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Friction mechanism and gear motor

A friction mechanism and gear technology, applied in the direction of electric components, electromechanical devices, electrical components, etc., can solve the problems of reduced roundness, reduced strength, friction torque deviation, etc., and achieve the effect of stable resin flow and stable friction torque

Active Publication Date: 2018-04-13
SANKYO SEIKI MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When constituting the friction mechanism described in Patent Document 1, if a three-point gate type is used when forming a gear part by resin molding, there is a problem that a junction line is generated between the gate cut parts, so that there is a problem that the strength is lowered.
In addition, if the three-point gate molding is used, the flow of the resin is unstable, so there is also a problem that the roundness of the inner peripheral surface of the main body that is in sliding contact with the rotating member decreases, and the friction torque tends to vary.

Method used

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  • Friction mechanism and gear motor
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  • Friction mechanism and gear motor

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Experimental program
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Effect test

Embodiment approach 1

[0059] (the whole frame)

[0060] Figure 1(a) ~ Figure 1(c) It is an explanatory diagram of a gear motor according to Embodiment 1 of the present invention, and FIG. 1( a ), FIG. 1( b ), and FIG. An expanded view showing the meshing state of the gears in a gear set.

[0061] In FIG. 1( a ), FIG. 1( b ), and FIG. 1( c ), the geared motor 1 to which the present invention is applied includes a motor part 2 having a stepping motor structure, and the motor part 2 is briefly composed of a stator 4 and a rotor 3 . The stator 4 has two stator groups 4a, 4b arranged overlappingly in the axial direction S of the motor, and in the stator groups 4a, 4b, the outer stator core 41 and the inner stator core 42 are arranged opposite to each other in the axial direction S of the motor. mode configuration. Both the outer stator core 41 and the inner stator core 42 have an annular flange portion and pole teeth bent from the inner peripheral edge of the flange portion toward the motor axis dire...

Embodiment approach 2

[0095] Figure 5(a) ~ Figure 5(d) It is explanatory drawing of the gear member 92 used for the friction mechanism 9 of the geared motor 1 concerning Embodiment 2 of this invention, FIG. 5(a), FIG. 5(b), FIG. 5(c), FIG. 5(d) These are a plan view and a side view of the gear member 92 viewed from the output side S1 , and an exploded view and a cross-sectional view of the gear member 92 viewed from the opposite output side S2 . In addition, since the basic configuration of this embodiment and Embodiments 3 and 4 described later is the same as that of Embodiment 1, common parts are shown with the same reference numerals, and descriptions of these parts are omitted.

[0096] Figure 5(a) ~ Figure 5(d) The gear member 92 shown is also a resin molded product such as PBT, as in the first embodiment. In the present embodiment, when the gear member 92 is formed, as shown in FIG. , the second annular end surface 925 faces the opposite output side S2 in the direction S of the motor axi...

Embodiment approach 3

[0099] Figure 6(a) ~ Figure 6(d) It is explanatory drawing of the gear member 92 used for the friction mechanism 9 of the geared motor 1 concerning Embodiment 3 of this invention, FIG. 6(a), FIG. 6(b), FIG. 6(c), FIG. 6(d) These are a plan view and a side view of the gear member 92 viewed from the output side S1 , and an exploded view and a cross-sectional view of the gear member 92 viewed from the opposite output side S2 .

[0100] Figure 6(a) ~ Figure 6(d) The gear member 92 shown is also a resin molded product such as PBT, as in the first embodiment. In the present embodiment, when the gear member 92 is formed, as shown in FIG. The middle position of is close to the end 923b side of the output opposite side S2. Therefore, as shown in FIG. 6( b ), in the gear member 92 , the ring gate cut portion G0 exists at the end portion of the outer peripheral surface 923 r of the main body portion 923 on the opposite output side S2 than the middle position in the motor axis direct...

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Abstract

Disclosed are a friction mechanism and a gear motor having the friction mechanism, capable of suppressing reduction in strength and variation in friction torque due to merging lines even when a gear member is formed by resin molding. The friction mechanism (9) includes a gear part (92) forming a gear part (926) on a cylindrical body part (923) extending along the motor axis direction (S), and a rotating part having a plurality of elastic deformation parts (915). (91) and an urging member (93) that urges the elastic deformation portion so that the elastic deformation portion elastically contacts the inner peripheral surface (923p) of the main body. When the gear part is molded with resin, the annular gate is arranged in the mold at a position other than the part where the gear part (926) and the inner peripheral surface (923p) are formed. Therefore, the ring gate cutting portion exists at a position other than the gear portion and the inner peripheral surface (923p) of the gear member.

Description

technical field [0001] The present invention relates to a friction mechanism provided in a gear train or the like, and a gear motor having the friction mechanism. Background technique [0002] In geared motors, etc., as a friction mechanism for protecting the gears used in the gear train and the motor, it has been proposed to elastically contact the elastically deformable portion of the rotating member with the inner peripheral surface of the cylindrical body portion of the gear member by means of a biasing member. structure (refer to Patent Document 1). [0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2010-78009 [0004] When constituting the friction mechanism described in Patent Document 1, if a three-point gate type is used when forming a gear part by resin molding, there is a problem that a junction line is generated between the gate cut portions, thereby reducing strength. In addition, if the three-point gate molding is used, the flow of the res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D7/02F16D43/21H02K7/108
Inventor 大岛勇太
Owner SANKYO SEIKI MFG CO LTD