Stator wire locking structure

Abstract

A stator wire locking structure comprises a positioning cover, at least one tight plugging block and at least one first locking piece, the positioning cover is provided with an accommodating groove for accommodating a stator wire, at least one repair welding hole and at least one first locking hole, the repair welding hole and the first locking hole are communicated with the accommodating groove, the repair welding hole and the first locking hole are correspondingly arranged, the tight plugging block is detachably installed in the repair welding hole, and the first locking piece is detachably installed in the first locking hole. The repair welding hole is divided into a plurality of sub repair welding holes, the first locking piece is detachably connected to the first locking hole, a first gap for clamping a stator wire is formed between the end of the first locking piece and the side wall of the plugging block, the width of the first gap can be changed by adjusting the first locking piece, and the first gap corresponds to the sub repair welding holes. The stator wire locking structure can improve the production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of stator wire welding, and particularly relates to a stator wire locking structure. Background Art

[0002] After laser standard welding of stator wires, there are many points that cannot be welded, and repair welding is required later. Currently, manual use of pliers or other tooling is used to clamp the stator wires that need to be repaired, and all the stator wires that need to be repaired need to be clamped once, which not only has a high labor intensity but also a low repair welding efficiency. Content of the Utility Model

[0003] In view of this, the utility model provides a stator wire locking structure, which can improve production efficiency.

[0004] A stator wire locking structure includes a positioning cover, at least one plugging block, and at least one first locking member. The positioning cover is provided with a receiving groove for receiving the stator wire, at least one repair welding hole and at least one first locking hole communicated with the receiving groove. The repair welding hole and the first locking hole are correspondingly arranged. The plugging block is detachably installed in the repair welding hole and divides the repair welding hole into multiple sub-repair welding holes. The first locking member is detachably connected to the first locking hole. A first gap for clamping the stator wire is formed between the end of the first locking member and the side wall of the plugging block. Adjusting the first locking member can change the width of the first gap. The first gap is correspondingly arranged with the sub-repair welding holes.

[0005] In an embodiment of the utility model, the positioning cover is further provided with at least one second locking hole communicated with the receiving groove, and the second locking hole is correspondingly arranged with the repair welding hole; the stator wire locking structure further includes at least one second locking member, and the second locking member is detachably connected to the second locking hole. A second gap for clamping the stator wire is formed between the end of the second locking member and the side wall of the plugging block. Adjusting the second locking member can change the width of the second gap. The second gap is correspondingly arranged with the sub-repair welding holes.

[0006] In an embodiment of the utility model, the first locking hole and the second locking hole are both threaded holes, and the first locking member and the second locking member are both provided with threads. The first locking member is connected to the first locking hole through thread fit, and the second locking member is connected to the second locking hole through thread fit.

[0007] In an embodiment of the utility model, at least two of the plugging blocks can be installed in the repair welding hole, and a third gap for clamping the stator wire is formed between two adjacent plugging blocks. The first gap, the second gap, and the third gap are respectively correspondingly arranged with three of the sub-repair welding holes.

[0008] In an embodiment of the present utility model, the positioning cover is in an annular shape, and the positioning cover includes an outer ring plate, an inner ring plate, and an annular top plate. The outer ring plate and the inner ring plate are oppositely arranged, the annular top plate is fixed between the outer ring plate and the inner ring plate, and an accommodation groove is formed among the outer ring plate, the annular top plate, and the inner ring plate. The repair welding hole penetrates through the annular top plate, the first locking hole penetrates through the outer ring plate, and the second locking hole penetrates through the inner ring plate.

[0009] In an embodiment of the present utility model, a plurality of the repair welding holes are provided on the positioning cover. The plurality of repair welding holes are arranged at intervals around the central axis of the positioning cover, and the length direction of each repair welding hole is arranged along the radial direction of the positioning cover.

[0010] In an embodiment of the present utility model, a plurality of the first locking holes are provided on the positioning cover, and each repair welding hole and each first locking hole are arranged in one-to-one correspondence.

[0011] In an embodiment of the present utility model, a plurality of the second locking holes are provided on the positioning cover, and each repair welding hole and each second locking hole are arranged in one-to-one correspondence.

[0012] In an embodiment of the present utility model, the stator wire locking structure includes a plurality of the plugging blocks, a plurality of the first locking members, and a plurality of the second locking members.

[0013] In an embodiment of the present utility model, the stator wire locking structure further includes a positioning seat. The positioning cover is connected to the positioning seat, and the positioning seat is used for sleeving on the stator.

[0014] In an embodiment of the present utility model, the positioning seat includes a bearing portion and a blocking portion. The bearing portion includes an upper surface connecting the positioning cover and a lower surface connecting the blocking portion. When the positioning seat is sleeved on the stator, the lower surface of the bearing portion contacts the end face of the stator, and the blocking portion contacts or is adjacent to the side face of the stator.

[0015] In an embodiment of the present utility model, the repair welding hole includes a first hole wall and a second hole wall arranged oppositely. At least one first clamping groove is provided on the first hole wall, and at least one second clamping groove is provided on the second hole wall. The plugging block is provided with a first clamping block and a second clamping block. When the plugging block is installed in the repair welding hole, the first clamping block is arranged in the first clamping groove, and the second clamping block is arranged in the second clamping groove.

[0016] In an embodiment of the present utility model, the above-mentioned plugging block includes a locking section and a guiding section. Both sides of the head of the locking section are respectively connected to the first clamping block and the second clamping block. The tail of the locking section is connected to the guiding section. The width and / or thickness of the guiding section gradually decreases in a direction away from the locking section.

[0017] The stator wire locking structure of the present utility model can lock and fix only the stator wires that need to be repaired by soldering, without locking all stator wires, with low labor intensity, and can ensure that the stator wires that need to be repaired by soldering can be locked in the first gap in one operation, greatly improving production efficiency. This application can squeeze the stator wires that need to be repaired by soldering through the first locking member to eliminate the gap between two stator wires, which is beneficial to improving the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of the stator wire locking structure according to the first embodiment of the present application.

[0019] Figure 2 is a sectional structural schematic diagram of the stator wire locking structure according to the first embodiment of the present application.

[0020] Figure 3 is a three-dimensional structural schematic diagram of the stator wire locking structure according to the first embodiment of the present application provided on the stator.

[0021] Figure 4 is Figure 3 a sectional structural schematic diagram of the stator wire locking structure and the stator shown in the figure.

[0022] Figure 5 is a three-dimensional structural schematic diagram of the positioning cover according to the first embodiment of the present application.

[0023] Figure 6 is Figure 5 a partial enlarged structural schematic diagram of the positioning cover shown in the figure.

[0024] Figure 7 is a three-dimensional structural schematic diagram of the plugging block according to the present application.

[0025] Figure 8 is a front view structural schematic diagram of the plugging block according to the present application.

[0026] Figure 9 is a structural schematic diagram of the first locking member or the second locking member according to the second embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following specific embodiments illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification.

[0028] In the following description, reference is made to the accompanying drawings, which illustrate several embodiments of the present application. It should be understood that other embodiments may also be used, and mechanical components, structures, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered restrictive, and the terms used herein are only for describing specific embodiments and are not intended to limit the present application.

[0029] Although in some instances the terms first, second, etc. are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0030] Furthermore, as used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should be further understood that the terms "comprising", "including" indicate the presence of the features, steps, operations, elements, components, items, kinds, and / or groups, but do not preclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". An exception to this definition occurs only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some manner.

[0031] First Embodiment

[0032] Figure 1 is a schematic perspective view of the stator wire locking structure according to the first embodiment of the present application, Figure 2 is a schematic cross-sectional view of the stator wire locking structure according to the first embodiment of the present application, Figure 3 is a schematic perspective view of the stator wire locking structure disposed on the stator according to the first embodiment of the present application, Figure 4 is Figure 3 the schematic cross-sectional view of the stator wire locking structure and the stator shown in, please refer to Figures 1 to 4, the stator wire locking structure includes a positioning cover 12, at least one plugging block 13 and at least one first locking member 14. The positioning cover 12 is provided with a receiving groove 101 for receiving the stator wire 20, at least one repair welding hole 102 and at least one first locking hole 103 communicating with the receiving groove 101. The repair welding hole 102 and the first locking hole 103 are correspondingly arranged. The plugging block 13 is detachably installed in the repair welding hole 102 and divides the repair welding hole 102 into multiple sub-repair welding holes. The first locking member 14 is detachably connected to the first locking hole 103. A first gap 1011 for clamping the stator wire 20 is formed between the end of the first locking member 14 and the side wall of the plugging block 13. Adjusting the first locking member 14 can change the width of the first gap 1011, and the first gap 1011 is correspondingly arranged with the sub-repair welding holes.

[0033] When it is necessary to repair weld the stator wire 20 of the stator 30, cover the positioning cover 12 on the stator wire 20 of the stator 30 and make all the stator wires 20 located in the receiving groove 101, and the stator wire 20 exposes from the repair welding hole 102; identify the stator wire 20 that needs to be repaired welded, and install the plugging block 13 in the corresponding repair welding hole 102; then install the first locking member 14 in the corresponding first locking hole 103, and adjust the first locking member 14 so that its end presses the stator wire 20 until the stator wire 20 is pressed and locked in the first gap 1011; finally, use a laser welder to repair weld the stator wire 20 in the sub-repair welding hole.

[0034] When only one repair welding hole 102 is provided on the positioning cover 12, identify the stator wire 20 that needs to be repaired welded, cover the positioning cover 12 correspondingly on the stator wire 20 and make the stator wire 20 that needs to be repaired welded expose from the repair welding hole 102; then install the plugging block 13 in the repair welding hole 102; then install the first locking member 14 in the first locking hole 103, and adjust the first locking member 14 so that its end presses the stator wire 20 until the stator wire 20 is pressed and locked in the first gap 1011; finally, use a laser welder to repair weld the stator wire 20 in the sub-repair welding hole.

[0035] The stator wire locking structure of the present application can lock and fix only the stator wire 20 that needs to be repaired welded, without locking all the stator wires 20, with low labor intensity, and can ensure that the stator wire 20 that needs to be repaired welded can be locked in the first gap 1011 in one operation, greatly improving the production efficiency. The present application can press the stator wire 20 that needs to be repaired welded through the first locking member 14 to eliminate the gap between two stator wires 20, which is beneficial to improving the welding quality.

[0036] Optionally, Figure 5 is a schematic three-dimensional structure diagram of the positioning cover of the first embodiment of the present application, Figure 6 is Figure 5 the partial enlarged structure diagram of the positioning cover shown in, as Figure 2 、Figure 5 and Figure 6 As shown in Figure 6 , the positioning cover 12 is further provided with at least one second locking hole 104 communicating with the accommodating groove 101, and the second locking hole 104 is correspondingly arranged with the repair welding hole 102; the stator wire locking structure further includes at least one second locking member 15, the second locking member 15 is detachably connected to the second locking hole 104, and a second gap 1012 for clamping the stator wire 20 is formed between the end of the second locking member 15 and the side wall of the plugging block 13. Adjusting the second locking member 15 can change the width of the second gap 1012, and the second gap 1012 is correspondingly arranged with the sub-repair welding hole. When the stator wire 20 is in the accommodating groove 101, the stator wire 20 that needs to be repaired is identified, and the plugging block 13 is installed in the corresponding repair welding hole 102. At this time, the plugging block 13 divides the repair welding hole 102 into two sub-repair welding holes. Then, the first locking member 14 is installed in the corresponding first locking hole 103, and the first locking member 14 is adjusted to squeeze and lock a bundle of stator wires 20 in the first gap 1011. Finally, the second locking member 15 is installed in the corresponding second locking hole 104, and the second locking member 15 is adjusted to squeeze and lock another bundle of stator wires 20 in the second gap 1012.

[0037] Optionally, both the first locking hole 103 and the second locking hole 104 are threaded holes, threads are provided on both the first locking member 14 and the second locking member 15, the first locking member 14 is connected to the first locking hole 103 by threaded fit, and the second locking member 15 is connected to the second locking hole 104 by threaded fit; rotating the first locking member 14 and the second locking member 15 can reduce or increase the widths of the first gap 1011 and the second gap 1012.

[0038] Optionally, as Figure 1 and Figure 2 shown in Figure 2 , at least two plugging blocks 13 can be installed in the repair welding hole 102, the two plugging blocks 13 are arranged at intervals, and the two plugging blocks 13 divide the repair welding hole 102 into three sub-repair welding holes; a third gap 1013 for clamping the stator wire 20 is formed between two adjacent plugging blocks 13, and the first gap 1011, the second gap 1012 and the third gap 1013 are respectively correspondingly arranged with the three sub-repair welding holes; adjusting the first locking member 14 and / or the second locking member 15 can lock the stator wire 20 in the first gap 1011, the second gap 1012 and the third gap 1013. In this embodiment, the plugging block 13 is movably installed in the repair welding hole 102; when adjusting the first locking member 14 and / or the second locking member 15 to squeeze the stator wire 20, the two plugging blocks 13 undergo a small displacement along with the stator wire 20, thereby reducing the width of the third gap 1013 until the stator wire 20 in the third gap 1013 is clamped and fixed and stops.

[0039] Optionally, a plurality of repair welding holes 102, a plurality of first locking holes 103, and a plurality of second locking holes 104 are provided on the positioning cover 12. Each repair welding hole 102 is arranged in one-to-one correspondence with each first locking hole 103, and each repair welding hole 102 is arranged in one-to-one correspondence with each second locking hole 104, that is, one repair welding hole 102 corresponds to one first locking hole 103 and one second locking hole 104.

[0040] Optionally, the stator wire locking structure includes a plurality of plugging blocks 13, a plurality of first locking members 14, and a plurality of second locking members 15; after the stator wires 20 are laser standard welded, the positioning cover 12 is covered on the stator wires 20. For example, a plurality of stator wires 20 that need to be repaired are identified. Two plugging blocks 13 are installed in each repair welding hole 102 that needs to be repaired, and then the first locking members 14 and the second locking members 15 are installed in a plurality of first locking holes 103 and second locking holes 104 corresponding to the repair welding holes 102. Therefore, only one operation is required to clamp and lock a plurality of stator wires 20 that need to be repaired.

[0041] Optionally, as Figure 1 and Figure 2 shown, the positioning cover 12 is in a circular ring shape; the positioning cover 12 includes an outer ring plate 121, an inner ring plate 122, and a circular ring top plate 123. The outer ring plate 121 and the inner ring plate 122 are arranged opposite to each other, and the circular ring top plate 123 is fixed between the outer ring plate 121 and the inner ring plate 122. An accommodation groove 101 is formed among the outer ring plate 121, the circular ring top plate 123, and the inner ring plate 122. Each repair welding hole 102 penetrates through the circular ring top plate 123, each first locking hole 103 penetrates through the outer ring plate 121, and each second locking hole 104 penetrates through the inner ring plate 122. In this embodiment, the inner diameter of the outer ring plate 121 is larger than the outer diameter of the inner ring plate 122. The inner ring plate 122 is arranged inside the outer ring plate 121 and is arranged parallel to the outer ring plate 121; the circular ring top plate 123 is perpendicularly connected to the outer ring plate 121 and the inner ring plate 122 respectively.

[0042] Optionally, as Figure 5 shown, a plurality of repair welding holes 102 are arranged at intervals around the central axis of the positioning cover 12, and the length direction of each repair welding hole 102 is arranged along the radial direction of the positioning cover 12.

[0043] Optionally, a plurality of first locking holes 103 are arranged at intervals around the central axis of the positioning cover 12 on the outer ring plate 121; a plurality of second locking holes 104 are arranged at intervals around the central axis of the positioning cover 12 on the inner ring plate 122.

[0044] Optionally, as Figure 2 and Figure 4 shown, the stator wire locking structure further includes a positioning seat 16. The positioning cover 12 is connected to the positioning seat 16, and the positioning seat 16 is used to be sleeved on the stator 30.

[0045] Optionally, as Figure 4 shown, the positioning seat 16 includes a bearing portion 161 and a blocking portion 162. The bearing portion 161 includes an upper surface connecting to the positioning cover 12 and a lower surface connecting to the blocking portion 162. When the positioning seat 16 is sleeved on the stator 30, the lower surface of the bearing portion 161 contacts the end face of the stator 30, and the blocking portion 162 contacts or is adjacent to the side surface of the stator 30. In this embodiment, the outer ring plate 121 of the positioning cover 12 is connected to the upper surface of the bearing portion 161, for example, detachably connected by matching a screw with a screw hole.

[0046] Optionally, both the bearing portion 161 and the blocking portion 162 are annular.

[0047] Optionally, Figure 7 is a schematic three-dimensional structure diagram of the plugging block of the present application, Figure 8 is a schematic front view structure diagram of the plugging block of the present application, as Figure 6 , Figure 7 and Figure 8 shown, each repair welding hole 102 includes a first hole wall 1021 and a second hole wall 1022 which are oppositely arranged. The first hole wall 1021 is provided with at least one first clamping groove 105, and the second hole wall 1022 is provided with at least one second clamping groove 106. The plugging block 13 is provided with a first clamping block 131 and a second clamping block 132. When the plugging block 13 is installed in the repair welding hole 102, the first clamping block 131 is arranged in the first clamping groove 105, and the second clamping block 132 is arranged in the second clamping groove 106. In this embodiment, two mutually spaced first clamping grooves 105 are provided on the first hole wall 1021 of each repair welding hole 102, and two mutually spaced second clamping grooves 106 are provided on the second hole wall 1022. The two first clamping grooves 105 and the two second clamping grooves 106 are used to clamp the first clamping block 131 and the second clamping block 132 of the two plugging blocks 13.

[0048] Optionally, the first clamping block 131 has a certain floating amount in the first clamping groove 105 and the second clamping block 132 has a certain floating amount in the second clamping groove 106, which can not only adapt to the design error of the positioning cover 12, but also facilitate the first locking member 14 and the second locking member 15 to squeeze the plugging block 13, thereby clamping and fixing the stator wire 20 in the third gap 1013.

[0049] Optionally, as Figure 7 and Figure 8 shown, the plugging block 13 includes a locking section 133 and a guiding section 134. The two sides of the head of the locking section 133 are respectively connected to the first clamping block 131 and the second clamping block 132. The tail of the locking section 133 is connected to the guiding section 134. The width and / or thickness of the guiding section 134 gradually decreases in a direction away from the locking section 133. This design facilitates the plugging block 13 to play a guiding role when threading the wire.

[0050] Second Embodiment

[0051] Figure 9 is a schematic structural diagram of the first locking member or the second locking member of the second embodiment of the present application. As Figure 9 shown, the stator wire locking structure of this embodiment is substantially the same as that of the first embodiment. The difference is that an elastic member 17 is fixed to the end of the first locking member 14 and / or the second locking member 15. When the stator wire 20 that needs to be repaired by soldering is identified, the first locking member 14 is installed in the corresponding first locking hole 103, and the first locking member 14 is adjusted so that the elastic member 17 at its end abuts against the stator wire 20. The first locking member 14 is further adjusted to gradually compress the elastic member 17 until the stator wire 20 is locked and then stopped. In this embodiment, the elastic member 17 is provided at the end of the first locking member 14 and / or the second locking member 15, which can protect the stator wire 20 when locking the stator wire 20 and avoid rigid contact between the first locking member 14, the second locking member 15 and the stator wire 20.

[0052] The above embodiments are only illustrative of the principles and effects of the present application and are not intended to limit the present application. Moreover, the structures or structural features involved can be arbitrarily combined and superimposed. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present application should still be covered by the claims of the present application.

Claims

1. A stator wire locking structure, characterized in that, It includes a positioning cover, at least one plugging block and at least one first locking member. The positioning cover is provided with a receiving groove for receiving a stator wire, at least one repair welding hole and at least one first locking hole communicating with the receiving groove. The repair welding hole and the first locking hole are arranged corresponding to each other. The plugging block is detachably installed in the repair welding hole and divides the repair welding hole into a plurality of sub-repair welding holes. The first locking member is detachably connected to the first locking hole. A first gap for clamping the stator wire is formed between the end of the first locking member and the side wall of the plugging block. Adjusting the first locking member can change the width of the first gap. The first gap is arranged corresponding to the sub-repair welding holes.

2. The stator wire locking structure according to claim 1, wherein The positioning cover is further provided with at least one second locking hole communicating with the receiving groove. The second locking hole and the repair welding hole are arranged corresponding to each other. The stator wire locking structure further includes at least one second locking member. The second locking member is detachably connected to the second locking hole. A second gap for clamping the stator wire is formed between the end of the second locking member and the side wall of the plugging block. Adjusting the second locking member can change the width of the second gap. The second gap is arranged corresponding to the sub-repair welding holes.

3. The stator wire locking structure according to claim 2, wherein, Both the first locking hole and the second locking hole are threaded holes. Threads are provided on both the first locking member and the second locking member. The first locking member is connected to the first locking hole through thread fit. The second locking member is connected to the second locking hole through thread fit.

4. The stator wire locking structure according to claim 2, wherein At least two of the plugging blocks can be installed in the repair welding hole. A third gap for clamping the stator wire is formed between two adjacent plugging blocks. The first gap, the second gap and the third gap are respectively arranged corresponding to three of the sub-repair welding holes.

5. The stator wire locking structure according to any one of claims 2 to 4, characterized in that, The positioning cover is in a circular ring shape. The positioning cover includes an outer ring plate, an inner ring plate and a circular ring top plate. The outer ring plate and the inner ring plate are arranged opposite to each other. The circular ring top plate is fixed between the outer ring plate and the inner ring plate. The receiving groove is formed among the outer ring plate, the circular ring top plate and the inner ring plate. The repair welding hole penetrates through the circular ring top plate. The first locking hole penetrates through the outer ring plate. The second locking hole penetrates through the inner ring plate.

6. The stator wire locking structure according to claim 5, wherein, It includes at least one of the following: A plurality of the repair welding holes are provided on the positioning cover. The plurality of repair welding holes are arranged at intervals around the central axis of the positioning cover, and the length direction of each repair welding hole is arranged along the radial direction of the positioning cover. A plurality of the first locking holes are provided on the positioning cover. Each repair welding hole and each first locking hole are arranged in one-to-one correspondence. A plurality of the second locking holes are provided on the positioning cover. Each repair welding hole and each second locking hole are arranged in one-to-one correspondence. The stator wire locking structure includes a plurality of the plugging blocks, a plurality of the first locking members and a plurality of the second locking members.

7. The stator wire locking structure according to any one of claims 1 to 4, characterized in that The stator wire locking structure further includes a positioning seat. The positioning cover is connected to the positioning seat. The positioning seat is used for sleeving on a stator.

8. The stator wire locking structure according to claim 7, characterized in that The positioning base includes a bearing portion and a blocking portion. The bearing portion includes an upper surface connecting the positioning cover and a lower surface connecting the blocking portion. When the positioning base is sleeved on the stator, the lower surface of the bearing portion contacts the end face of the stator, and the blocking portion contacts or is adjacent to the side face of the stator.

9. The stator wire locking structure according to any one of claims 1 to 4, characterized in that, The repair welding hole includes a first hole wall and a second hole wall which are oppositely arranged. At least one first clamping groove is provided on the first hole wall, and at least one second clamping groove is provided on the second hole wall. The plugging block is provided with a first clamping block and a second clamping block. When the plugging block is installed in the repair welding hole, the first clamping block is arranged in the first clamping groove, and the second clamping block is arranged in the second clamping groove.

10. The stator wire locking structure according to claim 9, wherein, The plugging block includes a locking section and a guiding section. The two sides of the head of the locking section are respectively connected to the first clamping block and the second clamping block. The tail of the locking section is connected to the guiding section. The width and / or thickness of the guiding section gradually decreases in a direction away from the locking section.

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