WO1996031701A1 - Positive displacement hydraulic machines - Google Patents
Positive displacement hydraulic machines Download PDFInfo
- Publication number
- WO1996031701A1 WO1996031701A1 PCT/GB1996/000764 GB9600764W WO9631701A1 WO 1996031701 A1 WO1996031701 A1 WO 1996031701A1 GB 9600764 W GB9600764 W GB 9600764W WO 9631701 A1 WO9631701 A1 WO 9631701A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- casing
- spigot
- bores
- overlapping
- positive displacement
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/086—Carter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
Definitions
- This invention relates to positive displacement hydraulic machines of the kind comprising a gear pump or motor having a body in which there are formed overlapping bores within which two gears are disposed for rotation in mesh with each other.
- the body is adapted to accommodate the gears with minimal radial clearance at the tips of their teeth and minimal axial clearance at their end faces.
- the body comprises a casing•with two end covers in which there are mounted bearings for supporting two parallel shafts carrying respective gears, at least one of the covers being separate from the casing to enable the machine to be assembled and being secured to the casing as by set-screws.
- One end of one of the shafts projects from the body and constitutes the power input in the case of a pump and the power output in the case of a motor.
- the invention comprises a positive displacement hydraulic machine comprising a body in which there are formed overlapping bores adapted to receive two gears for rotation in mesh with each other and one or more end covers adapted to be located on the casing by means of an integral non- circular spigot which fits directly into the adjacent ends of the overlapping bores.
- the spigot has an end profile which comprises portions of two overlapping circles smoothly interconnected by arcs to form a waisted shape approximating to a figure of eight.
- the spigot may be a close clearance fit in the adjacent ends of the overlapping bores, preferably it is an interference fit therein.
- radius means are provided between the inner end face of the cover and the spigot formed thereon, and chamfer means for accommodating the radius means and facilitating press-fitting of the cover into the casing are provided at the adjacent ends of the overlapping bores.
- Figure 1 is an end elevation of the open end of a gear pump casing with one integral end cover
- Figure 2 is an enlargement of the area circled at 2 in Figure 1;
- Figure 3 is a section on the line 3-3 in Figure 1;
- Figure 4 is an end elevation of the inner face of a separate end cover for the casing.
- Figure 5 is a section on the line 5-5 in Figure 4.
- a gear pump body comprises a casing 10 with an integral end cover 12 and a separate end cover 14.
- overlapping parallel bores 16 formed in the casing 10 with their centre-lines in a plane 18 are intersected by parallel troughs 20 and 22 formed symmetrically about a plane 24 perpendicular to the plane 18, the trough 20 being deeper that the trough 22.
- An inlet port 26 having its centre-line in the plane 24 communicates with the trough 20, and an outlet port 28 likewise having its centre-line in that plane communicates with the trough 22.
- the casing 10 has a flat end face 30 in which there are formed four tapped holes 32 and an asymmetrical groove 34.
- Parallel blind bores 36 which are not quite co-axial with the overlapping bores 16 are formed in the casing 10 for the purpose of accommodating bearings for one end of the shafts carrying the gears which are disposed, in use, in the bores 16.
- Chamfer means 38 are provided at the open ends of the overlapping bores 16 and are discontinuous at respective points on the bores (one of which points is best seen in Figure 2), the discontinuities comprising circumferentially short (say 1 millimetre) integral projections 40 and 42.
- the separate end cover 14 has a non- circular spigot 50 formed on its inner end face 52, the end profile of the spigot comprising portions of two overlapping circles 54 smoothly interconnected by arcs 56 to forma waisted shape approximating to a figure of eight. These portions are a light interference fit of, say, 50 microns directly into the open ends of the overlapping bores 16 formed in the casing 10. Radius means 58 small enough to be accommodated within the space defined by the chamfer means 38 are provided between the inner end face 52 of the cover 14 and the spigot 50 formed thereon.
- the cover 14 has formed in it four clearance holes 60 adapted to be aligned with the four tapped holes 32 formed in the casing 10.
- Parallel bores 63 and 64 which are adapted to be accurately aligned with the parallel bores 36 are formed in the cover 14 for the purpose of accommodating bearings for the other end of the shafts carrying the gears which are disposed in the overlapping bores 16.
- the bore 62 is blind but the bore 64 passes completely through the cover 14 to enable one end of the associated shaft to project from the gear pump body so as to constitute the power input, the bore 64 being adapted to house oil seal means.
- the pump is assembled by mounting the bearings in the bores 36, 62 and 64 and the oil seal means in the bore 64, locating one end of the shafts in the bearings mounted in the bores 36, placing an O-ring in the groove 34, fitting the cover 14 over the other end of the shafts, and inserting four set-screws through the holes 60 into engagement with the holes 32.
- Tightening of the set-screws causes the spigot 50 to make a press fit into the adjacent ends of the overlapping bores 16, facilitated by the chamfer means 38, so that the bores 32, 62 and 64 are both accurately and firmly aligned; the O-ring in the groove 34 is compressed to seal the joint between the flat end face 30 of the casing 10 and the inner end face 52 of the cover 14; and the projections 40 and 42 are deformed so as to block the arcuate leakage paths from the outlet side to the inlet side of the pump which would otherwise exist between the chamfer means 38 and the radius means 58.
- the end profile of the spigot 50 needs not conform to the preferred shape described and illustrated herein but it must make close clearance fit, or, preferably, an interference fit with the open ends of the overlapping bores 16 in the casing 10.
- the projections 40 and 42 can be provided on the radius means 58 instead of on the chamfer means 38.
- the invention is equally well applicable to a hydraulic gear motor as to a gear pump.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Fluid-Pressure Circuits (AREA)
- Hydraulic Motors (AREA)
- Vehicle Body Suspensions (AREA)
- Reciprocating Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Lubricants (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69602435T DE69602435T2 (en) | 1995-04-01 | 1996-03-29 | HYDRAULIC DISPLACEMENT MACHINES |
EP96908244A EP0819218B1 (en) | 1995-04-01 | 1996-03-29 | Positive displacement hydraulic machines |
AU51564/96A AU5156496A (en) | 1995-04-01 | 1996-03-29 | Positive displacement hydraulic machines |
JP8530074A JPH11503213A (en) | 1995-04-01 | 1996-03-29 | Displacement hydraulic machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9506826.8 | 1995-04-01 | ||
GBGB9506826.8A GB9506826D0 (en) | 1995-04-01 | 1995-04-01 | An improvement in positive displacement hydraulic machines |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996031701A1 true WO1996031701A1 (en) | 1996-10-10 |
Family
ID=10772392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1996/000764 WO1996031701A1 (en) | 1995-04-01 | 1996-03-29 | Positive displacement hydraulic machines |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0819218B1 (en) |
JP (1) | JPH11503213A (en) |
KR (1) | KR19980703498A (en) |
CN (1) | CN1185197A (en) |
AT (1) | ATE180043T1 (en) |
AU (1) | AU5156496A (en) |
DE (1) | DE69602435T2 (en) |
GB (1) | GB9506826D0 (en) |
WO (1) | WO1996031701A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015503589A (en) * | 2012-01-05 | 2015-02-02 | メルツ ノース アメリカ, インコーポレイテッド | Skin whitening composition |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2460957A (en) * | 1944-12-20 | 1949-02-08 | Joseph E Whitfield | Housing joint |
US2923248A (en) * | 1954-01-27 | 1960-02-02 | New York Air Brake Co | Pump |
GB2067667A (en) * | 1980-01-23 | 1981-07-30 | Kayaba Industry Co Ltd | Rotary positive-displacement fluid-machines |
GB2077358A (en) * | 1980-05-30 | 1981-12-16 | Kayaba Industry Co Ltd | Rotary positive-displacement fluid-machines |
GB2247923A (en) * | 1990-09-15 | 1992-03-18 | Ultra Hydraulics Ltd | Rotary positive displacement hydraulic machines |
-
1995
- 1995-04-01 GB GBGB9506826.8A patent/GB9506826D0/en active Pending
-
1996
- 1996-03-29 EP EP96908244A patent/EP0819218B1/en not_active Expired - Lifetime
- 1996-03-29 WO PCT/GB1996/000764 patent/WO1996031701A1/en not_active Application Discontinuation
- 1996-03-29 CN CN96194082A patent/CN1185197A/en active Pending
- 1996-03-29 JP JP8530074A patent/JPH11503213A/en active Pending
- 1996-03-29 KR KR1019970706902A patent/KR19980703498A/en not_active Application Discontinuation
- 1996-03-29 AT AT96908244T patent/ATE180043T1/en not_active IP Right Cessation
- 1996-03-29 AU AU51564/96A patent/AU5156496A/en not_active Abandoned
- 1996-03-29 DE DE69602435T patent/DE69602435T2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2460957A (en) * | 1944-12-20 | 1949-02-08 | Joseph E Whitfield | Housing joint |
US2923248A (en) * | 1954-01-27 | 1960-02-02 | New York Air Brake Co | Pump |
GB2067667A (en) * | 1980-01-23 | 1981-07-30 | Kayaba Industry Co Ltd | Rotary positive-displacement fluid-machines |
GB2077358A (en) * | 1980-05-30 | 1981-12-16 | Kayaba Industry Co Ltd | Rotary positive-displacement fluid-machines |
GB2247923A (en) * | 1990-09-15 | 1992-03-18 | Ultra Hydraulics Ltd | Rotary positive displacement hydraulic machines |
Also Published As
Publication number | Publication date |
---|---|
GB9506826D0 (en) | 1995-05-24 |
ATE180043T1 (en) | 1999-05-15 |
KR19980703498A (en) | 1998-11-05 |
AU5156496A (en) | 1996-10-23 |
CN1185197A (en) | 1998-06-17 |
DE69602435D1 (en) | 1999-06-17 |
EP0819218A1 (en) | 1998-01-21 |
EP0819218B1 (en) | 1999-05-12 |
DE69602435T2 (en) | 1999-11-25 |
JPH11503213A (en) | 1999-03-23 |
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