Drawing of horizontal conical-cylindrical reduction gear for belt conveyor drive

Contents

Contents

1. Introduction

2. Terms of Reference

3. Kinematic calculation of the drive

4. Calculation of conical transmission

5. Cylindrical transmission calculation

6. Calculation of chain transmission

7. Calculation of gear box shafts

8. Check calculation of bearings

9. Check calculation of shafts

10. Fit Analysis

11. Choice of oil grade

12. Gearbox assembly

13. Conclusion

14. List of sources used

Introduction

In the national economy, various drive designs are widely used. A drive is an electric power device that drives a machine or mechanism. Drive consists of power source, transmission mechanism and control equipment. The source of energy is a motor (thermal, electrical, pneumatic, hydraulic, etc.) or a device that gives back previously stored energy (spring, inetization, weight mechanism, etc.). In some cases, the drive is carried out at the expense of muscle force (for example, in hand winches, in some counting, household and other mechanisms and machine arithmometers, sewing machines, bicycles).

By the nature of energy distribution, a group, individual and multi-engine drive are distinguished. In a group drive, movement from one engine is transmitted to a group of working machines or mechanisms through one or more transmissions. Due to technical imperfections, the group drive is almost supplanted by the individual. The drive, in which each working machine has its own drive with a transmission, allows you to operate at the most profitable speed, perform quick start and braking, and reverse. In a multi-engine drive, individual working elements of the machine are driven independently by the engine through its own transmission system. Such a drive allows you to obtain a compact machine design, use automatic control; it is used in complex metal cutting machines, rolling mills, lifting and transportation machines, etc.

The transition to servicing of machines (machine tools, forging and other equipment) with an individual and multi-engine drive made it possible to arrange working machines in the necessary sequence and prepare conditions for development in the mass production industry. The combination of the electric drive with the machine-gun made it possible to create stankiaviomats, and then automatic machine systems. Electric drive has also been widely used in communal and household services (sewing, kitchen machines, electric shavers). In the drive of transport vehicles, the leading role is retained for ICE (in cars, diesel locomotives, motor ships), gas turbines (in aircraft, gas turbines), nuclear power plants (on submarines, warships, icebreakers).

To drive a certain machine, a reduction gear is designed according to a given load (torque on the output shaft) and gear ratio without specifying a specific purpose. 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. 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 subjects of course design.

Choice of oil grade

To reduce friction power losses and wear intensity of friction surfaces, as well as to prevent them from jamming, gouging, corrosion and better heat removal, the friction surfaces of the parts must have reliable lubrication.

We use a crankcase method of lubrication.

When the wheel is rotated, oil spraying inside the housing forms a suspension of oil particles in the air, which are deposited on the inner walls of the housing, on the surface of the parts.

At contact voltages αNP = 540 MPa and a rate of v = 1, the viscosity of the oil should be approximately equal to 34 mm2/s. We accept industrial oil I-G-A-32

Bearings of high-speed and slow-speed shafts are lubricated with oil mist.

Gearbox assembly

Prior to assembly, inner cavity of reducer housing is thoroughly cleaned and covered with oil-resistant paint.

Assembly is carried out in accordance with the assembly drawing of the reduction gear box, starting from the shaft assemblies: bearings pre-heated in oil up to 80-100 0C are put on the driving shaft; shaft is installed in housing. Gear position is adjusted by set of washers.

Key 12x8x50 is put in driven shaft and gear wheel is pressed. Then spacer bushing is put on and bearings preheated in oil are installed.

The assembled shaft together with spacer rings and bearing covers are laid in the base of the reducer housing and the cover of the housing is put on, covering the joint place with "Sealant" paste. For alignment, a cover is installed on the body using two conical pins; screws that attach the cover to the housing are tightened.

Prior to installation of through covers reinforced gaskets are put into grooves. Check a provorachivaniye of shafts lack of jamming of bearings (shafts have to be turned by hand). Then plug of oil discharge hole with gasket is screwed in. Oil is poured into the housing and the inspection hole is closed with a cover-perfume.

The assembled gearbox is rolled and tested on the bench according to the program established by the technical requirements.

Conclusion

During the course project, I gained knowledge of the basics of design, acquired skills and knowledge of rules, design methods, using the example of designing a drive with a single-stage cylindrical reductor.

Summing up the results, it should be said that the calculations of gears according to such criteria as metal intensity, overall dimensions, processability, economic indicators and, of course, the arrangement of the drive makes it possible to make an optimal decision when choosing the type of gear box.