Group 25 - Transmission - Revision history

UB08G25: /* Part Table */

2008-12-05T10:52:06Z

Part Table

UB08G25: /* Part Table */

2008-12-05T10:51:41Z

Part Table

UB08G25: /* Part Table */

2008-12-05T10:50:41Z

Part Table

UB08G25: /* After Assembly */

2008-12-05T10:49:14Z

After Assembly

UB08G25: /* After Assembly */

2008-12-05T10:48:31Z

After Assembly

UB08G25: /* After Assembly */

2008-12-05T10:48:00Z

After Assembly

UB08G25: /* References */

2008-12-05T10:46:15Z

References

UB08G25: /* After Assembly */

2008-12-05T10:42:00Z

After Assembly

UB08G25: /* How an automatic transmission works */

2008-12-05T10:40:54Z

How an automatic transmission works

UB08G25: /* After Assembly */

2008-12-05T10:40:01Z

After Assembly

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 |Machining
 |-
-|Throttle Cable
+|Control Cable
 |1
 |Plastic, Rubber, Steel
 |Extrusion, Injection Molding
 |-
 |13mm Bolt (1" Long)

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 |Extrusion, Machining, Bending
 |-
-|Gasket
+|Gasket (not shown)
 |1
 |Steel
 |Sheet Metal Forming
 |-
-|Gasket
+|Gasket (not shown)
 |1
 |Plastic
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 |Steel
 |Machining
 |-
 |13mm Bolt 1 1/4”

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 |Steel
 |Sheet Metal Forming
 |-
 |Gasket
@@ Line 704: / Line 703: @@
 |Plastic
 |Sheet Forming
 |-
 |13mm Bolt 1”

← Older revision		Revision as of 10:49, 5 December 2008
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	The following applet shows the engagement and disengagement of clutch packs for different gears.		The following applet shows the engagement and disengagement of clutch packs for different gears.
		+
	<embed src="http://static.howstuffworks.com/flash/automatic-transmission-gears-diagram.swf" type="application/x-shockwave-flash" allowscriptaccess="always" width="640" height="505"></embed>		<embed src="http://static.howstuffworks.com/flash/automatic-transmission-gears-diagram.swf" type="application/x-shockwave-flash" allowscriptaccess="always" width="640" height="505"></embed>

@@ Line 1,024: / Line 1,024: @@
 The following applet shows the engagement and disengagement of clutch packs for different gears.
-<embed src="http://static.howstuffworks.com/flash/automatic-transmission-gears-diagram.swf" type="application/x-shockwave-flash" allowscriptaccess="always"></embed>
+<embed src="http://static.howstuffworks.com/flash/automatic-transmission-gears-diagram.swf" type="application/x-shockwave-flash" allowscriptaccess="always" width="640" height="505"></embed>
 When researching for the oral report, we discovered that the transmission was actually missing a critical component. The torque converter, which acts as the clutch for an automatic transmission was not given to us with the transmission. Without it, the transmission has no way to disengage from the engine when shifting. The torque converter is essentially two propellers facing each other. The propellers are surrounded in a fluid to keep mechanical loss to a minimum. When one propeller spins, it pushes the fluid through the second, providing power to the transmission. When the transmission changes gears, the increased resistance simply slows the second propeller, while allowing the first to continue spinning, eliminating the need for a movable clutch plate.

← Older revision		Revision as of 10:48, 5 December 2008
Line 1,022:		Line 1,022:
	<embed src="http://www.youtube.com/v/LM6eyXSGGaE&hl=en&fs=1&color1=0x2b405b&color2=0x6b8ab6" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="505"></embed>		<embed src="http://www.youtube.com/v/LM6eyXSGGaE&hl=en&fs=1&color1=0x2b405b&color2=0x6b8ab6" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="505"></embed>

		+
		+	The following applet shows the engagement and disengagement of clutch packs for different gears.
		+	<embed src="http://static.howstuffworks.com/flash/automatic-transmission-gears-diagram.swf" type="application/x-shockwave-flash" allowscriptaccess="always"></embed>

	When researching for the oral report, we discovered that the transmission was actually missing a critical component. The torque converter, which acts as the clutch for an automatic transmission was not given to us with the transmission. Without it, the transmission has no way to disengage from the engine when shifting. The torque converter is essentially two propellers facing each other. The propellers are surrounded in a fluid to keep mechanical loss to a minimum. When one propeller spins, it pushes the fluid through the second, providing power to the transmission. When the transmission changes gears, the increased resistance simply slows the second propeller, while allowing the first to continue spinning, eliminating the need for a movable clutch plate.		When researching for the oral report, we discovered that the transmission was actually missing a critical component. The torque converter, which acts as the clutch for an automatic transmission was not given to us with the transmission. Without it, the transmission has no way to disengage from the engine when shifting. The torque converter is essentially two propellers facing each other. The propellers are surrounded in a fluid to keep mechanical loss to a minimum. When one propeller spins, it pushes the fluid through the second, providing power to the transmission. When the transmission changes gears, the increased resistance simply slows the second propeller, while allowing the first to continue spinning, eliminating the need for a movable clutch plate.

@@ Line 1,034: / Line 1,034: @@
 ==References==
-[http://www.apastyle.org/ APA Style]
-You must use this format (It's easier than MLA, so don't worry).
+Karem, Nice. "How Automatic Transmissions Work"
-[http://www.auto.howstuffworks.com/automatic-transmission.htm/ APA Style]
+     http://auto.howstuffworks.com/automatic-transmission1.htm

@@ Line 1,018: / Line 1,018: @@
 [[Image:Trans142.jpg|200px]]
-When transmission fluid pressure is routed to a clutch pack, it compresses the clutch rings, preventing them from sliding past each other. You may notice that the clutch rings alternate, with teeth pointing out or in. When the rings lock, the inner section and the outer section turn together, sending power to a different sun, planetary, or ring gear. In our transmission, there were three orbital gear sets (Sun, Planetary, Ring), although this number varies depending on transmission design. By engaging or disengaging clutch packs, the transmission can control the speed and direction of the ring and planetary gears connected to the output shaft. This is how the automatic transmission "shifts gears". Since an orbital gear set is essentially a mechanical speed comparator, by varying the speed and direction of the planetary gear, the sun gear, or both, the transmission can create different gear "ratios" with fewer moving parts than a manual transmission. The following video shows the operation of an automatic transmission.
+When transmission fluid pressure is routed to a clutch pack, it compresses the clutch rings, preventing them from sliding past each other. You may notice that the clutch rings alternate, with teeth pointing out or in. When the rings lock, the inner section and the outer section turn together, sending power to a different sun, planetary, or ring gear. In our transmission, there were three orbital gear sets (Sun, Planetary, Ring), although this number varies depending on transmission design. By engaging or disengaging clutch packs, the transmission can control the speed and direction of the ring and planetary gears connected to the output shaft. This is how the automatic transmission "shifts gears". Since an orbital gear set is essentially a mechanical speed comparator, by varying the speed and direction of the planetary gear, the sun gear, or both, the transmission can create different gear "ratios" with fewer moving parts than a manual transmission. The following video shows the operation and manufacture of an automatic transmission.
 <embed src="http://www.youtube.com/v/LM6eyXSGGaE&hl=en&fs=1&color1=0x2b405b&color2=0x6b8ab6" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="505"></embed>
@@ Line 1,032: / Line 1,032: @@
 The second recommendation we would make would be to replace the set pin connecting the parking lock actuator components with a set screw, or keyed shaft. During dis-assembly, we spent nearly two hours trying to remove the pin ourselves, before bringing the transmission to the machine shop to have the pin removed for us. During re-assembly we encountered problems as well, since the pin is set facing into the transmission body (when assembled) making it very difficult to remove or re-attach. A set screw or keyed shaft would eliminate this problem with no loss of joint strength.
 The third recommendation we would suggest would be to replace the bolts holding down the speed sensor cover plate with a larger size. During dis-assembly, we nearly stripped the bolt heads trying to get them off. A larger size would eliminate the possibility of stripping with only a marginal increase in weight.
 ==References==

← Older revision		Revision as of 10:40, 5 December 2008
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	The third recommendation we would suggest would be to replace the bolts holding down the speed sensor cover plate with a larger size. During dis-assembly, we nearly stripped the bolt heads trying to get them off. A larger size would eliminate the possibility of stripping with only a marginal increase in weight.		The third recommendation we would suggest would be to replace the bolts holding down the speed sensor cover plate with a larger size. During dis-assembly, we nearly stripped the bolt heads trying to get them off. A larger size would eliminate the possibility of stripping with only a marginal increase in weight.

−	~~== How an automatic transmission works ==~~

−	This product that we were given is one of two types of transmission systems. There is an automatic and manual transmission. The two main differences between an automatic and manual transmission is that the automatic has no clutch pedal and most importantly, no gear shift. With an automatic transmission, once it is placed into drive mode, nothing else has to be done for the car to move. It is the transmission that allows a car to have gears and thus have variate speeds. It is also the one piece in a car that makes more effective use of the engines torque; achieving better efficiency in the long run. Without a transmission in a car assembly, the car engine would not have different speeds. Focusing more on automatic transmissions, different gears are not locked and unlocked; simply the same set of gears are used. The device which makes an automatic transmission possible is the planetary gearset. This small piece creates the different gear ratios. We must understand to an extent the vital role this tiny planetary gearset plays in the transmission. To put it into context, everything in the transmission is there just to aid the planetary gearset. It is one of many of the main components of an automatic transmission system. The modern automatic transmission consists of many components and systems that are designed to work together in a symphony of clever mechanical, hydraulic and electrical technology that has evolved over the years.
−
−	~~'''THE MAIN COMPONENTS INCLUDE'''~~
−
−	~~-'''The planetary gearset''': These parts are the mechanical systems that provide the various forward gear ratios as well as reverse.~~
−
−	-'''A hydrolic system''': This uses a special transmission fluid sent under pressure by an oil Pump through the valve Body to control the clutches and the bands in order to control the planetary gear sets.
−
−	~~-'''Seals and gaskets''': Are used to keep the oil where it is supposed to be and prevent it from leaking out.~~
−
−	~~-'''The Torque Converter''': This acts like a clutch to allow the vehicle to come to a stop in gear while the engine is still running.~~
−
−	~~-'''Large gear pump''': What this does is move the transmission fluid around (we did not have this inside our transmission,~~
−
−	~~-'''Set of bands''': The role of these is to lock parts of a gearset~~
−
−	-'''Wet plate clutches''': This means the clutch runs in a bath of oil and thus gives better performance in getting the car to a smooth stop. Dry plate clutches run dry with no oil and thus more maintenance required.
−
−
−	Since the transmission was given to us damaged and drained of fluids, it remained inoperable when re-assembled. We discovered that many crucial parts were missing once we disassembled; including the gear pump.
−
−	~~This video shows how an automatic transmission works:~~
−	<object width="640" height="505"><param name="movie" value="http://www.youtube.com/v/LM6eyXSGGaE&hl=en&fs=1&color1=0x2b405b&color2=0x6b8ab6"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/LM6eyXSGGaE&hl=en&fs=1&color1=0x2b405b&color2=0x6b8ab6" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="505"></embed></object>
−	~~<embed src="http://www.youtube.com/watch?v=LM6eyXSGGaE" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="600" height="500"></embed>~~
−
−	~~'''Power flow of an automatic transmission system'''~~
−
−	The power flow is pretty straightforward. Mechanical power from the engine is delivered to the transmission through the torque converter. Then through the transmission and drive shaft, it reaches the final drive where it is split into two and delivered to the two back wheels (this is assuming it is a rear wheel drive and so no mechanical power is delivered to the front wheels)
−
−
−	~~'''== The significance of a transmission =='''~~
−
−	It is the device that is connected to the back of the engine and it sends the power produced from the engine to the drive wheels and depending on what kind of wheel drive it is (four wheel or two wheel drive), it will make the wheels rotate. The transmissions job is to make sure the power supplied by the engine is delivered to the wheels. This is primarily done through gear combination's. When the transmission is in neutral position, it disconnects the engine from the drive wheels, thus the car can back up as the wheels are now free to rotate in the opposite direction. It is the drive shaft which connects the rear of the transmission to the final drive which is found at the back of the rear axle (used to send power to the rear wheels). Without the presence of a transmission the engine would have no effect on the wheels of the car, thus no movement.

	==References==		==References==

@@ Line 1,012: / Line 1,012: @@
 ==After Assembly==
-The automatic transmission is probably one of the least understood transmission designs, as its design is very different from that of a manual transmission. Much of the confusion likely stems from the fact that automatic transmissions are thought by many to have "gears" in the same way that a manual transmission does. While an automatic transmission does have the standard settings, Drive, Reverse, 3, 2, 1, Neutral, and Park, these settings do not engage gears in the way one might think. An automatic transmission varies it's speed and direction with clutch packs.
+The automatic transmission is probably one of the least understood transmission designs, as its design is very different from that of a manual transmission. Much of the confusion likely stems from the fact that automatic transmissions are thought by many to have "gears" in the same way that a manual transmission does. While an automatic transmission does have the standard settings, Drive, Reverse, 3, 2, 1, Neutral, and Park, these settings do not engage gears in the way one might think. The two main differences between an automatic and manual transmission is that the automatic has no clutch pedal and most importantly, no gear shift. With an automatic transmission, once it is placed into drive mode, nothing else has to be done for the car to move. An automatic transmission varies it's speed and direction with clutch packs.
 '''A clutch pack'''