JPH0811976B2 - Conical friction wheel type continuously variable transmission - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a conical friction wheel type continuously variable transmission which is suitable for a transmission of an automobile which requires a transmission ratio according to a running condition of the vehicle.

[0002]

2. Description of the Related Art A continuously variable transmission ratio (CVT) is useful for effectively extracting engine output. A friction transmission is a unit in which parts that can be regarded as almost rigid bodies are brought into contact with each other, the rotational force is transmitted by the frictional force generated at the contact portions, and the rotational speed ratio can be changed by changing the contact position. Thus, the contact position can be continuously changed during operation. Since power is transmitted by friction, some slippage is unavoidable, so there are drawbacks such as uncertain speed ratio and difficulty in transmitting large power, but on the other hand, excessive load When there is a load, it has the advantages of serving as a safety device that prevents slippage and breaking of other mechanical parts, and that it transmits relatively quietly.

Conventionally, there are various pulley type CVTs. The belt pulley type is available in which steel pieces are connected with a steel flat belt, and in which the pieces are connected with a chain.

[0004]

The steel flat belt is one
There is a problem that the belt is cut due to relative slippage because there are a few sheets stacked. Also, since the belt has a heavy piece, the sound of hitting the pulley is produced, and when rotating at a high speed, the piece comes up from the pulley due to centrifugal force and the transmitted power is reduced. Also, in the case of chained chain pieces, the chain is heavy and the same problem occurs. Further, there is a drawback that noise is generated at high speed rotation due to the pitch of the chain. An object of the present invention is to provide a continuously variable transmission having a good gear ratio, a reliable speed ratio, and relatively quiet transmission.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a variable input groove width V-shaped vehicle having a pair of fixed input conical wheel and movable input conical wheel provided on an input shaft and an output shaft, respectively. And a variable output groove width V type wheel consisting of a fixed output conical wheel and a movable output conical wheel, and a variable input groove width V that is rotatably mounted on both ends of a connecting plate floating between them.
Two types of opposed groove width variable V type vehicle, which are composed of a double type friction wheel having a power transmission surface on both sides, which are engaged between both grooves of the type vehicle and output variable width V type vehicle. This is a conical friction wheel type continuously variable transmission with a variable transmission ratio, which utilizes the both rotary friction wheels to transmit the rotational force from the input shaft to the output shaft. The present invention will now be described in detail with reference to the following embodiments with reference to the drawings.

First, for the input shaft 2 and the output shaft 3 installed on the machine frame 1, a fixed input conical wheel 7 integrally wedged to the input shaft 2 and a movable input conical wheel that slides on a ball spline 16 of the input shaft 2 are provided. Output groove width consisting of variable input groove width V-shaped pulley 6 composed of 8 and fixed output conical wheel 10 integrally wedged to the output shaft 3 and movable output conical wheel 11 sliding on the ball spline 17 of the output shaft 3. A variable V type vehicle 9 is provided for each.
Reference numerals 4 and 5 are bearings of the input shaft 2 and the output shaft 3. Therefore, the movable input cone wheel 8 is integrated with the input piston 13 of the input cylinder 12, and the movable output cone wheel 11 is also provided.
Also serves as the output cylinder 14 of the output piston 15. The sum of the thrust of the output cylinder 14 and the compression spring 18 which gives the minimum pressing force is always in balance with the thrust of the input cylinder 12.

Next, reference numeral 21 denotes a connecting plate that floats between the corresponding input groove width variable V-shaped pulley 6 and the corresponding output groove width variable V-shaped pulley 9. At both ends of the connecting plate 21,
Two rotary friction wheels 19 and 20 each having a power transmission surface 23 on both sides, which are engaged with the input groove width variable V-shaped wheel 6 and the output groove width variable V-shaped wheel 9, have bearings 22, respectively. And it is installed rotatably. In the embodiment, the rotary friction wheels 19 and 20 are provided with two rotors 19a and 19a, respectively, as shown in the drawing.
b or the trochanters 20a and 20b, and has a plate-shaped disk shape having a power transmission surface 23 in the shape of a cone (cone) which has the same taper as the conical wheel on both sides. Further, in the present invention, two pairs of opposed groove width variable V type pulleys 6 and 9 are used, and the rotational force is transmitted from the input shaft 2 to the output shaft 3 through the rotary friction wheels 19 and 20. I am trying.
In the illustrated embodiment, the bearing 22 is first attached to one end of the connecting plate 21.
, The trochanter 19a is press-fitted, and the trochanter 19b is further press-fitted. Then, the trochanters 20a, 2 are also similarly provided at the other end.
0b is press-fitted. The shape of the power transmission surface 23 of the rotary friction wheels 19 and 20 is a cone shape as in the embodiment shown in the drawings, and is a line contact or a rotating body having an arc section.
It may be point contact.

[0008]

When the pressure oil is sent to the input cylinder 12, the movable input cone wheel 8 integrated with the input piston 13 moves, and the groove width with the fixed input cone wheel 7 becomes smaller. The rotary friction wheel 19 having the cone-shaped power transmission surface 23 has a variable input groove width V
Although it is extruded in the outer peripheral direction of the model adjusting wheel 6, since it is connected by the connecting plate 21, it enters the V-shaped groove of the output groove width variable V-type adjusting wheel 9. And fixed output cone wheel 1
0, increase the groove width of the movable output cone wheel 11. The hydraulic oil in the output cylinder 14 is discharged as the movable output cone wheel 11 moves. Then, the power splits from the input groove width variable V-shaped wheel 6 to the rotary friction wheels 19 and 20, and then joins the output groove width variable V-shaped wheel 9. Then, the effective radius of the power transmission contact point becomes large in both the input conical sheaves 7 and 8 and becomes small in both the output conical sheaves 10 and 11, thereby increasing the rotational speeds of the both output conical sheaves 10 and 11. And the rotary friction wheel 1
Since 9 and 20 move continuously, the gear ratio can be continuously changed.

[0009]

INDUSTRIAL APPLICABILITY The present invention has an input / output cone wheel 7 for transmitting power,
Since 8, 10, 11 and the rotary friction wheels 19, 20 are composed of rotating parts, the rotational balance is good from low speed to high speed rotation, power can be transmitted reliably, and the speed ratio is reliable and large. It is easy to transmit power. The power transmission by the rotary friction wheels 19 and 20 enables silent transmission operation without noise due to the pitch of the links, such as chain transmission. In addition, it has the advantages of small size, simple structure and long life.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a transmission of the present invention.

FIG. 2 is an explanatory diagram of a main part of FIG.

FIG. 3 is an explanatory view showing an arrangement of rotary friction wheels.

[Explanation of symbols]

 1 Machine frame 2 Input shaft 3 Output shaft 4,5 Bearing 6 Input groove width variable V type wheel 7 Fixed input cone wheel 8 Variable input cone wheel 9 Output groove width variable V type wheel 10 Fixed output cone wheel 11 Movable output cone wheel Car 12 Input cylinder 13 Input piston 14 Output cylinder 15 Output piston 16,17 Ball spline 18 Compression spring 19,20 Rotating friction wheel 19a, 19b, 20a, 20b Rotor 21 Coupling plate 22 Bearing 23 Power transmission surface

Claims (1)

[Claims] Variable input groove width consisting of a pair of fixed input conical wheel and movable input conical wheel provided on the input shaft and output shaft, and variable output groove width composed of fixed output conical wheel and movable output conical wheel The V-shaped vehicle and a connecting plate floating between them are rotatably mounted on both ends of the V-shaped vehicle, and are fitted between the V-shaped vehicle with variable input groove width and the V-shaped vehicle with variable output groove width. It consists of a double-rotating friction wheel with a power transmission surface on both sides.
A conical friction wheel type continuously variable transmission having a variable friction groove type V-shaped wheel that transmits a rotational force from an input shaft to an output shaft through both rotary friction wheels.