JP5513297B2 - motor - Google Patents

Description

  The present invention relates to a motor having a structure that prevents entry of foreign matter such as oil from the outside in an output shaft portion.

  Conventionally, motors of various configurations are known. One of them is a rotary armature housed in an end frame that houses a rotating armature in a bottomed cylindrical yoke housing and closes the opening of the housing. There is a configuration in which an output shaft is penetrated and supported by a ball bearing, and a tip portion of the output shaft is projected to the outside (for example, see Patent Document 1).

  By the way, when the motor is mounted on the device so that the tip of the output shaft faces upward, oil or the like adhering to the tip of the output shaft or the surface of the end frame penetrates into the bearing holding hole and moves to the ball bearing side. , Oil and the like enter the motor through the gaps between the inner ring and the output shaft, between the inner ring and the outer ring, and between the outer ring and the end frame. In particular, in the case where the commutator of the rotary armature is arranged on the end frame side, there has been a risk that the oil or the like that has entered will adhere to the commutator or the power supply brush and cause a problem.

  Therefore, a shaft sealing member (corresponding to a shielding member) is attached to the output shaft so as to cover the opening of the bearing holding hole with a labyrinth structure having a narrow gap when viewed from the output shaft direction. A structure that suppresses the arrival of oil or the like to the ball bearing side has also been proposed (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 2004-257383 Japanese Utility Model Publication No.59-255941

  However, even when a labyrinth structure consisting of a narrow gap as described above is provided, if oil or the like is transmitted radially outward on the outer surface of the shaft seal member and reaches the gap, the capillary action and the inside of the motor are negative pressure. As a result, the oil or the like may reach the ball bearing through the gap and enter the motor. Further, when oil or the like is transmitted to the inner side in the radial direction of the shaft seal member and is transmitted to the output shaft, it may reach the ball bearing side through the output shaft and enter the motor from there.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor that can more reliably prevent foreign matter from entering from the bearing portion of the output shaft.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the output shaft is rotatably supported via a bearing in a bearing holding hole provided in the housing member, and the tip end portion of the output shaft is projected outside. A motor having a mounting hole that is mounted to rotate integrally with the output shaft, shields foreign matter from entering, and has a foreign matter due to centrifugal force when rotating integrally with the output shaft. A shielding member that prevents foreign matter from entering from the tip end side of the output shaft to the bearing holding hole side due to the scattering action of the output shaft, and a mounting hole for the shielding member is provided in the axial direction on the tip side of the output shaft. together with the first member serving contacted member is fixed to cover the said shielding member second member serving contacted member is provided to the anti-tip side of the shielding member, from the contacted member also it is constituted by a low stiffness of soft material, the periphery of the mounting hole Has a flat plate portion of the annular clamping is axially retained in a state where the flat portion of the annular abuts each annularly and the second member and the first member of the shielding member, the flat plate of the shielding member The surface on the tip end side of the output shaft in the portion is provided with sealing means for preventing foreign matter from entering the mounting hole side inside the flat plate portion, and the sealing means includes the first member and the shielding member A surface on the tip side of the output shaft in the flat plate portion of the shielding member, the first member facing the surface, and the outer periphery of the output shaft The gist is to include a seal member that is sandwiched between the members so as to come into contact with the surface .

In the present invention, the shielding member for preventing foreign matter from entering from the front end portion of the output shaft to the bearing holding hole side is mounted to rotate integrally with the output shaft, the person in the flat plate portion of the annular mounting holes surrounding contact member (first member, second member) clamping Ru held axially in contact with the annular. As a result, when the output shaft rotates, foreign matter such as oil adhering to the shielding member is scattered outward in the radial direction by the action of centrifugal force due to integral rotation with the output shaft. Further, even when foreign matter such as oil adhering to the shielding member moves inward in the radial direction when the output shaft is not rotated, the flat plate portion around the mounting hole of the shielding member is in annular contact with the contacted member. The movement of foreign matter within the pressure contact portion is suppressed. Thereby, foreign substance penetration | invasion of oil etc. from the radial direction outer side and inner side of a shielding member is prevented more reliably.

  In this invention, the shielding member is held by holding the annular flat plate portion in the axial direction between the first and second members. In other words, the shielding member is in close contact with the first and second members fixed to the output shaft and is held in a highly sealable state, so that foreign matter such as oil enters the mounting hole side of the shielding member, that is, mounting. Foreign matter intrusion from the hole to the bearing side is prevented. Further, since the shielding member is sandwiched between the first and second members fixed to the output shaft, for example, even if an easy fixing mode that does not use press-fitting to the output shaft is used for fixing the shielding member, the idle rotation Can be prevented, and an integral rotation with the output shaft becomes possible.

In this invention, the shielding member is, for constitution with a low rigidity of soft material than the contacted member in pressure contact with said shield member, mutual becomes more intimate contact during pressure contact between the shielding member and the contacted member High sealing performance can be easily secured.
According to the present invention, the surface on the tip end side of the output shaft in the flat plate portion of the shielding member is provided with sealing means for preventing foreign matter from entering the mounting hole side inside the flat plate portion. That is, the sealing means prevents foreign matter such as oil from entering the mounting hole side of the shielding member, that is, foreign matter from the mounting hole to the bearing side.
In this invention, since the sealing member abuts over the three members of the shielding member, the first member, and the output shaft, the gaps between the members are efficiently sealed.

According to a second aspect of the present invention, in the motor according to the first aspect, the first member holding and holding the shielding member is a connecting member for connecting to another member, and the second member is a ball bearing. The gist of this is the inner ring.
In the present invention, the shielding member is held by holding the annular flat plate portion in the axial direction between the connecting member and the inner ring of the ball bearing. That is, the shielding member is in close contact with the connecting member and the inner ring of the ball bearing and is sandwiched in a state with high sealing performance.
The gist of the invention according to claim 3 is that, in the motor according to claim 1 or 2 , the shielding member is made of a copper-based material and the contacted member is made of an iron-based material.
In this invention, the shielding member is made of a copper-based material and the contacted member is made of an iron-based material, that is, the shielding member is made of a softer material than the contacted member. Can be more closely attached, and high sealing performance can be easily secured.

The invention described in 請 Motomeko 4 is the motor according to claim 1, wherein the seal member, the first member is formed in at least one member of the shielding member and said output shaft The gist is that it was accommodated in the storage section.

  In this invention, since the seal member is accommodated in the accommodating portion formed in at least one member of the abutted member, the shielding member, and the output shaft, the positional deviation of the seal member is prevented and the contact state of each member of the seal member is prevented. It becomes possible to stabilize.

According to a fifth aspect of the present invention, in the motor according to any one of the first to fourth aspects, the sealing means includes an annular convex portion integrally formed around the mounting hole of the flat plate portion of the shielding member. The gist is that the annular projection is annularly abutted against the abutted member and sealed.

  In the present invention, an annular convex portion is integrally formed around the mounting hole of the flat plate portion of the shielding member, and the annular convex portion is annularly abutted against the contacted member and sealed. In other words, the seal between the shielding member and the abutted member can be easily sealed without increasing the number of parts by an annular convex portion formed integrally with the shielding member, and the pressure contact between the shielding member and the abutting member can be achieved. At this time, the tip end portion of the annular convex portion is crushed by the contacted member, and it becomes easy to follow the planar shape of the contact surface, so that the mutual adhesion can be enhanced and the sealing performance can be enhanced.

According to a sixth aspect of the present invention, in the motor according to the fifth aspect , the annular convex portion is configured such that the inner peripheral surface of the mounting hole is pressed against the output shaft by a pressing force from the contacted member. The gist is that it is bent.

  In this invention, the annular convex portion provided on the shielding member so as to seal between the shielding member and the abutted member generates a pressing force against the output shaft by the pressing force from the abutting member to be in pressure contact. It is bent and configured. That is, when a pressing force is applied to the annular convex portion during the pressure contact between the shielding member and the contacted member, the inner peripheral surface of the mounting hole of the shielding member is in pressure contact with the output shaft, so that the adhesion is increased. It is also possible to improve the sealing performance between the output shaft and the output shaft.

According to a seventh aspect of the present invention, in the motor according to any one of the first to sixth aspects, the shielding member has an inclined portion having at least an outer peripheral side portion inclined toward the tip end side of the output shaft. The gist is that it is configured.

  In this invention, since the shielding member has an inclined portion whose at least the outer peripheral side portion is inclined toward the distal end side (opposite side of the housing member) of the output shaft, foreign substances due to centrifugal force at the time of integral rotation with the output shaft can be obtained. Due to the scattering action, foreign matter such as oil adhering to the shielding member can be scattered from itself, that is, farther from the bearing portion, and can contribute to the suppression of entry of foreign matter such as oil into the bearing portion.

The gist of an eighth aspect of the present invention is the motor according to the seventh aspect , wherein the shielding member is configured such that the inclined portion is set to 45 ° with respect to an axis orthogonal direction of the output shaft.
In this invention, since the inclined portion of the shielding member is set at 45 ° with respect to the direction orthogonal to the axis of the output shaft, foreign matters such as oil are more reliably moved away by the scattering action during integral rotation with the output shaft. It becomes possible to scatter.

According to a ninth aspect of the present invention, in the motor according to the seventh aspect , the shielding member is configured in a shape in which the inclined portion is curved in a direction away from the output shaft toward a radially outer side. Is the gist.

  In this invention, the shielding member has a shape in which the inclined portion is curved in a direction away from the output shaft toward the outer side in the radial direction. It is possible to reliably scatter far away.

The invention according to claim 1 0, extending in the motor according to any one of claims 1 to 9, wherein the shielding member is radially outward of the opening of the outer peripheral edge the bearing holding hole The gist is that it was made up and configured.

  In this invention, since the outer peripheral edge portion of the shielding member extends radially outward from the opening portion of the bearing holding hole, the opening of the bearing holding hole can be more reliably performed by the scattering action during the integral rotation with the output shaft. It becomes possible to scatter farther than the part.

The invention of claim 1 1, in the motor according to any one of claims 1 to 1 0, wherein the shielding member is, as a part except the outer peripheral edge portion positioned on the bearing holding hole The gist is provided.

  In this invention, since the shielding member is provided so that a part thereof excluding the outer peripheral edge portion is located in the bearing holding hole, the shielding member can be prevented from protruding in the axial direction, and the motor can be reduced in the axial direction. Can contribute to

The invention according to claim 1 2, in the motor according to any one of claims 1 to 1 1, the outer surface of the housing member, in order to suppress the movement of foreign matter into the bearing holding hole the The gist is that an annular groove is formed around the bearing holding hole.

  According to the present invention, the annular groove is formed around the bearing holding hole on the outer surface of the housing member, so that the foreign substance can be retained in the annular groove even when foreign matters such as oil move toward the bearing holding hole. It becomes possible.

The invention according to claim 1 3, in the motor according to claim 1 2, wherein the shielding member has its outer peripheral edge portion is configured to extend radially outward from the inner diameter side portion of the annular groove This is the gist.

  In the present invention, since the outer peripheral edge of the shielding member extends radially outward from the inner diameter side portion of the annular groove, for example, even when foreign matter such as oil drops from the outer peripheral edge in the axial direction. The foreign matter can be accommodated and retained in the annular groove.

Invention according to claim 1 4, in the motor according to claim 1 2 or 1 3, wherein the annular groove has its gist that the outer diameter side wall is configured so as to be inclined radially outwardly And
In this invention, since the outer circumferential side wall of the annular groove is inclined toward the outer side in the radial direction, it is possible to secure a wide opening width of the groove, and to suitably keep foreign matters such as oil in the groove. Become.

The invention according to claim 1 5, in the motor according to any one of claims 1 to 1 1, the outer surface of the housing member, in order to suppress the movement of foreign matter into the bearing holding hole the The gist is that an annular intrusion suppression portion is formed around the bearing holding hole.

  According to the present invention, an annular intrusion suppression portion is formed around the bearing holding hole on the outer surface of the housing member, so that the movement of the foreign material can be suppressed even in a situation where the foreign material such as oil moves toward the bearing holding hole. It becomes possible to suppress at the part.

The invention of claim 16 is the motor according to claim 1 5, wherein the penetration inhibiting portion is a plurality, and its gist in that provided in each annular around the bearing holding hole.
In this invention, since there are a plurality of intrusion suppression portions and each is provided in an annular shape around the bearing holding hole, it is possible to more reliably suppress the movement of foreign matters such as oil toward the bearing holding hole.

According to a seventeenth aspect of the present invention, in the motor according to any one of the first to sixteenth aspects, the bearing is constituted by a ball bearing, and the inner ring is inserted through the output shaft, and the outer ring The gist of this is that it is press-fitted into the bearing holding hole of the housing member.

  In this invention, the inner ring of the ball bearing is inserted into the output shaft (non-press-fit), and the outer ring is press-fitted into the bearing holding hole of the housing member. That is, since the space between the shielding member and the contacted member is sufficiently sealed, it is not particularly necessary to use a strong fixing mode such as press-fitting to the output shaft on the inner ring of the ball bearing. This also eliminates the need for highly accurate dimensional management of the ball bearing.

According to an eighteenth aspect of the present invention, in the motor according to any one of the first to sixteenth aspects, the bearing is constituted by a ball bearing, and an inner ring thereof is press-fitted into the output shaft. The gist of this is that it is press-fitted into the bearing holding hole of the housing member.

  In this invention, since the inner ring of the ball bearing is press-fitted into the output shaft and the outer ring is press-fitted into the bearing holding hole of the housing member, it is between the inner ring and the output shaft and between the outer ring and the inner peripheral surface of the bearing holding hole. These gaps can be made small, and it is difficult for foreign matters such as oil to enter.

The invention according to claim 19 is the motor according to any one of claims 1 to 18 , wherein the bearing is constituted by a ball bearing, and a sealing plate for closing an opening between the inner ring and the outer ring is provided. The gist of the present invention is that the sealing plate is configured to be fixed to the outer ring side and extended to the inner ring side.

  In this invention, the seal plate that closes the opening between the inner ring and the outer ring of the ball bearing is configured to be fixed to the outer ring side and extended to the inner ring side. Such a foreign matter has a so-called maze structure in which the bearing portion is forced to enter from the inner peripheral side of the seal plate. Therefore, the entry of foreign matter such as oil from the bearing portion to the inside is suppressed.

The invention of claim 2 0, in the motor according to claim 19, wherein the ball bearing, the said seal plate is configured to slidably contact with the inner ring is fixed to the outer ring side The gist.

  In this invention, since the seal plate of the ball bearing is fixed to the outer ring side and slidably comes into contact with the inner ring side, the seal plate can more reliably suppress intrusion of foreign matters such as oil to the inside.

The invention described in claim 2 1, in the motor according to any one of claims 1-2 0, the contacted member serving connecting member to reduce the connection with the other member is mounted on said output shaft The gist is that the connecting member is made of sintered metal.

  The present invention is applied to a motor having a structure using a sintered metal member as a connecting member attached to an output shaft. In other words, the connection member made of sintered metal has holes, and it is significant to apply to a motor having a configuration in which the exudation of foreign matters such as oil through the holes easily collects on the shielding member side. In other words, it is possible to use an inexpensive connecting member having a high degree of freedom in shape by sintering (molding).

The invention according to claim 2 2, in the motor according to any one of claims 1-2 1, the said housing member, rotating the armature rotates with the commutator rotates integrally with the output shaft The gist of the rotary armature is that the commutator side is accommodated to be a protruding side of the output shaft.

  In the present invention, the rotary armature is applied to a motor configured to be housed in a housing member such that the commutator side is a protruding side of the output shaft. In other words, the structure in which the bearing portion having the opening and the commutator are close to each other, i.e., foreign matter such as oil entering from the bearing portion adheres to the commutator, and the significance of application to a motor in which the trouble due to the foreign matter is likely to occur is significant. large.

  ADVANTAGE OF THE INVENTION According to this invention, the motor which can prevent the foreign material penetration | invasion from the bearing part of an output shaft more reliably can be provided.

(A) and (b) are the block diagrams of the motor in this embodiment. It is an expanded sectional view of the bearing part of an output shaft. (A)-(c) is an expanded sectional view of the bearing part of the output shaft in another example. (A) is an expanded sectional view of the bearing part of the output shaft in another example, (b) is a sectional view showing a slinger. (A) is an expanded sectional view of the bearing part of the output shaft in another example, (b) is a sectional view showing a slinger. (A) is an expanded sectional view of the bearing part of the output shaft in another example, (b) is a sectional view showing a slinger.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
Fig.1 (a) (b) shows the motor 10 of this embodiment. The motor 10 is a motor used as a drive source of an electric power steering device (EPS) for vehicles. The motor 10 is rotatably accommodated in a bottomed cylindrical yoke housing 11 so that the rotary armature 12 can rotate. In this case, the rotary armature 12 is rotatably accommodated so that the commutator 13 side of the rotary armature 12 is the opening side of the housing 11. Then, the output shaft 14 of the rotary armature 12 is projected outward from the central portion of the end frame 15 that closes the opening of the housing 11.

  Specifically, as shown in FIG. 2, a circular bearing holding hole 20 formed so as to penetrate the front and back (in the direction of the axis L1 of the motor 10) is provided at the center of the end frame 15, A ball bearing 21 is accommodated in the bearing holding hole 20. In the ball bearing 21, an outer ring 21 a is press-fitted and fixed to the bearing holding hole 20, and an inner ring 21 b is press-fitted and fixed to the output shaft 14. Incidentally, the ball bearing 21 has openings on both sides in the axial direction between the outer ring 21a and the inner ring 21b so that foreign matter does not enter from the outside into a ball 21c portion that can be rolled between the outer ring 21a and the inner ring 21b. A pair of sealing plates 21d to be closed is provided. The seal plate 21d has an annular shape that is slightly wider than the width of the opening between the outer ring 21a and the inner ring 21b. The outer peripheral edge of the seal plate 21d is fixed to the outer ring 21a and the inner peripheral edge is in slidable contact with the inner ring 21b. Thus, foreign matters are prevented from entering between the outer ring 21a and the inner ring 21b.

  Around the bearing holding hole 20 on the outer surface of the end frame 15, an annular groove 22 having an annular shape and a rectangular cross-section that is concentric with the bearing holding hole 20 is formed. One annular groove 22 is provided so as to surround the opening 20 a of the bearing holding hole 20. The annular groove 22 is intended to prevent further oil or the like adhering to the outer surface of the end frame 15 from moving from the ball bearing 21 into the motor 10 from the side of the opening 20a of the bearing holding hole 20 positioned inside. It is provided.

  A proximal end portion of a cylindrical joint 23 formed of a sintered metal such as iron is fixed to the distal end portion of the output shaft 14 protruding from the end frame 15. The inner through hole of the cylindrical joint 23 is fitted with a fixing hole 23a that is fixed to the output shaft 14 on one side in the axial direction and a drive shaft (not shown) on the steering device side as another member on the other side in the axial direction. It has at least a connecting hole 23b that locks in the rotational direction. The joint 23 can rotate integrally with the output shaft 14 by being connected by the fixed hole 23a, and transmits the rotational force of the output shaft 14 from the tip end side to the driving shaft on the steering device side that is inserted into the connecting hole 23b. Is. Such a sintered metal joint 23 can be easily produced by molding.

  Between the joint 23 and the ball bearing 21, a metal plate (which is formed of a copper material in the present embodiment, may be any soft material having a lower rigidity than the joint 23 and the ball bearing 21, and may be a material such as aluminum. The slinger 24 formed in a substantially cup shape is provided.

  Specifically, the slinger 24 includes an annular flat plate portion 24b having a circular mounting hole 24a corresponding to the cross-sectional shape of the output shaft 14 at the center portion, and folding of the radially outer end portion of the flat plate portion 24b. And an annular inclined portion 24d bent to one side from the bent portion 24c. The bent part 24c of the slinger 24 and the outer peripheral edge part 24e of the inclined part 24d are provided concentrically with the mounting hole 24a. In the mounted state in which the slinger 24 is fitted into the output shaft 14 through the mounting hole 24a, the flat plate portion 24b is orthogonal to the axis L1 of the output shaft 14, and the inclined portion 24d is in relation to the flat plate portion 24b (with respect to the axis L1). It is inclined linearly at a predetermined angle θ ° (45 ° in this embodiment) with respect to the orthogonal line L2. In this case, the inclined portion 24d is directed to the distal end side (the side opposite to the end frame 15) of the output shaft 14.

  Further, the slinger 24 has a flat plate portion 24b that is pressed and clamped between the end surface 23d of the joint 23 and the end surface 21e of the inner ring 21b of the ball bearing 21 made of a ferrous material. The slinger 24 is mounted so as to rotate integrally with the output shaft 14 by being inserted into the output shaft 14. However, the slipper 24 is more reliably prevented from slipping by being sandwiched between the joint 23 and the inner ring 21 b of the ball bearing 21. Has been made. When the joint 23 and the inner ring 21b of the ball bearing 21 are clamped, the flat plate portion 24b of the slinger 24 is not in contact with the seal plate 21d and the outer ring 21a of the ball bearing 21. Further, a part of the flat plate portion 24b and the inclined portion 24d of the slinger 24 are located in the bearing holding hole 20, and the outer peripheral edge portion 24e side is located on the outer side in the axial direction of the bearing holding hole 20 from the middle of the inclined portion 24d. ing. The outer peripheral edge 24e of the slanted portion 24d of the slinger 24 is positioned outside the opening edge of the bearing holding hole 20 in the radial direction, up to a substantially central portion of the annular groove 22 provided outside the bearing holding hole 20. It extends.

  A taper surface 23c is formed at the base end portion of the fixing hole 23a of the joint 23 so as to increase in diameter toward the end portion. The taper surface 23c is formed so as to be positioned in the annular accommodating space S having a triangular cross section. An O-ring 25 made of an elastic member is attached to the output shaft 14. The O-ring 25 has a circular shape in cross section, and is elastic on three surfaces: a tapered surface 23c at the base end portion of the fixing hole 23a, a surface on the joint 23 side of the flat plate portion 24b of the slinger 24, and an outer peripheral surface of the output shaft 14. It is in close contact with force. The O-ring 25 is provided to prevent movement of oil or the like from the joint 23 side toward the mounting hole 24a of the slinger 24.

  In the motor 10 configured as described above, for example, when the output shaft 14 is attached to the power steering device so that the output shaft 14 faces the top direction (upward from the horizontal plane), the lubrication applied to the joint 23 portion, the gear at the connection destination, and the like. Oil or the like such as oil may scatter and adhere to the surface of the slinger 24 on the joint 23 side when the output shaft 14 rotates. Further, when the output shaft 14 is directed close to the vertical direction, oil or the like may sag on the joint 23 side surface of the slinger 24 even when the output shaft 14 is stopped. In particular, since the joint 23 made of sintered metal has pores, oil may ooze out from the connection hole 23b of the joint 23 to the outside.

  At this time, even if oil on the joint 23 side of the slinger 24 moves toward the mounting hole 24a of the slinger 24, further movement by the seal by the O-ring 25 is prevented. In other words, oil or the like enters the ball bearing 21 side through the gap between the inner peripheral surface of the mounting hole 24 a of the slinger 24 and the outer peripheral surface of the output shaft 14, and hence into the motor 10. It is surely prevented.

  Further, oil or the like accumulated on the joint 23 side surface of the slinger 24 moves outward in the radial direction by the centrifugal force acting by the rotation of the slinger 24 accompanying the rotation of the output shaft 14, and the outer peripheral edge 24e of the inclined portion 24d. Spatters from the outside. At this time, oil and the like are scattered further from the inclined shape of the inclined portion 24d. Further, since the outer peripheral edge 24e of the slinger 24 in which oil or the like scatters is located on the annular groove 22 on the radially outer side of the bearing holding hole 20 as viewed in the axial direction, at least radially outward including the annular groove 22 Scatter. Therefore, even if the scattered oil or the like adheres to the outer surface of the end frame 15 and moves to the bearing holding hole 20, further movement to the inside is prevented by the annular groove 22. As a result, entry of oil or the like from the ball bearing 21 into the motor 10 is more reliably prevented.

Next, characteristic effects of the present embodiment will be described.
(1) The slinger 24 for preventing foreign matter from entering the bearing holding hole 20 side from the tip end side of the output shaft 14 includes an annular flat plate portion 24b around the mounting hole 24a and the joint 23 and the inner ring 21b of the ball bearing 21. Thus, it is clamped and held in the axial direction (pressed and clamped), is annularly pressed, and is mounted so as to rotate integrally with the output shaft 14. Thereby, when the output shaft 14 is rotated, foreign matters such as oil adhering to the slinger 24 are scattered radially outward by the action of centrifugal force due to the integral rotation with the output shaft 14. Even if foreign matter such as oil adhering to the slinger 24 moves radially inward when the output shaft 14 is not rotating, the flat plate portion 24b of the slinger 24 is annularly formed between the joint 23 and the inner ring 21b of the ball bearing 21. Due to the pressure contact (adhesion), the movement of the foreign matter within the pressure contact portion is suppressed. As a result, the entry of foreign matter such as oil from the radially outer side and the inner side of the slinger 24 can be more reliably prevented, and the penetration of the bearing 21 into the motor 10 can be more reliably prevented. In addition, since the clamping performance between the joint 23 and the inner ring 21b of the ball bearing 21 and the sealing performance around the mounting hole 24a are improved, a strong fixing mode such as press-fitting that is more closely attached to the output shaft 14 to the slinger 24 can be unnecessary. An easy fixing mode of the slinger 24 can also be adopted. Further, since the flat plate portion 24b is held between the joint 23 and the inner ring 21b of the ball bearing 21, the flat plate portion 24b can be easily held.

  (2) The flat plate portion 24b of the slinger 24 formed of a copper material having low rigidity is pressed and clamped between both end surfaces 23d and 21e of the joint 23 formed of a steel material having high rigidity and the inner ring 21b of the ball bearing 21. Is done. As a result, the flat plate portion 24b of the slinger 24 with low rigidity and softness follows the surface shape of the end surfaces 23d and 21e with high rigidity during the clamping. Easy to secure. That is, foreign matter such as oil passing between the slinger 24 and the joint 23 enters the output shaft 14 side, and the output shaft 14 of foreign matter such as oil passing between the slinger 24 and the inner ring 21b of the ball bearing 21. The intrusion to the side can be suppressed.

  (3) Since the O-ring 25 is attached to the output shaft 14 so as to straddle the three members of the slinger 24, the output shaft 14 and the joint 23, it is easy to attach the general O-ring 25 to the output shaft 14. Can be sealed. Further, since the O-ring 25 is in contact with the three members of the slinger 24, the output shaft 14, and the joint 23, the gap between the members can be efficiently sealed.

  (4) The accommodation space S is formed between the slinger 24, the output shaft 14 and the joint 23 at the tapered surface 23c formed in the fixing hole 23a of the joint 23, and the O-ring 25 is accommodated in the accommodation space S. The Therefore, it is possible to prevent displacement of the O-ring 25 and to stabilize the contact state of the O-ring 25 with respect to each member.

  (5) The slinger 24 has an inclined portion 24d whose outer peripheral side portion is inclined toward the distal end side (the side opposite to the end frame 15) of the output shaft 14, and therefore, due to the centrifugal force during integral rotation with the output shaft 14. Foreign matter such as oil adhering to the slinger 24 can be scattered from itself, that is, more distant from the bearing 21 portion by the scattering action of the foreign matter, contributing to the suppression of foreign matter such as oil entering the bearing 21 portion. Can do. In addition, since the sloping portion 24d of the slinger 24 is set to 45 ° with respect to the direction perpendicular to the axis of the output shaft 14, foreign matters such as oil can be more reliably scattered far away.

  (6) Since the outer peripheral edge 24e of the slinger 24 extends radially outward from the opening 20a of the bearing holding hole 20, the bearing of the slinger 24 is more reliably held by the scattering action during integral rotation with the output shaft 14. It can be scattered farther than the opening 20a of the hole 20 and can contribute to the suppression of the entry of foreign matter such as oil into the bearing 21 portion.

  (7) Since the annular groove 22 is formed around the bearing holding hole 20 on the outer surface of the end frame 15, the foreign substance such as oil moves toward the bearing holding hole 20 in the annular groove 22. This can contribute to the suppression of entry of foreign matter such as oil into the bearing 21 portion.

  (8) Since the outer peripheral edge 24e of the slinger 24 extends radially outward from the inner diameter side portion of the annular groove 22, for example, foreign matter such as oil drops from the outer peripheral edge 24e in the axial direction. However, the foreign matter can be accommodated and retained in the annular groove 22, which can contribute to the suppression of foreign matter such as oil in the bearing 21 portion.

  (9) Since the slinger 24 is sandwiched between the joint 23 attached to the output shaft 14 and the inner ring 21b of the ball bearing 21, for example, an easy fixing mode that does not use press-fitting or the like is used to fix the slinger 24. However, the slipping of the slinger 24 can be prevented by the clamping, and the integral rotation with the output shaft 14 can be achieved.

  (10) Since the inner ring 21b of the ball bearing 21 is press-fitted into the output shaft 14 and the outer ring 21a is press-fitted into the bearing holding hole 20 of the end frame 15, the outer ring 21a and the bearing are held between the inner ring 21b and the output shaft 14. Each gap between the inner peripheral surface of the hole 20 can be reduced, and entry of foreign matter such as oil can be made difficult.

  (11) The seal plate 21d that closes the opening between the inner ring 21b and the outer ring 21a of the ball bearing 21 is configured to be fixed to the outer ring 21a side and extended to the inner ring 21b side. The so-called labyrinth structure in which foreign matter such as oil that has entered from the inside is forced to enter from the inner peripheral side of the seal plate 21d at the bearing 21 portion. Therefore, entry of foreign matter such as oil from the bearing 21 portion to the inside can be suppressed. Further, even if foreign matters such as oil components reach the inner ring 21b side when the seal plate 21d reaches the inner ring 21b side, the seal plate 21d is configured to come into sliding contact with the inner ring 21b side. Intrusion of foreign matter such as can be more reliably suppressed.

  (12) Since the slinger 24 is provided so that a part of the slinger 24 except the outer peripheral edge portion 24e is positioned in the bearing holding hole 20, the slinger 24 can be prevented from protruding in the axial direction, and the axial direction of the motor 10 can be suppressed. Can contribute to downsizing.

  (13) The joint 23 is made of sintered metal. However, the joint 23 made of sintered metal has holes, and oozing of foreign matters such as oil components through the holes tends to gather on the slinger 24 side. However, since the sealing performance of the mounting hole 24a portion of the slinger 24 is enhanced by the O-ring 25, the significance of applying to the motor 10 of this embodiment using such a sintered metal joint 23 is great. In other words, it is possible to use an inexpensive joint 23 with a high degree of freedom in shape by sintering (molding).

  (14) The rotary armature 12 is housed in the end frame 15 so that the commutator 13 side of the rotary armature 12 is the protruding side of the output shaft 14. In other words, the configuration in which the bearing 21 portion having the opening and the commutator 13 are close to each other, that is, foreign matter such as oil entering from the bearing 21 portion adheres to the commutator 13 and is liable to cause problems due to the foreign matter adhesion. The significance applied to the motor 10 is great.

In addition, you may change embodiment of this invention as follows.
-In the slinger 24 used by the said embodiment, you may change suitably a shape, an attachment structure, an attachment position, etc.

For example, the inclination angle of the inclined portion 24d may be set to other than 45 °.
Further, as shown in FIG. 3A, the sloping portion 24d of the slinger 24 may be curved in a direction away from the output shaft 14 toward the radially outer side. As a result, foreign matters such as oil can be more reliably scattered far away by the scattering action during integral rotation with the output shaft 14.

Further, the slinger 24 may be formed in a shape having two or more bent portions.
Further, although the slinger 24 is clamped between the inner ring 21b of the ball bearing 21 and the joint 23, the clamping mode may be changed as appropriate, for example, between the inner ring 21b and another member provided separately. Moreover, it is good also as an aspect attached to the output shaft 14 without using clamping. Further, the slinger 24 may be press-fitted into the output shaft 14.

In addition, although a part of the slinger 24 is disposed in the bearing holding hole 20, the slinger 24 may be mounted on the output shaft 14 in a state where the whole protrudes from the bearing holding hole 20 to the outer portion.
Moreover, you may produce the slinger 24 other than a metal plate.

-In the annular groove 22 formed in the outer surface of the end frame 15 of the said embodiment, you may change suitably a shape, a number, a position, etc.
For example, as shown in FIG. 3B, the outer diameter side wall 22a of the annular groove 22 may be inclined toward the radially outer side. As a result, a wide opening width of the groove 22 can be secured, and foreign matters such as oil can be suitably retained in the groove 22. Further, at the site on the top side of the groove 22, foreign matter such as oil easily enters the groove 22 from the top direction on the outer diameter side, and at the site on the ground side, foreign matter such as oil collected in the groove 22. Tends to flow out in the ground direction on the outer diameter side.

  Moreover, as shown in FIG.3 (c), the cyclic | annular groove | channel 22 may be provided twice and you may provide more. Thereby, the movement of foreign matters such as oil components toward the bearing holding hole 20 can be more reliably suppressed.

Further, not only the groove shape like the annular groove 22 but also, for example, an annular convex portion can suppress the movement of foreign matters such as oil toward the bearing holding hole 20.
In the above embodiment, the accommodation space S of the O-ring 25 is formed by forming the tapered surface 23c in the fixing hole 23a of the joint 23. However, a recess or the like is formed in the slinger 24 or the output shaft 14 to form the accommodation space S. It may be formed. Further, the accommodation space S may be formed across two or more members of the joint 23, the slinger 24 and the output shaft 14. Alternatively, the accommodation space S may not be formed separately, and the O-ring 25 may be interposed in the gap between the members.

In the above embodiment, the O-ring 25 is used as the sealing member, but a sealing member other than the O-ring or a sealing means for sealing depending on the structure may be used.
For example, as shown in FIGS. 4 to 6, the sealing means may be provided integrally with the slinger 24. In this way, it is possible to reduce the number of parts and the number of assembly steps.

  As shown in FIGS. 4A and 4B, annular convex portions 24f that are concentric around the mounting hole 24a are integrally formed on the front and back surfaces of the flat plate portion 24b of the slinger 24. The annular convex portions 24f are triangular in cross section, and are provided on the surface of the flat plate portion 24b of the slinger 24, that is, the surface facing the end surface 23d of the joint 23, and annularly abuts around the end surface 23d and the mounting hole 24a. And seal. One is provided on the back surface of the flat plate portion 24b of the slinger 24, that is, the surface facing the end surface 21e of the inner ring 21b of the ball bearing 21, and seals by annularly contacting the end surface 21e and the mounting hole 24a.

  As a result, when the slinger 24 is clamped and held, the tip of the annular convex portion 24f on the front surface side of the flat plate portion 24b is easily crushed by the end surface 23d of the joint 23 to follow the planar shape of the end surface 23d. Since the tip of the annular convex portion 24f is easily crushed by the end surface 21e of the inner ring 21b of the ball bearing 21 to follow the planar shape of the end surface 23d, the mutual adhesion can be enhanced and the sealing performance can be enhanced. Further, it can be easily sealed by the annular convex portion 24f integrally formed with the slinger 24, and the O-ring 25 can be omitted if the seal is sufficient.

  Further, as shown in FIGS. 5A and 5B, an annular contact portion 24g made of an elastic member is integrally formed around the mounting hole 24a on the front and back surfaces of the flat plate portion 24b of the slinger 24 by baking or the like. . Thus, similarly to the above, the annular contact portion 24g on the front surface side of the flat plate portion 24b is crushed by the end surface 23d of the joint 23 when the slinger 24 is held under pressure, and the annular contact portion 24g on the back surface side. Is crushed and followed by the end surface 21e of the inner ring 21b of the ball bearing 21, so that the mutual adhesion is high and the sealing performance is high.

  Further, as shown in FIGS. 6A and 6B, the annular convex portion 24h may be formed by bending the flat plate portion 24b of the slinger 24 in, for example, a semicircular shape from the back surface side to the front surface side. As a result, when the slinger 24 is held under pressure, the inner edge of the mounting hole 24a of the slinger 24 is pressed against the output shaft 14 by the pressing force from the end surface 23d of the joint 23, so that the mutual adhesion is improved. Similarly to the above, the sealing performance between the end surface 23d of the joint 23 is enhanced, and the sealing performance between the slinger 24 and the output shaft 14 can be enhanced.

  In the above embodiment, the outer ring 21a of the ball bearing 21 is press-fitted into the bearing holding hole 20 and the inner ring 21b is press-fitted into the output shaft 14. However, for example, the inner ring 21b of the ball bearing 21 is inserted into the output shaft 14 (non- Press fit). That is, since the space between the joint 23 and the slinger 24 or between the slinger 24 and the output shaft 14 is sufficiently sealed, a strong fixing mode such as press-fitting the output shaft 14 into the inner ring 21b of the ball bearing 21 is particularly preferable. It may not be used. This also eliminates the need for highly accurate dimensional management of the ball bearing 21.

  In the above embodiment, the sintered metal joint 23 is used, but the present invention may be applied to a structure using a joint formed by other processing. Moreover, you may apply to the thing without the joint 23. FIG.

In the above embodiment, the ball bearing 21 is used as the bearing that supports the output shaft 14, but the present invention may be applied to a configuration using a bearing other than the ball bearing.
In the above embodiment, the present invention is applied to the motor 10 having the commutator 13. However, the present invention may be applied to a motor having another configuration, such as a brushless motor.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 12 ... Rotary armature, 13 ... Commutator, 14 ... Output shaft, 15 ... End frame (housing member), 20 ... Bearing holding hole, 20a ... Opening part, 21 ... Ball bearing, 21a ... Outer ring, 21b ... inner ring (contacted member, second member), 21d ... seal plate, 22 ... annular groove (intrusion suppression part), 22a ... outer diameter side wall, 23 ... joint (contacted member, first member, connecting member) ), 24 ... Slinger (shielding member), 24a ... Mounting hole, 24b ... Flat plate portion, 24d ... Inclined portion, 24e ... Outer peripheral edge portion, 24f ... Ring convex portion (sealing means), 24g ... Ring contact portion (sealing means) ), 24h... Annular projection (sealing means), 25... O-ring (sealing means, sealing member).

Claims (22)

A motor configured to rotatably support an output shaft through a bearing in a bearing holding hole provided in the housing member, and projecting a tip portion of the output shaft to the outside;
The output shaft is mounted so as to rotate integrally with the output shaft in the form of a ring having a mounting hole, and the foreign matter is scattered by the centrifugal force during the integral rotation with the output shaft. A shielding member that prevents foreign matter from entering the bearing holding hole side from the tip end side of the
A first member, which is an abutting member that covers the mounting hole of the shielding member in the axial direction, is fixed to the distal end side of the output shaft, and a first member, which is an abutting member, is located on the opposite end side of the shielding member. 2 members are provided,
The shielding member is made of a soft material having lower rigidity than the contacted member , and has an annular flat plate portion around the mounting hole, and the annular flat plate portion of the shielding member is the first member. And the second member are held in the axial direction in a state of being in annular contact with each other,
The surface on the tip end side of the output shaft in the flat plate portion of the shielding member is provided with a sealing means for preventing foreign matter from entering the mounting hole side inside the flat plate portion,
The sealing means is disposed inside a contact portion between the first member and the flat plate portion of the shielding member, and a surface of the flat plate portion of the shielding member on the front end portion side of the output shaft, and the surface thereof A motor including a seal member sandwiched between the first member and the outer peripheral surface of the output shaft so as to contact each other . The motor according to claim 1 ,
The motor according to claim 1, wherein the first member holding and holding the shielding member is a connecting member for connecting to another member, and the second member is an inner ring of a ball bearing. The motor according to claim 1 or 2 ,
The motor is characterized in that the shielding member is made of a copper-based material and the contacted member is made of an iron-based material. The motor according to any one of claims 1 to 3 ,
The motor, wherein the seal member is housed in a housing portion formed in at least one member of the first member, the shielding member, and the output shaft. The motor according to any one of claims 1 to 4 ,
The sealing means includes an annular convex portion integrally formed around the mounting hole of the flat plate portion of the shielding member, and seals by annularly contacting the contacted member at the annular convex portion. motor. The motor according to claim 5 , wherein
The motor, wherein the annular convex portion is bent so that an inner peripheral surface of the mounting hole is pressed against the output shaft by a pressing force from the contacted member. The motor according to any one of claims 1 to 6 ,
The motor is characterized in that the shielding member has an inclined portion having at least an outer peripheral side portion inclined toward the tip end side of the output shaft. The motor according to claim 7 , wherein
The motor according to claim 1, wherein the shielding member is configured such that the inclined portion is set to 45 ° with respect to the direction perpendicular to the axis of the output shaft. The motor according to claim 7 , wherein
The motor is characterized in that the shielding member is configured in a shape that curves in a direction away from the output shaft toward the radially outer side of the inclined portion. The motor according to any one of claims 1 to 9 ,
The motor is characterized in that the shielding member is configured such that an outer peripheral edge thereof extends radially outward from an opening of the bearing holding hole. The motor according to any one of claims 1 to 10 ,
The motor according to claim 1, wherein the shielding member is provided so that a part thereof excluding an outer peripheral edge portion is positioned in the bearing holding hole. The motor according to any one of claims 1 to 11,
A motor characterized in that an annular groove is formed around the bearing holding hole on the outer surface of the housing member so as to suppress the movement of foreign matter to the bearing holding hole. The motor according to claim 1 2,
The motor is characterized in that the shielding member is configured such that an outer peripheral edge thereof extends radially outward from an inner diameter side portion of the annular groove. The motor according to claim 1 2 or 1 3,
The motor according to claim 1, wherein the annular groove is configured such that an outer-diameter side wall is inclined toward a radially outer side. The motor according to any one of claims 1 to 11,
A motor characterized in that an annular intrusion suppression portion is formed around the bearing holding hole on the outer surface of the housing member so as to suppress the movement of foreign matter to the bearing holding hole. The motor according to claim 1 5,
The motor according to claim 1, wherein there are a plurality of intrusion suppression portions, each being provided in an annular shape around the bearing holding hole. The motor according to any one of claims 1 to 16 ,
The motor is characterized in that the bearing is constituted by a ball bearing, an inner ring thereof is inserted through the output shaft, and an outer ring is press-fitted into a bearing holding hole of the housing member. The motor according to any one of claims 1 to 16 ,
The motor is characterized in that the bearing is constituted by a ball bearing, an inner ring thereof is press-fitted into the output shaft, and an outer ring is press-fitted into a bearing holding hole of the housing member. The motor according to any one of claims 1 to 18 ,
The bearing is constituted by a ball bearing and has a seal plate that closes an opening between the inner ring and the outer ring, and the seal plate is fixed to the outer ring side and extended to the inner ring side. A motor characterized by that. The motor according to claim 19 ,
The ball bearing is configured so that the seal plate is fixed to the outer ring side and is slidably contacted to the inner ring side. The motor according to any one of claims 1-2 0,
The motor is characterized in that the output shaft is attached with a connecting member which is a member to be abutted to be connected to another member, and the connecting member is made of sintered metal. In the motor according to any one of claims 1 to 21,
A rotating armature having a commutator that rotates integrally with the output shaft is rotatably accommodated in the housing member,
The motor according to claim 1, wherein the rotary armature is accommodated such that the commutator side is a protruding side of the output shaft.

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