DE102016204178A1 - Zugmittelspanner with stop - Google Patents

Abstract

The invention relates to a traction mechanism tensioner (1) for pretensioning an endless traction device of an internal combustion engine, comprising a base part (2), a tensioning part (3) which is displaceable relative to the base part (2) and one between the base part (2) and the tensioning part (2). 3) clamped spring (4) for applying the biasing force, wherein the Zugmittelspanner (1) has a clamping force of the spring (4) upwardly limiting stop (5) with a first stop part (5a) on the base part (2) and a second stop member ( 5b) on the clamping part (3), wherein the stop parts (5a, 5b) are arranged so that in the stop case, the length of the spring (4) is greater than the block length. The invention also relates to a traction mechanism drive with this Zugmittelspanner (1).

Description

The invention relates to a Zugmittelspanner, preferably a hydraulic Zugmittelspanner, for biasing a endless traction means, such as a belt or a chain, an internal combustion engine, such as a gasoline or diesel engine, a motor vehicle, such as a car, truck, bus, agricultural utility vehicle or motorcycle, with a base part, a clamping part, which is displaceable relative to the base part, and a clamped between the base part and the clamping part spring for applying the biasing force. Furthermore, the invention relates to a traction mechanism drive, preferably a chain or belt drive, for a motor vehicle with such Zugmittelspanner.

From the state of the art, mechanical and hydraulic traction mechanism tensioners are already known in various designs. In this context, for example, discloses the WO 2009/074 566 A1 , the content of the EP 2 217 831 A1 corresponds, a mechanical spring element for traction drives. The spring element consists of a cylinder in which a piston is guided linearly displaceable and is subjected to force by a spring means, wherein for attachment of the spring element of the cylinder and the piston coincidentally each have a fastening eye. To limit the stroke of the spring means engages a piston associated transverse pin form fit in a longitudinal guide of the cylinder.

Further prior art is known from US 4 790 801 A , of the US 2013/0 260 931 A1 , of the US 2014/0 057 748 A1 , of the EP 2 101 082 A2 as well as the DE 10 2011 088 214 A1 known.

As a disadvantage, it has been found that the springs known Zugmittelspanner are not sufficiently protected by the existing attacks from mechanical overloading. In particular, the attacks known Zugmittelspanner not matched to the block length of the respective spring, whereby the spring can easily go to block and depending on the applied forces on the clamping or the base part can even be plastically deformed. In certain conditions, a lateral sliding of the spring is possible, whereby even the individual components of Zugmittelspanners can take damage.

It is therefore the object of the present invention to remedy these disadvantages known from the prior art and to provide a Zugmittelspanner whose spring is to be protected against mechanical overload.

This is inventively achieved in that the Zugmittelspanner comprises a clamping force of the spring upwardly limiting stop with a first stop member on the base part and a second stop member on the clamping part, wherein the stop members are arranged so that the stop length, the spring is greater than their block length. The stop is thus arranged so that in a compression position of the Zugmittelspanners go to block the coil spring is prevented.

As a result, the stopper is effectively used to avoid overloading the spring. The spring, even if it is maximally compressed, is not fully compressed in the compression position of the traction mechanism tensioner (down to block) and still has a further compression length / length in the axial direction. Thus, an unwanted plastic deformation of the spring is avoided.

Further advantageous embodiments are claimed in the subclaims and explained in more detail below.

If the first abutment part / part of a housing portion of a valve disposed in the base check valve, the stop is particularly space-saving in the then preferably designed as a hydraulic Zugmittelspanner Zugmittelspanner introduced.

In this context, it is particularly advantageous if the housing portion is a, a closing body of the check valve umhausende stop cap / forms. As a result, the check valve can largely remain in the previous compact form.

It is expedient here too if the housing region has an end face facing the clamping part, which serves as a stop surface for an end face of the clamping part which forms the second stop part. As a result, the clamping part is supported particularly directly by the check valve.

If at the clamping part facing the front side of the housing portion a (the first stop member ausbildender) stop buffer is attached, the impact energy can be cleverly cleverly derived over a large area. As a result, the check valve is also designed to be particularly durable.

Furthermore, it is advantageous if the first stop member by a housing fixed portion of the base part, i. by a housing of the base part, which surrounds the clamping part, is formed. As a result, the impact energy is transmitted directly to the housing, whereby the load on the check valve is further reduced.

In this context, it is particularly expedient if the first stop part is formed by a conical, annular inner surface on a housing of the base part, wherein the clamping part has on its front side a complementary formed to this inner surface contact edge, which provides the second stop member. When striking the clamping part on the base part, the clamping part is then centered relative to the base part, whereby the load on the guidance of the clamping part in the base part is largely reduced.

It is also advantageous to mold the second stop member by at least one first ring element, which is fixedly connected to the base part, wherein a second ring element which is attached by means of a spring receiving part to the clamping part, the second stop member provides. This makes it possible to move the stop in an area that is less space-consuming used. Thus, the Zugmittelspanner is even more cost-effective in its production.

If a buffer ring is arranged between the ring elements in this connection, the load on the ring elements is reduced further if the clamping part abuts against the base part.

In addition, the invention relates to a traction mechanism drive with such Zugmittelspanner, which allows a particularly efficient design of the traction mechanism.

The invention will now be described in more detail below with reference to figures, in which context also different embodiments are shown.

Show it:

1 a longitudinal sectional view of a Zugmittelspanners according to the invention according to a first preferred embodiment, wherein the Zugmittelspanner is shown in a compression position in which a clamping part of the Zugmittelspanners abstützender stop is arranged on a check valve,

2 a detailed representation of the in 1 used check valve,

3 an isometric view of the check valve after 2 .

4 a longitudinal sectional view of a Zugmittelspanners according to the invention according to a second embodiment, wherein the stopper is disposed on an inner surface of a housing of a base part of Zugmittelspanners and cooperates with a complementary thereto formed abutment edge on the clamping part,

5 a longitudinal sectional view of a Zugmittelspanners according to a third preferred embodiment of the invention, in turn, the check valve provides a stop for the clamping part in the compression position, wherein the stop is made thicker compared to the first embodiment,

6 a cross-sectional view along the in 5 with "VI-VI" marked cut line, where particularly well the attachment of the check valve is visible in the base part,

7 a cross-sectional view similar to the 6 , wherein the representation of the stop is omitted,

8th a longitudinal sectional view of in 5 used check valve,

9 an isometric view of the check valve after 8th from an outside,

10 an isometric view of the check valve after 8th and 9 from a bottom, wherein the closing body of the check valve is clearly visible,

11 a longitudinal sectional view through a Zugmittelspanner according to the invention according to a fourth embodiment, wherein the stop on the part of the base is now configured by a ring member to which a turn arranged on the base member ring member in the compression position,

12 a detailed representation of the in 11 with "XII" marked area, with the attachment of the respective ring elements can be seen particularly well on the clamping and the base part,

13 a longitudinal sectional view through a Zugmittelspanner invention according to a fifth embodiment, wherein now, compared to the fourth embodiment, the ring member of the base part is fixed by means of a screw, and

14 a detailed representation of the in 13 marked with "XIV" area.

The figures are merely schematic in nature and are for the sole purpose of understanding the invention. The same elements are provided with the same reference numerals.

In 1 is first a first embodiment of a Zugmittelspanners invention 1 recognizable, the remaining second to fifth embodiments, as far as not further described, essentially as this Zugmittelspanner 1 of the first embodiment are functioning and constructed. Therefore, for the sake of brevity, only the differences from the first embodiment will be discussed below with reference to the second to fifth embodiments.

The tensioning device 1 According to the invention, it is designed as a hydraulic traction means tensioner, namely as a hydraulic belt tensioner. Its base part 2 forms, as in 1 to recognize, also referred to as a cylinder housing / housing housing fixed area 13 on. This housing-fixed area 13 is essentially cup-shaped / hat-shaped / cup-shaped. The housing-fixed area 13 is, as explained in more detail below, with a Federeinhüllungsbereich 20 further connected. The feather wrapping area 20 extends substantially in the axial direction in a region radially outside the housing fixed area 13 , The feather wrapping area 20 is fixed to the housing-fixed area / housing 13 connected. In particular, also serves the Federeinhüllungsbereich 20 again as a kind of housing / enclosure for wrapping the housing-fixed area 13 , The feather wrapping area 20 is preferably formed from an aluminum material.

In the base part 2 is a clamping part 3 in an axial direction of the Zugmittelspanners 1 , namely in the longitudinal direction of the housing fixed area 13 , slidably guided. The clamping part 3 has a piston area 21 on that with the base part 2 a hydraulic pressure chamber 22 includes. The pressure chamber 22 is again by means of a check valve 7 that in the base part 2 namely in the housing-fixed area 13 , is used hydraulically with a storage space 23 coupled, in which memory space 23 as well as in the pressure chamber pressurized fluid in operation is present. The storage space 23 is through a cavity radially between the housing fixed area 13 and the spring wrapping area 20 educated. The environment is the storage space 23 by means of an axially deformable, bellows-type seal 27 sealed. The seal 27 is preferably designed so that it gases, such as air, from the storage space 23 to the environment, whereas hydraulic fluid / fluids, such as oil, are prevented from exiting. This hydraulic system from storage space 23 , Pressure chamber 22 and check valve 7 is used in the usual way as a damping system for the movement of the clamping part 3 relative to the base part 2 during operation of the Zugmittelspanners 1 ,

Next to the piston area 21 has the clamping part 3 a spring receiving part 18 on, with the piston area 21 fixed, ie non-shifting, connected. The spring receiving part 18 is preferably made of an aluminum material. In the axial direction between the spring receiving part 18 and the spring wrapping area 20 is a spring 4 in the form of a coil spring 4 arranged with several spring coils, here nine in number. The spring receiving part 18 supports a first axial end portion of the coil spring 4 whereas a second end portion of the coil spring 4 again at the feather envelopment area 20 is supported.

base 2 and clamping part 3 are in turn typically each with a bearing eye 26 connected, which bearing eyes 26 used in operation for biasing a endless traction drive of an internal combustion engine, namely an accessory belt drive. That at the base part 2 trained bearing eye 26 is preferred in the operation of Zugmittelspanners 1 in a traction drive of an internal combustion engine internal combustion engine case fixed, such as on a front cover of the internal combustion engine, whereas that on the clamping part 3 trained bearing eye 26 is fixed to a tensioning arm of the traction mechanism, which tensioning arm in turn directly or indirectly biases an endless traction means of the traction mechanism drive. If the endless traction means, here a belt, under bias, it presses the two bearing eyes 26 towards each other, so that the Zugmittelspanner is compressed. If the endless traction agent relaxes again, the traction mechanism becomes tensioned 1 by the biasing force of the coil spring 4 back to its starting position / relaxed position.

In 1 is the Zugmittelspanner 1 in its compression position, ie a position in which the coil spring 4 is arranged in a predetermined, maximum compressed position shown. This compression position is inventively by a stop 5 determined / determined. The compression position represents that position of the piston area 21 within the housing-fixed area 13 in which the clamping part 3 is inserted as far as possible in the axial direction / in its retraction direction. The stop 5 prevents in all embodiments that the spring 4 in the compression position goes to block. Thus, the stop protects 5 the feather 4 that their spring coils contact in the compression position.

In the first embodiment, a first stopper part 5a of the stop 5 on a housing area 6 of in 2 easy to recognize check valve 7 educated. As here in Connection with the 2 and 3 is clearly visible, is the housing area 6 Cap-shaped and thus as a stop cap 9 designated. The stop cap 9 is radially outside of the closing body 8th , in the form of a ball, the check valve 7 receiving pickup cap 24 put on and attached. receiving cap 24 and stop cap 9 are manufactured here with the same thermoforming / stamping process. The first stop part 5a is again directly by means of a stop buffer 12 implemented. This bump stop 12 is preferably made of a plastic material, such as an elastomeric plastic material / elastomer. The stop buffer 12 is in a clamping part 3 / Piston area 21 facing end face 10 of the housing area 6 appropriate. The stop buffer 12 is here in the stop cap 9 / the housing area 6 Pressed / held by a press fit. The housing area 6 is preferably formed from a metal sheet.

A second stop part 5b of the stop 5 is here as a front page 11 of the clamping part 3 educated.

As continues in 3 The housing area is particularly easy to recognize 6 / the stop cap 9 as well as the recording cap 24 in the radial direction with a plurality of circumferentially distributed fluid passages 25 Mistake. As a result, the fluid flow is in an open position of the check valve 7 guaranteed.

In the context of the (third) embodiment, as related to the 5 to 10 It should be noted, in principle, that recording cap 24 and stop cap 9 also together from a single, thick-walled component, which then as a stop cap 9 is simply designated, can be configured. This stop cap 9 is then designed so massive that the front page 11 of the clamping part 3 / the piston area 21 directly on the front side 10 comes into abutment in the compression position. On an additional recording cap 24 is omitted. The stop cap 9 is then preferably formed as a forging. However, the stop cap can 9 be designed as a rotating part or casting. The stop cap 9 is in the housing fixed area 13 pressed.

As in this context, especially good in the 8th to 10 shown is also the stop cap 9 with several fluid passages 25 Mistake. In connection with 6 and 7 it can be seen that the fluid passages 25 in conjunction with corresponding connection channels in the housing fixed area 13 are tuned, so that a fluid flow between the pressure chamber 22 and the storage space 23 in an open state of the check valve 7 is guaranteed. The fluid passages 25 are in turn arranged offset in the circumferential direction by 120 ° to each other.

According to a second embodiment, which is in 4 However, it is also possible, the first stop part 5a of the stop 5 spaced from the check valve 7 to install. In this embodiment, an annular, designed as a shoulder inner surface 14 conically shaped. A complementary configured conical face 11 of the clamping part 3 forms the second stop part 5b in the form of a plant edge 15 out, which then in the compression position on the inner surface 14 is applied. At a compression of the pressure chamber 22 , ie an insertion of the clamping part 3 in the base part 2 , in the direction of the second stop part 5b , The gap, can flow through the hydraulic fluid, with increasing insertion movement of the clamping part 3 reduced. Once the piston area 21 on the inner surface 14 is applied, the damping force will increase significantly, due to the decreasing pressure chamber 22 ,

Furthermore, as in 11 To recognize, it is also possible in a fourth embodiment, a first ring / a first ring element 16 at the feather envelopment area 20 as first stop part 5a to install. This first ring element 16 can as in the embodiment of 11 and 12 by an interference fit in the spring wrap area 20 be included. The first ring element 16 is preferably a conical ring. In particular, a radial outer surface of the first ring element 16 , complementary to a radially inner surface of the Federeinhüllungsbereiches 20 , conically shaped. A second ring element 17 that the second stop part 5b is formed on the spring receiving part 18 arranged shift-proof. The second ring element 17 is radially outward on the spring receiving part 18 screwed. Axial between the two ring elements 16 and 17 is a buffer ring 19 present, which is also made of an elastomeric plastic material and thus the load peaks in an abutment of the clamping part 3 on the base part 2 significantly lower.

Alternatively, according to the fifth embodiment according to 13 and 14 , which is constructed similarly to the fourth embodiment, may be the first ring element 16 also by means of a thread on the Federeinhüllungsbereich 20 be attached / screwed. The second ring element 17 is then preferred to the spring receiving part 18 pressed.

In further embodiments, the ring elements 16 . 17 on the respective spring receiving part 18 or Federeinhüllungsbereich 20 also be welded.

LIST OF REFERENCE NUMBERS

1

 Zugmittelspanner

2

 base

3

 tensioning part

4

 coil spring

5

 attack

5a

 first stop part

5b

 second stop part

6

 housing area

7

 check valve

8th

 closing body

9

 stop cap

10

 Front side of the housing area

11

 Front side of the clamping part

12

 buffer

13

 fixed housing, housing

14

 palm

15

 contact edge

16

 first ring element

17

 second ring element

18

 Spring receiving part

19

 buffer ring

20

 Federeinhüllungsbereich

21

 piston area

22

 pressure chamber

23

 storage space

24

 receiving cap

25

 Fluid passage

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2009/074566 A1 [0002]
• EP 2217831 A1 [0002]
• US 4790801 A [0003]
• US 2013/0260931 A1 [0003]
• US 2014/0057748 A1 [0003]
• EP 2101082 A2 [0003]
• DE 102011088214 A1 [0003]

Claims (10)

Traction device tensioner ( 1 ) for biasing a continuous drawing means of an internal combustion engine, comprising: - a base part ( 2 ), - a clamping part ( 3 ) relative to the base part ( 2 ) is displaceable, - and one between the base part ( 2 ) and the clamping part ( 3 ) clamped spring ( 4 ) for applying the biasing force, characterized in that the Zugmittelspanner ( 1 ) one the clamping force of the spring ( 4 ) upwards limiting stop ( 5 ) with a first stop part ( 5a ) at the base part ( 2 ) and a second stop part ( 5b ) on the clamping part ( 3 ), wherein the stop parts ( 5a . 5b ) are arranged so that in the event of an attack the length of the spring ( 4 ) is greater than the block length. Traction device tensioner ( 1 ) according to claim 1, characterized in that the first stop part ( 5a ) Part of a housing area ( 6 ) one in the base part ( 2 ) arranged check valve ( 7 ). Traction device tensioner ( 1 ) according to claim 2, characterized in that the housing area ( 6 ) a closing body ( 8th ) of the check valve ( 7 ) surrounding stop cap ( 9 ). Traction device tensioner ( 1 ) according to claim 2 or 3, characterized in that the housing area ( 6 ) a the clamping part ( 3 ) facing end face ( 10 ), which serves as a stop surface for a second stop part ( 5b ) forming end face ( 11 ) of the clamping part ( 3 ) serves. Traction device tensioner ( 1 ) according to claim 4, characterized in that on the clamping part ( 3 ) facing end face ( 10 ) of the housing area ( 6 ) an attack buffer ( 12 ) is attached. Traction device tensioner ( 1 ) according to claim 1, characterized in that the first stop part ( 5a ) through a housing-fixed area ( 13 ) of the base part ( 2 ) is trained. Traction device tensioner ( 1 ) according to claim 6, characterized in that the first stop part ( 5a ) by a conical, annular inner surface ( 14 ) on a housing ( 13 ) of the base part ( 2 ) is formed, wherein the clamping part ( 3 ) on its front side ( 11 ) a complementary to this inner surface ( 14 ) formed contact edge ( 15 ), which the second stop member ( 5b ). Traction device tensioner ( 1 ) according to claim 1, characterized in that the first stop part ( 5a ) by at least one first ring element ( 16 ) connected to the base part ( 2 ), is formed, wherein a second ring element ( 17 ), which by means of a spring receiving part ( 18 ) on the clamping part ( 3 ) is attached, the second stop member ( 5b ). Traction device tensioner ( 1 ) according to claim 8, characterized in that between the ring elements ( 16 . 17 ) a buffer ring ( 19 ) is arranged. Traction drive with a Zugmittelspanner ( 1 ) according to one of claims 1 to 9.

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