JPS62293950A - Gear motor - Google Patents

Abstract

PURPOSE:To enable gears to be positioned with high precision to a shaft without machining, by forming a positioning reference hole for setting the external ring of a ball bearing on a gear plate. CONSTITUTION:On a gear plate 8 fitted on a bracket 3, metal units 14, 15 and a stay 17 are arranged to constitute gears 10, 12. On a gear plate 16, a positioning reference hole 23 engaged with the metal units 14, 15, the stay 17, and the external ring of an upper bearing 4 is formed, and the metal units 14, 15 and the stay 17 are fitted on, and the stay 17 is fixed by caulked. The positioning reference hole 23 of the gear plate 16 is engaged with the bearing 4, and the gear plat 8 is fixed on the bracket 3 with screws. In this manner, machining for positioning the bracket 3 having a shaft 7 is not required, and a cost of positioning the gears with precision is not required.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention Industrial Application Field The present invention relates to a gear motor, and in particular, to a gear motor that is constructed by integrating a driving motor and a gear device that reduces the driving force, and This invention relates to a miniaturized gear motor.

Conventional technology Gear motors have traditionally been important in office equipment, etc., and are required to be highly accurate and inexpensive.However, conventional gear motors require a lot of machining, are expensive, and have poor accuracy. The current situation is that there is wide variation in quality.

Hereinafter, the conventional gear motor as described above will be explained with reference to the drawings.

FIG. 3 shows a cross-sectional view of a conventional gear motor. In Fig. 3, the motor section includes a bearing section consisting of a stator 1, an output side bracket 2, a non-output side bracket 3, an upper bearing 4, and a lower bearing 5, a rotor 6, and a shaft supported by the upper and lower bearings 4 and 5. The rotor section consists of 7 parts. The gear device includes a gear plate A8 fixed to the output side bracket 2, a gear A10 attached to the gear shaft 9, and a gear B12 attached to the output shaft 11.
, an intermediate gear 13 connecting gears 9 and 12, and an output shaft 10.
Metal 14 that supports the gear shaft 9, Metal 15 that supports the gear shaft 9
, gear plate B16. Gear plate A8 and gear plate B16 are fixed by a stay 17.

FIG. 4 is an exploded perspective view of a conventional gear motor, in which a gear plate 16 is engaged with an output side bracket 2.

Problems to be Solved by the Invention However, with the above configuration, it is difficult to achieve gear misalignment accuracy, that is, positioning accuracy of the center distance between the shaft 7 and the gear AIO, and the gear plate 16 of the output side bracket 2 It is expensive because the inner diameter part that engages must be machined and finished with high precision. Additionally, as gear motors become smaller, the control circuit is housed next to the gear case, which requires less space for positioning the gear device.

In view of the above-mentioned drawbacks, the present invention provides a gear motor that does not require the expense of positioning accuracy of a gear device and improves positioning accuracy.

Means for Solving the Problems In order to achieve this object, the gear motor of the present invention is a gear motor in which a drive motor and a gear device for decelerating the driving force are integrated, and a gear plate B of the gear device is provided. A positioning reference hole that engages with the bearing is provided in the
The outer peripheral surface of the outer ring of the bearing mounted on the bracket is engaged with a positioning reference hole in the gear plate of the gear device, and the outer ring of the bearing is used as a reference surface for positioning the gear device.

Function: With this configuration, the gear plate is formed with a positioning reference hole in which the outer ring of the ball bearing is placed, so that the gear device can be positioned with respect to the shaft axis with high precision.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

Note that functional parts that are the same as those in the conventional configuration will be described with the same reference numerals.

A drive motor consisting of a stator 1 and a rotor 6 has a stator yoke 17 fixed to a bracket 3 by screws B18, and a stator 1 to the stator yoke 17 by screws C19.
Fixed by On the other hand, the rotor boss 20 is fixed to the shaft 7 with a screw A21, and the rotor 6 is fixed to the rotor boss 20 with a screw D22.

The gear plate A8 attached to the bracket 3 is made of a steel plate, and has holes in which the metal A14 and metal B15 can be engaged, and a hole in which the stay 17 can be engaged. Gear plate A8, metal A14, metal B15
, and a stay 17 are arranged to constitute a gear AIO and a gear B12. Gear plate B16 is metal A14, metal B
15, a positioning reference hole 23 is formed in which the stay 17 and the outer ring of the upper bearing 4 can engage, metal A 14, metal B 15, and the stay 17 are attached, and the stay 17 is fixed by caulking. The positioning reference hole 23 in which the upper bearing 4 of the gear plate B16 of this gear device can be engaged is engaged with the upper bearing 4 of the motor section, and the gear device is fixed with the screw E24.

The positioning accuracy required for gear motors is 0°02~0.
．． An accuracy of 0.03+nm is required, and it is difficult to ensure the positioning accuracy required for the gear motor by machining. However, according to this embodiment, since the gear plate 16 is engaged with the upper bearing 4 and no machining is required, a highly accurate connection can be obtained, and the cost of gear positioning accuracy is not required. Cost reduction is possible.

As described above, according to this embodiment, machining for positioning the bracket 3 is not required, and since the gear plate B16 and the gear plate A8 are flat bodies, they can be formed with high precision in a short time by press working. We can provide high-precision, high-quality gear motors with significant cost reductions.

The operation of the gear motor configured as described above will be explained below. First, the driving force generated from the rotor 6 of the motor is transmitted to the shaft 7 through the rotor boss 20, and then transmitted from the gear at the tip of the shaft to the gear AIO.

Gear AIO is a two-stage gear, and the driving force is transmitted from the other gear to gear B12, and from the output shaft 11 erected on gear B12 to the outside.

Effects of the Invention As described above, the present invention allows a gear motor to be constructed at low cost and with high quality by providing a positioning reference hole for engaging a bearing outer ring in a gear plate, and has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a gear motor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, FIG. 3 is a sectional view of a conventional gear motor, and FIG. 4 is an exploded perspective view of a conventional gear motor. 1... Stator, 3... Bracket, 4
...Bearing, 6...Rotor, 7.
...Shaft, 8...Gear plate A,
10.12...Gear, 16...Gear plate B123...Positioning reference hole. ■ Q B

Claims (1)

[Claims] The drive motor is equipped with a gear device that reduces the drive force, and the drive motor includes a rotor, a stator, a shaft that transmits the drive force, a bearing that supports the shaft, and a bracket that supports the bearing. The device is composed of a flat gear plate A and a gear plate B, and a gear disposed between the two gear plates, and the gear plate B through which the shaft passes has a positioning reference hole that engages with the bearing. a gear motor, wherein an outer circumferential surface of the bearing mounted on the bracket is engaged with the positioning reference hole.