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Course Design "Cylindrical Gearbox Design"

  • Added: 22.04.2015
  • Size: 2 MB
  • Downloads: 0
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Description

Course project. Design of cylindrical reduction gear box. Subject: Copromat, Theoretical mechanics.

Project's Content

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Additional information

Contents

Contents

Introduction

I. Motor selection and kinematic calculation

II. Gearbox Gear Calculation

III. Preliminary calculation of gear box shafts

IV. Gear and Wheel Design Dimensions

V. Gearbox housing structural dimensions

VI.First stage of gearbox arrangement

VII Bearing Life Check

VIII. Second stage of gearbox layout

iX. Test of key joints strength

X. Refined shaft calculation

XI.. SPECIFICATION

XII. Gear and Bearing Fit

XIii. Choice of oil grade

XiV. Gearbox assembly

List of literature

Introduction 

A reduction gear is a mechanism consisting of gear or worm gears, made in the form of a separate unit and serving to transfer rotation from the shaft of the engine to the shaft of the working machine. The kinematic drive circuit may include, in addition to the gearbox, open gears, chain or belt gears. These mechanisms are the most common subject of course design.

        The purpose of the reduction gear is to reduce the angular speed and, accordingly, increase the torque of the driven shaft compared to the driving one. Mechanisms for increasing angular velocity, made in the form of separate aggregates, are called accelerators or multipliers.

         The reduction gear consists of a body (cast iron or welded steel), in which gear elements are placed - gears, shafts, bearings, etc. In some cases, a gear oil pump or a cooling device (for example, a coil with cooling water in the housing of the worm gear) is also placed in the reduction gear case.

         The reduction gear is designed either to drive a certain machine, or to a given load (torque on the output shaft) and gear ratio without specifying a specific purpose. Gearboxes are classified according to the following main features: gear type (toothed, worm or gear-worm); number of stages (single-stage, two-stage, etc.); to type of cogwheels (cylindrical, conic, konicheskotsilindrichesky, etc.); relative location of gear box shafts in space (horizontal, vertical); features of the kinematic scheme (unfolded, coaxial, with a bifurcated stage, etc.).

In       this task, we will consider the design of a horizontal cylindrical gearbox.

  

I. Motor selection and kinematic calculation

The most widespread in industry were three-phase asynchronous motors with a short-circuited rotor. These engines are simple in design and maintenance, reliable in operation, have a small cost.

The calculation of the drive begins with the determination of the total efficiency of the kinematic circuit, the total gear ratio and the selection of the electric motor.

II. Gearbox Gear Calculation

Material Selection and Heat Treatment

  Since there are no special requirements for transmission dimensions in the task, we choose materials with medium mechanical characteristics :

for gear: steel 45, heat treatment - improvement, hardness HB 230; for the wheel - steel 45, heat treatment - improvement, hardness HB 200. 

VIII. Second stage of gearbox layout

The second stage of the layout is aimed at structurally formalizing gear wheels, shafts, housing, bearing units and preparing data for checking the strength of shafts and some other parts.

The order in which the build is executed is as follows. Draw the gear and wheel according to the structural dimensions found earlier [see item IV]. Gear is made integral with shaft.

We construct the drive shaft assembly:

and a    ) applying axial lines remote from the middle of the gearbox by a distance l1. Using these centerlines, draw rolling bearings in section;

    b) between end faces of bearings and inner surface of housing wall, draw retaining rings [see arrangement]. Their ends must protrude 1-2 mm inside the housing, from the inner wall. Then these rings will simultaneously play the role of oil of the discarding rings. To reduce the number of stages of the shaft, the rings are set to the same diameter as the bearings ( Ø and mm ). Their fixation in axial direction is performed by shaft shoulders and ends of internal rings of bearings;

    c) draw bearing covers with sealing gaskets (thickness ~ 1 mm) and bolts. The bolt is conditionally inserted into the drawing plane, as evidenced by a break-out on the parting plane.

Felt and felt seals are used mainly in assemblies filled with: plastic grease. Cuff-type seals are widely used in both plastic and liquid lubricants;

  d) the transition of the shaft Ø  and mm to the connecting end Ø and mm is made  at a distance of 10-15 mm from the end of the bearing cover so that the coupling hub does not grip the heads of the cover attachment bolts.

The length of the connecting end of the shaft   Ø and mm is determined by the length of the coupling hub.

  Similarly, we construct a driven shaft assembly. 

On the driving and driven shafts we use prismatic keys with rounded ends as per GOST 2336078. Draw keys, taking their length 5-10 mm less than the lengths of the hubs.

.

 iX. Test of key joints strength

Prismatic keys with rounded ends. Dimensions of sections of keys and slots and length of keys - as per GOST 2336078 [1, p. 169]. Key material - 45 normalized steel.

Drawings content

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