JP5179404B2 - Bearing device and motor - Google Patents

Description

  The present invention relates to a bearing device in which a rotating shaft is inserted and supported by an oil-impregnated bearing, and a motor including the bearing device.

  As a bearing device for a rotating shaft, for example, as shown in Patent Documents 1 to 3, etc., an oil-impregnated bearing is used to support the rotating shaft (worm shaft in Document 1). The oil-impregnated bearing is made of a porous material and impregnated with lubricating oil, and supports the rotating shaft while supplying the lubricating oil to a sliding contact surface (bearing inner peripheral surface) with the rotating shaft.

JP 2003-199290 A JP 2000-32703 A JP-A-8-19210

  By the way, a clearance (radial gap) is set between the rotary shaft and the inner peripheral surface of the oil-impregnated bearing. The oil-impregnated bearing forms a lubricating oil film in the clearance to support the rotary shaft. If the amount of lubricating oil is reduced, a stable lubricating oil film cannot be formed. As a result, rattling (roughness) occurs due to the clearance between the rotating shaft and the inner peripheral surface of the bearing, and this is one of the factors that hinder low vibration and low noise during motor driving.

  Therefore, in each of the above Patent Documents 1 to 3, the plate member (Patent Documents 1 and 2) having a function of receiving the lubricating oil scattered by the rotation of the rotating shaft and returning it to the bearing side is the same, although the configuration is slightly different. The oil-impregnated resin member (Patent Document 3) having the above function is provided in contact with the bearing so that a stable lubricating oil film can be formed in the clearance between the rotating shaft and the inner peripheral surface of the bearing.

However, there is a limit to the suppression of the shakiness of the rotating shaft that relies on the lubricating oil film, and further improvement has been required for the demand to further suppress the shakiness.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a bearing device capable of further suppressing the shakiness of the rotating shaft and a motor including the bearing device. It is in.

In order to solve the above-mentioned problem, the invention according to claim 1 is a bearing device for inserting and supporting a rotating shaft in an oil-impregnated bearing, and is elastic and can be impregnated with lubricating oil similar to the bearing. And an oil supply member that makes contact with the axial end of the oil-impregnated bearing and contact with the outer peripheral surface of the rotary shaft, and the oil supply member has an annular shape with an inner diameter thereof. The outer diameter of the rotating shaft is set to be smaller, the bearing is provided in a housing, and the oil supply member is fixed by being sandwiched between the housing and a fixing member attached to the housing. The gist of the member is a functional part having a function in addition to the fixing of the oil supply member .

  In the present invention, an oil supply member that is elastic and can be impregnated with the same lubricating oil as that of the oil-impregnated bearing, and that makes contact with the axial end of the oil-impregnated bearing and contact with the outer peripheral surface of the rotating shaft. Is provided. That is, when the oil supply member abuts on the axial end of the oil-impregnated bearing, the recovery of the lubricating oil exuded from the bearing and the oil supply to the bearing are performed, and the amount of lubricating oil in the bearing is secured, A stable lubricating oil film can be formed in the clearance between the rotating shaft and the inner peripheral surface of the bearing, and rattling of the rotating shaft is suppressed, and the oil supply member abuts the outer peripheral surface of the rotating shaft with elasticity. Therefore, rattling of the rotating shaft is suppressed, and rattling of rattling can be further suppressed.

In this invention, the inner diameter of the oil supply member from being set smaller than the outer diameter of the rotary shaft, the oil supply member is always in contact with a resilient to the outer peripheral surface of the rotating shaft. Thereby, the shakiness of a rotating shaft can be suppressed reliably.

In this invention, the oil supply member is sandwiched and fixed between the housing and the fixing member attached to the housing. That is, the oil supply member can be easily fixed .

  In this invention, the oil supply member is fixed by a functional component having a function in addition to the fixing of the oil supply member. That is, since functional parts having other functions also function as a fixing member for fixing the oil supply member, the parts can be made common and the number of parts can be reduced.

According to a second aspect of the present invention, there is provided a motor including the bearing device according to the first aspect of the present invention, which inserts and supports a rotating shaft that rotates by driving the motor.
In the present invention, it provided a bearing apparatus according to claim 1, for further suppressing the rattling of the rotation axis is possible, low vibration and noise of the motor becomes possible.

According to a third aspect of the present invention, the motor according to the second aspect includes a motor main body that rotates the motor shaft, and a speed reduction mechanism that is drivingly connected to the motor shaft in a gear housing that is assembled to the motor main body. The gist of the invention is that the worm shaft constituting the speed reduction mechanism is supported by the bearing, and the oil supply member is provided to the bearing and the worm shaft.

  In this invention, since the oil supply member is provided for the worm shaft and its bearing in the gear housing, it is possible to further suppress the rattling of the worm shaft, and to reduce the vibration and noise of the motor.

According to a fourth aspect of the present invention, in the motor according to the third aspect , the motor shaft is interposed between the worm shaft and the rotational force from the motor shaft side is transmitted to the worm shaft side. rotation from the worm shaft side are those comprising a clutch for blocking the oil supply member that is mounted on the housing and the housing is fixed sandwiched between the said functional component that serves as part of said clutch The gist.

  In this invention, the oil supply member is sandwiched and fixed between the housing and a functional component that is mounted on the housing and functions as a part of the clutch. In other words, the oil supply member can be easily fixed, and the functional part that functions as a part of the clutch also functions as a fixing member that fixes the oil supply member, so that the parts can be shared and the number of parts can be reduced. Is possible.

  ADVANTAGE OF THE INVENTION According to this invention, the bearing apparatus which can aim at the further suppression of the shakiness of a rotating shaft, and a motor provided with the bearing apparatus can be provided.

It is sectional drawing which shows the motor in this embodiment. It is a partial expanded sectional view of the motor which shows the bearing part of a worm shaft, and its circumference. It is sectional drawing for demonstrating the structure of the bearing part of a worm shaft, (a) is after an assembly | attachment, (b) is a figure which shows the state before an assembly | attachment.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a motor 1 of the present embodiment. The motor 1 of this embodiment is used as a drive source for a vehicle-mounted power window device, and includes a motor body 2, a speed reduction unit 3, and a clutch 4.

  In the motor body 2, a pair of magnets 6 are fixed to the inner peripheral surface of a substantially bottomed flat cylindrical yoke housing 5, and an armature (armature) 7 is accommodated inside the magnet 6. The armature 7 has a motor shaft 8, and the base end portion of the motor shaft 8 is rotatably supported by a bearing 9 provided at the center of the bottom of the yoke housing 5. A coil 10 is wound around the armature 7, and a terminal wire of the coil 10 is connected to a commutator 11 fixed to a predetermined portion on the tip end side of the motor shaft 8.

  A holder main body 12 a of the brush holder 12 is fitted into the opening of the yoke housing 5, and a connector portion 12 b extends from the holder main body 12 a to the radially outer side of the yoke housing 5. A bearing 13 is provided at the center of the holder body 12a, and the tip end side of the motor shaft 8 is rotatably supported by the bearing 13. The holder main body 12a holds a pair of power supply brushes 14 that are in sliding contact with the commutator 11. The drive power supplied from the outside is supplied to the power supply brush 14 through the connector portion 12b, and is supplied to the coil 10 through the commutator 11 in sliding contact. Power is supplied to rotate the armature 7.

  And the holding part 12c which is provided in the outer peripheral part of the holder main body 12a and which has the sealing member 15 is clamped by both opening parts of the yoke housing 5 and the gear housing 21 mentioned later, and the brush holder 12 is in the opening part of the yoke housing 5. The screw 16 is attached to the flange portion 5 a outside the opening of the housing 5, and the yoke housing 5 is fixed to the gear housing 21.

  In the speed reduction portion 3, the resin gear housing 21 is formed in a predetermined shape so as to accommodate the worm shaft 22, the worm wheel 23, the clutch 4 and the like constituting the speed reduction mechanism. A clutch housing recess 21b having a circular cross section is formed in the center of the bottom of the opening recess 21a provided on the opening side (motor body 2 side) of the gear housing 21, and the motor shaft 8 is further formed in the center of the bottom of the housing recess 21b. A worm shaft accommodating recess 21c extending in the axial direction is formed. The worm shaft housing recess 21c is formed with a wheel housing recess 21d that bulges in a circular shape in a direction orthogonal to the extending direction of the housing recess 21c.

  A pair of bearings 24 and 25 made of oil-impregnated bearings are mounted at predetermined positions in the worm shaft housing recess 21c, respectively, and a base end portion of the worm shaft 22 inserted coaxially with the motor shaft 8 into the bearings 24 and 25, and A tip portion is rotatably supported. A worm portion 22a is formed between the bearings 24 and 25 on the worm shaft 22, and the worm portion 22a is meshed with a worm wheel 23 rotatably accommodated in a wheel accommodating recess 21d. An output shaft 26 that is drivingly connected to a window regulator (not shown) for opening and closing (raising and lowering) the window glass is connected to the worm wheel 23 so as to rotate integrally with the wheel 23.

  As shown in FIG. 2, a clutch 4 is interposed between the worm shaft 22 and the motor shaft 8. The clutch 4 transmits the rotational force of the motor shaft 8 based on the drive of the motor main body 2 from the worm shaft 22 to the output shaft 26 side, while the worm force acts on the output shaft 26 from the load side (wind glass). The shaft 22 is operated to prevent rotation and lock the rotation of the output shaft 26. In other words, the clutch 4 opens and closes the window glass based on the drive of the motor body 2, while the window glass is affected by its own weight, vibration during driving of the vehicle, etc. It prevents the glass from falling unexpectedly.

  In the clutch 4, a collar 31 in which the cylindrical portion 31 a is fitted in the clutch housing recess 21 b of the gear housing 21 is provided. A flange portion 31b is provided at one end of the cylindrical portion 31a in the axial direction, and the flange portion 31b is attached to the bottom portion of the opening-side recess 21a so that the collar 31 is mounted in a non-rotating state. At the other end in the axial direction of the cylindrical portion 31a, an inner extending portion 31c extending inward in the radial direction and having an annular shape is provided, and the worm shaft 22 is inserted through the central opening of the extending portion 31c.

  Inside the cylindrical portion 31a of the collar 31, there is provided a driven side rotating body 32 fixed to the base end portion of the shaft 22 so that the worm shaft 22 and the worm shaft 22 are connected to each other by concave and convex fitting and rotate integrally. A drive side rotator 33 provided corresponding to the driven side rotator 32 is mounted at the tip of the shaft 8 so as to rotate integrally with the motor shaft 8 and is engaged with the driven side rotator 32 in the circumferential direction. Is possible. A plurality of roller members 34 (only one is shown in FIG. 2) are disposed between the outer peripheral portion of the driven side rotating body 32 and the inner peripheral surface of the cylindrical portion 31a of the collar 31. The roller member 34 is a support member. 35.

  When the drive-side rotator 33 rotates together with the motor shaft 8 based on the drive of the motor body 2, the drive-side rotator 33 engages with the driven-side rotator 32 in the circumferential direction and the rotational force from the motor shaft 8. Is transmitted to the worm shaft 22 side. On the other hand, when a rotational force acts on the output shaft 26 from the load side and the driven-side rotating body 32 slightly rotates together with the worm shaft 22, the outer peripheral portion of the driven-side rotating body 32 and the inner peripheral surface of the cylindrical portion 31a of the collar 31 Thus, the roller member 34 is clamped in the radial direction, the further rotation of the driven side rotating body 32 is prevented, and the rotation of the worm shaft 22 (output shaft 26) is locked.

  As shown in FIGS. 2 and 3A, an annular oil supply member 36 is disposed on the bottom surface of the clutch housing recess 21 b, and the axial direction is formed by the bottom surface of the housing recess 21 b and the inner extending portion 31 c of the collar 31. It is fixed so as to sandwich it. The oil supply member 36 is made of a material such as felt, urethane rubber, and opt sealer that has an elasticity and can be impregnated with a lubricating oil (similar to the lubricating oil impregnated in the bearing 24). The member 36 is also impregnated with the same lubricating oil as the lubricating oil impregnated in the. The oil supply member 36 is sandwiched between the inner extension portion 31c of the collar 31 and the base end side end surface 24a of the bearing 24 that supports the base end portion of the worm shaft 22, and the inner peripheral side of the oil supply member 36 is the same. The side surface is in contact with the base end side end surface 24 a in a pressed state, and the inner peripheral portion is pressed against and in contact with the base end outer peripheral surface of the worm shaft 22. In the state before assembly of the oil supply member 36 shown in FIG. 3B, the inner diameter D2 of the oil supply member 36 is set smaller than the outer diameter D1 of the base end outer peripheral surface of the worm shaft 22, and FIG. After the assembly shown, the inner peripheral portion of the oil supply member 36 is pressed against and comes into contact with the outer peripheral surface of the proximal end of the worm shaft 22.

  Here, there is a clearance between the inner peripheral surface of the bearing 24 and the outer peripheral surface of the worm shaft 22, and particularly in the case of this embodiment that is mounted on the resin gear housing 21, due to contraction during resin molding. When the roundness of the portion on which the bearing 24 is mounted tends to be low, and the amount of deformation of the mounted bearing 24 is relatively large, it is necessary to consider it in the clearance. Therefore, there is a concern that the worm shaft 22 is rattling (rough).

  Therefore, by bringing the oil supply member 36 into contact with the bearing 24, the lubricating oil that has oozed out from the bearing 24 is collected and supplied to the bearing 24, and the amount of lubricating oil in the bearing 24 is ensured. . As a result, it is possible to form a lubricating oil film that is stable in the clearance between the worm shaft 22 and the inner peripheral surface of the bearing 24, and rattling of the worm shaft 22 is suppressed.

  In addition, since the inner peripheral portion of the oil supply member 36 is pressed against the outer peripheral surface of the worm shaft 22, that is, with elasticity, this also suppresses the rattling of the worm shaft 22, and further increases the rattling. It has a configuration that can be suppressed. As a result, the motor 1 can be reduced in vibration and noise.

  Further, since the space on the bearing 24 side (worm shaft housing recess 21c) and the space on the clutch 4 side (clutch housing recess 21b) are partitioned by the oil supply member 36, the lubricating oil used for the bearing 24 and the lubricating oil used for the clutch 4 are separated. Interchange with (grease) is prevented, and the deterioration of the respective lubrication performance is also prevented. This also contributes to low vibration and low noise of the motor 1.

Next, characteristic effects of the present embodiment will be described.
(1) In the present embodiment, it is made of an elastic material that can be impregnated with lubricating oil, and contacts the axial end of the bearing (oil-impregnated bearing) 24 and the outer peripheral surface of the worm shaft 22. An oil supply member 36 that is in contact with the bearing 24 is provided and constitutes a bearing device together with the bearing 24. That is, when the oil supply member 36 abuts against the axial end of the bearing 24, the lubricating oil that has exuded from the bearing 24 is collected and supplied to the bearing 24, and the amount of lubricating oil in the bearing 24 is reduced. As a result, a stable lubricating oil film can be formed in the clearance between the worm shaft 22 and the inner peripheral surface of the bearing 24, and rattling of the worm shaft 22 is suppressed. Further, since the oil supply member 36 comes into contact with the outer peripheral surface of the worm shaft 22 with elasticity, rattling of the worm shaft 22 is suppressed, and rattling of the worm shaft 22 can be further suppressed. At this time, since the inner diameter D2 of the oil supply member 36 is set to be smaller than the outer diameter D1 of the worm shaft 22, the oil supply member 36 always contacts the outer peripheral surface of the worm shaft 22 with elasticity. The rattling can be reliably suppressed. As a result, the motor 1 can be reduced in vibration and noise.

  (2) In the present embodiment, the oil supply member 36 is sandwiched and fixed between the gear housing 21 and a collar 31 as a functional component that is mounted on the housing 21 and functions as a part of the clutch 4. That is, the oil supply member 36 can be easily fixed, and the collar 31 that functions as a part of the clutch 4 also functions as a fixing member that fixes the oil supply member 36. Therefore, the parts can be shared and the number of parts can be reduced. Is possible.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the oil supply member 36 is fixed by being sandwiched between the gear housing 21 (clutch housing recess 21b) and the collar 31, but the fixing mode is not limited to this. For example, a fixing member other than the collar 31 may be used. A fixing method other than clamping may be used.

  In the above embodiment, the inner diameter D2 of the oil supply member 36 is set smaller than the outer diameter D1 of the worm shaft 22 so that the oil supply member 36 always contacts the outer peripheral surface of the worm shaft 22 with elasticity. Also good.

In the above embodiment, the oil supply member 36 is brought into contact with only one end of the bearing 24 in the axial direction, but may be brought into contact with the outer peripheral surface of the bearing 24 and the other end in the axial direction.
-You may change suitably the structure of the motor 1 of the said embodiment. For example, it is good also as a structure which does not use the clutch 4. FIG. Moreover, although the motor 1 (motor main body 2) was comprised with the DC motor with a brush, a brushless motor etc. may be sufficient.

  -Although it applied with respect to the bearing apparatus in the motor 1 for power window apparatuses in the said embodiment, you may apply to the bearing apparatus of the motor used for others. Moreover, you may apply to bearing apparatuses other than a motor.

  DESCRIPTION OF SYMBOLS 2 ... Motor main body, 4 ... Clutch, 8 ... Motor shaft, 21 ... Gear housing (housing), 22 ... Worm shaft (rotation shaft, reduction mechanism), 23 ... Worm wheel (reduction mechanism), 24 ... Bearing (oil-impregnated bearing) , 24a: proximal end surface (axial end), 31: collar (functional part), 36: oil supply member, D1: outer diameter, D2: inner diameter.

Claims (4)

A bearing device for inserting and supporting a rotating shaft with an oil-impregnated bearing,
An oil supply that is made of a material that is elastic and can be impregnated with the lubricating oil, and that makes contact with the axial end of the oil-impregnated bearing and contact with the outer peripheral surface of the rotating shaft A member is provided ,
The oil supply member has an annular shape, the inner diameter is set smaller than the outer diameter of the rotating shaft,
The bearing is provided in a housing;
The oil supply member is fixed by being sandwiched between the housing and a fixing member attached to the housing,
The said fixing member is a functional component which has a function in addition to fixation of the said oil supply member, The bearing apparatus characterized by the above-mentioned. A motor comprising the bearing device according to claim 1, wherein the shaft is rotated and supported by a motor. The motor according to claim 2 ,
A motor main body that rotates the motor shaft, and a speed reduction mechanism that is drivingly connected to the motor shaft in a gear housing that is assembled with the motor main body;
A motor, wherein a worm shaft constituting the speed reduction mechanism is supported by the bearing, and the oil supply member is provided to the bearing and the worm shaft. The motor according to claim 3 , wherein
A clutch that is interposed between the motor shaft and the worm shaft, transmits a rotational force from the motor shaft side to the worm shaft side, and prevents rotation from the worm shaft side;
The oil supply member, a motor, characterized in that mounted on the housing and the housing is fixed sandwiched between the said functional component that serves as part of the clutch.

Images