US3773440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection pump construction
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1971-12-22
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Granted: 1973-11-20
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Expires: 1991-12-22
Abstract
Abstract A fuel injection pump includes a fuel pump plunger which is movable to direct the fuel under pressure through a passage which is regulated by a delivery valve. The delivery valve includes a collar portion which, upon the return movement of the delivery valve, causes a sucking back (or unloading) action on the fuel in a direction toward the pump plunger chamber. The invention provides means for varying the fuel flow area in the return direction of movement of the delivery valve in accordance with the lift of the delivery valve during its operative opening movement. In one arrangement the delivery valve is constructed to close one or more escape ports during its downward return movement for slowing the return flow of the fuel to the plunger chamber and in another embodiment the delivery valve includes an end portion which provides a variable throttling action on a port communicating with the delivery valve passage and the pump plunger chamber.
Inventors
- 👤 M Tateishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:16
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F02; F02M; F02M59/00; F02M59/44; F02M59/46; F02M59/462
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
318 words
A fuel injection pump, comprising a body defining a plunger chamber with a discharge end, a valve delivery passage having one end connected into the discharge end of said plunger chamber and having an opposite delivery chamber end, said body defining a delivery chamber connected to said delivery chamber end of said delivery passage, a delivery valve having a stem portion movable in said delivery passage and a valve head portion with an intermediate collar of substantially the same diameter as the diameter of said delivery passage and being movable toward and away from the delivery chamber end of the passage, plunger movable in said plunger chamber to move said fluid therein through said valve delivery passage and into said delivery chamber and to move said valve portion away from the delivery chamber end of said passage, said valve head portion and said collar being movable with said stem portion in an opposite return direction toward said plunger chamber, and flow control means associated with said delivery valve for controlling the descending velocity of said delivery valve and for varying the flow area from said valve delivery passage to said plunger chamber end ahead of said valve stem portion in the return movement thereof in accordance with the lift of said delivery valve during the operational stroke of said plunger, said flow area being less than the area of said collar, said means associated with said delivery valve for varying the flow area from said valve delivery passages to said plunger chamber includes a tapered valve member connected to said stem portion, said delivery passage having a narrowed section adjacent the connection thereof to said plunger chamber, said tapered valve member having a pointed needle end being shiftable and being of smaller diameter than said passage and with said valve into said passage for increase throttling of the flow area during the return movement of said delivery valve.
Claim 2
Dependent Claim
318 words
A fuel injection pump, comprising a body defining a plunger chamber with a discharge end, a valve delivery passage having one end connected into the discharge end of said plunger chamber and having an opposite delivery chamber end, said body defining a delivery chamber connected to said delivery chamber end of said delivery passage, a delivery valve having a stem portion movable in said delivery passage and a valve head portion with an intermediate collar of substantially the same diameter as the diameter of said delivery passage and being movable toward and away from the delivery chamber end of the passage, plunger movable in said plunger chamber to move said fluid therein through said valve delivery passage and into said delivery chamber and to move said valve portion away from the delivery chamber end of said passage, said valve head portion and said collar being movable with said stem portion in an opposite return direction toward said plunger chamber, and flow control means associated with said delivery valve for controlling the descending velocity of said delivery valve and for varying the flow area from said valve delivery passage to said plunger chamber end ahead of said valve stem portion in the return movement thereof in accordance with the lift of said delivery valve during the operational stroke of said plunger, said flow area being less than the area of said collar, said means associated with said delivery valve for varying the flow area from said valve delivery passages to said plunger chamber includes a tapered valve member connected to said stem portion, said delivery passage having a narrowed section adjacent the connection thereof to said plunger chamber, said tapered valve member having a pointed needle end being shiftable and being of smaller diameter than said passage and with said valve into said passage for increase throttling of the flow area during the return movement of said delivery valve.
Claim 3
Dependent Claim
291 words
A fuel injeciton pump, comprising a body defining a plunger chamber with a discharge end, a valve delivery passage having one end connected into the discharge end of said plunger chamber and having an opposite delivery chamber end, said body defining a delivery chamber connected to said delivery chamber end of said delivery passage, a delivery valve having a stem portion movable in said delivery passage and a valve head portion with an intermediate collar of substantially the same diameter as the diameter of said delivery passage and being movable toward and away from the delivery chamber end of the passage, a notched-type plunger movable in said plunger chamber to move fluid therein through said valve delivery passage and into said delivery chamber and to move said valve portion away from the delivery chamber end of said passage, said valve head portion and said collar being movable with said stem portion in an opposite return direction toward said plunger chamber, and flow control means associated with said delivery valve for controlling the descending velocity of said delivery valve and for varying the flow area from said valve delivery passage to said plunger chamber end ahead of said valve stem portion in the return movement thereof in accordance with the lift of said delivery valve during the operational stroke of said plunger, said flow area being less than the area of said collar, said body defining an intermediate throttle passage between said valve delivery passage and said plungEr chamber, said valve stem portion including a throttle member movable through said passage for varying the flow area of said passage, said stem portion including a pointed needle end movable through said throttle passage and having a diameter slightly smaller than said throttle passage.
Claim 4
Dependent Claim
291 words
A fuel injeciton pump, comprising a body defining a plunger chamber with a discharge end, a valve delivery passage having one end connected into the discharge end of said plunger chamber and having an opposite delivery chamber end, said body defining a delivery chamber connected to said delivery chamber end of said delivery passage, a delivery valve having a stem portion movable in said delivery passage and a valve head portion with an intermediate collar of substantially the same diameter as the diameter of said delivery passage and being movable toward and away from the delivery chamber end of the passage, a notched-type plunger movable in said plunger chamber to move fluid therein through said valve delivery passage and into said delivery chamber and to move said valve portion away from the delivery chamber end of said passage, said valve head portion and said collar being movable with said stem portion in an opposite return direction toward said plunger chamber, and flow control means associated with said delivery valve for controlling the descending velocity of said delivery valve and for varying the flow area from said valve delivery passage to said plunger chamber end ahead of said valve stem portion in the return movement thereof in accordance with the lift of said delivery valve during the operational stroke of said plunger, said flow area being less than the area of said collar, said body defining an intermediate throttle passage between said valve delivery passage and said plungEr chamber, said valve stem portion including a throttle member movable through said passage for varying the flow area of said passage, said stem portion including a pointed needle end movable through said throttle passage and having a diameter slightly smaller than said throttle passage.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |