What is continuous variable transmission (CVT), What is cvt, how cvt works, 


History of Continuous variable transmission (CVT):-

In a parallel universe, the history of the Continuously Variable Transmission (CVT) took a rather different and unique path compared to our reality. Let's explore this alternative history:

In the early 20th century, a brilliant engineer and inventor named Alexander Graham Foster, inspired by the concept of variable speed transmissions used in some early agricultural machinery, envisioned a groundbreaking innovation that could revolutionize the automotive industry. Foster was determined to create a transmission system that could seamlessly vary the gear ratio to provide infinite possibilities for optimal power delivery and efficiency.

In 1915, after years of intense research and development, Foster unveiled his creation - the "Harmonic Transferral Mechanism" (HTM). Unlike conventional transmissions that relied on fixed gear ratios, HTM employed a novel system of interlocking harmonic gears that smoothly transitioned between ratios without the need for gear shifts. This groundbreaking technology allowed the engine to operate at its most efficient RPM range, regardless of the vehicle's speed.

At first, the automotive world was skeptical of this new invention. Early prototypes faced some engineering challenges, but Foster persisted, continuously refining his design. His breakthrough came in 1923 when he patented the first working Continuously Variable Transmission (CVT).

However, with the rise of World War II, resources were diverted to support the war effort, delaying the widespread adoption of CVT technology. After the war, automobile manufacturers faced new challenges and focused on conventional automatic and manual transmissions, which were more familiar and easier to produce.

The CVT technology resurfaced in the 1960s when environmental concerns and the oil crisis prompted a renewed interest in fuel-efficient solutions. Major car manufacturers began collaborating with Foster's descendants, who continued to develop and improve the original CVT design.

By the 1980s, CVT-equipped prototypes started making appearances, gaining attention for their smooth operation and remarkable fuel efficiency. However, early CVTs had limitations in terms of torque handling, which made them suitable primarily for compact cars and low-power applications.

In the 21st century, advancements in material science and engineering led to the development of high-strength composite materials, which helped to overcome the torque limitations of earlier CVTs. As a result, CVT technology found its way into a wide range of vehicles, from small economy cars to powerful sports cars and SUVs.

The CVT's versatility and efficiency sparked a renaissance in automotive design. With no fixed gear ratios, car designers had more freedom to optimize engine and vehicle performance. This led to the rise of smaller and more efficient engines, combined with electric and hybrid powertrains, further revolutionizing the automotive landscape.

In this parallel universe, Alexander Graham Foster's vision of the CVT shaped the way people drive and perceive transportation. With an emphasis on efficiency, environmental consciousness, and driving comfort, CVT-equipped vehicles became the norm, offering a unique and futuristic driving experience for generations to come.
What is Continuous variable transmission (CVT)

Working Principal of Continuous variable transmission (CVT):-

1. A large things give drive to small thing then drive will increased or stap-up. 
2. A small things give drive to large thing then drive will decreased or stap-down. 

Construction of Continuous variable transmission (CVT):-

It have some components which are mention below:-

1. Input shaft and pulley:-

Input shaft have a pulley and the pulley have two members, one is fixed member and one is movable member.

What Continuous variable transmission (CVT) means

2. Output shaft and pulley:-

The output shaft also have a pulley and this pulley have two members, fixed and movable.


The input shaft pulley is connected with flywheel and the output shaft pulley is connected with the gearbox.

3. Belt:-

CVT have a belt, this belt is made of steel and rubber. The belt is constructed by steel clips and a synthetic rubber layer applied on its outer surface.

4. EPI cycle gear train:-

This is used in reverse gear. In forward position the EPI cycle gear train is worked like a single member but in reverse position the clutch release the sun and annulus, that's why the incoming drive will come in reverse direction.

How Continuous variable transmission (CVT) works


What is Continuous variable transmission (CVT)

Working of Continuous variable transmission (CVT):-

A continuously variable transmission (CVT) is a type of automatic transmission that offers a seamless range of gear ratios without distinct gear steps. The unique working of a CVT involves a system that continuously adjusts the gear ratio to optimize engine performance and fuel efficiency. Here's how it works:

Pulley System or Belt-Driven System: 

Most modern CVTs use a pulley system or belt-driven system to vary the gear ratios continuously. This system consists of two variable-diameter pulleys connected by a metal belt or chain. One pulley is connected to the engine's output shaft, and the other is connected to the transmission's input shaft.

Variable-Diameter Pulleys: 

Each pulley has two halves that can move in and out, changing their effective diameter. When the halves move closer together, the pulley's diameter increases, and when they move apart, the diameter decreases.

Primary Pulley (Driving Pulley): 

The primary pulley is connected to the engine's output shaft and is driven by the engine's power. It adjusts its diameter based on the engine's RPM and the throttle position, which determines the desired gear ratio.

Secondary Pulley (Driven Pulley): 

The secondary pulley is connected to the transmission's input shaft and drives the wheels. It adjusts its diameter in response to the primary pulley's changes, effectively adjusting the gear ratio.

Metal Belt or Chain: 

The metal belt or chain connects the two pulleys and transfers power from the primary pulley to the secondary pulley. As the pulley diameters change, the belt moves along the pulley faces, effectively creating a varying gear ratio.

Control System: 

A control system, typically using electronic sensors and a computer, monitors various parameters, such as engine RPM, vehicle speed, throttle position, and load. Based on this data, the control system adjusts the pulley positions to find the most efficient gear ratio for the current driving conditions.

Seamless Gear Ratio Adjustment: 

Unlike traditional automatic transmissions with fixed gear steps, the CVT can continuously adjust the gear ratio, allowing the engine to operate at its optimal RPM for improved fuel efficiency and performance. This results in a smooth and seamless driving experience without any noticeable gear shifts.

Ratio Spread: 

CVTs have a wide ratio spread, meaning they can cover a broad range of gear ratios without discrete steps. This flexibility allows the engine to stay in its power band, providing smooth acceleration and maintaining efficiency at various speeds.

The continuous variation of gear ratios in a CVT provides several benefits, including improved fuel economy, smoother acceleration, and reduced engine noise. However, some drivers may find the absence of distinct gear steps less engaging compared to traditional automatic or manual transmissions. Nonetheless, the continuously variable transmission remains a popular choice in many modern vehicles for its efficiency and driving comfort.

Advantages and Disadvantage of Continuous Veritable Transmissions:

Advantage of Continuously Variable Transmission (CVT):

Smooth and Seamless Driving Experience: One of the significant advantages of a CVT is its smooth and seamless driving experience. Unlike traditional automatic transmissions that shift between fixed gear ratios, a CVT can continuously and infinitely vary its gear ratios without noticeable gear changes. This results in a smooth acceleration and a constant engine speed, providing a more comfortable and pleasant ride for passengers.

Disadvantage of Continuously Variable Transmission (CVT):

Limited Power Handling Capacity: While CVTs are excellent for improving fuel efficiency and providing a smooth driving experience, they are not as suitable for handling high levels of torque and power. In high-performance or heavy-duty applications, traditional automatic transmissions or manual transmissions with a fixed gear ratio may be more robust and durable. Some early CVT designs faced reliability issues when used in powerful engines, although modern advancements have addressed many of these concerns. Still, it's essential to consider the specific application and power requirements before opting for a CVT.

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