EP3458224A1 - Method for manufacturing a piston rod unit and a hollow shaft - Google Patents
Method for manufacturing a piston rod unit and a hollow shaftInfo
- Publication number
- EP3458224A1 EP3458224A1 EP17736564.0A EP17736564A EP3458224A1 EP 3458224 A1 EP3458224 A1 EP 3458224A1 EP 17736564 A EP17736564 A EP 17736564A EP 3458224 A1 EP3458224 A1 EP 3458224A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston rod
- rod
- piston
- bore
- rod unit
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J7/00—Piston-rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/04—Connecting rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
Definitions
- the invention relates to a method for producing a piston rod unit in lightweight construction and a shaft which has been produced by such a method.
- Piston-cylinder units in particular hydraulic cylinders, are often used in large machines.
- a constant goal of the developers is to optimize the machines in terms of their total weight, not only to save production costs, but also to optimize the work efficiency of the machines.
- the piston rod units installed in hydraulic cylinders contribute only a comparatively small proportion to the overall weight, considerable weight savings can be achieved here, even with large types of machines, such as, for example, mining equipment.
- the aim of the present invention is therefore to show an improved manufacturing method for a piston rod unit, which allows an optimal lightweight construction, especially for mining equipment.
- the piston rod unit for the production of the piston rod unit, first a hollow piston rod by means of deep hole drilling in the rod shank hollow to drill to provide the desired weight savings.
- the resulting rod hole of the deep hole at the end of the rod is then closed by means of a forging process.
- the resulting closed piston rod is also suitable for use with heavy mining equipment, since the rod opening closed by the forging process can be conventionally connected to the piston of conventional piston rod units.
- the resulting piston rod can be connected to the piston via a simple screw connection.
- a suitable forging process proves the open-die forging.
- piston rod together with the piston rod head, is first mechanically machined out of a blank.
- piston rod and piston rod head are to be regarded as a one-piece component, any connections between the two sections of the piston rod accounts.
- the procedure is preferably such that a material supernatant is left on the rod end of the piston rod.
- a material overhang is left in the radial direction at the piston end of the tubular piston rod.
- This material supernatant is ideally used with appropriate thermo-mechanical stress during the forging process to add the resulting through the deep hole drilling bore openings. The material supernatant is thus brought to flow in the radial direction of the cylinder due to the thermo-mechanical stress. This makes it possible to close the drill hole at the end of the rod, without having to resort to other, negative impact on the dynamic load resistance of the cylinder bonding techniques.
- a mandrel is inserted into the deep hole bore before the beginning of the forging process, in particular in the region of the bore opening at the end of the rod.
- the inserted mandrel can be designed like a cylinder with a pointed end. Conceivable, however, are other geometric shapes.
- the mandrel may have a smooth surface structure.
- the mandrel surface may also provide a non-smooth structure, for example with a wave-like or other non-smooth profile.
- the bore end i. configured in the piston rod end bore completion radially.
- An otherwise edged bore cross section at the bore end could lead to a possible notch effect.
- composition of the produced piston rod with a piston is based for example exclusively on a screw connection.
- the present invention also relates to a piston rod unit which has been produced by such a method.
- the piston rod unit consequently has the same advantages and properties as have been explained in more detail above with reference to the method according to the invention. A repetitive description is omitted for this reason.
- the invention relates to the inventive use of the piston rod unit according to the present invention for a mining device, in particular for a mining excavator, ideally as a bucket cylinder.
- the present invention relates to a mining device, in particular a mining excavator with at least one piston rod unit, which is characterized in that the installed piston rod of the piston rod unit is made hollow.
- the piston rod unit was produced according to the method according to the invention.
- the mining device is characterized by the same advantages and properties, as they have already been explained by the method according to the invention.
- FIG. 1 shows a hydraulic cylinder according to the invention with the novel piston rod
- Figure 2 a picture of an intermediate in the inventive
- FIG 3 the piston rod according to Figure 2 after the forging process
- FIG. 4 shows the piston rod according to FIG. 2 after the forging process according to an alternative embodiment.
- FIG. 1 shows a completely assembled hydraulic cylinder in the form of a differential cylinder, which was produced according to the method according to the invention.
- the hydraulic cylinder comprises the cylinder housing 10 with the piston rod 20 displaceably mounted therein together with the piston 25.
- the piston 25 is screwed by way of a screw connection 26 to the piston rod end located in the cylinder 10. Part of the screw is the inside of the piston 25 internal thread of the piston nut
- an eye for mounting the piston rod unit is provided. The same applies to the closed cylinder end.
- the piston rod 20 comprises a deep hole 21 which extends in the longitudinal direction from the piston rod head 22 to the assembled piston 25.
- the manufacturing process of the piston rod unit initially provides, in a first step, to mechanically work out the piston rod 20 together with the piston rod head 22 from a blank.
- Piston rod 20 and piston rod head 22 are thus made from one and the same starting component and are to be regarded as a one-piece end product. Furthermore, a radial overhang of material 30 is left on the rod end of the piston rod 20 during the machining process.
- the deep hole 21 is made from the rod end in the direction of the rod head 22 with the bore length B.
- the inner end 23 of the deep hole 21 is carried out radially, so as to avoid a possible notch effect by an angular drill cross section.
- the resulting intermediate product is shown in FIG.
- the piston rod has a length L.
- the protruding material 30 is used after the deep hole bore 21 to close the drill hole on the rod shank. This is done by open-die forging or another suitable forging process. During the forging process, the protruding material 30 is then made to flow in the radial direction of the cylinder, starting from the thermomechanical load. This makes it possible to close the drill hole on the rod shaft, without having to fall back on otherwise, but negatively impacting the dynamic load resistance bonding techniques.
- a kind of mandrel 40 can be inserted into the bore 21 (see FIG. 3) in order to be able to precisely close and seal the bore opening and, on the other hand, to better control the material flow during forging.
- the proposed method further allows both can be acted more freely in the choice of material as well as in the Bohrdimensionen. This means, in particular, that due to the avoided weak points that can arise from previous bonding techniques, the yield in terms of weight reduction can be increased. With large cylinders for the mining area, this can in some cases save up to 400 kg.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016007593.7A DE102016007593A1 (en) | 2016-06-21 | 2016-06-21 | Method for producing a piston rod unit and piston rod unit |
PCT/EP2017/000723 WO2017220202A1 (en) | 2016-06-21 | 2017-06-21 | Method for manufacturing a piston rod unit and a hollow shaft |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3458224A1 true EP3458224A1 (en) | 2019-03-27 |
Family
ID=59295151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17736564.0A Pending EP3458224A1 (en) | 2016-06-21 | 2017-06-21 | Method for manufacturing a piston rod unit and a hollow shaft |
Country Status (5)
Country | Link |
---|---|
US (2) | US11193511B2 (en) |
EP (1) | EP3458224A1 (en) |
AU (1) | AU2017280498B2 (en) |
DE (1) | DE102016007593A1 (en) |
WO (1) | WO2017220202A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112498627A (en) * | 2020-11-24 | 2021-03-16 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Dock folding device |
CN112443533A (en) * | 2020-12-10 | 2021-03-05 | 徐州徐工液压件有限公司 | Integrally forged hollow piston rod with earrings |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1383002A (en) | 1920-06-30 | 1921-06-28 | Edwin J Mcilvried | Piston-rod and process of making said rod |
US2730331A (en) * | 1953-01-19 | 1956-01-10 | Peter J Harinck | Rotary mining machine |
US2981232A (en) * | 1957-04-10 | 1961-04-25 | Renault | Differential pressure pneumatic jacks adapted for automatic return to initial position |
US3463055A (en) * | 1966-12-02 | 1969-08-26 | Ltv Electrosystems Inc | Fluid actuator |
US4058178A (en) * | 1971-09-13 | 1977-11-15 | Tadano Ironworks Co., Ltd. | Hydraulic cylinder unit |
DE2457938C2 (en) * | 1974-12-07 | 1982-10-28 | Stabilus Gmbh, 5400 Koblenz | Safety gas spring |
DE8028763U1 (en) | 1980-10-29 | 1982-01-21 | Fichtel & Sachs Ag, 8720 Schweinfurt | Piston rod for vibration damper |
DE8210371U1 (en) | 1982-04-10 | 1982-06-24 | Reiche & Co, 4937 Lage | PISTON ROD WITH A RING-SHAPED SECTION FOR HYDROPENEUMATIC SHOCK ABSORBERS, EXHIBITORS, AND THE LIKE |
DE8308769U1 (en) | 1983-03-24 | 1983-09-08 | Fichtel & Sachs Ag, 8720 Schweinfurt | Piston rod for vibration damper |
US5349894A (en) * | 1993-10-01 | 1994-09-27 | Loud Engineering & Manufacturing | Locking hydraulic actuator |
DE19653393C2 (en) * | 1996-12-20 | 2000-09-28 | Mannesmann Sachs Ag | Vibration dampers, in particular for motor vehicles |
US5947001A (en) * | 1997-04-24 | 1999-09-07 | Turn-Act, Inc. | Molded piston |
DE10064365B4 (en) * | 2000-12-22 | 2010-12-16 | Schwing Gmbh | Hydraulic Cylinder |
CA2507149A1 (en) * | 2005-05-12 | 2006-11-12 | P & M Design & Consulting Ltd. | Pneumatic cylinder |
WO2008010265A1 (en) * | 2006-07-19 | 2008-01-24 | Nippon Light Metal Company, Ltd. | Friction welded part and method of friction welding |
DE102008034582A1 (en) | 2008-07-24 | 2010-01-28 | Liebherr-Hydraulikbagger Gmbh | implement |
WO2010141628A2 (en) * | 2009-06-02 | 2010-12-09 | Dunn Marcus L | Helicopter landing gear damper |
DE102010051665A1 (en) * | 2010-11-17 | 2012-05-24 | Liebherr-Hydraulikbagger Gmbh | implement |
DE102012106423A1 (en) * | 2012-07-17 | 2014-01-23 | Benteler Automobiltechnik Gmbh | Method for producing a pipe stabilizer for a motor vehicle |
JP6071132B2 (en) * | 2013-03-28 | 2017-02-01 | Kyb株式会社 | Zygote |
DE202014006861U1 (en) * | 2013-08-23 | 2014-12-01 | Hohenloher Spezial-Maschinenbau GmbH & Co. KG | working machine |
DE102014014436A1 (en) * | 2014-09-29 | 2016-03-31 | Liebherr-Components Kirchdorf GmbH | Lightweight piston rod |
CN104728205A (en) * | 2015-01-23 | 2015-06-24 | 山东隆源液压科技有限公司 | Hydraulic oil cylinder for cantilever crane of pump truck |
JP2017165116A (en) * | 2016-03-14 | 2017-09-21 | 株式会社ショーワ | Trim/tilt device for ship propulsion machine, and ship propulsion machine |
JP6598079B2 (en) * | 2016-12-06 | 2019-10-30 | Smc株式会社 | Rod assembly and fluid pressure device |
-
2016
- 2016-06-21 DE DE102016007593.7A patent/DE102016007593A1/en active Pending
-
2017
- 2017-06-21 WO PCT/EP2017/000723 patent/WO2017220202A1/en unknown
- 2017-06-21 US US16/311,382 patent/US11193511B2/en active Active
- 2017-06-21 EP EP17736564.0A patent/EP3458224A1/en active Pending
- 2017-06-21 AU AU2017280498A patent/AU2017280498B2/en active Active
-
2021
- 2021-11-03 US US17/453,482 patent/US11841034B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US11193511B2 (en) | 2021-12-07 |
DE102016007593A1 (en) | 2017-12-21 |
US11841034B2 (en) | 2023-12-12 |
WO2017220202A9 (en) | 2018-02-22 |
US20220120296A1 (en) | 2022-04-21 |
AU2017280498A1 (en) | 2019-01-17 |
WO2017220202A1 (en) | 2017-12-28 |
AU2017280498B2 (en) | 2023-02-02 |
US20190186507A1 (en) | 2019-06-20 |
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