WO2018168745A1 - Auto-tendeur hydraulique - Google Patents

Auto-tendeur hydraulique Download PDF

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Publication number
WO2018168745A1
WO2018168745A1 PCT/JP2018/009437 JP2018009437W WO2018168745A1 WO 2018168745 A1 WO2018168745 A1 WO 2018168745A1 JP 2018009437 W JP2018009437 W JP 2018009437W WO 2018168745 A1 WO2018168745 A1 WO 2018168745A1
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WO
WIPO (PCT)
Prior art keywords
oil
hydraulic
cylinder
rod
auto tensioner
Prior art date
Application number
PCT/JP2018/009437
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English (en)
Japanese (ja)
Inventor
直人 本多
Original Assignee
Ntn株式会社
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 Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2018168745A1 publication Critical patent/WO2018168745A1/fr

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    • 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
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley

Definitions

  • This invention relates to a hydraulic auto tensioner that generates a damping force using hydraulic oil.
  • Automobile accessories such as alternators, car air conditioners, and water pumps, are connected to the engine crankshaft by an accessory belt and driven through the accessory belt.
  • a pulley arm provided so as to be swingable about a fulcrum shaft, a tension pulley rotatably attached to the pulley arm, and the tension pulley as an auxiliary belt.
  • a tension adjusting device including an auto tensioner that urges the pulley arm in the pressing direction is used.
  • this hydraulic auto tensioner has a hydraulic damper mechanism that buffers the downward force applied to the rod from the accessory belt with the hydraulic oil inside the cylinder.
  • a hydraulic damper mechanism that buffers the downward force applied to the rod from the accessory belt with the hydraulic oil inside the cylinder.
  • an annular oil seal is attached to the inner periphery of the upper end opening of the cylinder so as to come into sliding contact with the movement of the rod.
  • the above hydraulic auto tensioner seals the hydraulic oil in the cylinder with an oil seal attached to the inner periphery of the upper end opening of the cylinder.
  • a hydraulic auto tensioner is used for a long period of time, a small amount of hydraulic oil leaks from the hydraulic auto tensioner, and the hydraulic leak may continue to adhere to the auxiliary belt and peripheral parts. It turned out to be. If the hydraulic oil adheres to the auxiliary belt and peripheral parts, it causes slippage of the auxiliary belt and malfunction of the peripheral parts.
  • the inventors of the present application investigated the cause of a small amount of hydraulic oil spilling and leaking from the hydraulic auto tensioner, and when the rod moves up and down according to the tension fluctuation of the auxiliary belt of the automobile, it accompanies the movement of the rod. It has been found that there is a phenomenon in which hydraulic oil is scraped out at the sliding contact portion of the oil seal, and the hydraulic oil oozes out from the hydraulic auto tensioner due to the scraping action.
  • the problem to be solved by the present invention is to provide a hydraulic auto tensioner that is unlikely to cause a phenomenon in which hydraulic oil oozes and leaks from the tensioner.
  • the present invention provides a hydraulic auto tensioner having the following configuration.
  • a cylinder with an open top and a closed bottom;
  • a rod inserted into the cylinder to be movable up and down;
  • a return spring for urging the rod upward;
  • a hydraulic damper mechanism for buffering downward force applied to the rod with hydraulic oil inside the cylinder;
  • a hydraulic auto tensioner provided with an annular oil seal attached to the inner periphery of the upper end opening of the cylinder so as to come into sliding contact with the movement of the rod,
  • a hydraulic auto tensioner wherein an oil absorber that absorbs hydraulic oil that oozes upward from the inside of the cylinder through the sliding contact portion of the oil seal is provided above the oil seal.
  • the oil absorber is an annular body arranged on the upper side of the annular oil seal.
  • the oil absorber is annular, the hydraulic oil that oozes out from any circumferential position of the sliding contact portion of the annular oil seal can be reliably absorbed. Therefore, even if the hydraulic auto tensioner is attached in any orientation, the leakage of hydraulic oil from the hydraulic auto tensioner can be prevented.
  • the oil absorber may be composed of a large number of fibers.
  • the oil absorber is preferably fixed on the upper side of the oil seal with an adhesive.
  • the hydraulic auto tensioner according to the present invention is an operation that oozes upward from the inside of the cylinder through the sliding contact portion of the oil seal when a working oil scraping action occurs at the sliding contact portion of the oil seal as the rod moves. Oil is absorbed by the oil absorber on the upper side of the oil seal. Therefore, even when the hydraulic auto tensioner is used for a long period of time, it is possible to prevent the leakage of hydraulic oil from the hydraulic auto tensioner.
  • FIG. 2 The front view which shows the tension adjusting device incorporating the hydraulic auto tensioner of 1st Embodiment of this invention
  • Sectional view along the line II-II in FIG. 2 is an enlarged cross-sectional view near the oil seal of FIG.
  • FIG. 3 is an enlarged cross-sectional view showing a part of FIG.
  • Front view showing a tension adjusting apparatus incorporating a hydraulic auto tensioner according to a second embodiment of the present invention.
  • FIG. 1 shows a tension adjusting device incorporating a hydraulic auto tensioner 1 according to a first embodiment of the present invention.
  • the tension adjusting device includes a tension pulley 3 that contacts the belt 2, a pulley arm 4 that supports the tension pulley 3, and a hydraulic auto tensioner 1 that biases the pulley arm 4 in a direction to press the tension pulley 3 against the belt 2.
  • the belt 2 is an accessory belt that transmits rotation of a crankshaft (not shown) to an accessory such as an alternator or a water pump.
  • the lower connecting piece 5 of the hydraulic auto tensioner 1 is rotatably connected to an engine block 7 (see FIG. 2) via a lower connecting shaft 6.
  • the upper connecting piece 8 of the hydraulic auto tensioner 1 is rotatably connected to the pulley arm 4 via the upper connecting shaft 9.
  • the pulley arm 4 is supported so as to be swingable about a fulcrum shaft 10 fixed to the engine block 7.
  • the hydraulic auto tensioner 1 includes a cylinder 11, a rod 12 inserted in the cylinder 11 so as to be movable up and down, a spring seat 13 fixed to the upper end of the rod 12, and a spring seat 13.
  • a return spring 14 for urging the rod 12 upward a hydraulic damper mechanism 15 for buffering the downward force applied to the rod 12 with hydraulic oil inside the cylinder 11, and an inner periphery of the upper end opening of the cylinder 11.
  • the cylinder 11 is formed in a cylindrical shape with an upper end opened and a lower end closed.
  • a lower connecting piece 5 is integrally provided at the lower end of the cylinder 11.
  • the lower connecting piece 5 incorporates a bearing 17 that rotatably supports the lower connecting shaft 6.
  • a flange portion 18 that supports the lower end of the return spring 14 is integrally provided on the outer periphery of the cylinder 11.
  • the cylinder 11 is made of an aluminum alloy.
  • the hydraulic damper mechanism 15 includes a steel sleeve 19 fitted in the cylinder 11, a plunger 20 that is slidably inserted into the sleeve 19, and a pressure chamber 21 that is formed below the plunger 20.
  • the reservoir chamber 22 formed on the upper side of the plunger 20, the oil passage 23 communicating between the pressure chamber 21 and the reservoir chamber 22, and the flow of hydraulic oil from the reservoir chamber 22 side to the pressure chamber 21 side of the oil passage 23 Only a check valve 24 that permits only a leak, and a leak gap 25 formed between the sliding surfaces of the plunger 20 and the sleeve 19.
  • the pressure chamber 21 is filled with hydraulic oil, and the reservoir chamber 22 contains air and hydraulic oil in upper and lower layers.
  • the oil passage 23 is formed so as to penetrate the plunger 20 vertically.
  • the check valve 24 is disposed at the end of the oil passage 23 on the pressure chamber 21 side.
  • the size of the leak gap 25 is very small, and is set in a range of 0.015 to 0.080 mm as a difference in radius between the outer peripheral cylindrical surface of the plunger 20 and the inner peripheral cylindrical surface of the sleeve 19.
  • the plunger 20 is biased upward by a plunger spring 26 incorporated in the pressure chamber 21.
  • the plunger 20 supports the lower end of the rod 12, and when the rod 12 moves up and down, the plunger 20 moves up and down integrally with the rod 12.
  • a wear ring 27 is attached to the outer periphery of the insertion portion of the rod 12 into the cylinder 11.
  • the wear ring 27 is guided on the inner periphery of the cylinder 11 so that the position of the rod 12 does not deviate from the center of the cylinder 11.
  • the wear ring 27 is provided with a through hole 28 through which hydraulic oil passes.
  • the spring seat 13 includes an upper connecting piece 8 and a flange portion 29 formed on the outer periphery of the lower end of the upper connecting piece 8, and the flange portion 29 receives the upper end of the return spring 14.
  • the upper connecting piece 8 incorporates a bearing 30 that rotatably supports the upper connecting shaft 9.
  • the spring seat 13 has an outer cylindrical portion 31 extending downward from the flange portion 29 so as to face the outer diameter side of the cylinder 11.
  • the return spring 14 is a cylindrical coil spring having an inner diameter larger than the outer diameter of the cylinder 11, and is disposed coaxially on the outer diameter side of the cylinder 11.
  • a cylindrical seal fitting surface 32 having an inner diameter larger than the surface fitted to the sleeve 19 is formed on the inner periphery of the upper end opening of the cylinder 11.
  • the oil seal 16 is fitted with a tightening margin.
  • the oil seal 16 has a well-known configuration having a rubber lip that slidably contacts the outer periphery of the rod 12 as the rod 12 moves, and an annular metal core that supports the lip.
  • the oil seal 16 is restricted from moving upward by a retaining ring 33 attached to the inner periphery of the upper end opening of the cylinder 11.
  • An oil absorber 34 is fixed on the upper surface of the retaining ring 33.
  • the oil absorber 34 is an annular seat disposed above the annular oil seal 16.
  • the oil absorber 34 is composed of a large number of fibers. Recycled fibers (rayon, acetate, etc.) and natural fibers (cotton, silk, hemp, wool, etc.) can be used as the fibers, but synthetic resin fibers are preferably used. Examples of synthetic resin fibers include polyamide resins such as nylon, aromatic polyamide resins, polyethylene terephthalate, polyethylene naphthalate, polyethylene succinate, and polybutylene terephthalate. When synthetic resin fibers are used, the fibers can be prevented from swelling and dissolving with hydraulic oil, and the cost is low.
  • the oil absorber 34 is fixed to the upper surface of the retaining ring 33 with an adhesive 35.
  • the inner diameter side end of the oil absorber 34 protrudes more toward the inner diameter side than the inner diameter side end of the retaining ring 33.
  • the hydraulic auto tensioner 1 described above seals the hydraulic oil in the cylinder 11 with an oil seal 16 attached to the inner periphery of the upper end opening of the cylinder 11.
  • the hydraulic oil is scraped out at the sliding contact portion (the contact portion between the oil seal 16 and the rod 12) of the oil seal 16 as the rod 12 moves. May occur.
  • the tension of the belt 2 tends to be set low.
  • the load on the auxiliary machine driven by the belt 2 tends to increase.
  • the amplitude of the belt 2 tends to increase, and the expansion / contraction stroke of the hydraulic auto tensioner 1 tends to increase, so that the working oil is easily scraped out at the sliding contact portion of the oil seal 16.
  • the hydraulic auto tensioner 1 is used over a long period of time, the hydraulic oil scraped out at the sliding contact portion of the oil seal 16 leaks from the hydraulic auto tensioner 1 and continues to leak. May adhere to the belt 2 and peripheral parts.
  • the hydraulic oil adheres to the belt 2 and peripheral parts it causes slippage of the belt 2 and malfunction of peripheral parts.
  • the hydraulic auto tensioner 1 has a sliding contact portion of the oil seal 16 from the inside of the cylinder 11 when a hydraulic oil scraping action occurs in the sliding contact portion of the oil seal 16 as the rod 12 moves.
  • the hydraulic oil that oozes upward through the oil is absorbed by the oil absorber 34 on the upper side of the oil seal 16. Therefore, even when the hydraulic auto tensioner 1 is used over a long period of time, it is possible to prevent the leakage of hydraulic oil from the hydraulic auto tensioner 1.
  • the hydraulic auto tensioner 1 employs the annular oil absorber 34, the hydraulic oil that oozes out from any circumferential position of the sliding contact portion of the annular oil seal 16 can be reliably absorbed. it can. For this reason, even if the hydraulic auto tensioner 1 is mounted in a posture inclined in any direction, it is possible to prevent leakage of hydraulic oil from the hydraulic auto tensioner 1.
  • the hydraulic auto tensioner 1 employs a structure composed of a large number of fibers, the amount of oil that can be absorbed by the oil absorber 34 is large. Therefore, it is possible to prevent the leakage of hydraulic oil from the hydraulic auto tensioner 1 over a long period of time.
  • the oil absorber 34 is fixed with the adhesive 35, the oil absorber 34 is effectively prevented from falling off due to vibration applied to the hydraulic auto tensioner 1 from the outside. It is possible.
  • FIG. 5 and 6 show a hydraulic auto tensioner 1 according to a second embodiment of the present invention. Portions corresponding to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
  • the hydraulic damper mechanism 15 includes a steel sleeve 40 fixed in the cylinder 11 so as to be in sliding contact with the outer periphery of the rod 12, a pressure chamber 21 formed inside the sleeve 40, and a sleeve.
  • the size of the leak gap 25 is very small, and is set in a range of 0.015 to 0.080 mm as a radial difference between the cylindrical surface on the outer periphery of the rod 12 and the cylindrical surface on the inner periphery of the sleeve 40.
  • the sleeve 40 is coaxially inserted into the cylinder 11, and the lower outer periphery of the sleeve 40 is press-fitted into a sleeve fitting recess 42 formed on the inner bottom surface 41 of the cylinder 11.
  • the oil passage 23 is formed between the fitting surface of the sleeve fitting recess 42 and the sleeve 40.
  • the check valve 24 is press-fitted into the lower end of the sleeve 40.
  • the return spring 14 is a cylindrical coil spring having an outer diameter smaller than the inner diameter of the cylinder 11 and is coaxially disposed on the inner diameter side of the cylinder 11.
  • the lower end of the return spring 14 is supported by the inner bottom surface 41 of the cylinder 11, and the upper end of the return spring 14 presses the spring seat 13 upward.
  • the spring seat 13 includes an end plate 43 that receives the upper end of the return spring 14, an upper connecting piece 8 provided so as to protrude upward from the end plate 43, and an end plate 43 that faces the inner diameter side of the cylinder 11. It has an inner cylindrical portion 44 that extends downward, and an outer cylindrical portion 45 that extends downward from the end plate 43 so as to face the outer diameter side of the cylinder 11.
  • An oil seal 16 is fitted with an allowance on the inner periphery of the upper end opening of the cylinder 11.
  • the oil seal 16 has a known configuration including a rubber lip that is slidably contacted with the outer periphery of the inner cylindrical portion 44 as the rod 12 moves, and an annular metal core that supports the lip.
  • An annular oil absorber 34 is fixed to the upper surface of the oil seal 16.
  • the oil absorber 34 is composed of a large number of fibers. Recycled fibers (rayon, acetate, etc.) and natural fibers (cotton, silk, hemp, wool, etc.) can be used as the fibers, but synthetic resin fibers are preferably used.
  • the oil absorber 34 is fixed to the upper surface of the oil seal 16 with an adhesive 35.
  • the hydraulic auto tensioner 1 also slides the oil seal 16 from the inside of the cylinder 11 when a working oil scraping action occurs at the sliding contact portion of the oil seal 16 as the rod 12 moves.
  • the hydraulic oil that oozes upward through the contact portion (the contact portion between the oil seal 16 and the inner cylindrical portion 44) is absorbed by the oil absorber 34 on the upper side of the oil seal 16. Therefore, even when the hydraulic auto tensioner 1 is used over a long period of time, it is possible to prevent the leakage of hydraulic oil from the hydraulic auto tensioner 1.
  • Other effects are the same as those of the first embodiment.

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

Abstract

Auto-tendeur hydraulique (1) comprenant une tige (12) introduite dans un cylindre (11) de manière à pouvoir se déplacer verticalement, un ressort de rappel (14) qui sollicite la tige (12) vers le haut, un mécanisme d'amortisseur hydraulique (15) qui utilise un fluide hydraulique à l'intérieur du cylindre (11) pour amortir une force descendante chargée sur la tige (12), et un joint d'huile annulaire (16) fixé à la périphérie intérieure d'une ouverture d'extrémité supérieure dans le cylindre (11) de façon à coulisser contre la périphérie intérieure avec le déplacement de la tige (12), le côté supérieur du joint d'huile (16) étant pourvu d'un absorbeur d'huile (34) pour absorber un fluide hydraulique qui a suinté vers le haut hors de l'intérieur du cylindre (11) à travers la partie coulissante du joint d'huile (16).
PCT/JP2018/009437 2017-03-17 2018-03-12 Auto-tendeur hydraulique WO2018168745A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-052782 2017-03-17
JP2017052782A JP2018155326A (ja) 2017-03-17 2017-03-17 油圧式オートテンショナ

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WO2018168745A1 true WO2018168745A1 (fr) 2018-09-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109185408A (zh) * 2018-10-18 2019-01-11 盖茨优霓塔传动系统（上海）有限公司 一种液压杆及具有该液压杆的液压张紧器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59168051U (ja) * 1983-04-26 1984-11-10 株式会社椿本チエイン 歯付ベルト用テンシヨナ
JPH0182371U (fr) * 1987-11-25 1989-06-01
JPH0852832A (ja) * 1994-08-12 1996-02-27 Mitsubishi Paper Mills Ltd 吸油材
JP2009222215A (ja) * 2008-03-19 2009-10-01 Sugatsune Ind Co Ltd 流体ダンパー

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59168051U (ja) * 1983-04-26 1984-11-10 株式会社椿本チエイン 歯付ベルト用テンシヨナ
JPH0182371U (fr) * 1987-11-25 1989-06-01
JPH0852832A (ja) * 1994-08-12 1996-02-27 Mitsubishi Paper Mills Ltd 吸油材
JP2009222215A (ja) * 2008-03-19 2009-10-01 Sugatsune Ind Co Ltd 流体ダンパー

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109185408A (zh) * 2018-10-18 2019-01-11 盖茨优霓塔传动系统（上海）有限公司 一种液压杆及具有该液压杆的液压张紧器
CN109185408B (zh) * 2018-10-18 2023-09-29 盖茨优霓塔传动系统（上海）有限公司 一种液压杆及具有该液压杆的液压张紧器

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