Papers by Keyword: Spiral Bevel Gear

Abstract: The research investigates the application of static structural finite element analyses in studying spiral bevel teeth gear of Polski fiat with four tooth angles at 25, 30, 35, 40 degrees. The researchers simulated 16 times using Ansys, investigating all the load cases. These included elements such as deformations, normal stress, equivalent stress at the tooth contacts. Findings provide guidance on gear updating and improvement in gearbox gearing response, which enhance subsequent generation mechanical systems.

Abstract: When machining the cycloidal bevel gear on the CNC machine tool, the cutting force is gradually increased with the increase of the cutting depth when the feed speed of the cutter head is constant. The fluctuation of the cutting force is easy to cause the spindle vibration, reduce the surface quality. The off-line control is mainly used to optimize the NC code, and the cutting feed in the NC code is segmented according to the corresponding optimization algorithm and the constraint condition. When the spindle speed is 90 rpm, constant feed 40 mm/min, the cutting force of the volatility of 127.45%. When the feed rate is reduced from 50 mm/min to 26mm/min, the fluctuation rate of the cutting force is 46%. The variable feed control can effectively reduce the amplitude fluctuation of the cutting force.

Abstract: Currently the fatigue testing of bevel gears are being done by using non rotating type of fixtures that applies fatigue load on a single tooth, which does not resemble the actual loading condition in an automotive differential gear box. This paper discusses the experimental setup with the noise and vibration analysis approach to determine the signature of failures of spiral bevel gears. The proposed experimental setup seems promising for further research and development in the fatigue testing of spiral bevel gears. The Crown pinion and wheel assembly is used for the testing. The pinion is connected to the electric 3 phase AC motor of 75HP with a suitable coupling and the crown wheel is mounted on the half axle shaft, which in turn is connected to an electric dynamometer. The speed/torque of electric motor and the load applied by the dynamometer can be varied. The acoustic sensor is mounted near the differential gear box and the accelerometers are mounted on the Pinion bearing, Crown wheel bearing and the half axle bearing. A four channel data acquisition system is used to log data in time domain (raw data) by three accelerometers and an acoustic sensor. The variations of sound pressure(dB) v/s time, sound Pressure(FFT-(RMS)) amplitude v/s Frequency, Acceleration v/s Time, Octave analysis i.e., Band power v/s Frequency, Noise spectrum Power v/s Frequency, Histogram, Power density v/s Time can be obtained. These data are then used to plot vibration and SPP levels in frequency domain to develop the noise and vibration signature of that crown pinion for given cycles of operation. The tests on Bevel pinion and gear set were performed in the BEC, Bagalkot NVH lab facility. The gear set run successfully at double the rated torque for 30 million pinion cycles. And the signature of pinion failure was obtained. The results demonstrated the suitability of using the given bevel crown pinion and gears set for specified speed, high load application in differential gear box of an automobile.

Abstract: To increase the utility rate of machine, the sculptured surface machining method was researched to use in the spiral bevel gear tooth surface manufacturing with the industrial CNC milling machine. The three dimentional tooth surface points are required to design tool path planning in the SSM method. For obtaining the arbitrary point of tooth surface, the uniform bicubic B-spline tooth surface was reconstructed by cutting simulation and fitting programs. The discrepancies between fitted and theoretical points of tooth surface were provided with CAD/CAM platform. According to the results, the tool path planning of sculptured tooth surface machining can be designed and realized further.

Abstract: This paper analyzed the adjustment principle and calculation method of parameters for CNC spiral bevel gear milling machine, and establish the models of NC machining of spiral bevel gear milling machine. Through the calculation of examples, we acquire the machine tool axes of the instantaneous position when CNC spiral bevel gear milling machine process. The paper establish simulation machine model of spiral bevel gear milling machine and the simulation processing. The simulation results meet the spiral bevel gear milling machine functional verification requirements.

Abstract: This paper takes spiral bevel gear installation planes of a main reducer in a rear axle of a certain car as the research object, using ug to establish three-dimensional model of the main reducer assembly, applies adams simulation and the quantitative and qualitative method to analyze the effect law of the spiral bevel gear installation flatness error on gear mesh vibration, obtains the reasonable area of gear installation flatness error , it provides the reference for parameter design and installation of the spiral bevel gear in the main reducer.

Abstract: Starting from the fact of backlash and gear transmission error, it is established vibration model of spiral bevel gear lapping system with two degrees of freedom. Through normalized calculate, it is obtained dynamic response of lapping vibration model under different braking torque. According to the time course and the phase diagram, during the process that brake torque switch from small to big, teeth meshing, collision and disengaged alternately goes on, and with the braking torque increases to a certain value, the teeth collision disappear and then back into the complete meshing state.

Abstract: Based on spiral bevel gear NC manufacture principle and generating motion of the generating gear and the work gear, the NC generation of spiral bevel gear cutting is realized by means of the vector transformation. As sophisticated calculation of the transformation is hard to implement in each interpolation cycle of NC machining, the coordinated motion of NC coordinate axes is expressed as quintic parametric spline functions, which use the rotation angle of the work gear as the parameter. The constrained optimization method of three design variables is established to obtain contacting points of gear tooth surfaces, which are acquired by solving nonlinear equations sets traditionally. The condition of normal coincidence is simplified and the object function of the equal position vectors of mating gears is established. The contacting points of gear tooth surfaces can be used for tooth contact analysis. The parametric curve interpolator is combined with spiral bevel gear NC machining, and is applied to the self-developed spiral bevel gear NC milling machine to control the gear cutting. Experimental results show that the proposed method is feasible and effective in the control of NC machining for the spiral bevel gear.

Abstract: Neglecting the influence of static transmission error, a non-linear dynamic model of spiral bevel gear pair with time-varying backlash was presented. Through the simplification of above model, the dimensionless form of gear system was obtained. Then, the dynamic characteristics of gear system were acquired by using Runge-Kutta method under the influence of time-varying backlash and torque. The results showed primary harmonic amplitude of gear backlash and torque had a significant effect on the non-linear and vibration characteristics of gear system. With the change of that, bifurcation phenomenon, quasi periodic motion and chaotic motion were detected. In addition, the variation and fluctuation of amplitude, containing displacement amplitude and velocity amplitude, were analyzed detailedly.

Abstract: Based on the survey of existing brush cutter and the analysis of the known conditions, this paper mainly studied design mechanism and principle of brush cutter, and carried on calculation and calibration of spiral bevel gear cutting machine parts, so as to ensure that the design of brush cutter is safe, efficient, simple, comfortable and environmentally friendly. Product after research is of reliable performance, convenient operation, low noise and zero smoke and higher safety factor, making it get more extensive application in the industry.