Repair of The Bracket and Clutch Mechanism On Centrifugal Pump For Firefighter Motorcycle

An addition of centrifugal pump on the engine of automatic motorcycles is expected to become one of the solutions for fire incidents in densely populated areas in big cities. Many cases of fire-related incidents have not been handled properly due to limitations of access for fire engines such as narrow alleys. The effectiveness of the centrifugal pump for firefighter motorcycles is determined by the optimum function of the pump performance according to the desired specification. The repair of the brackets and the clutch mechanism for the pump in the engine of automatic motorcycles may assist to the full effectiveness of the pump. The repair is based on the stability of the number of cycle on the centrifugal pump during the cycle of the motorcycle engine without any load. There is no disruption to the motorcycle cruise control or an increase of load due to the addition of centrifugal pump in the motorcycle’s engine. By using the magnetic clutch which uses the electrical energy in the connection and disconnection of the joint, this model will be useful since it does not disrupt the motorcycle cruise performance and does not add an extra load to the motorcycle torso.


Introduction
Densely populated areas that are commonly found in big cities such as Jakarta are the areas in which the incidents of fire are the highest. The most common causes of these fire incidents are short circuits, followed by gas cylinder explosions. Based on the data released by the fire department office in Jakarta, the incidents of fire from January to July 2017 can be seen in the graph as shown in Fugure 1.
From the reference above, that 28-78 fire incidents happened in Jakarta last year and 90% occurred in houses located in densely populated areas. One difficulty that the fire department has to deal with in the cases of fire occurred in densely populated areas is that the fire trucks have limited accesses to the fire location. By adding a centrifugal pump to the motorcycle engine, the firefighter motorcycle is then created and hoped to become one of the applicable solutions to the fire in urban areas [1]. Although the capacity of the centrifugal pump in a motorcycle is still far below the capacity of the centrifugal pump of a fire truck, the dimension of the motorcycle becomes an advantage in the city's narrow alleys. Motorcycles are also easy to ride and maneuver.  The previous research on firefighter motorcycles discusses the installation of the centrifugal pump in the motorcycle by using the manual clutch connected to the axis in the continuously variable transmission (CVT) component of an automatic motorcycle. Therefore, since the cycle of the centrifugal pump follows the CVT cycle in the engine, it is difficult to maintain stability [2]. This burdens the engine when the motorcycle is ridden to the fire location. The use of a magnetic clutch and the improvement in the mechanism of the centrifugal pump are hoped to improve the firefighter motorcycle's performance. The repair of brackets and magnetic clutch mechanism are explained in the sub-chapters below.

Related Works
The increase in the number of houses in urban areas has contributed to the development of densely populated areas in certain areas [3]. The growth of population is proportionate to the increase of energy consumption [4] which results in the increase of fire incidents in the urban areas [5]. Although one solution to this issue which is vertical housing such as apartments and flats has been provided by the government, without a comprehensive solution to the fire incidents, the vertical housing remains high for fire risks [6]. The efforts to prevent fire in the residential areas are influenced by the social conditions of the community and the index living condition (ILC). This was mentioned by Niklas Guldaker [7] for the Malmo Sweden study case. Lopes and Hao [8,9] state that the mitigation of fire is a joint effort between the community and the government as the decision-maker for public policies.
To prevent the loss of lives and materials due to fire in densely populated areas, city planning must be done well [10,11]. This may be done by adding evacuation routes or maps in case of fire as explained by Dian who discusses the fire in densely populated areas in Surabaya. This also applies to public areas such as campuses where students must be aware of the correct locations of the fire equipment and the evacuation routes during fire.
Aside from the social and cultural conditions of the community, the equipment also become a determining factor in the success of the prevention and mitigation of fire [12]. Efforts have been made for the past several years to develop an early detection of fire [13] which allows a quick response for the community during fire. Other means such as the development of fire prevention equipment [14], fire resistant materials [15], until the evolution of the fire trucks [16] have also been developed by researchers. However, all these means are not applicable to certain areas such as densely populated areas since they have not solved the issue of limited access to the areas. One example of problems that need

Research Method
In the beginning, the firefighter motorcycles that have been found in the market use the motorcycle's fuel to move the centrifugal pump. Since this kind of setting requires the motorcycle to provide extra spaces for the centrifugal pump, fuel, and other firefighting equipment, the dimension of the motorcycle becomes larger. In its development, the centrifugal pump in the firefighter motorcycle may be installed in the CVT of the motorcycle using the bracket as the clutch for the centrifugal pump. This, however, creates a complication in the operation. The number of cycle in the centrifugal pump and the volume of water sprayed remains unstable. Therefore, to increase the effectiveness of the centrifugal pump in the firefighter motorcycle, research was conducted, and the flow chart of the research can be seen below:

Repair for Bracket and Clutch Mechanism in the Centrifugal Pump
The equipment used in the firefighter motorcycle can be seen in Table 1 below. The main component of the equipment is the centrifugal pump to spray the water. The volume of the water and the pressure produced by the centrifugal pump must be taken into account carefully in order to avoid adding an extra load to the motorcycle. Siren lamp Also, the bracket must be designed according to the specification of the centrifugal pump used. Table 2 shows the specification of the centrifugal pump used: In the installation of the centrifugal pump, the bracket is used to support the body of the pump and to attach it to the engine which it uses as the main power. For the clutch component, the magnetic model is chosen since its electrical power is used to connect the magnet component. This model is used in many centrifugal pumps and has been patented by Kiker, et al. For the firefighter motorcycle, the Magnetic clutch Type g is used which can be seen below:

Fig. 3. Magnetic Clutch Type g
From the shape of the clutch seen above, it can be seen that the bracket for the pump is adjusted so that it could be placed next to the clutch and connected with a belt with a The repair and the improvement that are done can be seen in Table 3 below: The number of cycles depending on engine rotation 700 rpm on the engine equal with 1400 rpm on the centrifugal pump 2 The stability of the cycles Not stabil stabil 3 The total width of the installed pump 750mm 820mm 4

Construction of centrifugal pump
Coupled with CVT Pulley and belt ratio 2:1 5 The number of spare parts 5 part 8 part The following is the illustration of the water volume test in the firefighter motorcycle after the repair and the improvement.

Discussion and Conclusion
Although the repair of the brackets and the improvement of the clutch mechanism resulted in few modifications such as an addition to the motorcycle part, which is the belt component, and the shift of the centrifugal pump location due to the reduction of cycle used to reach the 1400 cycles during the normal cycle of the engine, there was no increase to the motorcycle load. This is because the magnetic clutch is not needed during cruise time. In the cycle of the centrifugal pump, when the engine is in a low cycle position (700rpm), the pulley and belt mechanism may be used with a 1:2 ratio. The following is the result of the initial trial using the repair of the brackets and the magnetic clutch mechanism in the firefighter motorcycle. The maximum height of the water spray 5 meter 4.1. meter The table above shows that the repair of brackets and the improvement of the clutch mechanism increased the effectiveness of the firefighter motorcycle. The repair and the improvement resulted in an increase effective mechanism of centrifugal pump coupling. With this model, the firefighter motorcycles will no longer have an additional burden at cruise time.