WO2008013129A1 - Tendeur automatique hydraulique - Google Patents

Tendeur automatique hydraulique Download PDF

Info

Publication number
WO2008013129A1
WO2008013129A1 PCT/JP2007/064405 JP2007064405W WO2008013129A1 WO 2008013129 A1 WO2008013129 A1 WO 2008013129A1 JP 2007064405 W JP2007064405 W JP 2007064405W WO 2008013129 A1 WO2008013129 A1 WO 2008013129A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
flange
valve body
auto tensioner
seat
Prior art date
Application number
PCT/JP2007/064405
Other languages
English (en)
Japanese (ja)
Inventor
Tadahisa Tanaka
Katsunori Mineno
Original Assignee
Ntn Corporation
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
Priority claimed from JP2006204939A external-priority patent/JP2008032086A/ja
Priority claimed from JP2006206760A external-priority patent/JP2008032131A/ja
Priority claimed from JP2006216812A external-priority patent/JP2008039135A/ja
Priority claimed from JP2006219391A external-priority patent/JP2008045591A/ja
Priority claimed from JP2006223339A external-priority patent/JP2008045692A/ja
Priority claimed from JP2006227913A external-priority patent/JP2008051209A/ja
Application filed by Ntn Corporation filed Critical Ntn Corporation
Publication of WO2008013129A1 publication Critical patent/WO2008013129A1/fr

Links

Classifications

    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
    • F16H7/0836—Means for varying tension of belts, ropes, or chains with vibration damping means of the fluid and restriction type, e.g. dashpot
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/0806—Compression coil springs
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/0848—Means for varying tension of belts, ropes, or chains with means for impeding reverse motion
    • F16H2007/0859—Check valves
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0889—Path of movement of the finally actuated member
    • F16H2007/0893—Circular path

Definitions

  • the present invention relates to a hydraulic auto tensioner used for maintaining tension of a belt that drives an auxiliary vehicle such as an alternator water pump and a compressor of an air conditioner.
  • a belt transmission device that transmits the rotation of the crankshaft of an engine to various automobile auxiliary machines is provided with a swingable pulley arm that supports a tension pulley on the slack side of the auxiliary machine driving belt, The adjustment force of the hydraulic auto tensioner is applied to the pulley arm, and the pulley is urged in the direction in which the tension pulley presses the belt, so that the tension of the belt is kept constant.
  • the hydraulic damper is provided with a plunger slidable in the sleeve at the lower end of the rod, and the inside of the cylinder is partitioned into a pressure chamber and a reservoir chamber, and the pressure chamber and the reservoir chamber are provided in the plunger.
  • a communication passage is provided, and a check valve is provided at the opening on the pressure chamber side of the passage.
  • Patent Document 1 Japanese Patent Laid-Open No. 10-19099
  • Patent Document 2 JP-A-10-306860
  • An object of the present invention is to provide a compact hydraulic auto tensioner having an axial length.
  • a sleeve is incorporated into a bottomed cylinder filled with hydraulic oil, and the bottom surface of the outward flange formed at the lower end of the sleeve
  • the outer periphery is supported by a step provided at the lower inner periphery of the cylinder, the lower end of the rod is slidably inserted into the sleeve, and the cylinder is partitioned into a pressure chamber and a reservoir chamber,
  • the elastic force of the return spring is applied to the rod to urge the rod in the direction in which the volume of the pressure chamber formed below the flange expands, and the flange is provided above the pressure chamber and the flange.
  • a configuration was adopted in which a passage communicating with the reservoir chamber was provided, and a check valve for closing the passage when the pressure in the pressure chamber became higher than the pressure in the reservoir chamber was provided in the opening on the pressure chamber side of the passage.
  • a spring seat for receiving the upper end of the return spring is provided at the upper end portion located outside from the upper end opening of the cylinder of the rod, and the upper outer periphery of the cylinder is provided at the outer peripheral portion of the spring seat.
  • a cylindrical cover portion is provided, a seal groove is formed at the upper outer periphery of the cylinder, and a sealing member incorporated in the seal groove is brought into elastic contact with the inner diameter surface of the cover portion so that the fitting surface between the cover portion and the cylinder By sealing the gap, it is possible to prevent the hydraulic oil filled in the cylinder from leaking to the outside and to prevent foreign matter from entering the cylinder from the outside.
  • the cylinder can be die-cast. Therefore, the manufacturing of the cylinder can be facilitated and the weight of the hydraulic auto tensioner can be reduced.
  • the cylinder by fitting a steel bottom cylinder to the bottom of the cylinder, it is possible to prevent damage to the bottom of the cylinder, and the upper end surface of the cylinder receives the sleeve flange. Therefore, the formation of the stepped portion can be eliminated and the processing can be facilitated.
  • a check valve a ring-shaped valve body that can freely contact and separate from a seat surface formed on the lower surface of the flange, and closes the passage upon contact.
  • a valve spring that urges the valve body toward the seat surface, even if there are multiple passages, these passages can be opened and closed simultaneously by a single valve body.
  • valve body when the valve body is formed of a material having a specific gravity smaller than that of a metal such as a synthetic resin or ceramic, the valve body can be smoothly opened and closed with respect to a pressure change in the pressure chamber, and depending on the behavior of the valve body. The influence of inertia can be reduced.
  • annular groove communicating with the passage is formed on the lower surface of the flange, and a pair of annular seat surfaces are formed on the inner peripheral surface and the lower end portion of the outer peripheral surface of the annular groove, and the valve body with respect to the seat surface If the contact is a line contact, the adsorption force of the oil film interposed between the seat surface and the seat surface can be reduced compared to when the valve body is in surface contact with the seat surface, and the valve body is separated from the seat surface. It becomes easy. For this reason, the valve body can be opened smoothly when the pressure in the pressure chamber is reduced, and a hydraulic auto tensioner with good followability of the rod against the change in the tension of the benolet can be obtained.
  • the cross-sectional shape of the pair of seat surfaces and the upper surface facing the flange of the valve body is a convex arc shape
  • the pair of seats Face Each has a tapered surface that inclines in opposite directions
  • the cross section of the upper surface facing the flange of the valve body has a convex arc shape
  • each of the pair of seat surfaces has a convex shape. It is possible to adopt a configuration in which a pair of tapered surfaces are formed in a circular arc shape and are inclined in directions opposite to the inner peripheral portion and the outer peripheral portion of the upper surface facing the flange of the valve body.
  • an outward flange is formed at the lower end portion of the sleeve into which the lower end portion of the rod is slidably inserted, and the pressure chamber is formed in the flange. Since the check valve is arranged on the circumference centering on the rod, the passage of the plunger provided at the lower end of the rod is checked. Compared to a conventional hydraulic auto tensioner that opens and closes by a valve, the force S reduces the axial length to the extent that the plunger can be omitted.
  • FIG. 1 is a front view showing a belt tension adjusting device using a hydraulic auto tensioner according to the present invention.
  • FIG. 3 Enlarged sectional view of the check valve part of the hydraulic auto tensioner shown in Fig. 2
  • FIG. 6 is a sectional view showing another example of a sealing member
  • FIG. 7 is a sectional view showing another embodiment of the hydraulic auto tensioner according to the present invention.
  • FIG. 8 is a sectional view showing still another embodiment of the hydraulic auto tensioner according to the present invention.
  • FIG. 9 (a) and (b) are cross-sectional views showing other examples in which the spring is brought into contact with the seat surface
  • Figure 1 shows the belt tension adjustment device.
  • the pulley arm 1 is supported so as to be swingable about a fulcrum shaft 2, and a tension pulley 4 that applies tension to the belt 3 is rotatably supported at the end of the swing side.
  • the pulley arm 1 is connected with a hydraulic auto tensioner 10 according to the present invention.
  • the pulley arm 1 is urged by the hydraulic auto tensioner 10 in the direction in which the tension pulley 4 presses the belt 3.
  • the hydraulic auto tensioner 10 has a bottomed cylindrical cylinder 11 whose upper end is open, and the cylinder 11 is filled with hydraulic oil.
  • a connecting piece 12 connected to the engine block A is provided on the lower surface of the cylinder 11.
  • a sleeve 13 is incorporated in the cylinder 11.
  • the sleeve 13 has an outward flange 14 at its lower end, and the outer periphery of the lower surface of the flange 14 is supported by a step portion 15 provided at the lower inner periphery of the cylinder 11.
  • the sleeve 13 has a cylindrical surface 16 and a tapered surface 17 continuing to the lower end of the cylindrical surface 16 on the inner periphery, and the inner diameter of the tapered surface 17 is gradually increased toward the lower end. Also, the lower end of the rod 19 is slidably inserted inside the sleeve 13 with a small leak gap 18 between the cylindrical surface 16 and the inside of the cylinder 11 is formed by the rod 19 and the sleeve 13. It is divided into a pressure chamber 20 and a reservoir chamber 21.
  • a connecting piece 22 connected to the pulley 1 is connected to the upper end of the rod 19 where the upper end opening force of the cylinder 11 is also located outside.
  • a spring seat 23 is fixed to the lower end of the connecting piece 22 at the upper end of the rod 19, and a return spring 24 is assembled between the spring seat 23 and the flange 14 of the sleeve 13. The return spring 24 urges the rod 19 in the direction in which the volume of the pressure chamber 20 provided below the flange 14 increases.
  • the spring seat 23 has a cylindrical cover portion 25 covering the upper outer periphery of the cylinder 11 on the outer periphery.
  • an annular seal groove 26 is formed on the upper outer periphery of the cylinder 11, and the seal member 27 composed of a 0 ring incorporated in the sheath groove 26 is in elastic contact with the inner diameter surface of the cover portion 25, The space between the fitting surfaces of the cover part 25 is sealed to prevent the hydraulic oil in the reservoir chamber 21 from leaking to the outside.
  • annular protrusion 28 is formed on the outer periphery of the upper portion of the cylinder 11 below the seal groove 26.
  • a retaining claw 29 is provided at the lower inner periphery of the cover portion 25, and the rod 19 is prevented from coming out of the cylinder 11 by the abutment of the retaining claw 29 against the annular protrusion 28.
  • the flange 14 of the sleeve 13 is formed with a plurality of arc-shaped passages 30 communicating with the pressure chamber 20 and the reservoir chamber 21 on the same circle.
  • a check valve 31 is provided at the opening on the pressure chamber 20 side to close the passage 30 when the pressure force of the pressure chamber 20 becomes higher than the pressure of the reservoir chamber 21.
  • the check valve 31 has a lower surface of the flange 14 as a seat surface 32, and a ring-shaped valve body 33 having a square cross section is provided on the seat surface 32 so as to be in contact with and separated from the seat surface 32.
  • valve spring 34 here, a thin metal plate in which a plurality of inward elastic pieces 34b are formed at equal intervals in the circumferential direction at the lower end edge of the annular portion 34a press-fitted into the inner diameter surface of the pressure chamber 20. It is possible to use a press-molded product and use a disc spring or coil spring to force the valve body 33 toward the seat surface 32 by the inertia piece 34b! .
  • the belt tension adjusting device shown in the embodiment has the above-described structure, and the tension of the belt 3 changes due to the load fluctuation of the auxiliary machine driven by the belt 3 and the change of the angular velocity of the crankshaft.
  • the rod 19 moves outward by the pressing of the return spring 24 and absorbs the slack in the belt 3.
  • a flange 14 is provided at the lower end portion of the sleeve 13 into which the lower end portion of the rod 19 is slidably inserted, and the pressure chamber 20 and the reservoir chamber 21 are communicated with the flange 14.
  • the check valve 31 is arranged on the circumference centering on the rod 19, so it is provided at the lower end of the rod.
  • the seal member 27 is attached to the seal groove 26 formed in the upper outer periphery of the cylinder 11, and the space between the cover portion 25 of the cylinder 11 and the spring seat 23 is sealed, so that the operation filled in the cylinder 11 is performed. Oil can be prevented from leaking to the outside, and foreign matter can be prevented from entering the cylinder 11.
  • a seal member 27 made of an O-ring is used to seal between the cylinder 11 and the cover portion 25.
  • a plurality of seal lips 27 a and 27 b formed on the outer periphery of the oil seal may be brought into elastic contact with the inner periphery of the cover portion 25 to seal between the cylinder 11 and the cover portion 25.
  • the number of seal lips, lip shape, and binding force can be freely designed.
  • valve body 33 of the check valve 31 is formed of a material having a specific gravity smaller than that of a metal such as synthetic resin or ceramics, the valve body 33 smoothly follows the pressure change in the pressure chamber 20. At the same time, the check valve 31 can be opened and closed sensitively according to the pressure change of the pressure chamber 20 with little influence of the inertia due to the behavior of the valve body 33. [0039] For this reason, even if the belt 3 vibrates at a high frequency, there is no inconvenience of insufficient supply of hydraulic oil into the pressure chamber 20. The hydraulic oil in the pressure chamber 20 reliably changes the tension of the belt. Can be absorbed.
  • valve body 33 can be enlarged because the mass of the valve body 33 is small, and the cross-sectional area of the passage 30 can be increased. Oil can flow smoothly into the pressure chamber 20.
  • FIG. 7 shows another example of the hydraulic auto tensioner 10 according to the present invention.
  • the cylinder 11 is made of an aluminum alloy
  • a steel bottom cylinder 40 is fitted to the bottom of the cylinder 11
  • the flange 14 of the sleeve 13 is supported by the upper end surface of the cylinder 40.
  • This is different from the hydraulic auto tensioner 10 shown in Fig. 2.
  • the cylinder 11 when the cylinder 11 is made of an aluminum alloy, the cylinder 11 can be made by die-casting force S, so that the production of the cylinder 11 can be facilitated and the weight of the hydraulic tensioner can be reduced. Can be achieved.
  • FIG. 8 shows still another example of the hydraulic auto tensioner according to the present invention.
  • an annular groove 41 communicating with the plurality of passages 30 is formed on the lower surface of the flange 14, and a circular arc surface having a convex cross section at the inner peripheral surface and the lower end of the outer peripheral surface of the annular groove 41.
  • the annular seat surfaces 42a and 42b are formed, while the cross-sectional shape of the upper surface 43 of the annular valve body 33 is convex so that the contact of the valve body 33 with the seat surfaces 42a and 42b is a line contact. Since the other configuration is the same as that of the hydraulic auto tensioner 10 shown in FIG. 2, the same components are denoted by the same reference numerals and description thereof is omitted.
  • FIGS. 9A and 9B show another example in which the valve element 33 is brought into line contact with the seat surfaces 42a and 42b.
  • the seat surfaces 42a and 42b formed on the inner peripheral surface and the outer peripheral surface of the annular groove 41 are tapered surfaces that are inclined in opposite directions, and the valve body 33 of the valve element 33 is opposed to the seat surfaces 42a and 42b.
  • An arcuate upper surface 43 is brought into contact.
  • the cross-sectional shape of the seat surfaces 42a and 42b formed on the inner peripheral surface and the outer peripheral surface of the annular groove 41 is a convex arc surface
  • the inner peripheral surface of the upper surface of the valve element 33 is Form a pair of tapered surfaces 44a, 44b inclined in directions opposite to each other on the outer periphery and the outer peripheral portion, and rub the teno surfaces 44a, 44b on the sheet surfaces 42a, 42b!

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

L'invention concerne un tendeur automatique hydraulique de longueur axiale réduite. Un manchon (13) est monté dans un cylindre (11) rempli d'huile hydraulique et une bride (14) disposée à l'extrémité inférieure du manchon (13) est supportée par un gradin (15) disposé dans la partie inférieure de la périphérie interne du cylindre (11). Une tige (19) est installée de façon coulissante dans le manchon (13) pour séparer l'intérieur du cylindre (11) en une chambre de pression (20) et une chambre de réservoir (21), et la tige (19) est poussée par un ressort de rappel (24) dans la direction de l'augmentation du volume de la chambre de pression (20). Un trajet en arc circulaire (30) interconnectant la chambre de pression (20) et la chambre de réservoir (21) est formé dans la bride (14), le trajet (30) étant apte à être ouvert et fermé par un clapet de non retour (31), ce qui permet au tendeur automatique hydraulique d'avoir une longueur axiale réduite.
PCT/JP2007/064405 2006-07-27 2007-07-23 Tendeur automatique hydraulique WO2008013129A1 (fr)

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
JP2006204939A JP2008032086A (ja) 2006-07-27 2006-07-27 油圧式オートテンショナ
JP2006-204939 2006-07-27
JP2006-206760 2006-07-28
JP2006206760A JP2008032131A (ja) 2006-07-28 2006-07-28 油圧式オートテンショナ
JP2006-216812 2006-08-09
JP2006216812A JP2008039135A (ja) 2006-08-09 2006-08-09 油圧式オートテンショナ
JP2006-219391 2006-08-11
JP2006219391A JP2008045591A (ja) 2006-08-11 2006-08-11 油圧式オートテンショナ
JP2006-223339 2006-08-18
JP2006223339A JP2008045692A (ja) 2006-08-18 2006-08-18 油圧式オートテンショナ
JP2006227913A JP2008051209A (ja) 2006-08-24 2006-08-24 油圧式オートテンショナ
JP2006-227913 2006-08-24

Publications (1)

Publication Number Publication Date
WO2008013129A1 true WO2008013129A1 (fr) 2008-01-31

Family

ID=38981441

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/064405 WO2008013129A1 (fr) 2006-07-27 2007-07-23 Tendeur automatique hydraulique

Country Status (1)

Country Link
WO (1) WO2008013129A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014154210A1 (fr) * 2013-03-28 2014-10-02 Schaeffler Technologies Gmbh & Co. Kg Tendeur de moyen de traction hydraulique à comportement d'amortissement dynamique constant
CN113226902A (zh) * 2019-03-22 2021-08-06 日立建机株式会社 工程机械

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000120816A (ja) * 1998-10-13 2000-04-28 Otics Corp 油圧式オートテンショナ
JP2003139206A (ja) * 2001-11-01 2003-05-14 Showa Corp 油圧式ベルトテンショナー
JP2003156108A (ja) * 2001-11-20 2003-05-30 Ntn Corp 油圧式オートテンショナ
JP2003166607A (ja) * 2001-11-28 2003-06-13 Otics Corp 油圧式オートテンショナ
JP2005214232A (ja) * 2004-01-27 2005-08-11 Ntn Corp 補機用オートテンショナ
JP2006017258A (ja) * 2004-07-02 2006-01-19 Toyota Motor Corp オイル封入型テンショナ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000120816A (ja) * 1998-10-13 2000-04-28 Otics Corp 油圧式オートテンショナ
JP2003139206A (ja) * 2001-11-01 2003-05-14 Showa Corp 油圧式ベルトテンショナー
JP2003156108A (ja) * 2001-11-20 2003-05-30 Ntn Corp 油圧式オートテンショナ
JP2003166607A (ja) * 2001-11-28 2003-06-13 Otics Corp 油圧式オートテンショナ
JP2005214232A (ja) * 2004-01-27 2005-08-11 Ntn Corp 補機用オートテンショナ
JP2006017258A (ja) * 2004-07-02 2006-01-19 Toyota Motor Corp オイル封入型テンショナ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014154210A1 (fr) * 2013-03-28 2014-10-02 Schaeffler Technologies Gmbh & Co. Kg Tendeur de moyen de traction hydraulique à comportement d'amortissement dynamique constant
CN113226902A (zh) * 2019-03-22 2021-08-06 日立建机株式会社 工程机械
CN113226902B (zh) * 2019-03-22 2022-11-25 日立建机株式会社 工程机械

Similar Documents

Publication Publication Date Title
JP2013204767A (ja) 油圧式オートテンショナ
WO2020032094A1 (fr) Tendeur de chaîne
JP2016145612A (ja) 油圧式オートテンショナ
JP6257950B2 (ja) 油圧式オートテンショナ
WO2020189403A1 (fr) Tendeur de chaîne
WO2008013129A1 (fr) Tendeur automatique hydraulique
US20100267503A1 (en) Hydraulic tensioning element for a traction mechanism drive
JP2010276152A (ja) オートテンショナ
JP6263409B2 (ja) 油圧式オートテンショナ
WO2007097261A1 (fr) Tendeur automatique hydraulique
JP2006312969A (ja) 油圧式オートテンショナ
WO2020184322A1 (fr) Tendeur de chaîne
JP2007071310A (ja) 油圧式オートテンショナ
JP7100467B2 (ja) チェーンテンショナ
WO2015115555A1 (fr) Tendeur automatique hydraulique
JP5311226B2 (ja) オートテンショナ
WO2018168745A1 (fr) Auto-tendeur hydraulique
JP2008180269A (ja) 油圧式オートテンショナ
JP2008045692A (ja) 油圧式オートテンショナ
JP2008248925A (ja) 油圧式オートテンショナ
JP2008051209A (ja) 油圧式オートテンショナ
JP2008175271A (ja) 油圧式オートテンショナ
JP6505794B2 (ja) 油圧式オートテンショナ
JP2008267456A (ja) 油圧式オートテンショナ
JP2009024715A (ja) オートテンショナ

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07791138

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: RU

122 Ep: pct application non-entry in european phase

Ref document number: 07791138

Country of ref document: EP

Kind code of ref document: A1