JP3486210B2 - Planetary friction transmission - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a transmission that generally requires low noise, such as a speed increaser for wind power generation, a transmission for helicopters, or an underwater robot (underwater mine treatment boat) reducer. The present invention relates to a planetary friction transmission device used for the above.

[0002]

2. Description of the Related Art Conventionally, a rolling friction transmission is often used as a transmission that requires low noise. As shown in FIG. 5, the principle of rolling-type frictional transmission is that a load P is applied to a pair of rollers, and when the driving side roller is rotated, a frictional force fP (f is a friction coefficient) is generated, and the driven roller is frictional force of fP. However, how to generate an appropriate fP is an important technical issue. FIG. 6 shows how this principle is applied to the planetary friction type transmission. Figure 6
Shows a planetary roller transmission which is circumscribed to the sun roller 1a and in which three planetary rollers 2a supported by planetary pins 3a provided on the planetary frame via planetary bearings 4a are inscribed in the ring roller 5a. Therefore, the pressing force (normal force) of the planetary roller 2a against the sun roller 1a is generated by shrink-fitting the ring roller 5a. Figure 7 shows a barrel
The taper rings 8a and 9a inscribed in the ring roller 7a are arranged on the planetary roller 6a of the mold, and a mechanism (hydraulic pressure,
An example of a system in which a normal force is applied between the taper rings 8a and 9a and the planetary roller 6a and between the planetary roller 6a and the sun roller 11a by pushing the ring 10a in the axial direction by (spring, screw tightening) Is. Further, FIG. 8 shows an example in which a U-shaped elastic ring 12a is pushed in the axial direction to be deformed in the radial direction as indicated by a broken line (A portion) in the drawing to generate a normal force.

[0003]

In the conventional planetary friction transmission device, as shown in FIGS. 6 to 8, the contact surface of each roller is a so-called cylindrical (roller) inner or outer rolling contact surface. Has become. When the ring roller is fixed and used as a speed reducer, the sun roller is the input and the planet frame is the output. When used as a speed increaser, similarly, the ring roller is fixed, the planet frame serves as an input, and the sun roller serves as an output. In the case where the input is due to an irregular natural wind force, the input rotation speed may increase momentarily, and even when the gas turbine is driven, over-rotation may occur due to insufficient adjustment. In that case, as described above, the ring roller is fixed, and it takes time until it rolls even if it rotates excessively.During that time, the slip speed difference between the sun, planet, and ring rollers increases, and the normal line If the force is not reduced, the Pv value (product of surface pressure and slip velocity) increases, and the amount of heat generated on the contact surface may increase, possibly causing seizure. Therefore, the present invention solves the problems in the conventional planetary friction transmission device as described above, and each of the sun, the planets, and the ring in the planetary friction transmission device is also changed by the fluctuation of the rotation speed due to the irregular input source. An object of the present invention is to provide a planetary friction transmission device that does not cause seizure between rollers due to heat generation due to slippage.

[0004]

Therefore, according to the present invention, there is provided a planetary type in which a plurality of planetary rollers supported by a planetary frame which is circumscribing a sun roller for transmitting a driving force by friction and inscribed in a ring roller is arranged. In the transmission, means for detecting the number of rotations of the input side sun roller, and when the detection means detects that the number of rotations on the input side starts to rotate at a speed other than a predetermined number of rotations , the sun roller, the planetary roller , phosphorus rotational speed and direction to reduce the sliding speed difference between the ring roller
Means for externally rotating the grawler,
In order to prevent seizure due to slip between the sun roller, planetary roller and ring roller,
The input side is a planetary frame, which serves as means for solving the problem.

[0005]

According to the present invention, means for detecting the number of rotations of the sun roller or the planetary frame on the input side is provided by the means described above, and when the input number of rotations exceeds the predetermined number of rotations by the detection means, the gear shift A device that rotates the ring roller that has been fixed for this purpose, for example, by driving the belt with a motor, in the direction and the number of rotations that reduces the slip speed difference between the sun roller, planet roller, and ring roller in the planetary friction transmission. By rotating, the sun roller, planetary roller,
It is possible to prevent seizure between ring rollers.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the present invention. In FIG.
There is a sun roller 1 and a plurality of planet rollers 2 circumscribing the sun roller 1, and each planet roller 2 is supported by each planet pin 7 by a planet bearing 3 as shown in FIG. Now, assuming that the input shaft is the sun shaft 5, the rotation of the sun roller 1 is decelerated as the revolution speed of the planet roller 2 and taken out because the ring roller 9 is fixed, and a plurality of planet pins 7 are arranged. The output shaft 6 is rotationally driven via the planetary frame 8. In this case, it functions as a speed reducer.

Now, assuming that D _A is the outer diameter of the sun roller 1 and D _C is the inner diameter of the ring roller 9, the rotation speed detection device 10 detects the rotation speed of the sun shaft 5, which is the input shaft, and detects the rotation speed of the sun roller 1. When the rotation speed ω _A begins to decrease by Δω _A , the ring roller 9 is fixed, and therefore the planetary roller 2 tries to revolve at the speed of the formula (1) by inertial force.

[Equation 1] On the other hand, when the ring roller 9 is rotated by ω _C in the B direction, the revolution speed of the planetary roller 2 becomes slow as shown in the following equation (2).

[Equation 2] That is, ω _C such that (1) − (2) = Δω _A + 1 + i _O
To rotate.

[Equation 3] That is, when rotating at the speed shown in equation (3), it becomes possible to operate at the same speed difference as before starting to decrease by Δω _A. As a result, slippage between the sun roller 1 and the planetary roller 2 and between the planetary roller 2 and the ring roller 9 due to the decrease in the number of rotations of the sun roller 1 as the input shaft can be eliminated.

On the contrary, when the rotation speed of the sun shaft 5 which is the input shaft is detected by the rotation speed detection device 10 and the rotation speed ω _A of the sun roller 1 starts to increase by Δω _A , the ring roller 9 is fixed. Therefore, the planetary roller 2 has inertial force.
Attempts to revolve at the speed of equation (1). On the other hand, when the ring roller 9 is rotated by ω _C in the A direction, the revolution speed of the planetary roller 2 is increased as shown in the following equation (4).

[Equation 4] Therefore, ω _C such that (1) − (4) = Δω _A + 1 + i _O
To rotate.

[Equation 5] That is, when rotating at the speed shown in equation (5), it becomes possible to operate at the same speed difference as before increasing by Δω _A.

As a result, it is possible to eliminate slippage between the rollers due to an increase in the number of rotations of the sun roller 1 which is the input shaft. Thus, the rotation speed detected by the rotation speed detection device 10 enters the control device 18, performs the above-described calculation to rotate the motor 12, and the belt driving roller 15 to rotate the belt. 11
Is rotated to rotate the ring roller 9.
When it is not necessary to rotate the ring roller 9 during normal constant speed operation, the belt 11 may be fixed by the brake 17.

FIG. 3 shows a second embodiment of the present invention. In this case, as shown in FIG. 4, the shaft 6 connected to the planet frame 8 serves as the input shaft, and the planet roller 2 is rotated via the plurality of planet pins 7, thereby rotating the sun roller 1. In this case, since the ring roller 9 is fixed,
The planetary roller 2 is rotated around the sun and the sun roller 1 is rotated.
To function as a speed increasing device. Input side rotation speed ω
_{When S} increases by Δω _S , the rotation speed detection device 14 detects this, and when it is determined to be abnormal, the gear 13 is rotated by the appropriate motor 12 and meshes with the teeth engraved on the outer periphery of the ring roller 9. By doing so, the ring roller 9 is rotated.

Now, when the planetary frame 8 is rotating at the rotation speed ω _S , the ring roller 9 is rotated in the direction A in the rotation direction in the figure by ω _C.
When rotated by, the rotation speed ω _A of the sun roller 1 is as follows.

[Equation 6] On the other hand, ω _C = 0 where the ring roller 9 is fixed
At the time of, the rotation speed ω _A of the sun roller 1 is as follows.
( Substitute ω _C = 0 in equation (6) ).

[Equation 7] Therefore, the rotation number ω of the ring roller 9 in the A direction is _C Rotated in
Rotation speed ω of the sun roller 1 expressed by Eq. (6)
_A Is expressed by equation (7)The ring roller 9 is fixed
ω_CWhen = 0Rotational speed ω of the sun roller 1 _A compared to, Δω _A = (6)-(7) = i _O ω _C Only It will be increased, sun roller 1, planet roller
2. Reduce the slip speed difference between the ring rollers 9
It is possible to prevent seizure during rolling.

[Equation 8] Therefore , the ring roller 9 is moved in the A direction so that the rotation speed ω _A of the sun roller 1 for ω _C = 0 becomes an increase on the input side.
Ring roller 9 is fixed when rotating at the rotation speed ω _C
When the ring roller 9 is rotated in the direction of arrow A at the rotation speed ω _C shown in the equation (8) obtained based on the difference when ω _C = 0, the rotation speed ω _S of the planetary frame 8 is Δω _S It is possible to drive at the same speed difference as before it started increasing. As a result, it is possible to prevent the seizure due to the slip between the rollers due to the speed increase of the shaft 6 on the planetary frame 8 side which is the input shaft.

On the contrary, when the rotational speed ω _{S of the} shaft 6 connected to the planetary frame 8 in the rotational speed detection device 14 starts to decrease by Δω _S , the ring roller 9 is fixed, so that the sun The roller 1 tries to rotate according to the following equation (9) .

[Equation 9] On the other hand, when the ring roller 9 is rotated in the B direction at the rotation speed ω _C , the rotation speed ω _A of the sun roller 1 becomes slow as shown in the following expression (10) .

[Equation 10] Therefore, the ring must be (9)-(10) = (1 + i _O ) Δω _S
It is rotated at a rotational speed omega _C the roller 9 in the direction B.

[Equation 11] That is, (11) is rotated at a speed in the expression of the planet carrier 8 times
It is possible to operate at the same speed difference as before the number of turns ω _S begins to decrease by Δω _S. Therefore, it is possible to prevent seizure due to slippage between the rollers due to deceleration of the shaft 6, which is the input shaft. The rotation speed detected by the rotation speed detection device 10 enters the control device 18, performs the above-described calculation, rotates the motor 12 and rotates the gear 13, and is engraved on the outer circumference of the ring roller 9. The ring roller 9 is rotated by meshing with the tooth.

[0013]

As described above in detail, according to the present invention, in the low noise type planetary friction transmission device, the sun roller and the planet frame (the revolution speed of the planet roller) which are the input shafts adopting the irregular input source are employed. Even if the number of rotations fluctuates, the ring roller, which is normally fixed for gear shifting, is rotated in the direction and number of rotations to correct the difference in rotational speed, and the sun roller, planetary roller, ring The difference in sliding speed between the rollers can be reduced, and seizure can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a friction transmission device according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a friction transmission device according to a first embodiment of the present invention.

FIG. 3 is a cross-sectional view of a friction transmission device according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a friction transmission device according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing the principle of friction transmission.

FIG. 6 is a cross-sectional view of a conventional ring shrink-fit type planetary roller transmission.

FIG. 7 is a vertical sectional view of a conventional barrel type planetary roller transmission.

FIG. 8 is a vertical cross-sectional view of a conventional elastic ring planetary roller transmission.

[Explanation of symbols]

1 sun roller 2 planetary rollers 3 Planetary roller bearing 5 input axes 6 axes 7 planet pins 8 planetary frames 9 Ring roller 10 Rotation speed detection device 11 belts 12 motors 13 gears 14 Rotation speed detection device 15 Laura 16 bearings 17 Brake 18 Control device

Claims (2)

(57) [Claims] 1. A planetary transmission device in which a plurality of planetary rollers, which are circumscribed by a sun roller for transmitting a driving force by friction and are inscribed in a planetary frame inscribed in a ring roller, are arranged. means for detecting the rotational speed, the rotational speed of the input side by the same detection means detects that began to rotate at other than the predetermined rotational speed, the sun roller, planetary rollers, the sliding speed difference between the ring roller smaller Means for rotating the ring roller from the outside depending on the direction of rotation and the number of rotations
The planetary friction transmission device is characterized in that the seizure between the sun roller, the planetary roller, and the ring roller due to slippage is prevented by including. 2. The planetary friction transmission according to claim 1, wherein the input side is a planetary frame.