齿轮基础知识（Basic knowledge of gear）.docVIP

齿轮基础知识（Basic knowledge of gear） Gear Foundation 1) what is modulus? It said the size of the gear modulus. The modulus is a reference pitch with the PI (PI) ratio in millimeters (mm). In addition to modulus, the size of the teeth is also represented by CP (pitch: Circular) and DP (diametral pitch: Diametral, pitch). Pitch is the distance between the two adjacent teeth. 2) what is the diameter of a circle? It is standard diameter pitch diameter of gear. The two major factors determining the size of the gear are the modulus and the number of teeth, the diameter of the pitch circle equal to the product of the number of teeth and the modulus (end face). In the past, the diameter of the reference circle was called the reference diameter. Recently, according to the ISO standard, the scale is called the circle diameter. 3) what is the pressure angle? An acute angle. The tooth profile and the radial line dividing circle intersection and the tooth shape of the tangent clip is called reference circle pressure angle. Generally referred to as the pressure angle, refers to the pressure angle of the circle. The most commonly used pressure angle is 20 degrees, but there are also gears with 14.5, 15, 17.5 and 22.5 degrees of pressure. 4) what is the difference between a single head and a double headed worm? The spiral tooth number. The worm was referred to as head, equivalent to the number of gear teeth. The greater the number of head, the greater the lead angle. 5) how do we distinguish R (dextral) from L (left)? This gear shaft is vertical to the ground flat, inclined tooth on the right is on the left, right inclined gear is left gear. 6) what is the difference between M (modulus) and CP (week pitch)? CP (Week Festival: Circular pitch) is the dividing circle on the circumference of the tooth pitch. The unit is the same as the modulus. CP divided by pi (PI) M (modulus). The M (modulus) relationship with the CP is shown below. M (d) = CP / PI (PI) are both indicative of tooth size u