JP2017037828A - Rotary connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a pole retainer from inclining due to clearance of bearings attached to the opposite ends of the pole retainer during rotation, to cause occurrence of twist in the retainer plates at the opposite ends of the pole retainer, in a structure where a pair of retainers are attached to the opposite ends of a plurality of retainers so as to sandwich them from the opposite sides, in a rotary connector including a shaft body disposed in the hollow section of an outer peripheral member coaxially with the inner peripheral surface, and a plurality of roller collectors disposed to rotate freely so as to perform planet movement while deforming elastically in the radial direction between the shaft body and outer peripheral member.SOLUTION: In a rotary connector, A support is disposed between retainer plates attached, via bearings, for supporting the opposite ends of a pole retainer, and a rotary connector fixes the support and the retainer plates at the opposite ends.SELECTED DRAWING: Figure 5

Description

  The present invention includes an outer peripheral member having a circular inner peripheral surface, a shaft that is relatively rotatable with respect to the outer peripheral member, and that is disposed coaxially with the inner peripheral surface in a hollow portion of the outer peripheral member; A thin-cylindrical roller current collector that is rotatably disposed with elastic deformation in the radial direction between the member and the shaft body, and the outer peripheral member and the shaft body are electrically connected via the roller current collector. Relates to rotary connectors.

  As a structure for electrically connecting relatively rotating members and supplying a current between them, a roller-collector type rotary connector has been devised.

  In the roller collector type rotary connector, when the outer peripheral member and the shaft body rotate relatively, the roller current collector performs a so-called planetary motion that revolves while rotating in an annular space between the outer peripheral member and the shaft body.

  At this time, as in Patent Document 1, in order to prevent contact between the roller current collectors during rotation, a cylindrical retainer (hereinafter referred to as a pole retainer) extending in parallel with the rotation shaft is disposed in the roller current collector hollow portion. What was set up has been devised.

JP 2012-169155 A

  In the structure of Patent Document 1, a pair of disk donut-shaped retainer plates (referred to as roller holders in Patent Document 1) so as to sandwich a plurality of pole retainers from both sides via a bearing provided at the end of the pole retainer. ). However, when rotating, there is a problem that the pole retainer is inclined from the rotary shaft of the rotary connector due to the clearance of the bearing itself that is attached to both ends of the pole retainer and inserted into the retainer plate. It may be the cause of the occurrence.

In order to solve the above problems, the present invention provides the following rotary connector.
(1) An outer peripheral member having a circular inner peripheral surface, a shaft that is relatively rotatable with respect to the outer peripheral member, and is disposed coaxially with the inner peripheral surface in a hollow portion of the outer peripheral member; A plurality of roller current collectors rotatably arranged so as to make a planetary motion while being elastically deformed in a radial direction between the shaft body and the outer circumferential member, and the outer circumferential member and the shaft body via the roller current collector And a pole retainer is disposed in the hollow portion of the roller current collector, and the plurality of pole retainers are sandwiched from both sides at both ends of the plurality of pole retainers. A rotary connector in which a pair of retainer plates is attached, and the retainer plates are fixed with struts (having an integral structure).
(2) The rotary connector according to claim 1, wherein the support column has two retainer plates fixed thereto by screwing.

  According to the present invention, since the retainer plates at both ends of the pole retainer have a solid integrated structure via the support columns, it is possible to prevent the retainer poles sandwiched between the retainer plates from being inclined, thereby reducing the rotational load. As a result, smoother rotation can be obtained and generation of wear powder can be prevented.

Basic structure of roller-collector type rotary connector A-A 'sectional view of FIG. Conventional rotary connector structure A-A 'sectional view of FIG. Rotary connector structure diagram according to the present invention A-A 'sectional view of FIG. Retainer plate perspective view Detail of pole retainer (A) The state of the conventional pole retainer and the retainer plate when stationary (b) The state of the conventional pole retainer and the retainer plate when rotating (c) The state of the pole retainer and the retainer plate according to the present invention when rotating

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

  First, the basic structure of the roller-collecting rotary connector will be described with reference to FIGS.

  An outer peripheral member 1 having a circular inner peripheral surface, a shaft 2 that is relatively rotatable with respect to the outer peripheral member 1 and is disposed coaxially with the inner peripheral surface in a hollow portion of the outer peripheral member 1, and an outer periphery A thin-walled cylindrical roller current collector 3 is provided between the member 1 and the shaft body 2 so as to be rotatable with elastic deformation in the radial direction, and the outer peripheral member 1 and the shaft body are provided via the roller current collector 3. 2 are electrically connected.

  When the outer circumferential member 1 and the shaft body 2 rotate relatively, the roller current collector 3 performs a so-called planetary motion that revolves while rotating in an annular space between the outer circumferential member 1 and the shaft body 2.

  Here, a bearing 4 is fitted to the bottom surface of the outer peripheral member 1, the shaft body 2 is fitted to the bearing 4, and the bearing 6 and the shaft body 2 fitted to the bearing holder 5 are fitted, and the screw 7. Thus, the outer peripheral member 1 and the shaft body 2 and the bearing holder 5 are integrally formed.

  Next, the structure of a conventional rotary connector will be described with reference to FIGS.

  In order to prevent the roller current collectors 3 from coming into contact with each other due to uncontrollable slip during planetary movement, the roller current collectors 3 extend parallel to the shaft body 2 in the hollow portions of the roller current collectors 3 as shown in FIGS. An existing cylindrical pole retainer 8 is disposed.

  Further, a retainer plate 9 is attached to both ends of the pole retainer 8 via bearings 10 in order to maintain the spacing between the pole retainers 8.

  Since the pole retainer 8 is supported at both ends by bearings 10 attached to the retainer plate 9, the pole retainer 8 can be used even when the hollow portion of the roller current collector 3 contacts the outer peripheral surface of the pole retainer 8. It smoothly rotates in the same direction as the rotation direction of the electrons 3.

  The retainer plate 9 is supported by the bearing 11 and the bearing 12 attached to the bearing holder 13 and the bearing holder 14 because the retainer plate 9 needs to rotate at the revolution speed of the roller current collector 3 because the pole retainer 8 is attached. .

  However, in the above-described structure, the retainer plates 9 at both ends are not fixed to each other with respect to the rotation direction, and when rotated, the pole retainer 8 is inclined due to the clearance of the bearing 10 itself, and the retainer plates 9 at both ends are twisted. To do.

  FIG. 9A shows a state in which the conventional pole retainer and the retainer plate are stationary. However, as shown in FIG. 9B, the pole retainer is inclined as shown in FIG. 9B, and the retainer plates at both ends are twisted. .

  Here, the structure for preventing the inclination of the pole retainer 8 according to the present invention will be described with reference to FIG. 5, FIG. 6, FIG. 7, FIG.

  As shown in FIG. 5, between the two retainer plates 9 attached to both ends of the pole retainer 8, a support column 16 for sandwiching the retainer plates 9 to each other into a solid and integral structure is sandwiched, and the support column is interposed via the retainer plate 9. By screwing 16 from both sides, the two retainer plates 9 are made to be a solid and integral structure.

  At this time, the length of the column 16 in the axial direction is set slightly longer than the dimension L between the flange portions 17 shown in FIG. 8 for restricting the fitting depth of the pole retainer 8 to the bearing 10, and the column 16 and the retainer plate. When the screw 9 is tightened, the bearing 10 is prevented from being loaded.

  Furthermore, the support 16 can be screwed from both sides via the retainer plate 9 and the head of the screw and the end surfaces of the bearings 11 and 12 can be pressed without any gaps to prevent loosening of the screw. .

  FIG. 9C shows a state in which the support 16 is screwed from both sides via the retainer plate 9 at rest and at rotation.

DESCRIPTION OF SYMBOLS 1 Outer peripheral member 2 Shaft body 3 Roller current collector 4, 6, 10, 11, 12 Bearing 5, 13, 14 Bearing holder 7 Screw 8 Pole retainer 9 Retainer plate 15 Bearing fitting hole 16 Strut 17 Brim

Claims (3)

  An outer peripheral member having a circular inner peripheral surface, a shaft that is rotatable relative to the outer peripheral member, and is disposed coaxially with the inner peripheral surface in a hollow portion of the outer peripheral member, and the shaft And a plurality of roller current collectors rotatably arranged so as to make a planetary motion while being elastically deformed in the radial direction between the outer circumferential members, and electrically connecting the outer circumferential member and the shaft body via the roller current collectors. A pole retainer is disposed in the hollow portion of the roller current collector, and a pair of pole retainers are sandwiched from both sides at both ends of the plurality of pole retainers. The rotary connector which fixed the space | interval between the said retainer plates with the support | pillar in the structure where the retainer plate is attached.   The rotary connector according to claim 1, wherein one or both of the retainer plates are fixed by screwing the support column.   2. The rotary connector according to claim 1, wherein the male screw for fixing the retainer plate and the support has a structure in which an end face of the bearing is pressed against the head of the male screw.

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