Design of speed box with transmission number Z = 18

Contents

1. Design Task

1.2 Development of kinematic diagram

1.2.1 Structural formula

1.2.2 Design versions of speed box

1.2.3 Kinematic versions of speed box

1.2.4 Optimal structure

1.2.5 Kinematic diagram

1.3 Structural Grid Construction

1.4 Structural Grid Analysis

1.4.1 Symmetry of beam arrangement

1.4.2 Compliance with optimum conditions

1.4.3 Optimum control range

1.5 Graph of box rotation speeds

1.6 Structural Plot Analysis (Speed Chart)

1.7 Determination of transfer ratios

1.8 Calculation of tooth numbers

1.9 Calculation of power parameters of the speed box, selection

electric motor

2 Design Part

2.1 Power calculation of speed box

2.1.1 Determination of transmitted power

2.1.2 Calculation of maximum torques on the box shafts

2.1.3 Design calculation of box shaft diameters

2.2 Calculation of gears

2.2.1 Calculation of permissible stresses

2.2.2 Design calculation of gears

2.3 Justification of kinematic calculation of the box

speeds

2.3.1 Check of condition of free switching of units

2.3.2 Check of deviation of actual speeds from

standard

2.4 Check calculation of gears

2.5 Calculation of gear wheel parameters

2.6 Shaft strength calculation

2.7 Spindle hardness calculation

2.8 Bearing Selection

2.9 Check of bearings for durability

2.10 Selection of keys and splines and their strength check

2.11 Description of speed box design

2.12 Feasibility Analysis

3 List of literature used

1.2 Development of kinematic diagram

The kinematic scheme must provide the simplest structure of the box, must meet the general requirements for speed boxes: minimum weight, minimum number of shafts and number of gears, etc.

Description of speed box design

The speed box mechanism is located in the housing, casting from gray cast iron. Rotation to the first shaft of the box is transmitted through the bushing clutch. The box consists of 4 shafts and a spindle. On the 1st shaft, a cylindrical gear is cantilevered, which is in constant engagement with the wheel on the second shaft. Movable units are based on splined engagement of shafts. Gear wheels 2, 3 and 4 of shafts transmit torques through keys. On the shaft 4 there is a gear on radial bearings, which is in constant engagement with the wheel of the fifth shaft. Torque is transmitted by means of elastic coupling. The use of the coupling is due to the significant dimensions of the gear and, if it moves, significant forces arise on the control handle.

Gear wheels of the spindle (fifth) shaft are made in the form of a block of wheels, transmission of torque to the spindle - by means of splined engagement.

Spindle supports are mounted in pinoles, which are capable of axial block movement by means of worm and rack engagement with the help of a moss. After setting of required axial position of pinol, it is fixed with screw clamp by means of wedge bushings.

Feasibility Analysis

The speed box developed meets the following performance indicators:

1) A structural grid with a fan-shaped structure is used, which provides minimum dimensions.

2) The number of parts is minimized, which improves the reliability of the box.

3) Increases productivity by using a single-handed control mechanism compared to others (drum type, etc.).

4) The controls are located with the maximum possible convenience for the worker. Their design is simple and reliable.

Z=18 свертка.cdw

КОРОБКА z=18.cdw