JPH10271752A - Output shaft support device for motor - Google Patents

Abstract

(57) [Problem] To provide an inexpensive and highly reliable motor output support device which is easy to assemble. SOLUTION: A pinion gear 7 is mounted on an output shaft portion 5c exposed from a shaft core hole of a gear case 3, and the pinion gear 7 is abutted by a push nut 6 and held between the gear case 3 so that the pinion gear 7 moves in the axial direction. Can be prevented,
High reliability can be realized at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output shaft supporting device for a motor having a worm gear.

[0002]

2. Description of the Related Art In recent years, efforts have been made to reduce the number of parts, share parts, and reduce machining and assembly steps in order to reduce the cost of motors.

A conventional motor output shaft supporting device will be described below with reference to FIGS. 3 and 4. FIG.

As shown in FIGS. 3 and 4, the worm wheel 1 meshes with the worm 2, the inner diameter is supported by a boss 3a of the gear case 3, and the worm wheel 1 is rotatable. The axial position is determined. Also, a plurality of ribs 1a radially from the inner diameter.
And is engaged with the slit 4 a of the damper 4. In the damper 4, a plurality of holes 4b are arranged on a surface opposite to the surface on which the slits 4a are provided, and a plurality of protrusions 5b arranged near the outer periphery of the flange surface 5a of the output plate 5 engage with the holes 4b. A part of the output shaft portion 5c protruding from the shaft portion of the flange surface 5a is exposed to the outside of the motor from a shaft hole in the boss 3a of the gear case 3, and a push nut 6 is mounted on the output shaft portion 5c. To engage with the equipment,
The pinion gear 7 is press-fitted to the output shaft 5c.

The operation of the above-described conventional structure will be described. The rotational torque transmitted to the worm wheel 1 via the worm 2 is applied to the damper 4 engaged with the rib 1a.
, And further transmitted to the output plate 5 engaged with the hole 4b of the damper 4. The worm wheel 1 generates a load in the axial direction when transmitting the rotational torque due to the helical gear. However, even if an axial load in a direction away from the gear case 3 is generated, the meshing position with the worm 2 is shifted, A push nut 6 is attached to the output shaft 5c of the output plate 5 so as not to come off, thereby preventing the worm wheel 1 from moving in the axial direction. When the external device is driven by a gear, the pinion gear 7 as the rotation transmitting device is press-fitted to the output shaft 5c.

[0006]

In such a conventional output shaft supporting device for a motor, when an external device is driven by a gear, the pinion gear 7 is only press-fitted to the output shaft portion 5c. When impact is repeatedly applied to the tooth surface of the pinion gear 7, the pinion gear moves in the axial direction, rattling occurs between the output shaft and the pinion gear 7, the pinion gear 7 comes off from the output shaft, or the pinion gear 7 Risk of breakage. Therefore, high reliability is required for the output shaft portion 5c.

The present invention has been made to solve the above-mentioned problem. Even if a repetitive shock load is applied to a rotation transmitting device, the rotation transmitting device does not move in the axial direction, and is located between the rotation transmitting device and the output shaft. It is an object of the present invention to provide an output shaft support device for a motor that does not cause rattling and is less likely to damage a rotation transmission device.

[0008]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention is to press fit a rotation transmission device for transmitting rotation to an external device to an output shaft portion of an output plate exposed from a shaft hole of a gear case. The push nut is brought into contact with the end face of the rotation transmitting device and mounted on the output shaft.

According to the present invention, since the rotation transmitting device is sandwiched between the gear case and the push nut, the load does not move in the axial direction even if the load is repeatedly applied to the tooth surface of the rotation transmitting device. A highly reliable output shaft support device for the motor can be obtained without rattling between the shaft and the rotation transmission device, and with little damage to the rotation transmission device.

[0010]

According to the first aspect of the present invention, a rotation transmitting device is mounted on an output shaft portion of an output plate exposed from a shaft hole of a gear case, and is brought into contact with an end face of the rotation transmitting device. Then, the push nut is attached to the output shaft part, so that even if a shocking and repetitive load is applied to the rotation transmission device, the rotation transmission device does not move in the axial direction and rattles to the rotation transmission device. It does not occur, and the rotation transmission device is hardly damaged.

Further, in the invention according to claim 2, the outer shape of the push nut is the same as the outer shape of the rotation transmitting device. Therefore, the push nut does not hinder the operation when engaging the external device with the rotation transmitting device. That is, the mounting workability to the external device driven by the rotation transmitting device is improved.

Further, the invention according to claim 3 uses a pinion gear as the rotation transmitting device, and the invention according to claim 1 or 2 can be implemented very easily by using the pinion gear.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same components as those of the conventional example shown in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a sectional view showing a motor output shaft supporting apparatus according to Embodiment 1 of the present invention. In FIG. 1, a worm wheel 1 meshes with a worm 2, and has an inner diameter supported by a boss 3a of a gear case 3 so as to be freely rotatable, and one side surface is in contact with the gear case 3 to determine an axial position. . Further, a plurality of ribs 1 a radial from the inner diameter are arranged, and are engaged with the slits 4 a of the damper 4. Damper 4 is slit 4
A plurality of holes 4b are provided on the surface opposite to the surface on which the “a” is provided, and a plurality of projections 5b provided near the outer periphery of the flange surface 5a of the output plate 5 facing the worm wheel 1 and the damper 4 are provided. Engage. A part of the output shaft portion 5c protruding from the shaft core portion of the flange surface 5a is exposed to the outside of the motor from a shaft hole in the boss 3a of the gear case 3.

The above configuration is the same as that of the conventional example shown in FIGS. The first embodiment is different from the conventional example in that a pinion gear 7 as a rotation transmitting device is brought into contact with the gear case 3 via a flat washer 8 and press-fitted, and furthermore, a push nut 6 is brought into contact with the outer end face of the pinion gear 7. That is, it is attached to the output shaft 5c. Therefore, even if the load is repeatedly applied to the tooth surface of the pinion gear 7 repeatedly, the pinion gear 7 does not move in the axial direction because the pinion gear 7 is sandwiched between the gear case 3 and the push nut 6. The output shaft supporting device for the motor can be realized with high reliability, in which rattling does not occur between the pinion gear 7 and the output shaft portion 5c and the pinion gear 7 is hardly damaged.

(Embodiment 2) FIG. 2 is a sectional view showing a motor output shaft supporting apparatus according to Embodiment 2 of the present invention. Example 2
However, the difference from the configuration of the first embodiment shown in FIG. 1 is that the outer shape of the push nut 6A is the same as that of the pinion gear 7.

By making the outer shape of the push nut 6A the same as that of the pinion gear 7, the push nut 6A engages the pinion gear 7 with an external device without interfering with the operation, thereby driving the external device. . That is, workability for transmitting rotation by engaging the pinion gear 7 with an external device is facilitated.

In the above description, an example in which the pinion gear is used as the rotation transmitting means has been described. However, the present invention can be similarly applied to a rotation transmitting apparatus having an external shape of a square or other shapes.

[0019]

As described above, according to the present invention, the pinion gear of the output shaft, which is the rotation transmitting means, is brought into contact with the gear case and the push nut and sandwiched therebetween, whereby the axial movement of the pinion gear can be prevented. An advantageous effect is obtained that a highly reliable and easily assemblable and inexpensive motor output shaft support device can be provided.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a main part of a main shaft supporting device for a motor according to a first embodiment of the present invention. FIG. 1B is a plan view of the output shaft and a push nut.

FIG. 2A is a sectional view of a main part of a motor output shaft support device according to a second embodiment of the present invention. FIG. 2B is a plan view of the output shaft portion and a push nut.

FIG. 3 is an exploded perspective view of a main part of a conventional output shaft support device for a motor.

FIG. 4 is a sectional view of a main part of an output shaft supporting device of the motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Worm wheel 2 Worm 3 Gear case 4 Damper 4a Slit 5 Output plate 5a Flange surface 5b Projection 5c Output shaft part 6, 6A Push nut 7 Pinion gear (rotation transmission device) 8 Flat washer

Claims (3)

[Claims] 1. A worm wheel in which rotational torque generated in an armature is transmitted via a worm disposed at a tip of an armature shaft, and a damper disposed coaxially with the worm wheel and a damper by the worm wheel. An output plate having an output shaft portion protruding from a shaft portion of a flange surface that receives rotational torque through the gear case; and a gear case, wherein the output shaft portion of the output plate exposed from a shaft hole of the gear case rotates to an external device. The rotation transmission device for transmitting the rotation transmission device is mounted, a push nut is mounted on the output shaft portion in contact with the end face of the rotation transmission device, and the rotation transmission device is sandwiched between the gear case and the push nut. Output shaft support device. 2. The output shaft supporting device for a motor according to claim 1, wherein the outer shape of the push nut is the same as the outer shape of the rotation transmitting device. 3. The motor output shaft supporting device according to claim 1, wherein the rotation transmitting device is a pinion gear.