DESC:[001] The present invention relates to a parking brake and method of manufacturing thereof. Particularly, it relates to parking brake system for automobile.
[002] It is necessary to implement BSVI vehicles in India as well as in the globe. Therefore, the implementation of advanced cost effective technologies in automobile sectors may require to upgrade the vehicle configuration and packaging and also configuration and packaging are the major issued for heavy commercial vehicles.
[003] The braking system of the vehicles are undergoing continuous development and improvement. The advancement of braking system is important technology is most likely to be applied to heavy-duty vehicles such as buses or trucks or commercial vehicles, which required a specific attention to brake control since the characteristics of a typical pneumatic brake system of a heavy vehicle is inherently nonlinear with large uncertainties.
[004] In the current scenario, service brake and hand brake parking are used to stop and park the vehicle. The service brake is used to stop or park the vehicle in static or dynamic condition. Where parking brakes or hand brakes are used to park the vehicles at a certain condition. But when there is a need for parking the vehicle at almost higher gradient or overload condition, parking brake force for such condition required more parking force to required parking efficiency of the vehicles. The conventional method used to apply the parking brake only by the brake actuator. The efficiency of the parking brake can be increased by increasing the size of the brake actuator. But at some instance, the packaging of the brake actuator is difficult, due to increase sized of the brake actuator. Also due to spring force is very limited cause vehicle rolls back.
[005] Therefore there is a need to develop a system that provides ease parking of the vehicles over a tough or terrain or uneven operational condition.
DESCRIPTON OF THE PRESENT SUBJECT MATTER
[006] The present subject matter solves the aforementioned and other problems by providing the more parking brake system and method to increase the parking brake efficiency of the heavy commercial vehicles. This system also helps in improving the vehicle stability while parking the vehicles on the certain gradient conditions and also in uneven loading condition.
[007] In general, the present invention belongs to the field of parking brake system for commercial vehicles, in particular, it relates to pneumatic parking brake system with advance safety feature for commercial vehicles to improve the parking brake efficiency of the commercial vehicles.
[008] The present invention relates to the system and method of advance safety feature of the vehicles, where vehicles required to park at a very high gradient condition and uneven loading condition like mining sites or hilly terrain areas.
[009] The present invention relates to a pneumatic parking brake system for a heavy commercial vehicles comprising a service brake assists the pneumatic parking brake to have additional braking force available for parking of overloading heavy commercial vehicle on terrain or uneven path in an adverse condition and a relay valve located near to rear brake chambers being used in the assisting the parking brake of the commercial vehicles. . Here chamber force of service brake act as add-on advanced safety feature to the pneumatic parking brake system to make pneumatic parking brake system to work in adverse situations. Further the relay valve is installed near to the rear brake chambers and configured to engage with pneumatic parking brake system through a connecting pipe.
[0010] The pneumatic parking brake system of present invention further comprises a double check valve unit used in an air brake system to direct a flow of air into a common line from either of two sources having higher pressure is having two inlets and outlets port. The two inlets and one outlet port of double valve unit is having 2 inlet connection, one inlet connection is from outlet port of relay valve 2 and one inlet is from front modulator outlet. The pneumatic parking brake system further comprises 3/2 valve of pneumatic parking brake system. The 3x2 valve of pneumatic parking brake as claimed in claim 7, wherein 3x2 valve pilot signal operated spring return valve is a type of standard mechanical valve that, when activated under pressure, opens a valve under positive air pressure.
[0011] In another embodiment, the present subject matter discloses working mechanism of pneumatic brake work on the principal of releasing as well as utilizing air for application of the parking brake. The driver applies parking brake air signal from hand control valve is given to the relay valve hence air filled in the port no 12 of actuator. Further when the driver release parking brake air is released directly from exhaust port of relay valve, thereby reducing brake lag.
[0012] Further the working mechanism of parking brake system of present invention is explain by the way of mechanism wherein foot valve is depressed, thereby air pressure in the control line acts on the top section of the relay valve resulting relaying reservoir air directly to the rear brake chambers through the larger diameter pipe. The pressure of the reservoir air delivered in this way is equal to the pressure delivered by the foot valve. Further releasing of the foot valve exhausts the control air to the relay valve, allowing it to cut off the flow of reservoir air to the rear chambers. This in turn exhausts the air in the brake chambers by the quick release feature of the relay valve.
[0013] In one embodiment, the present invention relates to a system and a method of assisting the pneumatic parking brake of the commercial vehicles, still more particularly relates to supply more parking force to stop the vehicles at certain gradient condition.
[0014] The present subject matter relates to assisting the pneumatic parking brake system with advance safety feature enabled for ease parking of the vehicle in any type of gradient condition, soft soil, over load and hilly terrain areas. To illustrate the Parking Brake assist with advance safety feature as below:
[0015] The present subject matters provide the advance safety feature of the vehicles braking system, in which service brake assists the parking brake to add on braking force available for parking provides additional braking to the parking brake. The advanced safety feature may add on chamber force of service brake to parking brake making it enable to work in adverse situations.
[0016] The present subject matters provide the advance safety feature of the vehicles during parking condition, which works on principal of releasing as well as utilizing air for application of the parking brake.
[0017] The present invention based on advance safety feature for brake system of the vehicle, more particularly the pneumatic brake system of the vehicle provides more parking brake force to increase the parking brake efficiency of the vehicles. The present subject matter is directed towards the relay valve used in the assisting the parking brake of the commercial vehicles. The foot valve is usually located closer to the front wheels than to the rear wheels. The longer the distance from the foot valve to the rear chambers, the more time it will take before the rear brakes apply. This is known as brake lag. To correct this condition on a long wheel base vehicle the relay valve is installed near the rear brake chambers. A larger diameter pipe is connected between the main reservoir and the relay valve. The air line from the foot valve to the relay valve now becomes a “control line.” (The air in the control line “dead ends” at the relay valve) When the foot valve is depressed, the air pressure in the control line acts on the top section of the relay valve, relaying reservoir air directly to the rear brake chambers through the larger diameter pipe. The pressure of the reservoir air delivered in this way will be the same as the control pressure delivered by the foot valve. Releasing the foot valve exhausts the control air to the relay valve, allowing it to cut off the flow of reservoir air to the rear chambers. This in turn exhausts the air in the brake chambers by the quick release feature of the relay valve.
[0018] In another embodiment, the present invention is direct towards parking brake relay valve. When the Driver applies parking brake air signal from hand control valve is given to the relay valve hence air filled in the port no 12 of actuator. When the driver release parking brake air is released directly from exhaust port of Relay Valve, hence reducing brake lag.
[0019] Another embodiment of present invention is directed toward the double check valve unit of pneumatic parking brake system. The double check valves are used in an air brake system to direct a flow of air into a common line from either of two sources, whichever is at the higher pressure. There are two inlets and one outlet port. Out of 2 inlet connection, one inlet connection is from outlet port of Relay Valve 2and one inlet is from front modulator outlet.
[0020] Further aspect of the present invention is directed towards the 3/2 valve of pneumatic parking brake system. A 3x2 pilot signal operated spring return valve is a type of standard mechanical valve that, when activated under pressure, opens a valve under positive air pressure. In standard industrial applications, they have been used for many years as a type of on/off switch for pneumatically powered systems. These pilot valves are generally used to operate actuators (cylinders, pressure operated valves). They have 3 pipe connections & 2 positions.
[0021] In yet another aspect of the present invention When the driver applies hand brake, Air from brake actuator (R1 & R2 Axle) is released through Relay Valve 1 exhaust port and simultaneously 3/2 valve port no. 1 (Reservoir connection) & 2 (Outlet to front brake chamber) get connected, thus air is supplied as a signal to Relay Valve 2, Outlet of Relay Valve 2will be the inlet of Double Check Valve and Outlet of Double check valve will be available at Brake Chamber. Therefore the Brake is applied in F1 Brake Assembly as well.
[0022] The present subject matter relates to a parking brake system with advance safety feature by providing additional braking force assisting by the services brake of the commercial vehicles simultaneously.
BRIEF DESCRIPTION OF DRAWINGS
[0023] Aspects of the present disclosure are illustrated by way of example(s), and not by way of limitation, in the accompanying drawings, wherein:
[0024] FIG. 1 is a layouts of parking system.
[0025] FIG. 2 shows the schematic working diagram of parking system.
DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
[0026] The present invention belongs to the field of pneumatic parking brake system of the commercial vehicles with advance safety feature. Pneumatic parking brake assist with advance safety feature for commercial vehicles, in particular it relates to the providing more parking brake force to improve the parking brake efficiency of the vehicles.
[0027] Referring to FIG. 1 illustrated configuration and layout design of pneumatic parking brake system with advance safety feature for commercial vehicles. During the parking brake application, brakes are applied in rear axle brake actuator R1 and rear axle brake actuator R2 and air got released from the brake actuators during the operation hence parking is applied by the spring force of brake actuators.
[0028] It is illustrated from the above drawing, when the parking brake lever is put ON, Front axle brake chamber F1 will also get activated and simultaneously air got inserted in the front axle F1 along with the rear axle brake actuator R1 and rear axle brake chamber R2 and air got inserted in the from the Front axle chamber F1 and hence brakes applies to the all axles. All wheel brakes will get apply the once when the parking brake in ON. This will increase the brake force. This is achieved by using the additional double check valve, 3/2 valve,
[0029] Referring to FIG. 2 in the above drawing, when the driver applies hand brake, air from rear axle brake actuator R1 and rear brake actuator R2 is released through relay valve 1 exhaust port and simultaneously get into the 3/2 valve port number 1 connected to the main air reservoir & 2 front brake chamber get connected, thus air is supplied as a signal to relay valve 2, outlet of relay valve 2 will be the inlet of double check valve and outlet of double check valve will be available at brake chamber. Therefore the brake is applied in F1 brake assembly, as well.
[0030] In double check valve, there are 2 inlet port and one outlet port. The out of 2 inlet connection, one inlet connection is from outlet port of relay valve 2 and one inlet is from front modulator outlet. The double check valves are used in an air brake system to direct a flow of air into a common line from either of two sources, whichever is at the higher pressure. In High pressure, the double check valve higher of the 2 inlet will pass on outlet. When the driver apply Parking Brake and Service Brake simultaneously, only one inlet (which has high pressure) out of two will go as an outlet of Double Check Valve into brake chamber. 2. When the Driver apply only Parking Brake, there is only outlet of Relay Valve 2available at Double Check Valve, hence F1 brake will be actuated when parking is actuated.
[0031] A 3x2 pilot signal operated spring return valve is a type of standard mechanical valve that, when activated under pressure, opens a valve under positive air pressure. In standard industrial applications, they have been used for many years as a type of on/off switch for pneumatically powered systems. These pilot valves are generally used to operate actuators (cylinders, pressure operated valves).
,CLAIMS:We claim:

1) A pneumatic parking brake system for a heavy commercial vehicles comprising :
a) a service brake assists the pneumatic parking brake to have additional braking force available for parking of overloading heavy commercial vehicle on terrain or uneven path in an adverse condition; and
b) a relay valve located near to rear brake chambers being used in the assisting the parking brake of the commercial vehicles.
2) A pneumatic parking brake system for the heavy commercial vehicles as claimed in claim 1, wherein a chamber force of service brake act as add-on advanced safety feature to the pneumatic parking brake system to make pneumatic parking brake system to work in adverse situations.
3) A pneumatic parking brake system for the heavy commercial vehicles as claimed in claim 1, wherein the relay valve is installed near to the rear brake chambers and configured to engage with pneumatic parking brake system through a connecting pipe.
4) A pneumatic parking brake system for the heavy commercial vehicles as claimed in claim 1, further comprises a double check valve unit having two inlets and outlets port.
5) The double check valve unit as claimed in claim 4, wherein double check valve unit is used in an air brake system to direct a flow of air into a common line from either of two sources having higher pressure.
6) The two inlets and one outlet port of double valve unit as claimed in claim 4, wherein out of 2 inlet connection, one inlet connection is from outlet port of relay valve 2 and one inlet is from front modulator outlet.
7) A pneumatic parking brake system for heavy commercial vehicles as claimed in claim 1, further comprises 3/2 valve of pneumatic parking brake system.
8) The 3x2 valve of pneumatic parking brake as claimed in claim 7, wherein 3x2 valve pilot signal operated spring return valve is a type of standard mechanical valve that, when activated under pressure, opens a valve under positive air pressure.
9) The pneumatic parking brake as claimed in claim 1, wherein pneumatic brake work on the principal of releasing as well as utilizing air for application of the parking brake. The driver applies parking brake air signal from hand control valve is given to the relay valve hence air filled in the port no 12 of actuator. Further when the driver release parking brake air is released directly from exhaust port of relay valve, thereby reducing brake lag.
10) The pneumatic parking brake as claimed in claim 9, wherein foot valve is depressed, thereby air pressure in the control line acts on the top section of the relay valve resulting relaying reservoir air directly to the rear brake chambers through the larger diameter pipe. The pressure of the reservoir air delivered in this way is equal to the pressure delivered by the foot valve. Further releasing of the foot valve exhausts the control air to the relay valve, allowing it to cut off the flow of reservoir air to the rear chambers. This in turn exhausts the air in the brake chambers by the quick release feature of the relay valve.