US3352065A - Machine for grinding crankshafts - Google Patents

Machine for grinding crankshafts Download PDF

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Publication number
US3352065A
US3352065A US422480A US42248064A US3352065A US 3352065 A US3352065 A US 3352065A US 422480 A US422480 A US 422480A US 42248064 A US42248064 A US 42248064A US 3352065 A US3352065 A US 3352065A
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US
United States
Prior art keywords
crankshaft
grinding
machine
throw
ground
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.)
Expired - Lifetime
Application number
US422480A
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English (en)
Inventor
Enkelmann Walter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henschel Werke AG
Original Assignee
Henschel Werke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to NL6410508A priority Critical patent/NL6410508A/xx
Priority to CH1251664A priority patent/CH415335A/de
Priority to BE654464D priority patent/BE654464A/fr
Priority to GB42317/64A priority patent/GB1075707A/en
Priority claimed from GB42317/64A external-priority patent/GB1075707A/en
Application filed by Henschel Werke AG filed Critical Henschel Werke AG
Priority to US422480A priority patent/US3352065A/en
Application granted granted Critical
Publication of US3352065A publication Critical patent/US3352065A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

  • This invention relates to a machine for grinding crankshafts in which a grinding wheel mounted on a rocker arm forcibly follows a crankshaft throw to be ground due to the fact that the center of the throw is in alignment with an eccentric pin, which latter is directly connected to the grinding wheel through a connecting rod and a rocker shaft. As a result, the grinding wheel will follow a predetermined geometrical path independent of the position of the crankshaft throw to be ground.
  • crankshaft rotates about the main bearings thereof while the center of the grinding wheel, rotating within a drum and being eccentrically positioned, follows the center of the throw to be ground at the same distance and in the same angular position.
  • This method eliminates the drawbacks aforementioned since the crankshaft rotates about the normal axis thereof and, accordingly, does not transmit any unbalance to the machine; sagging is eliminated by means of steady rests at the main bearings.
  • FIGURE 1 is a view in elevation of one embodiment of a machine in accordance with the present invention
  • FIGURE 2 is a top view of the machine of FIGURE 1,
  • FIGURE 3 is a sectional view showing a detail of the advancing means for the grinding wheel
  • FIGURE 4 is a sectional view showing a detail of the rocker shaft which supports the grinding wheel.
  • a crankshaft to be ground is mounted for rotation about the axis 1 thereof, i.e., about the main bearings thereof, and may thus be supported at the main bearings by the steady rest 2.
  • the connecting rod 10 having a sliding block mounted therein is moved by means of the rotatable eccentric pin 7.
  • the sliding block is adapted to be shifted and to be locked in position by means of a threaded shaft passing therethrough while being supported on slide bars, all as shown in FIGURE 3.
  • the sliding block is connected on both sides thereof, by means of a pair of pivots, with a bifurcated crank arm which is keyed to a rocker shaft 12.
  • the grinding wheel 3, mounted in the rocker arm 5 forcibly follows the throw 6 of vthe crankshaft to be ground due to the fact that the center of the crankshaft throw, the position of which corresponds to the position of the eccentric pin 7 at the end of the headstock 8, is connected with the rocker arm 5 through the connecting rod 10 and the rocker shaft 12.
  • the bearings 11 of the torsion-proof rocker shaft 12 are positioned in the lower part of the machine frame 13.
  • the bearings and rocker shaft may, however, be mounted in a position offset by about above the grinding wheel 3 so that a type of jointed cross-shaft axle is obtained having certain dynamic advantages.
  • the rocker shaft 12 also serves as a guide or track whereby the grinding wheel 3 may be axially displaced with respect to the throws on the crankshaft.
  • Advancing of the grinding wheel 3 in a radial direction is effected by an advancing drive 15 mounted in the connecting rod 10, as shown in FIGURE 3.
  • This advancing drive changes the center distance or axle base of the grinding wheel with respect to the eccentric 7 mounted on the headstock 8 and, thus, also changes the distance of the grinding wheel from the crankshaft throw to be ground.
  • the distance is set equal to the radius of the grinding wheel plus one-half of the diameter of the crankshaft throw.
  • the advance in the tangential direction i.e., round feed or advance
  • this error which causes the speed of the round advance to assume a flat sinusoidal curve, manifests itself as an impermissible difference in the surface quality between the side which faces and is turned away, respectively, from the main center of the crankshaft, the rotary motion, i.e., the speed of rotation of the crankshaft is caused to assume a sine-shaped path or course in the inverse sense using the control device 16 which regulates the speed of the driving motor 23, whereby this error can be largely eliminated.
  • the drive 17 on the tailstock end is not synchronized but, instead, a controllable constantly-acting torsional moment is applied-to the crankshaft which is independent of the speed of rotation.
  • This drive is either hydraulic or mechanical through a clutch having an adjustable torsional moment.
  • This type of drive may be employed since a residual torsional moment may be present in the crankshaft without exerting an adverse effect on the accuracy of thethrow to be ground.
  • a further advantage of the machine of the present invention resides in the fact that when successively grinding several throws which are offset from the crankshaft axis by x with respect to each other, the rigid connection 18 between the headstock and the crankshaft need not be disengaged or released. Instead, the eccentric 7 at the other end of the headstock from the connection 18 'is. rotated" by x about the center of the headstock, using the shifting device 19, in order to attain the next angular position corresponding to the position of the succeeding crankshaft throw.
  • the eccentric 7 is mounted on the shifting device 19 in a manner such that the stroke of the eccentric, is controllable or adjustable by the adjusting means 20. in accordance with the stroke of the crankshaft throw. In a stroke position of zero, i.e., at a position of zero eccentricity, it is possible to also grind the main bearings of the crankshaft on the same machine, which is. not possible on machines of conventional construction.
  • a device 21 for removing the grinding wheel and a measuring device 22 for measuring the roundness of the crankshaft throw during the grinding operation are mounted on the rocker arm on which the grinding wheel is: mounted.
  • a machine for grinding crankshafts comprising a frame, means for rotatably supporting a crankshaft to be ground, means for rotating the crankshaft, grinding means mounted on a torsion-proof rocker shaft and adapted to contact a throw on the crankshaft to be ground, and means for axially displacing the grinding means on the rocker shaft.
  • a machine according to claim 1 including means for regulating the speed of the means for rotating the crankshaft.
  • a machine in. which the grinding means is connected by means of a connecting rod to a rotatable eccentric supported by aheadstock onthe frame.
  • a machine according to claim 5 including means on the connecting rod for advancing the grinding means toward a throw to be ground. 7; A machine according to claim 5 including shifting means for adjusting the angular position of the eccentric, whereby successive throws on the crankshaft may be,
  • a machine according to claim 5 including means for adjusting the degree of eccentricity of the eccentric.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US422480A 1964-09-09 1964-11-19 Machine for grinding crankshafts Expired - Lifetime US3352065A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL6410508A NL6410508A (enExample) 1964-09-09 1964-09-09
CH1251664A CH415335A (de) 1964-09-09 1964-09-25 Kurbelwellenschleifmaschine
BE654464D BE654464A (fr) 1964-09-09 1964-10-16 Machine a rectifier les vilebrequins
GB42317/64A GB1075707A (en) 1964-10-16 1964-10-16 Improvements in or relating to grinding machines
US422480A US3352065A (en) 1964-09-09 1964-11-19 Machine for grinding crankshafts

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL6410508A NL6410508A (enExample) 1964-09-09 1964-09-09
CH1251664A CH415335A (de) 1964-09-09 1964-09-25 Kurbelwellenschleifmaschine
GB42317/64A GB1075707A (en) 1964-10-16 1964-10-16 Improvements in or relating to grinding machines
US422480A US3352065A (en) 1964-09-09 1964-11-19 Machine for grinding crankshafts

Publications (1)

Publication Number Publication Date
US3352065A true US3352065A (en) 1967-11-14

Family

ID=61013925

Family Applications (1)

Application Number Title Priority Date Filing Date
US422480A Expired - Lifetime US3352065A (en) 1964-09-09 1964-11-19 Machine for grinding crankshafts

Country Status (4)

Country Link
US (1) US3352065A (enExample)
BE (1) BE654464A (enExample)
CH (1) CH415335A (enExample)
NL (1) NL6410508A (enExample)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337011A (en) * 1979-04-18 1982-06-29 Gebrueder Heller, Maschinenfabrik Gmbh Crankshaft milling machine
EP0170764A1 (fr) * 1984-07-17 1986-02-12 Luciano Barbisan Rectifieuse pour vilebrequins de moteurs à explosion et diesel
WO2002034466A1 (de) * 2000-10-23 2002-05-02 Boehringer Werkzeugmaschinen Gmbh Kombimaschine
US20110010124A1 (en) * 2009-07-08 2011-01-13 Heinz Wegmann Method for determining the shape of a workpiece
US20110119943A1 (en) * 2009-09-22 2011-05-26 Yan Arnold Measuring device
US8429829B2 (en) 2010-03-26 2013-04-30 Hommel-Etamic Gmbh Measuring device
US9393663B2 (en) 2010-08-23 2016-07-19 Hommel-Etamic Gmbh Measuring device
US9562756B2 (en) 2012-09-20 2017-02-07 Jenoptik Industrial Metrology Germany Gmbh Measuring device with calibration

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US923732A (en) * 1907-12-21 1909-06-01 Ernst Thunberg Method and means for working eccentrically-rotating parts.
US1813503A (en) * 1927-10-03 1931-07-07 Motch Merryweather Machinery Grinding machinery
US1844805A (en) * 1930-09-24 1932-02-09 Herbert M Sims Sag eliminating attachment for crank shaft grinding machines
US2071882A (en) * 1934-07-16 1937-02-23 Henry A Kremer Grinding machine
US2232229A (en) * 1940-05-20 1941-02-18 Leblond Mach Tool Co R K Crankpin grinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US923732A (en) * 1907-12-21 1909-06-01 Ernst Thunberg Method and means for working eccentrically-rotating parts.
US1813503A (en) * 1927-10-03 1931-07-07 Motch Merryweather Machinery Grinding machinery
US1844805A (en) * 1930-09-24 1932-02-09 Herbert M Sims Sag eliminating attachment for crank shaft grinding machines
US2071882A (en) * 1934-07-16 1937-02-23 Henry A Kremer Grinding machine
US2232229A (en) * 1940-05-20 1941-02-18 Leblond Mach Tool Co R K Crankpin grinder

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337011A (en) * 1979-04-18 1982-06-29 Gebrueder Heller, Maschinenfabrik Gmbh Crankshaft milling machine
EP0170764A1 (fr) * 1984-07-17 1986-02-12 Luciano Barbisan Rectifieuse pour vilebrequins de moteurs à explosion et diesel
WO2002034466A1 (de) * 2000-10-23 2002-05-02 Boehringer Werkzeugmaschinen Gmbh Kombimaschine
US20040023600A1 (en) * 2000-10-23 2004-02-05 Anton Horsky Multi-purpose machine
US6926591B2 (en) 2000-10-23 2005-08-09 Boehringer Werkzeugmaschinen Gmbh Multi-purpose machine
US20110010124A1 (en) * 2009-07-08 2011-01-13 Heinz Wegmann Method for determining the shape of a workpiece
US8725446B2 (en) 2009-07-08 2014-05-13 Hommel-Etamic Gmbh Method for determining the shape of a workpiece
US20110119943A1 (en) * 2009-09-22 2011-05-26 Yan Arnold Measuring device
US8336224B2 (en) 2009-09-22 2012-12-25 Hommel-Etamic Gmbh Measuring device
US8429829B2 (en) 2010-03-26 2013-04-30 Hommel-Etamic Gmbh Measuring device
US9393663B2 (en) 2010-08-23 2016-07-19 Hommel-Etamic Gmbh Measuring device
US9562756B2 (en) 2012-09-20 2017-02-07 Jenoptik Industrial Metrology Germany Gmbh Measuring device with calibration

Also Published As

Publication number Publication date
NL6410508A (enExample) 1966-03-10
CH415335A (de) 1966-06-15
BE654464A (fr) 1965-02-15

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