Method for measuring rod spacing of internal helical gear
A technology of internal helical gears and measurement methods, which is applied in the direction of measuring devices, instruments, etc., can solve problems such as large principle errors, and achieve the effect of eliminating principle errors
Active Publication Date: 2017-12-29
CHONGQING QINGPING MACHINERY
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And the axes of the measuring sticks on the opposite left and right sides are spatially out-of-plane straight lines, and the simple calculation formula using the distance between the balls is likely to have a large principle error
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[0036] figure 1 When the internal helical gear of the present invention is an even number of teeth, a schematic diagram of the spatial state of the first measuring rod and the second measuring rod, figure 2 When the internal helical gear of the present invention has an odd number of teeth, a schematic diagram of the spatial state of the first measuring rod and the second measuring rod, as shown in the figure: the method for measuring the distance between the internal helical gear rods of the present embodiment includes the following steps:
[0037] A. Set the first measuring rod L1 and the second measuring rod L2 inscribed with the corresponding tooth groove in the tooth grooves on the opposite sides of the inner helical gear one by one, and ensure that the first measuring rod L1 and the second measuring rod L2 There are two circular sections tangent to the tooth surface of the corresponding tooth groove, and the center of the circular section is located on the helix D that r...
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The invention discloses a method for measuring the rod spacing of an internal helical gear. The method comprises steps of: determining two circular cross sections, tangent to the tooth surface of a corresponding tooth slot, on the inscribed section, inscribed with the tooth slot, of each measuring rod; considering the two circular cross sections of each measuring rod as two measuring balls (or two circles without thicknesses) having the same diameter and tangent to left and right tooth surfaces in the same tooth groove, namely enabling the center distance of the two circular cross sections to be equal to the contact length of the measuring rod and the tooth surface, determining the axes of the two measuring rods as spatial non-coplanar straight lines by the circular cross sections of the two measuring rods, obtaining the distance between the axes of the two measuring rods by a method calculating the minimum distance between two spatial non-coplanar straight lines so as to obtain the rod spacing. The method can well eliminate a principle error caused by a calculation formula with the same rod spacing and ball spacing in the prior art.
Description
technical field [0001] The invention relates to the field of internal helical gear design, in particular to a method for measuring the distance between internal helical gear rods. Background technique [0002] Internal gears are widely used in gear planetary mechanisms. In the design and manufacture of gears, the bar spacing is often used to represent the tooth thickness of the gear. However, measuring the tooth thickness of internal helical gears with the bar spacing often encounters calculation and measurement problems, because In the "Gear Handbook" and the corresponding design software, the same formula as the ball spacing is used, but because the tooth surface of the helical gear is an involute helical surface, the steel ball can be tangent to the left and right tooth surfaces in the tooth groove, and the measuring rod Only the circle where the two end faces are located is tangent to the tooth surface, and any other section is not tangent to the tooth surface, and is in...
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Login to View More IPC IPC(8): G01B21/16
CPCG01B21/16
Inventor 谢建华刘成平
Owner CHONGQING QINGPING MACHINERY