MEC2304: Solid Modelling - Pumping Capacity - Report Writing - Engineering Assignment Help

Assignment Task:

Background  

Figure 1 shows the arrangement of a gear pump. The following design considerations and  modifications are to be implemented.  

1. It has been determined that there is a market for a variety of similar pumps but with reduced  pumping capacity. This can be achieved by fitting ‘thinner’ gears. The same housing can  be utilised but with a reduced depth of the machined cavity to suit the ‘thinner’ gears. The  current design shows 19 mm wide gears but future designs must cater for any gear width  from 15 mm to 19 mm.  

2. The single groove pulley shown is to be replaced by a double-groove pulley. More  information on this pulley and how it is to be attached to the pump shaft is given in item 6  below and later in this document.  

3. The ¼” pipe thread is to be replaced by a M12 x 1.5 thread.  

4. The gears are to be metric with the following specifications:  

• number of teeth 13  

• pitch diameter 32.5 mm  

• outside diameter 37.5 mm  

• pressure angle 20O 

• module 2.5 mm  

5. It has also been decided to supply an assembled kit equipped with two gear pumps,  connected in series, driven by an electric motor. The pumps and the motor are to be  mounted on a specially designed and fabricated steel base. The general arrangement is  depicted in Figure 3.  

6. Drive from the motor to one of the pumps is by V-belts running between two double-groove  pulleys. Each pulley is keyed to its respective shaft using 4mm keys. (Do not use the taper  pin shown in Figure 1.)  

7. The electric motor, refer to Figure 5 for the basic dimensions, runs at a constant 1440 rpm  but the gear pumps need to operate at 900 rpm ± 20 rpm. 

8. Two different length drive belts could be used depending on supply availability 450 mm  and 500 mm pitch lengths. Both belts are classified as type ‘Y’ section.  

9. The second pump is driven by the first through a flexible drive coupling – see Figure 4.  

The Project  

Your task is to:  

1. Create parametric feature-based solid models for all the components of the gear pump as  shown in Figure 1 - but with a suitable double-groove pulley instead of the single-groove  pulley represented.  

2. Create an assembled model of a single pump showing all parts in their working positions  and with the 19 mm wide gears fitted.  

3. Set up a parametric relationship to automatically update the housing cavity depth and other  parts, features and dimensions affected by the gear width change as mentioned in item 1 of  the Background section (i.e. a simple dimension edit to the width of the driving gear model  should automatically change the sizes and / or shape of the effected mating parts and  features.)  

4. Produce a model of a double-groove pulley for the electric motor.  

5. Design and model a base to support the motor and two pumps. The base should be designed  to allow positional adjustability of the motor so that the belts can be tensioned as well as  accommodating the different length V-belts - as mentioned in the Background section, item  8.  

6. Create a second assembled model. This time the model should show the spatial arrangement  of the motor, pumps and base. You will need to include the pulleys, coupling and all other  associated drive components e.g. keys, belts, couplings. You should also show all the  fasteners – bolts, nuts, washers, screws etc.  

7. Produce two separate engineering assembly drawings - one of the overall assembly as in 6  above and the second of a single pump as in 1 and 2 above. In addition to the orthographic  views the drawing should also include a perspective view, title block, parts lists, and other  information generally associated with assembly drawings.  

8. Produce fully dimensioned engineering detail drawings for the parts listed below:  

• housing  

• housing cover  

• gear  

• gear stud  

• shaft  

• mounting base  

• drive and driven pulleys  

Specify appropriate surface finish requirements, general tolerances, and other information normally shown on a detail drawing. In addition to the orthographic views, each drawing should also include a perspective view of the part. 

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