US3456391A - Self-centering grinding system particularly suitable for the finishing and repair of large crankshafts - Google Patents

Self-centering grinding system particularly suitable for the finishing and repair of large crankshafts Download PDF

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Publication number
US3456391A
US3456391A US533158A US3456391DA US3456391A US 3456391 A US3456391 A US 3456391A US 533158 A US533158 A US 533158A US 3456391D A US3456391D A US 3456391DA US 3456391 A US3456391 A US 3456391A
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Prior art keywords
grinding
cylinder
bearing
repair
finishing
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Expired - Lifetime
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US533158A
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English (en)
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Attilio Venesia
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/42—Single-purpose machines or devices for grinding crankshafts or crankpins
    • B24B5/425—Single-purpose machines or devices for grinding crankshafts or crankpins in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/42—Single-purpose machines or devices for grinding crankshafts or crankpins

Definitions

  • the present invention is intended to remove such inconveniences and comprises a new system of centreless grinding which provided for equipment capable of grinding eccentric bearings, of connecting rods for example, without it being necessary to dismantle the shaft of the relevant machine, thus reducing the operation to the level of a maintenance operation so that, in the case of a ship, for example, the work may be carried out during a normal discharging or turn-round period without unnecessary loss of use of the same.
  • the grinding equipment which is the object of the invention also presents notable advantages in the grinding of the carrying or main bearings, of the shaft, which normally necessitates the removal of the shaft from the machine. With the said equipment, however, they can be ground by a large, common lathe which can be used for other purposes between one such grinding and the next.
  • the technical principle on which the present invention is based is that a rounded, oval body revolving on two points, which make an angle of less than 180 (in practice, as near 90 as possible) between them can be ground by means of a grinding wheel (usually of the cup type) placed, between the two points ⁇ and be made exactly cylindrical when the grinding wheel is moved forwards so that the diameter of its line of action passes through a point which with the two points on which the body revolves, describes a circle corresponding to the circumference of the body.
  • the grinding device which embodies the said principle, is able to remove 4the protuberances on the body that is, those which have not been removed as a result of wear, and thus reduce the diameter to that corresponding to the maximum distance between the various worn sections.
  • FIGURES 1 and 2 show the technical principle, schematically.
  • FIGURE 3 shows, in lateral elevation an equipment suitable for grinding, on a lathe, the main bearings of a crankshaft.
  • FIGURE 4 shows an analogous equipment for grinding, on a lathe, the big end bearings of a crankshaft.
  • FIGURE 5 shows, in plan view and on a larger scale .an equipment similar to that shown in FIG. 4.
  • FIGURE 6 is a section made along the plane VI-VI of FIG. 5.
  • FIGURE 7 shows the method of application of the said equipment to a large engine so as to be able to grind the big end bearings directly without dismantling the crankshaft.
  • the piece to be ground a big end bearing for example, the said bearing having, as a result of wear caused by the connecting rod, some areas of reduced diameter 1' and, in consequence, some areas having the form of protuberances 1".
  • the bearing 1 rests on support rollers 2 which are placed so as to form an angle of about with respect to the centre of the lbearing.
  • a grinding Wheel 3 preferably of the cup type, the line of abrasive action of which makes a third point of contact on the circumference of the bearing which is to be ground.
  • the said grinding wheel besides its normal rotary movement along the line of abrasive action, is able to be moved towards the piece to be ground, the effective extent of such movement ranging from the first point of contact with the said piece to the point at which the line of abrasive action passes through a circle the circumference of which is determined by the diameter to which the piece is to be ground, the points of lcontact of the two rollers 2 being also located on the same circumference.
  • FIG. 6 a practical example of an assembly for grinding is shown.
  • the bearing to be ground is abig end Ibearing against which press two rollers 2, these being adjustable and mounted on a frame 4, which also carries the supports 5 for other rollers 5 which are pushed against the bearing 1 by springs 7 and only have the task of centering the device by acting in opposition to the rollers 2.
  • the frame 4 also carries a support 6 in which the shaft of the grinding Wheel 3 is mounted.
  • This shaft is provided with known means (not illustrated) to regulate the fom/ard movement of the wheel 3 towards the bearing :1, said means leading to a control wheel 8, and to a pulley 9 and a belt 10 driven by an electric motor 11 which is mounted on an auxiliary support 6 xed to the support 6.
  • This group is connected to the piston rod 12 of a pneumatic or hydraulic cylinder 13 by means of which the Whole assembly of the frame 4 and the elements connected thereto can be moved forwards and backwards in correspondance with the slow rotary movement of the crankshaft on the bearing 1 of which the grinding device is mounted.
  • the cylinder 13 is mounted on its own support 14 by means of pins 15 and thus the whole grinding assembly can take up the different inclinations which are required owing to the movement of the crankshaft, in relation to which the said assembly in fact acts like a connecting rod.
  • the bearing 1 is kept against the rollers 2 while the crankshaft turns slowly.
  • the grinding wheel 3 is made to move towards the shaft while the grinding assembly, the support 14 of which is slidably mounted in the xed support 16 and is controlled by a screw 17 with a worm wheel 17 and a control wheel 18, carries out a side to side movement, as indicated by the arrow A (FIG. so that the grinding wheel 3 travels along the whole length of the bearing. Inv this way the grinding wheel removes any protuberances which are due to wear or, in the case of a new crankshaft, to imperfect manufacture.
  • the bearing 1 and the grinding assembly are mounted on a lathe, the former being .mounted between the centers and held on the lathe bed by suitable rests, while the apparatus is mounted on the carriage (or on one of the carriages) of the lathe by means of the support 14 so that it can work on the bearing 1 which is supported by the rollers 2, 5.
  • a similar form of assembly also permits the lathe grinding of main bearings (FIG. 3). In this case, however, the oscillating action similar to that of a connecting rod is not required and therefore it is not necessary that there should be a hydraulic or a pneumatic cylinder l13 nor, if the lathe is suciently precision-built, is there any need for a frame 4 or the parts connected therewith.
  • FIG. 7 shows the most satisfactory and most advan- Vtageous form of embodiment of the invention and deals with the grinding of a big end bearing of a very large diesel engine; in order to carry out this operation the lateral frame covers, which such engines commonly have to permit access to the connecting rods, are removed.
  • the support 14 is attached laterally to the engine frame and the operation can be carried out as already described.
  • apparatus for grinding a large cylinder comprising a main frame, a split frame pivotally mounted on said main frame for surrounding, and transverse to the axis of, the cylinder; and aflat faced axially rotatable grinding disc adjustably carried'by the split ⁇ fralme ⁇ and arranged with its axis of rotation :onta radius' of the cylinder; and its flat face perpendicular to lsuch radius of the cylinder; and traversing means for traversing the split frame and disc in a ⁇ direction perpendicular: to the rotational axis af the ⁇ disc and parallel to the cylinder axis so that the disc moves along the generating line of the cylinder then engaged by the disc; and means'for adjustably biasing the disc along its own axis of rotation towards the cylinder; the improvement which 'comprises two centerless support rollers vcarried by and inside of the split frame and engaging the cylinder and adpacent the disc, with such support rollers being spaced on radii of the cylinder apart
  • said split frame also carries two spring biased centerless opposition rollers arranged in opposition to the first named support rollers, and at the side of the cylinder remote from the disc and support rollers.
  • said Ibiasing means comprising a hydraulic piston-cylinder means supporting said split frame and biasing it and parts carried by it against the cylinder being ground.
  • the improvement wherein the piston-cylinder means is itself mounted to move longitudinally of the cylinder being ground so as to move the split frame also longitudinally of such cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
US533158A 1965-03-20 1966-03-10 Self-centering grinding system particularly suitable for the finishing and repair of large crankshafts Expired - Lifetime US3456391A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2833565 1965-03-20
IT658665 1965-03-20

Publications (1)

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US3456391A true US3456391A (en) 1969-07-22

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US533158A Expired - Lifetime US3456391A (en) 1965-03-20 1966-03-10 Self-centering grinding system particularly suitable for the finishing and repair of large crankshafts

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US (1) US3456391A (enEXAMPLES)
BE (1) BE678036A (enEXAMPLES)
CH (1) CH436011A (enEXAMPLES)
DE (1) DE1577507A1 (enEXAMPLES)
GB (1) GB1109408A (enEXAMPLES)
NL (1) NL6603554A (enEXAMPLES)
SE (1) SE323906B (enEXAMPLES)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710514A (en) * 1969-12-06 1973-01-16 H Runge Apparatus for superfinishing of rotary crankpins of crankshafts
US3886694A (en) * 1974-09-26 1975-06-03 Us Environment Ascension pipe cleaning apparatus with self-indexing suspension
CN107442783A (zh) * 2017-09-15 2017-12-08 大连渔轮公司 随动式曲轴连杆曲颈部分轴径加工装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109173908B (zh) * 2018-10-19 2023-08-25 山东钢铁股份有限公司 混合机减震装置
CN115781431B (zh) * 2022-12-08 2025-04-29 罡阳轴研科技(灌云)有限公司 一种随动磨削摩托车发动机曲轴连杆颈的装置及其安装方法
CN119304700B (zh) * 2024-12-16 2025-02-14 源创(广州)智能科技有限公司 应用于航空发动机金属导管的抛光工艺

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1304485A (en) * 1919-05-20 Tibe gbooving and finishing machine
US1411181A (en) * 1921-05-02 1922-03-28 Alfred S Weston Machine for regrinding automobile crank shafts
US2102537A (en) * 1936-02-04 1937-12-14 Louis W Kahn Overhead rail cleaner
US2107051A (en) * 1927-04-13 1938-02-01 Ottis R Briney Bushing locating and rotating means
US2314533A (en) * 1941-07-17 1943-03-23 Chrysler Corp Lapping process
US2418871A (en) * 1945-09-17 1947-04-15 Paul F Danielson Apparatus for grinding bushings
US2600815A (en) * 1949-04-20 1952-06-17 Eastman Kodak Co Apparatus for rough and fine grinding of spherical surfaces
US2763967A (en) * 1954-12-15 1956-09-25 A P De Sanuo & Son Inc Abrasive cut-off machine
US3165866A (en) * 1962-11-16 1965-01-19 Golten Sigurd Crankshaft main journal regrinding process

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1304485A (en) * 1919-05-20 Tibe gbooving and finishing machine
US1411181A (en) * 1921-05-02 1922-03-28 Alfred S Weston Machine for regrinding automobile crank shafts
US2107051A (en) * 1927-04-13 1938-02-01 Ottis R Briney Bushing locating and rotating means
US2102537A (en) * 1936-02-04 1937-12-14 Louis W Kahn Overhead rail cleaner
US2314533A (en) * 1941-07-17 1943-03-23 Chrysler Corp Lapping process
US2418871A (en) * 1945-09-17 1947-04-15 Paul F Danielson Apparatus for grinding bushings
US2600815A (en) * 1949-04-20 1952-06-17 Eastman Kodak Co Apparatus for rough and fine grinding of spherical surfaces
US2763967A (en) * 1954-12-15 1956-09-25 A P De Sanuo & Son Inc Abrasive cut-off machine
US3165866A (en) * 1962-11-16 1965-01-19 Golten Sigurd Crankshaft main journal regrinding process

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710514A (en) * 1969-12-06 1973-01-16 H Runge Apparatus for superfinishing of rotary crankpins of crankshafts
US3886694A (en) * 1974-09-26 1975-06-03 Us Environment Ascension pipe cleaning apparatus with self-indexing suspension
CN107442783A (zh) * 2017-09-15 2017-12-08 大连渔轮公司 随动式曲轴连杆曲颈部分轴径加工装置

Also Published As

Publication number Publication date
NL6603554A (enEXAMPLES) 1966-09-21
GB1109408A (en) 1968-04-10
DE1577507A1 (de) 1970-11-05
BE678036A (enEXAMPLES) 1966-09-01
CH436011A (it) 1967-05-15
SE323906B (enEXAMPLES) 1970-05-11

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