JPH05184102A - Gear motor - Google Patents

Abstract

PURPOSE:To obtain an inexpensive long-life gear motor by arranging the parts of a large diameter for the provision of lubricating oil reservoirs on the ends positioned on the side where the inner diameter parts of the gear shafts of plastic gears are fixed. CONSTITUTION:In the gear head 1 of a gear motor, gear shafts 3, 4, and 5 are fixed to a bracket 2. To the gear shafts, plastic gears 6, 7, and 8 are rotatively fitted to reduce the rotation of a motor pinion and transmit it to an output gear 10. The inner diameters of the plastic gears are arranged to be bearings, and on the bracket-side ends of the inner diameters 14 for the bearing use, large diameter parts 17 are provided for the lubricating oil reservoirs 11, 12, and 13. Inclined parts 15 are made for the bearing spaces to receive the lubricating oil by the application of capillary phenomenon. Also, the dimension of space for the lubricating oil reservoir is defined to be the one longitudinally and transversely such that the lubricating oil can be retained in the reservoir by the capillary phenomenon and no flowing out occurs. Then, when assembling, the plash gears are fitted after the lubricating oil is applied to the gear shafts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear motor, and more particularly to a small gear motor using a plastic gear with low noise.

[0002]

2. Description of the Related Art Small gear motors using plastic gears are widely used because they have the advantages of low noise and low cost. However, it has a big drawback that the load capacity is small and the life is short. Generally, in a small gear motor using a plastic gear, the inner diameter portion of the plastic gear is used as a bearing, but this method has the drawback that the bearing portion is inexpensive but wear is large and the life is short.

[0003]

SUMMARY OF THE INVENTION The present invention seeks to overcome the deficiencies of the prior art and provide an inexpensive and long life gear motor.

[0004]

The above object can be achieved by providing a lubricating oil sump by providing a large diameter portion at the end of the plastic gear on the side where the gear shaft is fixed.

[0005]

[Operation] By providing the lubricating oil sump at the above position,
Lubricating oil is reliably retained by the capillary phenomenon and is replenished in the bearing gap, so the life can be greatly extended.

[0006]

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

FIG. 1 is a vertical sectional view of a gear motor according to the present invention. In the figure, reference numeral 1 denotes a gear head, to which gear shafts 3, 4, and 5 are fixedly attached to a bracket 2, and plastic gears 6, 7 and 8 which are the features of the present invention are rotatably fitted to the gear shaft, and The rotational force is reduced and transmitted to the output gear 10. The plastic gear has a bearing at its inner diameter portion, but as shown in FIGS. 2 and 3, a large diameter portion 17 is provided at the end portion on the bracket side with respect to the bearing inner diameter portion 14 so that the lubricating oil sumps 11, 12 are formed. , 13 are provided.

Reference numeral 15 is an inclined portion for allowing the lubricating oil to be replenished from the lubricating oil reservoir to the bearing gap by the capillary phenomenon. The dimensional relationship of the space forming the lubricating oil sump is set to a vertical and horizontal dimensional relationship in which the lubricating oil is held in the lubricating oil sump by the capillary phenomenon and no outflow occurs. The invention according to claim 2 is for an application requiring a larger amount of lubricating oil. As shown in FIGS. 4 and 5, a plurality of fins 16 are provided in the lubricating oil sump to divide the lubricating oil sump into small chambers. Then, the capillary phenomenon is utilized to retain more lubricant oil. Further, when the plastic gear is assembled, as shown in FIG. 6, when the plastic gear is inserted after first applying the lubricating oil 16 to the gear shaft, the lubricating oil reservoir is provided on the bracket side. Can be stored in a puddle. Reference numeral 18 is a drive motor, 19 is an output shaft, and 20 is a bracket cover.

According to the embodiment of the present invention having the above construction, the life time can be extended three times or more as compared with the prior art without changing the size and cost.

[0010]

As described above, according to the present invention, since an effective lubricating oil sump utilizing the capillary phenomenon is provided in an extremely small space, the life time can be greatly extended and the life variation can be reduced. The present invention has a great practical effect such as being able to expand the range of applications of a gear motor that uses an inexpensive and low-noise plastic gear.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a gear motor according to the present invention.

FIG. 2 is a vertical sectional view of the plastic gear according to claim 1.

FIG. 3 is a side view of FIG.

FIG. 4 is a vertical sectional view of a plastic gear according to a second aspect of the present invention.

FIG. 5 is a side view of FIG.

FIG. 6 is an assembly diagram of a plastic gear.

[Explanation of symbols]

2 ... Bracket, 6, 7, 8 ... Plastic gear, 3,
4, 5 ... Gear shafts, 11, 12, 13 ... Lubricating oil sump, 17
… Large diameter part.

Claims (2)

[Claims] 1. A gear motor comprising a plastic gear, a gear shaft for supporting the plastic gear, a bracket for fixedly supporting the gear shaft, and a drive motor. A bearing portion is formed by the inner diameter portion of the plastic gear and the gear shaft. In addition, the gear motor is characterized in that, in the inner diameter portion of the plastic gear, a large diameter portion is provided at the end portion located on the bracket side where the gear shaft is fixedly fixed, and a lubricating oil reservoir is provided. 2. The gear motor according to claim 1, wherein a plurality of fins are radially provided on a large diameter portion provided at an inner diameter end portion of the plastic gear to divide the lubricating oil sump into small chambers. Gear motor to.