TWI237096B - Dust-proof structure for a sleeve bearing - Google Patents

Abstract

A dust-proof structure for a sleeve bearing comprises an axial tube, a sleeve bearing having a first axial hole, a rotor having a shaft and a shaft base, and a dust cover having a second axial hole. The sleeve bearing is received in the axial tube, and then the dust cover is tightly confronted with an inner circumference of the axial tube on an end surface of the sleeve bearing. The shaft of the rotor is longitudinally extended from the shaft base, and passed through the second axial hole and the first axial hole. The dust cover is provided with a compensating thickness to compensate a gap formed between the sleeve bearing and the shaft base. Furthermore, the second axial hole of the dust cover has a diameter smaller than that of the shaft base so as to prevent dust entering into the sleeve bearing.

Description

1237096

V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a dust-proof structure of a motor bearing, and more particularly, to a dust-proof structure that prevents dust from accumulating in a sleeve bearing by using a dust-proof sheet. [Prior art] The combined structure of conventional motor bearings, as shown in Figure 1, the motor is composed of a base 10, a stator 20, and a rotor 30, and the base 10 is combined with a shaft tube 11 and the shaft The tube 11 can accommodate at least one bearing (s 1 ee ve bearing) 12. Therefore, a shaft 31 of the rotor 30 can pass through a shaft hole 120 of the bearing 12, so that the rotor 30 can be rotatably coupled to the base 10. Generally, the lubricating oil [not shown] contained in the bearing 12 can be sequentially followed by the rotation of the shaft 31 by the inner wall of the shaft hole 120, the top surface of the bearing 12, and the top surface of the bearing 12. All corners 12 ι of the periphery flow between the bearing 12 and the shaft tube 11 and then flow back to the inside of the bearing 12. Therefore, the lubricating oil of the bearing 1 can circulate on its own, and lubricate the surface of the shaft hole 丨 2 0, so as to reduce the friction between the shaft hole 120 and the shaft 3 丨, thereby reducing the rotation noise of the motor. Although the bearing 12 can reduce the loss of motor components, when the above-mentioned conventional motor is actually running, the bearing 12 is lubricated due to the excessive gap A ′ between the shaft seat 32 and the bearing 2 of the rotor 30. Oil easily spills out of the car by the pipe 1 1 outside. At the same time, the dust in the air also easily enters the shaft tube 11 ′ and falls on the top surface of the bearing 12 with the lubricant. The dust is further mixed with the lubricant to form an oil stain 9. Since the oil stain is driven by the lubricant on the top surface of the bearing, 2 will gradually accumulate at the position of the cut angle 1 2 1 and make

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The formed lubricating oil cannot circulate smoothly and then enter between the bearing 12 and the shaft tube 丨 丨. ， Σσ ° Oil pollution 90 prevents the circulation of lubricating oil, and causes a lack of lubrication between the shaft hole 丨 20 and the shaft 31, which in turn leads to a reduction in the rotation speed of the rotor 30, and heat generation due to friction and friction. In severe cases, the shaft 31 can even be blocked, which reduces the service life of the motor.

Another conventional motor bearing combination structure, such as US Patent No. 6,3 3 6,7 4 5 "Oil-Impregnated Bearing and Rotor Shaft Combination" and US Patent No. 6, 4 35, 722 "Combination Structure fQr Oil-Impregnated Bearing" invention patent, which discloses a motor in addition to a base, a stator, a rotor, a shaft tube and an oil-containing bearing. A door shape is further provided on the top surface of the oil-containing bearing, and the shaft is sleeved between the door-shaped upper cover and the oil-containing bearing to position the door-shaped upper cover and the positioning ring when the rotor is running. To prevent oil from flying out of the shaft tube and prevent dust from entering the shaft tube. However, the combined structure of the gate-shaped upper flange, the positioning ring, the shaft tube and the oil-containing bearing is too complicated, which is not conducive to the assembly operation of the motor. The most important thing is that the diameter of the shaft hole of the door-shaped upper cover is significantly larger than the outer diameter of the shaft seat of the rotor, so that in actual use, dust is still easy to enter through the shaft hole of the Π-shaped cover, and the lubricant is also easy to pass through the The shaft hole of the door-shaped cover is out of money. As a result, due to the formation of oil stains and the reduction of lubricating oil, the lack of lubrication between the shaft hole and the shaft, also caused problems such as reduced speed, noise, frictional heat generation, shaft sticking, and reduced motor life. . Therefore, it is still necessary to further improve the above-mentioned motor shaft

C: \ Logo-5 \ Five Continents \ PK9361. Ptd page 8 5. Description of the invention (3) Dust-proof construction. In view of this, the present invention improves the upper-bearing by providing a dust-proof sheet above. The point is that it is tied in the -shaft tube and can provide a suitable distance "4" = 2 to fit the inner wall of the shaft tube. At the same time, the Prevention of "2 shafts and 2 = rotor: outer diameter of the shaft seat. By using &, the present invention can make up the thickness of the shaft seat by using dust to increase the thickness by adjusting the dust-proof sheet. [Summary of the Invention] The assembly margin of the q-grid bearing. 4 ==: =; =: bearing; dust-proof structure, which is located on the inner wall of the shaft tube, and provides appropriate compensation for reducing the thickness; reducing the distance, so that the present invention has the effect of preventing the accumulation of ash shaft seat. To change and extend the life of the motor, provide a dustproof structure supported by the motor. A is provided with a dust-proof plate above one of the bearings in the shaft official, and the thickness of the dust-proof plate is adjusted according to the eighth, so that the present invention has two long t The effect of assembly margin. ^ Add bearing Another object of the present invention is to provide a dustproof structure for a motor vehicle bearing. A dustproof sheet is provided above a bearing in a shaft tube, and the dustproof 'ir: an annular cut edge or a rough surface, so that the present invention has an increase = Oil return 欵 = formation effect. A further object of the present invention is to provide a dust-proof structure of a motor bearing provided with a stab-proof plate above one of the bearings in a shaft tube. The dust-proof plate is two: 1 ^ 37096 5. Invention Month (4) '"- -^ Extends upward to form an inner ring flange, so that the present invention has the effect of increasing the dustproof effect. Shaft The dustproof structure of the motor bearing according to the present invention includes a shaft tube, a bearing, a rotor, and a dustproof sheet. The shaft tube can accommodate the bearing and the dustproof shaft. The bearing has a shaft hole. The rotor is provided with a shaft and a shaft seat. The shaft seat extends longitudinally and penetrates the shaft hole of the bearing. The dust-proof sheet is anti-scratching against the inner wall of the shaft tube and has a shaft hole through which the shaft can pass. Due to the appropriate compensation for the thickness, the dust plate can reduce the bearing and the shaft seat. The diameter of the shaft hole of the 5hai dust plate is smaller than the outer diameter of the shaft seat, so J = stops dust from accumulating in the bearing. [Embodiment] In order to let the above and other objects of the present invention be understood, the following will specifically enumerate the present invention. The following features and advantages can be explained in more detail, and disclosed in conjunction with Figure 2 of the attached drawings This is an exploded perspective view of Mingdi_, every η, the first; Tuma; = of: the dust structure [f the combination of the dust-proof structure of the second edition: the first: the large-scale diagram of the motor bearing of the embodiment; Figure 5 reveals t ^, Θ reveals the partial deployment of the third figure of the present invention ... Bureau: the perspective view of the second embodiment of the horse dust sheet; the seventh solid view reveals the dustproof structure of the third embodiment of the present invention Sharpness: a standing view of the dust sheet of the local example, FIG. 8 shows the motor bearing of the fourth embodiment of the present invention ^}; and FIG. 9 shows the fourth embodiment of the present invention, the horse far cylinder t dust Enlarged view of the combination of structures. … The parts of the dust-proof structure are the same as those in the figure

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^ The structure of the motor bearing is used, so the same parts of the two use the same drawing number, and the structure and function are not described in detail. Referring to Figures 2 and 3, the dust-proof structure of the motor bearing according to the first embodiment of the present invention includes a shaft tube 丨, a bearing 丨 2, a dust-proof sheet 丨 3, and a rotor 30. The shaft tube is a hollow tube body, which can be fixed to a base, and a positioning flange 20 is positioned with a top flange i1 latch. The bearing 12 is selected from various si eeve bearings that can contain lubricating oil, such as copper bearings made of powder metallurgy, or ceramic bearings made by sintering. The bearing 12 is accommodated in the shaft tube 1 丨, and the bearing 丨 2 is provided with a shaft hole 120 ° for loosely fitting a shaft 31 of the rotor 30. The peripheral edge of the top surface of the bearing 12 usually forms all corners 1 2 1. The dustproof sheet 1 3 is made of plastic or metal material, and is provided with a shaft hole 131 ′. The rotor 30 is provided with a shaft 3 1 and a shaft seat 3 2, and the shaft 3 1 is made of the shaft seat 32. Formed longitudinally. The shaft 31 passes through the shaft hole 120 of the bearing 12; at the same time, the shaft 31 can pass through the dust-proof plate 13 ^^ | The dust-proof sheet 1 3 is preferably selected to be properly integrated in the shaft tube 11 by means of tight fit or integral molding, and is located at one end of the bearing 丨 2, so that the dust-proof sheet 13 can prevent dust from entering the shaft tube 11 And the gap between the bearings 12. At the same time, the dust-proof sheet 1 3 is provided to make up the thickness d (see Figure 4). 'The dust-proof sheet 1 3 can reduce the distance between the bearing 12 and the shaft seat 32 of the rotor 30 as much as possible. The minimum gap a ′ between the dust plate 13 and the shaft seat 32 is formed to prevent dust from contacting the bearing 12. At the same time, the diameter of the shaft hole 1 31 of the dustproof sheet 13 is preferably smaller than the outer diameter of the shaft holder 32, that is, the shaft holder 32 at least covers the inner edge of the top surface of the dustproof sheet 13. Furthermore, the bottom of the shaft tube 11 may be

1237096 V. Description of the invention (6) A top support member 14 and a retaining ring 15 are provided. The top support member 14 is U-shaped, which can support the shaft 31 and accommodate lubricant. The retaining ring 5 is used to prevent the shaft 3 1 from disengaging from the bearing 12. Please refer to Figs. 3 and 4, when the base 10, the shaft tube n, the bearing 12, the dust-proof sheet 13, the top support member 14, the retaining ring 15, the stator 20 and the rotor 30 are assembled into a motor, The dustproof sheet 1 3 is tightly fitted and positioned in the shaft tube 丨 丨, and is located at one end of the bearing 12 (for example, above). When the rotor 30 is running, the anti-dust sheet 1 3 can provide an appropriate compensation thickness d to reduce the distance between the bearing 2 and the shaft seat 32 to form the smallest gap between the dust sheet 3 and the shaft seat 32. a 'and the diameter of the shaft hole 1 3 1 is smaller than the outer diameter of the shaft seat 32, so that it can prevent dust from contacting the bearing 12 or prevent dust from entering the gap between the shaft tube 丨 and the bearing 丨 2 and make the dust 91 is deposited on the top surface of the dust-proof sheet 13. At the same time, since the shaft hole 1 3 1 of the dust plate 1 3 has an appropriate longitudinal length d, the probability of the lubricant splashing from the bearing 12 can also be reduced. Furthermore, even if the dust piece 13 ^ |||; surface contacts the top surface of the bearing 12, the lubricating oil of the bearing 12 can still make use of the pores of the bearing 12 to flow back through the top of the bearing 2 The surface and the peripheral edge are cut at an angle 121 and enter the gap between the bearing 12 and the inner wall of the shaft tube n. This lubricating oil is caused to circulate. Therefore, the dustproof sheet 3 of the present invention can not only prevent the accumulation of dust 91 to form an oil stain 90 (as shown in FIG. 1), but also prevent the lubricant from splashing and does not affect the circulation of the lubricant, so it can indeed guarantee %% The lubricating degree of the shaft hole 120 avoids the sound of the shaft hole 120 and the === "sound, and thus maintains the life of the rotor peak protection motor. Furthermore, as shown in Figures 2 to 4, the dust sheet 13 makes up for Thickness

Page 12 Li C: \ Logo-5 \ Five Continents \ PK9361.ptd 1237096 V. Description of the invention (7) The longitudinal length specifications of the bearing 12 are adjusted. That is, when manufacturing various motors with different axial thicknesses, the present invention can make up the thickness d of the dust-proof sheet 3 to make the bearing 12 of a single longitudinal length specification suitable for manufacturing various motors with different axial thicknesses. Therefore, the cost of mold opening of the bearing 丨 2 is reduced, and the assembly margin of the single-size bearing 12 is increased. 4 Referring to FIG. 5, a dustproof structure of a motor bearing according to a second embodiment of the present invention is disclosed. Compared with the first embodiment, the dust-proof sheet 13 of the second embodiment further forms an annular cutting edge 132 at the bottom of the shaft hole 131. As a result, when the shaft 31 of the rotor 30 rotates, the ring cutting edge 32 facilitates the lubricating oil overflowing from the shaft hole 120 of the bearing 12 to tend toward the top surface of the bearing 12 and the chamfer 121 of the outer edge. Flow, thereby increasing the oil return efficiency of the bearing 12. Please refer to Figs. 6 and 7, which show a dustproof structure of a motor bearing according to a third embodiment of the present invention. Compared with the first embodiment, the dustproof sheet 13 of the third embodiment is an inner ring flange extending upward from the shaft hole 1 31, and the compensation thickness of the anti-sheet 13 and the inner ring flange 133 is made up. d is appropriately adjusted according to the distance between the bearing 12 and the shaft seat to form the smallest gap a between the dust sheet 13 and the shaft seat 32. In this way, the inner ring flange 133 can form a barrier to block and pile up the dust 91, so as to reduce the probability of the dust 9 丨 entering through the shaft hole 3 of the dust plate 3. At the same time, the inner ring flange 133 can also be used to prevent the lubricating oil of the bearing 12 from overflowing through the shaft hole 1 3 1. Please refer to Figures 8 and 9 for the dustproof structure of the horse bearing according to the fourth embodiment of the present invention. Since the bottom surface of the dust-proof sheet 丨 3 of the first embodiment slips and prevents the lubricating oil from flowing to the chamfer 121 of the outer edge of the bearing 12, the dust-proof sheet 13 of the forty-ninth embodiment further advances to form a rough surface i 34 on the bottom surface. . borrow

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When this shaft 31 rotates, even if the rough surface 134 of the dust sheet 13 contacts the top surface of the bearing 12, the rough surface 34 can still guide the smooth flow of lubricant overflowed from the shaft hole 120 of the bearing 12. The chamfer i2i of the outer edge of the bearing 12. In this way, the lubricating oil can then enter the gap between the bearing 2 and the inner wall of the shaft tube u, and form a circulating flow, thereby increasing the oil return efficiency of the bearing 2. As described above, the dust-proof structure of the conventional motor bearing in FIG. 1 has the disadvantages that it is easy to form oil stains 90, which hinder the circulation of the lubricating oil, and that the lubricating oil is easy to splash and overflow. The invention of FIG. The dust-proof sheet 13 provides an appropriate compensation thickness d to reduce the distance between the bearing 12 and the shaft seat 32, which can surely prevent the accumulation of oil pollution, increase the oil return efficiency, reduce the rotation noise and extend the service life of the motor. Although the present invention has been disclosed in detail using the foregoing preferred embodiments, it is not limited to: 2 The present invention 'anyone skilled in the art' can make various changes and modifications without departing from the present invention. Launch. The scope of protection shall be determined by the scope of the attached patent application.

Page 14 1237096______ Brief description of the drawings [Simplified description of the drawings] Figure 1: Combination sectional view of the combined structure of conventional motor bearings. Fig. 2 · An exploded perspective view of a dustproof structure of a motor bearing according to a first embodiment of the present invention. Fig. 3: A sectional view of the dust-proof structure of the motor bearing according to the first embodiment of the present invention. Figure 4: A partially enlarged view of Figure 3 of the present invention. Fig. 5 is a partially enlarged view of a dustproof structure of a motor bearing according to a second embodiment of the present invention. FIG. 6 is a perspective view of a dust-proof sheet according to a third embodiment of the present invention. Fig. 7 is a partially enlarged view of a dustproof structure of a motor bearing according to a third embodiment of the present invention. FIG. 8 is a three-dimensional rear view of a dust-proof sheet according to a fourth embodiment of the present invention. FIG. 9 is a partially enlarged view of a dust-proof structure of a motor bearing according to a fourth embodiment of the present invention. Description of drawing number: 10 base 11 shaft tube 111 top flange 12 bearing 120 shaft hole 121 chamfered angle 13 dust wiper 131 shaft hole 132 ring cut edge 133 inner ring flange 134 rough surface 14 top support 15 buckle 20 stator 30 Rotor 31 Shaft 32 Shaft seat 90 Grease 91 Dust

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Claims (1)

6. The scope of application for patents includes: A motor bearing-shaft tube-bearing-a rotor longitudinally extending one of the dust-proof bearings can be shrunk. The shaft seat can be applied according to the application. The rotor can be applied. The dust can be applied. The dust can be applied. The dust can be applied. The dust-proof according to the application, the dust-proof sheet can be used for dust-proof construction of a hollow tube body in the shaft tube, the shaft has a shaft and a shaft seat, and is manufactured in the middle and the middle. Its tight end should pass through, reduce the outer diameter of the bearing, and reduce the bearing's outer diameter. The range of patented shaft seat to the range of patented shaft hole. The range of patented shaft plate is located at the bottom of the patent range. The dust piece is fitted with the dust piece and the shaft is mentioned. Therefore, it can prevent the first item from covering as little as possible. The first item is extended at the bottom of the first item and the surface of the first item is extended to form the first item. The bearing is provided in a shaft hole inside the shaft tube, which is provided in a crack to provide a proper distance, and the dust bearing of the motor bearing and the dust plate of the motor bearing forms a ring. A thick wheel surface motor bearing is at one end of the shaft tube. The bearing is provided with a shaft hole wall of the shaft rod bearing, and is provided for the shaft to make up the thickness. The shaft hole touches the dustproof structure cutting edge of the inner edge of the top surface of the bearing. The dustproof structure of the dustproof structure of the inner ring flange, the inner wall of the dustproof structure of 〇, a shaft hole; the seat; and the shaft is not in contact so that the dustproof diameter is less than 〇, of which 〇, of which C: \ Logo-5 \ Five Continents \ PK9361a.ptc Page 16