Skip to main content

Constant Mesh Gear Box

Constant Mesh

Constant Mesh Gear Box



In this type of gearbox, all the gears are in constant mesh with the corresponding gears on the layshaft. The gears on the most shaft that is splined, are free (fig). The dog clutches are provided which are free to slide on the main shaft. The gears on the layshaft. are, however, fixed.
When the left dog clutch is slide to the left by means that of the selector mechanism, its teeth area unit engaged with those on the clutch gear and that we get the direct gear. The same dog clutch, however, once slide to right makes contact with the gear and gear is obtained. Similarly movement of the right dog clutch to the left results in low gear and towards the right in reverse gear.

Double declutching


the constant mesh box, for the smooth engagement of the dog, clutches it's necessary that the speed of the main shaft gear and therefore the sliding dog should be equal. Therefore to get lower gear, the speed of the clutch shaft, layshaft, and main shaft gear must be increased. This is done by double-declutching. The procedure for double-declutching is as given below: The clutch is disengaged and therefore the gear is dropped at neutral. Then the clutch is engaged and the accelerator pedal pressed to extend the speed of the most shaft gears, After this, the clutch is once more disengaged and therefore the gear moved to the specified lower gear, and therefore the clutch is once more engaged. As the clutch is disengaged doubly during this method, it is called double-declutching. For changing to a higher gear, however, the reverse effect is desired i.e., the driver has to wait with the gear in neutral till the main shaft speed is decreased sufficiently for a smooth engagement of the gear.

Constant Mesh Gear Box Advantages


Compared to the sliding mesh type, the constant-mesh gearbox has the following advantages :
  1. As the gears got to stay always in mesh. It is now not necessary to use straight spur gears.' instead, voluted gears area unit used that is quieter running.

  2. Wear of dog teeth on account of engaging and disengaging is reduced because here all the teeth of the dog clutches are involved compared to only two or three teeth in the case of sliding gears.

Popular posts from this blog

RS Aggarwal Aptitude Book PDF Free Download

RS Aggarwal Aptitude Book PDF Free Download RS Agarwal Aptitude Book PDF Free Download: Quantitative Aptitude by R.S Aggarwal is a standout amongst the most inclining books among the hopefuls getting ready for Bank PO, PO, MBA, RBI, IBPS, CAT, SSC, IAS, PSC, Hotel Management, Railway Recruitment Exams, and other aggressive and placement tests. This book is suggested by different specialists in this field. This book covers relatively every theme which is being requested for the focused exams. On the off chance that you are looking to Download RS Aggarwal Quantitative Aptitude PDF's most recent version with the expectation of complimentary then you appear to be at the correct place.    Download PDF  RS Agarwal Aptitude Book PDF Free Download This book covers Problems on Surds and Indices, Simplification, Numbers and Ages, Pipes and Cisterns, Boats and Streams, Problems on Trains, Simple and Compound Interests, Time and Work, Permutations and Combination, Clocks, Odd Man Out, Heights
Read more

Limitations of Terzaghi Theory

Limitations of Terzaghi Theory The value of the coefficient of consolidation has been assumed to be constant.  The distance d of the drainage path cannot be measured accurately in the field. The thickness of the deposit is generally variable, and an average value has to be estimated.  There is sometimes difficulty 1n locating the drainage face, and sometimes thin previous seams that can act as good drainage faces are missed in the boring operations. The equation is based on the assumption that the consolidation is one-dimensional. In the field, the consolidation is generally 3-dimensional. The lateral drainage may have a significant effect on the time rate of consolidation. The initial consolidation and secondary consolidation have been neglected. Sometimes these form an important part of the total consolidation. In actual practice, the pressure distribution may be far from linear or uniform.
Read more

Types Of Current Collector

Current Collector A current collector is a device used to collect electrical current from a moving conductor, such as a train or a trolley. It is typically used in electric vehicles, such as trains and trams, to transfer power from an overhead power source to the vehicle's electric motor. The current collector consists of a sliding contact, which is often made of carbon or copper, that makes contact with an overhead power source, such as an overhead catenary wire or a third rail. The sliding contact is mounted on the vehicle and is typically in the form of a pantograph or a trolley pole. The pantograph is a device with a metal frame and a spring-loaded arm that presses against the overhead power source. It is raised and lowered by the operator of the vehicle, and as it moves along the overhead power source it maintains contact and collects the electrical current. The trolley pole is a vertical pole that is mounted on the roof of the vehicle and has a horizontal arm that extends out
Read more