JP2009148123A - Rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a configuration where a yoke itself and a permanent magnet on the inner peripheral surface of the yoke are not affected, with fixing being assured, when the yoke of an electric motor in which the permanent magnet is fixed on the inner peripheral surface is fixed by caulking to a bracket. <P>SOLUTION: A caulking tab 2f is formed to protrude from an open end part 2d of a cylindrical yoke 2. At a base end which is the open end 2d side of the caulking tab 2f, a jig receiving piece 2f that protrudes to the outer diameter side is formed for the caulking tab 2f. A tab piece part 2h of the caulking tab 2f is inserted in a caulking hole 3c opened on an end bracket 3. The inserting tip part is fixed by caulking using a caulking tool 11 abutted with the caulking tab 2f and a caulking receiving tool 10 abutted with the jig receiving piece 2f. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention belongs to the technical field of rotating electrical machines that constitute actuators and the like mounted on vehicles.

  Generally, in this type of rotating electrical machine, there is a configuration in which an end bracket (corresponding to the bracket of the present invention) is fixed to the opening end of a cylindrical yoke. In this case, the yoke opening end, the end bracket, As a fixing means (integration means), a configuration is adopted in which a caulking piece is formed on one member, the caulking piece is inserted into a through-hole formed in the other member, and the insertion tip is caulked to fix. Are known.

As a specific example of this, a plurality of crimping claws projecting in the cylinder length direction of the yoke are formed at the opening end of the bottomed cylindrical yoke in the circumferential direction, while penetrating through each end of the crimping claws into the end bracket. It has been proposed that holes are formed, caulking claws are respectively inserted into the through holes, and the insertion tip portions are caulked (openly caulked) and fixed.
JP 2004-56920 A

However, in the above-described conventional one, when the insertion tip portions of these caulking claws are fixed by caulking, one jig (caulking tool) constituting the caulking device is applied to the caulking nail side and receives the caulking force. The jig (caulking support) is applied to the bottom piece of the yoke and the caulking work is performed. For this reason, the caulking force generated between the caulking tool and the caulking support acts over the entire length of the yoke in the cylinder length direction. In particular, in the case where the yoke has a long cylinder length, the yoke In this case, there is a possibility that the crimped state of each crimping claw may vary and the yoke and the end bracket may not be stably fixed.
Furthermore, since the caulking force acts on the entire length of the yoke, it may affect the permanent magnet disposed on the inner peripheral surface of the yoke. When the permanent magnet is bonded and fixed, the caulking force acts directly on the permanent magnet. If the permanent magnet is fixed using a spring-attached attachment member such as a magnet spring, the caulking force acts on the attachment member and the permanent magnet is displaced. However, there are problems that the present invention should solve.

The present invention has been created in view of the above-described circumstances in order to solve these problems. The invention of claim 1 is directed to a cylindrical yoke in which a permanent magnet is fixed to an inner peripheral surface. When the caulking claw is formed to project at the opening end, the caulking claw is inserted into a through-hole formed in the bracket that covers the opening end of the yoke, and the insertion tip is caulked to integrate the yoke and the bracket. In the rotating electric machine, a jig receiving piece protruding to the outer diameter side is formed at the base end of the crimping claw.
The invention according to claim 2 is the rotating electrical machine according to claim 1, wherein the bracket is formed with a plurality of cut and raised pieces for positioning the yoke.

According to the invention of claim 1, the caulking force does not affect the yoke main body, and each caulking fixing state can be made uniform and stable, and the shaft core accuracy is excellent and the reliability is high. Can provide products.
By setting it as invention of Claim 2, the further improvement of an axial center precision can be aimed at.

Next, embodiments of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes an electric motor (rotary electric machine) mounted on a vehicle, and the electric motor 1 includes a yoke 2 and an end bracket that covers the open end 2a of the yoke 2 (corresponding to the bracket of the present invention). 3) and a member such as an armature 5 provided with an armature shaft (motor shaft) 4 rotatably supported by the yoke 2 and the end bracket 3 is a conventional one.

The yoke 2 is formed in a cylindrical shape with a bottom from a metal material, and a bottom piece 2c is formed on the base end side in the cylinder length direction of the cylindrical main body 2b. In the bottom piece 2c, A small-diameter bearing portion 2d is formed so as to project toward the base end side, and the base end portion of the armature shaft 4 is rotatably supported by the bearing portion 2d via a bearing 4a. A pair of permanent magnets 6 in the circumferential direction are fixed to the inner peripheral surface of the main body 2b of the yoke 2 by an adhesive means.
On the other hand, the yoke opening end portion 2a is bent in a curved shape toward the outer diameter side, and a surface following the inner peripheral surface of the main body portion 2b is a ring-shaped receiver that abuts against the end bracket 3 that abuts from the front end side. It is formed on the surface 2e. Further, caulking claws 2f are formed at a plurality of locations (four locations in the present embodiment) in the circumferential direction of the opening end 2a. Each caulking claw 2f projects further outward from the opening end 2a. A jig receiving piece 2g constituting the base end of the crimping claw 2f, and a claw piece branched and formed in a bifurcated shape protruding in the axial direction of the armature shaft 4 from the protruding end of the jig receiving piece 2g 2h.

On the other hand, the end bracket 3 includes a flat plate-like main body portion 3a and a bearing portion 3b that is positioned substantially at the center of the main body portion 3a and protrudes from the main body portion 3a to the front end side. The end portion of the armature shaft 4 is rotatably supported through a bearing 4b housed in the portion 3b. The main body 3a is set so as to abut against the ring-shaped receiving surface 2e of the yoke 2 and the jig receiving piece 2g of the caulking claw 2f so as to close the opening of the yoke 2. As will be described later, a penetrating caulking hole (corresponding to the through hole of the present invention) 3c through which the claw piece 2h of the caulking claw 2f formed in the yoke 2 is inserted and fixed is inserted into the portion. It is formed at four locations in the direction.
Further, on the outer peripheral portion of the end bracket 3, there is formed a cut-and-raised piece 3d which is located at a portion adjacent to each caulking hole 3c in the circumferential direction and whose inner diameter side end portion is cut and raised toward the base end side. The end portions on the inner diameter side of the cut-and-raised pieces 3d are in contact with the yoke opening end portion 2a from the outer diameter direction when the end bracket 3 is assembled into the yoke 2, and are located between the end bracket 3 and the yoke 2. It is configured to perform positioning.
Further, the end bracket 3 is provided with terminal insertion holes 3e through which a terminal support portion 7a formed integrally with a brush holder stay 7 described later is penetrated and positioned at two places in the circumferential direction.

  Further, the armature 5 is configured such that a plurality of core members 5a are externally fitted to the armature shaft 4 in a non-rotating manner, and windings 5b are wound around the outer periphery of the core members 5a to form a plurality of coils. The windings 5b of these coils are electrically connected to appropriate portions of a plurality of segments 8a in the circumferential direction provided on the outer peripheral surface of the commutator 8 that is fitted around the tip end side of the armature shaft 4 in a non-rotating manner. It is connected. The armature 5 has a proximal end portion of the armature shaft 4 supported by the yoke bearing portion 2d, a distal end portion thereof supported in a penetrating manner by the end bracket bearing portion 3b, and a projecting distal end projecting from the end bracket body portion 3a to the distal end side. The actuator 4c is set so as to be fitted around the portion (penetrating tip) so as to prevent rotation.

  The brush holder stay 7 includes a ring-shaped stay main body portion 7c having a through hole 7b penetrating the armature shaft 4, and protrudes from the stay main body portion 7c to both sides in the axial direction of the armature shaft 4. In this state, the terminal support portion 7a is formed. Further, brush holders 7d are formed at two places in the circumferential direction on the base end side surface of the stay main body 7c, and the brushes 9 are accommodated in the brush holders 7d, respectively. Are freely slidable and are urged toward the commutator 8 by an urging urging machine (not shown) supported by the stay main body 7d. A terminal plate 9a that is electrically connected to the brush 9 is held by the terminal support portion 7a and is provided so as to protrude from the stay main body portion 7c to the distal end side (outside).

  Then, by supporting the terminal support portion 7a through the terminal insertion hole 3e of the end bracket 3, the brush holder stay 7 is incorporated into the end bracket 3, and the end bracket 3 into which the brush holder stay 7 is incorporated is replaced by the armature 5. The electric motor 1 is configured by being incorporated in the incorporated yoke 2. In this case, the yoke 2 and the end bracket 3 are positioned in the circumferential direction by inserting the crimping claws 2f of the yoke 2 corresponding to the respective crimping holes 3c of the end bracket 3, and further in this state, the end bracket 3 is configured such that the yoke 2 and the end bracket 3 are positioned in the radial direction by abutting the cut-and-raised piece 3d against the yoke opening end 2a.

In this assembled state, as shown in FIGS. 5 and 6, the yoke 2 and the end bracket 3 are integrated with each other by crimping each crimping claw 2 f using a crimping device. .
At this time, a jig receiving piece 2g is formed at the base end of each crimping claw 2f so as to protrude further from the opening end 2a to the outer diameter side. It is in the state which contact | abutted to the base end side surface of the bracket main-body part 3a. In this state, the jig receiving piece 2g constitutes a caulking device, and a receiving side jig (hereinafter referred to as a caulking receiving tool) 10 that receives the caulking force is abutted from the base end side. The caulking support 10 is configured to receive a load acting on the piece 2g. In the caulking support 10, a caulking force receiving surface portion 10 a against which the jig receiving piece portion 2 g abuts is formed in a concave groove shape on the cylinder front end surface that is abutted against the base side surface of the bracket 3, and the caulking force receiving surface portion 10 a By being incorporated in the yoke 2 in a state where the jig receiving piece 2g is fitted, the crimping receiving tool 10 is configured to be in a stable state.
On the other hand, the tip end caulking tool 11 constituting the caulking device is abutted against the crotch portion of the claw piece portion 2h which is the tip end side of the crimping claw 2f and which is the tip portion of the end bracket 3 through which the crimping hole 3c is inserted. Is set to

Then, as shown in FIG. 6 (A), by pressing the crimping tool 11 toward the crimping receiver 10, the crotch portion of the claw piece 2h is deformed into an expanded shape (open crimped), thereby The deformed crimping claw 2e is in a caulking fixed state that interferes (locks) with the hole edge of the crimping hole 3c, and the yoke 2 and the end bracket 3 are integrated as shown in FIG. 6B. Is set. In this case, the crimping force generated by pressurizing the crimping tool 11 is configured to be received by the crimping tool 10 via the jig receiving piece 2g. As a result, the caulking force does not affect the yoke body 2b side, and the caulking force reaches the entire length in the cylinder length direction of the yoke 2 as in the conventional case where the caulking force is received on the bottom piece side. In addition, there is no problem that causes distortion, and it is possible to reliably prevent a problem that occurs due to the caulking force acting on the permanent magnet 6 fixed to the yoke body 2b. Further, when the crimping tool 11 is pressurized, only the end bracket 3 and the jig receiving piece 2g are interposed between the crimping tool 11 and the crimping receiver 10, and the crimping tool 11 and the crimping tool 11 are inserted. The space between the support 10 and the support 10 is narrowed so that the crimped state of each crimping claw 2f can be made uniform and stable.
Further, when the crimping tool 11 is caulked and fixed, it is assumed that the end bracket 3 is displaced with respect to the yoke 2, but the tip of the cut and raised piece 3d formed on the end bracket 3 projects into the yoke opening end 2a. By being applied, the radial positional deviation is prevented, and it is possible to prevent such a problem that the accuracy of the axial alignment between the yoke 2 and the end bracket 3 is lowered.

In this embodiment configured as described, the crimping claw 2f extending to the opening end 2a of the yoke 2 is inserted into the crimping hole 3c formed in the end bracket 3 and fixed to the yoke 2 by fixing. The end bracket 3 is fixed. In this case, the caulking claw 2f has a jig receiving piece 2g formed at the base end, and the caulking force (caulking force) for caulking the claw piece 2h of the caulking claw 2f. The crimping force based on pressurization of the tool 11 can be received by the crimping receiver 10 applied to the jig receiving piece 2g. As a result, the caulking force does not reach the entire length in the tube length direction of the yoke 2 and the entire caulking force is not distorted as in the conventional case where the caulking force is received on the bottom piece side. It is possible to prevent the permanent magnet 6 from being damaged by acting on the permanent magnet 6 fixed to the side of the portion 2b or causing a malfunction in the fixed state.
In addition, since the crimping tool 11 can be pressurized with a narrow gap formed between the crimping tool 10 and the crimping claw 2f, the crimping fixed state of each crimping claw 2f can be made uniform and stable. The axial accuracy of the yoke 2 and the end bracket 3 with respect to the armature shaft 4 is improved, and the reliability of the product can be improved.

  Furthermore, in the embodiment in which the present invention is implemented, the leading end portion of the cut and raised piece 3d formed on the end bracket 3 is abutted against the yoke opening end portion 2a, and the end bracket 3 and the yoke 2 are in the radial direction. Therefore, it is possible to further improve the accuracy of axis alignment between the yoke 2 and the end bracket 3.

1A and 1B are a side sectional view of an electric motor and a front view of the electric motor, respectively. FIGS. 2A and 2B are a rear view of the electric motor and an XX cross-sectional view of FIG. 3A, 3 </ b> B, 3 </ b> C, and 3 </ b> D are a side cross-sectional view, a front view, a rear view, and an enlarged side view of the main part of the yoke, respectively. 4 (A), (B), (C), and (D) are front views of the end bracket, XX sectional view, rear view, and YY sectional view of FIG. 4 (C), respectively. FIG. 5A and 5B are side cross-sectional views for explaining a state in which the yoke is caulked and fixed to the end bracket, respectively, and an enlarged view of a main part of FIG. 5A. 6A and 6B are a side view and a perspective view, respectively, of a main part for explaining the caulking process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Yoke 2f Caulking claw 2g Jig receiving piece part 2h Claw piece part 3 End bracket 3c Caulking hole 3d Cut and raised piece 4 Armature shaft 7 Brush holder stay 10 Caulking receiving tool 11 Caulking tool 11

Claims (2)

  A caulking claw is formed to project at the opening end of a cylindrical yoke to which a permanent magnet is fixed on the inner peripheral surface, and the caulking claw is inserted into a through-hole formed in a bracket that covers the opening end of the yoke. A rotating electrical machine in which a jig receiving piece protruding to the outer diameter side is formed at the base end of the crimping claw when the tip and the yoke and the bracket are integrated.   The rotating electrical machine according to claim 1, wherein the bracket is formed with a plurality of cut and raised pieces for positioning the yoke.

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