US20230294025A1 - Transmission oil filter assembly - Google Patents
Transmission oil filter assembly Download PDFInfo
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- US20230294025A1 US20230294025A1 US18/321,138 US202318321138A US2023294025A1 US 20230294025 A1 US20230294025 A1 US 20230294025A1 US 202318321138 A US202318321138 A US 202318321138A US 2023294025 A1 US2023294025 A1 US 2023294025A1
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- inlet
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- outlet
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 32
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 3
- 230000003993 interaction Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 20
- 230000008569 process Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000001010 compromised effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/30—Filter housing constructions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
- B01D35/0273—Filtering elements with a horizontal or inclined rotation or symmetry axis submerged in tanks or reservoirs
-
- 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
- F01M1/00—Pressure lubrication
- F01M1/10—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters
-
- 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
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0402—Cleaning of lubricants, e.g. filters or magnets
- F16H57/0404—Lubricant filters
-
- 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
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
- F16H57/0441—Arrangements of pumps
-
- 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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
- F16H61/0031—Supply of control fluid; Pumps therefore using auxiliary pumps, e.g. pump driven by a different power source than the engine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/30—Filter housing constructions
- B01D2201/301—Details of removable closures, lids, caps, filter heads
- B01D2201/302—Details of removable closures, lids, caps, filter heads having inlet or outlet ports
- B01D2201/303—Details of removable closures, lids, caps, filter heads having inlet or outlet ports not arranged concentrically
-
- 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
- F01M1/00—Pressure lubrication
- F01M1/10—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters
- F01M2001/105—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the layout of the purification arrangements
Definitions
- This disclosure relates to the field of transmission systems. More particularly, the disclosure pertains to a filter assembly.
- Automatic transmission fluid serves many functions in a modern automatic transmission. Pressurized fluid may be used to engage friction clutches in order to establish a power flow path with a desired speed ratio. Fluid lubricates gears and bearings. Excess heat is removed by fluid flowing over various components. When the fluid contain contaminants, it may be less effective in these functions and may cause failures such as stuck valves. Therefore, transmissions often include fluid filters.
- Filters may be placed on either the inlet (low pressure) side of a transmission pump or on the outlet (high pressure) side of a transmission pump.
- Transmission oil filters typically contain a filtration media. The media may be pleated to increase the surface area in a limited space.
- a transmission includes a filter, an engine driven pump, and an electric pump.
- the a filter has a bottom surface defining a filter inlet, a top surface defining a rear outlet hole, and a front outlet tube projecting from a front end at an oblique angle relative to the top surface.
- the filter may further include a rear extension projecting from a rear end in which case the rear outlet hole is defined in the top surface over the rear extension.
- the engine driven pump has an inlet sealed to the front outlet tube by a radial seal.
- the electric pump is sealed to the top surface around the rear outlet hole by a compression seal.
- the transmission may also include two bolts fastening the rear extension to the electric pump and compressing the compression seal.
- a filter assembly includes a main body, a rear extension, and a front outlet tube.
- the main body is adapted to fit into a transmission sump, contains filter media, and has a bottom surface defining an inlet.
- the rear extension extends from the main body and has a top surface defining a rear outlet hole.
- the rear extension may further define two mounting holes.
- the rear outlet hole may be between the two mounting holes.
- a compression seal may surround the rear outlet hole.
- the front outlet tube projects from a front of the main body at an oblique angle relative to the top surface.
- a radial seal may be arranged around the front outlet tube.
- a method of assembling a transmission includes installing an engine-driven pump and an electric pump, sealing a first outlet of a filter to an inlet of the engine-driven pump using a radial seal, positioning a second outlet of the filter adjacent to an inlet of the electric pump, and bolting the filter to the electric pump to compress a seal between the filter and the inlet of the electric pump.
- Positioning the second outlet of the filter adjacent to the inlet of the electric pump may include moving the filter parallel to an axis of an inlet tube of the engine-driven pump and diagonally with respect to an inlet of the electric pump.
- the engine driven pump and the electric pump may be fastened directly to a transmission case.
- FIG. 1 is a schematic diagram of a vehicle transmission.
- FIG. 2 is a bottom view transmission suction filter.
- FIG. 3 is a side cross section of the filter of FIG. 2 .
- FIG. 4 is a rear cross section of the filter of FIG. 2 .
- FIG. 5 is a flow chart of a process of assembling the transmission FIG. 1 using the filter of FIGS. 2 - 4 .
- FIG. 1 schematically illustrates a transmission hydraulic system.
- Bold lines indicate mechanical power flow.
- Thin solid lines indicate flow of hydraulic fluid.
- Dashed lines indicate electrical signals.
- Transmission input shaft 10 is connected to the vehicle crankshaft. Power from the engine is delivered to torque converter 12 which drives turbine shaft 14 . Clutches within gearbox 16 are engaged to establish a power flow path from turbine shaft 14 to output shaft 18 . Different power flow paths having different speed ratios may be established by engaging different clutches.
- output shaft 18 is connected to a driveshaft which transmits the power to a rear differential and then to rear wheels.
- a transfer case may be installed between the output shaft and the driveshaft to divert a portion of the power to a front differential and then to front wheels.
- the output shaft may transmit power to a front differential via gears or a chain.
- Mechanical pump 20 draws fluid from sump 22 , through filter 24 , and delivers the fluid, at increased pressure, to valve body 26 .
- the pressure at which fluid enters the valve body may be called line pressure.
- Controller 28 commands a network of control valves within the valve body to deliver fluid to torque converter and gearbox components at desired pressures less than line pressure and at desired flow rates. Fluid drains from the control valves and from the gearbox back into sump 22 .
- controller 28 may shut the engine off during idle conditions to save fuel. With the engine off, mechanical pump 20 does not provide pressurized fluid. In order to respond quickly when the driver releases the brake pedal, it may be necessary to maintain clutches in an engaged state or a ready-to-engage state. Electric pump 30 provides pressurized fluid for this purpose. Electric pump 30 may also be used in other circumstances. For example, electric pump 30 may be used to supplement the flow rate of mechanical pump 20 during periods of high fluid demand, enabling use of a smaller mechanical pump with less parasitic drag.
- a single filter for both pumps 20 and 30 , such that all of the filter area is available when either pump is operating alone.
- use of a shared filter can introduce some issues. When the flow rate into one of the pumps is high, there may be a low pressure near the outlet servicing that pump. If the outlet servicing the other pump is located in that low-pressure area, it may be unable to draw sufficient fluid when the two pumps operate simultaneously. Also, effectively sealing a filter outlet to a pump inlet may require accurately relative positioning. To achieve this, the filter retention provisions may allow some position adjustment during assembly to accommodate piece to piece variation due to production tolerances. When a filter services multiple pumps, the relative position of the two pumps may vary due to piece to piece variation. Adjusting the position of the filter relative to one of the pumps may place the filter in an improper location relative to the other pump.
- FIG. 2 is a bottom view a transmission suction filter suitable for servicing multiple pumps.
- the filter includes a filter body 32 .
- An inlet opening 34 in the bottom of the body permits fluid to enter the body from the transmission sump 22 .
- a front outlet tube 36 extends forward to service mechanical pump 20 . As shown most clearly in FIG. 3 , front outlet tube 36 extends diagonally upward.
- the filter includes a rear extension 38 .
- a rear outlet 40 is formed in the top of the rear extension to service electric pump 30 .
- Two mounting holes 42 are formed in the rear extension.
- FIG. 3 is a cross sectional view of filter 24 and the two pumps 20 and 30 .
- Filtration media 44 is contained within filter body 32 such that fluid entering inlet 34 on the bottom flows through the media 44 before exiting through either front outlet tube 36 or rear outlet hole 40 .
- top surface 46 extends over the main body of the filter and over the rear extension 38 .
- the top surface of the rear extension may be slightly higher or slightly lower than the top surface of the main body.
- a compression seal 48 surrounds rear outlet hole 40 between top surface 46 and an inlet flange of electric pump 30 .
- An inlet tube 50 of mechanical pump 20 extends over front outlet tube 36 .
- a radial seal 52 prevents fluid from leaking from the fluid filter back to the sump between these components.
- FIG. 4 is a second cross sectional view of filter 24 showing a portion of electric pump 30 .
- the inlet flange of electric pump 30 extends over the two mounting holes 42 in the rear extension.
- Bolts 54 extend through mounting holes 42 into threaded holes in the electric pump flange. Tightening these bolts compresses compression seal 48 .
- the bolts position the rear end of the filter vertically, horizontally, and rotationally. The front end of the filter is supported by the inlet tube of the mechanical filter.
- FIG. 5 is a flowchart illustrating an assembly process for the transmission of FIG. 1 .
- mechanical pump 20 is install by fastening it to the transmission case.
- the electric pump is install by fastening it to the transmission case.
- a number of noise factors may cause variation in the relative locations of the inlet ports of the two pumps. In addition to dimensional tolerances of the parts themselves, the joints may involve some variability.
- the pumps are typically installed by installing screws or bolts through mounting holes into pre-drilled threaded holes in the case.
- the mounting holes typically have some clearance around the screws which simplify the assembly process but allow some location variation. Features that would more precisely locate the pumps relative to the case and to one another add cost and increase assembly time.
- the filter is positioned by sliding the front outlet tube 36 into mechanical pump inlet tube 50 until the rear outlet hole lines up with the electric pump inlet. Since the rear outlet hole may not be visible during this process, it may be desirable to use the mounting holes 42 and the threaded holes in the electric pump flange to determine alignment. If the two pumps are closer to one another than the nominal dimensions, then tube 36 slides further into tube 50 . If the pump inlets are father apart than the nominal dimensions, then tube 36 and tube 50 overlap less. The effectiveness of the radial seal is not sensitive to how far outlet tube 36 slides into inlet tube 50 (within a wide range). The radial seal is also effective in the presence of slight mis-alignment between the axes of tubes 36 and 50 .
- mounting holes 42 are installed through mounting holes 42 into the electric pump flange. As these bolts are tightened, seal 48 is compressed.
- the mounting holes are preferably on opposite sides of the rear outlet hole to ensure even compression and minimum sensitivity to mis-alignment between axes of the rear outlet hole and the electric pump inlet.
Abstract
A transmission filter includes two outlets. One outlet, adapted to feed an engine-driven pump, protrudes diagonally from the front of the filter. The first outlet is sealed to the inlet of the engine-driven pump by a radial seal. The second outlet is arranged in a rear extension and is sealed to the inlet of an electric pump by a compression seal. The differing types of seals and relative orientations of the outlets make the assembly less sensitive to dimension variation due to production and assembly tolerances. The relative locations of the outlets also mitigate any flow interactions between the pumps when both operate simultaneously.
Description
- This application is a division of U.S. application Ser. No. 15/813,203 filed Nov. 15, 2017, the disclosure of which is hereby incorporated in its entirety by reference herein.
- This disclosure relates to the field of transmission systems. More particularly, the disclosure pertains to a filter assembly.
- Automatic transmission fluid serves many functions in a modern automatic transmission. Pressurized fluid may be used to engage friction clutches in order to establish a power flow path with a desired speed ratio. Fluid lubricates gears and bearings. Excess heat is removed by fluid flowing over various components. When the fluid contain contaminants, it may be less effective in these functions and may cause failures such as stuck valves. Therefore, transmissions often include fluid filters.
- Filters may be placed on either the inlet (low pressure) side of a transmission pump or on the outlet (high pressure) side of a transmission pump. Transmission oil filters typically contain a filtration media. The media may be pleated to increase the surface area in a limited space.
- A transmission includes a filter, an engine driven pump, and an electric pump. The a filter has a bottom surface defining a filter inlet, a top surface defining a rear outlet hole, and a front outlet tube projecting from a front end at an oblique angle relative to the top surface. The filter may further include a rear extension projecting from a rear end in which case the rear outlet hole is defined in the top surface over the rear extension. The engine driven pump has an inlet sealed to the front outlet tube by a radial seal. The electric pump is sealed to the top surface around the rear outlet hole by a compression seal. The transmission may also include two bolts fastening the rear extension to the electric pump and compressing the compression seal.
- A filter assembly includes a main body, a rear extension, and a front outlet tube. The main body is adapted to fit into a transmission sump, contains filter media, and has a bottom surface defining an inlet. The rear extension extends from the main body and has a top surface defining a rear outlet hole. The rear extension may further define two mounting holes. The rear outlet hole may be between the two mounting holes. A compression seal may surround the rear outlet hole. The front outlet tube projects from a front of the main body at an oblique angle relative to the top surface. A radial seal may be arranged around the front outlet tube.
- A method of assembling a transmission includes installing an engine-driven pump and an electric pump, sealing a first outlet of a filter to an inlet of the engine-driven pump using a radial seal, positioning a second outlet of the filter adjacent to an inlet of the electric pump, and bolting the filter to the electric pump to compress a seal between the filter and the inlet of the electric pump. Positioning the second outlet of the filter adjacent to the inlet of the electric pump may include moving the filter parallel to an axis of an inlet tube of the engine-driven pump and diagonally with respect to an inlet of the electric pump. The engine driven pump and the electric pump may be fastened directly to a transmission case.
-
FIG. 1 is a schematic diagram of a vehicle transmission. -
FIG. 2 is a bottom view transmission suction filter. -
FIG. 3 is a side cross section of the filter ofFIG. 2 . -
FIG. 4 is a rear cross section of the filter ofFIG. 2 . -
FIG. 5 is a flow chart of a process of assembling the transmissionFIG. 1 using the filter ofFIGS. 2-4 . - Embodiments of the present disclosure are described herein. It is to be understood, however, that the disclosed embodiments are merely examples and other embodiments can take various and alternative forms. The figures are not necessarily to scale; some features could be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention. As those of ordinary skill in the art will understand, various features illustrated and described with reference to any one of the figures can be combined with features illustrated in one or more other figures to produce embodiments that are not explicitly illustrated or described. The combinations of features illustrated provide representative embodiments for typical applications. Various combinations and modifications of the features consistent with the teachings of this disclosure, however, could be desired for particular applications or implementations.
-
FIG. 1 schematically illustrates a transmission hydraulic system. Bold lines indicate mechanical power flow. Thin solid lines indicate flow of hydraulic fluid. Dashed lines indicate electrical signals.Transmission input shaft 10 is connected to the vehicle crankshaft. Power from the engine is delivered to torque converter 12 which drivesturbine shaft 14. Clutches within gearbox 16 are engaged to establish a power flow path fromturbine shaft 14 tooutput shaft 18. Different power flow paths having different speed ratios may be established by engaging different clutches. In a rear wheel drive transmission,output shaft 18 is connected to a driveshaft which transmits the power to a rear differential and then to rear wheels. In a four wheel drive vehicle, a transfer case may be installed between the output shaft and the driveshaft to divert a portion of the power to a front differential and then to front wheels. In a front wheel drive vehicle, the output shaft may transmit power to a front differential via gears or a chain. - Some engine power is diverted to drive
mechanical pump 20.Mechanical pump 20 draws fluid from sump 22, throughfilter 24, and delivers the fluid, at increased pressure, tovalve body 26. The pressure at which fluid enters the valve body may be called line pressure. Controller 28 commands a network of control valves within the valve body to deliver fluid to torque converter and gearbox components at desired pressures less than line pressure and at desired flow rates. Fluid drains from the control valves and from the gearbox back into sump 22. - In some vehicles, controller 28 may shut the engine off during idle conditions to save fuel. With the engine off,
mechanical pump 20 does not provide pressurized fluid. In order to respond quickly when the driver releases the brake pedal, it may be necessary to maintain clutches in an engaged state or a ready-to-engage state.Electric pump 30 provides pressurized fluid for this purpose.Electric pump 30 may also be used in other circumstances. For example,electric pump 30 may be used to supplement the flow rate ofmechanical pump 20 during periods of high fluid demand, enabling use of a smaller mechanical pump with less parasitic drag. - It is preferable to use a single filter for both
pumps -
FIG. 2 is a bottom view a transmission suction filter suitable for servicing multiple pumps. The filter includes afilter body 32. An inlet opening 34 in the bottom of the body permits fluid to enter the body from the transmission sump 22. Afront outlet tube 36 extends forward to servicemechanical pump 20. As shown most clearly inFIG. 3 ,front outlet tube 36 extends diagonally upward. The filter includes arear extension 38. Arear outlet 40 is formed in the top of the rear extension to serviceelectric pump 30. Two mountingholes 42 are formed in the rear extension. -
FIG. 3 is a cross sectional view offilter 24 and the twopumps Filtration media 44 is contained withinfilter body 32 such thatfluid entering inlet 34 on the bottom flows through themedia 44 before exiting through eitherfront outlet tube 36 orrear outlet hole 40. In the illustrated embodiment,top surface 46 extends over the main body of the filter and over therear extension 38. In some embodiments, the top surface of the rear extension may be slightly higher or slightly lower than the top surface of the main body. Acompression seal 48 surroundsrear outlet hole 40 betweentop surface 46 and an inlet flange ofelectric pump 30. Aninlet tube 50 ofmechanical pump 20 extends overfront outlet tube 36. Aradial seal 52 prevents fluid from leaking from the fluid filter back to the sump between these components. - Placing the outlets at opposite ends of the filter assures minimal pressure interaction between the pumps. In other words, when both pumps operate simultaneously, one does not create a low pressure region in the vicinity of the other pumps inlet. When only one pump operates, the full area of the filter media is available, thus minimizing parasitic pressure loss.
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FIG. 4 is a second cross sectional view offilter 24 showing a portion ofelectric pump 30. The inlet flange ofelectric pump 30 extends over the two mountingholes 42 in the rear extension.Bolts 54 extend through mountingholes 42 into threaded holes in the electric pump flange. Tightening these bolts compressescompression seal 48. Also, the bolts position the rear end of the filter vertically, horizontally, and rotationally. The front end of the filter is supported by the inlet tube of the mechanical filter. -
FIG. 5 is a flowchart illustrating an assembly process for the transmission ofFIG. 1 . At 60,mechanical pump 20 is install by fastening it to the transmission case. At 62, the electric pump is install by fastening it to the transmission case. A number of noise factors may cause variation in the relative locations of the inlet ports of the two pumps. In addition to dimensional tolerances of the parts themselves, the joints may involve some variability. The pumps are typically installed by installing screws or bolts through mounting holes into pre-drilled threaded holes in the case. The mounting holes typically have some clearance around the screws which simplify the assembly process but allow some location variation. Features that would more precisely locate the pumps relative to the case and to one another add cost and increase assembly time. - At 64, the filter is positioned by sliding the
front outlet tube 36 into mechanicalpump inlet tube 50 until the rear outlet hole lines up with the electric pump inlet. Since the rear outlet hole may not be visible during this process, it may be desirable to use the mountingholes 42 and the threaded holes in the electric pump flange to determine alignment. If the two pumps are closer to one another than the nominal dimensions, thentube 36 slides further intotube 50. If the pump inlets are father apart than the nominal dimensions, thentube 36 andtube 50 overlap less. The effectiveness of the radial seal is not sensitive to howfar outlet tube 36 slides into inlet tube 50 (within a wide range). The radial seal is also effective in the presence of slight mis-alignment between the axes oftubes - At 66, two bolts are installed through mounting
holes 42 into the electric pump flange. As these bolts are tightened,seal 48 is compressed. The mounting holes are preferably on opposite sides of the rear outlet hole to ensure even compression and minimum sensitivity to mis-alignment between axes of the rear outlet hole and the electric pump inlet. - While exemplary embodiments are described above, it is not intended that these embodiments describe all possible forms encompassed by the claims. The words used in the specification are words of description rather than limitation, and it is understood that various changes can be made without departing from the spirit and scope of the disclosure. As previously described, the features of various embodiments can be combined to form further embodiments of the invention that may not be explicitly described or illustrated. While various embodiments could have been described as providing advantages or being preferred over other embodiments or prior art implementations with respect to one or more desired characteristics, those of ordinary skill in the art recognize that one or more features or characteristics can be compromised to achieve desired overall system attributes, which depend on the specific application and implementation. As such, embodiments described as less desirable than other embodiments or prior art implementations with respect to one or more characteristics are not outside the scope of the disclosure and can be desirable for particular applications.
Claims (14)
1. A filter assembly comprising:
a main body adapted to fit into a transmission sump, containing filter media, and having a bottom surface defining an inlet;
a rear extension extending from the main body and having a top surface defining a rear outlet hole; and
a front outlet tube projecting from a front of the main body and configured to slide into a pump inlet tube at an angle that is not perpendicular to a plane of the rear outlet hole.
2. The filter assembly of claim 1 wherein the rear extension further defines two mounting holes.
3. The filter assembly of claim 2 wherein a center of the rear outlet hole is between centers of the two mounting holes.
4. The filter assembly of claim 1 further comprising a compression seal surrounding the rear outlet hole.
5. The filter assembly of claim 1 further comprising a radial seal around the front outlet tube.
6. A method of assembling a transmission comprising:
installing first and second pumps each having first and second inlets respectively;
sealing a first outlet of a filter to the first inlet using a radial seal;
positioning a second outlet of the filter adjacent to the second inlet; and
bolting the filter to the second pump to compress a seal between the filter and the second inlet.
7. The method of claim 6 wherein positioning the second outlet of the filter adjacent to the second inlet comprises moving the filter parallel to an axis of an inlet tube of the first pump and diagonally with respect to an inlet of the second pump.
8. The method of claim 6 wherein installing the first pump comprises fastening the first pump directly to a transmission case.
9. The method of claim 8 wherein installing the second pump comprises fastening the second pump directly to the transmission case.
10. The method of claim 6 wherein the first pump is an engine driven pump.
11. The method of claim 10 wherein the second pump is an electric pump.
12. A transmission comprising:
a filter having a bottom surface defining a filter inlet, a top surface defining a rear outlet hole, and a front outlet tube projecting from a front end at an oblique angle relative to the top surface;
a first pump having a first inlet sealed to the front outlet tube by a radial seal; and
a second pump having a second inlet sealed to the top surface around the rear outlet hole by a compression seal wherein the first inlet is not parallel to the second inlet.
13. The transmission of claim 12 wherein the first pump is an engine driven pump.
14. The transmission of claim 12 wherein the second pump is an electric pump.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US18/321,138 US20230294025A1 (en) | 2017-11-15 | 2023-05-22 | Transmission oil filter assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US15/813,203 US11691097B2 (en) | 2017-11-15 | 2017-11-15 | Transmission oil filter assembly |
US18/321,138 US20230294025A1 (en) | 2017-11-15 | 2023-05-22 | Transmission oil filter assembly |
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US15/813,203 Division US11691097B2 (en) | 2017-11-15 | 2017-11-15 | Transmission oil filter assembly |
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US20230294025A1 true US20230294025A1 (en) | 2023-09-21 |
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US15/813,203 Active 2042-05-05 US11691097B2 (en) | 2017-11-15 | 2017-11-15 | Transmission oil filter assembly |
US18/321,138 Pending US20230294025A1 (en) | 2017-11-15 | 2023-05-22 | Transmission oil filter assembly |
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US15/813,203 Active 2042-05-05 US11691097B2 (en) | 2017-11-15 | 2017-11-15 | Transmission oil filter assembly |
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Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7282140B2 (en) | 2001-03-02 | 2007-10-16 | Filtertek Inc. | Sump filter with filter element cartridge |
US6582593B2 (en) * | 2001-05-30 | 2003-06-24 | Spx Corporation | Transmission sump filter with bypass valve |
US7998347B2 (en) | 2008-05-29 | 2011-08-16 | Ford Global Technologies, Llc | Suction filter for automatic transmission fluid |
DE102009054754B4 (en) * | 2009-12-16 | 2019-02-07 | Zf Friedrichshafen Ag | Method for operating an electric auxiliary pump, device for carrying out such a method, and hydraulic system with such a device. |
DE102010029830B4 (en) | 2010-06-09 | 2023-06-15 | Zf Friedrichshafen Ag | Suction oil filter with a bypass and control of the bypass |
DE102011076760A1 (en) * | 2011-05-31 | 2012-12-06 | Zf Friedrichshafen Ag | Oil filter of a transmission for motor vehicles |
US10494962B2 (en) * | 2012-09-18 | 2019-12-03 | Daikyonishikawa Corporation | Oil strainer |
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2017
- 2017-11-15 US US15/813,203 patent/US11691097B2/en active Active
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2023
- 2023-05-22 US US18/321,138 patent/US20230294025A1/en active Pending
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US11691097B2 (en) | 2023-07-04 |
US20190143252A1 (en) | 2019-05-16 |
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