阅读说明：本技术 用于继续加工成用于平环链的链环的冲压件和用于经由冲压工艺制造链环的对应的方法 (Stamping for further processing into a chain link for a flat chain and corresponding method for producing a chain link via a stamping process ) 是由 M·法尔克 于 2020-05-06 设计创作，主要内容包括：本发明涉及一种用于冲压件(14),用于继续加工成用于变速器的平环链(11)的链环(10),其中所述冲压件(14)借助于包括多个步骤的冲压工艺制造并且在其外环周(28)处具有至少一个连接结构(32,34,36,38),经由所述连接结构,冲压件(14)暂时连接于从中冲出所述冲压件的面状的基本材料的剩余部分,其中外环周(28)由冲压件(14)的两个纵向侧(18,20)和两个竖直侧(22,24)形成。此外,本发明涉及一种用于制造用于平环链(11)的链环(10)的对应的方法,其中借助于包括多个步骤的冲压工艺制造冲压件(14),所述冲压件在其外环周(28)处具有至少一个连接结构(32,34,36,38),经由所述连接结构,冲压件(16)暂时连接于从中冲出所述冲压件的面状的基本材料的剩余部分,所述外环周由冲压件(14)的纵向侧(18,20)和竖直侧(22,24)形成。(The invention relates to a stamping (14) for further processing into a chain ring (10) of a flat chain (11) for a transmission, wherein the stamping (14) is produced by means of a stamping process comprising a plurality of steps and has at its outer circumference (28) at least one connecting structure (32, 34, 36, 38) by means of which the stamping (14) is temporarily connected to the remaining part of the planar base material from which it is stamped, wherein the outer circumference (28) is formed by two longitudinal sides (18, 20) and two vertical sides (22, 24) of the stamping (14). The invention further relates to a corresponding method for producing a chain link (10) for a flat link chain (11), wherein a stamping (14) is produced by means of a stamping process comprising a plurality of steps, said stamping having at least one connecting structure (32, 34, 36, 38) on its outer circumference (28), via which the stamping (16) is temporarily connected to the remainder of the planar basic material from which it is stamped, said outer circumference being formed by the longitudinal sides (18, 20) and the vertical sides (22, 24) of the stamping (14).)

1. A stamping (14) for further processing into a chain ring (10) of a flat link chain (11) for a transmission, wherein the stamping (14) is produced by means of a stamping process comprising a plurality of steps and has at its outer circumference (28) at least one connecting structure (32, 34, 36, 38) via which the stamping (14) is temporarily connected to a remaining portion of a planar base material from which the stamping is stamped, wherein the outer circumference (28) is formed by two longitudinal sides (18, 20) and two vertical sides (22, 24) of the stamping (14),

characterized in that the connecting structure or at least one of the connecting structures (36, 38) is formed on one of the longitudinal sides (20) of the stamping (14).

2. A stamping according to claim 1, characterized in that one of the two longitudinal sides (20) is shorter than the other longitudinal side (18), wherein the at least one connecting structure (36, 38) is formed on the shorter longitudinal side (20).

3. A stamping according to claim 1 or 2, characterized in that a plurality of connecting structures (36, 38) are formed on the longitudinal sides (20) of the stamping (14).

4. A stamping according to one of claims 1 to 3, characterized in that at least one connecting structure (36, 38) formed on the longitudinal sides (20) of the stamping (14) is provided in the region of the outer ring periphery (16) which serves as a guide region (40, 42) for a sliding rail in a chain link (10) of the flat link chain (11).

5. A stamping according to one of claims 1 to 4, characterized in that at least one passage (26) is formed in the stamping (14), which can be penetrated by a pivot pin (12) of the flat link chain (11).

6. A stamping according to claim 5, characterized in that a cam-shaped structure (50, 52, 54) is present on an inner circumference (48) of the stamping (14) which delimits the passage (26), said cam-shaped structure reducing the passage (26).

7. A stamping according to one of claims 1 to 6, characterized in that at least one of the two longitudinal sides (20) is designed concavely in a central region (44) for accommodating a housing region of at least one shaft of the transmission.

8. A method for producing a chain link (10) for a flat link chain (11), wherein a stamping (14) is produced by means of a stamping process comprising a plurality of steps, the stamping having at least one connecting structure (32, 34, 36, 38) on its outer circumference (28), the stamping (16) is temporarily connected to the remaining part of the flat basic material from which the stamping is punched out by means of the connecting structure, the outer circumference is formed by the longitudinal sides (18, 20) and the vertical sides (22, 24) of the stamping (14), wherein the connecting structure or at least one of the connecting structures (36, 38) is formed on one of the longitudinal sides (20) of the stamping (14), and the stamping (14) is subsequently further processed into the chain ring (10) by means of at least one further processing step.

9. Method according to claim 8, characterized in that the connection of the stamping (16) to the remainder of the flat basic material via the at least one connecting structure (32, 34, 36, 38) is released by means of a shearing or other separation method.

10. A method according to claim 8 or 9, wherein the or at least one of the further machining steps is a cutting step.

Technical Field

The invention relates to a stamping for further processing into a chain ring of a flat chain for a transmission, wherein the stamping is produced by means of a stamping process comprising a plurality of steps and has at least one connecting structure at its outer circumference, via which the stamping is temporarily connected to a remaining portion of planar basic material from which the stamping is stamped, wherein the outer circumference is formed by two longitudinal sides and two vertical sides.

The invention further relates to a method for producing a chain link for a flat link chain, wherein a stamping part is produced by means of a stamping process comprising a plurality of steps, said stamping part having at least one connecting structure at its outer circumferential periphery, via which connecting structure the stamping part is temporarily connected to the remainder of the planar basic material from which the stamping part is stamped, the outer circumferential periphery being formed by longitudinal and vertical sides.

Background

Such a manufacturing method and a corresponding stamping as an intermediate product/semi-finished product are completely known from the practice of manufacturing such chain links.

The chain ring is then used together with the pivot pin to construct a belt drive for the transmission. Such belt drives having an arrangement of chain links and pivot pins are generally referred to as flat link chains (chains for short). Furthermore, belt drives are also available in which a combination of a flat link chain and a belt is realized. The Transmission mentioned is usually a Continuously Variable Transmission, which is also referred to as a CVT Transmission (Continuously Variable Transmission). The main application is in the drive train of a motor vehicle.

Audible or perceptible vibrations and chain strengths, which are ascribed to the term NVH (Noise Vibration Harshness, Noise, Vibration, Harshness) in motor vehicles, are the main subjects in the development of such belt drives.

Furthermore, there is a constant need for improving the chain with regard to efficiency and wear and for achieving as small a running radius as possible.

A decisive variable for combining the vibrations and the acoustic phenomena associated therewith is the pitch T of the link chain, which is defined according to document DE 4330696C 1 as "spacing between the rocker faces of adjacent rocker pin pairs". Said document also mentions that the corresponding links of such a flat link chain are usually manufactured by stamping.

In order to improve the acoustics, it is sought to reduce the pitch T still further. However this usually only increases the cost of the strength of the chain.

Disclosure of Invention

The object of the invention is to provide measures by means of which a flat link chain of sufficient strength can be achieved or realized, the acoustics of which are acceptable in operation.

Said object is achieved according to the invention by the features of the independent claims. Preferred embodiments of the invention are given in the dependent claims, which can each show aspects of the invention individually or in combination.

The stamping according to the invention for further processing into a chain ring of a flat link chain for a transmission is produced by means of a stamping process comprising a plurality of steps and has at least one connecting structure at its outer circumferential periphery, via which the stamping is connected to the remaining part of the planar basic material from which the stamping is stamped, wherein the outer circumferential periphery is formed by two longitudinal sides and two vertical sides, it being provided in the stamping that the connecting structure or at least one of the connecting structures is formed on one of the longitudinal sides of the stamping.

By positioning at least a part of the connecting structure on one longitudinal side of the stamping for the chain link, the freedom of configuration of the chain link geometry is significantly increased, so that the geometry can be matched to the desired pitch, so that the desired strength is obtained. Further, the guide length for the slide rail can be increased. The guide of the slide rail preferably coincides with the connecting structure/punch connection on at least one longitudinal side.

Typically, at least one of the longitudinal sides is longer than each individual vertical side of the vertical sides. The longitudinal sides are oriented in their longitudinal or travel direction in a flat-link chain or belt drive.

According to a preferred embodiment of the invention, one of the two longitudinal sides is shorter than the other longitudinal side, wherein at least one connecting structure is formed on the shorter longitudinal side.

It is advantageously provided that a plurality of connecting structures are formed on the longitudinal sides of the stamping. Usually, these are two connecting structures which are formed on the longitudinal sides of the stamping part, in a clearly spaced-apart manner.

According to a further preferred embodiment of the invention, the at least one connecting structure formed on the longitudinal side of the stamping is arranged in a region of the outer ring circumference which serves as a guide region for the running rail in the chain link of the flat link chain. In the case of a plurality of connecting structures, there are usually a plurality of regions of the outer circumference which serve as guide regions for the running rails in the links of the flat link chain.

Preferably, one or more through-openings are formed in the stamping, which through-openings can be penetrated by pivot pins of the flat link chain.

It is advantageously provided that a projection-shaped structure is present on the inner circumference of the stamping part which delimits the passage opening, said projection-shaped structure reducing the passage opening. The lug formation is typically used to limit the range of motion of the rocker pin.

According to a further preferred embodiment of the invention, at least one of the two longitudinal sides is designed to be concave in the central region in order to accommodate a housing region of at least one shaft of the transmission.

In a method according to the invention for producing a chain link for a flat link chain, in which a stamping part is produced by means of a stamping process comprising a plurality of steps, which stamping part has at its outer circumferential periphery at least one connecting structure, via which the stamping part is temporarily connected to the remainder of the planar basic material from which the stamping part is stamped, the outer circumferential periphery being formed by longitudinal sides and vertical sides, it is proposed that at least one of the connecting structures or the connecting structures is formed on one of the longitudinal sides of the stamping part, and that the stamping part is subsequently further processed into a chain link by means of at least one further processing step. The features mentioned in connection with the stamping are correspondingly also applicable to the manufacturing method. In other words, the stamping is in particular the stamping mentioned above.

According to a preferred embodiment of the method according to the invention, the connection of the stamping part to the remainder of the flat base material via the at least one connecting structure is released by means of a shearing method or other separation method.

According to a further preferred embodiment of the method according to the invention, it is provided that the further machining step or at least one of the further machining steps is a cutting step. Said step is for example a grinding step.

Drawings

The invention is explained below in an exemplary manner according to preferred embodiments with reference to the drawings, wherein the features illustrated below are each individually and also in combination capable of illustrating aspects of the invention. The figures show:

figure 1 shows the arrangement of one chain ring and two pressure elements of a belt drive constructed as a flat chain for a CVT transmission,

FIG. 2 shows a section of a belt drive designed as a flat link chain, and

fig. 3 shows a CVT transmission with a belt transmission constructed as a flat-link chain.

Detailed Description

Fig. 1 shows a chain ring 10 and two pivot pins 12 of a belt drive for a Continuously Variable Transmission (CVT Transmission). Such a transmission is used in particular in a drive train of a motor vehicle. From such a chain link 10 and pivot pin 12, a flat link chain 11 forming a belt drive can be produced, which is shown in fig. 2. The chain link 10 is produced by means of a stamping process comprising a plurality of steps, wherein a stamping 14 for further processing into the chain link 10 is produced as an intermediate product or semi-finished product. The stamping 14 already has the basic shape of the chain link 10 here. The terms chain link 10 and stamping 14 are therefore used synonymously in the following with respect to their geometry.

The flat link chain 11 is basically constituted by a link 10 and a swing pin 12 (abbreviated as WDS). Each chain link 10 has a frame-like configuration which, with respect to the direction of travel of the belt drive (double arrow 16), comprises one longitudinal element each on both longitudinal sides 18, 20 and one vertical element each on both vertical sides 22, 24, so that it encloses an opening which is formed as a through opening 26 in the center of the respective chain link 10. The respective chain link 10, due to the arrangement of the longitudinal and vertical elements 18, 20, 22, 24, has substantially the shape of an isosceles trapezium with a corresponding outer circumferential periphery 28, which is axisymmetric about a (imaginary) central axis 30. In a flat link chain, the pivot pins 12 are now coupled in pairs into the openings 26 of the chain link 10 in order to form a pair of pivot pins each serving as a hinge.

In fig. 1, one pivot pin 12 of each pivot pin pair is shown, while the other pivot pin of the respective pivot pin pair is not shown. In such a flat link chain, the sequence of the chain links 10 can be repeated in a targeted manner transversely to the direction of travel of the belt drive, so that a corresponding chain link pattern is obtained. Links 10 of different link types are sometimes also constructed in a flat link chain. The different link types are furthermore distinguished by different link lengths. The joint formed by the two pivot pins 12 of the pivot pin pair is also commonly referred to as a rocker joint.

As mentioned at the outset, a stamped part 14 is obtained as an intermediate product during the production of each chain link 10, which stamped part is further processed by at least one further processing step to form the respective chain link 10. At least one point in the stamping process for the production thereof, which comprises several steps, the stamping 14 has, on its outer circumference 26, several connecting structures 32, 34, 36, 38, via which the stamping 14 is connected to the remainder of the sheet material from which it is normally stamped, until the end of the stamping process, at which point the stamping is separated from the remainder of the sheet material in a shearing manner. The connecting structures 32, 34, 36, 38 are also referred to as stamped connections. Two of the connecting structures 36, 38 are formed on the shorter of the two longitudinal sides 20 of the stamping 14, and the other two connecting structures 32, 34 are each located in the transition region between the longer of the two longitudinal sides 18 and one of the vertical sides 22, 24.

On the longitudinal sides 20, the connecting structures 36, 38 can now be positioned in the regions which serve as guide regions 40, 42 for the slide rails in the links 10 of the flat link chain.

By positioning the connecting structures (stamped connections) 36, 38 into the, here shorter, longitudinal side 20, the freedom of configuration of the geometry of the chain link 10 is significantly increased and the strength can be increased. Further, the guide length for the slide rail can be increased. The guides of the slide rail on the longitudinal sides 20 coincide with the connecting structures (punched connections) 36, 38. The other guide region 44 is centrally located at the other longitudinal side 18.

In a central region 46 between the two guide regions 40, 42, the longitudinal sides 20 are designed concavely to accommodate a housing region of at least one shaft of the transmission. In this way, a small encircling radius can also be achieved.

At the inner circumferential edge 48 of the chain link 10 there are projection formations 50, 52, 54 which reduce the through-opening 26. The cam formation serves to limit the range of movement of the pivot pin 12 in the passage 26, at least in part.

Fig. 2 shows a part of a flat link chain 11 forming a belt drive. Here, an arrangement of chain links 10 arranged parallel to the direction of travel of the belt drive and pivot pins 12 oriented transversely to the direction of travel of the belt drive engage in pairs into the passages 24 to form pivot pin pairs 56 serving as hinges.

The two pivot pins 12 of each pivot pin pair 56 have sides facing each other with a rocking surface on which they can roll on each other or on which they can move slidingly on each other, so that the chain links 10 are connected to each other in an articulated manner about the respective hinge axis by means of the pressure element 12 formed in this way. In the chain ring 10 shown here, each two pendulum pin pairs 56 engage into a respective through opening 26 of the chain ring 10. On the longitudinal sides, which are opposite to one another in the longitudinal direction of the pressure pieces 12, the pressure pieces 12 each project with an end section from the arrangement of the chain ring 10. A fastening element, such as, for example, a fastening pin (not shown), can then be provided on the end piece.

A corresponding continuously variable transmission 58 is shown in fig. 3. The transmission includes: a transmission input side 60 and a transmission output side 62, which each have one shaft 64, 66 and one bevel pair 68, 70 arranged on the respective shaft; and the belt drive in the form of a flat link chain 11, which is formed by the chain links 10 and the pressure elements 12, is arranged in the torque flow between the two cone pulley pairs 68, 70. The continuously variable transmission 58 shown here is therefore also referred to as a conical pulley belt transmission.

Belt drives are designed for transmitting forces and torques in a conical pulley belt drive, which is arranged, for example, in the drive train of a motor vehicle between a drive machine and a driven shaft. The continuously variable transmission 58 adapts the transmission gear ratio to the respective driving behavior and operating conditions of the drive machine or to the driver's request for the drive machine, for example as a result of an accelerator pedal actuation.

The belt drive connects the two conical pulley pairs 68, 70 or conical pulley sets within the conical pulley belt drive in the force or torque flow, wherein by varying the running radius of the belt drive about the axis of the respective conical pulley pair 68, 70, a transmission ratio change can be achieved and controlled in a targeted manner. This can be controlled in a targeted manner by means of the control unit. One bevel pair 68 of the transmission is connected or connectable with at least the transmission input shaft 64, and the other bevel pair 70 is connected or connectable with the output shaft 66 of the transmission 58.

Description of the reference numerals

10 chain ring (flat link chain) 11 flat link chain 12 swing pin 14 stamping 16 double arrow (direction of travel) 18 longitudinal side 20 longitudinal side 22 vertical side 26 through 28 outer circumference 30 central axis 32 connecting structure 34 connecting structure 38 connecting structure 40 guiding region 42 guiding region 44 region 46 inner circumference 48 structure 50 structure 54 swing pin pair 58 continuously adjustable transmission 60 transmission input side 62 transmission output side 64 shaft 66 shaft 68, 70 cone pulley pair