GB2075137A - A sealing and guiding device for a braking power amplifier - Google Patents

A sealing and guiding device for a braking power amplifier Download PDF

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Publication number
GB2075137A
GB2075137A GB8113494A GB8113494A GB2075137A GB 2075137 A GB2075137 A GB 2075137A GB 8113494 A GB8113494 A GB 8113494A GB 8113494 A GB8113494 A GB 8113494A GB 2075137 A GB2075137 A GB 2075137A
Authority
GB
United Kingdom
Prior art keywords
sealing
elastic material
sleeve
power amplifier
guiding
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
Application number
GB8113494A
Other versions
GB2075137B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHO Holding GmbH and Co KG
Original Assignee
FAG Kugelfischer Georg Schaefer KGaA
Kugelfischer Georg Schaefer and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FAG Kugelfischer Georg Schaefer KGaA, Kugelfischer Georg Schaefer and Co filed Critical FAG Kugelfischer Georg Schaefer KGaA
Publication of GB2075137A publication Critical patent/GB2075137A/en
Application granted granted Critical
Publication of GB2075137B publication Critical patent/GB2075137B/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • 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
    • B60T13/567—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of the casing or by its strengthening or mounting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Braking Arrangements (AREA)
  • Sealing Devices (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

A device for sealing a vacuum chamber of a braking power amplifier and for guiding a cylinder extending outwardly therefrom, the device being a stepped diameter sleeve (5) provided at one end with foldable lobes (6) which serve to fasten it about an aperture in the amplifier casing, and with a lining (4) of an elastic material. The internal surface of the lining is provided with sealing and guiding lips 9. The outer lip 9 may be urged by a spring 10 radially inwardly. <IMAGE>

Description

SPECIFICATION A sealing and guiding device for a braking power amplifier This invention relates to a sealing and guiding device for a braking power amplifier, more particularly to a device for sealing the vacuum chamber of a vacuum-operable power-assist unit of a hydraulic-pneumatic amplifier and for guiding an axially displaceable cylinder extending from the chamber axially outwardly.
Such a device is known from, for example, Fig. 1 of German Patent No. 23 37 323. The device shown in this Figure is in the hub of an amplifier-casing end cover through which the cylinder passes. The device is biased radially inwardly by the cover towards the cylinder and, in addition, is held in position by axial stop elements, for example toothed rings.
To bias the known sealing and guiding devices radially inwardlydisregarding the stop elements---calls for the devices and the hubs of the end covers to be manufactured to close tolerances, and thus extended production times, in order to ensure optimum securement, sealing tightness and guiding function.
It is an aim of the invention, therefore, to improve a sealing and guiding device for a braking power amplifier in such a way as to simplify its construction yet to permit wider tolerances for the hub and for the sealing device itself, to render secure attachment possible and to ensure a reliable and well functioning seal and guiding function.
Accordingly, the invention, from its widest aspect, is directed to a vacuum chamber sealing and cylinder guiding device for a braking power amplifier, the device being a stepped diameter sleeve provided at one end with foldable lobes for fastening it to the amplifier casing and being lined with an elastic material.
From a somewhat narrower aspect, the invention is directed to a device for sealing the vacuum chamber of a vacuum-operable power-assist unit of a hydraulic-pneumatic braking power amplifier and for guiding an axially displaceable cylinder extending axially outwardly from the chamber, the device being a stepped diameter sleeve mountable at the amplifier-casing end through which the cylinder extends, being provided at the free end of its reduced diameter portion with foldable lobes serving to fasten it to said casing end, and being lined with an elastic material.
The lobes of a device according to the invention exert, when during assembly of the device with the amplifier they are folded, a very high pulling, or tightening, force, thus rendering it possible for the device not only to be securely attached to the amplifier casing but also to be concentrically located in a bore of the casing, and this notwithstanding considerably wider manufacturing tolerances than hitherto feasible.
In order to make'the invention and ssme of its subsidiary features more readily understood, one embodiment thereof will now be described, by way of example only, with reference to the accompanying drawings, in which Figure 1 is a cross-sectional view of a sealing and guiding device according to the invention mounted in a hydraulic-pneumatic braking power amplifier; and Figure 2 is a front view, partly in crosssection, of a part of a lined stepped diameter sleeve of the device in its unmounted state.
A hydraulic-pneumatic braking power amplifier only partly shown in Fig. 1 is denoted by the reference numeral 1. The amplifier is surrounded by a casing 2 enclosing adjacent to the end illustrated the vacuum chamber 2a of a vacuum-operable power-assist unit and having an inwardly directed flange 3 to which a sealing and guiding device according to the invention is fastened. An axially displaceable cylinder 1 a extends from the vacuum chamber 2a through the bore defined by the flange 3 axially outwardly, its displacement taking place when the foot brake of the motor vehicle, in which the amplifier is installed, is applied and released respectively. As may be seen from Fig. 1, there is a gap between the cylinder and the flange.To seal this gap, and thus the vacuum chamber, and to guide the cylinder is the function of the sealing and guiding device which comprises a stepped diameter sleeve 5, preferably made of sheet metal. In order to fasten the sleeve 5 to the flange 3, it is provided at the free end of its reduced diameter portion with foldable lobes 6 which after assembly back-grip the flange 3. The sleeve 5 is lined with an elastic material 4, for example rubber, and is provided with a radially outwardly extending flange 7 serving to hold a protecting cap 8. The lining 4 extends beyond the sleeve's end remote from the lobes 6, and both the lining and the sleeve are formed with axially spaced continuous projections 9 extending radially inwardly from their respective internal surfaces.The projections of the lining 4 disposed in its extension serve substantially as sealing lips and its remaining ones as cylinder-guiding lips. The projections of the sleeve, which may be seen more clearly in Fig. 2, serve substantially for securely anchoring the lining 4 to the sleeve 5.
At least one of the sealing lips 9 is biased radially inwardly by a circumferentially extending continuous spring ring 10 made of helically wound wire.
In addition to being lined, the external circumferential surface of the sleeve is preferably clad, at last partly, with an elastic material which may again be rubber. In any case, and as clearly shown in Fig. 2, the external face of the step extending radially between the sleeve's reduced diameter portion and its other portion is clad with an elastic material 1 2. It is also advantageous if the small part of the reduced diameter portion between said step and the lobes 6 including the latter are clad by an elastic material. If this is done, the elastic material covering the lobes will stretch and be deformed when during assembly the lobes are folded.An additional advantage of thus covering the lobes with an elastic material is that they, and the flange 3, may be manufactured with wide tolerances which are compensated by the presence of the elastic material. Finally, the free surface of the cladding 1 2 that faces the casing 2 is provided with coaxially disposed axially outwardly extending projections 11 which also form sealing lips.
For assembling the sealing and guiding device with the amplifier the reduced diameter portion thereof provided with the lobes 6 is inserted into the bore of the flange 3 until the projections 11 of the cladding 1 2 on the external face of the step abut on the flange 3 of the casing 2. Thereafter, the lobes 6 are folded by 90 so that they back-grip the flange 3. As a result, the axial projections 11 are compressed and lightly pressed against the flange 3. The sealing and guiding device can thus be attached securely to the casing 2without having to work to close manufacturing tolerances-and its concentric positioning will be achieved without any difficulty.

Claims (11)

1. A vacuum chamber sealing and cylinder guiding device for a braking power amplifier, the device being a stepped diameter sleeve provided at one end with foldable lobes for fastening it to the amplifier casing and being lined with an elastic material.
2. A device for sealing the vacuum cham- ber of a vacuum-operable power-assist unit of a hydraulic-pnemuatic braking power amplifier and for guiding an axially displaceable cylinder extending axially outwardly from the chamber, the device being a stepped diameter sleeve mountable at the amplifier-casing end through which the cylinder extends, being provided at the free end of its reduced diameter portion with foldable lobes serving to fasten it to said casing end, and being lined with an elastic material.
3. A device according to claim 1 or claim 2, wherein the external face of the step extending radially between the sleeve's reduced diameter portion and its other portion is clad with an elastic material.
4. A device according to any of the preceding claims, wherein at least some parts of the sleeve's external circumferential surface are clad with an elastic material.
5. A device according to claim 4, wherein the parts clad by the elastic material include the lobes.
6. A device according to any of the preceding claims, wherein the elastic material is rubber.
7. A device according to any of the preceding claims, wherein the lining extends beyond the sleeve's end remote from the lobes, wherein the lining is formed with axially spaced continuous projections extending radially inwardly from its internal surface, and wherein the projections disposed in its extension are substantially sealing lips while the remaining ones are substantially cylinder guiding lips.
8. A device according to any of the preceding claims, wherein the sleeve is formed with axially spaced continuous projections extending radially inwardly from its internal surface, and wherein the projections serve substantially for securing the lining.
9. A device according to claim 7 or claim 8, wherein at least one of the sealing lips is bised radially inwardly by a circumferentially extending continuous spring ring, and wherein the, or each, ring is made of helically wound wire.
10. A device according to any of the claims 3 to 9, wherein the elastic material cladding the step is provided with coaxially disposed axially outwardly extending projections.
11. A sealing and guiding device for a braking power amplifier, constructed and arranged substantially as herein described with reference to the accompanying illustrative drawings.
1 2. A braking power amplifier including a sealing and guiding device as claimed in any of the claims 1 to 11.
GB8113494A 1980-05-03 1981-05-01 Sealing and guiding device for a braking power amplifier Expired GB2075137B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803017051 DE3017051A1 (en) 1980-05-03 1980-05-03 SEALING AND GUIDE DEVICE ON BRAKE POWER AMPLIFIERS

Publications (2)

Publication Number Publication Date
GB2075137A true GB2075137A (en) 1981-11-11
GB2075137B GB2075137B (en) 1984-01-18

Family

ID=6101564

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8113494A Expired GB2075137B (en) 1980-05-03 1981-05-01 Sealing and guiding device for a braking power amplifier

Country Status (3)

Country Link
DE (1) DE3017051A1 (en)
FR (1) FR2481775A1 (en)
GB (1) GB2075137B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568970A1 (en) * 1984-08-09 1986-02-14 Chicago Rawhide Mfg Co FLUID SEALING DEVICE, IN PARTICULAR FOR TREES
US4793242A (en) * 1986-11-10 1988-12-27 Jidosha Kiki Co., Ltd. Brake Booster with a seal and guide unit
EP0707166A1 (en) * 1994-10-12 1996-04-17 GEBRÜDER MÜLLER APPARATEBAU GmbH &amp; Co. KG Seal

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3229830A1 (en) * 1982-08-11 1984-02-16 FAG Kugelfischer Georg Schäfer KGaA, 8720 Schweinfurt Sealing and guiding device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB727814A (en) * 1952-07-18 1955-04-06 George Clarke Presswork Co Ltd Improvements relating to sealing devices
US3498621A (en) * 1968-04-25 1970-03-03 Dana Corp Valve stem seal
US3531134A (en) * 1969-06-06 1970-09-29 K Line Ind Inc Seal retainer
DE1957897A1 (en) * 1969-11-18 1971-06-03 Bosch Gmbh Robert Brake amplifier for motor vehicles
DE2337323C3 (en) * 1973-07-23 1978-09-14 Kugelfischer Georg Schaefer & Co, 8720 Schweinfurt Brake booster
DE2718659C2 (en) * 1977-04-27 1985-10-31 Robert Bosch Gmbh, 7000 Stuttgart Shaft seal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568970A1 (en) * 1984-08-09 1986-02-14 Chicago Rawhide Mfg Co FLUID SEALING DEVICE, IN PARTICULAR FOR TREES
US4793242A (en) * 1986-11-10 1988-12-27 Jidosha Kiki Co., Ltd. Brake Booster with a seal and guide unit
EP0707166A1 (en) * 1994-10-12 1996-04-17 GEBRÜDER MÜLLER APPARATEBAU GmbH &amp; Co. KG Seal

Also Published As

Publication number Publication date
FR2481775A1 (en) 1981-11-06
DE3017051A1 (en) 1981-11-05
FR2481775B1 (en) 1985-02-22
GB2075137B (en) 1984-01-18

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950501