JP4430592B2 - motor - Google Patents

Description

  The present invention relates to a motor suitable for use in a pump motor that operates a plunger pump provided in an antilock brake system (ABS) for a vehicle, for example.

  As a brush holder used in this type of motor, there is one shown in FIGS. 17 and 18 (see, for example, Patent Document 1). As shown in FIGS. 17 and 18, the motor includes a bottomed cylindrical yoke 1 and a cover 2 that closes the opening 1 a by caulking a thin portion 1 b formed in the opening 1 a of the yoke 1. It has. A plurality of boss portions 1d, 1d are provided so as to face each other inside the cylindrical portion 1c of the yoke 1, and the brush holder 3 is attached between the boss portions 1d, 1d facing each other.

  The brush holder 3 includes an insulating brush holder stay 4 to which a brush accommodating portion 4a for accommodating a brush (not shown) is fixed, and a metal for caulking and fixing a claw portion 5a to a small hole 4b formed in the brush holder stay 4. It consists of the base of Then, by engaging the holes 5c formed in the bent portions 5b, 5b at both ends of the base 5 with the opposing boss portions 1d of the yoke 1, the brush holder 3 is moved in the axial direction and the circumferential direction. Is to regulate.

Japanese Utility Model Publication No. 58-40764

  However, in the yoke 1 of the conventional motor, after the hole 5c of the base 5 constituting the brush holder 3 is engaged with the boss 1d of the yoke 1, the cover 2 is fixed by caulking of the thin portion 1b of the yoke 1. As a result, the overall structure becomes complicated and the assembly work becomes complicated. Further, in the engagement between the hole 5c of the base 5 of the brush holder 3 and the boss 1d of the yoke 1, the base 5 rattles with respect to the yoke 1 and noise is generated, or it is accommodated in the brush accommodating portion 4a. Increased sliding resistance between the brush and the side wall of the brush housing portion 4a, that is, abnormal friction between the brush and the brush housing portion 4a was likely to occur. Furthermore, since the brush holder 3 is composed of the insulating brush holder stay 4 and the metal base 5, the number of parts increases, resulting in an increase in cost.

  Therefore, the present invention has been made to solve the above-described problems, and can easily and surely hold the brush holder between the yoke and the cover, and can prevent generation of abnormal noise and abnormal friction of the brush. An object is to provide a motor that can be surely prevented.

  The invention of claim 1 includes a bottomed cylindrical yoke and a cover into which the cylindrical portion is fitted into the opening of the yoke, and a bearing disposed at the center of the lower portion of the yoke and a ceiling portion of the cover. The armature shaft is rotatably supported by a bearing arranged in the center, and the armature and the commutator are respectively attached to the armature shaft at predetermined positions, and the brush holder is fitted into the cylindrical portion of the cover, and the brush holder can be retracted and retracted. In the motor in which the brush that is pressed against the commutator is provided, a boss portion is provided on the inner peripheral surface of the cylindrical portion of the yoke, and a locking projection portion that is locked to the boss portion is provided on the outer peripheral surface of the brush holder, In addition, a notch for accommodating the locking projection is provided in the cylindrical portion of the cover, and the locking projection of the brush holder is connected to the yoke. Scan section and the notch of the cover, characterized in that so as to sandwiched.

  A second aspect of the present invention is the motor according to the first aspect, wherein a plurality of the boss portions are formed at predetermined intervals on the inner peripheral surface of the cylindrical portion of the yoke, and the brush holder A plurality of the locking projections that are respectively locked to the plurality of boss portions are formed on the outer peripheral surface at a predetermined interval, and the plurality of locking projections are formed on the cylindrical portion of the cover. A plurality of notch portions to be respectively accommodated are formed at a predetermined interval.

A third aspect of the invention is the motor according to the first or second aspect, wherein the boss portion is integrally formed in a substantially V-shaped cross section on the inner peripheral surface of the cylindrical portion of the yoke by an extrusion process using a press. It is characterized by being.

A fourth aspect of the present invention is the motor according to any one of the first to third aspects, wherein the crushed bead portion is press-fitted into the outer peripheral surface of the brush holder to the inner peripheral surface of the cylindrical portion of the yoke. It is characterized by providing a plurality.

The invention according to claim 5 is the motor according to claim 4, wherein the plurality of crushing bead portions are formed on a plurality of protrusions integrally formed in the vicinity of the plurality of locking protrusions on the outer peripheral surface of the brush holder. It is characterized by being integrally formed.

  As described above, according to the first aspect of the present invention, the boss portion is provided on the inner peripheral surface of the cylindrical portion of the yoke, the locking projection portion that is locked to the boss portion is provided on the outer peripheral surface of the brush holder, and The cover holder is provided with a notch for accommodating the locking protrusion, and the holding protrusion of the brush holder is sandwiched between the boss of the yoke and the notch of the cover. It can be easily and reliably held between the yoke and the cover. As a result, the axial movement and circumferential movement of the brush holder with respect to the yoke can be reliably controlled to prevent rattling, and noise and abnormal friction of the brush can be reliably prevented. .

  According to the invention of claim 2, the plurality of locking projections provided on the outer peripheral surface of the brush holder are provided with the plurality of boss portions provided on the inner peripheral surface of the cylindrical portion of the yoke and the plurality of cylindrical portions of the cover. By being clamped by the notch, the brush holder can be easily, reliably and firmly held between the yoke and the cover. As a result, the movement of the brush holder in the axial direction and the circumferential direction with respect to the yoke can be more reliably regulated to prevent rattling, and it is possible to reliably prevent abnormal noise and abnormal brush friction. it can.

  According to the third aspect of the present invention, since the boss portion having a substantially V-shaped cross section is integrally formed on the inner peripheral surface of the cylindrical portion of the yoke by extrusion processing by a press, the boss portion can be formed easily and inexpensively.

  According to the invention of claim 4, by providing a plurality of crushing bead portions press-fitted into the inner peripheral surface of the cylindrical portion of the yoke on the outer peripheral surface of the brush holder, the movement of the brush holder in the circumferential direction is reliably restricted. As a result, it is possible to more reliably prevent backlash and to more reliably prevent the generation of abnormal noise and abnormal friction of the brush.

  According to the invention of claim 5, the plurality of crushing bead portions press-fitted into the inner peripheral surface of the cylindrical portion of the yoke are the plurality of protrusions integrally formed in the vicinity of the plurality of locking protrusions on the outer peripheral surface of the brush holder. In the same manner as in the effect of the fourth aspect of the present invention, the movement of the brush holder in the circumferential direction can be surely restricted to prevent backlash, and the generation of abnormal noise can be prevented. Abnormal friction of the brush can be prevented more reliably.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 is a side view showing a pump motor according to an embodiment of the present invention, FIG. 2 is a plan view of the pump motor, FIG. 3 is a bottom view of the pump motor, and FIG. 4 is a yoke of the pump motor. FIG. 5 is a sectional view showing a state before assembling the yoke, the brush holder and the cover, and FIG. 6 is a main part after assembling the yoke, the brush holder and the cover. FIG. 7 is an enlarged cross-sectional view of the main part showing the fitting state of the yoke and the brush holder, FIG. 8A is an enlarged cross-sectional view of the main part of the brush holder, and FIG. ) Is a plan view of the main part of the brush holder, FIG. 9 is a plan view of the brush holder, FIG. 10 is an enlarged cross-sectional view showing the relationship between the brush holder and the commutator attached to the armature shaft, and FIGS. Same pump It is a sectional view showing step-by-step motor of the assembly process.

  As shown in FIG. 1 to FIG. 3 and FIG. 16, a pump motor 10 as a motor is a metal-made bottomed cylindrical yoke 11 opened at one end side, and a cylindrical portion 12 d is fitted into the yoke opening portion 11 e. And a metal cover 12. A pair of magnets 13 and 13 are fixed to the inner peripheral surface 11d of the cylindrical portion 11c of the yoke 11 via an adhesive or the like. The armature shaft is composed of a ball bearing (bearing) 14 fitted in the central recess 11 b of the bottom 11 a of the yoke 11 and a ball bearing (bearing) 15 fitted in the central recess 12 b of the ceiling 12 a of the cover 12. Sixteen base ends 16a and midway portions 16b are rotatably supported.

  Further, as shown in FIGS. 1, 2, and 16, an eccentric eccentric shaft portion 16d is formed on the distal end portion 16c side of the armature shaft 16 exposed outside the through hole 12c of the recess 12b of the cover 12. A pair of ball bearings (bearings) 17 and 17 for driving the pump are attached to the eccentric shaft portion 16d by press-fitting. Each ball bearing 17 for driving the pump acts as a cam to drive, for example, a plunger pump (not shown) of the antilock brake system of the vehicle.

  As shown in FIG. 16, an armature 20 is attached at a position of the armature shaft 16 facing the pair of magnets 13 and 13. As shown in FIGS. 11 to 16, the armature 20 is fixed to the armature shaft 16 and wound around an armature core 20a having a coil winding portion 20b having a predetermined number of slots and a coil winding portion 20b of the armature core 20a. The armature coil 20c is rotated.

  Further, as shown in FIG. 16, a commutator 21 is fixed at a position of the armature shaft 16 facing the opening 11 e of the yoke 11. The commutator 21 includes the same number of commutator pieces 21a as the coil winding portion 20b of the armature core 20a. Each commutator piece 21a and one end 20d of the armature coil 20c are electrically connected to each other by a fusing method by a claw 21b formed on the commutator piece 21a.

  As shown in FIG. 16, a substantially disc-shaped brush holder 22 made of synthetic resin is fitted in a position facing the commutator 21 in the cylindrical portion 12 d of the cover 12 fitted in the opening 11 e of the yoke 11. is there. As shown in FIGS. 9 and 10, the brush holder 22 is formed with a plurality (four in this embodiment) of brush accommodating portions 22 a formed radially from the center. A brush 23 is housed in each brush housing portion 22a so as to be able to move in and out. The brush 23 is pressed and urged by a compression coil spring (biasing means) 24 so as to contact the commutator piece 21a of the commutator 21. Further, as shown in FIGS. 5 and 9 to 10, the upper opening edge 22 </ b> D of the through-hole 22 b of the brush holder 22 is in contact with the tip end surface 21 c of the commutator 21 and is relative to the tip side axial direction of the armature shaft 16. A pair of stoppers 22c, 22c for restricting general movement are integrally projected. As shown in FIG. 9, the pair of stoppers 22c and 22c are integrally formed in a rectangular plate shape at positions where the tips are arcuate and face each other.

  As shown in FIGS. 1, 2 and 9 to 16, the brush holder 22 is provided with power supply that is exposed in a cylindrical terminal lead portion 22 d that protrudes above the upper surface 22 </ b> A of the brush holder 22. Are embedded by insert molding or the like. A current is supplied to each brush 23 through each terminal 25. This current flows through the armature 20 or the like so that the armature shaft 16 rotates.

  Further, as shown in FIGS. 4 to 6 and FIG. 16, a boss portion 11f having a substantially V-shaped cross section with a predetermined interval is integrally formed on the inner peripheral surface 11d of the cylindrical portion 11c of the yoke 11 by an extrusion process using a press. Protrusions are formed. In the present embodiment, the boss portions 11f are formed on the inner peripheral surface 11d at intervals of 90 °. Furthermore, a plurality of locking projections 22f that are respectively locked to the boss portions 11f are formed on the outer peripheral surface 22e of the brush holder 22 so as to protrude at predetermined intervals. Further, the cylindrical portion 12d of the cover 12 is formed with a plurality of reverse concave cutout portions 12e for accommodating the respective locking projections 22f. As shown in FIG. 6, each locking projection 22 f of the brush holder 22 is sandwiched between each boss 11 f of the yoke 11 and each notch 12 e of the cover 12.

  Further, as shown in FIGS. 7 to 10, a plurality of protrusions 22 g are integrally formed in the vicinity of each locking protrusion 22 f of the outer peripheral surface 22 e of the brush holder 22. Each projection 22g is integrally formed with a crushing bead portion 22h that is press-fitted into the inner peripheral surface 11d of the cylindrical portion 11c of the yoke 11.

  2, 3, 5, and 16, a plurality of attachment holes 11 h are formed in the flange portion 11 g of the yoke 11. The pump motor 10 is fastened and fixed at a predetermined position of an antilock brake system of the vehicle, for example, via bolts (not shown) inserted through the mounting holes 11h.

  The assembly process of the pump motor 10 according to the embodiment will be described step by step with reference to FIGS.

  As shown in FIG. 11, a synthetic resin brush holder 22 in which the brush 23 is retractable is inserted from the distal end portion 16 c side of the armature shaft 16. Then, as shown in FIG. 12, a pair of stoppers 22 c and 22 c projecting from the upper opening edge 22 </ b> D of the through hole 22 b of the brush holder 22 so as to face each other in the center direction of the through hole 22 b are formed on one end surface 21 c of the commutator 21. It abuts and further insertion of the brush holder 22 is prevented. Therefore, a predetermined clearance t can be reliably ensured between the lower opening edge 22E of the through hole 22b of the brush holder 22 and the fusible claw 21b of the commutator piece 21a of the commutator 21. A predetermined clearance can also be secured between the lower surface 22B of the brush holder 22 and the armature coil 20c of the armature 20.

  Next, as shown in FIGS. 13 and 14, the bearing 15 disposed on the ceiling portion 12 a of the cover 12 is press-fitted to a predetermined position of the midway portion 16 b of the armature shaft 16, and the brush is applied to the cylindrical portion 12 d of the cover 12. The outer peripheral surface 22e of the holder 22 is fitted. At this time, the respective locking projections 22 f formed on the outer peripheral surface 22 e of the brush holder 22 are accommodated in the respective reverse recesses 12 e formed in the cylindrical portion 12 d of the cover 12.

  Next, as shown in FIGS. 15 and 16, the base end 16 a which is the other end of the armature shaft 16 is press-fitted into a ball bearing 14 fitted in the central recess 11 b of the bottom 11 a of the yoke 11, and the yoke The cylindrical portion 12d of the cover 12 is fitted into the cylindrical portion 11c of the eleventh. At this time, as shown in FIG. 6, each locking projection 22 f of the brush holder 22 is sandwiched between each boss 11 f of the yoke 11 and each notch 12 e of the cover 12, and the brush holder 22 is attached to the armature shaft 16. It is positioned reliably without moving in the axial direction.

  Further, each crushing bead portion 22h protruding from each projection 22g on the outer peripheral surface 22e of the brush holder 22 is pressed into the inner peripheral surface 11d of the cylindrical portion 11c of the yoke 11 and is crushed. It is reliably positioned in the radial direction in 11c.

  After that, as shown in FIG. 16, a pair of ball bearings 17 and 17 for driving the pump are press-fitted into the eccentric shaft portion 16d formed on the armature shaft 16, whereby the pump motor 10 shown in FIGS. Assembly is complete.

  As described above, the pair of stoppers 22c and 22c that abut the tip end surface 21c of the commutator 21 and restrict the movement of the armature shaft 16 in the axial direction are integrally formed on the upper opening edge 22D of the through hole 22b of the brush holder 22. Thus, the pair of stoppers 22c and 22c ensures a predetermined clearance t between the lower opening edge 22E of the through hole 22b of the brush holder 22 and the fusing claw 21b of the commutator piece 21a of the commutator 21. be able to. Thereby, the lower opening edge 22E of the through-hole 22b of the brush holder 22 does not contact the flawed claw 21b of the commutator piece 21a of the commutator 21. As a result, the fuzzing claw 21b of the commutator 21 due to contact with the brush holder 22 can be reliably prevented from rising, and the highly accurate pump motor 10 with stable electrical connection between the commutator 21 and the brush 23 can be obtained. It can be assembled smoothly in a short time.

  Further, as shown in FIG. 6, a boss portion 11 f having a substantially V-shaped cross section is integrally formed on the inner peripheral surface 11 d of the cylindrical portion 11 c of the yoke 11, and is engaged with the boss portion 11 f on the outer peripheral surface 22 e of the brush holder 22. The locking projections 22f are integrally projected, and the cylindrical portion 12d of the cover 12 is formed with notches 12e for receiving the locking projections 22f. The brush holder 22 can be easily and reliably held between the yoke 11 and the cover 12 by being sandwiched between the respective boss portions 11f and the notch portions 12e of the cover 12. Accordingly, the movement of the brush holder 22 in the axial direction and the circumferential direction with respect to the inner peripheral surface 11d of the cylindrical portion 11c of the yoke 11 can be reliably restricted to prevent rattling, and the occurrence of abnormal noise and brushing can be prevented. The abnormal friction 23 can be surely prevented.

  Furthermore, a plurality of crushing bead portions 22h that are press-fitted into the inner peripheral surface 11d of the cylindrical portion 11c of the yoke 11 are integrally formed on the outer peripheral surface 22e of the brush holder 22 so that the inner surface 11d of the cylindrical portion 11c of the yoke 11 protrudes. The movement of the brush holder 22 in the circumferential direction can be reliably controlled to prevent backlash, and the generation of noise and abnormal friction of the brush 23 can be more reliably prevented.

  Since the boss portion 11f having a substantially V-shaped cross section is integrally formed on the inner peripheral surface 11d of the cylindrical portion 11c of the yoke 11 by extrusion processing by pressing, the boss portion 11f can be formed easily and inexpensively.

It is a side view which shows the motor for pumps of one Embodiment of this invention. It is a top view of the said motor for pumps. It is a top view of the said motor for pumps. It is a front view which shows the state before the assembly | attachment of the yoke of the said motor for pumps, a brush holder, and a cover. It is sectional drawing which shows the state before the assembly | attachment of the said yoke, a brush holder, and a cover. It is an enlarged explanatory view showing the state of the main part after the yoke, the brush holder and the cover are assembled. It is an expanded sectional view of the principal part which shows the fitting state of the said yoke and a brush holder. (A) is an expanded sectional view of the principal part of the said brush brush holder, (b) is a top view of the principal part. It is a top view of the said brush holder. It is an expanded sectional view which shows the relationship between the said brush holder and the commutator attached to the armature shaft. It is sectional drawing which shows the state before inserting the said brush holder in an armature axis | shaft. It is sectional drawing which shows the state which inserted the said brush holder in the armature axis | shaft. It is sectional drawing which shows the state before fitting a cover to the said brush holder. It is sectional drawing which shows the state by which the cover was fitted by the said brush holder. It is sectional drawing which shows the state before fitting the cover fitted by the said brush holder to a yoke. It is sectional drawing which shows the assembly completion state of the said motor for pumps. It is sectional drawing of the brush holder used for the conventional motor. It is a disassembled perspective view of the said conventional brush holder.

Explanation of symbols

10 Motor for pump (motor)
11 Yoke 11a Bottom part 11c Cylindrical part 11d Inner peripheral surface 11e Opening part 11f Boss part 12 Cover 12a Ceiling part 12d Cylindrical part 12e Notch part 14, 15 Ball bearing (bearing)
16 Armature shaft 16d Eccentric shaft 17 Ball bearing
20 Armature 21 Commutator 22 Brush holder 22e Outer peripheral surface 22f Locking projection 22g Projection 22h Crushing bead 23 Brush

Claims (5)

  The armature includes a bottomed cylindrical yoke and a cover in which the cylindrical portion is fitted into the opening of the yoke, and a bearing disposed in the center of the bottom of the yoke and a bearing disposed in the center of the ceiling of the cover. A shaft is rotatably supported, and an armature and a commutator are respectively attached to predetermined positions of the armature shaft, and a brush holder is fitted into the cylindrical portion of the cover, and a brush housed in the brush holder is freely pressed against the commutator. In the motor, a boss portion is provided on the inner peripheral surface of the cylindrical portion of the yoke, a locking projection portion that is locked to the boss portion is provided on the outer peripheral surface of the brush holder, and the cylindrical portion of the cover A notch for receiving the locking projection is provided, and the locking projection of the brush holder is connected to the boss of the yoke and the cover. Motor is characterized in that so as to held between notch.   2. The motor according to claim 1, wherein a plurality of the boss portions are formed at predetermined intervals on the inner peripheral surface of the cylindrical portion of the yoke, and the plurality of boss portions are formed on the outer peripheral surface of the brush holder. A plurality of the locking projections that are respectively locked to the boss portions are formed at a predetermined interval, and the cylindrical portion of the cover has a plurality of notches that respectively accommodate the plurality of locking projections. A motor in which a plurality of parts are formed at predetermined intervals.   3. The motor according to claim 1, wherein the boss portion is integrally formed on the inner peripheral surface of the cylindrical portion of the yoke so as to have a substantially V-shaped cross section by an extrusion process using a press. Motor.   The motor according to any one of claims 1 to 3, wherein a plurality of crushing bead portions that are press-fitted into an inner peripheral surface of the cylindrical portion of the yoke are provided on the outer peripheral surface of the brush holder. Characteristic motor.   5. The motor according to claim 4, wherein the plurality of crushing bead portions are integrally formed on a plurality of protrusions integrally formed in the vicinity of the plurality of locking protrusions on the outer peripheral surface of the brush holder. A motor characterized by having

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