JP2013007418A - Bearing support structure and electric power steering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing support structure and electric power steering device that promptly and conveniently adjust positioning in a radial direction of rotary shaft of a motor.SOLUTION: The bearing support structure supports a bearing 45 in which the rotary shaft 40a of the motor 40 is supported in a rotatable manner. The structure includes inside an inner surface 46a on which an outer surface of the bearing 45 can abut which is inserted with an axial movement, and the structure includes: a sidewall 46A on which a through-hole 48 opening to the inner surface 46a is formed; and a C-type spring member 49 that is inserted to the through-hole 48 of the sidewall 46A from the outside of the sidewall 46A so that part of the member projects from the inner surface 46a, and pushes the bearing 45 to the inner surface 46a while the bearing is inserted to the sidewall 46A.

Description

  The present invention relates to a bearing support structure that supports a bearing that rotatably supports a rotating shaft of a motor, and an electric power steering apparatus that includes the bearing support structure.

  2. Description of the Related Art Conventionally, an electric power steering apparatus that gives an assist force for assisting a steering operation to a steering system by rotating a steering shaft using a motor as a drive source is widely known. A motor mounted on such an electric power steering apparatus is formed in a housing in which a rotating shaft is rotatably supported by a bearing and the bearing accommodates the motor, as in a motor described in Patent Document 1, for example. It is supported by a circular concave bearing support.

  Further, inside the bearing support portion, a wave washer is accommodated that presses against the end face of the bearing and biases the bearing in the axial direction of the rotating shaft of the motor. Further, the wave washer is extended with a plate-like spring member that urges the bearing in the radial direction so that the bearing (specifically, the outer ring of the bearing) is pressed against the inner peripheral surface of the bearing support portion. ing.

  When the motor is assembled, the bearing and the wave washer are externally fitted to the rotating shaft of the motor, and the portion of the rotating shaft of the motor to which the bearing and the wave washer are attached is inserted into the bearing support portion. Then, the spring member of the wave washer is disposed so as to be interposed between the outer peripheral surface of the bearing and the inner peripheral surface of the bearing support portion. Therefore, the bearing is pressed against the surface portion opposite to the spring member on the inner peripheral surface of the bearing support portion by the elastic force of the spring member of the wave washer. As a result, the rotation shaft of the motor is positioned in the radial direction of the rotation shaft of the motor in the bearing support portion. Therefore, even if an eccentric load is applied in the radial direction to the rotation shaft of the motor as the rotation shaft of the motor is rotated, the rotation of the rotation shaft of the motor is suppressed.

JP 2002-327740 A

  By the way, in the motor described above, when adjusting the radial position of the rotating shaft that is supported by receiving a pressing force from the spring member of the wave washer, first, the rotating shaft of the motor on which the bearing and the wave washer are externally fitted is used. After being extracted from the bearing support, the wave washer with the spring member is removed from the rotating shaft of the motor. Then, another wave washer extended with a spring member having a different elastic force from the removed wave washer is newly fitted on the rotation shaft of the motor, and the rotation shaft of the motor is reinserted into the bearing support section. Is done. That is, the above-described motor has a problem that complicated operations such as insertion / extraction of the rotation shaft of the motor with respect to the bearing support portion and removal / assembly of the motor housing are required when positioning and adjusting the rotation shaft of the motor in the radial direction. It was.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a bearing support structure and an electric power steering device capable of quickly and easily performing positioning adjustment in a radial direction of a rotating shaft of a motor. There is to do.

  In order to achieve the above object, a bearing support structure of the present invention is a bearing support structure that supports a bearing in which a rotating shaft of a motor is rotatably supported, and the bearing is inserted with movement in an axial direction. A bearing insertion portion on which the outer surface of the bearing insertion portion is abutted, a bearing insertion portion formed with a penetrating portion that opens to the abutting surface, and the bearing insertion portion with respect to the penetration portion of the bearing insertion portion. A gist is provided with a pressing member that is inserted so that a part thereof protrudes from the contact surface from the outside and presses the bearing in a state of being inserted into the bearing insertion portion against the contact surface. .

  According to the above configuration, the pressing member applies a pressing force to the bearing in the radial direction from the outside of the bearing insertion portion through the penetration portion. When changing the radial pressing force on the bearing, the pressing member provided outside the bearing insertion portion can be removed from the bearing insertion portion, and the removed pressing member can be applied to the bearing. Another pressing member having a different pressing force is attached to the bearing insertion portion. That is, the magnitude of the pressing force acting in the radial direction from the pressing member to the bearing is easily changed by the attaching / detaching operation of the pressing member with respect to the bearing insertion portion. Therefore, the positioning adjustment in the radial direction with respect to the rotation shaft of the motor can be performed quickly and easily.

  The gist of the bearing support structure of the present invention is that the pressing member is mounted so as to sandwich the bearing insertion portion from the outside while being elastically deformed with respect to the bearing insertion portion.

  According to the above configuration, the positioning operation in the radial direction with respect to the rotation shaft of the motor is completed by mounting the pressing member so as to sandwich the bearing from the outside of the bearing insertion portion while elastically deforming the pressing member. Therefore, radial positioning adjustment with respect to the rotating shaft of the motor can be performed more quickly and easily.

  Further, in the bearing support structure of the present invention, the pressing member has an elastic portion whose one end side is located outside the through portion and whose other end side can be pressed against the outer surface of the bearing insertion portion. The gist of the invention is that the one end side is formed with a convex portion that is inserted into the penetrating portion from the outside of the bearing insertion portion and has a tip protruding inside the bearing insertion portion.

  According to the above configuration, the elastic portion of the pressing member is inserted into the inside of the bearing insertion portion while the other end side is in pressure contact with the outer surface of the bearing insertion portion while being elastically deformed. Is done. And the convex part of an elastic part presses the bearing in the state inserted in the bearing insertion part on the contact surface of a bearing insertion part. Therefore, the positioning adjustment in the radial direction of the rotating shaft can be realized by attaching and detaching the pressing member with elastic deformation to the bearing insertion portion.

Moreover, the bearing support structure of this invention makes the summary that the said elastic part is formed in C shape.
According to the said structure, the elastic part can implement | achieve easily the structure which the other end side can press-contact with the outer surface of a bearing insertion part, while the convex part formed in the one end side is inserted from the outer side with respect to a penetration part.

Moreover, the bearing support structure of this invention makes it a summary to further provide the supporting member which supports the said rotating shaft, urging | biasing an axial direction.
When the bearing is supported in a state of being radially separated from the contact surface of the bearing insertion portion by supporting the rotation shaft of the motor while urging the rotation shaft of the motor in the axial direction, When an eccentric load is applied to the bearing, the bearing may be displaced in the radial direction. In this regard, according to the above configuration, the bearing can be positioned in the radial direction by pressing the pressing member so that the bearing is brought into close contact with the contact surface of the bearing insertion portion.

Moreover, the gist of the bearing support structure of the present invention is that the bearing insertion portion and the pressing member are provided at an end portion on at least one side of the rotating shaft.
According to the above configuration, even if an eccentric load acts on the rotation shaft of the motor in the radial direction, the pressing member provided at the end of the rotation shaft presses the bearing of the rotation shaft against the contact surface of the bearing insertion portion. By positioning in the radial direction, swinging in the radial direction of the rotating shaft can be suitably suppressed.

  In order to achieve the above object, an electric power steering apparatus according to the present invention is an electric power steering apparatus that applies power transmitted from a motor to a rack shaft as an assisting force for assisting a steering operation. The gist is that the bearing support structure having the above-described configuration is provided as a bearing support structure that supports a bearing that rotatably supports a rotating shaft of a motor.

  According to the above configuration, the same effect as that of the bearing support structure can be obtained in the electric power steering apparatus.

  ADVANTAGE OF THE INVENTION According to this invention, the positioning adjustment in the radial direction of the rotating shaft of a motor can be performed quickly and easily.

1 is a schematic configuration diagram of an electric power steering apparatus according to an embodiment of the present invention. The fragmentary sectional view of the electric motor of the same embodiment. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, in an electric power steering apparatus (Electric Power Steering, hereinafter also referred to as “EPS”) 10, a housing 12 into which a rack shaft 11 is inserted is an abbreviation that accommodates almost the entire rack shaft 11. It is formed by joining a cylindrical first housing 14 and a substantially cylindrical second housing 15 in which a part of the rack shaft 11 is accommodated. An end housing 13 for fixing the electric motor 40 as a motor to the housing 12 is formed on the outer peripheral surface of the first housing 14 on the second housing 15 side.

  In the housing 12, tie rods 17 are connected to both ends of the rack shaft 11 via rack ends 16. A known ball joint is used for the rack end 16 of the present embodiment. The tip of the tie rod 17 is connected to a knuckle (not shown) that supports the steered wheels 18.

  In the housing 12, a pinion shaft 20 constituting the proximal end side of the steering shaft 19 is rotatably supported in a state of intersecting with the rack shaft 11. The steering shaft 19 according to the present embodiment includes a pinion shaft 20, a column shaft 22 provided with a steering 21 at one end, and an intermediate shaft 23 that connects the pinion shaft 20 and the column shaft 22. The rack teeth 11 a formed on the peripheral surface of the rack shaft 11 are meshed with the pinion shaft 20.

  That is, the rack shaft 11 is connected to the steering shaft 19 via a well-known rack and pinion mechanism 24, and the rotation of the steering shaft 19 due to the operation of the steering 21 is performed by the rack and pinion mechanism 24. Converted to reciprocating motion. And the rudder angle of the steered wheel 18 is changed by the movement of the rack shaft 11 in the axial direction.

  The EPS 10 of the present embodiment is a so-called rack assist type EPS that applies assist force to the steering system by converting the rotation (power) of the electric motor 40 into reciprocation of the rack shaft 11 using the ball screw device 30. It is configured. More specifically, as a rack parallel type EPS in which the electric motor 40 is disposed with respect to the housing 12 so that the rotation shaft 40a of the electric motor 40 and the rack shaft 11 are substantially parallel to each other in the rotation center lines P1 and P2. It is configured.

  The rack shaft 11 is configured as a screw shaft by forming a screw portion 11b having a screw groove formed on the outer periphery thereof. The ball screw device 30 is formed by screwing a ball screw nut 33 to the screw portion 11b via a plurality of balls 32.

  The ball screw nut 33 is configured to be rotatable integrally with the driven pulley 34, and a drive pulley 36 that is drivingly connected via a belt 35 is arranged in parallel on the radially outer side of the driven pulley 34. . A driving pulley 36 is coupled to the rotating shaft 40 a of the electric motor 40, and a belt 35 is stretched around the driving pulley 36 and the driven pulley 34. The rotational power of the rotating shaft 40a in the electric motor 40 is transmitted to the ball screw nut 33 via the drive pulley 36, the belt 35, and the driven pulley 34, and the relative rotation of the ball screw nut 33 with respect to the rack shaft 11 is reduced to the rack shaft. 11 reciprocating motions. Therefore, the EPS 10 of the present embodiment assists the steering operation with the axial pressing force (driving force) based on the motor torque via the belt-type transmission mechanism including the driven pulley 34, the belt 35, and the driving pulley 36. Is applied to the steering system as an assisting force (auxiliary steering force).

Next, the configuration of the electric motor 40 in the EPS 10 of the present embodiment will be described.
As shown in FIG. 2, the electric motor 40 has a substantially cylindrical motor case 41 whose one end is closed. The motor case 41 is fixed to the end housing 13 with bolts 42 in a state where the opening end is in contact with the end housing 13. The space surrounded by the end housing 13 and the motor case 41 accommodates a motor body including a rotating shaft 40a of the electric motor 40 and a rotor (not shown).

  In the electric motor 40, a front-side bearing 44 made of a ball bearing is fitted on one end side (a front side that is the left end side in FIG. 2) of a rotating shaft 40a that rotates integrally with the rotor. On the other hand, a rear-side bearing 45, which is also a ball bearing, is fitted on the other end side of the rotating shaft 40a (the rear side that is the right end side in FIG. 2). Of the two bearings 44 and 45, the front bearing 44 is fixed to the end housing 13 by press-fitting an outer ring into a support hole 13 a formed in the end housing 13.

  Further, as shown in FIG. 2, a substantially cylindrical bearing insertion portion 46 whose one end is closed so that the rear side bearing 45 can be inserted and removed is provided at the substantially central portion of the bottom surface of the motor case 41. A protrusion is formed so as to extend toward the outside of the motor case 41 along the axial direction. The bearing insertion portion 46 has a substantially cylindrical side wall portion 46A and a bottom wall portion 46B that closes an opening on one end side of the side wall portion 46A. And the bearing 45 of the rear side in the rotating shaft 40a is inserted inside the bearing insertion part 46 by moving along an axial direction. Further, the bearing insertion portion 46 urges the bearing 45 to the front side in the axial direction of the rotary shaft 40a between the inner bottom surface 46b of the bottom wall portion 46B and the end surface of the bearing 45 (the right end surface in FIG. 2). A wave washer 47 is provided as a supporting member to be supported. Specifically, the wave washer 47 is formed in an annular shape, and for example, three crests and three troughs are formed. With reference to FIG. 2, the wave washer 47 contacts the outer ring of the bearing 45 and the inner bottom surface 46b of the bottom wall portion 46B, and urges the outer ring of the bearing 45 toward the front side in the axial direction.

  The bearings 44 and 45 that rotatably support both ends of the rotating shaft 40a are positioned at the same height in contact with the support hole 13a and the side wall portion 46A. Be placed. Further, since the outer diameter of the rear bearing 45 is smaller than the inner diameter of the side wall portion 46A so that the rear side bearing 45 can be inserted into and removed from the side wall portion 46A, the contact between the outer peripheral surface of the bearing 45 and the side wall portion 46A. There is a micron-order gap between the inner surface 46a as the contact surface.

  As shown in FIGS. 2 and 3, the side wall portion 46A is formed with a through hole (through portion) 48 along the radial direction orthogonal to the axial direction of the rotating shaft 40a. A C-shaped spring member 49 as a pressing member is attached to the side wall portion 46A so as to sandwich the side wall portion 46A with elastic deformation from the outside of the motor case 41.

  As shown in FIG. 3, the C-shaped spring member 49 includes a C-shaped elastic portion 50 that is slightly longer than the half circumference of the outer peripheral surface of the side wall portion 46 </ b> A and a radially inner side from the end of the elastic portion 50. It has the convex part 51 extended toward. The elastic part 50 presses the end part opposite to the end part from which the convex part 51 is extended to the outer surface of the side wall part 46A. The convex portion 51 has a shape such that, when the convex portion 51 is inserted into the through hole 48 of the side wall portion 46A from the outside of the motor case 41, the tip thereof protrudes inward from the inner side surface 46a of the side wall portion 46A. Further, as shown by a two-dot chain line in FIG. 3, the elastic portion 50 has an inner diameter L1 passing through the tip of the convex portion 51 of the side wall portion 46A before the C-type spring member 49 is attached to the side wall portion 46A. It is formed in a C shape having a smaller diameter than the outer diameter L2. The distance between the tip of the convex portion 51 and the inner surface of the elastic portion 50 in the radial direction passing through the tip of the convex portion 51 is set smaller than the total of the inner diameter of the bearing 45 and the thickness of the side wall portion 46A.

  That is, when the C-shaped spring member 49 is attached to the side wall portion 46A, the elastic portion 50 clamps the side wall portion 46A while elastically deforming it, and from the outside to the inside of the side wall portion 46A through the through hole 48. The inserted convex portion 51 presses the outer peripheral surface of the bearing 45. In this embodiment, the bearing support structure 52 that supports the rear bearing 45 is configured by the bearing insertion portion 46, the wave washer 47, and the C-shaped spring member 49.

  Next, regarding the operation of the electric power steering apparatus 10 configured as described above, in particular, when the magnitude of the force with which the bearing support structure 52 presses the rear side bearing 45 in the radial direction of the rotary shaft 40a is adjusted. The following description will focus on the action.

  Now, when the electric motor 40 is assembled to the end housing 13, the bearings 44 and 45 are externally fitted to both ends of the rotating shaft 40 a of the electric motor 40 before the assembly. First, the front bearing 44 that is fitted around the front end of the rotary shaft 40 a is fixed to the end housing 13.

  Next, the motor case 41 in which the wave washer 47 is accommodated inside the side wall 46A is mounted on the rear side of the motor body in which the rotary shaft 40a is cantilevered by the end housing 13 via the front bearing 44. It is arranged to cover from. Then, the rear bearing 45 on the rotating shaft 40 a is inserted inside the side wall 46 </ b> A of the motor case 41. In this case, since the outer diameter of the bearing 45 is smaller than the inner diameter of the side wall portion 46A, the bearing 45 is easily inserted inside the side wall portion 46A. The bearing 45 is supported while being urged in the axial direction of the rotary shaft 40a by the wave washer 47 in a state where the central axis of the bearing 45 and the central axis of the side wall portion 46A are aligned. In this case, the outer surface of the bearing 45 (the outer peripheral surface of the outer ring) is not in contact with the inner surface 46a of the side wall 46A. In this state, the motor case 41 is fixed to the end housing 13 with bolts 42.

  Subsequently, the C-shaped spring member 49 is mounted from the outside of the motor case 41 while being accompanied by elastic deformation that expands the elastic portion 50 with respect to the side wall portion 46A. And the convex part 51 of the C-shaped spring member 49 is inserted into the through hole 48 of the side wall part 46A from the outside. Then, the bearing 45 located in the side wall portion 46A is pressed in the radial direction by the convex portion 51 protruding from the inner side surface 46a of the side wall portion 46A based on the elastic force of the elastic portion 50 in the C-shaped spring member 49. Therefore, the bearing 45 is brought into close contact with the surface portion of the inner side surface 46a of the side wall portion 46A that is opposite to the through hole 48 in the radial direction, so that the end portion on the rear side of the rotary shaft 40a extends in the radial direction perpendicular to the axial direction. Position.

  Here, when the rear bearing 45 is not sufficiently positioned in the radial direction of the rotating shaft 40a by the C-type spring member 49, the C-type spring member 49 is removed from the side wall portion 46A. Then, another C-type spring member 49 having a larger elastic force than the removed C-type spring member 49 is attached to the side wall portion 46A. Then, based on the elastic force of the newly installed C-type spring member 49, the bearing 45 is more firmly attached to the inner side surface 46a of the side wall portion 46A. Therefore, the bearing 45 is reliably positioned in the radial direction of the rotating shaft 40a.

  That is, according to the present embodiment, the positioning adjustment of the bearing 45 in the radial direction of the rotating shaft 40a is completed by attaching and detaching the C-type spring member 49 provided outside the motor case 41. Therefore, when the positioning of the bearing 45 is adjusted, it is not necessary to remove the motor case 41 from the end housing 13, so that the positioning adjustment of the bearing 45 is performed quickly and easily.

  Further, according to the present embodiment, when the C-type spring member 49 is attached to the side wall portion 46 </ b> A with elastic deformation, the bearing 45 is pressed based on the elastic force of the C-type spring member 49. Therefore, when the same C-shaped spring member 49 is mounted on the side wall portion 46 </ b> A, the same amount of pressing force acts on the bearing 45 from the C-shaped spring member 49. Therefore, by adjusting the positioning of the bearing 45 using the same C-shaped spring member 49, a predetermined amount of pressing force acts on the bearing 45 from the C-shaped spring member 49. Further, when a plurality of C-type spring members 49 having different elastic forces are used, the positioning adjustment of the bearing 45 is performed while gradually changing the magnitude of the pressing force acting on the bearing 45 from the C-type spring member 49.

According to the above embodiment, the following effects can be obtained.
(1) The C-type spring member 49 applies a pressing force to the bearing 45 in the radial direction from the outside of the side wall portion 46A through the through hole 48. When changing the radial pressing force on the bearing 45, the C-type spring member 49 provided outside the side wall portion 46A is removed from the side wall portion 46A, and a new C-type spring member 49 is then attached to the side wall. Attach to part 46A. That is, the magnitude of the pressing force acting in the radial direction from the C-type spring member 49 to the bearing 45 is easily changed by the attaching / detaching operation of the C-type spring member 49 to the side wall portion 46A. Therefore, the radial positioning adjustment with respect to the rotating shaft 40a of the electric motor 40 can be performed quickly and easily.

  (2) The radial positioning operation with respect to the rotating shaft 40a of the electric motor 40 is completed by mounting the side wall portion 46A so as to be sandwiched from the outside while elastically deforming the elastic portion 50 of the C-shaped spring member 49. Therefore, the radial positioning adjustment with respect to the rotating shaft 40a of the electric motor 40 can be performed more quickly and easily.

  (3) Even when the wave washer 47 supports the bearing 45 in a state of being radially separated from the inner side surface 46a of the side wall portion 46A, the C-type spring member 49 causes the bearing 45 to move to the inner side surface 46a of the side wall portion 46A. The bearing 45 can be positioned in the radial direction by pressing so as to be in close contact.

  (4) Even if an eccentric load acts on the rotating shaft 40a of the electric motor 40 in the radial direction, the C-shaped spring member 49 presses the bearing 45 provided at the end of the rotating shaft 40a against the inner surface 46a of the side wall portion 46A. By positioning in the radial direction, it is possible to suitably suppress the radial swing of the rotating shaft 40a.

  (5) The bearing 45 is pressed based on the elastic force of the C-shaped spring member 49. Therefore, when the positioning adjustment of the bearing 45 is performed using the same C-shaped spring member 49, a predetermined pressing force of a predetermined magnitude can be applied to the bearing 45 from the C-shaped spring member 49. .

In addition, you may change the said embodiment into another embodiment as follows.
In the above embodiment, as a structure for supporting the front-side bearing 44 that is externally fitted to the end housing 13 side end of the rotating shaft 40a, the bearing insertion portion 46 in which the through hole 48 is formed, and the bearing insertion portion 46 You may provide the bearing support structure which consists of the C-type spring member 49 with which it mounts | wears. Further, without providing the bearing insertion portion 46 and the C-shaped spring member 49 at the end of the rotating shaft 40a on the motor case 41 side, the bearing insertion portion 46 and the C-shaped spring member at the end of the rotating shaft 40a on the end housing 13 side. A bearing support structure consisting of 49 may be provided.

-In the said embodiment, you may provide a coil spring, a leaf | plate spring, etc. as a supporting member which supports the rotating shaft 40a, urging | biasing the axial direction.
-In the said embodiment, an annular spring member is employ | adopted as a press member which presses the bearing 45 to the inner surface 46a of 46 A of side walls, and the inner surface of an annular spring member is used with respect to the through-hole 48 formed in 46 A of side walls. You may make it fit. In this case, the inner side surface of the annular spring member protrudes from the inner side surface 46a of the side wall portion 46A, thereby pressing the bearing 45 against the surface portion opposite to the through hole 48 in the inner side surface 46a of the side wall portion 46A.

  In the above embodiment, the pressing member that presses the bearing 45 against the inner side surface 46a of the side wall portion 46A may be mounted from the outside of the side wall portion 46A without being elastically deformed. For example, a female screw hole that opens to the inner side surface 46a of the side wall portion 46A may be provided in the side wall portion 46A, and an adjustment bolt may be screwed into the female screw hole from the outside of the side wall portion 46A. In this case, the shaft portion of the adjustment bolt changes the amount of protrusion of the side wall portion 46A from the inner side surface 46a as the adjustment bolt rotates, so that the shaft portion of the adjustment bolt causes the bearing 45 to move inside the side wall portion 46A. The magnitude of the force pressed against the side surface 46a changes.

  -In the said embodiment, the shape of the bearing insertion part which has the inner surface which supports the bearing 45 is not limited to cylindrical shape, For example, you may form in a rectangular tube shape. Further, the side wall portion 46A may be formed in a non-annular shape such as a C shape instead of a cylindrical shape.

In the above embodiment, the motor is embodied as the electric motor 40, but a motor driven by an external drive source such as an engine may be used.
In the above embodiment, the present invention is embodied in the bearing support structure of the bearing that supports the rotating shaft of the EPS 10 motor. However, the motor may be used in applications other than the EPS 10. Further, even when the motor used in the EPS 10 is a target, the EPS 10 of the present embodiment is not limited to the so-called rack assist type EPS 10, but is used in other so-called column type, pinion type, and other types of EPS. The target motor may be a target.

  DESCRIPTION OF SYMBOLS 10 ... Electric power steering apparatus (EPS), 11 ... Rack shaft, 40 ... Electric motor as a motor, 40a ... Rotating shaft, 45 ... Bearing, 46 ... Bearing insertion part, 46a ... Inner side surface as a contact surface, 47 ... Wave washer as a support member, 48... A through hole as a penetrating part, 49... C-shaped spring member as a pressing member, 50 ... an elastic part, 51 ... a convex part, 52 ... a bearing support structure.

Claims (7)

A bearing support structure for supporting a bearing in which a rotating shaft of a motor is rotatably supported,
A bearing insertion portion having a contact surface on the inner side with which the outer surface of the bearing inserted with movement in the axial direction can contact, and having a penetrating portion opened in the contact surface;
The bearing inserted into the bearing insertion portion is inserted into the through-hole of the bearing insertion portion so that a part of the bearing insertion portion protrudes from the contact surface and is inserted into the bearing insertion portion. A bearing support structure comprising: a pressing member that presses against a contact surface. The bearing support structure according to claim 1,
The bearing support structure, wherein the pressing member is mounted so as to sandwich the bearing insertion portion from outside while being elastically deformed with respect to the bearing insertion portion. The bearing support structure according to claim 2,
The pressing member has an elastic part whose one end side is located outside the penetrating part and the other end side can be pressed against the outer surface of the bearing insertion part. A bearing support structure, characterized in that a convex portion is formed which is inserted from the outside of the bearing insertion portion and has a tip protruding inside the bearing insertion portion. The bearing support structure according to claim 3,
The elastic support part is formed in a C shape, The bearing support structure characterized by the above-mentioned. In the bearing support structure according to any one of claims 1 to 4,
A bearing support structure further comprising a support member that supports the rotating shaft while urging the rotating shaft in the axial direction. In the bearing support structure according to any one of claims 1 to 5,
The bearing support structure according to claim 1, wherein the bearing insertion portion and the pressing member are provided at an end portion on at least one side of the rotating shaft. An electric power steering device that applies power transmitted from a motor to a rack shaft as an assist force for assisting a steering operation,
An electric power steering system comprising the bearing support structure according to any one of claims 1 to 6 as a bearing support structure that supports a bearing that rotatably supports a rotating shaft of the motor. apparatus.

Images