Heat exchange – With timer – programmer – time delay – or condition responsive... – Fluid pressure responsive or control
Patent
1996-11-12
1999-11-30
Lazarus, Ira S.
Heat exchange
With timer, programmer, time delay, or condition responsive...
Fluid pressure responsive or control
165283, 165916, 137539, 1375991, 184 622, 1841041, 1841043, G05D 1500, F16K 1500, F01M 500, E03B 6520
Patent
active
059925159
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a transmission fluid cooling system and more particularly to a cooler-bypass unit having a banjo bolt incorporating a relief valve.
Vehicles are typically equipped with transmissions that provide different speed ratios between the engine and the drive axles. A transmission typically generates a good deal of heat, and thus oil is circulated to cool the transmission components.
The oil in the transmission becomes quite hot during operation of the vehicle. Thus, the oil is typically routed to a cooling unit. The cooling unit cools the oil which is then returned to the transmission.
Typically, the transmission is spaced some distance from the cooling unit. As such, fluid lines, such as conduits or hoses must travel the distance from the transmission to the cooling unit. The oil travels between the transmission and cooling unit through the fluid lines.
When the engine is running, oil is continuously being moved to the cooling unit, and from the cooling unit back to the transmission. When the vehicle is cool, the oil is relatively viscous and does not flow quickly through the cooling unit. This causes back pressure on the supply line leading to the cooling unit. For this reason, some transmission cooling units have incorporated a relief valve for returning a portion of the transmission fluid from the supply line leading to the cooling unit directly back into the return line leading back to the transmission. In the past, the relief valve is installed between a T-connector in the supply line and a T-connector in the return line. The separate components result in an unduly high amount of fluid connections, and also additional parts which require additional assembly time.
The more fluid connections that are created in a transmission cooling system, the more places there are that could potentially leak. A transmission oil leak could be very damaging to the vehicle, and could lead to seizure of the transmission. Thus, the relatively high number of fluid connections is undesirable.
SUMMARY OF THE INVENTION
The present invention provides a transmission cooler-bypass unit for connection between the fluid supply line and fluid return line. The cooler-bypass unit includes a banjo bolt relief valve having a head portion and a body portion. A banjo bolt is a known type of fluid connection, but this invention incorporates a valve in the banjo bolt. The head portion is generally in the shape of a short cylinder having an inner annular cavity. The body portion is generally an elongated cylinder extending transversely from the head portion. A relief port provides fluid communication between the head portion and body portion. A bypass relief valve is incorporated within the body portion of the banjo bolt relief valve to regulate the flow between the head portion and the body portion. A valve seat is formed at the relief port between the head portion and the body portion. A ball is biased against the valve seat by a spring. Since the relief valve is incorporated into the banjo bolt, which is used to connect a fluid line to the transmission, fewer fluid connections are necessary.
An externally threaded hollow bolt is inserted through the head portion and threaded into the transmission case. The hollow bolt includes an axial bore and a transverse port in connection with the axial bore. The transverse port is aligned within the annular cavity and provides a connection between the axial bore and annular cavity. The hollow bolt provides means for connecting the fluid supply line to the head portion of the banjo bolt relief valve.
The body portion of the banjo bolt relief valve is in fluid communication with the transmission fluid return line. A return banjo bolt having a head portion and body portion can be used to provide connection of the banjo bolt relief valve body portion to the transmission fluid return line. The head portion of the return banjo bolt is connected to the fluid return line by a hollow bolt having an axial bore and a transverse port. If necessary, a bypass fl
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Form Rite
Lazarus Ira S.
Pryor Matthew G.
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