US4408457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanically controllable brake booster
Assignee: ITT Inc
•
Filing: 1981-02-23
•
Granted: 1983-10-11
•
Expires: 2001-02-23
Abstract
Abstract To reduce the overall weight of mechanically controlled brake boosters it is known to transmit the axial reaction forces by means of axial draw bars or pipes extending axially within the booster housing. According to the present invention the weight reduction and a decrease in axial length of the brake booster is accomplished having the booster housing shaped like a ring which surrounds and is connected to the maste brake cylinder. The master brake cylinder is fastened to the vehicle splashboard via axial webs extending beyond a lateral wall of the booster housing. A yoke arranged movably between the splashboard and the booster housing contains the valve mechanism and transmits the boosting force from the booster piston (movable wall) to the piston of the master brake cylinder.
Inventors
- 👤 Hans-Henning Luepertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:04
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T13/565; B60T13/563
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
161 words
A mechanically controlled brake booster for automotive vehicles comprising: a pressure casing including at least one boosting piston disposed therein to subdivide said casing into a low-pressure chamber and a working chamber, said piston acting via a connecting member and a reaction device on a push rod operatively associated with a master cylinder, said casing being in the form of a ring having an outer periphery and an inner periphery encircling said master cylinder, said casing having said inner periphery fastened to said master cylinder; a control rod operatively connected to said reaction device to actuate a valve controlling pressure in said working chamber; webs connected to and extending axially from said inner periphery of said casing beyond one lateral wall thereof, said webs securing said casing to a vehicle splashboard; and said connecting member includes at least one transmission member disposed parallel to said webs, and a yoke attached to said transmission member, said yoke extending radially through said webs.
Claim 2
Dependent Claim
161 words
A mechanically controlled brake booster for automotive vehicles comprising: a pressure casing including at least one boosting piston disposed therein to subdivide said casing into a low-pressure chamber and a working chamber, said piston acting via a connecting member and a reaction device on a push rod operatively associated with a master cylinder, said casing being in the form of a ring having an outer periphery and an inner periphery encircling said master cylinder, said casing having said inner periphery fastened to said master cylinder; a control rod operatively connected to said reaction device to actuate a valve controlling pressure in said working chamber; webs connected to and extending axially from said inner periphery of said casing beyond one lateral wall thereof, said webs securing said casing to a vehicle splashboard; and said connecting member includes at least one transmission member disposed parallel to said webs, and a yoke attached to said transmission member, said yoke extending radially through said webs.
Claim 3
Dependent Claim
38 words
A brake booster according to claim 1, wherein said master cylinder extends into a central hollow chamber formed by said inner periphery of said casing and is fastened to said casing adjacent the adjacent end of said webs.
Claim 4
Dependent Claim
28 words
A brake booster according to claim 2, wherein said casing and said master cylinder are interconnected at a common fastening point at the adjacent end of said webs.
Claim 5
Dependent Claim
25 words
A brake booster according to claim 2, wherein said master cylinder is secured to one end of said webs and has said casing secured thereto.
Claim 6
Dependent Claim
34 words
A brake booster according to claim 1 or 2, wherein said transmission member includes a tube extending coaxially out of said casing having its inner and outer circumferential surfaces sealed relative to said casing.
Claim 7
Dependent Claim
33 words
A brake booster according to claim 5, wherein said tube includes a first channel connecting said working chamber to said valve and a second channel connecting said low pressure chamber to said valve.
Claim 8
Dependent Claim
17 words
A brake booster according to claim 6, wherein said yoke houses said reaction device and said valve.
Claim 9
Dependent Claim
15 words
A brake booster according to claim 7, wherein said yoke and said tube are integral.
Claim 10
Dependent Claim
26 words
A brake booster according to claim 8, wherein said yoke includes a cylindrical projection extending into and guided by a guide bore of said master cylinder.
Claim 11
Dependent Claim
18 words
A brake booster according to claim 9, wherein said cylindrical projection houses said reaction device and said valve.
Claim 12
Dependent Claim
47 words
A brake booster according to claim 10, wherein said push rod has one end connected with a piston of said master cylinder and its other end associated with said reaction device, said other end of said push rod being guided in a guide bore of said yoke.
Claim 13
Dependent Claim
32 words
A brake booster according to claim 11, further including a return spring for returning said brake booster to its rest position disposed between said yoke and a surface of said master cylinder.
Claim 14
Dependent Claim
28 words
A brake booster according to claim 12, further including a stop associated with said master cylinder to limit axial displacement of said yoke caused by said return spring.
Claim 15
Dependent Claim
27 words
A brake booster according to claim 13, wherein said piston of said master cylinder includes an extension projecting toward said reaction device operating as said push rod.
Claim 16
Dependent Claim
25 words
A brake booster according to claim 14, further including a compensation chamber surrounding said piston of said master cylinder providing a guide for said yoke.
Claim 17
Dependent Claim
33 words
A brake booster according to claim 15, wherein said valve includes a valve piston having a portion thereof extending axially through said reaction device and guided in a bore of said push rod.
Claim 18
Dependent Claim
45 words
A brake booster according to claim 16, further including another pressure casing disposed in tandem with said casing surrounding said master cylinder containing therein another boosting piston, and said transmission member extends through both of said casings to connect both of said boosting pistons together.
Claim 19
Dependent Claim
17 words
A brake booster according to claim 5, wherein said yoke houses said reaction device and said valve.
Claim 20
Dependent Claim
15 words
A brake booster according to claim 5, wherein said yoke and said tube are integral.
Claim 21
Dependent Claim
26 words
A brake booster according to claim 5, wherein said yoke includes a cylindrical projection extending into and guided by a guide bore of said master cylinder.
Claim 22
Dependent Claim
18 words
A brake booster according to claim 20, wherein said cylindrical projection houses said reaction device and said valve.
Claim 23
Dependent Claim
47 words
A brake booster according to claim 5, wherein said push rod has one end connected with a piston of said master cylinder and its other end associated with said reaction device, said other end of said push rod being guided in a guide bore of said yoke.
Claim 24
Dependent Claim
32 words
A brake booster according to claim 5, further including a return spring for returning said brake booster to its rest position disposed between said yoke and a surface of said master cylinder.
Claim 25
Dependent Claim
28 words
A brake booster according to claim 23, further including a stop associated with said master cylinder to limit axial displacement of said yoke caused by said return spring.
Claim 26
Dependent Claim
27 words
A brake booster according to claim 5, wherein a piston of said master cylinder includes an extension projecting toward said reaction device operating as said push rod.
Claim 27
Dependent Claim
25 words
A brake booster according to claim 5, further including a compensation chamber surrounding a piston of said master cylinder providing a guide for said yoke.
Claim 28
Dependent Claim
33 words
A brake booster according to claim 5, wherein said valve includes a valve piston having a portion thereof extending axially through said reaction device and guided in a bore of said push rod.
Claim 29
Dependent Claim
45 words
A brake booster according to claim 5, further including another pressure casing disposed in tandem with said casing surrounding said master cylinder containing therein another boosting piston, and said transmission member extends through both of said casings to connect both of said boosting pistons together.
Claim 30
Dependent Claim
20 words
A brake booster according to claim 1 or 2, wherein said transmission member includes a plurality of evenly spaced rods.
Claim 31
Dependent Claim
43 words
A brake booster according to claim 29, wherein one of said plurality of rods includes a first bore connecting said working chamber to said valve, and another of said plurality of rods includes a second bore connecting said low-pressure chamber to said valve.
Claim 32
Dependent Claim
17 words
A brake booster according to claim 30, wherein said yoke houses said reaction device and said valve.
Claim 33
Dependent Claim
15 words
A brake booster according to claim 31, wherein said yoke and said tube are integral.
Claim 34
Dependent Claim
25 words
A brake according to claim 32, wherein said yoke includes a cylindrical projection extending into and guided by a guide bore of said master cylinder.
Claim 35
Dependent Claim
18 words
A brake booster according to claim 33, wherein said cylindrical projection houses said reaction device and said valve.
Claim 36
Dependent Claim
47 words
A brake booster according to claim 34, wherein said push rod has one end connected with a piston of said master cylinder and its other end associated with said reaction device, said other end of said push rod being guided in a guide bore of said yoke.
Claim 37
Dependent Claim
32 words
A brake booster according to claim 35, further including a return spring for returning said brake booster to its rest position disposed between said yoke and a surface of said master cylinder.
Claim 38
Dependent Claim
28 words
A brake booster according to claim 36, further including a stop associated with said master cylinder to limit axial displacement of said yoke caused by said return spring.
Claim 39
Dependent Claim
27 words
A brake booster according to claim 37, wherein said piston of said master cylinder includes an extension projecting toward said reaction device operating as said push rod.
Claim 40
Dependent Claim
25 words
A brake booster according to claim 38, further including a compensation chamber surrounding said piston of said master cylinder providing a guide for said yoke.
Claim 41
Dependent Claim
33 words
A brake booster according to claim 39, wherein said valve includes a valve piston having a portion thereof extending axially through said reaction device and guided in a bore of said push rod.
Claim 42
Dependent Claim
45 words
A brake booster according to claim 40, further including another pressure casing disposed in tandem with said casing surrounding said master cylinder containing therein another boosting piston, and said transmission member extends through both of said casings to connect both of said boosting pistons together.
Claim 43
Dependent Claim
17 words
A brake booster according to claim 29, wherein said yoke houses said reaction device and said valve.
Claim 44
Dependent Claim
47 words
A brake booster according to claim 29, wherein said push rod has one end connected with a piston of said master cylinder and its other end associated with said reaction device, said other end of said push rod being guided in a guide bore of said yoke.
Claim 45
Dependent Claim
33 words
A brake booster according to claim 29, wherein said valve includes a valve piston having a portion thereof extending axially through said reaction device and guided in a bore of said push rod.
Claim 46
Dependent Claim
45 words
A brake booster according to claim 29, further including another pressure casing disposed in tandem with said casing surrounding said master cylinder containing therein another boosting piston, and said transmission member extends through both of said casings to connect both of said boosting pistons together.
References Cited (Backward Citations)
US2731534A
Cited
GB2040376A
Cited
US4338854A
Cited
US4347779A
Cited
GB2070172A
Cited
GB2072777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |