EP1490251A1 - Internally ventilated chamber of spring brake actuator - Google Patents

Internally ventilated chamber of spring brake actuator

Info

Publication number
EP1490251A1
EP1490251A1 EP02756063A EP02756063A EP1490251A1 EP 1490251 A1 EP1490251 A1 EP 1490251A1 EP 02756063 A EP02756063 A EP 02756063A EP 02756063 A EP02756063 A EP 02756063A EP 1490251 A1 EP1490251 A1 EP 1490251A1
Authority
EP
European Patent Office
Prior art keywords
piston
air
spring
brake actuator
spring brake
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.)
Withdrawn
Application number
EP02756063A
Other languages
German (de)
French (fr)
Inventor
Ahmet Organize Sanayi Bolgesi Arkan
Serkan Organize Sanayi Bolgesi Bilsen
Ahmet Organize Sanayi Bolgesi Akin
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.)
Arfesan Arkan Fren Elemanlari Sanayi ve Ticaret AS
Original Assignee
Arfesan Arkan Fren Elemanlari Sanayi ve Ticaret AS
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 Arfesan Arkan Fren Elemanlari Sanayi ve Ticaret AS filed Critical Arfesan Arkan Fren Elemanlari Sanayi ve Ticaret AS
Publication of EP1490251A1 publication Critical patent/EP1490251A1/en
Withdrawn legal-status Critical Current

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
    • B60T17/08—Brake cylinders other than ultimate actuators
    • B60T17/083—Combination of service brake actuators with spring loaded brake actuators

Definitions

  • the present invention is about diaphragm / piston spring brake actuators used in vehicles such as trucks, busses and trailers.
  • the present invention aims to decrease actuator failures by the utilization of an internal ventilation system in the diaphragm / piston spring brake actuators.
  • Spring brake actuator which provides braking power for highway vehicles such as trucks, busses and trailers used in commercial transportation, consists of a “service brake chamber” used when the vehicle is in action and a “spring chamber” used when the vehicle is parked.
  • the Service Brake Chamber and the Spring Chamber in spring brake actuators operate with pressurized air coming from different lines and are controlled by various valves in the cab.
  • breather tube (4) An external connection called breather tube (4) is used In the diaphragm / piston spring brake actuators produced according to prior art in order to transfer the compressed and expanded air that occurs in the piston rear area (18) due to the forward and backward movement of the piston (18) to directions (a) and (b), and in order to decrease the effect of the air.
  • the breather tubes (4) in the conventional diaphragm / piston spring brake actuators produced according to prior art are connected to the sheet metal body by rubber connectors called rubber elbow (20 and 21).
  • rubber elbow (20 and 21) When the piston (1) moves to direction (b) air from the atmospheric area (19) is admitted to the piston rear area via the breather tube (4).
  • the atmospheric area (19) is opened to the external environment by a ventilation hole. Dust and moisture is allowed from the ventilation hole together with air.
  • dust and moisture are carried to the piston rear area via the breather tube (4).
  • Moisture causes corrosion particularly in the power spring (25) and dust gradually harms the sealing (15) and guide ring (23) which are sealing elements (22).
  • the rubber elbows (20, 21) are damaged in time due to atmospheric conditions and the connection loosens. It is also common that due to vibration or to the stones on the road bouncing up, the connection gets damaged and any end of the breather tube is opened to atmosphere. If the connection is damaged, water, dust and mud are allowed in the piston rear area (18), causing abrasion of the guide ring (23) and the sealing element (22) and sealing is harmed. Moreover, water and abrasives in the vehicle causes the power spring (25), whose duty is to keep the vehicle parked, to rust and to get damaged sooner. If such a situation occurs, the spring brake actuator, which is of vital importance, needs to be repaired or replaced immediately.
  • an internal ventilation system is used to completely insulate the spring chamber of the actuator from atmosphere and the entry of the contaminants in the actuator is prevented.
  • the ventilation of the piston rear area is provided with dry air in the ventilation system of the vehicle. Therefore, it becomes impossible for the external contaminants and moisture to damage the actuator.
  • the internally ventilated diaphragm / piston spring brake actuator which is the subject of this invention, consists of main members such as aluminum piston (1), aluminum pipe (2), spring chamber (3), service chamber (5), piston valve (6), piston valve O-ring (8), piston valve steel ball (9), exhaust hole (10), air entry hole (11), air passage (12), plug (13), air entry holes (14), sealing (15), exhaust bore (16), pressurized air O-ring (17).
  • Piston valve (6) is made of brass to avoid rusting. It is bolted and screwed to the aluminum piston (1).
  • O-ring (8) in the piston valve (6) is made of a rubber based material and is firmly placed in the inner surface of the piston valve (6).
  • the piston valve steel ball has been chosen for its standard and smooth surface quality.
  • the steel ball (9) is placed on the O-ring (8) with pressurized air, therefore the air passage (12) is closed and sealing is achieved in the piston valve.
  • the spring (7) in the valve relocates the ball and is made of stainless spring steel.
  • the sealing (15) in the aluminium plug (13) is made of a rubber based material which operates as a one way valve in this design.
  • the O-ring (17) used in the plug (13) outlet serves for further safety and avoids strains in the sealing (15) that occurs by pressure in the adverse direction.
  • the aluminium piston (1) and the aluminium pipe (2) screwed to it are guided and move freely.
  • This system shall hereinafter be referred to as the piston.
  • the spring chamber (3) starts to be filled with pressurized air from the air tanks of the vehicle.
  • the steel ball (9) of the piston valve (6) compresses the spring (7) and sits on the O-ring (8).
  • the piston blocks the valve (6) and sealing is achieved.
  • the piston moves in direction (a), and causes the air in the piston rear area (18) to be compressed.
  • the compressed air is transferred from the air passage (24) into the plug (13) area. Air enters the plug through the entry holes (12), opens the sealing (15) and reaches the exhaust bore (16). Pressurized air opens the O- ring (17) and is released to the service chamber (5).
  • the compressed air is released to atmosphere since the service chamber (5) is open to atmosphere through various valves, which differ according to systems.
  • the piston (1) moves in direction (b) due to the force of the power spring (25) and causes a partial vacuum in the piston rear area (18).
  • the piston valve (6) opens the vacuum to the atmosphere as follows:
  • force acting on the ball (9) drops to atmospheric pressure; meanwhile, the ball (9) moves with the help of the compressed spring (7) and leaves the O-ring (8), on which it was sitting ; when the air is admitted through this passage (12), the piston rear area (18) reaches atmospheric pressure.

Landscapes

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

Abstract

The present invention aims to decrease actuator failures by the utilization of an internal ventilation system in the diaphragm / piston spring brake actuators used in vehicles such as trucks, busses and trailers. The internally ventilated diaphragm / piston spring brake actuator consists of the following main elements: aluminum piston (1), aluminum pipe (2), spring chamber (3), service chamber (5), piston valve (6), piston valve O-ring (8), piston valve steel ball (9), exhaust hole (10), air entry hole (11), air passage (12), plug (13), air entry holes (14), sealing (15), exhaust bore (16), pressurized air O-ring (17).

Description

INTERNALLY VENTILATED CHAMBER OF SPRING BRAKE ACTUATOR
The present invention is about diaphragm / piston spring brake actuators used in vehicles such as trucks, busses and trailers. The present invention aims to decrease actuator failures by the utilization of an internal ventilation system in the diaphragm / piston spring brake actuators.
Spring brake actuator, which provides braking power for highway vehicles such as trucks, busses and trailers used in commercial transportation, consists of a "service brake chamber" used when the vehicle is in action and a "spring chamber" used when the vehicle is parked.
The Service Brake Chamber and the Spring Chamber in spring brake actuators operate with pressurized air coming from different lines and are controlled by various valves in the cab.
The attached figures for a better understanding of the diaphragm / piston spring brake actuators developed by this invention and the brake actuators produced according to prior art are as follows:
Figure 1 - Sectional view of the internally ventilated diaphragm / piston spring brake actuator developed by this invention
Figure 2 - Sectional view of the diaphragm / piston spring brake actuator produced according to the prior art
Figure 3 - Sectional view of the plug Figure 4 - Sectional view of the valve
The parts shown in the attached figures for a better understanding of the diaphragm / piston spring brake actuator developed by this invention are given numbers. The definition for the numbered parts are as follows:
I -Aluminium piston 2 - Aluminium pipe
3 - Spring chamber
4 - Breather tube (external ventilation tube) 5 - Service chamber
6 - Piston valve
7 - Spring
8 - O-ring
9 - Ball 10 - Exhaust hole
I I - Air entry hole 12 - Air passage - 13 - Internal ventilation plug 14 - Air entry hole 15 - Sealing 16 - Exhaust bores 17 - O-Ring
18 - Piston rear area
19 - Atmospheric area
20 - Rubber elbow
21 - Rubber elbow 22 - Sealing element
23 - Guide ring
24 - Air passage
25 - Power spring
An external connection called breather tube (4) is used In the diaphragm / piston spring brake actuators produced according to prior art in order to transfer the compressed and expanded air that occurs in the piston rear area (18) due to the forward and backward movement of the piston (18) to directions (a) and (b), and in order to decrease the effect of the air.
The breather tubes (4) in the conventional diaphragm / piston spring brake actuators produced according to prior art are connected to the sheet metal body by rubber connectors called rubber elbow (20 and 21). When the piston (1) moves to direction (b) air from the atmospheric area (19) is admitted to the piston rear area via the breather tube (4). The atmospheric area (19) is opened to the external environment by a ventilation hole. Dust and moisture is allowed from the ventilation hole together with air. When the piston (1) moves to direction (b) dust and moisture are carried to the piston rear area via the breather tube (4). Moisture causes corrosion particularly in the power spring (25) and dust gradually harms the sealing (15) and guide ring (23) which are sealing elements (22).
Furthermore, the rubber elbows (20, 21) are damaged in time due to atmospheric conditions and the connection loosens. It is also common that due to vibration or to the stones on the road bouncing up, the connection gets damaged and any end of the breather tube is opened to atmosphere. If the connection is damaged, water, dust and mud are allowed in the piston rear area (18), causing abrasion of the guide ring (23) and the sealing element (22) and sealing is harmed. Moreover, water and abrasives in the vehicle causes the power spring (25), whose duty is to keep the vehicle parked, to rust and to get damaged sooner. If such a situation occurs, the spring brake actuator, which is of vital importance, needs to be repaired or replaced immediately. In the internally ventilated diaphragm / piston spring brake actuator, which is the subject of this invention, an internal ventilation system is used to completely insulate the spring chamber of the actuator from atmosphere and the entry of the contaminants in the actuator is prevented. The ventilation of the piston rear area is provided with dry air in the ventilation system of the vehicle. Therefore, it becomes impossible for the external contaminants and moisture to damage the actuator.
The internally ventilated diaphragm / piston spring brake actuator, which is the subject of this invention, consists of main members such as aluminum piston (1), aluminum pipe (2), spring chamber (3), service chamber (5), piston valve (6), piston valve O-ring (8), piston valve steel ball (9), exhaust hole (10), air entry hole (11), air passage (12), plug (13), air entry holes (14), sealing (15), exhaust bore (16), pressurized air O-ring (17).
Piston valve (6) is made of brass to avoid rusting. It is bolted and screwed to the aluminum piston (1). O-ring (8) in the piston valve (6) is made of a rubber based material and is firmly placed in the inner surface of the piston valve (6). The piston valve steel ball has been chosen for its standard and smooth surface quality. The steel ball (9) is placed on the O-ring (8) with pressurized air, therefore the air passage (12) is closed and sealing is achieved in the piston valve. The spring (7) in the valve relocates the ball and is made of stainless spring steel. The sealing (15) in the aluminium plug (13) is made of a rubber based material which operates as a one way valve in this design. The O-ring (17) used in the plug (13) outlet serves for further safety and avoids strains in the sealing (15) that occurs by pressure in the adverse direction.
In the following explanations of the invention, the aluminium piston (1) and the aluminium pipe (2) screwed to it are guided and move freely. This system shall hereinafter be referred to as the piston.
Once air is allowed in the spring chamber (3), the spring chamber (3) starts to be filled with pressurized air from the air tanks of the vehicle. With the help of pressure the steel ball (9) of the piston valve (6) compresses the spring (7) and sits on the O-ring (8). Thus the piston blocks the valve (6) and sealing is achieved. Due to the pressure formed in the spring chamber, the piston (1) moves in direction (a), and causes the air in the piston rear area (18) to be compressed. The compressed air is transferred from the air passage (24) into the plug (13) area. Air enters the plug through the entry holes (12), opens the sealing (15) and reaches the exhaust bore (16). Pressurized air opens the O- ring (17) and is released to the service chamber (5). Meanwhile, the compressed air is released to atmosphere since the service chamber (5) is open to atmosphere through various valves, which differ according to systems. When the air in the spring chamber (3) is released when the vehicle is parked, the piston (1) moves in direction (b) due to the force of the power spring (25) and causes a partial vacuum in the piston rear area (18). The piston valve (6) opens the vacuum to the atmosphere as follows: When the air in the spring chamber (3) is released, force acting on the ball (9) drops to atmospheric pressure; meanwhile, the ball (9) moves with the help of the compressed spring (7) and leaves the O-ring (8), on which it was sitting ; when the air is admitted through this passage (12), the piston rear area (18) reaches atmospheric pressure.
In the internally ventilated diaphragm / piston spring brake actuator, which is the subject of this invention, contaminants, dust, water, and abrasives entering in the piston rear area from the openings formed in the rubber elbows (20, 21) or due to the breather tube (4) that gets dislocated or that snaps out of place due to various reasons, and drawn inside with the motion of the piston (1) in direction (b) do not get into the actuator. Thus, corrosion and rusting in the actuator and of the power spring (25), and abrasion of the sealing element (22) and the guide ring (23) is prevented and their functionality maintained.

Claims

CLAIMS - Internally ventilated diaphragm / piston spring brake actuator characterized by the prevention of the entry of various contaminants and abrasives into the actuator, thereby preventing corrosion and rusting in the actuator and the power spring (25), and maintaining the functionality of the sealing element (22) and the guide ring (23) by preventing the abrasion thereof; consisting of the main elements such as the aluminum piston (1), aluminum pipe (2), spring chamber (3), service chamber (5), piston valve (6), piston valve O-ring (8), piston valve steel ball (9), exhaust hole (10), air entry hole (11), air passage (12), plug (13), air entry holes (14), sealing (15), exhaust bore (16), pressurized air O-ring (17). - According to Claim 1 , internally ventilated diaphragm / piston spring brake actuator characterized by a piston valve (6) made of brass and screwed to the aluminum piston (1) by the help of bolts on the piston valve. - According to Claims 1 or 2, internally ventilated diaphragm / piston spring brake actuator characterized by an O-ring (8) in the piston valve (6) made of a rubber based material and placed firmly in the inner surface of the piston valve (6). - According to Claims 1 , 2 or 3, internally ventilated diaphragm / piston spring brake actuator characterized by the blockage of the air passage (12) due to fact that the piston valve ball (9) sits on the O-ring (8) by the help of the pressurized air and sealing achieved in the piston valve. - According to Claims 1, 2, 3, or 4, internally ventilated diaphragm / piston spring brake actuator characterized by a spring (7) in the valve made of stainless spring steel relocating the ball (9) to its first position. - According to Claims 1, 2, 3, 4 or 5, internally ventilated diaphragm / piston spring brake actuator characterized by a sealing (15) in the aluminum plug (13) made of a rubber based material and operating as a one way valve. - According to Claims 1, 2, 3, 4, 5, or 6, internally ventilated diaphragm / piston spring brake actuator characterized by further safety by the use of an O-ring (17) in the plug (13) outlet, avoiding strains in the sealing (15) that occurs by pressure in the adverse direction. - According to Claims 1, 2, 3, 4, 5, 6 or 7, internally ventilated diaphragm / piston spring brake actuator characterized by an aluminum piston (1) and an aluminum pipe (2) screwed to it, which are guided, and which move freely. - According to Claims 1, 2, 3, 4, 5, 6, 7 or 8, internally ventilated diaphragm / piston spring brake actuator characterized by air allowed in the spring chamber (3) filling the spring chamber (3) with pressurized air from the air tanks of the vehicle, and with the help of pressure the steel ball (9) of the piston valve (6) compressing the spring (7) and sitting on the O-ring (8), thus the piston blocking the valve (6) and sealing achieved. 0- According to Claims 1, 2, 3, 4, 5, 6, 7, 8 or 9, internally ventilated diaphragm / piston spring brake actuator characterized by the piston (1) moving in direction (a) due to the pressure formed in the spring chamber, causing the air in the piston rear area (18) to be compressed, after which the compressed air is transferred from the air passage (24) into the plug (13) area, and air enters the plug through the entry holes (12), opens the sealing (15) and reaches the exhaust bore (16). 1- According to Claims 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, internally ventilated diaphragm / piston spring brake actuator characterized by the O-ring (17) opened by the pressurized air, which is released to the service chamber (5) while the compressed air is also released to atmosphere since the service chamber (5) is open to atmosphere through various valves, which differ according to systems. - According to Claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11, internally ventilated diaphragm / piston spring brake actuator characterized by the air in the spring chamber (3) released when the vehicle is parked, moving the piston (1) in direction (b) due to the force of the power spring (25) causing a partial vacuum in the piston rear area (18) and the opening of this vacuum to the atmosphere through the piston valve (6). - According to Claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, internally ventilated diaphragm / piston spring brake actuator characterized by pressure acting on the ball (9) dropping to atmospheric pressure with the release of the air in the spring chamber (3), and the ball (9) moving with the help of the compressed spring (7) and leaving the O-ring (8), on which it was sitting; and the air admitted through this passage (12) causing the piston rear area (18) to reach atmospheric pressure.
EP02756063A 2002-03-21 2002-07-17 Internally ventilated chamber of spring brake actuator Withdrawn EP1490251A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
TR200200761 2002-03-21
TR200200761 2002-03-21
PCT/TR2002/000035 WO2003080417A1 (en) 2002-03-21 2002-07-17 Internally ventilated chamber of spring brake actuator

Publications (1)

Publication Number Publication Date
EP1490251A1 true EP1490251A1 (en) 2004-12-29

Family

ID=28450350

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02756063A Withdrawn EP1490251A1 (en) 2002-03-21 2002-07-17 Internally ventilated chamber of spring brake actuator

Country Status (3)

Country Link
EP (1) EP1490251A1 (en)
AU (1) AU2002321981A1 (en)
WO (1) WO2003080417A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2416010A (en) * 2004-07-08 2006-01-11 Haldex Brake Products Ltd Brake actuator
US20130032437A1 (en) 2008-01-02 2013-02-07 Arfesan Arkan Fren Elemanlari Sanayi Ve Ticaret A.S. Internal Ventilation Diaphragm Piston Brake Actuator
DE102008047633A1 (en) 2008-09-17 2010-04-15 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Combined service brake and spring brake cylinder with consisting of a guide ring and at least one sealing element sealing arrangements
DE102008060912B4 (en) * 2008-12-06 2013-11-21 Haldex Brake Products Gmbh Pneumatic brake system with a parking valve
KR101539892B1 (en) * 2014-07-11 2015-07-28 (주)지앤피오토모티브 Brake Chamber Having Sealing Structure for Internal Air Circulation
CN113784879B (en) * 2019-05-16 2024-05-03 采埃孚商用车***欧洲有限公司 Piston tube assembly for a spring brake actuator and spring brake actuator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814874A1 (en) * 1978-04-06 1979-10-18 Bosch Gmbh Robert SPRING STORAGE CYLINDERS, IN PARTICULAR SPRING STORAGE BRAKE CYLINDERS FOR ROAD VEHICLES
EP0025559B1 (en) * 1979-09-12 1984-03-21 Knorr-Bremse Ag Ventilating device for a spring brake actuator, more especially a combined service and spring brake actuator
DE3241548A1 (en) * 1982-11-10 1984-05-10 Robert Bosch Gmbh, 7000 Stuttgart Combined compressed-air spring brake cylinder II
DE19543593A1 (en) * 1995-11-23 1997-05-28 Wabco Gmbh Working cylinder
DE19935628A1 (en) * 1999-07-29 2001-02-01 Wabco Gmbh & Co Ohg Piston-cylinder-unit for brake systems in motor vehicles has secondary chamber sealed relative to atmosphere, and closeable connection between spring chamber and release chamber

Non-Patent Citations (1)

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Title
See references of WO03080417A1 *

Also Published As

Publication number Publication date
WO2003080417A1 (en) 2003-10-02
AU2002321981A1 (en) 2003-10-08

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