EP2049796A1 - Vorrichtung zum ankoppeln eines kolbens an eine ringscheibe - Google Patents
Vorrichtung zum ankoppeln eines kolbens an eine ringscheibeInfo
- Publication number
- EP2049796A1 EP2049796A1 EP07722534A EP07722534A EP2049796A1 EP 2049796 A1 EP2049796 A1 EP 2049796A1 EP 07722534 A EP07722534 A EP 07722534A EP 07722534 A EP07722534 A EP 07722534A EP 2049796 A1 EP2049796 A1 EP 2049796A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sliding
- piston
- annular disc
- sliding surface
- shoe
- 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.)
- Granted
Links
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
- F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
- F04B27/0878—Pistons
- F04B27/0886—Piston shoes
-
- 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
- F04B1/124—Pistons
- F04B1/126—Piston shoe retaining means
Definitions
- the invention relates to a device for coupling a piston to an annular disc, in particular to a swivel / swash plate or to a swivel ring of the working unit of a reciprocating engine, preferably a compressor of the air conditioning system of a motor vehicle, with a piston associated with the piston bridge and between the annular disc and the piston bridge acting sliding blocks, wherein the piston bridge at least partially encompasses or overlaps the annular disc and is in sliding engagement with the annular disc via the sliding shoes.
- Such a reciprocating engine can be, for example, a compressor, for example a compressor for the air conditioning system of a motor vehicle.
- Such compressors are also commonly referred to as air conditioning compressors and include a housing which includes an externally driven compressor unit.
- the compressor unit designed, for example, as an axial piston machine, in turn, comprises a plurality of pistons, which can be moved back and forth in a cylinder block. Upon rotation of a swash plate usually formed as an annular disc or when pivoting a corresponding swash plate, the pistons are moved back and forth.
- the housing is usually closed.
- Schwenkinnkompressoren or swing ring compressors are well known in a variety of designs. For example only, reference is made to DE 4 441 721 A1 and to DE 100 10 142 C 2.
- a circular, ring-like swash plate also called swivel ring
- the swashplate is driven for rotation by the machine shaft. This is done via a slide body guided axially on the machine shaft and via a driving pin arranged at a distance from the machine shaft.
- the pistons have joint arrangements with which the swash plate is in sliding engagement.
- the known reciprocating engine comprises a working unit with a plurality of correspondingly driven pistons, wherein the pistons are guided in cylinder bores and follow through special coupling elements of the pivoting / tumbling motion of the annular disc and thus perform their stroke.
- the generic device used in the known reciprocating engine usually includes sliding blocks, which are problematic especially in the use of C0 2 compressors, due to the high pressures and pressure differences occurring there. So most sliding shoes tend to seize on the ring disc or on its sliding surface. In addition, the shoe is insufficiently supplied with lubricant, so that increased wear takes place. In addition, a lack of lubricant leads to increased operating noise.
- the present invention is therefore based on the object, a device for coupling a piston to an annular disc, in particular to a swivel / swash plate or to a swivel ring of a working unit of a reciprocating engine, preferably a compressor of the air conditioning of a motor vehicle, namely a device of the gattunsbil- denden Art to design and further develop that the problems of lubrication occurring in the prior art are largely eliminated. Furthermore, a shoe for a corresponding device should be specified. Finally, a reciprocating engine to be specified with a corresponding device in which the aforementioned problems are also eliminated.
- the generic device is characterized in that the sliding blocks on the side facing the annular disc around its actual sliding surface, towards the annular disc out, form an outer, the sliding surface circumferential gap, which serves for receiving or storing lubricant.
- an outer gap is provided which surrounds or revolves the sliding surface.
- This gap is made sufficiently flat relative to the surface of the annular disk, so that due to the resulting capillary effect, a lubricant reservoir is formed, in which the lubricant can collect due to capillary forces.
- sliding surface does not necessarily mean a self-contained surface which comes to rest on the surface of the annular disc. Rather, the sliding surface is defined by regions of the sliding shoe, wherein intermediate spaces can be filled with lubricant ,
- the shoe is at least slightly resilient. Due to the resilient property of the sliding block, it can be stronger under load or pressed against the surface of the annular disc, thereby increasing the contact area. When springing back lubricant may first flow into the circumferential gap, wherein the volume formed in the gap increases at least slightly.
- the sliding block may be made of metal, preferably of steel and / or of aluminum. It is also conceivable that the sliding shoe is surface-coated, preferably by means of plastic.
- the shoe is made of plastic, possibly with additives or inclusions in the sense of a composite material, in an ideal manner by means of injection molding.
- a sliding shoe made of plastic has the great advantage that - per se - it has a lower mass than a sliding block made of metal, in particular of steel.
- a plastic shoe already considered by itself reduces the noise generated during operation due to the low mass.
- the injection molding production of a sliding shoe made of plastic has the further advantage that no machining is required for its production.
- the shoe can be manufactured by injection molding to final dimensions. It is possible to increase the margin of tolerance for the game between shoe, swivel ring and piston, namely by using a termoplastischen material.
- the sliding surface of the circumferential gap is designed as an annular gap.
- a rotationally symmetrical design would be created on the one hand of the annular gap and on the other hand, the sliding surface.
- the gap surrounding the sliding surface-annular gap- can be formed by a shoulder protruding from the sliding shoe or from the sliding surface or by a corresponding elevation, wherein this shoulder or the elevation can likewise be annular.
- the annular gap is predetermined on the one hand by the outer contour of the shoe and on the other hand by the paragraph.
- the sliding surface has an at least slightly inwardly directed recess, a recess or the like, wherein the sliding surface may be concave thereto.
- an inwardly directed curvature which forms an inner depot for lubricants.
- the concavity that is, the inward chamfer, can range from 0.01 mm to 0.05 mm. This ensures that sufficient lubricant is collected or stored in the region of the annular gap using the outer capillary effect.
- an inner capillary effect acts with a concavity in the range of preferably 0.01 mm to 0.05 mm, so that springs back in the suction phase of the shoe and increases the inner volume in the sliding surface. Lubricant is sucked in from the outer annular gap and passes directly into the area of the sliding surface.
- lubrication grooves are formed in the sliding surface, which extend inwards from the outer annular gap and are at least partially open in the sliding surface.
- the provision of the lubrication grooves also avoids seizing the sliding surface on the surface of the sliding ring.
- a sufficient amount of lubricant is transported through the lubrication grooves in the inner region of the sliding surface.
- the lubrication grooves can be partially open or closed.
- An overall open design of the lubrication grooves is particularly advantageous with regard to a simple construction / production, so that the lubrication grooves open overall in the sliding surface or are designed to be open from the outset.
- the lubrication grooves may extend radially inwardly from the annular gap, it being conceivable that they end at a distance from the center, so that they do not influence one another. It is also conceivable that the lubrication grooves have an H-shaped arrangement in the sliding surface. Any other embodiments are possible, it being ensured that sufficient lubricant passes through the Schmiemuten in the region of the sliding surface of the shoe.
- the lubrication grooves may have an approximately rectangular cross section with a substantially flat groove bottom. It is also conceivable that the lubrication grooves about V-shaped cross-section have tapered groove bottom. A part-circle or part-type core-like cross section with a curved or arcuate groove bottom is also conceivable.
- a continuous bore is formed in the sliding shoe, which produces a flow connection between the sliding surface and the piston bridge or the pan facing surface of the sliding shoe.
- Such a continuous bore if possible arranged centrally, effectively avoids a fixed eye of the shoe on the surface of the annular disc, in particular during spring back of the shoe.
- the through hole communicates with both sides of the shoe, which also in this respect a transport of lubricant is possible.
- the sliding shoe On the side facing the piston bridge, the sliding shoe is equipped in a further advantageous manner with a spherical segment surface for engagement in a pan associated with the piston bridge with correspondingly adapted geometry.
- lubricant is used, and it is of far-reaching advantage if the radius of the spherical segment surface deviates at least slightly from the radius of the inner wall of the cup.
- the radius of the spherical segment surface may be at least slightly smaller or slightly larger than the radius of the pan, resulting in different systems and power relationships between the shoe and the piston bridge or the pan. A firm eye between the two components is effectively avoided due to the different radii.
- a shoe according to the above statements is claimed, which is for use in a device for coupling a piston to an annular disc, in particular to a swivel / swash plate or to a swivel ring of the working unit of a reciprocating engine, is used.
- a reciprocating engine comprising a device according to the invention and thus also a sliding shoe according to the invention.
- a reciprocating engine comprising a device according to the invention and thus also a sliding shoe according to the invention.
- FIG. 2 shows a schematic side view, cut away, of a second embodiment of a device according to the invention
- Fig. 3 is a schematic view, from below, an embodiment of a shoe and
- Fig. 4 in a schematic view, from below, another embodiment of a shoe.
- annular disc 1 and 2 show two different embodiments of a device for coupling a piston, not shown in the figures, to an annular disc 1, which is merely indicated in FIGS. 1 and 2.
- the annular disc 1 is a swivel / swash plate or a swivel ring of the working unit of a reciprocating piston engine, as is known, for example, from DE 197 49 727 C2. With regard to details relating to this, reference is expressly made to DE 19749 727 C2.
- the device comprises a piston bridge 2 assigned to the piston, and sliding shoes 3 acting between the annular disc 1 and the piston bridges 2, wherein for the sake of simplicity only a part of the piston bridge 2 and a single sliding block 3 are shown. It should be noted in addition that the piston bridge 2, the annular disc 1 partially engages over and that the piston is not shown on the sliding blocks 3 in sliding engagement with the annular disc 1.
- the sliding blocks 3 on the side facing the annular discs 1, to the actual sliding surface 4 around, to the annular disc 1 out, an outer, the sliding surface 4 circumferential gap 5, which serves for receiving or storing lubricant.
- the shoe 3 is made of plastic in the embodiments chosen here and has resilient properties. Specifically, the shoe 4 is produced by injection molding.
- FIGS. 3 and 4 show this particularly clearly.
- the sliding surface circumferential gap 5 has a projecting from the shoe 3 and the sliding surface 4 paragraph 6, wherein the paragraph 6 also has annular configuration.
- the annular gap 5 is defined or limited by the outer contour of the sliding block 3 and by the annular shoulder 6.
- the sliding surface 4 has a concave configuration, that is, an inwardly directed curvature.
- This curvature also serves as a lubricant reservoir, wherein the inner space 7 thus formed during the unloading of the shoe 3, that is, the spring back of the shoe 3, fully sucks with lubricant, which is sucked from the region of the annular gap 5 in the inner space 7.
- the concavity is for example in the range between 0.01 mm to 0.05 mm.
- the sliding surface 4 is convex, thus enclosing an outward curvature. Regardless, the sliding surface 4 is surrounded even in the embodiment shown in FIG. 2 by an annular gap 5 from which lubricant can flow into the area below the sliding surface 4 or laterally of the sliding surface 4, namely in particular when the sliding block 3 relieves is and the gap increases laterally or under the sliding surface 4 during the return spring of the shoe 3.
- FIGS. 3 and 4 show exemplary embodiments of a sliding shoe 3, namely in a view from below, that is to say seen from the annular disk 1.
- lubrication grooves 8 extend into the region of the sliding surface 4, so that a sufficiently good supply of lubricant is ensured.
- the lubricating grooves 8 ensure that a firm eye of the shoe 3 is effectively avoided.
- the lubrication grooves 8 extend radially toward the center, the lubrication grooves 8 shown in Fig. 4 are arranged in an H-shape. Any other arrangements are conceivable, with always a flow connection to the annular gap 5 is provided.
- the lubrication grooves 8 may have a different cross section, for example rectangular cross sections, rounded walls, V-shaped cross sections, etc.
- the sliding block 3 comprises, on the side facing the piston bridge 2, a spherical segment surface 9 for engagement in a cup 10 assigned to the piston bridge 2 with a correspondingly adapted geometry.
- the radius of the spherical segment surface 9 is slightly smaller than the radius of the pan 10, so that a small gap 11 is in the unloaded state.
- the spherical segment surface 9 has a slightly larger radius than the pan 10, so that a clearance between the piston bridge 2 and the shoe 3 is made, also in the unloaded state.
- a spring back of the shoe 3 in relief of the shoe 3 avoids a mutual suction of the components, so that even in so far the sliding property is favored quite considerably.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Braking Arrangements (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006035148 | 2006-07-29 | ||
PCT/DE2007/001077 WO2008014736A1 (de) | 2006-07-29 | 2007-06-19 | Vorrichtung zum ankoppeln eines kolbens an eine ringscheibe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2049796A1 true EP2049796A1 (de) | 2009-04-22 |
EP2049796B1 EP2049796B1 (de) | 2010-03-10 |
Family
ID=38564486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07722534A Not-in-force EP2049796B1 (de) | 2006-07-29 | 2007-06-19 | Vorrichtung zum ankoppeln eines kolbens an eine ringscheibe |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2049796B1 (de) |
AT (1) | ATE460586T1 (de) |
DE (2) | DE502007003098D1 (de) |
WO (1) | WO2008014736A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6077767B2 (ja) * | 2012-06-27 | 2017-02-08 | 株式会社ヴァレオジャパン | 斜板式圧縮機用摺動部材の表面形状測定方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4568252A (en) * | 1980-03-07 | 1986-02-04 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Swash-plate type compressor |
JPS6026188A (ja) * | 1983-07-20 | 1985-02-09 | Taiho Kogyo Co Ltd | 斜板式コンプレツサ |
JPS61167178A (ja) * | 1985-01-18 | 1986-07-28 | Taiho Kogyo Co Ltd | 斜板式コンプレツサ用シユ |
JP3627358B2 (ja) * | 1996-03-26 | 2005-03-09 | 株式会社豊田自動織機 | 片側斜板式圧縮機 |
JP3298571B2 (ja) * | 1999-11-26 | 2002-07-02 | 大豊工業株式会社 | 摺動装置 |
JP2002332959A (ja) * | 2001-05-10 | 2002-11-22 | Toyota Industries Corp | 球冠状シューおよびそれが配設された斜板式圧縮機 |
JP2002332960A (ja) * | 2001-05-10 | 2002-11-22 | Toyota Industries Corp | シューの製造方法 |
-
2007
- 2007-06-19 DE DE502007003098T patent/DE502007003098D1/de active Active
- 2007-06-19 WO PCT/DE2007/001077 patent/WO2008014736A1/de active Application Filing
- 2007-06-19 DE DE112007001657T patent/DE112007001657A5/de not_active Withdrawn
- 2007-06-19 AT AT07722534T patent/ATE460586T1/de active
- 2007-06-19 EP EP07722534A patent/EP2049796B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2008014736A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008014736A1 (de) | 2008-02-07 |
EP2049796B1 (de) | 2010-03-10 |
DE112007001657A5 (de) | 2009-04-16 |
ATE460586T1 (de) | 2010-03-15 |
DE502007003098D1 (de) | 2010-04-22 |
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