【正文】 activated by a manual closed design features Interlocking shoes balancing devices(patented technology)constantly equalizes the clearance of brake shoes on both sides and made adjustment unnecessary, thus avoiding one side of the brake lining sticking to the brake brake is equipped with a shoed autoaligning hinge points are equipped with selflubricating bearing, making high efficiency of transmission, long service is unnecessary during bracket ensure the brake works brake spring is arranged inside a square tube and a surveyor’s rod is placed on one is easy to read braking torque value and avoid measuring and lining is of card wholepiece shaping structure, easy to linings of various materials such as halfmetal(nonasbestos)hard and halfhard, soft(including asbestos)substance are available for customers to adopt the pany’s new types of thruster as corollary equipment which work accurately and have long Power Transmission The Two Types Of Power TransmissionIn hydraulic power transmission the apparatus(pump)used for conversion of the mechanical(or electrical,thermal)energy to hydraulic energy is arranged on the input of the kinematic chain ,and the apparatus(motor)used for conversion of the hydraulic energy to mechanical energy is arranged on the output()The theoretical design of the energy converters depends on the ponent of the bernouilli equation to be used for hydraulic power systerms where, mainly, hydrostatic pressure is utilized, displacement(hydrostatic)pumps and motors are used, while in those where the hydrodynamic pressure is utilized is utilized gor power transmission hydrodynamic energy converters( pumps)are specific characteristic of the energy converters is the weight required for transmission of unit can be demonstrated that the use of hydrostatic energy converters for the low and medium powers, and of hydrodynamic energy converters of high power are more favorite().This is the main reason why hydrostatic energy converters are used in industrial of the energy in hydraulic motor(electric, diesel engine)。③Quality assurance after control after manufacture includes warranties and product service extended to the users of the and receiving inspection before manufacturingQuality assurance often begins ling before any actual manufacturing takes may be done through source inspections conducted at the plants thatsupply materials, discrete parts, or subassemblies to manufacturer’s source inspector travels to the supplier factory and inspects raw material or premanufactured parts and inspections present an opportunity for the manufacturer to sort out and reject raw materials or parts before they are shipped to the manufacturer’s production responsibility of the source inspector is to check materials and parts against design specifications and to reject the item if specifications are not inspections may include many of the same inspections that will be used during in these are: ①Visual inspection。⑤ Vibration。⑤ Applied at low or elevated a critical part of a machine fails, the whole machine must be shut down until a repair is , when designing a new machine, it is extremely important that critical parts be made strong enough to prevent designer should determine as precisely as possible the nature, magnitude, direction and point of application of all design is mot, however, an exact science and it is, therefore, rarely possible to determine exactly all the applied addition, different samples of a specified material will exhibit somewhat different abilities to resist loads, temperatures and other environment spite of this, design calculations based on appropriate assumptions are invaluable in the proper design of , it is absolutely essential that a design engineer knows how and why parts fail so that reliable machines which require minimum maintenance can be , a failure can be serious, such as when a tire blows out on an automobile traveling at high the other hand, a failure may be no more than a example is the loosening of the radiator hose in the automobile cooling consequence of this latter failure is usually the loss of some radiator coolant, a condition which is readily detected and type of load a part absorbs is just as significant as the speaking, dynamic loads with direction reversals cause greater difficulties than static loads and, therefore, fatigue strength must be concern is whether the material is ductile or example, brittle materials are considered to be unacceptable where fatigue is general, the design engineer must consider all possible modes of failure, which include the following: ① Stress。① Gradually applied。⑥ Safety。② Strength analysis。機械維修和裝配技能訓練課銼配基本功操作能達到中級工操作水平，能正確使用和維護常用測量儀器和量具，熟練掌握麻花鉆的刃磨及普通修磨，能對常見機械設備和機床出現(xiàn)的常見故障進行分析并排除，能正確安裝普通機床并對其進行精度檢測。能結合專門工藝學，進行零件的工藝分