DE19743480B4 - Mechanical-hydraulic actuator for a belt tensioner - Google Patents

Mechanical-hydraulic actuator for a belt tensioner

Info

Publication number
DE19743480B4
DE19743480B4 DE1997143480 DE19743480A DE19743480B4 DE 19743480 B4 DE19743480 B4 DE 19743480B4 DE 1997143480 DE1997143480 DE 1997143480 DE 19743480 A DE19743480 A DE 19743480A DE 19743480 B4 DE19743480 B4 DE 19743480B4
Authority
DE
Germany
Prior art keywords
piston
cylinder
oil reservoir
housing
compression spring
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 - Fee Related
Application number
DE1997143480
Other languages
German (de)
Other versions
DE19743480A1 (en
Inventor
Eduard Kratz
Werner Dipl.-Ing. Petri (FH)
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 to DE19645122 priority Critical
Priority to DE19645122.1 priority
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to DE1997143480 priority patent/DE19743480B4/en
Publication of DE19743480A1 publication Critical patent/DE19743480A1/en
Application granted granted Critical
Publication of DE19743480B4 publication Critical patent/DE19743480B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H7/10Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1209Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means
    • F16H7/1236Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means of the fluid and restriction type, e.g. dashpot
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H2007/0802Actuators for final output members
    • F16H2007/0806Compression coil springs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H7/0848Means for varying tension of belts, ropes, or chains with means for impeding reverse motion
    • F16H2007/0859Check valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H2007/0863Finally actuated members, e.g. constructional details thereof
    • F16H2007/0865Pulleys
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H2007/0889Path of movement of the finally actuated member
    • F16H2007/0893Circular path

Abstract

Mechanical-hydraulic actuating element (23) for a belt tensioner, in particular for internal combustion engines, having a cylinder (24) and a piston (25) guided in this manner, which are supported relative to one another via a compression spring (34), and with one inside the cylinder (24) arranged on a front side by the piston (25) limited pressure chamber (26) which is separated from a cylinder (24) surrounding the annular oil reservoir (28) by a check valve (29), wherein the check valve (29) a Oil passage from the oil reservoir (28) in the pressure chamber (26) allows, while an annular gap between the piston (25) and cylinder (24) is dimensioned so that by him under pressure against the force of the compression spring (34) oil from the pressure chamber (26 ) in the oil reservoir (28), and wherein the oil reservoir (28) to the outside of a hollow cylindrical, connected to the cylinder housing (27) is limited and frontally by a e between an inner peripheral surface of the housing (27) and an outer circumferential surface of the piston (25) arranged on the piston ...

Description

  • Field of application of the invention
  • The invention relates to a mechanical-hydraulic actuating element for a belt tensioner, in particular for internal combustion engines, with a cylinder and a slidingly guided in this piston, which are supported by a compression spring to each other, and arranged with an inside of the cylinder, on an end side by the piston limited pressure space, which is separated from a cylinder surrounding the annular oil reservoir by a check valve, wherein the check valve allows oil to pass from the oil reservoir into the pressure chamber, while an annular gap between the piston and cylinder is dimensioned so that by him under pressure against the force of the compression spring Oil can pass from the pressure chamber in the oil reservoir, and wherein the oil reservoir is limited as outwardly by a hollow cylindrical, connected to the cylinder cup-shaped housing. Appropriately designed belt tensioner with mechanical-hydraulic actuators are provided to maintain a constant belt tension with the corresponding oil hydraulic compensation device and are preferably used for belt tensioners within aggregates of internal combustion engines.
  • Background of the invention
  • A corresponding mechanical-hydraulic actuator for a belt tensioner is from the US 4 790 801 A known. An annular oil reservoir, which surrounds the cylinder or the piston is thereby limited in accordance with the preamble of the present invention to the outside by two cup-shaped housing. The one cup-shaped housing is connected to the cylinder, while the second cup-shaped housing emanates from the component containing the piston. Both cup-shaped housing are telescopically slidable, between them a Rollbalgdichtung is arranged so that the oil can not escape from the oil reservoir. Such a seal on a Rollbalgdichtung has proven to be very reliable, but it allows only a limited movement of the two housing to each other and u. U. lead to an increase in the axial length of the entire actuator.
  • Another mechanical-hydraulic actuator shows the JP 08-074 956 A in which a compression spring surrounds a piston-cylinder unit on the outside. To form an oil reservoir, a central bore is introduced in the piston, which continues in a connecting section between the piston and a fastening eye. In this case, the oil reservoir is separated by a bottom side integrated in the piston check valve of the pressure chamber. In an adjusting movement of the piston against a force direction of the compression spring, a subset of the hydraulic oil is displaced via an annular gap between the piston and cylinder and radial openings in the connecting portion in the oil reservoir. An opposite piston movement causes an opening of the check valve as soon as a pressure which is reduced in relation to the reservoir is established within the pressure chamber. For sealing the piston-cylinder unit, a seal is provided at the end of the cylinder, which is supported on an outer circumferential surface of the piston forming a structural unit connecting portion.
  • Summary of the invention
  • The invention has for its object to simplify the sealing of the annular oil reservoir.
  • According to the invention, this object is achieved in that the mechanical-hydraulic actuator comprises a cup-shaped housing which engages a component formed jointly with the cylinder. The cup-shaped housing is enclosed on the outside by the compression spring, which is inserted between a first cup-shaped housing associated spring seat and a second cylinder associated spring seat. For sealing a groove ring seal is used on an inner peripheral surface, in a groove open on one side of the housing, which is slidably supported on an outer circumferential surface of the piston.
  • Although a corresponding design of the actuating element is possibly associated with a reduction in the volume of the oil reservoir, but the result is a construction of the actuating element, in which the number of required components can be reduced. In addition, the U-ring seal allows large relative axial movements of the piston relative to the housing, so that a larger adjustment is feasible. With the U-ring seal, a low-cost component can be used, which may even be available as a catalog product. Advantageously, the U-ring seal is pressed into the housing and guided on an outer circumferential surface of the piston sliding and sealing.
  • For further explanation of the invention reference is made to the drawing, which illustrates an embodiment.
  • Brief description of the drawings
  • Show it:
  • 1 a view of a complete belt tensioner,
  • 2 a half section through an inventive actuator,
    in which between a cup-shaped housing and a
    Piston a U-ring seal is arranged.
  • Detailed description of the drawings
  • An Indian 1 illustrated belt tensioner has a support bracket 1 on, on the at a pivot bearing 2 a tension roller lever 3 is guided. This tension roller lever 3 takes on a rotation axis 4 a tension roller 5 put on a strap 6 acts. The on the tension roller 5 acting clamping force is by an actuator 7 generated, which on the one hand at a pivot point 8th mounted on the support bracket and on the other hand at a point of application 9 the tension roller lever 3 attacks. The actuator 7 should according to the following 2 be educated.
  • In the 2 is with 23 an actuating element, which has a created by simple means oil reservoir. The actuator 23 consists of a cylinder 24 and a piston slidingly guided therein 25 that have a pressure room 26 includes and with a fastening eye 14 connected is. The cylinder 24 and partly the piston 25 are of a cup-shaped housing 27 surrounded radially, opposite the cylinder 24 an annular oil reservoir 28 includes. With this annular oil reservoir 28 is the pressure room 26 via a check valve 29 in connection. At its opposite end of the check valve is the annular oil reservoir 28 through a U-ring seal 30 closed, this U-ring seal 30 in a groove 31 the cup-shaped housing 27 is inserted and attached to the piston 25 sealingly glides. In the piston is a flange 32 fastened, on the one hand a fastening eye 13 and on the other hand a spring pad 33 for a compression spring 34 forms. This pressure spring 34 comprising a hollow cylindrical portion of the cup-shaped housing 27 radially surrounds, lies on another spring support 35 the cup-shaped housing 27 at. By means of the illustrated arrangement of the U-ring seal 30 can be easily the oil reservoir 28 caulk.
  • LIST OF REFERENCE NUMBERS
  • 1
    support bracket
    2
    pivot bearing
    3
    Tensioner lever
    4
    axis of rotation
    5
    idler
    6
    belt
    7
    actuator
    8th
    pivot point
    9
    attackpoint
    13
    fastening eye
    14
    fastening eye
    23
    actuator
    24
    cylinder
    25
    piston
    26
    pressure chamber
    27
    cup-shaped housing
    28
    annular oil reservoir
    29
    check valve
    30
    groove ring seal
    31
    groove
    32
    flange
    33
    spring Plate
    34
    compression spring
    35
    spring Plate

Claims (1)

  1. Mechanical-hydraulic actuator ( 23 ) for a belt tensioner, in particular for internal combustion engines, with a cylinder ( 24 ) and in this sliding guided piston ( 25 ), which are connected to each other via a compression spring ( 34 ) and with one inside the cylinder ( 24 ) arranged on an end face by the piston ( 25 ) limited pressure space ( 26 ), which of a cylinder ( 24 ) surrounding annular oil reservoir ( 28 ) by a check valve ( 29 ), the check valve ( 29 ) an oil transfer from the oil reservoir ( 28 ) into the pressure chamber ( 26 ) while allowing an annular gap between pistons ( 25 ) and cylinders ( 24 ) is dimensioned so that by him under pressure against the force of the compression spring ( 34 ) Oil from the pressure chamber ( 26 ) into the oil reservoir ( 28 ), and wherein the oil reservoir ( 28 ) to the outside of a hollow cylindrical, with the cylinder connected housing ( 27 ) is limited and frontally by a between an inner peripheral surface of the housing ( 27 ) and an outer circumferential surface of the piston ( 25 ), sliding on the piston U-ring seal ( 30 ) sealed in a one-sided open groove ( 31 ) of the housing ( 27 ), wherein the housing ( 27 ) is cup-shaped and the compression spring ( 34 ) a hollow cylindrical portion of the cup-shaped housing ( 27 ) surrounds radially and on the one hand at one of the cup-shaped housing ( 27 ) from radially outwardly facing spring support ( 35 ) as well as on the other hand another spring support ( 33 ), which are removed from the cylinder ( 24 ) protruding end of the piston ( 25 ) is directly supported.
DE1997143480 1996-11-04 1997-10-01 Mechanical-hydraulic actuator for a belt tensioner Expired - Fee Related DE19743480B4 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19645122 1996-11-04
DE19645122.1 1996-11-04
DE1997143480 DE19743480B4 (en) 1996-11-04 1997-10-01 Mechanical-hydraulic actuator for a belt tensioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1997143480 DE19743480B4 (en) 1996-11-04 1997-10-01 Mechanical-hydraulic actuator for a belt tensioner

Publications (2)

Publication Number Publication Date
DE19743480A1 DE19743480A1 (en) 1998-05-07
DE19743480B4 true DE19743480B4 (en) 2011-04-28

Family

ID=7810420

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1997143480 Expired - Fee Related DE19743480B4 (en) 1996-11-04 1997-10-01 Mechanical-hydraulic actuator for a belt tensioner

Country Status (1)

Country Link
DE (1) DE19743480B4 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19940963A1 (en) * 1999-08-28 2001-03-01 Bayerische Motoren Werke Ag Tensioning device for an enveloping drive, in particular a belt drive for auxiliary units on internal combustion engines
US6450907B1 (en) * 2001-03-12 2002-09-17 The Gates Corporation Inner race idler pulley tensioner
DE10327214A1 (en) * 2003-06-17 2005-01-13 Ina-Schaeffler Kg Spring tensioning and damping system for belt drive for accessory in internal combustion engine has chamber with restricted access for oil, acting as damping chamber
DE102004047450A1 (en) * 2004-09-30 2006-04-06 Ina-Schaeffler Kg Hydraulic tensioning element
DE102005031593A1 (en) 2005-07-06 2007-01-11 Schaeffler Kg Seal for the bearing eye of a clamping system
DE102007036442A1 (en) 2007-08-02 2009-02-05 Schaeffler Kg Method for producing a sliding bearing in a cast component, which is preferably designed as a tension lever of a belt tensioner and cast component itself

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4790801A (en) * 1988-04-04 1988-12-13 Ina Walzlager Schaeffler Kg Mechanic-hydraulic actuating element for a belt tightener
DE3741860A1 (en) * 1987-12-10 1989-06-22 Schaeffler Waelzlager Kg Tension device for a belt
US5107970A (en) * 1991-04-17 1992-04-28 Monroe Auto Equipment Company High pressure sealing system and method
DE4124500A1 (en) * 1991-07-24 1993-01-28 Kugelfischer G Schaefer & Co Hydraulically damped tension element - has reaction face on cylinder bush to avoid extra safety pressure valve
JPH05321994A (en) * 1992-05-25 1993-12-07 Aisin Seiki Co Ltd Auto-tensioner
JPH0874956A (en) * 1994-08-31 1996-03-19 Aisin Seiki Co Ltd Automatic tensioner
JPH08145130A (en) * 1994-11-25 1996-06-04 Toyota Motor Corp Tensioner

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3741860A1 (en) * 1987-12-10 1989-06-22 Schaeffler Waelzlager Kg Tension device for a belt
US4790801A (en) * 1988-04-04 1988-12-13 Ina Walzlager Schaeffler Kg Mechanic-hydraulic actuating element for a belt tightener
US5107970A (en) * 1991-04-17 1992-04-28 Monroe Auto Equipment Company High pressure sealing system and method
DE4124500A1 (en) * 1991-07-24 1993-01-28 Kugelfischer G Schaefer & Co Hydraulically damped tension element - has reaction face on cylinder bush to avoid extra safety pressure valve
JPH05321994A (en) * 1992-05-25 1993-12-07 Aisin Seiki Co Ltd Auto-tensioner
JPH0874956A (en) * 1994-08-31 1996-03-19 Aisin Seiki Co Ltd Automatic tensioner
JPH08145130A (en) * 1994-11-25 1996-06-04 Toyota Motor Corp Tensioner

Also Published As

Publication number Publication date
DE19743480A1 (en) 1998-05-07

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Legal Events

Date Code Title Description
8127 New person/name/address of the applicant

Owner name: INA-SCHAEFFLER KG, 91074 HERZOGENAURACH, DE

8110 Request for examination paragraph 44
8127 New person/name/address of the applicant

Owner name: SCHAEFFLER KG, 91074 HERZOGENAURACH, DE

8127 New person/name/address of the applicant

Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 H, DE

R020 Patent grant now final

Effective date: 20110729

R081 Change of applicant/patentee

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, DE

Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 HERZOGENAURACH, DE

Effective date: 20120828

Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, DE

Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 HERZOGENAURACH, DE

Effective date: 20120828

R081 Change of applicant/patentee

Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, DE

Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES AG & CO. KG, 91074 HERZOGENAURACH, DE

Effective date: 20140218

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, DE

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R081 Change of applicant/patentee

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Effective date: 20150210

R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee