CA1081290A - Force transfer mechanism - Google Patents
Force transfer mechanismInfo
- Publication number
- CA1081290A CA1081290A CA306,016A CA306016A CA1081290A CA 1081290 A CA1081290 A CA 1081290A CA 306016 A CA306016 A CA 306016A CA 1081290 A CA1081290 A CA 1081290A
- Authority
- CA
- Canada
- Prior art keywords
- push rod
- bore
- plunger
- lever means
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Braking Systems And Boosters (AREA)
Abstract
A VALVE TRAVEL MECHANISM
ABSTRACT OF THE DISCLOSURE
A mechanism for multiplying the travel of a valve as compared with the travel of an input push rod member. The mechanism has a housing with a bore therethrough for retaining an accurate segmented lever. The segmented lever, which is pivotally attached to the housing, axially locates an output push rod member in the bore. A plunger attached to the input push rod has an arcuate projection which engages the segmented lever. The plunger moves In response to an operator input force causing the lever to pivot in said housing and move the output push rod at a different rate of travel than the rate of travel of the input push rod.
ABSTRACT OF THE DISCLOSURE
A mechanism for multiplying the travel of a valve as compared with the travel of an input push rod member. The mechanism has a housing with a bore therethrough for retaining an accurate segmented lever. The segmented lever, which is pivotally attached to the housing, axially locates an output push rod member in the bore. A plunger attached to the input push rod has an arcuate projection which engages the segmented lever. The plunger moves In response to an operator input force causing the lever to pivot in said housing and move the output push rod at a different rate of travel than the rate of travel of the input push rod.
Description
;~81Z~a3 The present invention relates to a travel multiplier device for use, for example, in a servomotor of the typc used in braking systems.
Most vehicles currently manu~actured in the United States are equipped with servomotor operated braking systems.
These servomotors are normally opera~ed through the actuation of a control valve by an operator supplied input force. The control valve is attached to the brake pedal through an input push rod. Arcuate movement of the brake pedal is converted into linear movement and directly transferr~d into the control valve. Movement of the control valve regulates the communication of an operational fluid supplied to the servomotor in a manner fully disclosed in U.S. Patent 3,289,5~7. The operational ~luid creates a pressure differential across a wall member which acts through an output push rod and supplies a master cylinder with an input force to pressurize the brake fluid in the system and operate the wheel brakes of a vehicle.
It has recently been observed that the time required to actuate the wheel brakes of a vehicle could be reduced if the reaction time required to bring the control valve ~;
into operation could be reduced.
The present invention resides in a servomotor having a control valve retained in a bore of a hub attache~
to a movable wall and operated through a linear input force directly and continually transmitted through an input member from a brake pedal to create a pressure differential across the movable wall and thereafter supply an output member with an operational force. The input member includes a housing attached to the hub and having a bore therethrough with a first push rod member being located in the bore and connected to the control valve. Lever means has a first sb~, ' ~ , ~081~5~0 end pivotally attached to the housing in a secon~ end connected to the first push rod member for axially aligning the first push rod in the bore. ~ plunger is located in the bore and has an annular face for con-tinually engaging the lever means. A second push rod member is connected to the brake pedal and the plunger, the second push rod member moving in response to the linear input force and causing the plunger to pivot the lever means about the first end and thereby transmit an operational movement through the second end to the first push rod member. The operational movement of the plunger is multiplied by a factor corresponding to the ratio of the distance between the first and second ends of the lever and the distance between the point of contact of the plunger on the lever means and the first end of the lever means to provide the valve means with a variable rate of operation from the linear input force.
It is therefore the object of this invention to ~ -provide a servomotor control valve with a lever mechanism for varying the movement of the control valve as aompared ~;
with the input push rod in response to an operator input ~ ~
on the brake pedal. !. ' It is another object of this invention to provide a control valve of a pneumatically operated servomotor with a mechanism for multiplying the input force from a push rod attached to a brake pedal to reduce the time required to effect a brake application.
These and other objects should be apparent from reading this specification and viewing the drawing.
BRIEF DESCRIPTION OF THE INVENTION
Figure 1 is a sectional view of a mechanism made according to the principles of this inventlon and to control .f: . . .
~; sb/l~, 9(31 the operation of a pneumatically powered servomotor in a brake system in a vehicle;
Figure 2 is a sectional view taken along line 2-2 of Figure l;
Figure 3 is a sectional view of the force transfer .
mechanism in an applied position; and Figure 4 is a sectional view of another embodiment of the ~orce transfer mechanism for transmitting an input force to an output member in accordance to the principles of this invention.
DETAILED DESCRIPTION OF THE INVENTION
In the drawing shown in Figure 1, a servomotor 0 lS connected to a master cylinder 12 for providing the front and the rear wheel brakes 14 and 16, respectively, with an operational braking signal in response to an operator input force applied to brake pedal 18.
The servomotor l0 includes a front shell 20 which i5 connected to a rear shell 22 by a twist lock arrangement 24 to produce a housing. A wall 26 which includes a backing plate 32, a diaphragm 34 and a hub 36 which divides the ~ :
interior of the housing into a front chamber 28 and a rear chamber 30. The hub 36 which extends through the rear shell 40 has a groove 38 located between an annular radial pro-jection 40 and a lip 42. The backing plate 32 has a rib 44 which surrounds the peripheral surface of radial pro-jection 40 to position end 46 adjacent the radial projection 40. A bead 48 on diaphragm 34 which snaps into groove 38 ~ .
provides a continual resilient force for holding.the backing . plate 32 against the radial projection 40. The diaphragm : -42 also has a bead (not shown) which is located between the front shell 40 and rear shell by the twist lock connection 24 to assure that an air tight seal exists between the front chamber 28 and the rear chamber 30. The hub 36 - ch /~ .~
.. ,, : .:
~ 129~D ~
also has a first passage 60 which connects the front chamber 28 with the stepped axial bore 56 and a second passage 62 which connects the stepped axial bore 56 with the rear chamber 30. The hub 36 has an annular rearward projection 50 which extends through an opening 52 in the rear shell 22.
A seal 54 surrounds projection 50 to prevent air from entering the rear chamber 30 through opening 52. The stepped axial bore 56 which extends through the rearward projection 50 retains a control valve 58 for operating the servomotor lO in response to an operator input force on brake pedal 18.
The control valve 58 has a flexible poppet member 64 with a first end 68 fixed to the interior of the pro-jection 50 by a retainer 66 and a second end 70 which is free to move within the axial bore 56. A disc 72 located in a groove 74 provides a support for one end of spring 76 while the other end of the spring engages retainer 78 on push rod 80. A return spring 82 located between retainer 66 and retainer 78 urges face 84 on plunger 86 against the second end 70 of the flexible poppet member 64 to allow vacuum present in the front chamber 28 to evacuate air from the : :
rear chamber 30 by flowing through the second passage 62, ~ ~ `
axial bore 56, and the first passage 60. The pressure level in the front chamber 28 is maintained below atmospheric ~ ~.
pressure since a vacuum produced at the manifold 88 of the vehicle evacuates air therefrom through conduit 90. When the fluid pressure in the front and rear chambers 28 and 30 are substantially equal, a return spring 92 located in the front chamber 28 acts on the radial projection 40 of the hub :
36 to position wall 26 against the rear shell 22 as shown in Figure 1.
A reaction disc 94 located in the stepped axial bore 56 transmits an input force into the output push rod 96 sb/~
~08~ V
~hich operates the mast~r cylinder 12 in response to an operator braking signal. The operator braking signal is transmitted into the control valve 58 through a mechanism 100 connected to push rod 102.
The mechanism 100 has a housing 10~ with a stepped axial bore 106 located therein. An end cap 108 attached to the end of the projection 50 of the hub 36 has an annular projection 110 extending therefrom in a plane parallel to axial bore 56. A first diameter section 112 of the stepped bore 106 is matched to the peripheral surface of cap 108.
The housing 104 has a groove 109 in the first diameter section 112 adjacent the end 114. A snap ring 116 located in groove 109 attaches housing 104 to the end cap 108 on projection 50 of the hub 36.
A plurality of arcuate lever arms 118, 120, 122, 124 each have a first end located in the irst diameter ~:
section 112 of h.ousing 104 between sh.oulder 126 ana the annular projection 110 of the end cap 108 and a second end located in a groove 128 on the end of push rod 80. A spring 130 which is located in a second diameter section of bore . .,-106 has a first end retained by shoulder 132 and a second end which engages the arcuate lever arms 118, 120, 122 a~d 124. The spring 130 urges the lever arms toward projection 110 on end cap 108 and rib 134 on push rod 80.
A plunger 136 located in a third diameter section 138 of stepped bore 106 has a projection 140 which extends into engagement with the plurality of arcuate arms 118, 120 and 122 and 124. The housing 104 has a groove 142 ln which snap ring 144 is located to prevent plunger 136 rom being expelled from bore 106 by return spring 82. The~plunger 136 has a spherical socket 146 for retaining ball end 148 of push rod 102. The eye end 150 of push rod 102 pivots on sb~
~0~3~Z9(~
pin 152 as brake pedal 18 rotates on pin 154 in response to an operator input force to the pedal pad 158. ln transferring the arcuate motion of the brake pedal arm 18 to linear motion, the push rod 102 rotates ~bout ball 148 as plunger 136 moves in a linear path in bore 106. ~lowever, the control valve 58 remains in the axial center of bore 56 since the arcuate lever arms 118, 120, 122 and 124 position push rod 80 in the axial center o~ bore 56.
MODE OF OPERATION OF THE INVENTIO~
When an internal combustion engine is running, a vacuum is produced at the intake manifold 88. This vacuum is communicated~through conduit 90 to the front chamber 28 of the brake actuator servomotor lOo Any air present in the rear chamber 30, flows through the second passage 62 into bore 56, around vacuum seat 69 through the first passage 60 and into the front chamber 28 to the intake manifold 88 to vacuum suspend the wall 26. ~ ~:
When the operator desires to effect a brake application, an input force is applied to brake pedal pad 18.
This input force causes the brake pedal 18 to rotate on pin 154 and impart linear movement to push rod 102 for moving plunger 136 in bore 106. The annular projection 140 on plunger 136 engages the arcuate lever arms 118, 120, 122 and 124 causing the same to rotate about the fixed end ~s illustrated in Figure 3 and supply the push rod 80 with a linear multiplied movement to move plunger 86 in bore 56.
Initial movement of plunger 86 allows spring 76 to seat face 70 of the poppet member 64 on vacuum seat 69 and interrupt communication of vacuum between the front and rear chambers 28 and 30.
Further movement of plunger 86 causes face 84 to ~ ' move away from face 70 and allow air to flow into the rear chamber 30 through.the second passage 62 from bore 56 and -~r '~ 6 -sb/~;~
~LO~lZ9~
create a pressure di~ferential across wall 26. This pressure differential which acts on wall 26 is trans~itted into reaction disc 94 through backing plate 32 and hub 36 to provide push rod 96 with a force to operate the master cylinder 12 and provide the front and rear brakes 14 and 16 with an actuation signal to effect braking of the vehicle.
When the input force is removed from the brake pedal 18, return spring 82 moves the plunger 86 into engagement with face 70 to again allow r''~`~ ~ 6a - .
sb/J~ . .
- . .. .
vacuum In the front chamber 28 to remove atr from the rear chamber 30 and terminates the input force operating the master cyl7nder~
The Input movement from push rod 102 Is multiplied as 7t passes through mechanism 100 by a factor equal to the total length of each of the arcuate lever arms divTded by the distance between the point of contac~ o~ the projection 140 on plunger 136 and the fixed end of the arcuate lever arms. As an example, if the arcuats projection 140 engages the arcuate lever arms 118, 120, 122 and 124 in the mid point, a multiplication factor of 2 is obtained in the input travel or movement of the control valve 58. Thus, if the brake pedal travel factor is 10 selected at a ratio of 3:1 as Ts normal for manually operated brake systems, ~ ;
when th~ power assist from the servomotor is avatlable, a travel increase of 6:1 is achieved by the time the input movemen~ is supplied to the control valve 58 of the servomotor.
In the mechanism illustrated in Figure 4, the projection 50 of the hub 36 has a series of sockets 200 located along the Tnterior of bore 56~
Each of the arcuate lever arms 118, 120, 122 and 124 has a corresponding ball, (only 202 and 206 are shown) located in a socket 7n the housing 50. The output ~
member or push rod has a series of slots (only 210, 212, are shown) for receiving -the free end of the arcuate lever arms 118, 120, 122 and 124 to maintain the same ~ .
in a radial plane perpendicular to push rod 80 while positioning the push rod 80 in the canter of bore 56.
In operation, the input force from push rod 102 moves plunger 140 in bore 56 into engagement with the arcuate lever arms 118, 120, 122 and 124.
This 7nput force exerte~i on the lever arms 118, 120, 122 and 124 causss ~he lever arms 118, 120, 122 and 124 to pivot on balls 200, 202, 204 and 206 and impart a multiplied input travel to the push rod 80 through the free end in the same manner as the lever arrangement in Figurs 1.
`
Most vehicles currently manu~actured in the United States are equipped with servomotor operated braking systems.
These servomotors are normally opera~ed through the actuation of a control valve by an operator supplied input force. The control valve is attached to the brake pedal through an input push rod. Arcuate movement of the brake pedal is converted into linear movement and directly transferr~d into the control valve. Movement of the control valve regulates the communication of an operational fluid supplied to the servomotor in a manner fully disclosed in U.S. Patent 3,289,5~7. The operational ~luid creates a pressure differential across a wall member which acts through an output push rod and supplies a master cylinder with an input force to pressurize the brake fluid in the system and operate the wheel brakes of a vehicle.
It has recently been observed that the time required to actuate the wheel brakes of a vehicle could be reduced if the reaction time required to bring the control valve ~;
into operation could be reduced.
The present invention resides in a servomotor having a control valve retained in a bore of a hub attache~
to a movable wall and operated through a linear input force directly and continually transmitted through an input member from a brake pedal to create a pressure differential across the movable wall and thereafter supply an output member with an operational force. The input member includes a housing attached to the hub and having a bore therethrough with a first push rod member being located in the bore and connected to the control valve. Lever means has a first sb~, ' ~ , ~081~5~0 end pivotally attached to the housing in a secon~ end connected to the first push rod member for axially aligning the first push rod in the bore. ~ plunger is located in the bore and has an annular face for con-tinually engaging the lever means. A second push rod member is connected to the brake pedal and the plunger, the second push rod member moving in response to the linear input force and causing the plunger to pivot the lever means about the first end and thereby transmit an operational movement through the second end to the first push rod member. The operational movement of the plunger is multiplied by a factor corresponding to the ratio of the distance between the first and second ends of the lever and the distance between the point of contact of the plunger on the lever means and the first end of the lever means to provide the valve means with a variable rate of operation from the linear input force.
It is therefore the object of this invention to ~ -provide a servomotor control valve with a lever mechanism for varying the movement of the control valve as aompared ~;
with the input push rod in response to an operator input ~ ~
on the brake pedal. !. ' It is another object of this invention to provide a control valve of a pneumatically operated servomotor with a mechanism for multiplying the input force from a push rod attached to a brake pedal to reduce the time required to effect a brake application.
These and other objects should be apparent from reading this specification and viewing the drawing.
BRIEF DESCRIPTION OF THE INVENTION
Figure 1 is a sectional view of a mechanism made according to the principles of this inventlon and to control .f: . . .
~; sb/l~, 9(31 the operation of a pneumatically powered servomotor in a brake system in a vehicle;
Figure 2 is a sectional view taken along line 2-2 of Figure l;
Figure 3 is a sectional view of the force transfer .
mechanism in an applied position; and Figure 4 is a sectional view of another embodiment of the ~orce transfer mechanism for transmitting an input force to an output member in accordance to the principles of this invention.
DETAILED DESCRIPTION OF THE INVENTION
In the drawing shown in Figure 1, a servomotor 0 lS connected to a master cylinder 12 for providing the front and the rear wheel brakes 14 and 16, respectively, with an operational braking signal in response to an operator input force applied to brake pedal 18.
The servomotor l0 includes a front shell 20 which i5 connected to a rear shell 22 by a twist lock arrangement 24 to produce a housing. A wall 26 which includes a backing plate 32, a diaphragm 34 and a hub 36 which divides the ~ :
interior of the housing into a front chamber 28 and a rear chamber 30. The hub 36 which extends through the rear shell 40 has a groove 38 located between an annular radial pro-jection 40 and a lip 42. The backing plate 32 has a rib 44 which surrounds the peripheral surface of radial pro-jection 40 to position end 46 adjacent the radial projection 40. A bead 48 on diaphragm 34 which snaps into groove 38 ~ .
provides a continual resilient force for holding.the backing . plate 32 against the radial projection 40. The diaphragm : -42 also has a bead (not shown) which is located between the front shell 40 and rear shell by the twist lock connection 24 to assure that an air tight seal exists between the front chamber 28 and the rear chamber 30. The hub 36 - ch /~ .~
.. ,, : .:
~ 129~D ~
also has a first passage 60 which connects the front chamber 28 with the stepped axial bore 56 and a second passage 62 which connects the stepped axial bore 56 with the rear chamber 30. The hub 36 has an annular rearward projection 50 which extends through an opening 52 in the rear shell 22.
A seal 54 surrounds projection 50 to prevent air from entering the rear chamber 30 through opening 52. The stepped axial bore 56 which extends through the rearward projection 50 retains a control valve 58 for operating the servomotor lO in response to an operator input force on brake pedal 18.
The control valve 58 has a flexible poppet member 64 with a first end 68 fixed to the interior of the pro-jection 50 by a retainer 66 and a second end 70 which is free to move within the axial bore 56. A disc 72 located in a groove 74 provides a support for one end of spring 76 while the other end of the spring engages retainer 78 on push rod 80. A return spring 82 located between retainer 66 and retainer 78 urges face 84 on plunger 86 against the second end 70 of the flexible poppet member 64 to allow vacuum present in the front chamber 28 to evacuate air from the : :
rear chamber 30 by flowing through the second passage 62, ~ ~ `
axial bore 56, and the first passage 60. The pressure level in the front chamber 28 is maintained below atmospheric ~ ~.
pressure since a vacuum produced at the manifold 88 of the vehicle evacuates air therefrom through conduit 90. When the fluid pressure in the front and rear chambers 28 and 30 are substantially equal, a return spring 92 located in the front chamber 28 acts on the radial projection 40 of the hub :
36 to position wall 26 against the rear shell 22 as shown in Figure 1.
A reaction disc 94 located in the stepped axial bore 56 transmits an input force into the output push rod 96 sb/~
~08~ V
~hich operates the mast~r cylinder 12 in response to an operator braking signal. The operator braking signal is transmitted into the control valve 58 through a mechanism 100 connected to push rod 102.
The mechanism 100 has a housing 10~ with a stepped axial bore 106 located therein. An end cap 108 attached to the end of the projection 50 of the hub 36 has an annular projection 110 extending therefrom in a plane parallel to axial bore 56. A first diameter section 112 of the stepped bore 106 is matched to the peripheral surface of cap 108.
The housing 104 has a groove 109 in the first diameter section 112 adjacent the end 114. A snap ring 116 located in groove 109 attaches housing 104 to the end cap 108 on projection 50 of the hub 36.
A plurality of arcuate lever arms 118, 120, 122, 124 each have a first end located in the irst diameter ~:
section 112 of h.ousing 104 between sh.oulder 126 ana the annular projection 110 of the end cap 108 and a second end located in a groove 128 on the end of push rod 80. A spring 130 which is located in a second diameter section of bore . .,-106 has a first end retained by shoulder 132 and a second end which engages the arcuate lever arms 118, 120, 122 a~d 124. The spring 130 urges the lever arms toward projection 110 on end cap 108 and rib 134 on push rod 80.
A plunger 136 located in a third diameter section 138 of stepped bore 106 has a projection 140 which extends into engagement with the plurality of arcuate arms 118, 120 and 122 and 124. The housing 104 has a groove 142 ln which snap ring 144 is located to prevent plunger 136 rom being expelled from bore 106 by return spring 82. The~plunger 136 has a spherical socket 146 for retaining ball end 148 of push rod 102. The eye end 150 of push rod 102 pivots on sb~
~0~3~Z9(~
pin 152 as brake pedal 18 rotates on pin 154 in response to an operator input force to the pedal pad 158. ln transferring the arcuate motion of the brake pedal arm 18 to linear motion, the push rod 102 rotates ~bout ball 148 as plunger 136 moves in a linear path in bore 106. ~lowever, the control valve 58 remains in the axial center of bore 56 since the arcuate lever arms 118, 120, 122 and 124 position push rod 80 in the axial center o~ bore 56.
MODE OF OPERATION OF THE INVENTIO~
When an internal combustion engine is running, a vacuum is produced at the intake manifold 88. This vacuum is communicated~through conduit 90 to the front chamber 28 of the brake actuator servomotor lOo Any air present in the rear chamber 30, flows through the second passage 62 into bore 56, around vacuum seat 69 through the first passage 60 and into the front chamber 28 to the intake manifold 88 to vacuum suspend the wall 26. ~ ~:
When the operator desires to effect a brake application, an input force is applied to brake pedal pad 18.
This input force causes the brake pedal 18 to rotate on pin 154 and impart linear movement to push rod 102 for moving plunger 136 in bore 106. The annular projection 140 on plunger 136 engages the arcuate lever arms 118, 120, 122 and 124 causing the same to rotate about the fixed end ~s illustrated in Figure 3 and supply the push rod 80 with a linear multiplied movement to move plunger 86 in bore 56.
Initial movement of plunger 86 allows spring 76 to seat face 70 of the poppet member 64 on vacuum seat 69 and interrupt communication of vacuum between the front and rear chambers 28 and 30.
Further movement of plunger 86 causes face 84 to ~ ' move away from face 70 and allow air to flow into the rear chamber 30 through.the second passage 62 from bore 56 and -~r '~ 6 -sb/~;~
~LO~lZ9~
create a pressure di~ferential across wall 26. This pressure differential which acts on wall 26 is trans~itted into reaction disc 94 through backing plate 32 and hub 36 to provide push rod 96 with a force to operate the master cylinder 12 and provide the front and rear brakes 14 and 16 with an actuation signal to effect braking of the vehicle.
When the input force is removed from the brake pedal 18, return spring 82 moves the plunger 86 into engagement with face 70 to again allow r''~`~ ~ 6a - .
sb/J~ . .
- . .. .
vacuum In the front chamber 28 to remove atr from the rear chamber 30 and terminates the input force operating the master cyl7nder~
The Input movement from push rod 102 Is multiplied as 7t passes through mechanism 100 by a factor equal to the total length of each of the arcuate lever arms divTded by the distance between the point of contac~ o~ the projection 140 on plunger 136 and the fixed end of the arcuate lever arms. As an example, if the arcuats projection 140 engages the arcuate lever arms 118, 120, 122 and 124 in the mid point, a multiplication factor of 2 is obtained in the input travel or movement of the control valve 58. Thus, if the brake pedal travel factor is 10 selected at a ratio of 3:1 as Ts normal for manually operated brake systems, ~ ;
when th~ power assist from the servomotor is avatlable, a travel increase of 6:1 is achieved by the time the input movemen~ is supplied to the control valve 58 of the servomotor.
In the mechanism illustrated in Figure 4, the projection 50 of the hub 36 has a series of sockets 200 located along the Tnterior of bore 56~
Each of the arcuate lever arms 118, 120, 122 and 124 has a corresponding ball, (only 202 and 206 are shown) located in a socket 7n the housing 50. The output ~
member or push rod has a series of slots (only 210, 212, are shown) for receiving -the free end of the arcuate lever arms 118, 120, 122 and 124 to maintain the same ~ .
in a radial plane perpendicular to push rod 80 while positioning the push rod 80 in the canter of bore 56.
In operation, the input force from push rod 102 moves plunger 140 in bore 56 into engagement with the arcuate lever arms 118, 120, 122 and 124.
This 7nput force exerte~i on the lever arms 118, 120, 122 and 124 causss ~he lever arms 118, 120, 122 and 124 to pivot on balls 200, 202, 204 and 206 and impart a multiplied input travel to the push rod 80 through the free end in the same manner as the lever arrangement in Figurs 1.
`
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a servomotor having a control valve retained in a bore of a hub attached to a movable wall and operated through a linear input force directly and continually transmitted through an input member from a brake pedal to create a pressure differential across the movable wall and thereafter supply an output member with an operational force, the improvement wherein said input member includes:
a housing attached to said hub and having a bore therethrough;
a first push rod member located in said bore and connected to said control valve;
lever means having a first end pivotally attached to said housing and a second end connected to said first push rod member for axially aligning said first push rod in said bore; and a plunger located in said bore and having an annular face for continually engaging said lever means;
a second push rod member connected to said brake pedal and said plunger, said second push rod member moving in response to said linear input force and causing said plunger to pivot said lever means about said first end and thereby transmit an operational movement through said second end to said first push rod member, said operational movement of said plunger being multiplied by a factor corresponding to the ratio of the distance between the first and second ends of the lever and the distance between the point of contact of said plunger on the lever means and the first end of the lever means to provide said valve means with a variable rate of operation from the linear input force.
a housing attached to said hub and having a bore therethrough;
a first push rod member located in said bore and connected to said control valve;
lever means having a first end pivotally attached to said housing and a second end connected to said first push rod member for axially aligning said first push rod in said bore; and a plunger located in said bore and having an annular face for continually engaging said lever means;
a second push rod member connected to said brake pedal and said plunger, said second push rod member moving in response to said linear input force and causing said plunger to pivot said lever means about said first end and thereby transmit an operational movement through said second end to said first push rod member, said operational movement of said plunger being multiplied by a factor corresponding to the ratio of the distance between the first and second ends of the lever and the distance between the point of contact of said plunger on the lever means and the first end of the lever means to provide said valve means with a variable rate of operation from the linear input force.
2. The invention as recited in claim 1, and further including:
a spring for urging said lever means into constant engagement with said first push rod member.
a spring for urging said lever means into constant engagement with said first push rod member.
3. The invention as recited in claim 1, wherein said first push rod member has a groove therein for retaining said second end of said lever means.
4. The invention as defined in claim 1, and further comprising a cap member having a stepped bore therethrough, said stepped bore having a first diameter section separated from a second diameter section by a first shoulder, said plunger being located in said first diameter section.
5. The invention as recited in claim 4, wherein said lever means includes:
a series of arcuate segements through which the input force from the plunger is transmitted into said first push rod.
a series of arcuate segements through which the input force from the plunger is transmitted into said first push rod.
6. The invention as recited in claim 5, further including:
a fastener connected to said cap member for preventing movement between said cap and said housing.
a fastener connected to said cap member for preventing movement between said cap and said housing.
7. The invention as recited in claim 1, wherein said lever means includes:
a plurality of arcuate segments, each arcuate segment having a spherical member attached to said first end, each of said spherical members being located in a corresponding socket in said housing.
a plurality of arcuate segments, each arcuate segment having a spherical member attached to said first end, each of said spherical members being located in a corresponding socket in said housing.
8. The invention as recited in claim 7, wherein said first push rod has a series of arcuate slots located on a radial plane perpendicular to said bore for receiving said second end of each arcuate segment to maintain said push rod in axial alignment in said bore.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US81254877A | 1977-07-05 | 1977-07-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1081290A true CA1081290A (en) | 1980-07-08 |
Family
ID=25209931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA306,016A Expired CA1081290A (en) | 1977-07-05 | 1978-06-22 | Force transfer mechanism |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5417475A (en) |
| AR (1) | AR213498A1 (en) |
| CA (1) | CA1081290A (en) |
| IT (1) | IT1097073B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62168253U (en) * | 1986-04-15 | 1987-10-26 |
-
1978
- 1978-06-22 CA CA306,016A patent/CA1081290A/en not_active Expired
- 1978-06-28 IT IT25061/78A patent/IT1097073B/en active
- 1978-07-05 JP JP8104478A patent/JPS5417475A/en active Granted
- 1978-07-08 AR AR27282278A patent/AR213498A1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT7825061A0 (en) | 1978-06-28 |
| JPS5417475A (en) | 1979-02-08 |
| JPS6153266B2 (en) | 1986-11-17 |
| AR213498A1 (en) | 1979-01-31 |
| IT1097073B (en) | 1985-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |