SE541576C2 - A compressed-air brake system - Google Patents

A compressed-air brake system

Info

Publication number
SE541576C2
SE541576C2 SE1750146A SE1750146A SE541576C2 SE 541576 C2 SE541576 C2 SE 541576C2 SE 1750146 A SE1750146 A SE 1750146A SE 1750146 A SE1750146 A SE 1750146A SE 541576 C2 SE541576 C2 SE 541576C2
Authority
SE
Sweden
Prior art keywords
compressed
air
regular
tanks
pressure
Prior art date
Application number
SE1750146A
Other versions
SE1750146A1 (en
Inventor
Arne Lindqvist
Daniel Steen
Johan Thorsell
Original Assignee
Scania Cv Ab
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 Scania Cv Ab filed Critical Scania Cv Ab
Publication of SE1750146A1 publication Critical patent/SE1750146A1/en
Publication of SE541576C2 publication Critical patent/SE541576C2/en

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
    • 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
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • 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
    • B60T13/26—Compressed-air systems
    • B60T13/268—Compressed-air systems using accumulators or reservoirs
    • 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
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • 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
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
    • 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
    • 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
    • B60T17/06—Applications or arrangements of reservoirs

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

A compressed-air brake system for heavy and medium heavy motor vehicles comprises a front brake circuit (14) and a rear brake circuit (15) each having at least one regular compressed-air tank (17, 18) containing compressed air of a regular pressure to be supplied to service brakes of the vehicle. At least one high compressed-air tank (10) is arranged to contain compressed-air of a pressure exceeding the regular pressure by at least 50%. Said high compressed-air tank(s) is/are configured to contain a total amount of air in a relation of at least 1:1 to the total amount of air said regular compressed-air tanks (17, 18) are configured to contain. Each regular compressed-air tank has an inlet connected to an outlet of a said high compressed-air tank through a pressure limiting member (16).

Description

A COMPRESSED-AIR BRAKE SYSTEM TECHNICAL FIELD OF THE INVENTION AND BACKGROUND ART The present invention relates to a compressed-air brake system for heavy and medium heavy motor vehicles, comprising a front brake circuit and a rear brake circuit each having at least one regular compressed-air tank configured to contain compressed-air of a regular pressure to be supplied to service brakes of the vehicle.
Such brake systems also have a third brake circuit in the form of a parking brake circuit, and medium heavy motor vehicles does here mean motor vehicles with a weight ? 3.5 ton.
The compressed-air is produced by a compressor, which is normally driven by the engine of the vehicle, and then supplied to said regular compressed-air tanks of the front brake circuit and the rear brake circuit. Braking of the vehicle is then obtained by actuation of valves supplying the service brakes of the vehicle with the compressed-air from said tanks. These service brakes may be of any conceivable type controlled by supply of compressed-air, for example disc brakes or drum brakes. Said regular pressure of the compressed air in said tanks is normally in the order of 10 bar. The total volume of said regular compressed-air tanks, which may be more than one per brake circuit, is for a truck typically 90 litres 30 litres/further axle, which often means in the order of 200 litres. It may constitute problems to fit this total volume for the tanks for providing the total air volume needed for the brake system of such a truck. This means a number of air tanks arranged in the chassis of the truck, and they have sometimes to be mounted on the outside of the frame reducing the available space for arranging fuel tanks.
SUMMARY OF THE INVENTION The object of the present invention is to provide a compressed-air brake system defined in the introduction being improved in at least some aspect with respect to such systems already known.
This object is obtained by providing such a compressed-air brake system with the features listed in the characterizing part of appended patent claim 1.
By the arrangement of said at least one high compressed-air tank, connecting the inlet thereof to a compressor and configuring this compressed-air tank to function as a master compressed-air tank configured to provide the regular compressed-air tanks with compressed-air and to contain compressed-air of a pressure exceeding the regular pressure by at least 50% and having this/these compressed-air tank(s) configured to contain a total amount of air in a relation of at least 1:1 to the total amount of air said regular compressed-air tanks are configured to contain, the same amount of air as in brake systems having only regular compressed-air tanks may be provided in a reduced total volume of compressedair tanks. Accordingly, the brake performance of such a brake system may be maintained with a smaller total tank volume. Thus, space are made available for other equipment of the vehicle, such as additional or larger fuel tanks.
US 4 496 192 discloses a compressed-air brake system having high compressed-air tanks instead of regular compressed-air tanks and a pressure limiting member arranged between these compressed air tanks and valves controlling the supply of compressed air to the service brakes. This brake system is provided with high compressed-air tanks for making the initiation of the braking action of the service brakes particularly rapid.
Furthermore, US 6 149 246 discloses a compressed air supply system for providing compressed air to a brake system as well as an air-suspension system of the vehicle so as to save volume needed for compressed-air tanks of these two systems.
According to an embodiment of the invention said relation is at least 1.5:1 or at least 2:1. This means that the total volume for compressed-air tanks may be reduced by 20%-60% or 25-65%, which means that a considerable space is made available for other purposes.
According to another embodiment of the invention said at least one high compressed-air tank is configured to contain compressed air of a pressure exceeding said regular pressure by 50%-600%, at least 100% or at least 200%. The upper limit means that the volume reduction for compressed air tanks will be at least 40% but already the lower limit of 50% means a minimum volume reduction of nearly 20%.
According to another embodiment of the invention the total volume of said high compressed-air tank(s) is at least the same as the total volume of said regular compressed-air tanks or exceeds this total volume by at least 50% or at least 100%. These features result in a substantial possible reduction of the total volume of compressed-air tanks with respect to having the same amount of compressed air in only regular compressed-air tanks.
According to another embodiment of the invention the total volume of said regular compressed-air tanks is ? 15 litres, ? 3 litres or 3-15 litres per axle of the vehicle. This results in a possibility to use small air tanks which will be easy to fit into the chassis of a vehicle.
According to another embodiment of the invention the total volume of said high compressed-air tank(s) is 10-100 litres, 30-100 litres or 40-80 litres, which are suitable total volumes of tanks containing compressed-air of a high pressure for obtaining a reduction of the total volume of compressed-air tanks aimed at.
According to another embodiment of the invention said regular compressed-air tanks are configured to contain compressed-air of a pressure of 7.5-15 bar, 10-13 bar or 12.5 bar. These are suitable levels of compressed-air to be supplied to service brakes of a vehicle of this type.
According to another embodiment of the invention said compressed-air tank(s) is/are configured to contain compressed-air of a pressure of ? 15 bar, ? 20 bar, 20-60 bar or 30-50 bar. These levels of the pressure in the high compressed-air tanks enables a substantial reduction of the total volume of compressed-air tanks in a compressed-air brake system for heavy and medium heavy motor vehicles.
According to another embodiment of the invention said tanks of the system are configured to contain compressed-air in an amount of 1 bar x m<3>- 3.5 bar x m<3>. These amounts of compressed air in the tanks of the brake system makes it possible to obtain a brake performance required for this type of vehicles.
According to another embodiment constituting a further development of the embodiment last mentioned the system comprises a further regular compressed air tank having the inlet connected to said pressure limiting member and the outlet connected to said brake circuits protecting device for delivering compressed-air of a regular pressure to this device. This constitutes another alternative to have a high compressed-air tank upstream the branching of the brake circuits from the brake circuits protecting device but feeding compressed-air with said regular pressure to the regular compressed-air tanks of the brake circuits through the brake circuits protecting device.
According to another embodiment of the invention the system has a brake circuits protecting device from which said front brake circuit and rear brake circuit are branched, and the front brake circuit and the rear brake circuit have each at least one said high compressed-air tank connected to said at least one regular compressed-air tank of that circuit through a said pressure limiting member. This constitutes a further alternative to position high compressed-air tanks to reduce the total volume of compressedair tanks of a compressed-air brake system of the type to which the present invention is directed.
The invention also relates to a motor vehicle according to claim 10.
Other advantageous features as well as advantages of the present invention appear from the description following below.
BRIEF DESCRIPTION OF THE DRAWINGS With reference to the appended drawings, below follows a specific description of embodiments of the invention cited as examples.
In the drawings: Fig 1 is a schematic view illustrating how compressed-air tanks for a brake system may be arranged in a truck, and Figs 2-5 show parts of compressed-air brake systems of relevance for the present invention of four embodiments of compressed-air brake systems according to the invention.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION Fig 1 shows schematically how compressed air tanks 1 -4 of a compressed-air brake system may be arranged on the chassis 5 of a motor vehicle 6 in the form of a truck. It appears that these compressed-air tanks may demand a considerable space restricting the space available for other components of the vehicle, such as fuel tanks.
Fig 2 shows schematically a compressed-air brake system for a heavy and a medium heavy motor vehicle according to a first embodiment of the invention. A compressor 7, which may be driven by the engine for the propulsion of the vehicle, is configured to create a flow of compressed-air through a conduit 8 to an air dryer unit 9 removing water created through the compression of air from the air flow and further to the inlet of a high compressed-air tank 10 configured to contain compressed-air of a high pressure, for example in the order of 20-40 bar. The outlet of the tank 10 is connected to a unit 11 containing a brake circuits protecting device 12 from which three brake circuits 13-15 are branched, namely a parking brake circuit 13, a front brake circuit 14 and a rear brake circuit 15. Thus, this device 12 does for security reason restrict these three brake circuits with respect to each other. The unit 11 also contains a pressure limiting member 16 configured to limit the pressure of compressed-air arriving thereto from the tank 10 to a lower value appropriate for compressed to be supplied to the parking brake and service brakes of the vehicle. It is shown how inlets of regular compressed-air tanks 17, 18 in the rear and front brake circuits are connected to the unit 11, and these regular compressed-air tanks are configured to contain compressed-air of a regular pressure, typically 12.5 bar, to be supplied to service brakes of the vehicle. It is indicated that the outlets of these regular compressed-air tanks 17, 18 are connected to valves 19, 20 to be actuated to supply compressed air to service brakes of the vehicle when braking the vehicle.
Thus, the high compressed-air tank 10 functions as a type of master compressed-air tank providing the regular compressed-air tanks 17, 18 with compressed-air. Thanks to the higher pressure in the high compressed-air tank 10 the total volume of the compressed-air tanks for containing a certain amount of compressedair may be reduced with respect to having only regular compressed-air tanks in the brake system. The higher the pressure in the high compressed-air tank and the larger the volume of this air tank the more space may be saved.
Fig 3 shows a compressed-air brake system according to a second embodiment of the invention differing from that shown in Fig 2 only by the arrangement of the pressure limiting member 16 directly downstream the compressed-air tank 10 with a further regular compressed-air tank 21 arranged between the pressure limiting member 16 and the brake circuits protecting device 12. This is the reason for using the same reference numerals in this Figure as in Fig 2. This constitutes a further alternative to provide the total amount of compressed-air to be available for ensuring proper braking of the vehicle through the compressed-air brake system.
Fig 4 shows a compressed-air brake system according to a third embodiment of the invention having a compressor 40, an air dryer unit 41, a brake circuits protecting device 42 from which a parking brake circuit 43, a front brake circuit 44 and a rear brake circuit 45 are branched. The front brake circuit and the rear brake circuit have each a high compressed-air tank 46, 47 configured to contain compressed-air of a high pressure, and these are through a pressure limiting member 48, 49 connected to a regular compressedair tank 50, 51 configured to supply compressed-air of a regular pressure, such as 12.5 bar, to service brakes of the vehicle by actuation of valves 52, 53. Thus, the high compressed-air tanks 46, 47 are configured to act as master compressed-air tanks feeding the regular compressed-air tanks 50, 51 with compressed air for providing them with compressed-air of a pressure suitable for controlling the service brakes of the vehicle.
Fig 5 shows a compressed-air brake system according to a fourth embodiment of the invention illustrating a possible variation of the structure of the compressed-air brake system within the scope of the present invention, in which 59 is a compressor, 60 an air dryer unit, 61 a brake circuits protecting device, 62 a parking brake circuit, 63 a front brake circuit, 64 a rear brake circuit, 65-68 high compressed-air tanks configured to contain compressed-air of a high pressure, 69 and 70 pressure limiting members and 71 -76 regular compressed-air tanks configured to contain compressedair of a regular pressure to be supplied to a parking brake and the service brakes of the vehicle.
The embodiments of the invention shown in the figures and described above are only a few of numerous possible embodiments of the invention, and the embodiment selected for a particular motor vehicle is depending upon a number of parameters, such as the main application of the motor vehicle, the number of axles thereof and the degree of priority to save space for making it available for other components than compressed-air tanks.
Thus, a lot of possible modifications of the embodiments disclosed above would be apparent to a person with skill in the art without departing from the scope of the invention as defined in the appended claims.

Claims (10)

Claims
1. A compressed-air brake system for heavy and medium heavy motor vehicles (6), having brake circuits which comprises a front brake circuit (14), a rear brake circuit (15) and a parking brake circuit (13), in which the front brake circuit and the rear brake circuit have at least one regular compressed-air tank (17, 18, 21) configured to contain compressed-air of a regular pressure to be supplied to service brakes of the vehicle, and a regular compressed-air tank (21) is configured to supply compressed-air to the parking brake circuit (13), characterized in that the system comprises at least one high compressed-air tank (10) configured to contain compressedair of a pressure exceeding said regular pressure by at least 50% and a compressor (7) connected to the inlet of said at least one high compressed-air tank and configured to supply this tank with compressed-air, that said high compressed-air tank(s) is/are configured to contain a total amount of air in a relation of at least 1:1 to the total amount of air said regular compressed-air tanks (17, 18, 21) are configured to contain, that each regular compressed-air tank of the brake circuits has an inlet connected to an outlet of a said high compressed-air tank through a pressure limiting member (16) and a brake circuits protecting device (12) from which the brake circuits (13-15) of the system are branched, and that said at least one high compressed-air tank (10) is configured to function as a master compressed-air tank configured to provide the regular compressed-air tanks (17, 18, 21) with compressed-air.
2. A system according to claim 1, characterized in that said relation is at least 1.5:1 or at least 2:1.
3. A system according to claim 1 or 2, characterized in that said at least one high compressed-air tank (10) is configured to contain compressed-air of a pressure exceeding said regular pressure by 50%-600%, at least 100% or at least 200%.
4. A system according to any of the preceding claims, characterized in that the total volume of said high compressed-air tank(s) (10) is at least the same as the total volume of said regular compressed-air tanks (17, 18, 21) or exceeds this total volume by at least 50% or at least 100%.
5. A system according to any of the preceding claims, characterized in that the total volume of said regular compressedair tanks (17, 18, 21) is ? 15 litres, ? 3 litres or 3-1 5 litres per axle of the vehicle.
6. A system according to any of the preceding claims, characterized in that the total volume of said high compressed-air tank(s) (10) is 10-100 litres, 30-100 litres or 40-80 litres.
7. A system according to any of the preceding claims, characterized in that said regular compressed-air tanks (17, 18, 21) are configured to contain compressed-air of a pressure of 7.5-15 bar, 10-13 bar or 12.5 bar.
8. A system according to any of the preceding claims, characterized in that said high compressed-air tank(s) (10) is/are configured to contain compressed-air of a pressure of ? 15 bar, ? 20 bar, 20-60 bar or 30-50 bar.
9. A system according to any of the preceding claims, characterized in that said tanks of the system are configured to contain compressed-air in an amount of 1 bar x m<3>- 3.5 bar x m<3>.
10. A heavy or medium heavy motor vehicle, especially a wheeled motor vehicle, such as a truck or a lorry or a bus, characterized in that it is provided with a compressed-air brake system according to any of claims 1-9.
SE1750146A 2016-03-04 2017-02-16 A compressed-air brake system SE541576C2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1650292A SE1650292A1 (en) 2016-03-04 2016-03-04 A compressed-air brake system

Publications (2)

Publication Number Publication Date
SE1750146A1 SE1750146A1 (en) 2017-09-05
SE541576C2 true SE541576C2 (en) 2019-11-05

Family

ID=59650951

Family Applications (2)

Application Number Title Priority Date Filing Date
SE1650292A SE1650292A1 (en) 2016-03-04 2016-03-04 A compressed-air brake system
SE1750146A SE541576C2 (en) 2016-03-04 2017-02-16 A compressed-air brake system

Family Applications Before (1)

Application Number Title Priority Date Filing Date
SE1650292A SE1650292A1 (en) 2016-03-04 2016-03-04 A compressed-air brake system

Country Status (3)

Country Link
BR (1) BR102017004174A2 (en)
DE (1) DE102017001425A1 (en)
SE (2) SE1650292A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018102764A1 (en) 2018-02-07 2019-08-08 Haldex Brake Products Aktiebolag Brake system for a commercial vehicle, compressed air treatment unit and use of a compressed air conditioning unit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3133963A1 (en) 1981-08-27 1983-03-10 Robert Bosch Gmbh, 7000 Stuttgart PRESSURE BRAKE SYSTEM
SE507378C3 (en) 1996-09-02 1998-06-29 Volvo Lastvagnar Ab Compressed air system for trucks

Also Published As

Publication number Publication date
SE1750146A1 (en) 2017-09-05
SE1650292A1 (en) 2017-09-05
BR102017004174A2 (en) 2017-12-12
DE102017001425A1 (en) 2017-09-07

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