WO2009075658A2

WO2009075658A2 - Innovation in the inner breathing mechanism in the spring brake actuators

Info

Publication number: WO2009075658A2
Application number: PCT/TR2008/000128
Authority: WO
Inventors: Mehmet Hayti; Erhan Kaya
Original assignee: Orsan Ticari Arac Sistemleri Ltd. Sti.
Priority date: 2007-12-11
Filing date: 2008-11-12
Publication date: 2009-06-18
Also published as: WO2009075658A3; WO2009075658A9

Abstract

The invention relates in particular to the inner breathing mechanisms (27) used in the spring brake actuators employed in the brake control systems of the automotive sector, said mechanism comprising the monobloc piston bearing (31) having the piston (1) and the piston pipe (26); the sealing member (4) that prevents the passage of the pressurized air from the rear service room (13) to the rear emergency braking room (15); the spring (3) that enables the sealing member (4) to be pushed; the spring bearing (2); the blind plug (6) that prevents the air contact of the mechanism (27) with the rear service room (13); the stopper (7) that enables the formation of the air circulation zone; the release hole (9) that provides the exchange of air; the air circulation zone (10).

Description

INNOVATION IN THE INNER BREATHING MECHANISM IN THE SPRING BRAKE

ACTUATORS

TECHNICAL FIELD

The invention relates to the spring brake actuators, which provide braking in the brake control systems used in the trucks, buses and similar commercial transport vehicles.

The invention relates in particular to the inner breathing mechanism, which forms a small operation area occupying no significant space in the brake control systems of the automotive sector, provides the reduction of the costs and the practicality of assembly owing to the small number of parts, and comprises the piston, sealing member, spring, stopper, sealing buffer, air release hole, air circulation zone and sealing surface.

STATE OF THE ART

Land transport vehicles such as truck, bus, tractor, etc. used in commercial transportation are indispensable for human life. For this reason, there is a continuous work of improvement being carried out to enable these vehicles to become more efficient, practical and economical.

Since the vehicles in commercial transportation are used for transporting the freight and the people, they are the vehicles with high weights. These vehicles, which are generally made for the long travels, are required to be comfortable to use and safe, and the failures likely to occur must be minimized. The brake systems used in such vehicles are very important for the vehicles. The brake systems of the vehicles are one of the most important factors in preventing the accidents likely to occur. The spring brake actuator is among the most important parts in the brake systems.

In Figure 4, the cross-sectional drawing is provided of an actuator according to the prior art in assembled state, comprising an outer breathing mechanism. As a result of the pressurized air being provided via the vehicle's air line to the front emergency braking side (14), the emergency braking spring (20) is compressed with the aid of the piston (1) and the piston seal (18). The air that is compressed in the rear emergency braking side (15) is conveyed via the rubber elbow (23) connected with the deep body (19),

breather hose (24) and another rubber elbow (25) to the front service braking side (12). The front service braking side (12) is equal to the atmospheric air pressure. When the pressurized air in the front emergency braking side (14) is discharged, the emergency braking spring (20) cocked by the air pushes the piston (11). As a result of this pushing action, as the piston seal (18) is a sealing member, the suction pressure is formed in the rear emergency braking side (15). Said suction pressure is conveyed via the rubber elbow (23) connected with the deep body (19), the breather hose (24) and another rubber elbow (25) to the front service braking side (12). The front service braking side (12) that is open to the atmospheric air pressure will equalize the suction pressure in the rear emergency braking side (15) and becomes equal to the atmospheric pressure.

In the spring brake actuators used according to the state of the art, the inner breathing mechanism occupies a considerable space. Consequently, the increase in the sizes of the diaphragm and the considerably large operating area thereof lead to the high costs.

The inner breather hose used in the spring brake actuators according to the state of the art is located on the outside of the diaphragm, hence it is damaged easily. As a result of the damaged inner breathing mechanism, the rain and dust penetrates into the brake diaphragm, leading to the failure of the entire mechanism. Also, penetration of the rain and dust into the brake diaphragm leads to the corrosion on the emergency braking spring, hence causing the fractures, with the solid particles also resulting in the problems like the abrasion of the emergency braking seal and the loss of the sealing ability.

The process flow is very slow in the manufacture of the inner breathing mechanism used in the spring brake actuators according to the state of the art.

As a result, improvements are sought in the inner breathing mechanism used in the spring brake actuators, and new structures are needed, which would eliminate the aforesaid disadvantages and provide solution for the existing systems. OBJECT OF THE INVENTION

The present invention relates to the inner breathing mechanism used in the spring brake actuators, which satisfies the aforesaid requirements, eliminates all the disadvantages and brings about some additional advantages. r

The object of the invention is to form an inner breathing mechanism, which enables a long service life.

Another object of the invention is to form an inner breathing mechanism, wherein there is less operating space and thus the diaphragm dimensions are enabled to be reduced. There is also formed the inner breathing mechanism, which allows cocking the emergency braking spring in an internal manner and reducing the assembly sizes, thereby enabling lower costs.

Another object of the invention is to boost the manufacturing process flow, thereby achieving higher efficiency, ability to perform economical production and compatibility with the competition environment.

Another object of the invention is to form an inner breathing mechanism, which prevents damage to the spring brake actuator due to the rain and dust.

Still another object of the invention is to form an inner breathing mechanism, which prevents the corrosion and fracture of the emergency braking spring.

Still another object of the invention is to form an inner breathing mechanism, which prevents the abrasion and the impairment of the sealing function of the emergency braking seal.

Still another object of the invention is to form an inner breathing mechanism, which enables a faster production.

In order to achieve all the aforesaid advantages that will be apparent from the following detailed description, the present invention forms the monobloc piston bearing having the piston and piston pipe where the inner breathing mechanism is carried; the sealing member that prevents the passage of the pressurized air from the rear service room to the rear emergency braking room; the spring that enables the sealing member to be pushed when the air is lifted in the rear service room; the spring bearing that enables centering of said spring; the blind plug that prevents the air contact of the mechanism with the rear service room; the air release hole that limits the motion of said sealing member to enable the formation of the air circulation zone and provides the air exchange; the air circulation zone that enables the collection of the air coming from said air release hole; the sealing buffer that provides the air sealing on the sealing surface with the pressurized air coming from the rear service room; the sealing surfaces onto which the sealing buffer leans and where the sealing is provided and the air release clearance that enables the air to pass through said spring bearing to the rear emergency braking room; thus the invention achieves a long service life for the inner breathing mechanism used in the spring brake actuators.

The structural and characteristic features and all the advantages of the invention will be more clearly understood from the figures provided below and the detailed description written with reference to said figures, hence the evaluation must be made taking into consideration these figures and detailed description.

BRIEF DESCRIPTION OF THE FIGURES

In order to best understand the embodiment of the present invention and the advantages thereof along with the additional elements, it must be considered together with the figures for which the description is provided below.

Figure 1 : The representative two dimensional cross-sectional view of the invention.

Figure 2: The representative perspective view of the invention in disassembled state, in which some of the components that constitute the invention are shown.

Figure 3: The representative two dimensional view of the inner breathing mechanism in assembly state inside the spring brake actuator mechanism.

Figure 4: The cross-sectional view of the diaphragm in assembly state according to the prior art, wherein the outer breathing mechanism is included. REFERENCE NUMBERS

1- Piston

2- Spring Bearing

3- Spring 4- Sealing Member

5- O-ring

6- Blind Plug

7- Stopper

8- Sealing Buffer 9- Air Release Hole

10- Air Circulation Zone

11- Sealing Surface

12- Front Service Room

13- Rear Service Room 14- Front Emergency Braking Room 15- Rear Emergency Braking Room 16- Core Seal

17- Internal Cocking System

18- Piston Seal 19- Deep Body

20- Emergency Braking Spring 21- Top Cover

22- Air Release Clearance

23- Rubber Elbow

24- Breather Hose

25- Rubber Elbow

26- Piston Pipe

27- Inner breathing mechanism

28- Spring brake actuator

29- Spring bearing protrusions

30- Spring bearing protrusion ratchets

31- Piston bearing

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the preferred embodiments of the inner breathing mechanism (27) used in the spring brake actuators (28) according to the invention are described only with the aim of providing a better understanding of the subject matter, in a way not leading to any limiting effect.

As a result of the pressurized air being provided from the vehicle's air line to the front emergency braking room (14), the emergency braking spring (20) is compressed with the help of the piston bearing (31) and the piston seal (18). The piston (1) and the piston pipe (26) are combined in a monobloc structure to form the piston bearing (31). Said piston bearing (31) harbors the inner breathing mechanism (27). When said emergency braking spring (20) is compressed, the air that begins to be compressed in the rear emergency braking room (15) advances through the air release clearance (22) on the piston (1) to reach the plastic spring bearing (2). Said spring bearing (2) is made preferably of plastic. Said spring bearing (2) comprises the spring bearing protrusions (29) and spring bearing protrusion ratchets (30). Due to the spring (3) continuously pushing the sealing member (4), the mechanism is open to contact with air. The air advances around the sealing member (4) that is harbored in a spaced manner on the piston bearing (31) to reach the air circulation zone (10). The air, which is conveyed from here to the rear service room (13) via the air release hole (9), is released into the atmosphere by means of the valves of the vehicle system. Said air release hole (9) provides for the air exchange. There is used a blind plug (13), which prevents the air contact with the rear service room (13). It is the o- ring (5) that provides the sealing between said blind plug (6) and the piston bearing (31). Figure-2 shows the representative perspective view of the invention in disassembled state, in which some of the components that constitute the invention are illustrated.

As a result of the air in the front emergency braking room (14) being discharged, the emergency braking spring (20) pushes the piston bearing (31). The piston seal (18) fulfills its duty of sealing to start forming the suction pressure in the rear emergency braking room (15). At the moment the piston bearing (31) starts moving, the air release hole (9) remains under the core seal (16) on the top cover (21). Said top cover (21) is made preferably of aluminum. Since said core seal (16) has a structure with cheeks, it allows the withdrawal of air from the rear service room (13) to ensure the continuity of movement. Once the piston bearing (31) has moved a certain distance, the air release hole (9) is released from the core seal (16). During the initial movement and the subsequent movements, the air enters through the release hole (9) and reaches the air circulation zone (10). In Figure-3, the sealing member (4), which prevents the passage of the pressurized air from the rear service room (13) to the rear emergency braking room (15), is shown. On said sealing member (4), there are located the stopper (7), which limits the movement of the sealing member (4), and the sealing buffer (8), which provides the sealing for the pressurized air coming from the rear service room (14). On the piston bearing (31) seen in Figure-1 and Figure-3, there are located the said air release hole (9), which provides the exchange of air, and the sealing surface (11), onto which the sealing buffer (8) leans and where the sealing is provided. The air advances around the sealing member (4), which is harbored in a spaced manner on the piston bearing (31), to reach the spring bearing (2). Said spring bearing (2) enables the centering of the spring (3). Then the air reaches via the air release clearance (22) to the rear emergency braking room (15). The air flow continues until the actuator (28) has completed its stroke, and upon the completion of the stroke, the pressure in the rear emergency braking room (15) is equalized to the atmospheric pressure by means of the vehicle's valves. In Figure-3, the internal cocking system (17) is shown.

When the pressurized air is supplied from the vehicle's air line to the rear service room (13) during the forward or backward movement of the piston bearing (31), the pressurized air that enters via the air release hole (9) is collected in the air circulation zone (10).

The pressurized air that builds up in this section pushes the sealing member (4) and the spring (3). The duty of said spring (3) is to push the sealing member (4) when the air is lifted from the rear service room (13). As a result of this pushing action, the sealing buffer (8) presses onto the sealing surface (11) and thus the sealing is provided. In this way, the pressurized air coming from the rear service room (13) is prevented from passing to the rear emergency braking room (15).

The invention relates in particular to the inner breathing mechanisms (27) used in the spring brake actuators employed in the brake control systems of the automotive sector, said mechanism comprising a top cover (21); the front emergency braking room (14) and the rear emergency braking room (15) that enable the movement of the pressurized air coming from the vehicle's line; the emergency braking spring (20) that pushes the piston (1) when the air is discharged from said front emergency braking room (14); the o-ring (5) that provides for the sealing; the deep body (19) carrying the rubber elbow (23), the breather hose (24) connected with said rubber elbow (23) and the rubber elbow (25) providing the contact of said breather hose (24) with the front service room (12); the piston (1) and the piston pipe (26), with the said mechanism also comprising the monobloc piston bearing (31), having the piston (1) and the piston pipe (26), where the inner breathing mechanism (27) is harbored; the sealing member (4) that prevents the passage of the pressurized air from the rear service room (13) to the rear emergency braking room (15); the spring (3) that enables the sealing member (4) to be pushed when the air is lifted from the rear service room (13); the spring bearing (2) that enables the centering of the spring (3); the blind plug (6) that prevents the air contact of the mechanism (27) with the rear service room; the air release hole (9) that provides the exchange of air; the air circulation zone (10) that enables the collection of the air coming from said air release hole (9); and the stopper (7) that limits the movement of said sealing member (4) to form the air circulation zone (10). The invention also relates to said mechanism comprising the sealing surface (11) where the sealing is provided; the sealing buffer (8) that provides the air sealing on the sealing surface (11) with the pressurized air coming from the rear service room (13); the air release clearance (22) that enables the air to pass through said spring bearing (2) to reach the rear emergency braking room (15), wherein said spring bearing (2) is made preferably of plastic; and the spring bearing protrusions (29) and the protrusion ratchets (30) that provide the connection of said spring (3) with the piston bearing (31).

The protective scope of this application is determined in the section of the claims, and the scope may by no means be limited to the description above provided only for exemplary purposes. It is obvious that a person skilled in the art may provide the innovation put forward by the invention also by using the similar embodiments and/or may apply this embodiment to the other fields used in the relevant art for similar purposes. Consequently, such embodiments would obviously lack the criteria of innovative step and particularly of exceeding the state of the art.

Claims

1. The invention relates in particular to the inner breathing mechanisms (27) used in the spring brake actuators employed in the brake control systems of the automotive sector, said mechanism comprising a top cover (21); the front emergency braking room (14) and the rear emergency braking room (15) that enable the movement of the pressurized air coming from the vehicle's line; the emergency braking spring (20) that pushes the piston (1) when the air is discharged from said front emergency braking room (14); the o-ring (5) that provides for the sealing; the deep body (19) carrying the rubber elbow (23), the breather hose (24) connected with said rubber elbow (23) and the rubber elbow (25) providing the contact of said breather hose (24) with the front service room (12); the piston (1) and the piston pipe (26) characterized in that it comprises

- the monobloc piston bearing (31), having the piston (1) and the piston pipe (26), where the inner breathing mechanism (27) is harbored;

- the sealing member (4) that prevents the passage of the pressurized air from the rear service room (13) to the rear emergency braking room (15);

- the spring (3) that enables the sealing member (4) to be pushed when the air is lifted from the rear service room (13);

- the spring bearing (2) that enables the centering of said spring (3);

- the blind plug (6) that prevents the air contact of the mechanism (27) with the rear service room;

- the air release hole (9) that provides the exchange of air;

- the air circulation zone (10) that enables the collection of the air coming from said air release hole (9); and - the stopper (7) that limits the movement of said sealing member (4) to form the air circulation zone (10).

2. An inner breathing mechanism for the spring brake actuators according to claim 1 characterized in that it comprises the sealing surface (11) where the sealing is provided.

3. An inner breathing mechanism for the spring brake actuators according to any one of the preceding claims characterized in that it comprises the sealing buffer (8)

4. that provides the air sealing on the sealing surface (11) with the pressurized air coming from the rear service room (13).

5. An inner breathing mechanism for the spring brake actuators according to any one of the preceding claims characterized in that it comprises the air release clearance (22) that enables the air to pass through said spring bearing (2) to reach the rear emergency braking room (15).

6. An inner breathing mechanism for the spring brake actuators according to any one of the preceding claims characterized in that said spring bearing (2) is made preferably of plastic.

7. An inner breathing mechanism for the spring brake actuators according to any one of the preceding claims characterized in that it comprises the spring bearing protrusions (29) that provide the connection of said spring (3) with the piston bearing (31).

8. An inner breathing mechanism for the spring brake actuators according to any one of the preceding claims characterized in that it comprises the spring bearing protrusion ratchets (30) that provide the connection of said spring (3) with the piston bearing (31).