GB2560331A - Oil seal - Google Patents

Oil seal Download PDF

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Publication number
GB2560331A
GB2560331A GB1703628.6A GB201703628A GB2560331A GB 2560331 A GB2560331 A GB 2560331A GB 201703628 A GB201703628 A GB 201703628A GB 2560331 A GB2560331 A GB 2560331A
Authority
GB
United Kingdom
Prior art keywords
seal
camshaft
journal
lip
oil seal
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.)
Withdrawn
Application number
GB1703628.6A
Other versions
GB201703628D0 (en
Inventor
Hennig Christian
Wood Christopher
Pai Udai
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.)
Delphi International Operations Luxembourg SARL
Original Assignee
Delphi International Operations Luxembourg SARL
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 Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Priority to GB1703628.6A priority Critical patent/GB2560331A/en
Publication of GB201703628D0 publication Critical patent/GB201703628D0/en
Publication of GB2560331A publication Critical patent/GB2560331A/en
Withdrawn legal-status Critical Current

Links

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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
    • 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
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/08—Cylinder or housing parameters
    • F04B2201/0803—Leakage

Landscapes

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

Abstract

A fuel pump oil seal 22 arranged between the body 16 and journal 28 of a camshaft. The seal comprises a rubber body, an annular sealing lip 42 on the interior face 38, in sliding contact with the journal, and an annular protective lip 44 on the distal end of the interior face 38F. The protective lip defines a clearance C to the journal. The protective lip may be integral to the body. The protective lip prevents debris (such as dust) from damaging the sealing lip and opening leakage paths through which engine oil may contaminate diesel fuel on the other side. A fuel pump with a camshaft extending through an aperture in a peripheral wall of the pump using such an oil seal is also disclosed.

Description

(54) Title of the Invention: Oil seal
Abstract Title: Oil seal with protective lip (57) A fuel pump oil seal 22 arranged between the body 16 and journal 28 of a camshaft. The seal comprises a rubber body, an annular sealing lip 42 on the interior face 38, in sliding contact with the journal, and an annular protective lip 44 on the distal end of the interior face 38F. The protective lip defines a clearance C to the journal. The protective lip may be integral to the body.
The protective lip prevents debris (such as dust) from damaging the sealing lip and opening leakage paths through which engine oil may contaminate diesel fuel on the other side.
A fuel pump with a camshaft extending through an aperture in a peripheral wall of the pump using such an oil seal is also disclosed.
Figure GB2560331A_D0001
/2
Figure GB2560331A_D0002
FIG. 2 as
C
36E
2/2
Figure GB2560331A_D0003
FIG. 3
Figure GB2560331A_D0004
FIG. 4
OIL SEAL
TECHNICAL FIELD
The present invention relates to a seal member arranged between a fuel pump body wall and a rotating driveshaft.
BACKGROUND OF THE INVENTION
A diesel fuel injection equipment of an internal combustion engine comprises a high pressure pump wherein a driveshaft imparts reciprocating displacements to a piston, the pump inside being lubricated by diesel fuel. Driving means, such as a drive chain, Oldham coupling or gears connected to a taper portion of said driveshaft extending outside the pump, drive said driveshaft in rotation and are lubricated by engine oil. A seal member provided with a sealing lip sliding against a journal of the driveshaft protects the pump. Said engine oil carries debris and contamination may damage the sealing lip and the seal opening early leak path through which engine oil may leak in the pump and contaminate the diesel fuel.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to resolve the above mentioned problems in providing an oil seal adapted to be arranged between a fuel pump body wall and a journal of a camshaft extending therethrough about a main axis, said seal comprising a rubber body having an inner strip axially extending from a front end to a back end and defining an external side face provided by the front end with an annular sealing lip adapted to be in sliding contact against the camshaft journal, and wherein said seal further comprises an annular protective lip arranged beyond the sealing lip and extending from the front end of the inner strip to a distant end defining, in use, a clearance to the journal.
Said clearance is comprised between 50pm and 100pm to the diameter. Also, said protective lip is integral to the rubber body.
The invention further extends to a fuel pump having a camshaft extending through an aperture provided in a peripheral wall of the pump and, an oil seal as previously described and adapted to seal said aperture.
Said fuel pump has driving means driving said camshaft in rotation is, in use, lubricated by engine oil.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which:
Figure 1 is an axial section of a portion of a fuel pump especially focusing on a seal arranged between a pump wall and a driveshaft.
Figure 2 is a magnified portion of figure 1, focusing on said seal.
Figure 3 is a section of said seal represented in 3D.
Figure 4 is a magnified portion of figure 3 focusing on a sealing lip and a protective lip of the seal.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Diesel engines with direct fuel injection equipment drive a high pressure pump 10 to compress, typically to 2000 bars, and deliver fuel to a common rail reservoir wherefrom it is distributed to injectors spraying said fuel in the cylinders of the engine.
The HP pump 10 comprises a pumping head fixed onto a cambox 12 wherein a camshaft 14 cooperates with a piston to cyclically vary the volume of a fuel compression chamber. The camshaft 14 rotates about a main axis X between aligned bearings arranged in the walls 16 of the cambox, a tapered end portion 18 of said camshaft 14 extending outside the cambox and being adapted to receive driving means such as gears, chain or Oldham coupling transferring rotational move from the engine to said camshaft 12. While engine oil lubricates said driving, diesel fuel at low pressure lubricates inside the cambox.
Diesel fuel and engine oil must not mix and, a fuel seal 20 and an oil seal 22 positioned back-to-back are arranged in an aperture 24 of the cambox walls 16 around the camshaft 14 assure the necessary fuel-oil segregation. The fuel seal 20 arranged toward the inside of the cambox 12 is in contact with diesel fuel and, the oil seal 22 arranged toward the outside is in contact with the engine oil that lubricates the driving means.
More in details in reference to the figures, the aperture 24 has a cylindrical outer face 26 extending about said main axis X and, through said aperture 24 the camshaft 14 coaxially extends defining a cylindrical journal 28. In the annular space between said journal 28 and said outer face 26 is arranged the oil seal 22 that comprises a rubber body 30, a metallic armature 32 and a spring ring 34.
The rubber body 30 defines a cylindrical outer strip 36, an cylindrical inner strip 38, both strops 36, 38 joining via a transverse strip 40, previously referred as the “back” of the oil seal 22.
The outer strip axially 36 axially extends between a front end 36F, shown on the right of figure 2, and an opposed back end 36B, and it defines between said ends 36F, 36B an internal side face 361 opposed to an external side face 36E that is in surface contact against said aperture outer face 26.
Similarly, the cylindrical inner strip 38 axially X extends between a front end 38F, shown on the right of figure 2, and an opposed back end 38B, and it defines between said ends 38F, 38B and an internal side face 381, facing the outer strip internal side face 361, opposed to an external side face 38E provided by the front end 38F with an annular sealing lip 42 adapted to contact and slide against the journal face 28 of the camshaft. Also, a protective lip 44 forming a thin annular membrane integral to the rubber body 30 extends slightly inwardly beyond the inner strip front end 38F toward a distant end 46 that defines with the journal 28 an annular clearance C comprised between 50pm and 100pm. Said protective lip 44 aims at protecting the sealing lip 42 creating a barrier preventing particles present in the engine oil to approach the sealing lip 42.
The transverse strip 40, or back strip, extending from and joining said back ends 36B, 38B of said strips 36, 38, defines between said ends an internal side face 401, in continuity to the internal faces 361, 381 opposed to an external face 40E in continuity to the external faces 36 E, 38E.
The metallic armature 32 providing the necessary rigidity to the rubber body 30 comprises several individual F-shape members regularly arranged, a branch against internal side face 361 outer strip and, the other branch against the internal face 401 if the transverse strip.
The spring 34 is a closed resilient annulus of circular cross-section arranged in an complementary groove provided on the internal face 381 of the inner strip, right opposite the sealing lip 42, said spring 34 creating a radial force inwardly oriented that urges the sealing lip 42 in contact to the journal 28.
LIST OF REFERENCES
X c main axis clearance
10 high pressure (HP) pump
12 cambox
14 camshaft - driveshaft
16 walls of the cambox
18 tapered end portion of the camshaft
20 fuel seal
22 oil seal
24 aperture
26 outer face of the aperture
28 journal
30 rubber body
32 armature
34 spring
36 outer strip
36F front end of the outer strip
36B back end of the outer strip
361 internal side face of the outer strip
36E external side face of the outer strip
38 inner strip
38F front end of the inner strip
38B back end of the inner strip
381 internal side face of the inner strip
38E external side face of the inner strip
40 transverse strip - back of the oil seal
401 internal face of the transverse strip
40E external face of the transverse strip
42 sealing lip
44 protective lip
46 distant end of the protective lip

Claims (5)

  1. CLAIMS:
    1. Oil seal (22) adapted to be arranged between a fuel pump body wall (16) and a journal (28) of a camshaft (14) extending therethrough about a main axis
    5 (X), said seal (22) comprising a rubber body (30) having an inner strip (38) axially extending from a front end (38F) to a back end (38B) and defining an external side face (38E) provided by the front end with an annular sealing lip (42) adapted to be in sliding contact against the camshaft journal (28), and wherein said seal (22) further comprises an annular protective lip (44) arranged beyond the sealing
    10 lip (42) and extending from the front end (38F) of the inner strip to a distant end (46) defining, in use, a clearance (C) to the journal (28).
  2. 2. Oil seal (22) as claimed in the preceding claim wherein said clearance (C) is comprised between 50pm and lOOpm to the diameter.
  3. 3. Oil seal (22) as claimed in any of the preceding claims wherein said protective lip (44) is integral to the rubber body (30).
  4. 4. Fuel pump (10) having a camshaft (14) extending through an aperture
    20 (24) provided in a peripheral wall (16) of the pump and, an oil seal (22) as claimed in any one of the preceding claims adapted to seal said aperture (24).
  5. 5. Fuel pump (10) as claimed in claim 4 wherein driving means driving said camshaft (14) in rotation is, in use, lubricated by engine oil.
    Intellectual
    Property
    Office
    Application No: GB1703628.6 Examiner: Nicholas Wigley
GB1703628.6A 2017-03-07 2017-03-07 Oil seal Withdrawn GB2560331A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1703628.6A GB2560331A (en) 2017-03-07 2017-03-07 Oil seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1703628.6A GB2560331A (en) 2017-03-07 2017-03-07 Oil seal

Publications (2)

Publication Number Publication Date
GB201703628D0 GB201703628D0 (en) 2017-04-19
GB2560331A true GB2560331A (en) 2018-09-12

Family

ID=58543784

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1703628.6A Withdrawn GB2560331A (en) 2017-03-07 2017-03-07 Oil seal

Country Status (1)

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GB (1) GB2560331A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11173239A (en) * 1997-12-05 1999-06-29 Denso Corp Fuel injection pump
DE102011054592A1 (en) * 2011-10-19 2013-04-25 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Sealing device for fuel pump of motor vehicle, has annular sealing unit peripherally contacting drive shaft of fuel pump in sections, and liquid barrier that peripherally wets annular sealing unit completely during rotation of drive shaft
US20150219219A1 (en) * 2014-02-04 2015-08-06 Freudenberg-Nok General Partnership Energy Saving Self-Contact Seal With Pushing Bead
US20160116067A1 (en) * 2013-05-14 2016-04-28 Nok Corporation Sealing device
US20160201629A1 (en) * 2015-01-13 2016-07-14 Denso Corporation Fuel supply device
CN205618669U (en) * 2016-04-25 2016-10-05 广州加士特密封技术有限公司 Flexible oil blanket structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11173239A (en) * 1997-12-05 1999-06-29 Denso Corp Fuel injection pump
DE102011054592A1 (en) * 2011-10-19 2013-04-25 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Sealing device for fuel pump of motor vehicle, has annular sealing unit peripherally contacting drive shaft of fuel pump in sections, and liquid barrier that peripherally wets annular sealing unit completely during rotation of drive shaft
US20160116067A1 (en) * 2013-05-14 2016-04-28 Nok Corporation Sealing device
US20150219219A1 (en) * 2014-02-04 2015-08-06 Freudenberg-Nok General Partnership Energy Saving Self-Contact Seal With Pushing Bead
US20160201629A1 (en) * 2015-01-13 2016-07-14 Denso Corporation Fuel supply device
CN205618669U (en) * 2016-04-25 2016-10-05 广州加士特密封技术有限公司 Flexible oil blanket structure

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