Taiho Kogyo Co., Ltd.

Hiroshi Kanemitsu

Masaharu Hatta

Masanori Akizuki

Tatsuhiko Fukuoka

Souzi Kamiya

Satoshi Nomura

Akira Takenaka

Hiroshi Kanayama

Keiichi Shimasaki

Makoto Shibata

Satoshi Asahi

Masaru Yoshikawa

Shingo Gotou

Takao Masamura

Naoki Horibe

Hideki Niimi

A compressor swash plate includes a base member having a flat plate shape, and a coating layer formed on a surface of the base member and having projections formed in a linear shape, in which the following inequalities are satisfied when a plane part formed on a prism is pressed against the coating layer with a pressure of 30 MPa: 0.01&#x2264;B&#x2264;0.06 and 10&#x2264;S&#x2264;40, where B indicates widths (mm) of surfaces of the projections in contact with the plane part, and S indicates a percentage (%) of a total sum of an area Si of the contact surfaces (a gross area of the surfaces of the projections in contact with the plane part) relative to a reference area (an area of a part of the coating layer against which the plane part is pressed).

Compressor swash plate and compressor equipped with same

First closing plate and second closing plate close opening portions at both ends of cylindrical member in an axial direction. Base is housed in a space formed by cylindrical member, first closing plate, and second closing plate, and rotates around an axis in the same direction as the axial direction of cylindrical member. Resin layers are formed on thrust surfaces of base. Groove C is a plurality of concentric circular grooves or a spiral groove formed on each resin layer, and the center of circles of the circular grooves or the center of a spiral of the spiral groove is different from the rotation center of base.

Rotor with a resin layer that has circular or spiral grooves

A scroll member includes a base having a panel and a spiral blade provided to extend from the panel toward another scroll member, resin layer Lformed on the base, and a plurality of grooves C formed on a surface of the resin layer. The plurality of grooves C are formed on the surface of resin layer L. A cross-section of each groove C has a shape similar to a U-shape or a semicircle in which the width decreases toward the deeper position and the rate of change in width increases toward the bottom. Grooves C are formed by moving an edge of a cutting tool along the original surface of the resin layer, which is originally formed on base Lby application or the like.

Scroll member and scroll-type fluid machine

A swash plateincludes a substratemade of an iron-based material, a hard first resin layerprovided to coat an end surface of the substrate, and a soft second resin layerprovided to coat the first resin layer. A spiral annular grooveA is formed in a surface of the first resin layer, and the second resin layeris provided to match the sectional shape of the first resin layer. With the soft second resin layeron a sliding surfaceA of the swash plate, a swash platehaving a good fit in an initial stage of sliding can be provided. When the second resin layerpartially wears, a protrusionof the first resin layerof the hard resin is exposed to provide good wear resistance and good sliding properties.

Swash plate and production method of the same

A thrust bearing is equipped with a resin coating applied to the surface of a base material. Lattice-shaped discharge grooves are formed in the surface of the thrust bearing, and planer protrusions having a square shape or the like are formed at the adjacent positions thereof. Each corner part of each planer protrusion form a sliding surface that slides with respect to a counterpart member. Contaminants such as wear particles that have infiltrated between the counterpart member and the sliding surface fail into the discharge grooves and then are discharged outside of the sliding surface. The chamfering of each corner part to a rounded shape prevents the contaminants from accumulating in the discharge grooves, thus preventing the contaminants from biting into the planer protrusions.

Sliding member and manufacturing method therefor

A swash plate of a swash plate-type compressor is covered with a resin-based coating layer containing 5 to 60 mass % of spherical graphite particles having an average particle diameter of 5 to 50 &#x3bc;m, the balance being one or more species selected from polyimide resin and polyamide-imide resin. The spherical graphite particles excepting minute particles having a particle diameter 0.5 times or smaller the average particle diameter, have an average shape coefficient (Y) falling within a range of 1 to 4, and 70% or more in number of the spherical graphite particles have a shape coefficient (Y) within a range of 1 to 1.5,=total[{/4&#x3c0;/4&#x3c0;wherein 'total' indicates that a value in [ ] is totalized for number 'i', &#x201c;PM&#x201d; indicates the circumferential length of one particle, &#x201c;A&#x201d; indicates a cross sectional area of one particle, and &#x201c;i&#x201d; indicates the measurement number.

Swash plate of swash-plate type compressor

A hemispherical shoeis equipped with a sliding surfaceA which slides with a swash plate, and a hemispherical convexB. Hardening is performed by radiating a laser so that minute circlesmay be drawn on the sliding surfaceA. Then, lapping is given to the sliding surfaceA and, finally, buffing is given thereto. Thereby, the annular swelling portions' and concavities&#x2032; are formed in positions of the circlesand, further, lubricating oil passages&#x2032; which include net-like concavities are formed in the sliding surfaceA. A hardening part is formed of the above-mentioned annular swelling portions&#x2032;. The above-mentioned annular swelling portions&#x2032; are formed so that a ratio of an area of a total of all the above-described annular swelling portions&#x2032; occupying an area of the sliding surfaceA which is a hardening object domain may become 0.3 to 0.8. It is possible to provide a shoewhich is good in seizure resistance in comparison with the past.

Shoe

A hemispherical shoe (sliding member)has a flat sliding surface, which is quenched to form a quenched portion. A part of the quenched sliding surface is partially annealed to form an annealed portion. When an oil film pressure acts on the sliding surface, the annealed portionis deformed by pressure so that the surface thereof has a concave portionA. In the annealed portion, a remaining quenched portionmay remain at the center part thereof. The concave portionA can be used as an oil reservoir or an oil flow path, so that an excellent seizure resistance can be ensured.

Sliding member and manufacturing method thereof

A swash plate type compressor includes a swash plate rotating around a rotating shaft, pistons that advance and retreat with the rotation of the swash plate and formed with a hemispherical concave sliding surface, and shoes formed with a flat end surface part in sliding contact with the swash plate and a spherical surface part in sliding contact with the sliding surface of the piston. A cylindrical part is formed between the spherical surface part and the end surface part of the shoe, and the shoe is formed with a flange part that surrounds the boundary portion between the cylindrical part and the end surface part and is in sliding contact with the swash plate. Further, the flange part is located on the inside of an imaginary spherical surface including the sliding surface of the piston.

Swash plate type compressor

A sliding deviceincludes a swash platerotated in association with a rotating shaftand semispherical shoessliding on the swash plate The semispherical shoesare formed of a ferrous material and the swash plateis manufactured using high-strength brass as a material. On a sliding surfaceA of the shoe, a large number of minute annular expandingly projecting parts' are formed by laser hardening and a lubricating oil passage&#x2032; consisting of a reticular concave part is also formed. Thereby, a sliding devicehaving excellent seizure resistance as compared with conventional sliding devices can be provided.

Sliding device

A sliding deviceis constituted of a swash plateincluding a first sliding surfaceA and a semispherical shoesliding with the swash plate. The swash plateis constituted of a base materialB of high strength brass containing Mn and Si, and very small granular Mn&#x2014;Si compoundsare exposed on an inside of the base materialB and on the first sliding surfaceA (surface of the base materialB). The above described swash plateincreases in exposure amount of the Mn&#x2014;Si compoundsexposed on the first sliding surfaceA by applying etching to the base materialB after cutting the base materialB. The sliding deviceis favorable in seizure resistance and has a low manufacturing cost as compared with conventional sliding devices.

A sliding member includes convex portions are formed by directly quenching a sliding surface of a sliding member in a line shape or a dot shape, and concave portions are formed in indirectly quenched portions adjacent to the directly quenched portions. An irregular surface is formed on the sliding surface by the directly quenched portions and the indirectly quenched portions. The directly quenched portions are formed in a lattice shape, a parallel straight line shape, a concentric circle shape or a spiral shape. With the irregular surface on the sliding surface by the directly quenched portions and the indirectly quenched portions, the seizure resistance can be improved.

Sliding member

A sliding surfaceA of a shoeundergoes laser radiation in a shape of a large number of parallel lines to form a large number of swollen portionsand concave portionsin adjacent positions thereof. The swollen portionsand the inner side thereof become direct-hardened portionswith a high hardness and the concave portionsand the inner side thereof become double-hardened portions, which are lower in hardness than the swollen portions After the laser hardening, the sliding surfaceA undergoes lapping up to a position of an imaginary lineto delete the relief and form a flat and smooth plane. Thereafter the sliding surfaceA undergoes buffing so that portions with a low hardness are chipped off more than portions with a high hardness to form a large number of minute irregularities on the sliding surfaceA.

Method for making a slide member

There is provided a semispherical shoe which is formed into a substantially semispherical shape by a convex semispherical surfaceand a flat end surface, the semispherical surface having a slidably contacting surfacethat is in slidable contact with a semispherical concave portion and non slidably contacting surfacesandthat are not in slidable contact with the concave portion. When the semispherical shoe is manufactured, first, after a semispherical material having a semispherical surface following the concave portion has been formed, the surface of the portion that is to be the slidably contacting surface on the semispherical surface is quenched to expand the quenched portion from the original surface of the semispherical surface, whereby the sliding surface is formed on the surface of the expanded portion, and the other portions are made the non slidably contacting portions.

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Toyota, Japan

Hiroshi Kanemitsu