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
  • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
  • B60T17/02—Arrangements of pumps or compressors, or control devices therefor
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/7722—Line condition change responsive valves
  • Y10T137/7837—Direct response valves [i.e., check valve type]
  • Y10T137/7838—Plural
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/7722—Line condition change responsive valves
  • Y10T137/7837—Direct response valves [i.e., check valve type]
  • Y10T137/7838—Plural
  • Y10T137/7842—Diverse types
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/7722—Line condition change responsive valves
  • Y10T137/7837—Direct response valves [i.e., check valve type]
  • Y10T137/7876—With external means for opposing bias
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/8593—Systems
  • Y10T137/87917—Flow path with serial valves and/or closures
  • Y10T137/87981—Common actuator

Definitions

• the invention relates to a device for generating and providing a negative pressure for a
• the invention also relates to a ventilation valve.
• Such devices for generating and providing a negative pressure are used, for example, in vehicles for operating a brake booster.
• a problem has been found that when the vehicle is stopped and the engine off, the negative pressure in the brake booster gradually decreases due to leaks, especially in the vacuum generator and to the suction valve and approaches the ambient pressure.
• the brake pedal can not be moved when the vehicle is attempted to start, and thus the trigger point required for starting is not reached in vehicles for automatic transmissions, and therefore the vehicle can not be started.
• the check valve in front of the brake booster which has no check spring as the suction valve.
• the invention has for its object to provide a device and / or a vent valve, which reduces the risk that the brake booster is gradually vented.
• a device for generating and providing a negative pressure for a vacuum consumer with a vacuum source, a suction valve, a between the vacuum consumer and the Suction valve disposed check valve, and a vent valve whose control input is connected to the suction port of the vacuum source whose output between the control valve and the check valve opens and whose input is open to the environment.
• the device according to the invention has the significant advantage that by means of the ventilation valve, the line section between the suction valve and the check valve, which is immediately before the vacuum, ie the brake booster, is vented, so that the check valve, should this have an indifferent position, its closed position occupies.
• the check valve has no check or closing spring, as a closing spring, which keeps the check valve always in the defined closed position, the evacuation of the vacuum source, that is, the vacuum pump would significantly limit. Therefore, unlike the suction valve, the check valve is equipped without a closing spring, that is, without a return spring. An indifferent position can take the check valve whenever there is the same pressure in front of and behind the check valve.
• the ventilation valve has a housing with three pressure chambers, wherein the control input opens into the first pressure chamber.
• the second pressure chamber is connected to the environment via an inlet or an opening, the outlet of the ventilation valve discharging from the third pressure chamber.
• the first pressure chamber on a wall, which is formed in sections of an elastic membrane. This elastic membrane responds to the pressure in the first pressure chamber by deforming and acting as a drive for a plunger. Depending on the pressure in the first pressure chamber, the plunger assumes a position corresponding to the pressure, starting from a threshold value.
• the plunger has a second valve member separating from the third pressure chamber. With the plunger so the second can be connected to the third pressure chamber by means of the plunger, the valve element is moved. The opening or closing of this valve thus depends on the pressure in the first pressure chamber.
• the valve element is biased in the direction of the valve seat, in particular with a spring.
• this biasing force can preferably also be adjustable and the biasing force counteracts the pressure in the first pressure chamber.
• the housing of two, in particular identical cup-shaped housing parts is constructed, which face each other with their openings and flanged to each other.
• the housing can be fitted in this way relatively easy and then mounted.
• Figure 1 shows the device according to the invention with closed vent valve in longitudinal section
• FIG. 2 shows the device according to FIG. 1 with opened venting valve.
• FIG. 1 shows a device, generally designated 10, with which a negative pressure for a vacuum consumer 12, for example a brake booster 14 for a vehicle, can be generated and provided.
• a vacuum source 16 for example, a vacuum pump 18, is provided, the suction port 20 is equipped with a suction valve 22.
• the suction valve 22 is held by means of a closing spring 24 or return spring in a defined closed position.
• the suction valve 22 is in turn connected via a line 26 to a check valve 28, wherein the check valve 28 is designed without closing spring.
• the check valve 28 is finally with the
• FIG. 1 also shows a ventilation valve 30, which has a housing 34 made up of two identical housing parts 32.
• a first pressure chamber 36 In the housing 34, a first pressure chamber 36, a second pressure chamber 38 and a third pressure chamber 40 are formed.
• the first pressure chamber 36 has a control input 42 which is connected to the suction port 20 or the vacuum source 16 itself.
• the second pressure chamber 48 has two openings formed as openings 44, which connect them to the environment 46, so that air can flow in the direction of the arrow 48.
• the third pressure chamber 40 has an output 50 which is connected to the conduit 26.
• the two housing parts 32 have at the transition from the second pressure chamber 38 to the first pressure chamber 36 and from the second pressure chamber 38 to the third pressure chamber 40, a shoulder 52, so that between the two shoulders 52, an inner housing 54 can be tightened.
• This inner housing 54 has two terminal plates 56 each secured by a seal 58, e.g. an O-ring, are tightly received by the two housing parts 32 and which are connected to each other via a sleeve 60.
• the inner housing 54 is made in one piece and has a central bore 62 in which a plunger 64 is slidably mounted in the direction of the longitudinal axis of the ventilation valve 30.
• the upper end of the plunger 64 abuts a diaphragm 66, which forms a wall of the first pressure chamber 36 and which is clamped with its edge between the shoulder 52 and one of the plates 56 of the inner housing 54.
• the lower end of the plunger 64 is equipped with a valve element 68, in particular a sealing washer 70, which rests in parallel on the lower plate 56 of the inner housing 54 and is biased in the direction thereof by means of a helical spring 72. With the valve member 68 through holes 74 are sealed, which penetrate the lower plate 56 and connect the second pressure chamber 38 with the third pressure chamber 40.
• valve element 68 In the figure 1, the closed position of the valve element 68 is shown, in which the valve element 68 at a valve seat 76 forming plate 56 is present. In the figure 2, the valve element 68 is lifted from the valve seat 76.
• the vacuum source 18 With the vacuum source 18, a negative pressure is generated, which rests not only on the vacuum consumer 12, but also on the first pressure chamber 36 and the third pressure chamber 40 via the connecting lines. If the vacuum source 16 is turned off, for example, when the engine of a vehicle, then closes the suction valve 22 due to the closing spring 24, whereas the check valve 28 can assume an indifferent position, since the closing member is not urged by a closing spring in the closed position and the front and behind the check valve 28 prevailing pressure difference is too small to produce an air flow which urges the valve member of the check valve 28 in the closed position.
• the valve element 68 lifts off from the valve seat 76, which, as already mentioned, is shown in FIG.
• the passage openings 74 are now open and the third pressure chamber 40 is (briefly) connected to the second pressure chamber 38 and thus via the openings 44 with the environment 46, so that air in the direction of arrows 48 can flow into the third pressure chamber 40.
• the line 26 is vented, whereby the check valve 28 is urged due to the pressure prevailing before and behind the check valve 28 caused short-term air flow in its defined closed position, so that the negative pressure prevailing in the vacuum 12 vacuum can be maintained.
• the check valve 28 assumes in any case its closed position, since the pressure difference before and after the check valve 28 is large enough to urge its closing member against its valve seat with certainty.
• the air flowing into the line 26 is oil-free and can also be passed through a filter, so that it is also dust-free.
• the negative pressure consumer 12 in particular the brake booster 14 is always subjected to a negative pressure, that is to say even when the vacuum source 16 is at a standstill.

Landscapes

• Engineering & Computer Science (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Valves And Accessory Devices For Braking Systems (AREA)
• Check Valves (AREA)
• Jet Pumps And Other Pumps (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=41335240

Family Applications (1)

Country Status (6)

Families Citing this family (2)

Family Cites Families (9)

• 2008
  • 2008-07-01 DE DE200810032242 patent/DE102008032242B4/de active Active
• 2009
  • 2009-06-29 CN CN2009801161385A patent/CN102015394B/zh active Active
  • 2009-06-29 US US12/999,215 patent/US8973604B2/en active Active
  • 2009-06-29 JP JP2011515408A patent/JP5242783B2/ja not_active Expired - Fee Related
  • 2009-06-29 WO PCT/EP2009/058105 patent/WO2010000694A2/de active Application Filing
  • 2009-06-29 EP EP09772394A patent/EP2291304A2/de not_active Withdrawn

Non-Patent Citations (1)

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