JP4730256B2 - Motor bearing holding structure - Google Patents

Description

  The present invention relates to a bearing holding structure for a motor.

The motor includes a bearing that rotatably supports an output shaft of the rotor, and the bearing is held by a bearing holding portion disposed in the case.
By the way, a motor in which the bearing holding portion is made of resin or a motor that requires a clearance between the bearing and the bearing holding portion for the convenience of assembly cannot press-fit the bearing into the bearing holding portion. For this reason, the bearing may not be sufficiently fixed to the bearing holding portion. Therefore, the outer ring may idle with respect to the bearing holding part as the inner ring rotates, and the bearing holding part and the bearing may be worn.

Conventionally, in order to suppress idling of the outer ring with respect to the bearing holding portion, an annular member provided with a plurality of first coupling portions that face the outer ring end surface of the bearing and protrude toward the bearing side, and a first annular member on the end surface There is a motor having a bearing provided with an outer ring in which a second connecting portion connected to the connecting portion is formed (see Patent Document 1). The annular member is pressed against the bearing holding portion by the elastic portion. Therefore, rotation of the annular member with respect to the bearing holding portion is restricted, and idling of the outer ring with respect to the bearing holding portion is prevented.
Japanese Utility Model Publication No. 6-62765

  However, when the second connecting portions scattered in the circumferential direction on the end surface of the cylindrical object such as the outer ring of the bearing are formed by, for example, cutting, the cylindrical object is supported at every predetermined angle. There must be. This complicates the processing for the bearing and increases the time and manufacturing cost required for processing.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bearing holding structure for a motor that can be manufactured at low cost while preventing idling of the bearing.

In order to solve the above-described problem, the invention according to claim 1 is a bearing holding structure for a motor that drives a driven part, wherein the motor includes a case and an output shaft extending in the case, and the driven The portion includes a housing and a movable body housed in the housing and driven by the output shaft, and the output shaft is rotatably supported by a bearing having an inner ring and an outer ring, and the outer peripheral surface of the outer ring The annular member is attached so as not to rotate relative to the outer ring, and the annular member is configured to engage with at least one of the case and the housing in the circumferential direction, and the outer peripheral surface of the outer ring is The annular member is a C-ring disposed in the groove, and the C-ring is formed by shifting both end portions in the axial direction, and the elastic force of the C-ring. Against The serial case and the housing sandwiching the C-ring in the axial direction.

According to a second aspect of the present invention, in the bearing holding structure of the motor that drives the driven portion, the motor includes a case and an output shaft extending in the case, and the driven portion includes a housing and A movable body housed in the housing and driven by the output shaft, the output shaft being rotatably supported by a bearing having an inner ring and an outer ring, and an annular member on the outer peripheral surface of the outer ring Is attached so that it cannot rotate relative to the outer ring, and the annular member is configured to engage with at least one of the case and the housing in the circumferential direction, and the outer circumferential surface of the outer ring extends in the circumferential direction. has a groove, said annular member, I C-ring der disposed in said groove, said C-ring is formed by shifting the both end portions in the axial direction, at least one of the case and the housing Pressurized Ru.

According to a third aspect of the present invention, there is provided the motor bearing holding structure according to the second aspect, further comprising a biasing member that biases the output shaft in the axial direction.
According to a fourth aspect of the present invention, in the motor bearing holding structure according to any one of the first to third aspects, at least one of the case and the housing is an opening of the C-ring in the circumferential direction. It has a convex part arranged between.

Also, an invention according to claim 5, in the bearing holding structure of a motor according to any one of claims 1-4, wherein the output shaft includes an eccentric portion having a center of gravity and the center of rotation is different cross-sectional Prepare.

The invention according to claim 6 is the motor bearing holding structure according to any one of claims 1 to 5 , wherein the case has a bearing holding portion made of a resin, and the bearing holding portion is The outer ring of the bearing is held.

The invention according to claim 7 is the motor bearing holding structure according to any one of claims 1 to 6 , wherein the driven portion is a pump, and the bearing and the movable body are It is arranged in one continuous space formed by the housing.

The invention according to claim 8 is the bearing holding structure for a motor according to any one of claims 1 to 7 , wherein the case has a brush holder for holding the brush of the motor, and the bearing The brush is disposed in one continuous space formed between the brush holder and the housing.

(Function)
According to the first and second aspects of the present invention, since the annular member engages with at least one of the case and the housing, the rotation of the annular member with respect to the case and the housing is restricted, and the annular member cannot be relatively rotated. The idling of the outer ring attached to the case with respect to the case and the housing can be suppressed. Thus, idling of the bearing can be suppressed without processing the end face of the bearing.

Also , the C ring can be easily attached to the outer ring so as not to rotate relative to the elasticity of the C ring .

Further, according to the invention described in claim 1, by C rings formed by shifting the both end portions in the axial direction are sandwiched by the casing and the housing, the ends of the C-ring axially offset cases And at least one of the housing and the C-ring and at least one of the case and the housing are engaged in the circumferential direction. Therefore, rotation with respect to the case or housing of C ring as an annular member can be controlled.

Further, according to the invention described in claim 2, by C rings formed by shifting the both end portions in the axial direction is pressed in at least one of the case and the housing, the ends of the C-ring axially offset Bites into at least one of the bearing holding portion and the driven portion, and the C-ring and at least one of the case and the housing engage in the circumferential direction. Therefore, rotation with respect to the case or housing of C ring as an annular member can be controlled.

According to the invention described in claim 3 , since the output shaft is urged by the urging member, the C-ring is strongly pressed by the case or the housing. Therefore, the rotation of the C ring as the annular member with respect to the case or the housing can be more reliably regulated.
According to the fourth aspect of the present invention, the convex portion disposed between the openings of the C ring and the end of the C ring abut, and the C ring and at least one of the case and the housing are engaged in the circumferential direction. Match. Therefore, the rotation of the C ring with respect to the case and the housing can be restricted. Moreover, since the convex portion is disposed between the openings of the C ring, the rotation of the C ring as the annular member with respect to the case and the housing can be restricted regardless of the rotation direction of the output shaft.

In the invention according to claim 5 , the output shaft has an eccentric portion. When the output shaft having the eccentric portion rotates as described above, a large radial load acts on the output shaft and the bearing that supports the output shaft, and the bearing may run idle. However, as described above, since the annular member attached to the outer ring of the bearing so as not to be relatively rotatable is engaged with at least one of the case and the housing in the circumferential direction, idling of the bearing can be suppressed.

The invention described in claim 6 has a bearing holding portion made of resin. In this way, sufficient fixing strength cannot be obtained simply by press-fitting the bearing into the bearing holding portion made of resin, and therefore the bearing may run idle as the output shaft rotates. However, as described above, since the annular member attached to the outer ring of the bearing so as not to be relatively rotatable is engaged with at least one of the case and the housing in the circumferential direction, idling of the bearing can be suppressed.

In the seventh aspect of the present invention, the bearing and the movable body are arranged in one continuous space formed by the housing. If the outer ring is idle, the smooth movement of the movable body may be hindered by the abrasion powder generated due to the idle rotation. However, since the outer ring is prevented from idling by the above-described configuration, no abrasion powder is generated, and the smooth movement of the movable body is not hindered.

In the invention according to claim 8 , the bearing and the brush are arranged in one continuous space formed between the brush holder and the housing. If the outer ring idles, the smooth movement of the brush may be hindered by abrasion powder generated due to the idling. However, since the outer ring is prevented from idling by the above-described configuration, no abrasion powder is generated, and the smooth movement of the brush is not hindered.

  ADVANTAGE OF THE INVENTION According to this invention, the bearing holding structure of the motor which can suppress the idling of a bearing and can be manufactured cheaply can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view of a pump device driven by a DC motor (hereinafter referred to as motor 1) having a motor bearing holding structure according to an embodiment of the present invention.

  As shown in FIG. 1, the pump device includes a motor 1 that is a driving unit and a pump unit 2 that is a driven unit that pumps fluid by rotation of the motor 1. In the following description, the right side is the output side and the left side is the non-output side in the state shown in FIG.

  The motor 1 includes a yoke housing 3 formed in a substantially bottomed cylindrical shape that opens to the output side, an end plate 4 formed in a plate shape that closes the opening of the yoke housing 3, and the yoke housing 3 and the end plate 4 And a rotor 5 disposed in a hollow portion formed by the above. The yoke housing 3 and the end plate 4 constitute a case of the motor 1.

  The yoke housing 3 is made of metal, and a plurality of magnets 6 are fixed to the inner peripheral surface 3a at equal intervals along the circumferential direction. Further, a non-output-side bearing holding portion 31 is integrally formed at the approximate center of the bottom portion 3 b of the yoke housing 3. The non-output side bearing holding portion 31 is formed in a cylindrical shape extending from the bottom portion 3 b of the yoke housing 3 to the opening direction of the yoke housing 3. Further, the yoke housing 3 is formed with a flange portion 3c extending outward from the opening side (output side) end of the yoke housing 3 in the radial direction. Bolt holes 3d and 3e are formed in the flange 3c, and the yoke housing 3 is fixed to the pump unit 2 by bolts 7a and 7b disposed in the bolt holes 3d and 3e.

  A through hole 41 is formed in the end plate 4 so as to penetrate the center in the thickness direction. The end plate 4 is made of resin, and a brush holder 42 that holds the brush 8 that is in sliding contact with the rotor 5 is formed integrally with the end plate 4. The brush holder 42 is formed on the non-output side of the end plate 4 so as to be located in the internal space of the yoke housing 3, and the brush 8 is directed radially inward so as to protrude from the brush holder 42 toward the rotor 5. It is energized.

  Further, a bearing holding portion 43 is formed on the output side of the end plate 4 (see FIGS. 2 and 3). The bearing holding portion 43 is formed in an annular shape that protrudes from the output-side surface 4 a of the end plate 4 in the plate thickness direction and is coaxial with the through hole 41. The bearing holding portion 43 is integrally formed with a convex portion 44 protruding from a part of the end surface 43a of the bearing holding portion 43 to the pump unit 2 side (output side) (see FIG. 3).

  The rotor 5 has an armature 51 formed in a substantially cylindrical shape, an output shaft 52 on which the armature 51 is fixed coaxially, and a substantially cylindrical shape, which is fixed on the output shaft 52 coaxially like the armature 51. The commutator 53 is made up of.

  The armature 51 includes a core 51a and a plurality of armature coils 51b wound around the core 51a, and is disposed to face the magnet 6 fixed to the yoke housing 3 in the radial direction.

  The output shaft 52 protrudes through the through hole 41 formed in the end plate 4 to the output side of the end plate 4. An eccentric part 52 a having a cross section with a different center of rotation and center of gravity is formed at the output side end of the output shaft 52. The eccentric portion 52a is disposed on the output side from the end plate 4, and is accommodated in an accommodating portion 22 formed in a housing (hereinafter referred to as a unit housing 21) of the pump unit 2 described later. The output shaft 52 has an output as a bearing disposed on the output side of the armature 51 and the commutator 53 on the output side of the armature 51 and the commutator 53. The side bearing 55 is fixed coaxially. The non-output side bearing 54 is fixed to the non-output side bearing holding portion 31 formed in the yoke housing 3 by, for example, press fitting. Further, the output side bearing 55 is held by the bearing holding portion 43 formed on the end plate 4 and made of resin, and is disposed on the output side of the end plate 4. Therefore, the rotor 5 is rotatably supported by the yoke housing 3 and the end plate 4, and the armature 51 rotates with respect to the magnet 6. In addition, a spring washer 32 as an urging member is disposed between the bottom 31a of the non-output side bearing holding portion 31 and the non-output side bearing 54 in the axial direction, and the output shaft 52 is supported by the spring washer 32. It is energized to the output side.

  The commutator 53 is disposed between the armature 51 and the output side bearing 55 in the axial direction of the output shaft 52. On the outer periphery of the commutator 53, a plurality of commutator pieces 53a electrically connected to the armature coil 51b are arranged at equal intervals along the circumferential direction. A plurality of brushes 8 are arranged to face the commutator 53 in the radial direction of the commutator 53, and the brush 8 and the commutator piece 53a are in sliding contact. A current is supplied to the armature coil 51b from the brush 8 through the commutator piece 53a. Therefore, the direction of the current flowing through the armature coil 51b changes as the rotor 5 rotates.

Here, the output side bearing 55 held by the bearing holding portion 43 formed on the end plate 4 will be described in detail.
As shown in FIGS. 4 and 5, the output-side bearing 55 is, for example, a ball bearing, and includes an inner ring 55a formed in a cylindrical shape that is coaxial with the output shaft 52, and an inner ring 55a that is coaxial with the inner ring 55a. And an outer ring 55b formed in a cylindrical shape. The output shaft 52 is fixed to the inner peripheral surface 56a of the inner ring 55a (see FIG. 1), and balls 55c are disposed on the outer peripheral surface 56b of the inner ring 55a. That is, a plurality of balls 55c are disposed between the inner ring 55a and the outer ring 55b. Therefore, the inner ring 55a can rotate with respect to the outer ring 55b, and the output shaft 52 fixed to the inner ring 55a is supported rotatably with respect to the bearing holding portion 43 formed on the end plate 4 (see FIG. 1). A pair of shields 55e are fixed to the inner periphery of the outer ring 55b of the output side bearing 55 of the present embodiment so as to sandwich the ball 55c, but the configuration of the output side bearing 55 is not limited to this, and the inner ring 55a The outer ring 55b can be appropriately changed.

Further, a groove 55d is formed in the outer circumferential surface 57 of the outer ring 55b along the circumferential direction, and the C ring 9 is disposed along the groove 55d.
The C ring 9 is a plate-like annular member having the axial direction of the output shaft 52 as the plate thickness direction, and is fixed to the outer ring 55 b so as not to be relatively rotatable by the elasticity of the C ring 9. The C-ring 9 has a first end 91 and a second end 92, and the first end 91 and the second end 92 are opposed to each other, and a gap exists between them. Further, the C ring 9 has an outer diameter D2 larger than the outer diameter D1 of the outer ring 55b, and the radially outer portion of the C ring 9 protrudes radially outward from the outer ring 55b (see FIG. 4). ). The outer ring 55b is held in the axial direction on the opposite side of the groove 55d in the axial direction by the bearing holding portion 43 from the radial direction, and the convex portion 44 formed to protrude from the end surface 43a of the bearing holding portion 43 in the axial direction is the C ring 9. Between the openings (between the first end 91 and the second end 92) (see FIGS. 1, 2, 3 and 5).

As shown in FIG. 1, the pump unit 2 includes a unit housing 21 having the housing portion 22 described above.
The unit housing 21 has an accommodating portion 22 that opens toward the motor 1 and is recessed along the protruding direction of the output shaft 52, and a plunger sliding portion 23 that extends along the radial direction of the output shaft 52. Yes.

  In the unit housing 21, a fitting portion 22 a that is recessed according to the shape of the bearing holding portion 43 and fitted into the bearing holding portion 43 is formed at the opening side (opposite output side) end portion of the housing portion 22. . Further, a concave portion 22b that is further recessed according to the C-ring 9 fixed to the bearing holding portion 43 is formed at the approximate center of the fitting portion 22a. The bottom surface 22c of the recess 22b is formed so as to contact the C-ring 9 from the axial output side, and the output side bearing 55 is restricted from moving toward the output side by the bottom surface 22c. Therefore, the output side bearing 55 is positioned in the axial direction. The output-side bearing 55 abuts on the opening-side (counter-output-side) surface 22d of the housing portion 22, and the movement of the output-side bearing 55 in the radial direction is restricted by the opening-side surface 22d. In other words, the output side bearing 55 is held by the bearing holding portion 43 of the end plate 4 and the surface 22 d of the housing portion 22 formed in the unit housing 21.

  The plunger sliding portion 23 is formed continuously from the accommodating portion 22 and communicates with a pump chamber (not shown). On the side of the accommodating portion 22 of the plunger sliding portion 23, a plunger 24 as a movable body that comes into contact with a bearing 52c fixed to the eccentric portion 52a of the output shaft 52 is slidably disposed. The plunger 24 reciprocates along the plunger sliding portion 23 as the output shaft 52 rotates, and the fluid in the pump chamber is pressurized and discharged to the outside as the plunger 24 reciprocates.

As described above, the present embodiment has the following effects.
(1) Since the C ring 9 attached to the outer ring 55b so as not to rotate relative to the outer ring 55b is engaged with the bearing holding portion 43 (convex portion 44) of the end plate 4 in the circumferential direction. , And the idling of the outer ring 55b with the C ring 9 attached so as not to rotate relative to the bearing holding portion 43 can be suppressed. Accordingly, idling of the outer ring 55b in the bearing holding portion 43 can be suppressed without processing the end face of the bearing (output-side bearing) 55.

  (2) The C ring 9 as an annular member can be easily attached to the outer ring 55b so as not to rotate relative to the elasticity of the C ring 9. Further, since the C ring 9 is a widely used member, a significant increase in manufacturing cost is hindered.

  (3) A convex portion in which an end portion (first end portion or second end portion 92) of the C ring 9 is disposed between openings of the C ring 9 (between the first end portion and the second end portion 92). 44, the C ring 9 and the end plate 4 are engaged in the circumferential direction. Therefore, the rotation of the C ring 9 with respect to the end plate 4 can be restricted. Further, since the convex portion 44 is disposed between the openings of the C-ring 9 (between the first end portion 91 and the second end portion 92), the convex portion rotates the output shaft 52 in either the forward or reverse direction. However, it contacts the end of the C-ring 9 from the circumferential direction. Therefore, the C ring 9 can be engaged with the end plate 4 (convex portion 44) regardless of the rotation direction of the output shaft 52, and the rotation of the C ring 9 with respect to the end plate 4 can be restricted by the engagement.

  (4) In the present embodiment, the output shaft 52 includes the eccentric portion 52a. When the output shaft 52 having the eccentric portion 52a rotates in this way, a large radial load acts on the output shaft 52 and the bearing (the output side bearing 55) that supports the output shaft 52, and the output side bearing 55 There is a risk of idling with respect to the bearing holding portion 43. However, as described above, the annular member (C-ring 9) attached to the outer ring 55b of the output-side bearing 55 so as not to rotate relatively engages with the convex portion 44 in the circumferential direction, and therefore the bearing (output-side bearing 55). Idling can be suppressed.

  (5) In the present embodiment, the output side bearing 55 is held by the bearing holding portion 43 made of resin. Thus, since sufficient fixing strength cannot be obtained simply by press-fitting a bearing (output-side bearing 55) into the bearing holding portion 43 made of resin, the bearing (output-side bearing 55) is provided as the output shaft 52 rotates. There is a risk of slipping. However, as described above, the annular member (C-ring 9) attached to the outer ring 55b of the output-side bearing 55 so as not to rotate relatively engages with the convex portion 44 in the circumferential direction, and therefore the bearing (output-side bearing 55). Idling can be suppressed. Further, since the end plate 4 having the bearing holding portion 43 is made of resin, the convex portion 44 can be easily formed.

  (6) For assembling the pump device, first, the rotor 5 is accommodated in the yoke housing 3, and the end plate 4 is attached to the yoke housing 3. Next, the output side bearing 55 to which the C ring 9 is attached is connected to the output shaft so that the convex portion 44 of the end plate 4 is disposed between the first end portion 101 and the second end portion 102 of the C ring 9. Assemble to 52. At this time, the C-ring 9 can be easily assembled to the groove 55d by a spring action and is held in the groove 55d. Therefore, the output side bearing 55 and the C ring 9 can be handled as a unit. Subsequently, the bearing 52 c is assembled to the eccentric portion 52 a of the output shaft 52. Thereby, the motor 1 as a subassembly is completed. On the other hand, a plunger 24 is assembled to the unit housing 21 together with a spring through the accommodating portion 22. Then, the motor 1 (subassembly) is assembled to the unit housing 21. As a result, the C ring 9 is fitted in the groove 55d of the outer ring 55b, and the convex portion 44 of the end plate 4 is located between both ends (the first end 101 and the second end 102) of the C ring 9. It can be easily assembled to the proper positional relationship.

  (7) In the present embodiment, the output side bearing 55 and the plunger 24 are arranged in one continuous space (accommodating portion 22) formed by the unit housing 21. If the outer ring 55b idles, wear powder generated due to the idle rotation may enter the plunger sliding portion 23, and the wear powder may hinder smooth movement of the plunger 24. However, since the idling of the outer ring 55b is suppressed by the above-described configuration, wear powder is not generated and the smooth movement of the plunger 24 is not hindered.

  (8) In the present embodiment, the bearing holding portion 43 and the brush holder 42 are integrally formed on the end plate 4, and the output side bearing 55 and the brush 8 are arranged in one continuous space. If the outer ring 55b slips, the wear powder generated due to the slipping enters between the commutator 53 and the brush 8 or enters the brush holder 42, and the wear powder causes the smoothness of the brush 8. Movement may be hindered. However, since the idling of the outer ring 55b is suppressed by the above-described configuration, no abrasion powder is generated and the smooth movement of the brush 8 is not hindered.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the C-ring 9 which is a widely used member is used as the annular member, and the C-ring 9 is fixed to the output-side bearing 55 by the elasticity. However, the annular member is not limited to such an aspect. May be fixed by bonding or the like, and the fixing method of the annular member can be appropriately changed as long as it cannot be rotated relative to the outer ring.

  In the above embodiment, the convex portion 44 disposed between the openings of the C ring 9 (between the first end portion 91 and the second end portion 92) in the circumferential direction is formed integrally with the end plate 4. However, it is not limited to such an embodiment, and may be formed in the driven part (unit housing 21).

  In the above embodiment, the C-ring 9 as an annular member is prevented from moving (rotating) in the circumferential direction by engaging the convex portion 44 in the circumferential direction, but is not limited to such a mode. For example, as shown in FIG. 6, a C-ring 100 as an annular member is formed in a spiral shape so that both end portions (first end portion 101 and second end portion 102) are displaced in the axial direction. Then, the case (end plate 104) and the unit housing 103 are fixed so that the C-ring 100 is pressed against the unit housing (driven portion) 103. According to such a configuration, the end portion (for example, the first end portion 101) of the C ring 100 bites into the surface 103a on the unit housing 103 side, so that the C ring 100 and the unit housing 103 are engaged in the circumferential direction. Therefore, the rotation of the C ring 100 is restricted, and the rotation of the outer ring 55b of the output side bearing 55 relative to the case (end plate 104) and the unit housing 103 can be suppressed. In such a configuration, a spring washer (biasing member) 32 that urges the output shaft 52 in the axial direction is disposed as in the above embodiment, and the urging force of the spring washer 32 causes the C-ring 100 to move. If it is configured to be strongly pressed by the unit housing 103, the rotation of the C-ring 100 relative to the unit housing 103 can be more reliably regulated. The C ring 100 may be urged toward the end plate 104 and pressed against the surface 104a on the end plate 104 side.

  Further, as shown in FIG. 7, the C-ring 200 is formed in a spiral shape so that both end portions (first end portion 201 and second end portion 202) are displaced in the axial direction. Then, the case (end plate 203) and the unit housing 204 are fixed so that the C ring 200 is clamped against the elastic force of the C ring 200 by the end plate 203 and the unit housing 204. According to such a configuration, both ends of the C-ring 200 (the first end 201 and the second end 202) bite into the surface 204a on the unit housing 204 side and the surface 203a on the end plate 203 side, respectively. 200, the unit housing 204 and the end plate 203 are engaged in the circumferential direction. Therefore, rotation of the C ring 200 is restricted, and idling of the outer ring 55b of the output side bearing 55 relative to the case (end plate 203) and the unit housing 204 can be suppressed.

  In the above embodiment, the C-ring 9 having an opening is used as the annular member, and both ends (the first end 91 and the second end 92) of the C-ring 9 are engaged with the end plate 4 so that C Although movement (rotation) in the circumferential direction of the ring 9 is restricted, the present invention is not limited to such a mode. For example, by forming a protruding portion that protrudes radially outward from the annular member (annular member) and forming an engaging portion that engages with the protruding portion in the end plate 4 or the unit housing 21. Further, the rotation of the annular member with respect to the end plate 4 and the unit housing 21 may be restricted, and the idling of the bearing with respect to the bearing holding portion may be suppressed.

In the above embodiment, the output shaft 52 is urged by the spring washer 32. However, the above-described effects (1) to (8) can be achieved regardless of such an aspect.
In the above embodiment, the motor 1 is described as a DC motor. However, the present invention is not limited to such a mode, and an AC motor, a brushless motor, or the like may be used and can be changed as appropriate.

The schematic sectional drawing of the pump apparatus provided with the motor which concerns on this invention. The side view of a motor. 2 is a diagram seen from the direction of arrow A. BB sectional drawing of FIG. The front view of an output side bearing. Schematic of another example of the present invention. The schematic of the other another example of this invention.

Explanation of symbols

  D1 ... Outer diameter of outer ring, D2 ... Outer diameter of annular member, 1 ... Motor, 2 ... Pump unit (driven part), 3 ... Yoke housing (case), 4,104,203 ... End plate (case), 5 ... rotor, 8 ... brush, 9, 100, 200 ... C-ring (annular member), 21, 103, 204 ... unit housing (housing), 24 ... plunger (movable body), 32 ... spring washer (biasing member), 42 ... Brush holder, 43 ... Bearing holding part, 44 ... Projection, 51 ... Armature, 51b ... Armature coil, 52 ... Output shaft, 52a ... Eccentric part, 53 ... Commutator, 55 ... Output side bearing (bearing) 55a ... inner ring, 55b ... outer ring, 55d ... groove, 57 ... outer peripheral surface of the outer ring.

Claims (8)

In the bearing holding structure of the motor that drives the driven part,
The motor includes a case and an output shaft extending through the case,
The driven portion includes a housing and a movable body that is accommodated in the housing and driven by the output shaft,
The output shaft is rotatably supported by a bearing having an inner ring and an outer ring,
An annular member is attached to the outer peripheral surface of the outer ring so as not to rotate relative to the outer ring, and the annular member is configured to engage with at least one of the case and the housing in the circumferential direction ,
The outer peripheral surface of the outer ring has a groove extending in the circumferential direction,
The annular member is a C-ring disposed in the groove,
The C-ring is formed by shifting both ends in the axial direction,
A bearing holding structure for a motor, wherein the case and the housing sandwich the C ring in the axial direction against the elastic force of the C ring . In the bearing holding structure of the motor that drives the driven part,
The motor includes a case and an output shaft extending through the case,
The driven portion includes a housing and a movable body that is accommodated in the housing and driven by the output shaft,
The output shaft is rotatably supported by a bearing having an inner ring and an outer ring,
An annular member is attached to the outer peripheral surface of the outer ring so as not to rotate relative to the outer ring, and the annular member is configured to engage with at least one of the case and the housing in the circumferential direction,
The outer peripheral surface of the outer ring has a groove extending in the circumferential direction,
Said annular member, I C-ring der disposed in said groove,
The C-ring is formed by shifting both ends in the axial direction,
Bearing holding structure of a motor, characterized in that that will be pushed to at least one of the case and the housing. The motor bearing holding structure according to claim 2 ,
A motor bearing holding structure comprising a biasing member that biases the output shaft in the axial direction. In the bearing holding structure of the motor according to any one of claims 1 to 3 ,
At least one of the case and the housing has a convex portion disposed between the opening portions of the C-ring in the circumferential direction. In the bearing holding structure of the motor according to any one of claims 1 to 4 ,
The output shaft includes an eccentric portion having a cross section in which a center of gravity and a rotation center are different from each other. In the bearing holding structure of the motor according to any one of claims 1 to 5 ,
The case has a bearing holding portion made of resin,
The bearing holding structure of the motor, wherein the bearing holding portion holds an outer ring of the bearing. The bearing holding structure for a motor according to any one of claims 1 to 6 ,
The driven part is a pump;
The bearing holding structure for a motor, wherein the bearing and the movable body are arranged in one continuous space formed by the housing. In the bearing holding structure of the motor according to any one of claims 1 to 7 ,
The case has a brush holder for holding the brush of the motor,
The bearing holding structure for a motor, wherein the bearing and the brush are arranged in one continuous space formed between the brush holder and the housing.

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