JP6436825B2 - Stator and stator manufacturing method - Google Patents

Description

  The present invention relates to a stator for a rotating electrical machine and a method for manufacturing the stator.

  Conventionally, in a stator of a rotating electrical machine, there is a case where insulation between windings is made more reliable to cope with an increase in power supply voltage. In Patent Document 1, a plate-like insulator is inserted between the windings of the stator to ensure insulation between the windings.

JP 2008-43020 A

  However, in the above conventional technique, a step of inserting a plate-like insulator between the windings occurs after the winding step, which may increase the manufacturing cost. Further, in order to ensure the insulation performance, it is necessary to prevent the displacement of the plate-like insulator. Therefore, extra costs for fixing the plate-like insulator are generated, which may increase the manufacturing cost.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a stator capable of reducing the manufacturing cost and ensuring the insulation performance between the windings.

  In order to solve the above-described problems and achieve the object, the present invention is a stator of a rotating electric machine, which is formed by a core back having a cylindrical shape and a core back separately from the inner periphery of the core back. A plurality of teeth provided at regular intervals in the circumferential direction with respect to the surface, a winding wound around the teeth, an insulating member interposed between the teeth and the winding, and adjacent among the plurality of teeth A connecting member that connects the insulating members provided between the teeth, and an insulating separator that is formed integrally with the connecting member and that is provided between the teeth that are connected to the connecting member. .

  According to the stator according to the present invention, it is possible to reduce the manufacturing cost and secure the insulation performance between the windings.

The figure which shows the stator of the rotary electric machine concerning Embodiment 1 of this invention. The figure which shows the arrangement | positioning state of the component of the stator core before punching out from the electromagnetic steel plate in Embodiment 1 The figure which is the component after punching out from the electromagnetic steel plate in Embodiment 1, Comprising: The figure which shows the component which comprises a tooth | gear The figure which is the component after punching out from the electromagnetic steel plate in Embodiment 1, Comprising: The figure which shows the component which comprises a core back | bag The figure which shows the 1st cyclic | annular insulation tooth pair in Embodiment 1. The figure which shows the 2nd cyclic | annular insulation tooth pair in Embodiment 1. The figure which shows the 3rd cyclic | annular insulation tooth pair in Embodiment 1. The figure which shows the state which wound the coil | winding to the 1st cyclic | annular insulation tooth pair in Embodiment 1. FIG. The figure which shows the state which wound the coil | winding to the 2nd cyclic | annular insulation tooth pair in Embodiment 1. FIG. The figure which shows the state which wound the coil | winding to the 3rd cyclic | annular insulation tooth pair in Embodiment 1. FIG. In Embodiment 1, it is arrow sectional drawing along the AA shown in FIG. The figure which shows the cyclic | annular insulation teeth part in Embodiment 1. FIG. The figure which shows the stator of the rotary electric machine concerning Embodiment 2 of this invention. The figure which shows the arrangement | positioning state of the component of the stator core before punching out from the electromagnetic steel plate in Embodiment 2. The figure which shows the 1st cyclic | annular insulation tooth pair in Embodiment 2. The figure which shows the 2nd cyclic | annular insulation tooth pair in Embodiment 2. The figure which shows the 3rd cyclic | annular insulation tooth pair in Embodiment 2. The figure which shows the state which wound the coil | winding to the 1st cyclic | annular insulation tooth pair in Embodiment 2. FIG. The figure which shows the state which wound the coil | winding to the 2nd cyclic | annular insulation tooth pair in Embodiment 2. FIG. The figure which shows the state which wound the coil | winding to the 3rd cyclic | annular insulation tooth pair in Embodiment 2. FIG. FIG. 18 is a cross-sectional view taken along line BB shown in FIG. 18 in the second embodiment.

  Hereinafter, a stator according to an embodiment of the present invention and a method for manufacturing the stator will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a stator of a rotating electrical machine according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating an arrangement state of components of the stator core before being punched from the electromagnetic steel sheet. FIG. 3 is a diagram showing components that are punched from the electromagnetic steel sheet and that constitute the teeth. FIG. 4 is a diagram showing components after punching out from the electromagnetic steel sheet and constituting the core back. FIG. 5 is a view showing a first annular insulating tooth pair. FIG. 6 is a diagram showing a second annular insulating tooth pair. FIG. 7 is a view showing a third annular insulating tooth pair. FIG. 8 is a diagram illustrating a state where a winding is wound around the first pair of annular insulating teeth. FIG. 9 is a diagram illustrating a state in which a winding is wound around the second annular insulating tooth pair. FIG. 10 is a diagram illustrating a state where a winding is wound around the third pair of annular insulating teeth. 11 is a cross-sectional view taken along line AA shown in FIG. FIG. 12 is a diagram illustrating an annular insulating tooth portion. For easy understanding of the drawings, the core back 1 and the teeth 2 are hatched.

  A stator 100 shown in FIG. 1 includes a core back 1 that has an annular shape (cylindrical shape), and an annular insulating tooth portion 3 that is fitted inside the core back 1. The annular insulating tooth portion 3 is formed separately from the core back 1, and is provided with a plurality of teeth 2 (2a, 2b, 2c) provided at a constant interval along the circumferential direction with respect to the inner peripheral surface of the core back 1. , 2d, 2e, 2f), the insulating winding frames 4a, 4b, 4c, 4d, 4e, 4f, which are a plurality of insulating members respectively applied to the teeth 2, and the teeth via the plurality of insulating winding frames 4a to 4f. Windings 5a to 5f wound around 2, an annular connecting member 6ad for connecting the insulating winding frame 4a and the insulating winding frame 4d, an annular connecting member 6be for connecting the insulating winding frame 4b and the insulating winding frame 4e, and insulation An annular connecting member 6cf for connecting the winding frame 4c and the insulating winding frame 4f, separators 7bc and 7ef provided integrally with the connecting member 6ad, separators 7cd and 7fa provided integrally with the connecting member 6be, and a connecting member 6cf. Together Digit and a separator 7ab and 7De.

  As shown in FIGS. 2 and 4, the core back 1 is formed by laminating core back constituent members 10 obtained by punching electromagnetic steel sheets 50 into an annular shape. As shown in FIGS. 2 and 3, the teeth 2 are obtained by laminating the constituent members 20 of the teeth obtained by punching the electromagnetic steel plates 50 into a T shape. The insulating winding frames 4a to 4f cover portions of the teeth 2 around which the windings 5a to 5f are wound, and are interposed between the teeth 2 and the windings 5a to 5f. Note that the stacking direction is a direction perpendicular to the paper surface in FIGS. 1, 5 to 10, and 12. The core back 1 and the teeth 2 constitute a stator core.

  The manufacturing procedure of the stator 100 will be described below. The core back constituent member 10 and the tooth constituent member 20 are punched out in the form shown in FIG. 2 by a press apparatus (not shown), and each of them is required to be connected to the paper surface in the vertical direction by caulking or bonding. The teeth 2 and the core back 1 are formed by stacking the number of sheets. Thus, in this Embodiment 1, the core back 1 and the teeth 2 which comprise a fixed iron core are formed separately.

  Next, as shown in FIG. 5, the insulating winding frames 4 a and 4 d are formed by covering portions of the teeth 2 (2 a and 2 d) around which the windings are wound with resin as an insulating member. The insulating reels 4a and 4d also function as a guide when winding the winding. Further, the insulating winding frame 4a and the insulating winding frame 4d are connected by a connecting member 6ad made of resin, and the separators 7bc and 7ef made of resin are erected on the connecting member 6ad so that the first annular insulating teeth pair as a connecting body is provided. 30 is formed.

  Similarly, as shown in FIG. 6, the insulating winding frames 4b and 4e are formed by covering portions of the teeth 2 (2b and 2e) around which the windings are wound with resin as an insulating member. The insulating reels 4b and 4e also function as a guide when winding the winding. Further, the insulating winding frame 4b and the insulating winding frame 4e are connected by a resin-made connecting member 6be, and resin-made separators 7cd and 7fa are erected on the connecting member 6be, so that a second annular insulating tooth pair as a connecting body is provided. 31 is formed.

  Similarly, as shown in FIG. 7, portions of the teeth 2 (2c, 2f) around which the windings are wound are covered with a resin as an insulating member to form insulating winding frames 4c, 4f. The insulating winding frames 4c and 4f also function as a guide when winding the winding. Further, the insulating winding frame 4c and the insulating winding frame 4f are connected by a connecting member 6cf made of resin, and the separators 7ab and 7de made of resin are erected on the connecting member 6cf, so that a third annular insulating tooth pair as a connecting body is provided. 32 is formed.

  Of the first to third annular insulating tooth pairs 30 to 32, the resin portion excluding the tooth 2 may be integrally molded, or a separately molded one may be integrated by assembly. Alternatively, the teeth 2 may be inserted and integrally molded with resin to form the first to third annular insulating teeth pairs 30 to 32.

  Next, as shown in FIGS. 8 and 11, the windings 5 a and 5 d are wound around the teeth 2 (2 a and 2 d) of the first annular insulating tooth pair 30. Further, as shown in FIG. 9, the windings 5 b and 5 e are wound around the teeth 2 (2 b and 2 e) of the second annular insulating tooth pair 31. Further, as shown in FIG. 10, the windings 5 c and 5 f are wound around the teeth 2 (2 c and 2 f) of the third annular insulating tooth pair 32. For example, when the pair of teeth 2a and 2d constitutes the U phase, the pair of teeth 2b and 2e constitutes the V phase, and the pair of teeth 2c and 2f constitutes the W phase, the two applied to each pair Connection work can be omitted by connecting the windings with a crossover. On the other hand, if the number of teeth of the stator is 12, the rotor is 10 poles, and it is three-phase, it is divided into three pairs of annular insulating teeth in which four teeth are arranged in a cross, and each tooth is divided. Winding will be wound. In this case, since two different windings are applied to the same pair of annular insulating teeth, the windings cannot be connected by a jumper. In this case, loosening of the winding can be suppressed by winding the winding start portion and the winding end portion of the winding on the unillustrated pinned pin provided on the insulating winding frame.

  Next, as shown in FIG. 12, the first to third annular insulating tooth pairs 30 to 32 are combined to form an annular insulating tooth portion (annular tooth portion) 3 in which the teeth 2a to 2f are arranged in an annular shape. . The separators 7ab, 7bc, 7cd, 7de, 7ef, 7fa are inserted between the teeth 2 when the first to third annular insulating tooth pairs 30 to 32 are combined to form the annular insulating tooth portion 3. Is formed. More specifically, the separators 7bc and 7ef formed on the first annular insulating tooth pair 30 are inserted between teeth different from the teeth 2a and 2d included in the first annular insulating tooth pair 30. Formed. Further, the separators 7cd and 7fa formed on the second annular insulating tooth pair 31 are formed at positions inserted between teeth different from the teeth 2b and 2e included in the second annular insulating tooth pair 31. . In addition, the separators 7ab and 7de formed on the third annular insulating tooth pair 32 are formed at positions inserted between the teeth 2c and 2f included in the third annular insulating tooth pair 32. .

  Next, the stator 100 shown in FIG. 1 is formed by press-fitting the annular insulating teeth portion 3 inside the core back 1 or by shrink fitting with the core back 1 at a high temperature and the teeth 2 at a low temperature. .

  According to the stator 100 described above, in the first to third annular insulating tooth pairs 30 to 32, the teeth 2 that are not adjacent to each other are connected in the combined state as the annular insulating tooth portion 3. Therefore, it is easy to secure a space between the teeth. The plurality of teeth 2 are separated from the core back 1. Therefore, the core back 1 does not get in the way when winding the winding. In addition, the separators 7ab, 7bc, 7cd, 7de, 7ef, 7fa are inserted in positions between the teeth that are different from the teeth that the annular insulating teeth pair is connected to in each of the annular insulating teeth pairs 30 to 32. Since it is formed, it is easy to secure a space between the insulating winding frames 4a to 4f and the separators 7ab, 7bc, 7cd, 7de, 7ef, and 7fa. Therefore, it becomes easy to secure a work space for winding the winding around the insulating winding frames 4a to 4f. For example, it becomes difficult to obstruct the path of the magnet wire, and the winding can be wound in an orderly and high density in a short time.

  Further, since the separators 7ab, 7bc, 7cd, 7de, 7ef, 7fa are formed in advance in the state of the first to third annular insulating teeth pairs 30 to 32, the separators are inserted and fixed after the winding is wound. Therefore, the manufacturing cost can be reduced while ensuring the insulation performance between the windings.

Embodiment 2. FIG.
FIG. 13 is a diagram illustrating the stator of the rotating electrical machine according to the second embodiment of the present invention. FIG. 14 is a diagram showing an arrangement state of the components of the stator core before being punched from the electromagnetic steel sheet in the second embodiment. FIG. 15 is a diagram illustrating a first annular insulating tooth pair according to the second embodiment. FIG. 16 is a diagram showing a second annular insulating tooth pair in the second embodiment. FIG. 17 is a diagram showing a third annular insulating tooth pair in the second embodiment. FIG. 18 is a diagram illustrating a state where a winding is wound around the first annular insulating tooth pair according to the second embodiment. FIG. 19 is a diagram illustrating a state where a winding is wound around the second annular insulating tooth pair according to the second embodiment. FIG. 20 is a diagram illustrating a state where a winding is wound around the third annular insulating tooth pair according to the second embodiment. 21 is a cross-sectional view taken along the line BB shown in FIG. 18 in the second embodiment. In addition, about the structure similar to the said Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  A stator 110 shown in FIG. 13 includes a core back 51 having an annular shape (cylindrical shape) and a plurality of teeth 52 (52a) provided at regular intervals along the circumferential direction with respect to the inner peripheral surface of the core back 51. , 52b, 52c, 52d, 52e, 52f). The teeth 52 are formed so as to protrude along the cylindrical radial direction exhibited by the core back 51.

  The core back 51 is formed in a cylindrical shape by connecting unit members 51a, 51b, 51c, 51d, 51e, 51f divided by the number of teeth 52 along the circumferential direction. In the second embodiment, since six teeth are formed, the unit members 51a, 51b, 51c, 51d, 51e, and 51f are formed by dividing the core back 51 into six along the circumferential direction. .

  Similarly to the first embodiment, the stator 110 is a plurality of insulating winding frames 4a and 4b that are a plurality of insulating members respectively applied to the plurality of teeth 52 (52a, 52b, 52c, 52d, 52e, and 52f). , 4c, 4d, 4e, 4f, windings 5a-5f wound around the teeth 2 via a plurality of insulating winding frames 4a-4f, and an annular connecting member 6ad that connects the insulating winding frame 4a and the insulating winding frame 4d. An annular connecting member 6be for connecting the insulating winding frame 4b and the insulating winding frame 4e, an annular connecting member 6cf for connecting the insulating winding frame 4c and the insulating winding frame 4f, and a separator 7bc provided integrally with the connecting member 6ad. And 7ef, separators 7cd and 7fa provided integrally with the connecting member 6be, and separators 7ab and 7de provided integrally with the connecting member 6cf.

  The unit members 51a, 51b, 51c, 51d, 51e, and 51f are obtained by laminating the structural members 80 of unit members and teeth obtained by punching the electromagnetic steel sheet 70 into an annular shape as shown in FIG. .

  The manufacturing procedure of the stator 110 will be described below. In a press apparatus (not shown), the constituent members 80 of unit members and teeth are punched out in the form shown in FIG. 14, and the necessary number of sheets are stacked while being connected by caulking or bonding in a direction perpendicular to the paper surface. Thus, a member in which the unit members 51a, 51b, 51c, 51d, 51e, 51f and the teeth 52 are integrated is formed.

  Next, as shown in FIG. 15, portions of the teeth 52 (52 a and 52 d) around which the windings are wound are covered with a resin that is an insulating member to form insulating winding frames 4 a and 4 d. The insulating reels 4a and 4d also function as a guide when winding the winding. Further, the insulating winding frame 4a and the insulating winding frame 4d are connected by a connecting member 6ad made of resin, and the separators 7bc and 7ef made of resin are erected on the connecting member 6ad so that the first annular insulating teeth pair as a connecting body is provided. 90 is formed. Unlike the first embodiment, the first annular insulating tooth pair 90 is provided with unit members 51a, 51b, 51c, 51d, 51e, 51f obtained by dividing the core back 51.

  Similarly, as shown in FIG. 16, portions of the teeth 52 (52 b and 52 e) around which the windings are wound are covered with a resin which is an insulating member to form insulating winding frames 4 b and 4 e. The insulating reels 4b and 4e also function as a guide when winding the winding. Further, the insulating winding frame 4b and the insulating winding frame 4e are connected by a resin-made connecting member 6be, and resin-made separators 7cd and 7fa are erected on the connecting member 6be, so that a second annular insulating tooth pair as a connecting body is provided. 91 is formed.

  Similarly, as shown in FIG. 17, the insulating winding frames 4c and 4f are formed by covering portions of the teeth 52 (52c and 52f) around which the windings are wound with a resin which is an insulating member. The insulating winding frames 4c and 4f also function as a guide when winding the winding. Further, the insulating winding frame 4c and the insulating winding frame 4f are connected by a connecting member 6cf made of resin, and the separators 7ab and 7de made of resin are erected on the connecting member 6cf, so that a third annular insulating tooth pair as a connecting body is provided. 92 is formed.

  Of the first to third annular insulating tooth pairs 90 to 92, the resin portions excluding the unit members 51a, 51b, 51c, 51d, 51e, 51f and the teeth 52 may be formed integrally or separately. What is molded by the body may be integrated by assembly. Alternatively, the teeth 52 may be inserted and integrally molded with resin to form the first to third annular insulating teeth pairs 90 to 92.

  Next, as shown in FIGS. 18 and 21, the windings 5 a and 5 d are wound around the teeth 52 (52 a and 52 d) of the first annular insulating tooth pair 90. Further, as shown in FIG. 19, the windings 5 b and 5 e are wound around the teeth 52 (52 b and 52 e) of the second annular insulating tooth pair 91. As shown in FIG. 20, the windings 5c and 5f are wound around the teeth 52 (52c and 52f) of the third annular insulating tooth pair 92. For example, when the pair of teeth 52a and 52d constitutes the U phase, the pair of teeth 52b and 52e constitutes the V phase, and the pair of teeth 52c and 52f constitutes the W phase, the two applied to each pair Connection work can be omitted by connecting the windings with a crossover. On the other hand, if the number of teeth of the stator is 12, the rotor is 10 poles, and it is three-phase, it is divided into three pairs of annular insulating teeth in which four teeth are arranged in a cross, and each tooth is divided. Winding will be wound. In this case, since two different windings are applied to the same pair of annular insulating teeth, the windings cannot be connected by a jumper. In this case, loosening of the winding can be suppressed by winding the winding start portion and the winding end portion of the winding on the unillustrated pinned pin provided on the insulating winding frame.

  Next, by combining the first to third annular insulating tooth pairs 90 to 92 and connecting the unit members 51a, 51b, 51c, 51d, 51e, and 51f, the cylindrical core back 51 is formed. The stator 110 shown in FIG. 13 is formed. The unit members 51a, 51b, 51c, 51d, 51e, and 51f are connected to each other by fitting the contact surfaces as a fitting shape, or welding the contact surfaces to each other.

  The separators 7ab, 7bc, 7cd, 7de, 7ef, 7fa are formed at positions inserted between the teeth 52 when the stator 110 is formed by combining the first to third annular insulating tooth pairs 90-92. ing. More specifically, the separators 7bc and 7ef formed on the first annular insulating tooth pair 90 are inserted between teeth different from the teeth 52a and 52d included in the first annular insulating tooth pair 90. Formed. Further, the separators 7cd and 7fa formed on the second annular insulating tooth pair 91 are formed at positions inserted between teeth different from the teeth 52b and 52e included in the second annular insulating tooth pair 91. . Further, the separators 7ab and 7de formed on the third annular insulating tooth pair 92 are formed at positions inserted between teeth different from the teeth 52c and 52f included in the third annular insulating tooth pair 92. .

  According to the stator 110 described above, in the first to third annular insulating tooth pairs 90 to 92, the teeth 52 that are not adjacent to each other in the state of the stator 110 are connected to each other. Therefore, it is easy to secure a space between the teeth. In addition, the separators 7ab, 7bc, 7cd, 7de, 7ef, 7fa are inserted between the teeth that are different from the teeth that the annular insulating teeth pair is connected to in each of the annular insulating teeth pairs 90 to 92. Since it is formed, it is easy to secure a space between the insulating winding frames 4a to 4f and the separators 7ab, 7bc, 7cd, 7de, 7ef, and 7fa. Therefore, it becomes easy to secure a work space for winding the winding around the insulating winding frames 4a to 4f. For example, it becomes difficult to obstruct the path of the magnet wire, and the winding can be wound in an orderly and high density in a short time.

  Further, since the separators 7ab, 7bc, 7cd, 7de, 7ef, 7fa are formed in advance in the state of the first to third annular insulating teeth pairs 90 to 92, the separators are inserted and fixed after the windings are wound. Therefore, the manufacturing cost can be reduced while ensuring the insulation performance between the windings.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  1 core back, 2, 2a, 2b, 2c, 2d, 2e, 2f teeth, 3 annular insulating teeth (annular teeth), 4a, 4b, 4c, 4d, 4e, 4f insulating winding frame (insulating member), 5a , 5b, 5c, 5d, 5e, 5f Winding, 6ad, 6be, 6cf Connecting member, 7ab, 7bc, 7cd, 7de, 7ef, 7fa Separator, 10 Core back component, 20 Teeth component, 30 1st Cyclic insulating teeth pair, 31 second annular insulating tooth pair, 32 third annular insulating tooth pair, 50 magnetic steel sheet, 51 core back, 51a, 51b, 51c, 51d, 51e, 51f unit member, 52, 52a, 52b, 52c, 52d, 52e, 52f Teeth, 70 Electrical steel plate, 80 Constituent member of unit member and teeth, 90 First annular Edge tooth pair, 91 second annular insulating teeth pairs, 92 third annular insulating teeth pairs 100, 110 stator.

Claims (5)

A stator of a rotating electric machine,
A core back having a cylindrical shape;
A plurality of teeth formed separately from the core back and provided at regular intervals along the circumferential direction with respect to the inner peripheral surface of the core back;
Windings wound around the teeth;
An insulating member interposed between the teeth and the winding;
A connecting member for connecting insulating members provided between non-adjacent teeth among the plurality of teeth;
A stator comprising: an insulating separator formed integrally with the connecting member and provided between teeth different from the teeth connected by the connecting member. A method of manufacturing a stator of a rotating electric machine,
A step of covering a portion of the plurality of teeth around which the winding is wound with an insulating member;
Winding the winding around the teeth;
A step of connecting the insulating members provided on the plurality of teeth with a connecting member to form a plurality of connected bodies;
Combining a plurality of the coupling bodies to form an annular tooth portion;
It is seen containing a step of fitting the annular tooth portion on the inner side of the core back exhibiting a cylindrical shape, and wherein the coupling member, formed integrally with the insulating separator provided between the teeth different from the tooth to be connected is the coupling member A method for manufacturing a stator, wherein   3. The stator according to claim 2, wherein the step of fitting the annular tooth portion inside the core back is performed by shrink fitting with the core back at a high temperature and the annular tooth portion at a low temperature. Production method. A stator of a rotating electric machine,
A core back having a cylindrical shape;
A plurality of teeth formed integrally with the core back and provided at regular intervals along the circumferential direction with respect to the inner peripheral surface of the core back;
Windings wound around the teeth;
An insulating member interposed between the teeth and the winding;
A connecting member for connecting insulating members provided between non-adjacent teeth among the plurality of teeth;
An insulating separator formed between the teeth different from the teeth that are integrally formed with the connecting member and connected by the connecting member;
The stator is characterized in that the core back has a cylindrical shape by connecting unit members divided by the number of teeth along the circumferential direction. A method of manufacturing a stator of a rotating electric machine,
A step of covering the portion around the teeth formed on the unit member formed by dividing the core back having a cylindrical shape along the circumferential direction with an insulating member;
Winding the winding around the teeth;
A step of connecting the insulating members provided on the plurality of teeth with a connecting member to form a plurality of connected bodies;
By combining a plurality of said connecting member, it viewed including the the steps of connecting the unit member in a cylindrical shape,
The method of manufacturing a stator, wherein an insulating separator provided between the teeth different from the teeth to be connected by the connecting member is formed integrally with the connecting member .

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