DE102012204868A1 - Tensioning rail for traction drive device of internal combustion engine in vehicle e.g. car, has guide arbor provided at metal sheet component, and guide track portion arranged at rear surface facing away from sliding surface - Google Patents

Abstract

The tensioning rail (1) has a sliding portion (2) provided with a sliding surface (3) which is connected with a continuous traction mechanism of a traction mechanism drive element. A guide track portion (5) is arranged at a rear surface (4) facing away from the sliding surface. A wedge portion is connected with a connection element on the guide track portion. The guide track portion is formed on a metal sheet component (6). A guide arbor (8) is provided at the metal sheet component. The wedge portion is made of polyamide material.

Description

Prayer of the invention

The invention relates to a tensioning rail for a traction mechanism drive of an internal combustion engine, having a sliding body which has a sliding surface which is designed for sliding in contact with an endless traction means of the traction mechanism drive, wherein on the side facing away from the sliding surface back of the tensioning rail, a guide track is defined which is movably mounted with a wedge engageable with a combustion engine fixed contact element.

Traction drives are used in internal combustion engines to produce a force-transmitting connection between a crankshaft and a camshaft and / or an intermediate shaft. The intermediate shaft can then drive ancillaries, such as generators, alternators or pumps.

Such traction drives are used in motor vehicles, such as cars, trucks, but also aircraft, and other land-based or water-bound vehicles.

Frequently, however, such traction drives are also used in light motorcycles.

In such Zugmitteltrieben clamping devices are then used, which are biased either by means of hydraulic or mechanical tensioner. For the deflection of the clamping device such tensioners are used, which can be used with different traction means. In this way, both chains and belts can be pretensioned.

However, hydraulic tensioners, such as hydraulic chain tensioners, have the disadvantage that they must be supplied with a pressure medium, which often oil, z. As engine oil, is. For the corresponding oil supply then appropriate lines must be maintained that make the traction mechanism drive considerably heavier. Since the pressure medium lines are also exposed to high pressures and must be correspondingly massive, this alone high costs are the result.

Alternative tensioners, which are less expensive and require fewer attachments, are mechanical tensioners, such as those from the EP 0409460 B1 and the EP 0869298 B1 are known. These mechanical tensioners work either on a pawl system or on a tightening system.

However, the so-called. Pawl clamps have the disadvantage that they only allow a gradual readjustment and do not allow continuous adjustment of the clamping rail. Just such a continuous adjustment of the clamping rail to deflect the traction means again and thereby compensate for temperature and wear-related elongations, however, is desirable. Also, the so-called. Pawl clamps are characterized by a high component cost.

The known as mechanical Schraubtriebspanner solutions also call for a high component cost.

Both known mechanical tensioners are still not available as system solutions, which means that a separate clamping element between the separate clamping rail and the internal combustion engine must be installed. This causes an increased installation effort.

Alternative solutions are also from the DE 10 2008 051 143 A1 known. There is a tensioning device to compensate for elongations of a traction device, with a clamping means, wherein between the clamping means and a support surface on the internal combustion engine, a clamping element is arranged, wherein the clamping element forms a structural unit with the clamping means, wherein the clamping element further on a track of the Guided tensioning means and is designed as a clamping piece and wherein the raceway relative to the support surface forms an angle.

There are already approaches to realize system solutions, which are installed from two types of plastic clamping rails. However, these clamping rails constructed exclusively of plastic are not temperature-resistant, since the modulus of elasticity changes greatly as a function of the temperature influence on plastics, in particular on polyamides.

Also known from the prior art are plastic wedge clamps which use two different components of plastic. Often, two types of polyamide are used, one being polyamide 66 and the other polyamide having a glass fiber reinforcement. However, unfortunately, as already explained above, the modulus of elasticity of polyamide changes greatly, depending on the plastic wedge tension acting temperature.

Previously known plastic wedge clamps are designed as pure plastic versions and are usually used in the low price segment. Although the existing plastic-plastic mating pairings work well enough, they have limitations in terms of durability and homogeneity of the sliding surface. It can happen that the glass fibers of the support body Excessive erosion on the counterpart, namely the wedge, cause. Desweit changes the surface texture, in particular the roughness and thus the sliding properties of the wedge on his career in the course of operation. In addition, a decrease in the rigidity and dimensional stability of the plastic components is added as a disadvantage, since the stability decreases with increasing temperature. Ergo operating conditions can arise in which deform the sliding pairings against the fact that an optimal sliding movement is not possible.

It is the object of the present invention to provide an improvement here.

It should also be presented a solution in which an oil supply is not necessary, a lower component cost is the result and a system solution can be achieved, so a combination of tensioner and tensioning rail can be offered. In particular, also temperature effects should be switched off as possible.

Disclosure of the invention

This object is achieved in that the guideway is formed on a separate from the clamping rail sheet metal component, which comprises a guide pin.

Since one or more springs are often used to achieve the displacement of the wedge in one and / or the other direction, it is advantageous if a spring guide pin is formed by the sheet metal component. The wedge is then penetrated by the spring guide pin and the corresponding spring is in abutment with the wedge, the spring surrounding the spring guide pin.

Such sheet metal components can be brought by punching operations and Umbiegevorgängen in a desired shape, the material and processing costs remain low.

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

Thus, it is advantageous if the sheet metal component is formed as a ferrous alloy-containing and / or light metal alloy-containing stamped part. A metallic texture of the guideway increases durability and reduces temperature sensitivity.

It is also advantageous if the wedge is constructed of plastic, such as polyamide, in particular polyamide 66. In this way, a low-cost material can be accessed.

If the tensioning rail has a supporting body which is constructed from a material diverging from the material of the sliding lining and the sheet-metal component, then each element of the tensioning rail can be adapted to the requirements and loads acting thereon. A particularly targeted interpretation is the result.

Alternatively or additionally, it is also possible to produce a support body made of a polyamide material with glass fiber reinforcement.

The assembly can be facilitated if the sliding coating and the sheet metal component are mounted on the support body, preferably with a clip connection.

The spring-guiding mandrel can be produced particularly efficiently if the spring-guiding mandrel has a triangular, V, U or round profile in cross section.

Adjusted Abwinkel-, seaming or crimping operations can be used cost-effectively, if the profile is achieved by a Falzbauteilgestaltung.

A further advantageous embodiment is characterized in that on both sides of a longitudinal axis of the sheet metal component, extending in the direction of the support body extending retaining arms, for snapping attaching the sheet metal component to the support body are present. Even with such a measure, the assembly can be facilitated and produce a particularly easy-to-control connection of sheet metal component and supporting body.

It is advantageous if the holding arms each have a hole designed as a window, so that a projection of the supporting body can protrude through the window in order to form and / or force fit with the sheet metal component.

It is also advantageous if projection-like tabs are present at a longitudinal end of the sheet metal component, which are engageable with the supporting body, the position of the sheet metal component in operative contact.

The invention also relates to a traction mechanism drive with a traction means, and a tensioning rail according to the invention. The traction means is in abutment with the sliding body, whereas the wedge is in abutment with a contact element such as the engine block of the internal combustion engine.

The invention is explained below with reference to a drawing.

It is shown a first embodiment. Show it:

1 a perspective view of a section of a clamping rail according to the invention, and

2 a perspective view of a on the clamping rail according to the invention 1 attached sheet metal component.

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

In 1 is a first embodiment of a tensioning rail according to the invention 1 illustrated, which is provided for a traction drive of an internal combustion engine. It has a slider 2 on.

The slider 2 has a sliding surface 3 on, which is designed for sliding in contact with a not shown endless traction means of the traction mechanism drive. On one of the sliding surface 3 facing away back 4 The tensioning rail is a guideway 5 available. The guideway 5 is part of a separate sheet metal component 6 , The sheet metal component 6 is a stamped part made of an iron alloy, in particular steel.

The sheet metal component 6 is on a section of the tensioning rail 1 , which as a separate support body 7 trained is attached. The sheet metal component 6 also has a spring guide pin 8th on top of a spring 9 is surrounded. On the spring-thorn 8th is also a wedge 10 slidably mounted, the wedge 10 made of polyamide, in particular PA 66 is made. The wedge 10 has an arcuate, convex surface with the reference numeral 11 is provided. This arcuate, convex surface 11 is brought into contact with a contact element, not shown.

The sheet metal component includes next to the guideway 5 and the spring guide pin 8th also two retaining arms 12 on each side of a longitudinal axis, not shown, and at the other end, the support arms 12 opposite, two projection-like tabs 13 ,

In such an embodiment according to the invention can be difficult to injection technology implementation of the spring guide mandrel 8th be waived and resorted to the installation of a cost-effective sheet metal part.

In 2 is, as well as in 1 , a window-like embodiment of a hole 14 to recognize. In this hole 14 engages a projection of the support body 7 , As a result, a positive and / or non-positive connection between the support body 7 and the sheet metal component 6 created.

The sheet-metal bent sheet-metal component 6 with the holding arms 12 is aim Beriech a body executed in a U-profile. The holding arms 12 show holes 14 on, with which the sheet metal part 6 on the support body 7 is fixed over snaps. As a special feature occurs the spring guide pin 8th in appearance, which has a twice 90 ° fold 16 is integrated directly in the main body. The spring guide pin 8th is designed as a triangular profile, but can alternatively be made as a V, U or round profile.

With the tabs 13 at the front end, the component on the support body 7 fixed and secured against lifting.

LIST OF REFERENCE NUMBERS

1

tensioning rail

2

sliding

3

Sliding surface

4

back

5

guideway

6

sheet metal component

7

supporting body

8th

Spring guide pin

9

feather

10

wedge

11

arched, convex surface

12

holding arm

13

flap

14

hole

15

head Start

16

fold

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

• EP 0409460 B1 [0007]
• EP 0869298 B1 [0007]
• DE 102008051143 A1 [0011]

Claims (9)

Tensioning rail ( 1 ) for a traction drive of an internal combustion engine, with a sliding body ( 2 ), which has a sliding surface ( 3 ), which is designed for sliding in contact with an endless traction means of the traction mechanism drive, wherein on the surface of the sliding ( 3 ) facing away from the back ( 4 ) of the tensioning rail ( 1 ) a guideway ( 5 ) on which a wedge (14) which can be brought into contact with an internal combustion engine-fixed contact element ( 10 ) is slidably mounted, characterized in that the guideway ( 5 ) on one of the tensioning rail ( 1 ) separate sheet metal component ( 6 ) is formed and a guide pin ( 8th ) through the sheet metal component ( 6 ) is trained. Tensioning rail ( 1 ) according to claim 1, characterized in that the sheet metal component ( 6 ) is formed as iron alloy-containing and / or light metal alloy-containing stamped part. Tensioning rail ( 1 ) according to claim 1 or 2, characterized in that the wedge ( 10 ) made of plastic, such as polyamide, in particular polyamide 66 is constructed. Tensioning rail ( 1 ) according to one of claims 1 to 3, characterized in that the tensioning rail ( 1 ) a supporting body ( 7 ), which consists of one of the material of the slider ( 2 ) and the sheet metal component ( 6 ) diverging material is constructed. Tensioning rail ( 1 ) according to claim 4, characterized in that the sliding body ( 2 ) and the sheet metal component ( 6 ) on the support body ( 7 ), preferably with a clip connection. Tensioning rail ( 1 ) according to claim 5, characterized in that the spring guide pin ( 8th ) has in cross section a triangular, a V, a U or a round profile. Tensioning rail ( 1 ) according to claim 6, characterized in that the profile is achieved by a Falzbauteilgestaltung. Tensioning rail ( 1 ) according to one of claims 1 to 7, characterized in that on both sides of a longitudinal axis of the sheet metal component ( 6 ) in the direction of the supporting body ( 7 ) extending retaining arms ( 12 ), for snapping attaching the sheet metal component ( 6 ) on the support body ( 7 ) available. Traction drive with a traction means and a tensioning rail according to one of claims 1 to 8.

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