Tillie Doyle
Pan hard bars, also known as Panhard bars, track bars, or track rods, are suspension links that provide lateral location of the axle. They are designed to prevent the sideways movement of the axle and keep it centred under the vehicle. This stabilizes the vehicle and improves handling, especially during acceleration and cornering. The geometry of the Panhard bar, including its length, height, and inclination, can affect the handling and performance of the vehicle. While Panhard bars are simple and effective, they may not be suitable for smaller cars due to their limited range of motion. Alternative systems, such as Watt's linkage, offer similar functionality with improved lateral control but at a higher cost and complexity. The choice between a Panhard bar and other systems depends on the specific requirements of the vehicle and the user's preferences.
| Characteristics | Values |
|---|---|
| Purpose | Prevent lateral movement of the axle |
| Function | Stabilizes the rear axle of a vehicle, allowing the rear wheels to move up and down but not sideways |
| Design | Consists of a rigid bar running sideways in the same plane as the axle, connecting one end of the axle to the car body or chassis on the opposite side |
| Pivots | Allow the bar to swivel upwards and downwards only, limiting the axle's movement to the vertical plane |
| Length | A longer bar results in less horizontal change than a shorter bar |
| Mounting | Should be mounted as horizontal as possible and as close to the axle as possible |
| Advantages | Simplicity, ease of installation, lightweight, low center of gravity |
| Disadvantages | Body moves in an arc relative to the axle, which can cause excessive sideways movement on smaller cars |
| Alternatives | Watt's linkage, sway bar, anti-roll bar |
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What You'll Learn
Panhard bars and axle movement
Panhard bars, also known as Panhard rods, track bars, or track rods, are suspension links that provide lateral location of the axle. They were invented by the Panhard automobile company of France in the early twentieth century and have been widely used since. The purpose of automobile suspension is to allow wheels to move vertically while preventing forward, backward, and lateral movement.
The Panhard bar is a simple mechanism that consists of a rigid bar running sideways in the same plane as the axle, connecting one end of the axle to the car body or chassis on the opposite side of the vehicle. The bar attaches at both ends with pivots that allow it to swivel vertically, restricting the axle's movement to the vertical plane. However, this does not effectively locate the axle longitudinally, so Panhard bars are typically used alongside trailing arms that provide longitudinal stability.
The Panhard bar controls the amount of lateral axle motion, and its length and position impact the handling of the vehicle. A longer Panhard bar reduces sideways axle movement, while a shorter bar may allow excessive sideways movement between the axle and the body. The height of the Panhard bar's mounting also affects the roll center height of the rear suspension, influencing the car's handling characteristics.
The use of Panhard bars can be advantageous for their simplicity, but they also have disadvantages. Due to the arc-like movement of the body relative to the axle, Panhard bars may be more suitable for larger vehicles where lateral movement is less critical. In some cases, alternative suspension designs like Watt's linkage may be preferred to reduce the sideways movement of the axle.
Overall, Panhard bars play a crucial role in controlling axle movement, particularly in lateral axle motion, and their design and placement can significantly impact a vehicle's handling and performance.
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The effect of bar length
The Panhard bar, also known as the Panhard rod, track bar, or track rod, is a suspension link that prevents lateral movement of the axle. The length of the Panhard bar can impact its effectiveness in controlling the lateral axle motion.
A longer Panhard bar results in less lateral deflection as it pivots, while a shorter Panhard bar allows for more lateral movement between the axle and the body. The ideal length of the Panhard bar depends on various factors, including the size of the vehicle, the desired handling characteristics, and the specific requirements of the suspension system.
For example, in smaller cars, a shorter Panhard bar may be preferred to optimize space and weight distribution. On the other hand, in larger vehicles or those with specific handling requirements, such as off-road vehicles, a longer Panhard bar may be used to minimize lateral movement and improve stability.
Additionally, the length of the Panhard bar can affect the roll center height of the suspension system. The roll center is an imaginary point where the application of a sideways force will not cause the chassis to roll. By adjusting the length and mounting position of the Panhard bar, the height of the roll center can be manipulated, which in turn affects the vehicle's handling characteristics.
Furthermore, the length of the Panhard bar can influence the amount of "rear steer" in a vehicle. "Rear steer" refers to the instability caused when the rear wheels are not pointed straight. A longer Panhard bar can help reduce "rear steer" by better aligning the rear wheels with the driveshaft and the center of the vehicle, resulting in improved stability during acceleration and cornering.
In summary, the length of the Panhard bar is a critical factor in its function and performance. It impacts the lateral movement of the axle, the roll center height, and the vehicle's handling characteristics, including the amount of "rear steer." Therefore, careful consideration of the Panhard bar's length and its interaction with other suspension components is essential for optimizing the overall performance and handling of the vehicle.
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$124.99
Roll centre height
The roll centre of a vehicle is a theoretical point where the cornering forces in the suspension are reacted to the vehicle body. In other words, it is the point at which a sideways force will not cause the chassis to roll. The roll centre height is determined by the mounting height of the rod.
There are two definitions of roll centre: the most commonly used is the geometric (or kinematic) roll centre, whereas the Society of Automotive Engineers uses a force-based definition. The geometric roll centre is dictated by the suspension geometry and can be found using principles of the instant centre of rotation. The force-based roll centre is defined as:
> The point in the transverse vertical plane through any pair of wheel centres at which lateral forces may be applied to the sprung mass without producing suspension roll.
The height of the roll centre is important as it affects the handling of a car. A higher roll centre will reduce the moment arm and, therefore, the roll moment. Once the roll centre and centre of gravity are at the same height, no kinematic roll occurs. Raising the roll centre can also decrease the roll couple generated in a corner and reduce overall body roll. Lowering the roll centre has the opposite effect, increasing the percentage of transferred weight that goes to the outside rear tyre, which loosens the car up.
Panhard bars can be used to locate the rear roll centre. They can be long or short, mounted high or low, level or inclined, and connected to the chassis on either side.
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Handling and stability
A Panhard bar is a suspension link that provides lateral location of the axle. It is a simple device designed to prevent lateral movement of the body over the axle. The Panhard bar stabilises the rear axle of a vehicle, allowing the rear wheels to move up and down but not sideways. This restriction on lateral movement keeps the wheels aligned with the driveshaft and centre of the vehicle, reducing "rear steer". This makes the vehicle more stable during hard acceleration or cornering.
The Panhard bar is particularly useful during cornering or when the vehicle makes sideways movements. The bar keeps the axle located laterally under the body, preventing the axle from moving too far to either side. Panhard bars are often added to older vehicles with solid rear axles to improve handling. Panhard bars are also used in drag racing, where they are added to solid rear axles to replace IRS systems.
The length of the Panhard bar is important for handling. Longer Panhard bars are preferable as they reduce the effects of lifting the body, which can be caused by shorter Panhard bars. The height of the Panhard bar is also significant. Raising the Panhard bar where it connects to the chassis will increase the amount that it pulls the axle to the left as the car rolls. This adjustment will increase roll oversteer, loosening the chassis in the turns.
Panhard bars are a cheap and simple way to stabilise the rear axle of a vehicle. An alternative system is a Watts linkage, which was invented in the 1700s and offers better symmetry and less side-to-side motion. However, a Watts linkage is more complex, expensive and heavier than a Panhard bar, and it raises the centre of gravity.
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Alternative stabilising systems
A Panhard rod (or bar) is a suspension link that limits the axle's movement to the vertical plane, preventing lateral movement. It is a simple device, consisting of a rigid bar running sideways in the same plane as the axle, connecting one end of the axle to the car body or chassis on the opposite side of the vehicle.
However, there are alternative stabilising systems to Panhard rods, including:
Watt's Linkage
A Watt's linkage is a suspension design similar to a Panhard rod, but it dramatically reduces the sideways component of the axle's vertical travel. Some vehicles with live-axle suspensions cannot use a Watt's linkage due to design or other practical constraints, so they may incorporate a Panhard rod instead.
Sway Bars
Sway bars, also known as anti-roll bars, limit the rotation of the body around the longitudinal axis. They are designed to keep both back wheels of a car on the ground, whereas a Panhard rod may encourage the inside rear wheel to lift in corners.
Electronic Stability Control (ESC)
ESC is a system that automatically helps stabilise a car when it detects a loss of steering control, such as going around a corner too fast. It does this by applying the brakes to individual wheels and reducing engine power until control is regained. ESC is now mandatory in new cars in several regions, including Canada, the US, and the European Union.
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Frequently asked questions
A Pan Hard Bar, also known as a Panhard rod, track bar, or track rod, is a suspension link that provides lateral location of the axle. It is a rigid bar that runs sideways in the same plane as the axle, connecting one end of the axle to the car body or chassis on the opposite side.
The Pan Hard Bar restricts the lateral movement of the axle, allowing it to move up and down but not side to side. This keeps the body of the car centred over the axle and improves handling, especially during acceleration or when turning corners.
Yes, an alternative system is called a Watts linkage, which was invented by James Watt in the 1700s. It eliminates almost all lateral motion and provides better symmetry with four points of connection. However, it is more complex, expensive, and increases the centre of gravity when the axle moves.
Pan Hard Bars are useful when you need to adjust the ride height of your vehicle, especially with coilovers or air suspension. They are also beneficial for off-road vehicles to improve handling on uneven surfaces.
