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Worm wheel and worm speed reducer

A technology of worm reducer and worm gear, which is applied in the direction of gear transmission, belt/chain/gear, portable lifting device, etc. It can solve the problems of large molding shrinkage and spacing error, and achieve the effect of suppressing manufacturing errors

Active Publication Date: 2018-09-28
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a case, in each part where the plurality of teeth 20, 20 are located, due to the difference in molding shrinkage during injection molding [a part with a large radial wall thickness (such as Figure 30 The α part) has a large amount of molding shrinkage and a small radial wall thickness (such as Figure 30 The β portion) of the molding shrinkage is small], therefore, the size of the plurality of teeth 20, 20 after molding is different, which may cause manufacturing errors such as pitch errors in the worm gear tooth portion 19

Method used

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  • Worm wheel and worm speed reducer
  • Worm wheel and worm speed reducer
  • Worm wheel and worm speed reducer

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0120] pass Figure 1~6 The first embodiment of the present invention will be described.

[0121] figure 1 An electric power steering device equipped with the worm reducer according to the present embodiment is shown. Steering wheel 1 (refer to Figure 25 ) The front end portion of the steering shaft 2 is rotatably supported in the housing 3 . A worm gear 4a is fixed to a portion that is rotationally driven by the steering shaft 2 . On the other hand, a worm shaft 6 is connected to the output shaft of the electric motor 5 (refer to image 3 with Figure 26 ). Furthermore, by meshing the worm gear 18 provided on the outer peripheral surface of the axially intermediate portion of the worm shaft 6 with the worm gear 19a provided on the outer peripheral surface of the worm wheel 4a, the electric motor 5 can impart a predetermined magnitude to the worm wheel 4a in a predetermined direction. The auxiliary torque (auxiliary power).

[0122] The worm wheel 4 a is fitted and f...

no. 2 Embodiment approach

[0146] pass Figure 7 A second embodiment of the present invention will be described.

[0147] In the case of this embodiment, on the other axial side surface ( Figure 7 The right side) is also provided with an axial side with the inner wheel element 15b ( Figure 7 The ring-shaped concave portion 22a (inner diameter side cylindrical surface portion 33a, middle flat portion 34a) and concave-convex portion 23a (plurality of concave portions 26a, 27a) are arranged in the same manner as in the case of the left side surface of . Further, a part of the synthetic resin constituting the outer roulette element 16b is inserted into the radially outer end portion of the annular recess 22a, and the portion entered into the annular recess 22a is used as an annular restraining portion 31a. Accordingly, a part of the synthetic resin constituting the suppressing portion 31a enters the entirety of the plurality of concave portions 26a, 26a (the portions between the adjacent convex portions...

no. 3 Embodiment approach

[0150] pass Figure 8-9 A third embodiment of the present invention will be described.

[0151] In the case of this embodiment, not only on the outer diameter side peripheral surface constituting the inner surface of the annular recess 22 provided on one axial side surface of the inner disc element 15c constituting the worm wheel 4c, but also on the bottom surface constituting the inner surface. Concave-convex portion 23b is also provided on (one side in the axial direction). That is, in the case of this embodiment, in the continuous portion from the axial end edge of the outer diameter side peripheral surface constituting the inner surface of the annular recess 22 to the radial inner end edge constituting the bottom surface of the inner surface, Concave-convex portions 23b in which concave portions 26b and convex portions 27b are arranged alternately (equally pitched in the illustrated example) in the circumferential direction are provided. The plurality of concave portions...

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Abstract

According to the present invention, the outer end in the radial direction of an annularly-formed inner wheel element (15a) made of a metal, etc., is embedded in an annularly-formed outer wheel element(16a) which has worm wheel tooth parts (19a) on the outer circumferential surface thereof and which is made of a synthetic resin. The outer circumferential surface of the inner wheel element (15a) overlapping, in the radial direction, with sections at which the worm wheel tooth parts (19a) and worm tooth parts are engaged with each other, is defined as a cylindrical surface section (24). This configuration enables achievement of a structure in which manufacturing error of the worm wheel tooth parts to be engaged with the worm tooth parts can be inhibited.

Description

technical field [0001] The present invention relates to a worm wheel including an inner wheel element serving as a core material and a synthetic resin outer wheel element having teeth; and a worm reducer including the worm wheel. Background technique [0002] Figure 25-30 An example of a conventionally known electric power steering device described in Patent Document 1 and the like is shown. A front end portion of a steering shaft 2 to which a steering wheel 1 is attached is rotatably supported in a housing 3 . A worm gear 4 is fixed to a portion driven to rotate by the steering shaft 2 . On the other hand, a worm shaft 6 is connected to the output shaft of the electric motor 5 . Furthermore, by meshing the worm gear portion 18 provided on the outer peripheral surface of the axially intermediate portion of the worm shaft 6 with the worm gear tooth portion 19 provided on the outer peripheral surface of the worm wheel 4, the electric motor 5 can impart a predetermined magni...

Claims

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Application Information

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IPC IPC(8): F16H55/22F16H1/16F16H55/06
CPCF16H1/16F16H55/06F16H55/22F16H2055/065
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