Drivetrain - Revision history

SpookySimon: /* CV Joints */ unsw flex plates

2023-02-23T18:49:39Z

CV Joints: unsw flex plates

Satiric: Add to drivetrain category, remove from other categories

2023-02-03T04:14:33Z

Add to drivetrain category, remove from other categories

SpookySimon: /* Drivetrain Shield */

2023-01-24T17:10:00Z

Drivetrain Shield

SpookySimon: /* Drivetrain Shield */ correcting implication of guard witdh

2023-01-24T17:03:33Z

Drivetrain Shield: correcting implication of guard witdh

SpookySimon: /* CV Joints */ cv joint efficiency

2023-01-24T15:51:28Z

CV Joints: cv joint efficiency

SpookySimon: /* Direct Drive */ hub motors

2023-01-24T15:20:23Z

Direct Drive: hub motors

SpookySimon: /* Driveshaft */ year correction for guelph atv diff

2023-01-23T18:18:36Z

Driveshaft: year correction for guelph atv diff

SpookySimon: /* Drive Mechanisms */ putting driveshaft in direct drive section, idk why it was in indirect drive but idc

2023-01-23T18:16:10Z

Drive Mechanisms: putting driveshaft in direct drive section, idk why it was in indirect drive but idc

SpookySimon: /* Driveshaft */ example of driveshaft drive mechanism

2023-01-23T18:14:40Z

Driveshaft: example of driveshaft drive mechanism

SpookySimon: /* Belt Drive */ a word

2023-01-23T18:08:48Z

Belt Drive: a word

@@ Line 126: / Line 126: @@
 Schultze, Andreas , and Lienkamp, Markus. "Potential of an Improved Energy Efficiency in the Chassis." Automotive and Engine Technology, vol. 1, 2016, pp. 1-4, https://doi.org/10.1007/s41104-016-0009-x.</ref>.
-Alternative designs can and have been used before in FSAE. USC used rubber "guibos" from a BMW driveshaft in 2004<ref>http://www.fsae.com/forums/showthread.php?3250-Rubber-flex-disc-CV-s&s=b23f048c738e7f05fc3a00fc0fb7ef56</ref>. BYU in 2008 used aluminum flex plates (as well as CF driveshafts)<ref>https://web.archive.org/web/20220521091904/http://jengineer.org/formula-sae/</ref>.
+Alternative designs can and have been used before in FSAE. USC used rubber "guibos" from a BMW driveshaft in 2004<ref>http://www.fsae.com/forums/showthread.php?3250-Rubber-flex-disc-CV-s&s=b23f048c738e7f05fc3a00fc0fb7ef56</ref>. BYU in 2008 used aluminum flex plates (as well as CF driveshafts)<ref>https://web.archive.org/web/20220521091904/http://jengineer.org/formula-sae/</ref>. UNSW used aramid flex plates in 2012<ref>https://hyllest.wordpress.com/2012/12/12/fsae-competition-2012/</ref>
 =Validation=

← Older revision		Revision as of 04:14, 3 February 2023
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	<references />		<references />

−	[[Category:~~Internal Combustion]][[Category:Electric Vehicle~~]]	+	[[Category:Drivetrain]]

← Older revision		Revision as of 17:10, 24 January 2023
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	A drivetrain shield is easy to check before tech inspection and usually too time consuming to complete during.		A drivetrain shield is easy to check before tech inspection and usually too time consuming to complete during.
		+
		+	===Finger Guard (CVT)===
		+	Rule T.5.2.10 requires finger guards to enclose any part of the drivetrain that spins when the vehicle is stationary and the engine running. This primarily refers to the CVT mechanism: belt and both pulleys must be enclosed.

	=Final Drive Ratio=		=Final Drive Ratio=

@@ Line 63: / Line 63: @@
 ==Drivetrain Shield==
-Drivetrain shields are covered under the FSAE rule T.5.2. Chain drive shields are subject to stricter rules, requiring a wider shield made of steel. A belt drive system is allowed an aluminum shield of a narrower width. Frame tubes are allowed to act as part of the shield given they pass the material requirements. OEM chain guards on the engine itself such as on the CBR600RR are accepted as part of the chain guard as well. If any part of a brake line or cable carrying traction voltage passes across the chain, it also needs to be shielded by the chain guard or equivalent; this is an especially common issue in tech if the line crosses underneath the chain. This infraction is checked at tech by line of sight.
+Drivetrain shields are covered under the FSAE rule T.5.2. Chain drive shields are subject to stricter rules, requiring a wider shield made of steel. A belt drive system is allowed an aluminum shield of a narrower proportional width, because belts are wider than chains, this may not yield a narrower shield. Frame tubes are allowed to act as part of the shield given they pass the material requirements. OEM chain guards on the engine itself such as on the CBR600RR are accepted as part of the chain guard as well. If any part of a brake line or cable carrying traction voltage passes across the chain, it also needs to be shielded by the chain guard or equivalent; this is an especially common issue in tech if the line crosses underneath the chain. This infraction is checked at tech by line of sight.
 A drivetrain shield is easy to check before tech inspection and usually too time consuming to complete during.

@@ Line 120: / Line 120: @@
 ==CV Joints==
-The most common CV joint in FSAE/FS is the tripod design. Tripods are so ubiquitous they are considered as fundamental part of the drivetrain design in the 2022 FSAE design scoresheet. They can be found commercially off the shelf at most suppliers that sell steel drive-shafts such as RCV and Taylor.
+The most common CV joint in FSAE/FS is the tripod design. Tripods are so ubiquitous they are considered as fundamental part of the drivetrain design in the 2022 FSAE design scoresheet. They can be found commercially off the shelf at most suppliers that sell steel drive-shafts such as RCV and Taylor. Tripod efficiency is well at low joint angles regardless of joint angle up to and beyond 10 degrees<ref>
 Alternative designs can and have been used before in FSAE. USC used rubber "guibos" from a BMW driveshaft in 2004<ref>http://www.fsae.com/forums/showthread.php?3250-Rubber-flex-disc-CV-s&s=b23f048c738e7f05fc3a00fc0fb7ef56</ref>. BYU in 2008 used aluminum flex plates (as well as CF driveshafts)<ref>https://web.archive.org/web/20220521091904/http://jengineer.org/formula-sae/</ref>.
 =Validation=

@@ Line 56: / Line 56: @@
 ===Driveshaft===
 Not common on motorcycles, driveshafts are generally used for front engine, rear wheel drive cars. While some motorcycles do have them, mostly BMWs, they are more expensive and cannot as easily be customized to a new length. These are also the least efficient drive mechanism and can reach efficiencies as low as 80%<ref name = "tvs"/>. Becuase of their cost, lack of tunability, and low efficiency, these are not common in FSAE<ref> Guelph used an ATV differential in 2002, but with the engine in line with the drive shaft making it a direct drive engine.</ref>.
 ==Drivetrain Shield==

@@ Line 43: / Line 43: @@
 ===Pushbelt (CVT)===
 Some CVTs use a special type of belt to connect the drive and driven axes. This belt works by <em>pushing</em> instead of pulling. The belt is made of a series of stacked plates. These are unlikely to find relevant usage in FSAE as they are designed for much higher loads and lifetimes, and are much more expensive than rubber v-belts.
 ===Gear Drive===
@@ Line 56: / Line 53: @@
 An example of a combustion direct drive would be University of Virginia connecting the engine directly to a 2004 Miata differential in 2021<ref>https://www.virginiamotorsportseducation.org/2021-fsae-car.html</ref>.
 ==Drivetrain Shield==

@@ Line 45: / Line 45: @@
 ===Driveshaft===
-Not common on motorcycles, driveshafts are generally used for front engine, rear wheel drive cars. Some motorcycles do have them, mostly BMWs. They are more expensive and cannot as easily be customized to a new length. These are also the lease efficient and can reach efficiencies as low as 80%<ref name = "tvs"/>.
+Not common on motorcycles, driveshafts are generally used for front engine, rear wheel drive cars. While some motorcycles do have them, mostly BMWs, they are more expensive and cannot as easily be customized to a new length. These are also the lease efficient and can reach efficiencies as low as 80%<ref name = "tvs"/>. Becuase of their cost, lack of tunability, and low efficiency, these are not common in FSAE<ref> Guelph used an ATV differential in 2003, but with the engine in line with the drive shaft making it a direct drive engine.</ref>.
 ===Gear Drive===
 A gear drive system transmits torque through a gear train to the driven axle, this can reach very high efficiency but is requires a custom design and implementation and is often heavier than an equivalent chain drive would be.

@@ Line 32: / Line 32: @@
 ===Belt Drive===
-Power can also be transmitted with a belt and two pulleys. A belt and pulley does not require lubrication, but still needs a [[tensioner|tensioner]] to achieve the necessary pre-tension. Belt drive systems are more expensive than sprockets<ref name = "tvs">https://www.tvsmotor.com/Media/Blog/chain-vs-belt-vs-shaft-drive-motorcycle-final-drive-systems-explained-with-their-characteristics/</ref><ref>https://www.motorcyclistonline.com/all-about-motorcycle-chains-belts-and-drive-shafts/</ref><ref>https://www.cardosystems.com/blog/the-great-debate-belt-vs-chain-drive-motorcycle/</ref>. These systems are frequently lighter and quieter than chain drive systems. The chordal action is much less apparent on belt drives because the pulley is more circular than a sprocket.
+Power can also be transmitted with a belt and two pulleys. A belt and pulley system does not require lubrication, but still needs a [[tensioner|tensioner]] to achieve the necessary pre-tension. Belt drive systems are more expensive than sprockets<ref name = "tvs">https://www.tvsmotor.com/Media/Blog/chain-vs-belt-vs-shaft-drive-motorcycle-final-drive-systems-explained-with-their-characteristics/</ref><ref>https://www.motorcyclistonline.com/all-about-motorcycle-chains-belts-and-drive-shafts/</ref><ref>https://www.cardosystems.com/blog/the-great-debate-belt-vs-chain-drive-motorcycle/</ref>. These systems are frequently lighter and quieter than chain drive systems. The chordal action is much less apparent on belt drives because the pulley is more circular than a sprocket.
 <!-- belt systems may allow slip... please discuss-->