in the flange portion 42 in the axial direction, and a third screw hole 14 is formed in the housing 11 at a position corresponding to the fourth insertion hole 45. . The outer periphery 43 of the flange 42 is fitted to the inner periphery 12 of the housing 11, and the fixing bolt 80 is inserted into the fourth insertion hole 45 in a state where the end surface 44 of the flange 42 is in contact with the step surface 13 of the housing 11. The outer ring 41 is fixed to the housing 11 by screwing the fixing bolt 80 into the third screw hole 14. As shown in FIG. 4, a plurality of fixing bolts 80 are provided at equal intervals in the circumferential direction.

  As shown in FIG. 3, in order to insert and screw the connection bolt 83, a fifth insertion hole 64 is formed in the second inner ring 60 in the axial direction, and the shim 78 is inserted at a position corresponding to the fifth insertion hole 64. A hole is formed, and a fourth screw hole 53 is formed in the first inner ring 50 at a position corresponding to the fifth insertion hole 64. With the end surface of the first inner ring 50 and the end surface of the second inner ring 60 in contact with each other via the shim 78, the connecting bolt 83 is inserted into the fifth insertion hole 64, and is inserted into the insertion hole of the shim 78. The first inner ring 50 and the second inner ring 60 are connected to each other via a shim 78 by being screwed into the fourth screw hole 53.

  The shim 78 is used to adjust the preload between the outer ring 41, the first ball 70 and the first inner ring 50 and the preload between the outer ring 41, the second ball 75 and the second inner ring 60. A plurality of shims 78 having different thicknesses are prepared, and the thickness of the shim 78 is changed until an optimum preload is obtained. As the thickness of the shim 78 becomes thinner, the preload tends to increase.

  As shown in FIG. 1, the first rotating member 20 includes a first flange portion 22 that extends in the outer diameter direction, and a first cylindrical portion 21 that extends in the axial direction on the inner diameter side of the first flange portion 22. An end surface 23 of the first flange portion 22 on the first inner ring 50 side extends in the radial direction and has a surface perpendicular to the axis. The first rotating member 20 is attached to the first inner ring 50 and the second inner ring 60 via first mounting bolts 81 with the end face 23 of the first flange portion 22 in contact with the end face 51 of the first inner ring 50. .

  In order to insert and screw the first mounting bolt 81, a first insertion hole 24 is formed in the first flange portion 22 in the axial direction, and the first inner ring 50 is axially positioned at a position corresponding to the first insertion hole 24. The second insertion hole 52 is formed in the shim 78, the insertion hole corresponding to the second insertion hole 52 is formed in the shim 78, and the first screw hole 62 is formed in the second inner ring 60 at a position corresponding to the second insertion hole 52. . With the first flange portion 22 in contact with the end surface 51 of the first inner ring 50 opposite to the second inner ring 60, the first mounting bolt 81 is inserted through the first insertion hole 24 and the second insertion hole 52, and the shim 78 The first rotating member 20 is attached to the first inner ring 50 and the second inner ring 60 by inserting the first attachment bolt 81 into the first screw hole 62 and inserting the first attachment bolt 81 into the first inner ring 50. As shown in FIG. 4, a plurality of first mounting bolts 81 are provided at equal intervals in the circumferential direction.

  As shown in FIG. 2, the second rotating member 30 includes a second flange portion 32 extending in the outer diameter direction, and a second cylindrical portion extending in the axial direction to the opposite side of the second inner ring 60 with respect to the second flange portion 32. 31 and a third cylindrical portion 33 extending in the axial direction toward the second inner ring 60 with respect to the second flange portion 32. An end surface 35 of the second flange portion 32 on the second inner ring 60 side extends in the radial direction and has a surface perpendicular to the axis. The outer periphery 34 of the third cylindrical portion 33 has a cylindrical shape. The second rotating member 30 is in a state where the end surface 35 of the second flange portion 32 is in contact with the end surface 61 of the second inner ring 60 and the outer periphery 34 of the third cylindrical portion 33 is fitted to the inner periphery of the second inner ring 60. 2 It is attached to the second inner ring 60 via mounting bolts 82.

  A plurality of pulley grooves 37 are formed on the outer periphery of the second cylindrical portion 31 in the axial direction. A belt (not shown) is hung on the pulley groove 37 so that the rotational power of the electric motor (not shown) is transmitted to the second rotating member 30 via the belt.

  In order to insert and screw the second mounting bolt 82, the third insertion hole 36 is formed in the second flange portion 32 in the axial direction, and the second inner ring 60 is axially positioned at a position corresponding to the third insertion hole 36. The second screw hole 63 is formed in With the end surface 35 of the second flange portion 32 in contact with the end surface 61 of the second inner ring 60, the second mounting bolt 82 is inserted into the third insertion hole 36, and the second mounting bolt 82 is screwed into the second screw hole 63. The second rotating member 30 is attached to the second inner ring 60 by combining them. As shown in FIG. 4, a plurality of second mounting bolts 82 are provided at equal intervals in the circumferential direction.

  Next, the assembly operation of the rotating device 10 will be described based on the above-described configuration.

  As shown in FIG. 1, the outer ring 41 is inserted into the inner periphery 12 of the housing 11 with the housing 11 standing on the floor surface. The outer periphery 43 of the flange 42 of the outer ring 41 is fitted to the inner periphery 12 of the housing 11, and the end surface 44 of the flange 42 contacts the step surface 13 of the housing 11. In this state, the fixing bolt 80 is inserted into the fourth insertion hole 45 and the fixing bolt 80 is screwed into the third screw hole 14. In this way, the outer ring 41 is fixed to the housing 11. Before the outer ring 41 is inserted into the inner periphery 12 of the housing 11, the first ball 70 and the first cage 71, the second ball 75 and the second cage 76 are assembled in advance.

  As shown in FIG. 3, the first inner ring 50 is inserted into the inner circumference of the first ball 70 and the first holder 71, and the second inner ring 60 is inserted into the second ball 75 and the second holder 76. At this time, the second inner ring 60 is inserted with the shim 78 attached to the end face. In this state, the connecting bolt 83 is inserted into the fifth insertion hole 64, inserted into the insertion hole of the shim 78, and the connecting bolt 83 is screwed into the fourth screw hole 53. Thus, the first inner ring 50 and the second inner ring 60 are connected to each other via the shim 78.

  The first inner ring 50 and the second inner ring 60 are rotated with respect to the outer ring 41, and the preload between the outer ring 41, the first ball 70 and the first inner ring 50 is calculated from the rotational torque, and the space between the outer ring 41, the second ball 75 and the second inner ring 60. Know the preload. Until the preload becomes optimum, the second inner ring 60 is removed, the shim 78 is replaced, and the operation of attaching the second inner ring 60 is repeated.

  When the preload is optimized, the first rotating member 20 is moved to the first inner ring 50 side, and the end face 23 of the first flange portion 22 contacts the end face 51 of the first inner ring 50. In this state, as shown in FIG. 1, the first mounting bolt 81 is inserted into the first insertion hole 24 and the second insertion hole 52, and the first mounting bolt 81 is inserted into the insertion hole of the shim 78. Screwed into the screw hole 62. Thus, the first rotating member 20 is attached to the first inner ring 50 and the second inner ring 60.

  The second rotating member 30 is moved to the second inner ring 60 side, and the end surface 35 of the second flange portion 32 is in contact with the end surface 61 of the second inner ring 60. In this state, as shown in FIG. 4, the second mounting bolt 82 is inserted into the third insertion hole 36, and the second mounting bolt 82 is screwed into the second screw hole 63. Thus, the second rotating member 30 is attached to the second inner ring 60.

  An unillustrated X-ray tube device that generates X-rays and an unillustrated detection device that detects X-rays are attached to the second rotating member 30. A belt (not shown) is hung on the pulley groove 37 of the second rotating member 30 and a drive pulley of an electric motor (not shown).

  The first rotating member 20 overhangs in the axial direction with respect to the first inner ring 50, and a moment due to the weight of the first rotating member, the X-ray tube device and the detection device acts on the first inner ring 50 and the second inner ring 60. The first inner ring 50 and the second inner ring 60 are deformed in the same direction at the upper part by the moment, and the first inner ring 50 and the second inner ring 60 are not separated from each other. Therefore, the outer ring 41, the first ball 70, and the second inner ring 60 The preload between the outer ring 41, the second ball 75 and the second inner ring 60 is not lost.

  By driving the electric motor, the second rotating member 30, the first rotating member 20, the first inner ring 50, and the second inner ring 60 are rotated via the belt. At this time, no noise is generated because there is no preload loss.

  The present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.

  In the embodiment described above, the first rotating member in which the first flange portion 22 extends in the outer diameter direction at one end of the first cylindrical portion 21 is applied. As another embodiment, a first rotating member in which the first flange portion extends in the inner diameter direction at one end of the first cylindrical portion may be applied. In this case, the first inner ring needs to protrude in the axial direction with respect to the outer ring so that the first flange portion does not contact the outer ring.

  In the embodiment described above, the spherical first ball 70 is applied as the first rolling element, and the spherical second ball 75 is applied as the second rolling element. As another embodiment, a tapered first tapered roller may be applied as the first rolling element, and a tapered second tapered roller may be applied as the second rolling element.

11: housing, 20: first rotating member (rotating member), 21: first cylindrical portion (cylindrical portion), 22: first flange portion (flange portion), 23: end face, 24: first insertion hole, 41: Outer ring, 50: first inner ring, 51: end face, 52: second insertion hole, 60: second inner ring, 62: first screw hole (screw hole), 70: first ball (first rolling element), 75: Second ball (second rolling element), 81: first mounting bolt (mounting bolt)

Claims (1)

A housing having a cylindrical inner periphery, an annular outer ring fitted to the inner periphery of the housing, an annular first inner ring disposed on the inner peripheral side of the outer ring, and an inner peripheral side of the outer ring A second inner ring disposed adjacent to the first inner ring in the axial direction; a plurality of first rolling elements disposed circumferentially between the outer ring and the first inner ring; the outer ring and the first A plurality of second rolling elements arranged in a circumferential direction between the two inner rings, a connecting bolt for connecting the first inner ring and the second inner ring in the axial direction, and a flange portion extending in the radial direction; A rotating member that is attached in a state where the flange portion is in contact with an end surface of the first inner ring opposite to the second inner ring, and a mounting bolt that attaches the rotating member. In the rotating device
Forming a first insertion hole through which the mounting bolt is inserted in the axial direction in the flange portion;
Forming a second insertion hole through which the mounting bolt is inserted in the axial direction at a position corresponding to the first insertion hole in the first inner ring;
Forming a screw hole into which the mounting bolt is screwed into the second inner ring at a position corresponding to the second insertion hole;
With the flange portion in contact with the end surface of the first inner ring opposite to the second inner ring, the mounting bolt is inserted into the first insertion hole and the second insertion hole, and the mounting bolt is screwed into the screw hole. A rotating device characterized in that the rotating member is attached to the first inner ring and the second inner ring by combining them.

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