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1. reverse movement of the automobile In effecting movement of the various shift valves to properly route the oil to appropriate clutch plates the controlled hydraulic transmission oil pressure is used as described This pressure is made responsive to the shaft speed as well as the shaft torque The drive shaft speed is measured by a governor and this information is re layed to the valve body in the form of more or less hydraulic pressure by opening a specific valve a precise amount Thus with the manual shift lever in the drive or D position the automobile can be started from a rest posi tion the various gears automatically shifting from low through intermediate positions to high While such shifting is completely automatic the driver does have some control in that the manual shift lever usually in cludes 1 and 2 positions constituting low gear ratios as might be used when climbing a steep grade or as a brak ing feature when descending a steep grade As men tioned however once the manual gear shift lever is set in one of its various positions automatic shifting occurs within the given shift range of that position There are many instances however when a driver may wish to effect all shifting manually rather than have the shifting take place automatically In the case of manual shifting the driver would always start the vehi cle in the number 1 or number 2 gear shift lever position and progress up to the drive or D po2. vided to effect automatic sequential shifting with changes in the pressure of the transmission oil As a consequence the gears in the transmission can only be shifted manually once the channel plate is in position BRIEF DESCRIPTION OF THE DRAWINGS A better understanding of this invention will be had by referring to the accompanying drawings in which FIG 1 is a perspective cut away view of a typical automatic transmission system for an automobile cer tain parts being depicted purely schematically for ease in explanation FIG 2 is an enlarged exploded fragmentary perspec tive view of a portion of the valve body of the transmis sion system of FIG 1 looking generally in the direction of the arrow 2 and FIG 3 is an end elevation of the assembled compo nents shown in FIG 2 wherein phantom lines are pro vided to depict the desired result DETAILED DESCRIPTION OF THE INVENTION Referring first to FIG 1 the automatic transmission is designated generally by the numeral 10 having an input shaft 11 from the automobile engine coupled by means of various planetary and sun type gears 12 pro vided with appropriate clutch plates and bands sche matically indicated at 13 to an output shaft 14 connect ing to the driving wheels of the vehicle As described heretofore the ratio of the input to output shaft speeds for the shafts 11 and 14 is controlled by the various gears within the transmission body 10 by means of the clutch plates a
3. FOR AUTOMATIC TRANSMISSIONS This invention relates generally to automatic trans missions for automobile engines and more particularly to a channel plate structure to convert the automatic shifting to manual shifting BACKGROUND OF THE INVENTION Most automatic transmissions for shifting gears in automobile engines comprise various sun and planetary gears with appropriate clutch plates and bands respon sive to hydraulic oil pressure to hold one or more gears and thus change the effective ratio between input shaft speed from the engine and output shaft speed to the wheels The heart of such transmission systems is a valve body containing various inter related passages valves springs and orifices The valve body receives signals in the form of hydraulic pressures which func tion to shift various ones of the shift valves to thereby route the transmission oil to appropriate clutch plates or bands and thus automatically effect sequential shifting within a given range Mechanical shifting is effected by mechanical movement of other valves to change from a given shift range to another given shift range this shift ing normally being accomplished by the shift lever For most normal driving there is only one position for the manual shift lever which is the drive or D posi tion Once the lever is placed in this position the shift ing of the gears is completely automatic The same shift lever also serves to shift certain other valves to effect
4. United States Patent i9 Younger 11 4 210 034 45 Jul 1 1980 54 CHANNEL PLATE FOR AUTOMATIC TRANSMISSIONS 76 Inventor Gilbert W Younger 2621 Merced Ave El Monte Calif 91733 21 Appl No 824 331 22 Filed Aug 15 1977 51 Tint CAR oneasieesserenesensenenesenesennnsennnennneenn F16H 57 02 52 US CA nsseneseesseenennne 74 606 R 60 458 137 884 58 Field of Search 74 606 R 137 884 60 458 56 References Cited U S PATENT DOCUMENTS 3 495 604 2 1970 Trask ccccsssssssssssssssssssessesseeese 137 884 3 530 884 9 1970 Kutz aaneen 137 884 3 548 849 12 1970 Purcell 137 884 3 840 047 10 1974 Gibbins 137 884 OTHER PUBLICATIONS Chrysler Chassis Service Manual 1972 Torqueflight Transmission Section 21 Figures 53 58 Chrysler Chassis Body Manual 1978 Torqueflight Transmission pp 21 74 to 21 77 Primary Examiner Samuel Scott Assistant Examiner Wesley S Ratliff Jr Attorney Agent or Firm Ralph B Pastoriza 57 ABSTRACT A channel plate is provided for blocking transmission oil flow between two shift valves normally provided to effect automatic sequential shifting with changes in the pressure of the transmission oil By inserting the chan nel plate the gears in the transmission can only be shifted manually 2 Claims 3 Drawing Figures 4 210 034 Jul 1 1980 U S Patent FIG 1 1 CHANNEL PLATE
5. bles automatic shifting to be converted to manual shifting in an automatic transmission system without the necessity of disassemblying the entire trans mission I claim 1 In an automatic transmission for shifting gears a channel plate for blocking transmission oil flow be tween two shift valves normally provided to effect automatic sequential shifting with changes in the pres sure of said transmission oil so that the gears in said transmission can only be shifted manually said two shift valves being receivable in side by side valve bores in the valve body for said automatic transmission said bores normally being covered by a valve cover having an internal passage placing said bores in communication with each other and with the transmission oii said chan nel plate comprising a thin metal member insertable between said valve cover and entrances to said bores to eclipse said passage so that oil flow through said pas sage is blocked said metal member further including a side notch placing one of said bores in communication with the exterior of said valve body and an elongated opening placing the other of said bores in communica tion with said transmission oil 2 In an automatic transmission for shifting gears in an automobile engine wherein there are provided first and second bores in the valve body of said transmission for receiving first and second shift valves and wherein a valve cover plate having a passage therein is dimen sione
6. d to overlie said bores with said passage placing said bores in communication with each other so that transmission oil pressure controlled by the transmission governor is applied from an opening adjacent to said second bore to both valves to effect a desired sequential shifting a channel plate for insertion between said valve cover plate and said bores a said channel plate being dimensioned to seal off said passage from said bores to block communica tion between said bores and further including b a side notch registering with said first bore to exhaust oil therefrom and c an elongated opening having one end positioned to register with said second bore and its other end to register with said transmission oil opening so that the first bore is exhausted and the second bore subject to governed transmission oil pressure thereby preventing automatic sequential shifting so that the transmission gears can only be shifted man ually i es k k k k
7. ncreased To remove the automatic shifting feature so that the gears can be shifted only manually in accord with the present invention there is provided a channel plate 28 for insertion between the valve cover plate 26 and en trances to the bores 21 and 22 to eclipse the passage 27 in the cover plate so that the oil flow through the pas sage is blocked Under these conditions automatic shift ing of the valves with increasing hydraulic transmission oil pressure is prevented As is evident from FIG 2 the channel plate 28 is in the form of a thin metal member which can be readily inserted simply by removing the cover plate 26 and sandwiching the channel plate 28 in position It will be noted that the channel plate 28 in addition to sealing off the passage 27 from the bores further includes a side notch 29 arranged to register with the first bore 21 to exhaust oil therefrom to the exterior that is to the oil sump or oil pan 18 of FIG 1 Also provided is an elongated opening 30 having one end positioned to register with the second bore 22 and its other end to register with the transmission oil inlet opening 25 so that the second bore is subject to gov erned transmission oil pressure Referring to FIG 3 the relative positions of the passage 27 bores 21 and 22 notch 29 and elongated opening 30 of the channel plate are depicted by phan tom lines after the components have been assembled Thus it will be noted that with the channel pla
8. nd clutch bands which when actuated will clutch certain gears to prevent their rotation thereby effecting the desired change in speed ratio The operation of the clutch plates and clutch bands is ef fected by hydraulic oil pressure routed to the appropri ate plates and bands in accordance with the shaft speed and torque Thus there is provided from appropriate transmis sion oil pump 15 transmission oil having a varying hy draulic pressure depending upon the shaft speed torque etc This transmission oil as indicated schematically by the solid line 16 is passed to the transmission valve body 17 constituting the heart of the transmission system The valve body 17 includes various inter related passages shift valves springs and the like for routing the oil in the oil sump or pan 18 constituting an oil reservoir to the 4 210 034 various clutch plates and bands the passage of the oil from the valve body again being schematically depicted by the solid lines 19 In accord with the present invention to convert auto matic shifting to manual shifting requires modification of only a certain portion of the valve body 17 as op posed to having to disassemble the entire transmission to effect such modification This portion of the valve body 17 to be modified includes first and second shift valves involved in the automatic shifting from low to high and its location is designated generally by the arrow 20 in FIG 1 Refer
9. ring to FIG 2 details of the valve body 17 as shown by the arrow 20 will be described Thus the normal valve body 17 includes in its side first and sec ond bores 21 and 22 for receiving first and second shift valves portions of which are shown at 23 and 24 within the bores It will be understood that there are springs associated with these valves such that the degree of hydraulic pressure exerted thereon to effect a move ment or shifting can be appropriately adjusted In addi tion the diameter of the bores themselves receiving the shift valves are appropriately adjusted to adjust the area of the valve exposed to hydraulic pressure applied to the bores which again will determine the amount of hydraulic pressure necessary to move any specific shift valve The bores 21 and 22 with their corresponding shift valves 23 and 24 are normally both provided with trans mission oil pressure controlled by the transmission gov ernor as by way of a small port 25 and a valve cover plate 26 with a passage 27 therein placing the bores 21 and 22 into communication with the port 25 Thus for automatic shifting the cover plate 26 when placed di rectly over the bores 21 and 22 will result in the trans mission oil being applied to both of the shift valves 23 and 24 by way of the passage 27 Because of the differ ence in the bore diameters and the spring loading of the valves sequential shifting of the valves will occur as the transmission oil pressure is i
10. sition In the D position the gears would always be in high and would not automatically shift down or up with varying shaft speed and or torque Such manual shifting pro vides the driver with a maximum degree of control over the gears Such might be desirable in certain racing car operations or in certain driving situations wherein it might be desirable to have the car remain in low regardless of its speed or torque requirements 4 210 034 10 20 25 30 35 45 50 55 65 2 To eliminate the automatic shifting of a transmission so that the above referred to manual shifting can be effected normally would require a disassembly of the entire transmission system Such a conversion operation is not only expensive and time consuming but in the event it is desired to convert the system back into auto matic transmission shifting control the same disassem bly operation would be required BRIEF DESCRIPTION OF THE PRESENT INVENTION With the foregoing considerations in mind the pres ent invention contemplates a simple and uniquely di mensioned channel plate arranged to be inserted be tween a normally provided valve cover and the en trance to bores containing shift levers normally pro vided in the valve body of the automatic transmission system Essentially the channel plate blocks transmis sion oil flow between the two shift valves in the adja cent bores which transmission oil flow is normally pro
11. te 28 in position the passage 27 in the valve cover 26 is sealed off from communication with the first bore 21 the oil in this bore being exposed or exhausted to the exterior by means of the side notch 29 The elongated opening 30 in 20 25 30 45 50 55 6 65 4 the channel plate itself in turn places the second bore 22 into communication with the transmission oil port 25 This transmission oil pressure is received also in the passage 27 by way of the elongated opening 30 but since the other end of the passage 27 is completely eclipsed or sealed by the channel plate there will be no communi cation of this transmission oil with the first bore 21 Since the first shift valve 23 in the first bore 21 is no longer subject to the governed transmission oil pressure if the manual shift lever is placed in its low position the transmission gears will always be in low regard less of the speed or torque of the transmission shaft Shifting to a higher gear can then only be accomplished by manual shifting of the shift lever Should it be desired to reconvert the transmission system back to automatic shifting it is a simple matter simply to remove the channel plate 28 and remount the valve cover 26 so that the bores 21 and 22 are again then placed in communication by way of the passage 27 From the foregoing description it will thus be evi dent that the present invention in the form of the chan nel plate 28 ena
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