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Worm gear, worm reducer and method of manufacturing worm gear

A technology of worm gear and wheel disc, applied in the directions of gears, transportation and packaging, components with teeth, etc., can solve the problem of worm gear tooth spacing error and other problems, and achieve the effect of suppressing manufacturing errors

Active Publication Date: 2021-04-06
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a case, since the amount of molding shrinkage at the time of injection molding is different for each portion where the plurality of teeth 20, 20 are located (in a portion where the wall thickness in the radial direction is large (such as Figure 17 The α part) increases, in the radial part of the small wall thickness (such as Figure 17 β portion) decreases), therefore, the size of the plurality of teeth 20, 20 after molding will be different, which may cause manufacturing errors such as pitch errors in the worm gear tooth portion 19

Method used

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  • Worm gear, worm reducer and method of manufacturing worm gear
  • Worm gear, worm reducer and method of manufacturing worm gear
  • Worm gear, worm reducer and method of manufacturing worm gear

Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0118]byFigure 1 ~ 6 To illustrate the first embodiment of the present invention.

[0119]figure 1 A electric power steering device for assembling a worm gear unit with this embodiment is shown. Steering wheel 1 is installed in the rear end (refer toFigure 12 The front end portion of the steering shaft 2 is rotatably supported within the housing 3. A worm wheel 4a is fixed to a portion where the driven shaft 2 is rotationally driven. On the other hand, a worm shaft 6 is connected to the output shaft of the electric motor 5 (seeFigure 13 ). Further, by engage the worm teeth 18 provided at the outer circumferential surface of the axial intermediate portion of the worm shaft 6, the worm gear 19a provided on the outer peripheral surface of the worm wheel 4a is provided, it is possible to impart a predetermined direction from the electric motor 5 to the worm wheel 4a. A secondary auxiliary torque (auxiliary power).

[0120]The worm gear 4a corresponds to the axis of rotation described in the t...

no. 2 Embodiment approach

[0152]byFigure 7 ~ 8 To illustrate a second embodiment of the present invention.

[0153]In the case of the present embodiment, the second annular recess 38a provided in the axial side surface of the inner wheel disk element 15b constituting the worm wheel 4b constitutes the inner side surface of the inner surface of the second annular recess 38a. In the outer diameter side circumferential surface and the bottom surface (axial direction on the other side), the outer diameter side circumferential surface is inclined to the outer diameter side of the outer (one end portion and the intermediate portion) in the axial direction, and is provided in another The mutually axial end edge of the outer diameter side cylindrical face 40 of the side (the other end) is continuously formed. The outer diameter side inclined face 39 is a portion corresponding to the inclined face described in the technical solution, formed relative to the central axis of the inner wheel disk element 15b, as the axial di...

no. 3 Embodiment approach

[0165]byFigure 9 To illustrate the third embodiment of the present invention.

[0166]In the case of the present embodiment, the configuration of the first annular concave portion 22a disposed in the axial side surface of the inner wheel disk element 15c constituting the worm wheel 4c is different from the first embodiment described above. In the case of the present embodiment, the inner surface of the first annular recess 22a constitutes the respective plurality of recess 26a and the convex portion 27a of the first concave portion 23a of the outer diameter side surface, relative to the central axis of the worm wheel 4c. A state of being inclined in the opposite direction of the plurality of teeth 20a, 20a of the worm gear portion 19a provided on the outer circumferential surface of the outer wheel disk element 16c.

[0167]As in the case of the present embodiment, by the inclination direction of the plurality of teeth 20a, 20a of the worm gear portion 19a relative to the center axis of t...

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Abstract

A first concave-convex portion (23) is provided on the outer diameter side peripheral surface of the first annular recess (22) provided on one axial side of the inner wheel element (15a), and A second concave-convex part (49) is provided on the bottom surface of the second annular recess (38) provided on the other axial side. The outer peripheral surface of the inner roulette element (15a) is used as the cylindrical surface (24), and the outer peripheral portion of the inner roulette element (15a) is embedded in the outer roulette element (16a), and the outer roulette element (16a) is formed. ) part of the synthetic resin enters the plurality of concave portions constituting the first concave-convex portion (23) and the second concave-convex portion (49). This achieves a structure in which the manufacturing error of the worm wheel tooth portion provided on the outer peripheral surface of the outer wheel is suppressed while securing the holding force of the synthetic resin outer wheel element with respect to the metal inner wheel element.

Description

Technical field[0001]The present invention relates to a worm gear including a worm gear including a worm gear including a worm gear, a worm gear including a worm wheel, a worm gear including a worm gear, a worm gear including a worm gear, a worm gear including a worm gear, and a worm gear.Background technique[0002]Figure 12 ~ 17 An example of a conventionally known electric power booster device described in Patent Document 1 or the like is shown. The front end portion of the steering shaft 2 of the steering wheel 1 is mounted in the rear end portion is rotatably supported in the housing 3. A worm wheel 4 is fixed to the portion where the driven shaft 2 is rotationally driven. On the other hand, a worm shaft 6 is coupled to the output shaft of the electric motor 5. Further, by engaging the worm teeth 18 provided on the outer circumferential surface of the axial intermediate portion of the worm shaft 6, the worm gear 19 provided on the outer peripheral surface of the worm wheel 4 is e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H55/22B29C45/14B29C45/27F16H1/16F16H55/06
CPCB29C45/0046B29C45/14311B29C45/1459B29C45/2708B29C2045/2714B29L2015/00F16H1/16F16H55/06F16H55/22F16H2055/065B29K2705/00B62D5/0403B62D5/0409F16C19/36F16C2361/61
Inventor 清田晴彦山本武士安田要新井智浩高野纯一发田和喜
Owner NSK LTD