CN116464590A - Push rod for a fuel pump drive of an internal combustion engine - Google Patents
Push rod for a fuel pump drive of an internal combustion engine Download PDFInfo
- Publication number
- CN116464590A CN116464590A CN202310048857.XA CN202310048857A CN116464590A CN 116464590 A CN116464590 A CN 116464590A CN 202310048857 A CN202310048857 A CN 202310048857A CN 116464590 A CN116464590 A CN 116464590A
- Authority
- CN
- China
- Prior art keywords
- pin
- opening
- main body
- push rod
- side edge
- 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.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 7
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- 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
- F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
- F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
-
- 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
- F02M59/48—Assembling; Disassembling; Replacing
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
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
A push rod for a fuel pump drive of an internal combustion engine is proposed, comprising a hollow cylindrical main body, which has a cam starting roller at its drive-side edge and a bridge for at least indirectly supporting a pump piston below the cam starting roller, the cam starting roller being supported on a pin, the pin having a middle part and two end regions which are reduced in diameter in contrast to this, the main body having two flats which are reduced in diameter from its outer side at the drive-side edge, the flats having in each case one opening therein, the end regions of the pin being located in the flats, the pin bearing the cam starting roller axially against the inner side of the flats via an annular shoulder between its end regions and the middle part and on the middle part, the flats of the main body starting directly from the drive-side edge of the main body, the openings in the flats being closed in the shape of a circle and having a diameter which is greater than the diameter of the middle part of the pin, the axis of the pin being closer to the driven-side edge of the main body than the axis of the openings.
Description
Technical Field
The invention relates to a tappet for a fuel pump drive of an internal combustion engine, comprising a hollow cylindrical main body, which has a cam starting roller in its drive side edge and a bridge for at least indirectly supporting a pump piston, as seen below the cam starting roller toward the driven side edge of the main body, wherein the cam starting roller is supported on a pin, which has a middle part and two end regions which are reduced in diameter in contrast to this, wherein the main body has two flats which are reduced in diameter from its outer side in the drive side edge, which have in each case one opening in which an end region of the pin is located, which axially stops on the inner side of the flats via an annular shoulder between its end region and the middle part and which carries the cam starting roller on the middle part.
The invention further relates to a method for installing a push rod.
Background
A conventional push rod is known from DE 10 2012 202 568 A1. The pin of the push rod for supporting the cam starting roller is stepped, wherein the pin extends via its reduced-diameter end region into a half-shell-shaped opening of the flat part of the base body. The drive side edge of the base body is formed as a closed circumferential ring. In order to hold the pin, the fingers placed radially inwards from the encircling ring extend from the half-shell-like opening of the flat, seen in the axial direction of the push rod.
Another push rod is known from fig. 3 of DE 10 2006 054 406 B4. In order to fix the push rod in an axially positive manner, the outer end thereof is widened by means of radial punctiform rivets. The widening of the pin ends in this case is clearly evident from fig. 1. The fixing is carried out such that the pin is present with a small axial play relative to the base body. Alternatively, the pins may also extend in the base via a close fit.
Disclosure of Invention
The aim is to achieve a push rod with an optimized and cost-effective pin fixture.
According to the invention, the object is achieved by: the flat part of the base body starts directly from its drive side edge, wherein the opening in the flat part is closed in a circular shape and has a diameter which is larger than the diameter of the middle part of the pin, and wherein the axis of the pin is offset from the axis of the opening, seen in the longitudinal direction of the push rod, such that the axis of the pin is closer to the driven side edge of the base body than the axis of the opening.
Since at least one manufacturing step for achieving pin fixation via outer end side deformation or the like of the pin is eliminated, the cost is significantly reduced in a large lot.
In the case of a base body made of steel sheet, the opening having at least one diameter allowing the pin to be guided through with extremely little force can be simply punched. In order to hold the pin in the housing after the engagement process of the pin, no further steps are required, such as pressing, twisting of its end sides or bending of a holding tongue or similar projection thereon. The last-mentioned retaining tongue/projection may also cause damage to the outer side of the pin.
According to a particularly preferred development of the invention, it is proposed that a clearance fit be present in the engagement region between the opening in the flat and the middle part of the pin. A slight transition fit is also possible here. It is decisive that no damage occurs in the event of lateral penetration of the pin, in particular of the raceway of the pin in the middle part for the cam starting roller, which preferably runs on the pin via a needle bearing or a slide bearing. What is sought is a large angle of closure of the opening around the end region of the pin in the final position of the pin, and engagement to the pin with low pressure. Likewise, the gap in the engagement area should be kept as small as possible in order to prevent the pin from being laterally dislodged from the opening during operation or during the above-described transportation of the push rod after manufacture is completed. The pins may also be individually secured during transport. In any case, it should be ensured that in operation, a micro-movement of the pin with the cam activation roller in the axial direction of the push rod does not cause the pin to lose its lateral abutment via its annular shoulder at the inner side of the flat, which can be set via the height of the annular shoulder.
In a further development of the invention, it is proposed that the fully hardenable pin be allowed to stretch in the base body without further deformations or other fastening means (snap rings, etc.) at its end regions/outer ends.
Furthermore, a method for mounting a push rod, more precisely a pin for mounting the push rod, is proposed. In one step, the pin should therefore be guided laterally to the outer side of the base body and pushed with little force into the opening of the base body (one end region facing forward). In a subsequent step, after reaching the centered engagement position of the pin in the base body, the pin is placed via its end region on the underside of the opening. The last-mentioned measure can be achieved simply by removing the joining tool under the influence of gravity. It is decisive that the two annular shoulders at the pin are in front of the inner side of the flat. No other positioning is required.
The measure according to the invention can also be used in the case of valve actuation levers, such as a drag lever or a rocker lever.
Drawings
Regarding the drawings:
fig. 1 shows a longitudinal section of a push rod for a fuel pump drive, with the "threading" shown for the pin.
Fig. 2 shows a longitudinal section as described above, together with the pin that completes the installation.
Fig. 3 shows the push rod as described above in a spatial view.
Detailed Description
From the figures, a tappet 1 for a fuel pump drive of an internal combustion engine is known. The push rod 1 has a substantially hollow-cylindrical base body 3 which has a cam starting roller 15 at its drive side edge 19 and, below the cam starting roller, as seen toward its driven side edge 21, has a separate bridge 22 for supporting a pump piston.
The cam starting roller 15 is supported on the middle portion 13 of the two-stage pin 9 via a needle bearing 28. At the pin 9, two end regions 11, which are diametrically reduced opposite the intermediate portion, are connected to both ends of the intermediate portion 13. At the same time, the base body 3 has two flat portions 5, which are retracted from the outer side 2 thereof, at the drive-side edge 19 and which have in each case one annular opening 7. The flat 5 extends axially to approximately more than half the base height and starts directly from the drive-side edge 19. The pin 9 is located in the opening 7 of the flat 5 via its reduced end region 11. An annular shoulder 30 of the pin 9 between the end region 11 and the intermediate portion 13 runs in front of the inner side 17 of the flat 5.
The opening 7 in the flat 5 has a diameter slightly larger than the diameter of the intermediate portion 13 of the pin 9. The diameter of the opening 7 and the diameter of the intermediate portion 13 are here matched such that there is a clearance fit between the opening and the intermediate portion.
The mounting of the pin 9 takes place by pushing the pin laterally and with a small force into the opening 7, as is clear from fig. 1. After reaching the centered engagement position of the pin in the base body 3, also after the intermediate portion 13 of the pin has completely passed through one of the openings 7 (see fig. 1, the left opening 7), the pin 9 is placed via its end region 11 on the underside 6 of the opening 7. The axis of the opening is marked in fig. 2 in order to illustrate the misalignment of the pin 9 with respect to the lowering of the opening 7. The axis of the pin 9 is here lower than the axis of the opening 7.
The holding of the pin 9 in the base body 3 takes place without further measures such as pressing at the outer end of its end region 11.
List of reference numerals
1. Push rod
3. Matrix body
5. Flat part
6. Underside of the lower part
7. An opening
9. Pin
11. End region
13. Middle part
15. Cam starting roller
17. Inside of the inner side
19. Drive side edge
20. Outer side surface
21. Driven side edge
22. Bridge-like element
28. Needle roller bearing
30. Annular shoulder
32. Underside of the lower part
33. Outer end
Claims (4)
1. A push rod (1) for a fuel pump drive of an internal combustion engine, having a hollow-cylindrical main body (3), the main body (3) having a cam starting roller (15) at its drive side edge (19) and, seen below the cam starting roller toward a driven side edge (21) of the main body, having a bridge (22) for at least indirectly supporting a pump piston, wherein the cam starting roller (15) is supported on a pin (9), which has a central portion (13) and two end regions (11) which are diametrically reduced relative thereto, wherein the main body (3) has at the drive side edge (19) two flats (5) which are reduced from the outer side face (2) of the main body, which flats have in each one opening (7) in which an end region (11) of the pin (9) is situated, the pin (9) bearing axially on the flats (5) via an annular shoulder (30) between its end regions (11) and the central portion (13) and being characterized in that the cam starting roller (3) is directly carried on the main body (19) at the inner side edge (17), wherein the opening (7) in the flat part (5) is closed in a ring shape and has a diameter which is larger than the diameter of the intermediate part (13) of the pin (9), and wherein the axis of the pin (9) is offset from the axis of the opening (7) as seen in the longitudinal direction of the push rod (1) such that the axis of the pin (9) is closer to the driven side edge (21) of the base body (3) than the axis of the opening (7).
2. A push rod according to claim 1, characterized in that the diameter of the opening (7) of the base body (3) and the diameter of the intermediate portion (13) of the pin (9) are paired such that there is a clearance fit between the opening of the base body and the intermediate portion of the pin.
3. Push rod according to claim 1 or 2, characterized in that the pin (9) is held in the base body (3) without an end-side deformation of its end region (11).
4. A method for mounting a push rod (1) with the features of any one of claims 1 to 3, characterized in that the pin (9) is guided laterally at the outer side (20) of the base body (3) and pushed into the opening (7) of the base body (3) in one step and in that the pin is placed on the underside (6) of the opening (7) via the end region (11) of the pin after reaching its centered engagement position in the base body (3) in another step.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022101014.7 | 2022-01-18 | ||
| DE102022101014.7A DE102022101014A1 (en) | 2022-01-18 | 2022-01-18 | Plunger for a fuel pump drive of an internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116464590A true CN116464590A (en) | 2023-07-21 |
Family
ID=86990459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310048857.XA Pending CN116464590A (en) | 2022-01-18 | 2023-01-17 | Push rod for a fuel pump drive of an internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116464590A (en) |
| DE (1) | DE102022101014A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006054406B4 (en) | 2006-11-18 | 2016-09-15 | Schaeffler Technologies AG & Co. KG | Hubübertragungsbauteil and method for its preparation |
| DE102012202568B4 (en) | 2012-02-20 | 2021-12-23 | Schaeffler Technologies AG & Co. KG | Roller tappet with brackets for a stepped bolt |
-
2022
- 2022-01-18 DE DE102022101014.7A patent/DE102022101014A1/en active Pending
-
2023
- 2023-01-17 CN CN202310048857.XA patent/CN116464590A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022101014A1 (en) | 2023-07-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240320 Address after: 1st Floor, Building 2, No. 1 Antuo Road, Anting Town, Jiading District, Shanghai Applicant after: SCHAEFFLER HOLDING(CHINA) Co.,Ltd. Country or region after: China Address before: German Herzogenaurach Applicant before: SCHAEFFLER TECHNOLOGIES AG & CO.KG Country or region before: Germany |
|
| TA01 | Transfer of patent application right |