Anti-creep brake controlled by throttle and vehicle speed

Claim 2

In a motor vehicle including a transmission housing containing a source of fluid and having a transmission output shaft rotatably mounted therein, a governor for controlling the pressure of said transmission fluid in responSe to the speed of said motor vehicle, and a carburetor including a throttle plate, a brake-engaging system comprising a first plurality of brake discs secured to said transmission housing, a second plurality of brake discs secured to said transmission output shaft for rotation therewith, first means operatively connected to said two pluralities of brake discs for causing the engagement of said brake discs, a passage communicating between said source of transmission fluid and said first means, and second means operatively connected to said throttle plate and to said governor for controlling the flow of said transmission fluid through said passage to said first means in response to substantially zero throttle setting and a low vehicular speed for causing said first means to engage said brake discs, said second means including a regulating valve for regulating the pressure of said fluid flowing to said first means wherein the force of a low governor pressure on an end area of said regulating valve is replaced by the force of a higher pressure from the upstream portion of said passage on a differential area of said regulating valve for regulating the pressure in the downstream portion of said passage during the brake disc engagement process.

Claim 3

A brake-engaging system for a motor vehicle including a transmission housing containing a source of fluid and having a transmission output shaft rotatably mounted therein, and a carburetor including a throttle plate, said system comprising a first plurality of brake discs secured to said transmission housing, a second plurality of brake discs secured to said transmission output shaft for rotation therewith, a diaphragm movably mounted in said transmission housing, an anchor pin secured to one side of said diaphragm and extending axially therefrom, an annular lever mounted around said transmission output shaft and pivotably connected to the extended end portion of said anchor pin adjacent said two pluralities of brake discs for causing the engagement of said brake discs, a passage communicating between said source of transmission fluid and the other side of said diaphragm, a governor for controlling the pressure of said transmission fluid in response to the speed of said motor vehicle, said electromechanical means operatively connected to said throttle plate and to said governor for controlling the flow of said transmission fluid through said passage to said diaphragm in response to a substantially zero throttle setting and a low vehicular speed for causing said diaphragm to move said anchor pin, thereby pivoting said annular lever into contact with said brake discs.

Claim 4

A brake-engaging system for a motor vehicle including a transmission housing containing a source of fluid and having a transmission output shaft rotatably mounted therein, and a carburetor including a throttle plate, said system comprising a first plurality of brake discs secured to said transmission housing, a second plurality of brake discs secured to said transmission output shaft for rotation therewith, a diaphragm movably mounted in said transmission housing, an anchor pin secured to one side of said diaphragm and extending axially therefrom, an annular lever mounted around said transmission output shaft and pivotably connected to the extended end portion of said anchor pin adjacent said two pluralities of brake discs for causing the engagement of said brake discs, a passage communicating between said source of transmission fluid and the other side of said diaphragm, a governor for controlling the pressure of said transmission fluid in response to the speed of said motor vehicle, said electromechanical means operatively connected to said throttle plate and to said governor for controlling the flow of said transmission fluid through said passage to said diaphragm in response to a substantially zero throttle setting and a low vehicular speed for causing said diaphragm to move said anchor pin, thereby pivoting said annular lever into contact with said brake discs.

Claim 5

A brake-engaging system for a motor vehicle including a transmission housing containing a source of fluid and having a transmission output shaft rotatably mounted therein, and a carburetor including a throttle plate, said system comprising an electrical switch operatively connected to said throttle plate, a first plurality of brake discs fixedly secured to said transmission housing, a second plurality of brake discs fixedly secured to said transmission output shaft, a servomechanism slidably mounted in said transmission housing, lever means pivotably connected to said servomechanism adjacent said two pluralities of brake discs for causing the engagement of said brake discs, a passage communicating between said source of transmission fluid and said servomechanism, a solenoid operatively connected to said switch, valve means operatively connected to said solenoid and to said passage for controlling the flow of said transmission fluid through said passage in response to energization of said solenoid by said switch, a governor for controlling the pressure of said transmission fluid in response to the speed of said motor vehicle, and a regulating valve operatively connected to said governor for regulating the flow of said transmission fluid between said first-mentioned valve means and said servomechanism when said governor pressure signal is indicative of a low vehicular Speed and thereby causing said servomechanism to pivot said lever means into contact with said brake discs for engaging same.

Claim 6

A brake-engaging system for a motor vehicle including a transmission housing containing a source of fluid and having a transmission output shaft rotatably mounted therein, and a carburetor including a throttle plate, said system comprising an electrical switch operatively connected to said throttle plate, a first plurality of brake discs fixedly secured to said transmission housing, a second plurality of brake discs fixedly secured to said transmission output shaft, a servomechanism slidably mounted in said transmission housing, lever means pivotably connected to said servomechanism adjacent said two pluralities of brake discs for causing the engagement of said brake discs, a passage communicating between said source of transmission fluid and said servomechanism, a solenoid operatively connected to said switch, valve means operatively connected to said solenoid and to said passage for controlling the flow of said transmission fluid through said passage in response to energization of said solenoid by said switch, a governor for controlling the pressure of said transmission fluid in response to the speed of said motor vehicle, and a regulating valve operatively connected to said governor for regulating the flow of said transmission fluid between said first-mentioned valve means and said servomechanism when said governor pressure signal is indicative of a low vehicular Speed and thereby causing said servomechanism to pivot said lever means into contact with said brake discs for engaging same.

Claim 7

A brake system for a motor vehicle including a transmission housing having a transmission output shaft rotatably mounted therein, said system comprising a source of fluid under pressure, a first plurality of brake discs secured to said housing, a second plurality of brake discs secured to said transmission output shaft for rotation therewith, a second shaft rotatably mounted through an opening formed in the side of said housing transverse to said output shaft, means operatively connected to said second shaft for engaging said first and second pluralities of brake discs in response to rotary movement of said second shaft, a manual brake lever secured to said second shaft exterior of said housing for rotating said second shaft, normally closed valve means operatively connected to said second shaft, means operatively connected to said second shaft and to said valve means for opening said valve means when said second plurality of brake discs is moved axially into engagement with said first plurality of brake discs in response to manual actuation of said brake lever for supplying said fluid from said source to said discs as a coolant therefor, and a carburetor including a throttle plate and a brake-engaging system operatively connected to said means for engaging said first and second pluralities of brake discs for causing the engagement thereof and for stopping the rotation of said transmission output shaft when said throttle plate is at substantially zero throttle opening and the speed of said motor vehicle is low.

Claim 8

A brake system for a motor vehicle including a transmission housing having a transmission output shaft rotatably mounted therein, said system comprising a source of fluid under pressure, a first plurality of brake discs secured to said housing, a second plurality of brake discs secured to said transmission output shaft for rotation therewith, a second shaft rotatably mounted through an opening formed in the side of said housing transverse to said output shaft, means operatively connected to said second shaft for engaging said first and second pluralities of brake discs in response to rotary movement of said second shaft, a manual brake lever secured to said second shaft exterior of said housing for rotating said second shaft, normally closed valve means operatively connected to said second shaft, means operatively connected to said second shaft and to said valve means for opening said valve means when said second plurality of brake discs is moved axially into engagement with said first plurality of brake discs in response to manual actuation of said brake lever for supplying said fluid from said source to said discs as a coolant therefor, and a carburetor including a throttle plate and a brake-engaging system operatively connected to said means for engaging said first and second pluralities of brake discs for causing the engagement thereof and for stopping the rotation of said transmission output shaft when said throttle plate is at substantially zero throttle opening and the speed of said motor vehicle is low.

Claim 9

The brake system described in claim 4, wherein said brake-engaging system includes an electrical switch operatively connected to said throttle plate, a source of transmission fluid, a servomechanism operatively connected to said engaging means, a passage communicating between said source of fluid and said servomechanism, a solenoid operatively connected to said switch, valve means adjacent said passage for controlling the flow of said transmission fluid through said passage in response to energization of said solenoid by said switch, a governor for controlling the pressure of said transmission fluid in response to the speed of said motor vehicle, and a regulating valve operatively connected to said governor for regulating the flow of said transmission fluid between said first-mentioned valve means and said servomechanism when said governor pressure signal is indicative of low vehicular speed and thereby causing said servomechanism to actuate said means for engaging said first and second pluralities of brake discs.

Claim 10

The brake system described in claim 4, and a set of disc brakes, a manual brake pedal, a pump secured to said transmission output shaft for rotation therewith, first passage means communicating between said source of fluid and said pump, second passage means communicating between said pump and said set of disc brakes, second normally-closed valve means operatively connected to said first passage means, lever means operatively connected to said second valve means and said brake pedal for opening said second valve means in response to depression of said brake pedal and thereby supplying fluid to said pump for pumping said fluid through said second passage means to said disc brakes for cooling said disc brakes, and third passage means communicating between said disc brakes and said fluid source.