The unique feature of an active suspension system is the existence of an actuator between car body and bogie trucks, both pneumatic and oil hydraulic. What are the reasons behind using rocker bogie suspensions. A truck suspension comprising a frame, a first bogie wheel supporting truck including a first sleeve, a second bogie wheel supporting truck including coaxial second and third sleeves extending in spaced relation to each other at a distance at least as great as the axial length of said first sleeve, means pivotally mounting said first and second trucks. Description of triaxle straight trucks with his systems. Design and implementation of a rockerbogie suspension for. A rocker bogie suspension consists of linkages on either side of the base that pivot or rock in response to terrain features and bogie, which is a linkage with drive. Agricultural hybrid truck that use a rockerbogie suspension system. Bogie frame bolster of wap 4 locos this flexi coil bogie marki has two stages of vertical suspension in which helical spring have been used at primary and secondary stages.
Pdf modelling and characteristic analysis of triaxle trucks with. The challenge posed by mer was to design a lightweight rockerbogie suspension that would permit the mobility to stow within the limited space available and deploy into a configuration that the rover could then safely use to egress from the lander and explore the martian. The main focus of this chapter are the bogie features that are directly or indirectly related to the axlebox application. Volvos articulated haulers are built for tough reallife conditions. This system allows for better maneuverability both during motion and in place. The dana spicer axle can only be used with the voas rear suspension.
What are the reasons behind using rocker bogie suspensions in. The suspension system stiffness target was one that would produce a translational impact load no greater than 6 gs and not let the rover body deflect below a 20 cm ground height. Each of the rovers six wheels has an independent motor. The rocker bogie suspension system from last year remains relatively the same from last year. Volvo dynamic steering is now available for all axle configurations, including trucks with dual front axles. It features simple, sturdy, and durable structure, and is in normal height. Suspension system for special and heavy weight transport applications operating in especially rough terrain. The rocker bogie suspension system, which was specifically designed for space exploration vehicles have deep history embedded in its development. One bogie contain three axle, 6 wheel, 3 traction motors, suspension arrangement. Its most remarkable advantage is its obstacle climbing capability. A truck suspension comprising a frame, a first bogie wheel supporting truck including a first sleeve, a second bogie wheel supporting truck including coaxial second and third sleeves extending in spaced relation to each other at a distance at least as great as the axial length of said first sleeve, means pivotally mounting said first and second trucks on said frame for. Nasa developed the rocker bogie suspension system for their rovers and was. It helps maintain maximum articulation of the suspension as well as durability. Its also available in combination with individual front suspension.
In order to maximize their maneuverability during the competition, the students set a design criteria of being able to traverse any of the prescribed obstacles in the mining arena. The majority of semitrailer suspensions found in britain are currently based on steel leaf springs but the proportion of air sprung systems is growing rapidly. The rocker bogie suspension design has become a proven mobility application known for its superior vehicle stability and obstacleclimbing capability 1. This paper will describe how the mer rockerbogie suspension subsystem was able to meet these conflicting design requirements while highlighting the variety of deployment and latch mechanisms employed in the design. Bogie suspension design is a complex and difficult science which has evolved over many years.
This paper will describe how the mer rocker bogie suspension subsystem was able to meet these conflicting design requirements while highlighting the variety of deployment and latch mechanisms employed in the design. Low power mobility system for micro planetary rover micro5. Mar 12, 2012 save up to 85 pounds with the softek front suspension system, providing superb ridability, stability, and durability for heavy duty truck applications. Rocker bogie rover mobility tests picaxe 28x2 duration. In this paper, the suspension springs of bogie md52 with mm line gauge have been designed to satisfy both the static and dynamic conditions. The rockerbogie system is the suspension arrangement developed in 1988 for use in nasas mars rover sojourner, and which has since become nasas favored design for rovers. See bogie spread, volvo tride 38,00046,000, page 17. The primary mechanical feature of the rocker bogie. System configuration figure 1 shows the schematic diagram of an active suspension system.
I had to weld the arms to the hubs to keep everything together ubiozur welding ltd. Our bogie suspension, as a trailer suspension system, comes in various types, including high frame type, low frame type, cantilever type, and so on. Some of the significant steps in progress are described here. A threedimensional diagram for a rear tandem driving axle bogie suspension is shown in. A bogie may remain normally attached as on many railroad cars and semitrailers or be quickly detachable as the. This system is giving a high level of stability to the center of gravity of the robot and provides it with high torque due to its six motors.
Bobo bogie bi axle bogie, axle independently driven it contain 2 axle 4 wheels, 2 tm. Bogie suspension system and access the possibility to implement in front loading vehicles, iosr journal of mechanical and civil engineering, eissn. These are steel leaf springs connected by a balance beam to equalise loads, air springs interconnected to provide levelling and static equalisation, and a centrallypivoted bogie system using either rubber or steel springs. Bogie suspension, vehicle suspension industry fuhua. Design and implementation of a rockerbogie suspension for a. Railway car bogie suspension system anffrangeco, s. A bogie may remain normally attached as on many railroad cars and semitrailers or be quickly detachable as the dolly in a road train or in railway bogie exchange. One of the main advantages of these air suspensions is that the driver is more comfortable when driving a vehicle or trailer with air suspensions. This bogie can resist mechanical failures caused by the harsh environment on mars. Jan 09, 20 rocker bogie suspension system nikhil vaidya. Lets have a look at some of its remarkable qualities. Design and implementation of a rockerbogie suspension for a mining robot.
Basics of vehicle truck and suspension systems and. The ifs independent front suspension arrived on the. As with any suspension system, the tilt stability is limited by the height of the center of gravity. Elastic elements helical, air, rubber springs these are components which return to their original position when forces causing the affect are removed. International journal of advance research and innovative ideas in education 3. Railway technical web pages archive page vehicle suspension systems introduction almost all railway vehicles use bogies trucks in us parlance to carry and guide the body along the track. The rockerbogie suspension design has become a proven mobility application known for its superior vehicle stability and obstacleclimbing capability 1.
This is in between bogie and vehicle either through a bolster or bolsterless. The rockerbogie suspension system passively keeps all six wheels on the robot in contact with the ground even on uneven surfaces. Nasa has developed this suspension system in a series of the project called rocky. Y25freight truck have been analysed in reference 10.
Bogie suspension system outboard marine corporation. The low frame type suspension is suitable for normal cars, as well as high clearance vehicles due to the great stability. The rocker bogie system is the suspension arrangement used in mars rovers introduced for mars pathfinder and also used on mars exploration rover mer and mars science laboratory msl missions. Effect of suspension system in the lateral stability of. The doosan moxy articulated dump truck is designed to work under rough conditions and can also travel at speeds up to 31 mph. In a suspension system for supporting a railway car, said car having an underframe to transmit the weight of the car to at least one downwardly projecting pivot pin, said bogie having a rigid frame means mounted on at least two pairs of trackengaging wheels. This can be of inside frame type where the main frame and bearings are between the wheels, or more commonly of outside frame type where the main frame and bearings are outside the wheels. On the earliest trucks up until the late 50s leaf springs were used at both front and rear, just like the stage coaches of the wild west. The two front and two rear wheels have individual steering motors which allow the vehicle to turn in place.
The suspensions are considered the best substitute to leaf spring suspensions. It has been used in the 2003 mars exploration rover mission robots spirit and opportunity, on the 2012 mars science laboratory msl missions rover curiosity, and is slated for use in the mars 2020 rover. Suspension to absorb shocks between the bogie frame and the rail vehicle body. Bogie suspension system and access the possibility to implement in front loading vehicles, iosr journal of mechanical and civil engineering, e. Page 8 group 37 wiring diagram fl6 component wiring diagram index page 34 bogie lift, aride page 35 air suspension, 4x26x2, rigid, emedium chidb344350 page 36 air suspension, 4x26x2, rigid, emedium chid. The benefits of different suspensions used in heavy duty low. Notes volvo body builder instructions vn, vhd, vah, section 6 usa8165691 date 1. Bogie bracket saddle bracket the bogie bracket assembly saddle bracket provides stability for lateral movement and serves as an anchor for the spring cradle and the parabolic spring assembly.
The term rocker describes the rocking aspect of the larger links present each side of the suspension system and balance the bogie as these rockers are connected to each. One design characteristic that was important is that each side of the suspension can be placed on the other side without alteration. The benefits of different suspensions used in heavy duty. Design analysis of rocker bogie suspension system and. Almost all railway vehicles use bogies trucks in us parlance to carry and guide the body along the track. View and download volvo group 655601 service manual online. An air suspension system consists of polyurethane bags and rubber that are inflated using a compressor. Dual beam suspensions are considered independent suspension systems as the two wheels are not directly connected as they are on the solid beam suspension discussed above.
Tandem axle lift allows the rearmost drive axle on the tandem bogie to be disengaged and raised, to reduce fuel consumption and turning radius. The rockerbogie suspension system from last year remains relatively the same from last year. The challenge posed by mer was to design a lightweight rocker bogie suspension that would permit the mobility to stow within the limited space available and deploy into a configuration that the rover could then safely use to egress from the lander and explore the martian. There are three commonly used types of bogie suspension found in britain, shown in figure 1.
Following several technology and research rover implementations, the system was successfully flown as part of mars pathfinders sojourner rover. According to wheel arrangement bogie are to two type mainly. This paper proposes a new dynamic rockerbogie suspension system with two modes of operation. The design was also to focus on the automation and drive systems. Introduction over the past decade, the rockerbogie suspension design has become a proven mobility application known for its superior vehicle stability and obstacleclimbing capability. Casnub bogie box bogie uic bogie cast steel bogie diamond frame bogie 601. Page 8 group 37 wiring diagram fl6 component wiring diagram index page 34 bogie. In this article, well explore how car suspensions work, how theyve evolved over the years and where the design of suspensions is headed in the future. In addition to its relatively simple structure, it has the advantage of decreasing the impact of track irregularities on the railcar at the car suspension point, in comparison to the singleaxle bogie which transmits the impact to the car directly fig.
May 01, 2002 on the earliest trucks up until the late 50s leaf springs were used at both front and rear, just like the stage coaches of the wild west. T railway technology today 5 edited by kanji wako how. Design analysis of rocker bogie suspension system and access. They can operate at high speed even on the most challenging haul routes, and they work effectively on the roughest, hardtoreach load and dump sites. The challenges of designing the rockerbogie suspension. The rockerbogie suspension system has robust capabilities to deal with uneven terrain because of its distributing of the payload over its six wheels uniformly, while there is one major shortcoming to highspeed traversal over the planar terrain. Products trailer axles and suspension systems mechanical. The bogie bracket plays a key role axially as well as radially. Jpl states that this rocker bogie system reduces the motion of the main mer vehicle body by half compared to other suspension systems. Unlike your car suspension system, rocky bogie system can enable the robot to climb an obstacle has twice its wheel diameter depends on the motor torque and wheel surface friction. Bogie project gutenberg selfpublishing ebooks read. Bogies take various forms in various modes of transport.
Chapter 6 bogies and suspension hindi content page 1 of 121 chapter 6 bogies and suspension at present, following four types of bogies are in service. Rocker bogie suspension has all the qualities needed for traversing the extremely uneven surfaces. Three new wagons are subjected to different load conditions and for each wagon a proper set of springs has been suggested. A bogie may remain normally attached as on a railway carriage car or locomotive, or on a semitrailer or be quickly detachable as the dolly. The main ones are bogie design principle parameters, guiding suspension, primary spring and damping principles that are. Dec 01, 2015 this system is giving a high level of stability to the center of gravity of the robot and provides it with high torque due to its six motors. Primary, between axle box and bogie frame and secondary, between bogie frame and bolster. Bogie designs today, very different bogie design principles are applied. The job of a car suspension is to maximize the friction between the tires and the road surface, to provide steering stability with good handling and to ensure the comfort of the passengers.