EP3374664A1

EP3374664A1 - Drive chain turning link plate

Info

Publication number: EP3374664A1
Application number: EP16759972.9A
Authority: EP
Inventors: Hermann Stief; Christopher SCHAFFELHOFER
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2015-11-12
Filing date: 2016-07-29
Publication date: 2018-09-19
Also published as: WO2017080546A1

Abstract

A drive chain link plate (1) for a chain link of a chain drive system is described, which drive chain link plate (1) has two pin receiving holes which are spaced apart from one another in the longitudinal direction (5), wherein there are two link plate backs (6) on each outer side of said link plate (1), on both sides of the longitudinal axis (5), wherein the one link plate back (7) is configured parallel to the link plate longitudinal direction, wherein, furthermore, the other link plate back (8) has a convex outer contour. Furthermore, a drive chain link having two drive chain link plates (1) according to the invention which are arranged in parallel and are connected via two pins (4) is described. A drive chain drive system is also described, wherein the drive chain link plates (1) and/or the drive chain links correspond in each case to the invention, wherein the drive chain drive system is preferably designed as a pin chain, a sleeve-type chain or a roller chain.

Description

Drive chain reversing flap

The present invention relates to a chain drive with a slide rail, which has a sliding surface, and with a drive chain, which has as Endloszugmittel a drive chain link of a drive chain link with an inside and an outside, wherein the drive chain link has two longitudinally spaced apart bolt receiving holes and on both sides to the longitudinal axis a first plate back on the one hand and a second plate back on the other.

Instead of the term drive chain link, the term link link or, even shorter, the term link can also be used briefly.

The longitudinal direction may be defined as a direction of a line connecting respective centers of the two generally present bolt receiving holes, or as the power transmission direction in a traction-only transmission link plate.

Under a laschenlängsrichtungsparallel trained tab back can both a laschenlängsrichtungsparallel and rectilinear trained tab back, a laschenlängsrichtungsparallel and substantially rectilinear trained tab back and a laschenlängsrichtungsparallel and concave trained tab back are understood.

A generic drive chain link is disclosed in DE 10 2006 017 247 A1. This relates to a timing chain drive with a joint chain, in particular a roller chain, interconnected by chain links inner chain links and outer chain links, wherein the inner chain links and outer chain links comprise mutually parallel inner plates and outer plates. In this case, the timing chain drive can be designed so that the inner plates and / or the outer a bearing surface for abutment against a circumferential support contour of a chain guide of a sprocket have, and further, the bearing surface of the inner plates and / or the outer plates may be arranged substantially parallel to the direction of the joint chain.

Such to the running direction of the joint chain arranged in parallel bearing surfaces or laschenlängsrichtungsparallel formed flap back, for example, good Geradlaufeigenschaften be attributed in a chain guide. Therefore, there is a need for tab-length parallel formed tab backs.

In DE 10 2010 013 572 A1 it is proposed that an edge of each link plate provided for sliding contact with a guide element is continuously curved, with a distance measured perpendicularly from a point on a line connecting the centers of the front and rear connection passages the edge is maximum when the point is spaced from a midway point between the centers of the front and rear connection passages, whereby this link plate has an asymmetrical shape.

The continuously curved edge is intended to achieve a wedge-shaped oil film which reduces the friction on a guide rail. Due to the asymmetric shape of the link plate in the longitudinal direction, a pivoting movement is to be made possible by changes in the chain tension in order to avoid sliding contact at the same point and to reduce abrasive wear.

A chain drive design according to DE 10 2012 104 803 A1 provides that pairs of inner plates and pairs of outer plates are mutually rotatable and alternately connected in the chain longitudinal direction, on the one hand, each inner plate has an oval tab shape with an arcuate Gleitkontaktbereich, and on the other hand, each outer plate a oval flap shape with a chain-length parallel to the straight line region, wherein a back height of the outer flap is smaller than a back height of the inner flap, so that only the inner flap can come into sliding contact with a chain guide.

This is intended, inter alia, to achieve a reduction in the frictional resistance on a chain guide by reducing the contact area of the entire transmission chain.

Both convex flap backs as well as longitudinally parallel flap backs thus have specific advantages, and both designs are used. Therefore, both types are to be kept by the manufacturer.

Therefore, it is an object of the present invention to reduce manufacturing costs.

The object is achieved by a chain drive with the features of the main claim. Accordingly, the first plate back is laschenlängsrichtungsparallel and formed substantially straight and the second plate back has a - with respect to the tab longitudinal direction - convex outer contour, wherein the second plate back is disposed on the outside of the drive chain and can be brought into contact with the sliding surface.

Thus, two straps prepared for different and / or different sliding contact properties, namely good straight-line running and / or reduced wear and / or low frictional resistance and / or a combination thereof, are provided on a chain link, so that during assembly, the

Chain link orientation sliding contact properties defining selectable, so that the production costs can be reduced by reducing the Kettenlaschenvarianten. The solution according to the invention may alternatively be considered as providing two Laschenrücken be described with mutually different sliding contact properties. In order to capture the invention in a catch phrase, the term "helical lobe" can be used because the sliding contact characteristic associated with the respective tab back can be selected by turning the link plate.

Advantageous embodiments are claimed in the subclaims and are explained below. The aspects mentioned there can also be pursued individually, independently of each other and from the main aspect.

In an advantageous embodiment, the drive chain link includes a second back plate whose convex outer contour has a radius between 90 mm and 130 mm. In an advantageous development, the convex outer contour has a radius between 105 mm and 120 mm. In a further advantageous development, the convex outer contour has a radius of 1 10 mm. The radius of about 1 10 mm is chosen so that can advantageously form a friction on a guide rail reducing wedge-shaped oil film.

In a further advantageous embodiment, a line drawn through the centers of the bolt receiving holes and a position located on the first or second link back define a height of the first tab back or a height of the second tab back, the maximum height of the second

Laschenrückens is greater than the maximum height of the first tab back and wherein the difference between the maximum height of the second tab back and the maximum height of the first tab back is between 0.13 mm and 0.17 mm. A difference of about 0.15 mm is selected such that advantageously a wedge-shaped oil film reducing the friction on a guide rail can be formed. In an advantageous development, the slide rail is a tensioning rail or a guide rail, wherein the outside of the drive chain can be brought into contact with the tensioning rail or the guide rail. Such a design of the chain drive has proven itself in applications of the chain drive as a control drive in the field of internal combustion engine.

If the tab backs run continuously and they transition at least continuously or preferably continuously into respective tab ends, a particularly smooth outer contour can be achieved. In this case, a tab end can be defined as a section of the outer contour of the tab which defines and / or delimits and / or closes the link plate in the tongue longitudinal direction. A tab end preferably has at least one circular segment, the center of which is preferably on the tab longitudinal direction and / or within the through the

Laschenaußenkontur without consideration of the bolt receiving holes, and is particularly preferably arranged in the associated bolt receiving hole. A geometrically particularly easy-to-manufacture tab end may in particular be a circular segment-like around the respective pin receiving hole, preferably center point equals, circumferential tab outer contour.

Incidentally, a tooth-free and / or tooth contour-free back plate is particularly well suited for friction-reduced sliding.

A further aspect of the invention is that the tab backs are each transferred for tensile force transmission and / or for substantially force-entry-free tensile force transmission and / or friction-reduced sliding on a guide element, so that the corresponding optimization of the tab back ultimately saves weight and increases the efficiency. Particularly preferably, the drive chain drive system is designed as a bolt chain, sleeve chain or roller chain, because advantageously the application of force to the bolts connecting the tabs with the prepared to achieve desired sliding properties and correspondingly shaped back plate supplements. This can be referred to as a separation of the function between the sliding surface and the load input surface. Another advantage is the fact that the sliding surface is constructively developable independently of the load application surface.

In other words, in view of the various market demands, the invention achieves a link plate with a tongue-length-parallel and / or straight flap back and a link plate with a curved link

Laschenrücken a particular manufacturer-side reduction of product variants, a reduction in friction losses and a manufacturer-side flexibility. In the solution presented, the user can therefore activate or deactivate the curved back of the tab depending on the application and / or individually. In particular, an activation of the curved tab backing during assembly of a drive chain drive system or a drive chain is intended. The drive chain plate according to the invention should be applicable to all sleeve chains, roller chains of such designs.

In yet other words, the invention also deals with a roller chain or sleeve chain, wherein the proposed concept relates to a link plate with an asymmetric profile, wherein a first longitudinal edge or such a strap back wear-optimized and / or designed loss-optimized, whereas the second edge or the second plate back has a conventional design and / or is straight, for example. Thus, inter alia, an advantageous flexibility in production is achieved.

The invention will be described in more detail below with the aid of three embodiments. 1 shows a drive chain link according to the invention a first Embodiment in a side view, ie transversely to an intended drive chain movement direction. The figure is merely schematic in nature and is only for understanding the invention. The same or the same elements are provided with the same reference numerals. Features of one embodiment may also be included in the other embodiments, so they are interchangeable. Showing:

Fig. 1 is a drive chain link with a first and a second

Lasch back;

2 shows an exemplary chain drive arrangement.

FIG. 1 shows a drive chain lug 1, which is preferably a body stamped and / or formed from a flat material, such as sheet metal and the like, but which can also be formed by forming and / or by means of a combination thereof.

The drive chain link 1 - briefly tab 1 - has two bolt receiving holes 2, which are each configured and / or prepared for receiving and holding a bolt, not shown. Each of these bolt receiving holes 2 is an annular recess with a center 3, wherein through the respective center 3 a perpendicular to the plane oriented axis 4 leads. Both centers 3 lie on a tab longitudinal direction 5, it can also be said that the position of the center points 3 defines the tab longitudinal direction 5.

The tab 1 has two tab backs 6, both of which extend substantially along the tab longitudinal direction 5. Of these, a laschenlängsrichtungsparalleler first plate back 7 is formed straight, and the other plate back 6 is a convex second plate back 8, which is bent away from the laschenlängsrichtungsparallelen plate back 7 and has a radius of r = 1 10 mm and a height 23. So both tab backs 6 different from each other. Around each of the bolt receiving holes 2 around a tab end 9 extends like a circle, the radii 10 of these circle segments intersect the respective center 3. At transition points 1 1 each go a tab end 9 and a tab backing 10 continuously, such as uninterrupted, and continuously, as smooth, one another.

An unillustrated drive chain link of a second embodiment, not shown, has two drive chain lugs 1, wherein these are arranged parallel to each other and spaced from each other. The drive chain links 1 of the drive chain link are connected along the axes 4 by means of a bolt, not shown.

FIG. 2 shows a chain drive with a hydraulic tensioning device 12 for a combustion engine with its essential components. A chain drive 20 basically includes a drive sprocket 13 connected to the crankshaft, two output sprockets 14 connected to a respective one camshaft, and a timing chain 15 which connects the drive sprocket 13 to the output sprockets 14. In this way, an inner side 21 and an outer side 22 of the drive chain 15 are defined. About the Zugtrum 16 of the timing chain 15, a drive torque of the crankshaft is transmitted to the camshaft. At Zugtrum 16, the drive chain 15 is guided by a guide rail 17.

The drive chain 15 is stretched at its return strand 18 in order to ensure its functionality over the service life can. For this purpose, the timing chain 15 is acted upon by means of a hydraulic tensioning device 12 and a clamping rail 19 with a clamping force. Hydraulic tensioning devices 12 according to the described embodiment moreover ensure damping of the chain drive 20. The drive chain 15 designed as a timing chain has as drive chain lifting system a plurality of drive chain links according to the second embodiment and thus a plurality of drive chain lugs 1. The Antriebskettenthebsystem is preferably a sleeve chain or a roller chain.

Reference list Drive chain link

Pin receiving hole

Focus

axis

Lasch longitudinally

Lasch back

first flap back

second flap back

tab end

radius

Checkpoint

jig

drive sprocket

driven sprocket

drive chain

drive span

guide rail

loose side

tensioning rail

chain drive

inside

outside

height

Claims

claims

1 . Chain drive (20) with a slide rail (17, 19), which has a sliding surface, and with a drive chain (15), which has as endless draw means a drive chain lug (1) of a drive chain link with an inner side (21) and an outer side (22), wherein the drive chain lug (1) has two bolt receiving holes (2) spaced apart from one another in the longitudinal direction (5) and has a first link back (7) on the one hand and a second link back (8) on both sides relative to the longitudinal axis (5), characterized in that the first link back ( 7) parallel to the longitudinal direction of the tongue and substantially straight, and in that the second flap back (8) has a convex outer contour with respect to the longitudinal direction of the tongue, the second flap back (8) being arranged on the outer side (22) of the drive chain (15) and can be brought into contact with the sliding surface.

2. chain drive (20) according to claim 1, characterized by a drive chain link with two parallel and over two axes (4) connected drive chain lugs (1).

3. chain drive (20) according to one of claims 1 to 2, characterized by a drive chain link (1) with a second plate back (8), whose convex outer contour has a radius between 90 mm and 130 mm.

4. chain drive (20) according to one of claims 1 to 2, characterized by a drive chain lug (1) having a second plate back (8), whose convex outer contour has a radius between 105 mm and 120 mm.

5. chain drive (20) according to one of claims 1 to 2, characterized by a drive chain link (1) with a second plate back (8), whose convex outer contour has a radius of 1 10 mm.

6. chain drive (20) according to any one of claims 1, 2 or 5, characterized in that a through the centers of the bolt receiving holes (2) drawn line and on the first or second tab back (7, 8) located position a height of define first tab back (7) or a height of the second tab back (8), wherein the maximum height of the second

Laschenrückens (8) is greater than the maximum height of the first tab back (7) and wherein the difference between the maximum height of the second

Laschenrückens (8) and the maximum height of the first tab back (7) between 0.13 mm and 0.17 mm.

7. chain drive (20) according to any one of the preceding claims, characterized in that the slide rail is a tensioning rail (19) or a guide rail (17), wherein the outer side (22) of the drive chain (15) with the clamping rail (19) or the Guide rail (17) can be brought into contact.