阅读说明：本技术 具有优化厚度比的压力件和包括压力件的板式环节链 (Pressure element with optimized thickness ratio and plate link chain comprising a pressure element ) 是由 P·弗里茨 M·法尔克 于 2020-03-23 设计创作，主要内容包括：本发明涉及一种用于机动车辆的传动系所用的板式环节链(1)的环节(2)的铰接连接的压力件(3),压力件(3)的在压力件(3)的沿竖向方向的下部部分(8)的下部厚度(7)与压力件(3)的沿竖向方向的上部部分(10)的上部厚度(9)之间的厚度比大于1/1.09,所述厚度(7、9)中的每一者在距压力件(3)的沿竖向方向观察的中心(12)的预定距离(11)处并垂直于所述竖向方向测量。本发明还涉及一种用于机动车辆的传动系的CVT板式环节链(1),其包括多个经由压力件(3)互连的环节(2)。(The invention relates to a pressure piece (3) for the articulated connection of links (2) of a plate link chain (1) for a drive train of a motor vehicle, the thickness ratio of the pressure piece (3) between a lower thickness (7) of a lower part (8) of the pressure piece (3) in the vertical direction and an upper thickness (9) of an upper part (10) of the pressure piece (3) in the vertical direction being greater than 1/1.09, each of the thicknesses (7, 9) being measured at a predetermined distance (11) from a center (12) of the pressure piece (3) viewed in the vertical direction and perpendicular to the vertical direction. The invention also relates to a CVT plate link chain (1) for a drive train of a motor vehicle, comprising a plurality of links (2) interconnected via pressure pieces (3).)

1. Pressure piece (3) for the articulated connection of links (2) of a CVT plate link chain (1) for a drive train of a motor vehicle, characterized in that the thickness ratio of the pressure piece (3) between a lower thickness (7) of a lower portion (8) of the pressure piece (3) in the vertical direction and an upper thickness (9) of an upper portion (10) of the pressure piece (3) in the vertical direction is greater than 1/1.09, wherein the lower thickness (7) and the upper thickness (9) are each measured at a predetermined distance (11) from a center (12) of the pressure piece (3) as seen in the vertical direction and perpendicular to the vertical direction.

2. Pressure piece (3) according to claim 1, characterized in that the pressure piece (3) has a rolling surface (16), wherein the rolling surface (16) is aligned symmetrically with respect to the center (12) as seen in the vertical direction.

3. Pressure piece (3) according to claim 2, characterized in that, when measuring the lower thickness (7) and the upper thickness (9), the pressure piece (3) is aligned such that an upper angle (a) is enclosed between the rolling surface (16) of the upper part (10) and a contour line (15) extending through the center (12) as seen in the vertical direction and aligned parallel to the vertical direction, the upper angle corresponding to a lower angle (β) enclosed between the rolling surface (16) of the lower part (8) and the contour line (15).

4. Pressure piece (3) according to one of claims 1 to 3, characterized in that the thickness ratio is less than or equal to 1.

5. Pressure piece (3) according to one of the claims 1 to 4, characterized in that the predetermined distance (11) is 30% of the total height (14) of the pressure piece (3).

6. Pressure piece (3) according to one of claims 1 to 5, characterized in that the cross section of the pressure piece (3) is constant over the longitudinal extension of the pressure piece (3).

7. Pressure piece (3) according to one of the claims 1 to 6, characterized in that the thickness ratio is between 1/1.05 and 1/1.09.

8. CVT plate link chain (1) for a driveline of a motor vehicle, having a plurality of links (2) interconnected via pressure pieces (3) according to one of claims 1 to 7, at least one link (2) having an outer longitudinal support and having an inner longitudinal support, which are connected to each other via transverse supports, wherein two longitudinal supports and two transverse supports form receiving openings (4) for two pressure pieces (3) which combine to form one pressure piece pair (5).

Technical Field

The invention relates to a pressure element for the articulated connection of links of a drivetrain of a motor vehicle, in particular of a CVT plate link chain for a continuously variable transmission (CVT transmission). The invention also relates to a plate link chain for a drive train of a motor vehicle, having a plurality of links which are connected in an articulated manner via pressure elements, preferably via several pressure elements arranged in pairs and engaging in openings in the links.

Background

Pressure elements and plate link chains with pressure elements are well known from the prior art. For example, EP1862700A1 discloses a plate link chain, in particular for a vehicle drive, the plate link chain has a plurality of links which are articulated to one another via pressure pieces which extend transversely to the longitudinal direction of the plate link chain and are arranged in openings in the links, and having corresponding curved contact surfaces on the pressure element and the ring element, along which the pressure element and the ring element for power transmission rest with the contact surfaces against each other, and curved rolling surfaces are arranged on the pressure pieces, along which the pressure pieces roll against each other for power transmission, and the pressure member has an end face for frictional contact with a conical pulley of a conical pulley belt drive, characterized in that the end face is configured such that in an upper region of the end face there is contact between the pressure piece and the conical disk in the pressure piece vertical direction.

However, the prior art always has the following disadvantages: in addition to the development of noise and strength, the efficiency and wear of the link chain and the realization of the smallest possible running radius are not sufficient. In the case of a plate link chain, the installation space in the lower chain half is significantly more restricted than in the upper chain half due to the kink kinematics. Thus, the pressure members used to connect links in the lower half of the chain are thinner than at the upper part. However, this has the following disadvantages: due to its reduced cross-section, the lower region of the pressure element is more heavily loaded than the upper region.

Disclosure of Invention

It is therefore an object of the present invention to avoid or at least mitigate the disadvantages of the prior art. In particular, a (rocker) pressure element and a link chain having such a pressure element are to be provided, in which the pressure element is designed such that kinking kinematics can be performed and at the same time a particularly low load on the pressure element is achieved. In particular, an optimum cross-sectional ratio, in particular thickness ratio, of the upper and lower cross-sectional halves of the pressure element should be provided in order to achieve the lowest possible utilization of the pressure element and to keep the installation space of the lateral strap mount sufficiently large.

This object is achieved in a generic device according to the invention in that the ratio of the thickness of the pressure piece between the lower thickness of the part of the pressure piece lying below in the vertical direction and the upper thickness of the part of the pressure piece lying above in the vertical direction, which lower thickness and upper thickness are each measured at a predetermined distance from the center of the pressure piece viewed in the vertical direction and perpendicularly to said vertical direction, is greater than 1/1.09. In other words, the upper thickness is at most 1.09 times the lower thickness.

This has the following advantages: the optimized cross-sectional ratio of the upper and lower pressure piece halves results in a significant reduction of the load on the pressure piece. Thus, the lower part is advantageously provided with a sufficiently high strength. Due to this optimized thickness ratio, the strength of the lower part is only slightly reduced compared to the upper part, so that the pressure element can also be used for transmitting high torques.

Advantageous embodiments are claimed in the dependent claims and are explained below.

Furthermore, it is advantageous if the pressure element has a rolling surface which is symmetrical with respect to a center as viewed in the vertical direction. That is, the height and thickness of the pressure member were measured under the following conditions: the pressure pieces are aligned such that an upper angle is included between the rolling surface of the upper portion and a contour line extending through the center as viewed in the vertical direction and aligned parallel to the vertical direction, and the upper angle corresponds to a lower angle included between the rolling surface of the lower portion and the contour line. That is, when measuring the thickness and the height, the pressure member is oriented such that the rolling surface extends in the upward direction and the downward direction at the same angle with respect to the vertical direction from the center as viewed in the vertical direction.

In a preferred embodiment, the thickness ratio may be less than or equal to 1/1.0, preferably less than 1/1.05. I.e. the depth of the lower part is smaller than the depth of the upper part. Thus, sufficient installation space for the plate link chain to kink even with a small running radius can be obtained.

According to an advantageous development, the predetermined distance can be less than 40% of the total height of the pressure element. Since the thickness is particularly important in the region close to the center, i.e. away from the contact region between the link and the pressure element, it is advisable not to measure the thickness in the outer regions.

It has been found to be preferred that the predetermined distance is 20 to 35% of the total height of the pressure member. The thickness ratio has been shown to be critical especially in this field. A particularly preferred embodiment is one in which the thickness ratio at a distance of about 30% ± 5% of the total height, more preferably at exactly 30% of the total height, is between 1 and 1/1.09, in particular 1/1.071.

It is further advantageous if the cross section of the pressure element is constant over the longitudinal extension of the pressure element. Thus, an optimum thickness ratio is advantageously maintained over the entire width of the plate link chain using the pressure member.

The object of the invention is also achieved by a link chain for a drive train of a motor vehicle, in particular for a continuously variable transmission. A plate link chain has a plurality of links hinged to one another via at least one pressure element engaged in an opening in the link.

In other words, the invention relates to a pressure element having an optimum cross-sectional ratio, in particular thickness ratio, between the upper pressure element half and the lower pressure element half in order to achieve as low a load on the pressure element as possible. The center of the pressure member, viewed in the vertical direction, is determined on the basis of the total height of the pressure member when the pressure member is in a symmetrical position with respect to the rolling side, which center may also be referred to as the geometric center in said vertical direction. In particular, an optimum thickness ratio of the lower portion thickness to the upper portion thickness is obtained in terms of a length of 30% with respect to the total height of the center as viewed in the vertical direction, which is 1:1.0 to 1: 1.09.

Drawings

The invention is explained below with the aid of the figures. In the drawings:

FIG. 1 shows a portion of an exemplary general embodiment of a plate link chain, an

Fig. 2 shows a schematic cross-sectional view of a pressure element of a plate link chain.

Detailed Description

The drawings are merely schematic in nature and are used for understanding the present invention. Like elements are provided with like reference numerals.

Fig. 1 shows a part of an exemplary general embodiment of a plate link chain 1 for a drive train of a motor vehicle. The plate link chain 1 is used in particular for continuously variable transmissions (CVT transmissions). For example, the plate link chain 1 serves as a traction device of a transmission to connect two conical pulley pairs of the transmission to each other. The plate link chain 1 has a large number of links 2, which are referred to below as links 2. The links 2 are arranged parallel to the running direction of the plate link chain 1. The links 2 are arranged in a plurality of rows which are arranged adjacent to each other with respect to the running direction of the plate link chain 1. The links 2 are articulated to each other via rocker arm pressure members 3, which are referred to below as pressure members 3. The pressure element 3 engages in the opening 4 of the link 2 or extends through the opening 4 to connect the links to each other. The pressure element 3 extends transversely to the direction of travel of the plate link chain 1. The pressure element 3 extends over the entire width of the plate link chain 1. The pressure elements 3 connect adjacent strips 2 to each other transversely to the running direction.

The links 2 of one row are offset relative to the links 2 of the other row in the direction of travel of the link plate chain 1, so that the links 2 are connected to one another by means of pressure elements 3 in the direction of travel of the link plate chain 1. The pressure members 3 are each arranged in pairs as pressure member pairs 5. Each link 2 is connected to the link 2 located in front of it in the direction of operation (or to several links 2 located in front of it in the direction of operation) by means of a first pair of pressure elements. Each link 2 is connected to the link 2 located behind it in the direction of operation (or to several links 2 located behind it in the direction of operation) by means of a second pair of pressure elements.

In the non-bent state of the plate link chain 1, the pressure elements 3 of the pressure element pair 5 rest against each other at the rolling point 6. When the plate link chain 1 is guided over a radius and thereby bends, the pressure elements 3 in the pressure element pair 5 roll against each other at the rolling point 6.

Fig. 2 shows a schematic view of a pressure element 3 according to the invention. The design of the pressure element 3 according to the invention is described in more detail with reference to fig. 2.

According to the invention, the thickness ratio of the pressure piece 3 between the lower thickness 7 of the vertically lower portion 8 of the pressure piece 3 and the upper thickness 9 of the vertically upper portion 10 of the pressure piece 3 is greater than 1/1.09. The thicknesses 7, 9 are each measured in the thickness direction of the pressure piece 3 at a predetermined distance 11 from a center 12 of the pressure piece 3, viewed in the vertical direction, and perpendicular to said vertical direction. The vertical direction corresponds to the direction in which the pressure member 3 has the largest extent. This maximum range is measured in particular in a symmetrical position of the pressure member 3, as will be explained in more detail later. The thickness direction of the pressure member 3 is perpendicular to the vertical direction. This means that the centre 12, viewed in the vertical direction, is located at half the height 13 of the total extension 14 in said vertical direction/total height 14. The vertical direction runs parallel to the height profile 15, which is shown in fig. 2. The thickness direction extends parallel to a line of the center 12 viewed in the vertical direction, which is shown in fig. 2.

This means that the upper thickness 9 is at most 1.09 times the lower thickness 7. The ratio of the thickness of the lower thickness 7 to the upper thickness 9 is less than or equal to 1/1. This means that the lower thickness 7 is smaller than the upper thickness 9. Thus, the thickness ratio (lower depth/upper depth) is between 1/1.09 (0.9174) and 1. Since the extension of the pressure piece 3 in the thickness direction varies greatly in the vertical direction, the lower thickness 7 and the upper thickness 9 are each measured at the same distance from the center 12 as viewed in the vertical direction. The thicknesses 7, 9 are measured in particular in regions in which the thicknesses 7, 9 are approximately constant, i.e. in regions which are distant from the contact region between the pressure element 3 and the link 2 in the direction toward the center.

In the present embodiment, the predetermined distance 11 is less than 40% of the total height 14 of the pressure member 3. In particular, the predetermined distance 11 is 20% to 35% of the total height of the pressure member 3. In particular, the predetermined distance is about 30% ± 5%, preferably exactly 30%, of the total height 14.

In the illustrated embodiment, the thickness ratio is less than 1/1.05. More precisely, the thickness ratio at the predetermined distance 11, which is 30% of the total height 14, is 1/1.071. This thickness ratio has proven to be particularly suitable for loading the pressure element 3.

In fig. 2, a cross section of the pressure element 3 is shown. The cross section of the pressure element 3 is constant in the longitudinal extension of the pressure element 3, i.e. constant perpendicular to the cross section.

The pressure piece 3 has a rolling surface 16 with which it rests on a further pressure piece 3, which forms a pressure piece pair 5 with it (see fig. 1). In this case, an upper angle α, which is enclosed between the rolling surface 16 of the upper part 10 and a contour line 15, which extends through the center as viewed in the vertical direction and is aligned parallel to said vertical direction, and a lower angle β, which is comprised between the rolling surface 16 of the lower part 8 and the contour line 15, are formed. In fig. 2, the pressure element 3 is shown in a symmetrical position in which the upper angle α corresponds to the lower angle β. This means that the total height 14, the lower depth 7 and/or the upper depth 9 of the pressure element 3 are measured in a symmetrical position in which the rolling surfaces 16 are symmetrically aligned with respect to the center 12 as seen in the vertical direction.

Description of the reference numerals

1 link chain 2 link 3 pressure 4 opening 5 pressure piece pair 6 rolling point 7 lower thickness 8 lower part 9 upper thickness 10 upper part 11 predetermined part 12 center 13 half height 14 overall height 15 contour line alpha upper angle beta lower angle