WO2024028950A1 - Bearing greasing structure - Google Patents

Bearing greasing structure Download PDF

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Publication number
WO2024028950A1
WO2024028950A1 PCT/JP2022/029521 JP2022029521W WO2024028950A1 WO 2024028950 A1 WO2024028950 A1 WO 2024028950A1 JP 2022029521 W JP2022029521 W JP 2022029521W WO 2024028950 A1 WO2024028950 A1 WO 2024028950A1
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WO
WIPO (PCT)
Prior art keywords
bearing
rotating body
greasing
sealed space
housing
Prior art date
Application number
PCT/JP2022/029521
Other languages
French (fr)
Japanese (ja)
Inventor
磊 王
聡 矢野
Original Assignee
ファナック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ファナック株式会社 filed Critical ファナック株式会社
Priority to PCT/JP2022/029521 priority Critical patent/WO2024028950A1/en
Publication of WO2024028950A1 publication Critical patent/WO2024028950A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings

Definitions

  • the present invention relates to a greasing structure that supplies lubricant to a bearing.
  • Patent Document 1 listed below discloses an injection molding machine that can move an injection screw by converting the rotational motion of the ball screw into linear motion using a combination of a ball screw and a ball nut and pressing a pusher plate. .
  • This injection molding machine has the following configuration.
  • the screw sleeve provided with the injection screw is provided in the through hole of the pusher plate via the bearing.
  • the screw sleeve is therefore rotatable relative to the pusher plate.
  • the ball screw is provided on the inner circumference of the screw sleeve via a bearing.
  • the ball screw is therefore rotatable relative to the screw sleeve.
  • a lubrication structure is desired that has a simple configuration and can easily lubricate a bearing in which an inner ring and an outer ring rotate.
  • One aspect of the present disclosure includes a hollow housing, an outer bearing having an outer ring held on an inner circumferential surface of the housing, a first rotating body that is hollow and fixed to the inner ring of the outer bearing, and
  • the housing includes an inner bearing in which an outer ring is held on the inner circumferential surface of one rotating body, and a second rotating body fixed to the inner ring of the inner bearing, and the housing is configured to allow a lubricant supplied to the inner bearing to pass therethrough.
  • the downstream side of the first greasing passage communicates with a first sealed space between the housing and the first rotating body, and the first greasing passage has a first
  • the rotary body has a second greasing passage whose upstream side communicates with the first sealed space, and a downstream side of the second greasing passage is between the first rotary body and the second rotary body.
  • This is a bearing greasing structure that communicates with a sealed second sealed space, and in which the inner bearing is disposed.
  • a lubrication structure that can easily lubricate a bearing in which an inner ring and an outer ring rotate with a simple configuration.
  • FIG. 1 is a right side view showing an example of an injection molding machine to which the bearing lubrication structure according to the first embodiment of the present invention is applied, with a part thereof shown in cross section.
  • FIG. 3 is a right side view showing a modification of the bearing greasing structure according to the first embodiment, with a portion shown in cross section.
  • FIG. 7 is a right side view showing a bearing lubrication structure according to a second embodiment of the present invention, with a portion shown in cross section.
  • FIG. 7 is a right side view showing a modification of the bearing lubrication structure according to the second embodiment, with a portion shown in cross section.
  • FIG. 7 is a right side view showing a bearing lubrication structure according to a third embodiment of the present invention, with a portion shown in cross section. It is a right view which shows the modification of the greasing structure of the bearing based on 3rd Embodiment, and shows it partially made into a cross section.
  • the bearing greasing structure includes a housing 1, an outer bearing 2, a first rotating body 3, an inner bearing 4, and a second rotating body 5.
  • a case where the present invention is applied to the injection molding machine 6 will be described.
  • the apparatus to which the present invention is applied is not limited to the injection molding machine 6.
  • the injection molding machine 6 includes a front plate 7 and a rear plate 8 that are arranged to face each other, a guide rod 9 that connects the front plate 7 and the rear plate 8, and a housing 1 that is slidably provided on the guide rod 9. , a first rotating body 3 rotatably but immovably provided in the axial direction in the housing 1; an injection screw 10 provided in the first rotating body 3; A second rotating body 5 is provided, and a ball nut 11 is provided on the rear plate 8.
  • the injection molding machine 6 can move the injection screw 10 by converting the rotational motion of the second rotating body 5 screwed into the ball nut 11 into linear motion and pressing the housing 1.
  • the front plate 7 is plate-shaped.
  • the front plate 7 is provided with an injection cylinder 12.
  • the rear plate 8 is plate-shaped.
  • the rear plate 8 has a through hole 13 penetrating in the thickness direction.
  • the front plate 7 and the rear plate 8 are connected by a plurality of rod-shaped guide rods 9. Specifically, the rear plate 8 is fixed to one axial end of the guide rod 9 (the right end in FIG. 1), and the other axial end of the guide rod 9 (the left end in FIG. 1). By fixing the front plate 7 to the front plate 7, the front plate 7 and the rear plate 8 are connected while facing each other.
  • the housing 1 has a thick plate shape.
  • the housing 1 has a plurality of insertion holes 14 penetrating in the thickness direction (also in the axial direction of the guide rod 9).
  • the housing 1 is installed on the guide rod 9 by passing the guide rod 9 through the insertion hole 14 .
  • a cylindrical bush 15 is provided between the inner peripheral surface of the insertion hole 14 and the outer peripheral surface of the guide rod 9. In this way, the housing 1 is provided on the guide rod 9 so as to be slidable along the axial direction of the guide rod 9.
  • the housing 1 has a through hole 16 that penetrates in the thickness direction.
  • the through hole 16 is located approximately at the center of the housing 1.
  • the through hole 16 is a stepped hole. That is, the through hole 16 has a small diameter hole 17 located at one end in the axial direction and a large diameter hole 18 located at the other end in the axial direction. Since the housing 1 is provided with the through hole 16, in other words, the housing 1 is hollow with an inner peripheral surface.
  • the first rotating body 3 has a columnar main body portion 19 and a holding portion 20 for holding down an inner bearing 4, which will be described later.
  • the main body part 19 has a stepped cylindrical shape, and includes a large diameter part 21 located on one axial end side of the main body part 19 (the right end side in FIG. 1) and a small diameter part 22 adjacent to the large diameter part 21. have.
  • the main body portion 19 has a recessed portion 23 having a circular shape in rear view on one end surface in the axial direction. The recess 23 is open at one end of the main body 19 in the axial direction.
  • the recess 23 has a stepped shape and includes a large diameter hole 24 located at one end in the axial direction and a small diameter hole 25 located at the other end in the axial direction. Since the first rotating body 3 is provided with the recess 23, in other words, the first rotating body 3 is hollow with an inner peripheral surface.
  • the injection screw 10 is fixed to the other end of the main body 19 in the axial direction with a bolt or the like.
  • the holding part 20 is plate-shaped and has a through hole 26 penetrating in the thickness direction.
  • the first rotating body 3 is rotatably held in the housing 1 via the outer bearing 2.
  • the outer bearing 2 is, for example, a ball bearing.
  • the outer bearing 2 includes an adjacent first bearing 27 and a second bearing 28, an annular outer ring spacer 31 connecting an outer ring 29 of the first bearing 27 and an outer ring 30 of the second bearing 28, and the first bearing 27. It has an annular inner ring spacer 34 that connects the inner ring 32 of the second bearing 28 and the inner ring 33 of the second bearing 28 . A cylindrical gap is formed between the outer ring spacer 31 and the inner ring spacer 34.
  • the outer bearing 2 having such a configuration is provided in the housing 1 by holding the outer ring 29 of the first bearing 27 and the outer ring 30 of the second bearing 28 on the inner peripheral surface of the large diameter hole 18.
  • the outer ring 29 of the first bearing 27 located at one axial end of the outer bearing 2 (the right end in FIG. 1) has a large diameter hole 18 and a small diameter hole.
  • the outer ring 30 of the second bearing 28 which is in contact with the step between the second bearing 17 and the other end of the outer bearing 2 in the axial direction, is in contact with a presser part 36 provided on the housing 1 .
  • the holding portion 36 has a plate shape and is fixed to the other end surface of the housing 1 in the axial direction with a bolt or the like.
  • the holding portion 36 has a through hole 37 that penetrates in the thickness direction. In this way, the outer rings (29, 30) of the outer bearing 2 are held on the inner peripheral surface of the hollow housing 1.
  • the main body portion 19 of the first rotating body 3 is held by the inner ring 32 of the first bearing 27 and the inner ring 33 of the second bearing 28. At this time, the outer peripheral surface of the small diameter portion 22 of the main body portion 19 is fixed to the inner ring 32 of the first bearing 27 and the inner ring 33 of the second bearing 28 .
  • the inner ring 32 of the first bearing 27 is in contact with the step between the large diameter part 21 and the small diameter part 22, and the inner ring 32 of the first bearing 27 is in contact with the step between the large diameter part 21 and the small diameter part 22.
  • the inner ring 33 is in contact with an annular pressing portion 72 provided on the first rotating body 3 .
  • the holding portion 72 is fixed to the first rotating body 3 with the first rotating body 3 passing through it.
  • the first rotating body 3 is fixed to the inner ring (32, 33) of the outer bearing 2.
  • the other axial end of the first rotating body 3 (the left end in FIG. 1) is located on the other axial end side of the through hole 16 of the housing 1. It passes through the opening of and the through hole 37 of the holding part 36.
  • the second rotating body 5 is columnar.
  • the other end of the second rotating body 5 in the axial direction (the left end in FIG. 1) has a stepped cylindrical shape and includes a large diameter portion 39 and a small diameter portion 40.
  • the second rotating body 5 is rotatably supported by the first rotating body 3 via the inner bearing 4 .
  • the inner bearing 4 is, for example, a ball bearing. In the first embodiment, a plurality of inner bearings 4 are used, but only one inner bearing 4 may be used.
  • the plurality of inner bearings 4 are provided on the inner circumferential surface of the recess 23 of the first rotating body 3 while in contact with each other. At this time, the inner bearing 4 is provided on the first rotating body 3 by holding the outer ring 41 of the inner bearing 4 on the inner peripheral surface of the large diameter hole 24 of the recess 23 . In a state where a plurality of inner bearings 4 are provided in the first rotating body 3, the outer ring 41 of the inner bearing 4 located on the back side of the recess 23 is located at the step between the large diameter hole 24 and the small diameter hole 25. The outer ring 41 of the inner bearing 4 located on the opening side of the recess 23 is in contact with a presser portion 20 provided on the main body portion 19 . The holding portion 20 is fixed to one axial end surface of the main body portion 19 with a bolt or the like. In this way, the outer ring 41 of the inner bearing 4 is held on the inner peripheral surface of the hollow first rotating body 3.
  • the small diameter portion 40 of the second rotating body 5 is held by the inner ring 43 of the inner bearing 4 with the second rotating body 5 passing through the through hole 26 of the holding portion 20 of the first rotating body 3. At this time, the outer peripheral surface of the small diameter portion 40 of the second rotating body 5 is fixed to the inner ring 43 of the inner bearing 4.
  • the inner ring 43 of the inner bearing 4 located on the opening side of the recess 23 contacts the step between the small diameter part 40 and the large diameter part 39.
  • the inner ring 43 of the inner bearing 4 located on the back side of the recess 23 is in contact with an annular pressing portion 45 provided on the small diameter portion 40 of the second rotating body 5.
  • the holding portion 45 is fixed to the other axial end of the small diameter portion 40 with the small diameter portion 40 inserted therein.
  • the second rotating body 5 is fixed to the inner ring of the inner bearing 4.
  • the inner bearing 4 and the outer bearing 2 are arranged in a double arrangement, inside and outside.
  • the second rotating body 5 is provided with a male thread on the outer peripheral surface except for the other end in the axial direction.
  • the second rotating body 5 is screwed into a ball nut 11 provided on the rear plate 8.
  • the ball nut 11 is fixed non-rotatably in the through hole 13 of the rear plate 8.
  • the second rotating body 5 screwed into a ball nut 11 provided on the rear plate 8 passes through a through hole 13 in the rear plate 8. That is, one axial end of the second rotating body 5 protrudes from the through hole 13 of the rear plate 8.
  • One axial end of the second rotating body 5 passes through an annular load cell 46 provided on the rear plate 8.
  • the load cell 46 is fixed to the rear plate 8 with bolts or the like.
  • the injection molding machine 6 includes a motor 47 that rotates the first rotating body 3 to which the injection screw 10 is fixed, and a motor 48 that rotates the second rotating body 5.
  • the motor 47 is provided in the housing 1.
  • a drive pulley 49 is fixed to the drive shaft of the motor 47.
  • a belt 51 is wound around a drive pulley 49 provided on the motor 47 and a driven pulley 50 provided at the other axial end of the first rotating body 3 .
  • the motor 48 is provided in the housing 1 such that the first rotating body 3 is located between the motors 47 and 48.
  • a drive pulley 52 is fixed to the drive shaft of the motor 48.
  • a belt 54 is wound around a driving pulley 52 provided on the motor 48 and a driven pulley 53 provided on the second rotating body 5.
  • the injection screw 10 can be rotated by driving the motor 47 while the motor 48 is stopped.
  • a metering and kneading operation is performed, and the melted resin is fed into the tip of the injection cylinder 12.
  • the second rotating body 5 can be rotated by driving the motor 48 while the motor 47 is stopped.
  • the housing 1 can be moved toward the injection cylinder 12, and the injection screw 10 can be moved within the injection cylinder 12 to perform injection.
  • the bearing greasing structure according to the first embodiment is applied to the injection molding machine 6 as described above.
  • the bearing greasing structure includes a hollow housing 1, an outer bearing 2 whose outer ring is held on the inner peripheral surface of the housing 1, and a hollow first rotating body 3 fixed to the inner ring of the outer bearing 2. It includes an inner bearing 4 whose outer ring is held on the inner peripheral surface of the first rotating body 3, and a second rotating body 5 which is fixed to the inner ring of the inner bearing 4.
  • the housing 1, the outer bearing 2, the first rotating body 3, the inner bearing 4, and the second rotating body 5 have the configurations described above.
  • the housing 1 has a first lubricant passage 55 through which lubricant to be supplied to the inner bearing 4 passes.
  • the upstream opening of the first greasing passage 55 opens to the outside of the housing 1 .
  • a greasing port 56 consisting of a grease nipple or the like is provided at the opening on the upstream side of the first greasing path 55 .
  • a greasing device that automatically supplies lubricant is connected to the greasing port 56 .
  • the downstream side of the first greasing passage 55 communicates with a first sealed space 57 between the housing 1 and the first rotating body 3 .
  • the first sealed space 57 is formed by sealing the opening of a cylindrical gap located between the inner circumferential surface of the housing 1 and the outer circumferential surface of the first rotating body 3 with a sealing member. Ru.
  • the sealing member includes a first sealing material 58 provided on the outside of the first bearing 27 and a second sealing material 59 provided on the outside of the second bearing 28.
  • the first sealing material 58 seals one axial end (the right end in FIG. 1) of the cylindrical gap between the outer ring spacer 31 and the inner ring spacer 34.
  • the second sealing material 59 seals the other end of the cylindrical gap between the outer ring spacer 31 and the inner ring spacer 34 in the axial direction.
  • a first sealed space 57 is formed by sealing the cylindrical gap between the outer ring spacer 31 and the inner ring spacer 34.
  • the downstream side of the first greasing passage 55 is provided in the outer ring spacer 31. It communicates with the first sealed space 57 via the outer through hole 60 .
  • the first rotating body 3 has a second greasing passage 61 through which the lubricant flowing from the first greasing passage 55 through the first sealed space 57 passes.
  • the upstream side of the second greasing passage 61 communicates with the first sealed space 57 .
  • the cylindrical gap between the outer ring spacer 31 and the inner ring spacer 34 is the first sealed space 57. Therefore, the upstream side of the second greasing passage 61 is communicated with the first sealed space 57 via the inner through hole 62 provided in the inner ring spacer 34 .
  • the downstream side of the second greasing passage 61 communicates with a second sealed space 63 between the first rotating body 3 and the second rotating body 5 .
  • the second sealed space 63 is configured by sealing an opening of a cylindrical gap located between the inner circumferential surface of the first rotating body 3 and the outer circumferential surface of the second rotating body 5 with a sealing member 64. formed by.
  • the sealing member 64 seals the gap between the inner circumferential surface of the first rotating body 3 and the outer circumferential surface of the second rotating body 5 on the opening side of the recess 23 .
  • the sealing member 64 has an annular shape and is provided between the inner circumferential surface of the holding portion 20 of the first rotary body 3 and the outer circumferential surface of the large diameter portion 39 of the second rotary body 5 .
  • the sealing member 64 is a conventionally known oil seal, but is not limited thereto.
  • the inner bearing 4 is disposed within the second sealed space 63 thus formed.
  • the first rotating body 3 passes through the housing 1, so it has an exposed surface 65 exposed from the housing 1.
  • the exposed surface 65 is the outer peripheral surface of the holding portion 20 of the first rotating body 3.
  • the first rotating body 3 has a discharge path 66 that discharges the lubricant in the second sealed space 63 to the outside of the housing 1 .
  • the discharge path 66 is provided, for example, in the holding portion 20 of the first rotating body 3.
  • the discharge path 66 is a flow path through which the lubricant that has passed through the inner bearing 4 is discharged. Therefore, the upstream side of the discharge path 66 is communicated with the portion between the inner bearing 4 and the sealing member 64.
  • the outlet of the discharge passage 66 is open to the exposed surface 65.
  • the lubricant supplied from the lubrication device flows into the first sealed space 57 through the first lubrication path 55.
  • the lubricant flows from the first sealed space 57 into the second sealed space 63 through the second greasing path 61 .
  • lubricant is supplied to the inner bearing 4.
  • the lubricant is discharged to the outside of the housing 1 through the discharge passage 66. Therefore, according to the greasing structure of the first embodiment, the inner bearing 4 on which the inner ring 43 and the outer ring 41 rotate can be easily lubricated during operation of the injection molding machine 6 with a simple configuration. It is also suitable for automation.
  • the outlet of the discharge passage 66 is open to the exposed surface 65. Therefore, according to the lubricating structure of the first embodiment, the structure can be simpler than the structure in which lubricant is discharged through the housing 1.
  • the greasing structure of this modification includes a plurality of first greasing passages 55 and a plurality of second greasing passages 61.
  • the greasing structure of this modification includes two first greasing passages 55, 55 and second greasing passages 61, 61 corresponding to the two first greasing passages 55, 55, respectively. It has The two first greasing passages 55, 55 are provided at positions facing each other with the first rotating body 3 interposed therebetween. The two second greasing passages 61, 61 are provided at opposing positions with the first rotating body 3 in between. Accordingly, two outer through holes 60, 60 are provided in the outer ring spacer 31, and two inner through holes 62, 62 are provided in the inner ring spacer 34.
  • the lubricant is supplied to the second sealed space 63 from two supply paths. Therefore, according to the lubricating structure of this modification, lubricant can be efficiently supplied into the second sealed space 63.
  • FIG. 3 a bearing greasing structure according to a second embodiment of the present invention will be described using FIG. 3. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore descriptions thereof may be omitted below.
  • the greasing structure of the second embodiment differs from the first embodiment in the configuration of the first sealed space 57.
  • the through hole 16 of the housing 1 is a stepped hole.
  • the through hole 16 has a small diameter hole 67 located at one axial end of the through hole 16 and a large diameter hole 69 located at the other axial end of the through hole 16 .
  • the plurality of outer bearings 2 are provided in the large diameter hole 69 of the through hole 16 in a state in which they are in contact with each other. At this time, the outer ring 79 of the outer bearing 2 is held on the inner peripheral surface of the large diameter hole 69, so that the outer bearing 2 is provided in the housing 1. In a state where a plurality of outer bearings 2 are provided in the housing 1, the outer ring 79 of the outer bearing 2 located on one axial end side of the through hole 16 contacts the step between the large diameter hole 69 and the small diameter hole 67. The outer ring 79 of the outer bearing 2 located on the other axial end side of the through hole 16 is in contact with the pressing portion 36 provided on the housing 1 .
  • the holding portion 36 has a thick plate shape and is fixed to the other end surface of the housing 1 in the axial direction with a bolt or the like.
  • the holding portion 36 has a through hole 37 that penetrates in the thickness direction.
  • the through hole 37 is a stepped hole.
  • the main body portion 19 of the first rotating body 3 is held by the inner ring 80 of the outer bearing 2. At this time, the outer peripheral surface of the small diameter portion 22 of the main body portion 19 is fixed to the inner ring 80 of the outer bearing 2.
  • the inner ring 80 of the outer bearing 2 located on one axial end side of the through hole 16 is located at the stepped portion between the large diameter portion 21 and the small diameter portion 22.
  • the inner ring 80 of the outer bearing 2 which is in contact with the other end of the through hole 16 in the axial direction, is in contact with an annular pressing portion 72 provided on the first rotating body 3 .
  • the first sealed space 57 is configured by sealing an opening at one end in the axial direction of a cylindrical gap located between the housing 1 and the first rotating body 3 with an annular third sealing material 74. It is formed by sealing the opening on the other axial end side of the cylindrical gap located between the first rotation body 1 and the first rotating body 3 with an annular fourth sealing material 75.
  • the fourth sealing material 75 seals the gap between the inner circumferential surface of the small diameter hole of the through hole 37 of the holding portion 36 and the outer circumferential surface of the first rotating body 3 .
  • the outer bearing 2 is constructed such that the first portion 76 on one axial end side of the first sealed space 57 and the second portion 77 on the other axial end side of the first sealed space 57 remain. It is arranged within the sealed space 57. In this case, the downstream side of the first greasing passage 55 is communicated with the first portion 76 . The upstream side of the second greasing passage 61 communicates with the second portion 77 .
  • the lubricant supplied from the lubrication device flows into the first portion 76 of the first sealed space 57 through the first lubrication path 55.
  • the lubricant flows from the first portion 76 of the first sealed space 57 through the outer bearing 2 to the second portion 77 .
  • the lubricant flows from the second portion 77 of the first sealed space 57 into the second sealed space 63 through the second greasing passage 61 .
  • lubricant is supplied to the inner bearing 4.
  • the lubricant is discharged to the outside of the housing 1 through the discharge passage 66.
  • the greasing structure of this modification includes a plurality of first greasing passages 55 and a plurality of second greasing passages 61.
  • the greasing structure of this modification includes two first greasing passages 55, 55 and second greasing passages 61, 61 corresponding to the two first greasing passages 55, 55, respectively. It has The two first greasing passages 55, 55 are provided at positions facing each other with the first rotating body 3 interposed therebetween. The two second greasing passages 61, 61 are provided at positions facing each other with the first rotating body 3 interposed therebetween.
  • FIG. 5 a bearing greasing structure according to a third embodiment of the present invention will be described using FIG. 5. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore descriptions thereof may be omitted below.
  • the greasing structure of the third embodiment differs from the first embodiment in the configuration of the first sealed space 57.
  • the annular fifth sealing member 78 is provided between the housing 1 and the first rotating body 3 so that a gap is formed between the fifth sealing member 78 and the outer bearing 2.
  • the fifth sealing material 78 is provided so that a gap is formed between it and the first bearing 27 .
  • a first sealed space 57 is formed between the first sealing material 58 and the fifth sealing material 78 of the first bearing 27.
  • the fifth sealing material 78 is provided between the housing 1 and the first rotating body 3 so that a gap is formed between the fifth sealing member and the sealing member provided on the outer bearing 2. .
  • the outer bearing 2 is arranged adjacent to the first sealed space 57.
  • the outer bearing 2 is a bearing having an outer ring spacer 31 and an inner ring spacer 34, it may be a normal ball bearing. In this case, the outer bearing is provided with a sealing member.
  • the greasing structure of this modification includes a plurality of first greasing passages 55 and a plurality of second greasing passages 61.
  • the greasing structure of this modification includes two first greasing passages 55, 55 and second greasing passages 61, 61 corresponding to the two first greasing passages 55, 55, respectively. It has The two first greasing passages 55, 55 are provided at positions facing each other with the first rotating body 3 interposed therebetween. The two second greasing passages 61, 61 are provided at positions facing each other with the first rotating body 3 interposed therebetween.
  • the number of second greasing passages 61 may be greater than the number of first greasing passages 55.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

A bearing greasing structure of the present disclosure comprises: a hollow housing; an outer bearing with an outer ring held on an inner circumferential surface of the housing; a first rotating body that is hollow, and fixed to an inner ring of the outer bearing; an inner bearing with an outer ring held on an inner circumferential surface of the first rotating body; and a second rotating body fixed to an inner ring of the inner bearing. The housing has a first greasing path into which lubricant to be supplied to the inner bearing is introduced. A downstream side of the first greasing path communicates with a first sealed space sealed between the housing and the first rotating body. The first rotating body has a second greasing path with an upstream side communicating with the first sealed space. A downstream side of the second greasing path communicates with a second sealed space sealed between the first rotating body and the second rotating body. The inner bearing is disposed in the second sealed space.

Description

軸受の給脂構造Bearing greasing structure
　本発明は、軸受に潤滑剤を供給する給脂構造に関する。 The present invention relates to a greasing structure that supplies lubricant to a bearing.
　下記特許文献１には、ボールネジとボールナットとの組み合わせによってボールネジの回転運動を直線運動に変換してプッシャープレートを押圧することで、射出スクリューを移動させることができる射出成形機が開示されている。この射出成形機は、以下の構成を有している。 Patent Document 1 listed below discloses an injection molding machine that can move an injection screw by converting the rotational motion of the ball screw into linear motion using a combination of a ball screw and a ball nut and pressing a pusher plate. . This injection molding machine has the following configuration.
　射出スクリューが設けられたスクリュースリーブは、ベアリングを介して、プッシャープレートの貫通孔に設けられている。従って、スクリュースリーブは、プッシャープレートに対して回転可能である。ボールネジは、ベアリングを介して、スクリュースリーブの内周部に設けられている。従って、ボールネジは、スクリュースリーブに対して回転可能である。このような構成の射出成形機は、計量混錬時に射出スクリューが回転し、射出時にボールネジが回転する。従って、成形中において、ボールネジとスクリュースリーブとの間のベアリングにおける内輪及び外輪は、回転する。 The screw sleeve provided with the injection screw is provided in the through hole of the pusher plate via the bearing. The screw sleeve is therefore rotatable relative to the pusher plate. The ball screw is provided on the inner circumference of the screw sleeve via a bearing. The ball screw is therefore rotatable relative to the screw sleeve. In an injection molding machine having such a configuration, the injection screw rotates during metering and kneading, and the ball screw rotates during injection. Therefore, during molding, the inner and outer rings of the bearing between the ball screw and the screw sleeve rotate.
特開平８－１９２４４７号公報Japanese Patent Application Publication No. 8-192447
　近年、ボールネジとスクリュースリーブとの間のベアリングは、厳しい条件下で使用されることが多い。従って、ボールネジとスクリュースリーブとの間のベアリングには、耐久性を高めるために、定期的に給脂する（潤滑剤を供給する）必要がある。 In recent years, bearings between ball screws and screw sleeves are often used under harsh conditions. Therefore, the bearing between the ball screw and the screw sleeve needs to be periodically lubricated (supplied with lubricant) to increase durability.
　上述したような内輪及び外輪が回転する構成を有する場合、ボールネジとスクリュースリーブとの間のベアリングに、自動給脂装置からチューブを介して給脂しようとすると、チューブが回ってしまうため、チューブを用いた自動給脂を行うことができない。そこで、射出成形機を停止した状態で、グリスガンを用いて手動で給脂を行うことが考えられる。 If the inner ring and outer ring have a rotating configuration as described above, if you try to grease the bearing between the ball screw and the screw sleeve through the tube from an automatic lubrication device, the tube will rotate, so it is necessary to remove the tube. automatic lubrication cannot be performed using Therefore, it is conceivable to manually replenish the injection molding machine with a grease gun while the injection molding machine is stopped.
　しかしながら、この場合、射出成形機を停止する必要があるので、射出成形機の稼働率の低下を招く。また、手動で給脂を行うので、給脂のし忘れ、及び給脂作業のし難さ等の問題が生じる。そのため、簡易な構成で、内輪及び外輪が回転する軸受に容易に給脂できる給脂構造が望まれている。 However, in this case, it is necessary to stop the injection molding machine, resulting in a decrease in the operating rate of the injection molding machine. Furthermore, since greasing is performed manually, problems such as forgetting to replenish the oil and difficulty in performing the greasing operation occur. Therefore, a lubrication structure is desired that has a simple configuration and can easily lubricate a bearing in which an inner ring and an outer ring rotate.
　本開示の一態様は、中空状のハウジングと、前記ハウジングの内周面に外輪が保持される外側軸受と、中空状で、前記外側軸受の内輪に固定される第１回転体と、前記第１回転体の内周面に外輪が保持される内側軸受と、前記内側軸受の内輪に固定される第２回転体と、を備え、前記ハウジングは、前記内側軸受に供給される潤滑剤が通される第１給脂路を有し、前記第１給脂路の下流側は、前記ハウジングと前記第１回転体との間の封止された第１封止空間に連通され、前記第１回転体は、上流側が前記第１封止空間に連通される第２給脂路を有し、前記第２給脂路の下流側は、前記第１回転体と前記第２回転体との間の封止された第２封止空間に連通され、前記第２封止空間内に前記内側軸受が配置される、軸受の給脂構造である。 One aspect of the present disclosure includes a hollow housing, an outer bearing having an outer ring held on an inner circumferential surface of the housing, a first rotating body that is hollow and fixed to the inner ring of the outer bearing, and The housing includes an inner bearing in which an outer ring is held on the inner circumferential surface of one rotating body, and a second rotating body fixed to the inner ring of the inner bearing, and the housing is configured to allow a lubricant supplied to the inner bearing to pass therethrough. The downstream side of the first greasing passage communicates with a first sealed space between the housing and the first rotating body, and the first greasing passage has a first The rotary body has a second greasing passage whose upstream side communicates with the first sealed space, and a downstream side of the second greasing passage is between the first rotary body and the second rotary body. This is a bearing greasing structure that communicates with a sealed second sealed space, and in which the inner bearing is disposed.
　一態様によれば、簡易な構成で、内輪及び外輪が回転する軸受に容易に給脂できる給脂構造を提供することができる。 According to one aspect, it is possible to provide a lubrication structure that can easily lubricate a bearing in which an inner ring and an outer ring rotate with a simple configuration.
本発明の第１実施形態に係る軸受の給脂構造が適用される射出成形機の一例を示す右側面図であり、一部を断面にして示している。1 is a right side view showing an example of an injection molding machine to which the bearing lubrication structure according to the first embodiment of the present invention is applied, with a part thereof shown in cross section. 第１実施形態に係る軸受の給脂構造の変形例を示す右側面図であり、一部を断面にして示している。FIG. 3 is a right side view showing a modification of the bearing greasing structure according to the first embodiment, with a portion shown in cross section. 本発明の第２実施形態に係る軸受の給脂構造を示す右側面図であり、一部を断面にして示している。FIG. 7 is a right side view showing a bearing lubrication structure according to a second embodiment of the present invention, with a portion shown in cross section. 第２実施形態に係る軸受の給脂構造の変形例を示す右側面図であり、一部を断面にして示している。FIG. 7 is a right side view showing a modification of the bearing lubrication structure according to the second embodiment, with a portion shown in cross section. 本発明の第３実施形態に係る軸受の給脂構造を示す右側面図であり、一部を断面にして示している。FIG. 7 is a right side view showing a bearing lubrication structure according to a third embodiment of the present invention, with a portion shown in cross section. 第３実施形態に係る軸受の給脂構造の変形例を示す右側面図であり、一部を断面にして示している。It is a right view which shows the modification of the greasing structure of the bearing based on 3rd Embodiment, and shows it partially made into a cross section.
　以下、本開示の一態様に係る軸受の給脂構造について、図面を参照して説明する。図１を参照して、第１実施形態に係る軸受の給脂構造について説明する。軸受の給脂構造は、ハウジング１、外側軸受２、第１回転体３、内側軸受４及び第２回転体５を備える。ここでは、射出成形機６に、本発明が適用される場合について説明する。なお、本発明が適用される装置は、射出成形機６に限定されない。 Hereinafter, a bearing greasing structure according to one aspect of the present disclosure will be described with reference to the drawings. With reference to FIG. 1, a bearing greasing structure according to a first embodiment will be described. The bearing greasing structure includes a housing 1, an outer bearing 2, a first rotating body 3, an inner bearing 4, and a second rotating body 5. Here, a case where the present invention is applied to the injection molding machine 6 will be described. Note that the apparatus to which the present invention is applied is not limited to the injection molding machine 6.
　射出成形機６は、対面して配置されるフロントプレート７及びリアプレート８と、フロントプレート７とリアプレート８とを接続するガイドロッド９と、ガイドロッド９に摺動可能に設けられるハウジング１と、ハウジング１に回転可能かつ軸方向に移動不能に設けられる第１回転体３と、第１回転体３に設けられる射出スクリュー１０と、第１回転体３に回転可能かつ軸方向に移動不能に設けられる第２回転体５と、リアプレート８に設けられるボールナット１１とを備える。射出成形機６は、ボールナット１１にねじ込まれた第２回転体５の回転運動を直線運動に変換してハウジング１を押圧することで、射出スクリュー１０を移動させることができる。 The injection molding machine 6 includes a front plate 7 and a rear plate 8 that are arranged to face each other, a guide rod 9 that connects the front plate 7 and the rear plate 8, and a housing 1 that is slidably provided on the guide rod 9. , a first rotating body 3 rotatably but immovably provided in the axial direction in the housing 1; an injection screw 10 provided in the first rotating body 3; A second rotating body 5 is provided, and a ball nut 11 is provided on the rear plate 8. The injection molding machine 6 can move the injection screw 10 by converting the rotational motion of the second rotating body 5 screwed into the ball nut 11 into linear motion and pressing the housing 1.
　フロントプレート７は、板状である。フロントプレート７には、射出シリンダー１２が設けられる。リアプレート８は、板状である。リアプレート８は、厚さ方向に貫通する貫通孔１３を有している。フロントプレート７とリアプレート８とは、棒状の複数のガイドロッド９によって接続される。具体的には、ガイドロッド９の軸方向一端部（図１における右側の端部）にリアプレート８が固定されるとともに、ガイドロッド９の軸方向他端部（図１における左側の端部）にフロントプレート７が固定されることで、フロントプレート７とリアプレート８とは、対面した状態で接続される。 The front plate 7 is plate-shaped. The front plate 7 is provided with an injection cylinder 12. The rear plate 8 is plate-shaped. The rear plate 8 has a through hole 13 penetrating in the thickness direction. The front plate 7 and the rear plate 8 are connected by a plurality of rod-shaped guide rods 9. Specifically, the rear plate 8 is fixed to one axial end of the guide rod 9 (the right end in FIG. 1), and the other axial end of the guide rod 9 (the left end in FIG. 1). By fixing the front plate 7 to the front plate 7, the front plate 7 and the rear plate 8 are connected while facing each other.
　ハウジング１は、厚板状である。ハウジング１は、厚さ方向（ガイドロッド９の軸方向でもある）に貫通する挿通孔１４を複数有している。ハウジング１は、挿通孔１４にガイドロッド９が通されることで、ガイドロッド９に設けられる。挿通孔１４にガイドロッド９が通された状態において、挿通孔１４の内周面とガイドロッド９の外周面との間には、筒状のブッシュ１５が設けられる。このようにしてハウジング１は、ガイドロッド９の軸方向に沿って摺動可能に、ガイドロッド９に設けられる。 The housing 1 has a thick plate shape. The housing 1 has a plurality of insertion holes 14 penetrating in the thickness direction (also in the axial direction of the guide rod 9). The housing 1 is installed on the guide rod 9 by passing the guide rod 9 through the insertion hole 14 . In a state where the guide rod 9 is passed through the insertion hole 14, a cylindrical bush 15 is provided between the inner peripheral surface of the insertion hole 14 and the outer peripheral surface of the guide rod 9. In this way, the housing 1 is provided on the guide rod 9 so as to be slidable along the axial direction of the guide rod 9.
　ハウジング１は、厚さ方向に貫通する貫通孔１６を有している。貫通孔１６は、ハウジング１の略中央部に位置している。図示例では、貫通孔１６は、段付き孔である。すなわち、貫通孔１６は、軸方向一端側に位置する小径孔１７と、軸方向他端側に位置する大径孔１８とを有している。ハウジング１には貫通孔１６が設けられるので、言い換えれば、ハウジング１は、内周面を有する中空状である。 The housing 1 has a through hole 16 that penetrates in the thickness direction. The through hole 16 is located approximately at the center of the housing 1. In the illustrated example, the through hole 16 is a stepped hole. That is, the through hole 16 has a small diameter hole 17 located at one end in the axial direction and a large diameter hole 18 located at the other end in the axial direction. Since the housing 1 is provided with the through hole 16, in other words, the housing 1 is hollow with an inner peripheral surface.
　第１回転体３は、柱状の本体部１９と、後述する内側軸受４を押さえるための押さえ部２０とを有している。本体部１９は、段付き円柱状で、本体部１９の軸方向一端側（図１における右側の端部側）に位置する大径部２１と、大径部２１に隣接する小径部２２とを有している。本体部１９は、軸方向一端面に背面視円形状の凹部２３を有している。凹部２３は、本体部１９の軸方向一端側に開口している。図示例では、凹部２３は、段付き状で、軸方向一端側に位置する大径孔部２４と、軸方向他端側に位置する小径孔部２５とを有している。第１回転体３には凹部２３が設けられるので、言い換えれば、第１回転体３は、内周面を有する中空状である。本体部１９の軸方向他端側には、射出スクリュー１０がボルトなどによって固定される。押さえ部２０は、板状で、厚さ方向に貫通する貫通孔２６を有している。第１回転体３は、外側軸受２を介して、ハウジング１に回転可能に保持される。第１実施形態では、外側軸受２は、例えば玉軸受（ボールベアリング）である。 The first rotating body 3 has a columnar main body portion 19 and a holding portion 20 for holding down an inner bearing 4, which will be described later. The main body part 19 has a stepped cylindrical shape, and includes a large diameter part 21 located on one axial end side of the main body part 19 (the right end side in FIG. 1) and a small diameter part 22 adjacent to the large diameter part 21. have. The main body portion 19 has a recessed portion 23 having a circular shape in rear view on one end surface in the axial direction. The recess 23 is open at one end of the main body 19 in the axial direction. In the illustrated example, the recess 23 has a stepped shape and includes a large diameter hole 24 located at one end in the axial direction and a small diameter hole 25 located at the other end in the axial direction. Since the first rotating body 3 is provided with the recess 23, in other words, the first rotating body 3 is hollow with an inner peripheral surface. The injection screw 10 is fixed to the other end of the main body 19 in the axial direction with a bolt or the like. The holding part 20 is plate-shaped and has a through hole 26 penetrating in the thickness direction. The first rotating body 3 is rotatably held in the housing 1 via the outer bearing 2. In the first embodiment, the outer bearing 2 is, for example, a ball bearing.
　外側軸受２は、隣接する第１軸受２７及び第２軸受２８と、第１軸受２７の外輪２９と第２軸受２８の外輪３０とを接続する円環状の外輪間座３１と、第１軸受２７の内輪３２と第２軸受２８の内輪３３とを接続する円環状の内輪間座３４とを有している。外輪間座３１と内輪間座３４との間には、円筒状隙間が形成されている。このような構成の外側軸受２は、第１軸受２７の外輪２９及び第２軸受２８の外輪３０が大径孔１８の内周面に保持されることで、ハウジング１に設けられる。外側軸受２がハウジング１に設けられた状態において、外側軸受２の軸方向一端側（図１における右側の端部側）に位置する第１軸受２７の外輪２９は、大径孔１８と小径孔１７との間の段部に接触しており、外側軸受２の軸方向他端側に位置する第２軸受２８の外輪３０は、ハウジング１に設けられる押さえ部３６に接触している。押さえ部３６は、板状で、ハウジング１の軸方向他端面にボルトなどで固定される。押さえ部３６は、厚さ方向に貫通する貫通孔３７を有している。このようにして外側軸受２の外輪（２９，３０）は、中空状のハウジング１の内周面に保持される。 The outer bearing 2 includes an adjacent first bearing 27 and a second bearing 28, an annular outer ring spacer 31 connecting an outer ring 29 of the first bearing 27 and an outer ring 30 of the second bearing 28, and the first bearing 27. It has an annular inner ring spacer 34 that connects the inner ring 32 of the second bearing 28 and the inner ring 33 of the second bearing 28 . A cylindrical gap is formed between the outer ring spacer 31 and the inner ring spacer 34. The outer bearing 2 having such a configuration is provided in the housing 1 by holding the outer ring 29 of the first bearing 27 and the outer ring 30 of the second bearing 28 on the inner peripheral surface of the large diameter hole 18. When the outer bearing 2 is installed in the housing 1, the outer ring 29 of the first bearing 27 located at one axial end of the outer bearing 2 (the right end in FIG. 1) has a large diameter hole 18 and a small diameter hole. The outer ring 30 of the second bearing 28 , which is in contact with the step between the second bearing 17 and the other end of the outer bearing 2 in the axial direction, is in contact with a presser part 36 provided on the housing 1 . The holding portion 36 has a plate shape and is fixed to the other end surface of the housing 1 in the axial direction with a bolt or the like. The holding portion 36 has a through hole 37 that penetrates in the thickness direction. In this way, the outer rings (29, 30) of the outer bearing 2 are held on the inner peripheral surface of the hollow housing 1.
　第１回転体３の本体部１９は、第１軸受２７の内輪３２及び第２軸受２８の内輪３３に保持される。この際、第１軸受２７の内輪３２及び第２軸受２８の内輪３３に、本体部１９の小径部２２の外周面が固定される。第１回転体３が外側軸受２に保持された状態において、第１軸受２７の内輪３２は、大径部２１と小径部２２との間の段部に接触しており、第２軸受２８の内輪３３は、第１回転体３に設けられる円環状の押さえ部７２に接触している。押さえ部７２は、第１回転体３が貫通した状態で、第１回転体３に固定される。このようにして第１回転体３は、外側軸受２の内輪（３２，３３）に固定される。外側軸受２に第１回転体３が固定された状態において、第１回転体３の軸方向他端部（図１における左側の端部）は、ハウジング１の貫通孔１６の軸方向他端側の開口及び押さえ部３６の貫通孔３７を貫通している。 The main body portion 19 of the first rotating body 3 is held by the inner ring 32 of the first bearing 27 and the inner ring 33 of the second bearing 28. At this time, the outer peripheral surface of the small diameter portion 22 of the main body portion 19 is fixed to the inner ring 32 of the first bearing 27 and the inner ring 33 of the second bearing 28 . When the first rotating body 3 is held by the outer bearing 2, the inner ring 32 of the first bearing 27 is in contact with the step between the large diameter part 21 and the small diameter part 22, and the inner ring 32 of the first bearing 27 is in contact with the step between the large diameter part 21 and the small diameter part 22. The inner ring 33 is in contact with an annular pressing portion 72 provided on the first rotating body 3 . The holding portion 72 is fixed to the first rotating body 3 with the first rotating body 3 passing through it. In this way, the first rotating body 3 is fixed to the inner ring (32, 33) of the outer bearing 2. In a state where the first rotating body 3 is fixed to the outer bearing 2, the other axial end of the first rotating body 3 (the left end in FIG. 1) is located on the other axial end side of the through hole 16 of the housing 1. It passes through the opening of and the through hole 37 of the holding part 36.
　第２回転体５は、柱状である。図示例では、第２回転体５の軸方向他端側（図１における左側の端部側）は、段付き円柱状で、大径部３９及び小径部４０を有している。第２回転体５は、内側軸受４を介して、第１回転体３に回転可能に支持される。内側軸受４は、例えば玉軸受である。第１実施形態では、内側軸受４は、複数用いられているが、１つであってもよい。 The second rotating body 5 is columnar. In the illustrated example, the other end of the second rotating body 5 in the axial direction (the left end in FIG. 1) has a stepped cylindrical shape and includes a large diameter portion 39 and a small diameter portion 40. The second rotating body 5 is rotatably supported by the first rotating body 3 via the inner bearing 4 . The inner bearing 4 is, for example, a ball bearing. In the first embodiment, a plurality of inner bearings 4 are used, but only one inner bearing 4 may be used.
　複数の内側軸受４は、互いに接触した状態で、第１回転体３の凹部２３の内周面に設けられる。この際、凹部２３の大径孔部２４の内周面に内側軸受４の外輪４１が保持されることで、内側軸受４は、第１回転体３に設けられる。複数の内側軸受４が第１回転体３に設けられた状態において、凹部２３の奥側に位置する内側軸受４の外輪４１は、大径孔部２４と小径孔部２５との間の段部に接触しており、凹部２３の開口側に位置する内側軸受４の外輪４１は、本体部１９に設けられる押さえ部２０に接触している。押さえ部２０は、本体部１９の軸方向一端面にボルトなどで固定される。このようにして内側軸受４の外輪４１は、中空状の第１回転体３の内周面に保持される。 The plurality of inner bearings 4 are provided on the inner circumferential surface of the recess 23 of the first rotating body 3 while in contact with each other. At this time, the inner bearing 4 is provided on the first rotating body 3 by holding the outer ring 41 of the inner bearing 4 on the inner peripheral surface of the large diameter hole 24 of the recess 23 . In a state where a plurality of inner bearings 4 are provided in the first rotating body 3, the outer ring 41 of the inner bearing 4 located on the back side of the recess 23 is located at the step between the large diameter hole 24 and the small diameter hole 25. The outer ring 41 of the inner bearing 4 located on the opening side of the recess 23 is in contact with a presser portion 20 provided on the main body portion 19 . The holding portion 20 is fixed to one axial end surface of the main body portion 19 with a bolt or the like. In this way, the outer ring 41 of the inner bearing 4 is held on the inner peripheral surface of the hollow first rotating body 3.
　第２回転体５の小径部４０は、第２回転体５が第１回転体３の押さえ部２０の貫通孔２６を貫通した状態で、内側軸受４の内輪４３に保持される。この際、内側軸受４の内輪４３に、第２回転体５の小径部４０の外周面が固定される。第２回転体５が複数の内側軸受４に保持された状態において、凹部２３の開口側に位置する内側軸受４の内輪４３は、小径部４０と大径部３９との間の段部に接触しており、凹部２３の奥側に位置する内側軸受４の内輪４３は、第２回転体５の小径部４０に設けられた円環状の押さえ部４５に接触している。押さえ部４５は、小径部４０が差し込まれた状態で、小径部４０の軸方向他端部に固定される。このようにして第２回転体５は、内側軸受４の内輪に固定される。なお、第１実施形態では、内側軸受４及び外側軸受２は、内外二重に配置されている。 The small diameter portion 40 of the second rotating body 5 is held by the inner ring 43 of the inner bearing 4 with the second rotating body 5 passing through the through hole 26 of the holding portion 20 of the first rotating body 3. At this time, the outer peripheral surface of the small diameter portion 40 of the second rotating body 5 is fixed to the inner ring 43 of the inner bearing 4. In a state where the second rotating body 5 is held by the plurality of inner bearings 4, the inner ring 43 of the inner bearing 4 located on the opening side of the recess 23 contacts the step between the small diameter part 40 and the large diameter part 39. The inner ring 43 of the inner bearing 4 located on the back side of the recess 23 is in contact with an annular pressing portion 45 provided on the small diameter portion 40 of the second rotating body 5. The holding portion 45 is fixed to the other axial end of the small diameter portion 40 with the small diameter portion 40 inserted therein. In this way, the second rotating body 5 is fixed to the inner ring of the inner bearing 4. In addition, in the first embodiment, the inner bearing 4 and the outer bearing 2 are arranged in a double arrangement, inside and outside.
　第２回転体５は、軸方向他端側を残して、外周面に、雄ねじを備えている。第２回転体５は、リアプレート８に設けられたボールナット１１に、ねじ込まれている。ボールナット１１は、リアプレート８の貫通孔１３に回転不能に固定される。リアプレート８に設けられたボールナット１１にねじ込まれた第２回転体５は、リアプレート８の貫通孔１３を貫通している。すなわち、第２回転体５の軸方向一端部は、リアプレート８の貫通孔１３から突出している。第２回転体５の軸方向一端部は、リアプレート８に設けられた環状のロードセル４６を貫通している。ロードセル４６は、リアプレート８にボルトなどによって固定される。 The second rotating body 5 is provided with a male thread on the outer peripheral surface except for the other end in the axial direction. The second rotating body 5 is screwed into a ball nut 11 provided on the rear plate 8. The ball nut 11 is fixed non-rotatably in the through hole 13 of the rear plate 8. The second rotating body 5 screwed into a ball nut 11 provided on the rear plate 8 passes through a through hole 13 in the rear plate 8. That is, one axial end of the second rotating body 5 protrudes from the through hole 13 of the rear plate 8. One axial end of the second rotating body 5 passes through an annular load cell 46 provided on the rear plate 8. The load cell 46 is fixed to the rear plate 8 with bolts or the like.
　次に、射出成形機６の動作について説明する。射出成形機６は、計量混錬時に射出スクリュー１０のみが回転し、射出時に第２回転体５のみが回転する。そのため、射出成形機６は、射出スクリュー１０が固定された第１回転体３を回転させるモーター４７と、第２回転体５を回転させるモーター４８とを有している。モーター４７は、ハウジング１に設けられる。モーター４７の駆動軸には、駆動プーリ４９が固定される。モーター４７に設けられた駆動プーリ４９と第１回転体３の軸方向他端部に設けられた従動プーリ５０とには、ベルト５１が掛け回されている。モーター４８は、モーター４７とモーター４８との間に第１回転体３が位置するように、ハウジング１に設けられる。モーター４８の駆動軸には、駆動プーリ５２が固定される。モーター４８に設けられた駆動プーリ５２と第２回転体５に設けられた従動プーリ５３とには、ベルト５４が掛け回されている。 Next, the operation of the injection molding machine 6 will be explained. In the injection molding machine 6, only the injection screw 10 rotates during metering and kneading, and only the second rotating body 5 rotates during injection. Therefore, the injection molding machine 6 includes a motor 47 that rotates the first rotating body 3 to which the injection screw 10 is fixed, and a motor 48 that rotates the second rotating body 5. The motor 47 is provided in the housing 1. A drive pulley 49 is fixed to the drive shaft of the motor 47. A belt 51 is wound around a drive pulley 49 provided on the motor 47 and a driven pulley 50 provided at the other axial end of the first rotating body 3 . The motor 48 is provided in the housing 1 such that the first rotating body 3 is located between the motors 47 and 48. A drive pulley 52 is fixed to the drive shaft of the motor 48. A belt 54 is wound around a driving pulley 52 provided on the motor 48 and a driven pulley 53 provided on the second rotating body 5.
　このような構成であるので、計量混錬時には、モーター４８を停止した状態でモーター４７を駆動することで、射出スクリュー１０を回転させることができる。射出スクリュー１０を回転させることで、計量混錬り作業が行われ、射出シリンダー１２の先端に溶解樹脂が送り込まれる。射出時には、モーター４７を停止した状態でモーター４８を駆動することで、第２回転体５を回転させることができる。第２回転体５を回転させることで、ハウジング１を射出シリンダー１２側に移動させ、射出スクリュー１０を射出シリンダー１２内で移動させて射出することができる。 With such a configuration, during metering and kneading, the injection screw 10 can be rotated by driving the motor 47 while the motor 48 is stopped. By rotating the injection screw 10, a metering and kneading operation is performed, and the melted resin is fed into the tip of the injection cylinder 12. At the time of injection, the second rotating body 5 can be rotated by driving the motor 48 while the motor 47 is stopped. By rotating the second rotating body 5, the housing 1 can be moved toward the injection cylinder 12, and the injection screw 10 can be moved within the injection cylinder 12 to perform injection.
　以上のような射出成形機６に、第１実施形態に係る軸受の給脂構造が適用されている。軸受の給脂構造は、中空状のハウジング１と、ハウジング１の内周面に外輪が保持される外側軸受２と、外側軸受２の内輪に固定される中空状の第１回転体３と、第１回転体３の内周面に外輪が保持される内側軸受４と、内側軸受４の内輪に固定される第２回転体５とを備える。なお、ハウジング１、外側軸受２、第１回転体３、内側軸受４及び第２回転体５は、前述した構成を有している。 The bearing greasing structure according to the first embodiment is applied to the injection molding machine 6 as described above. The bearing greasing structure includes a hollow housing 1, an outer bearing 2 whose outer ring is held on the inner peripheral surface of the housing 1, and a hollow first rotating body 3 fixed to the inner ring of the outer bearing 2. It includes an inner bearing 4 whose outer ring is held on the inner peripheral surface of the first rotating body 3, and a second rotating body 5 which is fixed to the inner ring of the inner bearing 4. Note that the housing 1, the outer bearing 2, the first rotating body 3, the inner bearing 4, and the second rotating body 5 have the configurations described above.
　図１に示すように、ハウジング１は、内側軸受４に供給される潤滑剤が通される第１給脂路５５を有している。第１給脂路５５の上流側の開口は、ハウジング１の外部に開口している。第１給脂路５５の上流側の開口には、グリースニップルなどからなる給脂口５６が設けられる。給脂口５６には、潤滑剤を自動で給脂する給脂装置が接続される。第１給脂路５５の下流側は、ハウジング１と第１回転体３との間の封止された第１封止空間５７に連通される。第１封止空間５７は、ハウジング１の内周面と第１回転体３の外周面との間に位置する円筒状の隙間の開口部が封止部材で封止されることで、形成される。 As shown in FIG. 1, the housing 1 has a first lubricant passage 55 through which lubricant to be supplied to the inner bearing 4 passes. The upstream opening of the first greasing passage 55 opens to the outside of the housing 1 . A greasing port 56 consisting of a grease nipple or the like is provided at the opening on the upstream side of the first greasing path 55 . A greasing device that automatically supplies lubricant is connected to the greasing port 56 . The downstream side of the first greasing passage 55 communicates with a first sealed space 57 between the housing 1 and the first rotating body 3 . The first sealed space 57 is formed by sealing the opening of a cylindrical gap located between the inner circumferential surface of the housing 1 and the outer circumferential surface of the first rotating body 3 with a sealing member. Ru.
　封止部材は、第１軸受２７の外側に設けられる第１封止材５８と、第２軸受２８の外側に設けられる第２封止材５９とを有する。第１封止材５８は、外輪間座３１と内輪間座３４との間の円筒状隙間の軸方向一端部（図１における右側の端部）を封止する。第２封止材５９は、外輪間座３１と内輪間座３４との間の円筒状隙間の軸方向他端部を封止する。外輪間座３１と内輪間座３４との間の円筒状隙間が封止されることで、第１封止空間５７が形成される。第１封止材５８及び第２封止材５９で封止された円筒状隙間が第１封止空間５７の場合、第１給脂路５５の下流側は、外輪間座３１に設けられた外側貫通孔６０を介して、第１封止空間５７と連通される。 The sealing member includes a first sealing material 58 provided on the outside of the first bearing 27 and a second sealing material 59 provided on the outside of the second bearing 28. The first sealing material 58 seals one axial end (the right end in FIG. 1) of the cylindrical gap between the outer ring spacer 31 and the inner ring spacer 34. The second sealing material 59 seals the other end of the cylindrical gap between the outer ring spacer 31 and the inner ring spacer 34 in the axial direction. A first sealed space 57 is formed by sealing the cylindrical gap between the outer ring spacer 31 and the inner ring spacer 34. When the cylindrical gap sealed with the first sealing material 58 and the second sealing material 59 is the first sealed space 57, the downstream side of the first greasing passage 55 is provided in the outer ring spacer 31. It communicates with the first sealed space 57 via the outer through hole 60 .
　図１に示すように、第１回転体３は、第１給脂路５５から第１封止空間５７を介して流れてきた潤滑剤が通される第２給脂路６１を有する。第２給脂路６１の上流側は、第１封止空間５７に連通される。第１実施形態では、外輪間座３１と内輪間座３４との間の円筒状隙間が第１封止空間５７である。そのため、第２給脂路６１の上流側は、内輪間座３４に設けられた内側貫通孔６２を介して、第１封止空間５７に連通される。 As shown in FIG. 1, the first rotating body 3 has a second greasing passage 61 through which the lubricant flowing from the first greasing passage 55 through the first sealed space 57 passes. The upstream side of the second greasing passage 61 communicates with the first sealed space 57 . In the first embodiment, the cylindrical gap between the outer ring spacer 31 and the inner ring spacer 34 is the first sealed space 57. Therefore, the upstream side of the second greasing passage 61 is communicated with the first sealed space 57 via the inner through hole 62 provided in the inner ring spacer 34 .
　第２給脂路６１の下流側は、第１回転体３と第２回転体５との間の封止された第２封止空間６３に連通される。第２封止空間６３は、第１回転体３の内周面と第２回転体５の外周面との間に位置する円筒状の隙間の開口部を封止部材６４で、封止することによって形成される。封止部材６４は、凹部２３の開口側において、第１回転体３の内周面と第２回転体５の外周面との間の隙間を封止する。封止部材６４は、環状で、第１回転体３の押さえ部２０の内周面と第２回転体５の大径部３９の外周面との間に設けられる。封止部材６４は、従来公知のオイルシールとされるが、これに限定されない。このようにして形成された第２封止空間６３内には、内側軸受４が配置されている。 The downstream side of the second greasing passage 61 communicates with a second sealed space 63 between the first rotating body 3 and the second rotating body 5 . The second sealed space 63 is configured by sealing an opening of a cylindrical gap located between the inner circumferential surface of the first rotating body 3 and the outer circumferential surface of the second rotating body 5 with a sealing member 64. formed by. The sealing member 64 seals the gap between the inner circumferential surface of the first rotating body 3 and the outer circumferential surface of the second rotating body 5 on the opening side of the recess 23 . The sealing member 64 has an annular shape and is provided between the inner circumferential surface of the holding portion 20 of the first rotary body 3 and the outer circumferential surface of the large diameter portion 39 of the second rotary body 5 . The sealing member 64 is a conventionally known oil seal, but is not limited thereto. The inner bearing 4 is disposed within the second sealed space 63 thus formed.
　図１に示すように、第１回転体３は、ハウジング１を貫通しているので、ハウジング１から露出する露出面６５を有している。典型的には、露出面６５は、第１回転体３の押さえ部２０の外周面である。第１回転体３は、第２封止空間６３内の潤滑剤をハウジング１の外部に排出する排出路６６を有している。排出路６６は、例えば第１回転体３の押さえ部２０に設けられている。排出路６６は、内側軸受４を通った潤滑剤を排出する流路である。従って、排出路６６の上流側は、内側軸受４と封止部材６４との間の部分に連通される。排出路６６の出口は、露出面６５に開口している。 As shown in FIG. 1, the first rotating body 3 passes through the housing 1, so it has an exposed surface 65 exposed from the housing 1. Typically, the exposed surface 65 is the outer peripheral surface of the holding portion 20 of the first rotating body 3. The first rotating body 3 has a discharge path 66 that discharges the lubricant in the second sealed space 63 to the outside of the housing 1 . The discharge path 66 is provided, for example, in the holding portion 20 of the first rotating body 3. The discharge path 66 is a flow path through which the lubricant that has passed through the inner bearing 4 is discharged. Therefore, the upstream side of the discharge path 66 is communicated with the portion between the inner bearing 4 and the sealing member 64. The outlet of the discharge passage 66 is open to the exposed surface 65.
　第１実施形態の給脂構造の場合、給脂装置から供給される潤滑剤は、第１給脂路５５を通って第１封止空間５７に流れ込む。潤滑剤は、第１封止空間５７から第２給脂路６１を通って、第２封止空間６３内に流れ込む。これにより、潤滑剤は、内側軸受４に供給される。その後、潤滑剤は、排出路６６を通って、ハウジング１の外部に排出される。従って、第１実施形態の給脂構造によれば、簡易な構成で、内輪４３及び外輪４１が回転する内側軸受４に、射出成形機６の作動中に容易に給脂でき、特に、給脂の自動化にも適している。 In the case of the lubrication structure of the first embodiment, the lubricant supplied from the lubrication device flows into the first sealed space 57 through the first lubrication path 55. The lubricant flows from the first sealed space 57 into the second sealed space 63 through the second greasing path 61 . Thereby, lubricant is supplied to the inner bearing 4. Thereafter, the lubricant is discharged to the outside of the housing 1 through the discharge passage 66. Therefore, according to the greasing structure of the first embodiment, the inner bearing 4 on which the inner ring 43 and the outer ring 41 rotate can be easily lubricated during operation of the injection molding machine 6 with a simple configuration. It is also suitable for automation.
　第１実施形態の給脂構造の場合、排出路６６の出口は、露出面６５に開口している。従って、第１実施形態の給脂構造によれば、ハウジング１を介して潤滑剤を排出する構成と比較して、簡易な構成とすることができる。 In the case of the greasing structure of the first embodiment, the outlet of the discharge passage 66 is open to the exposed surface 65. Therefore, according to the lubricating structure of the first embodiment, the structure can be simpler than the structure in which lubricant is discharged through the housing 1.
　次に、図２を用いて、第１実施形態に係る軸受の給脂構造の変形例について説明する。なお、第１実施形態で付した符号と同じ符号を有する構成部品は、その作用を同じにするので以下、説明を省略することがある。本変形例の給脂構造は、複数の第１給脂路５５及び複数の第２給脂路６１を有している。 Next, a modification of the bearing greasing structure according to the first embodiment will be described using FIG. 2. Components having the same reference numerals as those in the first embodiment have the same functions, and therefore their descriptions may be omitted below. The greasing structure of this modification includes a plurality of first greasing passages 55 and a plurality of second greasing passages 61.
　図２に示すように、本変形例の給脂構造は、２つの第１給脂路５５，５５と、２つの第１給脂路５５，５５それぞれに対応する第２給脂路６１，６１とを有している。２つの第１給脂路５５，５５は、第１回転体３を挟んで対向する位置に設けられる。２つの第２給脂路６１，６１は、第１回転体３を挟んで対向する位置に設けられる。これに伴って、外輪間座３１に２つの外側貫通孔６０，６０が設けられるとともに、内輪間座３４に２つの内側貫通孔６２，６２が設けられる。 As shown in FIG. 2, the greasing structure of this modification includes two first greasing passages 55, 55 and second greasing passages 61, 61 corresponding to the two first greasing passages 55, 55, respectively. It has The two first greasing passages 55, 55 are provided at positions facing each other with the first rotating body 3 interposed therebetween. The two second greasing passages 61, 61 are provided at opposing positions with the first rotating body 3 in between. Accordingly, two outer through holes 60, 60 are provided in the outer ring spacer 31, and two inner through holes 62, 62 are provided in the inner ring spacer 34.
　本変形例の給脂構造の場合、潤滑剤は、２つの供給路から第２封止空間６３に供給される。従って、本変形例の給脂構造によれば、第２封止空間６３内に潤滑剤を効率的に供給することができる。 In the case of the lubricant supply structure of this modification, the lubricant is supplied to the second sealed space 63 from two supply paths. Therefore, according to the lubricating structure of this modification, lubricant can be efficiently supplied into the second sealed space 63.
　次に、図３を用いて、本発明の第２実施形態に係る軸受の給脂構造について説明する。なお、第１実施形態で付した符号と同じ符号を有する構成部品は、その作用を同じにするので以下、説明を省略することがある。第２実施形態の給脂構造は、第１封止空間５７の構成が第１実施形態と異なる。 Next, a bearing greasing structure according to a second embodiment of the present invention will be described using FIG. 3. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore descriptions thereof may be omitted below. The greasing structure of the second embodiment differs from the first embodiment in the configuration of the first sealed space 57.
　図３に示すように、ハウジング１の貫通孔１６は、段付き孔である。貫通孔１６は、貫通孔１６の軸方向一端側に位置する小径孔６７と、貫通孔１６の軸方向他端側に位置する大径孔６９とを有している。 As shown in FIG. 3, the through hole 16 of the housing 1 is a stepped hole. The through hole 16 has a small diameter hole 67 located at one axial end of the through hole 16 and a large diameter hole 69 located at the other axial end of the through hole 16 .
　複数の外側軸受２は、互いに接触した状態で、貫通孔１６の大径孔６９に設けられる。この際、大径孔６９の内周面に外側軸受２の外輪７９が保持されることで、外側軸受２は、ハウジング１に設けられる。複数の外側軸受２がハウジング１に設けられた状態において、貫通孔１６の軸方向一端側に位置する外側軸受２の外輪７９は、大径孔６９と小径孔６７との間の段部に接触しており、貫通孔１６の軸方向他端側に位置する外側軸受２の外輪７９は、ハウジング１に設けられる押さえ部３６に接触している。押さえ部３６は、厚板状で、ハウジング１の軸方向他端面にボルトなどで固定される。押さえ部３６は、厚さ方向に貫通する貫通孔３７を有している。貫通孔３７は、段付き孔である。 The plurality of outer bearings 2 are provided in the large diameter hole 69 of the through hole 16 in a state in which they are in contact with each other. At this time, the outer ring 79 of the outer bearing 2 is held on the inner peripheral surface of the large diameter hole 69, so that the outer bearing 2 is provided in the housing 1. In a state where a plurality of outer bearings 2 are provided in the housing 1, the outer ring 79 of the outer bearing 2 located on one axial end side of the through hole 16 contacts the step between the large diameter hole 69 and the small diameter hole 67. The outer ring 79 of the outer bearing 2 located on the other axial end side of the through hole 16 is in contact with the pressing portion 36 provided on the housing 1 . The holding portion 36 has a thick plate shape and is fixed to the other end surface of the housing 1 in the axial direction with a bolt or the like. The holding portion 36 has a through hole 37 that penetrates in the thickness direction. The through hole 37 is a stepped hole.
　第１回転体３の本体部１９は、外側軸受２の内輪８０に保持される。この際、外側軸受２の内輪８０に、本体部１９の小径部２２の外周面が固定される。第１回転体３が外側軸受２に保持された状態において、貫通孔１６の軸方向一端側に位置する外側軸受２の内輪８０は、大径部２１と小径部２２との間の段部に接触しており、貫通孔１６の軸方向他端側に位置する外側軸受２の内輪８０は、第１回転体３に設けられる円環状の押さえ部７２に接触している。 The main body portion 19 of the first rotating body 3 is held by the inner ring 80 of the outer bearing 2. At this time, the outer peripheral surface of the small diameter portion 22 of the main body portion 19 is fixed to the inner ring 80 of the outer bearing 2. In a state in which the first rotating body 3 is held by the outer bearing 2, the inner ring 80 of the outer bearing 2 located on one axial end side of the through hole 16 is located at the stepped portion between the large diameter portion 21 and the small diameter portion 22. The inner ring 80 of the outer bearing 2 , which is in contact with the other end of the through hole 16 in the axial direction, is in contact with an annular pressing portion 72 provided on the first rotating body 3 .
　第１封止空間５７は、ハウジング１と第１回転体３との間に位置する円筒状の隙間の軸方向一端側の開口を円環状の第３封止材７４で封止するとともに、ハウジング１と第１回転体３との間に位置する円筒状の隙間の軸方向他端側の開口を円環状の第４封止材７５で封止することで、形成される。第２実施形態では、第４封止材７５は、押さえ部３６の貫通孔３７の小径孔の内周面と第１回転体３の外周面との間の隙間を封止する。このような構成であるので、外側軸受２は、第１封止空間５７内に配置される。この際、貫通孔１６の軸方向一端側に位置する外側軸受２と第３封止材７４との間、及び貫通孔１６の軸方向他端側に位置する外側軸受２と第４封止材７５との間には、隙間が形成される。 The first sealed space 57 is configured by sealing an opening at one end in the axial direction of a cylindrical gap located between the housing 1 and the first rotating body 3 with an annular third sealing material 74. It is formed by sealing the opening on the other axial end side of the cylindrical gap located between the first rotation body 1 and the first rotating body 3 with an annular fourth sealing material 75. In the second embodiment, the fourth sealing material 75 seals the gap between the inner circumferential surface of the small diameter hole of the through hole 37 of the holding portion 36 and the outer circumferential surface of the first rotating body 3 . With such a configuration, the outer bearing 2 is arranged within the first sealed space 57. At this time, between the outer bearing 2 and the third sealing material 74 located on one end of the through hole 16 in the axial direction, and between the outer bearing 2 and the fourth sealing material located on the other end of the through hole 16 in the axial direction. A gap is formed between 75 and 75.
　このようにして外側軸受２は、第１封止空間５７の軸方向一端側の第１部分７６及び第１封止空間５７の軸方向他端側の第２部分７７を残すように、第１封止空間５７内に配置される。この場合、第１給脂路５５の下流側は、第１部分７６に連通される。第２給脂路６１の上流側は、第２部分７７に連通される。 In this way, the outer bearing 2 is constructed such that the first portion 76 on one axial end side of the first sealed space 57 and the second portion 77 on the other axial end side of the first sealed space 57 remain. It is arranged within the sealed space 57. In this case, the downstream side of the first greasing passage 55 is communicated with the first portion 76 . The upstream side of the second greasing passage 61 communicates with the second portion 77 .
　第２実施形態の給脂構造の場合、給脂装置から供給される潤滑剤は、第１給脂路５５を通って第１封止空間５７の第１部分７６に流れ込む。潤滑剤は、第１封止空間５７の第１部分７６から外側軸受２内を通って第２部分７７に流れる。潤滑剤は、第１封止空間５７の第２部分７７から第２給脂路６１を通って、第２封止空間６３内に流れ込む。これにより、潤滑剤は、内側軸受４に供給される。その後、潤滑剤は、排出路６６を通って、ハウジング１の外部に排出される。 In the case of the lubrication structure of the second embodiment, the lubricant supplied from the lubrication device flows into the first portion 76 of the first sealed space 57 through the first lubrication path 55. The lubricant flows from the first portion 76 of the first sealed space 57 through the outer bearing 2 to the second portion 77 . The lubricant flows from the second portion 77 of the first sealed space 57 into the second sealed space 63 through the second greasing passage 61 . Thereby, lubricant is supplied to the inner bearing 4. Thereafter, the lubricant is discharged to the outside of the housing 1 through the discharge passage 66.
　次に、図４を用いて、第２実施形態に係る軸受の給脂構造の変形例について説明する。なお、第１実施形態で付した符号と同じ符号を有する構成部品は、その作用を同じにするので以下、説明を省略することがある。本変形例の給脂構造は、複数の第１給脂路５５及び複数の第２給脂路６１を有している。 Next, a modification of the bearing greasing structure according to the second embodiment will be described using FIG. 4. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore descriptions thereof may be omitted below. The greasing structure of this modification includes a plurality of first greasing passages 55 and a plurality of second greasing passages 61.
　図４に示すように、本変形例の給脂構造は、２つの第１給脂路５５，５５と、２つの第１給脂路５５，５５それぞれに対応する第２給脂路６１，６１とを有している。２つの第１給脂路５５，５５は、第１回転体３を挟んで対向する位置に設けられる。２つの第２給脂路６１，６１は、第１回転体３を挟んで対向する位置に設けられる。 As shown in FIG. 4, the greasing structure of this modification includes two first greasing passages 55, 55 and second greasing passages 61, 61 corresponding to the two first greasing passages 55, 55, respectively. It has The two first greasing passages 55, 55 are provided at positions facing each other with the first rotating body 3 interposed therebetween. The two second greasing passages 61, 61 are provided at positions facing each other with the first rotating body 3 interposed therebetween.
　次に、図５を用いて、本発明の第３実施形態に係る軸受の給脂構造について説明する。なお、第１実施形態で付した符号と同じ符号を有する構成部品は、その作用を同じにするので以下、説明を省略することがある。第３実施形態の給脂構造は、第１封止空間５７の構成が第１実施形態と異なる。 Next, a bearing greasing structure according to a third embodiment of the present invention will be described using FIG. 5. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore descriptions thereof may be omitted below. The greasing structure of the third embodiment differs from the first embodiment in the configuration of the first sealed space 57.
　図５に示すように、円環状の第５封止材７８は、外側軸受２との間に隙間が形成されるように、ハウジング１と第１回転体３との間に設けられる。典型的には、第５封止材７８は、第１軸受２７との間に隙間が形成されるように設けられる。これにより、第１軸受２７の第１封止材５８と第５封止材７８との間に、第１封止空間５７が形成される。すなわち、第３実施形態では、外側軸受２に設けられる封止部材との間に隙間が形成されるように、第５封止材７８がハウジング１と第１回転体３との間に設けられる。このようにして外側軸受２は、第１封止空間５７に隣接して配置される。 As shown in FIG. 5, the annular fifth sealing member 78 is provided between the housing 1 and the first rotating body 3 so that a gap is formed between the fifth sealing member 78 and the outer bearing 2. Typically, the fifth sealing material 78 is provided so that a gap is formed between it and the first bearing 27 . As a result, a first sealed space 57 is formed between the first sealing material 58 and the fifth sealing material 78 of the first bearing 27. That is, in the third embodiment, the fifth sealing material 78 is provided between the housing 1 and the first rotating body 3 so that a gap is formed between the fifth sealing member and the sealing member provided on the outer bearing 2. . In this way, the outer bearing 2 is arranged adjacent to the first sealed space 57.
　なお、外側軸受２は、外輪間座３１及び内輪間座３４を有する軸受であるが、通常の玉軸受であってもよい。この場合、外側軸受には封止部材が設けられる。 Although the outer bearing 2 is a bearing having an outer ring spacer 31 and an inner ring spacer 34, it may be a normal ball bearing. In this case, the outer bearing is provided with a sealing member.
　次に、図６を用いて、第３実施形態に係る軸受の給脂構造の変形例について説明する。なお、第１実施形態で付した符号と同じ符号を有する構成部品は、その作用を同じにするので以下、説明を省略することがある。本変形例の給脂構造は、複数の第１給脂路５５及び複数の第２給脂路６１を有している。 Next, a modification of the bearing greasing structure according to the third embodiment will be described using FIG. 6. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore descriptions thereof may be omitted below. The greasing structure of this modification includes a plurality of first greasing passages 55 and a plurality of second greasing passages 61.
　図６に示すように、本変形例の給脂構造は、２つの第１給脂路５５，５５と、２つの第１給脂路５５，５５それぞれに対応する第２給脂路６１，６１とを有している。２つの第１給脂路５５，５５は、第１回転体３を挟んで対向する位置に設けられる。２つの第２給脂路６１，６１は、第１回転体３を挟んで対向する位置に設けられる。 As shown in FIG. 6, the greasing structure of this modification includes two first greasing passages 55, 55 and second greasing passages 61, 61 corresponding to the two first greasing passages 55, 55, respectively. It has The two first greasing passages 55, 55 are provided at positions facing each other with the first rotating body 3 interposed therebetween. The two second greasing passages 61, 61 are provided at positions facing each other with the first rotating body 3 interposed therebetween.
　なお、本発明は前記各実施形態及び前記変形例に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良は本発明に含まれる。 Note that the present invention is not limited to the above-described embodiments and the modified examples, and the present invention includes modifications and improvements within the range that can achieve the purpose of the present invention.
　例えば、前記各実施形態及び前記変形例において、第２給脂路６１の数は、第１給脂路５５の数よりも多く設けられてもよい。 For example, in each of the embodiments and the modified examples, the number of second greasing passages 61 may be greater than the number of first greasing passages 55.
　１　　ハウジング
　２　　外側軸受
　３　　第１回転体
　４　　内側軸受
　５　　第２回転体
２７　　第１軸受
２８　　第２軸受
２９　　第１軸受の外輪
３０　　第２軸受の外輪
３１　　外輪間座
３２　　第１軸受の内輪
３３　　第２軸受の内輪
３４　　内輪間座
５５　　第１給脂路
５７　　第１封止空間
５８　　第１封止材
５９　　第２封止材
６０　　外側貫通孔
６１　　第２給脂路
６２　　内側貫通孔
６３　　第２封止空間
６５　　露出面
６６　　排出路
７６　　第１部分
７７　　第２部分 1 Housing 2 Outer bearing 3 First rotating body 4 Inner bearing 5 Second rotating body 27 First bearing 28 Second bearing 29 Outer ring of the first bearing 30 Outer ring of the second bearing 31 Outer ring spacer 32 Inner ring of the first bearing 33 Inner ring 34 of two bearings Inner ring spacer 55 First greasing path 57 First sealing space 58 First sealing material 59 Second sealing material 60 Outer through hole 61 Second greasing path 62 Inner through hole 63 Second seal Stop space 65 Exposed surface 66 Discharge path 76 First part 77 Second part

Claims (5)

  1. 　中空状のハウジングと、
    　前記ハウジングの内周面に外輪が保持される外側軸受と、
    　中空状で、前記外側軸受の内輪に固定される第１回転体と、
    　前記第１回転体の内周面に外輪が保持される内側軸受と、
    　前記内側軸受の内輪に固定される第２回転体と、を備え、
    　前記ハウジングは、前記内側軸受に供給される潤滑剤が通される第１給脂路を有し、
    　前記第１給脂路の下流側は、前記ハウジングと前記第１回転体との間の封止された第１封止空間に連通され、
    　前記第１回転体は、上流側が前記第１封止空間に連通される第２給脂路を有し、
    　前記第２給脂路の下流側は、前記第１回転体と前記第２回転体との間の封止された第２封止空間に連通され、
    　前記第２封止空間内に前記内側軸受が配置される、軸受の給脂構造。     a hollow housing;
    an outer bearing having an outer ring held on the inner peripheral surface of the housing;
    a first rotating body that is hollow and fixed to the inner ring of the outer bearing;
    an inner bearing in which an outer ring is held on the inner circumferential surface of the first rotating body;
    a second rotating body fixed to the inner ring of the inner bearing,
    The housing has a first lubricant passage through which lubricant is supplied to the inner bearing,
    A downstream side of the first greasing passage communicates with a first sealed space between the housing and the first rotating body,
    The first rotating body has a second greasing passage whose upstream side communicates with the first sealed space,
    A downstream side of the second greasing passage communicates with a second sealed space between the first rotating body and the second rotating body,
    A bearing greasing structure, wherein the inner bearing is disposed within the second sealed space.
  2. 　前記第１回転体は、前記ハウジングから露出する露出面を有し、
    　前記露出面に、前記第２封止空間内の潤滑剤を前記ハウジングの外部に排出する排出路の出口が開口している、請求項１に記載の軸受の給脂構造。     The first rotating body has an exposed surface exposed from the housing,
    The bearing lubrication structure according to claim 1, wherein an outlet of a discharge passage for discharging the lubricant in the second sealed space to the outside of the housing is opened in the exposed surface.
  3. 　前記外側軸受は、隣接する第１軸受及び第２軸受と、前記第１軸受の外輪と前記第２軸受の外輪とを接続する外輪間座と、前記第１軸受の内輪と前記第２軸受の内輪とを接続する内輪間座と、を有し、
    　前記外輪間座と前記内輪間座との間の円筒状隙間の軸方向一端部が第１封止材によって封止されるとともに、前記円筒状隙間の軸方向他端部が第２封止材によって封止され、
    　前記第１封止材及び前記第２封止材で封止された前記円筒状隙間が前記第１封止空間とされており、
    　前記第１給脂路の下流側は、前記外輪間座に設けられた外側貫通孔を介して、前記第１封止空間に連通され、
    　前記第２給脂路の上流側は、前記内輪間座に設けられた内側貫通孔を介して、前記第１封止空間に連通される、請求項１又は２に記載の軸受の給脂構造。     The outer bearing includes an adjacent first bearing and a second bearing, an outer ring spacer connecting an outer ring of the first bearing and an outer ring of the second bearing, and an inner ring of the first bearing and an outer ring of the second bearing. an inner ring spacer connecting the inner ring;
    One axial end of the cylindrical gap between the outer ring spacer and the inner ring spacer is sealed with a first sealing material, and the other axial end of the cylindrical gap is sealed with a second sealing material. sealed by
    The cylindrical gap sealed with the first sealing material and the second sealing material is the first sealed space,
    A downstream side of the first greasing passage is communicated with the first sealed space via an outer through hole provided in the outer ring spacer,
    The bearing lubrication structure according to claim 1 or 2, wherein an upstream side of the second lubrication path is communicated with the first sealed space through an inner through hole provided in the inner ring spacer. .
  4. 　前記外側軸受は、前記第１封止空間の軸方向一端側の第１部分及び前記第１封止空間の軸方向他端側の第２部分を残すように、前記第１封止空間内に配置され、
    　前記第１給脂路の下流側は、前記第１部分に連通され、
    　前記第２給脂路の上流側は、前記第２部分に連通されている、請求項１又は２に記載の軸受の給脂構造。     The outer bearing is arranged within the first sealed space so as to leave a first portion on one axial end side of the first sealed space and a second portion on the other axial end side of the first sealed space. placed,
    A downstream side of the first greasing passage is communicated with the first portion,
    The bearing lubrication structure according to claim 1 or 2, wherein an upstream side of the second lubrication path is communicated with the second portion.
  5. 　前記外側軸受は、前記第１封止空間に隣接して配置されている、請求項１又は２に記載の軸受の給脂構造。 The bearing greasing structure according to claim 1 or 2, wherein the outer bearing is arranged adjacent to the first sealed space.
PCT/JP2022/029521 2022-08-01 2022-08-01 Bearing greasing structure WO2024028950A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57184222U (en) * 1981-05-20 1982-11-22
JPH06330935A (en) * 1993-05-24 1994-11-29 Mitsubishi Electric Corp Roll device
JP2004092842A (en) * 2002-09-03 2004-03-25 Sumitomo Heavy Ind Ltd Lubricating device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57184222U (en) * 1981-05-20 1982-11-22
JPH06330935A (en) * 1993-05-24 1994-11-29 Mitsubishi Electric Corp Roll device
JP2004092842A (en) * 2002-09-03 2004-03-25 Sumitomo Heavy Ind Ltd Lubricating device

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