Windshield wiper assembly
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| '''Motor connection link''' | | '''Motor connection link''' | ||
*Rigid bar that transmits rotational power from the motor to Link LN3 | *Rigid bar that transmits rotational power from the motor to Link LN3 | ||
| - | | Loose connection || Little or no mechanical power transmitted to Link LN3 | + | | Loose connection || Little or no mechanical power transmitted to Link LN3 || 9 || Loosening of the motor connection nut due to vibrations in the motor || 4 |
|- | |- | ||
| '''Rubber Connections''' | | '''Rubber Connections''' | ||
*Attaches to connection links | *Attaches to connection links | ||
| - | | Corrosion || Doesn't connect other links and fails to transmit power to links | + | | Corrosion || Doesn't connect other links and fails to transmit power to links || 6 || Tensile stress and chemical corrosion weakens the rubber with time || 3 |
|- | |- | ||
| '''Rubber Thermal Mount''' | | '''Rubber Thermal Mount''' | ||
*Protects "Rigid Subassembly" and allows for mounting | *Protects "Rigid Subassembly" and allows for mounting | ||
| - | | Corrosion || Does not mount properly in car; Fails to rotate the wiper arm | + | | Corrosion || Does not mount properly in car; Fails to rotate the wiper arm || 7 || Overheating and use over time causes corrosion || 4 |
|- | |- | ||
| '''Cylindrical Rings''' | | '''Cylindrical Rings''' | ||
*Within "Rigid Subassembly" these act like bearings and allow for wiper arm rotation | *Within "Rigid Subassembly" these act like bearings and allow for wiper arm rotation | ||
| - | | Loss of grease || Causes grinding; Fails to rotate the wiper arm | + | | Loss of grease || Causes grinding; Fails to rotate the wiper arm || 5 || Excessive use || 5 |
|- | |- | ||
| '''Hose''' | | '''Hose''' | ||
*Transmits wiper fluid | *Transmits wiper fluid | ||
| - | | Holes || Cause wiper fluid to leak and not reach the nozzle | + | | Holes || Cause wiper fluid to leak and not reach the nozzle || 6 || Extreme temperature conditions can cause cracking; Foreign objects on windshield can puncture the hose || 9 |
|- | |- | ||
| '''Nozzle''' | | '''Nozzle''' | ||
*Sprays wiper fluid | *Sprays wiper fluid | ||
| - | | Chipping or breaking || Will not spray the wiper fluid onto the window | + | | Chipping or breaking || Will not spray the wiper fluid onto the window || 6 || Foreign objects on windshield can break plastic; Over-stressing easily causes cracking || 9 |
|- | |- | ||
| '''Spring Connector''' | | '''Spring Connector''' | ||
*Ensures that spring stays in place | *Ensures that spring stays in place | ||
| - | | Chipping or breaking || Does not secure spring thereby letting the wiper arms move away from the windshield | + | | Chipping or breaking || Does not secure spring thereby letting the wiper arms move away from the windshield || 7 || Foreign objects on windshield can break plastic; Over-stressing with taught spring causes cracking || 7 |
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Revision as of 15:00, 23 September 2007
Failure Modes and Effects Analysis
| Item and Function | Failure Mode | Effects of Failure | S | Causes of Failure | O | Design Controls | D | RPN | Recommended Actions | Responsibility | Comments |
|---|---|---|---|---|---|---|---|---|---|---|---|
Motor connection link
| Loose connection | Little or no mechanical power transmitted to Link LN3 | 9 | Loosening of the motor connection nut due to vibrations in the motor | 4 | ||||||
Rubber Connections
| Corrosion | Doesn't connect other links and fails to transmit power to links | 6 | Tensile stress and chemical corrosion weakens the rubber with time | 3 | ||||||
Rubber Thermal Mount
| Corrosion | Does not mount properly in car; Fails to rotate the wiper arm | 7 | Overheating and use over time causes corrosion | 4 | ||||||
Cylindrical Rings
| Loss of grease | Causes grinding; Fails to rotate the wiper arm | 5 | Excessive use | 5 | ||||||
Hose
| Holes | Cause wiper fluid to leak and not reach the nozzle | 6 | Extreme temperature conditions can cause cracking; Foreign objects on windshield can puncture the hose | 9 | ||||||
Nozzle
| Chipping or breaking | Will not spray the wiper fluid onto the window | 6 | Foreign objects on windshield can break plastic; Over-stressing easily causes cracking | 9 | ||||||
Spring Connector
| Chipping or breaking | Does not secure spring thereby letting the wiper arms move away from the windshield | 7 | Foreign objects on windshield can break plastic; Over-stressing with taught spring causes cracking | 7 |
