Construction and calculation of two-stage cylindrical reduction gear with drive

Contents

Contents

Introduction

1 Kinematic calculation

1.1.1 Drive output shaft power

1.1.2 Calculate the drive efficiency (efficiency)

1.1.3 Calculate the design power of the motor

1.1.4 Output shaft speed

1.1.5 Select the motor according to catalog [1, Table 17.7.1 and Table 17.7.2]

1.1.6 Calculate the actual gear ratio of the drive

1.1.7 Accept and calculate the actual number of drive gears

1.2.1 Calculate power and kinematic parameters of drive shafts

2. Calculation of chain transmission

3 Gearbox Calculation and Design

3.1 Calculation of transmissions

Calculation of oblique gear

3.1.1 Select the gear and gear material

3.1.2 Calculate allowable contact stresses

3.1.2.1 Calculate the base number of cycles corresponding to the endurance limit for the gear and gear [1, Fig. 4.1.1]

3.2.2.2 Calculate the equivalent number of cycles

3.1.2.3 Calculate the durability factor

3.1.2.4 Calculate contact endurance limit [1, Table 4.1.5]

3.1.2.5 Calculate allowable contact stresses

3.1.2.6 Calculate allowable contact stresses

3.1.3 Calculate allowable bending stresses

3.1.3.1 Calculate the bending endurance limit of teeth [1, Table 4.1.5]

3.1.4 Calculate allowable stresses under maximum load

3.1.4.1 Calculate allowable contact stresses under maximum load [1, Table 4.1.5]

3.1.4.2 Calculate allowable contact stresses under maximum load [1, Table 4.1.5]

3.1.5 Calculate the gear diameter and select the main transmission parameters

3.1.5.1 Calculate the design outside diameter of the gear

3.1.5.2 Gear rim width

3.1.5.3 Calculated axial distance

3.1.5.4 Taking z1l = 19, we determine the hooking module

3.1.5.5 Total number of gear teeth

3.1.5.6 Actual tooth angle

3.1.5.7 Calculate the number of teeth

3.1.5.8 Calculate the actual gear ratio

3.1.5.9 Calculate gear diameters

3.1.6 Check design contact stresses

3.1.6.1 Calculate the district force in engagement

3.1.6.2 Calculate the circumferential speed of the wheels

3.1.6.3 Determine the degree of accuracy [1, Table 4.2.14]

3.1.6.4 Determine the factor taking into account the dynamic load in the engagement [1, Table 4.2.7]

3.1.6.5 Determine the factor that takes into account load unevenness for simultaneously engaging pairs of teeth

3.1.6.6 Calculate the specific design district force

3.1.6.7 Calculate design contact voltage

3.1.7 Check design bending stresses

3.1.7.1 Determine the factor taking into account the dynamic load in the engagement [1, Table 4.2.7]

3.1.7.2 Determine a factor that takes into account the uneven distribution of load across the width of the rim (for flexural strength)

3.1.7.3 Determine a factor that takes into account the unevenness of load distribution for simultaneously engaging pairs of teeth

3.1.7.4 Calculate specific design circumferential force at bending

3.1.7.5 Determine equivalent number of teeth

3.1.7.6 Determine the factor taking into account the shape of the tooth [1, Fig. 4.2.5]

3.1.7.7 Calculate design tooth bending stresses

3.1.8 Calculate forces in gear wheel engagement

3.1.8.1 Calculate district forces

3.1.8.2 Calculate radial forces

3.1.8.3 Calculate axial forces

3.2.1 Select the gear and gear material

3.2.2 Calculate allowable contact stresses

3.2.2.1 Calculate the base number of cycles corresponding to the endurance limit for the gear and gear [1, Fig. 4.1.1]

3.2.2.2 Calculate the equivalent number of cycles

3.2.2.3 Calculate the durability factor

3.2.2.4 Calculate the limit of contact endurance [1, Table 4.1.5]

3.2.2.5 Calculate allowable contact stresses

3.2.2.6 Calculate allowable contact stresses

3.2.3 Calculate allowable bending stresses

3.2.3.1 Calculate the bending endurance limit of teeth [1, Table 4.1.5]

3.2.4 Calculate allowable stresses under maximum load

3.2.4.1 Calculate allowable contact stresses under maximum load [1, Table 4.1.5]

3.2.4.2 Calculate allowable contact stresses under maximum load [1, Table 4.1.5]

3.2.5 Calculate the gear diameter and select the main transmission parameters

3.2.5.1 Calculate the design outer diameter of the gear

3.2.5.2 Gear rim width

3.2.5.3 Calculated axial distance

3.2.5.4 Taking z1l = 19, we determine the hooking module

3.2.5.5 Calculate the number of teeth

3.2.5.6 Calculate gear diameters

3.2.5.7 Calculated axial distance

3.2.5.8 Calculate the actual gear ratio

3.2.6 Check design contact stresses

3.2.6.1 Calculate the district force in engagement

3.2.6.2 Calculate the circumferential speed of the wheels

3.2.6.3 Determine the degree of accuracy [1, Table 4.2.14]

3.2.6.4 Determine the factor taking into account the dynamic load in the engagement [1, Table 4.2.7]

3.2.6.5 Determine the factor that takes into account load unevenness for simultaneously engaging pairs of teeth

3.2.6.6 Calculate the specific design district force

3.2.6.7 Calculate design contact voltage

3.2.7 Check design bending stresses

3.2.7.1 Determine the factor taking into account the dynamic load in the engagement [1, Table 4.2.7]

3.2.7.2 Determine a factor that takes into account the non-uniformity of load distribution over the width of the rim (for flexural strength)

3.2.7.3 Determine a factor that takes into account the unevenness of load distribution for simultaneously engaging pairs of teeth

3.2.7.4 Calculate specific design circumferential force during bending

3.2.7.5 Determine equivalent number of teeth

3.2.7.6 Determine the factor taking into account the shape of the tooth [1, Fig. 4.2.5]

3.2.7.7 Calculate design tooth bending stresses

3.2.7.8 Check of teeth strength during G-loads

3.2.8 Calculate forces in gear wheel engagement

3.2.8.1 Calculate district forces

3.2.8.2 Calculate radial forces

3.2.8.3 Calculate axial forces

3.3 Calculation and design of shafts

3.3.1 Development of layout diagram

3.3.2 Design Shaft Calculation

3.3.2.1 Initial data

3.3.2.2 Define the paragraphs of the annex, directions and values of forces loading the shaft in the XOZ plane (Figure 3.2)

3.3.2.3 Calculate the reactions Rax and Rbx in the shaft supports A and B of the XOZ plane (Figure 3.2)

3.3.2.3 Calculate the bending moments at the characteristic points of the shaft with construction of the index of bending moments Mich (Figure 3.2)

3.3.2.4 Determine the paragraphs of appendix, directions and values of forces loading the shaft in YOZ plane (Figure 3.2)

3.3.2.5 Calculate Ray and Rby reactions in supports A and B of YOZ plane shaft (Figure 3.2)

3.3.2.6 Calculate bending moments at the characteristic points of the shaft with the construction of an epure of bending moments Miu (Figure 3.2)

3.3.2.7 Calculate the full cross reactions Ra and Rb in the shaft supports

3.3.2.8 Calculate the total bending moments Mi in the characteristic sections of the shaft with the construction of an epure of bending moments (Figure 3.2)

3.3.2.9 Representation of torques T transmitted by shaft (Figure 3.2)

3.3.2.10 Calculate the total bending moments of the Mackv characteristic sections of the shaft with the construction of an epure of bending moments (Figure 3.2)

3.3.2.11 We calculate the design diameters of the dash shaft of the characteristic sections of the shaft with the construction of an epure (Figure 3.2)

3.3.3 Check shaft 1 for fatigue strength

3.3.3.1 Calculate the safety factor of the shaft by normal stresses

3.3.3.2 Calculate the tangent voltage margin factor for non-revertive transmission

3.3.3.3 Calculate the total fatigue resistance margin

3.3.4 Design calculation of shaft

3.3.4.1 Initial data

3.3.4.2 Define the paragraphs of the annex, directions and values of forces loading the shaft in the XOZ plane (Figure 3.3)

3.3.4.3 Calculate the RGx and RDx reactions in the H and D shaft supports of the XOZ plane (Figure 3.3)

3.3.4.4 Calculate the bending moments at the characteristic points of the shaft with construction of the index of bending moments Mich (Figure 3.3)

3.3.4.5 Determine the paragraphs of appendix, directions and values of forces loading the shaft in YOZ plane (Figure 3.3)

3.3.4.6 Calculate reactions RGy and RDy in supports D and D of YOZ plane shaft (Figure 3.3)

3.3.4.7 Calculate bending moments at the characteristic points of the shaft with the construction of the era of bending moments Miu (Figure 3.3)

3.3.4.8 Calculate the full cross reactions of RG and RD in the shaft supports

3.3.4.9 Calculate the total bending moments Mi in the characteristic sections of the shaft with the construction of an epure of bending moments (Figure 3.3)

3.3.4.10 Representation of the torques T transmitted by the shaft (Figure 3.3)

3.3.4.11 Calculate the total bending moments of the Mackv characteristic sections of the shaft with the construction of an epure of bending moments (Figure 3.2)

3.3.4.12 We calculate the design diameters of the dash shaft of the characteristic sections of the shaft with the construction of an epure (Figure 3.2)

3.3.5 Check shaft 2 for fatigue strength

3.3.5.1 Calculate the safety factor of the shaft by normal stresses

3.3.5.2 Calculate the tangent voltage margin factor for non-revertive transmission

3.3.5.3 Calculate the total fatigue resistance margin

3.3.6 Design calculation of shaft

3.3.6.1 Initial data

3.3.6.2 Define the paragraphs of the annex, directions and values of forces loading the shaft in the XOZ plane (Figure 3.3)

3.3.6.3 Calculate the RGx and RDx reactions in the H and D shaft supports of the XOZ plane (Figure 3.3)

3.3.6.4 Calculate the bending moments at the characteristic points of the shaft with construction of the index of bending moments Mich (Figure 3.3)

3.3.6.5 Determine the paragraphs of appendix, directions and values of forces loading the shaft in YOZ plane (Figure 3.3)

3.3.6.6 Calculate reactions RGy and RDy in supports D and D of YOZ plane shaft (Figure 3.3)

3.3.6.7 Calculate bending moments at the characteristic points of the shaft with the construction of the era of bending moments Miu (Figure 3.3)

3.3.6.8 Calculate the full cross reactions of RG and RD in the shaft supports

3.3.6.9 Calculate the total bending moments Mi in the characteristic sections of the shaft with the construction of an epure of bending moments (Figure 3.3)

3.3.6.10 Representation of the torques T transmitted by the shaft (Figure 3.3)

3.3.6.11 Calculate the total bending moments of the Mackv characteristic sections of the shaft with the construction of an epure of bending moments (Figure 3.2)

3.3.6.12 We calculate the design diameters of the dash shaft of the characteristic sections of the shaft with the construction of an epure (Figure 3.2)

3.3.7 Check shaft 3 for fatigue strength

3.3.7.1 Calculate the safety factor of the shaft by normal stresses

3.3.7.2 Calculate the tangent voltage margin factor for non-revertive transmission

3.3.7.3 Calculate the total fatigue resistance margin

3.5 Selection and calculation of key connections

3.5.1 Key for sprocket landing

3.5.2 Key for landing of helical wheel

3.5.3 Spur Gear Landing Key

3.5.4 Key for coupling fit

3.6 Selection of lubrication method of gears and bearings, sealing devices

3.6.1 Calculate the volume of the oil bath

3.7 Determination of dimensions of housing parts

4 Selection and check calculation of couplings

4.1.1 Calculate the flexural strength condition of the finger

4.1.2 Calculate the condition of bushing crushing strength

5 Support Frame Design

5.1 Select channels [1, Table 15.2.3]

5.2 Transverse size of channel installation

5.3 Level difference between motor and reduction gear box support surfaces

5.4 Motor, gearbox and foundation bolts supports

6 Design of protective and other devices

7 Description of the principle of operation and assembly of the drive

8 Specification Development

List of sources used

Introduction

The design object in this course project is the conveyor drive.

The drive to the conveyor is designed to increase the traction capacity of the drive shaft and reduce its rotation speed.

Drive consists of electric motor, on shaft of which pulley is installed. Reduction gear box - cylindrical. Pulley is installed on drive shaft of reduction gear to connect shaft of reduction gear to electric motor. Coupling is installed on driven shaft.

Design of protective and other devices

In accordance with safety regulations, it is necessary to install protective devices on open rotating units of the mechanical drive. In our case, this is a coupling connecting the gearbox and the working machine. The protective device is made of sheet steel with a thickness of 1 mm. in the form of an open cylinder with a slot in the lower part. It is attached by means of special legs with bolts, which attach the covers of the bearings of the reduction gear box. The attachment legs are welded to the outer surface of the cylinder.

Description of the principle of operation and assembly of the drive

Principle of drive operation:

Rotation of reduction gear is transmitted from electric motor by means of coupling. In reduction gear, rotation from high-speed shaft to slow-speed shaft is transmitted by cylindrical helical and cylindrical spur gears. Speed of rotation from gear to gear is decreased, torque is increased.

Drive Assembly:

We install the frame and fix it using foundation bolts;

Install an electric motor and a reduction gear box connecting them with a clutch;

We install sprockets and pre-install the chain;

We tighten the chain to the required value.

Specification Development

The specification of the assembly drawing is made in accordance with GOST 2.10868, determines the composition of the gearbox and is necessary for its manufacture, picking design documents and planning for commissioning. It is performed on drawing paper of A4 format. On the first sheet, the specification places the title block in form 2; on subsequent sheets - in form 2a.

The specification of the assembly drawing of the drive device consists of four sections: documentation; assembly units; parts; standard products.

The name of each section is indicated as a title in the "Name" column and emphasized. After each section, it is recommended to leave 2-3 lines free for additional entries.

Documentation. This section contains the "Assembly Drawing" of the reduction gear box with open transmission elements.

Assembly units. Assembly units are products that are assembled outside the gearbox assembly and open transmission process, such as a wheel. The article is recorded in ascending order of the classification characteristic code of the assembly unit.

Details. Parts are the products on which the work drawings are developed. The parts shall be recorded in ascending order of the classification characteristic code of the part; within the class - subclass - group-subgroup - of the form.

Standard products. In the section "Standard products" they record products applied by state, industry and enterprise standards.

Within each category of standards, recording is made according to groups of products combined according to their functional purpose in alphabetical order; within each standard designation, in ascending order of basic parameters or product sections.