US3836296A - Oil seal for use in a rotary piston internal combustion engine - Google Patents

Oil seal for use in a rotary piston internal combustion engine Download PDF

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Publication number
US3836296A
US3836296A US00241939A US24193972A US3836296A US 3836296 A US3836296 A US 3836296A US 00241939 A US00241939 A US 00241939A US 24193972 A US24193972 A US 24193972A US 3836296 A US3836296 A US 3836296A
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US
United States
Prior art keywords
oil seal
face
groove
inside wall
internal combustion
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.)
Expired - Lifetime
Application number
US00241939A
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English (en)
Inventor
H Sakamaki
H Ozeki
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.)
Nippon Piston Ring Co Ltd
Original Assignee
Nippon Piston Ring Co Ltd
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 Nippon Piston Ring Co Ltd filed Critical Nippon Piston Ring Co Ltd
Application granted granted Critical
Publication of US3836296A publication Critical patent/US3836296A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C19/00—Sealing arrangements in rotary-piston machines or engines
    • F01C19/08—Axially-movable sealings for working fluids
    • 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
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member

Definitions

  • the oil seal has an annular groove provided on the annular sliding face which is formed into a lip face having a lip angle a to an adjacent inside wall face of a side housing of the engine and which includes a contacting face formed on the radial inner peripheral side thereof and disposed in frictional contact with the inside wall face in such a position that the distance between both the radial inner peripheral faces of the groove and the oil seal is within the maximum width of a contacting face which may perform the normal operation of the oil seal.
  • the lubrieating oil is caused to flow through or along elements of the engine by various means such as a pump, and this oil is, as a matter of course, caused to flow between the rotor side face and the inside wall face. Therefore, the function required for the oil seal is to prevent the leakage of the oil into the combustion chamber in order to prevent an increase of the lubricating oil consumption and the accumulation of carbon slag during operation of the engine, and to form a proper lubricating oil film on the inside wall face of the side housing to facilitate the easy sliding of the oil seal. For this purpose, as shown in FIG.
  • an annular sliding face 6a of a conventional oil seal 6 is formed into a lip face having a lip angle a to the adjacent inside wall face since the oil seal rotates about its central axis while said axis is revolving about the longitudinal axis of the engine, at any given time one side of said seal 6 is moving downwardly with respect to wall 2 while a diametrically opposite portion is moving upwardly, with reference to FIG. 3.
  • seal 6 moves downwardly with respect to the wall 2
  • it scrapes oil form the wall face 21.
  • it moves upwardly, it floats on the oil on the wall surface due to the angle a.
  • This alternately scraping/floating action combined with the planetary motion of the seal serves to force oil toward the central axis of the engine. This is commonly referred to as the oil take in action.
  • the present invention contemplates the elimination of the aforesaid disadvantages of the conventional oil seal of a rotary piston internal combustion engine and provides an improved oil seal with a simple structure which has an improved sealing function between the rotor side face and the adjacent inside wall face of the side housing.
  • an oil seal for a rotary piston internal combustion engine which oil seal has an annular groove provided on the sliding face thereof in such a position that the distance between the radial inner peripheral faces of the groove and the oil seal is equal to or less than the radial dimension of the contact area between seal 6 and wall surface 21 which allows excessive oil consumption.
  • FIG. 1 is a vertical longitudinal sectional view of a prior art rotary piston internal combustion engine
  • FIG. 2 is a longitudinal sectional view taken along the line II-II in FIG. 1;
  • FIG. 3 is a partially enlarged longitudinal sectional view of a prior art rotary piston internal combustion engine using a conventional oil seal
  • FIGS. 4A and 4B are enlarged longitudinal sectional views of the oil seal according to the present invention.
  • FIG. 5 is a front view of the oil seal shown in FIG. 4A.
  • FIG. 6 is a partially enlarged longitudinal sectional view of the rotary piston internal combustion engine using the oil seal according to the present invention wherein the contacting face of the oil seal has reached its maximum extent.
  • Reference numeral 1 illustrates the center housing of a conventional rotary piston internal combustion engine
  • 2 is a side housing
  • 3 is an eccentric shaft bridged between the side housings 2,2
  • 4 is a rotor supported by the eccentric shaft 3 in such a manner that the rotor 4 is eccentrically rotated while sliding within the inside wall faces of the center housing and the side housing
  • 5 represents an annular oil seal groove recessed on the thrust face of the rotor 4
  • 6 is an oil seal mounted in the oil seal groove 5
  • the oil seal 6 includes an O-ring 8 and a spring 7 provided at the axial inner face of the oil seal 6 so as to urge the oil seal 6 onto the adjacent inside wall face 21 of the side housing.
  • the oil seal of the present invention has an annular groove 63 provided on an annular sliding face 61 which is formed into a lip face 61a having a lip angle a to the adjacent inside wall face 21 in such a position that the distance between both the radial inner peripheral faces of the groove 63 and the oil seal is within the maximum width of a contacting face A which may perform normal operation of the oil seal in the engine.
  • the maximum width of the contacting face A is 0.8 mm from the inner peripheral face 62 of the oil seal; accordingly the annular groove 63 is provided at or near the limit of 0.8 mm from the inner peripheral face 62. Further, it is more preferable when some contacting width C is initially provided on the lip face 61a as shown in FIG. 43.
  • the oil pressure P represented by the arrow mark for leaking the oil outward of the oil seal 60 is decreased under the action of the annular groove 63 when the contacting face A is progressively worn and reaches the maximum width as shown in FIG. 6, that is, when the contacting width between the contacting face A and the adjacent inside wall face 21 becomes 0.8 mm in such an automobile operation as mentioned above, so that the leakage of the oil is remarkably prevented, and moreover since the oil is always existing in the groove 63, the lip face 61a is remarkably protected from the frictional wear itself.
  • the oil tightness of the oil seal is sufficiently maintained so as to prevent an increase in the lubricating oil consumption and accumulation of the carbon slag.
  • the sectional forms of the annular groove 63 may be any of rectangular, semi-circular, triangular, etc., a rectangular shape is most preferable.
  • the width B of the groove is preferably 0.1 mm to 0.55 mm, the depth h is approximately 3 times the width B.
  • the oil seal of the present invention is a simple structure, it may be used for maintaining the proper oil seal action for a long time.
  • an oil seal for use with a rotary piston internal combustion engine, said oil seal including an annular sliding face on an axial out side thereof formed into a lip face disposed at a lip angle a to an adjacent inside wall face of a side housing of the engine with the radial inner peripheral side of the sliding face constituting an annular contacting face disposed in frictional sliding contact with said inside wall face, the improvement comprising an annular groove in said sliding surface of said oil seal in such a position that only at least a portion of the area between the radially inner peripheries of the groove and oil seal contact the inside wall face of the side housing, the distance between the radially inner peripheral faces of the groove and the oil seal is no larger than 0.8 mm, the width of the groove is be tween 0.1 mm and 0.55 mm and the depth of the groove is 3 times the groove width.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US00241939A 1971-04-08 1972-04-07 Oil seal for use in a rotary piston internal combustion engine Expired - Lifetime US3836296A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971025835U JPS5246961Y2 (enrdf_load_stackoverflow) 1971-04-08 1971-04-08

Publications (1)

Publication Number Publication Date
US3836296A true US3836296A (en) 1974-09-17

Family

ID=12176903

Family Applications (1)

Application Number Title Priority Date Filing Date
US00241939A Expired - Lifetime US3836296A (en) 1971-04-08 1972-04-07 Oil seal for use in a rotary piston internal combustion engine

Country Status (5)

Country Link
US (1) US3836296A (enrdf_load_stackoverflow)
JP (1) JPS5246961Y2 (enrdf_load_stackoverflow)
DE (1) DE2217064A1 (enrdf_load_stackoverflow)
FR (1) FR2133430A5 (enrdf_load_stackoverflow)
GB (1) GB1392661A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909015A (en) * 1973-07-12 1975-09-30 Nissan Motor Ring seal assembly for a rotary piston internal combustion engine
US3998572A (en) * 1974-11-29 1976-12-21 Sealed Power Corporation Spacer-spring for rotary piston engines
US10954790B2 (en) 2016-08-02 2021-03-23 Eagle Industry Co., Ltd. Stepped sealing device circumferential pumping groove
US20220216763A1 (en) * 2021-01-05 2022-07-07 Fairway Electronic Co., Ltd. Rotating Machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5172451U (enrdf_load_stackoverflow) * 1974-12-02 1976-06-08
JPS5479238U (enrdf_load_stackoverflow) * 1977-11-15 1979-06-05
DE3643780A1 (de) * 1986-12-20 1988-06-23 Mai Wolfgang Dipl Ing Fh Luft- oder gemischverdichtende einfach-kreiskolben-brennkraftmaschine in trochoiden-bauart

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2062367A (en) * 1934-12-03 1936-12-01 Ramsey Accessories Mfg Corp Piston ring
US3179331A (en) * 1963-02-27 1965-04-20 Nsu Motorenwerke Ag Annular side seal for rotors of rotary engines
US3193188A (en) * 1963-04-11 1965-07-06 Curtiss Wright Corp Rotor and seal construction for rotary mechanisms
GB1016540A (en) * 1963-12-07 1966-01-12 Daimler Benz Ag Improvements relating to axial seals for rotary-piston internal combustion engines
US3309011A (en) * 1965-09-22 1967-03-14 Toyo Kogyo Company Ltd Seal construction for rotary combustion engine
US3400939A (en) * 1966-01-03 1968-09-10 Curtiss Wright Corp Oil seal construction for rotary engines
DE1803533A1 (de) * 1968-10-17 1970-05-27 Daimler Benz Ag Rotationskolben-Brennkraftmaschine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2062367A (en) * 1934-12-03 1936-12-01 Ramsey Accessories Mfg Corp Piston ring
US3179331A (en) * 1963-02-27 1965-04-20 Nsu Motorenwerke Ag Annular side seal for rotors of rotary engines
US3193188A (en) * 1963-04-11 1965-07-06 Curtiss Wright Corp Rotor and seal construction for rotary mechanisms
GB1016540A (en) * 1963-12-07 1966-01-12 Daimler Benz Ag Improvements relating to axial seals for rotary-piston internal combustion engines
US3309011A (en) * 1965-09-22 1967-03-14 Toyo Kogyo Company Ltd Seal construction for rotary combustion engine
US3400939A (en) * 1966-01-03 1968-09-10 Curtiss Wright Corp Oil seal construction for rotary engines
DE1803533A1 (de) * 1968-10-17 1970-05-27 Daimler Benz Ag Rotationskolben-Brennkraftmaschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909015A (en) * 1973-07-12 1975-09-30 Nissan Motor Ring seal assembly for a rotary piston internal combustion engine
US3998572A (en) * 1974-11-29 1976-12-21 Sealed Power Corporation Spacer-spring for rotary piston engines
US10954790B2 (en) 2016-08-02 2021-03-23 Eagle Industry Co., Ltd. Stepped sealing device circumferential pumping groove
US20220216763A1 (en) * 2021-01-05 2022-07-07 Fairway Electronic Co., Ltd. Rotating Machine

Also Published As

Publication number Publication date
GB1392661A (en) 1975-04-30
JPS4723505U (enrdf_load_stackoverflow) 1972-11-16
FR2133430A5 (enrdf_load_stackoverflow) 1972-11-24
DE2217064A1 (de) 1972-11-09
JPS5246961Y2 (enrdf_load_stackoverflow) 1977-10-25

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