US2202111A - Machine for grinding the crank pins of crankshafts - Google Patents

Machine for grinding the crank pins of crankshafts Download PDF

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Publication number
US2202111A
US2202111A US242067A US24206738A US2202111A US 2202111 A US2202111 A US 2202111A US 242067 A US242067 A US 242067A US 24206738 A US24206738 A US 24206738A US 2202111 A US2202111 A US 2202111A
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US
United States
Prior art keywords
grinding
crank
machine
support
bearing
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Expired - Lifetime
Application number
US242067A
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English (en)
Inventor
Mayer Carl
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.)
RUDOLF NOLLE
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RUDOLF NOLLE
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 RUDOLF NOLLE filed Critical RUDOLF NOLLE
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Publication of US2202111A publication Critical patent/US2202111A/en
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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
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems

Definitions

  • This invention relates to a machine for grinding the crank pins for crank shafts and according to the invention the grinding is effected by the fiat front face of a grinding wheel having its axis perpendicular to the axis .of the bearing, the
  • crank shaft being rota-tably supported in adjusta'ble bearing clamps; the grinding wheel being arranged opposite the bearing clamps, the latter being. slidably mounted on a vertical support whereby the crank shaft is supported and ground in a vertical position.
  • crank shaft By arranging the crank shaft in this manner a number of disadvantages of the hitherto usual horizontal arrangements are avoided and a number of considerably improved advantages are obtained.
  • crank pins which do not run true, it is possible to produce a finished precision grinding which, as regards quality, uniformity and accuracy, can otherwise only be at- 0 tained with large, heavy and consequently expensive precision grinding machines.
  • this result can be attained with a small, inexpensive, transportable, grinding machine which is easy to operate.
  • crank shaft to be worked is, according to a further feature of the invention, set up for grinding purposes, on a rotatable face plate which not only rotates the crank shaft, but also lifts and lowers axially.
  • the crank shaft then rotates (relieved of its own weight) in bearings, the dis- :tance between which is adjustable and which are sliclably arranged ona vertically disposed support.
  • the counter-support element which canalso be in the form of a roller--is so turned or displaced that the supporting line no longer lies in the plane formed by the axis of the crank pin and the line of contact of the' is always essential for holding the crank pin, so
  • the new theory consists in that the point of support is only displaced by a few degrees from the plane formed by the center line of. the crank pin and the line of contact of the grinder, preferably by about 2 to 10.
  • the bottom end of the crank shaft stands in a driving device on a lifting plate which at the same time also imparts the turning movement to the crank shaft.
  • This driving device is conveniently mounted to slide radially in the driving disc, with the result that the driving device can immediately adjust itself to the crank stroke of the crank shaft being worked, as well as to the small movements which the crank shaft carries out in the bearing at the commencement of the grinding due to its initial inaccuracy.
  • crank shafts having only one crank pin bearing as in single-cylinder engines or engines having oppositely moving pistons, and also with crank shafts having a. plurality of cranked portions, none of which lie in the same plane as the others, i. e., the crank shaft .of the Ford V-8 engine
  • the driving and supporting of the end crank pin of the crank shaft is effected by means of an extending angle member which replaces the second missing bearing.
  • one of the outside main bearings is placed in the angle prism, which is slidably mounted on the lifting plate. It is possible in this way to insure an exactly vertical position of the crank shaft with respect to the lifting plate. If the crank pin to be ground is now placed in the suitably adjusted bearing clamp, the sliding angle prism also adjusts itself to the corresponding stroke. After adjustment has been made, it is still not necessary to fix the angle prism to the faceplate.
  • the third point of support is conveniently constituted by an interchangeable hard rubber or fiber plate. If it is not required, for example, with crank shafts not having a lubrication groove, the fibre plate is replaced by a felt plate with the result that this continuously keeps the grinding dust away from the supporting surface in the bearing clamps.
  • Figure 1 is a part elevational and part sectional View of one embodiment with a crank shaft set up on the rotatable table or face plate.
  • Figure 2 is a plan view of the grinding device on the line IIII of Figure 1.
  • Figure 3 is a similar view on the line IIIIII of Figure 1, showing the adjustable and displaceable mounting with a measuring dial, and
  • Figure 4 is a longitudinal section through another form of grinding machine base, with the drive for the face plate and an adjustable eccentric for raising and lowering the face plate.
  • Figure 5 is a part elevational and part sectional View of a further embodiment of the centerless grinding machine for the grinding of crank pins in the vertical position with a driving device displaceable radially in the face plate.
  • Figure 6 shows the same face plate in side elevation.
  • Figure 7 is an elevation of a face plate having a radially displaceable angle prism for defining the vertical portion of a crank shaft which is guided at one place at its upper end.
  • Figure 8 is a plan view of a grinding device on the line VIII-VIII of Figure 5 and having a counter-support surface arranged out of parallel with the flat working face of the grinding body.
  • Figure 9 shows on an enlarged scale the parts of the grinding device shown in Figure 8 and which are arranged around the crank pin to be ground, and
  • Figures 10 and 11 each show a diagrammatic horizontal section through a crank pin in the grinding position with the novel arrangement of the counter-support roller and counter-support surface, respectively.
  • the grinding machine comprises a supporting pillar I', mounted on a base 2 and rotatable table or plate 3 displaceably mounted in a bearing bush 4 provided with worm gearing driven from a motor 5, said bearing bush 4 setting the face plate 3 in slow rotation.
  • the face plate 3 includes a pin 3' reciprocally mounted in the bearing bush 4 so that the pin in the bearing bush 4 and the face plate can be reciprocated in a vertical plane in the bush 4 during the turning movement.
  • this reciprocating movement is effected manually by means of a lever 6 through the linkage I actuated from a handle 8 at the top of the pillar I.
  • the raising and lowering of the crankshaft 9 is effected automatically with the turning movement and to assist such movement a counter-weight I0 is provided in order to facilitate the raising and lowering of the crank shaft 9.
  • an adjustable eccentric 23 is driven by the motor 5 through a worm 2i and a worm wheel 22 so that, through the lever 24 the upward and downward reciprocating movement of the face plate takes place simultaneously with the actuation thereof.
  • the adjustable eccentric is also indicated by the reference numeral 23.
  • it acts directly on the pin of the face plate and, by means of a gearing connected with the hand-wheel 36, is exteriorly adjustable according or carriage [3.
  • the entire grinding assembly (motor, spindle and grinding wheel) is so arranged that the mean axis of the spindle I5 is displaced relatively to that of the crank shaft 9, and the grinding line of contact is formed by a chord of the grinding wheel.
  • the spindle is mounted without play at more than one point and is directly driven at the upper end through a flexible coupling from the high-speed motor I 4.
  • One of the two supports carries a measuring gauge I! of approved type for controlling the grinding operation.
  • crank shaft 9 The exact adjustment and alignment of the crank shaft 9 is attained by suitable adjustment of the slidable bearings lB-l9 which are arranged at an angle of 45 to the bracket ll--
  • the supports 20 retain the crank shaft in the bearing clamp.
  • the rotating crank shaft 9 is, as previously described, simultaneously reciprocated in a vertical plane so that the entire surface of a crank pin is contacted by the grinding wheel which remains in one position.
  • the supporting bracket l2 including the grinding device l8, 13, I4, I5, l6 carried thereby, are mounted on a stationary rigid plate-like frame element which closely surrounds the crank pin over about half of its circumference, and from the inner edge of which the operating parts acting upon the crank pin being ground, i. e., the grinding wheel I6 and the counter-support checks 13, project only a short distance, and on the inner walls of which the first internal mounting of the grinding spindle I5 is already provided.
  • Figures 10 and 11 show two different embodiments having counter-support rollers r r 1 and counter-support surfaces g g g respectively, and show the manner in which intensification of small irregularities of the bearing a can be avoided by lateral displacement of the countersupport line which is exactly opposite the grinding line a, into a slightly lateral position 0
  • the line of counter-support c of the steady roller 1' is disposed diametrically opposite the line of grinding a, as was always the case hith erto
  • thetwo radial connecting lines m, n from the center point b of the crank pin to the line of grinding a on the one hand, and to the line of counter-support on the other hand form an angle of 180, or if the surface g extends parallel to the working face 24 of the grinding wheel it, and if a depression has been formed onthe surface of the crank pin 2, for example by careless setting of the grinding Wheel 46, then after the crank pin a has turned through 180, this depression causes a protuberance to be formed on the dia
  • the driving device in the form of a center pin 35, is mounted to slide radially in the driving disc 3, said center pin 35 being fixed on a slide which, in turn, is freely displaceable in a radial groove 35 formed in the face plate 3.
  • an angle prism 38 is employed as the driver instead of the center pin.
  • the crank shaft 9, which is placed in a bearing clamp, is held in the single prism 38 by one of its end crank pins.
  • three supporting points 3!, 32, 33 are provided on the machine opposite the grinding wheel I6.
  • Two of these points (3!, 32) serve as usual for the accurate alignment of the crank shaft, whereas the third (33) acts as an auxiliary supporting point merely for maintaining the adjusted position of the crank pin when the other supporting point 3
  • a machine according to claim 1 characterized in that the grinding wheel is adjustable during grinding in the direction of its rotation axis.
  • a machine of the character described comprising a base, a vertical support thereon, a pair of brackets vertically adjustable on the support, a plate-like frame on the brackets having means for closely embracing a crank pin over approximately one-half its circumference, grinding means on the plate and projecting slightly from the inneredge of the plate, means for actuating the grinding means, a rotatable face plate carried by the base, means for raising and lowering the face plate, and said face plate having driving and support means for a crank shaft.
  • a machine characterized by a driving device in the form of an angle prism, in which the crank shaft, placed in a bearing clamp, is secured by one of its free end crank pins.
  • crank shaft two of which act for exact alignment of the crank shaft, and'the third functioning as an auxiliary supporting point for maintaining a fixed position when one of the other two supporting points becomes temporarily inoperative.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US242067A 1936-07-22 1938-11-23 Machine for grinding the crank pins of crankshafts Expired - Lifetime US2202111A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2202111X 1936-07-22
DE1936M0135198 DE700529C (de) 1936-07-22 1936-07-23 Maschine zum Schleifen der Zapfen gekroepfter Wellen
GB25282/38A GB514022A (en) 1936-07-22 1938-08-29 A machine for grinding the crank pins of crankshafts

Publications (1)

Publication Number Publication Date
US2202111A true US2202111A (en) 1940-05-28

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ID=61012513

Family Applications (1)

Application Number Title Priority Date Filing Date
US242067A Expired - Lifetime US2202111A (en) 1936-07-22 1938-11-23 Machine for grinding the crank pins of crankshafts

Country Status (4)

Country Link
US (1) US2202111A (en)van)
BE (1) BE430747A (en)van)
DE (1) DE700529C (en)van)
GB (1) GB514022A (en)van)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE903315C (de) * 1942-09-15 1954-02-04 Schuette Fa Alfred H Maschine zum Ausschleifen von Zentrierbohrungen u. dgl.
CN115041967A (zh) * 2022-07-01 2022-09-13 安庆中船动力配套有限公司 一种曲轴安装孔高精度镗铣装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3415689C1 (de) * 1984-04-27 1985-08-22 Maschinenfabrik Ernst Thielenhaus GmbH, 5600 Wuppertal Rotations- und Oszillationsantrieb fuer ein zu bearbeitendes Werkstueck an einer Feinschleifmaschine fuer Wellen,insbes. fuer Kurbelwellen,Nockenwellen und aehnliche Werkstuecke
CN106181710B (zh) * 2016-08-24 2018-06-19 佛山市顺德区北滘镇广鑫运动用品有限公司 一种五金制作用不锈钢快速打磨装置
CN107414636A (zh) * 2017-09-29 2017-12-01 侯马市东鑫机械铸造有限公司 曲轴小端面磨削设备
CN112975589A (zh) * 2021-03-13 2021-06-18 杭州江滨内燃机配件有限公司 一种提高曲轴轴颈同轴度的加工工艺

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE903315C (de) * 1942-09-15 1954-02-04 Schuette Fa Alfred H Maschine zum Ausschleifen von Zentrierbohrungen u. dgl.
CN115041967A (zh) * 2022-07-01 2022-09-13 安庆中船动力配套有限公司 一种曲轴安装孔高精度镗铣装置
CN115041967B (zh) * 2022-07-01 2023-09-19 安庆中船动力配套有限公司 一种曲轴安装孔高精度镗铣装置

Also Published As

Publication number Publication date
DE700529C (de) 1940-12-21
GB514022A (en) 1939-10-27
BE430747A (en)van) 1938-11-30

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