机械专业中英文翻译之轴和齿轮的介绍

之间有磁粉混合物润滑。

电磁线圈被装入磁路中的某处。

借助激励该线圈，

磁液混合物的剪

切强度可被精确的控 制。这样从充分滑移到完全锁住的任何状态都可以获得。

GEAR AND SHAFT INTRODUCTION

——

齿轮和轴的介绍

（中英文对

照

Abstract:

The important position of the wheel gear and shaft can't falter in traditional

machine and modern wheel gear and shafts mainly install the direction that delivers

the dint at the principal axis passing to process to make them can is divided into many

model numbers, useding for many situations we must be the multilayers to the

understanding of the wheel gear and shaft in many ways .

Key words:

Wheel gear;Shaft

In the force analysis of spur gears, the forces are assumed to act in a single plane. We shall

study gears in which the forces have three dimensions. The reason for this, in the case of helical

gears, is that the teeth are not parallel to the axis of rotation. And in the case of bevel gears, the

rotational axes are not parallel to each other. There are also other reasons, as we shall learn.

Helical gears are used to transmit motion between parallel shafts. The helix angle is the same

on each gear, but one gear must have a right-hand helix and the other a left- hand helix. The shape

of

the

tooth

is

an

involute

helicoid.

If

a

piece

of

paper cut

in

the

shape

of

a

parallelogram

is

wrapped around a cylinder, the angular edge of the paper becomes a helix. If we unwind this paper,

each point on the angular edge generates an involute curve. The surface obtained when every point

on the edge generates an involute is called an involute helicoid.

The

initial

contact

of spur-gear

teeth

is

a

line

extending

all

the way

across

the

face

of

the

tooth. The

initial

contact

of

helical

gear

teeth

is

a

point, which

changes

into

a

line

as

the

teeth

come into more engagement. In spur gears the line of contact is parallel to the axis of the rotation;

in helical gears, the line is diagonal across the face of the tooth. It is this gradual of the teeth and

the

smooth

transfer

of

load

from

one

tooth

to

another, which

give

helical

gears

the

ability

to

transmit

heavy

loads

at

high

speeds.

Helical

gears

subject

the shaft

bearings

to

both radial

and

thrust loads. When the thrust loads become high or are objectionable for other reasons, it may be

desirable

to

use

double

helical

gears.

A

double

helical

gear

(herringbone)

is

equivalent

to

two

helical

gears

of

opposite

hand,

mounted side

by side

on

the

same

shaft.

They

develop

opposite

thrust

reactions

and

thus

cancel

out

the

thrust

load.

When

two

or

more single

helical

gears

are

mounted on the same shaft, the hand of the gears should be selected so as to produce the minimum

thrust load.

Crossed-helical,

or spiral,

gears

are

those

in which the shaft centerlines

are

neither

parallel

nor

intersecting. The teeth of crossed- helical fears have point contact with each other, which changes

to line contact as the gears wear in. For this reason they will carry out very small loads and are

mainly

for

instrumental

applications,

and

are

definitely

not

recommended

for

use

in

the

transmission

of

power. There

is

on

difference

between

a crossed

helical

gear

and

a

helical

gear