JPS6024340B2 - Friction roller transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is constructed by arranging a group of small depression rollers in an annular space formed between a central roller and an outer ring, and is used as a planetary roller device etc. in place of a subordinate planetary gear device. The present invention relates to a friction roller transmission device that can be used.

To explain this with reference to the attached embodiment drawings, as shown in FIGS. 1 and 2, the friction roller transmission device of the present invention has a central roller 1 having an outer circumferential surface with a perfect circular cross-sectional shape.
, an outer ring 2 which is arranged concentrically with the center roller 1 and has an inner peripheral surface with a perfect circular cross-sectional shape, and an annular space 4 between the center roller 1 and the outer ring 2. A small diameter roller group 3 is provided. The small diameter roller group 3 has a center o
The outer ring 2 includes a plurality of small diameter rollers 3a that are in rollable frictional contact with the outer peripheral surface of the outer ring 1, and a plurality of small diameter rollers 3b that are in rollable and frictional contact with the inner peripheral surface of the outer ring 2. Further, the small diameter rollers 3a, 3b constituting the small roller group 3 are closely arranged in the annular space 4 so that the small rollers 3a, 3b are in frictional contact with each other so as to be transferable. . In the illustrated embodiment, each of the small rollers 3a and 3b forms two inner and outer roller rows that are concentric with the center roller, and each small diameter roller 3a and the outer roller that form the inner roller row Each small roller 3b forming a roller circular row
are in rolling frictional contact with the center roller 1 and the outer ring 2, respectively.

Further, each of these small dimple rollers is arranged such that each adjacent pair of small light rollers in one roller row is in rolling frictional contact with a corresponding four-protrusion roller in the other roller row. . That is, two adjacent small-diameter rollers 3a in the inner roller row are in transferable frictional contact with a corresponding one of the four rollers 3b in the outer roller row, and similarly, two adjacent small diameter rollers 3a in the outer roller row The two small diameter rollers 3b are in transferable frictional contact with the corresponding small roller 3a of the inner roller row. With this configuration, a stable structure in which each small depression roller is rotatably supported at three points can be obtained. As mentioned above, in the illustrated embodiment, the small strain roller group 3 forms two roller rows.

However, in a structure in which one or more intermediate roller rows are further formed between these roller rows, that is, in a structure in which the small diameter loaf group 3 forms three or more roller rows concentrically with the center roller 1. It is clear that it can be done. Even in this configuration, each of the four rollers forming the adjacent roller rows is
By making the relative arrangement of the diameter rollers similar to the illustrated embodiment, a stable structure in which each small roller is supported at three points can be obtained. In addition, in FIGS. 1 and 2,
2a and 2b are small diameter roller skewing, that is, friction.

- To avoid the phenomenon that the central axis of the small diameter roller and the central axis of the central roller are not kept parallel when the Ra transmission is operated, and the central axis of the small diameter roller becomes inconvenient with the central axis of the central roller, the outer ring is 2, and la designates an outer projection integrally formed on the central roller 1 for the same purpose. The inner protrusion 2b and the outer protrusion la may be formed in an annular shape. However, in order to be able to insert each of the small diameter rollers 3a and 3b into the annular space 4 when assembling the friction roller transmission, the inner protrusion 2a has a shape in which a part of the ring is cut out (the first figure). The friction roller transmission device shown in FIGS. 1 and 2 has the above-described structure, and as shown in FIG. Each small-diameter loaf 3a in the circular row of outer rollers and each small-diameter loaf 3b in the circular row of outer rollers rotate counterclockwise and clockwise at rotational peaks and ~, respectively,
Further, the outer ring 2 rotates clockwise at a rotation speed n2. Furthermore, the small rollers constituting the 4-loaf roller group 3 work together to perform a rotational movement at a rotational speed around the wisteria line of the central loaf 1, that is, a planetary movement. The relationship between the rotational speeds described above is similar to the relationship between the rotational speeds of the sun gear, planetary gear, and internal gear in a well-known planetary gear device, and can be expressed by the following equations [11 to '3']. However, the above formula {1} to {
3', S and S4 are the outer diameter of the central roller 1, the inner diameter of the outer ring 2, the outer diameter of the small diameter roller 3b in the outer roller row, and the small diameter roller 3 in the inner roller row, respectively.
The outer diameter of a is shown.

In addition, n is calculated by assuming that rotation in one direction (for example, clockwise) is positive and rotation in the opposite direction (for example, counterclockwise) as negative. From the above formulas m to [3}', apply sufficient external force P to compress the outer ring 2 radially inward,
It shows the relationship between the rotational speeds n to n5 when the center roller 1, each small-diameter roller, and the outer ring 2 are prevented from slipping when they are transferred. Therefore, in order to avoid hindrance to the assembly of the bonito image roller transmission device, it is desirable to apply the external force P after the assembly is completed. The small-diameter roller group 3 can be easily and well stored in the annular space 4 between the center loaf 1 and the outer ring 2, and each roller can be transferred without slipping by applying an external force P to the assembly machine. In order to make it, the above formula [1' to {
S in 3' to S4 are determined by the following equations '4} to '7). 8 S2 = S3 10R・COS 12 (S potato S4) 2-(R.Sin bone) 2---
-'4}8=should be...Wind R. =S・1S
4......■ R2: Sheep skin [7' However, in the above formula [4-], R and R2 are
The small diameter roller 3a and the outer roller of the inner roller row, respectively.
The radius of the orbits 5 and 6 of the small diameter roller 3b in the circular row, m
indicates the number of four rollers forming the small roller group 3.

Next, each small diameter when given a rotational input of the central roller 1 having a diameter of S,.

The torque T that can be transmitted to the roller is expressed by the following equation. T=S・Q -. ...--[81 However, the above formula '81
, 1 is the coefficient of friction between the center roller 1 and the small diameter roller 3a of the inner roller row, Q is the coefficient of friction between the center rollers 1 and 4 and the roller group, between each small diameter roller, and between the outer ring 2 and the small diameter roller group. It shows the total contact force that acts between

The contact force Q is determined depending on the external force P applied to the outer ring 2, the inner diameter S2 of the outer ring 2, the number of meters of the small diameter rollers, and the geometric arrangement, dimensions, material, etc. of each small diameter roller. As is clear from the above, in the friction roller transmission device of the present invention, the center roller 1, the small diameter roller group 3, and the outer ring 2 are of the above type {
1' to '3}, rotational movement is performed.

Therefore, the center. It is also possible to give a rotational input to the roller 1 and take out the rotation of the small diameter roller group 3 or the outer ring 2 as an output. It is also possible to take out the rotation as output. In addition, the central rollers 1, 4,
The friction roller group 3 and the outer ring 2 are designed to perform the same motion as the sun loaf, planetary gear, and internal gear in a well-known planetary gear device, so the friction roller transmission device of the present invention can be used in a conventional planetary gear device. It can be suitably used as an alternative planetary roller device.

In other words, conventional planetary gear devices that are constructed by incorporating various types of gears generally suffer from backlash during operation due to backlash of the gears, and uneven rotation due to tooth profiles, etc. There are drawbacks. In addition, gears have the problem of undercutting. For example, when the pitch diameter and number of teeth of an internal gear are determined, the planetary gear that engages with this internal gear is replaced by a small gear with a pitch diameter less than a predetermined value. There are also drawbacks such as the inability to configure more. However, according to the friction roller transmission device of the present invention, the drawbacks of the subordinate planetary gear device described above can be overcome. Figures 4 and 5
The figure shows the friction of the present invention.

This shows an application example of the roller transmission device. An example of this application is shown below. In this application example, a fluid coupling is constructed using the above transmission device, where 2' is an outer ring, 3' is an outer ring, and 3' is an outer ring.
indicates a group of small diameter rollers. Central loaf i.e. input shaft 1'
A swollen portion lb is formed in the central portion in the mariline direction, and this swollen portion and the small land rollers 3 of the inner roller circular row are in frictional contact so as to be mutually transferable. Further, the small flea rollers 3b' of the outer roller row are in transferable frictional contact with the outer ring 2'. As shown in FIG. 4, the outer periphery of the outer ring 2' has slopes 2c' and 2d' that are inclined radially inward from the approximate center of the outer ring in the marlin direction toward both left and right sides. There is. Also, on the input steel 1', there is a bearing pusher 12 and a seal member 7.
A casing 8 is rotatably iron-mounted via the input shaft, and an annular liquid chamber 9 is formed between the input shaft and the casing. The casing 8 is an output member of a fluid coupling, and the left and right casing parts 8a and 8b are bolted together.
The configuration is set to 0. Therefore, each casing part 8
Slopes 8 and 8b' are formed on a and 8b to engage with the slopes 2c' and 2d' of the outer ring 2', respectively, when these are bolted 10. Therefore, the component of the force in the axial direction applied to the housing portions 8a and 8b during bolting 10 acts as a force P' that compresses the outer ring 2' radially inward. By applying force P' in this manner, the small roller group 3' is tightly housed between the input shaft 1' and the outer ring 2', and slippage occurs between each roller when the fluid coupling is activated. It is something that can be avoided. In addition, on both sides of the predetermined number of four-pronged rollers in the inner roller circular row, fly cathode blades 11 are integrally protruded, and when the fluid coupling is operated, these light cathode blades 11 are integrated with the small diameter rollers. It is adapted to rotate within the annular liquid chamber 9.

The fluid coupling shown in FIGS. 4 and 5 has the above-mentioned configuration, and when a rotational input is applied to the input shaft 1', each small strain roller in the small diameter roller group 3' changes in response to the rotation. While rotating, these small flea rollers integrally revolve around the input shaft 1'.

In addition, in accordance with the rotation and revolution of the small-diameter roller, each rope floating blade 11 rotates and revolves, and damages the liquid in the annular liquid chamber 9, and the reaction force of the coagulation resistance causes the outer ring 2' and the output part This is to rotate the casing 8, which is a village. As is clear from the above, the fluid coupling using the friction roller transmission device of the present invention has a simple structure and operates smoothly, especially since the transmission device has a bearing-like structure. be.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a friction roller transmission device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, Fig. 3 is a diagram explaining the operation of the above-mentioned transmission device, and Fig. 4 is a cross-sectional view of a friction roller transmission device according to an embodiment of the present invention. Friction of the invention. FIG. 5 is an explanatory partial cross-sectional view of a fluid coupling constructed by incorporating a roller transmission device, and FIG. 5 is an explanatory diagram showing the arrangement of each component with the casing of the fluid coupling shown in FIG. 4 removed. 1...
・Central roller, 1'... Input shaft, 2, 2'...
・...Outer ring, 3, 3'...Small diameter roller group, 3a, 3...
Small diameter rollers in the inner roller row, 3b, 3b'...
- Small-diameter roller of outer roller circular row, 4... annular space, 8... casing, 9... annular liquid chamber, 11... rope floating feather. Figure 1 Figure 2 Figure 3 Figure 5 Figure 4

Claims (1)

[Claims] 1. A central roller having an outer circumferential surface with a perfect circular cross-sectional shape, an outer ring arranged concentrically with the central roller and having an inner circumferential surface with a perfect circular cross-sectional shape, and between the central roller and the outer ring. and a group of small-diameter rollers closely arranged in an annular space, each of the small-diameter rollers in the small-diameter roller group forming a plurality of roller rows concentric with the center roller, and each small-diameter roller of the inner roller row The rollers and each small-diameter roller of the outer roller row are configured to be in rolling frictional contact with the center roller and the outer ring, respectively, and each adjacent pair of small-diameter rollers in each roller row corresponds to the adjacent roller row. A friction roller transmission device characterized in that it is configured to be in rolling frictional contact with one small diameter roller.