Pull-out preventer with cross-connector

Abstract

The invention relates to a hydraulic unit having a hydraulic component, a hydraulic hose, and a pull-out preventer (4). The pull-out preventer (4) has a cable (9), a cross-connector (10), and a tear-off screw (11) and acts on the hydraulic hose in that a loop (12) of the cable (9), the loop being formed by the cross-connector (10), loops around the hydraulic hose. The cross-connector (10) comprises a main part, two transverse passages, namely a first and a second transverse passage, each of which runs transversely to the main part longitudinal axis, and a longitudinal bore, the tear-off screw (11) being screwable into the longitudinal bore (17). The two transverse passages are situated transversely to one another and are offset from one another in the direction of the main part longitudinal axis, and each transverse passage receive a portion of the cable (9). The longitudinal bore opens into the first transverse passage, and the tear-off screw (11) screwed into the longitudinal bore protrudes into the first transverse passage such that the portion of the cable (9) received in the first transverse passage is clamped between the tear-off screw (11) and the wall of the first transverse passage.

Description

[0001] Pull-out protection with cross connector

[0002] The present invention relates to a hydraulic unit comprising a hydraulic component having a hydraulic connection, a hydraulic line connected to the hydraulic connection, and a pull-out protection device. The hydraulic line includes a hydraulic hose and a fitting attached thereto, which is connected to the hydraulic connection of the hydraulic component. The pull-out protection device comprises a cable and engages the hydraulic hose by means of a loop of the cable encircling the hydraulic hose.

[0003] A pull-out protection device can save lives by limiting the consequential damage caused by the hydraulic hose tearing away from the rest of the hydraulic unit.

[0004] A hydraulic line in a hydraulic unit is often subjected to extremely high operating pressures well over 300 bar. If a hydraulic hose tears from the associated hydraulic component (or from the rest of the hydraulic unit) at such pressures, the loose end of the hose whips around at high speed, spraying out hydraulic fluid under high pressure, possibly even hot. Bystanders can be seriously injured by both the whipping hose end and the spraying (hot) hydraulic fluid.

[0005] Even though such accidents are thankfully very rare, it cannot be completely ruled out that a hydraulic hose might tear away from the rest of the hydraulic unit during operation. A pull-out safety device (also called a safety cable) is a simple way to mitigate the risk of a hydraulic hose tearing off.

[0006] A pull-out protection device typically has a (wire) rope which is attached (tied) to both the hydraulic hose and the hydraulic unit or fitting, thus acting on both of these components.

[0007] The anti-tear device is typically attached to the hydraulic hose by means of a rope loop that wraps around the hydraulic hose.

[0008] If the hydraulic hose tears away from the hydraulic unit, the anti-theft device prevents the hydraulic hose from whipping around unhindered, as the radius of movement of the hydraulic hose is limited by the wire rope - similar to a dog on a leash.

[0009] This can limit consequential damage and reduce the risk to life and limb.

[0010] Hydraulic units with pull-out protection devices of the type described above have been in practical use for many years. It has proven advantageous if a pull-out protection device can be installed without having to disconnect the hydraulic hose from the hydraulic component. Furthermore, for safety reasons, a pull-out protection device should be designed in such a way that the probability of incorrect installation is as low as possible and that an installed pull-out protection device cannot be subsequently tampered with.

[0011] Previously known pull-out protection devices differ essentially in the way the rope loop, by means of which the connection to the hydraulic hose is made, is formed and fixed.

[0012] European patent EP 4 078 003 B1, filed by the applicant, describes a pull-out protection device in which a rope loop is formed by first threading two sections of wire rope parallel to each other into a clamping block. Subsequently, a rivet is driven between the two parallel wire rope sections perpendicular to their longitudinal extent, thereby clamping the wire rope sections in the clamping block and fixing (securing) the rope loop.

[0013] The pull-out protection device described in US patent US 11,116,27 B1 also uses a clamping block that can accommodate two parallel wire rope sections. However, the wire rope sections are not clamped in the block with a rivet, but rather with a setscrew.

[0014] European patent application EP 2 867 559 A1 describes a locking device for a rope loop used to secure a cable. To simplify assembly and reduce installation time, the device is proposed to have both a locking sleeve and a tensioning sleeve, with the two rope sections of the loop being securely locked in the locking sleeve to prevent displacement. To ensure the rope loop is securely locked onto the cable, the locking device is designed to allow for retensioning of the rope loop.

[0015] German patent application DE 10 2013 004 326 A describes a device for forming a loop from a rope. The device has a guide sleeve with a first bore for passing through a first rope section. The guide sleeve also has a second bore with a first and a second bore section, the second bore section being expanded in diameter compared to the first bore section for inserting and receiving an end-stop sleeve of a second rope section. Furthermore, rope securing devices are provided to lock the end-stop sleeve (260) at the end of the second rope section in the second expanded bore section of the second bore.

[0016] Against the background of this prior art, the present invention is based on the objective of providing a hydraulic unit with a pull-out protection of the type described above, which is characterized by improved practicality, in particular with regard to reliability, economy and the simplest possible assembly.

[0017] This problem is solved by the hydraulic unit according to the invention as per claim 1. Particularly advantageous embodiments are listed in the dependent subclaims.

[0018] The hydraulic unit according to the invention comprises a hydraulic component having a hydraulic connection, a hydraulic line connected to the hydraulic connection and a pull-out protection device, wherein

[0019] The hydraulic line comprises a hydraulic hose and a fitting attached thereto, which is connected to the hydraulic port of the hydraulic component; the pull-out protection comprises a rope, a cross connector and a shear bolt and engages the hydraulic hose by means of a rope loop formed by the cross connector that encircles the hydraulic hose; the cross connector comprises a base body with a longitudinal axis, two transverse openings extending perpendicular to the longitudinal axis of the base body, namely a first transverse opening and a second transverse opening, and a longitudinal bore extending parallel to the longitudinal axis of the base body; the longitudinal bore has an internal thread which meshes with an external thread of the shear bolt, so that the shear bolt can be screwed into the longitudinal bore.the two transverse penetration passages are arranged perpendicular to each other and offset from each other in the direction of the longitudinal axis of the base body and each accommodates a section of the rope, so that the rope loop is formed between the two sections of the rope accommodated in the transverse penetration passages,

[0020] the longitudinal bore opens into the first transverse passage and the shear bolt screwed into the longitudinal bore protrudes into the first transverse passage, thus clamping the section of the rope received in the first transverse passage between the shear bolt and a wall of the first transverse passage.

[0021] The invention is based on the realization that, through the synergistic combination of the features according to the invention, a hydraulic unit with a pull-out protection can be realized which is characterized by a number of advantages which, taken together, lead to improved practical suitability:

[0022] Enabling a defined clamping of the rope in the cross connector and preventing subsequent manipulation by means of a shear screw.

[0023] The rope inserted into the first transverse penetration is clamped between the breakaway bolt screwed into the longitudinal bore and the wall of the first transverse penetration, thus preventing the rope from slipping through the first transverse penetration. In this way, the rope is fixed in the first transverse penetration, and consequently, so is the length of the rope loop encircling the hydraulic hose.

[0024] A shear bolt has a screw-in area with an external thread and a screw drive and is designed such that the screw drive shears off from the rest of the shear bolt as soon as a defined shear torque (transferred from the screw drive to the rest of the bolt) is reached.

[0025] Once the screw drive has been removed in this way, the screw can no longer be loosened with a normal wrench or screwdriver, which makes subsequent manipulation of the screw connection more difficult.

[0026] By using a shear bolt to clamp the rope in the first transverse passage, it can be ensured in an extremely simple way that, on the one hand, a defined minimum clamping force is exerted on the rope by the shear bolt (since only then is the shear torque reached and the screw drive breaks off) and, on the other hand, subsequent manipulation of the shear bolt is made more difficult, since the shear bolt can only be loosened again with the complex use of special tools.

[0027] Improved fixation of the hydraulic hose due to the large size

[0028] about the angle of twist

[0029] According to the invention, the rope is threaded through the two transverse openings of the cross connector to form the rope loop. This rope guidance makes it possible to guide the rope very close to the hydraulic hose over a large section of its circumference, which is also referred to as a large wrap angle. In this way, the hydraulic hose can be effectively secured in the rope loop, and slippage of the torn hydraulic hose during whipping is prevented or at least reduced, which benefits reliability and functionality.

[0030] Assembly using readily available standard tools

[0031] The shear bolt can be installed in the cross connector using a conventional screwdriver or wrench. Special tools, the use of which always increases the risk of incorrect installation, are not necessary. This facilitates the proper installation of the inventive pull-out devices on-site in the field.

[0032] Use of standard components

[0033] Both cross connectors and shear bolts (or at least related semi-finished products) can be obtained as standard parts at high quality and cost-effectively. The pull-out protection system according to the invention can therefore be provided very economically.

[0034] The following explains and defines some terms used in connection with the invention:

[0035] The phrase "the hydraulic hose is joined to the fitting" indicates that the hydraulic hose is permanently connected to the fitting, specifically by crimping the hydraulic hose to the fitting using a radial press. The phrase "the fitting is connected to the hydraulic port" indicates that the fitting is connected to the hydraulic port, thus establishing a hydraulic connection between the hydraulic hose and the hydraulic component. The fitting and the hydraulic port are designed as a nipple (plug) and a socket, respectively, and therefore form a (hydraulic) coupling.

[0036] The anti-tear device engages the hydraulic hose by means of a rope loop, which wraps around the hydraulic hose.

[0037] The two transverse openings each extend through the cross connector and can each be designed as a through hole or as a slot.

[0038] The orientation and extent of the transverse openings are each determined by an associated transverse opening passage axis, along which the respective transverse opening extends.

[0039] A transverse penetration passage designed as a through-hole is also referred to as a transverse bore and is defined by the axis of the associated bore, the transverse bore axis. The transverse bore axis coincides with the transverse penetration axis.

[0040] Alternatively, a transverse opening can also be part of a transverse slot that extends through the base body along the transverse slot axis. The transverse slot axis coincides with the transverse opening axis. The statement that the two transverse openings are arranged transversely to each other and offset from each other in the direction of the base body's longitudinal axis indicates that the two transverse openings do not intersect and that their axes are skew to each other.

[0041] The formulation that the transverse penetration passages are arranged transversely to each other expresses the fact that the transverse penetration passage axes in their projection in the direction of the longitudinal axis of the base body do not run parallel to each other, but enclose an angle of 90° + / - 60°, in particular of 90° + / - 30° or 90° + / - 10°, with each other.

[0042] Similarly, the formulation that the transverse penetration passages run perpendicular to the longitudinal axis of the base body expresses that the transverse penetration passage axes do not run parallel to the longitudinal axis of the base body, but rather form an angle of 90° + / - 60° with it, in particular 90° + / - 30° or 90° + / - 10°.

[0043] The formulation that the longitudinal bore runs along the longitudinal axis of the base body expresses that the longitudinal axis of the longitudinal bore does not run perpendicular to the longitudinal axis of the base body, but rather forms an angle of 0° + / - 45° with it, in particular 0° + / - 30° or 0° + / - 10°.

[0044] The longitudinal axis of the cross connector's base body defines the direction of its longitudinal extension. For a cylindrical base body, this axis coincides with the cylinder axis. For a cuboid base body, the longitudinal axis runs parallel to the four longest edges of the cuboid, passing through its center of gravity. The statement that the section of rope inserted into the first transverse opening is clamped between the breakaway bolt and a wall of that opening indicates that, during normal operation, this section of rope is secured (fixed) against displacement relative to the cross connector.

[0045] According to a first particularly advantageous embodiment of the inventive hydraulic unit

[0046] The inner diameter of the second transverse opening passage can be reduced by means of a radial press by pressing the base body, and

[0047] With a reduced inner diameter of the second transverse passage, the section of the rope received in the second transverse passage becomes jammed between the walls of the second transverse passage.

[0048] In this way, a pull-out protection system can be implemented with only three components: the rope, the cross connector and the pull-out screw.

[0049] According to this embodiment, the cross connector fulfills a dual function:

[0050] Firstly, the section of rope received in the second transverse passage is fixed in the second transverse passage by pressing this rope section in the second transverse passage (especially using a radial press).

[0051] Secondly, the rope loop is formed using the cross connector by taking another section of the rope into the first transverse passage and clamping it there between the breakaway screw and the cross connector.

[0052] This way, the effort required to manufacture the pull-out protection can be reduced.

[0053] When a hydraulic line needs to be replaced as part of a repair, a new fitting is often crimped onto a new hydraulic hose on-site using a mobile radial press. Given this, the mobile radial press – which is already on-site – can then also be used to securely and permanently crimp the section of cable, which was installed in the second transverse penetration, to the cross connector.

[0054] By pressing the section of rope received in the second transverse breakthrough passage in the second transverse breakthrough passage or in the cross connector, this section of the rope can no longer be moved relative to the cross connector and is thus fixed there.

[0055] Alternatively or additionally, it may be provided that the pull-out protection has a crimp sleeve which can be crimped onto the rope on the side of the cross connector facing away from the rope loop using a radial press, and

[0056] The crimp sleeve pressed onto the rope prevents it from slipping through the second transverse penetration passage by means of a positive locking mechanism.

[0057] Because the crimped ferrule prevents slippage through the second transverse opening by means of a positive locking mechanism, the maximum length of the rope loop can be limited. The maximum length of the rope loop refers to the maximum length of the rope extending between the sections of rope that are accommodated in the two transverse openings.

[0058] It is advantageous if the inner diameter of the second transverse opening passage is smaller in an inner area of ​​the base body than in an outer area of ​​the base body.

[0059] The inner diameter of the second transverse penetration passage in the edge region of the base body is dimensioned in particular such that it can (at least partially) accommodate the crimp sleeve pressed onto the rope, while the inner diameter of the second transverse penetration passage in the inner region of the base body is dimensioned such that the crimp sleeve pressed onto the rope is prevented from penetrating into the inner region of the base body by means of a positive fit, thus preventing the rope with the crimp sleeve pressed onto it from slipping through the second transverse penetration passage.

[0060] According to another particularly advantageous embodiment of the invention

[0061] Is the first transverse penetration passage designed as a through-hole or does the first transverse penetration passage form part of a transverse slot, and / or

[0062] Is the second transverse passage designed as a through-hole or does the second transverse passage form part of a second transverse slot?

[0063] It is particularly advantageous that the first and second transverse penetration passages are each designed as a through-bore and have a transverse bore axis, and

[0064] the transverse bore axes are arranged perpendicular to each other and perpendicular to the longitudinal axis of the base body, and / or

[0065] the longitudinal bore has a longitudinal bore axis that is arranged parallel to the longitudinal axis of the base body.

[0066] In this way, a cross connector that is particularly easy to manufacture and at the same time very stable can be realized.

[0067] Alternatively, it may be provided that

[0068] the first transverse breakthrough passage forms part of a first transverse slot and has a transverse slot axis along which the first transverse breakthrough passage extends, and

[0069] the second transverse penetration passage is designed as a through bore and has a transverse bore axis, and

[0070] the transverse slot axis and the transverse bore axis are arranged perpendicular to each other and each perpendicular to the longitudinal axis of the base body, and / or

[0071] the longitudinal bore has a longitudinal bore axis that is arranged parallel to the longitudinal axis of the base body.

[0072] Unwanted slippage of the rope through the first transverse passage can be prevented even more effectively by making a section of the wall of the first transverse passage, against which the section of the rope held there is clamped by the screwed-in breakaway screw, ribbed and / or having a circular segment, v-shaped or u-shaped profile.

[0073] The grooved design of the wall section of the first transverse passage, against which the rope is jammed, increases the frictional force between the rope and the wall section.

[0074] A similar effect can be achieved by ensuring that the wall section has a V-shaped profile, so that the rope is wedged between the opposing flanks of the “V” which converge at an acute angle.

[0075] This way, unwanted widening of the rope loop can be prevented even more effectively.

[0076] The manufacturing of the cross connector can be further simplified if the base body of the cross connector is cylindrical and the longitudinal axis of the base body is identical to the cylinder axis of the cylindrical cross connector.

[0077] According to a further advantageous embodiment, the first transverse opening passage in the area of ​​the shell of the base body may have a radius or a chamfer.

[0078] This prevents the cable from being weakened—especially when the breakaway device is limiting the whipping action of the severed hydraulic line—by being bent with great force along a sharp edge at the opening of the first transverse penetration. The known shear bolt used in the hydraulic unit typically has an externally threaded insertion section and a bolt head with a screw drive. The screw drive is typically designed as an external drive, e.g., an external hexagon. The external thread of the insertion section corresponds to the internal thread of the bore into which the insertion section is to be screwed. If a defined shear torque is transferred from the screw drive to the rest of the bolt head or the shear bolt, the screw drive shears off from the rest of the bolt head in a shear plane.The outer diameter of the remaining screw head, which remains at the screw-in area after the screw drive has broken off, is typically larger than the outer diameter of the external thread of the screw-in area.

[0079] However, the inventors have realized that a particularly advantageous hydraulic unit can be achieved by using a novel shear bolt.

[0080] The novel shear bolt described below constitutes an independent invention, separate from its specific application in a hydraulic unit according to the invention. The patent applicant therefore reserves the right to file a separate patent application for the novel shear bolt.

[0081] The novel shear bolt (with a cylindrical bolt body) comprises

[0082] a cylindrical screw-in area provided with an external thread (fully countersunk in a bore), a screw head with a screw drive, and a circumferential groove adjacent to the cylindrical screw-in area on one side and the screw head on the other, wherein

[0083] Upon reaching a shear torque transmitted from the screw head to the insertion area, the screw head shears off from the insertion area in a shear plane running within the groove, and

[0084] The outer diameter of the external thread of the cylindrical screw-in area defines the maximum outer diameter of the shear bolt.

[0085] The outer diameter of the threaded section of the cylindrical screw-in area determines the maximum outer diameter of the entire shear bolt, including the bolt head. The (maximum) outer diameter of the bolt head is therefore less than or equal to the outer diameter of the threaded section of the cylindrical screw-in area.

[0086] In this way, a shear bolt can be created which, after the bolt head has been separated from the insertion area (and thus from the rest of the shear bolt) in the shear plane, can be completely countersunk in a corresponding threaded hole (bore with internal thread). The shear plane or insertion area therefore does not protrude beyond the threaded hole, but is located entirely within the threaded hole or at least flush with the opening of the threaded hole.

[0087] The depth of the threaded hole, the axial extent of the insertion area, and the axial extent of the groove (groove width) must be coordinated in such a way that, when the screw head shears off the rest of the shear bolt, the insertion area is already fully screwed into and countersunk in the threaded hole, while the screw head still protrudes completely from the threaded hole. The shear plane is thus recessed in the threaded hole and therefore does not protrude beyond it in an exposed manner, which further complicates subsequent manipulation (i.e., loosening) of the shear bolt – especially compared to previously known shear bolts, where a "residual screw head" typically protrudes from the hole after the screw drive shears off.

[0088] In this context, the maximum outer diameter of the screw head is understood to be the largest outer diameter of the screw head relative to the initial axial extension of the shear bolt. If the screw head has a cylindrical base body, the maximum outer diameter of the screw head corresponds to the outer diameter of the cylindrical base body.

[0089] The cylindrical screw-in area has a cylindrical basic shape over its entire axial extent.

[0090] According to a preferred embodiment of the novel shear bolt

[0091] The screw drive is designed as an internal drive, in particular as an internal hexagon (Allen key), as a Phillips head, as a slotted head, as a Torx or as a spline drive, and

[0092] The screw head has a cylindrical screw head body and is provided with an external thread.

[0093] where the outer diameter of the external thread of the screw head is equal to the outer diameter of the external thread of the screw-in area.

[0094] Such a shear bolt can be manufactured in a particularly simple way from a (cut-to-length) cylindrical threaded rod (with an external thread): For this purpose, a groove is machined into the threaded rod, thus separating the screw-in area from the bolt head. In addition, the internal drive is created in the bolt head, e.g., by cold forming or pressing.

[0095] Preferably, the groove extends axially along a longitudinal axis of the shear bolt along a groove width and radially to the longitudinal axis of the shear bolt along a groove depth, wherein the groove depth varies along the groove width and, in particular, the groove depth in a region of the groove adjacent to the screw-in area is greater than in a region of the groove adjacent to the screw head.

[0096] The shear bolt has its smallest outer diameter at the point of greatest groove depth. Since the material thickness is therefore minimal at this point, this is where the shear bolt's predetermined breaking point, or shear plane, is located. By varying the groove depth along the groove width, the position of the shear plane within the groove can be defined more precisely. If the groove depth is maximum in the area of ​​the groove adjacent to the screw-in area, then the shear plane is also located at the corresponding point.

[0097] Such a novel shear bolt can be used to a particularly advantageous extent in a preferred embodiment of the hydraulic unit according to the invention.

[0098] According to this preferred embodiment of the hydraulic unit according to the invention, the shear bolt (used therein) comprises a cylindrical screw-in area provided with an external thread, a screw head with a screw drive, and a circumferential groove adjacent to the cylindrical screw-in area on one side and the screw head on the other, wherein

[0099] Upon reaching a shear torque transmitted from the screw head to the insertion area, the screw head shears off from the insertion area in a shear plane running within the groove, and

[0100] The outer diameter of the external thread of the cylindrical screw-in area defines the maximum outer diameter of the shear bolt.

[0101] In a particularly advantageous way, when a shear bolt is screwed into the longitudinal bore and the screw head has broken off, the screw-in area is arranged completely within the longitudinal bore.

[0102] In this way, it can be achieved that subsequent loosening of the shear bolt is made even more difficult, which benefits the tamper resistance of the pull-out protection or the entire hydraulic unit.

[0103] Further preferred

[0104] The screw drive is designed as an internal drive, in particular as an internal hexagon, as a Phillips head, as a slotted head, as a Torx or as a spline drive,

[0105] The screw head has a cylindrical screw head body and an external thread, and the outer diameter of the external thread of the screw head is equal to the outer diameter of the external thread of the screw-in area.

[0106] Furthermore, it may be provided that the pull-out protection engages the fitting or the hydraulic component.

[0107] The pull-out protection can engage the fitting or the hydraulic component by engaging it with another loop of the rope, whereby this additional loop is formed analogously to the loop engaging the hydraulic hose by means of another cross connector and another breakaway screw.

[0108] Alternatively, the pull-out protection can also engage the fitting or the hydraulic component in other ways.

[0109] In the following, exemplary embodiments of the invention will be explained in more detail with reference to the drawing. The drawing shows

[0110] Fig. 1A shows a first hydraulic unit according to the invention with a pull-out protection device in a schematic top view,

[0111] Fig. IB & IC show the pull-out protection according to Fig. 1A in a schematic side view, Fig. 2A shows a cross connector of a hydraulic unit according to the invention in three different views,

[0112] Fig. 2B shows a cross connector with a screwed-in shear bolt (without screw drive) in two different side views,

[0113] Fig. 2C shows a cross connector with a screwed-in shear bolt (with screw drive) in two different sectional views,

[0114] Fig. 2D shows a cross connector with a rope pressed into the second transverse opening,

[0115] Figs. 3A – 3C show a cross connector of another hydraulic unit according to the invention in a perspective oblique view (Fig. 3A), two side views (Fig. 3B) and two sectional views (Fig. 3C),

[0116] Figs. 4A & 4B show an independently inventive shear bolt in a perspective oblique view (Fig. 4A) and a side view (Fig. 4B), and Figs. 5A - 5C show a shear bolt comprising the cross connector according to Figs. 3A - 3B and the shear bolt according to Figs. 4A & 4B in perspective oblique views.

[0117] With reference to Figures 1A to IC, the general structure of a hydraulic unit 1 according to the invention is first explained, before a first embodiment is discussed in detail with reference to Figures 2A to 2D and a second embodiment of a pull-out protection according to the invention is discussed in detail with reference to Figures 3A to 5C.

[0118] The hydraulic unit 1 according to the invention comprises a hydraulic component 2, a hydraulic line 3 and a pull-out protection device 4.

[0119] The hydraulic line 3 comprises a hydraulic hose 5 and a fitting 6 crimped to it. The hydraulic component 2 has a hydraulic connection 7.

[0120] The fitting 6 of the hydraulic line 3 and the hydraulic connection 7 of the hydraulic component 2 form two parts of a coupling 8, with the help of which the hydraulic line 3 can be detachably connected to the hydraulic component 2.

[0121] The pull-out protection 4 comprises a (wire) rope 9 as well as two cross connectors 10, 10.1, 10.2 and two shear bolts 11, 11.1, 11.2. Each cross connector 10 and one shear bolt 11 form and fix a rope loop 12, 12.1, 12.2 of the rope.

[0122] The first cross connector 10.1 and the first shear bolt 11.1 form the first cable loop 12.1, which encircles the hydraulic hose 5 and thus engages it. The second cross connector 10.2 and the second shear bolt 11.2 form the second cable loop 12.2, which encloses the hydraulic connection 5 in the area of ​​a circumferential groove 13 and thus engages it.

[0123] Both cross connectors 10 and both shear bolts 11 are identical in design. To improve readability, the following descriptions will refer to the cross connector and the shear bolt in the singular, although the descriptions apply to both components.

[0124] The detailed construction of the cross connector 10 and the shear bolt 11 is described below with reference to a first embodiment shown in Figures 2A to 2D and a second embodiment shown in Figures 3A to 5C.

[0125] The design of the pull-out protection is described.

[0126] Fig. 2A shows a cross connector 10 of a hydraulic unit 1 according to the invention in two side views and one top view. Figures 2B and 2C show the cross connector with a shear bolt screwed into it. According to the two side views in Fig. 2B, the screw drive 13 of the shear bolt 11 has already sheared off from the rest of the bolt or the rest of the bolt head. In the two sectional views according to Fig. 2C, the screw drive 13 of the shear bolt 11 is still connected to the rest of the bolt. Fig. 2D shows a cross connector 10 with a cable crimped in the second transverse opening.

[0127] The cross connector 10 has a cylindrical base body 14 with a longitudinal axis 15 of the base body that coincides with the axis of the cylinder. A longitudinal bore 17 is arranged centrally on one end face 16 of the cross connector 10, running parallel (and thus longitudinally) to the longitudinal axis 15 of the base body of the cable clamp 10. The longitudinal bore 17 has an internal thread 18 which meshes with an external thread 19 of the shear bolt 11, so that the shear bolt 11 can be screwed into the longitudinal bore 17.

[0128] The cross connector 10 further comprises two transverse through-holes 20, each perpendicular to the longitudinal axis 15 of the base body, namely the first transverse through-hole 20.1 and the second transverse through-hole 20.2, which are designed as through-holes and are also referred to as transverse bores 21. The transverse bore axes 22 coincide with the transverse through-hole axes 23 and define the position and orientation of the transverse bores 21.

[0129] The two transverse bores 21 are arranged perpendicular to each other and offset from each other in the direction of the longitudinal axis 15 of the base body, so that the transverse bore axes 22 run skew to each other.

[0130] The two transverse bores 21 each receive a section of the rope 9, so that a rope loop 12 is formed between the two sections of the rope 9 received in the transverse bores 21, which encircles the hydraulic hose or the hydraulic connection.

[0131] The longitudinal bore 17 opens into the first transverse penetration passage 20.1, which is designed as a transverse bore 21. When the shear bolt 11 is screwed into the longitudinal bore 17, the shear bolt 11 projects into the first transverse penetration passage 20.1 and clamps the section of the cable 9 received in the first transverse penetration passage 20.1 between a wall of the first transverse penetration passage 20.1 and the shear bolt 11. The screw drive 13 of the shear bolt 11 is designed as an external hexagon and breaks off from the rest of the bolt (or from the rest of the bolt head) as soon as a defined shear torque (transmitted from the screw drive 13 to the rest of the bolt) is reached. The shear bolt 11 and thus also the shear torque is designed in such a way that when the shear torque is reached, the desired clamping force is transferred from the shear bolt 11 to the jammed rope 9.

[0132] The section of cable 9 taken up in the second transverse passage 20.2 can be pressed between the walls of the second transverse passage using a radial press.

[0133] For this purpose, the cable 9 is first inserted into the second transverse opening 20.2, which is designed as a transverse bore 21, and then the inner diameter 24 of the transverse bore is reduced by radially pressing and tapering the base body 14 of the cross connector 10 in the area of ​​the second transverse opening 20.2 using the radial press. As shown schematically in Fig. 2D, the cable 9 is thereby clamped between the opposing walls of the transverse bore (or the second transverse opening) with the reduced inner diameter 24 and thus fixed there.

[0134] With reference to Figures 3A to 5C, the second embodiment of the pull-out protection device of a hydraulic unit according to the invention, as depicted therein, will be described in more detail below. The focus will be primarily on the differences between the pull-out protection device according to Figures 3A to 5C and the pull-out protection device according to Figures 2A to 2D. Identical or similar elements of the pull-out protection device according to Figures 3A to 5C are designated by the reference numerals already introduced.

[0135] The cross connector 10 shown in Figures 3A to 3C has a cylindrical base body 14, two transverse opening passages 20 and a longitudinal bore 17.

[0136] The first transverse opening passage 20.1 is part of a first transverse slot 25.1 and extends along a first transverse opening passage axis 23.1, which coincides with the transverse slot axis of the first transverse slot 25.1. The first transverse slot 23.1 is bordered by two opposing slot flanks 26.

[0137] The longitudinal bore 17 has an internal thread 18 and extends along a base body longitudinal axis 15, which coincides with the cylinder axis of the cylindrical base body 14.

[0138] The longitudinal bore 17 is partially located within the first transverse slot 23.1. The internal thread 18 of the longitudinal bore is therefore not continuous, but rather located on the two opposing slot flanks 26 and interrupted in the area of ​​the first transverse slot 23.

[0139] The longitudinal bore 17 is suitable for receiving a shear bolt with a corresponding external thread and has a longitudinal bore shoulder 27 on its end face.

[0140] The longitudinal bore 17 opens into the first transverse penetration passage 20.1. In the area of ​​the shell of the base body, the first transverse penetration passage 20.1 has a radius 28 on both sides. The second transverse penetration passage 20.2 extends along a second transverse penetration passage axis 23.2 and is designed as a transverse bore 21 (through bore). The axis of the through bore (transverse bore axis 22) coincides with the second transverse penetration passage axis 23.2.

[0141] The transverse bore 21 has a transverse bore shoulder 29 on both sides in the area of ​​its openings. This ensures that the inner diameter of the second transverse opening passage 20.2 is smaller in an inner region of the base body 14 than in an outer region (shell region) of the base body 14.

[0142] Figures 4A and 4B show the independently inventive shear bolt 11, which can be used within the framework of the inventive hydraulic unit.

[0143] The shear bolt 11 was made from a cut-to-length threaded rod and has a screw-in area 30, a screw head 31 with a screw drive 32 and a circumferential groove 33 adjacent to the screw-in area 30 on one side and the screw head 31 on the other.

[0144] The screw-in section 30 and the screw head 31 are each cylindrical and provided with an external thread 34, wherein the outer diameter of the external thread 34 of the screw head 31 is equal to the outer diameter of the external thread of the screw-in section 30. The outer diameter of the external thread of the cylindrical screw-in section 30 thus defines the maximum outer diameter of the entire shear bolt 11.

[0145] The screw drive 32 in the screw head 31 is designed as an internal hexagon (Allen key). The groove 33 extends axially to the longitudinal axis 35 of the shear bolt 11 along a groove width and radially to the longitudinal axis 35 of the shear bolt 11 along a groove depth. The groove depth varies along the groove width and is greater in a region of the groove 33 adjacent to the screw-in area 30 than in a region of the groove 33 adjacent to the screw head 31.

[0146] The shear bolt has its smallest outer diameter at the point of greatest groove depth. A shear plane 38 of the shear bolt 11 is located at this point. When a shear torque transmitted from the bolt head 31 to the insertion area 30 is reached, the bolt head 31 shears off from the insertion area 30 in the shear plane 38 running within the groove 33.

[0147] The shear bolt 11 according to Figures 4A and 4B is dimensioned such that the external thread of the shear bolt 11 corresponds to the internal thread 18 of the longitudinal bore 17 of the cross connector 10 according to Figures 3A to 3C, so that the shear bolt 11 can be screwed into the longitudinal bore 17.

[0148] Figures 5A to 5C each show a pull-out protection device 4 comprising the cross connector 10 according to Figures 3A to 3B and the pull-out screw 11 according to Figures 4A & 4B in perspective oblique views.

[0149] A crimp sleeve 39 is pressed onto one end of the rope 9. The crimp sleeve 39 is dimensioned such that it partially penetrates the second transverse opening 20.2, but there it engages positively with the transverse bore shoulder 29, thus preventing it from slipping through the second transverse opening 20.2. With the shear bolt 11 not yet screwed into the longitudinal bore 17, a section of the rope 9, located behind the rope loop 12, is threaded between the two slot flanks 26 into the first transverse slot 25.1 and thus into the first transverse opening 20.1. The shear bolt 11 is then screwed into the longitudinal bore 17. The screw-in area 30 of the shear bolt 11 projects into the first transverse penetration passage 20.1 and clamps the section of the rope 9 located there between the shear bolt 11 and a wall 40 of the first transverse penetration passage 20.1, which has a circular segment-shaped profile.

[0150] The axial extent of the screw-in area 30 and the groove width of the shear bolt are matched to the depth of the longitudinal bore 17 and the diameter of the cable 9 such that, upon reaching the desired screw-in depth of the shear bolt or upon reaching the desired shear bolt torque, the shear bolt surface 38 of the shear bolt 11 is located within the cross connector 10 and does not project beyond the end face 41 of the cross connector 10. Reference numeral list

[0151] Hydraulic unit 1 Hydraulic component 2 Hydraulic line 3

[0152] Pull-out protection 4 Hydraulic hose 5

[0153] Fitting 6 Hydraulic connection 7

[0154] Clutch 8

[0155] (Wire) rope 9

[0156] Cross connector 10, 10.1, 10.2 Shear bolt 11, 11.1, 11.2 Rope loop 12, 12.1, 12.2 Screw drive 13 Base body 14 Base body longitudinal axis 15 End face 16 Longitudinal bore 17 Internal thread 18 External thread 19 Transverse passage 20, 20.1, 20.2 Transverse bores 21 Transverse bore axis 22 Transverse passage axis 23, 23.1 Inner diameter 24 Transverse slot 25.1 Slot flank 26 Longitudinal bore shoulder 27

[0157] Radius 28 Cross bore shoulder 29 Screw-in area 30 Screw head 31 Screw drive 32

[0158] Groove 33 External thread 34 Longitudinal axis 35 Tear-off plane 38 Press sleeve 39 Wall 40 End face 41

Claims

1. Claims 1. Hydraulic unit ( 1 ) with a hydraulic component ( 2 ) having a hydraulic connection ( 7 ), a hydraulic line ( 3 ) connected to the hydraulic connection ( 7 ) and a pull-out protection device ( 4 ), wherein 3. the hydraulic line ( 3 ) has a hydraulic hose ( 5 ) and a fitting ( 6 ) joined thereto, which is connected to the hydraulic port ( 7 ) of the hydraulic component ( 2 ), 4. the pull-out protection ( 4 ) comprises a rope ( 9 ), a cross connector ( 10 ) and a breakaway screw ( 11 ) and engages the hydraulic hose ( 5 ) by forming a rope loop ( 12 ) of the rope ( 9 ) through the cross connector ( 10 ) around the hydraulic hose ( 5 ), 5. the cross connector ( 10 ) has a base body ( 14 ) with a base body longitudinal axis ( 15 ), two transverse opening passages ( 20 ) each running transversely to the base body longitudinal axis ( 15 ), namely a first transverse opening passage ( 20. 1 ) and a second transverse opening passage ( 20. 2 ), and a longitudinal bore ( 17 ) running longitudinally to the base body longitudinal axis ( 15 ), 6. The longitudinal bore (17) has an internal thread (18) which meshes with an external thread (19) of the shear bolt (11), so that the shear bolt (11) can be screwed into the longitudinal bore (17), the two transverse openings (20) are arranged transversely to each other and offset from each other in the direction of the longitudinal axis (15) of the base body and each accommodate a section of the rope (9), so that the rope loop (12) is formed between the two sections of the rope (9) accommodated in the transverse openings (20), the longitudinal bore (17) opens into the first transverse opening (20.1), and the shear bolt (11) screwed into the longitudinal bore (17) opens into the first transverse opening (20.1). protrudes into and thus the section of the rope (9) taken into the first transverse passage (20.1) is jammed between the breakaway screw (11) and a wall (40) of the first transverse passage (20.1).

2. Hydraulic unit ( 1 ) according to claim 1, wherein 8. an inner diameter ( 24 ) of the second transverse opening passage ( 20. 2 ) can be reduced by means of a radial press by pressing the base body ( 14 ), and 9. with a reduced inner diameter ( 24 ) of the second transverse passage ( 20. 2 ), the section of the rope ( 9 ) received in the second transverse passage ( 20. 2 ) is jammed between walls of the second transverse passage ( 20. 2 ).

3. Hydraulic unit ( 1 ) according to one of the preceding claims, wherein 11. the pull-out protection ( 4 ) has a crimp sleeve ( 39 ) which can be crimped onto the rope on the side of the cross connector ( 11 ) facing away from the rope loop ( 12 ) by means of a radial press, and 12. the crimp sleeve ( 39 ) pressed onto the rope ( 9 ) prevents the crimp sleeve ( 39 ) from slipping through the second transverse opening passage ( 20. 2 ) by means of positive locking.

13. Hydraulic unit ( 1 ) according to one of the preceding 14. Claims, wherein an inner diameter ( 24 ) of the second transverse passage ( 20. 2 ) in an inner region of the base body ( 14 ) is smaller than in an outer region of the base body ( 14 ).

5. Hydraulic unit ( 1 ) according to one of the preceding claims, wherein 16. the first transverse opening passage ( 20. 1 ) is designed as a through hole or forms part of a transverse slot ( 25. 1 ), and / or the second transverse opening passage ( 20. 2 ) is designed as a through hole or forms part of a second transverse slot.

6. Hydraulic unit ( 1 ) according to claim 5, wherein 18. the first and the second transverse penetration passage ( 20. 1, 20. 2 ) are each designed as a transverse bore ( 21 ) and have a transverse bore axis ( 22 ), and the transverse bore axes ( 22 ) are each perpendicular to each other and each perpendicular to the longitudinal axis ( 15 ) of the base body, and / or the longitudinal bore ( 17 ) has a longitudinal bore axis that is arranged parallel to the longitudinal axis ( 15 ) of the base body.

7. Hydraulic unit ( 1 ) according to claim 5, wherein 20. the first transverse opening passage ( 20. 1 ) forms part of a first transverse slot ( 25. 1 ) and has a transverse slot axis along which the first transverse opening passage ( 20. 1 ) extends, and the second transverse opening passage ( 20. 2 ) is designed as a through hole and has a transverse hole axis, and the transverse slot axis and the transverse hole axis are arranged perpendicular to each other and perpendicular to the longitudinal axis ( 15 ) of the base body, and / or the longitudinal hole ( 17 ) has a longitudinal hole axis which is arranged parallel to the longitudinal axis ( 15 ) of the base body.

8. Hydraulic unit (1) according to one of the preceding claims, wherein a section of the wall (40) of the first transverse penetration passage (20.1), against which the there 22. the section of rope ( 9 ) that has been clamped by the screwed-in breakaway screw ( 11 ), is ribbed and / or a 23. has a circular segment-shaped, v-shaped or u-shaped profile.

9. Hydraulic unit ( 1 ) according to one of the preceding claims, wherein the base body ( 14 ) of the cross connector ( 10 ) is cylindrical and the base body longitudinal axis ( 15 ) is identical to the cylinder axis of the cylindrical cross connector ( 10 ).

10. Hydraulic unit ( 1 ) according to one of the preceding claims, wherein the first transverse opening passage ( 20. 1 ) in the area of ​​the shell of the base body ( 14 ) has a radius ( 28 ) or a chamfer.

11. Hydraulic unit ( 1 ) according to one of the preceding claims, wherein 27. the shear bolt ( 11 ) comprises a cylindrical screw-in area ( 30 ) provided with an external thread ( 34 ), a bolt head ( 31 ) with a screw drive ( 32 ), and a circumferential groove ( 33 ) adjacent to the cylindrical screw-in area ( 32 ) on one side and the bolt head ( 31 ) on the other, upon reaching a shear torque transmitted from the bolt head ( 31 ) to the screw-in area ( 30 ), the bolt head ( 31 ) shears off from the screw-in area ( 30 ) in a shear plane ( 38 ) extending within the groove ( 33 ), and 28. the outer diameter of the external thread ( 34 ) of the cylindrical screw-in area ( 30 ) defines the maximum outer diameter of the shear bolt ( 11 ).

12. Hydraulic unit ( 1 ) according to claim 11, wherein, with the shear bolt ( 11 ) screwed into the longitudinal bore ( 17 ) and with the bolt head ( 31 ) sheared off, the screw-in area ( 30 ) is arranged completely within the longitudinal bore ( 17 ).

13. Hydraulic unit ( 1 ) according to claim 11 or 12, wherein the screw drive ( 32 ) is designed as an internal drive, in particular as an internal hexagon, as a cross recess, as a slot, as a Torx or as a spline drive, 31. the screw head ( 31 ) has a cylindrical screw head body and an external thread ( 34 ), and 32. the outer diameter of the external thread ( 34 ) of the screw head ( 31 ) is equal to the outer diameter of the external thread of the screw-in area ( 30 ).

14. Hydraulic unit ( 1 ) according to one of the preceding claims, wherein the pull-out protection ( 4 ) engages the fitting ( 6 ) or the hydraulic component ( 2 ).

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