JP5091038B2 - Motor structure - Google Patents

Description

  The present invention relates to a motor structure that is assembled by engaging a stator and a housing.

  2. Description of the Related Art Conventionally, there are two parts to be assembled which are provided with a wrong assembly prevention means (see, for example, Patent Documents 1 and 2).

  In Patent Document 1, the scroll compressor is provided with positioning pins and pin holes at positions (two places) shifted on the same side from the reference plane passing through the center line of the circular fixed scroll or the main bearing housing. The positioning pins are positioned by engaging with the pin holes.

In patent document 2, the assembly direction of the stator to the motor cover is uniquely determined by providing a plurality of engaging portions on the first cover attached to one surface of the stator.
JP-A-10-61567 JP 2005-315645 A

  However, since the fixed scroll and the main bearing housing of Patent Document 1 have the same two positioning pins and pin holes, one positioning pin engages with the other pin hole when rotated and misassembled. Thus, the fixed scroll and the main bearing housing are close to each other.

  Moreover, in the motor of patent document 2, the means which prevents a stator and a motor cover from approaching at the time of incorrect assembly | attachment is not disclosed.

  In the present invention, when the housing and the stator are mistakenly assembled, the power feeding portion of the housing can be prevented from coming into contact with the circuit board of the stator and the electronic components can be prevented from being damaged, and the housing and the stator components can be reassembled. It aims at obtaining the motor structure which becomes.

  According to a first aspect of the present invention, there is provided a motor structure including a cylindrical housing provided with a power feeding portion fed from a power source and having end portions as mating surfaces, a connection portion connected to the power feeding portion, and the power feeding portion. And a circuit board to which power is supplied through the connecting portion, and a rotating magnetic field is generated by the power supply to rotate the rotor, and the end portion is a mating surface to be mated with the mating surface. A stator, a first engagement portion formed in the housing, and a first engaged portion formed in the stator and engaged with the first engagement portion at a regular assembly position of the housing and the stator; A second engagement portion formed at a position different from the first engagement portion of the housing, and formed at the stator, and engaged with the second engagement portion at a regular assembly position of the housing and the stator. A second engaged portion to When the first engaging portion and the first engaged portion, and the second engaging portion and the second engaged portion are engaged, the mating surface and the mating surface come into contact with each other, and None of the first engaging portion and the second engaged portion, and the second engaging portion and the first engaged portion are engaged.

  According to the above configuration, when the stator and the housing are assembled at the regular assembly position, the first engaging portion and the first engaged portion are engaged, and the second engaging portion and the second engaged portion are engaged. Are engaged so that the mating surface and the mating surface come into contact with each other. As a result, the connection portion is connected to the power supply portion, and power can be supplied to the circuit board.

  On the other hand, when the assembly position of the stator and the housing is wrong and both the first engaging portion and the second engaged portion and the second engaging portion and the first engaged portion are to be engaged, The mating surface and the mating surface do not come into contact with each other, and the stator and the housing do not approach each other. As a result, it is possible to prevent the electric power supply portion of the housing from coming into contact with the circuit board of the stator and damage the electronic components and the like, and the housing and the stator components can be reassembled.

  According to a second aspect of the motor structure of the present invention, the first engaging portion includes a pair of first concave portions spaced apart by a distance d1 in the circumferential direction of the mating surface of the housing. The engaging portion is composed of a pair of first convex portions spaced apart by a distance d1 in the circumferential direction of the mating surface of the stator, and the second engaging portion is a circumferential direction of the mating surface of the housing And a pair of second protrusions spaced apart by a distance d2 in the circumferential direction of the mating surfaces of the stator. It consists of

  According to the above configuration, when the first convex portion and the second concave portion, the second convex portion and the first concave portion are erroneously engaged, the circumferential distances d1 and d2 of the respective portions are different. For example, when d1 <d2, the second convex portion comes into contact with the mating surface and the stator does not approach the housing. As a result, it is possible to prevent the electric power supply portion of the housing from coming into contact with the circuit board of the stator and damage the electronic components and the like, and the housing and the stator components can be reassembled.

  In the motor structure according to claim 3 of the present invention, the position of the power feeding portion is offset in the radial direction from the center position of the housing, and the position of the connection portion connected to the power feeding portion is the center position of the stator. Is offset in the radial direction.

  According to the above configuration, when the stator and the housing are assembled, if one of them is accidentally rotated and the stator or the housing is assembled at a position different from the regular assembly position, the position of the power feeding unit is Since the position of the connecting portion is offset in the radial direction from the center position of the housing and the position of the connecting portion is offset in the radial direction from the center position of the stator, the power feeding portion and the connecting portion are centered on the center position of the housing and the stator. Arranged at two different points on the circumference. Thereby, it can prevent that an electric power feeding part and a connection part contact a halfway halfway.

  According to a fourth aspect of the present invention, there is provided the motor structure, wherein the first engaging portion, the first engaged portion, the second engaging portion, and the second engaged portion are provided on the housing and the stator. Exposed outside.

  According to the above configuration, when the housing and the stator are erroneously assembled, the engagement state of the first engaging portion, the first engaged portion, the second engaging portion, and the second engaged portion can be visually recognized from the outside. Therefore, it becomes easy to determine the incorrect assembly state.

  In the motor structure according to claim 5 of the present invention, the first engaging portion and the first engaged portion, and the second engaging portion and the second engaged portion are engaged at a normal assembly position. The housing and the stator are provided with a retaining portion and a retaining portion that can be engaged when coming into the retaining position.

  According to the above configuration, when the first engaging portion and the first engaged portion, and the second engaging portion and the second engaged portion are engaged at the normal assembly position, the retaining portion and Since the stopper part is engaged, it is possible to determine whether or not the assembled state of the housing and the stator is correct only by confirming the engagement state between the stopper part and the stopper part. This facilitates confirmation of incorrect assembly.

  In the motor structure according to claim 6 of the present invention, the to-be-prevented portion is composed of two recessed portions formed apart from each other in the circumferential direction leaving a wall portion in between, and the preventing portion is the wall. It consists of two convex parts that protrude from both circumferential ends of the peripheral wall part and engage with the two concave parts, respectively, leaving a peripheral wall part facing the part.

  As a comparative example, for example, it is assumed that there is a motor structure in which the part to be secured is a concave part at one place, and the part to be secured is two convex parts facing each other. In the motor structure of the comparative example, when two convex portions are bent by caulking or the like and engaged with the concave portion, the peripheral wall of the stator where the convex portion is bent continuously disappears with a width corresponding to the two convex portions. It becomes. For this reason, a housing and a stator do not contact in this part, and the contact area of a housing and a stator reduces. Furthermore, since the area | region where a housing and a stator contact continuously and the area | region which does not contact are unevenly distributed in the circumferential direction, arrangement | positioning balance of the contact area (or area | region which does not contact) of a housing and a stator worsens. For these reasons, the backlash at the time of assembling the stator to the housing increases.

  On the other hand, according to the above-described configuration of the present invention, when the two concave portions and the two convex portions are engaged by caulking or the like, the peripheral wall of the portion where each convex portion is bent disappears in the width of one convex portion. The maximum width of the opening formed in the peripheral wall is the width of one protrusion, which is smaller than the comparative example. Thereby, the contact area of a housing and a stator can be increased. Furthermore, since the concave portion and the convex portion are formed at two locations in the circumferential direction, the region where the housing and the stator are continuously in contact and the region where the housing and the stator are not in contact are less likely to be unevenly distributed in the circumferential direction as compared with the comparative example. Therefore, the arrangement balance of the contact area (or the non-contact area) between the housing and the stator is improved. For these reasons, the backlash at the time of assembling the stator to the housing can be suppressed as compared with the comparative example.

  A first embodiment of the motor structure of the present invention will be described with reference to the drawings.

  FIG. 1 shows an overall configuration of a fluid pump device P1 to which a motor structure 10 according to a first embodiment of the present invention is applied. The fluid pump device P1, for example, is suitably used as an electric water pump that circulates LLC (Long Life Coolant) in order to cool an automobile engine, and in the motor axial direction (Z1 or Z2). A pump unit 12 and a motor unit 14 arranged side by side are provided.

  The pump unit 12 has a substantially cylindrical pump housing 16. On the other hand, the motor unit 14 includes a substantially cylindrical pump body 18 and a motor housing 20 fixed to one end of the pump body 18. The pump housing 16 and the pump body 18 are fixed by welding. Further, both ends of the motor shaft 22 are fixed to substantially the center portions of the pump housing 16 and the pump body 18 along the motor axial direction. A bearing member 23 is externally attached to the motor shaft 22.

  A pump chamber 24 is provided inside the pump housing 16. The pump housing 16 is provided with a suction port 26 and a delivery port 28 that are spaced apart from each other by a predetermined distance in the motor axial direction and extend along a tangential direction intersecting the motor axial direction. The suction port 26 and the delivery port 28 are each in communication with the pump chamber 24.

  An impeller 30 composed of a plurality of blades is disposed in the pump chamber 24. The impeller 30 has a plate-like blade portion projecting from the motor shaft 22 in the radial direction via the bearing member 23, and is rotatable about the motor shaft 22. The bearing member 23 and the impeller 30 are integrated in advance by fitting and adhesion.

  On the other hand, the motor unit 14 is provided with a stator 32, a rotor 34, and a control circuit 36 in the above-described pump body 18 and motor housing 20.

  The stator 32 is formed in an annular shape having a through hole 38 formed in the motor axial direction, and integrally includes an armature (an armature) including a core (not shown), a coil 60, and the like. . On the motor housing 20 side of the stator 32, an annular peripheral wall portion 40 that protrudes toward the motor housing 20 is formed.

  The pump body 18 includes an inner cylinder portion 42 and an outer cylinder portion 44. A support portion 48 is provided on the bottom 46 of the inner cylinder portion 42, and the motor shaft 22 is supported on the support portion 48. In the pump body 18, an annular accommodation hole 50 is provided between the inner cylinder portion 42 and the outer cylinder portion 44. The stator 32 is press-fitted and accommodated in the accommodation hole 50 in a state where the inner cylinder portion 42 is press-fitted into the through hole 38 of the stator 32.

  The rotor 34 includes a magnet (not shown) and extends from the impeller 30 into the inner cylindrical portion 42 of the pump body 18 in a non-contact manner. The rotor 34 is integrated with the impeller 30 and is rotatably supported by the motor shaft 22 via the bearing member 23.

  The control circuit 36 has a configuration in which various electronic components are mounted on a circuit board 52 fixed in the stator 32, and a female terminal 54 is provided at an end of the circuit board 52. The female terminal 54 is configured to be connected to a substantially S-shaped male terminal 56 at a regular assembly position of the stator 32 and the motor housing 20. The male terminal 56 is connected to a connector 58 provided on the motor housing 20. Further, the control circuit 36 is electrically connected to the coil 60.

  The position of the female terminal 54 is a position offset in the radial direction from the center (center line M) of the stator 32 by a distance d3, and the position of the male terminal 56 is a distance from the center of the motor housing 20 in the radial direction. The position is offset at d3 (see FIG. 5C). Here, the control circuit 36 is connected to an external control device (not shown) having a power source via the female terminal 54, the male terminal 56, and the connector 58. And it is set as the structure which supplies an electric current to the coil 60 according to the control signal input from the external control apparatus.

  In the fluid pump device P1, when a control signal is output from the external control device, the stator 32 generates a rotating magnetic field, and the impeller 30 is rotated together with the rotor 34 by the rotating magnetic field. Then, due to the rotation of the impeller 30, a low pressure portion is generated in the pump chamber 24, and fluid is sucked into the pump chamber 24 from the outside of the fluid pump device P1 through the suction port 26. At the same time, the fluid in the pump chamber 24 is pressurized by centrifugal force by the rotation of the impeller 30 and is sent to the outside through the delivery port 28.

  Next, the configuration of each part of the fluid pump device P1 will be described in more detail.

  FIG. 2 shows a state in which the fluid pump device P1 is disassembled into the pump body 18, the stator 32, and the motor housing 20. Engagement protrusions 62 projecting radially outward are provided at four locations at equal intervals in the circumferential direction on the motor housing 20 side of the pump body 18. Further, on the outer periphery of the motor housing 20, four engagement pieces 64 configured to be elastically deformable in the radial direction are erected at equal intervals in the circumferential direction. Here, when the stator 32 and the motor housing 20 are assembled to the pump body 18, the engaging protrusions 62 engage with the corresponding engaging pieces 64, so that the stator 32 and the motor housing 20 are fixed to the pump body 18. Is done.

  FIG. 3A shows the stator 32 with the control circuit 36 removed. The stator 32 has a cylindrical yoke 68 as a housing, and the above-described armature 59 is accommodated in the yoke 68. The yoke 68 has a mating surface 70 at the peripheral edge of the opening on the motor housing 20 side, and a pair of opposed first notches cut into a substantially rectangular shape from the mating surface 70 to the opposite side of the motor housing 20. A portion 72 and a second cut portion 74 are formed.

  Further, on the side closer to the second cut portion 74 than the first cut portion 72 on the circumference of the mating surface 70, the same cut out in a substantially rectangular shape from the mating surface 70 to the opposite side of the motor housing 20. A third cut portion 76 and a fourth cut portion 78 having a width are formed.

  Here, the first side wall 80 and the second side wall 82 sandwich the first cut portion 72 by dividing the aforementioned peripheral wall portion 40 by the four cut portions of the first cut portion 72 to the fourth cut portion 78. A third side wall 84 and a fourth side wall 86 sandwiching the second cut portion 74 are formed.

  The first side wall 80 and the second side wall 82 respectively have substantially rectangular first projections 88A and 88B from the mating surface 70 on the first cutout 72 side toward the motor housing 20 side (upward in the drawing). Projected. The first convex portions 88 </ b> A and 88 </ b> B are spaced apart by a distance d <b> 1 in the circumferential direction of the mating surfaces 70.

  Further, from the mating surface 70 of the third side wall 84 on the third notch portion 76 side and the mating surface 70 of the fourth side wall 86 on the fourth notch portion 78 side, respectively, toward the motor housing 20 side, The substantially rectangular second convex portions 90A and 90B are projected. The second convex portions 90 </ b> A and 90 </ b> B are spaced apart by a distance d <b> 2 in the circumferential direction of the mating surfaces 70. Here, distance d2> distance d1 is set.

  On the side close to the third cutout 76 of the first side wall 80 and on the side close to the fourth cutout 78 of the second side wall 82, caulking portions as retaining portions cut out in a substantially C-shape are respectively provided. 92A and 92B are formed.

  On the other hand, FIG. 3B shows the motor housing 20 with the stator 32 removed. In the motor housing 20, the above-described engagement piece 64 is erected on the outer periphery of the disc-shaped bottom portion 93. Further, when the stator 32 and the motor housing 20 are assembled to the inner side (center side) of the engagement piece 64 of the bottom portion 93, the first side wall 80, the second side wall 82, the third side wall 84, and the second side of the stator 32 are assembled. A first wall portion 94, a second wall portion 95, a third wall portion 96, and a fourth wall portion 97, on which the four side walls 86 are extrapolated, are erected.

  An annular groove 99 having a predetermined width is formed between the four engagement pieces 64 and the first wall portion 94 to the fourth wall portion 97. The lower end of the aforementioned pump body 18 (see FIG. 2) is placed in the groove 99. In addition, the outer peripheral surfaces of the first wall portion 94 to the fourth wall portion 97 are formed with steps that protrude outward in the radial direction at the same height, and are aligned with the mating surface 70 of the yoke 68 described above. Is provided.

  First concave portions 104A and 104B that are recessed in a substantially rectangular shape from the mating surface 102 to the bottom portion 93 side are formed at the ends of the outer peripheral surfaces of the first wall portion 94 and the second wall portion 95 that are close to each other. Similarly, as shown in FIG. 5B, the end portions of the outer peripheral surfaces of the third wall portion 96 and the fourth wall portion 97 that are close to each other are recessed in a substantially rectangular shape from the mating surface 102 to the bottom portion 93 side. Second recesses 106A and 106B are formed.

  As shown in FIG. 3B, the above-described male terminal 56 is provided at the bottom 93 of the motor housing 20 on the inner side of the first wall portion 94 to the fourth wall portion 97. A breathing portion 66 is provided on the opposite side of the center of the bottom portion 93 from the male terminal 56 to suppress a pressure difference caused by the difference between the outside air temperature and the internal temperature of the motor housing 20. Further, a pair of substantially semicircular side wall portions 98 </ b> A and 98 </ b> B project from the bottom portion 93 with the male terminal 56 and the breathing portion 66 interposed therebetween.

  As shown in FIG. 4, on the outer peripheral surface of the side wall portion 98A of the motor housing 20, when the stator 32 is assembled at the regular assembly position, the crimp portion 92A is located at a position (prevention position) that faces the crimp portion 92A. A concave portion 108A is formed as a to-be-removed portion having a size capable of entering. In addition, although the recessed part 108B of the magnitude | size into which the crimping | crimped part 92B can approach similarly is formed also in the outer peripheral surface of the side wall part 98B, illustration is abbreviate | omitted.

  As described above, the motor structure 10 includes the motor housing 20 provided with the male terminal 56 and the end portion serving as the mating surface 102, the female terminal 54, the circuit board 52, and the mating surface 70. And a stator 32. The motor housing 20 is provided with first concave portions 104A and 104B and second concave portions 106A and 106B, and the stator 32 has first convex portions 88A and 88B and second convex portions 90A and 90B. Is provided.

  Next, the operation of the embodiment of the present invention will be described. First, the assembled state of the motor housing 20 and the stator 32 at the regular assembly position will be described.

  As shown in FIG. 5A, when the motor housing 20 and the stator 32 are assembled at the regular assembly position, the first recess 104A, the first projection 88B, the first recess 104B, and the first The convex portions 88A engage with each other. At the same time, as shown in FIG. 5B, on the back surface side, the second concave portion 106A and the second convex portion 90A, and the second concave portion 106B and the second convex portion 90B are engaged. As a result, the mating surface 102 of the motor housing 20 and the mating surface 70 of the stator 32 come into contact with each other, and the stator 32 is supported by the motor housing 20.

  At this time, as shown in FIG. 5C, since the stator 32 and the motor housing 20 are close to each other at the correct assembly position, the tip of the male terminal 56 enters the female terminal 54, and the male terminal 56 and the female terminal 54 are Electrically connected. Furthermore, in this regular assembly position, as shown in FIG. 6, since the caulking portion 92A is disposed at the position of the recess 108A (prevention position), the stator 32 is attached to the motor housing 20 by caulking the caulking portion 92A. Fixed to. The above-described pump body 18 (see FIG. 2) is extrapolated and assembled in this assembled state, and the assembly of the fluid pump device P1 is completed.

  Next, the assembled state of the motor housing 20 and the stator 32 at the erroneous assembly position will be described. Here, as an example, a case will be described in which the operator mistakenly rotates the stator 32 by 180 ° and is assembled to the motor housing 20.

  As shown in FIG. 7, when the second convex portions 90A and 90B of the stator 32 are to be assembled toward the first concave portions 104A and 104B of the motor housing 20, the distance (distance) between the second convex portions 90A and 90B is determined. Since d2) is larger than the distance (distance d1) between the first protrusions 88A and 88B, they are not engaged, and as shown in FIGS. 8A and 9, the end portions of the second protrusions 90A and 90B The movement is restricted by contacting the mating surface 102 adjacent to the first recesses 104A and 104B.

  On the other hand, as shown in FIG. 8B, on the second recesses 106A, 106B side, the interval between the first projections 88A, 88B is smaller than the interval between the second projections 90A, 90B. , 88B will enter between the second recesses 106A, 106B. Here, since the stator 32 is prevented from approaching the motor housing 20 by the contact between the end portions of the second convex portions 90A and 90B and the mating surface 102, the end portions of the first convex portions 88A and 88B are The entry between the recesses 106A and 106B is stopped.

  As a result, the stator 32 does not further approach the motor housing 20, the mating surface 102 and the mating surface 70 do not contact, and components on the motor housing 20 side such as the male terminal 56 contact the circuit board 52 of the stator 32. Thus, the electronic parts can be prevented from being damaged. Further, since each component is not damaged by incorrect assembly, the stator 32 and the motor housing 20 can be separated and reassembled.

  8C, the position of the male terminal 56 is offset from the center of the motor housing 20 by a distance d3 in the radial direction, and the position of the female terminal 54 is a distance d3 from the center of the stator 32 in the radial direction. Therefore, the male terminal 56 and the female terminal 54 are arranged at two different points on the circumference around the center position (center line M) of the motor housing 20 and the stator 32.

  Here, as a comparative example, when the male terminal 56 and the female terminal 54 are both located on the center line M, even if the stator 32 is rotated, the positions of the male terminal 56 and the female terminal 54 are the central positions. Since there is no change, the male terminal 56 and the female terminal 54 may come into contact with each other at a halfway angle and may be damaged.

  On the other hand, in the motor housing 20 and the stator 32 of the present invention, the male terminal 56 and the female terminal 54 are arranged at two different points on the circumference around the center position (center line M) of the motor housing 20 and the stator 32. Therefore, it is possible to prevent the male terminal 56 and the female terminal 54 from contacting the halfway end.

  Further, in the motor structure 10 of the present embodiment, when the motor housing 20 and the stator 32 are incorrectly assembled, the caulking portion 92A (see FIG. 4) is positioned at the position of the recess 108A (see FIG. 4) of the motor housing 20 (see FIG. 4). ) Is not arranged, and the caulking portion 92A cannot be caulked, so that it can be determined that the worker is in an improperly assembled state. Furthermore, since the engagement state of the first concave portions 104A and 104B, the first convex portions 88A and 88B, the second concave portions 106A and 106B, and the second convex portions 90A and 90B can be visually recognized from the outside during erroneous assembly, The state is easy to distinguish.

  Next, 2nd Embodiment of the motor structure of this invention is described based on drawing. Note that components that are basically the same as those in the first embodiment described above are given the same reference numerals as those in the first embodiment, and descriptions thereof are omitted.

  11 and 12, in the motor structure 10 of the first embodiment described above, caulking portions 124A and 125B and engagement concave portions 129 and 133 are provided in place of the caulking portions 92A and 92B and the concave portions 108A and 108B. A motor structure 120 as a second embodiment is shown. The motor structure 120 includes a stator 130 and a motor housing 140.

  FIG. 11A shows the stator 130 with the control circuit removed. The stator 130 has a cylindrical yoke 132 as a housing, and the above-described armature 59 (see FIG. 1) is accommodated in the yoke 132. The yoke 132 has a mating surface 134 at the peripheral edge of the opening on the motor housing 140 side, and a pair of opposed first notches cut into a substantially rectangular shape from the mating surface 134 to the opposite side of the motor housing 140. A portion 136 and a second cut portion 138 are formed.

  Further, on the side near the first notch 136 on the circumference of the mating surface 134, a third notch 142 having the same width and cut in a substantially rectangular shape from the mating surface 134 to the opposite side of the motor housing 140. And the 4th notch part 144 is formed.

  Here, the peripheral wall portion of the yoke 132 is divided by the four cut portions of the first cut portion 136 to the fourth cut portion 144, and the first side wall 146 and the second side wall 148 sandwiching the first cut portion 136, A third side wall 150 and a fourth side wall 152 sandwiching the second cut portion 138 are formed.

  The first side wall 146 and the second side wall 148 respectively have first substantially convex portions 154A and 154B having a substantially rectangular shape from the mating surface 134 on the first cut portion 136 side toward the motor housing 140 side (upward in the drawing). Projected. The first convex portions 154A and 154B are spaced apart by a distance d4 in the circumferential direction of the mating surfaces 134.

  Further, from the mating surface 134 of the third side wall 150 on the second notch 138 side and the mating surface 134 of the fourth side wall 152 on the second notch 138 side, respectively, toward the motor housing 140 side, Substantially rectangular second convex portions 155A and 155B are projected. The second convex portions 155A and 155B are spaced apart by a distance d5 in the circumferential direction of the mating surfaces 134. Here, distance d5> distance d4 is set.

  On the side close to the third cutout 142 of the third side wall 150 and the side close to the fourth cutout 144 of the fourth side wall 152, caulking portions 124 and 125 are formed as retaining portions, respectively. .

  The caulking portion 124 leaves two peripheral portions 123A and 122B in the circumferential direction from both circumferential ends of the peripheral wall portion 123, leaving a peripheral wall portion 123 facing a wall portion 160 (see FIG. 11B) described later. It has a protruding configuration. Similarly, the caulking portion 125 has a configuration in which two convex portions 126A and 126B are provided to protrude in the circumferential direction from both circumferential ends of the circumferential wall portion 127, leaving the circumferential wall portion 127 facing the wall portion 160. It has become.

  On the other hand, FIG. 11B shows the motor housing 140 with the stator 130 removed. The motor housing 140 has four engaging pieces 158 erected on the outer periphery of the disk-shaped bottom portion 156 at equal intervals in the circumferential direction and configured to be elastically deformable in the radial direction. Further, when the stator 130 and the motor housing 140 are assembled to the inner side (center side) of the engagement piece 158 of the bottom portion 156, the first side wall 146, the second side wall 148, the third side wall 150, the first side of the stator 130 are assembled. A wall portion 160 is erected on which the four side walls 152 are extrapolated.

  The wall portion 160 is a C-shaped wall body in which a U-shaped opening 161 is formed on the connector 58 side. In addition, the wall 160 has an engagement recess 129 and an engagement recess 133 formed at positions opposed to each other in the radial direction except for the region of the opening 161.

  The engaging recess 129 is composed of two recesses 128A and 128B spaced apart in the circumferential direction leaving a part of the wall 160 in between. Similarly, the engaging recess 133 is composed of two recesses 131 </ b> A and 131 </ b> B that are spaced apart in the circumferential direction while leaving a part of the wall 160 in between.

  Here, the engagement recess 129 and the engagement recess 133 are located at positions (prevention positions) respectively facing the caulking portions 124 and 125 when the stator 130 (see FIG. 11A) is assembled at the regular assembly position. Is provided. Further, the recesses 128A, 128B, 131A, and 131B are sized so that the protrusions 122A, 122B, 126A, and 126B of the caulking portions 124 and 125 can engage with each other.

  On the other hand, an annular groove 162 having a predetermined width is formed between the four engagement pieces 158 of the motor housing 140 and the wall 160. The lower end of the aforementioned pump body 18 (see FIG. 2) is placed in the groove 162. Furthermore, the outer peripheral surface of the wall 160 is provided with a mating surface 164 that is formed with a step that protrudes radially outward at the same height, and that is aligned with the mating surface 134 of the yoke 132 described above.

  Here, in the wall 160, when the stator 130 is assembled to the motor housing 140, the first notch 136 (see FIG. 11A) is disposed at the position where the first notch 136 is disposed to protrude in the radial direction. A central wall 166 is formed in which the notch 136 is extrapolated. Further, on the outer side in the circumferential direction of the central wall portion 166, concave portions 168A and 168B recessed in a substantially rectangular shape from the mating surface 164 to the bottom portion 156 side are formed. Similarly, recessed portions 168 </ b> C and 168 </ b> D that are recessed in a substantially rectangular shape from the mating surface 164 to the bottom 156 side are formed at positions where the end portion of the mating surface 164 sandwiches the opening 161. The recesses 168A, 168B, 168C, 168D are sized such that the first protrusions 154A, 154B and the second protrusions 155A, 155B can be engaged with each other.

  On the other hand, at the bottom 156 of the motor housing 140, the above-described male terminal 56 (not shown here) is provided inside the wall 160. Further, on the opposite side of the center of the bottom portion 156 from the male terminal 56, a breathing portion 66 for suppressing a pressure difference caused by the difference between the outside air temperature and the internal temperature of the motor housing 140 is provided.

  Next, the operation of the second embodiment of the present invention will be described.

  In the assembly of the stator 130 and the motor housing 140 shown in FIGS. 11A and 11B, for example, when an operator mistakenly rotates the stator 130 180 degrees and tries to assemble it to the motor housing 140. Since the interval (distance d5) between the second convex portions 155A and 155B is larger than the interval (distance d4) between the first convex portions 154A and 154B, these do not engage with the concave portions 168A to 168D, and the second convex portions 155A, The end portion of 155B is brought into contact with the mating surface 164 and movement is restricted.

  As a result, the stator 130 does not approach the motor housing 140 further, the mating surface 164 and the mated surface 134 do not contact, and the parts on the motor housing 140 side such as the male terminal 56 contact the circuit board or the like of the stator 130. Thus, the electronic parts can be prevented from being damaged. Further, since each component is not damaged by incorrect assembly, the stator 130 and the motor housing 140 can be separated and reassembled.

  On the other hand, when the stator 130 and the motor housing 140 are assembled at the regular assembly position, the concave portion 168A and the first convex portion 154B engage with the concave portion 168B and the first convex portion 154A, respectively. At the same time, the concave portion 168C and the second convex portion 155B engage with the concave portion 168D and the second convex portion 155A, respectively. As a result, the mating surface 164 of the motor housing 140 and the mating surface 134 of the stator 130 come into contact with each other, and the stator 130 is supported by the motor housing 140.

  As shown in FIGS. 12A and 12B, at the regular assembly position of the stator 130 and the motor housing 140, the convex portion 126A is formed in the concave portion 128A, the convex portion 126B is formed in the concave portion 128B, the convex portion 122A is formed in the concave portion 131A, and the concave portion 131B. Convex portions 122B are respectively arranged on the two. Here, the stator 130 is fixed to the motor housing 140 by crimping the convex portions 122A, 122B, 126A, 126B. The above-described pump body 18 (see FIG. 2) is extrapolated and assembled to the assembled state, and the assembly of the fluid pump device is completed.

  Here, FIG. 13A shows a motor structure 200 which is a comparative example with the motor structure 120 of the second embodiment of the present invention. The motor structure 200 includes a stator 202 and a motor housing 204. A first recess 206 and a second recess 208 are opposed to the wall portions 205A and 205B standing from the bottom surface of the motor housing 204 in the radial direction. Is formed. The stator 202 is formed with convex portions 210A and 210B at positions where the first concave portion 206 can be engaged, and convex portions 212A and 212B are formed at positions where the stator 202 can be engaged with the second concave portion 208.

  In the motor structure 200, for example, focusing on the right side surface, when the two convex portions 210A and 210B are bent by caulking and engaged with the first concave portion 206, the portion where the convex portions 210A and 210B are bent is obtained. The peripheral wall of the stator 202 disappears continuously with a width (= Δd1) corresponding to two of the convex portion 210A and the convex portion 210B. For this reason, the stator 202 and the motor housing 204 are not in contact with each other at this portion, and the contact area between the stator 202 and the motor housing 204 is reduced. Further, since the region where the stator 202 and the motor housing 204 are in continuous contact and the region where they are not in contact are unevenly distributed in the circumferential direction, the arrangement balance of the contact region (or non-contact region) between the stator 202 and the motor housing 204 Becomes worse. For these reasons, the backlash when assembling the stator 202 to the motor housing 204 is increased.

  On the other hand, as shown in FIG. 13B, according to the motor structure 120 of the second embodiment of the present invention, for example, when attention is paid to the side surface of the right half, two concave portions 131A and 131B and two convex portions 122A. , 122B is engaged, the peripheral wall at the location where each convex portion 122A, 122B is bent disappears with one width (= Δd2) of the convex portion 122A or convex portion 122B. For this reason, the maximum width of the opening formed in the peripheral wall of the stator 130 is a width Δd2 corresponding to one of the convex portion 122A or the convex portion 122B.

  Assuming that the protruding length of the convex portion for caulking is the same Δd2 in the motor structure 120 and the motor structure 200, Δd1 = 2 × Δd2, and thus Δd1> Δd2, and after caulking on the peripheral wall of the stator 130 The continuously remaining region is larger in the motor structure 120 of the present embodiment than in the motor structure 200 of the comparative example. Thus, in the motor structure 120 of the present embodiment, the contact area between the stator 130 and the motor housing 140 can be increased in the circumferential direction. Furthermore, since the concave portions 131A and 131B and the convex portions 122A and 122B are formed at two locations in the circumferential direction, compared with the motor structure 200 of the comparative example, the region where the stator 130 and the motor housing 140 are in continuous contact with each other is continuous. Thus, the non-contact area is less likely to be unevenly distributed in the circumferential direction, and the arrangement balance of the contact area (or non-contact area) between the stator 130 and the motor housing 140 is improved. For these reasons, rattling at the time of assembly can be suppressed as compared with the motor structure 200 of the comparative example.

  In addition, this invention is not limited to said embodiment.

  A fluid pump device P2 as shown in FIG. 10 may be used. In the fluid pump device P2, the same reference numerals are used for the same configuration as the fluid pump device P1 for convenience.

  The fluid pump device P2 uses a stator 110 instead of the stator 32 in contrast to the fluid pump device P1 according to the first embodiment of the present invention. In the stator 110, first convex portions 114A and 114B having a distance d1 are formed on the inner wall surface of the cylindrical yoke 112, and a distance d2 is provided on the inner wall surface opposite to the first convex portions 114A and 114B. The second convex portions 116A and 116B are formed.

  Thus, even when each engaging portion is provided inside the yoke 112, when the stator 110 is assembled incorrectly, the second convex portions 116A and 116B do not engage with the first concave portions 104A and 104B. Therefore, damage to the circuit board or the like in the stator 110 can be prevented.

  Further, in the fluid pump device P1, the first convex portions 88A and 88B, the first concave portions 104A and 104B, the second convex portions 90A and 90B, and the second concave portions 106A and 106B are each singular, but three or more A plurality may be provided. Further, the first convex portions 88A and 88B and the second convex portions 90A and 90B may be disposed so as to contact the mating surface 102 together.

  The shape of the first protrusions 88A and 88B, the first recesses 104A and 104B, the second protrusions 90A and 90B, and the second recesses 106A and 106B is not limited to a substantially rectangular shape, It may be a shape. Further, the caulking portions 92A (92B), 124, 125, the recesses 108A (108B), and the engagement recesses 129, 133 may be either one place or a plurality of places.

It is side surface sectional drawing which shows the whole structure of the fluid pump apparatus which concerns on 1st Embodiment of this invention. 1 is an exploded perspective view of a motor structure according to a first embodiment of the present invention. (A) It is a perspective view of the stator which concerns on 1st Embodiment of this invention. (B) It is a perspective view of the motor housing which concerns on 1st Embodiment of this invention. 1 is an exploded perspective view of a motor structure according to a first embodiment of the present invention. (A)-(c) It is the front view, rear view, and sectional drawing which show the normal assembly state of the motor housing and stator which concern on 1st Embodiment of this invention. It is a fragmentary sectional view of the caulking part concerning a 1st embodiment of the present invention. It is an exploded perspective view in the incorrect assembly state of the motor structure concerning a 1st embodiment of the present invention. (A)-(c) It is the front view, rear view, and sectional drawing which show the incorrect assembly | attachment state of the motor housing and stator which concern on 1st Embodiment of this invention. It is the elements on larger scale around the 1st crevice in the incorrect assembly state of the motor housing and stator concerning a 1st embodiment of the present invention. It is a perspective view which shows the structure of the other Example of the fluid pump apparatus which concerns on 1st Embodiment of this invention. (A) It is a perspective view of the stator which concerns on 2nd Embodiment of this invention. (B) It is a perspective view of the motor housing which concerns on 2nd Embodiment of this invention. (A) It is a side view of the motor structure based on 2nd Embodiment of this invention. (B) It is sectional drawing (A-A ') which cut the motor structure based on 2nd Embodiment of this invention by A-A'. (A) It is sectional drawing of the motor structure of the comparative example with this invention. (B) It is sectional drawing of the motor structure which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Motor structure, 20 ... Motor housing (housing), 32 ... Stator, 34 ... Rotor, 52 ... Circuit board, 54 ... Female terminal (connection part), 56 ... Male terminal (feeding part), 70 ... Mating surface, 88A, 88B ... 1st convex part (1st to-be-engaged part), 90A, 90B ... 2nd convex part (2nd to-be-engaged part), 92A ... Caulking part (prevention part), 102 ... Mating surface, 104A , 104B... First recess (first engagement portion), 106A, 106B... Second recess (second engagement portion), 108A... Recess (to-be-removed portion), 122A .. projection (projection), 122B. Convex part (convex part), 123 ... peripheral wall part (peripheral wall part), 124 ... caulking part (preventing part), 125 ... caulking part (preventing part), 126A ... convex part (convex part), 126B ... convex part ( (Convex part), 127 ... peripheral wall part (peripheral wall part), 128A ... concave part (concave part), 128B ... concave part ( Part), 129... Engaging recess (removed part), 131 A. Recessed part (recessed part), 131 B... Recessed part (recessed part), 133 ... engaging recessed part (removed part), 160. P1 ... Fluid pump device

Claims (6)

A cylindrical housing provided with a power feeding portion fed from a power source and having end portions as mating surfaces;
A connection portion connected to the power supply portion, and a circuit board to which power is supplied through the power supply portion and the connection portion are provided, and a rotating magnetic field is generated by power supply to rotate the rotor, and an end portion is A cylindrical stator as a mating surface to be mated with the mating surface;
A first engagement portion formed in the housing;
A first engaged portion that is formed on the stator and engages with the first engaging portion at a regular assembly position of the housing and the stator;
A second engagement portion formed at a position different from the first engagement portion of the housing;
A second engaged portion that is formed on the stator and engages the second engaging portion at a regular assembly position of the housing and the stator;
Have
When the first engaging portion and the first engaged portion, and the second engaging portion and the second engaged portion are engaged, the mating surface and the mating surface abut,
The motor structure in which the first engaging portion and the second engaged portion, and the second engaging portion and the first engaged portion are not engaged. The first engagement portion is composed of a pair of first recesses spaced apart by a distance d1 in the circumferential direction of the mating surface of the housing,
The first engaged portion is composed of a pair of first convex portions spaced apart by a distance d1 in the circumferential direction of the mating surfaces of the stator,
The second engagement portion is composed of a pair of second recesses spaced apart by a distance d2 in the circumferential direction of the mating surface of the housing,
2. The motor structure according to claim 1, wherein the second engaged portion includes a pair of second convex portions that are spaced apart by a distance d <b> 2 in the circumferential direction of the mating surfaces of the stator. The position of the power feeding part is offset in the radial direction from the center position of the housing,
The motor structure according to claim 1, wherein a position of the connection portion connected to the power feeding portion is offset in a radial direction from a center position of the stator.   The first engagement portion, the first engaged portion, the second engagement portion, and the second engaged portion are exposed to the outside of the housing and the stator. 4. The motor structure according to any one of 3 above.   When the first engaging portion and the first engaged portion, and the second engaging portion and the second engaged portion are engaged at a normal assembly position, the position is at the retaining position. The motor structure according to any one of claims 1 to 4, wherein a retaining portion and a retaining portion to be engaged are provided in the housing and the stator. The to-be-retained portion is composed of two recessed portions formed apart from each other in the circumferential direction leaving a wall portion in between,
The said retaining part consists of two convex parts which respectively protrude from the circumferential direction both ends of the said peripheral wall part, leaving the peripheral wall part which opposes the said wall part, and are respectively engaged with the said 2 recessed part. The motor structure described.

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