Patent US3673651A successfully refreshed from Google Patents.
US3673651A
Expired / Lapsed
US
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Crankshaft balance weights and method of assembly
Assignee: Perkins Ltd
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Filing: 1970-04-09
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Granted: 1972-07-04
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Expires: 1990-04-09
Abstract
Abstract A crankshaft is formed with stub web portions for attachment of balance weights. The crankshaft bearing surfaces are ground and then the weights are electron beam welded to the web portions, which have a stepped configuration to enable indexing for sequential weight welding. After hardening trimmer plates are fastened to the weights axially of the crankshaft to complete the balancing. This provides an inexpensive, easily machined, accurately balanced crankshaft.
Inventors
- 👤 William F Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:36
CPC Classifications
B; B23; B23K; B23K15/00; B23K15/0046; F; F16; F16C; F16C3/00; F16C3/04; F16C3/20; F16F; F16F15/00; F16F15/28; F16F15/283; B23K2101/00; B23K2101/005; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; Y; Y10; Y10S; Y10S29/00; Y10S29/901; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49286; Y10T74/00; Y10T74/21; Y10T74/2173; Y10T74/2183
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
124 words
A method of making a crankshaft comprising the steps of forming journal, crankpin and web portions providing balance weights, providing on the balance weights and on the web portions respectfully, mutually engageable surfaces each having at least one rectilinear dimension arranged so as to permit local welding by beamed means aligned with the locus of the said dimension in a direction which is generally transverse to the general plane of the associated web portion, and positioning said locus and beamed means so as to space it away from any parts of the crankshaft other than the web portion to minimize interference with the beamed means to enable successive welding of each one of the balance weights while their respective surfaces are in mutual engagement.
Claim 2
Independent Claim
124 words
A method of making a crankshaft comprising the steps of forming journal, crankpin and web portions providing balance weights, providing on the balance weights and on the web portions respectfully, mutually engageable surfaces each having at least one rectilinear dimension arranged so as to permit local welding by beamed means aligned with the locus of the said dimension in a direction which is generally transverse to the general plane of the associated web portion, and positioning said locus and beamed means so as to space it away from any parts of the crankshaft other than the web portion to minimize interference with the beamed means to enable successive welding of each one of the balance weights while their respective surfaces are in mutual engagement.
Claim 3
Independent Claim
76 words
A method of making a crankshaft comprising the steps of forming a crankshaft body with journal portions, crankpin portions and web portions, machining the journal portions, providing primary balance weights and welding these to at least some of the web-portions, balancing the body with the primary balance weights attached, subjecting parts of the body to surface hardening treatment, providing trimmer plates of predetermined weight and dimensions, and attaching the trimmer plates to the primary balance weights.
Claim 4
Independent Claim
76 words
A method of making a crankshaft comprising the steps of forming a crankshaft body with journal portions, crankpin portions and web portions, machining the journal portions, providing primary balance weights and welding these to at least some of the web-portions, balancing the body with the primary balance weights attached, subjecting parts of the body to surface hardening treatment, providing trimmer plates of predetermined weight and dimensions, and attaching the trimmer plates to the primary balance weights.
Claim 5
Dependent Claim
38 words
The method according to claim 2, wherein each primary balance weight is attached to its respective web portion by means of electron-beam welding, the direction of the electron-beam being transverse to the general plane of the web portion.
Claim 6
Dependent Claim
33 words
The method according to claim 3 including the steps of providing, on the primary and secondary balance weights respectively, complementary accommodation for means for attaching the trimmer plates to the primary balance weights.
Claim 7
Dependent Claim
25 words
The method according to claim 4, wherein the said accommodation is provided prior to attachment of the primary balance weights to their respective web portions.
Claim 8
Dependent Claim
28 words
The method according to claim 2, wherein the trimmer plates are attached to the primary balance weights subsequent to subjecting parts of the body to surface hardening treatment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |