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Ball screw and belt stepless variable speed devcie with same

A technology of belt-type continuously variable speed and ball screw, which is applied in the direction of transmission, friction transmission, transmission control, etc., can solve the problems that hinder the light weight and compactness of CVT, and the difficulty of optimal design, so as to achieve the purpose of suppressing lubricant The effect of scattering, increasing the effective length, and shortening the total length

Inactive Publication Date: 2003-05-28
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This poses a problem that it hinders the light weight and compactness of the CVT, making it difficult to perform a reasonable optimal design.

Method used

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  • Ball screw and belt stepless variable speed devcie with same
  • Ball screw and belt stepless variable speed devcie with same
  • Ball screw and belt stepless variable speed devcie with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] Below, according to Figure 1 ~ Figure 4 Embodiments of the present invention will be described in detail. figure 1 It is a longitudinal sectional view showing a CVT having a ball screw of the present invention.

[0035] In this CVT, a fixed pulley 2 and a movable pulley 3 around which a transmission belt 1 is wound are attached to a rotary shaft 4 so that respective belt receiving surfaces 2a, 3a face each other. By moving the movable pulley 3 linearly in the axial direction by the ball screw 5, the winding diameter of the conveyor belt 1 is continuously changed. Here, a structure in which the fixed pulley 2 and the rotary shaft 4 are integrally formed is exemplified, but a cylindrical portion extending toward the movable pulley 3 side on the fixed pulley 2 may be provided and fitted on the rotary shaft 4 .

[0036] The nut 7 integrally has a connecting portion 7b having a U-shaped cross section. The connection portion 7 b covers one end of the screw shaft 10 , res...

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PUM

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Abstract

There are provided a ball screw enabling the reduction of weight and size of a CVT without reduction of the transmission efficiency as well as a CVT in which the ball screw is incorporated. A CVT of the present invention comprises an axially immovable pulley half 2 and axially movable pulley half 3 both mounted on a rotary shaft 4, and the axially movable pulley half 3 being moved by a ball screw 20 so as to infinitely vary the belt wrapping radius and thus the transmission speed, and is characterized in that a nut 22 forming one part of the ball screw 20 is immovably secured both in axial and rotational directions, a screw shaft 21 forming the other part of the ball screw 20 is movable both in axial and rotational directions and connected to the axially movable pulley half 3, and the axially movable pulley half 3 is axially moved by rotating the screw shaft 21.

Description

technical field [0001] The present invention relates to a ball screw, and more particularly to a ball screw suitable for an actuator for driving a movable pulley of a belt-type continuously variable transmission (hereinafter referred to as CVT) such as an automobile. Background technique [0002] The ball screw is equipped with several balls between the helical thread groove provided on the outer peripheral surface of the screw shaft and the helical thread groove provided on the inner peripheral surface of the nut embedded on the screw shaft. Through the ball, the rotary power of the screw shaft (or nut) is converted into the thrust of the nut (or screw) shaft). [0003] Because the screw shaft and the nut of the ball screw are in rolling contact through the balls, the internal friction is small, and high transmission efficiency can be obtained. The driving torque is about 1 / 3 of the sliding screw, and the rotary motion can be converted into linear motion. . Therefore, a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H9/18F16C33/37F16H9/12F16H25/22F16H25/24F16H37/02F16H63/06
CPCF16C33/6696F16C33/3706F16H63/067F16C33/3713F16H25/2238Y10T74/19777F16H9/12
Inventor 吉田勇数野惠介
Owner NTN CORP
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