Chained infinitely variable speed transmission gear

Abstract

The invention discloses a chained infinitely variable speed transmission gear, belongs to an F16H9 / 24 category according to international patent classification (IPC) retrieval, and discloses a transmission gear capable of transmitting rotational movement at a variable speed ratio by the aid of a chain, a friction bevel wheel set and a sprocket. The chained infinitely variable speed transmission gear comprises the friction bevel wheel set (1), the transmission chain (2), the sprocket (3) and a tension wheel (4). The transmission chain (2) is tensioned via the tension wheel (4) and encircles the friction bevel wheel set (1), the friction bevel wheel set (1) comprises two friction bevel wheels which are coaxially and oppositely mounted, and the two friction bevel wheels can axially move in opposite directions, so that the working radius of the transmission chain (2) can be changed. The chained infinitely variable speed transmission gear is characterized in that the sprocket (3) presses the transmission chain (2) on the friction bevel wheel set (1), and rotational torque can be transmitted between the friction bevel wheel set (1) and the sprocket (3) via the transmission chain (2) and a chain shaft (6).

Description

technical field [0001] The invention is a chain-type continuously variable transmission device, which belongs to F16H9 / 24 classification according to the International Patent Classification (IPC). Background technique [0002] In recent years, metal belt continuously variable transmissions ( figure 1 ) and pendulum chain continuously variable transmission ( figure 2 ) is a typical application example of this type of device. Both of these two kinds of continuously variable transmissions belong to the friction mechanical continuously variable transmission, and their basic structure and shifting principle are the same, that is, two friction cone wheels installed opposite to each other on the same axis form a friction cone wheel set, and a metal belt or swing pin The chain is formed around two sets of friction cone wheels. By moving the two friction cone wheels in the opposite direction along the axis, the effective working radius of the metal belt or swing pin chain surroun...

AI Technical Summary

Problems solved by technology

[0003] The metal belt of the metal belt type continuously variable transmission is composed of more than 400 steel sheets passing through the flexible endless steel belt. Limited to the strength of the flexible endless steel belt, the metal belt cannot bear excessive tension, so the metal belt is The compressed side between the two friction cone wheels transmits power in the form of thrust, but this also makes it difficult for the metal belt to be tensioned on the friction cone wheels, resulting in insufficient friction, thus limiting the transmission of large torques. On the other hand, the processing difficulty, high cost and short service life of the metal strip are its obvious disadvantages

[0004] The pendulum pin chain CVT uses the pendulum pin chain as the component for power transmission. Since the pendulum pin chain can withstand a large pulling force, it avoids the problems encountered by the metal belt CVT. However, the pendulum pin structure of the pendulum pin chain causes The chain pitch is not fixed, so the total length of the chain is a variable, and the difficulty of processing and high cost are also its disadvantages. In addition, solving the polygon effect is also its technical difficulty

[0005] To sum up, the above two types of mechanical continuously variable transmissions that are currently most widely used in the automotive field use flexible elements (metal belts or swing pin chains) as the only components for power transmission, so the performance of flexible elements The requirements are very strict, which leads to problems such as high processing difficulty, high cost and short service life of flexible components

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