scholarly journals Development of a New Type Cutter "Revolving Type Pinion Cutter" for the Hobbing of the Face Gear

1977 ◽  
Vol 43 (373) ◽  
pp. 3526-3534
Author(s):  
Kin'ichi SHlNJO ◽  
Masafumi SAKAMOTO ◽  
Md.Rezaur RAHMAN
Keyword(s):  
The Face ◽  
2011 ◽  
Vol 143-144 ◽  
pp. 458-462
Author(s):  
Yang Liu ◽  
Zhi Long Xing ◽  
Dong Chen

Based on the characteristics of low efficiency and short life cycle of the previous face gear in the clutch, the article puts forward a new type of the face gear. The new face gear can joggle interlaced gear, transfer large torque and extend service life. The article describes the history and recent research of the gear fear, compares the structural characteristics of the previous face gear and the new face gear and analyzes the theory of the strength calculation for the transmission intensity of the new face gear. What's more, simulations based on finite element analysis draw the face gear transmission strength and provide a reliable basis for the strength design of the new face gear.


Author(s):  
Andrzej Gessner ◽  
Roman Staniek

Plane spiroid gears currently applied in feed motion rotary drives are roughly described in this paper. The theoretical possible methods of backlash adjustment in this kind of gear are mentioned. Referring to industry experience the only applied method, which uses the eccentric, is described. Its advantages as well as disadvantages related to operation and wearing process are pointed. The disadvantages are mainly connected with changing the gear axis distance while rotating eccentric in order to adjust backlash. A graph depicting the movements of the worm in the direction of backlash reducing and in the perpendicular one, which changes the axis distance, is given. In order to provide some information about the influence of changing axis distance on the mating of face toothing with the worm, mathematical model was created. Some effects of numerical calculations based on that model and showing the bearing contact of the face gear drive supplied with eccentric backlash adjustment are depicted. It can be noticed, how changing the axis distance influences the bearing contact. It can be also estimate if within the chosen range of eccentric rotation the theoretical bearing contact is still acceptable to operate correct. A simplified model presenting the wearing process is also provided. It reveals that after some operating time an edge contact appears while reducing backlash. It significantly decreases the operating time till the next adjustment. There are two methods of backlash reducing described: the first is typical whilst the second is improved and proposed by the author. The advantage of the proposed method is lengthening the operating time between two backlash adjustments. In the end a new type of spiroid gear mating with double-lead worm and deprived of aforesaid disadvantages is mentioned.


1978 ◽  
Vol 21 (155) ◽  
pp. 899-906
Author(s):  
Kin'ichi SHINJO ◽  
Masafumi SAKAMOTO ◽  
Md. Rezaur RAHMAN
Keyword(s):  
The Face ◽  

2020 ◽  
Author(s):  
Peter Schulz ◽  
Elin Andersson ◽  
Nicole Bizzotto ◽  
Margareta Norberg

BACKGROUND The foray of Covid-19 around the globe is sure to have instigated worries in many humans, and lockdown measures may well have created their own worries. Sweden, in contrast to most other countries, had first relied on voluntary measures, but had to change its policy in the face of an increasing number of infections. OBJECTIVE The aim was to better understand the worried reactions to the virus and the lockdown measures. To grasp the reactions, their development over time was studied. METHODS Results were based on an unbalanced panel sample of 261 Swedish participants filling in 3218 interview questionnaires by smartphone in a 7-week period in 2020. Causal factors considered in this study include the perceived severity of an infection, the susceptibility of a person to the threat posed by the virus, the perceived efficacy of safeguarding measures and the assessment of government action against the spread of Covid-19. The effect of these factors on worries was traced in two analytical steps: the effects at the beginning of the study, and the effect on the trend during the study. RESULTS Findings confirmed that the hypothesized causal factors (severity of infection, susceptibility to the threat of the virus, efficacy of safeguarding and the assessment of government preventive action did indeed affect worries. CONCLUSIONS The results confirmed earlier research in a very special case and demonstrated the usefulness of a different study design, which takes a longitudinal perspective, and a new type of data analysis borrowed from multi-level study design.


2014 ◽  
Vol 7 (2) ◽  
pp. 283-298 ◽  
Author(s):  
Abdul Ghani Imad

The problematic addressed in this article is the challenge initiated by the Arab revolutions to reform the Arab political system in such a way as to facilitate the incorporation of ‘democracy’ at the core of its structure. Given the profound repercussions, this issue has become the most serious matter facing the forces of change in the Arab world today; meanwhile, it forms the most prominent challenge and the most difficult test confronting Islamists. The Islamist phenomenon is not an alien implant that descended upon us from another planet beyond the social context or manifestations of history. Thus it cannot but be an expression of political, cultural, and social needs and crises. Over the years this phenomenon has presented, through its discourse, an ideological logic that falls within the context of ‘advocacy’; however, today Islamists find themselves in office, and in a new context that requires them to produce a new type of discourse that pertains to the context of a ‘state’. Political participation ‘tames’ ideology and pushes political actors to rationalize their discourse in the face of daily political realities and the necessity of achievement. The logic of advocacy differs from that of the state: in the case of advocacy, ideology represents an enriching asset, whereas in the case of the state, it constitutes a heavy burden. This is one reason why so much discourse exists within religious jurisprudence related to interest or necessity or balancing outcomes. This article forms an epilogue to the series of articles on religion and the state published in previous issues of this journal. It adopts the methodologies of ‘discourse analysis’ and ‘case studies’ in an attempt to examine the arguments presented by Islamists under pressure from the opposition. It analyses the experiences, and the constraints, that inhibit the production of a ‘model’, and monitors the development of the discourse, its structure, and transformations between advocacy, revolution and the state.


2021 ◽  
pp. 21-34
Author(s):  
PU JINGXIN

Abstract: The danger of the novel coronavirus has not yet come to an end, and new variants have begun to attack the world. What philosophy should humankind’s strategy be based on when human society as a group is fighting against Covid-19, as the pandemic ravages the world? Unfortunately, political leaders of various countries have failed to achieve the overall awareness of attacking the pandemic for a shared future for mankind so far. In the face of the pandemic, mankind as a whole urgently needs to break through the narrow nation-oriented ideology of seeking only self-protection. The International Community should establish a new type of international cooperation featuring the concept of harmony of "all things under heaven as a unity". The international relations system dominated by the power ofwestern discourse is now in a bottleneck. The main aim of this article is to study the ancient Chinese wisdom of "the Unity of Man and Heaven" philosophy and build a global harmonious community. The author argues that the “export” of the aforementioned wisdom must be a priority for Chinese scholars. Keywords: Tao; Unity of Man and Heaven; Novel Coronavirus; Anthropocentrism; Harmony.


2013 ◽  
Vol 819 ◽  
pp. 100-104
Author(s):  
Xue Yu Peng ◽  
Qing Li ◽  
Tai Yong Wang

The face gear tooth surface theoretical equation, based on the mesh of curved tooth face gear and involute worm, was deduced by means of differential geometry, meshing theory and so on. According to the conditions of the gear meshing, studying the ideal contract-point trace line theoretical equation under the conditions of no machining errors, installation errors and so on. By solving the equations and simulating in SOLIDWORKS, finally the tooth contact situation of face gear and cylindrical worm in the meshing process was got.


Author(s):  
Xian-Long Peng

The conventional tooth surface of a face gear is difficult to manufacture, and the cutter for the face gear cutting is not uniform even though the parameters of the pinion mating with the face gear slightly change. Based on the analysis of the geometry features of the tooth surface, a new developable ruled surface is defined as the tooth flank of the face gear, for which the most important geometry feature is that the flank could be represented by a family of straight lines, hence it could be generated by a straight-edged cutter. The mathematical models of the new ruled tooth surface, the cutter and the generation method are presented, the deviation between the ruled surface and the conventional surface, the correction of the ruled surface to reduce the deviation are investigated through numerical examples. The manufacturing process is simulated by VERICUT software, and the results demonstrate that even when the principle deviation is added to the machined deviation, the absolute deviation is on the micro-scale. The meshing and contact simulation shows that the new surface could obtain good meshing performance when the number of face gear teeth is greater than three times the number of pinion teeth. This research provides a new method for manufacturing face gears.


Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3439 ◽  
Author(s):  
Haiyan Zhang ◽  
Minfang Peng ◽  
Josep M. Guerrero ◽  
Xingle Gao ◽  
Yanchen Liu

The strong coupling between the power grid and communication systems may contribute to failure propagation, which may easily lead to cascading failures or blackouts. In this paper, in order to quantitatively analyse the impact of interdependency on power system vulnerability, we put forward a “degree–electrical degree” independent model of cyber-physical power systems (CPPS), a new type of assortative link, through identifying the important nodes in a power grid based on the proposed index–electrical degree, and coupling them with the nodes in a communication system with a high degree, based on one-to-one correspondence. Using the double-star communication system and the IEEE 118-bus power grid to form an artificial interdependent network, we evaluated and compare the holistic vulnerability of CPPS under random attack and malicious attack, separately based on three kinds of interdependent models: “degree–betweenness”, “degree–electrical degree” and “random link”. The simulation results demonstrated that different link patterns, coupling degrees and attack types all can influence the vulnerability of CPPS. The CPPS with a “degree–electrical degree” interdependent model proposed in this paper presented a higher robustness in the face of random attack, and moreover performed better than the degree–betweenness interdependent model in the face of malicious attack.


2001 ◽  
Vol 205 ◽  
pp. 268-269 ◽  
Author(s):  
S. Fabrika ◽  
A. Mescheryakov

The object SS433 is a well-known source of relativistic jets, which are formed in supercritical accretion disk. It is very probable that the disk has polar channels and their radiation is collimated (the photo-cones). A face-on SS433 object can appear as ultra-bright and highly variable X-ray source, Lx ˜ 1040 − 1042 erg/s. We discuss the properties of these hypothetical objects and their frequency expected in galaxies. We describe a search for such objects using the ROSAT All Sky Survey and RC3 catalog of galaxies. Among the total 418 positive correlations we find that 142 sources in S and Irr galaxies are unknown as AGNs. Nuclear sources among them still contain many AGNs. Non-nuclear (offset) sources are rather hard, their X-ray luminosities are 1039 − 1041 erg/s. Their observed frequency is about 4–5% per galaxy, that is in agreement with expected frequency of the face-on SS 433 stars. The only way to recognize such stars is their expected violent variability in X rays.


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