CN102597521B

CN102597521B - Pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine

Info

Publication number: CN102597521B
Application number: CN201080049784.7A
Authority: CN
Inventors: T·日曼; N·洛尤迪切; M·尤科内; W·施特克莱因
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2009-11-06
Filing date: 2010-10-12
Publication date: 2015-03-25
Anticipated expiration: 2030-10-12
Also published as: IN2012DN01494A; ITMI20091948A1; EP2496837B1; RU2012123138A; CN102597521A; RU2555097C2; WO2011054632A2; WO2011054632A3; EP2496837A2

Abstract

A pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine is provided with a check valve (9), which is positioned in the passage (3) for delivering the fuel to the internal combustion engine and which is provided with a plug (10) which is movable between a position in which it opens the delivery passage (3) and a position in which it closes the passage, a stop element (11) being fitted in the delivery passage (3) to form a seat (14) for receiving and retaining the plug (10) after the opening of the check valve (9).

Description

For diesel oil being preferably supplied to by fuel the pump unit of internal combustion engine

Technical field

The present invention relates to a kind of pump unit for fuel (preferably diesel oil) being supplied to internal combustion engine.

More specifically, the present invention relates to a kind of pump unit, it comprises pump case, for supplying fuel to the piston pump of internal combustion engine and the gear pump for supplying fuel to piston pump.

Background technology

Piston pump comprises: at least one cylinder body, be slidably engaged in piston in cylinder body, for enter for fuel passage in cylinder body, for by fuel area density to the transfer passage of internal combustion engine and be assemblied in transfer passage to prevent fuel return to the check-valves in cylinder body.

Usually, check-valves comprises: roughly ball-type connector, and it can close between a position of transfer passage and another position that wherein connector opens transfer passage and move by connector wherein; And spring, it is for moving into its closing position by connector and usually connector being remained on this closing position.

Because connector is only by spring-loaded, connector can move to its open position along path that is non-directional and that do not coincide with the longitudinal axis of transfer passage, from its closing position (wherein, connector engages the ring-type ball-type seat be formed in transfer passage in this closing position); Therefore, connector by radially displacement, and rotated by the fuel being undertaken supplying by transfer passage.

Therefore, connector, from its open position to the movement of its closing position, also occurs along the non-directional route do not coincided with the longitudinal axis of transfer passage; Further, the state that therefore connector remains in due to the hydraulic coupling applied by fuel and rotate, and the sidewall that against aforementioned cyclic ball-type seat radially moves.The centrifugal force produced by the rotation of connector is so huge under some operating conditions, to such an extent as to it postpones or even stops the correct closed of transfer passage.

Summary of the invention

Target of the present invention is to provide a kind of for fuel (preferably diesel oil) is supplied to unipump unit, and it does not have above-mentioned shortcoming and can simply and manufacture economically.

According to the present invention, as described in the appended claims, a kind of pump unit is provided for and fuel (preferably diesel oil) is supplied to internal combustion engine.

Accompanying drawing explanation

Below, the present invention is described with reference to the accompanying drawings, and accompanying drawing is longitudinal cross-section, and removes some parts in order to clearly cause, illustrated therein is non-limiting exemplary embodiment of the present invention.

Detailed description of the invention

With reference to accompanying drawing, Reference numeral 1 integrally shows the pump unit for fuel (preferred diesel oil) being supplied to internal combustion engine (not shown).

Pump unit 1 comprises in invention: pump case 2; Known piston pump (it is not shown) is for supplying fuel to foregoing internal combustion engine (not shown); And known gear pump (it is not shown) is for supplying fuel to piston pump (not shown).

Piston pump (not shown) comprises at least one cylinder body, and it can be engaged slidably by piston; Described piston can along cylinder body, move in the mode of linear reciprocating motion, and be combined with the passage entering cylinder body for fuel and with for the passage 3 of fuel area density to internal combustion engine (not shown) is combined.

Passage 3 has predetermined longitudinal axis 4, and comprises: the constriction 5 be connected with the cylinder body of piston pump (not shown); The amplifier section 6 be connected with internal combustion engine (not shown); And mid portion 7, it extends and forms the ring-type conical seat 8 roughly coaxial with longitudinal axis 4 between constriction 5 and amplifier section 6.

Conical seat 8 defines a part for check-valves 9, and described check-valves is contained in passage 3 with the cylinder body preventing fuel return from entering piston pump (not shown); This check-valves also comprises the connector 10 of roughly ball-type, described connector 10 can move between passage 3 is closed wherein a position and another position that wherein passage is opened, and being provided with stop part 11, it is installed in amplifier section 6 to stop the movement of connector 10 when its open position.

Stop part 11 is roughly bolt shape, and comprises: spiral is screwed into the head 12 in pump case 2, and tubular handle bar 13, and itself and longitudinal axis 4 extend in amplifier section 6 coaxially and its external diameter is less than the internal diameter of amplifier section 6.Free end towards connector 10 opening vertically of tubular handle bar 13, and form ring-type conical seat 14 for stopping the movement of connector 10 when its open position.

Tubular handle bar 13 and amplifier section 6 define the ring chamber 15 roughly coaxial with longitudinal axis 4 combinedly, and there is the inner passage 16 coaxial with longitudinal axis 4, described inner passage 16 comprises the amplifier section 17 towards connector 10 and the constriction 18 towards head 12.

Amplifier section 17 accommodates spring 19 therein, and described spring 19 is installed, for connector 10 being moved into its closing position and usually connector being remained on closing position coaxially with longitudinal axis 4; Meanwhile, amplifier section 17 is connected with ring chamber 15 by multiple hole 20, and this some holes 20 is issued around longitudinal axis 4 equably and is formed to be transverse to longitudinal axis 4 ground through handle bar 13; Further, constriction 18 is connected with the ring-type manifold 21 that longitudinal axis 4 is formed in pump case 2 coaxially by multiple hole 22, and described hole 22 is distributed in around longitudinal axis 4 equably, and is formed as running transverse through handle bar 13 relative to longitudinal axis 4.

Amplifier section 6 and handle bar 13 also combine in a fluid tight manner by inserting O-ring seal 23; When O-ring seal 23 is O type circle, O-ring seal is and longitudinal axis 4 is co-axially mounted on the intermediate point place between hole 20 and 22 of handle bar 13.

In use, connector 10 moves to by fuel (it is supplied along passage 3 by piston pump (not shown)) position that wherein connector opens passage 3, thus make fuel adjoining land flow through mid portion 7, along ring chamber 15, passing hole 20, along passage 16, passing hole 22 enter manifold 21.

Because the diameter of connector 10 and the internal diameter of amplifier section 17 optionally control as follows, namely make by the fuel be contained in passage 3 the power put on connector 10 be greater than by spring 19 put on power on connector 10 and by the fuel be contained in passage 16 put on the summation of the power on connector 10; And, due to fuel along ring chamber 15 and the supply of passing hole 20 cause the pressure drop in fuel thus cause creating in passage 16 and comparatively speaking comparatively low pressure in passage 3, so connector 10 as follows longitudinally axis 4, move along straight line path, namely connector 10 engages seat 14, and is roughly held in the whole delivery phase of piston pump (not shown) the possibility not having axis and/or move radially in seat 14.

At the end of delivery phase and during the sucting stage of piston pump (not shown), connector 10 as follows by spring 19 power and be contained in the fuel in passage 16 power effect, along the longitudinal axis 4 direction, move along roughly straight line path, namely connector 10 engages seat 8 and relatively closes passage 3 rapidly.

Due to existence and the shape of stop part 11 (and especially handle bar 13), therefore likely by connector 10 along the longitudinal axis 4 move to its open and close position along roughly straight line path, with the whole delivery phase at piston pump (not shown), connector 10 is held in seat 14, thus prevent the connector 10 in present 8 and seat 14 from carrying out radial direction and/or moving axially, to reduce the wearing and tearing on connector 10, seat 8 and seat 14 and spring 19, and reduce the closing time of connector 10, thus improve the efficiency of pump unit 1.

In unshowned first modification, eliminate spring 19, and connector 10 closes by means of only the power of the fuel be contained in passage 16.

In another modification unshowned, eliminate O-ring seal 23, and handle bar 13 manufactures as follows, namely handle bar 13 comprises: arrange porose 20 and its external diameter is less than the constricted end portion of the diameter of amplifier section 6, and the mid portion amplified, described mid portion extends and has the external diameter being substantially equal to amplifier section 6 diameter between hole 20 and 22, passing hole 20 is carried by fuel, to make the fuel in passage 16 that the pressure drop expected occur, and to prevent fuel from flowing directly into manifold 21 along ring chamber 15 simultaneously.

Claims

1. for supplying fuel to a pump unit for internal combustion engine, this pump unit comprises: pump case (2), be formed in pump case (2) for the transfer passage (3) that supplies fuel to internal combustion engine and the check-valves (9) be positioned in transfer passage (3); Described check-valves (9) comprising: connector (10), and it can be opened between a position of described transfer passage (3) and another position that described connector closes described transfer passage (3) wherein and move by described connector wherein; And First (8), it is formed in transfer passage (3) to accommodate connector (10) at connector (10) after open position moves to closing position;

It is characterized in that: described pump unit also comprises stop part (11), it to be assemblied in transfer passage (3) and to be provided with second (14), and described second (14) for receive and retain connector (10) at connector after closing position moves to open position;

Described stop part (11) comprises at least one tubular portion (13), described tubular portion there is the axially open free end that forms described second (14) and connector (10) be placed be in its open position time hydraulic connecting to transfer passage (3);

Described stop part (11) comprises for making at least one entering in tubular portion (13) of fuel enter aperture portion (20), and comprises at least one the outflow aperture portion (22) for making fuel flow out from tubular portion (13); And, by the fuel be contained in tubular portion (13) put on power on connector (10), by the mode making connector (10) be kept to be in its open position, to realize being less than by the fuel supplied by described First (8) put on power on connector (10); And

Described pump unit comprises sealing device (23) extraly, its to be positioned between transfer passage (3) and stop part (11) in case make fuel-turn flow through described in enter aperture portion (20).

2. pump unit according to claim 1, is characterized in that: pump unit comprises hydraulic circuit (6,7,15,20) extraly, for being undertaken supplying by First (8) and be fed in tubular portion (13) by fuel; Hydraulic circuit (6,7,15,20) is formed to make, and is the pressure lower than being put on by the fuel supplied by described First (8) on connector (10) by the fuel be contained in tubular portion (13) pressure put on connector (10).

3. pump unit according to claim 1, is characterized in that: tubular portion (13) has predetermined longitudinal axis (4), and the direction entering aperture portion (20) is roughly transverse to described longitudinal axis (4).

4. pump unit according to claim 3, it is characterized in that: tubular portion (13) at least comprises Part I, the external diameter of described Part I is less than the diameter of the corresponding part (6) of transfer passage (3), and enters aperture portion (20) described in being provided with.

5. pump unit according to claim 1, it is characterized in that: sealing device (23) comprises O-ring seal, it is installed between transfer passage (3) and stop part (11) and is installed on and enters between aperture portion (20) and outflow aperture portion (22).

6. pump unit according to claim 1, it is characterized in that: tubular portion (13) comprises Part II, described Part II is entering extension between aperture portion (20) and outflow aperture portion (22), and the external diameter that Part II has equals the diameter of the corresponding part (6) of transfer passage (3).

7. according to pump unit arbitrary in claim 1 to 6, it is characterized in that: check-valves (9) comprises spring (19) extraly, connector (10) pushes towards its closing position by described spring (19); Putting on the power on connector (10) by the fuel supplied by described First (8), is be greater than by spring (19) and the summation being put on the power on connector (10) by the fuel be contained in tubular portion (13).

8. according to pump unit arbitrary in aforementioned claim 1 to 6, it is characterized in that: stop part (11) is fixed in pump case (2).

9. pump unit according to claim 1, is characterized in that: described fuel is diesel oil.