US20070000729A1 - Transmission case vent - Google Patents
Transmission case vent Download PDFInfo
- Publication number
- US20070000729A1 US20070000729A1 US11/174,426 US17442605A US2007000729A1 US 20070000729 A1 US20070000729 A1 US 20070000729A1 US 17442605 A US17442605 A US 17442605A US 2007000729 A1 US2007000729 A1 US 2007000729A1
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- United States
- Prior art keywords
- transmission case
- lubricant
- chamber
- vapor
- passageway
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/027—Gearboxes; Mounting gearing therein characterised by means for venting gearboxes, e.g. air breathers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
Definitions
- This invention relates generally to motorcycles, and more particularly to motorcycle transmissions.
- motorcycle transmissions typically include vented transmission cases for exhausting pressurized vapor built-up in the transmission cases to the atmosphere.
- a vented transmission case typically includes a hose fitting coupled to an upper portion of the transmission, such as on a transmission case top cover.
- An inverted U-shaped hose is typically coupled to the hose fitting to allow the pressurized vapor to exit the transmission case, while causing lubricant entrained in the pressurized vapor to condense and drain back to the transmission case.
- the present invention provides, in one aspect, a transmission case assembly adapted for use with a motorcycle.
- the transmission case assembly includes a transmission case having a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and a breather chamber in fluid communication with the gear chamber.
- the breather chamber is adapted to separate the lubricant-laden mist into lubricant and vapor and drain the separated lubricant into the gear chamber.
- the transmission case assembly also includes a transmission case cover coupled to the transmission case.
- the transmission case cover includes at least a portion of a passageway in fluid communication between the breather chamber and ambient air outside of the transmission case assembly.
- the passageway is adapted to exhaust the separated vapor outside of the transmission case assembly.
- the present invention provides, in another aspect, a transmission case assembly adapted for use with a motorcycle.
- the transmission case assembly includes a transmission case having a first interface portion, a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and a breather chamber in fluid communication with the gear chamber to receive the lubricant-laden mist.
- the breather chamber is adapted to at least partially facilitate separation of the lubricant-laden mist into lubricant and vapor.
- the transmission case assembly also includes a transmission case cover including a second interface portion coupled to the first interface portion.
- the transmission case cover includes a vapor chamber in fluid communication with the breather chamber and adapted to receive the separated vapor.
- the transmission case assembly further includes a tortuous passageway fluidly communicating the gear chamber and ambient air outside of the transmission case assembly, at least a portion of the tortuous passageway passing through the first and second interface portions.
- the present invention provides, in yet another aspect, a motorcycle including a front wheel, a rear wheel, a frame supported by the front and rear wheels, and a transmission case including a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and a breather chamber in fluid communication with the gear chamber.
- the breather chamber is adapted to separate the lubricant-laden mist into lubricant and vapor and drain the separated lubricant into the gear chamber.
- the motorcycle also includes a transmission case cover coupled to the transmission case.
- the transmission case cover includes at least a portion of a passageway in fluid communication between the breather chamber and ambient air outside of the transmission case assembly. The passageway is adapted to exhaust the separated vapor outside of the transmission case assembly.
- the present invention provides, in another aspect, a motorcycle including a front wheel, a rear wheel, a frame supported by the front and rear wheels, and a transmission case having a first interface portion, a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and a breather chamber in fluid communication with the gear chamber to receive the lubricant-laden mist.
- the breather chamber is adapted to at least partially facilitate separation of the lubricant-laden mist into lubricant and vapor.
- the motorcycle also includes a transmission case cover including a second interface portion coupled to the first interface portion.
- the transmission case cover includes a vapor chamber in fluid communication with the breather chamber and adapted to receive the separated vapor.
- the motorcycle further includes a tortuous passageway fluidly communicating the gear chamber and ambient air outside of the transmission case, at least a portion of the tortuous passageway passing through the first and second interface portions.
- the present invention provides, in yet another aspect, a transmission case cover adapted for use with a transmission case of a motorcycle.
- the transmission case includes a first interface portion and a breather chamber that receives a lubricant-laden mist during operation of the motorcycle.
- the breather chamber is adapted to at least partially facilitate separation of the lubricant-laden mist into lubricant and vapor.
- the transmission case cover includes a second interface portion adapted to couple to the first interface portion of the transmission case, a vapor chamber adapted to fluidly communicate with the breather chamber and adapted to receive the separated vapor, and a groove formed in the second interface portion to fluidly communicate the vapor chamber and ambient air outside of the transmission case, the groove adapted to exhaust the separated vapor outside of the transmission case.
- FIG. 1 is a front perspective view of a motorcycle embodying the present invention.
- FIG. 2 is an exploded, top perspective view of a transmission case assembly of the motorcycle of FIG. 1 , illustrating a transmission case cover and a baffle.
- FIG. 3 is a reverse perspective view of the transmission case cover of FIG. 2 , illustrating a portion of a passageway or a groove formed in the transmission case cover.
- FIG. 4 is an assembled, top view of the transmission case assembly of FIG. 2 .
- FIG. 5 is a cross-section view taken along line 5 - 5 of FIG. 4 , illustrating a gear chamber, breather chamber, and vapor chamber.
- FIG. 6 is a perspective, cross-section view taken along line 6 - 6 of FIG. 4 , illustrating a lubricant-laden mist entering the breather chamber and separated vapor entering the vapor chamber.
- FIG. 7 is a perspective, cross-section view taken along line 7 - 7 of FIG. 4 , illustrating the separated vapor passing through the vapor chamber.
- FIG. 8 is a perspective, partial cross-section view taken along line 8 - 8 of FIG. 4 , illustrating separated vapor exiting the transmission case assembly via the groove formed in the transmission case cover.
- FIG. 9 is an assembled, top perspective view of the transmission case assembly of FIG. 2 , illustrating a passageway between the transmission case cover and the transmission case through which the separated vapor can exit.
- FIG. 1 illustrates a motorcycle 10 including a drive assembly 14 , a frame 18 , a front fork assembly 22 , a swing arm or rear fork assembly 26 , a front wheel 30 , a rear wheel 34 , a seat 38 , and a fuel tank 42 .
- the frame 18 supports the drive assembly 14 , the front fork assembly 22 , the rear fork assembly 26 , the seat 38 , and the fuel tank 42 .
- the front fork assembly 22 is pivotally supported at a front end of the motorcycle 10 and supports the front wheel 30 .
- the front fork assembly 22 includes a pair of handle bars 46 for steering the motorcycle 10 .
- the rear fork assembly 26 is coupled to the frame 18 at a rear end of the motorcycle 10 and rotatably supports the rear wheel 34 .
- the seat 38 is coupled to the frame 18 and is configured for supporting a rider.
- the fuel tank 42 is supported by the frame 18 and provides fuel to the drive assembly 14 .
- the drive assembly 14 is preferably coupled to the frame 18 beneath the seat 38 between the front wheel 30 and the rear wheel 34 of the motorcycle 10 .
- the drive assembly 14 includes an engine 50 and a transmission 54 .
- the engine 50 and the transmission 54 comprise distinct, independent components of the drive assembly 14 .
- the engine 50 preferably comprises a V-twin engine 50 supported by the frame 18 forward of the transmission 54 .
- the engine 50 includes an output shaft (not shown), such as a crankshaft, which includes a primary drive sprocket (not shown) for driving a primary chain (not shown) in a conventional manner to power the transmission 54 .
- the transmission 54 includes a transmission case assembly 58 including a transmission case 62 enclosing the internal components (not shown) of the transmission 54 .
- a gear chamber 66 in the transmission case houses the internal components of the transmission 54 , particularly the transmission input and output shafts and various gears (not shown).
- Transmission lubricant is contained within the gear chamber 66 to lubricate the working components of the transmission (e.g., the input and output shafts and various gears).
- the transmission case assembly 58 also includes a pan 70 coupled to the transmission case 62 .
- the pan 70 includes a reservoir or sump 74 for containing engine lubricant, which is distributed throughout the engine 50 to lubricate the working components of the engine 50 .
- the engine lubricant is kept separately from the transmission lubricant, such that there is no cross-contamination between the engine lubricant and transmission lubricant.
- the transmission case 62 also includes a breather chamber 78 in fluid communication with the gear chamber 66 .
- an inlet aperture 82 fluidly communicates the gear chamber 66 and the breather chamber 78 , such that lubricant-laden mist in the gear chamber 66 may enter the breather chamber 78 via the inlet aperture 82 .
- An outlet aperture 86 fluidly communicating the breather chamber 78 and the gear chamber 66 allows separated lubricant to drain back to the gear chamber 66 .
- the transmission case assembly 58 also includes a transmission case cover 90 coupled to the transmission case 62 and a gasket 94 positioned between the transmission case cover 90 and the transmission case 62 .
- Multiple fasteners such as bolts 98 (see FIG. 9 ), may be used to secure the transmission case cover 90 and gasket 94 to the transmission case 62 .
- the transmission case cover 90 includes a partition or rib 102 that, when the transmission case cover 90 is coupled to the transmission case 62 , abuts an upper surface 104 of a side wall 106 of the breather chamber 78 to substantially isolate the breather chamber 78 and the gear chamber 66 .
- the inlet aperture 82 and outlet aperture 86 are the only paths to fluidly communicate the breather chamber 78 and gear chamber 66 .
- the gasket 94 includes a baffle 110 having a plurality of holes or apertures 114 therethrough.
- the baffle 110 acts as an upper wall of the breather chamber 78 , and a lower wall of a vapor chamber 118 formed in the transmission case cover 90 (see FIG. 5 ).
- the apertures 114 in the baffle 110 provide the only paths to fluidly communicate the breather chamber 78 and the vapor chamber 118 .
- the baffle 110 facilitates the separation of lubricant from the lubricant-laden mist in the breather chamber 78 and allows the separated vapor to enter the vapor chamber 118 via the apertures 114 .
- three apertures 114 are formed in the baffle 110 .
- more or less than three apertures 114 may be formed in the baffle 110 to fluidly communicate the breather chamber 78 and the vapor chamber 118 .
- the apertures 114 are formed in a corner of the baffle 110 on a side of the transmission 54 away from the apertures 82 , 86 .
- the apertures 114 may be formed in the middle of the baffle 110 , or along a side edge of the baffle 110 .
- the transmission case cover 90 includes a portion of a passageway or a groove 122 formed in an interface portion 126 of the transmission case cover 90 .
- the groove 122 is positioned adjacent the rib 102 on a side of the transmission case cover 90 that corresponds with the vapor chamber 118 .
- the groove 122 is positioned on a side of the transmission case cover 90 opposite from where the apertures 114 are disposed in the baffle 110 .
- the apertures 114 and groove 122 may be positioned on adjacent sides of the vapor chamber 118 .
- the groove 122 terminates before reaching the outer peripheral edge of the interface portion 126 .
- the transmission case 62 includes an ear 130 extending from an interface portion 134 .
- the ear 130 defines an upper surface 138 substantially coplanar with the interface portion 134 of the transmission case 62 .
- the ear 130 is substantially L-shaped, such that the ear 130 forms a groove 142 in the transmission case 62 between the upper surface 138 of the ear 130 and the interface portion 134 of the transmission case 62 .
- the groove 142 opens to or transitions to the exterior surface of the transmission case 62 .
- the gasket 94 also includes an ear 146 having substantially the same shape as the ear 130 on the transmission case 62 , such that the ear 146 on the gasket 94 is configured to lie over the ear 130 of the transmission case 62 .
- the groove 122 provides a passageway 150 between the respective interface portions 126 , 134 of the transmission case cover 90 and the transmission case 62 .
- the passageway 150 fluidly communicates the vapor chamber 118 and ambient air outside of the transmission case 62 .
- the passageway 150 is integrally formed with the transmission case cover 90 and the transmission case 62 , such that the transmission case cover 90 and the transmission case 62 may be cast with the grooves 122 , 142 .
- the internal working components of the transmission 54 (e.g., the shafts and gears) generate lubricant-laden mist in the gear chamber 66 .
- air or vapor in the gear chamber 66 may also be heated and expand.
- lubricant-laden mist may be carried from the gear chamber 66 to the breather chamber 78 .
- a solid arrow 154 represents lubricant-laden mist entering the breather chamber 78 through the inlet aperture 82 .
- the temperature of the lubricant-laden mist is reduced, thereby causing at least a portion of the lubricant entrained in the lubricant-laden mist to separate or drop out.
- swirling or turbulent motion of the lubricant-laden mist may cause at least a portion of the lubricant entrained in the lubricant-laden mist to separate or drop out.
- the separated lubricant accumulates in the bottom of the breather chamber 78 and subsequently drains back to the sump 74 via the outlet aperture 86 (indicated by dashed arrow 158 ).
- no additional structure is utilized in the breather chamber 78 to reduce the speed of the lubricant-laden mist or facilitate or enhance the turbulent motion of the lubricant-laden mist.
- additional structure may be positioned in the breather chamber 78 to reduce the speed of the lubricant-laden mist or enhance the swirling or turbulent motion of the lubricant-laden mist in the breather chamber 78 .
- the baffle 110 may also cause at least a portion of the lubricant entrained in the lubricant-laden mist to separate or drop out.
- the restriction provided by the apertures 114 in the baffle 110 may reduce the speed of the lubricant-laden mist, causing at least a portion of the lubricant entrained in the lubricant-laden mist to separate or drop out.
- the separated vapor (indicated by dashed arrow 162 ), therefore, may then enter the vapor chamber 118 through the apertures 114 in the baffle 110 .
- solid arrows 166 illustrate separated vapor moving upwardly through the apertures 114 in the baffle 110 and transversely through the vapor chamber 118 toward the passageway 150 .
- solid arrows 170 illustrate the separated vapor exhausting through the passageway 150 to a location outside of the transmission case assembly 58 .
- the separated vapor passes through the respective interface portions 126 , 134 of the transmission case cover 90 and the transmission case 62 to exhaust to a location outside of the transmission case assembly 58 .
- the separated vapor first passes through the portion of the passageway 150 defined by the groove 122 between the interface portion 126 of the transmission case cover 90 and the interface portion 134 of the transmission case 62 .
- the separated vapor then passes through the portion of the passageway 150 defined by the groove 142 between the ear 130 and the interface portion 134 of the transmission case 62 .
- the separated vapor may disperse and mix with the ambient air outside of the transmission case assembly 58 .
- the gear chamber 66 , the inlet aperture 82 , the breather chamber 78 , the apertures 114 in the baffle 110 , the vapor chamber 118 , the portion of the passageway 150 defined by the groove 122 between the interface portion 126 of the transmission case cover 90 and the interface portion 134 of the transmission case 62 , and the portion of the passageway 150 defined by the groove 142 between the ear 130 and the interface portion 134 of the transmission case 62 may combine to yield a tortuous passageway through which lubricant-laden mist and/or separated vapor must pass before the separated vapor is exhausted outside of the transmission case assembly 58 .
- Such a tortuous passageway may reduce the amount lubricant-laden mist that escapes from the transmission case assembly 58 .
- Such a tortuous passageway may also substantially prevent foreign liquids (e.g., water) from entering the transmission case assembly 58 .
Abstract
The present invention provides a transmission case assembly adapted for use with a motorcycle. The transmission case assembly includes a transmission case having a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and a breather chamber in fluid communication with the gear chamber. The breather chamber is adapted to separate the lubricant-laden mist into lubricant and vapor and drain the separated lubricant into the gear chamber. The transmission case assembly also includes a transmission case cover coupled to the transmission case. The transmission case cover includes at least a portion of a passageway in fluid communication between the breather chamber and ambient air outside of the transmission case assembly. The passageway is adapted to exhaust the separated vapor outside of the transmission case assembly.
Description
- This invention relates generally to motorcycles, and more particularly to motorcycle transmissions.
- Motorcycle transmissions typically include vented transmission cases for exhausting pressurized vapor built-up in the transmission cases to the atmosphere. Such a vented transmission case typically includes a hose fitting coupled to an upper portion of the transmission, such as on a transmission case top cover. An inverted U-shaped hose is typically coupled to the hose fitting to allow the pressurized vapor to exit the transmission case, while causing lubricant entrained in the pressurized vapor to condense and drain back to the transmission case.
- The present invention provides, in one aspect, a transmission case assembly adapted for use with a motorcycle. The transmission case assembly includes a transmission case having a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and a breather chamber in fluid communication with the gear chamber. The breather chamber is adapted to separate the lubricant-laden mist into lubricant and vapor and drain the separated lubricant into the gear chamber. The transmission case assembly also includes a transmission case cover coupled to the transmission case. The transmission case cover includes at least a portion of a passageway in fluid communication between the breather chamber and ambient air outside of the transmission case assembly. The passageway is adapted to exhaust the separated vapor outside of the transmission case assembly.
- The present invention provides, in another aspect, a transmission case assembly adapted for use with a motorcycle. The transmission case assembly includes a transmission case having a first interface portion, a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and a breather chamber in fluid communication with the gear chamber to receive the lubricant-laden mist. The breather chamber is adapted to at least partially facilitate separation of the lubricant-laden mist into lubricant and vapor. The transmission case assembly also includes a transmission case cover including a second interface portion coupled to the first interface portion. The transmission case cover includes a vapor chamber in fluid communication with the breather chamber and adapted to receive the separated vapor. The transmission case assembly further includes a tortuous passageway fluidly communicating the gear chamber and ambient air outside of the transmission case assembly, at least a portion of the tortuous passageway passing through the first and second interface portions.
- The present invention provides, in yet another aspect, a motorcycle including a front wheel, a rear wheel, a frame supported by the front and rear wheels, and a transmission case including a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and a breather chamber in fluid communication with the gear chamber. The breather chamber is adapted to separate the lubricant-laden mist into lubricant and vapor and drain the separated lubricant into the gear chamber. The motorcycle also includes a transmission case cover coupled to the transmission case. The transmission case cover includes at least a portion of a passageway in fluid communication between the breather chamber and ambient air outside of the transmission case assembly. The passageway is adapted to exhaust the separated vapor outside of the transmission case assembly.
- The present invention provides, in another aspect, a motorcycle including a front wheel, a rear wheel, a frame supported by the front and rear wheels, and a transmission case having a first interface portion, a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and a breather chamber in fluid communication with the gear chamber to receive the lubricant-laden mist. The breather chamber is adapted to at least partially facilitate separation of the lubricant-laden mist into lubricant and vapor. The motorcycle also includes a transmission case cover including a second interface portion coupled to the first interface portion. The transmission case cover includes a vapor chamber in fluid communication with the breather chamber and adapted to receive the separated vapor. The motorcycle further includes a tortuous passageway fluidly communicating the gear chamber and ambient air outside of the transmission case, at least a portion of the tortuous passageway passing through the first and second interface portions.
- The present invention provides, in yet another aspect, a transmission case cover adapted for use with a transmission case of a motorcycle. The transmission case includes a first interface portion and a breather chamber that receives a lubricant-laden mist during operation of the motorcycle. The breather chamber is adapted to at least partially facilitate separation of the lubricant-laden mist into lubricant and vapor. The transmission case cover includes a second interface portion adapted to couple to the first interface portion of the transmission case, a vapor chamber adapted to fluidly communicate with the breather chamber and adapted to receive the separated vapor, and a groove formed in the second interface portion to fluidly communicate the vapor chamber and ambient air outside of the transmission case, the groove adapted to exhaust the separated vapor outside of the transmission case.
- Other features and aspects of the present invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.
- In the drawings, wherein like reference numerals indicate like parts:
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FIG. 1 is a front perspective view of a motorcycle embodying the present invention. -
FIG. 2 is an exploded, top perspective view of a transmission case assembly of the motorcycle ofFIG. 1 , illustrating a transmission case cover and a baffle. -
FIG. 3 is a reverse perspective view of the transmission case cover ofFIG. 2 , illustrating a portion of a passageway or a groove formed in the transmission case cover. -
FIG. 4 is an assembled, top view of the transmission case assembly ofFIG. 2 . -
FIG. 5 is a cross-section view taken along line 5-5 ofFIG. 4 , illustrating a gear chamber, breather chamber, and vapor chamber. -
FIG. 6 is a perspective, cross-section view taken along line 6-6 ofFIG. 4 , illustrating a lubricant-laden mist entering the breather chamber and separated vapor entering the vapor chamber. -
FIG. 7 is a perspective, cross-section view taken along line 7-7 ofFIG. 4 , illustrating the separated vapor passing through the vapor chamber. -
FIG. 8 is a perspective, partial cross-section view taken along line 8-8 ofFIG. 4 , illustrating separated vapor exiting the transmission case assembly via the groove formed in the transmission case cover. -
FIG. 9 is an assembled, top perspective view of the transmission case assembly ofFIG. 2 , illustrating a passageway between the transmission case cover and the transmission case through which the separated vapor can exit. - Before any features of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including”, “having”, and “comprising” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. The use of letters to identify elements of a method or process is simply for identification and is not meant to indicate that the elements should be performed in a particular order.
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FIG. 1 illustrates amotorcycle 10 including adrive assembly 14, aframe 18, afront fork assembly 22, a swing arm orrear fork assembly 26, afront wheel 30, arear wheel 34, a seat 38, and afuel tank 42. Theframe 18 supports thedrive assembly 14, thefront fork assembly 22, therear fork assembly 26, the seat 38, and thefuel tank 42. Thefront fork assembly 22 is pivotally supported at a front end of themotorcycle 10 and supports thefront wheel 30. Thefront fork assembly 22 includes a pair ofhandle bars 46 for steering themotorcycle 10. Therear fork assembly 26 is coupled to theframe 18 at a rear end of themotorcycle 10 and rotatably supports therear wheel 34. The seat 38 is coupled to theframe 18 and is configured for supporting a rider. Thefuel tank 42 is supported by theframe 18 and provides fuel to thedrive assembly 14. - The
drive assembly 14 is preferably coupled to theframe 18 beneath the seat 38 between thefront wheel 30 and therear wheel 34 of themotorcycle 10. With continued reference toFIG. 1 , thedrive assembly 14 includes anengine 50 and atransmission 54. Theengine 50 and thetransmission 54 comprise distinct, independent components of thedrive assembly 14. Theengine 50 preferably comprises a V-twin engine 50 supported by theframe 18 forward of thetransmission 54. Theengine 50 includes an output shaft (not shown), such as a crankshaft, which includes a primary drive sprocket (not shown) for driving a primary chain (not shown) in a conventional manner to power thetransmission 54. - With reference to
FIG. 2 , thetransmission 54 includes atransmission case assembly 58 including atransmission case 62 enclosing the internal components (not shown) of thetransmission 54. Agear chamber 66 in the transmission case (seeFIG. 5 ) houses the internal components of thetransmission 54, particularly the transmission input and output shafts and various gears (not shown). Transmission lubricant is contained within thegear chamber 66 to lubricate the working components of the transmission (e.g., the input and output shafts and various gears). Thetransmission case assembly 58 also includes apan 70 coupled to thetransmission case 62. Thepan 70 includes a reservoir orsump 74 for containing engine lubricant, which is distributed throughout theengine 50 to lubricate the working components of theengine 50. The engine lubricant is kept separately from the transmission lubricant, such that there is no cross-contamination between the engine lubricant and transmission lubricant. - The
transmission case 62 also includes abreather chamber 78 in fluid communication with thegear chamber 66. With reference toFIG. 6 , aninlet aperture 82 fluidly communicates thegear chamber 66 and thebreather chamber 78, such that lubricant-laden mist in thegear chamber 66 may enter thebreather chamber 78 via theinlet aperture 82. Anoutlet aperture 86 fluidly communicating thebreather chamber 78 and thegear chamber 66 allows separated lubricant to drain back to thegear chamber 66. - With reference to
FIG. 2 , thetransmission case assembly 58 also includes a transmission case cover 90 coupled to thetransmission case 62 and agasket 94 positioned between the transmission case cover 90 and thetransmission case 62. Multiple fasteners, such as bolts 98 (seeFIG. 9 ), may be used to secure the transmission case cover 90 andgasket 94 to thetransmission case 62. With reference toFIGS. 3, 6 , and 7, the transmission case cover 90 includes a partition orrib 102 that, when the transmission case cover 90 is coupled to thetransmission case 62, abuts anupper surface 104 of aside wall 106 of thebreather chamber 78 to substantially isolate thebreather chamber 78 and thegear chamber 66. Due to the seal created by therib 102,gasket 94, andside wall 106 of thebreather chamber 78, theinlet aperture 82 andoutlet aperture 86 are the only paths to fluidly communicate thebreather chamber 78 andgear chamber 66. - With reference to
FIGS. 2, 6 , and 7, thegasket 94 includes abaffle 110 having a plurality of holes orapertures 114 therethrough. When thegasket 94 is coupled between the transmission case cover 90 and thetransmission case 62, thebaffle 110 acts as an upper wall of thebreather chamber 78, and a lower wall of avapor chamber 118 formed in the transmission case cover 90 (seeFIG. 5 ). As shown inFIGS. 6 and 7 , theapertures 114 in thebaffle 110 provide the only paths to fluidly communicate thebreather chamber 78 and thevapor chamber 118. Generally, thebaffle 110 facilitates the separation of lubricant from the lubricant-laden mist in thebreather chamber 78 and allows the separated vapor to enter thevapor chamber 118 via theapertures 114. In the illustrated construction, threeapertures 114 are formed in thebaffle 110. Alternatively, more or less than threeapertures 114 may be formed in thebaffle 110 to fluidly communicate thebreather chamber 78 and thevapor chamber 118. Also, in the illustrated construction, theapertures 114 are formed in a corner of thebaffle 110 on a side of thetransmission 54 away from theapertures apertures 114 may be formed in the middle of thebaffle 110, or along a side edge of thebaffle 110. - With reference to
FIG. 3 , the transmission case cover 90 includes a portion of a passageway or agroove 122 formed in aninterface portion 126 of the transmission case cover 90. In the illustrated construction, thegroove 122 is positioned adjacent therib 102 on a side of the transmission case cover 90 that corresponds with thevapor chamber 118. As such, thegroove 122 is positioned on a side of the transmission case cover 90 opposite from where theapertures 114 are disposed in thebaffle 110. Alternatively, theapertures 114 and groove 122 may be positioned on adjacent sides of thevapor chamber 118. Also, in the illustrated construction, thegroove 122 terminates before reaching the outer peripheral edge of theinterface portion 126. - With reference to
FIG. 2 , thetransmission case 62 includes anear 130 extending from aninterface portion 134. Theear 130 defines anupper surface 138 substantially coplanar with theinterface portion 134 of thetransmission case 62. Theear 130 is substantially L-shaped, such that theear 130 forms agroove 142 in thetransmission case 62 between theupper surface 138 of theear 130 and theinterface portion 134 of thetransmission case 62. As shown inFIG. 2 , thegroove 142 opens to or transitions to the exterior surface of thetransmission case 62. Thegasket 94 also includes anear 146 having substantially the same shape as theear 130 on thetransmission case 62, such that theear 146 on thegasket 94 is configured to lie over theear 130 of thetransmission case 62. - With reference to
FIG. 8 , when the transmission case cover 90 is coupled to thetransmission case 62, thegroove 122 provides apassageway 150 between therespective interface portions transmission case 62. Thepassageway 150 fluidly communicates thevapor chamber 118 and ambient air outside of thetransmission case 62. In the illustrated construction, thepassageway 150 is integrally formed with the transmission case cover 90 and thetransmission case 62, such that the transmission case cover 90 and thetransmission case 62 may be cast with thegrooves - During operation of the
motorcycle 10, the internal working components of the transmission 54 (e.g., the shafts and gears) generate lubricant-laden mist in thegear chamber 66. In addition, as the transmission lubricant is heated, air or vapor in thegear chamber 66 may also be heated and expand. As the air or vapor in thegear chamber 66 expands, lubricant-laden mist may be carried from thegear chamber 66 to thebreather chamber 78. As shown inFIG. 6 , asolid arrow 154 represents lubricant-laden mist entering thebreather chamber 78 through theinlet aperture 82. Once in thebreather chamber 78, the temperature of the lubricant-laden mist is reduced, thereby causing at least a portion of the lubricant entrained in the lubricant-laden mist to separate or drop out. In addition, swirling or turbulent motion of the lubricant-laden mist may cause at least a portion of the lubricant entrained in the lubricant-laden mist to separate or drop out. The separated lubricant accumulates in the bottom of thebreather chamber 78 and subsequently drains back to thesump 74 via the outlet aperture 86 (indicated by dashed arrow 158). In the illustrated construction, no additional structure is utilized in thebreather chamber 78 to reduce the speed of the lubricant-laden mist or facilitate or enhance the turbulent motion of the lubricant-laden mist. Alternatively, additional structure may be positioned in thebreather chamber 78 to reduce the speed of the lubricant-laden mist or enhance the swirling or turbulent motion of the lubricant-laden mist in thebreather chamber 78. - The
baffle 110 may also cause at least a portion of the lubricant entrained in the lubricant-laden mist to separate or drop out. Particularly, the restriction provided by theapertures 114 in thebaffle 110 may reduce the speed of the lubricant-laden mist, causing at least a portion of the lubricant entrained in the lubricant-laden mist to separate or drop out. The separated vapor (indicated by dashed arrow 162), therefore, may then enter thevapor chamber 118 through theapertures 114 in thebaffle 110. - With reference to
FIG. 7 ,solid arrows 166 illustrate separated vapor moving upwardly through theapertures 114 in thebaffle 110 and transversely through thevapor chamber 118 toward thepassageway 150. With reference toFIG. 8 ,solid arrows 170 illustrate the separated vapor exhausting through thepassageway 150 to a location outside of thetransmission case assembly 58. In other words, the separated vapor passes through therespective interface portions transmission case 62 to exhaust to a location outside of thetransmission case assembly 58. - Specifically, with continued reference to
FIG. 8 , the separated vapor first passes through the portion of thepassageway 150 defined by thegroove 122 between theinterface portion 126 of the transmission case cover 90 and theinterface portion 134 of thetransmission case 62. The separated vapor then passes through the portion of thepassageway 150 defined by thegroove 142 between theear 130 and theinterface portion 134 of thetransmission case 62. Finally, as thegroove 142 opens to the exterior surface of thetransmission case 62, the separated vapor may disperse and mix with the ambient air outside of thetransmission case assembly 58. - With reference to
FIGS. 6-9 , thegear chamber 66, theinlet aperture 82, thebreather chamber 78, theapertures 114 in thebaffle 110, thevapor chamber 118, the portion of thepassageway 150 defined by thegroove 122 between theinterface portion 126 of the transmission case cover 90 and theinterface portion 134 of thetransmission case 62, and the portion of thepassageway 150 defined by thegroove 142 between theear 130 and theinterface portion 134 of thetransmission case 62 may combine to yield a tortuous passageway through which lubricant-laden mist and/or separated vapor must pass before the separated vapor is exhausted outside of thetransmission case assembly 58. Such a tortuous passageway may reduce the amount lubricant-laden mist that escapes from thetransmission case assembly 58. Such a tortuous passageway may also substantially prevent foreign liquids (e.g., water) from entering thetransmission case assembly 58. - Various aspects of the invention are set forth in the following claims.
Claims (32)
1. A transmission case assembly adapted for use with a motorcycle, the transmission case assembly comprising:
a transmission case including
a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and
a breather chamber in fluid communication with the gear chamber, the breather chamber adapted to separate the lubricant-laden mist into lubricant and vapor and drain the separated lubricant into the gear chamber; and
a transmission case cover coupled to the transmission case, the transmission case cover including at least a portion of a passageway in fluid communication between the breather chamber and ambient air outside of the transmission case assembly, the passageway adapted to exhaust the separated vapor outside of the transmission case assembly.
2. The transmission case assembly of claim 1 , further comprising:
a vapor chamber in the transmission case cover, wherein the passageway is in fluid communication between the vapor chamber and ambient air outside of the transmission case assembly; and
a baffle positioned between the breather chamber and the vapor chamber, wherein the baffle at least partially restricts fluid flow between the breather chamber and the vapor chamber, and wherein the baffle is adapted to facilitate separation of the lubricant-laden mist into lubricant and vapor.
3. The transmission case assembly of claim 2 , wherein the baffle comprises a gasket including at least one aperture to fluidly communicate the breather chamber and the vapor chamber.
4. The transmission case assembly of claim 3 , wherein the at least one aperture is positioned on a side of the gasket opposite the portion of the passageway in the transmission case cover.
5. The transmission case assembly of claim 1 , wherein the transmission case includes a first interface portion, wherein the transmission case cover includes a second interface portion coupled to the first interface portion, and wherein the passageway passes through the first interface portion and the second interface portion.
6. The transmission case assembly of claim 5 , further comprising an ear extending from the first interface portion, wherein the ear at least partially defines a groove in the transmission case, and wherein the groove comprises a portion of the passageway.
7. The transmission case assembly of claim 1 , wherein the transmission case cover includes a groove comprising the portion of the passageway.
8. The transmission case assembly of claim 1 , wherein the passageway is integrally formed with the transmission case cover and the transmission case.
9. A transmission case assembly adapted for use with a motorcycle, the transmission case assembly comprising:
a transmission case including
a first interface portion,
a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and
a breather chamber in fluid communication with the gear chamber to receive the lubricant-laden mist, the breather chamber adapted to at least partially facilitate separation of the lubricant-laden mist into lubricant and vapor;
a transmission case cover including a second interface portion coupled to the first interface portion, the transmission case cover including a vapor chamber in fluid communication with the breather chamber and adapted to receive the separated vapor; and
a tortuous passageway fluidly communicating the gear chamber and ambient air outside of the transmission case assembly, at least a portion of the tortuous passageway passing through the first and second interface portions.
10. The transmission case assembly of claim 9 , further comprising a baffle positioned between the breather chamber and the vapor chamber, the baffle at least partially restricting fluid flow between the breather chamber and the vapor chamber, the baffle adapted to facilitate separation of the lubricant-laden mist into lubricant and vapor, the breather chamber adapted to accumulate the separated lubricant and drain the separated lubricant into the gear chamber, wherein at least a portion of the tortuous passageway passes through the baffle.
11. The transmission case assembly of claim 10 , wherein the baffle comprises a gasket including at least one aperture to fluidly communicate the breather chamber and the vapor chamber.
12. The transmission case assembly of claim 11 , wherein the at least one aperture is positioned on a side of the gasket opposite the portion of the tortuous passageway passing through the first and second interface portions.
13. The transmission case assembly of claim 9 , further comprising an ear extending from the first interface portion, wherein the ear at least partially defines a groove in the transmission case, and wherein the groove comprises a portion of the tortuous passageway.
14. The transmission case assembly of claim 9 , wherein the second interface portion includes a groove, and wherein the groove comprises a portion of the tortuous passageway.
15. The transmission case assembly of claim 9 , wherein at least a portion of the tortuous passageway is integrally formed with the transmission case cover and the transmission case.
16. A motorcycle comprising:
a front wheel;
a rear wheel;
a frame supported by the front and rear wheels;
a transmission case including
a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and
a breather chamber in fluid communication with the gear chamber, the breather chamber adapted to separate the lubricant-laden mist into lubricant and vapor and drain the separated lubricant into the gear chamber; and
a transmission case cover coupled to the transmission case, the transmission case cover including at least a portion of a passageway in fluid communication between the breather chamber and ambient air outside of the transmission case assembly, the passageway adapted to exhaust the separated vapor outside of the transmission case assembly.
17. The transmission case assembly of claim 16 , further comprising:
a vapor chamber in the transmission case cover, wherein the passageway is in fluid communication between the vapor chamber and ambient air outside of the transmission case assembly; and
a baffle positioned between the breather chamber and the vapor chamber, wherein the baffle at least partially restricts fluid flow between the breather chamber and the vapor chamber, and wherein the baffle is adapted to facilitate separation of the lubricant-laden mist into lubricant and vapor.
18. The motorcycle of claim 17 , wherein the baffle comprises a gasket including at least one aperture to fluidly communicate the breather chamber and the vapor chamber.
19. The motorcycle of claim 18 , wherein the at least one aperture is positioned on a side of the gasket opposite the portion of the passageway in the transmission case cover.
20. The motorcycle of claim 16 , wherein the transmission case includes a first interface portion, wherein the transmission case cover includes a second interface portion engaged with the first interface portion, and wherein the passageway passes through the first interface portion and the second interface portion.
21. The motorcycle of claim 20 , further comprising an ear extending from the first interface portion, wherein the ear at least partially defines a groove in the transmission case, and wherein the groove comprises a portion of the passageway.
22. The motorcycle of claim 16 , wherein the transmission case cover includes a groove comprising the portion of the passageway.
23. The motorcycle of claim 16 , wherein the passageway is integrally formed with the transmission case cover and the transmission case.
24. A motorcycle comprising:
a front wheel;
a rear wheel;
a frame supported by the front and rear wheels;
a transmission case including
a first interface portion,
a gear chamber adapted to contain a lubricant and generate a lubricant-laden mist during operation of the motorcycle, and
a breather chamber in fluid communication with the gear chamber to receive the lubricant-laden mist, the breather chamber adapted to at least partially facilitate separation of the lubricant-laden mist into lubricant and vapor;
a transmission case cover including a second interface portion coupled to the first interface portion, the transmission case cover including a vapor chamber in fluid communication with the breather chamber and adapted to receive the separated vapor; and
a tortuous passageway fluidly communicating the gear chamber and ambient air outside of the transmission case, at least a portion of the tortuous passageway passing through the first and second interface portions.
25. The motorcycle of claim 24 , further comprising a baffle positioned between the breather chamber and the vapor chamber, the baffle at least partially restricting fluid flow between the breather chamber and the vapor chamber, the baffle adapted to facilitate separation of the lubricant-laden mist into lubricant and vapor, the breather chamber adapted to accumulate the separated lubricant and drain the separated lubricant into the gear chamber, wherein at least a portion of the tortuous passageway passes through the baffle.
26. The motorcycle of claim 25 , wherein the baffle comprises a gasket including at least one aperture to fluidly communicate the breather chamber and the vapor chamber.
27. The motorcycle of claim 26 , wherein the at least one aperture is positioned on a side of the gasket opposite the portion of the tortuous passageway passing through the first and second interface portions.
28. The motorcycle of claim 24 , further comprising an ear extending from the first interface portion, wherein the ear at least partially defines a groove in the transmission case, and wherein the groove comprises a portion of the tortuous passageway.
29. The motorcycle of claim 24 , wherein the second interface portion includes a groove, and wherein the groove comprises a portion of the tortuous passageway.
30. The motorcycle of claim 24 , wherein at least a portion of the tortuous passageway is integrally formed with the transmission case cover and the transmission case.
31. A transmission case cover adapted for use with a transmission case of a motorcycle, the transmission case including a first interface portion and a breather chamber that receives a lubricant-laden mist during operation of the motorcycle, the breather chamber adapted to at least partially facilitate separation of the lubricant-laden mist into lubricant and vapor, the transmission case cover comprising:
a second interface portion adapted to couple to the first interface portion of the transmission case;
a vapor chamber adapted to fluidly communicate with the breather chamber and adapted to receive the separated vapor; and
a groove formed in the second interface portion to fluidly communicate the vapor chamber and ambient air outside of the transmission case, the groove adapted to exhaust the separated vapor outside of the transmission case.
32. The transmission case cover of claim 31 , wherein the groove is integrally formed with the transmission case cover.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/174,426 US20070000729A1 (en) | 2005-07-01 | 2005-07-01 | Transmission case vent |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/174,426 US20070000729A1 (en) | 2005-07-01 | 2005-07-01 | Transmission case vent |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070000729A1 true US20070000729A1 (en) | 2007-01-04 |
Family
ID=37588158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/174,426 Abandoned US20070000729A1 (en) | 2005-07-01 | 2005-07-01 | Transmission case vent |
Country Status (1)
Country | Link |
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US (1) | US20070000729A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008155195A1 (en) * | 2007-06-16 | 2008-12-24 | Zf Friedrichshafen Ag | Arrangement of the ventilation unit for a transmission of a motor vehicle |
US20130098925A1 (en) * | 2011-10-21 | 2013-04-25 | Crown Packaging Technology, Inc. | Can End Having An Annular Rib |
JP2013190009A (en) * | 2012-03-13 | 2013-09-26 | Toyota Motor Corp | Driving device |
WO2014132271A1 (en) * | 2013-02-28 | 2014-09-04 | Tvs Motor Company Limited | Crankcase ventilation |
EP2868879A1 (en) * | 2013-10-30 | 2015-05-06 | Yamaha Hatsudoki Kabushiki Kaisha | Engine and straddle-type vehicle including the same |
JP2017150606A (en) * | 2016-02-25 | 2017-08-31 | 本田技研工業株式会社 | Breather device |
US10072749B2 (en) | 2016-04-18 | 2018-09-11 | Magna Powertrain Of America, Inc. | Transfer case with vent/oil deflector assembly |
US20230011796A1 (en) * | 2021-07-12 | 2023-01-12 | Custom Performance, L.L.C., dba Trask Performance | Vented transmission cover |
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US4468979A (en) * | 1980-07-25 | 1984-09-04 | Honda Giken Kogyo Kabushiki Kaisha | Breather ventilation system of power-transmission casing for use in motorcycle |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008155195A1 (en) * | 2007-06-16 | 2008-12-24 | Zf Friedrichshafen Ag | Arrangement of the ventilation unit for a transmission of a motor vehicle |
US20130098925A1 (en) * | 2011-10-21 | 2013-04-25 | Crown Packaging Technology, Inc. | Can End Having An Annular Rib |
JP2013190009A (en) * | 2012-03-13 | 2013-09-26 | Toyota Motor Corp | Driving device |
WO2014132271A1 (en) * | 2013-02-28 | 2014-09-04 | Tvs Motor Company Limited | Crankcase ventilation |
EP2868879A1 (en) * | 2013-10-30 | 2015-05-06 | Yamaha Hatsudoki Kabushiki Kaisha | Engine and straddle-type vehicle including the same |
US9546579B2 (en) | 2013-10-30 | 2017-01-17 | Yamaha Hatsudoki Kabushiki Kaisha | Engine and straddle-type vehicle including the same |
JP2017150606A (en) * | 2016-02-25 | 2017-08-31 | 本田技研工業株式会社 | Breather device |
CN107120415A (en) * | 2016-02-25 | 2017-09-01 | 本田技研工业株式会社 | Air-breather |
US10030759B2 (en) | 2016-02-25 | 2018-07-24 | Honda Motor Co., Ltd. | Breather device |
US10072749B2 (en) | 2016-04-18 | 2018-09-11 | Magna Powertrain Of America, Inc. | Transfer case with vent/oil deflector assembly |
US20230011796A1 (en) * | 2021-07-12 | 2023-01-12 | Custom Performance, L.L.C., dba Trask Performance | Vented transmission cover |
US11920670B2 (en) * | 2021-07-12 | 2024-03-05 | Custom Performance, L.L.C. | Vented transmission cover |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HARLEY-DAVIDSON MOTOR COMPANY GROUP, INC., WISCONS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LUND, BEN M.;SCHANZ, JOHN;RUSCH, SEAN A.;REEL/FRAME:016905/0771;SIGNING DATES FROM 20050803 TO 20050804 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |