Blower

Abstract

This blower comprises a housing (10), a sleeve (20), a first cap (30), a plate (50), a shaft (9), and a propeller. The housing (10) has an upwardly open recess. The sleeve (20) is disposed inside the recess and has a first through-hole (21). The first cap (30) is attached to the housing (10) so as to cover the recess, and has a second through-hole (33). The plate (50) is disposed inside the cap (30) and has a third through-hole. The shaft (9) is inserted into the first through-hole (21), the second through-hole (33), and the third through-hole. The propeller is connected to an end section of the shaft (9). The shaft (9) has a depression (8). At least a portion of the inner peripheral surface of the third through-hole of the plate (50) is positioned inside the depression (8) of the shaft (9). In a top view, the second through-hole (33) of the first cap (30) is positioned inside the outer periphery of the plate (50).

Description

blower

[0001] The present disclosure relates generally to blowers, and more particularly to blowers with propellers.

[0002] Patent Document 1 discloses a fan motor (blower) as an example. The fan motor disclosed in Patent Document 1 includes a housing, a stator, a rotor, two bearings, and a retaining member. The rotor has a rotating shaft and a plurality of blades. The retaining member is disposed between the two bearings. The retaining member also has a base, an extension, an engagement portion, and a corner portion. One of the two bearings is provided with an abutment portion that abuts against the corner portion of the retaining member.

[0003] JP 2011-214470 A

[0004] In the fan motor described in Patent Document 1, for example, when a strong external impact is applied, a retaining member prevents the rotating shaft from coming loose, but the structure of the retaining member is complex.

[0005] An object of the present disclosure is to provide a blower that suppresses shaft disengagement with a simpler configuration.

[0006] A blower according to one aspect of the present disclosure includes a housing, a sleeve, a first cap, a plate, a shaft, and a propeller. The housing has a recess that opens upward. The sleeve is disposed within the recess and has a first through hole. The first cap is attached to the housing so as to cover the recess and has a second through hole. The plate is disposed within the first cap and has a third through hole. The shaft is inserted through the first through hole of the sleeve, the second through hole of the cap, and the third through hole of the plate. The propeller is connected to an upper end of the shaft. The shaft has a recess. At least a portion of the inner circumferential surface of the third through hole in the plate is located within the recess of the shaft. In a top view, the second through hole of the first cap is located inside the outer periphery of the plate.

[0007] According to the blower according to one aspect of the present disclosure, shaft removal is suppressed with a simpler configuration.

[0008] FIG. 1 is a perspective view of a blower according to a first embodiment. FIG. 2 is a cross-sectional view of the blower. FIG. 3 is an exploded perspective view of a bearing portion of the blower. FIG. 4 is a cross-sectional view of the bearing portion of the blower. FIG. 5A is a cross-sectional view of a main portion of the bearing portion of the blower. FIG. 5B is an enlarged view of a main portion of FIG. 5A. FIG. 6 is a perspective view of a first cap of the blower. FIG. 7 is a perspective view of a second cap of the blower. FIG. 8 is a perspective view of a plate of the blower. FIG. 9A is an explanatory view of the bearing portion of the blower when inserting a shaft into a sleeve. FIG. 9B is another explanatory view of the bearing portion of the blower when inserting a shaft into a sleeve. FIG. 9C is yet another explanatory view of the bearing portion of the blower when inserting a shaft into a sleeve. FIG. 10 is a perspective view of a plate of a blower according to a modified example. FIG. 11 is a perspective view of a plate of another modified example. Fig. 12 is a perspective view of a plate of a blower according to yet another modification of the above embodiment. Fig. 13 is a cross-sectional view of a main part of a bearing portion of a blower according to embodiment 2. Fig. 14 is a perspective view of a first cap of the above blower. Fig. 15 is a perspective view of a plate of the above blower. Fig. 16 is a cross-sectional view of a modification of the bearing portion shown in Fig. 4.

[0009] Below, fans according to the first and second embodiments will be described with reference to the drawings. The figures described in the following embodiments are schematic diagrams, and the size and thickness ratios of the components do not necessarily reflect actual dimensional ratios. Furthermore, the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved. In the following description, unless otherwise specified, the first direction D1, second direction D2, and third direction D3 indicated by arrows in the drawings are defined as the up-down direction, left-right direction, and front-rear direction of the fan A1 of the first and second embodiments. However, the up-down direction, left-right direction, and front-rear direction are used for convenience to facilitate understanding of the embodiments, and do not define the directions when the fan A1 is used. Furthermore, the arrows "D1," "D2," and "D3" in the drawings are merely shown for explanatory purposes and do not have any physical substance.

[0010] (Embodiment 1) (1) Blower A blower A1 according to embodiment 1 will be described below with reference to FIGS. 1 to 9C. As shown in FIG. 1, the blower A1 includes a frame 90, a rotor unit 80, a stator unit 70 (see FIG. 2), and a bearing unit 60 (see FIG. 2). The blower A1 is, for example, a cooling fan. Note that FIG. 2 shows a cross-sectional view taken along line X-X in FIG. 1. Furthermore, FIG. 4 shows a cross-sectional view taken along line Y-Y in FIG. 3.

[0011] (2) Components of the Blower (2.1) Frame The frame 90 houses the rotor unit 80, the stator unit 70, and the bearing unit 60. As shown in FIG. 1 , the frame 90 has a main body 91, a base 92, and multiple beams 93 (only two are shown in FIG. 1 ). As shown in FIG. 1 , the main body 91 is, for example, cylindrical (e.g., rectangular cylindrical) and has an opening 91a. The main body 91 is made of, for example, resin. The opening 91a penetrates the main body 91 in the vertical direction (first direction D1). The opening 91a is, for example, circular when viewed from the vertical direction of the main body 91. The base 92 holds the rotor unit 80, the stator unit 70, and the bearing unit 60. The base 92 is, for example, cylindrical with a bottom. The base 92 is, for example, resin. The base 92 is disposed in the center of the opening 91 a of the main body 91. Each beam 93 connects the main body 91 and the base 92. Each beam 93 is, for example, rod-shaped (e.g., square rod-shaped). The material of each beam 93 is, for example, resin. A first end of each beam 93 is connected to the inner circumferential surface of the opening 91 a in the main body 91. A second end of each beam 93 is connected to the outer circumferential surface of the base 92. The multiple beams 93 are disposed radially from the center of the opening 91 a of the main body 91.

[0012] (2.2) Rotor Section As shown in FIG. 2 , the rotor section 80 includes a propeller 81, a yoke 84, and a magnet 85. The propeller 81 includes a main body section 82 and a plurality of blades 83. The main body section 82 is, for example, a cylindrical shape with a bottom. In this embodiment, the main body section 82 has an upper plate 82a at its top and is a cylindrical shape with a bottom that is open downward. The main body section 82 is made of, for example, resin. The plurality of blades 83 are attached to the main body section 82 so as to extend outward from the outer circumferential surface of the main body section 82. Each blade 83 is made of, for example, resin. A first end (upper end) of the shaft 9 (described below) is fixed to the center of the upper plate 82a of the main body section 82. The yoke 84 is, for example, a cylindrical shape. The outer diameter of the yoke 84 is smaller than the inner diameter of the main body section 82 of the propeller 81. The yoke 84 is disposed inside the main body 82 along the inner circumferential surface of the main body 82. The magnet 85 is, for example, tubular (e.g., cylindrical). The outer diameter of the magnet 85 is smaller than the inner diameter of the yoke 84. The magnet 85 is disposed inside the yoke 84 along the inner circumferential surface of the yoke 84.

[0013] (2.3) Stator Section The stator section 70 generates magnetic flux in response to, for example, a current (drive current). As shown in FIG. 2 , the stator section 70 includes a core 71, a plurality of coils 72 (only two are shown in FIG. 2 ), and a circuit board 73. The core 71 is formed of a laminated steel plate in which electromagnetic steel plates, such as silicon steel plates, are stacked in the vertical direction (first direction D1) of the stator section 70. The core 71 includes a main body section 75 and a plurality of teeth 74 (only two are shown in FIG. 2 ). The main body section 75 is, for example, cylindrical (e.g., cylindrical). The plurality of teeth 74 are, for example, plate-shaped (e.g., rectangular). The plurality of teeth 74 protrude outward from the outer circumferential surface of the main body section 75. The plurality of teeth 74 are arranged at equal intervals around the circumferential direction of the main body section 75. The core 71 is disposed on one surface (top surface) of the circuit board 73. The core 71 is disposed inside the magnet 85 of the rotor unit 80. Each coil 72 is, for example, an assembly of wound conductor wires. Each coil 72 is attached to each tooth 74. Each coil 72 is electrically connected to the circuit board 73. The circuit board 73 is configured to pass a current through each coil 72.

[0014] (2.4) Bearing Unit As shown in FIG. 2, the bearing unit 60 rotatably supports the shaft 9 fixed to the main body 82 of the propeller 81. As shown in FIG. 3, the bearing unit 60 has a housing 10, a sleeve 20, a first cap 30, a second cap 40, a plate 50, the shaft 9, and the lubricating oil 7 (see FIG. 4). Note that the dotted hatching in FIGS. 4, 5, and 9A to 9C does not indicate a cross section of the lubricating oil 7. Furthermore, because the lubricating oil 7 is colorless and transparent or colored and transparent in FIGS. 4, 5, and 9A to 9C, the rear components are shown through the lubricating oil 7.

[0015] (2.4.1) Housing As shown in FIG. 4 , the housing 10 houses the sleeve 20, the second cap 40, and a portion of the shaft 9. The housing 10 has a base 11 and a tubular portion 12. The base 11 is, for example, plate-shaped (e.g., flat). The base 11 is made of, for example, a metal (e.g., an aluminum alloy). The tubular portion 12 is, for example, tubular (e.g., cylindrical). The tubular portion 12 is made of, for example, a metal. The tubular portion 12 is disposed in the center of one surface (top surface) of the base 11. The base 11 and the tubular portion 12 are, for example, formed as a continuous, integrated unit. That is, the housing 10 is formed in a cylindrical shape with a bottom, and the interior of the tubular portion 12 is a recess 13. In other words, the housing 10 has the recess 13 that opens upward. A groove 14 (see FIG. 3 ) is provided on the inner peripheral surface of the recess 13 in the housing 10 along the vertical direction (first direction D1) of the housing 10. A recess 15 (see FIG. 4 ) is provided in the center of the base 11. In other words, the recess 15 is provided in the center of the inner bottom surface of the recess 13. The recess 15 accommodates a receiving plate 16. The recess 15 is, for example, circular when viewed from above in the vertical direction of the housing 10. The receiving plate 16 is configured to receive the second end (lower end) of the shaft 9. The receiving plate 16 is, for example, plate-shaped (e.g., disc-shaped). The material of the receiving plate 16 is, for example, resin. The outer diameter of the receiving plate 16 is smaller than the inner diameter of the recess 15.

[0016] (2.4.2) Sleeve The sleeve 20 rotatably supports the shaft 9. As shown in FIG. 4 , the sleeve 20 is disposed in the recess 13 of the housing 10. The sleeve 20 is, for example, tubular (e.g., cylindrical) and has a first through hole 21. The sleeve 20 is made of, for example, metal. The first through hole 21 penetrates the sleeve 20 in the up-down direction (first direction D1). The shaft 9 is inserted through the first through hole 21. When viewed from the up-down direction of the sleeve 20, the first through hole 21 is, for example, circular. A protrusion 22 that protrudes upward is provided around the first through hole 21 at one end (upper end) of the sleeve 20. The protrusion 22 is, for example, tapered so that it narrows upward.

[0017] (2.4.3) First Cap As shown in FIG. 4 , the first cap 30 is attached to the housing 10 so as to cover the recess 13 of the housing 10. The first cap 30 is positioned higher than the sleeve 20 (see A in FIG. 5 ). As shown in FIG. 6 , the first cap 30 has an upper plate 31, a side plate 32, and a second through hole 33. The upper plate 31 is, for example, plate-shaped (e.g., disc-shaped). The upper plate 31 is made of, for example, metal. A second through hole 33 is provided in the center of the upper plate 31. The second through hole 33 penetrates the upper plate 31 in the up-down direction (first direction D1). The shaft 9 is inserted through the second through hole 33. The second through hole 33 is, for example, circular when viewed from the up-down direction (first direction D1) of the first cap 30. The diameter of the second through hole 33 is larger than the diameter of the first through hole 21 of the sleeve 20, as shown in A in FIG. 5 .

[0018] The side plate 32 is, for example, tubular (e.g., cylindrical). The material of the side plate 32 is, for example, metal. The side plate 32 is connected to the upper plate 31 so as to protrude downward from the peripheral portion of one surface (lower surface) of the upper plate 31. In other words, a first end (upper end) of the side plate 32 is connected to the peripheral portion of the lower surface of the upper plate 31. Furthermore, as shown in FIG. 5A , the side plate 32 surrounds the outer peripheral surface 52 of the plate 50. In this embodiment, the upper plate 31 and the side plate 32 are configured as a continuous, integrated unit. A second end (lower end) 34 of the side plate 32 is provided with a notch 37 through which a protrusion 46 (described later) of the second cap 40 is guided. The side plate 32 includes a protrusion 35 that protrudes toward the central axis of the second through hole 33. In other words, the side plate 32 includes a protrusion 35 that protrudes toward the shaft 9. The protrusion 35 is provided, for example, around the entire periphery of the side plate 32. The protrusions 35 are provided on the side plates 32 so as to determine the position of the plate 50 in the up-down direction (first direction D1). In short, the protrusions 35 have a function of positioning the plate 50. The positioning function of the protrusions 35 will be described later.

[0019] (2.4.4) Second Cap As shown in Fig. 7 , the second cap 40 has a main body 41, a flange 42, a fourth through-hole 43, a fifth through-hole 44, and a protrusion 46. As shown in Fig. 5A, the second cap 40 is disposed above the sleeve 20. More specifically, the second cap 40 is disposed so as to overlap the protrusion 22 and one end surface (upper end surface) of the sleeve 20. The second cap 40 is also disposed below the first cap 30. The second cap 40 is also disposed below a plate 50, which will be described later.

[0020] As shown in FIG. 7 , the main body 41 includes an upper plate 48 and a side plate 49. The upper plate 48 is, for example, plate-shaped (e.g., disc-shaped). The upper plate 48 is made of, for example, metal. A fourth through hole 43 is provided in the center of the upper plate 48. The fourth through hole 43 penetrates the upper plate 48 in the up-down direction (first direction D1). The shaft 9 is inserted through the fourth through hole 43. The fourth through hole 43 is, for example, circular when viewed from the up-down direction of the upper plate 48. As shown in FIG. 5A , the diameter of the fourth through hole 43 is larger than the diameter of the first through hole 21 of the sleeve 20. Furthermore, the diameter of the fourth through hole 43 is smaller than the diameter of the second through hole 33 of the first cap 30. One fifth through hole 44 is provided in the periphery of the upper plate 48. More specifically, the fifth through hole 44 is provided in the peripheral portion of the upper plate 48 so as to be located above the lower end 34 of the side plate 32 of the first cap 30. The fifth through hole 44 penetrates the upper plate 48 in the vertical direction. The fifth through hole 44 allows ventilation. In other words, the fifth through hole 44 is a ventilation hole. The fifth through hole 44 has, for example, a semicircular shape when viewed from the vertical direction of the upper plate 48 (see FIG. 7 ). In this embodiment, the fifth through hole 44 is connected to the fourth through hole 43. The side plate 49 has, for example, a cylindrical shape and a tapered shape. More specifically, the side plate 49 has, for example, a cylindrical shape and a tapered shape that narrows toward the top. The material of the side plate 49 is, for example, metal. A first end (upper end) of the side plate 49 is connected to the outer circumferential edge of the upper plate 48.

[0021] The flange 42 protrudes outward from the second end (lower end) of the side plate 49 of the main body 41. The flange 42 is, for example, annular (e.g., circular). The flange 42 is made of, for example, metal. When the first cap 30 is attached to the housing 10, the flange 42 is sandwiched between the lower end 34 of the side plate 32 of the first cap 30 and the upper end surface of the sleeve 20 (see A in FIG. 5 ). The flange 42 includes multiple (four in the example in FIG. 7 ) notches 45 and a protrusion 46. The multiple notches 45 are provided on the outer circumferential edge of the flange 42. The multiple notches 45 are, for example, equally spaced around the circumference of the flange 42. Each notch 45 is, for example, arc-shaped when viewed from the vertical direction (first direction D1) of the flange 42. A protrusion 46 is provided on the outer peripheral edge of the flange 42. The protrusion 46 is provided on the outer peripheral edge of the flange 42 so as to form a space 100 (see A in FIG. 5 ) between the protrusion 46 and the sleeve 20. A slit 47 (see FIG. 7 ) is provided on the outer peripheral edge of the flange 42. The slit 47 penetrates the second cap 40 in the up-down direction (first direction D1). The slit 47 is, for example, U-shaped when viewed from the up-down direction of the second cap 40. In this embodiment, the main body 41 and the flange 42 are configured as a continuous, integrated unit.

[0022] (2.4.5) Plate As shown in FIG. 8 , the plate 50 is, for example, plate-shaped (e.g., disc-shaped). The material of the plate 50 is, for example, resin. As shown in FIG. 5A , the plate 50 is disposed within the first cap 30. More specifically, the plate 50 is disposed within the first cap 30 so as to be positioned between the upper plate 31 and the protruding portion 35 of the first cap 30. As shown in FIG. 8 , the plate 50 has a third through hole 51 and multiple (four in the example of FIG. 8 ) hook portions 53. The third through hole 51 penetrates the plate 50 in the up-down direction. The shaft 9 is inserted through the third through hole 51. The multiple hook portions 53 are provided on the inner circumferential surface 51 a of the third through hole 51 in the plate 50 so as to protrude toward the central axis of the plate 50. Each hook portion 53 is, for example, plate-shaped and tapered. More specifically, each hook portion 53 is, for example, flat and tapered toward the central axis of the plate 50. The tip of each hook portion 53 is, for example, arc-shaped along the outer circumferential surface of the shaft 9.

[0023] The outer diameter of the plate 50 is larger than, for example, the diameter of the second through-hole 33 in the upper plate 31 of the first cap 30. In other words, the second through-hole 33 in the first cap 30 is located inside the outer periphery of the plate 50 when viewed from above in the vertical direction of the first cap 30 (top view). The outer periphery 52 of the plate 50 contacts the inner periphery 38 of the first cap 30 (see A in FIG. 5). In other words, the outer periphery 52 of the plate 50 contacts the inner periphery 38 of the side plate 32 of the first cap 30. For example, when the plate 50 is removed from the first cap 30, the outer diameter of the plate 50 is larger than the inner diameter W1 of the first cap 30 (see A in FIG. 5). In other words, when the plate 50 is placed in the first cap 30, the plate 50 is press-fit into the first cap 30 by utilizing the elastic deformation of the plate 50. In other words, the plate 50 is disposed within the first cap 30 with the first cap 30 and the plate 50 pressing against each other.

[0024] (2.4.6) Shaft As shown in FIG. 3 , the shaft 9 is rod-shaped (e.g., round rod-shaped). The shaft 9 is made of, for example, metal. The shaft 9 is inserted through the first through-hole 21 of the sleeve 20, the second through-hole 33 of the first cap 30, the fourth through-hole 43 of the second cap 40, and the third through-hole 51 of the plate 50 (see FIG. 4 ). The upper end of the shaft 9 is fixed to the main body 82 of the propeller 81 (see FIG. 2 ). In other words, the propeller 81 is connected to the upper end of the shaft 9. The lower end of the shaft 9 is, for example, spherical, as shown in FIG. 4 . When the shaft 9 is inserted into the first through-hole 21 of the sleeve 20, the lower end of the shaft 9 comes into contact with the receiving plate 16 housed in the recess 15 of the housing 10.

[0025] The shaft 9 has a recess 8. More specifically, the shaft 9 has the recess 8 on its outer circumferential surface. The recess 8 is provided, for example, around the entire circumference of the shaft 9. The recess 8 is also provided on the outer circumferential surface of the shaft 9 so that, when the shaft 9 is inserted into the first through-hole 21 of the sleeve 20, the tip of each hook portion 53 of the plate 50 is positioned within the recess 8 (see FIGS. 4 and 5 ). In other words, the recess 8 is provided on the outer circumferential surface of the shaft 9 so that, when the shaft 9 is inserted into the first through-hole 21 of the sleeve 20, the distance W2 (see B in FIG. 5 ) between the tip of each hook portion 53 and the inner bottom surface of the recess 8 of the shaft 9 is smaller than the depth W3 of the recess 8. In other words, the hook portions 53 of the plate 50 are positioned within the recess 8 of the shaft 9. That is, each hook portion 53 of the plate 50 is positioned within the recess 8 of the shaft 9 so that the distance W2 between the tip of each hook portion 53 and the inner bottom surface of the recess 8 of the shaft 9 is smaller than the depth W3 of the recess 8. In other words, at least a portion of the inner circumferential surface 51 a of the third through hole 51 in the plate 50 is positioned within the recess 8 of the shaft 9. As a result, in the blower A1, even if the shaft 9 moves in the up-down direction (first direction D1) during rotation of the shaft 9 due to, for example, an unexpectedly large force (external force), the tip of each hook portion 53 of the plate 50 comes into contact with the recess 8 of the shaft 9, thereby preventing the shaft 9 from coming out. Note that the tip of each hook portion 53 may also come into contact with the inner bottom surface of the recess 8 of the shaft 9.

[0026] On the other hand, the fan motor described in Patent Document 1 uses a retaining member to prevent the rotating shaft from coming loose when, for example, a strong external impact is applied, but the retaining member has a complex configuration. However, in the blower A1 of this embodiment, even when the shaft 9 moves up and down, the tips of the hooks 53 of the plate 50 contact the recesses 8 of the shaft 9, thereby preventing the shaft 9 from coming loose with a simpler configuration than the fan motor described in Patent Document 1. Therefore, the blower A1 of this embodiment prevents the shaft 9 from coming loose with a simpler configuration. Furthermore, because the plate 50 of the blower A1 has a simple configuration, the shaft 9 can be inserted into the third through-hole 51 of the plate 50 from either the up or down direction (first direction D1) of the third through-hole 51. Therefore, the blower A1 of this embodiment is easier to assemble than the fan motor described in Patent Document 1. During assembly of the bearing portion 60, the mounting direction of the plate 50 to the first cap 30 is not limited, making assembly easier.

[0027] The width H2 (see A in FIG. 5) of the recess 8 in the axial direction (first direction D1) of the shaft 9 is greater than the thickness H1 of the plate 50.

[0028] (2.4.7) Lubricating Oil As shown in FIG. 4 , the lubricating oil 7 is filled in the recess 13 of the housing 10. Specifically, the lubricating oil 7 is filled between the inner circumferential surface of the first through hole 21 in the sleeve 20 and the outer circumferential surface of the shaft 9 (first gap). The lubricating oil 7 is also filled between the inner bottom surface of the recess 13 in the housing 10 and one surface (lower surface) of the sleeve 20 (second gap). The lubricating oil 7 is also filled between the inner circumferential surfaces of the recess 13 and groove 14 of the housing 10 and the outer circumferential surface of the sleeve 20 (third gap). The lubricating oil 7 is also filled between the sleeve 20 and the second cap 40 (fourth gap). The lubricating oil 7 is also filled between the plate 50, the first cap 30, and the second cap 40. More specifically, the lubricating oil 7 is filled between the first surface (lower surface) of the plate 50 , the inner surface of the protrusion 35 of the first cap 30 , and one surface (upper surface) of the second cap 40 .

[0029] Incidentally, a plurality of guide grooves 23 (see FIG. 3 ) are provided on the inner circumferential surface of the first through hole 21 in the sleeve 20. The plurality of guide grooves 23 are configured to circulate the lubricating oil 7 within the recess 13 of the housing 10 when the shaft 9 rotates. The plurality of guide grooves 23 are also configured to increase the dynamic pressure of the lubricating oil 7 and maintain a non-contact state between the shaft 9 and the sleeve 20. The plurality of guide grooves 23 are arranged at predetermined intervals in the circumferential direction of the sleeve 20. In short, the sleeve 20 includes the plurality of guide grooves 23 and has the function of circulating the lubricating oil 7 within the recess 13 of the housing 10.

[0030] In the blower A1 of this embodiment, when the shaft 9 rotates, a driving force acts on the lubricating oil 7 filled in the first gap due to the guide grooves 23 of the sleeve 20, causing the lubricating oil 7 to flow downward (toward the inner bottom surface of the recess 13 of the housing 10). The downward-flowing lubricating oil 7 flows through the second gap, the third gap, the fourth gap, and the first gap while the shaft 9 continues to rotate, circulating within the recess 13 of the housing 10. As a result, in the blower A1, for example, if the lubricating oil 7 contains air bubbles, the lubricating oil 7 circulates within the recess 13 of the housing 10, thereby reducing the retention of the air bubbles in the gaps. Therefore, in the blower A1, it is possible to release the air bubbles from, for example, the fifth through-hole 44, the notches 45, and the slits 47 of the second cap 40, thereby reducing contact between the shaft 9 and the sleeve 20 caused by the air bubbles and preventing the shaft 9 and the sleeve 20 from seizing.

[0031] As shown in A of FIG. 5 , the lubricating oil 7 is filled in the recess 13 of the housing 10 so that the level of the lubricating oil 7 is located above the lower end 34 of the side plate 32 of the first cap 30 and below the upper surface of the plate 50. In other words, the lubricating oil 7 is in contact with the plate 50. In this embodiment, the lubricating oil 7 is filled up to the level of the lower surface of the plate 50, for example. As described above, the protrusion 35 of the first cap 30 has a positioning function for the plate 50. The protrusion 35 positions the plate 50 so that the minimum required amount of lubricating oil 7 is provided. In other words, the first cap 30 positions the plate 50 so that the minimum required amount of lubricating oil 7 is provided. In other words, the plate 50 is positioned at a position where the minimum amount of lubricating oil 7 is required, and if the level of the lubricating oil 7 is lower than the lower surface of the plate 50, this indicates that there is not enough lubricating oil 7. Furthermore, the protrusions 35 are provided on the side plate 32 so that, for example, when the shaft 9 is inserted through the third through-hole 51 of the plate 50 and the tips of the hooks 53 are bent downwardly of the plate 50, the hooks 53 do not interfere with the second cap 40 (see FIGS. 9A and 9B). That is, the position of the protrusions 35 is determined taking into consideration, for example, the bending of the hooks 53 of the plate 50 when the shaft 9 is inserted (see FIGS. 9A to 9C).

[0032] A space 101 (see A in FIG. 5 ) formed between the lower surface of the upper plate 31 of the first cap 30, the inner peripheral surface of the side plate 32 of the first cap 30, and the second surface (upper surface) of the plate 50 is a space that collects the leaked lubricating oil 7, for example, when the lubricating oil 7 leaks from the third through-hole 51 of the plate 50. As a result, in the blower A1, for example, when the shaft 9 is inserted into the first through-hole 21 of the sleeve 20, even if the lubricating oil 7 leaks from the third through-hole 51 of the plate 50, the lubricating oil 7 can be prevented from leaking from the bearing portion 60.

[0033] In the blower A1 of this embodiment, the lubricating oil 7 is filled up to the level of the underside of the plate 50, that is, the liquid surface of the lubricating oil 7 is in contact with the underside of the plate 50, so that the area (contact area) of the lubricating oil 7 that comes into contact with the air can be reduced. Therefore, in the blower A1, for example, when the temperature of the lubricating oil 7 becomes high due to the usage environment of the blower A1, it is possible to reduce evaporation of the lubricating oil 7, and the evaporation loss of the lubricating oil 7 is reduced compared to when the plate 50 is not provided.

[0034] (3) Assembly Procedure of Bearing Portion The assembly procedure of the bearing portion 60 will be described below with reference to Figures 3 to 5. Note that the assembly procedure described below is an example, and the order of some steps may be reversed.

[0035] First, the worker performing the assembly work fills the recess 13 of the housing 10 with the lubricating oil 7, then inserts the sleeve 20 into the recess 13 and positions the second cap 40 above the sleeve 20 so that the second cap 40 overlaps the protruding portion 22 and the upper end surface of the sleeve 20. Next, the worker fits the plate 50 into the first cap 30 using the plate 50's elastic deformation, and presses the lower end 34 of the side plate 32 of the first cap 30 into the recess 13 of the housing 10. Then, the worker uses, for example, a tool to crimp one end (upper end) 12a (see FIG. 5A ) of the cylindrical portion 12 of the housing 10 toward the outer circumferential surface of the protruding portion 35 of the first cap 30 (the constriction 35a of the protruding portion 35), thereby attaching the first cap 30 to the housing 10. Finally, the worker inserts the shaft 9 through the second through-hole 33 of the first cap 30, the third through-hole 51 of the plate 50, and the fourth through-hole 43 of the second cap 40, and then inserts it into the first through-hole 21 of the sleeve 20 (see FIGS. 9A to 9C). This completes the assembly of the bearing 60. After inserting the sleeve 20 into the recess 13, the recess 13 of the housing 10 (the first through-hole 21 of the sleeve 20) may be filled with lubricating oil 7.

[0036] (4) Effect In the fan A1, at least a portion of the inner circumferential surface 51a of the third through-hole 51 in the plate 50 is located within the recess 8 of the shaft 9. Therefore, in the fan A1, even if the shaft 9 moves up and down during rotation due to, for example, an unexpectedly large external force, the shaft 9 is prevented from coming loose. Therefore, the fan A1 has a simpler configuration and prevents the shaft 9 from coming loose.

[0037] Furthermore, in the fan A1, the recess 8 in the shaft 9 is provided around the entire circumference of the shaft 9, which further prevents the shaft 9 from coming loose even if the shaft 9 moves up or down due to, for example, an unexpectedly large external force. Therefore, the fan A1 has a simpler configuration and further prevents the shaft 9 from coming loose.

[0038] Furthermore, in blower A1, plate 50 has a plurality of hook portions 53. Therefore, in blower A1, even if shaft 9 moves up or down due to an unexpectedly large external force, the tips of each hook portion 53 of plate 50 come into contact with recess 8 of shaft 9, further preventing shaft 9 from coming loose. Therefore, blower A1 further prevents shaft 9 from coming loose with a simpler configuration.

[0039] Furthermore, in blower A1, the outer peripheral surface 52 of plate 50 (see A in FIG. 5 ) contacts the inner peripheral surface 38 of first cap 30. Therefore, in blower A1, the contact resistance between outer peripheral surface 52 of plate 50 and inner peripheral surface 38 of first cap 30 is greater than the contact resistance (comparison contact resistance) between the inner bottom surface of recess 8 of shaft 9 and the tip surfaces of each hook portion 53 of plate 50. Therefore, in blower A1, it is possible to prevent the shaft 9 and plate 50 from rotating together (co-rotating), and, for example, the lubricating oil 7 is not agitated and the circulation of the lubricating oil 7 is not affected. Furthermore, in blower A1, it is possible to prevent the shaft 9 and plate 50 from rotating together, which, for example, reduces a decrease in the rotation speed of the shaft 9. Furthermore, in the blower A1, it is possible to prevent the shaft 9 and the plate 50 from rotating together, thereby reducing, for example, noise (contact noise) and the generation of foreign matter when the shaft 9 and the plate 50 rotate together. Note that in this embodiment, the contact resistance of the comparison target is almost zero.

[0040] Furthermore, in blower A1, first cap 30 has side plate 32, and plate 50 is located between top plate 31 and protruding portion 35 of side plate 32 (see A in FIG. 5). Therefore, in blower A1, it is possible to position plate 50. When first cap 30 is attached to housing 10, protruding portion 35 prevents first cap 30 from coming off housing 10 because the upper end portion 12a of tubular portion 12 of housing 10 is crimped to constriction 35a of protruding portion 35. In other words, protruding portion 35 has a function of preventing first cap 30 from coming off.

[0041] The blower A1 also includes a lubricating oil 7. The lubricating oil 7 is filled in the recess 13 of the housing 10 so that the liquid level of the lubricating oil 7 is located above the lower end 34 of the side plate 32 of the first cap 30 and below the upper surface of the plate 50 (see A in FIG. 5 ). Therefore, the blower A1 can reduce the area where the lubricating oil 7 comes into contact with the air. This makes it possible to reduce evaporation of the lubricating oil 7, for example, when the temperature of the lubricating oil 7 becomes high due to the operating environment of the blower A1. Therefore, the blower A1 reduces evaporation loss of the lubricating oil 7 compared to a blower without the plate 50.

[0042] Furthermore, in the fan A1, the lubricating oil 7 comes into contact with the plate 50, which reduces the area of ​​the lubricating oil 7 that comes into contact with the air, and therefore, for example, when the temperature of the lubricating oil 7 becomes high due to the operating environment of the fan A1, it is possible to reduce evaporation of the lubricating oil 7. Therefore, the fan A1 reduces evaporation loss of the lubricating oil 7 compared to a fan not provided with the plate 50.

[0043] The blower A1 also includes a second cap 40 having a fourth through hole 43 and a fifth through hole 44. Therefore, in the blower A1, for example, the lubricating oil 7 filled above the second cap 40 can be replenished below the second cap 40 through the fifth through hole 44 of the second cap 40. The lubricating oil 7 can also move from above to below (or from below to above) the second cap 40 through the fourth through hole 43 (the gap between the second cap 40 and the shaft 9) or the slit 47. This prevents the lubricating oil 7 from running out below the second cap 40 in the recess 13 of the housing 10.

[0044] Furthermore, in fan A1, width H2 of recess 8 in the axial direction of shaft 9 is larger than thickness H1 of plate 50 (see A in FIG. 5). That is, in fan A1, even if shaft 9 moves up and down due to, for example, an unexpectedly large external force, there is a difference (margin) between width H2 of recess 8 and thickness H1 of plate 50.

[0045] (5) Modifications Each hook portion 53 of the plate 50 may have a chamfered (e.g., rounded) tip end as shown in FIG. 10 . In other words, each hook portion 53 of the plate 50 may have a chamfered portion 54. This makes it easier to insert the shaft 9 into the first through hole 21 of the sleeve 20 in the blower A1 than when each hook portion 53 does not have a chamfered portion 54. Furthermore, each hook portion 53 of the plate 50 may have a tip end that is wider than the tip end of each hook portion 53 in the first embodiment as shown in FIG. 11 . The number of the hook portions 53 is not limited to four and may be eight, for example, as shown in FIG. 12 . The number of the hook portions 53 may be six or one, for example. In short, the number of the hook portions 53 needs to be at least one.

[0046] The top plate 31 and side plate 32 of the first cap 30 are configured as a continuous, integrated unit. However, for example, they may be configured separately and then combined into an integrated unit. The protrusion 35 is provided around the entire circumference of the side plate 32, but it does not have to be around the entire circumference of the side plate 32. The first cap 30 may include a protrusion on the side plate 32 that protrudes toward the shaft 9 (toward the central axis of the second through hole 33) in addition to the protrusion 35. In this case, the protrusion is configured to sandwich the plate 50 with the protrusion 35. Furthermore, the number of protrusions need only be at least one. As a result, in the blower A1, even if the shaft 9 moves up and down during rotation due to, for example, an unexpectedly large external force, the vertical movement of the plate 50 is suppressed, thereby further preventing the shaft 9 from coming loose. Therefore, the blower A1 further prevents the shaft 9 from coming loose with a simpler configuration. Furthermore, in the blower A1, when the plate 50 is attached to the inside of the first cap 30, the positioning of the plate 50 is facilitated.

[0047] The fifth through hole 44 of the second cap 40 is provided on the periphery of the upper plate 48 so as to penetrate the upper plate 48 in the up-down direction. However, for example, it may be provided by cutting out the inner peripheral surface of the fourth through hole 43 in the upper plate 48. The main body portion 41 and the flange portion 42 of the second cap 40 are configured as a continuous, integrated unit. However, for example, they may be configured as separate units and then combined to form an integrated unit. The number of fifth through holes 44 in the second cap 40 is not limited to one, and may be multiple. The fifth through hole 44 is semicircular when viewed from the up-down direction of the upper plate 48. However, it may be circular, for example. The fifth through hole 44 is connected to the fourth through hole 43, but it does not have to be connected to the fourth through hole 43.

[0048] The plate 50 is not limited to a disk shape, and may be, for example, an elliptical plate shape, etc. The third through-hole 51 of the plate 50 may have any shape as long as the shaft 9 can rotate.

[0049] The recess 8 of the shaft 9 is provided over the entire circumference of the shaft 9, but it does not have to be provided over the entire circumference of the shaft 9.

[0050] The lubricating oil 7 may be filled up to the underside of the plate 50. The lubricating oil 7 may also be filled up to the underside of the upper plate 31 of the first cap 30. In other words, the plate 50 may be immersed in the lubricating oil 7. FIG. 16 shows an embodiment in which the plate 50 is immersed in the lubricating oil 7. In the blower A1, when the plate 50 is immersed in the lubricating oil 7 (see FIG. 16 ), the lubricating oil 7 can be filled for a longer period between the inner circumferential surface of the first through hole 21 in the sleeve 20 and the outer circumferential surface of the shaft 9 (first gap) than when the plate 50 is not immersed in the lubricating oil 7 (see FIG. 4 ). As a result, in the blower A1, when the plate 50 is immersed in the lubricating oil 7, it is possible to achieve a longer lifespan than when the plate 50 is not immersed in the lubricating oil 7.

[0051] Although the blower A1 includes the second cap 40, it may not include the second cap 40. In this case, the blower A1 may not include the lubricating oil 7 either.

[0052] The first embodiment and the modifications described above are merely a part of the various embodiments and modifications of the present disclosure.

[0053] (Embodiment 2) As shown in Figure 13, a blower A1 according to embodiment 2 differs from the blower A1 according to embodiment 1 in that the first cap 30 and a portion of the plate 50 of the bearing portion 60 are different. Note that, for the blower A1 according to embodiment 2, components similar to those of the blower A1 according to embodiment 1 (see Figures 1 to 9C) are denoted by the same reference numerals and will not be described again. Note that the dotted hatching in Figure 13 does not indicate a cross section of the lubricating oil 7. Furthermore, because the lubricating oil 7 is colorless and transparent or colored and transparent in Figure 13, the rear components are illustrated through the lubricating oil 7.

[0054] 13 and 14, the protrusion 35 of the first cap 30 is not provided around the entire circumference of the side plate 32, but is provided partially in the circumferential direction of the side plate 32. More specifically, the protrusion 35 is provided in a portion of the circumferential direction of the side plate 32 other than the portion where the notch 37 is provided.

[0055] As shown in Figures 13 and 14, the first cap 30 has one protrusion 36. The protrusion 36 protrudes toward the central axis of the second through hole 33 of the first cap 30. In other words, the protrusion 36 protrudes toward the shaft 9. The protrusion 36 is provided on the side plate 32. The protrusion 36 is provided on the side plate 32 so as to be located, for example, between the upper plate 31 of the first cap 30 and the protrusion 35. The protrusion 36 is provided, for example, in a portion of the side plate 32 other than the portion where the protrusion 35 is provided (see Figure 14). In other words, the protrusion 36 is provided in the circumferential direction of the side plate 32 near the portion where the notch 37 is provided.

[0056] (2) Plate The outer diameter of the plate 50 is, for example, the same as the inner diameter W1 of the first cap 30. The outer peripheral surface 52 of the plate 50 has one recess 55, for example, as shown in FIG. 15 . The recess 55 is provided, for example, in a part of the outer peripheral surface 52 of the plate 50. The recess 55 has, for example, an arc shape when viewed from the top-bottom direction of the plate 50.

[0057] The protrusion 36 of the first cap 30 has an arc-shaped tip. When the plate 50 is placed inside the first cap 30, for example, the tip of the protrusion 36 fits into the recess 55 of the plate 50. In other words, the protrusion 36 is configured to fit into the recess 55.

[0058] (3) Effects In the blower A1 of the second embodiment, the first cap 30 has the protrusion 36 and the outer peripheral surface 52 of the plate 50 has the recess 55, which, for example, makes it possible to prevent the shaft 9 and the plate 50 from co-rotating. Therefore, the blower A1 of the second embodiment does not agitate the lubricating oil 7, for example, and does not affect the circulation of the lubricating oil 7. In addition, the blower A1 of the second embodiment makes it possible to prevent the shaft 9 and the plate 50 from co-rotating, which, for example, reduces a decrease in the number of rotations (rotational speed) of the shaft 9. Furthermore, the blower A1 of the second embodiment makes it possible to prevent the shaft 9 and the plate 50 from co-rotating, which, for example, reduces noise (contact noise) and the generation of foreign matter when the shaft 9 and the plate 50 co-rotate.

[0059] Furthermore, in the fan A1 of the second embodiment, for example, when the plate 50 is disposed inside the first cap 30, the first cap 30 and the plate 50 do not press against each other as in the fan A1 of the first embodiment. Therefore, the fan A1 of the second embodiment makes it easier to attach the plate 50 to the first cap 30 than the fan A1 of the first embodiment.

[0060] (4) Modifications As a modification of the second embodiment, modifications similar to those of the blower A1 according to the modification of the first embodiment are possible. Therefore, the blower A1 according to the modification of the second embodiment also achieves the same effects as the blower A1 according to the second embodiment.

[0061] As a modification of the second embodiment, each of the hook portions 53 of the plate 50 may have a chamfered portion 54 (see FIG. 10 ), similar to each of the hook portions 53 of the plate 50 in the fan A1 of the first embodiment. The recessed portion 55 is arc-shaped when viewed from the top and bottom of the plate 50, but may have any shape as long as it can prevent the shaft 9 and the plate 50 from rotating together. The outer peripheral surface 52 of the plate 50 has one recessed portion 55, but may have multiple recessed portions 55. The first cap 30 has one protrusion 36, but may have multiple protrusions 36.

[0062] The second embodiment and the modified examples described above are merely a part of the various embodiments and modified examples of the present disclosure.

[0063] The present disclosure is not limited to the above-described embodiments, and at least some of the configurations of the embodiments and modified examples can be appropriately combined and applied.

[0064] (Aspects) The present specification discloses the following aspects.

[0065] The blower (A1) according to the first aspect includes a housing (10), a sleeve (20), a first cap (30), a plate (50), a shaft (9), and a propeller (81). The housing (10) has a recess (13) that opens upward. The sleeve (20) is disposed within the recess (13) and has a first through-hole (21). The first cap (30) is attached to the housing (10) so as to cover the recess (13) and has a second through-hole (33). The plate (50) is disposed within the first cap (30) and has a third through-hole (51). The shaft (9) is inserted through the first through-hole (21) of the sleeve (20), the second through-hole (33) of the first cap (30), and the third through-hole (51) of the plate (50). The propeller (81) is connected to the upper end of the shaft (9). The shaft (9) has a recess (8). At least a portion of the inner peripheral surface (51 a) of the third through hole (51) in the plate (50) is located within the recess (8) of the shaft (9). In a top view, the second through hole (33) of the first cap (30) is located inside the outer periphery of the plate (50).

[0066] According to this aspect, the shaft (9) is prevented from coming off with a simpler configuration.

[0067] The blower (A1) according to the second aspect is the same as the blower (A1) according to the first aspect, in which the recess (8) of the shaft (9) is provided over the entire circumference of the shaft (9).

[0068] According to this aspect, the shaft (9) is more effectively prevented from coming off with a simpler configuration.

[0069] In the blower (A1) according to the third aspect, in the first or second aspect, the plate (50) has a hook portion (53) whose tip is located in the recess (8) of the shaft (9). The hook portion (53) is provided on the inner circumferential surface (51 a) of the third through hole (51) in the plate (50).

[0070] According to this aspect, the shaft (9) is further prevented from coming off with a simpler configuration.

[0071] The blower (A1) according to a fourth aspect is the blower (A1) of any one of the first to third aspects, wherein the outer peripheral surface (52) of the plate (50) contacts the inner peripheral surface (38) of the first cap (30).

[0072] According to this aspect, it is possible to prevent the shaft (9) and the plate (50) from rotating together, and for example, the lubricating oil (7) is not stirred and the circulation of the lubricating oil (7) is not affected. Also, according to this aspect, it is possible to prevent the shaft (9) and the plate (50) from rotating together, and therefore, for example, a decrease in the number of rotations (rotation speed) of the shaft (9) is reduced. Furthermore, according to this aspect, it is possible to prevent the shaft (9) and the plate (50) from rotating together, and therefore, for example, contact noise and the generation of foreign matter when the shaft (9) and the plate (50) rotate together are reduced.

[0073] A blower (A1) according to a fifth aspect is the blower (A1) of any one of the first to fourth aspects, wherein the first cap (30) has an upper plate (31) located above the plate (50) and a side plate (32) connected to the upper plate (31) and surrounding the outer peripheral surface (52) of the plate (50). The side plate (32) includes a protrusion (35) that protrudes toward the shaft (9). The plate (50) is located between the upper plate (31) and the protrusion (35).

[0074] According to this embodiment, it is possible to position the plate (50).

[0075] The blower (A1) according to a sixth aspect is the blower (A1) of any one of the first to fifth aspects, further comprising lubricating oil (7) filled in the recess (13) of the housing (10). The plate (50) is immersed in the lubricating oil (7).

[0076] According to this embodiment, it is possible to extend the life of the plate (50) compared to when the plate (50) is not immersed in the lubricating oil (7).

[0077] The blower (A1) according to a seventh aspect is the fifth aspect, further comprising lubricating oil (7) filled in the recess (13) of the housing (10). The lubricating oil (7) is filled in the recess (13) so that the liquid level of the lubricating oil (7) is located above the lower end (34) of the side plate (32) of the first cap (30) and below the upper surface of the plate (50).

[0078] According to this aspect, for example, when the temperature of the lubricating oil (7) becomes high due to the environment in which the blower (A1) is used, it is possible to reduce evaporation of the lubricating oil (7).

[0079] The blower (A1) according to an eighth aspect is the blower (A1) of any one of the first to fifth aspects, further comprising lubricating oil (7) filled in the recess (13) of the housing (10). The lubricating oil (7) contacts the plate (50).

[0080] According to this aspect, for example, when the temperature of the lubricating oil (7) becomes high due to the environment in which the blower (A1) is used, it is possible to reduce evaporation of the lubricating oil (7).

[0081] The blower (A1) according to a ninth aspect is the fifth aspect, further comprising a second cap (40) disposed below the plate (50). The second cap (40) has a fourth through hole (43) and a fifth through hole (44). The fourth through hole (43) is provided in the second cap (40) so that the shaft (9) is inserted therethrough. The fifth through hole (44) is provided in the second cap (40) so as to be located above the lower end portion (34) of the side plate (32) of the first cap (30).

[0082] According to this aspect, for example, the lubricating oil (7) filled above the second cap (40) can be replenished below the second cap (40) through the fifth through hole (44) of the second cap (40).

[0083] The blower (A1) according to the tenth aspect is any one of the first to ninth aspects, wherein the width (H2) of the recess (8) in the axial direction of the shaft (9) is greater than the thickness (H1) of the plate (50).

[0084] The blower (A1) according to an eleventh aspect is the fifth aspect, wherein the outer peripheral surface (52) of the plate (50) has a recessed portion (55). The side plate (32) of the first cap (30) has a protrusion (36). The protrusion (36) is fitted into the recessed portion (55).

[0085] According to this aspect, for example, it is possible to prevent the shaft (9) and the plate (50) from rotating together, and for example, the lubricating oil (7) is not stirred and the circulation of the lubricating oil (7) is not affected. Also, according to this aspect, it is possible to prevent the shaft (9) and the plate (50) from rotating together, and therefore, for example, it is possible to reduce a decrease in the number of rotations (rotation speed) of the shaft (9). Furthermore, according to this aspect, it is possible to prevent the shaft (9) and the plate (50) from rotating together, and therefore, for example, it is possible to reduce the generation of contact noise and foreign matter when the shaft (9) and the plate (50) rotate together.

[0086] 7 Lubricating oil 8 Depression 9 Shaft 10 Housing 13 Recess 20 Sleeve 21 First through hole 30 First cap 31 Upper plate 32 Side plate 33 Second through hole 34 Lower end 35 Protrusion 36 Protrusion 38 Inner circumferential surface 40 Second cap 43 Fourth through hole 44 Fifth through hole 50 Plate 51 Third through hole 51a Inner circumferential surface 52 Outer circumferential surface 53 Hook portion 55 Depression 81 Propeller A1 Blower H1 Plate thickness H2 Depression width

Claims

1. A blower comprising: a housing having a recess that opens upward; a sleeve that is disposed within the recess and has a first through hole; a first cap that is attached to the housing so as to cover the recess and has a second through hole; a plate that is disposed within the first cap and has a third through hole; a shaft that is inserted through the first through hole of the sleeve, the second through hole of the first cap, and the third through hole of the plate; and a propeller connected to an upper end of the shaft, wherein the shaft has a recess, at least a portion of the inner surface of the third through hole in the plate is located within the recess of the shaft, and the second through hole of the first cap is located inside the outer periphery of the plate in a top view.

2. The blower according to claim 1, wherein the recess in the shaft is provided around the entire circumference of the shaft.

3. A blower as claimed in claim 1 or claim 2, wherein the plate has a hook portion whose tip is located within the recess of the shaft, and the hook portion is provided on the inner circumferential surface of the third through hole in the plate.

4. A blower according to any one of claims 1 to 3, wherein the outer peripheral surface of the plate contacts the inner peripheral surface of the first cap.

5. A blower as described in any one of claims 1 to 4, wherein the first cap has an upper plate located above the plate, and a side plate connected to the upper plate and surrounding the outer periphery of the plate, the side plate including a protrusion that protrudes toward the shaft, and the plate is located between the upper plate and the protrusion.

6. A blower according to any one of claims 1 to 5, further comprising a lubricating oil filled in the recess of the housing, the plate being immersed in the lubricating oil.

7. The blower according to claim 5, further comprising a lubricating oil filled in the recess of the housing, the lubricating oil being filled in the recess so that the liquid level of the lubricating oil is positioned above the lower end of the side plate of the first cap and below the upper surface of the plate.

8. The blower according to any one of claims 1 to 5, further comprising a lubricating oil filled in the recess of the housing, the lubricating oil contacting the plate.

9. The blower according to claim 5, further comprising a second cap disposed below the plate, the second cap having a fourth through hole and a fifth through hole, the fourth through hole being provided in the second cap so that the shaft can be inserted therethrough, and the fifth through hole being provided in the second cap so as to be positioned above the end of the side plate of the first cap.

10. A blower according to any one of claims 1 to 9, wherein the width of the recess in the axial direction of the shaft is greater than the thickness of the plate.

11. The blower according to claim 5, wherein the outer peripheral surface of the plate has a recessed portion, and the side plate of the first cap has a protruding portion, and the protruding portion is fitted into the recessed portion.

Images