DE202007007690U1 - Clamping device with damping end stop - Google Patents

Clamping device with damping end stop

Info

Publication number
DE202007007690U1
DE202007007690U1 DE200720007690 DE202007007690U DE202007007690U1 DE 202007007690 U1 DE202007007690 U1 DE 202007007690U1 DE 200720007690 DE200720007690 DE 200720007690 DE 202007007690 U DE202007007690 U DE 202007007690U DE 202007007690 U1 DE202007007690 U1 DE 202007007690U1
Authority
DE
Germany
Prior art keywords
end stop
clamping device
damping end
characterized
housing
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 - Lifetime
Application number
DE200720007690
Other languages
German (de)
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.)
Iwis Motorsystem GmbH and Co KG
Original Assignee
Iwis Motorsystem GmbH 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
Application filed by Iwis Motorsystem GmbH and Co KG filed Critical Iwis Motorsystem GmbH and Co KG
Priority to DE200720007690 priority Critical patent/DE202007007690U1/en
Publication of DE202007007690U1 publication Critical patent/DE202007007690U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F16H7/0829Means for varying tension of belts, ropes, or chains with vibration damping means
    • F16H7/0836Means for varying tension of belts, ropes, or chains 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

Abstract

jig (1) for Endlostriebe, in particular chain drive an internal combustion engine, with a housing (2), one in the housing (2) along movably guided clamping piston (5), one between housing (2) and clamping piston (5) formed pressure chamber (11) for receiving a Hydraulic fluid and a damping end stop (18), wherein the tensioning piston (5) has a stop surface (24), the with the damping end stop (18) to the muted Stopping the retraction movement of the clamping piston (5) can be brought to stop characterized in that the damping end stop (18) is arranged in the pressure chamber.

Description

  • The The present invention relates to a tensioning device for Endless drives, in particular chain drives of an internal combustion engine, with a housing, one in the housing along movably guided clamping piston, one between housing and piston formed pressure chamber for receiving a hydraulic fluid and a damping stop.
  • Such a tensioning device is from the WO 2006 / 045406A1 known. Such hydraulic clamping systems usually work with a leakage gap between the housing receiving bore and the clamping piston in order to obtain a damping in the clamping system. When the internal combustion engine is at rest there is a pressure reduction in the pressure chamber of the tensioning device, since hydraulic fluid escapes via the leakage gap. When starting the internal combustion engine, it may then lead to the development of sufficient pressure in the pressure chamber to noise because the Endlostrieb is not sufficiently stretched. In chain drives the clamping piston of the clamping device usually presses against a pivotally mounted clamping rail, which in turn presses against the chain. In most cases, there is also a compression spring in the pressure chamber, which is in contact with the tensioning piston over the entire tensioning travel. Unless sufficient hydraulic fluid with sufficient pressure is present in the pressure chamber during the starting process, it may come to striking the tensioning rail or due to lack of damping effect to increased noise. For this purpose, an elastic end stop is provided in the known tensioning device. This is configured as a sleeve with frusto-conical end and is seated on the end face of the housing. The tensioning piston extends through the elastic end stop. If insufficient pressure is available in the pressure chamber during start-up, the tensioning rail can hit this end stop and buffer the movement of the tensioning rail. However, these designs require longer clamping devices with longer clamping pistons. In addition, the clamping rail must be matched to the clamping device, so that it can rest on the end stop.
  • It Now is the object of the present invention, a clamping device to provide the type mentioned, the possible little constructive changes in terms of common Require jig designs without limit stop.
  • For this is inventively provided that the tensioning piston has a stop surface with the damping end stop for damped stopping of the retraction movement of the clamping piston can be brought to a stop. The invention is therefore a different one Path. It will not be the tensioning rail opposite the housing the tensioning device stopped in their movement, but the tensioning piston even drives on a damping end stop, which pretends its retracted end position. This will additionally achieved that in highly dynamic systems, the Aufdrückfläche the tensioning piston does not lift off the tensioning rail, for example but remains in permanent contact. A striking of the tensioning piston At the bottom of the housing has always been by a particularly strong Pressure spring inside the pressure chamber prevented. The compression spring provides but no damping stop as it over the entire travel with the tensioning piston in contact stands. As a second possible solution are numerous Design variants are known in which attempts are made to fill the oil to get in the pressure room. Also locking devices are known which limit the retraction movement of the piston and wear out of the Adjust chain drive from detent to detent. These constructions are extremely complicated and therefore expensive. About that In addition, the Einfahrendposition changes constantly and a muted strike is not provided. Of the Tensioning piston of the tensioning device according to the invention therefore has a fixed or fixed end position of the retraction movement on, which remains the same over the entire service life.
  • Also known are special designs that use additional damping devices. As an example, here is the DE 44 43 095 A1 called. However, such a construction does not serve to dampen the retraction movement of the tensioning piston, but to reduce high-frequency vibrations in the damping system.
  • A particularly simple variant is that the damping end stop is arranged in the pressure chamber. For all common clamping devices is due to the compression spring always a certain distance between the clamping piston and the bottom of a receiving bore in the housing available. This existing space can be used to attach the damping end stop be used. But that also means that conventional Clamping equipment retrofitted or simple can be converted without being otherwise must change the design. It can therefore be existing Parts are used. The damping end stop should then consist of suitable materials that meet the requirements grown in the pressure chamber and exposure to the hydraulic fluid are.
  • Conveniently, for this purpose, the housing have a receiving bore for the clamping piston and the Dämpfungsendanschlag at a stage be arranged in the receiving bore. As a step here also simply the reason of the receiving bore can be used, in the mostly opens the inlet opening for the hydraulic fluid.
  • In order to Even with the tensioning piston already common parts without redesign can be used, the stop surface from the housing end surface of the Tensioning piston be formed. Accordingly, the damping end stop is preferred arranged at the bottom of the receiving bore and the end face The tensioning piston can then be supported on this. It is therefore no longer absolutely necessary, an oversized Use compression spring, which is a striking between housing and to prevent tensioning piston.
  • at A further embodiment provides that a Pressure chamber inlet for the inflow of hydraulic fluid present is, which extends through the damping end stop. Especially with Einschraubkettenspannern the supply takes place with hydraulic fluid usually centrally over the base area the receiving bore. In this variant, this can continue, because the damping end stop the pressure chamber inlet annular surrounds.
  • Provided the damping end stop is designed as a ring element, can in a further variant in the opening at least a portion of a check valve disposed in the pressure chamber inlet be arranged. This results in a space-saving overall structure. Due to the mostly hollow design of the clamping piston whose end face Also do not drive on the check valve, so that the damping function by the damping end stop and the inflow function through the check valve be provided in the same length section.
  • Of Further, a compression spring may be arranged in the pressure chamber, the between housing and the clamping piston acts and the with the housing facing end on the Dämpfungsendabschlag supported. The compression spring therefore also serves for fixation the damping end stop, so that this to the bottom the receiving hole is pressed. In a simplified Variant, the compression spring, however, at the bottom of the mounting hole support while the damping end stop surrounds the end of the compression spring.
  • at In another embodiment, the damping end stop is seated on a flange portion of the check valve, wherein the check valve in its position in another Stage is secured in the receiving bore thereby. The damping end stop accordingly holds the check valve in its receiving stage. It is particularly favorable if the damping end stop again pressed by the compression spring in its position becomes. The compression spring thus secures the damping end stop and the check valve.
  • conveniently, can the damping end stop of at least one elastic Ring element be formed. Here are suitable elastic bases or rubber materials are used, but also suitable Spring elements made of harder materials can find application here.
  • A Variant provides that an elastic ring element of a plate spring is formed. Here can z. B. an entire plate spring package can be used.
  • In the following an embodiment of the present invention will be explained in more detail with reference to a drawing. The only figure shows:
    a Einschraubkettenspanner with damping end stop in full cut.
  • The chain tensioner shown in the figure 1 has a screw-in 2 with a threaded section 3 and a screw-in 4 as well as in the screw-in housing 2 slidably guided tensioning piston 5 on. For holding the tensioning piston 5 is the screw-in housing 2 with a receiving hole 6 Mistake. The tensioning piston 5 and the mounting hole 6 have a slight play on each other, so that however there is a leakage gap, located in the front area to the annular gap 7 extended. For this purpose, the tensioning piston is in the front section 5 reduced in diameter, but increases again to Aufdrückkopf 8th with the impression surface 9 out.
  • The tensioning piston 5 is designed as a hollow body and has at its Aufdrückkopf 8th a vent 10 on. Between the tensioning piston 5 and the screw-in housing 2 is a pressure room 11 formed, which also partially into the interior of the tensioning piston 5 extends. Inside the tensioning piston 5 is a compression spring 12 placed a mushroom-shaped packing 13 presses against the inner end of the tensioning piston. The filler 13 is made of plastic and has its mushroom head 14 a vent groove 15 on. The compression spring 12 rests on the underside of the mushroom head 14 and pushes it against the tensioning piston 5 ,
  • At the bottom of the pressure chamber 11 is the receiving hole 6 double stepped. The first level becomes of the reason 16 the receiving bore 6 formed, in turn, the second stage 17 is provided. On the ground 16 the receiving bore 6 sits a schematically illustrated damping end stop 18 up, from the compression spring 12 is pressed into its position.
  • In the second stage 17 sits a commercial check valve 19 whose valve cage is partially in the opening 20 of the annular damping end stop 18 extends. The opening direction of the check valve 19 is chosen so that hydraulic fluid in the pressure chamber 11 can flow in. The check valve 19 is preceded by an inlet opening 21 with cross hole 22 , These holes 21 and 22 and the check valve 19 together form the pressure chamber inlet.
  • Below the screw-in head 4 of the screw-in housing 2 there is a sealing ring 23 ,
  • The damping end stop 18 may be a ring member made of an elastic material. It is also possible to use a plate spring or a plate spring package here. The lower end face 24 of the tensioning piston 5 serves as a stop surface on the damping end stop 18 runs.
  • The following is the operation and operation of the chain tensioner described above 1 explained in more detail.
  • The chain tensioner 1 is screwed at a suitable location in the engine block of an internal combustion engine (not shown) until the sealing ring 23 comes to the plant. In this position is the cross hole 22 automatically with the engine oil hydraulics. When starting, therefore, engine oil flows through the transverse bore 22 and the inlet hole 21 through the check valve 19 in the pressure room 11 , The tensioning piston 5 is extended and pushes with his impression surface 9 against a tensioning rail (not shown). During this starting process is the damping effect of the chain tensioner 1 not yet fully given. In addition, prevails in the pressure room 11 still no sufficient fluid pressure. Due to vibrations in the chain drive, the tensioning piston 5 retract further than desired. The damping end stop 18 ensures that the impact of the face 24 on the screw-in housing 2 not too hard. In particular, during the starting process of an internal combustion engine, it is thus possible to prevent or at least minimize rattling or overall noise generation. In operation, with sufficient pressure in the pressure chamber 11 , the damping stop will become 18 no longer needed, as the tensioning piston 5 is sufficiently extended. The Spannkolbenweg is determined so that in normal operation, a sufficient distance of the end face 24 to the damping end stop 18 remains. Even when the internal combustion engine is switched off, the hydraulic pressure only slowly breaks down through the leakage gap. In addition, the force of the compression spring 12 chosen so that it does not lead to an impact on the damping end stop 18 comes. To be damped mainly vibrations that may occur during the starting process of the internal combustion engine. For the design in operation the damping end stop plays 18 therefore a minor role, as this can only be used in a specific operating condition. As a result, as far as possible a separation of functions between chain tensioner design or tensioner position and the starting flapper problem is achieved.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • - WO 2006/045406 A1 [0002]
    • - DE 4443095 A1 [0005]

Claims (9)

  1. Clamping device ( 1 ) for endless drives, in particular chain drive of an internal combustion engine, with a housing ( 2 ), one in the housing ( 2 ) longitudinally movably guided clamping piston ( 5 ), between an enclosure ( 2 ) and tensioning piston ( 5 ) pressure space ( 11 ) for receiving a hydraulic fluid and a damping end stop ( 18 ), wherein the tensioning piston ( 5 ) a stop surface ( 24 ) with the damping end stop ( 18 ) for damped stopping of the retraction movement of the tensioning piston ( 5 ) can be brought to a stop, characterized in that the damping end stop ( 18 ) is arranged in the pressure chamber.
  2. Clamping device ( 1 ) according to claim 1, characterized in that the housing ( 2 ) a receiving bore ( 6 ) for the tensioning piston ( 5 ) and the damping end stop ( 18 ) at a stage ( 16 ) in the receiving bore ( 6 ) is arranged.
  3. Clamping device ( 1 ) according to claim 1 or 2, characterized in that the stop surface ( 24 ) of the in the housing ( 2 ) arranged end face of the tensioning piston ( 5 ) is formed.
  4. Clamping device ( 1 ) according to one of the preceding claims, characterized in that a pressure chamber inlet for the inflow of hydraulic fluid is provided, which extends through the damping end stop ( 18 ).
  5. Clamping device ( 1 ) according to claim 4, characterized in that the damping end stop ( 18 ) is designed as a ring element, in whose opening ( 20 ) at least a portion of a pressure chamber inlet arranged in the check valve ( 19 ) is arranged.
  6. Clamping device ( 1 ) according to one of claims 1 to 5, characterized in that in the pressure chamber ( 11 ) a compression spring ( 12 ) arranged between housings ( 2 ) and the tensioning piston ( 5 ) and that interacts with her and the case ( 2 ) end on the damping end stop ( 18 ) is supported.
  7. Clamping device ( 1 ) according to one of claims 5 or 6, characterized in that the damping end stop ( 18 ) on a flange portion of the return check valve ( 19 ) and the check valve ( 19 ) in its position in a further stage ( 17 ) in the receiving bore ( 16 ) is thereby secured.
  8. Clamping device ( 1 ) according to one of the preceding claims, characterized in that the damping end stop ( 18 ) is formed by at least one elastic ring member.
  9. Clamping device ( 1 ) according to claim 8, characterized in that an elastic ring element is formed by a plate spring.
DE200720007690 2007-05-31 2007-05-31 Clamping device with damping end stop Expired - Lifetime DE202007007690U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200720007690 DE202007007690U1 (en) 2007-05-31 2007-05-31 Clamping device with damping end stop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200720007690 DE202007007690U1 (en) 2007-05-31 2007-05-31 Clamping device with damping end stop

Publications (1)

Publication Number Publication Date
DE202007007690U1 true DE202007007690U1 (en) 2008-10-09

Family

ID=38721790

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200720007690 Expired - Lifetime DE202007007690U1 (en) 2007-05-31 2007-05-31 Clamping device with damping end stop

Country Status (1)

Country Link
DE (1) DE202007007690U1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009020755A1 (en) * 2009-04-29 2010-11-04 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Tensioning device used as a hydraulic chain and/or belt adjuster in an engine comprises a damping element acting with a piston unit and arranged within a holding region
DE102011078576A1 (en) 2011-07-04 2013-01-10 Schaeffler Technologies AG & Co. KG Chain tensioner, particularly hydraulic chain tensioner for internal combustion engine of vehicle, comprises housing with borehole, and tensioning piston with cavity received in borehole, where tensioning piston has ventilation opening
DE102013200263A1 (en) * 2013-01-10 2014-07-10 Schaeffler Technologies Gmbh & Co. Kg Volume reducer of a hydraulic tensioner
DE202015008539U1 (en) * 2015-12-14 2017-03-16 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Clamping device for endless drive element of an internal combustion engine
DE102016204178A1 (en) * 2016-03-15 2017-09-21 Schaeffler Technologies AG & Co. KG Zugmittelspanner with stop

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4443095A1 (en) 1994-12-03 1996-06-13 Ford Werke Ag Chain tensioner / belt tensioner
WO2006045406A1 (en) 2004-10-26 2006-05-04 Schaeffler Kg Hydraulic tensioning system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4443095A1 (en) 1994-12-03 1996-06-13 Ford Werke Ag Chain tensioner / belt tensioner
WO2006045406A1 (en) 2004-10-26 2006-05-04 Schaeffler Kg Hydraulic tensioning system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009020755A1 (en) * 2009-04-29 2010-11-04 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Tensioning device used as a hydraulic chain and/or belt adjuster in an engine comprises a damping element acting with a piston unit and arranged within a holding region
DE102011078576A1 (en) 2011-07-04 2013-01-10 Schaeffler Technologies AG & Co. KG Chain tensioner, particularly hydraulic chain tensioner for internal combustion engine of vehicle, comprises housing with borehole, and tensioning piston with cavity received in borehole, where tensioning piston has ventilation opening
DE102013200263A1 (en) * 2013-01-10 2014-07-10 Schaeffler Technologies Gmbh & Co. Kg Volume reducer of a hydraulic tensioner
DE202015008539U1 (en) * 2015-12-14 2017-03-16 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Clamping device for endless drive element of an internal combustion engine
DE102016204178A1 (en) * 2016-03-15 2017-09-21 Schaeffler Technologies AG & Co. KG Zugmittelspanner with stop

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Legal Events

Date Code Title Description
R207 Utility model specification

Effective date: 20081113

R150 Term of protection extended to 6 years

Effective date: 20100713

R151 Term of protection extended to 8 years
R151 Term of protection extended to 8 years

Effective date: 20130610

R152 Term of protection extended to 10 years
R071 Expiry of right