The analysis of the current situation is caused by a lot of problems caused by the quality of the gear. The most important thing is that it does not meet its proper motion accuracy, contact accuracy and the resulting noise. For example, the gear precision of the machine tool directly affects the machining accuracy; if the gap of the drive system of the stacker is too large, it will cause unnecessary dynamic load, affecting the accuracy of its positioning, and it will affect the normal outbound and warehousing work. In the case of automobile engines only, in medium and heavy-duty vehicles such as the CA141 and EQ140, the timing gear pair plays a key role in the valve train. The excessive noise of the gear pair is also a common type of failure. The oil pump of the lubrication system is a gear pump consisting of a pair of involute spur gears. If the contact accuracy of the gears is not enough, it will affect the oil pressure of the lubrication system. If the oil pressure is too low, the lubrication will be poor, which may cause the burning of the tiles. The accident of pulling the shaft. In the differential device of the rear car, it is a conical and umbrella-shaped gear. If the matching clearance is improper, abnormal noise will occur and the gear wear will be accelerated. In the years of dealing with cars, the author has successfully analyzed and solved such failures, and studied the reasons, mainly the quality of the gears. First of all, some gears produced by informal manufacturers have many problems in materials and processing techniques, resulting in large tooth shape errors, poor tooth surface quality, soft teeth, etc. Noise is inevitable after meshing. Secondly, due to the tooth profile error, installation error and machine tool transmission error of the machining tool, the tooth profile error will be caused, and the improper matching will affect the stability of the transmission [3, 8].
Solution Firstly, from the working mechanism of the gear, a pair of meshing gears must achieve stable operation and accurate motion, and must meet the three conditions of conjugate: (1) A pair of conjugate points on the meshing surfaces of the two gears must coincide at the contact position. (2) The two gears mesh with the conjugate tooth surface, and must be tangent at the contact point, and the two conjugate curved surfaces must be staggered to avoid curvature interference; (3) the two-phase conjugate flank surface is in conjugate contact The relative velocity of movement at the point must be within the public section [4]. Reference [1] pointed out that the change of the single tooth motion error curve of each tooth is continuous, but the motion curve changes from one tooth to another, and the error curve is discontinuous in most cases. The characteristic is reflected as the single tooth motion error curve of the adjacent two teeth is overlapped, as shown. The overlapping point represents the alternate point of the tooth surface, and the overlapping condition reflects the state in which the tooth surfaces are alternately engaged. At the same time, it can be seen that the single tooth motion error curve of the adjacent two teeth has tangent lines with different slopes at the same overlapping point, which indicates that the alternate point of the tooth surface will produce a sudden “shock†of the velocity, which also generates noise. Therefore, to reduce the noise, the angle between the two tangent lines should be reduced [1].
The relationship between error and speed and acceleration error is compared with the second. The overall error theory points out that it is not enough to control the transmission quality of the gear to control the error maximum of some error items. It is also necessary to control the variation trend (error shape) of the error, and Often the error shape is more important than the error maximum [1]. It can be clearly seen on the overall error curve that the tooth change of the middle drum shape is alternated once per tooth, and the tooth surfaces are alternately arranged. The tooth surface of the concave tooth shape alternates three times on each tooth surface, one tooth surface. Alternately plus two impacts with very bad top edge engagement alternate. Therefore, even if the maximum error value of the middle drum shape is larger than the maximum error value of the concave shape, the transmission noise is still significantly lower than that of the concave shape. Therefore, the noise of the gear will increase significantly after excessive wear, and sometimes some abnormal sounds will occur when some old and new gears are used together. After measuring and modifying the new teeth, the noise reduction effect is very significant. Regarding gear shaping, it is to reduce the impact of a pair of teeth entering and disengaging due to manufacturing errors, gear deformation, etc., and the tooth surface and the tooth profile are usually subjected to conscious micro-shearing [9]. Gear spur gear co-axial drive chassis innovation preset analysis analysis including tooth profile modification and tooth profile modification. Tooth profile modification includes trimming, rooting and rooting as shown. The profile modification has obvious effects on reducing dynamic load, reducing noise, improving load carrying capacity and improving transmission efficiency. Tooth modification can be divided into tooth end thinning, drum shaping and helix angle trimming as shown. The end of the tooth is only trimmed at both ends of the tooth, and the middle is not trimmed. According to the actual situation, it can be straight line thinning and curve thinning, and the tooth end thinning can reduce the load concentration in the tooth direction, thereby reducing The uneven distribution of load distribution can also form artificial oil culverts, which is beneficial to noise reduction. Drum shaping is almost continuous cutting of the full tooth length, which has obvious effects on improving the tooth strength and reducing the meshing noise. The amount of tooth shape modification is related to the angle of "impact error", the amount of load change and the amount of wear [1, 5].
The shape of the profile of the tooth profile is related to the shape of the gear. The shape of the gear and the influence of the selected pairing noise are also great. Explain the influence of the tooth shape and alternating form of the involute gear on the gear noise. The noise intensity is graded according to 5, 4, 3, 2, and 1. The noise of the 5th grade is the strongest. It can be seen that the gear noise is closely related to the tooth shape and gear quality. In the repair of the automobile engine timing gear, various errors such as the common normal line and the tooth surface are comprehensively considered, and various parameters of the new and old gears are matched, and the gears are selected by the gear single-bit gear or the gear overall error measuring instrument. The transmission error and transmission noise are measured to select the best pair, so that the selected gear is more effective in improving the engine noise, and this method is also very effective in the repair of the gearbox [1, 5].
Fourth, with the development of science and technology today, the materials industry provides a broader space for mechanical transmission. The timing pulley replaces the gear transmission to a certain extent and to some extent. Synchronous pulleys are commonly used in car engine timing systems. This transmission mode has the advantages of accurate transmission, high effect, stable transmission, vibration absorption, low noise, no lubrication, and convenient maintenance, so it can be used in a wide range [6].
Conclusion The use of gears is different and the requirements are different. The tolerance of the gears is determined according to the requirements of the gears. The overall error theory provides a strong theoretical basis for gear error analysis, gear error repair, and noise reduction. The new development of modern industry has brought new challenges to the work of gears. The need for small size, light weight, high transmission torque, high tooth surface hardness and high precision gears has become an inevitable trend.
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