Transmission with sump oil level responsive controls
First Claim
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1. In a transmission:
- a housing having a sump with a normal fluid level range and an abnormal fluid level beyond said normal fluid level range;
a multiratio gear unit having drive means for establishing low and high ratio drives mounted in said housing;
a mainline;
a fluid pressure source having a suction inlet in said sump and applying substantially proper regulated pressure when the fluid level in said sump is in said normal fluid level range and at said abnormal fluid level to said mainline for proper positive transmission operation;
shift control means for selectively controlling said drive means to selectively establish said low and high ratio drives;
level sensor means mounted in said housing providing an abnormal fluid level signal in response to the fluid level in said sump being at said abnormal fluid level beyond said normal fluid level range; and
shift inhibiting means connected to said level sensor means and said shift control means operative in response to said abnormal fluid level signal to change said shift control means operation to provide abnormal operation in one operating phase and provide normal proper positive transmission operation in another operating phase.
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Abstract
A multiratio powershift transmission having automatic speed and torque demand responsive shift controls providing a normal shift program when the sump oil level is in the normal operating range. When the sump oil level is in an abnormal operating range, either lower or higher than the normal operating range, a sump oil level responsive control acts on the shift controls to provide an abnormal shift program preventing drive in the highest gear ratio and providing normal operation in the other gear ratio.
25 Citations
9 Claims
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1. In a transmission:
- a housing having a sump with a normal fluid level range and an abnormal fluid level beyond said normal fluid level range;
a multiratio gear unit having drive means for establishing low and high ratio drives mounted in said housing;
a mainline;
a fluid pressure source having a suction inlet in said sump and applying substantially proper regulated pressure when the fluid level in said sump is in said normal fluid level range and at said abnormal fluid level to said mainline for proper positive transmission operation;
shift control means for selectively controlling said drive means to selectively establish said low and high ratio drives;
level sensor means mounted in said housing providing an abnormal fluid level signal in response to the fluid level in said sump being at said abnormal fluid level beyond said normal fluid level range; and
shift inhibiting means connected to said level sensor means and said shift control means operative in response to said abnormal fluid level signal to change said shift control means operation to provide abnormal operation in one operating phase and provide normal proper positive transmission operation in another operating phase.
- a housing having a sump with a normal fluid level range and an abnormal fluid level beyond said normal fluid level range;
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2. In a transmission:
- a housing having a sump with a normal fluid level range and an abnormal fluid level beyond said normal fluid level range;
a multiratio gear unit having fluid operated means for establishing low and high ratio drives mounted in said housing;
a mainline;
a fluid pressure source having a suction inlet in said sump and supplying substantially proper regulated pressure when the fluid level in said sump is in said normal fluid level range and at said abnormal fluid level to said mainline for proper positive transmission operation;
shift control means connected to said mainline and said fluid operated means for selectively controlling the connection of said mainline to said fluid operated means to selectively establish said low and high ratio drives;
level sensor means mounted in said housing providing an abnormal fluid level signal in response to the fluid level in said sump being at said abnormal fluid level beyond said normal fluid level range; and
shift inhibiting means connected to said level sensor means and said shift control means operative in response to said abnormal fluid level signal to inhibit said shift control means operation to provide abnormal operation preventing a shift to one of said ratio drives and provide normal proper positive transmission operation in another of said ratio drives.
- a housing having a sump with a normal fluid level range and an abnormal fluid level beyond said normal fluid level range;
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3. In a transmission:
- a housing having a sump with a normal fluid level range and an abnormal fluid level beyond said normal fluid level;
a multiratio gear unit having fluid operated means for establishing low and high ratio drives mounted in said housing;
a mainline;
a fluid pressure source having a suction inlet in said sump and supplying substantially proper regulated pressure when the fluid level in said sump is in said normal fluid level range and at said abnormal fluid level to said mainline for proper positive transmission operation;
shift control means connected to said mainline and said fluid operated means for selectively connecting said mainline to said fluid operated means to selectively establish said low and high ratio drives;
level sensor means mounted in said sump providing an abnormal fluid level signal in response to the fluid level in said sump being at an abnormal fluid level; and
shift inhibiting means connected to said level sensor means and said shift control means and operative in response to said abnormal fluid level signal to inhibit said shift control means operation to prevent a shift from said low ratio drive to said high ratio drive and provide proper positive transmission operation in said low ratio drive.
- a housing having a sump with a normal fluid level range and an abnormal fluid level beyond said normal fluid level;
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4. In a transmission:
- a housing having a sump with a normal fluid level range and an abnormal low fluid level below said normal fluid level;
a multiratio gear unit having fluid operated means for establishing low and high ratio drives mounted in said housing;
a mainline;
a fluid pressure source having a suction inlet in said sump and supplying substantially proper regulated pressure when the fluid level in said sump is in said normal fluid level range and at said abnormal fluid level to said mainline for proper positive transmission operation;
shift control means connected to said mainline and said fluid operated means selectively connecting said mainline to said fluid operated means to selectively establish said low and high ratio drives;
fluidic jet level sensor means mounted in said sump and having a receiving port, a jet nozzle having an outlet substantially at said abnormal low fluid level and facing said receiving port across a gap and connected to said mainline and providing a fluid jet stream from said outlet face across said gap to provide a low fluid level signal in response to the fluid level in said sump being substantially at said abnormal low fluid level; and
to discontinue said fluid jet stream and said low fluid level signal in response to the fluid level in said sump being in said normal fluid level range; and
shift inhibiting means connected to said fluidic jet level sensor means and said shift control means and operative in response to said low fluid level signal to inhibit said shift control means operation to prevent a shift from said low ratio drive to said high ratio drive and provide proper positive operation in said low ratio drive. - View Dependent Claims (5, 6, 7, 8)
- a housing having a sump with a normal fluid level range and an abnormal low fluid level below said normal fluid level;
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9. In a transmission:
- a housing having a sump with a normal fluid level range, an abnormal high fluid level above and an abnormal low fluid level below said normal fluid level range;
a multiratio gear unit having a rotary gearing mounted in said housing above said normal fluid level range and contacting fluid at said abnormal high fluid level and aerating the fluid in said sump, and having the fluid operated means for establishing low and high ratio drives;
a mainline;
a fluid pressure source having pump means, a suction inlet in said sump ending at said abnormal low fluid level below said normal fluid level range and supplying substantially proper regulated pressure when the fluid level in said sump is in said normal fluid level range and at said abnormal fluid level, which is aerated when said sump fluid level is at or below said low fluid level and at said high fluid level and is nonaerated when said sump fluid level is in said normal fluid level range, to said mainline for proper positive transmission operation;
shift control means connected to said mainline and said fluid operated means selectively connecting said mainline to said fluid operated means to selectively establish said low and high ratio drives;
level sensor means mounted in said sump providing an abnormal fluid level signal in response to aeration of fluid in said sump; and
shift inhibiting means connected to said level sensor means and said shift control means operative in response to said abnormal fluid level signal to inhibit said shift control means operation to prevent a shift from said low ratio drive to said high ratio drive and provide proper positive operation in said low ratio drive.
- a housing having a sump with a normal fluid level range, an abnormal high fluid level above and an abnormal low fluid level below said normal fluid level range;
Specification