JP2014129743A - Blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower in which a compression coil spring is assembled in a normal condition in a bearing liner, and which therefore enables the number of parts thereof to be reduced and enables contact of the bearing liner with the compression coil spring to be avoided.SOLUTION: A bearing of the blower includes: a first rolling bearing arranged between a shaft and the bearing liner on one end side of the shaft; a second rolling bearing arranged between the shaft and the bearing liner on the other end side of the shaft; and the compression coil spring arranged between the first rolling bearing and the second rolling bearing. In the inner periphery of the bearing liner, a projection part is formed against which an outer ring of the first rolling bearing is abutted and a first end part at one end of the compression coil spring is abutted. In the compression coil spring, a second end part at the other end of the compression coil spring is abutted against an outer ring of the second rolling bearing, and the outer diameter dimension of a body part between the first end part and the second end part is smaller than the outer diameter dimension of at least one of the first end part and the second end part.

Description

  The present invention relates to a blower, and more particularly to a blower including a constant pressure preload bearing between a shaft and a bearing liner.

  As a structure of the bearing of such a constant-pressure preload structure of an air blower, what was disclosed by the following patent documents 1, 2, 3, etc. is known, for example.

  In Patent Document 1, as shown in FIG. 6, the opposite ends of the pair of bearing outer rings 51 and 52 attached to the shaft 50 are respectively closely fitted to the end winding portions of the compression coil spring 55. There is disclosed a bearing device in which spring seats 53 and 54 having cylindrical fitting portions are mounted and a compression coil spring 55 is provided between the spring seats to apply a constant pressure preload to the bearing outer ring.

  In Patent Document 2, as shown in FIG. 7, seal plates 58 and 59 are provided on the side of each of the outer rings 56 </ b> B and 57 </ b> B of the pair of rolling bearings 56 and 57 attached to the shaft 50 that faces at least the other rolling bearing. An axial step portion is provided on the side of the seal plate facing the other rolling bearing or on the side of the outer ring facing the other rolling bearing, and the step portions are arranged at different positions in the radial direction. A bearing device is disclosed in which each step portion functions as a spring seat for positioning and fixing the end portion of the compression coil spring 55.

  In Patent Document 3, as shown in FIG. 8, a bearing 61 is clearance-fitted inside a lower end side of the bearing liner 60 in a bearing liner 60 in which a protruding portion 60 a protruding radially inward is formed on the inner peripheral side. Then, the upper surface of the bearing 61 is brought into contact with the lower surface of the projecting portion 60 a, the compression coil spring 55 is inserted from above the bearing liner 60 and brought into contact with the upper surface of the projecting portion 60 a, and the bearing 62 is moved to the upper end side of the bearing liner 60. After the shaft 50 communicating with the inner ring of each of the bearings 61 and 62 is fitted with a clearance ring 63 at the lower end of the shaft 50, the bearing 61, A structure for preloading 62 at a constant pressure is disclosed.

JP 2003-262221 A JP 2003-222126 A JP 2009-243381 A

  Here, in consideration of incorporating the bearing having the constant pressure preload structure shown in FIG. 6 into the bearing liner 60 shown in FIG. 8, the protrusion 60 a is provided on the inner peripheral surface of the bearing liner 60. The spring seat 53 needs to be fitted to the bearing 51 and the compression coil spring 55. Here, since the inside of the bearing liner 60 cannot be seen from the outside, the spring seat 53 and the bearing 51 and / or the compression coil spring 55 may be assembled in a state where they are not properly fitted. The inconvenience that an abnormal assembly cannot be detected occurs.

  In addition, since the spring seats 53 and 54 having cylindrical fitting portions are required to position the compression coil spring 55 in the radial direction, there is a disadvantage that the number of parts increases.

  On the other hand, when considering that the bearing of the constant pressure preload structure shown in FIG. 7 is incorporated in the bearing liner 60 shown in FIG. 8, the inside of the bearing liner 60 cannot be seen from the outside. , 59 may be assembled in a state that does not normally fit in the stepped portion of 59, and even in this case, there is a problem that an abnormality in the assembly cannot be detected.

  In the constant pressure preload structure shown in FIG. 8, since the compression coil spring 55 has a cylindrical shape with substantially the same outer diameter from one end to the other end, the compression coil spring 55 for constant pressure preloading of the 61 and 62 bearings is provided. In the compressed state, the compression coil spring 55 will bend. Since the clearance between the outer periphery of the compression coil spring 55 and the inner periphery of the bearing liner 60 is very small, the torsion of the compression coil spring 55 forms a portion in contact with the inner periphery of the bearing liner 60.

  Therefore, the bearing 62 vibrates in the direction in which the compression coil spring 55 is compressed due to vibration in the axial direction of the motor during rotation or vibration from the housing to which the motor is attached, and the inner peripheral surface of the bearing liner 60. And the compression coil spring 55 are rubbed against each other to cause noise. In particular, in a blower in which the rotor is made of metal, the mass of the rotor increases, and therefore the rotor is likely to move greatly in the axial direction due to vibration from the casing, and the noise is likely to occur.

  The present invention has been made in view of such circumstances, and the compression coil spring is assembled in the bearing liner in a normal state, so that the number of parts can be reduced and contact between the bearing liner and the compression coil spring is avoided. It is to provide a blower that can.

The present invention is grasped by the following composition.
(1) The blower of the present invention is a blower provided with a bearing of a constant pressure preload structure between a shaft and a bearing liner, and the bearing of the constant pressure preload structure is interposed between the bearing liner on one end side of the shaft. A clearance fit is provided between a first rolling bearing having an inner ring on the shaft side and an outer ring on the bearing liner side, and the bearing liner on the other end side of the shaft, and the inner ring and the shaft on the shaft side. A second rolling bearing having an outer ring on the bearing liner side, and a compression coil spring disposed between the first rolling bearing and the second rolling bearing, and the bearing liner has an inner circumference , The outer ring of the first rolling bearing is brought into contact with the first end of the compression coil spring, and a protruding portion is formed into contact with the first end of the compression coil spring. Two end portions are in contact with the outer ring of the second rolling bearing, and an outer diameter dimension of a body portion between the first end portion and the second end portion is set to the first end portion and the second end portion. It is characterized by being configured to be smaller than the outer diameter dimension of at least one of the portions.
(2) The blower of the present invention is characterized in that, in the configuration of (1), the compression coil spring is a drum-shaped coil spring.
(3) The blower of the present invention is characterized in that, in the configuration of (1), the outer diameter size of the second end portion of the compression coil spring is smaller than the outer diameter size of the first end portion.
(4) The blower of the present invention is characterized in that, in the configuration of (3), the compression coil spring is a conical coil spring.
(5) In the blower of the present invention, in any one of (1) to (4), the second end of the compression coil spring has an outer diameter that is greater than an outer diameter of the outer ring of the second rolling bearing. And the inner diameter is larger than the inner diameter of the outer ring of the second rolling bearing.

  According to the blower configured as described above, the compression coil spring is assembled in a normal state in the bearing liner, so that the number of parts can be reduced and contact between the bearing liner and the compression coil spring can be avoided.

It is sectional drawing which shows the structure in Embodiment 1 of the air blower of this invention. It is the exploded view which disassembled and showed the main components of the air blower of this invention. It is a block diagram which shows the principal part of Embodiment 1 of the air blower of this invention, and is sectional drawing which shows the vicinity of a compression coil spring. It is a block diagram which shows the principal part of Embodiment 2 of the air blower of this invention, and is sectional drawing which shows the vicinity of a compression coil spring. It is sectional drawing which shows the structure in other embodiment of the air blower of this invention. It is sectional drawing which shows the structure of the rolling bearing disclosed by patent document 1. FIG. It is sectional drawing which shows the structure of the rolling bearing disclosed by patent document 2. FIG. It is sectional drawing which shows the structure of the rolling bearing disclosed by patent document 3. FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.
(Embodiment 1)
FIG. 1 is a cross-sectional view illustrating a configuration of a blower according to a first embodiment of the present invention. FIG. 2 is an exploded view showing the main parts of the blower of the present invention in an exploded manner.

  In FIG. 1, the blower 10 has a cylindrical casing 11 made of, for example, a synthetic resin. The casing 11 is shown with its central axis aligned in the vertical direction in the figure.

  The casing 11 has a venturi portion 11a formed on the inner periphery thereof, and a motor base 11b formed integrally with the casing 11 at the center portion of the casing 11, for example.

  As shown in FIG. 2, the shaft 12 is attached to the motor base 11b with its center axis aligned with the vertical direction in the figure (the center axis direction of the casing 11). A cylindrical stator core 13 is attached to the motor base 11b so that the shaft 12 is positioned at the center, and a coil 14 is wound around the stator core 13.

  Further, there is a bearing liner 16 that is disposed through the shaft 12, and a cage rotor 20 is attached to the outer periphery of the bearing liner 16. A plurality of blades 22 are attached to the cage rotor 20 via a hub 21. Although not shown, these blades 22 extend radially from the hub 21 when viewed from the axial direction of the shaft 12, and their tips are arranged close to the venturi portion 11 a of the casing 11.

  The bearing liner 16 is arranged coaxially with the shaft 12, and has a space between the outer periphery of the shaft 12 and the inner periphery of the bearing liner 16, and a bearing 30 having a constant pressure preload structure is arranged in this space. It is like that.

  The bearing 30 of the constant pressure preload structure includes a first rolling bearing 31 disposed between the bearing liner 16 on one end side (lower side in the figure) of the shaft 12 and a bearing on the other end side (upper side in the figure) of the shaft 12. A second rolling bearing 32 disposed between the liner 16 and a compression coil spring 33 disposed between the first rolling bearing 31 and the second rolling bearing 32 is configured. .

  The first rolling bearing 31 includes an inner ring 31A disposed on the shaft 12 side via a ball 31C and an outer ring 31B disposed on the bearing liner 16 side. Similarly, the second rolling bearing 32 includes an inner ring 32A disposed on the shaft 12 side via a ball 32C and an outer ring 32B disposed on the bearing liner 16 side.

  The first rolling bearing 31 is inserted into the shaft 12, and the inner ring 31 </ b> A of the first rolling bearing 31 is loosely fitted to the shaft 12 at one end side (lower side in the figure) of the shaft 12. . Then, when the bearing liner 16 is inserted into the shaft 12, the outer ring 31 </ b> B of the first rolling bearing 31 is fitted into the bearing liner 16.

  Here, a retaining ring 34 is disposed at the root of the shaft 12 attached to the motor base 11b, and an inner ring 31A of the first rolling bearing 31 is in contact with the retaining ring 34.

  Further, a protruding portion 16A is formed along a circumferential direction on a part of the inner periphery of the bearing liner 16, and in a state where the bearing liner 16 is inserted through the shaft 12, the protruding portion 16A is formed in the first rolling bearing. 31 is abutted against the outer ring 31B.

  The compression coil spring 33 is inserted into the shaft 12 and is disposed in the bearing liner 16 between the first rolling bearing 31 and a second rolling bearing 32 described later. One end of the compression coil spring 33 (this specification) T1 (which may be referred to as a first end in the document) is adapted to abut on the protrusion 16A of the bearing liner 16. Accordingly, the first rolling bearing 31 is sandwiched between the retaining ring 34 and the protruding portion 16A in the axial direction. In FIG. 2, the protrusion 16A is integrated with the bearing liner 16. However, the protrusion 16A is not necessarily integrated. Even if another part is fixed to the inner periphery of the bearing liner 16, the protrusion 16A is formed. Good. For example, it is also possible to provide a circumferential groove on the inner periphery of the bearing liner 16 and fix the ring-shaped member to the circumferential groove to form the protrusion 16A.

  The compression coil spring 33 has an outer diameter dimension of the other end portion (which may be referred to as a second end portion in this specification) T2 that is substantially the same as an outer diameter dimension of the first end portion T1. The outer diameter dimension of the trunk | drum 33B between the edge part T1 and the 2nd edge part T2 is comprised smaller than the outer diameter dimension of the 1st edge part T1 and the 2nd edge part T2. In the case of FIGS. 1 and 2, the compression coil spring 33 has, for example, the smallest outer diameter at the center, and gradually increases toward the first end T1 and the second end T2. It is a drum-shaped coil spring.

  The second end T2 of the compression coil spring 33 inserted through the shaft 12 is brought into contact with a second rolling bearing 32 disposed between the other end side (upper side in the drawing) of the shaft 12 and the bearing liner 16. It is like that.

  That is, in the second rolling bearing 32, the inner ring 32A and the outer ring 32B are fitted into the shaft 12 and the bearing liner 16, respectively, and the second end T2 of the compression coil spring 33 is connected to the second rolling bearing 32. It comes in contact with the outer ring 32B.

  As a result, the compression coil spring 33 is arranged between the protrusion 16A of the bearing liner 16 and the second rolling bearing 32 so as to provide an urging force to the protrusion 16A and the second rolling bearing 32 side. ing.

  The inner ring 32 </ b> A of the second rolling bearing 32 comes into contact with a retaining ring 35 attached to the shaft 12 on the opposite side to the compression coil spring 33.

  Here, FIG. 3 is an enlarged sectional view showing the vicinity of the compression coil spring 33 of the blower 10 of the present invention. In FIG. 3, the outer diameter of the first end T1 and the second end T2 of the compression coil spring 33 is D1, and the body 33B of the compression coil spring 33 excluding the first end T1 and the second end T2. When the outer diameter dimension (the largest outer diameter dimension) is D2, the relation of D1> D2 is established.

  The outer diameter D1 of the first end T1 and the second end T2 of the compression coil spring 33 is smaller than the outer diameter of the outer rings 31B and 32B of the first rolling bearing 31 and the second rolling bearing 32, respectively. The inner diameter dimensions of the first end T1 and the second end T2 are larger than the inner diameter dimensions of the outer rings 31B and 32B of the first rolling bearing 31 and the second rolling bearing 32, respectively.

  In the blower 10 configured as described above, the second end T2 of the compression coil spring 33 is positioned in the radial direction by the inner peripheral surface of the bearing liner 16, and thus, for example, a cylindrical shape as shown in Patent Document 2 Even if the spring seat having the fitting portion is not used, the second end portion T2 of the compression coil spring 33 can be brought into contact with the end surface of the second rolling bearing 32.

  Further, since the outer diameter of the body portion 33B of the compression coil spring 33 is smaller than the outer diameters of the first end portion T1 and the second end portion T2, bending occurs in the body portion 33B in a state where the compression coil spring 33 is compressed. However, it is possible to avoid the body portion 33B from coming into contact with the inner peripheral surface of the bearing liner 16 and to prevent the generation of abnormal noise due to the contact.

The outer diameter of the second end T2 of the compression coil spring 33 is smaller than the outer diameter of the outer ring 32B of the second rolling bearing 32, and the inner diameter thereof is larger than the inner diameter of the outer ring 32B of the second rolling bearing 32. Is also formed large. Thereby, the compression coil spring 33 has an effect that the axial expansion and contraction can be smoothly performed between the shaft 12 and the bearing liner 16. In this case, if the outer diameter of the second end T2 of the compression coil spring 33 is larger than the outer diameter of the outer ring 32B of the second rolling bearing 32, the second end T2 fits into the bearing liner 16 and fits. As a result, the compression coil spring 33 does not function normally. Further, when the inner diameter dimension of the second end portion T2 is smaller than the inner diameter dimension of the outer ring 32B of the second rolling bearing 32, a portion that does not contact the end surface of the outer ring 32B of the compression coil spring 33 and the second rolling bearing 32 is formed. As a result, there is a risk that a uniform spring load cannot be applied to the outer ring 32B of the second rolling bearing 32.
(Embodiment 2)
FIG. 4 is a configuration diagram showing the main part of the second embodiment of the blower of the present invention, and a cross-sectional view showing the vicinity of the compression coil spring 33.

  In FIG. 4, the outer diameter dimensions of the body 33B and the second end T2 are smaller than the outer diameter dimensions of the first end T1 of the compression coil spring 33. That is, when the outer diameter of the first end T1 of the compression coil spring 33 is D1, the outer diameter of the body 33B is D2, and the outer diameter of the second end T2 is D3, D1> D2, D1 The relationship> D3 is established.

  The outer diameter D1 of the first end T1 and the outer diameter D3 of the second end T2 of the compression coil spring 33 are the outer diameters of the outer rings 31B and 32B of the first rolling bearing 31 and the second rolling bearing 32, respectively. The inner diameter dimension of the first end portion T1 and the second end portion T2 is smaller than the diameter dimension, and is larger than the inner diameter dimensions of the outer rings 31B and 32B of the first rolling bearing 31 and the second rolling bearing 32.

Even in this case, the same effects as those shown in the first embodiment can be obtained.
(Embodiment 3)
In any of the blowers in the above-described embodiments, the shaft 12 is fixed to the casing 11 and the cage rotor 20 is fixed to the bearing liner 16 side inserted through the shaft 12.

  However, the bearing liner 16 may be fixed to the casing 11 side, and the shaft 12 may be fixed to the cage rotor 20 side.

  As shown in FIG. 5, the bearing liner 16 is attached to a motor base 11 b fixed to the casing 11, and the shaft 12 is attached to a rotor 23 that fixes a blade 22 via a hub 21. ing.

  In FIG. 5, the protrusion 16A formed on the inner periphery of the bearing liner 16 is formed relatively long along the axial direction of the bearing liner 16. However, the protrusion 16A is formed in this way. It goes without saying.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Blower, 11 ... Casing, 11a ... Venturi part, 11b ... Motor base, 12 ... Shaft, 13 ... Stator core, 14 ... Coil,
16 ... Bearing liner, 16A ... Projection, 20 ... Cage rotor, 21 ... Hub, 22 ... Blade, 23 ... Rotor, 30 ... Bearing with constant pressure preload, 31 ... First Rolling bearing, 31A ... Inner ring, 31B ... Outer ring, 31C ... Ball, 32 ... Second rolling bearing, 32A ... Inner ring, 32B ... Outer ring, 32C ... Ball, 33 ... Compression coil spring, 33B ... ... barrel, 34, 35 ... retaining ring, 50 ... shaft, 51, 52 ... bearing outer ring, 53, 54 ... spring seat, 55 ... compression coil spring, 56, 57 ... rolling bearing, 56B, 57B: Outer ring, 58, 59 ... Seal plate, 60 ... Bearing liner, 60a ... Projection, 61, 62 ... Bearing, 63 ... Retaining ring.

Claims (5)

A blower including a bearing having a constant pressure preload structure between a shaft and a bearing liner,
The bearing of the constant pressure preload structure is
A first rolling bearing having an inner ring on the shaft side and an outer ring on the bearing liner side; and a bearing liner on the other end side of the shaft; A second rolling bearing having an inner ring on the shaft side and an outer ring on the bearing liner side, and a compression coil spring disposed between the first rolling bearing and the second rolling bearing; Have
The bearing liner has, on its inner periphery, a protrusion is formed on which the outer ring of the first rolling bearing abuts and a first end of one end of the compression coil spring abuts.
In the compression coil spring, the second end portion of the other end is brought into contact with the outer ring of the second rolling bearing, and the outer diameter dimension of the body portion between the first end portion and the second end portion is set. A blower characterized in that it is configured to be smaller than the outer diameter of at least one of the first end and the second end.   The blower according to claim 1, wherein the compression coil spring is a drum-shaped coil spring.   The blower according to claim 1, wherein an outer diameter size of the second end portion of the compression coil spring is smaller than an outer diameter size of the first end portion.   The blower according to claim 3, wherein the compression coil spring is a conical coil spring. The outer diameter of the second end of the compression coil spring is smaller than the outer diameter of the outer ring of the second rolling bearing, and the inner diameter is larger than the inner diameter of the outer ring of the second rolling bearing. The blower according to any one of claims 1 to 4, wherein:

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