GB2144182A - Fuel injection pump for internal - combustion engines - Google Patents

Fuel injection pump for internal - combustion engines Download PDF

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Publication number
GB2144182A
GB2144182A GB08412293A GB8412293A GB2144182A GB 2144182 A GB2144182 A GB 2144182A GB 08412293 A GB08412293 A GB 08412293A GB 8412293 A GB8412293 A GB 8412293A GB 2144182 A GB2144182 A GB 2144182A
Authority
GB
United Kingdom
Prior art keywords
pump
damping
injection pump
annular disc
compression spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08412293A
Other versions
GB8412293D0 (en
GB2144182B (en
Inventor
Helmut Laufer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB8412293D0 publication Critical patent/GB8412293D0/en
Publication of GB2144182A publication Critical patent/GB2144182A/en
Application granted granted Critical
Publication of GB2144182B publication Critical patent/GB2144182B/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/12—Attachments or mountings
    • F16F1/126—Attachments or mountings comprising an element between the end coil of the spring and the support proper, e.g. an elastomeric annulus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/121—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor with piston arranged axially to driving shaft

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A fuel injection pump includes a compression spring (24) for returning the pump piston (18), the spring being arranged between a yoke (23) carried by the piston and a collar (26) of a pin (27) which guides the yoke. An annular disc (32) made of elastic material, such as polyamide, silicone rubber or acrylonitrile butadiene rubber, is inserted between the pump body (25) and the collar (26) of the guide pin (27). The annular disc (32) damps the natural vibrations of the helical compression spring (24). As a result of the damping, the helical compression spring (24) is less likely to break. <IMAGE>

Description

SPECIFICATION Fuel injection pump for internal-combustion engines The invention relates to a fuel injection pump for internal-combustion engines according to the precharacterising clause of Claim 1. A pump of this type is known from German Offenlegungsschrift 2,923,423, and in this the damping member is a doubie-sided spring plate which is loaded by two spring haives and the sleeve-shaped centre portion of which is axially displaceable on a pin of the housing. The displacements generate coordinated frictional forces which cause the necessary damping of the two spring halves.
Although the known damping member can be built into the fuel injection pump subsequently without changing other parts of the latter, nevertheless it is necessary for this purpose to have several individual elements and to coordinate them carefully with one another, in order to ensure that the frictional forces remain constant and therefore that damping takes place over the entire operating time of the pump.
By means of the invention, the problem presented in the abovementioned state of the art is solved by simple means and in a reliable way over the entire operating time of the pump. In contrast to the abovedescribed damping caused by friction, the damping according to the invention is caused by means of the elastic material of the thrust piece.
Advantageous developments of the invention are described in the sub-claims. Of the plurality of damping materials available, three which have a particularly favourable damping effect on the compression spring are proposed in the design of the fuel injection pump according to Claims 2,3 and 4. In the so-called distributor injection pump for internalcombustion engines, the spring plate of the pump piston is guided on at least two pins each inserted in a blind hole of the housing and having a collar which presses the compression spring at least indirectly against the supporting surface of the housing. Claim 5 indicates for a distributor injection pump of this type a technically particularly simple method of damping the natural vibrations of the compression spring.Claims 6 and 7 show possibilities for the better deflection of the annular-disc material which is displaced during damping.
An exemplary embodiment of the invention is illustrated in the drawing and explained in more detail in the following description of the Figures.
Figure 1 shows in segments a fuel distributor injection pump for internal-combustion engines in a diagonai section and in natural size, and Figure 2 shows a cut-out in the region of an annular disc acting as a damping member, in a radial section and in an enlarged representation.
A fuel distributor injection pump for internalcombustion engines in Figure 1 has a housing 11 and a drive shaft 12 which is mounted in the latter and which is coupled to an end cam disc 13 having as many cams 14 as the internal-combustion engine has cyiinders. The running track of the cam disc 13 interacts with rollers 15 which are mounted on bolts 16 of a bearing ring 17. A pump piston 18 has, on its end portion located on the same side as the drive, a flange 19 which is coupled to the end cam disc 13 by an engagement means 20.
Ayoke 23 ofthe pump piston 18 rests on the flange 19, with two sliding washers 21 being interposed, and two axis-parallel diametrically arranged helical compression springs 24 press against this yoke and come up against a supporting surface 22 of a pump body 25 of the housing 11 in a way yet to be described.
The injection pump operates as follows: When the internal-combustion engine is running, the drive shaft 12 and consequently the end cam disc 13 rotate. At the same time, the latter is pressed constantly against the rollers 15 by means of the force of the helical compression springs 24, which exerts a restoring force on the pump piston 18, so that, because the cams 14 roll on the rollers 15, a rotary and lifting movement of the pump piston 18 takes place and consequently fuel is conveyed in a known way. Two guide pins 27 are guided in a blind hole 28 in the pump body 25 and each have a collar 26. One end portion of the helical compression spring 24 presses a spring plate 31 and a compensating washer 30 against one side of the collar 26, and the other end portion is supported on the part of the yoke 23 designed as a spring plate.
An annular disc 32 made of elastic material acts as a damping member and is inserted between the other side of the collar 26 and the supporting surface 22 of the pump body 25. The following elastic materials have proved particularly useful for the annular disc 32 polyamide, silicone rubber and acrylonitrile/butadiene rubber (NBR rubber).
Figure 2 shows a first modified embodiment of the annular disc 32' and a second embodiment of the annular disc 32", each in a half-sided view. In all the embodiments of the annular disc 32 32,32', 32", its through-hole 33 has sufficient play in relation to the guide pin 27. The annular disc 32 has an annular groove 34 in each of the two plane-parallel bearing surfaces 35, and the annular disc 32" has an annular groove 34' in the wall of the through-hole 33.
The three embodiments of the annular disc 32,32', 32" are shown when the helical compression spring 24 is merely prestressed. When the annular discs act as a damping member in the predetermined way, they assume the form shown by broken lines, in which their elastic material is deflected transversely to the axis 36 of the guide pin 27 (indicated by broken lines).
1. Fuel injection pump for internal-combustion engines, with at least one compression spring which rests against a supporting surface of the housing of the pump and a supporting surface of a pump piston and which exerts a restoring force on the latter, and with a damping member to prevent the compression spring from breaking, characterised in that the damping member (32,32', 32") is a thrust piece made of elastic material, which is located between
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Fuel injection pump for internal-combustion engines The invention relates to a fuel injection pump for internal-combustion engines according to the precharacterising clause of Claim 1. A pump of this type is known from German Offenlegungsschrift 2,923,423, and in this the damping member is a doubie-sided spring plate which is loaded by two spring haives and the sleeve-shaped centre portion of which is axially displaceable on a pin of the housing. The displacements generate coordinated frictional forces which cause the necessary damping of the two spring halves. Although the known damping member can be built into the fuel injection pump subsequently without changing other parts of the latter, nevertheless it is necessary for this purpose to have several individual elements and to coordinate them carefully with one another, in order to ensure that the frictional forces remain constant and therefore that damping takes place over the entire operating time of the pump. By means of the invention, the problem presented in the abovementioned state of the art is solved by simple means and in a reliable way over the entire operating time of the pump. In contrast to the abovedescribed damping caused by friction, the damping according to the invention is caused by means of the elastic material of the thrust piece. Advantageous developments of the invention are described in the sub-claims. Of the plurality of damping materials available, three which have a particularly favourable damping effect on the compression spring are proposed in the design of the fuel injection pump according to Claims 2,3 and 4. In the so-called distributor injection pump for internalcombustion engines, the spring plate of the pump piston is guided on at least two pins each inserted in a blind hole of the housing and having a collar which presses the compression spring at least indirectly against the supporting surface of the housing. Claim 5 indicates for a distributor injection pump of this type a technically particularly simple method of damping the natural vibrations of the compression spring.Claims 6 and 7 show possibilities for the better deflection of the annular-disc material which is displaced during damping. An exemplary embodiment of the invention is illustrated in the drawing and explained in more detail in the following description of the Figures. Figure 1 shows in segments a fuel distributor injection pump for internal-combustion engines in a diagonai section and in natural size, and Figure 2 shows a cut-out in the region of an annular disc acting as a damping member, in a radial section and in an enlarged representation. A fuel distributor injection pump for internalcombustion engines in Figure 1 has a housing 11 and a drive shaft 12 which is mounted in the latter and which is coupled to an end cam disc 13 having as many cams 14 as the internal-combustion engine has cyiinders. The running track of the cam disc 13 interacts with rollers 15 which are mounted on bolts 16 of a bearing ring 17. A pump piston 18 has, on its end portion located on the same side as the drive, a flange 19 which is coupled to the end cam disc 13 by an engagement means 20. Ayoke 23 ofthe pump piston 18 rests on the flange 19, with two sliding washers 21 being interposed, and two axis-parallel diametrically arranged helical compression springs 24 press against this yoke and come up against a supporting surface 22 of a pump body 25 of the housing 11 in a way yet to be described. The injection pump operates as follows: When the internal-combustion engine is running, the drive shaft 12 and consequently the end cam disc 13 rotate. At the same time, the latter is pressed constantly against the rollers 15 by means of the force of the helical compression springs 24, which exerts a restoring force on the pump piston 18, so that, because the cams 14 roll on the rollers 15, a rotary and lifting movement of the pump piston 18 takes place and consequently fuel is conveyed in a known way. Two guide pins 27 are guided in a blind hole 28 in the pump body 25 and each have a collar 26. One end portion of the helical compression spring 24 presses a spring plate 31 and a compensating washer 30 against one side of the collar 26, and the other end portion is supported on the part of the yoke 23 designed as a spring plate. An annular disc 32 made of elastic material acts as a damping member and is inserted between the other side of the collar 26 and the supporting surface 22 of the pump body 25. The following elastic materials have proved particularly useful for the annular disc 32 polyamide, silicone rubber and acrylonitrile/butadiene rubber (NBR rubber). Figure 2 shows a first modified embodiment of the annular disc 32' and a second embodiment of the annular disc 32", each in a half-sided view. In all the embodiments of the annular disc 32 32,32', 32", its through-hole 33 has sufficient play in relation to the guide pin 27. The annular disc 32 has an annular groove 34 in each of the two plane-parallel bearing surfaces 35, and the annular disc 32" has an annular groove 34' in the wall of the through-hole 33. The three embodiments of the annular disc 32,32', 32" are shown when the helical compression spring 24 is merely prestressed. When the annular discs act as a damping member in the predetermined way, they assume the form shown by broken lines, in which their elastic material is deflected transversely to the axis 36 of the guide pin 27 (indicated by broken lines). CLAIMS
1. Fuel injection pump for internal-combustion engines, with at least one compression spring which rests against a supporting surface of the housing of the pump and a supporting surface of a pump piston and which exerts a restoring force on the latter, and with a damping member to prevent the compression spring from breaking, characterised in that the damping member (32,32', 32") is a thrust piece made of elastic material, which is located between the compression spring (24) and at least one of the supporting surfaces (22).
2. Pump according to claim 1, characterised in that the thrust piece (32,32', 32") consists of a thermoplastic, especially polyamide.
3. Pump according to Claim 1, characterised in that the thrust piece (32,32', 32") consists of silicone rubber.
4. Pump according to Claim 1, characterised in that the thrust piece (32,32', 32") consists of acrylonitrile butadiene rubber (MBR rubber).
5. Pump according to one of Claims 2 to 4, with several pins inserted in the housing and intended for guiding the spring plate, characterised in that each pin (27) has a collar (26) acting as a supporting surface for the spring, and in that the thrust piece (32,32', 32") has the form of an annular disc which is inserted between the collar (26) and the supporting surface (22) of the housing (11).
6. Pump according to Claim 5, characterised in that the annular disc (32') has a first and a second bearing surface (35), and in that an annular groove (34) is recessed in the first and/or the second bearing surface
7. Pump according to Claim 5 or 6, characterised in that an annular groove (34') is recessed in the wall of the through-hole (33) of the annular disc (32").
8. Afuel injection pump substantially as herein described with reference to the accompanying drawing.
GB08412293A 1983-07-13 1984-05-14 Fuel injection pump for internal - combustion engines Expired GB2144182B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833325196 DE3325196A1 (en) 1983-07-13 1983-07-13 FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES

Publications (3)

Publication Number Publication Date
GB8412293D0 GB8412293D0 (en) 1984-06-20
GB2144182A true GB2144182A (en) 1985-02-27
GB2144182B GB2144182B (en) 1987-02-25

Family

ID=6203823

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08412293A Expired GB2144182B (en) 1983-07-13 1984-05-14 Fuel injection pump for internal - combustion engines

Country Status (3)

Country Link
JP (1) JPS6036769A (en)
DE (1) DE3325196A1 (en)
GB (1) GB2144182B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572466A1 (en) * 1984-10-27 1986-05-02 Bosch Gmbh Robert Fuel injection pump for IC engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB527468A (en) * 1939-04-13 1940-10-09 Morris Motors Ltd Improvements relating to spring mountings for motor vehicles
GB992582A (en) * 1960-10-26 1965-05-19 Gomma Antivibranti Applic Helical spring suspension for vehicles
GB1044113A (en) * 1964-01-17 1966-09-28 Metallurg De Saint Urbain Atel Helical spring
US4148469A (en) * 1978-01-23 1979-04-10 Standard Car Truck Company Dual rate spring with elastic spring coupling
EP0046436A1 (en) * 1980-08-19 1982-02-24 SOCIETE M T E Société anonyme Elastic element comprising a helicoidal spring

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1156606B (en) * 1961-10-13 1963-10-31 Bosch Gmbh Robert Fuel injection pump for multi-cylinder internal combustion engines, especially for light fuel
DE2142704C3 (en) * 1971-08-26 1974-04-25 Robert Bosch Gmbh, 7000 Stuttgart Fuel injection pump for multi-cylinder internal combustion engines
DE2923423A1 (en) * 1979-06-09 1980-12-11 Bosch Gmbh Robert Fuel injection pump for IC engine - has two return springs in series, with spring plate between, to prevent resonant vibration of springs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB527468A (en) * 1939-04-13 1940-10-09 Morris Motors Ltd Improvements relating to spring mountings for motor vehicles
GB992582A (en) * 1960-10-26 1965-05-19 Gomma Antivibranti Applic Helical spring suspension for vehicles
GB1044113A (en) * 1964-01-17 1966-09-28 Metallurg De Saint Urbain Atel Helical spring
US4148469A (en) * 1978-01-23 1979-04-10 Standard Car Truck Company Dual rate spring with elastic spring coupling
EP0046436A1 (en) * 1980-08-19 1982-02-24 SOCIETE M T E Société anonyme Elastic element comprising a helicoidal spring

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572466A1 (en) * 1984-10-27 1986-05-02 Bosch Gmbh Robert Fuel injection pump for IC engine

Also Published As

Publication number Publication date
GB8412293D0 (en) 1984-06-20
DE3325196A1 (en) 1985-01-24
JPS6036769A (en) 1985-02-25
JPH0380981B2 (en) 1991-12-26
GB2144182B (en) 1987-02-25

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930514