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Worm gear and electric power steering

A worm gear and axial technology, which is applied in the field of electric power steering devices, can solve problems such as inability to ensure durability, and achieve the effects of improving strength and rigidity, ensuring durability, and suppressing looseness

Active Publication Date: 2017-03-29
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

exist Figure 11 and Figure 12 In the case of the worm wheel 4a shown, the strength of the coupling portion between the hub portion 11 and the gear portion 12 is not necessarily sufficient for the moment M. Electric power steering with assist torque may not ensure sufficient durability

Method used

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  • Worm gear and electric power steering
  • Worm gear and electric power steering
  • Worm gear and electric power steering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] The first example of embodiment

[0042] Figure 1 to Figure 3 The first example of the embodiment of the present invention is shown. In addition, this example is characterized in that the structure of the joint is designed to increase the strength and rigidity of the joint between the metal hub 11a and the synthetic resin gear 12a constituting the composite worm wheel 4b. The structure and function of other parts and Figure 11 with Figure 12 The worm gears of the shown structures are the same, so the same reference numerals are assigned to the same parts, and repeated descriptions are omitted or simplified, and the following description will focus on the characteristic parts of this example.

[0043] In the structure of this example, in addition to the axial side of the hub portion 11a ( Figure 1 to Figure 3 In addition to the first annular recess 15 on the left side of the hub portion 11a, the other axial side of the hub portion 11a ( Figure 1 to Figure 3 rig...

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PUM

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Abstract

The present invention realizes a worm gear structure capable of sufficiently increasing the strength of the junction of the hub portion (11a) and the gear portion (12a), even when applied to an electric power steering that imparts a large assist torque Even in the case of the device, sufficient durability can be ensured. The gear part (12a) made of synthetic resin is molded on the outer diameter side end part of the hub part (11a) made of metal. A first annular recess (15) is provided on one axial side of the hub (11a), and a second annular recess (22) is provided on the other axial side. In addition, a part of the synthetic resin constituting the gear part (12a) enters the outer diameter parts of the first annular recess (15) and the second annular recess (22) to form the first pressing part (18) and the second pressing part (18). Pressing part (23). The pressing portion (18, 23) is used to press the outer diameter side end portion of the hub portion (11a), thereby improving the strength and rigidity of the joint portion between the hub portion (11a) and the gear portion (12a).

Description

technical field [0001] The present invention relates to a worm wheel constituting a worm gear reducer and an electric power steering device incorporating the worm wheel. Background technique [0002] As a device for reducing the force required to operate the steering wheel when imparting a steering angle to the steering wheels of an automobile (except for special vehicles such as forklifts, usually the front wheels), electric motors are widely used as auxiliary power sources electric power steering device. Electric power steering apparatuses of various structures are known. In any structure, the auxiliary power of the electric motor is supplied to the rotating shaft through the speed reducer, and the rotating shaft is rotated by the operation of the steering wheel. As this type of reducer, a worm gear reducer is generally used. In the case of an electric power steering system using a worm gear reducer, a worm driven to rotate by an electric motor meshes with a worm wheel t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H55/06B62D5/04F16H55/22
CPCB62D5/0409F16H55/22F16H2055/065Y10T74/19921B62D5/0454F16H55/06
Inventor 清田晴彦山本武士三津桥史朗小木健太郎
Owner NSK LTD