Reduction gear box with vertical kinematic diagram

Contents

Source Data

Construction Description

1 DETERMINATION OF BASIC KINEMATIC AND ENERGY PARAMETERS OF REDUCTION GEAR

1.1 Determination of gearbox efficiency

1.2 Determination of required electric motor power

1.3 Selection of electric motor

1.4 Determination of gear ratio

1.5 Determination of gear wheel speeds and torques on gear box shafts

2 CALCULATION OF GEARS

2.1 Selection of gear material

2.2 Determination of allowable contact stresses

2.3 Determination of allowable bending stresses

2.4 Low-speed transmission design calculation

2.4.1 Determination of low-speed transmission inter-axial distance

2.4.2 Transmission Module Assignment

2.4.3 Determination of gear and gear numbers of low-speed stage

2.4.4 Correction of gear ratio

2.4.5 Determination of basic geometrical dimensions of gear and wheel

2.4.6 Determination of forces in engagement

2.5 Check of low-speed gear teeth for endurance by contact stresses

2.6 Check of low-speed transmission wheels by bending stresses

2.7 Design calculation of high-speed transmission

2.7.1 Determination of axial distance

2.7.2 Purpose of high-speed transmission module

2.7.3 Determination of speed gear teeth numbers

2.7.4 Correction of gear ratio

2.7.5 Determination of basic geometrical dimensions of gear and wheel

2.7.6 Determination of forces in engagement

2.8 Check of fast gear teeth for endurance by contact stresses

2.9 Special lubricating wheel

3 DESIGN DESIGN OF GEARBOX

3.1Compute shafts. Selection of bearings

3.2The distance between the gear parts

3.3Gearbox layout

3.4Structure of gear wheel components

3.5Compute shaft-hub connection

3.6Selection of lubrication method of friction surfaces of reduction gear box and seals

4 CHECK CALCULATION OF INTERMEDIATE SHAFT

4.1Installation Data, Design Shaft Scheme Selection

4.2Determination of support reactions, bending and torques

4.3Shaft static strength check

4.3.1For section 1 - 1: section of shaft with key slot

4.3.2For section 2 - 2: stepped transition with fillet

4.4Check the intermediate shaft for fatigue strength

4.4.1For section 1 - 1: section of shaft with key slot

4.4.2For section 2 - 2: stepped transition with fillet

5 CALCULATION OF INTERMEDIATE SHAFT BEARINGS FOR DURABILITY

5.1From Data

5.2Development of bearings

LIST OF LITERATURE USED

Construction Description

Reduction gear consists of cast case with cover and undercarriage. The case is cast from SCh15 cast iron in accordance with GOST 141279.

The gearbox is designed to transmit 7.5 kW of power, provides an output moment of 707.1 Nm at a frequency of 85 rpm, while the resource must be at least 12000 hours. Gear ratio of the gearbox is 17.0.

Housing is made detachable along shafts axes and consists of base, intermediate housing and cover. Main housing, intermediate housing and cover are fixed relative to each other by bolts and cylindrical pins installed without clearance. Attachment of the housing to the floor is provided by 4 M18 bolts. To increase stiffness, there are stiffeners on the body.

Undercarriage of reduction gear consists of input shaft, intermediate shaft, output shaft and two gears. The entire undercarriage is made of a single material - 40X steel. For the active surface of the teeth as a surface hardening, thermal treatment is used to improve and quench the TF.

The wheels are stamped.

Bearing covers - end face. Cuffs are used as sealant in covers with hole.

Gearbox lubrication system - crankcase, oil used

I-G-A-68.

In order to remove contaminated oil and to wash the reducer, a plug hole is provided in the lower part of the housing. To drain oil, the bottom of the crankcase is made at an angle of 1-2 fr. To control the oil level, a iron oil indicator is used.

Eyes are provided for ease of lifting and transportation of housing cover and reduction gear box.

2 calculation of gears

2.1 Selection of gear material

For gears of the designed reduction gear the material 40X is adopted (the same for all wheels), as a technological hardening of the active surface of the teeth, thermal treatment and hardening of the HF are used. In this case, the material will have the following mechanical characteristics/1/: hardness of the core of the gear and wheel: 269... 302 HB,

hardness of gear and wheel teeth surface: 48... 52 HRC.