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Pump unit for supplying fuel, preferably diesel oil, to internal combustion engine

A fuel supply and pump unit technology, which is applied to fuel injection pumps, components of pumping devices for elastic fluids, liquid fuel engines, etc. higher question

Inactive Publication Date: 2017-05-31
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The known pump units of the above-mentioned type have a number of disadvantages, mainly because the production cycle of the corresponding handpieces is relatively complex and expensive, since each handpiece comprises the structure of the corresponding supply pipe and the thread of the corresponding widening
[0011] Furthermore, the pump unit has a relatively high number of parts and a relatively long assembly time due to the presence of the closed plugs in each head, while at the same time, due to the presence of the pipes for supplying fuel to the cylinders, the The overall dimensions and overall weight of the nosepiece are relatively high

Method used

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  • Pump unit for supplying fuel, preferably diesel oil, to internal combustion engine

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Embodiment Construction

[0015] Referring to the drawings, reference numeral 1 designates the entire pump unit for supplying fuel, preferably diesel, to an internal combustion engine (not shown).

[0016] The pump unit 1 includes a high-pressure pump (piston pump 2 in this example) for supplying fuel to the aforementioned internal combustion engine (not shown), and a pre-supply pump (in this example) for supplying fuel to the pump 2. In the example a gear pump3).

[0017] In the present invention, the pump 2 includes a pump body 4, the pump body 4 is provided with a central hole 5, and the central hole 5 has a longitudinal axis 6; the pump body 4 is also provided with a plurality of lateral holes 7 (in this invention In the example two lateral holes 7 ) have respective longitudinal axes 8 , which are parallel to each other and perpendicular to the axis 6 , and which face the hole 5 .

[0018] Inside each hole 7 is arranged a tubular die 9 fixed to the pump body 4 , protruding into the hole 7 and exte...

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Abstract

A pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine has at least two cylinders (10), which are formed in at least one head (9), are slidingly engaged by respective pistons (13), and communicate hydraulically with respective fuel inlets (11) in the cylinders (10) via respective interposed intake valves (15) provided with respective valve bodies (16) incorporated in the head (9); the inlets (11) of all the cylinders (10) being closed by a single cover (33) fixed to the head (9).

Description

technical field [0001] The invention relates to a pump unit for supplying fuel, preferably diesel, to an internal combustion engine. [0002] In particular, the invention relates to a pump unit of the type comprising a high-pressure pump for supplying fuel to the internal combustion engine and a pre-supply pump for supplying fuel to the high-pressure pump. Background technique [0003] In general, a high-pressure pump comprises a pump body with a central bore and at least two lateral bores with respective longitudinal axes which are parallel to each other and perpendicular to the longitudinal direction of the central bore. axis and toward the center hole. [0004] Inside each lateral hole is placed a tubular nose comprising a constriction constituting the cylinder of the high-pressure pump and a widening connected on an annular shoulder to the constriction. [0005] Fuel is supplied into the cylinder through an intake valve comprising a valve body mounted in the widened p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/06F02M59/10F04B1/04F02M59/46F02M59/48F04B53/00F04B53/16
CPCF02M59/06F02M59/102F02M59/464F02M59/48F04B1/04F04B1/0421F04B23/103F04B53/007F04B53/16F02M59/027F02M59/105F04B1/063F04B53/168
Inventor V·米农诺A·德卢卡
Owner ROBERT BOSCH GMBH