KR20010092606A - CVT using hydroic - Google Patents

Abstract

PURPOSE: A CVT(Continuously Variable Transmission) using fluid is provided to have moving-forward or backward as well as stopping in a vehicle in a different way of other transmissions and to obtain actually high efficiency by reducing the weight of the vehicle. CONSTITUTION: A CVT using fluid consists of: a driving shaft(1) rotated by engine torque; a screw(2) rotated integrally with the driving shaft, functioning to pull fluid from a case(8) toward a diagonal flow impeller(3); a couple of diagonal flow impellers(3,4) rotating the fluid flowing from the screw; a driven shaft(5) rotated integrally with the diagonal flow impeller(3); a case(6) having the same velocity and small torque of the driven shaft, or having low velocity and high torque depending on the entire sectional area; a cam(7) rotating one or both sides in the opposite direction by using hydraulic pressure or a motor; a case(8) covering the case(6); and an accumulator(9) for preventing an engine from being overheated when hydraulic pressure rises up. The CVT using fluid has moving-forward or backward as well as stopping in a vehicle. The CVT has actually high efficiency as the weight of the vehicle is reduced. Therefore, the CVT is useful for high weight of trains or ships in a different way of belt type CVT.

Description

Continuously variable transmission {CVT using hydroic}

Bernoulli's equation p1 / γ + v1 ² / 2g = p2 / γ + v2 ² / 2g = H

Power P = γHQ

Diffuser effect

From the Bernoulli equation, it can be seen that p1 / γ + v1 ² / 2g = p2 / γ + v2 ² / 2g = H.

It can be seen that the velocity of the fluid can be changed by changing the cross-sectional area.

Fluid is now contained in the case cut into sections.

When the drive shaft of ① rotates, the skew of ② moves along with it and sends the fluid on the side of ⑧ to the front. This fluid loads the impeller of ④ and returns the driven shaft of ⑤ as a result. This fluid is circulated back to ⑧ and consequently circulated.

The explanation is based on Figure 1.

①Drive Shaft: Rotate by the power of the engine.

② Screw: It rotates like Gu Do Wook and draws fluid from ⑧ and sends it to ③.

③ Four-flow impeller: The fluid sent from ② is received through ④ and rotated. ④ is a variable wing type and the blade is deformed according to the speed or torque. Also, when moving forward, as in ① of Fig. 2, and when moving backward, as in ② of Fig. 2, when stopping, as in ③ of Fig. 2, but the main use is moving forward, design for forward movement.

⑤Driven Shaft: Rotate with ③.

⑥ Case: It is mainly used for change.

① In the state, the entire cross-sectional area is the same, the speed of the driven shaft is the same and the torque is small.

In the ② state, the cross section of the input shaft becomes small, resulting in low speed and high torque.

At this time, the total volume is reduced, and the length of the case is shortened, which will be explained in ⑦ and ⑨. An elastic body is inserted around the hump to prevent the fluid from counting.

⑦ Cam: Compared to ① in Fig. 3, when it reaches ②, the overall length is reduced. In order to achieve this state, the Han Chinese should be fixed and one side or both sides rotated in opposite directions. The cam mechanism is installed in accordance with these two conditions to reduce the length at the same time as it rotates by using hydraulic pressure (because it is high pressure) or motor.

⑧ Case: It is only one side in the picture, but it can be designed to wrap around the case ⑥ in consideration of mechanical or economical point of view.

⑨ Accumulator: Compared to the state of ① in Fig. 3, the state of ② is reduced. This increases the hydraulic pressure so much that the engine is overwhelmed and it is used to prevent this.

It is also used for brakes and steering systems without making hydraulic motors separately.

Unlike other transmissions, it has both forward and reverse frames within its own, and its own weight is also light, so its practical efficiency is high. Unlike belt continuously variable transmissions, it can also be used for heavy-duty trains and ships.

Claims (3)

Using the principle of ⑥ in Fig. 1 and modifying ⑦ accordingly. Transforming ④ of figure 1 to match speed or torque Using ⑨ of Figure 1