WO2016154651A1 - Dispositif servant à mesurer la friction sur un ensemble cylindre-piston - Google Patents

Dispositif servant à mesurer la friction sur un ensemble cylindre-piston Download PDF

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Publication number
WO2016154651A1
WO2016154651A1 PCT/AT2016/050081 AT2016050081W WO2016154651A1 WO 2016154651 A1 WO2016154651 A1 WO 2016154651A1 AT 2016050081 W AT2016050081 W AT 2016050081W WO 2016154651 A1 WO2016154651 A1 WO 2016154651A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder head
sealing
cylinder
piston
sealing ring
Prior art date
Application number
PCT/AT2016/050081
Other languages
German (de)
English (en)
Inventor
Michael Erich HAMMER
Stefan SATSCHEN
Original Assignee
Avl List 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 Avl List Gmbh filed Critical Avl List Gmbh
Publication of WO2016154651A1 publication Critical patent/WO2016154651A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/02—Details or accessories of testing apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F11/00—Arrangements of sealings in combustion engines 
    • F02F11/002—Arrangements of sealings in combustion engines  involving cylinder heads
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0061—Force sensors associated with industrial machines or actuators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F11/00—Arrangements of sealings in combustion engines 
    • F02F11/005—Arrangements of sealings in combustion engines  involving cylinder liners

Definitions

  • the invention relates to a device for measuring friction on a cylinder-piston arrangement, wherein a reciprocating at least one piston ring, reciprocating piston is arranged in a cylinder liner, with at least one formed by a sealing ring first sealing element between the cylinder liner and a cylinder head, said a piston running surface of the cylinder liner is sealed relative to the cylinder head and the first sealing element between the piston running surface and a projecting into the cylinder liner paragraph of the cylinder head is arranged, wherein the first sealing element is arranged in a circumferential annular receiving groove of the paragraph comprehensive sealing ring carrier, which fixed to the cylinder head is connectable.
  • a measuring device for measuring the friction of a reciprocating in a cylinder liner piston is known.
  • a retaining ring is arranged between the cylinder head and a liner carrier, wherein between the retaining ring and the upper end of the cylinder liner an annular gap is formed, which is filled by a metallic sealing plate.
  • a device for measuring the piston friction in an internal combustion engine wherein the cylinder liner is arranged in a cylinder, and wherein between the cylinder and the cylinder liner a plurality of O-rings are arranged.
  • a device for measuring friction on a cylinder-piston assembly wherein a at least one piston ring exhibiting, reciprocating piston is arranged in a cylinder liner. Between the cylinder liner and the cylinder head is at least one - -
  • Sealing element is formed, wherein an inner circumferential surface of the cylinder liner is sealed relative to the cylinder head and the sealing element between the inner circumferential surface and a projecting into the cylinder liner paragraph of the cylinder head is arranged.
  • the cylinder liner is largely decoupled from the cylinder head.
  • the sealing element is introduced directly into a groove which is formed in the shoulder of the cylinder head. Due to the spatial narrowness, however, the groove depth and thus the ring height of the sealing element are severely limited. This leads to significant edge pressures of the sealing ring in the groove, caused by the gas pressure.
  • the combination of edge pressure and relative movement of the cylinder head and thus the groove against the cylinder liner leads to considerable wear. As a result, there is a decrease in the sealing effect and gas leaks ("blow-out") from the cylinder. This falsifies both the combustion and the force measurement at the device.
  • JP 2010243390 A discloses a device for friction measurement in an engine with a cylinder-piston arrangement. Between the cylinder liner and the cylinder head, a sealing device is arranged. The sealing device has a receiving groove for receiving a sealing element and is releasably secured by a screw on the cylinder head. The sealing element seals the cylinder head against the cylinder surface.
  • the object of the invention is to avoid the disadvantages mentioned and to increase the measurement accuracy and fatigue strength in a device for measuring friction of the type mentioned.
  • the sealing ring carrier has a sleeve portion and a normal to the axis of the cylinder liner formed ring portion, wherein the receiving groove is executed in the sleeve portion.
  • the wear of such measuring devices can be reduced because the sealing ring carrier can be made of a different material than the cylinder head, which allows the use of particularly resistant materials such as stainless or chromium steel, cast iron or Nirisist.
  • this solution allows the application of coatings to increase the wear resistance, for example, by chromium-nitride coatings.
  • hardening of the particularly contaminated surface for example by plasma nitriding, is possible in a simple and cost-effective manner.
  • the sealing ring carrier Due to the firm connectivity, a high density and at the same time exchangeability of the sealing ring carrier is provided.
  • the sealing ring carrier can be replaced on the one hand with decreasing functionality, on the other hand, the measuring device can be easily operated with different sealing element variants or different cylinder liner diameters.
  • the first sealing element can be designed as a multiple sealing ring.
  • the first sealing element can be designed as a multiple sealing ring.
  • the sealing ring carrier can be connected to the cylinder head by at least one screw connection and / or an adhesive. Other detachable or non-detachable connection variants are possible.
  • the sleeve portion surrounds the protruding into the cylinder liner paragraph of the cylinder head and is formed substantially normal to the ring portion.
  • the central axis of the sleeve portion extends parallel to the axis of the cylinder liner.
  • the receiving groove for the first sealing element is preferably arranged in an outer circumferential surface of the sleeve portion.
  • the sealing ring carrier thus has an L-shaped cross-section along its circumference, wherein the first leg is formed by the sleeve section and the ring section forms the second leg.
  • the sleeve portion surrounding an outer circumferential surface of the shoulder is formed substantially normal to the ring portion.
  • Sleeve section and ring section are conveniently designed in one piece.
  • the sleeve and ring sections are divided or designed as separate components.
  • the split version allows the use of an additional undivided sealing ring, which has additional sealing advantages.
  • the annular section is arranged in an annular recess in a cylinder head sealing surface of the cylinder head.
  • the annular recess forms a recess in the cylinder head sealing surface which substantially corresponds to the shape of the ring portion.
  • the sealing ring carrier is screwed with its ring portion by means of fastening screws on the cylinder head. As a result, sealing effect and easy mounting of the sealing ring carrier can be ensured.
  • the cylinder head has at least one threaded insert, preferably made of steel, for receiving at least one fastening screw.
  • the threaded insert can be glued or bolted in the cylinder head, with larger pitches can be used.
  • threads with a smaller nominal diameter or - - Use a smaller thread pitch, but thanks to the robust thread inserts, they can be subjected to higher preload force.
  • the threaded insert in particular with cylinder heads formed from aluminum, prevents damage to the threads of the screw connections when the sealing ring carrier is replaced several times, and a stronger pressing of the sealing ring carrier can be achieved.
  • the receiving groove for the first sealing element is preferably arranged in an outer circumferential surface of the sleeve portion.
  • the sleeve portion has an outer circumferential surface running parallel to the axis of the cylinder liner and an inner circumferential surface inclined relative to the axis of the cylinder liner, wherein the distance between the inner circumferential surface and outer circumferential surface increases in the direction away from the annular portion.
  • an outer lateral surface of the shoulder is preferably formed frusto-conical corresponding to the inner circumferential surface of the sleeve portion, wherein a cone angle formed by a generatrix of the truncated cone and the cylinder axis of the cylinder opens towards the side of the cylinder head.
  • the cone angle can be, for example, between 5 ° and 30 °.
  • the sealing ring carrier preferably the sleeve portion of the sealing ring carrier, a correspondingly the outer circumferential surface of the paragraph reciprocal conically shaped inner circumferential surface of the paragraph, which includes the outer surface of the paragraph.
  • the conical corresponding shape facilitates assembly and allows in a simple way a centering of the sealing ring carrier on the shoulder, wherein the sealing ring carrier rests in the mounted state on the shoulder or can have a minimum distance to this.
  • an adhesive and / or sealing means is arranged between the sleeve section and the shoulder and / or between the ring section and the cylinder head.
  • the sealing ring carrier is sealed by a labyrinth seal against the cylinder head.
  • the ring section has at least one or at least one sealing groove recess on its side facing the cylinder head in the direction of the axis of the cylinder liner, and the cylinder head has at least one correspondingly reciprocal sealing groove recess or at least one sealing projection on the side facing the ring section wherein each of the sealing projection engages in the corresponding reciprocally shaped DichtungsnutausEnglishung.
  • Dichtungsnutaus- recesses and sealing projections may be performed in sections, but advantageously they are each running circumferentially.
  • a further increase in the sealing effect can be achieved if at least one second sealing element, for example an O-ring, is arranged between the sealing ring carrier and the cylinder head.
  • the second sealing element is advantageously arranged between a preferably conically shaped outer edge surface of the annular portion and an edge region of the recess.
  • FIG. 1 shows a device according to the invention in a first embodiment in a longitudinal section through a cylinder according to the line I - I in Fig. 4.
  • Fig. 2 shows the detail II of Fig. 1;
  • Fig. 3 shows the device in a section along the line III - III in
  • FIGS. 1 to 3 shows the cylinder head from FIGS. 1 to 3 in a combustion chamber side view
  • FIG. 5 shows a cylinder head of a device according to the invention in a second embodiment with disassembled sealing ring carrier in a section along the line VV in Fig. 7. - -
  • FIG. 6 shows detail VI from FIG. 5;
  • FIG. 7 shows the cylinder head from FIG. 5 with mounted sealing ring carrier in a combustion chamber side view
  • Fig. 8 is a sealing ring carrier of FIG. 7 in a partially sectioned
  • FIG. 9 shows detail IX from FIG. 8; FIG. and
  • FIG. 10 shows a seal carrier of a device according to the invention in a third embodiment in a longitudinal section.
  • the device 1 shown in the figures for friction measurement of the frictional forces on a cylinder-piston arrangement with a reciprocating in a cylinder liner 2 piston 3 comprises a base unit 4, a base plate 5, a sensor carrier 6 for receiving 3 D Force sensors 7, a liner carrier 8 and a cylinder head 9, wherein the cylinder liner 2 is fixed to the liner carrier 8.
  • the piston 3 has one or more piston rings 3a. Between the cylinder liner 2 and the liner carrier 8, a coolant jacket 10 is formed, which is connected to inlet and outlet lines 10a, 10b. With reference numeral 2a, the axis of the cylinder liner 2 is designated.
  • the cylinder head 9 has a projecting into the cylinder liner 2 disc-shaped shoulder 11.
  • the shoulder 11 is sealed off from the piston running surface 2b of the cylinder liner 2 via a first sealing element 12 formed by a sealing ring, which is pressed by the gas forces against the piston running surface 2b of the cylinder liner 2 in a manner similar to a piston ring.
  • the special sealing by means of the annular first sealing element 12 and the heel 11 in the cylinder head 9 prevents the gas forces acting axially on the cylinder liner 2.
  • these also have no direct influence on the measurement result and it is primarily the frictional forces of the piston 3 and the piston side forces transmitted to the force sensors 7.
  • the cylinder liner 2 is thus largely decoupled from the basic unit 4 and the cylinder head 9 and is connected to this only by the first sealing element 12 and the force sensors 7.
  • the first sealing element 12 may be formed as a multiple sealing ring, for example as a double ring, as shown in Fig. 10. - -
  • the first sealing element 12 is arranged according to the invention in a circumferential annular receiving groove 13 of the paragraph 11 comprehensive sealing ring carrier 14, which is fixedly connected to the cylinder head 9, for example by screwing or gluing.
  • the substantially annular sealing ring carrier 14 may be made of stainless steel or cast iron.
  • the concentric with the cylinder liner 2 trained or arranged sealing ring carrier 14 has along its circumferential direction has a substantially L-shaped cross-section with a first leg and a second leg, wherein the first leg is formed by a sleeve portion 15 and the second leg by a ring portion 16 , Sleeve portion 15 and ring portion 16 are integrally formed, wherein the flat ring portion 15 substantially normal to the axis 2a of the cylinder liner 2 and the outer circumferential surface I Ia of paragraph 11 surrounding sleeve portion 15 is formed substantially normal to the ring portion 16.
  • the receiving groove 13 for the first sealing element 12 is formed in the sleeve portion 15, especially in an outer circumferential surface 15 a of the sleeve portion 15.
  • the cylinder head sealing surface 17 of the cylinder head 9 has an annular recess 18 for receiving the annular portion 16 of the sealing ring carrier 14.
  • the recess 18 in this case has an edge region 18a, which extends substantially parallel to the axis 2a of the cylinder liner 2, and a parallel to the cylinder head sealing surface 17 extending bottom.
  • the ring portion 16 of the sealing ring carrier 14 is attached via at least one screw 19 to the cylinder head 9.
  • fastening screws 19a are screwed into threads made in the cylinder head 9. As can be seen from FIG.
  • screw connections 19 can be provided in the region of the valve openings 20 of the gas exchange valves of the cylinder-piston arrangement than in the area of the valve bridges 21 lying between the valve openings 20 in order to absorb the higher load occurring in the region of the valve openings 20.
  • the threaded inserts 19b can be glued to the cylinder head 9, screwed or secured in any other way.
  • screwing high threaded slopes can be provided to ensure a solid anchoring of the threaded inserts 19b.
  • For the thread of the mounting screws 19a then smaller inclinations can be provided. This ensures that the necessary biasing force of the fastening screws 19a can be accommodated by the cylinder head 9 without damage and that a - - Repeated exchange of the sealing ring carrier 14 without adverse consequences remains.
  • With reference numeral 19c lowered holes for receiving the mounting screws are designated.
  • an adhesive and / or sealing means 22, for example a silicone adhesive, may be applied.
  • the sealing ring carrier 14 is sealed by a labyrinth seal 23 with respect to the cylinder head 9, wherein the annular section 16 on the side facing the cylinder head 9 has a collar-like annular sealing projection 23a and the cylinder head 9 on the side facing the ring portion 16 has a correspondingly reciprocal circumferential annular sealing groove recess 23b formed thereon, wherein the sealing projection 23a engages in the corresponding reciprocally formed DichtungsnutausEnglishung 23b.
  • sealing projection 23a an additional reinforcement of the sealing ring carrier 14.
  • sealing projections 23a and Dichtungsnut- recesses 23b are each circumferentially executed - in variants of the invention, but you can only sections run, or circumferential groove recesses 23b and partially sealing projections 23a may be used.
  • At least one second sealing element 24 may be arranged between the sealing ring carrier 14 and the cylinder head 9, as shown in FIG. 10.
  • the second sealing element 24 formed by an O-ring is arranged, for example, between a conically shaped or chamfered outer edge surface 16a of the annular section 16 and an edge region 18a of the recess 18.
  • the outer edge surface 16a of the ring portion is performed running in a direction away from the piston 3 direction. This means that the diameter of the annular portion 16 near the piston 3 is greater than on its side facing away from the piston 3 side. As a result, a good seal is ensured by the second sealing element 24 and it can be positioned against displacement.
  • the outer lateral surface 11a of the shoulder 11 is frustoconically shaped in the case of the embodiment variants illustrated in FIGS. 5 to 10, wherein - -
  • the by a generatrix I Ib of the truncated cone and the axis 2a or a parallel 2a 'to the axis 2a of the cylinder liner 2 clamped cone angle ⁇ opens to the side of the cylinder head 9 out.
  • the cone angle ⁇ is between about 5 ° and 30 °, for example 10 °.
  • the sleeve portion 15 of the sealing ring carrier 14 has a corresponding to the outer circumferential surface I Ia of the paragraph 11, a reciprocally tapered inner circumferential surface 15b, which encompasses the outer circumferential surface I Ia of the paragraph 11.
  • the inner lateral surface 15b is also inclined relative to the axis 2a or a parallel thereto 2a 'by the extent of the cone angle ⁇ .
  • the outer circumferential surface 11a of the shoulder 11 and the inner circumferential surface 15b of the sleeve portion 15 thus form a sealing conical seat.
  • the conical seat facilitates assembly and enables easy centering of the sealing ring carrier 14 on the shoulder 11 of the cylinder head 9.
  • the sleeve portion 15 has a parallel to the axis 2a of the cylinder liner 2 extending outer surface 15a and an inclined to the axis 2a of the cylinder liner 2 extending inner circumferential surface 15b, wherein the distance between the inner circumferential surface 15b and outer lateral surface 15a in the annular portion 16th away leading direction increases.
  • the outer lateral surface 11a of the shoulder is designed correspondingly correspondingly.
  • the conical shape of the inner circumferential surface 15b of the sleeve portion 15 allows a sufficiently large wall thickness of the sleeve portion 15 in the region of the receiving groove 13. Cylinder head side can be prevented by the truncated cone-shaped paragraph 11, a masking of the valve areas. In principle, however, a cylindrical design is also possible, as shown in FIGS. 1 to 4. In variants not shown either only the paragraph 11 or only the sleeve portion 15 may be made conical.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un dispositif (1) servant à mesurer la friction sur un ensemble cylindre-piston. Un piston (3) comportant au moins un segment de piston (3a), effectuant des mouvements de va-et-vient est disposé dans une chemise de cylindre (2). Ledit ensemble comprend au moins un premier élément d'étanchéité (12) formé par une bague d'étanchéité entre la chemise de cylindre (2) et une tête de cylindre (9). Une surface de roulement de piston (2b) de la chemise de cylindre (2) est étanchéifiée par rapport à la tête de cylindre (9). Le premier élément d'étanchéité (12) est disposé entre la surface de roulement de piston (2a) et un retrait (11), dépassant dans la chemise de cylindre (2), de la tête de cylindre (9). Le premier élément d'étanchéité (12) est disposé dans une rainure de réception (13) périphérique de forme annulaire d'un support de bague d'étanchéité (14) renfermant le retrait (11), lequel peut être relié de manière solidaire à la tête de cylindre (9). L'invention vise à améliorer la précision de mesure. Le support de bague d'étanchéité (14) comporte à cet effet une partie de douille (15) et une partie annulaire (16) réalisée de manière normale par rapport à l'axe (2a) de la chemise de cylindre (2). La rainure de réception (13) est réalisée dans la partie de douille (15).
PCT/AT2016/050081 2015-03-30 2016-03-30 Dispositif servant à mesurer la friction sur un ensemble cylindre-piston WO2016154651A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50250/2015A AT516996B1 (de) 2015-03-30 2015-03-30 Vorrichtung zur reibungsmessung an einer zylinder-kolben-anordnung
ATA50250/2015 2015-03-30

Publications (1)

Publication Number Publication Date
WO2016154651A1 true WO2016154651A1 (fr) 2016-10-06

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Application Number Title Priority Date Filing Date
PCT/AT2016/050081 WO2016154651A1 (fr) 2015-03-30 2016-03-30 Dispositif servant à mesurer la friction sur un ensemble cylindre-piston

Country Status (2)

Country Link
AT (1) AT516996B1 (fr)
WO (1) WO2016154651A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109632287A (zh) * 2018-12-13 2019-04-16 西安航天动力研究所 一种径向密封摩擦力-密封性能检测装置
CN112610356A (zh) * 2020-12-11 2021-04-06 中国北方发动机研究所(天津) 一种浮动缸套密封结构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5622921A (en) * 1979-08-01 1981-03-04 Hino Motors Ltd Measuring instrument for frictional force of piston
JPS6031037A (ja) * 1983-07-30 1985-02-16 Hino Motors Ltd ピストンフリクションの測定装置
JPS61112250U (fr) * 1984-12-26 1986-07-16
JPH11108801A (ja) * 1997-10-08 1999-04-23 Nippon Soken Inc 内燃機関の摩擦力計測装置
JP2010243390A (ja) * 2009-04-08 2010-10-28 Honda Motor Co Ltd エンジンの摩擦力測定装置
CN103293005A (zh) * 2013-05-31 2013-09-11 中国兵器工业集团第七0研究所 一种点火状态下气缸套与活塞摩擦力测试用浮动缸套机构

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT514582B1 (de) * 2013-10-04 2015-02-15 Avl List Gmbh Einrichtung zur Reibungsmessung an einer Zylinder-Kolben-Anordnung
AT514794B1 (de) * 2013-11-07 2015-06-15 Avl List Gmbh Einrichtung zur Reibungsmessung an einer Zylinder-Kolben-Anordnung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5622921A (en) * 1979-08-01 1981-03-04 Hino Motors Ltd Measuring instrument for frictional force of piston
JPS6031037A (ja) * 1983-07-30 1985-02-16 Hino Motors Ltd ピストンフリクションの測定装置
JPS61112250U (fr) * 1984-12-26 1986-07-16
JPH11108801A (ja) * 1997-10-08 1999-04-23 Nippon Soken Inc 内燃機関の摩擦力計測装置
JP2010243390A (ja) * 2009-04-08 2010-10-28 Honda Motor Co Ltd エンジンの摩擦力測定装置
CN103293005A (zh) * 2013-05-31 2013-09-11 中国兵器工业集团第七0研究所 一种点火状态下气缸套与活塞摩擦力测试用浮动缸套机构

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109632287A (zh) * 2018-12-13 2019-04-16 西安航天动力研究所 一种径向密封摩擦力-密封性能检测装置
CN112610356A (zh) * 2020-12-11 2021-04-06 中国北方发动机研究所(天津) 一种浮动缸套密封结构

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Publication number Publication date
AT516996B1 (de) 2017-11-15
AT516996A1 (de) 2016-10-15

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