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Mechanism for converting rotary motion into linear motion

A technology of linear motion and revolution, applied in the direction of mechanical equipment, transmission devices, belts/chains/gears, etc., can solve the problems of the upper limit of transmission force and the inability to carry linear motion output, etc., and achieve the effect of large thrust

Inactive Publication Date: 2010-05-05
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Therefore, the ball screw mechanism of the prior art has an upper limit in the actual application of the transmission force. Therefore, the power steering device using this mechanism cannot be equipped with the required linear motion output (rack thrust) on a relatively large vehicle. The problem

Method used

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  • Mechanism for converting rotary motion into linear motion
  • Mechanism for converting rotary motion into linear motion
  • Mechanism for converting rotary motion into linear motion

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Experimental program
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no. 1 approach

[0049] For the rotary linear motion conversion mechanism related to the embodiment of the present invention, refer to Figure 1 to Figure 23 Describe in detail. First, based on Figure 1 to Figure 15 , Figure 21 and Figure 22 A first embodiment of the present invention will be described. The above-mentioned first embodiment is a rack assist type electric power steering apparatus in which the present invention is applied to an automobile.

[0050] figure 1 is a longitudinal sectional view of the rack assist mechanism of the electric power steering device according to the first embodiment of the present invention, figure 2 It is to figure 1 A schematic diagram of the revolving rollers on the front side arranged in a normal posture, image 3 is the side view of the entire revolving roller, Figure 4 is a side view of the assembly of the orbiting roller and the support member, Figure 5 is a cross-sectional view of that same component. in addition, Figure 21 is a sch...

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PUM

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Abstract

Revolving rollers, each provided on an outer peripheral surface thereof with revolving roller grooves extending therearound, are caused to mesh with a rack rod thread of a central rack rod with an axial angle over a lead angle of the rack rod thread and arranged for rotation on a holder member to be twisted. The holder member is rotated round the rack rod by a motor to translate the rack rod. A large thrust can be generated while ensuring a high reliability since a high efficiency is achieved by realizing rolling contact in set points of mesh of the rack rod thread and the revolving roller grooves, points of mesh are made planar, and interference in other points than the points of mesh can be suppressed. Also, play can be restricted by assembling the revolving rollers to the rack rod thread while applying torque in a direction, in which the axial angle is increased.

Description

technical field [0001] The present invention relates to a rotary linear motion conversion mechanism that converts torque and thrust by changing the direction of motion between rotary motion and linear motion, especially relates to a large thrust, high reliability, small gap, and high efficiency suitable for power steering devices Rotary linear motion transformation mechanism. Background technique [0002] First, an outline of a general technology of a power steering device for an automobile will be described. Figure 21 It is a rack and pinion steering mechanism that has become mainstream in automobiles. Its main structural elements are a steering wheel 101, a steering column 102 as its axis of rotation, a pinion 103 provided at its lower end, a rod (rod) provided with a rack meshing with the pinion (usually called the rod itself rack, but in order to avoid confusion in the present invention, it is referred to as a rack rod (rack rod) hereinafter, and the symbol number is s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H25/20
CPCF16H25/2252
Inventor 坪野勇山门诚须藤幸雄
Owner HITACHI LTD