JP3099306U - Assembly structure of motor shaft tube - Google Patents

Abstract

An oil storage space for a bearing can be formed, a gap can be reduced, and dust can be prevented from entering, thereby reliably increasing the reliability of assembly, increasing the service life of a bearing, and increasing the manufacturing process of assembly. Provided is an assembly structure of a motor shaft tube that can be simplified, balance rotation of a motor rotor, and further increase rotation stability.
A plurality of locking portions are formed on a locking member so as to extend upward from a bottom seat, and a plurality of hooks are formed on upper ends of the plurality of locking portions. The bush 14 is provided with a base and a plurality of positioning protrusions. The bush accommodates a bearing and forms an oil storage space. The bush is fitted inside the locking member, and the locking ring is positioned by the base. When the bush and the locking member are fitted into the shaft tube 11, the hook of the locking portion of the locking member clamps the stator set 3 outward and the locking portion clamps the bush inward. By being formed, the bush can tightly couple and position the bearing 4.
[Selection diagram] Fig. 1

Description

The present invention relates to an assembling structure of a motor shaft tube, in particular, using a locking member, a shaft tube and a bush to increase the reliability of assembly, prolong the service life of the bearing, simplify the manufacturing process of the motor, and simplify the manufacturing process of the motor. The present invention relates to a motor shaft tube assembly structure capable of balancing the rotation of the rotor and further improving the stability of the rotation.

(6) As a conventional structure for assembling a motor shaft tube, as shown in FIGS. 6 and 7, the structure of the motor shaft tube includes a frame seat 1 and a locking member 2. A shaft tube 11 is provided in the frame seat 1, a shaft hole 111 is formed in the shaft tube 11, and a plurality of concave grooves 112 are formed in an inner peripheral wall of the shaft hole 111 of the shaft tube 11. An opening groove 113 is formed extending from an upper portion of the opening 112. A plurality of locking portions 22 are provided from the bottom seat 21 of the locking member 2, and the bottom seat 21 is locked in the annular groove 114 at the bottom of the shaft tube 11 of the frame seat 1. It is formed so as to fit into the notched groove 112 and is formed so as to lock the stator set 3 by the hook 23 on the upper end. Further, a plurality of protrusions 115 are provided so as to protrude in the concave groove 112 on the inner peripheral wall of the shaft tube 11, and the bearings 4 can be provided above and below the protrusions 115. 5 can be fitted with the rotation shaft 51.

In the conventional structure for assembling the motor shaft tube as described above, the bearing 4 is sandwiched inward by the locking portion 22 of the locking member 2 and expanded outward to abut the stator set 3. Since the stator assembly 3 is formed to be locked by the hook 23 at the upper end of the locking portion 22, the bearing 4 can be accurately positioned without bias by the locking portion 22 of the locking member 2. The rotor 5 can rotate while maintaining the coincident center line, and the entire stator set 3 is firmly positioned, and there is no problem that the rotor set 5 falls off due to the cold shrinkage and thermal expansion of the shaft tube 11. However, the structure of the motor shaft tube still has problems in terms of assembly or use. For example, since the bearing 4 is formed so as to be positioned only by sandwiching the inner peripheral wall of the locking portion 21, the bearing 4 does not actually contact the inner peripheral wall of the shaft hole 111 of the shaft tube 11. The reliability of the assembly is relatively low. If the bearing 4 is an oil-impregnated bearing, the shaft tube 11 and the locking member 2 cannot provide a closed oil storage space, so that the lubricating oil of the bearing 4 easily flows away. When the rotating shaft 51 of the rotor 5 penetrates the two bearings 4 and attempts to assemble the locking ring 52 at the end of the rotating shaft, the space inside the shaft hole 111 of the shaft tube 11 is limited. The assembly of the locking ring 52 becomes difficult. Further, since there is an excessive gap between the shaft tube 11 and the inner surface of the rotor 5, dust easily enters the bearing 4, so that the above-described structure of the motor shaft tube is further improved. There must be.

The present invention was devised in view of such a problem, and the purpose thereof is to add a bush so that the shaft pipe and the locking member of the frame seat are applied to an oil-impregnated bearing, When the bush is fitted inside the locking member and the shaft tube, the bush can be positioned by being tightly coupled to the bearing, and at the same time, can be positioned by engaging with the locking ring. An oil storage space is formed, and the upper end of the bush is formed so as to extend upward in the axial direction, so that the gap can be reduced and dust can be prevented from entering. The aim is to provide a motor shaft tube assembly structure that can surely increase, increase the service life of bearings, simplify the manufacturing process of assembly, balance the rotation of the motor rotor, and further increase the stability of rotation It is.

A first object of the present invention is to fit a locking member and a bush inside a shaft pipe of a frame seat, a hook of a locking portion of the locking member locks the stator assembly outward, and furthermore, Since the locking portion of the locking member clamps the bush inward, the bushing allows the bearing and the locking ring to be tightly coupled and positioned, so that the reliability of the stator assembly and the rotation of the rotor are improved. An object of the present invention is to provide an assembly structure of a motor shaft tube that can enhance stability.

The second object of the present invention is to fit a locking member and a bush inside the shaft pipe of the frame seat, the bush can tightly couple the bearing, and the oil storage space of the bearing is formed, An object of the present invention is to provide a motor shaft tube assembly structure that can extend the service life of a bearing.

The third object of the present invention is to form the upper end of the bush so as to extend upward in the axial direction, thereby reducing the gap between the bush and the inner surface of the rotor to prevent dust from entering. An object of the present invention is to provide an assembly structure of a motor shaft tube that can avoid the problem and can extend the service life of the bearing.

The fourth object of the present invention is to store the lubricating oil of the bearing by storing the lubricating oil of the bearing by locking the bottom of the locking member to the bottom of the shaft tube and forming an oil storage chamber at the bottom of the shaft tube. It is an object of the present invention to provide an assembly structure of a motor shaft tube that can prevent the bleeding of the motor shaft and extend the service life of the bearing.

To achieve the above object, the assembly structure of the motor shaft tube according to the present invention is as follows. That is,
It is composed of a shaft tube, a locking member and a bush. The shaft tube is provided with a shaft hole and an inner peripheral wall, and the shaft tube is used for fitting a stator set. The locking member is provided with a bottom seat, a plurality of locking portions, and a plurality of hooks. The bottom seat can be fitted and sealed at the bottom of the shaft hole. The locking portion extends upward from the periphery of the upper end of the bottom seat. The hook is formed at the upper end of the locking portion. The bush is provided inside the locking portion, and the bush can accommodate a bearing, and the bush is provided with a base. When the bush and the locking member are fitted into the shaft tube, the locking member uses the hook of the locking portion to pinch and fix the stator set outward, and the locking portion further moves inward. By utilizing the pinching of the bush, the bush can tightly couple and position the bearing.

組 立 In the assembly structure of the motor shaft tube according to the present invention, the inner peripheral wall of the shaft tube is provided with a plurality of concave grooves, and the locking member can be positioned by the concave grooves. In addition, the bush is provided with a plurality of positioning protrusions, and the positioning protrusions are fitted into the opening grooves formed between the locking portions of the locking member so that the bush faces the locking member. It can also prevent rotation. Further, the upper end of the bush is formed so as to extend in the axial direction upward, and by reducing the gap between the upper end of the bush and the inner surface of the rotor, dust can be prevented from entering the bearing. . Further, a plurality of other positioning grooves are provided at the bottom of the inner peripheral wall of the shaft hole of the shaft tube so as to be recessed, and a plurality of positioning protrusions corresponding to the other positioning grooves protrude from the bottom seat of the locking member. It can also be provided to perform. Further, the bush can be prevented from being detached from the shaft tube by providing a plurality of other protrusions at the upper end of the inner peripheral wall of the shaft hole of the shaft tube. Further, a plurality of other protruding ribs are provided on the outer peripheral wall of the bush, and the protruding rib of the bush can closely approach both sides of the protrusion of the shaft tube, so that rotation of the bush can also be prevented. . In addition, another locking ring is provided, and the locking ring is sandwiched between the base seat of the bush and the bottom seat of the locking member, so that the rotation axis of the rotor can be positioned. Also, the locking ring may be positioned on the step-like portion at the upper end of the bottom seat of the locking member. Further, the bearing may be formed of an oil-impregnated bearing, a self-lubricating bearing, a copper bearing, or a sintered bearing. In addition, a plurality of lubricating oil collecting grooves may be provided on the outer peripheral wall of the bearing.

According to the assembly structure of the motor shaft tube of the present invention, the locking member and the bush are fitted inside the shaft tube of the frame seat, and the hook of the locking portion of the locking member locks the stator assembly outward. Further, since the locking portion of the locking member clamps the bush inward, the bearing and the locking ring can be tightly coupled and positioned by the bush, so that the reliability of the assembly of the stator set and the reliability are improved. There is an advantage that the rotation stability of the rotor can be increased.

According to the assembly structure of the motor shaft tube of the present invention, the locking member and the bush are fitted inside the shaft tube of the frame seat, the bush can tightly couple the bearing, and the oil storage space of the bearing is formed. Therefore, there is an advantage that the service life of the bearing can be extended.

According to the motor shaft tube assembly structure of the present invention, the upper end of the bush is formed so as to extend in the axial direction upward, so that the gap between the bush and the inner surface of the rotor is reduced, and dust is reduced. There is an advantage that the service life of the bearing can be prolonged because it can be prevented from entering.

According to the assembly structure of the motor shaft tube of the present invention, the bottom seat of the locking member locks the bottom of the shaft tube, and the oil storage chamber is formed at the bottom of the shaft tube to store the lubricating oil of the bearing. It is possible to prevent the lubricating oil from oozing out, so that there is an advantage that the service life of the bearing can be extended.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of an assembled structure of a motor shaft tube according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a local portion of an assembled structure of a motor shaft tube of an embodiment of the present invention, and FIG. FIG. 4 is a cross-sectional view of the assembled state of the motor shaft tube according to the embodiment of the present invention, and FIG. 4 is a plan view of the assembled state of the motor shaft tube of the embodiment of the present invention. FIG. 3 is a cross-sectional view of the motor shaft tube assembled according to the embodiment of the present invention.

Some of the members of the assembly structure of the motor shaft tube of the present invention are the same as those of the conventional structure of the motor shaft tube shown in FIGS. 6 and 7. Therefore, the members of the same portions are designated by the same reference numerals. Therefore, its structure and functions will not be described again in detail.

Referring to FIG. 1, the assembled structure of the motor shaft tube according to the embodiment of the present invention includes a shaft tube 11, a locking member 2, and a bush 14. The shaft tube 11 is usually formed at a central position of the frame seat 1 so as to be integrated, and is made of a material such as plastic. Since the outer peripheral wall of the shaft tube 11 can be formed in a cylindrical shape having a single diameter or a stepped shape having a plurality of diameters according to the demand in use, the stator set 3 having various standards can be formed. It can be assembled with the circuit board 31. A shaft hole 111 is formed in the shaft tube 11, and a plurality of concave grooves 12, a plurality of positioning grooves 121, and a plurality of protrusions 13 are provided on the inner peripheral wall of the shaft hole 111. The concave groove 12 is provided so as to be recessed in the inner peripheral wall of the shaft hole 111 so as to be equiangular and symmetric in the axial direction. The positioning groove 121 is provided so as to be recessed at the bottom of the inner peripheral wall of the shaft hole 111, and is positioned so as to intersect with the concave groove 12. The protrusion 13 is provided so as to protrude at the upper end of the inner peripheral wall of the shaft hole 111, and is positioned so as to intersect with the concave groove 12. The number of the recessed groove 12, the positioning groove 121 and the projection 13 of the present invention is preferably three each.

Referring again to FIG. 1, the locking member 2 of the motor shaft tube assembly structure according to the embodiment of the present invention is made of an elastic material such as plastic, and the locking member 2 is inserted into the shaft hole 111 of the shaft tube 11. The locking member 2 includes a bottom seat 21, a plurality of locking portions 22, and a plurality of hooks 23. Since a plurality of positioning projections 24 are provided so as to protrude from the bottom seat 21 in the outer radial direction, the positioning projections 24 can be engaged with and coupled to the positioning grooves 121 of the shaft tube 11. Can be tightly fitted and sealed. A stepped portion 25 and an oil storage chamber 26 are formed in the bottom seat 21 inward, and the stepped portion 25 can hold a locking ring 52. The oil storage chamber 26 further stores lubricating oil. It can be used to limit the seepage of lubricating oil. The locking portion 22 is formed so as to extend upward from the peripheral edge of the bottom seat 21, and the locking portion 22 can fit into the concave groove 12 of the shaft tube 11. The hook 23 is formed so as to extend from the upper end of the locking portion 22 toward the outer diameter direction. The hook 23 locks the stator set 3 when assembling the motor due to expansion or contraction of the elastic material. Can be positioned. The number of the locking portions 22, hooks 23 and positioning projections 24 of the present invention is preferably three each.

Referring to FIG. 1 again, since the bearing 4 can be fitted to the bush 14 of the motor shaft tube assembly structure of the embodiment of the present invention, the rotating shaft 51 of the rotor 5 is fitted by the bearing 4. Can be combined. The bush 14 includes a base 141, a plurality of positioning protrusions 142, a through hole 143, and a plurality of projecting ribs 144. When the bush 14 is assembled and connected to the locking member 2, the locking ring 52 can be locked to the step-like portion 25 and positioned by the base 141 of the bush 14. The positioning protrusion 142 can be fitted into an opening groove (not shown) formed between the locking portions 22, so that the bush 14 can be prevented from rotating relative to the locking member 2. . The through hole 143 can be used for the rotary shaft 51 to fit and pass therethrough. When the bushing 14 and the locking member 2 are fitted into the shaft tube 11, the protruding ribs 144 can come close to both sides of the protrusion 13 of the shaft tube 11. In the present invention, the bearing 4 preferably comprises an oil-impregnated bearing, a self-lubricating bearing, a copper bearing, and a sintered bearing, and the bearing 4 is provided with a through hole 41 and a plurality of lubricating oil collecting grooves 42. Since 42 is provided on the outer peripheral wall of the bearing 4, the lubricating oil can circulate and flow.

Referring to FIGS. 2, 3, and 4, when the shaft tube 11, the locking member 2 and the bush 14 are initially assembled in the present invention, first, the bush 14 and the locking ring 52 are fitted to the locking member 2, and then, Again, the bush 14 and the locking member 2 are simultaneously fitted into the shaft tube 11 again. Thereby, the locking ring 52 can be positioned by being sandwiched between the step-like portion 25 of the locking member 2 and the base 141 of the bush 14. By locking the locking portion 22 using the positioning protrusion 142 and locking the protrusion 13 using the protruding rib 144, the bush 14 itself is prevented from rotating relative to the locking member 2. can do. The locking portion 22 of the locking member 2 is coupled using the concave groove 12, and the positioning protrusion 24 of the locking member 2 is locked using the positioning groove 121, thereby locking the shaft tube 11. The reliability by assembling the member 2 can be increased. By locking the positioning projection 142 of the bush 14 using the projection 13, it is possible to prevent the bush 14 from dropping off the shaft tube 11 upward.

Referring to FIG. 5, when assembling the stator set 3, the circuit board 31, the bearing and the rotor further in the present invention, first, the through hole of the circuit board 31 and the stator set 3 is used to fit the outer diameter of the shaft tube 11. With this arrangement, the hook 23 at the upper end of the locking portion 22 can elastically lock the upper end of the stator set 3 with elasticity. Then, the bearing 4 is fitted into the bush 14 by a compression method. At this time, the locking portion 22 of the locking member 2 is formed so as to contract by the sandwiching of the stator set 3 and at the same time, the bush 14 is formed to expand by the expansion of the bearing 4. 4, the stator assembly 3, the circuit board 31, and the bearing 4 outside the shaft tube 11 can simultaneously obtain the best positioning effect. Finally, since the rotor 5 can be fitted through the through hole 41 of the bearing 4 and the locking ring 52 by the rotating shaft 51 and passed therethrough, the function of positioning the rotating shaft 51 can be provided. Can contact the oil storage chamber 26 of the bottom seat 21 of the locking member 2. Therefore, according to the small brushless DC motor assembled in the present invention, the bearing 4 can be tightly coupled and positioned by using the bush 14, and the assembly of the locking ring 52 can be simplified. In addition, it is possible to form an oil storage space for the bearing 4 and a lubricating oil recovery space, to effectively enhance the rotation stability of the rotor 5, to avoid the generation of noise due to uneven rotation, and to shorten the service life of the motor. Can be extended. Further, the upper end of the bush 14 can be formed so as to extend in the axial direction according to the demand in use, so that the gap between the upper end of the bush 14 and the inner surface of the rotor 5 is reduced. By doing so, it is possible to prevent dust from entering the bearing 4.

As described above, according to the conventional motor shaft tube assembling structure shown in FIG. 6, the reliability of assembling the bearing 4 is low, there is no oil storage space, the assembling of the locking ring 52 is difficult, and dust is further reduced. However, according to the assembly structure of the bush 14, the shaft tube 11, and the locking member 2 of the present invention, the reliability of the assembly is increased, the service life of the bearing is extended, and the like. It can simplify the manufacturing process of assembly, maintain the rotation balance and rotation stability of the motor rotor, and the assembled small brushless DC motor has oil-impregnated bearings, automatic lubricating bearings, copper bearings, sintered bearings Can be applied to

The invention may be implemented in other ways without departing from its spirit and essential characteristics. Accordingly, the preferred embodiments described herein are illustrative and not limiting.

FIG. 2 is an exploded perspective view of the motor shaft tube according to the embodiment of the present invention; FIG. 2 is an exploded perspective view of a local portion of the motor shaft tube according to the embodiment of the present invention; FIG. 3 is a sectional view of a partially assembled state of the motor shaft tube according to the embodiment of the present invention; FIG. 3 is a plan view of a partially assembled state of the motor shaft tube according to the embodiment of the present invention; FIG. 3 is a sectional view of the motor shaft tube assembled according to the embodiment of the present invention; It is an exploded perspective view by the conventional motor shaft tube assembly structure. It is sectional drawing of the state assembled by the conventional motor shaft tube assembly structure.

Explanation of reference numerals

REFERENCE SIGNS LIST 1 frame seat 11 shaft tube 111 shaft hole 112 concave groove 113 open groove 114 annular groove 115 protrusion 12 concave groove 121 positioning groove 13 protrusion 14 bush 141 base 142 positioning protrusion 143 through hole 144 protrusion rib 2 locking member 21 Bottom seat 22 Locking portion 23 Hook 24 Positioning protrusion 25 Stepped portion 26 Oil storage chamber 3 Stator set 31 Circuit board 4 Bearing 41 Through hole 42 Lubricating oil collecting groove 5 Rotor 51 Rotating shaft 52 Locking ring

Claims (11)

An assembly structure of a motor shaft tube comprising a shaft tube (11), a locking member (2) and a bush (14), wherein the shaft tube (11) is provided with a shaft hole (111) and an inner peripheral wall, The shaft tube (11) is used for fitting the stator set (3), and the locking member (2) has a bottom seat (21), a plurality of locking portions (22) and a plurality of hooks (23). The bottom seat (21) can be fitted and sealed at the bottom of the shaft hole (111), and the locking part (22) is formed to extend upward from the periphery of the upper end of the bottom seat (21). , The hook (23) is formed at the upper end of the engaging portion (22), the bush (14) is provided inside the engaging portion (2), and the bush (14) can accommodate the bearing (4). The bush (14) is provided with a base (141), and the bush (14) and the locking member (2) are fitted into the shaft tube (11). The locking member (2) uses the hook (23) of the locking portion (22) to pinch and fix the stator set (3) outward, and further the locking portion (22) is moved inward. The assembly structure of a motor shaft tube, characterized in that the bushing (14) can tightly couple and position the bearing (4) by utilizing the pinching of the bushing (14). The inner peripheral wall of the shaft tube (11) is provided with a plurality of concave grooves (12), and the locking member (2) can be positioned by the concave grooves (12). Motor shaft tube assembly structure. The bush (14) is further provided with a plurality of positioning projections (142), and the positioning projections (142) are provided inside the opening grooves formed between the locking portions (22) of the locking member (2). The assembly structure of a motor shaft tube according to claim 1, wherein the fitting prevents the bush (14) from rotating relative to the locking member (2). The upper end of the bush (14) is formed so as to extend in the axial direction upward, and by reducing the gap between the upper end of the bush (14) and the inner surface of the rotor (5), dust is reduced. 2. The motor shaft tube assembling structure according to claim 1, wherein the motor shaft tube can be prevented from entering. A plurality of positioning grooves (121) are provided in the bottom of the inner peripheral wall of the shaft hole (111) of the shaft tube (11) so as to be recessed, and the bottom seat (21) of the locking member (2) is provided with another. The assembly structure for a motor shaft tube according to claim 1, wherein a plurality of positioning projections (24) corresponding to the positioning grooves (121) are provided so as to protrude. At the upper end of the inner peripheral wall of the shaft hole (111) of the shaft tube (11), a plurality of projections (13) are provided so as to protrude, so that the bush (14) is detached from the shaft tube (11). The assembly structure for a motor shaft tube according to claim 1, wherein the motor shaft tube can be prevented. A plurality of protruding ribs (114) are provided on the outer peripheral wall of the bush (14), and the protruding ribs (114) of the bush (14) closely approach both sides of the protrusion (13) of the shaft tube (11). The assembly structure of a motor shaft tube according to claim 6, wherein the bush (14) can be prevented from rotating by being able to do so. In addition, a locking ring (52) is provided, and the locking ring (52) is sandwiched between a base (141) of the bush (14) and a bottom seat (21) of the locking member (2). The assembly structure for a motor shaft tube according to claim 1, wherein the rotation shaft (51) of the rotor (5) can be positioned. The assembly structure of the motor shaft tube according to claim 1, wherein the locking ring (52) is positioned at a stepped portion (25) at the upper end of the bottom seat (21) of the locking member (2). The assembly structure of the motor shaft tube according to claim 1, wherein the bearing (4) comprises an oil-impregnated bearing, an automatic lubricating bearing, a copper bearing, and a sintered bearing. The assembly structure of a motor shaft tube according to claim 1, wherein a plurality of lubricating oil recovery grooves (42) are provided on an outer peripheral wall of the bearing (4).

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