JP2003097551A - Preload structure for bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a preload structure for a bearing, permitting preload to be applied to a bearing in a more workable and productive manner during assembling a motor. SOLUTION: A bracket 9 consists of a thrust washer 1 having a protrusion 4 on the outer periphery, a groove 5 provided corresponding to the protrusion 4 of the thrust washer 1 in the axial direction, and a groove 6 provided at a position, where the thrust washer 1 is arranged, in the radial direction. After the bracket 9 is charged with a spring element 2, the protrusion 4 of the thrust washer 1 is inserted along the groove 5 in the axial direction, the thrust washer 1 is rotated at the position of the groove 6 in the radial direction to dislocate the protrusion 4, and the thrust washer 1 and the spring element 2 are held by the spring load of the spring element 2 for unitization with the bracket 9.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing preload structure for a motor in which a bearing for supporting a rotating shaft of the motor is preloaded by a constant pressure preload using a spring element. is there. 2. Description of the Related Art When a preload of a bearing 3 for supporting a rotating shaft of a motor is performed by a constant pressure preload using a spring element 2, a motor assembling process is shown in FIGS. 4 (a), (b), and FIG. (A), (b)
As shown in FIGS. 6A and 6B, after the rotor 7 with the bearing 3 attached thereto is inserted into the stator 8, the spring element 2 such as a wave washer is provided on the inner peripheral portion of the bracket 9 fitted with the outer ring of the bearing 3. In addition, a thrust washer 1 for appropriately and uniformly applying a spring load to the bearing 3 is mounted on the inner peripheral portion of a bracket 9 fitted with the outer ring of the bearing 3 and the bearing 3 for the purpose of preventing creep of the outer ring of the bearing 3. After applying the adhesive, the bracket 9 was attached to the stator 8 and fixed with screws 10. [0003] However, the spring element 2 and the thrust washer 1 loaded on the bracket 9 are arranged downward when the stator 8 is mounted. Workability was bad. Further, since the arrangement position of the spring element 2 at the free height and the adhesive application position interfere with each other, automation of the adhesive application is difficult, and there is a problem that productivity is poor. Furthermore, an unbalanced load is applied to the bearing 3 due to forgetting to insert the thrust washer 1, an error in the order of inserting the thrust washer 1 and the spring element 2, or a biting of the thrust washer 1,
There were problems related to the reliability of the bearing 3 such as occurrence of preload loss. The present invention has been made to solve such a problem, and an object of the present invention is to provide a bearing preload structure that can improve workability and productivity when applying a preload to a bearing during motor assembly. Is what you do. In order to solve the above-mentioned problems, according to the present invention, a thrust washer having a projection on an outer peripheral portion and a groove corresponding to the projection of the thrust washer are provided in the axial direction. After mounting the spring element on the bracket using a bracket with a groove in the radial direction where the groove is located, insert the projection of the thrust washer along the axial groove, and rotate the thrust washer at the radial groove position By shifting the projection position and holding the thrust washer and the spring element by the spring load of the spring element,
It is to be unitized with the bracket. An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a thrust washer 1 provided with a projection 4 on an outer peripheral portion and a projection 4 of the thrust washer 1.
After mounting the spring element 2 on the bracket 9 using a bracket 9 having a groove 5 corresponding to the axial direction and a groove 6 provided radially at a position where the thrust washer 1 is disposed,
The projection 4 of the thrust washer 1 is inserted along the groove 5 in the axial direction. Thereafter, the thrust washer 1 is rotated at the position of the groove 6 in the radial direction to shift the position of the projection 4. As a result, the thrust washer 1 and the spring element 2 are held by the spring load of the spring element 2, and the unitization with the bracket 9 becomes possible. By doing so, the thrust washer 1 and the spring element 2 do not fall off when the bracket 9 is attached to the stator 8, and workability is improved. Also, as shown in FIG. 2, in the step of applying the adhesive 11 for the purpose of preventing the bearing 3 from creeping, since the application position of the adhesive 11 does not interfere with the arrangement position of the spring element 2, the application of the adhesive 11 is automated. , The productivity is improved. Further, in the preloading structure of the bearing 3 of the present invention, since the thrust washer 1 is always arranged on the spring element 2, the thrust washer 1 is forgotten to be inserted or the thrust washer 1 and the insertion order of the spring element 2 are incorrect. Since there is no biting of 1 and the like, the reliability of the bearing 3 is improved. In addition, since the groove 6 provided in the radial direction allows the spring element 2 to move in the axial direction, an appropriate preload can be applied to the bearing 3. Also,
As shown in FIG. 3A, a jig hole 1 is provided in the thrust washer 1.
2 and the jig groove 13 as shown in FIG. 3B, the thrust washer 1 is attached to the bracket 9.
The workability is improved in the process of inserting and holding into the work. By unitizing the thrust washer 1, the spring element 2, and the bracket 9 in this manner, the bracket 9 is attached to the stator 8.
The workability is improved because the thrust washer 1 and the spring element 2 do not fall off during the installation. In addition, bearing 3
In the step of applying the adhesive 11 for the purpose of preventing creep of
Since the application position of the adhesive 11 on the inner peripheral portion of the bracket 9 and the disposition position of the spring element 2 do not interfere with each other, the adhesive 11
Since automatic coating of the resin becomes possible, productivity is improved. As described above, according to the present invention, in a motor in which a bearing for supporting a rotating shaft of a motor is preloaded by a constant pressure preload using a spring element, the spring is appropriately and uniformly applied to the bearing. A projection is provided on the outer periphery of the thrust washer for applying a load, and an axial groove corresponding to the projection of the thrust washer is provided on the inner periphery of the bracket to be fitted with the bearing,
By providing a radial groove at the position where the thrust washer is arranged, the spring element and the thrust washer are held and unitized with the bracket, so workability when applying preload of the bearing during motor assembly is improved. There is a great effect that the productivity can be improved and the reliability of the bearing can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a bearing portion in an embodiment of the present invention, wherein (a) shows a state before a thrust washer is assembled,
(B) shows a state after the thrust washer is assembled. FIGS. 2A and 2B are side sectional views showing a bearing unit according to an embodiment of the present invention, wherein FIG. 2A shows the entire bearing unit, and FIG. 2B shows an enlarged view of the area around the thrust washer. 3A and 3B are plan views showing a shape of a thrust washer according to an embodiment of the present invention, wherein FIG. 3A is provided with a jig hole and FIG. 3B is provided with a jig groove. FIG. 4 is a perspective view showing a bearing unit in the related art, and is a view corresponding to FIG. FIG. 5 is a perspective view showing a motor according to the related art, in which only a bearing portion is exploded and shown. FIG. 6 is a side sectional view showing a bearing unit according to a conventional technique;
(A) shows a state where the bearing is mounted on the bracket,
(B) shows a state before mounting the bearing on the bracket. [Description of Signs] 1 thrust washer, 2 spring element, 3 bearing, 4 protrusion, 5 groove (axial direction), 6 groove (radial direction), 7 rotor, 8 stator, 9 bracket, 10 screw, 11 adhesive, 12 Jig hole, 13 Jig groove

Claims (1)

Claims: 1. A motor in which a bearing for supporting a rotating shaft of a motor is preloaded by a constant pressure preload using a spring element, wherein an outer peripheral portion of a thrust washer for evenly applying a spring load to the bearing. A projection is provided, and an axial groove corresponding to the projection of the thrust washer is provided on the inner peripheral portion of the bracket to be fitted with the bearing, and a radial groove capable of rotating the thrust washer in the circumferential direction is provided at a position where the thrust washer is arranged. A preloading structure for a bearing, wherein the preload structure holds a spring element and a thrust washer by being provided, and is unitized with a bracket.