The Manual Transmission System

The Manual Transmission System In this report, I am going to compare and contrast the difference between Toyota 5 speed manual gearbox transmission and Toyota 5 speed automatic transmission system. 2. History of the transmission In 1894 Louis-Rene Panhard and Emile Levassor invented the modern transmission. Today we still use the same concept since it was introduced. The concept is still the same that the crankshaft connects from the engine to the transmission shaft through clutch. The latter is mounted to gears which control and operate the transmission of the motion that is coming from the engine to the wheels. Few experiments have been done about type and numbers of gears but still until today the same concept is applied. To make it easier for the driver to control speed and with help of gears, synchromesh gears and a live rear axle were invented. Instead of having gears engage and disengage again from each other, a car transmission that had gears and continuous with each other was introduced, all the gears were moving and the dog clutch was designed in order to connect the gears that are caused to rotate by engine and move the wheels forward. Different gears with different sizes are designed to increase or decrease the momentum of the vehicle. The most popular transmissions were 4 speed transmissions which its top gear (4th) had a ratio of 1:1 while other gears had lower ratios. Then, engineers came with a 5th gear in which will increase the ratio by 1 between the engine rpm and the wheel rpm that is known as overdrive. American inventors Harold Sinclair and Richard Spikes designed automatic transmission while German inventors invented the automatic transmission rudimentary design. While General Motors provided automatic transmission in all of their cars that were manufactured from 1938 and by the end of 1940s most of the car manufactures offered at least one transmission in their models. Electric cars also fitted with electric car transmission. Now the market for automatic transmission is huge and most cars are manufactured with it (Car transmission, 2006) 3. Automatic transmission system This is the type of transmission that is capable of changing the gear ratios automatically while the vehicle is moving without the need of the driver to manually change the gear using the gear stick. The main purpose of the transmission is to provide the following outcome: Neutral to keep the engine running without the gear, or moving the vehicle. Lower gears for taking off purpose and for operating in heavier situation. Higher gears for cruising, higher speed and lighter weight Reverse gear to move the vehicle backwards. Transferring the driving torque to the required wheels (Crolla, D, 2009, p, 109) The automatic transmission comes into two different types. The front wheel drives vehicles that are designed more compact than rear wheel drive vehicles transmissions that are normally connected in the engine compartment in which they are known as transaxle. Both of these types of transmission do the same job and same design of the planetary gear train. The essential part for the front wheel drive transmission is differential, while the rear wheel drive transmission has externally mounted differential which is uses the drive shaft to link up with the transmission. The automatic transmission system contains few major components. These are: Planetary gear unit Torque converter Hydraulic control unit Seals and gasket Computer Governor/ modulator The above six components perform various duties in transmission as explained below (Toyota technical training). Planetary gear unit: The purpose of planetary gear unit is to provide and changing different gear ratios. Generally, the planetary gear unit contains three major parts. These are ring gear, inner gear (sun gear) and planetary carrier that carries three or four gears which are between the inner gear and outer ring gear. Planetary gear unit When one part of the planetary gear connects to the input shaft which leads to the engine, the second part is held still and the third part usually attached to the output shaft. It all depends on which part stays still, which one is the input or output because it will result in different gear ratios. Things such as brake bands, hydraulic clutch packs and one way clutches are used in the planetary gear to control the power flow. Every gear links up to a combination of clutch packs and bake bands being engaged or disengaged (Samarins.com) Torque converter Is a fluid type coupling, that lets the engine to rotate freely without the help from the transmission, if the engine is running slowly, idling or on the stop traffic, there is a small amount of torque that is passed via torque converter, less pressure is also required on the brake pedal to keep the car stationary. Also when you put more pressure on the gas pedal, it speeds up and adds more fluid into the torque converter which causes the wheels to receive more torque. The torque converter housing contains five major components. Pump is fixed to housing, turbine that is connected through output shaft to transmission, stator has output that is connected to fixed shaft in transmission, fluid and converter clutch. This housing is attached to the engines flywheel and rotates and at any speed that the engine is spinning. The torque converter also has pumps that is made up of fins and are attached to the housing that uses the same speed as engine to turn. Centrifugal type pump is used inside the torque converter, as it rotates it causes the fluid to be thrown outside and this action creates the vacuum that draws a lot of fluid in at the centre. Once the fluid arrives in the blades of the turbine, the transmission begins to rotate and this causes the car to move, the turbines blades are curved and this makes the fluid that is coming from the outside to go into different way before it goes to the centre of the turbine, this changing of direction is the one that causes the turbine to spin. In other way we can put that both turbine and the fluid spin in different direction and this creates the force as an outcome. This fluid that exists from the turbine is usually moving into different direction as the pump and engine turn, because if the fluid hits the pump directly, it may cause the engine to waste power or slow it down and that is why there is a stator in the torque converter (Builders transmission and used car Inc.). Hydraulic control unit: A transmission fluid is sent using the engine oil pump that controls the performance of the car clutches that helps the planetary gear sets to work smoothly. Seals and gasket Their work is to support and maintain the right place of the engine oil and stop it from leaking outside. Governor / Modulator This controls and monitors throttle position and the speed of the car to determine when to change the gears. Computer This is the major unit that uses sensors to control all the activities such as engine speed, engine load, throttle position, brake pedal position etc. (Carazoo, 2010) 4. Materials The materials that are used to build clutch or transmission have to resist heat, friction, durable, strong, hard and tough. These materials are organic, Kevlar, segmented Kevlar, hybrid carbon, ceramic and sintered iron (UUC Motorwerks, 2003) 5. Advantages of automatic transmission system The torque converter gives more engine torques and reduces the strain and the shock of the entire drive line. A lock up clutch is included in the latest automatic transmission, this helps in maximizing the fuel economy because of its direct mechanical linkage from the engine to the transmission. A vehicle with automatic transmission is very comfortable and easy to drive as the driver does not need to manually change the gear ratios. Automatic transmission can also be powerful and strong because of the arrangement of the sun gear and ring gear, this increase the gears contacts that reduces the gears breakage and supplies more torque on big area (Rowe, R. 2010) 6. Disadvantages of automatic transmission Since the automatic transmission is made up of several components, the main setback can occur when single part breaks down working and this can cause a transmission to stop working, as a result maintaining or fixing it can be very expensive. Also the total speed of the vehicle is controlled by the computer that manages the transmission, and the driver can lose the acceleration beyond a certain speed. Automatic transmission can overheat easily. 7. Manual transmission system This is the type of transmission in which the driver has to manually change the gear ratio setting by using the gear stick inside the car. There are two types of manual transmissions. The constant mesh design and the sliding gear type. The sliding-gear type, no part is turning inside the transmission case except the main drive gear and cluster gear when the transmission is in neutral. In order to mesh the gears and apply engine power to move the vehicle, the driver pushes the clutch pedal and moves the shift knob, which shifts a linkage and forks to slide a gear along the main shaft that is connected straight above the cluster. Once the gears are meshed, the clutch pedal is released and the power from the engine is sent to the drive wheels. There can be different gears on the main shaft of different diameters and tooth counts, and the transmission shift linkage is designed so the driver has to unmesh one gear before being able to mesh another. With these older transmissions, gear clash is a problem because the gears are all rotating at different speed (Cook, M. 2009) The 5 speed manual transmission gear box has a three plane arrangement order with reverse gear alongside fifth gear and uses a special fluid to operate. Moving forks are attached to three wide base rails that work in arranged bushing for less friction, these moving levers are connected together to the shifting cables. Every one of them uses different way with selected lever and this creates less shifting efforts for a driver, it also avoids to accidentally engaging the reverse gear from fifth because of the way it is designed to operate, it shifts the crossover lever into three to four gear without jamming or binding. The shift knob is usually used to control the gear ratios. The forward gear ratios are synchronized using great capacity dual cone brass (1st and 2nd) and other gears are synchronized with paper friction materials which is more strong and clash resistant than brass. The input shaft uses paper materials synchronizers, by cutting rotating inertia it helps to reduce the shifting effort. A reverse engagement clash can be minimised by using a brake mechanism. The needle roller bearings are fixed to reduce friction and extend gear life. The case itself is cast in only two pieces to reduce leak paths; structural ribs strengthen and harden the case to reduce noise and vibration with small or no extra weight. The case has good bending stiffness, offering a natural frequency above the exciting frequency of the engine at peak rpm (Massey, K. 2010) 8. Clutch system A manual transmission system will not function without a clutch. This is the mechanism that is used for transmitting rotation that can be engaged and disengaged. This is controlled by the driver who uses a special release mechanism to control the movement of the torque between them. The clutch assembly A single disc clutch assembly contains four major parts: the rear face of the flywheel- a driving member the clutch disc- the driven member the pressure plate assembly-a driving member the release mechanism-disengages and engages the clutch (May, E. 2004. p,250) 8.1 Types of clutches Multidisc clutch that contain two or more disc are usually used in automatic transmission, motor cycles and heavy mechanical equipment. While the manual transmission is operated using a dry clutch and there is no lubrication between surfaces. The automatic transmission clutch operates wet, it is enclosed in the transmission case that is full of lubrication fluid. Generally, in automatic transmission there is no clutch pedal and a gear shift (Roymech, 2010) (Genta Morello, 2009 p, 425) There are so many different types of clutches such as cone clutches, wet clutches and dry clutches but the common one uses one or more friction discs that are pushed very tight together or against the fly wheel using a spring. A Clutch contains two rotating shafts, one is operated using pulley and the other one uses a different method, these two shafts are connected together by the clutch so that they can be locked together and rotating at the same time while it engages, or be decoupled and rotate at different speed while it disengages. The input shaft is used at the centre of the pressure to engage the splines of the friction disc hub. The clutch and flywheel assembly spinning as one unit when the engine is rotating. The flywheel is receiving the torque from the engine, uses the friction that is occurring from the clutch discs to the spline hub into the transmission. When the clutch pedal is moved, it manages and controls the movement of the torque between two units. The pressure pl ate can be retracted against the springs force and frees the disc from its clamping action by depressing the pedal. These two units and clamping force can be connected again by releasing the pedal once again. This is a very important mechanism when: Engaging the transmission into gear, the input shaft from the transmission must be disengaged from the engine. The pedal is released slowly, it provides a gradual engagement of the drive, as the facings slips of the friction slip, and this lets the torque to be applied continuously until these two units are connected very tightly. Choosing different ratio, changing gears when the vehicle is moving, for this to happen, the engine torque from the transmission must be interrupted. The disengaged of the transmission that causes the vehicle to stop and let the engine run at idling speed. The co-efficient of friction between the friction facings and their mating surfaces, the total spring force and the amount of facings in contact can decide the torque that is transferred by the clutch. If you want to increase the torque capacity, the diameter of the clutch needs to be increased and this will cause the spring force to increase. Multi plate clutch can be made by having two or more clutch plates as well as increasing the number of facings and torque capacity. They are useful where by reducing the diameter is beneficial or where by increasing the spring strength is undesirable. (CDX online eTextbook). 9. Advantages of manual transmission system The manual transmission vehicles are usually cheaper and good in maintenance compare to the automatic ones, this is because changing of the fluid can be very less, also when it breaks down it is more than likely that the clutch needs to be replaced and this can save you a lot from buying a new or second hand transmission. It gives better control because of the faster shift response, this is mainly due to the bad weather. They can as well be good in braking because the driver is not fighting the effort of the automatic transmission to move forward. It can be good is terms of fuel economy because you can shift the gear into neutral and avoiding driving in lower gears. A skilled driver at shifting gears will have a better traction in snowy, muddy or slippery conditions and might as well be easier to get of the dangerous situation than automatic one. Manual transmission is also lighter in weight. And there is a fun point of view in driving manual because it keeps you active and keeps you aware of what is going on around you (Moore, S. 2010) 10. Disadvantages of manual transmission system Driving manual car in traffic can be very pain full especially when there is a stop start driving, automatic cars are more comfortable in this case. It is very unlikely to find a manual transmission car with a cruise control. Most car now are built in automatic transmission so there is less availability of cars with manual transmission as well as the difficulties in learning how to drive manual transmission cars. 11. Report Summary This has been a successful report and I have researched a lot of information about this topic. Indeed I have acquired a lot transmission system. Here are some few pointed aligned below: History of the transmission What is automatic transmission system Major components of the automatic transmission and how they work Advantages and disadvantages of automatic transmission system What is manual transmission system Clutch assembly and clutch components and how they work Advantages and disadvantages of manual transmission system 12. Conclusions According to my understanding in the report, it shows the main difference between automatic transmission and manual transmission is that automatic transmission uses torque converter to create power while manual transmission uses clutch to engage and disengage the gears. Also automatic cars are in very high demanding since most of the components are controlled by computers now in the car. It also shows that once the automatic transmission breaks it can be very hard and complicated to fix it and this may end up in replacing the whole transmission. In terms of manual gear box, the report shows they are very hard to break or die as well as less maintenance too, this is one of the best things in manual transmission because it can last for long time without anything happen. From my point of view I would always recommend to go for manual car if you enjoy the gear changing ration as I do.

Fishing Industry

The world’s fisheries are a huge resource that our society has overused and therefore, has caused a decline in fish stocks, which has lead to a world fishery crisis. Fish have been a vital resource for many years and are essential to the lifestyles of many people. It is also a huge economic industry for many countries. Over the past decade, fish stocks have been exploited and we have witnessed a huge decline; fish farms were created as an alternative. The fishing industry is a multibillion-dollar industry and has now created empty nets due to years of overfishing, exploitation, and inhumane fishing techniques. Overfishing is a non-sustainable use of the oceans caused by a degradation of the system due to catching too many fish for the system to support. When too many fish are caught, they cannot sustain their population, which leads to there being no more fish to be caught. Overfishing is caused because of fishing fleets worldwide that are three times larger than needed to sustain our population. â€Å"Over 25% of all the world's fish stocks are either overexploited or depleted. Another 52% is fully exploited; these are in imminent danger of overexploitation (maximum sustainable production level) and collapse. Thus a total of almost 80% of the world's fisheries are fully exploited, depleted, or in a state of collapse. Worldwide about 90% of the stocks of large predatory fish stocks are already gone. † (overfishing. org). An example of overfishing is the collapse of the cod fishing industry in Newfoundland in 1992, which collapsed due to the mismanagement of overfishing and fisheries. This lead to the loss of over 40,000 jobs and had a devastating effect on the economy. The cod fishing industry in Newfoundland is still recovering today and will probably never be the same as it once used to be. The reality of modern fishing is that the industry is dominated by fishing vessels that far out-match nature's ability to replenish fish. Giant ships using state-of-the-art fish-finding sonar can pinpoint schools of fish quickly and accurately. The ships are fitted out like giant floating factories – containing fish processing and packing plants, huge freezing systems, and powerful engine s to drag enormous fishing gear through the ocean. Put simply: the fish don't stand a chance. † (greenpeace. org). Overfishing must be stopped because if it is not, the fish stocks around the world will collapse and the fish that we are used to eating such as Tuna, Cod, Halibut, Swordfish, and Salmon will no longer be available to us and alternatives will have to be sought after. Bottom trawling is a common practice used by most fishing vessels and it is very destructive to the ocean and all of its inhabitants. Bottom trawling is when huge nets are dragged along the ocean floor. These nets have large metal plates to keep the bottom down and have wheels attached to them, crushing almost anything that crosses their path. Bottom trawlers have no care for the environment and destroy deep-sea life forms that take years to recover. Since these nets are dragged along the sea floor, it is hard to manage what is caught. Many unwanted mammals are caught in these nets, which are referred to as bycatch. â€Å"It has been estimated that a staggering 100 million sharks and rays are caught and discarded each year. Tuna fisheries, which in the past had high dolphin bycatch levels, are still responsible for the death of many sharks. An estimated 300,000 cetaceans (whales, dolphins and porpoises) also die as bycatch each year, because they are unable to escape when caught in nets. † (greenpeace. org). â€Å"Shrimp trawlers capture the most bycatch, between 2 and 10 pounds of sea life for every one pound of shrimp. All seven species of marine turtle are endangered because each year about 12,000 die as bycatch. † (Desonie 135) Overfishing is terrible for our oceans and for us as humans. Much of the fish caught goes to waste and wasting a valuable resource is extremely dangerous. If overfishing doesn’t stop, fish stocks will become depleted and at the rate we exploit the fish stocks, there is not much time. Marine protected areas or marine reserves have been implemented in some areas to stop fishing when a species becomes endangered. â€Å"Large-scale marine reserves are areas that are closed to all extractive uses, such as fishing and mining, as well as disposal activities. Within these areas there may be core zones where no human activities are allowed, for instance areas that act as scientific reference areas or areas where there are particularly sensitive habitats or species. † (greenpeace. org). These marine reserves are not put in place just to stop overfishing, they are also put in place to protect certain species from water pollution. Marine reserves are very effective and highly significant because they allow the endangered species to start recovery and to try to get back to the stage it was once at. Industrial fishing is not allowed in a marine protected area, and in some, no recreation at all is allowed. The crisis of empty nets that the world; a fishing industry is facing is the fishing industries own doing. Years of uncontrolled and unmonitored fishing have lead to the depletion of many fish stocks around the world. The fishing industry is vital to many people around the world and is a way of life for many and it would be detrimental to the global economy if fish stocks around the world were to collapse. This will happen soon if we don’t stop. Governments need to put more set of laws on fishing to try and stop the overfishing. However, it is hard to stop because most of it occurs in international waters. This is where the United Nations needs to step in and help out. Fishing is great for the economy but the way that the fishing industry operates will only destroy it and turn it into something negative in the end.

Children and Criminal Intent

Case Study #1 James M. Bufford Liberty University Online 11/18/12 This week’s case study was very interesting from a developmental standpoint. It seems to be a rather blanket statement of our legal system to say that children under 7 are not held responsible for crimes and that a 6 year-old cannot form criminal intent. My personal opinion is that children differ in their maturity levels (some may act older, others younger, developmentally). However, with that opinion, I can see the argument of: Who determines that maturity level? What is that determination based upon?What research has been done to prove this? Therefore, we must refer to what has been proven through the many years of research of biosocial development. According to our text, the prefrontal cortex (sometimes called the frontal cortex or frontal lobe) is said to be the executive of the brain because all the other areas of the cortex are ruled by the planning, prioritizing and reflection in the prefrontal cortex. S till, this area must be developed-or mature-over the years; this development occurs through genetics and early experience (Berger, 2011, pg. 15). In this case, it seems the early experience of growing up around those that were most likely careless and irresponsible with guns, had a major impact on the boys life. Maybe he was taught to shoot in the backyard? All of this could be considered what Vygotsky considered to be â€Å"Social Learning†-which could also lead to the child being curious about guns and observant about how they are to be used, as well as being â€Å"mentored† by his loved ones who were also in prison on gun-related charges (Berger, 2011, pg. 240). Maybe he feared his classmate?This may have led to him taking the gun to school, being afraid of confrontation. The interaction of the amygdala and the hippocampus can cause fear to be either constructive (causing a child to use good judgement); or, in this case, destructive, allowing fear and misplaced ange r to take over their emotions and act out on what he’s seen other family members do (shooting a gun) (Berger, 2011, pg. 217). Perseveration, the tendency to persevere in, or stick to, one thought or action for a long time (Berger, 2011, pg. 216), may have also played a role in the child carrying out this action of shooting his classmate.The fact that he was able to remember overnight to take the gun to school and use it the next day. Acknowledging, once again, the childs’ upbringing, maybe he was encouraged to be like his other family members? This could be a natter of gaining extrinsic motivation, which is a drive, or reason to pursue a goal, that arises from the need to have one’s achievements rewarded outside, perhaps by receiving material possessions or another person’s esteem (Berger, 2011, pg. 267). This, as well, is crucial to consider when looking at all the factors that went into the child committing this crime.Who knows how long this lifestyle w as embedded into his young, impressionable mind! There were so many variables that contributed to this unfortunate situation. The fact that he ran into the corner after pulling the trigger shows that maybe when he got in trouble at home, he was sent to the corner as a way of punishment. His actions after the crime showed he carried on as a child, not realizing the significance and danger of what just occurred due to his impulsiveness in the moment of anger. REFERENCES Berger, 2011. The Developing Person Through The Life Span. New York, NY. Worth Publishers

A Research On Parenting Aspects Of Military Connected...

Methodology We used the Preferred Reporting Items for Systematic Reviews and Meta-analyses Approach (PRISMA) for generating and systematically reviewing and analyzing original published studies on military families, their children’s behaviors, and parenting interventions. Key definitions and MeSH terms used were military personnel, parent, parenting, child-rearing, veteran, and parent-child intervention. Inclusion criteria for this review consisted the study needed to be original research addressing parenting aspects of military connected families and their children with preschool children as the part or central focus of the sample, or testing an intervention study that addressed these concepts. Exclusion criteria consisted of omitting studies of military connected families without preschool children, and non-English-language and non US military samples. After determining the inclusion and exclusion criteria, the terms were entered into PubMed, CINAHL, Scopus, PsychInfo, Web of Science, and EMbase for the years 2001-2014, yielding over 11,800 records. Further search within the reference lists and bibliographies of the analyzed studies and previous review articles on similar subjects revealed two additional studies that were included in the final review. This resulted in 21 published studies meeting criteria. Please see figure 1 for details of research synthesis method. Discussion Deployment effects and children health outcomes. The current literature reveals both parentShow MoreRelatedThe Effects of Socio-Economic Status on Students Achievements in Biology13494 Words   |  54 Pagesand secondary level which caused differential academic performance of students. In the quest of finding survival feet, the nation has evolved series of socio-economic and educational measures but these have not improved the socio-economic status of families in the country. It’s within this situation that this study examine the correlates of socio-economic status and students achievement in biology in few selected public and private schools in Ifako-ijaye Local government area of Lagos A person’s educationRead MoreStephen P. Robbins Timothy A. Judge (2011) Organizational Behaviour 15th Edition New Jersey: Prentice Hall393164 Words   |  1573 PagesFoundations of Organization Structure 479 v vi BRIEF CONTENTS 4 The Organization System 16 Organizational Culture 511 17 Human Resource Policies and Practices 543 18 Organizational Change and Stress Management 577 Appendix A Research in Organizational Behavior Comprehensive Cases Indexes Glindex 637 663 616 623 Contents Preface xxii 1 1 Introduction What Is Organizational Behavior? 3 The Importance of Interpersonal Skills 4 What Managers Do 5 ManagementRead MoreMedicare Policy Analysis447966 Words   |  1792 PagesIncome Medicare Beneficiaries Subtitle B—Reducing Health Disparities Subtitle C—Miscellaneous Improvements TITLE III—PROMOTING PRIMARY CARE, MENTAL HEALTH SERVICES, AND COORDINATED CARE TITLE IV—QUALITY Subtitle A—Comparative Effectiveness Research Subtitle B—Nursing Home Transparency Subtitle C—Quality Measurements Subtitle D—Physician Payments Sunshine Provision Subtitle E—Public Reporting on Health Care-Associated Infections TITLE V—MEDICARE GRADUATE MEDICAL EDUCATION TITLE VI—PROGRAM