US3562966A - Crankpin finishing apparatus - Google Patents

Crankpin finishing apparatus Download PDF

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Publication number
US3562966A
US3562966A US745025A US3562966DA US3562966A US 3562966 A US3562966 A US 3562966A US 745025 A US745025 A US 745025A US 3562966D A US3562966D A US 3562966DA US 3562966 A US3562966 A US 3562966A
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US
United States
Prior art keywords
crankpin
finishing
stones
members
crankshaft
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
US745025A
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English (en)
Inventor
Rudolf Schwar
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.)
Ernst Thielenhaus GmbH and Co KG
Original Assignee
Ernst Thielenhaus GmbH and Co KG
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
Application filed by Ernst Thielenhaus GmbH and Co KG filed Critical Ernst Thielenhaus GmbH and Co KG
Application granted granted Critical
Publication of US3562966A publication Critical patent/US3562966A/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

  • a grinding device of some kind is usually used in cooperation with a lathe that rotates a crankshaft.
  • the grinding device is generally arranged in a housing that moves freely somewhat like a piston to follow the crankpin as the crankshaft is rotated.
  • a simple band of abrasive paper or cloth is looped over the crankpin and held tightly so that, as the crankpin turns, it automatically grinds the crankpin surface or journal.
  • one or more small grinding stones are urged into contact with the surface of the crankpin by, for example, hydraulic pressure, springs, or simply gravity.
  • crankpins which not only enables microfinish or superfinish grinding, but also corrects irregularities of roundness of the crankpin.
  • This object is attained according to the main feature of my invention by grinding the crankpin with several, preferably at least three, finishing stones which are positively coupled together so that their grinding surfaces always lie on the circumference of a common circle whose center point is always at the same place in relation to the support or housing for the stones.
  • This mechanism is used in cooperation with a turning mechanism (e.g. a lathe) and the grinding device itself is mounted to move with the crankpin as the crankshaft is rotated.
  • a turning mechanism e.g. a lathe
  • These three finishing stones are mounted on racks connected together by two gear trains and are angularly equispaced with an angle of 120 between them, as in a threejaw chuck.
  • One of the racks is connected to a hydraulic servomotor that regulates the spacing of all three stones through the gear trains and drives the stones radially inwardly with positive force.
  • the servomotor which drives a threaded spindle, forms a positive drive analogous to a lathe leadscrew for advancing the stones independently of 3,562,966 Patented Feb. 16, 1971 the original contour of the crankpin. Joint retraction of all three stones allows a crankpin to be admitted into a slot in the jawlike housing and between the stones.
  • a plurality of these grinding or finishing devices can be provided to simultaneously finish all the journals on a crankshaft. Making the devices adjustable laterally and as to height makes it possible to use one grinding or finishing apparatus for crankshafts of varied dimensions.
  • FIG. 1 is an elevational view of a grinding apparatus according to my invention
  • FIG. 2 is a side view of a detail of the FIG. 1 apparatus.
  • FIG. 3 is a section through a detail of the FIG. 1 apparatus, taken along line IIIIII of FIG. 1.
  • FIG. 1 shows a crankshaft 2 consisting of a plurality of crankpins 1 between webs 5.
  • This crankshaft 2 is held by its ends 2a and 2b between a driving plate (faceplate) 3a in a headstock 4 and the dead center of a movable tailstock 3b of a lathe bed.
  • Engaging two of these crankpins 1 are jaw-shaped supports or housings 6 which are carried between two guide plates 20 guided by means of frames 24 transfixed by pins 22 through a slot 21 (FIG. 2), the pins 22 being fixed in the plates 20 and slidable in the slot 21.
  • These plates 20 are laterally slidable on rails 29 and 30 by means of carriages 19a and 19b. The lateral motion can be arrested by stop screws 19c.
  • Up-anddown (vertical) motion of the plates 20 is controlled by lockable cross-slides 27 mounted on the upper slides 19a.
  • FIGS. 2 and 3 show the particular structure of the grinding device of my invention.
  • Three finishing stones 7 are fitted into three holders 9 in turn fitted onto three coplanar racks 11, 12 and 13.
  • the racks 11, 12 and 13 have bolts 9a passing longitudinally through them which threadedly engage in the rear of the holders and allow them to be replaced.
  • crankshaft 2 The ends 211 and 2b of the crankshaft 2 are connected between the plate 3a and the tailstock 3b, the latter being axially shiftable for properly receiving and clamping the end 211.
  • the plates 20 are slid laterally on the slides 19a and 1% until the housing 6 passes between the webs 5 defining the crankpin 1 to be finished, being then locked in place by the lockscrew 190. If necessary, the housing 6 can be adjusted for the proper up-and-down movement by means of a locking cross slide 27.
  • the servomotor 14 is subsequently actuated to pull the rod 25 and rack 11 in the radially outward direction A, thereby withdrawing all the stones 7.
  • the housing 6 is manipulated to fit a mouth-like opening 10 over the crankpin 1, care being taken that the housing 6 does not brush against one of the webs 5 and is not canted when set. If this occurs, the slides 19a and 1% should be readjusted.
  • the motor 14 is now reversed to move the rod 25 and rack 11 in the inward direction B to bring the stones 7 into contact with the surface of the crankpin 1.
  • An apparatus for the surface finishing of a crankpin comprising:
  • a support movable in a plane perpendicular to said axis; three pressure members movable for radial engagement with said pin and mounted on said support, at least one of said members being formed as a tool, said members being angularly spaced about said pin;
  • An apparatus for the surface finishing of a crankpin comprising:
  • said support including two spaced, parallel plates, said members being mounted between said plates, said plates being formed with an open-ended slot, said crankpin being receivable between said members in said slot, said means for rotating said crankpin being a lathe.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Turning (AREA)
US745025A 1967-07-15 1968-07-15 Crankpin finishing apparatus Expired - Lifetime US3562966A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM0074766 1967-07-15

Publications (1)

Publication Number Publication Date
US3562966A true US3562966A (en) 1971-02-16

Family

ID=7315879

Family Applications (1)

Application Number Title Priority Date Filing Date
US745025A Expired - Lifetime US3562966A (en) 1967-07-15 1968-07-15 Crankpin finishing apparatus

Country Status (2)

Country Link
US (1) US3562966A (de)
DE (1) DE1652112B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61188059A (ja) * 1985-02-16 1986-08-21 Honda Motor Co Ltd 超仕上工具
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3242095C2 (de) * 1982-11-13 1986-02-20 Ernst Thielenhaus KG, 5600 Wuppertal Schleifmaschine für das Feinschleifen einer Kurbelwelle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1711061A (en) * 1925-06-17 1929-04-30 Norton Co Crank-shaft-lapping machine
US2138258A (en) * 1937-02-06 1938-11-29 Edward W Oliver Crankshaft grinding apparatus
US2258571A (en) * 1940-01-12 1941-10-07 Norton Co Crankshaft lapping machine
CH306719A (fr) * 1952-12-31 1955-04-30 Ernst Edouard Machine à rectifier les surfaces cylindriques d'organes rotatifs.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61188059A (ja) * 1985-02-16 1986-08-21 Honda Motor Co Ltd 超仕上工具
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
DE1652112B1 (de) 1970-12-23

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