US3895892A - Oil seal means of a rotary engine - Google Patents

Oil seal means of a rotary engine Download PDF

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Publication number
US3895892A
US3895892A US414216A US41421673A US3895892A US 3895892 A US3895892 A US 3895892A US 414216 A US414216 A US 414216A US 41421673 A US41421673 A US 41421673A US 3895892 A US3895892 A US 3895892A
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United States
Prior art keywords
oil seal
spring
seal means
rotor
base portion
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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
US414216A
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English (en)
Inventor
Yoshio Sasaki
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.)
Toyota Motor Corp
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Toyota Motor Corp
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Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
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Publication of US3895892A publication Critical patent/US3895892A/en
Anticipated expiration legal-status Critical
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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

Definitions

  • ABSTRACT An oil seal means of a rotary engine comprising a plu- [30] Foreign Application priority Data rality of oil seal rings disposed one over the other and mounted 1n a common annular o1l seal groove formed July 18, 1973 Japan 48-80284 at a s1de wall port1on of a rotor and sprmg means 52 US. Cl 418/142; 267/1.5 adapted reslenfly urge 1 Seal. anally outwardly of the rotor, wherem sa1d sprmg means 1n- [51] Int. Cl.
  • This invention relates to oil seal means of rotary engines, and more particularly an .oil seal means to be mounted at a side wall portion of a rotor to keep oil and FIG. 1, wherein a center housing 1 having an inside surface of a trochoidal cross-sectional configuration and side housings 2 closing opposite sides of the center housing define a chamber therein, in which is positioned a rotor 4 which is movable about an eccentric shaft 3 in a planetary manner.
  • annular oil seal means 7 is often constituted to have the structure such as exemplarily shown in FIG. 2, wherein a plurality of oil seal rings 9 and are mounted in a common annular oil seal groove 8, one over the other, for the purpose of increasing the oil and gas tightening effectiveness of the oil seal means.
  • a corrugated spring 11 such as exemplarily shown in FIG. 3 along the bottom wall of the annular oil seal groove 8 so as to urge the oil seal rings 9 and 10 outwardly of the annular oil seal groove 8 in the direction of the rotor axis so that the tip end portions of the oil seal rings are pressed against the wall surface of the side housing to maintain oil and gas tightness therebetween.
  • the corrugated spring 11 is formed to provide separate swelling portions 12 to abut against the bottom portions of the oil seal rings so that the oil seal rings 9 and 10 are allowed to move independently of each other.
  • the corrugated spring having the shown structure contains the drawback that if one of the swelling portions 12 falls down in operation due to a high temperature condition, said falling down of the swelling portion affects the swelling portion forming a pair therewith, which eventually causes the falling down of the second swelling portion. Furthermore, the falling down or failure of a pair of theswelling portions 12 affects adjecent pairs of the swelling portions 12, and in this manner the spring force which pushes against the oil seal rings is gradually lost, thus causing a deterioration in the oil and gas tightening performance of the oil seal means.
  • an oil seal means of a rotary engine comprising a plurality of oil seal rings disposed one over the other and mounted in a common annular oil seal groove formed at aside wall portion of a rotor and spring means adapted to resiliently urge each of said oi] seal rings each, independently and axially, outwardly of the rotor, characterized in that said spring means includes a substantially flat base portion adapted to seat upon the bottom wall of said annular oil seal groove and a plurality of spaced spring portions extending from opposite edges of said base portion an inclined with respect to said base portion, said spring portions each supporting only one of said plurality of oil seal rings.
  • each of said spring portions operates independently as a spring toapply its own spring force to either one of said oil seal rings without being directly affected by deformations or the falling down of other spring portions. Therefore, the oil seal ring supported by a plurality of such spring portions acting separately thereupon can be stably supported for a long period of operation.
  • said base portion may have a plan shape of a uniform strip formed with rectangular projections extending alternately at opposite sides thereof, said spring portion being an integral extension of said projection, the extended portion being turned in the opposite direction with respect to the corresponding projection, whereby a relatively long span of the spring of a cantilever type is available to improve the resiliency of the spring and thereby to attain a good followablity of the oil seal ring over the unavoidably convexed or concaved inside surface of the side housing.
  • FIG. 1 is a side view of an example of the rotary engine, showing the same with one of the side housings being removed for the purpose of illustration;
  • FIG. 2 is a sectional view showing an example of the conventional oil seal means provided at the side wall portion of the rotor;
  • FIG. 3 is a perspective view of the spring used in the oil seal means shown in FIG. 2;
  • FIGS. 4 and 5 are perspective views of two embodiments of the spring means used in the oil seal means according to this invention.
  • FIGS. 6 and 7 are cross-sectional views Corresponding to FIG. 2 showing embodiments of the oil seal means according to this invention constituted by employing the spring means as shown in FIGS. 4 and 5, respectively.
  • FIGS. 4 and 5 show in perspective view two embodiments of the spring means to be incorporated in the oil seal means according to this invention
  • FIGS. 6 and 7 show in cross-section corresponding to FIG. 2 the oil seal means of a rotary engine constituted by employing the spring means shown in FIGS. 4 and 5, respectively.
  • the spring means 13 shown in FIG/4 includes two portions separated by cuts 14 spaced lengthwise therealong (circumferential direction of the rotor) and extending over substantially the entire width thereof (radial direction of the rotor), one being a flat, belt-like base portion 15 and the other being spaced spring portions 16 each extending from said base portion and inclined with respect to said base portion.
  • the spring portions 16 are extended from the belt-like base portion 15 in the opposing directions as inclined, each being deformed at the tip end portion thereof to present an abutting face portion 17 inclined by an angle to conveniently abut against the bottom portion of the oil seal ring. It is apparent that the spring means 13 can easily be produced by a punching out process ofa sheet material.
  • Thespring means 18 has the substantially same structure as the spring means 13 shown in FIG. 4, and therefore, the portions corresponding to those shown in FIG. 4 are designated by the same reference numerals in FIG. 5. It will be apparent that the spring means 18 shown in FIG. 5 can also be easily produced by a substantially same punching out process as the spring means 13 shown in FIG. 4.
  • the heat conducting distance of the spring portion 16 is relatively short and the base portion 15 8 over a sufficiently large area, whereby the heat transmitted to the oil seal rings 9 and 10 is advantageously passed to the body of the rotor 4, eliminating the danger of the heat accumulating in the spring means to heat the same up to a high temperature. Therefore, in the structure according to this invention, it is not necessary that the spring means 13 and 18 are made of a very highly classed material regarding the high temperature characteristic thereof.
  • An oil seal means of a rotary engine comprising a plurality of oil seal rings disposed one over the other and mounted in a common annular oil seal groove formed at a side wall portion of a rotor, said annular oil seal groove containing a bottom wall and spring means adapted to resiliently urge each of said oil seal rings independently and axially outwardly of the rotor, characterized in that said spring means includes a substantially flat base portion to seat upon the bottom wall of said annular oil seal groove and a plurality of spaced spring portions extending from opposite edges'of said base portion and inclined with respect to said base portion, said spring portions each supporting only oneof saidplurality of oil seal rings.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US414216A 1973-07-18 1973-11-09 Oil seal means of a rotary engine Expired - Lifetime US3895892A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48080284A JPS5236206B2 (en, 2012) 1973-07-18 1973-07-18

Publications (1)

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US3895892A true US3895892A (en) 1975-07-22

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US414216A Expired - Lifetime US3895892A (en) 1973-07-18 1973-11-09 Oil seal means of a rotary engine

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US (1) US3895892A (en, 2012)
JP (1) JPS5236206B2 (en, 2012)
DE (1) DE2356469B2 (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199308A (en) * 1978-10-02 1980-04-22 Arthur D. Little, Inc. Axial compliance/sealing means for improved radial sealing for scroll apparatus and scroll apparatus incorporating the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2614587A1 (de) * 1976-04-05 1977-10-13 Metallgesellschaft Ag Verfahren zum eindampfen wasserhaltiger fluessigkeiten
FI76699C (fi) * 1986-06-25 1988-12-12 Ahlstroem Oy Indunstare av roertyp.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3400939A (en) * 1966-01-03 1968-09-10 Curtiss Wright Corp Oil seal construction for rotary engines
US3477732A (en) * 1965-04-14 1969-11-11 Sealed Power Corp Spacer-expander
US3718412A (en) * 1971-10-01 1973-02-27 Ramsey Corp Pumping seal for rotary piston engines
US3768936A (en) * 1971-10-27 1973-10-30 Ramsey Corp Combination apex and side seals for rotary piston engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477732A (en) * 1965-04-14 1969-11-11 Sealed Power Corp Spacer-expander
US3400939A (en) * 1966-01-03 1968-09-10 Curtiss Wright Corp Oil seal construction for rotary engines
US3718412A (en) * 1971-10-01 1973-02-27 Ramsey Corp Pumping seal for rotary piston engines
US3768936A (en) * 1971-10-27 1973-10-30 Ramsey Corp Combination apex and side seals for rotary piston engines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199308A (en) * 1978-10-02 1980-04-22 Arthur D. Little, Inc. Axial compliance/sealing means for improved radial sealing for scroll apparatus and scroll apparatus incorporating the same

Also Published As

Publication number Publication date
JPS5035506A (en, 2012) 1975-04-04
JPS5236206B2 (en, 2012) 1977-09-14
DE2356469B2 (de) 1976-01-08
DE2356469A1 (de) 1975-02-06

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