US20020134231A1 - Hemispherical shoe - Google Patents

Hemispherical shoe Download PDF

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Publication number
US20020134231A1
US20020134231A1 US10/070,030 US7003001A US2002134231A1 US 20020134231 A1 US20020134231 A1 US 20020134231A1 US 7003001 A US7003001 A US 7003001A US 2002134231 A1 US2002134231 A1 US 2002134231A1
Authority
US
United States
Prior art keywords
semi
spherical
convex
shoe
sliding
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US10/070,030
Other languages
English (en)
Inventor
Seiichi Nakayama
Yukihito Takehara
Shogo Muramatsu
Akira Takenaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taiho Kogyo Co Ltd
Original Assignee
Taiho Kogyo Co Ltd
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 Taiho Kogyo Co Ltd filed Critical Taiho Kogyo Co Ltd
Assigned to TAIHO KOGYO CO., LTD. reassignment TAIHO KOGYO CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MURAMATSU, SHOGO, NAKAYAMA, SEIICHI, TAKEHARA, YUKIHITO, TAKENAKA, AKIRA
Publication of US20020134231A1 publication Critical patent/US20020134231A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
    • F04B27/0878—Pistons
    • F04B27/0886—Piston shoes

Definitions

  • the invention relates to a semi-spherical shoe, and in particular, to a semi-spherical shoe which is preferred to be interposed between a piston and a swash plate of a swash plate compressor, for example.
  • a semi-spherical shoe having a semi-spherical convex surface which is fitted into a semi-spherical recess formed in a piston and an end face which is disposed in sliding contact with a flat surface of a swash plate is known in the art.
  • a semi-spherical shoe in which the convex semi-spherical surface has a diameter R 2 which is chosen by a given amount less than the diameter R 1 of the semi-spherical recess formed in the piston is also known in the art (see, for example, Japanese Utility Model Publication No. 5, 259/1995).
  • the disclosed semi-spherical shoe includes a semi-spherical recess and a convex semi-spherical surface having sizes chosen in the manner mentioned above, and this allows a clearance to be maintained between an inlet region of the semi-spherical recess in the piston and an opposing convex semi-spherical surface of the shoe.
  • This allows a lubricant oil to be introduced into the clearance through the inlet of the semispherical recess, and allows the lubricant oil to be supplied into sliding portions of the convex semi-spherical surface and the semi-spherical recess as the shoe rocks in accordance with the angle of the swash plate.
  • a top region of the convex semi-spherical surface is notched to define a flat surface, thus forming a space, which is arcuate in section, between the flat surface and the opposing top of the semi-spherical recess. It is intended that the space serves as a reservoir of lubricant oil, thus allowing the latter to be supplied into the sliding portions of the convex semi-spherical surface and the semi-spherical recess.
  • the flat surface on the top of the convex semi-spherical surface has its edge formed at an acute angle, thus greatly reducing the clearance left between the edge of the flat surface and the semi-spherical recess.
  • This results in a disadvantage that the lubricant oil stored in the space formed between the flat surface on the convex semi-spherical surface and the top of the semi-spherical recess of the semi-spherical shoe is less susceptible to be conveyed into the sliding portions of the convex semi-spherical surface and the semi-spherical recess.
  • the invention relates to a spherical shoe including a convex semi-spherical surface which is fitted into a semispherical recess formed in a first movable member so as to be in sliding contact therewith, and an end face disposed for sliding contact with a flat surface on a second movable member.
  • the convex semi-spherical surface which is disposed in sliding contact with the semi-spherical recess formed in the first movable member is defined by a convex surface of a revolving body which is formed by rotating an arc of a circle having a center which is disposed at a given distance from an axis in a direction orthogonal thereto about the axis.
  • the top region of the convex semispherical surface of the semi-spherical shoe has an edge which is arcuate in section, maintaining a clearance between the edge of the top region and the opposing recess which is wedge-shaped in section.
  • a lubricant oil which is stored in a space formed between the top region of the convex semi-spherical surface of the semi-spherical shoe and the top of the semispherical recess in the first movable member, to be supplied onto the sliding portions of the convex semi-spherical surface and the semi-spherical recess through the wedge-shaped clearance in a facilitated manner.
  • This enables a semi-spherical shoe having a good sliding response and a long life to be provided.
  • the width of an area of abutment between the semispherical recess in the first movable member and the convex semi-spherical surface of the semi-spherical shoe can be reduced as compared with the prior art, allowing the lubricant oil to be effectively supplied to a central area of the sliding portions if the semi-spherical shoe undergoes a rocking motion of a reduced magnitude or when the angle of inclination of the second movable member is small.
  • FIG. 1 is a cross section of one embodiment of the present invention.
  • FIG. 2 is an enlarged view of part shown in FIG. 1.
  • a swash plate compressor comprises a semi-spherical shoe 1 , a piston 2 which is driven for reciprocating motion in the vertical direction as viewed in FIG. 1, and a flat swash plate 3 which is driven for rotation by a rotary shaft.
  • the piston 2 has an end face 2 A, in which a semi-spherical recess 2 B is formed.
  • the semi-spherical recess 2 B is formed with a common curvature, represented by a radius R 1 , over the entire area.
  • the semi-spherical shoe 1 includes a convex semi-spherical surface 1 A in the form of a semi-sphere, and a smoothened end face 1 B.
  • a top portion, as viewed in FIG. 1, of the convex semi-spherical surface 1 A is formed as a non-contact region 1 C which is prevented from contacting the semi-spherical recess 2 B.
  • the end face 1 B is formed centrally, or in a region around the axis thereof, with a substantially conical opening 1 D.
  • the convex semi-spherical surface 1 A of the semi-spherical shoe 1 is fitted into the semi-spherical recess 2 B in the piston 2 while the end face 1 B is disposed in abutment against the swash plate 3 .
  • a space 4 is formed between the non-contact region iC and the opposing semi-spherical recess 2 B in the piston 2 , and a space 5 is formed by the opening 1 D and the swash plate 3 .
  • These spaces 4 and 5 serve as temporary reservoirs of lubricant oil, containing a supply of lubricant oil therein.
  • a clearance 6 which is wedge-shaped in section is defined between a region of the semi-recess 2 B which is located adjacent to an edge 2 A′ (inlet) and the opposing convex semi-spherical surface 1 A. Accordingly, in the present embodiment, a region of the convex semi-spherical 1 A which is located nearer the non-contact region 1 C or the space 4 than the clearance 6 defines a sliding surface 1 F with respect to the semi-spherical recess 2 B (shown hatched in FIG. 1).
  • the piston 2 is driven through the semi-spherical shoe 1 for reciprocating motion. This takes place by a sliding movement between the end face 1 B of the semi-spherical shoe 1 and the swash plate 3 and a sliding motion of the sliding surface 1 F of the convex semi-spherical surface 1 A relative to the semi-spherical recess 2 B.
  • the lubricant oil is introduced into the clearance 6 from the side represented by the edge 2 ′ to be fed into the sliding portions of the sliding surface 1 F of the convex semi-spherical surface 1 A and the semi-spherical recess 2 B.
  • the lubricant oil which is stored in the top space 4 permeates into the sliding portions of the sliding surface 1 F of the convex semi-spherical surface 1 A and the semi-spherical recess 2 B, thus cooling the sliding portions.
  • the lubricant oil stored in the space 5 permeates into the sliding portions of the end face 1 B and the swash plate 3 , again cooling these portions.
  • an opening which is similar to the opening 1 D formed in the end face 1 D may be formed centrally in the non-contact region 1 C or in the top of the convex semi-spherical surface 1 A.
  • an arrangement to promote a supply of lubricant oil stored in the space 4 to the sliding surface 1 F of the convex semi-spherical surface 1 A is made by forming the convex semi-spherical surface 1 A of the semi-spherical shoe 1 in a manner to be described below.
  • the convex semispherical surface 1 A is defined by a convex surface of a revolving body which results when an arc of a circle having a radius R 2 and having a center C which is located at a given distance offset from an axis L of the semispherical shoe 1 in a direction orthogonal thereto is rotated about the axis L.
  • the no-contact region 1 C is formed by a top portion of the revolving body.
  • the no-contact region 1 C is shown to be gently arcuate in section, but the non-contact region 1 C may be delineated by a flat surface which extends orthogonal to the axis L.
  • the radius R 2 of the arc of a circle is chosen to be less than the radius R 1 of the semi-spherical recess 2 B. Specifically, a difference R 1 -R 2 is chosen to be greater than 150 ⁇ m. In addition, in the present embodiment, a distance by which the center C is offset from the axis in an orthogonal direction is chosen to be in a range from 20 to 500 ⁇ m.
  • FIG. 2 What results is shown to an enlarged scale in FIG. 2 where it will be noted that a lead-in 1 G which is arcuate in section is formed in a boundary region between the non-contact region 1 C and the sliding surface 1 F.
  • a clearance 7 which is wedge-shaped in section and which becomes narrower toward the sliding surface 1 F is maintained between the lead-in 1 G and the semi-spherical recess 2 B.
  • an arrangement is made such that a distance by which the sliding surface 1 F is spaced from the axis L is less than a distance by which the outer peripheral edge of the end face 1 B which is in sliding contact with the swash plate 3 is spaced from the axis L.
  • the sliding surface 1 F is disposed so that it is located nearer the axis L than the outer peripheral surface of the end face 1 B, thus facilitating a rocking motion of the semi-spherical shoe 1 .
  • An extent of sliding motion as the sliding surface 1 F slides with respect to the semi-spherical recess 2 B is chosen such that when referenced to the axis of the semi-spherical recess 2 B of the piston 2 and centered about the center O of the radius R 1 of the semi-spherical recess 2 B, the sliding surface 1 F slides within an extent of 60° from the axis of the semi-spherical recess 2 B of the piston 2 , more preferably, within an extent from 5° to 60° and most preferably in an extent from 20° to 40° from the axis of the semi-spherical recess 2 B.
  • the convex semi-spherical surface 1 A of the semi-spherical shoe 1 is formed in the manner mentioned above to define the lead-in 1 G toward the space 4 , the lubricant oil which is stored in the space 4 can be smoothly introduced onto the sliding surface 1 F through the clearance 7 , thus allowing the sliding surface 1 F to be cooled in a favorable manner. Accordingly, the semi-spherical shoe 1 of the present embodiment has a good cooling effect of the sliding surface 1 F by the lubricant oil and also has a good sliding response, both contributing to increasing the useful life thereof as compared with the prior art.
  • the width of an area of abutment between the convex semi-spherical surface 1 A of the semispherical shoe 1 and the semi-spherical recess 2 B of the piston 2 can be reduced as compared with the prior art, allowing the lubricant oil to be effectively supplied to the center area of the sliding portions of the sliding surface 1 F of the semi-spherical shoe 1 and the semi-spherical recess 2 B when the amplitude of rocking motion of the semi-spherical shoe 1 is small or when a angle of inclination of the swash plate 3 is small.
  • regions of the convex semi-spherical surface 1 A other than the non-contact region 1 C are constructed by a convex surface which is described in relation to the arc of the radius R 2 , but at least the region of the sliding surface 1 F may be constructed by a convex surface which is described in relation to the arc of the radius R 2 .
  • a semi-spherical shoe which has a good sliding response and an increased length of useful life.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Reciprocating Pumps (AREA)
US10/070,030 2000-03-03 2001-02-16 Hemispherical shoe Abandoned US20020134231A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000059662A JP2001248547A (ja) 2000-03-03 2000-03-03 半球状シュー
JP59662/2000 2000-03-03

Publications (1)

Publication Number Publication Date
US20020134231A1 true US20020134231A1 (en) 2002-09-26

Family

ID=18580082

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/070,030 Abandoned US20020134231A1 (en) 2000-03-03 2001-02-16 Hemispherical shoe

Country Status (8)

Country Link
US (1) US20020134231A1 (zh)
EP (1) EP1174618A4 (zh)
JP (1) JP2001248547A (zh)
KR (1) KR20020000880A (zh)
CN (1) CN1162617C (zh)
BR (1) BR0104746B1 (zh)
HU (1) HUP0201553A2 (zh)
WO (1) WO2001065116A1 (zh)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004092583A1 (ja) * 2003-04-17 2004-10-28 Zexel Valeo Climate Control Corporation 斜板式圧縮機
JP3904011B2 (ja) * 2004-09-03 2007-04-11 大豊工業株式会社 半球状シューの製造方法
KR100743467B1 (ko) * 2005-08-30 2007-08-01 정동준 자동 유리창 청소장치
DE102006008437A1 (de) * 2006-02-23 2007-10-04 Schaeffler Kg Gleitschuh für ein Taumelscheibengetriebe
DE102007012869A1 (de) * 2007-03-17 2008-09-18 Schaeffler Kg Taumelscheibengetriebe, insbesondere für einen Axialkolbenkompressor
JP5339043B2 (ja) * 2008-09-16 2013-11-13 大豊工業株式会社 シュー
CN102141028A (zh) * 2011-02-12 2011-08-03 上海光裕汽车空调压缩机有限公司 双向斜板式压缩机的滑履结构
EP3173622B1 (en) 2014-07-23 2021-11-17 NTN Corporation Semispherical shoe for swash plate compressor, and swash plate compressor
JP2023044742A (ja) * 2021-09-21 2023-04-03 大豊工業株式会社 圧縮機構

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001604A1 (en) * 1982-10-12 1984-04-26 Taiho Kogyo Co Ltd Swash plate compressor and method of manufacturing shoe therefor
JPH075259Y2 (ja) * 1986-07-01 1995-02-08 株式会社豊田自動織機製作所 斜板式圧縮機におけるピストンとシューの係合構造
JP3942242B2 (ja) * 1997-08-01 2007-07-11 Ｎｔｎ株式会社 斜板式コンプレッサ用シュー
US6024010A (en) * 1997-08-01 2000-02-15 Ntn Corporation Shoe for swash plate type compressor and shoe assembly
JPH1150960A (ja) * 1997-08-01 1999-02-23 Ntn Corp 斜板式コンプレッサ用シュー及びその組込み構造
JP3958420B2 (ja) * 1997-11-28 2007-08-15 サンデン株式会社 斜板式コンプレッサー用シュー及び斜板式コンプレッサー用ピストンジョイント
JP4149056B2 (ja) * 1998-12-10 2008-09-10 Ｎｔｎ株式会社 斜板式コンプレッサの軸受装置

Also Published As

Publication number Publication date
BR0104746A (pt) 2002-01-15
EP1174618A4 (en) 2003-01-02
WO2001065116A1 (fr) 2001-09-07
CN1162617C (zh) 2004-08-18
BR0104746B1 (pt) 2009-08-11
HUP0201553A2 (en) 2002-08-28
KR20020000880A (ko) 2002-01-05
EP1174618A1 (en) 2002-01-23
JP2001248547A (ja) 2001-09-14
CN1364222A (zh) 2002-08-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: TAIHO KOGYO CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NAKAYAMA, SEIICHI;TAKEHARA, YUKIHITO;MURAMATSU, SHOGO;AND OTHERS;REEL/FRAME:012713/0464

Effective date: 20011009

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION