Problem $4$

Transmission Shaft

We provide the $($partial$)$ assembly drawing of a transmission mechanism. $($See below$)$ primarily

composed of:

$-$ the pulley $(13).$

$-\backslash (\backslash$quad $\backslash )$ the shaft$-$mounted pinion $(2).$

$-\backslash (\backslash$quad $\backslash )$ the housing $\backslash ((1$ ; $6)\backslash ).$

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Function and designation:

$\backslash$begin$\{$tabular$\}\{|$c$|$c$|$l$||\}$

$\backslash$hline Part Number & Part Name & $\backslash$multicolumn$\{1\}\{$c$|\}\{$ Functionality $\}\backslash \backslash$

$\backslash$hline $\backslash$hline $1$ & Housing & Provides structural support and protects internal components. $\backslash \backslash$

$\backslash$hline $\backslash$hline $2$ & Shaft$-$Mounted Pinion & Transfers rotational motion to the gears, key part of the mechanism. $\backslash \backslash$

$\backslash$hline $\backslash$hline $4$ & Bearing & Allows for smooth rotational motion of the shaft without friction. $\backslash \backslash$

$\backslash$hline $\backslash$hline $12$ & Sleeve & Ensures proper alignment and spacing, helps secure shaft components. $\backslash \backslash$

$\backslash$hline $\backslash$hline $10$ & Lip Seal & Prevents leakage of lubricants and protects against contamination. $\backslash \backslash$

$\backslash$hline $\backslash$hline

$\backslash$end$\{$tabular$\}$

Detail drawinos $\backslash (\backslash$cdot $\backslash )$

$1)$ Explain the presence of Condition B $($see assembly drawing$).$

Hint: Condition B involves preventing direct contact between the housing $(1)$ and the other components. Think about which components need a clearance or precise fit to avoid wear or misalignment. Focus on how the housing interacts with the bearing and what it is protecting.

$2)$ Explain the presence of Condition C $($see assembly drawing$)$:

Hint: Condition C involves the clamping force or tightening mechanism that holds certain parts together.

Consider what parts might need to be securely fastened to avoid movement during operation. Focus on the pinion $(2)$ and how the sleeve $(12)$ must remain stable in operation. Think about what elements need to be held firmly in place to avoid shifting or loosening.

$3)$ Referring to the partial assembly drawing of the transmission shaft, complete the table below.

Hint: When determining assembly tolerances, think about whether the part requires:

$-$ A tight fit to ensure no movement between parts, like bearings and shafts$).$

$-$ A neutral fit $($to allow easy assembly while still supporting functionality, like sleeves and seals$).$

$-$ A loose fit $($for parts that need flexibility or adjustments, like seals$).$

Use engineering handbooks or lecture slide tables to find the appropriate tolerance positions $($like $\backslash ($ H$,$ k$,$ g $\backslash ))$ and grades $($e$.$g$.,7,6)$ for each part. Consider how the type of fit $($tight$,$ neutral, loose$)$ affects the tolerance you choose.

You can follow this link to access a useful engineering handbook: