WO2018069134A1 - Poussoir à galet pour pompe à piston et pompe à piston - Google Patents

Poussoir à galet pour pompe à piston et pompe à piston Download PDF

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Publication number
WO2018069134A1
WO2018069134A1 PCT/EP2017/075320 EP2017075320W WO2018069134A1 WO 2018069134 A1 WO2018069134 A1 WO 2018069134A1 EP 2017075320 W EP2017075320 W EP 2017075320W WO 2018069134 A1 WO2018069134 A1 WO 2018069134A1
Authority
WO
WIPO (PCT)
Prior art keywords
bolt
plunger body
roller
roller tappet
pin
Prior art date
Application number
PCT/EP2017/075320
Other languages
German (de)
English (en)
Inventor
Daniel Keilbach
Benjamin Christian Martin
Markus Kunz
Benjamin Deschner
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 WO2018069134A1 publication Critical patent/WO2018069134A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston

Definitions

  • the invention relates to a roller tappet for a piston pump, in particular a high-pressure fuel pump, having the features of the preamble of claim 1.
  • the roller tappet serves to support a pump piston of the piston pump to a cam or eccentric drive shaft.
  • the invention relates to a
  • Piston pump in particular a high-pressure fuel pump for supplying an internal combustion engine with fuel, with such a roller tappet.
  • a roller tappet of the type mentioned above is an example of the
  • the known roller tappet comprises a plunger part, in which a roller is rotatably mounted about a rotation axis, so that it can roll on a cam of a drive shaft of a piston pump.
  • the roller is arranged in an inner region of the plunger part facing the drive shaft.
  • a bolt is inserted in the plunger part, the longitudinal axis of which runs perpendicular to the longitudinal axis of the roller plunger.
  • the plunger member has two diametrically opposed openings through which the bolt passes. By means of an applied snap ring, the bolt is secured against axial movement.
  • the roller can be mounted rotatably on the bolt directly or via a bearing bush.
  • the plunger part has a passage for a lubricant, which opens into a groove which is provided in a peripheral region of the plunger part adjacent to an end face of the roller pointing in the direction of its axis of rotation in the inner casing and in the direction the longitudinal axis of the roller tappet extends.
  • the lubricant reaching the inner region of the tappet part via the passage and the groove is therefore supplied via an axial bearing gap between the roller and the inner shell of the plunger part of the rotary bearing of the roller.
  • the present invention seeks to provide a roller tappet for a piston pump, in particular for a high-pressure fuel pump, which allows a modified, the bolt incorporating lubrication concept.
  • the lubrication in the region of a radial bearing gap between the roller and the bolt is to be improved in order to provide a roller tappet which is particularly robust.
  • roller tappet is specified with the features of claim 1.
  • Advantageous developments of the invention can be found in the dependent claims.
  • a piston pump is proposed with such a roller tappet.
  • the roller tappet proposed for a piston pump serves to support a liftable pump piston on a cam or eccentric of a drive shaft. It comprises a plunger body with a front-side recess, in which, forming an axial bearing gap, a roller rotatably mounted on a pin is partially received. In this case, a radial bearing gap is formed between the roller and the bolt. According to the invention, the bolt is rotatably connected to the plunger body.
  • the non-rotatable connection of the bolt with the plunger body prevents the bolt from rotating during operation of the piston pump with the roller.
  • the lubrication medium provided for lubricating the radial bearing gap can accordingly be guided via a lubricating path which extends at least in sections through the bolt.
  • the lubrication path can be guided via an inlet bore passing through the bolt in the axial direction and connected directly to the radial bearing gap via at least one branching additional inlet bore is.
  • the realization of such a lubrication concept presupposes that the angular position of the bolt is predetermined in order to enable the connection of the inlet bores formed in the bolt to a region guiding the lubricant.
  • This may be, for example, an axial bearing gap which is formed between the plunger body and the roller.
  • the plunger body can have at least one radial bore, via which the inlet bores formed in the bolt can be supplied with the lubricating medium.
  • the bolt has at its two end faces in each case an approach, via which it is non-positively and / or positively connected to the plunger body.
  • at least one positive connection is achieved in order to secure the bolt against rotation about its own longitudinal axis and / or against rotation about the longitudinal axis of the plunger body.
  • the latter can be achieved, for example, in that the frontal projections of the bolt engage in recesses of the plunger body.
  • the bolt is additionally supported by the projections on the plunger body, in a direction parallel to the longitudinal axis of the plunger body. If a positive connection between the bolt and the tappet body is also achieved via the lugs, the bolt is held captive in the tappet body. This is particularly advantageous when the bolt is inserted from the open end side of the plunger body forth in this.
  • the end-side projections of the bolt each have at least two parallel side edges. These allow insertion of the bolt from the open end side of the plunger body ago.
  • the parallel side edges are therefore preferably aligned parallel to the longitudinal axis of the plunger body.
  • About the parallel side edges of the bolt can also support in the direction of rotation of the plunger body, so that it is secured against rotation about its own longitudinal axis.
  • the frontal projections of the bolt are inserted in recesses of the plunger body, which engage in the frontal recess of the plunger body. opposite to each other.
  • the lugs cause a form fit, which secures the bolt at least against rotation about the longitudinal axis of the plunger body.
  • the further recesses of the plunger body which are opposite the end-side recess are preferably open toward the end face of the plunger body. In this case, the bolt can be inserted from below into the plunger body.
  • the bolt In order to keep the bolt - at least during assembly - captive in the ram body, it is proposed that it is pressed into the plunger body.
  • the press fit can be effected via the end-side lugs of the bolt, which have a press excess with respect to a recess of the plunger body.
  • the limited by the two parallel side edges of a region of an end-face projection of the bolt have a pressing oversize relative to the approach receiving recess in the plunger body.
  • the axial extent of the bolt, including the end-side lugs can be equipped with a press oversize.
  • the position of the bolt in the plunger body is secured by at least one pin.
  • the pin is preferably guided perpendicular to the longitudinal axis of the plunger body and parallel to the longitudinal axis of the bolt, so that the position of the bolt is secured in the direction of the longitudinal axis of the plunger body.
  • the at least one pin can be used to secure the position of the bolt in a radial bore of the plunger body, preferably pressed, and engage in an axial bore of the bolt.
  • the pin is then inserted after mounting the bolt.
  • two individual pins are provided, both of which are inserted from the outside diametrically opposed radial bores of the plunger body, so that they engage with get the axial bore of the bolt.
  • a single pin is received in an axial bore of the bolt and the bolt has projecting end portions which engage in radial bores of the plunger body.
  • the pin is made in several parts and has two pin parts and an intermediate spring for radial bias of the pin parts relative to the plunger body.
  • the multi-part executed pin can be used before the mounting of the bolt in the axial bore of the bolt.
  • the two pin parts can be compressed against the spring force of the spring, so that are completely absorbed in the bolt. If the bolt has reached its end position, the end portions of the two pin parts are pressed by the spring force of the spring into the respective radial bore of the tappet body.
  • a position securing the bolt is provided by means of at least one pin, preferably the pin receiving the axial bore in the bolt on a small game to prevent over-determination in conjunction with a support of the bolt on the two end-side lugs on the plunger body. Because during operation of a piston pump, in which the roller tappet is used, the bolt is pressed over the cam lift in the region of the two lugs against the plunger body. In order for the force to be dissipated via the plunger body and not via the pin, the axial bore receiving the pin is to be provided with clearance.
  • an inlet bore passes through the bolt in the axial direction and is in communication with at least one radial bore of the tappet body serving as an inlet, so that the at least one inlet bore formed in the bolt can be acted upon by a lubricant via the radial bore of the tappet body.
  • a piston pump in particular a high-pressure fuel pump for supplying fuel to an internal combustion engine, which comprises a liftable pump piston, which has an inventive Roller tappet is supported on a cam or eccentric of a drive shaft.
  • the plunger body of the roller tappet is received in a cylinder bore of a housing part of the piston pump liftable.
  • roller tappet according to the invention in conjunction with the novel lubricating concept, can reduce the wear in the region of the engine of the pump, so that the service life of the pump increases.
  • the cylinder bore of the housing part, in which the roller tappet is received liftable connected to an engine-internal pressure oil supply line.
  • the pressure oil can be used as a lubricating medium.
  • the pressure prevailing in the pressure oil supply line supports the required lubrication.
  • Fig. 1 is a schematic longitudinal section through an inventive
  • FIG. 3 is a schematic side view of the bolt of the roller tappet of FIG. 1 and FIG. 4 is a schematic longitudinal section through the pin of the roller tappet of FIG.
  • FIG. 1 is a piston pump according to the invention with a roller tappet 1 for
  • roller tappet 1 Supporting a liftable pump piston 2 can be seen on a cam 3 of a rotating drive shaft 4.
  • the rotation of the drive shaft 4 is converted via the roller tappet 1 into a stroke movement of the pump piston 2.
  • the roller tappet 1 comprises one in a cylinder bore 26 of a housing part 27 the plunger pump liftably received plunger body 5 and an outer circumferentially on the cam 3 running off roller 9, which is rotatably mounted on a pin 8 for this purpose.
  • the plunger body 5 on the outer circumference side an annular groove 21 and two longitudinal grooves 18, which the
  • Ring groove 21 connect with the radial bores 25. Since the supply of the lubricating medium also leads via an axial bearing gap 7, at the same time the frontal contact area of the roller 9 is lubricated with the plunger body 5.
  • the illustrated lubrication concept presupposes a bolt 8 which is connected in a rotationally fixed manner to the tappet body 5.
  • the bolt 8 at its end faces 11 lugs 12 which engage in recesses 14 of the plunger body 5, which are diametrically opposed to a front-side recess 6 for receiving the roller 9.
  • the lugs 12 each have two parallel side edges 13, so that the bolt 8 including the roller 9 can be inserted from below into the frontal recess 6 of the tappet body 5.
  • the parallel side edges 13 thereby come to rest on the side walls of the front-side recess 6 of the plunger body 5 diametrically opposed recesses 14, so that hereby the bolt 8 is secured against rotation about its own longitudinal axis AB and about the longitudinal axis As of the plunger body 5 , About an arcuate extending further side edge 13 ', the bolt 8 is supported at the same time on the plunger body 5.
  • the frontal lugs 12 of the bolt 8 may have a pressing excess over the recesses 14 of the plunger body 5, so that the bolt 8 is held captive in the plunger body 5.
  • the press excess has the bolt 8 preferably between the two parallel side edges 13.
  • at least one pin 15 can be used to secure the position of the bolt 8. As shown by way of example in FIGS. 1 and 2, a multi-part design
  • Pin 15 may be used, which comprises a first pin part 15.1 and a second pin part 15.2 and a spring 22 (see also Fig. 4).
  • the multi-part executed pin 15 is inserted into an axial bore 17 of the bolt 8 prior to insertion or pressing of the bolt 8 in the plunger body 5. If now the bolt 8 is pushed from below into the front-side recess 6 of the tappet body 5, the two pin parts 15.1,

Landscapes

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

Abstract

L'invention concerne un poussoir à galet (1) pour une pompe à piston, en particulier une pompe à carburant haute pression, destiné à supporter un piston de pompe (2), mobile selon un mouvement alternatif, sur une came (3) ou un excentrique d'un arbre d'entraînement (4), ce poussoir comprenant un corps (5) présentant un évidement (6) frontal dans lequel un galet (9) monté rotatif sur un axe (8) est logé en partie de telle manière qu'un interstice de palier axial (7) est formé, un interstice de palier radial (10) étant formé entre le galet (9) et l'axe (8). Selon l'invention, l'axe (8) est relié solidaire en rotation au corps (5) du poussoir. L'invention concerne en outre une pompe à piston comprenant ce poussoir à galet (1).
PCT/EP2017/075320 2016-10-11 2017-10-05 Poussoir à galet pour pompe à piston et pompe à piston WO2018069134A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016219712.6A DE102016219712A1 (de) 2016-10-11 2016-10-11 Rollenstößel für eine Kolbenpumpe, Kolbenpumpe
DE102016219712.6 2016-10-11

Publications (1)

Publication Number Publication Date
WO2018069134A1 true WO2018069134A1 (fr) 2018-04-19

Family

ID=60022095

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/075320 WO2018069134A1 (fr) 2016-10-11 2017-10-05 Poussoir à galet pour pompe à piston et pompe à piston

Country Status (2)

Country Link
DE (1) DE102016219712A1 (fr)
WO (1) WO2018069134A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111622820A (zh) * 2020-06-22 2020-09-04 河南柴油机重工有限责任公司 一种柴油机滚轮挺柱

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19729793A1 (de) * 1997-07-11 1999-01-14 Bosch Gmbh Robert Kolbenpumpe zur Kraftstoffhochdruckversorgung
DE102012221604A1 (de) * 2012-11-27 2014-05-28 Robert Bosch Gmbh Rollenstößel für eine Pumpe, insbesondere Kraftstoffhochdruckpumpe, und Pumpe mit Rollenstößel
DE102012223413A1 (de) 2012-12-17 2014-06-18 Robert Bosch Gmbh Rollenstößel für eine Pumpe, insbesondere Kraftstoffhochdruckpumpe, und Pumpe mit Rollenstößel
DE102014207176A1 (de) * 2014-04-15 2015-10-29 Robert Bosch Gmbh Rollenstößel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19729793A1 (de) * 1997-07-11 1999-01-14 Bosch Gmbh Robert Kolbenpumpe zur Kraftstoffhochdruckversorgung
DE102012221604A1 (de) * 2012-11-27 2014-05-28 Robert Bosch Gmbh Rollenstößel für eine Pumpe, insbesondere Kraftstoffhochdruckpumpe, und Pumpe mit Rollenstößel
DE102012223413A1 (de) 2012-12-17 2014-06-18 Robert Bosch Gmbh Rollenstößel für eine Pumpe, insbesondere Kraftstoffhochdruckpumpe, und Pumpe mit Rollenstößel
DE102014207176A1 (de) * 2014-04-15 2015-10-29 Robert Bosch Gmbh Rollenstößel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111622820A (zh) * 2020-06-22 2020-09-04 河南柴油机重工有限责任公司 一种柴油机滚轮挺柱

Also Published As

Publication number Publication date
DE102016219712A1 (de) 2018-04-12

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