JP2008206218A - Bracket fixing structure of yoke in rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To bring each caulking portion into uniform and stable fixed state without having any impact on the fixed state of a permanent magnet when a caulking pawl projecting from the opening end of a tubular yoke is caulked fixedly to a through hole bored in a bracket covering the opening end of the yoke. <P>SOLUTION: When a caulking pawl 2e formed at the opening edge 2d of a tubular yoke 2 is caulked fixedly to a caulking hole 3c bored in a bracket 3 covering the opening of the yoke 2, a jig inserting portion 2h is formed of a through hole between the caulking pawl 2e forming portion and the permanent magnet 6 bonding portion of the yoke 2, and a caulking receiving tool 10 is inserted into the jig inserting portion 2h in order to receive the caulking force when the caulking pawl 2e is caulked. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of a bracket fixing structure of a yoke in a rotating electrical machine constituting an actuator or the like mounted on a vehicle.

  In general, this type of rotating electrical machine has a configuration in which an end bracket (bracket) is fixed to an opening end of a cylindrical yoke. In this case, a fixing means (integrated) between the yoke opening end and the end bracket is integrated. As a means, a configuration is known in which a crimping piece is formed on one member, and the crimping piece is fixed to the other member by crimping.

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 conventional apparatus, when the insertion tips of the caulking claws are respectively caulked and fixed, one jig (caulking tool) constituting the caulking device is applied to the caulking claw side, and the other jig receiving the caulking force is applied. The tool (caulking receptacle) is caulked by applying it to the bottom piece of the yoke. For this reason, the caulking force acts over the entire length of the yoke in the cylinder length direction, and particularly when the yoke has a long cylinder length, the yoke is likely to be distorted. There is a problem in that there is a possibility that the yoke and the end bracket cannot be stably fixed due to variations in the crimped state of the crimping claw.
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.

SUMMARY OF THE INVENTION The present invention was created in view of the above circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is an opening of a cylindrical yoke in which a permanent magnet is fixed to an inner peripheral surface. A swivel claw projecting in the cylinder length direction is formed at the end, the claw claw is inserted into a through-hole formed in a bracket that covers the yoke opening end, and the insertion tip is caulked and fixed to the bracket. In an electric machine, a rotary electric machine is configured such that a jig insertion portion is formed on the yoke on the proximal side in the protruding direction of the crimping claw, and the crimping force when the crimping is fixed is received by a jig inserted into the jig insertion portion. It is the bracket fixing structure of the yoke in FIG.
The invention according to claim 2 is the bracket fixing structure of the yoke in the rotating electrical machine according to claim 1, wherein the jig insertion portion is formed to be located closer to the opening end side than the permanent magnet fixing portion.
A third aspect of the present invention is the bracket fixing structure for a yoke in a rotating electric machine according to the first or second aspect, wherein the jig insertion portion is constituted by a through hole.
According to a fourth aspect of the present invention, the jig insertion portion is constituted by a cut-and-raised hole formed by forming a cut-and-raised piece toward the inside of the cylinder. It is a bracket fixing structure.
According to a fifth aspect of the present invention, there is provided a bracket fixing structure for a yoke in a rotating electrical machine according to the first or second aspect, wherein the jig insertion portion is formed by a stepped concave portion provided in a stepped shape toward the axis side. It is.
According to a sixth aspect of the present invention, a brush holder fitted into the yoke is fixed to the bracket, and the brush holder has a locking claw that is locked in a locking hole provided in the bracket. The bracket fixing structure for a yoke in a rotating electrical machine according to any one of claims 1 to 5, wherein:

According to the first aspect of the present invention, the range of the yoke on which the caulking force acts can be reduced, the distortion of the yoke is prevented, each caulking fixed state is made uniform and stable, and the shaft core is reliable with high accuracy. High quality products can be provided.
According to the second aspect of the present invention, the caulking force does not act on the permanent magnet fixing portion of the yoke, and the stable fixing state of the permanent magnet can be maintained.
With the invention of claim 3, the configuration and processing can be simplified.
By setting it as invention of Claim 4, 5, a cover member can be made unnecessary.
According to the invention of claim 6, not only the incorporation of the brush holder stay into the end bracket is simplified, but also the axial center accuracy can be performed, and the reliability of the product can be further improved.

Next, embodiments of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes an electric motor disposed in a fuel supply path of a vehicle. The electric motor 1 rotates to a yoke 2, an end bracket 3 that covers a yoke opening end, and the yoke 2 and the end bracket 3. It is conventional to use a member such as an armature 5 provided with an armature shaft (motor shaft) 4 that is freely supported.

The yoke 2 is formed of a metal material into a bottomed cylindrical shape, and a bottom piece 2b is formed on the base end side of the cylindrical main body 2a in the cylinder length direction. A small-diameter bearing portion 2c 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 2c via the bearing 4a. Then, on the opening edge 2d of the yoke 2, crimping claws 2e extending toward the distal end side in the cylinder length direction are formed so as to project at a plurality of locations in the circumferential direction (four locations in the present embodiment). Each of these crimping claws 2e is formed in a bifurcated shape with a notch 2f formed in the circumferential direction intermediate portion of the protruding tip. Furthermore, a concave groove portion 2g is formed at the base end portion of each of the circumferentially opposite side pieces of the crimping claw 2e so as to cut out the opening end edge 2d of the yoke 2 toward the base end side.
A pair of circumferentially extending permanent magnets 6 is fixed to the inner peripheral surface of the yoke body 2a by an adhesive means, is on the proximal end side in the protruding direction of the crimping claw 2e of the yoke body 2a, and the permanent magnet The main body portion 2a located on the opening edge 2d side of the fixed portion 6 is provided with four through holes 2h located in the circumferential direction, and these through holes 2h are the jig insertion portions of the present invention. It corresponds to 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 set to be rotatably supported through a bearing 4b housed in the portion 3b. The main body 3a is set to abut against the opening edge 2d of the yoke 2 so as to close the opening of the yoke 2, and is formed on the yoke 2 on the outer periphery of the main body 3a as described later. Through-hole crimping holes 3c (corresponding to the through-holes of the present invention) 3c through which the crimping claws 2e are inserted and fixed are formed at four positions in the circumferential direction so as to face the crimping claws 2e. .
Further, on the inner diameter side of the caulking hole 3c, through-hole mounting holes 3d for fixing the brush holder 7 to be described later are opened at two locations in the circumferential direction, and terminals formed in the brush holder 7 are also formed. A through-shaped terminal insertion hole 3e through which the support portion 7a is inserted is opened at two locations in the circumferential direction.

  Further, the armature 5 is formed on a surface on which a plurality of coils are formed by fitting a plurality of core members 5a to the armature shaft 4 in a non-rotating manner and winding the windings 5b around the outer periphery of the core members 5a. The windings 5b of these coils are electrically connected to appropriate portions of the plurality of segments 8a in the circumferential direction of the commutator 8 that is externally fitted to the distal end side of the armature shaft 4 in a non-rotating manner. Yes. The armature 5 has a proximal end portion of the armature shaft 4 that is supported by the yoke bearing portion, a distal end portion that is supported in a penetrating manner by the end bracket bearing portion 3b, and a protruding distal end portion that protrudes from the end bracket body portion 3c to the distal end side. The actuator 4c is set to be fitted on the (penetrating tip) in a non-rotating manner.

The brush holder stay 7 includes a flat ring-shaped stay main body portion 7b that penetrates the armature shaft 4 and protrudes in the axial direction of the armature shaft 4 from the stay main body portion 7b. A support portion 7a is formed. Further, brush holders 7c are formed at two places in the circumferential direction on the base end side surface of the brush holder stay main body portion 7b. The brushes 9 can freely slide in the radial direction on these brush holders 7c, In addition, it is provided in a state of being pressed toward the armature shaft 4 side by an urging ammunition 9a supported by the stay body 7b. A terminal plate 9b 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 7b to the distal end side (outside). The brush holder stay 7 is formed with locking claws 7d protruding from the distal end side surface of the stay main body portion 7b toward the distal end side at two locations in the circumferential direction. The mounting holes 3d formed in the bracket 3 are set so as to be supported and fixed in a positioning manner to the end bracket 3 of the brush holder stay 7 by being respectively locked in a resilient and retaining shape. Has been.
Reference numeral 7e denotes a guide piece extending from the base end side surface of the stay main body portion 7b toward the base end side. The guide piece 7e is formed along the inner peripheral surface of the yoke main body portion 2a. Yes.

Then, while supporting and fixing the brush holder stay 7 to the end bracket 3, the end portion of the armature shaft 4 of the armature 5 is supported by the bearing portion 3 b of the end bracket 3, and the state shown in FIG. The yoke 2 is incorporated.
That is, as shown in FIGS. 1 and 5, the yoke 2 is arranged around the circumference of the yoke 2 and the end bracket 3 by inserting the corresponding crimping claw 2 e on the yoke 2 side into each crimping hole 3 c of the end bracket 3. It is set to be incorporated in a state where the direction is positioned. In this assembled state, each crimping claw 2e is crimped using a crimping device. At this time, the jig insertion portion 2h formed on the proximal end side of each crimping claw 2e constitutes the crimping device, While the tip of the prism-shaped receiving jig (hereinafter referred to as a crimping fixture) 10 that receives the crimping force is inserted from the outside of the cylinder to the inside of the cylinder, the crimping tool is inserted into the tip of the crimping claw 2e. 11 are set so as to abut each other. The caulking tool 11 has an abutting part formed with an insertion part to be inserted into the notch part 2f of the locking claw 2e. By pressing the caulking tool 11 toward the caulking receiver 10 side, the notch part is formed. The crimping claw 2e is deformed (open and crimped) so that 2f is pushed and spread, and the deformed crimping claw 2e interferes with (locks to) the edge of the crimping hole 3c as shown in FIG. It is set to become. As described above, the crimping claw 2e is set so that the crimping claw 2e can be crimped to the end bracket 3 by pressurizing the crimping tool 11. In this case, the crimping force by pressing the crimping tool 11 is the edge of the yoke opening. It is received by the caulking support 10 inserted into the jig insertion part 2h via the part from the part 2d to the jig insertion part 2h. Thus, the caulking force by the caulking tool 11 does not act on the yoke body portion 2a on the side closer to the base end than the jig insertion portion 2h of the yoke 2 and to which the permanent magnet 6 is fixed. .

Here, since the jig insertion part 2h located in the base end side of each said crimping claw 2e is comprised so that the crimping receptacle 10 may be inserted in a cylinder, the crimping claw 2e and the jig insertion part 2h Is formed at a position where the terminal support 7a, the brush holder 7c, the guide piece 7e, and the urging ammunition 9a arranged on the brush holder stay 7 do not interfere with each other. For this reason, all the intervals between the caulking claws 2e adjacent in the circumferential direction are not the same.
The jig insertion portion 2h is covered with a means such as adhering a cover member 12 (for example, a sealing tape material) as appropriate after the end bracket 3 is caulked and fixed to the yoke 2. Thus, a problem that foreign matter enters the yoke 2 is prevented.

  In the present embodiment configured as described above, a caulking claw 2e protruding in the cylinder length direction from the opening edge 2d on the tip end side of the yoke 2 is inserted into a caulking hole 3c formed in the end bracket 3 and fixed by caulking. The end bracket 3 is fixed to the yoke 2, and in this case, the crimping force for crimping the crimping claw 2 e (the crimping force based on pressurizing the crimping tool 11) is a jig formed on the yoke 2. It is received by the caulking support 10 inserted into the yoke 2 from the insertion portion 2h. As a result, the distance between the caulking tool 11 (caulking claw 2e) and the caulking support 10 is shortened, and the entire yoke 2 may be distorted like a conventional caulking force on the bottom piece side. In addition, the caulking fixing state of each caulking claw 2e can be made uniform and stable, and the axial center accuracy between the yoke 2 and the end bracket 3 with respect to the armature shaft 4 is improved. Reliability can be improved.

  Further, in the embodiment of the present invention, the portion into which the caulking support 10 of the yoke 2 is inserted is located on the opening edge 2d side from the portion to which the permanent magnet 8 is fixed. The caulking force does not act on the portion where the magnet 8 is fixed, and the permanent magnet 8 is fixed regardless of whether the permanent magnet 8 is adhered or fixed using an attachment member. By passing through the process, it is possible to eliminate a problem that a change occurs in the fixed state of the permanent magnet 8.

  In addition, in this case, the jig insertion portion 2h is configured by a through hole formed in the yoke 2, and the jig insertion portion 2h (through hole) is covered by the cover member 12 after the caulking process. While there is no possibility that foreign matter may enter the inside, the configuration and processing can be easily performed.

  Further, the brush holder stay 7 needs to be arranged between the end bracket 3 and the yoke 2 with high axial accuracy. However, in the case where the present invention is implemented, the brush holder stay 7 is not attached to the end bracket 3. Since the locking claw 7d is incorporated in the mounting hole 3d so as to be locked in a pressure-like manner and a retaining shape, it can be arranged in a positioning shape, so that the brush holder stay 7 is attached to the end bracket 3. Not only can the assembly be simplified, but also the shaft accuracy can be improved, and the reliability of the product can be further improved.

Of course, the present invention is not limited to the above-described embodiment, and may be the second and third embodiments shown in FIGS. 7A and 7B.
The jig insertion portion 13a formed in the yoke 13 of the second embodiment does not form a through hole as in the first embodiment, but leaves the base side of the through hole corresponding portion. The three sides are cut out and the tip side 13b is cut up and raised until it is located on the inner side (axial side) of the cylinder than the inner peripheral surface of the yoke 13.
Further, the jig insertion portion 14a formed in the yoke 14 of the third embodiment is formed in the same manner as in the second embodiment, but when the jig insertion portion 14a is cut up inside the cylinder, Further, it is cut and raised so that there is no gap between the tip side 14b and the inner peripheral surface of the yoke 14, and a jig insertion space substantially corresponding to the thickness of the yoke 14 is formed on the outer peripheral surface of the yoke 14. ing.
By doing so, the receiving jigs (caulking receptacles) 15 and 16 can be inserted into the jig insertion portions 13a and 14a. When the caulking claws 13c and 14c are caulked by the jig, The generated caulking force can be received, the entire yoke 13 and 14 is not distorted, and a highly reliable product in which the caulking claws 13c and 14c are in a stable caulking fixed state can be provided. In addition, in these devices, since the large holes are not formed in the yokes 13 and 14, it is not necessary to dare to provide a cover member for preventing foreign matter mixture, and the number of components can be reduced.

  Furthermore, as the jig insertion portion, a recess may be formed in a state where a step corresponding to the thickness of the yoke is formed toward the inside of the cylinder, and in this case, a cover member can be omitted.

1A, 1B, and 1C are a side view, a rear view, and a side sectional view of an electric motor before a caulking process, respectively. 2 (A), 2 (B), 2 (C) and 2 (D) are respectively a front view of the yoke, an XX sectional view and a rear view of FIG. 2 (A), and a YY sectional view of FIG. 2 (B). It is. 3 (A), (B), (C), and (D) are a front view, a rear view, and a cross-sectional view taken along line XX in FIG. 3 (B), with the brush holder stay incorporated in the end bracket, respectively. It is YY sectional drawing of (B). It is side surface sectional drawing in the state which incorporated the armature in the end bracket. It is side surface sectional drawing explaining the state which crimps and fixes a yoke to an end bracket. 6A, 6B, and 6C are respectively a front view of the electric motor, a cross-sectional view taken along line XX in FIG. 6A, and a view taken in the direction of the arrow Y in FIG. FIGS. 7A and 7B are partial side cross-sectional views illustrating the jig insertion portions of the second and third embodiments, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Yoke 2e Caulking claw 2h Jig insertion part 3 End bracket 3c Caulking hole 5 Armature 7 Brush holder stay 7c Brush holder 8 Commutator 9 Brush 10 Caulking receptacle 11 Caulking tool

Claims (6)

  A caulking claw projecting in the cylinder length direction is formed at the opening end of the cylindrical yoke to which the permanent magnet is fixed on the inner peripheral surface, and the caulking claw is inserted into a through hole provided in a bracket that covers the yoke opening end. In the rotating electrical machine in which the insertion tip is caulked and fixed to the bracket, a jig insertion portion is formed on the yoke on the proximal end side in the protruding direction of the caulking claw, and the caulking force when the caulking is fixed is determined by the jig. A bracket fixing structure of a yoke in a rotating electrical machine configured to be received by a jig inserted into an insertion portion.   The bracket fixing structure for a yoke in a rotating electrical machine according to claim 1, wherein the jig insertion portion is formed at a position closer to the opening end than the permanent magnet fixing portion.   The bracket fixing structure for a yoke in a rotating electrical machine according to claim 1, wherein the jig insertion portion is configured by a through hole.   The bracket fixing structure for a yoke in a rotating electrical machine according to claim 1 or 2, wherein the jig insertion portion is formed by a cut-and-raised hole formed by forming a cut-and-raised piece toward the inside of the cylinder.   The bracket fixing structure for a yoke in a rotating electric machine according to claim 1 or 2, wherein the jig insertion portion is configured by a step-shaped recess that is recessed in a step shape toward the axis side.   A brush holder fitted into the yoke is fixed to the bracket, and the brush holder is formed with a locking claw that is locked in a locking hole formed in the bracket. The bracket fixing structure of the yoke in the rotary electric machine of any one of 1 thru | or 5.

Images