Multiple disc type friction brake for an automotive automatic power transmission

Claim 2

A multiple disc type friction engaging device for use in an automotive automatic power transmission including an input shaft, and output shaft, a planetary gear set operatively disposed between said input and output shafts for establishing a drive connection therebetween, said planetary gear set including first and second rotary members each having a spline formed thereon at its outer periphery, and a casing construction having at least one spline formed on the inner wall of said casing construction, said friction engaging device comprising an annular retaining plate splined to said spline of said casing construction at an intermediate portion thereof, said annular retaining plate being held axially fast on said spline at the intermediate portion thereof, first and second sets of annular rotatable plates located on both sides of said annular retaining plate, said first and second sets of annular rotatable plates being splined to said splines of said first ,nd second rotary members at their inner periphery and axially movable toward and away from said annular retaining plate, first and second sets of annular rotatably fixed plates associated with said first and second sets of annular rotatable plates and splined to said spline of said casing construction at their outer periphery to be axially movable, said first set of annular rotatably fixed plates being interleaved between said first set of annular rotatable plates while said second set of annular rotatably fixed plates are interleaved between said second set of annular rotatable plates, means defining first and second fluid chambers in said casing construction, first and second fluid pressure operated servo pistons slidably disposed in said first and second fluid chambers, respectively, said first and second fluid pressure operated servo pistons movable toward said annular retaining plate for selectively effecting engagements between said first set of annular rotatable plates and said first set of annular rotatably fixed plates and between said second set of annular rotatable plates and said second annular rotatably fixed plates when a fluid under pressure is selectively admitted to said first and second fluid chambers, and first and second return springs biasing said first and second fluid pressure operated servo pistons away from said annular retaining plate thereby effecting the disengagement of said first set of annular rotatable plates from said first set of annular rotatably fixed plates and of said second set of annular rotatable plates from said second set of annular rotatably fixed plates.

Claim 3

In combination: an automotive automatic power transmission having an input shaft, an output shaft, a planetary gear set operatively disposed between said input and output shafts for establishing a drive connection therebetween at a given gear reduction ratio, said planetary gear set having a sun gear disposed on said output shaft, a plurality of planet pinions meshing with Said sun gear, a pinion carrier fixed to said input shaft carrying the planet pinions, and an internally toothed outer ring gear meshing with said plurality of planet pinions, said outer ring gear having at least one spline formed at its outer periphery, a drum member, means mounting same to said outer ring gear of said planetary gear set including a one-way brake, said drum member having a drum portion formed with at least one spline and accommodating therein a half part of said outer ring gear of said planetary gear set, and a casing construction having at least one spline formed on the inner wall thereof; and friction engaging means comprising a retaining plate splined to said spline of said casing construction at an intermediate portion thereof, said retaining plate being held axially fast on said spline of said casing construction at the intermediate portion thereof, first and second sets of rotatable plates located on both sides of said retaining plate and splined to the splines of said outer ring gear and said drum portion, respectively, said first and second sets of rotatable plates being axially movable toward and away from said retaining plate, first and second sets of rotatably fixed plates associated with said first and second sets of rotatable plates, respectively, said first and second sets of rotatably fixed plates being splined to said spline of said casing construction and axially movable toward and away from said retaining plate, and first and second fluid pressure operated servo pistons which are axially movable toward and away qrom said retaining plate for effecting engagement and disengagement between said first and second sets of rotatable plates and said first and second sets of rotatably fixed plates.

Claim 4

In combination: an automotive automatic power transmission having an input shaft, an output shaft, a planetary gear set operatively disposed between said input and output shafts for establishing a drive connection therebetween at a given gear reduction ratio, said planetary gear set having a sun gear disposed on said output shaft, a plurality of planet pinions meshing with Said sun gear, a pinion carrier fixed to said input shaft carrying the planet pinions, and an internally toothed outer ring gear meshing with said plurality of planet pinions, said outer ring gear having at least one spline formed at its outer periphery, a drum member, means mounting same to said outer ring gear of said planetary gear set including a one-way brake, said drum member having a drum portion formed with at least one spline and accommodating therein a half part of said outer ring gear of said planetary gear set, and a casing construction having at least one spline formed on the inner wall thereof; and friction engaging means comprising a retaining plate splined to said spline of said casing construction at an intermediate portion thereof, said retaining plate being held axially fast on said spline of said casing construction at the intermediate portion thereof, first and second sets of rotatable plates located on both sides of said retaining plate and splined to the splines of said outer ring gear and said drum portion, respectively, said first and second sets of rotatable plates being axially movable toward and away from said retaining plate, first and second sets of rotatably fixed plates associated with said first and second sets of rotatable plates, respectively, said first and second sets of rotatably fixed plates being splined to said spline of said casing construction and axially movable toward and away from said retaining plate, and first and second fluid pressure operated servo pistons which are axially movable toward and away qrom said retaining plate for effecting engagement and disengagement between said first and second sets of rotatable plates and said first and second sets of rotatably fixed plates.

Claim 5

A combination according to claim 2, wherein said retaining plate includes a pair of annular backing plates which are splined to said spline of said casing construction at outer peripheral walls of said backing plates.

Claim 6

A combination according to claim 3, further comprising means holding said annular backing plates axially fast comprising a snap ring fixedly connected to said spline of said casing construction.

Claim 7

A combination according to claim 2, wherein said retaining plate includes a unitary annular backing plate which is splined to said spline of said casing construction at its outer peripheral wall.

Claim 8

A combination according to claim 5, further comprising means holding said unitary annular backing plate axially fast comprising a pair of snap rings fixedly connected to said spline of said casing construction at the intermediate portion thereof.

Claim 9

In combination: an automotive power transmission having an input shaft, an output shaft, a planetary gear set operatively disposed between said input and output shafts for establishing a drive connection therebetween at a given gear reduction ratio, said planetary gear set having a sun gear disposed on said output shaft, a plurality of planet pinions meshing with said sun gear and a pinion carrier fixed to said input shaft carrying the planet pinions and an internally toothed outer ring gear meshing with said plurality of planet pinions, said outer ring gear having at least one spline formed at its outer periphery, a drum member, means mounting same on said outer ring gear of said planetary gear set including a one-way brake, said drum member having a drum portion having at least one spline and accommodating therein a half part of said outer ring gear of said planetary gear set, and a casing construction having at least one spline formed on the inner wall thereof; and friction engaging means comprising an annular retaining plate splined to said spline of said casing construction at an intermediate portion thereof, said annular retaining plate being held axially fast on said spline of said casing construction at the intermediate portion thereof, first and second sets of annular rotatable plates located on both sides of said annular retaining plate, said first and second sets of annular rotatabLe plates being splined to said splines of said outer ring gear and said drum portion, respectively, at inner peripheries of said first and second sets of rotatable plates and axially movable toward and away from said annular retaining plate, first and second sets of annular rotatably fixed plates associated with said first and second sets of annular rotatable plates and splined to said spline of said casing construction at their outer peripheries to be axially movable, said first set of annular rotatably fixed plates being interleaved between said first sets of annular rotatable plates while said second set of annular rotatably fixed plates are interleaved between said second set of annular rotatable plates, means defining first and second fluid chambers formed in said casing construction, first and second fluid pressure operated servo pistons slidably disposed in said first and second fluid chambers, respectively, said first and second fluid pressure operated servo pistons being movable toward said annular retaining plate for effecting engagements between said first set of annular rotatable plates and said first set of annular rotatably fixed plates and between said second set of annular rotatable plates and said second set of annular rotatably fixed plates when a fluid under pressure is supplied into said first and second fluid chambers, and first and second return springs biasing said first and second fluid pressure operated servo pistons away from said annular retaining plate for effecting the disengagement of said first set of annular rotatable plates from said first set of annular rotatably fixed plates and of said second set of annular rotatable plates from said second set of annular rotatably fixed plates.

Claim 10

In combination: an automotive power transmission having an input shaft, an output shaft, a planetary gear set operatively disposed between said input and output shafts for establishing a drive connection therebetween at a given gear reduction ratio, said planetary gear set having a sun gear disposed on said output shaft, a plurality of planet pinions meshing with said sun gear and a pinion carrier fixed to said input shaft carrying the planet pinions and an internally toothed outer ring gear meshing with said plurality of planet pinions, said outer ring gear having at least one spline formed at its outer periphery, a drum member, means mounting same on said outer ring gear of said planetary gear set including a one-way brake, said drum member having a drum portion having at least one spline and accommodating therein a half part of said outer ring gear of said planetary gear set, and a casing construction having at least one spline formed on the inner wall thereof; and friction engaging means comprising an annular retaining plate splined to said spline of said casing construction at an intermediate portion thereof, said annular retaining plate being held axially fast on said spline of said casing construction at the intermediate portion thereof, first and second sets of annular rotatable plates located on both sides of said annular retaining plate, said first and second sets of annular rotatabLe plates being splined to said splines of said outer ring gear and said drum portion, respectively, at inner peripheries of said first and second sets of rotatable plates and axially movable toward and away from said annular retaining plate, first and second sets of annular rotatably fixed plates associated with said first and second sets of annular rotatable plates and splined to said spline of said casing construction at their outer peripheries to be axially movable, said first set of annular rotatably fixed plates being interleaved between said first sets of annular rotatable plates while said second set of annular rotatably fixed plates are interleaved between said second set of annular rotatable plates, means defining first and second fluid chambers formed in said casing construction, first and second fluid pressure operated servo pistons slidably disposed in said first and second fluid chambers, respectively, said first and second fluid pressure operated servo pistons being movable toward said annular retaining plate for effecting engagements between said first set of annular rotatable plates and said first set of annular rotatably fixed plates and between said second set of annular rotatable plates and said second set of annular rotatably fixed plates when a fluid under pressure is supplied into said first and second fluid chambers, and first and second return springs biasing said first and second fluid pressure operated servo pistons away from said annular retaining plate for effecting the disengagement of said first set of annular rotatable plates from said first set of annular rotatably fixed plates and of said second set of annular rotatable plates from said second set of annular rotatably fixed plates.

Claim 11

In combination: a stationary support member; an input member rotatably driven in use with respect to the support member; an output shaft rotatable about its longitudinal axis with respect to said support member; means connecting said input member to said output shaft including a first hub mounted for rotation about said longitudinal axis and having a first cylindrical drum connected at one end thereto and coaxial with said output shaft, a second hub mounted for rotation about said longitudinal axis and having a second cylindrical drum connected at one end thereto and having a portion thereof nested within said first cylindrical drum; and friction engaging means for selectively frictionally engaging the portion of said second cylindrical drum not nested within said first cylindrical drum with said support member thereby braking rotation of said second cylindrical drum and for selectively frictionally engaging said first cylindrical drum with said support member thereby braking rotation of said first cylindrical drum.

Claim 12

In combination: a stationary support member; an input member rotatably driven in use with respect to the support member; an output shaft rotatable about its longitudinal axis with respect to said support member; means connecting said input member to said output shaft including a first hub mounted for rotation about said longitudinal axis and having a first cylindrical drum connected at one end thereto and coaxial with said output shaft, a second hub mounted for rotation about said longitudinal axis and having a second cylindrical drum connected at one end thereto and having a portion thereof nested within said first cylindrical drum; and friction engaging means for selectively frictionally engaging the portion of said second cylindrical drum not nested within said first cylindrical drum with said support member thereby braking rotation of said second cylindrical drum and for selectively frictionally engaging said first cylindrical drum with said support member thereby braking rotation of said first cylindrical drum.

Claim 13

A combination according to claim 8, wherein said friction engaging means comprises a retainig plate fixedly mounted with respect to said support member, a first set of rotatable plates disposed on one side of said retaining plate and splined to said first cylindrical drum for rotational movement therewith and axial movement along said longitudinal axis, a second set of rotatable plates disposed on the other side of said retaining plate and splined to said portion of said second cylindrical drum not nested with said first cylindrical drum for rotational movement therewith and axial movement along said longitudinal axis, a first set of rotatably fixed plates disposed on said one side of said retaining plate and splined to said support member for axial movement along said longitudinal axis, a second set of rotatably fixed plates disposed on said other side of said retaining plate and splined to said support member for axial movement along said longitudinal axis, and means for selectively moving the first sets of rotatable plates and rotatably fixed plates towards said retaining plate to effect the frictional engagement of the two sets of plates thereby engaging said first cylindrical drum with said support member and for selectively moving the second sets of rotatable plates and rotatably fixed plates towards said retaining plate to effect the frictional engagement of the two sets of plates thereby engaging said portion of said second cylindrical drum not nested with said first cylindrical drum with said support member.

Claim 14

A combination according to claim 9, wherein said first sets of rotatable plates and rotatably fixed plates are interleaved and said second sets of rotatable plates and rotatably fixed plates are interleaved.

Claim 15

A combination according to claim 9, wherein said means for selectively moving comprises first and second fluid operated servo pistons driving the first sets of plates and the second sets of plates respectively along said longitudinal axis.