US1705375A - Crank shaft - Google Patents

Crank shaft Download PDF

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Publication number
US1705375A
US1705375A US270115A US27011528A US1705375A US 1705375 A US1705375 A US 1705375A US 270115 A US270115 A US 270115A US 27011528 A US27011528 A US 27011528A US 1705375 A US1705375 A US 1705375A
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United States
Prior art keywords
crank
web
slit
pin
webs
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Expired - Lifetime
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US270115A
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Ricardo Harry Ralph
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Individual
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    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/06—Crankshafts
    • F16C3/10—Crankshafts assembled of several parts, e.g. by welding by crimping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2173—Cranks and wrist pins
    • Y10T74/2177—Sectional

Definitions

  • This invention relates to crankshafts of the built-up type in which each crank pin is carried at its ends in holes in the adjacent pair of crank webs, a slit extending outwardly from each hole through the portion of the crank web surrounding the crank pin so as to enable the web to be clamped about the end of the pin by one or more bolts or the like tending to close ,up the slit.
  • crankshaft of this type the slit in the crank web has extended completely through the part of the web surrounding the crank pin.
  • the parts of the web on either side of the slit are apt to move relatively to one another in a direction parallel to the crankshaft axis due to the stresses set up in operation, and it is the object of the present invention to provide a more rigid construction in which thisundesirableefi'ect will be reduced or eliminated.
  • thev slit which enables each crank web to be clamped about the adjacent end of the crank pin does not pass completely through the portion'of the web surrounding the pin but a continuous bridge of metal extends across the outer end of' this slit and joins the portions of the crank web on either side thereof.
  • the slit must in all cases be of sufiicient length to permit the flexing of the portions of the crank web on either side thereof by the bolts or the like to 'clampthe web about the crank pin end.
  • The-bridge piece may extend substantially directly across the outer end of the slit but preferably in order to reduce the amount of metal required on the crank web and to enable the bridge piece to be more readily flexed, the crank web is provided with a rib: like projection; extending along its outer end parallel withthe slit, the slit being car- 1 ried into this rib which thus forms a substantially U-shaped bridge piece connecting the portions of the web on each side of the slit.
  • the outer end of the slit may be enlarged to'form a hole so that the complete slit may be said'to have a somewhat keyhole shape, thus facilitating the drawing together about the end of the crank pin of the portions of the web on either side of the slit. Further the portion of each crank web 270,115, and in Great Britain May 2, 1927.
  • crank pin and shaft 1s lying between the crank pin and the shaft 1s preferably reduced in width or waisted so as to render the section of the metal surrounding thepin more uniform and thus enable it to be flexed more evenly to grip v,
  • the invention may be applied to a builtup crankshaft of various types for example those 1n Wh1ch the shaft lengths which connect ad acent cranks are either formed integral with or formed separately from and vention, the shaft itself being shown in section, and, 1
  • Figure 2 is a section on the line 2-2 of Figure 1.
  • crank-- shaft comprises a 'series of plain shaft lengths A two of which are shown.
  • crank webs B On the ends of the shaft lengths A are shrunk or otherwise rigidly secured crank webs B, a plain parallel pin 0 constituting a crank pin being carried at its ends in holes B in each adjacent pair of crank webs as shown.
  • crank webs B are adapted to be clamped about the ends of the crank pin C and to this end a slit or cut D is provided in each Web extending from the hole B
  • the portions of each Web B on each side of the slit D are formed with lugs B through which passes a bolt E provided with a nut E whereby a force can be exerted tending to close up the slit D and thus clamp the end of the crank pin C firmly in the web.
  • two or more bolt holes may be formed in'each lug'B and a corresponding number of clamping bolts provided.
  • each crank web B does not extend completely through the portion of the crank'web surrounding the crankpin C but is only of such length as to leave a continuous bridge piece of metal extendingv across the outer end of the slit so as to connect the portions of the web on either sidethereof.
  • the crank Web is conveniently formed beyond the lugs B on each side of the slit D with a rib-like projection B running parallel with the slit as shown, the slit being of such length that it extends into this rib which thus forms a substantially U-shaped bridge piece connecting the portions of the crank web on each side of the slit.
  • the end of the slit D is further conveniently enlarged as shown at D. The form of the bridge piece thus produced tends to give more readily when the nuts E are tightened to clamp the webs about the crank pin.
  • crank webs are preferably reduced in width or waisted as shown at B so as to render the section of the metal surrounding the crank pin C more uniform and thus enable the webs to be more evenly flexed by the bolts E whereby a more rigid fixing of the crank pins in the webs tends to be effected.
  • crankshafts either'of the multi-throw or single throw type and such crankshafts may be provided with passages through which lubricating oil can be delivered to the various bearing surfaces both for the short shaft lengths A between adjacent cranks and for the crank pin or pins C.
  • the short shaft lengths A are formed hollow, their ends are conveniently plugged as shown at F while oil passages G and G pass from the interior of these shaft lengths respectively to their bearing surfaces A and to the interior of the holes 13 in which the crank pins are mounted.
  • passages G are provided in the crank pins themselves communicating with the oil passages G and adapted to deliver oil to the crank pin bearing surfaces as shown.
  • the arrangement is conveniently such that there is a continuous oil passage extending throughout the length of the crankshaft, the end shaft lengths which each carry only one crank web being provided with means respectively for delivering oil to and withdrawing it from the interior thereof so that a constant flow of lubricating oil under pressure can be maintained through the crankshaft to the hearing surfaces.
  • a built-up crankshaft including in combination a plurality of short shaft lengths, crank webs carried by the ends of these shaft lengths and each having therein a hole adapted to receive the end of a crank pin with a'slit extending outwardly from this hole through the portion of the crank web around it, a curved bridge of metal combination a plurality of short shaft lengths, crank webs carried by the ends of these shaft lengths and each having therein a hole adapted to receive the end of a crank pin with a slit extending outwardly from this hole through the portion of the crank web around it, a curved bridge of metal formed integral withthe crank web extending across the.
  • a built-up crankshaft including in combination a plurality of short shaft lengths, crank webs carried by the ends of these shaft lengths and each having therein a hole adapted to receive the end of a crank.
  • crank pin with a slit extending outwardly from this hole through the ,portion of the crank web around it, a bridge of metal formed integral with the crank web extending across the outer end of each slit so as to join the parts of the web on either side thereof, a crank pin having its ends disposed respectively in the holes in an adjacent pair of crank webs and means for drawing together the parts ofeach web on either side of the slit so as to clamp the web about the end of the crank pin, the portion of each crank web between the crank pin and the short shaft length being reduced in width as and for the purpose set forth.
  • crankshaft including in combination a plurality of short shaft lengths, crank webs carried by the ends of these shaft lengths and each having therein a hole adapted to receive the end of a crank pin with a slit extending outwardly from this hole through the portion of the crank web around it, a curved bridge of metal formed integral with the crank web extending across the outer end of each slit so as to join the parts of the web on either side thereof, a crank pin having its ends disposed respectively in the holes in an adjacent pair of crank webs and at least one bolt serving todraw together the parts of each web on either side of the slit so as to clamp the web about the ends of the crank pin, the portion HARRY RALPH RICARDO.

Description

March 12, 1929. AR 1,705,375
CRANK SHAFT Filed April .14, 1928 Patented Mar. 12, 1929.
UNITED STATES PATENT OFFICE.
CRANK SHAFT.
Application filed- April 14, 1928, Serial m5.
This invention relates to crankshafts of the built-up type in which each crank pin is carried at its ends in holes in the adjacent pair of crank webs, a slit extending outwardly from each hole through the portion of the crank web surrounding the crank pin so as to enable the web to be clamped about the end of the pin by one or more bolts or the like tending to close ,up the slit.
In previous constructions of crankshaft of this type the slit in the crank web has extended completely through the part of the web surrounding the crank pin. With such an arrangement, however, the parts of the web on either side of the slit are apt to move relatively to one another in a direction parallel to the crankshaft axis due to the stresses set up in operation, and it is the object of the present invention to provide a more rigid construction in which thisundesirableefi'ect will be reduced or eliminated.
To this end, according to the present invention, thev slit which enables each crank web to be clamped about the adjacent end of the crank pin does not pass completely through the portion'of the web surrounding the pin but a continuous bridge of metal extends across the outer end of' this slit and joins the portions of the crank web on either side thereof. The slit must in all cases be of sufiicient length to permit the flexing of the portions of the crank web on either side thereof by the bolts or the like to 'clampthe web about the crank pin end.
The-bridge piece may extend substantially directly across the outer end of the slit but preferably in order to reduce the amount of metal required on the crank web and to enable the bridge piece to be more readily flexed, the crank web is provided with a rib: like projection; extending along its outer end parallel withthe slit, the slit being car- 1 ried into this rib which thus forms a substantially U-shaped bridge piece connecting the portions of the web on each side of the slit.
Further, the outer end of the slit may be enlarged to'form a hole so that the complete slit may be said'to have a somewhat keyhole shape, thus facilitating the drawing together about the end of the crank pin of the portions of the web on either side of the slit. Further the portion of each crank web 270,115, and in Great Britain May 2, 1927.
lying between the crank pin and the shaft 1s preferably reduced in width or waisted so as to render the section of the metal surrounding thepin more uniform and thus enable it to be flexed more evenly to grip v,
the pin whereby a more rigid clamping of,
the pin in the Web is ensured.
The invention may be applied to a builtup crankshaft of various types for example those 1n Wh1ch the shaft lengths which connect ad acent cranks are either formed integral with or formed separately from and vention, the shaft itself being shown in section, and, 1
Figure 2 is a section on the line 2-2 of Figure 1.
In the construction illustrated the crank-- shaft comprises a 'series of plain shaft lengths A two of which are shown. On the ends of the shaft lengths A are shrunk or otherwise rigidly secured crank webs B, a plain parallel pin 0 constituting a crank pin being carried at its ends in holes B in each adjacent pair of crank webs as shown. The crank webs B are adapted to be clamped about the ends of the crank pin C and to this end a slit or cut D is provided in each Web extending from the hole B The portions of each Web B on each side of the slit D are formed with lugs B through which passes a bolt E provided with a nut E whereby a force can be exerted tending to close up the slit D and thus clamp the end of the crank pin C firmly in the web. If desired two or more bolt holes may be formed in'each lug'B and a corresponding number of clamping bolts provided. The slit D in each crank web B according to this invention does not extend completely through the portion of the crank'web surrounding the crankpin C but is only of such length as to leave a continuous bridge piece of metal extendingv across the outer end of the slit so as to connect the portions of the web on either sidethereof. Thus the crank Web is conveniently formed beyond the lugs B on each side of the slit D with a rib-like projection B running parallel with the slit as shown, the slit being of such length that it extends into this rib which thus forms a substantially U-shaped bridge piece connecting the portions of the crank web on each side of the slit. The end of the slit D is further conveniently enlarged as shown at D. The form of the bridge piece thus produced tends to give more readily when the nuts E are tightened to clamp the webs about the crank pin.
The crank webs are preferably reduced in width or waisted as shown at B so as to render the section of the metal surrounding the crank pin C more uniform and thus enable the webs to be more evenly flexed by the bolts E whereby a more rigid fixing of the crank pins in the webs tends to be effected. i
The invention may be applied to built-up crankshafts either'of the multi-throw or single throw type and such crankshafts may be provided with passages through which lubricating oil can be delivered to the various bearing surfaces both for the short shaft lengths A between adjacent cranks and for the crank pin or pins C. Thusfor example when, as shown in the drawings, the short shaft lengths A are formed hollow, their ends are conveniently plugged as shown at F while oil passages G and G pass from the interior of these shaft lengths respectively to their bearing surfaces A and to the interior of the holes 13 in which the crank pins are mounted. Further, passages G are provided in the crank pins themselves communicating with the oil passages G and adapted to deliver oil to the crank pin bearing surfaces as shown. The arrangement is conveniently such that there is a continuous oil passage extending throughout the length of the crankshaft, the end shaft lengths which each carry only one crank web being provided with means respectively for delivering oil to and withdrawing it from the interior thereof so that a constant flow of lubricating oil under pressure can be maintained through the crankshaft to the hearing surfaces.
It is to be understood that thedetails of construction may be varied considerably in accordance with the requirements of the engine for which the crankshaft is intended without de arting from this invention.
What I c aim as my invention and desire to secure by Letters Patent is k 1. A built-up crankshaft including in combination a plurality of short shaft lengths, crank webs carried by the ends of these shaft lengths and each having therein a hole adapted to receive the end of a crank pin with a slit extending outwardly from this hole through the portion of the crank web around it, a bridge of metal formed integral with the crank web extending across the outer end of each slit so as to join the parts of the web on either side thereof, a crank pin having its ends disposed respectively in the holes in an adjacent pair of crank Webs and means for drawing tothis hole through the portion of the crank web around it, a bridge of metal formed integral with the crank web extending across the outer end of each slit so as to join the parts of the web on either side thereof, a crank pin having its ends disposed respectively in the holes in'an adjacent pair of crank webs and at least one bolt serving to draw together the parts of each web on either side of the slit so as to clamp the webs about the ends of the crank pin.
3. A built-up crankshaft including in combination a plurality of short shaft lengths, crank webs carried by the ends of these shaft lengths and each having therein a hole adapted to receive the end of a crank pin with a'slit extending outwardly from this hole through the portion of the crank web around it, a curved bridge of metal combination a plurality of short shaft lengths, crank webs carried by the ends of these shaft lengths and each having therein a hole adapted to receive the end of a crank pin with a slit extending outwardly from this hole through the portion of the crank web around it, a curved bridge of metal formed integral withthe crank web extending across the. outer end of each slit so as to join the parts of the web oneither side thereof, a crank pin having its ends disposed respectively in the holes in an adjacent pair of crank webs and at least one bolt serving to draw together the parts of each web on either side of the slit so as to clamp the webs about the ends of the crank 1n. I p 5. A built-up crankshaft including in combination a plurality of short shaft lengths, crank webs carried by the ends of these shaft lengths and each having therein a hole adapted to receive the end of a crank.
pin with a slit extending outwardly from this hole through the ,portion of the crank web around it, a bridge of metal formed integral with the crank web extending across the outer end of each slit so as to join the parts of the web on either side thereof, a crank pin having its ends disposed respectively in the holes in an adjacent pair of crank webs and means for drawing together the parts ofeach web on either side of the slit so as to clamp the web about the end of the crank pin, the portion of each crank web between the crank pin and the short shaft length being reduced in width as and for the purpose set forth.
6. 'A built-up crankshaft including in combination a plurality of short shaft lengths, crank webs carried by the ends of these shaft lengths and each having therein a hole adapted to receive the end of a crank pin with a slit extending outwardly from this hole through the portion of the crank web around it, a curved bridge of metal formed integral with the crank web extending across the outer end of each slit so as to join the parts of the web on either side thereof, a crank pin having its ends disposed respectively in the holes in an adjacent pair of crank webs and at least one bolt serving todraw together the parts of each web on either side of the slit so as to clamp the web about the ends of the crank pin, the portion HARRY RALPH RICARDO.
' of each crank web between the crank pin and v
US270115A 1927-05-02 1928-04-14 Crank shaft Expired - Lifetime US1705375A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131577A (en) * 1955-01-07 1964-05-05 Wilson Mfg Co Crank assembly
US4554893A (en) * 1984-10-01 1985-11-26 General Motors Corporation Lightweight engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131577A (en) * 1955-01-07 1964-05-05 Wilson Mfg Co Crank assembly
US4554893A (en) * 1984-10-01 1985-11-26 General Motors Corporation Lightweight engine

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