JP2606851Y2 - Friction transmission - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention is used for transmissions requiring low noise in general, and is used, for example, as a speed increaser for wind turbines and underwater robots (underwater mine handling boats). The present invention relates to a planetary friction transmission device.

[0002]

2. Description of the Related Art Conventionally, a rolling friction transmission is often used as a transmission requiring low noise. As shown in FIG. 5, the principle of the rolling friction transmission is that a load P is applied to a pair of rollers, and when the driving roller is rotated, a friction force fP (f is a friction coefficient) is generated, and the driven roller is driven by the friction force fP. It is well known that it rotates at
Whether to generate P is an important technical issue. FIG. 6 shows this principle applied to a planetary friction type transmission.
In FIG. 6, a planetary roller transmission in which three planetary rollers 2a circumscribing the sun roller 1a and supported via planetary bearings 4a on planetary pins 3a provided on the planetary frame are inscribed in the ring 5a. The pressing force (normal force) of the planetary roller 2a against the sun roller 1a is generated by shrinking the ring 5a. FIG. 7 shows a barrel (barrel) type planetary roller 6a with a tapered ring 8 provided inside a ring 7a.
a, 9a are arranged, and the ring 10a is pushed in the axial direction by a mechanism (not shown) (oil pressure, spring, screw tightening), so that the gap between the tapered rings 8a, 9a and the planetary roller 6a and between the planetary roller 6a and the sun roller 11a. This is an example of a method in which a normal force is applied during the operation. FIG. 8 shows a U-shaped elastic ring 1.
An example is shown in which the normal force is generated by pushing the 2a in the axial direction and deforming it in the radial direction as indicated by the broken line (part A) in the figure.

[0003]

In the conventional planetary friction transmission described above, the contact surface between the rollers is a so-called cylindrical (roller) internal contact as shown in FIGS. ,
It is a circumscribed rolling contact surface. When such rolling contact surfaces are lubricated with oil, the frictional force changes depending on the state of the lubricating oil film formed between the contact surfaces. It is well known that the change is large especially when the roller speed fluctuates. In order to prevent the oil film from being generated so much on the roller, a groove is formed on the outer periphery of the roller and the inner periphery of the ring. However, there is hardly any example in which these grooves are formed on a device having a pressing force generating mechanism. This is because the grooves formed on the outer peripheral portion of the roller are worn, so that the pressing force (normal force) is generally reduced. Therefore, it was necessary to correct the pressing force by another mechanism, and it was not easy to equip the device for that. Further, in the conventional method, since the amount of deformation of the contact portion is small, a small amount of roller wear causes a decrease in the normal force , making it difficult to stabilize the performance. The present invention solves the above-mentioned conventional problems, and without forming a special groove on the rolling contact surface between the rollers of the friction transmission device, while maintaining a sufficient pressing force between the rollers, a lubricating oil film. An object of the present invention is to provide a friction transmission device capable of obtaining a stable friction force without being affected by formation.

[0004]

Means for Solving the Problems The present invention for this purpose, circumscribes the sun roller, and inscribed in the ring, the planetary rollers of the planetary type transmission device in which a plurality of planetary rollers that are rotatably supported by the carrier is disposed On the outer circumference of the plate spring, a leaf spring having a thickness in the axial direction and continuously formed in a helical shape is arranged, and the helical leaf spring is compressed in the axial direction and assembled, so that the radial direction of the leaf spring is The sun roller is pressed against the outer peripheral side surface of the roller to generate a pressing force against the rolling contact surface of the roller, and this is used as means for solving the problem. In addition, the present invention provides a planetary transmission in which a plurality of planetary rollers that are circumscribed to a sun roller and inscribed in a ring and are supported by a carrier are arranged on an outer periphery of the sun roller .
A plate spring having a thickness in the axial direction and continuously formed in a helical shape is arranged, and the helical plate spring is compressed in the axial direction and assembled, so that the outer peripheral side surface of the plate spring in the radial direction is mounted. The planetary roller is pressed to generate a pressing force against the rolling contact surface of the planetary roller, and this is used as means for solving the problem.

[0005]

SUMMARY OF Invention The present invention by compressing axially disposing the helical plate spring in Russia over La outer periphery, the spring outside diameter increases. Therefore Yu star that put the transmission planetary system, by providing the leaf spring to one at the sun, the side surface of the thick portion of plate springs, the lubricating oil film formed on the rolling contact surfaces of the rollers As a result, a sufficient pressing force is generated between the rollers without forming a special groove on the rolling contact surface between the rollers that transmit the driving force. Stable friction transmission without causing a decrease in force or the like is achieved.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention. This first embodiment has an axial thickness on the inner circumference of the ring, and a continuous spiral
This is a planetary transmission in which a plurality of planetary rollers 2 that are circumscribed to the sun roller 1 and inscribed in the ring 9 and that are supported by a carrier are arranged. Bearings 3 and 4 respectively support the bearings.
Now, assuming that the input shaft is the sun shaft 5, the ring 9 is fixed, so that the rotation of the sun roller 1 causes the planetary roller 2 to revolve and revolve, and the rotation revolves the planetary roller 2 with a plurality of planet pins 7. The rotation of the supported carrier 8 is obtained, and the carrier is taken out as output rotation and the output shaft 6 is driven. In the inner peripheral portion of the ring 9 in the planetary transmission having this configuration,
Has a thickness in the axial direction concentrically as shown in FIG. 2 ,
A leaf spring 10 continuously formed in a spiral shape is disposed, the casing 12 is tightened by a bolt 13 with an elastic body 11 interposed therebetween, and the leaf spring 10 is compressed in the axial direction. If you, the leaf spring 10 is deformed into and out side in the radial direction, pressing force between the rolling contact surfaces of the planetary rollers 4 are generated. The output shaft 6 is supported by a side casing 17 with a bearing 14, and bearing press nuts 15 and 16 are provided outside the bearing 3 and the bearing 14. The ring 9 is bolted to the side casing 17, and the bearings of the input shaft 5 and the output shaft 6 are positioned by bearing holding lids 20 and 21 provided with oil seals 18 and 19, respectively.

[0007] Next axial direction on the outer periphery of the planetary rollers 22 in FIG. 3
Spring 2 having a thickness in the direction and continuously formed in a spiral shape
3 shows a second embodiment of the present invention in which the third embodiment is provided. The leaf spring 2
3 is screwed to the planetary pin by a holding plate 24 with a screw and compressed in the axial direction. In this way, a normal force which is a pressing force between the rolling contact surface of the sun roller 25 and the rolling contact surface of the ring 26 is obtained.

Next, a third embodiment of the present invention will be described with reference to FIG. 4. This third embodiment has a thickness in the axial direction mounted on the sun portion 31 in addition to the first embodiment of FIG. In this example, a helical leaf spring 27 is compressed in the axial direction by a pressing plate 30 fixed with bolts 29 via an elastic plate 28. In the third embodiment, the elastic plate 28 is interposed in the leaf spring 27 to always generate an appropriate axial compressive force, thereby obtaining an appropriate normal force which is a pressing force between the rollers. Is made possible. That is, it is limited to having a thickness in the axial direction.
It is a continuous spirally formed plate in the present invention.
Spring functions as rollers such as planetary rollers and ring rollers
Need to have For this reason, a certain amount of
It is necessary to increase the thickness and reduce the contact surface pressure. Also
The meaning of the helical leaf spring is as follows. This
It is pushed in with a certain force in the direction of the arrow in the axial direction using FIG.
Then, the diameter D ₀ increases. An increase in D ₀ is due to
A certain force is created between the rollers,
It becomes the normal force of the transmission and generates a predetermined driving force.
It becomes

[0009]

In the above, as explained in detail the present invention, according to the invention], in the low noise type Yu star-type friction transmission device, circumscribed to the sun roller, and is inscribed in a ring, a plurality of planetary rollers that it is supported by a carrier the outer periphery of the front Ki遊 star rollers arranged planetary gearing, or on the outer periphery of the sun roller, has a thickness in the axial direction, is arranged a leaf spring formed in a spiral shape continuously, the spiral since as assembled by compressing the plate spring in the axial direction, it is not affected by the speed change transmission performance (torque Den
Attainment efficiency), and a planetary system that can control the normal force is established. In particular, by making the peripheral surface of the thickness part of the leaf spring a rolling contact surface, the lubricant oil film formed on the rolling contact surface of each roller is cut, and the rolling contact surface between each roller that transmits the driving force is particularly distinguished. Since a sufficient pressing force in the normal direction can be obtained without forming a groove or the like, it is possible to perform friction transmission while maintaining a stable friction coefficient.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a spiral leaf spring which is a basic component of the present invention.

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

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

FIG. 5 is an explanatory view 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 longitudinal sectional view of a conventional barrel-type planetary roller transmission.

FIG. 8 is a longitudinal sectional view of a conventional elastic ring type planetary roller transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sun roller 1a Sun roller 2 Planetary roller 2a Planetary roller 3 Input shaft bearing 3a Planetary pin 4 Planetary roller bearing 4a Planetary bearing 5 Input shaft 5a Ring 6 Output shaft 6a Barrel type planetary roller 7 Planetary pin 7a Ring 8 Carrier 8a Taper ring 9 Ring 9a Taper ring 10 Leaf spring 10a Ring 11 Elastic body 11a Sun roller 12 Leaf spring pushing plate 12a Elastic ring 13 Bolt 14 Output shaft bearing 15 Input shaft bearing retainer 16 Output shaft bearing retainer 17 Side casing 18 Input shaft seal 19 Output shaft seal REFERENCE SIGNS LIST 20 input shaft bearing retainer cover 21 output shaft bearing retainer cover 22 planetary roller 23 helical leaf spring 24 planetary leaf spring retainer 25 sun roller 26 ring 27 helical leaf spring 28 elastic plate 29 leaf spring retainer bolt 30 leaf spring retainer

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 13/08 F16H 13/10

Claims (2)

(57) [Scope of request for utility model registration] 1. A circumscribe the sun roller, and inscribed in the ring, the outer periphery of the planetary rollers of the planetary type transmission device in which a plurality of planetary rollers that are rotatably supported are arranged in the carrier, has a thickness in the axial direction By arranging a leaf spring formed continuously in a helical shape and compressing and assembling the helical leaf spring in the axial direction, the sun roller is pressed against the radially outer peripheral side surface of the leaf spring, and A friction transmission device that generates a pressing force against a rolling contact surface of a roller. 2. A planetary transmission in which a plurality of planetary rollers circumscribed to a sun roller and inscribed in a ring and arranged on a carrier are arranged, and the outer periphery of the sun roller has an axial thickness. By arranging a leaf spring formed continuously in a spiral shape and compressing and assembling the spiral leaf spring in the axial direction, the planetary roller is pressed against the radially outer peripheral side surface of the leaf spring. A friction transmission device that generates a pressing force against a rolling contact surface of a roller.