CA1112268A - Master cylinder - Google Patents
Master cylinderInfo
- Publication number
- CA1112268A CA1112268A CA322,538A CA322538A CA1112268A CA 1112268 A CA1112268 A CA 1112268A CA 322538 A CA322538 A CA 322538A CA 1112268 A CA1112268 A CA 1112268A
- Authority
- CA
- Canada
- Prior art keywords
- bore
- master cylinder
- sleeve
- recited
- diameter section
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
- B60T11/20—Tandem, side-by-side, or other multiple master cylinder units
Abstract
A MASTER CYLINDER
ABSTRACT OF THE DISCLOSURE
A master cylinder has a housing with a bore therein having a tapered section located between first and second compensator ports con-necting the bore to a reservoir. A sleeve locates first and second lip seals adjacent the first and second compensator ports, respectively. A
first piston engages the first lip seal and a second piston engages the second lip seal to define first and second chambers within the bore. A
bearing member which surrounds the first piston engages the sleeve and holds the first and second lip seals in a stationary position within the bore. Thereafter, an input member moves the first and second pistons past the first and second lip seals to pressurize the fluid in the first and second chambers and provides fluid pressure responsive devices with an operational input through first and second outlet ports in the housing.
ABSTRACT OF THE DISCLOSURE
A master cylinder has a housing with a bore therein having a tapered section located between first and second compensator ports con-necting the bore to a reservoir. A sleeve locates first and second lip seals adjacent the first and second compensator ports, respectively. A
first piston engages the first lip seal and a second piston engages the second lip seal to define first and second chambers within the bore. A
bearing member which surrounds the first piston engages the sleeve and holds the first and second lip seals in a stationary position within the bore. Thereafter, an input member moves the first and second pistons past the first and second lip seals to pressurize the fluid in the first and second chambers and provides fluid pressure responsive devices with an operational input through first and second outlet ports in the housing.
Description
Z~ 3 This invention relates to a master c~linder.
The manufacture of master cyllnders is usually achieved through either sand or permanent mold cas:ing o~
molten metal to a particular shape. l~hen the molten metal has cooled the sand or core is removed from any cavities therein. As the molten me~al cools, a uniform dense surface is created on the periphery of the casting, however, some voids may occur internally. Thereafter when the casting is machined to its final tolerance, such as the master lO cylinder housing disclosed in U.S. Patent 3,701,257, it is possible that some of the voids may be exposed in the pressurizing chambers. If a master cylinder were assembled having a void exposed in the bore, in addition to providing a possible leak path for the high pressure fluid in the pressurizing chamber, it is possible to damage the seals -~ as they are moved past such voids. Thus once a void is exposed in the bore through machining for safety, the master cylinder casting is automatically scrapped. It is estimated that between 2 and 5 per cent of the castings manufactured 20 during any given period of time are scrapped because of the potential hazards created by the exposure of voids during machining.
-It has been observed that die casting, when compared with sand or permanent mold castings, produces a smoother surface finish with thinner dimensions and closer manufacturing tolerances.
I have devised a master cylinder having a die cast housing with a piston arrangcrnent thereln whLch eliminates the need for machlnLrlg the operatlonal bore and thereby reduces the scrap rnte and machinLng cost in the manufacturing of a mclC;ter cyl:Lnder.
According to the present inventlon there is tm/Cc~ -2-.~ ~
provided a master cylinder havlng a houslng wlth a bore thereln, the housing hav-Lng flrst and second inlet ports for connecting the bore to a reservoir and first and second outlet ports. A sleeve is located in the bore, and first and second seals are positioned adjacent the first and second inlet ports, respectively, each of the first and second seals having passages to define definite flow paths between the first and second inlet ports and the bore.
Bearing means engage the sleeve to hold the ~irst and second seals in a stationary position within the bore, and a piston means is provided which has first and second cylindrical members located in the sleeve and engaging the first and second seal to define first and second chambers in the bore. An input means is responsive to an input force for moving the first and second cylindrical members past a first and second seals to interrupt communication between the reservoir and the bore through the definite flow paths to allow further movement of the first and second cylindrical members to pressurize the fluid in the first and second chambers and thereby supply the fluid pressure responsive devices with operational fluid through the first and second outlet ports.
A return spring arrangement is provided in a specific embodiment of the invention, and when the input force terminates, the first and second cylindrical members are moved toward a rest position to allow free communication between the first and second chambers through the compensator port to the reservoir. To assure such free communication, the first and second seals have a plurality of ~,rooves on tlle externaL
surfaces thereof and the flrst and second pl;tolls have a corresponding plural:Lty of fluted surfaces to estcLblish a positive flo~7 path through which fluLd ls communlcated to tm/(~ ~
$~
the first and second chambers.
It is therefore an object oF this invention to provide a master cylinder having a die cast surface with a piston arrangement to pressuri~e the fluid therein in response to an operator input force.
In one emodiment of the invention, the master cylinder has a tapered operational bore therein with a piston arrangement through which fluid is pressurized and supplied to a fluid pressure responsive dev:ice~
These and other objects should be apparent from reading this specification and viewing the drawings.
~RIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic illustration of a brake system having a sectional view of a master cylinder made according to the principles of this invention;
Figure 2 is an e~ploded perspective view of the piston assembly of the master cylinder of Figure l;
` Figure 3 is a sectional view of circumscribed line 3 of Figure 1 showing the relationship between the sleeve, lip seal, primary piston and tm/~ 3a-..'~sJ
., ~ _ bearing member of the piston assembly in a released position;' Figure 4 is a sectional ~iew taken along line 4-4 of Figure 3; and Figure 5 is a sectional view of circurrlscribed line 3 of Figure 1 showing the relationship between the sleeve, lip seal, primary piston and bearing member of the piston assembly in an operational position.
DE L~D ~s~R P~ ~ CF THE INVE NTION
In the brake sys~em 10 shown in Figure 1, a master cylinder 12 i5 connected to the front wheel brakes 14 and the rear wheel brakes 16 by conduits 18 and 20 respectively. In response to an operational inpu~
lQ applied from brake pedal 22 through push rod 24, the rnaster cylinder 12 is operated to effect a brake application.
In more part;cular detail, the master cylinder 12 has a die cas.
houstng 26 with a bore 28 located therein. 80re 28 has a series of steps 30, 32, 34, 36 and 38 which have a slope or taper of about 1 with respect to an axîal plane through bore 28. Suçh a slope or taper is placed in the housing during die casting and is necessary to permit the removal of a die cast core after the metal in the housing 26 has cooled from a molten condition.
The housing 26 has a first compensator port 40 and a second compensator port 42 through which bore 28 is connected with compartments 44 and 46, respectively, in the fluid reservoir.
A piston assembly 48 which is located Tn bore 28 has a first piston 52 and a second piston 54, As shown in FIgure 2, the second piston 54 has a cylindrical body 60 with a first diameter and a second diameter. The cylindrlcal body 60 has a bore 62 which extends through the first diameter and into the second diameter. A series of openings 64, 64~, 64", and 64"', connects tne bore 62 with bore 28. A retainer 55 located 1n bore 62 has a stem 66 att2ched to piston 52 for ca3ing spring 58 and thereby inttially establish a distance between pistons 5~ and 54 to establish the size of a first pressure chamber 56 in bore 28.
Piston 54 has an outwardly proje-:tlng lip 70 which engages one end of spring 59 to hold the second piston 54 away from the bo~tGm of bore 2 and establish the size of a second pressurizing chamber 72.
A sleeve member 74 has a first end 76 that engages shoulder 78 to locate a second end 80 adjacent compensator port 42 and a lip seal 115 in step 32 of bore 28 to control communication of fluid between chambers 46 and 72. Slee\~e member 74 has a shoulder 82 that locates 0-ring seal 84 against shoulder 86 to preven~ fluid communication from chamber 56 between steps 32 and 34 of bore 28 and a shoulder 88 that positions 0-ring seal 90 against shoulder 92 to prevent fluid communication from chamber 56 between steps 34 ~nd 36.
Similarly, an 0-ring seal 94 located adjacent rib 96 of the sleeve member 74 by spring retainer 98, engages the cylindrical body 60 of piston 54 to prevent fluid communication between chambers 56 and 72.
As illustrated in Figures 1 and 2, sleeve member 74 has a leg 100 ~ that aligns its cylindrical body 102 within bore 28 to compensate for the taper or slope in step 34 between the first and second compensator ports 40 and 42. Lip 70 engages the interior surface 104 and cylindrical body 102 engages bearing surface 106 of rib 96 to align or centrally position piston 54 in step 32 of bore 28.
A bearing member 110 which surrounds the cylindrical body of piston 52 engages end 76 of sleeve 74 to position a-lip seal 114 adjacenc leg 100 and align passages 112 with compensator port 40 and groove 113 in bearin~ 110, A
seal 116 located in groove 118 o~ the bearing member 110 prevents fluid com-munication from compensator port 40 to the surrounding environment along step 38 of bore 28.
A snap ring or other fastener 140 engages bearing member 110 to hold the piston assembly 48 within the bore 28.
To assure that bore 28 is communicated with the reservoir, lip sea1s 114 and 115 and pistons 52 and 54 cooperate to deflne posltive fiow paths, as shown in F1gures 3 and 4, between chamber 56 and compartrl.en~ 42 and chamber 72 and compartment 46, respectively.
Lip seals 114 and 115 are ident;cal with except:Lon of size and thus th~ speciE:ic details shown ~it'h respect to lip seal 114 in ~igures 3 and 4 are e~lually applicable to lip seal 115.
Lip seal 114 has an annular base with le~s 122 and 124 attached thereto. A series oE radial grooves 126, only one being shown in Figures 3 and 4, which are located on the back side 128 of the base 120 provide a flow path from groove 113 in bearing 110 to the cylindrical surface 130 of piston 52. ~ groove 132 on the peripheral surface 134 of leg 122 ~ connects the radial grooves 126 with a series of ~luted '~ grooves 136 on the end of the cylindrical surface 130 to deEine a positive flow path between compartment 44 into - chamber 56 to maintain the fluid therein in completely filled condition.
cover member 140 having a cap 242 and a diaphragm 244 is attached to housing 260. ~he diaphragm 244 has a ~:
first bead 146 on its peripheral surface and a second bead 148 which separates the diaphragm 244 into two sections, 152 and 154. A first groove 156 is located in the first section 152 and a second groove 158 is located in the second section 154. The cap 242 has ribs 16~ and 162 thereon which are located in grooves 256 and 158 to resiliently bias the diaphram 144 toward walls 164, 166 and 168 and attach the cover member 140 to the housing 26 and thereby seal compartments 44 and 46 from the surrounding environment.
MODE OF OP~R~TIO_ _F Tlll~, VRN'L''LON
When an operator desLres to make a br~ke npplication in a veh:Lcl.e e~lll:i.pped with n brclke systelll ns shown in Figure 1, an irlpl~t ~orce appl.lcd to pad 23 ca~ses pedal 22 to move in an arc about pin 25 and provide pnsh - tm/~ 6~
rod 24 with a linear input. This l:lnear input s-imultaneously moves the fluted grooves 136 and 137 on pistons 52 and 54 past grooves 132 and 133 as return spring 59 is overcome to interrupt communication between chambers 56 and 72 and compartments 44 and 46, respectively. Movement of pistons 52 and 54 into chambers 56 and 72 causes a f].uid pressure to proportionally tml~ 6a-, ~ ~
increase -therein and supply ~heel brakes 14 and 16 wi~h fluid pressure to effect a brake applicativn.
As shown in Figure 5, ~he lip seal 114 remains stationary as piston 52 m~ves into chamber 56 to pressurize the fluid therein. The fluid pressure in chamber 56 acts on lip seal 114 to hold leg 124 against sleeve 74, surface 128 against bearing 110 and surface 134 of leg 122 against the cylindrical surface 130 of piston 52 to pre~er,t fluid communication to compartment 44 of the reservoir.
Upon termination of the input force on pedal 22, return spring 59 acts on the second piston 54 and moves the first and second pistons S2 and 54 toward stop 140. As tips 142 and 144 of fluted grooves 136 and 137 reach grooves 132 and 133, fluid communication between chambers 56 and 72 and reservoir compartment 44 and 46 is initiated through a defined flow pa~h established by grooves 126 to assure tha~ any fluid which could be lost from the brake system is replenished prior to another application of input brake force by an operator.
The manufacture of master cyllnders is usually achieved through either sand or permanent mold cas:ing o~
molten metal to a particular shape. l~hen the molten metal has cooled the sand or core is removed from any cavities therein. As the molten me~al cools, a uniform dense surface is created on the periphery of the casting, however, some voids may occur internally. Thereafter when the casting is machined to its final tolerance, such as the master lO cylinder housing disclosed in U.S. Patent 3,701,257, it is possible that some of the voids may be exposed in the pressurizing chambers. If a master cylinder were assembled having a void exposed in the bore, in addition to providing a possible leak path for the high pressure fluid in the pressurizing chamber, it is possible to damage the seals -~ as they are moved past such voids. Thus once a void is exposed in the bore through machining for safety, the master cylinder casting is automatically scrapped. It is estimated that between 2 and 5 per cent of the castings manufactured 20 during any given period of time are scrapped because of the potential hazards created by the exposure of voids during machining.
-It has been observed that die casting, when compared with sand or permanent mold castings, produces a smoother surface finish with thinner dimensions and closer manufacturing tolerances.
I have devised a master cylinder having a die cast housing with a piston arrangcrnent thereln whLch eliminates the need for machlnLrlg the operatlonal bore and thereby reduces the scrap rnte and machinLng cost in the manufacturing of a mclC;ter cyl:Lnder.
According to the present inventlon there is tm/Cc~ -2-.~ ~
provided a master cylinder havlng a houslng wlth a bore thereln, the housing hav-Lng flrst and second inlet ports for connecting the bore to a reservoir and first and second outlet ports. A sleeve is located in the bore, and first and second seals are positioned adjacent the first and second inlet ports, respectively, each of the first and second seals having passages to define definite flow paths between the first and second inlet ports and the bore.
Bearing means engage the sleeve to hold the ~irst and second seals in a stationary position within the bore, and a piston means is provided which has first and second cylindrical members located in the sleeve and engaging the first and second seal to define first and second chambers in the bore. An input means is responsive to an input force for moving the first and second cylindrical members past a first and second seals to interrupt communication between the reservoir and the bore through the definite flow paths to allow further movement of the first and second cylindrical members to pressurize the fluid in the first and second chambers and thereby supply the fluid pressure responsive devices with operational fluid through the first and second outlet ports.
A return spring arrangement is provided in a specific embodiment of the invention, and when the input force terminates, the first and second cylindrical members are moved toward a rest position to allow free communication between the first and second chambers through the compensator port to the reservoir. To assure such free communication, the first and second seals have a plurality of ~,rooves on tlle externaL
surfaces thereof and the flrst and second pl;tolls have a corresponding plural:Lty of fluted surfaces to estcLblish a positive flo~7 path through which fluLd ls communlcated to tm/(~ ~
$~
the first and second chambers.
It is therefore an object oF this invention to provide a master cylinder having a die cast surface with a piston arrangement to pressuri~e the fluid therein in response to an operator input force.
In one emodiment of the invention, the master cylinder has a tapered operational bore therein with a piston arrangement through which fluid is pressurized and supplied to a fluid pressure responsive dev:ice~
These and other objects should be apparent from reading this specification and viewing the drawings.
~RIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic illustration of a brake system having a sectional view of a master cylinder made according to the principles of this invention;
Figure 2 is an e~ploded perspective view of the piston assembly of the master cylinder of Figure l;
` Figure 3 is a sectional view of circumscribed line 3 of Figure 1 showing the relationship between the sleeve, lip seal, primary piston and tm/~ 3a-..'~sJ
., ~ _ bearing member of the piston assembly in a released position;' Figure 4 is a sectional ~iew taken along line 4-4 of Figure 3; and Figure 5 is a sectional view of circurrlscribed line 3 of Figure 1 showing the relationship between the sleeve, lip seal, primary piston and bearing member of the piston assembly in an operational position.
DE L~D ~s~R P~ ~ CF THE INVE NTION
In the brake sys~em 10 shown in Figure 1, a master cylinder 12 i5 connected to the front wheel brakes 14 and the rear wheel brakes 16 by conduits 18 and 20 respectively. In response to an operational inpu~
lQ applied from brake pedal 22 through push rod 24, the rnaster cylinder 12 is operated to effect a brake application.
In more part;cular detail, the master cylinder 12 has a die cas.
houstng 26 with a bore 28 located therein. 80re 28 has a series of steps 30, 32, 34, 36 and 38 which have a slope or taper of about 1 with respect to an axîal plane through bore 28. Suçh a slope or taper is placed in the housing during die casting and is necessary to permit the removal of a die cast core after the metal in the housing 26 has cooled from a molten condition.
The housing 26 has a first compensator port 40 and a second compensator port 42 through which bore 28 is connected with compartments 44 and 46, respectively, in the fluid reservoir.
A piston assembly 48 which is located Tn bore 28 has a first piston 52 and a second piston 54, As shown in FIgure 2, the second piston 54 has a cylindrical body 60 with a first diameter and a second diameter. The cylindrlcal body 60 has a bore 62 which extends through the first diameter and into the second diameter. A series of openings 64, 64~, 64", and 64"', connects tne bore 62 with bore 28. A retainer 55 located 1n bore 62 has a stem 66 att2ched to piston 52 for ca3ing spring 58 and thereby inttially establish a distance between pistons 5~ and 54 to establish the size of a first pressure chamber 56 in bore 28.
Piston 54 has an outwardly proje-:tlng lip 70 which engages one end of spring 59 to hold the second piston 54 away from the bo~tGm of bore 2 and establish the size of a second pressurizing chamber 72.
A sleeve member 74 has a first end 76 that engages shoulder 78 to locate a second end 80 adjacent compensator port 42 and a lip seal 115 in step 32 of bore 28 to control communication of fluid between chambers 46 and 72. Slee\~e member 74 has a shoulder 82 that locates 0-ring seal 84 against shoulder 86 to preven~ fluid communication from chamber 56 between steps 32 and 34 of bore 28 and a shoulder 88 that positions 0-ring seal 90 against shoulder 92 to prevent fluid communication from chamber 56 between steps 34 ~nd 36.
Similarly, an 0-ring seal 94 located adjacent rib 96 of the sleeve member 74 by spring retainer 98, engages the cylindrical body 60 of piston 54 to prevent fluid communication between chambers 56 and 72.
As illustrated in Figures 1 and 2, sleeve member 74 has a leg 100 ~ that aligns its cylindrical body 102 within bore 28 to compensate for the taper or slope in step 34 between the first and second compensator ports 40 and 42. Lip 70 engages the interior surface 104 and cylindrical body 102 engages bearing surface 106 of rib 96 to align or centrally position piston 54 in step 32 of bore 28.
A bearing member 110 which surrounds the cylindrical body of piston 52 engages end 76 of sleeve 74 to position a-lip seal 114 adjacenc leg 100 and align passages 112 with compensator port 40 and groove 113 in bearin~ 110, A
seal 116 located in groove 118 o~ the bearing member 110 prevents fluid com-munication from compensator port 40 to the surrounding environment along step 38 of bore 28.
A snap ring or other fastener 140 engages bearing member 110 to hold the piston assembly 48 within the bore 28.
To assure that bore 28 is communicated with the reservoir, lip sea1s 114 and 115 and pistons 52 and 54 cooperate to deflne posltive fiow paths, as shown in F1gures 3 and 4, between chamber 56 and compartrl.en~ 42 and chamber 72 and compartment 46, respectively.
Lip seals 114 and 115 are ident;cal with except:Lon of size and thus th~ speciE:ic details shown ~it'h respect to lip seal 114 in ~igures 3 and 4 are e~lually applicable to lip seal 115.
Lip seal 114 has an annular base with le~s 122 and 124 attached thereto. A series oE radial grooves 126, only one being shown in Figures 3 and 4, which are located on the back side 128 of the base 120 provide a flow path from groove 113 in bearing 110 to the cylindrical surface 130 of piston 52. ~ groove 132 on the peripheral surface 134 of leg 122 ~ connects the radial grooves 126 with a series of ~luted '~ grooves 136 on the end of the cylindrical surface 130 to deEine a positive flow path between compartment 44 into - chamber 56 to maintain the fluid therein in completely filled condition.
cover member 140 having a cap 242 and a diaphragm 244 is attached to housing 260. ~he diaphragm 244 has a ~:
first bead 146 on its peripheral surface and a second bead 148 which separates the diaphragm 244 into two sections, 152 and 154. A first groove 156 is located in the first section 152 and a second groove 158 is located in the second section 154. The cap 242 has ribs 16~ and 162 thereon which are located in grooves 256 and 158 to resiliently bias the diaphram 144 toward walls 164, 166 and 168 and attach the cover member 140 to the housing 26 and thereby seal compartments 44 and 46 from the surrounding environment.
MODE OF OP~R~TIO_ _F Tlll~, VRN'L''LON
When an operator desLres to make a br~ke npplication in a veh:Lcl.e e~lll:i.pped with n brclke systelll ns shown in Figure 1, an irlpl~t ~orce appl.lcd to pad 23 ca~ses pedal 22 to move in an arc about pin 25 and provide pnsh - tm/~ 6~
rod 24 with a linear input. This l:lnear input s-imultaneously moves the fluted grooves 136 and 137 on pistons 52 and 54 past grooves 132 and 133 as return spring 59 is overcome to interrupt communication between chambers 56 and 72 and compartments 44 and 46, respectively. Movement of pistons 52 and 54 into chambers 56 and 72 causes a f].uid pressure to proportionally tml~ 6a-, ~ ~
increase -therein and supply ~heel brakes 14 and 16 wi~h fluid pressure to effect a brake applicativn.
As shown in Figure 5, ~he lip seal 114 remains stationary as piston 52 m~ves into chamber 56 to pressurize the fluid therein. The fluid pressure in chamber 56 acts on lip seal 114 to hold leg 124 against sleeve 74, surface 128 against bearing 110 and surface 134 of leg 122 against the cylindrical surface 130 of piston 52 to pre~er,t fluid communication to compartment 44 of the reservoir.
Upon termination of the input force on pedal 22, return spring 59 acts on the second piston 54 and moves the first and second pistons S2 and 54 toward stop 140. As tips 142 and 144 of fluted grooves 136 and 137 reach grooves 132 and 133, fluid communication between chambers 56 and 72 and reservoir compartment 44 and 46 is initiated through a defined flow pa~h established by grooves 126 to assure tha~ any fluid which could be lost from the brake system is replenished prior to another application of input brake force by an operator.
Claims (22)
1. A master cylinder comprising:
a housing having a tapered bore therein, said housing having first and second compensator ports for connecting said tapered bore to a fluid reservoir and first and second outlet ports connected to fluid pres-sure responsive devices;
a sleeve member located in said tapered bore;
first and second seals associated with said sleeve member;
piston means engaging said First and second seals and cooperat-ing with said housing to define first and second chambers adjacent said first and second outlet ports respectively;
bearing means surrounding at least a portion of said piston means and engaging said sleeve member to hold said first and second seals in a stationary position within said bore; and input means responsive to an input Force for moving said piston means past said seals to interrupt communication between the reservoir and the bore and pressurizing the fluid in said first and second chambers to supply the fluid pressure responsive devices with an operational fluid pressure through said First and second outlet ports.
a housing having a tapered bore therein, said housing having first and second compensator ports for connecting said tapered bore to a fluid reservoir and first and second outlet ports connected to fluid pres-sure responsive devices;
a sleeve member located in said tapered bore;
first and second seals associated with said sleeve member;
piston means engaging said First and second seals and cooperat-ing with said housing to define first and second chambers adjacent said first and second outlet ports respectively;
bearing means surrounding at least a portion of said piston means and engaging said sleeve member to hold said first and second seals in a stationary position within said bore; and input means responsive to an input Force for moving said piston means past said seals to interrupt communication between the reservoir and the bore and pressurizing the fluid in said first and second chambers to supply the fluid pressure responsive devices with an operational fluid pressure through said First and second outlet ports.
2. The master cylinder, as recited In claim 1, wherein said sleeve member includes:
a plurality of openings through which the fluid in the first chamber is communicated to said first outlet port.
a plurality of openings through which the fluid in the first chamber is communicated to said first outlet port.
3. The master cylinder as recited in claim 2, wherein said piston means includes:
a First cylindrical member located in said tapered bore by said bearing means; and second cylindrical member located in said tapered bore by a lip on said sleeve member.
a First cylindrical member located in said tapered bore by said bearing means; and second cylindrical member located in said tapered bore by a lip on said sleeve member.
4. The master cylinder, as recited in claim 3 further including:
a first spring located between said first and second cylindrical members to establish the size of said first chamber; and a second spring located between said second cylindrical member and said sleeve member for urging said first and second cylindrical member out of said first and second chambers toward a rest position.
a first spring located between said first and second cylindrical members to establish the size of said first chamber; and a second spring located between said second cylindrical member and said sleeve member for urging said first and second cylindrical member out of said first and second chambers toward a rest position.
5. The master cylinder, as recited in claim 4, wherein said first and second seals each include:
a plurality of radial grooves for establishing a definite flow path between the reservoir and the bore.
a plurality of radial grooves for establishing a definite flow path between the reservoir and the bore.
6. The master cylinder, as recited in claim 5, wherein said first and second cylindrical members each include:
a fluted section located on the end thereof for defining an ex-tension between said definite flow path and the first and second chambers.
a fluted section located on the end thereof for defining an ex-tension between said definite flow path and the first and second chambers.
7. The master cylinder, as recited in claim 6, wherein said second cylindrical body includes:
a first diameter section and a second diameter section, said first diameter section having a lip on the peripheral surface thereof for engaging said second spring, said lip engaging said sleeve member to maintain the first diameter section in substantially the center of said bore in said second chamber.
a first diameter section and a second diameter section, said first diameter section having a lip on the peripheral surface thereof for engaging said second spring, said lip engaging said sleeve member to maintain the first diameter section in substantially the center of said bore in said second chamber.
8. The master cylinder, as recited in claim 7, wherein said second cylindrical body further includes:
a second bore that extends through said first diameter section and into said second diameter section, said first spring being located in said second bore and said first cylindrical member telescoping into said second bore to provide a compact unitary structure.
a second bore that extends through said first diameter section and into said second diameter section, said first spring being located in said second bore and said first cylindrical member telescoping into said second bore to provide a compact unitary structure.
9. The master cylinder, as recited in claim 8, wherein said second cylindrical body further includes:
a plurality of openings located in said first diameter section to allow fluid to freely flow between the second bore and the first chamber with relative movement between the first and second cylindrical members.
a plurality of openings located in said first diameter section to allow fluid to freely flow between the second bore and the first chamber with relative movement between the first and second cylindrical members.
10. The master cylinder, as recited in claim 9, further including:
a wall for separating the reservoir into first and second com-partsments;
a diaphragm having a first bead on its peripheral surface and a second bead, said first and second beads having grooves thereon; and cover means having first and second ribs thereon located in said grooves for biasing said first and second beads against said housing and wall to seal said first and second chambers from the surrounding environment,
a wall for separating the reservoir into first and second com-partsments;
a diaphragm having a first bead on its peripheral surface and a second bead, said first and second beads having grooves thereon; and cover means having first and second ribs thereon located in said grooves for biasing said first and second beads against said housing and wall to seal said first and second chambers from the surrounding environment,
11. A master cylinder comprising:
a housing having a stepped bore therein, said housing having first and second inlet ports for connecting said stepped bore to a reservoir and first and second outlet ports;
a sleeve located in said stepped bore;
first and second seals positioned in said stepped bore adjacent said first and second inlet ports;
bearing means engaging said sleeve to hold said first and second seals in a stationary position within said stepped bore;
passage means between said first and second seals and bearing means for defining definite flow paths between the compensator ports and the stepped bore;
piston means having first and second cylindrical members located in said sleeve and engaging said first and second seals to define first and second chambers in the stepped bore, said second cylindrical member having a first diameter section and a second diameter section, said first diameter section engaging said sleeve to hold said second diameter section in substantially the axial center of the stepped bore in the second chamber; and input means responsive to an input force for moving the first and second cylindrical members past said first and second seals to interrupt communication between the reservoir and the stepped bore through said definite flow paths to allow further movement of the first and second cylindrical members to pressurize the fluid in the first and second chambers and thereby supply the fluid pressure responsive devices with operational fluid through said first and second outlet ports.
a housing having a stepped bore therein, said housing having first and second inlet ports for connecting said stepped bore to a reservoir and first and second outlet ports;
a sleeve located in said stepped bore;
first and second seals positioned in said stepped bore adjacent said first and second inlet ports;
bearing means engaging said sleeve to hold said first and second seals in a stationary position within said stepped bore;
passage means between said first and second seals and bearing means for defining definite flow paths between the compensator ports and the stepped bore;
piston means having first and second cylindrical members located in said sleeve and engaging said first and second seals to define first and second chambers in the stepped bore, said second cylindrical member having a first diameter section and a second diameter section, said first diameter section engaging said sleeve to hold said second diameter section in substantially the axial center of the stepped bore in the second chamber; and input means responsive to an input force for moving the first and second cylindrical members past said first and second seals to interrupt communication between the reservoir and the stepped bore through said definite flow paths to allow further movement of the first and second cylindrical members to pressurize the fluid in the first and second chambers and thereby supply the fluid pressure responsive devices with operational fluid through said first and second outlet ports.
12. The master cylinder, as recited in claim 11 further including:
a first spring located between said first and second cylindrical member to establish the size of said first chamber; and a second spring located between said sleeve member and the first diameter section of said second cylindrical member for urging said first and second members out of the first and second chambers toward a rest position.
a first spring located between said first and second cylindrical member to establish the size of said first chamber; and a second spring located between said sleeve member and the first diameter section of said second cylindrical member for urging said first and second members out of the first and second chambers toward a rest position.
13. The master cylinder, as recited in claim 12 wherein said first and second cylindrical members each include:
a fluted section located on the end of said first and second cylindrical members for defining an extension between said definite flow path and the first and second chambers.
a fluted section located on the end of said first and second cylindrical members for defining an extension between said definite flow path and the first and second chambers.
14. The master cylinder as recited in claim 13 wherein said second cylindrical member further includes:
a second bore that extends through said first diameter section and into said second diameter section, said first spring being located in said second bore and said first cylindrical member telescoping into said second bore to provide a compact unitary structure.
a second bore that extends through said first diameter section and into said second diameter section, said first spring being located in said second bore and said first cylindrical member telescoping into said second bore to provide a compact unitary structure.
15. The master cylinder, as recited in claim 14 wherein said second cylindrical body further includes:
a plurality of openings located in said first diameter section to allow fluid to freely flow between the second bore and the first chamber with relative movement between the first and second cylindrical members.
a plurality of openings located in said first diameter section to allow fluid to freely flow between the second bore and the first chamber with relative movement between the first and second cylindrical members.
16. A master cylinder comprising:
a housing having a bore therein, said housing having first and second inlet ports for connecting said bore to reservoir and first and second outlet ports;
a sleeve located in said bore;
first and second seals positioned adjacent said first and second inlet ports, respectively, each of said first and second seals having passages to define definite flow paths between the first and second inlet ports and the bore;
bearing means engaging said sleeve to hold said first and second seals in a stationary position within said bore;
piston means having first and second cylindrical members located in said sleeve and engaging said first and second seals to define first and second chambers in the bore; and input means responsive to an input force for moving the first and second cylindrical members past said first and second seals to interrupt communication between the reservoir and the bore through said definite flow paths to allow further movement of the first and second cylindrical members to pressurize the fluid in the first and second chambers and thereby supply the fluid pressure responsive devices with operational fluid through said first and second outlet ports.
a housing having a bore therein, said housing having first and second inlet ports for connecting said bore to reservoir and first and second outlet ports;
a sleeve located in said bore;
first and second seals positioned adjacent said first and second inlet ports, respectively, each of said first and second seals having passages to define definite flow paths between the first and second inlet ports and the bore;
bearing means engaging said sleeve to hold said first and second seals in a stationary position within said bore;
piston means having first and second cylindrical members located in said sleeve and engaging said first and second seals to define first and second chambers in the bore; and input means responsive to an input force for moving the first and second cylindrical members past said first and second seals to interrupt communication between the reservoir and the bore through said definite flow paths to allow further movement of the first and second cylindrical members to pressurize the fluid in the first and second chambers and thereby supply the fluid pressure responsive devices with operational fluid through said first and second outlet ports.
17. The master cylinder as recited in claim 16 wherein said bearing means includes:
a disc member that surrounds and engages the first cylindrical member of the piston means; and a first surface on said sleeve that surrounds and engages the second cylindrical member of the piston means, said disc member and said surface maintaining said piston means in substantially the axial center of the bore.
a disc member that surrounds and engages the first cylindrical member of the piston means; and a first surface on said sleeve that surrounds and engages the second cylindrical member of the piston means, said disc member and said surface maintaining said piston means in substantially the axial center of the bore.
18. The master cylinder, as recited in claim 17 further including:
a first spring located between said first and second cylindrical members to establish the size of said first chamber; and a second spring connected to the second cylindrical member for urging the piston means toward a rest position.
a first spring located between said first and second cylindrical members to establish the size of said first chamber; and a second spring connected to the second cylindrical member for urging the piston means toward a rest position.
19. The master cylinder, as recited in claim 18 wherein said first and second cylindrical members each include:
passages for defining an extension for the definite flow path to assure free communication of fluid from the reservoir with the piston means in the rest position.
passages for defining an extension for the definite flow path to assure free communication of fluid from the reservoir with the piston means in the rest position.
20. The master cylinder, as recited in claim 19 wherein said second cylindrical member further includes:
a first diameter section and a second diameter section, said first diameter section engaging said first surface on said sleeve, said second diameter section engaging a second surface on said sleeve, said second cylindrical member having a second bore, said first spring being located in said second bore and said first cylindrical member telescoping into said second bore to provide a unitary structure.
a first diameter section and a second diameter section, said first diameter section engaging said first surface on said sleeve, said second diameter section engaging a second surface on said sleeve, said second cylindrical member having a second bore, said first spring being located in said second bore and said first cylindrical member telescoping into said second bore to provide a unitary structure.
21. The master cylinder, as recited in claim 20 wherein said second spring is located between a shoulder formed by the first and second surfaces on the sleeve and the second diameter surface on the second cylindrical member, said first spring, second cylindrical member find second spring being concentric to said sleeve.
22. The master cylinder as recited in claim 21 wherein said second cylindrical member has a plurality of openings therein to allow fluid to flow between the second bore and the first chamber on relative movement between the first and second cylindrical members.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US89075778A | 1978-03-27 | 1978-03-27 | |
| US890,757 | 1992-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1112268A true CA1112268A (en) | 1981-11-10 |
Family
ID=25397110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA322,538A Expired CA1112268A (en) | 1978-03-27 | 1979-03-01 | Master cylinder |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS54145870A (en) |
| AU (1) | AU518546B2 (en) |
| CA (1) | CA1112268A (en) |
| DE (1) | DE2910137A1 (en) |
| ES (1) | ES478978A1 (en) |
| FR (1) | FR2421090A1 (en) |
| GB (1) | GB2017240B (en) |
| IT (1) | IT1111226B (en) |
| MX (1) | MX148339A (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2472681A1 (en) * | 1979-12-03 | 1981-07-03 | Dba | HYDRAULIC PRESSURE GENERATOR |
| US4329846A (en) * | 1980-03-17 | 1982-05-18 | The Bendix Corporation | Fast fill displacement master cylinder |
| ES494697A0 (en) * | 1980-07-30 | 1981-03-16 | Bendiberica Sa | IMPROVEMENTS IN MASTER CYLINDERS FOR HYDRAULIC VEHICLE BRAKE INSTALLATIONS |
| US4414811A (en) * | 1981-02-19 | 1983-11-15 | The Bendix Corporation | Master cylinder |
| CA1194523A (en) * | 1981-06-04 | 1985-10-01 | Robert F. Gaiser | Master cylinder |
| US4510752A (en) * | 1981-07-10 | 1985-04-16 | The Bendix Corporation | Master cylinder |
| US4455830A (en) * | 1981-09-02 | 1984-06-26 | The Bendix Corporation | Master cylinder |
| US4771605A (en) * | 1981-12-27 | 1988-09-20 | Allied Corporation | Reinforced master cylinder with integrally molded cylinder liner and reservoir |
| US4474005A (en) * | 1982-08-26 | 1984-10-02 | The Bendix Corporation | Master cylinder |
| DE3305442A1 (en) * | 1983-02-17 | 1984-08-23 | Alfred Teves Gmbh, 6000 Frankfurt | MAIN CYLINDER FOR HYDRAULIC BRAKE SYSTEMS OF MOTOR VEHICLES |
| DE3312192A1 (en) * | 1983-04-02 | 1984-10-04 | Alfred Teves Gmbh, 6000 Frankfurt | MAIN CYLINDER |
| DE3325424A1 (en) * | 1983-07-14 | 1985-01-24 | Alfred Teves Gmbh, 6000 Frankfurt | ACTUATING DEVICE FOR A HYDRAULIC MOTOR VEHICLE BRAKE SYSTEM |
| FR2561320B1 (en) * | 1984-03-19 | 1986-09-19 | Wabco Freinage Vehicules Sa | HYDRAULIC PRESSURE TRANSMITTER AND ITS RING SEAL |
| DE3506203A1 (en) * | 1985-02-22 | 1986-08-28 | FAG Kugelfischer Georg Schäfer KGaA, 8720 Schweinfurt | Master cylinder, especially for hydraulic actuating device on motor vehicles |
| US4745751A (en) * | 1987-02-03 | 1988-05-24 | Allied Corporation | Master cylinder with fast fill valving mechanism |
| US5074197A (en) * | 1989-02-23 | 1991-12-24 | Jidosha Kiki Co., Ltd. | Master cylinder with micro-sized grooves in piston guide |
| DE3905917A1 (en) * | 1989-02-25 | 1990-08-30 | Teves Gmbh Alfred | TANDEM MAIN CYLINDERS FOR HYDRAULIC BRAKE SYSTEMS |
| GB2266752A (en) * | 1992-05-08 | 1993-11-10 | Lucas Ind Plc | Master cylinder |
| US5524736A (en) * | 1995-03-03 | 1996-06-11 | Korshak; Maurice J. | Master cylinder bleeding |
| US6581380B2 (en) | 2001-07-16 | 2003-06-24 | Automotive Products (Usa), Inc. | Master cylinder with improved piston guidance |
| US6550246B2 (en) | 2001-07-16 | 2003-04-22 | Automotive Products (Usa), Inc. | Master cylinder with extended piston |
| DE10212539A1 (en) | 2002-03-20 | 2003-10-23 | Continental Teves Ag & Co Ohg | Piston unit with shackled spring |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB501312A (en) * | 1937-03-31 | 1939-02-24 | Gen Motors Corp | Improvements in hydraulic operating systems |
| FR850020A (en) * | 1939-02-08 | 1939-12-06 | Improvements in the construction of control cylinders for hydraulic transmissions for vehicle brakes | |
| FR921176A (en) * | 1946-11-29 | 1947-04-29 | Control cylinder for brake or other hydraulic device | |
| US2531705A (en) * | 1947-03-12 | 1950-11-28 | Bendix Aviat Corp | Master and receiver cylinder construction |
| US2759329A (en) * | 1952-05-19 | 1956-08-21 | Joseph V Ponti | Master cylinder pressure cartridge unit |
| US3030777A (en) * | 1954-09-22 | 1962-04-24 | Springmeier Edward Henry | Master hydraulic cylinder construction |
| DE1177955B (en) * | 1961-03-18 | 1964-09-10 | Georg Giebler | Master brake cylinder made of plastic with metallic reinforcement for the cylinder raceway for motor vehicles |
| GB975477A (en) * | 1962-11-01 | 1964-11-18 | Ford Motor Co | Clutch or brake master cylinder assembly |
| US3416315A (en) * | 1967-04-10 | 1968-12-17 | Bendix Corp | Brake system failure warning device |
| JPS503906U (en) * | 1973-05-11 | 1975-01-16 | ||
| GB1455316A (en) * | 1974-04-08 | 1976-11-10 | Automotive Prod Co Ltd | Liquid pressure master cylinders |
| JPS50153383U (en) * | 1974-06-10 | 1975-12-19 | ||
| GB1481612A (en) * | 1975-04-07 | 1977-08-03 | Automotive Prod Co Ltd | Liquid pressure master cylinders |
| GB1539879A (en) * | 1975-04-14 | 1979-02-07 | Automotive Prod Co Ltd | Liquid pressure apparatus |
| JPS5219115U (en) * | 1975-07-30 | 1977-02-10 | ||
| JPS5819498B2 (en) * | 1975-12-23 | 1983-04-18 | アイシンセイキ カブシキガイシヤ | Master cylinder reservoir cap |
-
1979
- 1979-03-01 CA CA322,538A patent/CA1112268A/en not_active Expired
- 1979-03-12 GB GB7908593A patent/GB2017240B/en not_active Expired
- 1979-03-15 DE DE19792910137 patent/DE2910137A1/en active Granted
- 1979-03-16 AU AU45174/79A patent/AU518546B2/en not_active Expired
- 1979-03-26 MX MX177050A patent/MX148339A/en unknown
- 1979-03-26 IT IT7921279A patent/IT1111226B/en active
- 1979-03-27 JP JP3517579A patent/JPS54145870A/en active Granted
- 1979-03-27 ES ES478978A patent/ES478978A1/en not_active Expired
- 1979-03-27 FR FR7907641A patent/FR2421090A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2421090A1 (en) | 1979-10-26 |
| ES478978A1 (en) | 1979-11-16 |
| AU4517479A (en) | 1979-10-04 |
| FR2421090B1 (en) | 1984-09-14 |
| IT7921279A0 (en) | 1979-03-26 |
| DE2910137C2 (en) | 1988-08-25 |
| AU518546B2 (en) | 1981-10-08 |
| JPS54145870A (en) | 1979-11-14 |
| MX148339A (en) | 1983-04-13 |
| IT1111226B (en) | 1986-01-13 |
| GB2017240B (en) | 1982-07-21 |
| DE2910137A1 (en) | 1979-10-11 |
| GB2017240A (en) | 1979-10-03 |
| JPS6233977B2 (en) | 1987-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |