机械设计名词解释（终极版）

1. What’s the procedure（过程） of design of sliding bearings? （1）Select the construction and the materials of bearings

(2) Preliminarily select the basic dimensions of bearings (3) Check the design conditions; (4) Select the lubricant and the lubricating installation. 2. What’s the procedure of design of shaft?

(1) T--- dmin; (2) structure design; (3) force analysis; (4) strength check 3. What is the rated life of a rolling bearings？

The life that 90% of the bearings would achieve successfully under a rated load. 4. What are fundamental requirements for machinery design?

(1) Functional requirements; (2) Economic requirements; (3) Safety and environment requirements; (4) Reliability requirements; (5) Other specific requirements. 5. What are failure models of mechanical components?

(1) Fracture failure; (2)Failure resulted from unexpected deformations; (3) Failure on surface damage (4)Failure resulted from abnormal operational conditions.

6. What is the basic rated dynamic load of rolling bearings?

The load to which the bearings can be subjected while achieving a rated life (l10) of 1 million revolutions(rev).

7. What’s the design procedure of key joints?

(1)Get the section size b*h;(2)Select proper key length L;(3)Check the strength calculation.

8. What is the creep of belt drives?

Because the belt is elastic materials there is the elastic stretch when the belt is loaded. Then relative slip takes place between the belt and the pulley. Such relative slip is known as belt creep. 9. What are gear failures?

(1) Breakage; (2) Pitting; (3) Gluing; (4) Abrasive wear; (5) Ridging. 10. What are the design criteria of gear? Contact strength and bending strength

11. What are the characteristics of worm gearing?

Advantages:A large speed ratio;Silent and smooth operation;Small drive sizeBetter load distribution; Self-locking action.

Disadvantages: Low efficiency;Expensive antifriction materials;Considerable sliding speed; Considerable heat generated.

12. What are the primary considerations in the mounting of a bearing? 1 The shaft seat diameter and tolerances; 2 The housing internal bore and tolerances;

3 The shaft shoulder diameter againt which the inner race of the bearing will be located; 4 The housing shoulder diameter provided for locating the outer race; 5 Radius of the fillets at the base of the shaft and housing shoulders; 6 The means of retaining the bearing in position. 13. What are the functions of lubrication in a bearing unit? (1) to provide a low-frication film;

(2) to protect the bearing components from corrosion; (3) to help dissipate heat from the bearing unit; (4) to carry heat away from the bearing unit;

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(5) to help dispel contaminants and moisture from the bearing.

14. What are design requirements for mechanical components?

(1) Design for Safety ;(2) Design for manufacturability;(3)Design for costs; (4)Design for reliability.

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