US20050092170A1 - A tandem brake booster - Google Patents
A tandem brake booster Download PDFInfo
- Publication number
- US20050092170A1 US20050092170A1 US10/605,847 US60584703A US2005092170A1 US 20050092170 A1 US20050092170 A1 US 20050092170A1 US 60584703 A US60584703 A US 60584703A US 2005092170 A1 US2005092170 A1 US 2005092170A1
- Authority
- US
- United States
- Prior art keywords
- flange
- cylindrical body
- partition member
- chambers
- brake booster
- 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.)
- Granted
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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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
- B60T13/563—Vacuum systems indirect, i.e. vacuum booster units with multiple booster units, e.g. tandem booster units
-
- 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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
- B60T13/569—Vacuum systems indirect, i.e. vacuum booster units characterised by piston details, e.g. construction, mounting of diaphragm
Definitions
- the first bead 102 on the second diaphragm assembly is joined to the partition member 34 by pushing the annular end face 78 on cylindrical body 72 into annular groove 106 such that the annular lip 108 extends toward the flange 76 .
- the length of the annular lip 108 is such that an annular groove 79 is formed between the end of the annular lip 108 and flange 76 .
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
Abstract
A tandem brake booster has a housing defined by a front shell that is joined to a rear shell to create an interior cavity. The interior cavity is divided by first and second diaphragm assemblies that are separated by a partition member to respectively isolate a first chamber from a second chamber and a third chamber from a fourth chamber. The first and third chambers are connected to fluid having a substantially constantly first pressure while the second and fourth chambers are connected to selectively receive the fluid at the first pressure or fluid at a second pressure. The partition member is characterized by a disc with a cylindrical body extending from a ledge formed on a peripheral surface of the disc and a flange located on the cylindrical body between the ledge and an end face of the cylindrical body.
Description
- This invention relates to a partition member for dividing an internal cavity within a housing of a brake booster into a plurality of operational chambers wherein the partition member is fixed within the internal cavity and as a result the size of a flow path between a portion of the chamber is substantially un-effected during a brake application.
- In the development of brake boosters it became evident that by dividing the interior cavity of a housing by two diaphragm members a resultant output force could be significantly increased. In some of the resulting tandem brake boosters the communication between the chambers is achieved through passages in a hub that retains a control valve that is responsive to an operator input while in other tandem brake boosters such as disclosed in U.S. Pat. Nos. 3,083,698; 3,517,588 and 3,760,693 wherein the rear chambers are connected to each other through flow path created between a peripheral surface of a partition member and housing. The partition member is usually made of a plastic material and connected to the two diaphragm members. In some of such boosters, the partition member may move or float within the interior cavity as a function of a pressure differential developed during a brake application. This floating movement may adversely effect the ultimate development of an output force by a brake booster.
- It is a primary object of this invention to provide a brake booster with a partition member that is located in a fixed location within interior cavity of a housing to separate first and second chambers from second and third chambers while defining a flow path between various chambers within the interior cavity.
- In more particular detail, the brake booster according to the present invention has a housing that is formed by a front shell that is joined to a rear shell to create an interior cavity. The interior cavity is divided by a first diaphragm assembly into first and second chambers and by a second diaphragm assembly into third and fourth chambers with the second and third chamber are separated from each other by a partition member. The first and third chambers are connected to each other and constantly receive a fluid having a first pressure (vacuum) while the second and fourth chambers are connected to receive the fluid having the first pressure (vacuum) or fluid having a second pressure (atmospheric pressure). A valve located in a hub of the second diaphragm assembly selectively controls the communication of fluid at the second pressures to the second and fourth chambers to create a pressure differential across the first and second diaphragm assemblies with the first fluid in the first and third chambers to develop an output force. The output force acts on a master cylinder to pressurize fluid and effect a brake application. The partition member is characterized by a disc with a cylindrical body that extends from a ledge formed on a peripheral surface and a flange located on the cylindrical body between the ledge and an end face of the cylindrical body. The flange is formed with alternate radial sections and ramped sections such that when the front shell is joined with the rear shell a bead on the first diaphragm assembly is compressed between the ledge and the first shell to define a reaction force that acts on and urges the radial sections into engagement with said rear shell to fix the located of the partition member within the interior cavity while the ramped sections define a portion of an unrestricted flow path for communication of fluid between the second and fourth chambers.
- An advantage of this invention resides in a partition member that axially fixes first and second diaphragm assemblies within an internal cavity of a housing to create the first, second, third and fourth chambers therein.
- It is an object of this invention to axially fix a partition member within a housing by urging a flange on the partition member into engagement with a rear shell through a reaction force developed by compressing a bead on a first diaphragm between the rear shell and a front shell of the housing.
- It is an object of this invention to provide a tandem brake booster with a partition member whereby unrestricted fluid communication between the rear chambers occurs through a flow path located between a peripheral surface on the partition and the rear shell.
-
FIG. 1 is a schematic illustration of a brake booster having a partition member made according to the present invention; -
FIG. 2 is a side plan view of the partition member ofFIG. 1 ; -
FIG. 3 is an enlarged front perspective view of a section of the brake booster showing a relationship between beads on first and second diaphragms, the front and rear shell and the partition member ofFIG. 1 ; and -
FIG. 4 is an enlarged rear perspective view showing a relationship of the beads of the first and second beads and the partition member ofFIG. 3 . - A
tandem brake booster 10 illustrated inFIG. 1 is made according to the present invention and is defined by ahousing 11.Housing 11 is constructed afront shell 12 that is joined to arear shell 14 by rolling alip 16 on therear shell 14 over anannular flange 18 on thefront shell 12 to create a unitary structure of a type illustrated in U.S. Pat. No. 6,390,567. In joining thefront shell 12 to therear shell 14, an interior cavity 20 is created that is separated into afirst chamber 22 and asecond chamber 24 by afirst diaphragm assembly 26 and into athird chamber 28 and afourth chamber 30 by asecond diaphragm assembly 32. Thesecond chamber 24 is separated from thethird chamber 28 by apartition member 34 that engages therear shell 14 and ahub 36 that extends through the first 26 and second 32 diaphragm assemblies. Thehub 36 has a steppedinternal bore 38 that receives acontrol valve 40 that is connected to a brake pedal. Thehub 36 has aradial opening 42 therein through whichbore 38 connects thefirst chamber 22 to thethird chamber 28, apassage 44 through which thefirst chamber 22 is connected to anannular vacuum seat 46 inbore 38, apassage 48 through which thebore 38 adjacent thevacuum seat 44 is connected to thefourth chamber 30. Thecontrol valve 40 that is located inbore 38 includes aplunger 52 and apoppet member 54. Thepoppet member 54 has a first end that is fixed to thehub 36 and a flexibleannular face 56 that is urged towardvalve seat 46 by afirst spring 59 retained on apush rod 60 connected to the brake pedal. in addition, asecond spring 62 acts on thepush rod 60 to urge theplunger 52 toward anatmospheric seat 58 onface 56 of thepoppet member 54. - In response to an input force applied by an operator to brake pedal,
push rod 60 moves such thatspring 59urges face 56 into engagement withvacuum seat 46 to interrupt normally opened communication throughpassage 44 and thereafter movesplunger 52 away fromseat 58 to allow air from the surrounding environment to be communicated frombore 38 topassage 48 for initial distribution tochamber 30 and thereafter by way offlow path 64 formed adjacent the peripheral of the interior cavity 20 tochamber 24. The air supplied tochambers chambers hub 36 and after overcomingreturn spring 63 provides push rod 66 with an operational force to pressurize fluid in a master cylinder (not shown) to effect a brake application. - In more particular detail, the
partition member 34, as best shown inFIGS. 2 and 3 , is characterized by adisc 70 with acylindrical body 72 that extending from aledge 74 formed on a peripheral surface of thedisc 70 and aflange 76 located on thecylindrical body 72 between theledge 74 and anannular end face 78 of thecylindrical body 72. Theflange 76 is formed with alternateradial sections sections radial section 80 is such that when aperipheral surface 81 of aradial sections 80 engages thecylindrical body 100 on rear shell and withseal 84 located on theperipheral surface 37, thehub 36 the axis ofbore 38 is a center of thehousing 11. Theflange 76 is shown as being continuous and provides a smooth flow path for the communication of air betweenchambers partition member 34 could be formed without theradial sections sections transition bridges face 83 associated with eachradial flange ledge 74 is set and controls the location of thepartition member 36 within the interior cavity 20 as a function of a reaction force created by compressingbead 90 of thefirst diaphragm assembly 26. - The
first diaphragm assembly 26 includes adiaphragm 92 with afirst bead 90 and asecond bead 94 and a backing plate 96. Thesecond bead 94 is located in afirst groove 39 onhub 36 to hold backing plate 96 in engagement withshoulder 41 onhub 36 while thefirst bead 90 is retained onledge 74 to separate and seal thefirst chamber 22 from thesecond chamber 24.Bead 90 has a first thickness “t1” and a first plurality ofpassages bead 90 such that whenbead 90 is compressed betweenledge 74 andradial flange 18 on thefront shell 12 air may freely flow inflow path 64. - The
second diaphragm assembly 30 includes adiaphragm 103 withfirst bead 102 and asecond bead 104 and abacking plate 106. Thesecond bead 104 is located in asecond groove 39′ on thehub 36 to holdbacking plate 104 in engagement withshoulder 41′ onhub 36. Thefirst bead 102 has a second thickness “t2” with anannular groove 106 that receiving theannular end face 78 oncylindrical body 72 of thepartition member 36 andannular lip 108 that extends fromface 110.Bead 102 has a plurality ofslots face 110 to theend 114 of theannular lip 108 to form a second plurality of passages or channels inflow path 64 for air to flow when thesecond diaphragm assembly 30 is installed in therear shell 14. - The
rear shell 14 is defined by a generally secondcylindrical body 100 that extends from aradial disc 17 through which thehub 36 extends. Thecylindrical body 100 has afirst diameter section 116 that extends fromannular end 118 and is separated from asecond diameter section 120 by afirst shoulder 122 while thesecond diameter section 120 is separated from athird diameter section 124 by asecond shoulder 126. - The unitary brake booster is manufactured by placing the
first diaphragm assembly 26 onhub 36 such that thesecond bead 94 is located in afirst groove 39 to hold backing plate 96 in engagement withshoulder 41. Thepartition member 34 is added to thehub 36 by locatingseal 84 onperipheral surface 37 ofhub 36 andbead 90 onledge 74. Thebacking plate 106 is placed onhub 36 andbead 104 of thesecond diaphragm assembly 30 located ingroove 39′ on thehub 36 to holdbacking plate 104 in engagement withshoulder 41′ onhub 36. Thefirst bead 102 on the second diaphragm assembly is joined to thepartition member 34 by pushing theannular end face 78 oncylindrical body 72 intoannular groove 106 such that theannular lip 108 extends toward theflange 76. The length of theannular lip 108 is such that anannular groove 79 is formed between the end of theannular lip 108 andflange 76. When thehub 36 with the first 26 and second 30 diaphragm assemblies attached thereto is placed in the rear shell 14 a portion of the hub extends through opening 15 in therear shell 14 andface 101 onbead 102 engaging thesecond shoulder 126 while theperipheral surface 81 of theradial sections flange 76 engage thefirst diameter section 116 of the rear shell, thehub 36 is located along the axis ofhousing 11. Thefront shell 12 is placed on therear shell 14 such thatflange 18 engagesbead 90 and a compressive force is applied to compressbead 90 and bringface 83 on theradial sections flange 76 into engagement with thefirst shoulder 122 to fix the position of thepartition member 34 within cavity 20. The relatively size ofbead 90 as compared withbead 102 is such that the reaction force caused by compression ofbead 90 is greater than the reaction force caused by compression ofbead 102 and as a result theradial sections flange 76 are retained in engagement with thefirst shoulder 122. Thereafter, theannular end 118 is rolled overflange 18 to form the unitary structure. - The
flow path 64 between the second chamber 20 and thefourth chamber 30 is defined by the first plurality ofpassages bead 90, theannular space 71 betweencylindrical body 72 and thefirst diameter section 116 ofcylindrical body 100, the plurality of rampedsections flange 76, theannular groove 79 defined between the end oflip 108 andflange 76 and the plurality ofslots bead 102. The first plurality ofpassages bead 90 and second plurality of passages orslots bead 102 are uniformly spaced thereon but need not be axially aligned with the plurality of rampedsections flange 76 as theannular groove 79 and theannular space 71 provide unrestricted communication between the second 20 and thefourth chamber 30.
Claims (10)
1. In a tandem brake booster having a housing formed by a front shell that is joined to a rear shell to create an interior cavity that is divided by a first diaphragm assembly and a second diaphragm assembly and thereby isolate a first chamber from a second chamber and a third chamber from a fourth chamber, said first and second diaphragm assemblies being separated from each other by a partition member, said first and third chambers being connected to constantly receive a fluid having a first pressure while said second and fourth chambers are selectively connected to receive either the fluid having the first pressure or fluid having a second pressure as a function of the operation of valve means, said valve controls the communication of fluid at said second pressures to said second and fourth chambers to create a pressure differential across said first and second diaphragm assemblies with the first fluid in the first and third chambers to develop an output force and thereby effect a brake application, said partition member being characterized by a disc with a cylindrical body extending from a ledge formed on a peripheral surface of the disc and a flange located on said cylindrical body between said ledge and an end face of the cylindrical body, said flange being formed with alternate radial sections and ramped sections, said radial sections engaging said rear shell to located said partition member within said interior cavity while said ramped sections define a first portion of a flow path for communication of fluid between said second and fourth chambers.
2. The tandem brake booster as recited in claim 1 wherein said rear shell has a second cylindrical body with a first diameter section that is separated from a second diameter section by a first shoulder and a third diameter section that is separated from the second diameter section by a second shoulder, said radial sections of said flange engage said first shoulder in axially fixing the position of said partition member within said interior cavity.
3. The tandem brake booster as recited in claim 2 wherein said radial sections of said flange engage said first diameter of said rear shell to radially locate said partition member within said interior cavity.
4. The tandem brake booster as recited in claim 3 wherein said first diaphragm assembly is characterized by a first bead having a first thickness and being located on said ledge, said first bead having a first plurality of passages that form a second portion of said flow path between said second and fourth chambers.
5. The tandem brake booster as recited in claim 4 wherein said second diaphragm assembly is characterized by a second bead having a second thickness, a first groove for receiving said end face of said cylindrical body of said partition member and an annular lip that engages said cylindrical body and is concentrically located between said second diameter of said rear shell and said cylindrical body, and a second plurality of passages that form a third portion of said flow path between said second and fourth chambers.
6. The tandem brake booster as recited in claim 5 wherein said annular lip on said second bead extends to a location adjacent said flange such that a space is defined between said flange and an end of said lip to create an annular second groove through which said second plurality of passages are connected with said ramped section of said flange.
7. The tandem brake booster as recited in claim 6 wherein in joining said rear shell to said front shell a closure force is created that compresses said first bead between said ledge and front shell and a first reaction force develops that urges said radial sections of said flange into engagement with first shoulder on said rear shell and compresses said second bead between said end face of said cylindrical body and said second shoulder on said rear shell to develop a second reaction force in sealing said interior cavity from the surrounding environment.
8. The tandem brake booster as recited in claim 7 wherein said first reaction force is greater than said second reaction force such that said flange on said partition member always remains in contact with said first shoulder.
9. The tandem brake booster as recited in claim 8 wherein a third annular space between said cylindrical body of said partition member and said first diameter of said rear shell define a fourth portion of said flow path.
10. The tandem brake booster as recited in claim 9 wherein said first and second plurality of passages in said first and second diaphragm members are uniformly spaced thereon but need not be axially aligned with said ramp sections on said flange as said annular second groove and said third annular space provide unrestricted communication between said second and fourth chambers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/605,847 US6895853B1 (en) | 2003-10-30 | 2003-10-30 | Tandem brake booster |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/605,847 US6895853B1 (en) | 2003-10-30 | 2003-10-30 | Tandem brake booster |
Publications (2)
Publication Number | Publication Date |
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US20050092170A1 true US20050092170A1 (en) | 2005-05-05 |
US6895853B1 US6895853B1 (en) | 2005-05-24 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/605,847 Expired - Lifetime US6895853B1 (en) | 2003-10-30 | 2003-10-30 | Tandem brake booster |
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US (1) | US6895853B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007010031A1 (en) * | 2005-07-22 | 2007-01-25 | Continental Teves Ag & Co. Ohg | Pneumatic servobrake and diaphragm therefor |
WO2018104031A1 (en) * | 2016-12-08 | 2018-06-14 | Continental Teves Ag & Co. Ohg | Pneumatic brake booster having a sealing element |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3083698A (en) * | 1960-06-30 | 1963-04-02 | Bendix Corp | Fluid pressure motor construction |
US3517588A (en) * | 1968-05-29 | 1970-06-30 | Bendix Corp | Servomotor and valve means |
US3603208A (en) * | 1969-06-30 | 1971-09-07 | Bendix Corp | Servomotor having a one-piece center plate |
US3760693A (en) * | 1972-03-15 | 1973-09-25 | Bendix Corp | Tandem servomotor partition |
US3958497A (en) * | 1973-07-30 | 1976-05-25 | The Bendix Corporation | Wall means for a servomotor |
US4596178A (en) * | 1984-03-23 | 1986-06-24 | Aisin Seiki Kabushiki Kaisha | Housing assembly for tandem brake booster |
US4881451A (en) * | 1987-09-03 | 1989-11-21 | General Motors Corporation | Tandem vacuum booster and diaphram for same |
US5507216A (en) * | 1993-10-05 | 1996-04-16 | Nissin Kogyo Co., Ltd. | Tandem type vacuum booster |
US5664479A (en) * | 1994-10-27 | 1997-09-09 | Aisin Seiki Kabushiki Kaisha | Tandem vacuum booster |
US5941610A (en) * | 1996-01-31 | 1999-08-24 | Aisin Seiki Kabushiki Kaisha | Tandem vacuum servo unit for a vehicle braking system |
US6626080B2 (en) * | 2001-08-07 | 2003-09-30 | Delphi Technologies, Inc. | Triple power booster for brake systems |
-
2003
- 2003-10-30 US US10/605,847 patent/US6895853B1/en not_active Expired - Lifetime
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3083698A (en) * | 1960-06-30 | 1963-04-02 | Bendix Corp | Fluid pressure motor construction |
US3517588A (en) * | 1968-05-29 | 1970-06-30 | Bendix Corp | Servomotor and valve means |
US3603208A (en) * | 1969-06-30 | 1971-09-07 | Bendix Corp | Servomotor having a one-piece center plate |
US3760693A (en) * | 1972-03-15 | 1973-09-25 | Bendix Corp | Tandem servomotor partition |
US3958497A (en) * | 1973-07-30 | 1976-05-25 | The Bendix Corporation | Wall means for a servomotor |
US4596178A (en) * | 1984-03-23 | 1986-06-24 | Aisin Seiki Kabushiki Kaisha | Housing assembly for tandem brake booster |
US4881451A (en) * | 1987-09-03 | 1989-11-21 | General Motors Corporation | Tandem vacuum booster and diaphram for same |
US5507216A (en) * | 1993-10-05 | 1996-04-16 | Nissin Kogyo Co., Ltd. | Tandem type vacuum booster |
US5664479A (en) * | 1994-10-27 | 1997-09-09 | Aisin Seiki Kabushiki Kaisha | Tandem vacuum booster |
US5941610A (en) * | 1996-01-31 | 1999-08-24 | Aisin Seiki Kabushiki Kaisha | Tandem vacuum servo unit for a vehicle braking system |
US6626080B2 (en) * | 2001-08-07 | 2003-09-30 | Delphi Technologies, Inc. | Triple power booster for brake systems |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007010031A1 (en) * | 2005-07-22 | 2007-01-25 | Continental Teves Ag & Co. Ohg | Pneumatic servobrake and diaphragm therefor |
US7938056B2 (en) | 2005-07-22 | 2011-05-10 | Continental Teves Ag & Co. Ohg | Pneumatic servobrake and diaphragm therefor |
WO2018104031A1 (en) * | 2016-12-08 | 2018-06-14 | Continental Teves Ag & Co. Ohg | Pneumatic brake booster having a sealing element |
US11148650B2 (en) | 2016-12-08 | 2021-10-19 | Continental Teves Ag & Co. Ohg | Pneumatic brake booster having a sealing element |
Also Published As
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