JP2010036790A - Rotary seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary seat comprising a fixed member provided at a floor side and having a circumferential surface, a seat provided rotatably to the fixed member around the center axis of the circumferential surface of the fixed member, and a liner provided on the seat and having a surface opposite to the circumferential surface of the fixed member via an oil film in which an operational force for rotating the seat is small, and abnormal noise is not generated. <P>SOLUTION: An oil groove 23a along the circumferential direction of a rotary shaft 13 is formed at a face opposite to a circumferential surface 13c of the rotary shaft 13 which is a fixed member of a liner 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a fixing member provided on the floor side and having a circumferential surface, a sheet rotatably provided with respect to the fixing member around a central axis of the circumferential surface of the fixing member, and the sheet And a liner having a surface facing the circumferential surface of the fixing member via an oil film.

FIG. 8 is a diagram for explaining a conventional rotating mechanism of a rotating sheet. In the figure, a circumferential surface 1a is formed on the fixing member 1 provided on the floor side.
The upper base 3 which is a member on the seat side and the reinforcement 5 attached to the upper base 3 rotate around the central axis of the circumferential surface 1a of the fixing member 1 via the ball 7 with respect to the fixing member 1. It is provided as possible.

Further, the reinforcement 5 is provided with a liner 9 having a fixing member facing surface 9a facing the circumferential surface 1a of the fixing member 1 via an oil film (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-2222059 (FIG. 1)

  However, since the circumferential surface 1a of the fixing member 1 having the configuration shown in FIG. 8 and the fixing member facing surface 9a of the liner 9 are vertical surfaces, the oil film is easily cut off, and the operating force for rotating the sheet increases, There is a problem that occurs.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotating sheet that has a small operating force for rotating the sheet and does not generate abnormal noise.

  The invention according to claim 1 includes a fixing member provided on the floor side and having a circumferential surface, and a circumferential surface facing the circumferential surface of the fixing member through a space, and the circumference of the fixing member A sheet provided rotatably with respect to the fixing member around a central axis of the surface, and provided on one of the fixing member and the sheet, and the circumference of the other of the fixing member and the sheet A rotating sheet having a surface facing the surface through an oil film, the fixing member, the surface of the liner facing the circumferential surface provided on the other of the sheets, the fixing member, An oil groove is provided along the circumferential direction of a circumferential surface provided on the other of the sheets.

  According to a second aspect of the present invention, there is provided a circumferential surface provided on the other of the fixing member and the sheet on a surface of the liner facing the circumferential surface provided on the other of the fixing member and the sheet. A plurality of projecting portions that protrude toward the surface and have a tip surface facing the circumferential surface provided on the other of the fixing member and the sheet via an oil film, and the oil groove The rotating sheet according to claim 1, wherein the rotating sheet is provided on a front end surface.

  The invention according to claim 3 is the fixing member of the protruding portion, the end side in the circumferential direction of the circumferential surface provided on the other of the sheets, the fixing member as it goes to the end portion, The rotating sheet according to claim 2, wherein the sheet is a surface having a wider distance from a circumferential surface provided on the other of the sheets.

The invention according to claim 4 is the rotating seat according to claim 2 or 3, wherein the depth of the oil groove is the same as the height of the protruding portion.
According to a fifth aspect of the present invention, in the rotating sheet according to any one of the first to fourth aspects, an oil extrusion portion in which a cross-sectional area of the groove is reduced is provided in a part of the oil groove. is there.

  According to the invention of claim 1-5, the fixing member is provided on the other of the sheets on the surface of the liner facing the circumferential surface provided on the other of the sheets. By providing an oil groove along the circumferential direction of the circumferential surface formed, a circumferential surface provided on the other of the fixing member and the sheet, and a liner facing the circumferential surface The oil film is not cut off from the surface, the operating force for rotating the sheet is small, and no abnormal noise is generated.

  According to the invention which concerns on Claim 2, it was provided in the other of the said fixing member and the said sheet | seat on the surface of the said liner facing the circumferential surface provided in the other of the said fixing member and the said sheet | seat. A plurality of projecting portions projecting toward a circumferential surface and having tip surfaces facing the circumferential surface provided on the other of the fixing member and the sheet via an oil film are provided, and the oil groove By being provided on the front end surface of the portion, the contact area between the fixing member and the liner is reduced, and the operating force for rotating the sheet is reduced.

  The oil groove is a circumferential surface provided on the other of the fixing member and the sheet, and a surface of the liner facing the circumferential surface by being provided on the front end surface of the protruding portion. There is no oil film breakage between the front end surface, the operation force for rotating the sheet is small, and no abnormal noise is generated.

  According to the invention of claim 3, the end portion in the circumferential direction of the circumferential surface provided on the other of the fixing member and the sheet of the projecting portion is fixed as the end portion goes to the end portion. The circumferential surface provided on the other end of the fixing member and the sheet by the end surface side of the projecting part by being a surface that is widened with the circumferential surface provided on the other of the member and the sheet There will be no catch on the surface. Further, of the portion of the liner facing the circumferential surface provided on the other of the fixing member and the sheet, the portion other than the protruding portion, and the circle provided on the other of the fixing member and the sheet Oil between the peripheral surface easily moves to the front end surface of the protruding portion, so that the oil is not exhausted, the operating force for rotating the seat is small, and noise is not generated.

  According to a fourth aspect of the invention, the depth of the oil groove is the same as the height of the protruding portion, so that the portion of the liner facing the circumferential surface provided on the other of the fixing member and the sheet Among them, the oil between the portion other than the protruding portion and the circumferential surface provided on the other of the fixing member and the sheet is likely to move to the oil groove of the protruding portion, and the oil runs out. The operating force for rotating the seat is small, and no abnormal noise is generated.

  According to the invention which concerns on Claim 5, it provided in the other of the said fixing member and the said sheet | seat by providing the oil extrusion part in which the cross-sectional area of a groove | channel where a groove | channel becomes small in a part of said oil groove An operation in which oil is pushed out from the oil groove between the circumferential surface and the surface of the liner facing the circumferential surface provided on the other of the fixing member and the sheet, so that the oil runs out and the sheet is rotated. Power is small and no abnormal noise is generated.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
Initially, the whole structure of the rotation sheet | seat of this embodiment is demonstrated using FIG. FIG. 2 is an exploded perspective view of the rotating sheet of this embodiment.

  In the figure, a rotating shaft (fixed member) 13 is provided on a leg base 11 fixed to the floor side. The rotating shaft 13 includes a disk-shaped base portion 13a attached to the base 11 and a columnar column portion 13b provided on the base portion 13a and having a diameter smaller than that of the base portion 13a.

  A turntable 17 is provided on the lower surface of the base frame 15 that supports the seat cushion. At the bottom of the turntable 17, a cylindrical portion 13b of the rotary shaft 13 is inserted, and a hole 19 is formed in which the inner wall surface 19a faces the circumferential surface 13c of the cylindrical portion 13b of the rotary shaft 13 through a space. .

A screw seat 21 is attached to the distal end surface of the cylindrical portion 13b of the rotary shaft 13 that has passed through the hole 19.
The turntable 17 on the seat side is provided with a resin liner 23 having a surface facing the circumferential surface 13c of the cylindrical portion 13b of the rotating shaft 13 which is a fixed member via an oil film such as grease. The liner 23 according to this embodiment includes an upper liner 25 and a lower liner 27.

  With such a configuration, the base frame 15 of the seat side member can be rotated with respect to the rotary shaft 13 around the central axis of the circumferential surface 13c of the cylindrical portion 13b of the rotary shaft 13 which is a floor side fixing member. Is provided.

  Next, the rotation shaft 13, the liner 23, the turntable 17, and the screw seat 21 will be described in detail with reference to FIGS. FIG. 1 is a diagram for explaining the inventive portion of the present invention, and is an enlarged view of a portion C in FIG. 4, FIG. 3 is a view in the direction of arrow A in FIG. 2 with the underframe 15 removed, and FIG. It is sectional drawing in a cutting line BB.

  In these drawings, as particularly shown in FIG. 1, the diameter of the hole 19 of the turntable 17 is set to be larger than the diameter of the column portion 13b of the rotating shaft 13 and smaller than the diameter of the base portion 13a. Further, the outer diameter of the screw seat 21 is set to be substantially the same as the outer diameter of the base portion 13 a of the rotating shaft 13.

  The upper liner 25 of the liner 23 includes an annular base portion 25a and a standing wall portion 25b. The base portion 25a faces the lower surface of the screw seat 21 via an oil film, and the standing wall portion 25b is provided along the inner periphery of the base portion 25a and extends in a direction substantially perpendicular to the base portion 25a. It faces the circumferential surface 13c of the portion 13b via an oil film.

  Further, the lower liner 27 of the liner 23 includes an annular base portion 27a and a standing wall portion 27b. The base portion 27a faces the upper surface of the base portion 13a of the rotating shaft 13 via an oil film, and the standing wall portion 27b is provided along the inner periphery of the base portion 27a and extends in a substantially vertical direction with respect to the base portion 27a. It faces the circumferential surface 13c of the cylindrical portion 13b through an oil film. Further, the dimensions of the standing wall portion 25b of the upper liner 25 and the standing wall portion 27b of the lower liner 27 are set so that the tip surface of the standing wall portion 25b of the upper liner 25 and the tip surface of the standing wall portion 27b of the lower liner 27 face each other. Has been.

As described above, the liner 23 of the present embodiment, which is provided on the turntable 17 on the seat side and includes the upper liner 25 and the lower liner 27, has a circumferential surface 13 c of the rotating shaft 13,
The lower surface of the screw seat 21 provided on the rotating shaft 13 and the upper surface of the base portion 13a of the rotating shaft 13 are opposed to each other through an oil film.

  More specifically, the base portion 25a of the upper liner 25 and the base portion 27a of the lower liner 27 include a screw seat 21 provided on the rotating shaft 13 and a base portion of the rotating shaft 13 in the thrust direction (rotating shaft direction) of the rotating sheet. The upright wall portion 25b of the upper liner 25 and the upright wall portion 27b of the lower liner 27 serve as surfaces for transmitting the radial load (radial direction) of the rotating seat to the cylindrical portion 13b of the rotating shaft 13. ing.

  An oil groove 25d along the circumferential direction of the cylindrical portion 13b of the rotating shaft 13 is formed on the surface facing the circumferential surface 13c of the cylindrical portion 13b of the rotating shaft 13 on the distal end side of the standing wall portion 25b of the upper liner 25. Has been. Similarly, an oil groove along the circumferential direction of the cylindrical portion 13b of the rotating shaft 13 is formed on the surface facing the circumferential surface 13c of the cylindrical portion 13b of the rotating shaft 13 on the distal end side of the standing wall portion 27b of the lower liner 27. 27d is formed. When the upper liner 25 and the lower liner 27 are assembled, the oil groove 25d and the oil groove 27d are integrated, the cross-sectional shape is a split circle, and along the circumferential direction of the cylindrical portion 13b of the rotating shaft 13. It becomes the oil groove 23a.

  An oil groove 25 c is provided on the surface of the base portion 25 a of the upper liner 25 facing the lower surface of the screw seat 21 along the circumferential direction of the cylindrical portion 13 b of the rotating shaft 13. Further, an oil groove 27 c is provided on the surface of the base portion 27 a of the lower liner 27 facing the upper surface of the base portion 13 a of the rotating shaft 13 along the circumferential direction of the cylindrical portion 13 b of the rotating shaft 13.

Here, the liner 23 will be described in more detail with reference to FIGS. 5 is a plan view of the liner, FIG. 6 is an enlarged view of a portion D in FIG. 5, and FIG. 7 is a view taken in the direction of arrow E in FIG.
As shown in FIGS. 5 and 6, the surface of the rotating shaft 13 that is a fixing member of the liner 23 faces the circumferential surface 13 c of the rotating shaft 13 and protrudes toward the circumferential surface 13 c of the rotating shaft 13. A plurality of projecting portions 23c having tip surfaces facing the circumferential surface 13c via the oil film are provided. And the oil groove 23a is provided in the front end surface of the protrusion part 23c.

Further, the end portions T and T ′ in the circumferential direction of the cylindrical portion 13b of the rotating shaft 13 of the protruding portion 23c are surfaces (slopes) that increase in distance from the circumferential surface 13c of the rotating shaft 13 toward the end portion. It has become. still,
Another curved surface may be used as the surface in which the distance from the circumferential surface 13c of the rotating shaft 13 increases toward the end.

  Furthermore, as shown in FIG. 6, the depth of the oil groove 23a is the same as the height of the protruding portion 23c. Therefore, among the surfaces facing the circumferential surface 13c of the rotating shaft 13 that is the fixing member of the liner 23, the surface other than the protruding portion and the bottom surface of the oil groove 23a of the protruding portion 23c are flush with each other. ing.

Further, as shown in FIG. 7, an oil extrusion portion 23d is provided in a part of the oil groove 23a so that the width of the oil groove 23a is reduced and the cross-sectional area is reduced.
According to such a configuration, the following effects can be obtained.

 (1) By providing the liner 23 with an oil groove 23a along the circumferential direction of the cylindrical portion 13b of the rotating shaft 13 as a fixed member, the circumferential surface 13c of the cylindrical portion 13b of the rotating shaft 13; The oil film is not cut between the cylindrical portion 13b of the cylindrical portion 13b of the rotating shaft 13 of the liner 23, the operating force for rotating the sheet is small, and no abnormal noise is generated.

 (2) The surface facing the circumferential surface 13c of the rotating shaft 13 which is a fixing member of the liner 23 protrudes toward the circumferential surface 13c of the rotating shaft 13, and passes through the circumferential surface 13c of the rotating shaft 13 and the oil film. By providing a plurality of protrusions 23c having opposite end surfaces, the contact area between the circumferential surface 13c of the rotating shaft 13 and the liner 23 is reduced, and the operating force for rotating the sheet is reduced.

 (3) The oil groove 23a is provided on the tip surface of the protruding portion 23c, so that the circumferential surface 13c of the cylindrical portion 13b of the rotating shaft 13 and the circumferential surface of the cylindrical portion 13b of the rotating shaft 13 of the liner 23 are provided. The oil film is not cut between the surface facing 13c, the operating force for rotating the sheet is small, and no abnormal noise is generated.

 (4) The end portions T and T ′ in the circumferential direction of the cylindrical portion 13b of the rotating shaft 13 of the projecting portion 23c are surfaces where the distance from the circumferential surface 13c of the rotating shaft 13 increases toward the end portion. Thus, the end portions T and T ′ of the projecting portion 23 c and the circumferential surface 13 c of the cylindrical portion 13 b of the rotating shaft 13 are not caught. Of the portion of the liner 23 that faces the circumferential surface 13c of the cylindrical portion 13b of the rotating shaft 13, a portion other than the protruding portion 23c and a surface that faces the circumferential surface 13c of the cylindrical portion 13b of the rotating shaft 13 The oil in between becomes easy to move to the front end surface of the protruding portion 23c, the oil runs out, the operating force for rotating the seat is small, and the generation of abnormal noise is eliminated.

 (5) The depth of the oil groove 23a is the same as the height of the protruding portion 23c, so that the portion of the liner 23 facing the circumferential surface 13c of the cylindrical portion 13b of the rotating shaft 13 other than the protruding portion 23c. The oil between the portion and the circumferential surface 13c of the cylindrical portion 13b of the rotating shaft 13 becomes easy to move to the oil groove 23a of the protruding portion 23c, so that the oil does not run out and the operating force for rotating the seat is small. No abnormal noise is generated.

 (6) A part of the oil groove 23a is provided with an oil extrusion part 23d having a small cross-sectional area of the groove so that the circumferential surface 13c of the cylindrical part 13b of the rotating shaft 13 is opposed to the circumferential surface 13c. Oil is pushed out from the oil groove between the surface of the projecting portion 23c of the liner 23, and the oil does not run out, the operating force for rotating the seat is small, and no abnormal noise is generated.

The present invention is not limited to the above embodiment. For example, the oil extrusion portion is formed by narrowing the width of the oil groove 23a, but the depth of the groove may be reduced.
Further, in the above embodiment, the example in which the liner 23 is provided on the turntable 17 has been described, but the liner may be provided on the rotary shaft 13 side.

It is a figure explaining the invention part of this invention, and is an enlarged view of the C section of FIG. It is a disassembled perspective view of the rotation sheet of an example. In FIG. 2, it is an A direction arrow line view in the state which removed the base frame 15. FIG. FIG. 4 is a cross-sectional view taken along a cutting line BB in FIG. 3. It is a top view of a liner. FIG. 6 is an enlarged view of a portion D in FIG. 5. FIG. 7 is a view taken in the direction of arrow E in FIG. 6. It is a figure explaining the rotation mechanism of the conventional rotating sheet.

Explanation of symbols

13 Rotating shaft 13b Cylindrical portion 13c Circumferential surface 23 Liner 23a Oil groove

Claims (5)

A fixing member provided on the floor side and having a circumferential surface;
A sheet that has a circumferential surface that opposes the circumferential surface of the fixing member via a space, and is provided so as to be rotatable with respect to the fixing member around a central axis of the circumferential surface of the fixing member;
A liner provided on one of the fixing member and the sheet, and having a surface facing the other circumferential surface of the fixing member and the sheet through an oil film;
In a rotating sheet having
The surface of the liner facing the circumferential surface provided on the other of the fixing member and the sheet is along the circumferential direction of the circumferential surface provided on the other of the fixing member and the sheet. A rotating sheet characterized in that an oil groove is provided. On the surface of the liner facing the circumferential surface provided on the other of the fixing member and the sheet,
The fixing member protrudes toward a circumferential surface provided on the other of the sheets, and has a front end surface facing the circumferential surface provided on the other of the fixing member and the sheet via an oil film. Multiple protrusions are provided,
The rotating sheet according to claim 1, wherein the oil groove is provided on a front end surface of the protruding portion. The fixing member of the protruding portion, the circumferential end portion side of the circumferential surface provided on the other of the sheets,
The rotating sheet according to claim 2, wherein the distance between the fixing member and a circumferential surface provided on the other of the sheets increases toward the end.   The rotary seat according to claim 2 or 3, wherein the depth of the oil groove is the same as the height of the protruding portion.   The rotating sheet according to any one of claims 1 to 4, wherein an oil extrusion portion having a small cross-sectional area of the groove is provided in a part of the oil groove.

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