JP2006288171A - Motor for pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor for pumps in which terminals for feeding can be held simply and reliably to a brush holder without increasing the number of parts. <P>SOLUTION: In a motor for pumps, an armature shaft 16 is supported rotatably by a bearing 14 in the bottom of a yoke 11 and a bearing 15 in the ceiling of a cover 12, an armature 20 and a commutator 21 are mounted onto the armature shaft, a brush holder 22 is fitted into a cylindrical portion 12d of the cover 12, a brush 23 that has been retractably housed in the brush holder 22 is pressure welded onto the commutator 21, and a pair of terminals 18, 19 that provides power supply to the brush are arranged. A pair of terminal holding walls 22j, 22k for holding one terminal 18, to the brush holder 22 are integrally formed protrusively, and crushed beats 22q are integrally formed protrusively, into which the terminal 18 is press fitted on the inner surface where respective terminal holding walls 22j, 22k are opposed to each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  As a brush mounting structure used for this type of motor, there is one shown in FIGS. 20 to 22 (see, for example, Patent Document 1). As shown in FIG. 20, a holder base 4 is fixed to the gear case 1 of the motor via an annular damper 2 and a grommet-like damper 3. A through hole 4a through which an armature shaft (not shown) passes is formed in the center of the holder base 4, and a pair of terminal support holes 4b and 4b are formed on both sides thereof.

  As shown in FIG. 20 and FIG. 22, each pair of terminal support holes 4b, 4b penetrates the protruding pieces 5a of the pair of terminals 5 and 5 for power feeding, and at the tip of each protruding piece 5a. The bifurcated portion 5b is bent outward. In addition, as shown in FIG. 21, a plurality of positioning projections 5d are formed on the mounting portion 5c standing at the base end of each terminal 5, and each positioning projection 5d is made of a conductive plate and has an arc shape. After inserting into each positioning hole 6b formed in the base 6a of the brush holder 6, it is fixed by crimping.

  As shown in FIG. 20, a brush 7 is attached to each end portion 6c of the pair of brush holders 6 and 6, and each brush 7 is pressed against an armature commutator (not shown) to supply power. It has become.

Japanese Utility Model Publication No. 2-11974

  However, in the conventional motor, after the protruding piece 5a of the power supply terminal 5 with the brush holder 6 crimped and fixed is passed through the terminal support hole 4b of the holder base 4, the bifurcated portion 5b is bent outward. Since the terminal 5 is fixed, the terminal 5 is easily rattled with respect to the holder base 4. As a result, the terminal 5 may be detached from the holder base 4, and in this case, the terminal 5 or the brush holder 6 may come into contact with a motor case (housing) that also serves as a yoke or a metal cover, thereby causing a problem such as a short circuit. To do. In order to cope with this, it is conceivable to hold the terminal 5 on the holder base 4 via another member such as a holder. However, the number of parts increases correspondingly, which increases the cost.

  Therefore, the present invention has been made to solve the above-described problem, and a pump motor that can easily and reliably hold a power feeding terminal on a resin brush holder without increasing the number of parts. The purpose is to provide.

  The invention of claim 1 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 the center of the ceiling of the cover The armature shaft is rotatably supported by a bearing disposed in the armature, and an armature and a commutator are respectively attached to predetermined positions of the armature shaft, and a pump driving bearing is attached to the eccentric eccentric shaft portion of the armature shaft by press-fitting. In addition, in the pump motor in which a brush holder is fitted in the cylindrical portion of the cover, and a pair of terminals for supplying power to the brush is disposed, and the brush accommodated in the brush holder is press-contacted to the commutator. Both sides of at least one terminal of the pair of terminals on the brush holder A pair of terminal holding walls that integrally hold and a locking projection that is press-fitted on both sides of the one terminal on the opposing inner surfaces of the pair of terminal holding walls, respectively. The one terminal is held between the respective locking projections.

  The invention according to claim 2 is the pump motor according to claim 1, wherein a circular hole is formed in the other terminal of the pair of terminals, and the armature shaft is formed in the brush holder. An arc-shaped terminal holding wall into which the circular hole portion of the other terminal is fitted is formed around a through hole through which the other terminal penetrates, and the circular hole portion of the other terminal is formed on the outer peripheral surface of the arc-shaped terminal holding wall. The locking projection is press-fitted and formed integrally.

  As described above, according to the first aspect of the present invention, the pair of terminal holding walls that hold both side portions of at least one terminal of the pair of terminals are integrally formed on the brush holder, and the pair of terminal holding walls is formed. The locking projections into which both sides of one terminal are press-fitted are integrally formed on the inner surfaces facing each other, and one terminal is held between each of the locking projections. Both side portions of one terminal can be reliably held between the locking projections of the pair of terminal holding walls. Thereby, the detachment of one terminal with respect to the brush holder can be prevented with time, and the contact of the terminal with a conductive member such as a yoke or a cover can be reliably prevented. In addition, a pair of terminal holding walls are integrally formed on the brush holder, and a locking projection is integrally formed on the inner surface of each terminal holding wall, so that when holding the terminal on the brush holder, the holder and the like can be separated. A member becomes unnecessary, and accordingly, an increase in the number of parts for holding the terminal can be suppressed, and the cost can be reduced.

  According to the invention of claim 2, a circular hole is formed in the other terminal of the pair of terminals, and the circular hole of the other terminal is formed around the through hole formed in the brush holder through which the armature shaft passes. By integrally projecting the arc-shaped terminal holding wall into which the portion is fitted, and forming the locking convex portion into which the circular hole of the other terminal is press-fitted to the outer peripheral surface of the arc-shaped terminal holding wall, The circular hole portion of the other terminal can be reliably held by the locking convex portion of the arc-shaped terminal holding wall around the through hole of the brush holder. As a result, it is possible to prevent the other terminal from coming off the brush holder over time, and to reliably prevent contact of the terminal with a conductive member such as a yoke or a cover. In addition, an arc-shaped terminal holding wall is integrally formed around the through hole of the brush holder, and a locking projection is integrally formed on the outer peripheral surface of the arc-shaped terminal holding wall, so that the terminal on the brush holder A separate member such as a holder is not required when holding the terminal, and accordingly, an increase in the number of parts for holding the terminal can be suppressed, and the cost can be reduced.

  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. 10A is an enlarged plan view of a portion A in FIG. 9, and FIG. 10 is an enlarged plan view of the portion, FIG. 10C is a portion C in FIG. FIG. 11 (a) is an enlarged plan view of the portion D in FIG. 9, FIG. 11 (b) is an enlarged sectional view of the main part, and FIG. 12 shows a state where a pair of terminals are held on the brush holder. FIG. 13 is an enlarged cross-sectional view showing the relationship between the brush holder and the commutator attached to the armature shaft, and FIGS. 14 to 19 are cross-sectional views showing the assembly process of the pump motor step by step.

  As shown in FIG. 1 to FIG. 3 and FIG. 19, the pump motor 10 includes a metal-made bottomed cylindrical yoke 11 having an open end, and a metal in which a cylindrical portion 12 d is fitted into the opening 11 e of the yoke 11. And a cover 12 made of metal. 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 11b of the bottom 11a of the yoke 11 and a ball bearing (bearing) 15 fitted in the central recess 12b of the ceiling 12a of the cover 12. Sixteen base ends 16a and midway portions 16b are rotatably supported.

  Further, as shown in FIGS. 1, 2 and 19, an 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. 19, an armature 20 is attached to a position of the armature shaft 16 facing the pair of magnets 13 and 13. As shown in FIGS. 14 to 19, the armature 20 is fixed to the armature shaft 16 and wound around the armature core 20a having a coil winding portion 20b having a predetermined number of slots and the coil winding portion 20b of the armature core 20a. The armature coil 20c is rotated.

  Further, as shown in FIG. 19, 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. 19, a substantially disc-shaped brush holder 22 made of synthetic resin is fitted into 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 13, 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. As shown in FIGS. 5, 9, and 13, the upper opening edge 22 </ b> D of the through hole 22 b of the brush holder 22 is in contact with the distal end surface 21 c of the commutator 21 and is relative to the distal end 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. 12, 13, and 19, a pair of terminals 18, 19 for supplying power to the brush 23 are held on the upper surface 22 </ b> A of the substantially disc-shaped brush holder 22 made of synthetic resin. It is. That is, as shown in FIG. 9 to FIG. 12, both sides 18 a of one terminal 18 of the pair of terminals 18, 19 are located at positions facing each other across the through hole 22 b of the upper surface 22 </ b> A of the brush holder 22. A pair of long and short terminal holding walls 22j and 22k for holding 18a are integrally formed, and a terminal holding for holding both side portions 18a and 18a of one terminal 18 with an outer peripheral wall 22i at an intermediate position between them. The wall 22m is integrally formed.

  A crushing bead portion into which both side portions 18a, 18a of one terminal 18 are press-fitted on the inner surfaces of the pair of terminal holding walls 22j, 22k facing each other and the inner surface of the terminal holding wall 22m facing the outer peripheral wall 22i ( (Locking projections) 22q are integrally formed so that one flat plate-like terminal 18 is sandwiched between the crushing bead portions 22q. Note that a pair of protruding pieces (attachment piece portions) 18b and 18b bent downward are formed at the center and one end of one terminal 18, and the pair of protruding pieces 18b and 18b is a brush holder. 22 is press-fitted into a pair of terminal holding holes 22x, 22x. As shown in FIG. 13, the tip of a pigtail wire 23a connected to the brush 23 is connected to a predetermined position of one terminal 18 by welding or the like. Further, as shown in FIG. 11 (b), a tapered portion is formed on the upper portion of each crushed bead portion 22q.

  As shown in FIG. 12, a circular hole 19a is formed at the center of the other terminal 19 of the pair of terminals 18 and 19. Around the through hole 22b of the upper surface 22A of the brush holder 22, arc-shaped terminal holding walls 22n into which the circular holes 19a of the other terminal 19 are fitted are integrally projected at four locations at equal intervals. . A crushing bead portion (locking convex portion) 22q into which the circular hole portion 19a of the other terminal 19 is press-fitted is integrally formed on the outer peripheral surface of each arc-shaped terminal holding wall 22n. The other terminal 19 having a substantially planar A shape and a plate shape is held between the crushing bead portions 22q of the terminal holding wall 22n. A pair of protruding pieces (attachment piece portions) 19b, 19b bent downward are formed at predetermined positions outside the other terminal 19, and the pair of protruding pieces 19b, 19b are formed on the brush holder 22. The pair of terminal holding holes 22y, 22y are press-fitted. Further, a tapered portion is formed on the upper portion of each crushing bead portion 22q.

  Further, as shown in FIGS. 1, 2 and 9, and FIGS. 12 to 19, the brush holder 22 has a pair of external terminals 25, 25 for power feeding exposed in a cylindrical terminal lead portion 22d. It is buried by etc. A current is supplied to each brush 23 through the pair of external terminals 25, 25, the pair of terminals 18, 19 and the pigtail wire 23a. 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. 19, a substantially V-shaped boss portion 11 f is integrally formed on the inner peripheral surface 11 d of the cylindrical portion 11 c of the yoke 11 by an extrusion process by a press every 90 ° interval. Has been. Further, on the outer peripheral surface 22 e of the brush holder 22, locking projections 22 f that are locked to the respective boss portions 11 f are formed to protrude. In addition, the cylindrical portion 12d of the cover 12 is formed with a reverse concave cutout portion 12e that accommodates each locking projection 22f. As shown in FIG. 6, each locking projection 22 f of the brush holder 22 is held 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 9 and 13, a plurality of protrusions 22 g are integrally formed in the vicinity of each locking protrusion 22 f on 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 19, the flange 11 g of the yoke 11 has a plurality of attachment holes 11 h. 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. 14, 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. 15, a pair of stoppers 22 c and 22 c protruding 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 the 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. Also, a predetermined clearance t can 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. 16 and 17, 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. 18 and 19, the base end 16 a, which is the other end of the armature shaft 16, is press-fitted into the 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 held 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. 19, 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, so that the pump motor 10 shown in FIGS. Assembly is complete.

  Thus, 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 in a protruding manner. 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 11f is integrally formed on the inner peripheral surface 11d of the cylindrical portion 11c of the yoke 11, and the locking projection 22f is locked to the outer peripheral surface 22e of the brush holder 22 by the boss portion 11f. Are formed in the cylindrical portion 12d of the cover 12, and a notch 12e for receiving the locking projection 22f is formed in the cylindrical portion 12d of the cover 12, and each locking projection 22f of the brush holder 22 is connected to each boss 11f of the yoke 11. By holding between the notches 12e of the cover 12, the brush holder 22 can be easily and reliably held between the yoke 11 and 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.

  Further, as shown in FIGS. 9 and 12, a pair of long and short terminal holding walls 22j for holding both side portions 18a, 18a of one terminal 18 of the pair of terminals 18, 19 on the upper surface 22A of the brush holder 22, as shown in FIGS. 22k and the terminal holding wall 22m are integrally formed, and one terminal is provided on the inner surface of the pair of long and short terminal holding walls 22j and 22k and the inner surface of the terminal holding wall 22m facing the outer peripheral wall 22i. The crushing bead portions 22q into which the both side portions 18a, 18a of the 18 are press-fitted are integrally formed, and one terminal 18 is held between the crushing bead portions 22q, 22q. Each crushing bead part of long and short pair of terminal holding walls 22j and 22k and terminal holding wall 22m 2q, both side portions 18a of one of the terminals 18, the 18a can be reliably held between 22q. Thereby, the detachment of one terminal 18 with respect to the upper surface 22A of the brush holder 22 can be prevented with time, and the contact of the one terminal 18 with the conductive member of the yoke 11 or the cover 12 can be reliably prevented. Can do.

  In addition, a pair of long and short terminal holding walls 22j and 22k and a terminal holding wall 22m are integrally formed on the upper surface 22A of the brush holder 22, and a crushing bead portion 22q is formed on the inner surface of each terminal holding wall 22i, 22k and 22m. By forming each integrally projecting, a separate member such as a holder becomes unnecessary when holding the terminal 18 on the brush holder 22, and accordingly, an increase in the number of parts for holding the terminal can be suppressed, thereby reducing the cost. be able to.

  Further, as shown in FIGS. 9 and 12, a circular hole portion 19a is formed in the center of the other terminal 19 of the pair of terminals 18, 19, and the other hole 19b around the through hole 22b of the brush holder 22 is formed. Four arc-shaped terminal holding walls 22n into which the circular holes 19a of the terminals 19 are fitted are integrally projected at equal intervals, and the circular holes of the other terminal 19 are formed on the outer peripheral surface of each arc-shaped terminal holding wall 22n. Since the crushing bead portions 22q into which the portions 19a are press-fitted are integrally formed, the crushing bead portions 22q of the arc-shaped terminal holding walls 22n around the through holes 22b of the brush holder 22 are circular holes of the other terminal 19. The part 19a can be reliably held. Accordingly, it is possible to prevent the other terminal 18 from detaching with respect to the upper surface 22A of the brush holder 22 over time, and to reliably prevent contact of the other terminal 19 with the conductive member of the yoke 11 or the cover 12. Can do.

  Further, each arc-shaped terminal holding wall 22n is integrally projected around the through hole 22b of the brush holder 22, and a crushing bead portion 22q is integrally projected on the outer peripheral surface of each arc-shaped terminal holding wall 22n. As a result, when holding the other terminal 19 on the upper surface 22A of the brush holder 22, there is no need for a separate member such as a holder, and accordingly, an increase in the number of parts for holding the terminal can be suppressed, thereby reducing the cost. Can be planned.

The 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 bottom view of the pump motor. 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, brush holder and 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. 9A is an enlarged plan view of a portion A in FIG. 9, FIG. 9B is an enlarged plan view of a portion B in FIG. 9, and FIG. 10C is an enlarged plan view of a portion C in FIG. (A) is an enlarged plan view of a portion D in FIG. 9, and (b) is an enlarged cross-sectional view of the main part. It is a top view which shows the state which hold | maintained a pair of terminal on 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 a disassembled perspective view of the brush holder used for the conventional motor, a terminal, and a holder base. It is a top view which shows the attachment state of the said conventional holder base and a terminal. It is sectional drawing which shows the attachment state of the said conventional holder base and a terminal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pump motor 11 Yoke 11a Bottom part 11c Cylindrical part 11e Opening part 12 Cover 12a Ceiling part 14,15 Ball bearing (bearing)
16 Armature shaft 16d Eccentric shaft portion 17 Ball bearing
18, 19 Pair of terminals 18 One terminal 18a, 18a Both sides 19 Other terminal 19a Circular hole 20 Armature 21 Commutator 22 Brush holder 22j, 22k Pair of terminal holding walls 22m Terminal holding wall 22n Arc-shaped terminal holding wall 22q Crushing beat part (locking convex part)
23 Brush

Claims (2)

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, an armature and a commutator are respectively attached to predetermined positions of the armature shaft, and a pump drive bearing is attached to the eccentric shaft portion of the armature shaft by press-fitting, and in the cylindrical portion of the cover In a motor for a pump in which a brush holder is fitted, and a brush accommodated in the brush holder is freely brought into pressure contact with the commutator, and a pair of terminals for supplying power to the brush is disposed.
A pair of terminal holding walls for holding both side portions of at least one terminal of the pair of terminals are integrally projected on the brush holder, and both side portions of the one terminal are formed on opposing inner surfaces of the pair of terminal holding walls. The pump motor is characterized in that the locking projections into which the bolts are press-fitted are integrally formed to hold the one terminal between the locking projections. The pump motor according to claim 1,
A circular hole is formed in the other terminal of the pair of terminals, and the circular hole of the other terminal is fitted around a through hole formed in the brush holder through which the armature shaft passes. An arc-shaped terminal holding wall is integrally formed to project, and a locking convex portion into which the circular hole of the other terminal is press-fitted is integrally formed on the outer peripheral surface of the arc-shaped terminal holding wall. motor.

Images