JPH0648370U - Motor rotating pulley - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a rotary pulley for a motor, which has high reliability without deterioration of shape due to creep, and which can obtain a large fixing strength as a large-sized product even if the physique is downsized. A rotary shaft 1, a rotary yoke plate 2 that is inserted and fixed until the tip of the rotary shaft 1 projects, and a center hole is fitted and fixed to the distal end of the rotary shaft 1 that projects from the rotary yoke plate 2. A rotary pulley 3 of a motor that drives a belt by the rotary pulley 3. The boss 4 was fitted and fixed to the opposing rotary pulley 3 or rotary yoke plate 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a motor, and more particularly to a rotary pulley mounting structure.

[0002]

[Prior art]

 There is a motor equipped with a rotary pulley for transmitting the torque of the motor to the outside by a belt. FIG. 4 shows an example of a rotary pulley of a conventional motor. In FIG. 4, the rotating yoke plate 22 has a cylindrical shape with a bottom, a driving magnet 24 is attached to the inside of the peripheral wall, and a through hole is formed in the center of the bottom plate located above the rotating yoke plate 22. Has been. A boss 26 is attached to the upper portion of the rotary yoke plate 22. A through hole 27 is formed in the center of the boss 26, and an edge portion of the through hole 27 on the lower surface side projects downward to form a press-fitting portion 26a. The press-fitting portion 26a is press-fitted into the through hole of the rotary yoke plate 22 so that the boss 26 is fitted and fixed to the rotary yoke plate 22. The rotary shaft 21 is press-fitted into the through hole 27 at the center of the boss 26.

On the other hand, a rotary pulley 23 made of resin is attached to the outer surface of the boss 26. On the outer peripheral surface of the rotary pulley 23, an angular groove 28 on which the belt is hung is formed. Further, a relatively large through hole 25 is formed in the central portion of the rotary pulley 23. The through hole 25 is press-fitted into the outer surface of the boss 26 and fitted to each other, whereby the rotary pulley 23 rotates the rotary yoke plate 22. It is fixed to.

The magnet 24 attached to the inside of the peripheral wall of the rotary yoke plate 22 faces a stator core (not shown) with a gap. Therefore, the rotating yoke plate 22 is urged in one direction by controlling the power supply to the coil wound around the salient poles of the stator core, and the rotating shaft 21 and the rotating pulley 23 are driven to rotate. Since a belt (not shown) is hung on the rotary pulley 23, the driving force of the motor is transmitted to other parts other than the motor by this belt.

[0005]

[Problems to be solved by the device]

 According to the conventional rotary pulley of the motor as described above, since the rotary pulley 23 to be press-fitted is made of resin, creep occurs due to the stress at the time of press-fitting into the boss 23, and as a result, the rotary pulley 23 is not cracked. Cause quality deterioration. Further, if the rotary pulley 23 is made smaller in accordance with the downsizing of the motor, the contact area between the boss 26 and the rotary pulley 23 becomes smaller, and the strength when rotated cannot be sufficiently obtained.

Although it is conceivable to directly press fit a resinous rotary pulley onto a metal rotary shaft, even in such a case, there are problems such as the above-mentioned creep, cracking and insufficient strength.

The present invention has been made in order to solve the above problems, and does not cause quality deterioration due to creep, and has a large fixing strength as a large product even if the physique is downsized. An object is to provide a rotating pulley of a motor that can be obtained.

[0008]

[Means for Solving the Problems]

 In order to achieve the above objects, the present invention provides a rotary shaft, a rotary yoke plate that is inserted and fixed until the distal end of the rotary shaft projects, and a distal end of the rotary shaft that projects from the rotary yoke plate. In a rotary pulley of a motor that is equipped with a rotary pulley that fits and fixes a central hole and that drives the belt by the rotary pulley, a plurality of bosses are provided on either of the facing planes of the rotary pulley and the rotary yoke plate. The boss is formed, and the boss is fitted and fixed to the opposing rotary pulley or rotary yoke plate.

[0009]

[Action]

 After the boss is formed on either the rotary pulley or the rotary yoke plate, the boss is press-fitted into either the rotary yoke plate or the rotary pulley facing each other so that the rotary pulley and the rotary yoke plate are relatively positioned. Fitted and fixed.

[0010]

【Example】

 An embodiment of a rotary pulley of a motor according to the present invention will be described below with reference to the drawings. 1 and 2, a through hole 9 is formed in the central portion of the rotary yoke plate 2. The through-hole 9 is formed by burring, and therefore the edge portion of the through-hole 9 protrudes upward in a cylindrical shape to form a protrusion 2a. The rotary shaft 1 is press-fitted into the through hole 9, and the upper end of the press-fitted rotary shaft 1 is slightly projected from the rotary yoke plate 2. The rotary yoke plate 2 has a plurality of through holes 5 formed around the portion where the rotary shaft 1 is press-fitted. The rotary yoke plate 2 is formed in a cylindrical shape with a bottom and has a rotor magnet fixed thereto as in the conventional example shown in FIG. 4, but it is not shown in FIGS. 1 and 2.

A rotary pulley 3 is attached to the upper portion of the rotary yoke plate 2. The rotary pulley 3 is made of resin and has a groove 8 having a V-shaped cross section for hanging the belt all around the side surface. A through hole 6 into which the rotary shaft 1 is inserted is formed in the center of the rotary pulley 3. The inside of the through hole 6 is step-like and is composed of a small diameter portion on the upper side and a large diameter portion on the lower side. The upper small diameter portion of the through hole 6 is press-fitted into the protruding portion of the rotary shaft 1 attached to the rotary yoke plate 2. The large diameter portion below the through hole 6 accommodates the protruding portion 2 a of the rotary yoke plate 2. A plurality of bosses 4 are formed on the lower surface of the rotary pulley 3, and the plurality of bosses 4 are fitted and fixed in the through holes 5 corresponding thereto. The dimensional relationship between the protruding size M of the boss 4 and the height L of the small diameter portion of the through hole 6 is M ≧ L. With such a dimensional relationship, when the rotary pulley is mounted on the rotary yoke plate 2 having the rotary shaft 1, the boss 4 and the through hole 5 are fitted and fixed to determine the relative positional relationship in the circumferential direction. Therefore, by fitting and fixing the small diameter portion of the through hole 6 to the rotary shaft 1, the center position of the rotary yoke plate 2 and the rotary pulley 3 can be obtained.

According to the rotary pulley of the motor as described above, the rotary pulley 3 is fixed to the rotary yoke plate 2 by fitting the boss 4 formed on the rotary pulley 3 into the through hole 5 of the rotary yoke plate 2. Therefore, when the rotary pulley 3 is fitted to the rotary yoke plate 2, reliability is improved without deterioration of quality due to creep and the like, and the contact area between the rotary pulley 3 and the rotary yoke plate 2 is increased. Therefore, a sufficient fixed strength can be obtained even if the size is reduced. Further, by fitting the boss 4 and the through hole 5 into each other, the rotary yoke plate 2 and the rotary pulley 3 can be surely aligned with each other. Furthermore, since the rotary pulley 3 is fixed at the upper end of the rotary shaft 1, the inclination of the rotary shaft 1 can be corrected. In order to obtain a further fixed strength, the portion of the boss 4 protruding from the back side of the rotary yoke plate 2 may be welded or may be pressed and crushed. Further, the rotating yoke plate 2 may be caulked at the root of the boss 4.

In the above embodiment, the boss 4 is formed on the rotary pulley 3, the through-hole 5 is formed on the rotary yoke plate 2, and the boss 4 is press-fitted into the through-hole 5. Was fixed to the rotary yoke plate 2. However, on the contrary, as in the embodiment shown in FIG. 3, the resin-made rotary pulley 13 has holes 15 having bottoms at a plurality of positions, and the surface of the rotary yoke plate 12 facing the rotary pulley 13 is formed. It is also possible to form a boss 14 corresponding to the hole 15 and press the boss 14 into the hole 15 to fix the rotary pulley 3 to the rotary yoke plate 2. The embodiment shown in FIG. 3 can also achieve the same effects as the embodiments shown in FIGS. In FIG. 3, reference numeral 11 indicates a rotary shaft, and 18 indicates a circumferential groove of the rotary pulley 13.

[0014]

[Effect of device]

 According to the present invention, a plurality of bosses are formed on one of the facing planes of the pulley and the rotating yoke plate, and the bosses are fitted and fixed to the facing pulleys or the rotating yoke plate to fix the pulley to the rotating yoke. Since it is fixed to the plate, reliability is improved without creeping on the pulley, and sufficient fixing strength can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a rotary pulley of a motor according to the present invention.

FIG. 2 is an exploded sectional view of the above embodiment.

FIG. 3 is a sectional view showing another embodiment of the rotary pulley of the motor according to the present invention.

FIG. 4 is an exploded cross-sectional view showing an example of a conventional rotary pulley of a motor.

[Explanation of symbols]

 1 rotating shaft 2 rotating yoke plate 3 rotating pulley 4 boss 11 rotating shaft 12 rotating yoke plate 13 rotating pulley 14 boss

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft, a rotary yoke plate that is inserted and fixed until the tip of the rotary shaft projects, and a center hole is fitted and fixed to the tip of the rotary shaft that projects from the rotary yoke plate. A rotary pulley of a motor that drives a belt by the rotary pulley, a plurality of bosses are formed on one of the opposing planes of the rotary pulley and the rotary yoke plate. A rotating pulley for a motor, which is fitted and fixed to the facing rotating pulley or the rotating yoke plate.