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Sometimes we want to drive faster, or we need a large amount of driving force such as when driving uphill. It is necessary to achieve a driving force appropriate for the driving circumstances.

In this part we explained about the bearings that are used in devices that transmit power from the engine to the wheels, but there are a great many bearings used in the other parts of cars. By utilizing the strengths of each of the bearings, we increase the driving performance and safety of automobiles.In order to achieve safer and more comfortable driving, there is a greater and greater demand for bearings with both high functionality and high reliability.

In order to increase a car's performance by, for example, decreasing the CO2 (carbon dioxide) emissions that cause global warming, or reducing the number of breakdowns, bearings becomes more and more important.

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At the differential gear, gears attached to the pinion shaft (the shaft connected to the transmission) and the shaft on the wheel end interlock at a right angle. Bearings support both the rotation of the shafts and the force being applied by the gears.

Transmissions can be classified into two broad categories: manual and automatic. In cars with manual transmissions, a gear stick used to operate it is installed next to the driver's seat.

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There are various types of bearings, each with their own strengths. Do you know what kinds of machines use what kinds of bearings?

Just as the gear and the shaft have a different number of rotations, the needle roller bearing (a combination of needle rollers and cages) is mounted between the gear and the shaft, and rotates between the inside surface of the gear and the outside surface of the shaft.

In Part 1, we introduced the idea that, in the majority of cars using conventional engines, there are usually around 100-150 bearings at work.Part 1: What Are Bearings? Let's learn about the basic functions of bearings!

In this part, we will explain how bearings are used in the transmission and differential gear that transfer power from the engine to the wheels.

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In this part, we will introduce the bearings used in cars, as "Part I" of our introduction of the applications of bearings.

A bearing, of a type to match the magnitude of the power from the engine, is used, and it supports both the rotation of the shafts and the force being applied by the gears.

If you would like to know more about those bearings used in cars that we did not introduce on this column, please click the link below.

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Click here for more information on the JTEKT "LFT-Series of low-friction torque tapered roller bearings* "LFT" is an abbreviation for "Low-Friction Torque," and is a registered trademark of JTEKT.

JTEKT provides the best low-friction torque tapered roller bearings in the world, which allow for an extremely small loss of driving force during rotation. On top of this, we are also making compact bearings a reality, greatly contributing to a decrease in CO2 emissions from cars.

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The driver operates the gear stick manually, in order to convert the power from the engine into a force appropriate for the situation in which the driver is driving.The manual transmission consists of shafts and gears. These parts are supported by bearings, and we would now like to introduce those bearings.

The transmission is a device that converts the power from the engine into driving force and transmits it to the wheels. Inside, many different types of bearings are working together, each utilizing their own strength, and inside the individual parts of a car there are also a great many bearings in use.

In order to transmit a different driving force to the wheels for the changed situation, we use the gear stick to disconnect the connected gear (A) from the shaft and select the gear (B) that best fits that driving force. The selected gear (B) is connected to the shaft, and rotates the shaft with the same number of rotations.

In a manual transmission, gears remain in rotation and interlocking with each other at all times.In order to convey the appropriate driving force to the wheels for the speed we want to travel, we use the gear stick to select the gear (A) that best fits that driving force. The selected gear (A) is connected to the shaft, and rotates the shaft the same number of times.

The combined tapered roller bearings simultaneously support both the radial and the axial load (in both directions), and by maintaining the correct interlocking of gears transmit a large amount of driving force to the wheels on both sides.

The differential gear is a device that converts the driving power from the transmission into even greater driving power and allows for different numbers of rotations for the left and right wheels.