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US4629127A Expired / Lapsed US ⏱️ 0.0 years remaining

Intermittent swirl type injection valve

Assignee: Toyota Central R&D Labs Inc
•
Filing: 1984-09-05
•
Granted: 1986-12-16
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Expires: 2004-09-05
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Abstract

Abstract An intermittent swirl type injection valve having a spray angle, capacity coefficient and fuel spray travel distance set so that the valve produces optimum engine operating conditions, with the spray angle, capacity coefficient and fuel spray travel distances being determined taking into account the gap area A c , the spray hole diameter d e , and the area A g of tangential passages in the valve. The injection valve includes a valve body and a valve needle slidably fitted in a valve hole formed in the valve body. A spray hole in the valve body merges with a valve seat provided at an end of the valve hole, and the spray hole is shaped to receive the lower end of the valve needle. Tangential passages swirl the fuel when the needle valve leaves the valve seat to open the valve to spray fuel substantially conically through the spray hole. The injection valve is designed so as to satisfy the following conditions: α=20° to 75°, d.sub.e =0.3 to 1.2 mm, and ##EQU1## where α is the spray angle of the fuel and θ is the angle between the central axis of the tangential passages and the central axis of the valve needle.

Inventors

  • 👤 Kiyomi Kawamura
  • 👤 Akinori Saito
  • 👤 Masatoshi Yamada
  • 👤 Kenji Imai
  • 👤 Masanobu Kimura

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 00:15
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/04; F02M61/10; F02M61/16; F02M61/162; F02M61/18; F02B; F02B2275/00; F02B2275/14; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 179 words
An intermittent swirl type injection valve comprising: a valve body; a valve needle slidably fitted in a valve hole in said valve body; a spray hole in said valve body merging with a valve seat provided at an end of said valve hole, said spray hole being shaped to receive a lower end of said valve needle; and tangential passages provided for swirling fuel when said valve needle leaves said valve seat to open said injection valve to spray fuel substantially conically through said spray hole, wherein said injection valve satisfied the following conditions: α=20° to 75°, d.sub.e =0.3 to 1.2 mm, and ##EQU13## where α is the spray angle of fuel, d e is the diameter of said spray hole, A g is the area of the tangential passages, A c is the area of a gap provided between a wall of said valve hole and a cylindrical surface of said valve needle for supplying fuel therethrough, and θ is the angle between a central axis of each tangential passage and a central axis of said valve needle.
Claim 2
Dependent Claim 179 words
An intermittent swirl type injection valve comprising: a valve body; a valve needle slidably fitted in a valve hole in said valve body; a spray hole in said valve body merging with a valve seat provided at an end of said valve hole, said spray hole being shaped to receive a lower end of said valve needle; and tangential passages provided for swirling fuel when said valve needle leaves said valve seat to open said injection valve to spray fuel substantially conically through said spray hole, wherein said injection valve satisfied the following conditions: α=20° to 75°, d.sub.e =0.3 to 1.2 mm, and ##EQU13## where α is the spray angle of fuel, d e is the diameter of said spray hole, A g is the area of the tangential passages, A c is the area of a gap provided between a wall of said valve hole and a cylindrical surface of said valve needle for supplying fuel therethrough, and θ is the angle between a central axis of each tangential passage and a central axis of said valve needle.
Claim 3
Dependent Claim 27 words
The intermittent swirl type injection valve as claimed in claim 1, wherein said injection valve satisfies the following conditions: ##EQU14## for α=45°, and d e =0.6 mm.
Claim 4
Dependent Claim 35 words
The intermittent swirl type injection valve as claimed in claim 1, wherein for d e =0.4 to 1.0 mm and α=20° to 70°, the following conditions are satisfied: ##EQU15## for 0.9 mm<d e ≦1.0 mm.
Claim 5
Dependent Claim 30 words
The intermittent swirl type injection valve as claimed in claim 3, wherein, for α=40° to 50°, the following conditions are satisfied: ##EQU16## and in addition to the above range, ##EQU17##
Claim 6
Dependent Claim 21 words
The intermittent swirl type injection valve as claimed in claim 1, wherein said tangential passages are provided in said valve body.
Claim 7
Dependent Claim 21 words
The intermittent swirl type injection valve as claimed in claim 1, wherein said tangential passages are provided in said valve needle.
Claim 8
Dependent Claim 38 words
The intermittent swirl type injection valve as claimed in claim 1, further comprising a partition member inserted between an inner wall of said valve body and said valve needle, said tangential passages being provided in said partition member.

References Cited (Backward Citations)

US1252254A Cited
FR1197303A Cited
US4060199A Cited
US4179069A Cited
US4365746A Cited
US4526143A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1989-12-15 1990-06-16 1990-12-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1993-12-15 1994-06-16 1994-12-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1997-12-15 1998-06-16 1998-12-16 $7700.00 Window Closed / Lapsed

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