Connecting rod, particularly for the stator of a turbomachine, adjustable in length

Abstract

Connecting rod (100), particularly for the stator of a turbomachine, extending along an axis of extension comprising a connecting rod body (110) and a first connecting rod head connected to the connecting rod body (110) and comprising a cylindrical connecting rod (131) having an external thread (132). The connecting rod (100) further comprising an axial length adjustment system along the axis of extension of the first connecting rod head (130) relative to the connecting rod body (110) comprising a sleeve (141) rotatably mounted in the connecting rod body (110) and comprising an internal thread (141b) cooperating with the external thread (132) and a transmission member (143), and a drive member (144) comprising a complementary transmission member (147) intended to cooperate with the transmission member (143) in an engaged position. Figure for the abridged version: [Fig 4]

Description

Title of the invention: Connecting rod, particularly for the stator of a turbomachine, adjustable in length. Technical field of the invention

[0001] The present invention relates to the field of turbomachine engines comprising a motion transmission element between two moving mechanical parts.

[0002] More particularly, the invention relates to a connecting rod or connecting rod preferably mounted on an element of the turbomachine stator, in particular a connecting rod connected to a discharge valve, called a "variable bleed valve", acronym VBV in Anglo-Saxon terms, of a discharge duct of a turbomachine, whose role is to regulate the flow at the inlet of a compressor of the turbomachine, or a connecting rod connected to a stator or variable-pitch stator vane, acronym VSV in Anglo-Saxon terms.

[0003] The invention also relates to a so-called pitch control connecting rod capable of transmitting the displacements of a swashplate to blade sleeves of the turbomachine.

[0004] In general, the connecting rod according to the invention is mounted in all kinematic systems of the turbomachine where a cylinder must transmit movement to mechanical parts. Prior art

[0005] Connecting rods used in kinematic systems are usually adjustable in length by relative rotation between the body and the head, or between the two heads when there are two. The connecting rod length adjustment must also be lockable to prevent any misalignment of the connecting rod length during operation.

[0006] An example of a connecting rod 1 is illustrated in [Fig. 1]. The connecting rod 1 comprises a connecting rod body 11 and two connecting rod heads 12a, 12b which are rotationally fixed to the connecting rod body 11.

[0007] The connecting rod body 11 includes on its internal surface, an internal tapping or thread (not visible in the figures) opening onto each of the open ends lia, 11b of said connecting rod body 11.

[0008] The internal thread of the connecting rod body 11 cooperates by screwing with an external thread 13a, 13b provided on the corresponding connecting rod head 12a, 12b.

[0009] As illustrated, each connecting rod head 12a, 12b includes a cylindrical connecting rod 14a, 14b, extending along the extension axis X-X' and comprising, on its external surface, the external thread 13a, 13b.

[0010] Each connecting rod head 12a, 12b further includes an end portion 15a, 15b extending from the corresponding connecting rod 14a, 14b in two opposite directions and each comprising a bore 16a, 16b extending along the transverse axis Y, perpendicular to the extension axis X-X'.

[0011] Each connecting rod head 12a, 12b further includes a joint 17a, 17b mounted in said corresponding bore 16a, 16b.

[0012] The connecting rod 1 thus allows to transmit or transform a movement between two moving mechanical parts.

[0013] Preferably, one of the external threads 13a has a right-hand thread and the other of the external threads 13b has a right-hand thread. This allows the connecting rod heads 12a, 12b to be moved away from the connecting rod body 11 by rotating said connecting rod body 11.

[0014] Indeed, thanks to the cooperation between the internal thread of the connecting rod body 11 and the external thread 13a, 13b of each connecting rod head 12a, 12b, the length along the extension axis X-X' of the connecting rod 1 can be adjusted by relative rotation between the corresponding connecting rod head 12a, 12b and the connecting rod body 11.

[0015] The connecting rod 1 further includes a system 20a, 20b for locking the relative rotation between each connecting rod head 12a, 12b and the connecting rod body 11.

[0016] Each locking system 20a, 20b includes a first serrated washer 21a, 21b mounted radially around the connecting rod 14a, 14b of the associated connecting rod head 12a, 12b.

[0017] The first notched washer 21a, 21b is axially delimited by a first lateral surface (not referenced) provided with an axial lug 22a, 22b extending axially along the extension axis X-X' towards the connecting rod body 11 and by a second lateral surface (not referenced) comprising a plurality of axial notches regularly distributed on the surface of said second lateral surface.

[0018] The axial lug 22a, 22b of the first toothed washer 21a, 21b is intended to cooperate with an axial notch 1 the made on the connecting rod body 11.

[0019] When the axial lug 22a, 22b of the first toothed washer 21a, 21b is inserted into the axial notch 1 associated with the connecting rod body 11, said first toothed washer 21a, 21b is blocked from rotation relative to the connecting rod 14a, 14b.

[0020] Each locking system 20a, 20b includes a second serrated washer 23a, 23b mounted radially around the corresponding connecting rod 14a, 14b of the associated connecting rod head 12a, 12b. The first serrated washer 21a, 21b is mounted axially between the connecting rod body 11 and the second serrated washer 23a, 23b.

[0021] The second notched washer 23a, 23b is axially delimited by a first lateral surface (not referenced) comprising a plurality of axial notches (not referenced) regularly distributed on the surface of said first lateral surface and cooperating with the notches of the first notched washer 21a, 21b and by a second lateral surface (not referenced) substantially flat.

[0022] Each locking system 20a, 20b further includes a lock nut 24a, 24b screw-mounted on the connecting rod 14a, 14b of the corresponding connecting rod head 12a, 14b and configured to clamp the toothed washers 21a, 21b, 23a, 23b against each other, engaging the respective notches, as well as the axial lug 22a, 22b in the corresponding notch 1 provided on the connecting rod body 11 and blocking the relative rotation between the connecting rod body 11 and the corresponding connecting rod head 12a, 12b.

[0023] It is known to block the rotation of the lock nut by a cable 26, visible on [Fig.1A], to prevent the relative rotation of the body 10 and the head of the corresponding connecting rod 12a, 12b and thus the misalignment of the axial length of the connecting rod.

[0024] Cable 26 is also known as "brake wire".

[0025] However, such a system for locking the relative rotation of the body and the head of the connecting rod is difficult to implement because of the short cable length, which makes it difficult to control the cable tension.

[0026] Moreover, no keying prevents the cable from being put in backwards, thus locking the tightening instead of the loosening.

[0027] Finally, such a locking system is not satisfactory when subjected to a centrifugal force generated by the rotation of the stator of a turbomachine.

[0028] Furthermore, when adjusting the length of such connecting rods, it is necessary to loosen the two anti-rotation nuts, release the serrated washers, and hold them in the unlocked position in order to be able to work on the connecting rod body. Such operations can prove tricky when the connecting rods are located in confined spaces.

[0029] There is a need to improve the systems for adjusting the axial length of the head of a connecting rod or link. Description of the invention

[0030] The present invention therefore aims to overcome the aforementioned drawbacks.

[0031] The aim of the invention is therefore to propose a system for adjusting the axial length of an accessible connecting rod head, while allowing the axial position of the connecting rod head to be maintained both in an environment subjected to centrifugal force and in an environment subjected to strong vibrations.

[0032] The invention relates to a connecting rod or connecting rod, in particular of a stator or rotor of a turbomachine, extending along an axis of extension, for example axial, and comprising a connecting rod body and a first connecting rod head connected to the connecting rod body and comprising a cylindrical connecting rod, extending along the axis of extension and comprising, on its external surface, an external thread.

[0033] The connecting rod further includes an axial length adjustment system along the extension axis of the first connecting rod head relative to the connecting rod body.

[0034] The adjustment system comprises: - a sleeve mounted for rotation within the connecting rod body and blocked against translation relative to said connecting rod body by an axial retaining member, said sleeve comprising an internal thread cooperating with the external thread of the first connecting rod head and a transmission member, and - a drive element comprising a first end including a housing, for example parallelepiped, for example square, intended to cooperate with an external tool of corresponding shape and a second end comprising a complementary transmission element.

[0035] Said drive member is movable in translation relative to the connecting rod body along a second axis perpendicular to the extension axis between a disengaged position in which the complementary transmission member does not cooperate with the transmission member of the sleeve and an engaged position in which the complementary transmission member cooperates with the transmission member of the sleeve and in which the relative rotation of the drive member with respect to the connecting rod body around said second axis is permitted.

[0036] In other words, the axial length between the connecting rod head and the connecting rod body is adjustable by relative rotation between the connecting rod head and the sleeve.

[0037] By "length" we mean the dimension of the connecting rod along its axis of extension.

[0038] The sleeve being connected by screwing to the connecting rod of the first connecting rod head, said first connecting rod head is moved in translation relative to said sleeve.

[0039] In order to generate such a translational movement, the connecting rod of the first connecting rod head is blocked in rotation relative to the connecting rod body by a rotation blocking device, for example a key, axial notches, or even by simple retention on an external mechanical part on which the connecting rod is mounted.

[0040] When an external tool, such as a ratchet wrench, is inserted into the parallelepiped housing of the drive member, pressure from the operator causes the said drive member to translate along the second axis, which engages the transmission member, in particular the axial teeth, of the sleeve and drives the said sleeve in rotation.

[0041] Thanks to the cooperation between the internal thread of the sleeve and the external thread of the first connecting rod head, the length along the extension axis of the first connecting rod head can be adjusted by relative rotation between said first connecting rod head and the sleeve.

[0042] The connecting rod thus allows to transmit or transform a movement between two moving mechanical parts.

[0043] Advantageously, the adjustment system includes a guide shaft extending along the second axis and an elastic return element, such as for example a return spring, mounted partly around the guide shaft.

[0044] Advantageously, the drive member includes in addition a bore in which the guide shaft is mounted and a housing for receiving the elastic return member.

[0045] The elastic return member allows the drive member to return to the disengaged position when said drive member is not subjected to translational stress by an external tool.

[0046] When the external tool is removed, the return spring disengages the transmission parts, in particular the teeth, and moves the said drive part in translation along the second axis into the disengaged position.

[0047] For example, the length adjustment system further includes a spacer mounted radially around the drive member and ensuring a stable position of said drive member in the disengaged position.

[0048] Preferably, the length adjustment system further includes a system for maintaining the first connecting rod head in axial position relative to the sleeve.

[0049] For example, the axial positioning system includes an elastomeric material part mounted between the external surface of the first connecting rod head and the internal surface of the sleeve, preferably housed in an axial groove made in the threads of the connecting rod of the first connecting rod head.

[0050] This axial support is necessary to ensure that the position of the first connecting rod head is precisely maintained during operation, when the length adjustment system is in the disengaged position.

[0051] For example, the transmission member is a toothed wheel provided with a plurality of axial teeth spaced circumferentially from each other by axial spaces, and in which the complementary transmission member is a toothed wheel provided with a plurality of radial teeth spaced circumferentially from each other by spaces, in the engaged position, the radial teeth come to be interposed in an axial space between two axial teeth of the transmission member and thus transmit a rotational movement to the sleeve.

[0052] The axial retaining member is, for example, an annular circlip cooperating both with an annular groove provided on the sleeve and with an annular groove provided on the connecting rod body.

[0053] Alternatively, any mechanical device for axially retaining the sleeve relative to the connecting rod body could be provided.

[0054] The first connecting rod head may further include an end portion extending from the connecting rod on the side opposite the connecting rod body and comprising a bore extending along a transverse axis, perpendicular to the axis of extension and a first articulation mounted in said bore.

[0055] The first joint can be a ball joint or a pivot.

[0056] According to one embodiment, the connecting rod comprises a second connecting rod head comprising a cylindrical connecting rod, extending along the axis of extension and comprising, on its external surface, a second external thread, an end portion extending from the connecting rod on the side opposite the connecting rod body and comprising a bore extending along a transverse axis, perpendicular to the axis of extension and a second joint mounted in said bore.

[0057] The second joint can be a ball joint or a pivot.

[0058] According to one embodiment, the second connecting rod head is fixed relative to the connecting rod body.

[0059] According to another aspect, the invention relates to a turbomachine comprising a connecting rod as described above. Brief description of the drawings

[0060] Other objects, features and advantages of the invention will become apparent from the following description, given solely by way of non-limiting example, and made with reference to the indexed drawings in which:

[0061] [Fig.l], is a partial schematic view of a connecting rod in a locked position of the relative rotation between the body and the head of the connecting rod, according to the prior art;

[0062] [Fig.l A], is a detailed view of [Fig.1], illustrating a rotating locking cable of the brake nut;

[0063] [Fig.2], is a partial schematic view of a connecting rod in a disengaged position of a drive element in translation of the head of the connecting rod relative to the body of the connecting rod, according to an embodiment of the invention;

[0064] [Fig.3], is a detailed view of the connecting rod of [Fig.2];

[0065] [Fig.4], the connecting rod of [Fig.2] in an engaged position of the drive member in translation of the connecting rod head relative to the connecting rod body; and

[0066] [Fig.5] is a view from below of [Fig.4], illustrating a system for maintaining the connecting rod head in axial position.

[0067] Detailed description of at least one embodiment

[0068] In the following description, we consider an orthonormal basis X, Y, Z, with X corresponding to an axis of extension or elongation in which we find:

[0069] - a longitudinal axis X, horizontal;

[0070] - a horizontal transverse axis Y, perpendicular to the longitudinal axis X; and

[0071] - a vertical axis Z, orthogonal to the longitudinal axis X and transverse axis Y and extending from bottom to top in figures 1 to 4.

[0072] In the following description, the terms "axial" and "radial" are defined with respect to the extension axis Xl-Xl' of a connecting rod or link 100.

[0073] By "connecting rod" or "connecting rod" we mean any device for transmitting movement between two moving mechanical parts.

[0074] In general, the invention relates to any connecting rod configured to be adjustable in length and to be mounted in all kinematic systems of a turbomachine, in particular a turbomachine stator.

[0075] As illustrated, the connecting rod 100 comprises a connecting rod body 110 and, here, a first connecting rod head 130 and a second connecting rod head 120, each connected to the connecting rod body 110.

[0076] The connecting rod body 110 comprises a body 111 extending axially along the extension axis Xl-Xl' and having a first end 112 attached to the second connecting rod head 120 and a second end 113 connected to the first connecting rod head 130.

[0077] The first end 112 of the connecting rod body 111 is open and includes on its internal surface, a second internal tapping or thread (not visible in the figures) opening onto the first open end 112.

[0078] The second internal thread of the connecting rod body 111 engages by screwing with an external thread 121 provided on the second connecting rod head 120. A rotational and translational locking element (not visible) is disposed between the second internal thread of the connecting rod body 110 and the external thread 121 provided on the second connecting rod head 120. For example, the locking element is threaded locking compound. Alternatively, the second connecting rod head 120 could be fitted into the first open end 112 of the connecting rod body 110. Generally, the second connecting rod head 120 is fixed to the connecting rod body 110, that is, it has no relative movement with respect to said connecting rod body 110.

[0079] The second end 113 of the connecting rod body 110 is open and includes on its internal surface, a bore 114 opening onto the second open end 113.

[0080] As illustrated, the second connecting rod head 120 includes a cylindrical connecting rod 122, extending along the extension axis Xl-Xl' and comprising, on its external surface, the second external thread 121.

[0081] The second connecting rod head 120 further comprises an end portion 123 extending from the connecting rod 122 on the side opposite the connecting rod body 110 and including a bore 124 extending along the transverse axis Y, perpendicular to the extension axis Xl-Xl'.

[0082] The second connecting rod head 120 further includes a second joint 125 mounted in said bore 124.

[0083] The second joint 125 can be a ball joint or a pivot.

[0084] As illustrated, the first connecting rod head 130 includes a cylindrical connecting rod 131, extending along the extension axis Xl-Xl' and comprising, on its external surface, an external thread 132.

[0085] The first connecting rod head 130 further includes an end portion 133 extending from the connecting rod 131 on the opposite side of the connecting rod body 110 and including a bore 134 extending along the transverse axis Y, perpendicular to the extension axis Xl-Xl'.

[0086] The first connecting rod head 130 further includes a first articulation 135 mounted in said bore 134.

[0087] The first joint 135 can be a ball joint or a pivot.

[0088] The connecting rod 100 thus allows to transmit or transform a movement between two moving mechanical parts.

[0089] The connecting rod 100 further includes a system 140 for adjusting the length of the first connecting rod head 130 relative to the connecting rod body 110.

[0090] As illustrated, the length adjustment system allows adjustment of the axial length only of the first connecting rod head 130.

[0091] The system 140 for adjusting the length of the first connecting rod head 130 relative to the connecting rod body 110 comprises a sleeve 141 including a cylindrical part 141a mounted in the bore 114 of the connecting rod body 110 and including on its inner surface, a tapping 141b cooperating with the external thread 132 of the connecting rod 131 of the first connecting rod head 130.

[0092] The cylindrical portion 141a includes at a first end 141c, an annular groove 14Id cooperating with an axial retaining element 142 of the sleeve 141 relative to the connecting rod body 110. The axial retaining element 142 is, for example, an annular circlip cooperating both with the annular groove 141d provided on the sleeve 141 and with an annular groove (not visible) provided on the connecting rod body 110. Alternatively, any mechanical axial retaining element of the sleeve 141 relative to the connecting rod body 110 could be provided.

[0093] Thus, the sleeve 141 has a pivot joint, i.e., mobile in rotation, relative to the connecting rod body 110.

[0094] The sheath 141 further comprises, at a second end, opposite the first end 141c, a transmission element 143, here a toothed wheel equipped with a plurality of axial teeth 143a spaced circumferentially from each other by axial spaces 143b.

[0095] The length adjustment system 140 further includes a drive member 144 comprising a first end 145 comprising a parallelepiped housing 145 a, here square, intended to cooperate with a tool of corresponding shape.

[0096] The drive member 144 includes a second end 146 comprising a complementary transmission member 147 intended to cooperate with the transmission member 143 in an axial length adjustment position of the first connecting rod head 130, visible in [Fig.4], in other words the engaged position.

[0097] The complementary transmission member 147 is here a toothed wheel provided with a plurality of radial teeth 147a spaced circumferentially from each other by spaces 147b.

[0098] In the engaged position or axial length adjustment position, the radial teeth 147a come to be interposed in an axial space 143b between two axial teeth 143a of the transmission member 143 and thus transmit a rotational movement to the sleeve 141.

[0099] The sleeve 141 being connected by screwing to the connecting rod 131 of the first connecting rod head 130, said first connecting rod head 130 is moved in translation relative to said sleeve 141.

[0100] In order to generate such a translational movement, the connecting rod 131 of the first connecting rod head 130 is blocked in rotation relative to the connecting rod body 110 by a rotation blocking device (not shown), for example a key, axial notches, or even by simple retention on an external mechanical part.

[0101] The drive member 144 includes in addition a bore 144a cooperating with a guide shaft 148 extending along the vertical axis Z.

[0102] An elastic return member 149, such as a spring, is mounted around the guide shaft 149 in a housing 144b provided in the bore 114a of the drive member 144. The elastic return member 149 allows the drive member 144 to return to the disengaged position when said drive member 144 is not subjected to translational stress by an external tool.

[0103] The length adjustment system 140 further includes a spacer 150 mounted radially around the drive member 144 and ensuring a stable position of said drive member in the disengaged position.

[0104] The drive member 144 is movable in translation along the vertical axis Z relative to the connecting rod body 110 and in rotation around said vertical axis Z relative to the connecting rod body 110. The drive member 144 is in a so-called "sliding pivot" connection with said connecting rod body 110.

[0105] When an external tool, such as a ratchet wrench, is inserted into the parallelepiped housing 145a of the drive member 144, pressure from the operator causes the drive member 144 to translate along the vertical axis Z, which engages the axial teeth 143a of the sleeve 141 and rotates the sleeve 141. Thanks to the cooperation between the internal thread 141b of the sleeve 141 and the external thread 132 of the first connecting rod head 130, the length along the extension axis XI-XI' of the first connecting rod head 130 can be adjusted by relative rotation between the first connecting rod head 130 and the sleeve 141.

[0106] When the external tool is removed, the return spring 149 disengages the teeth 143a, 147a, and moves the said drive member 144 in translation along the vertical axis Z into the disengaged position.

[0107] The length adjustment system 140 further includes a system 160 for maintaining the first connecting rod head 130 in axial position relative to the sleeve 141.

[0108] The axial positioning system 160 here comprises an elastomeric material part 161 mounted between the external surface of the first connecting rod head 130 and the internal surface of the sleeve 141, preferably housed in an axial groove 162 made in the threads of the connecting rod 131 of the first connecting rod head 130.

[0109] The axial holding power can be modulated by playing on the length of the brake, i.e. the number of threads in contact, on the width of the brake, as well as on the hardness and nature of the elastomer.

[0110] This axial support is necessary to ensure that the position of the first connecting rod head 130 is precisely maintained during operation, when the length adjustment system 140 is in the disengaged position.

[0111] The advantages of the present invention include the offset position of the connecting rod length adjustment system.

Claims

Demands

1. A connecting rod (100), particularly a stator rod of a turbomachine, extending along an axis of extension (XI-XI') comprising a connecting rod body (110) and a first connecting rod head (130) connected to the connecting rod body (110) and comprising a cylindrical connecting rod (131) extending along the axis of extension (XI-XI') and comprising, on its external surface, an external thread (132), the connecting rod (100) further comprising an axial length adjustment system (140) about the axis of extension (XI-XI') of the first connecting rod head (130) relative to the connecting rod body (110), characterized in that the adjustment system (140) comprises: - a sleeve (141) rotatably mounted in the connecting rod body (110) and blocked against translation relative to said connecting rod body (110) by an axial retaining element (142), said sleeve (141) comprising an internal thread (141b) cooperating with the external thread (132) of the first connecting rod head (130) and a transmission element (143),- a drive member (144) comprising a first end (145) including a housing (145a) intended to cooperate with an external tool of corresponding shape and a second end (146) including a complementary transmission member (147), said drive member (144) being movable in translation relative to the connecting rod body (110) along a second axis (Z) perpendicular to the extension axis (X1-XT) between a disengaged position in which the complementary transmission member (147) does not cooperate with the transmission member (143) of the sleeve (141) and an engaged position in which the complementary transmission member (147) cooperates with the transmission member (143) of the sleeve (141) and in which the relative rotation of the drive member (144) with respect to the connecting rod body (110) around said second axis (Z) is permitted.

2. Connecting rod (100) according to claim 1, wherein the adjustment system (140) comprises a guide shaft (148) extending along the second axis (Z) and an elastic return member (149) mounted partly around the guide shaft (149), and wherein the drive member (144) comprises in addition a bore (144a) in which the guide shaft (148) is mounted and a housing (144b) for receiving the elastic return member (149).

3. Connecting rod (100) according to claim 1 or 2, wherein the length adjustment system (140) further comprises a spacer (150) mounted radially around the drive member (144).

4. Connecting rod (100) according to any one of the preceding claims, wherein the length adjustment system (140) further comprises a system (160) for maintaining the first connecting rod head (130) in axial position relative to the sleeve (141).

5. Connecting rod (100) according to claim 4, wherein the axial positioning system (160) comprises an elastomeric material part (161) mounted between the external surface of the first connecting rod head (130) and the internal surface of the sleeve (141), preferably housed in an axial groove (162) made in the threads of the connecting rod (131) of the first connecting rod head (130).

6. Connecting rod (100) according to any one of the preceding claims, wherein the transmission member (143) is a gear wheel having a plurality of axial teeth (143a) spaced circumferentially from each other by axial spaces (143b), and wherein the complementary transmission member (147) is a gear wheel having a plurality of radial teeth (147a) spaced circumferentially from each other by spaces (147b), in the engaged position, the radial teeth (147a) are interposed in an axial space (143b) between two axial teeth (143a) of the transmission member (143).

7. Connecting rod (100) according to any one of the preceding claims, wherein the axial retaining member (142) is an annular circlip cooperating both with an annular groove (141d) provided on the sleeve (141) and with an annular groove provided on the connecting rod body (110).

8. Connecting rod (100) according to any one of the preceding claims, wherein the first connecting rod head (130) further comprises an end portion (133) extending from the connecting rod (131) on the side opposite the connecting rod body (110) and comprising a bore (134) extending along a transverse axis (Y), perpendicular to the extension axis (X1-XT) and a first joint (135) mounted in said bore (134).

9. Connecting rod (100) according to any one of the preceding claims, comprising a second connecting rod head (120) comprising a cylindrical connecting rod (122), extending along the extension axis (XI-

10.

11. XI') and comprising, on its external surface, a second external thread (121), an end part (123) extending from the connecting rod (122) on the side opposite the connecting rod body (110) and comprising a bore (124) extending along a transverse axis (Y), perpendicular to the extension axis (XI-XI') and a second articulation (125) mounted in said bore (124). Connecting rod (100) according to claim 9, wherein the second connecting rod head (120) is fixed relative to the connecting rod body (110). Turbomachine comprising a connecting rod (100) according to any one of the preceding claims.

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