JPS63246563A - Contact rotating element - Google Patents

Abstract

PURPOSE:To reduce a power transmission element requiring high frictional force in size and weight by providing a circumferential fine groove on the surface of one rotor and a projecting element larger than the above groove on the other rotor, and rotating both rotors in a pressure contact state. CONSTITUTION:When a pair of rotors 1, 2 are rotated in pressure contact state, a projecting element 4 mounted on the rotor 2 is pushed in a circumferential fine groove 3 provided on the surface of the rotor 1. In this case, as the width of the projecting element 4 is larger than the width of the groove 3, the projecting element 4 pushes away material of the side surface of the groove 3 in the axial direction vertical to the rotating direction so as to raise the surface. Consequently, a very large force partially acts therebetween so that both rotors 1, 2 rotate in contact each other with high friction. Accordingly, the load in the radial direction of the rotor can be made small and the loads of bearings for supporting the rotors can be reduced, so that a power transmission element requiring high frictional force can be reduced in size and weight.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to devices such as robots and equipment used in space.
The present invention relates to an element that transmits power through contact rotation, which is small, lightweight, and suitable for cases where high-output power transmission is required.

[Prior art] Gears used in the shell as power transmission elements are
There is a lot of shock and noise during power transmission, as well as wear and tear due to sliding contact with the south side, and it is difficult to make it smaller and lighter. Furthermore, recently, devices that transmit power by bringing them into contact with each other under a large pressing force via oil have been commercially available, but this also has the drawback that it is difficult to make the mechanism lighter and the transmission force is not large. be.

[Problems to be Solved by the Invention] In rotating elements that rotate in contact with each other, it is customary to minimize the surface roughness and at the same time increase the hardness of the surface. It increases the durability and wear resistance. however,
The present inventors have discovered that in a special shape comparable to the situation in which the surface of the rotating body is relatively rough, that is, the protrusions of one rotating body are pushed into fine grooves on the surface of the other rotating body. By actively utilizing the elastic deformation of the groove,
It was confirmed that the contact friction force between the two could be dramatically increased.

To explain this more specifically, the present inventors made a hole with a depth of about 0.006 mm and a width of about 0.07 mm in one of a pair of cylindrical rotating bodies using a micro Vickers indenter, and then As a result of pressing the body against it and rotating it, a height of 0.0 mm is created at the position corresponding to the hole in the rotating body as shown in FIG. OQ about 6mm, rtJ0.11mm
As a result of measuring the shape of the hole after the experiment, it was confirmed that the shape was as shown in FIG. 3.

Comparing both figures, the width of the raised protrusion is the rtJ of the hole.
Precise measurements revealed that this difference is due to the elastic deformation of the groove when it induces a bump on the opposing surface.

The present invention aims to reduce the size and weight of power transmission elements that require high frictional force by utilizing such a phenomenon between rotating bodies that rotate in contact with each other.

[Means for Solving the Problems] A contact rotating element of the present invention for achieving the above object consists of a pair of rotating bodies that rotate in contact to transmit power, and has a circumferential surface on the surface of one of the rotating bodies. A fine groove in the direction is provided on the other rotating body, and a protrusion larger than the groove is provided on the other rotating body, and the two rotating bodies are rotated in a press-contact state.

The protrusion is pushed into the groove and pushes the material on the side surface of the groove in an axial direction perpendicular to the direction of rotation, so that both rotating bodies can come into contact with each other with high friction.

In addition, without providing the protrusions in advance, a protrusion is formed that is pushed into the groove when the other rotating body is pressed into contact with a rotating body provided with a fine groove in the circumferential direction, and when both rotating bodies are in pressure contact, a protrusion is formed. During rotation, the protrusions are pushed into the grooves and force the material on the side surfaces of the grooves in the axial direction perpendicular to the direction of rotation, thereby bringing the two rotating bodies into contact with each other with high friction.

[Sakukawa] The contact rotating element described in L has a structure in which, when a pair of rotating bodies are rotated in pressure contact, fine grooves are formed in the circumferential direction on the surface of one of the rotating bodies.
A protrusion provided on the other rotating body or a protrusion formed by pressure welding is pushed in and pushes the material on the side of the groove in the axial direction perpendicular to the rotation direction, so a very large internal friction acts between the two rotating bodies. As a result, it has the advantage of reducing the radial load on the rotating body and, therefore, the load on the bearings that support them, making power transmission elements that require high frictional force smaller and lighter. becomes possible.

[Example] A contact rotating element according to the present invention is constituted by a pair of cylindrical or rod-shaped rotating bodies that rotate in contact to transmit power. Ten thousand of the rotating bodies are provided with a large number of fine grooves in the circumferential direction on the surface thereof, and the other rotating body is provided with a large number of corresponding protrusions that are wider than the grooves. Figure 1 (
a) schematically shows a rotary body 1.2 provided with grooves 3 and protrusions 4 constituting the above-mentioned contact rotary element.

When these rotating bodies are rotated in a press-contact state, the protrusions are pushed into the grooves, but in this case, the protrusions [
Since the mouth is larger than the width of the groove, the protrusions push the material on the side of the groove in the axial direction perpendicular to the direction of rotation, causing it to build up on the surface, and as a result, a very large, albeit partial, force acts between them. However, both rotating bodies rotate in contact with each other with high friction.

FIG. 1(b) shows the relationship between the force acting between the groove 3 and the projection 4 of the pair of rotating bodies 1.2, and the vertical component Pv given as the load between the rotating bodies 1.2 and , protrusion 4 in groove 3
The state in which a force P acting perpendicularly to the contact slope between the groove 3 and the protrusion 4 is applied as a resultant force of the horizontal component PH generated by pushing the groove 3 and the protrusion 4. The horizontal component PH has the effect of increasing the friction even if the load between the rotating bodies 1 and 2 is relatively small.

Furthermore, even if the protrusions are not provided in advance, as described above,
As the pair of rotating bodies rotate under pressure, protrusions are formed on the surface of the other rotating body in correspondence with the grooves on the surface of one rotating body, and these protrusions are pushed into the grooves to form grooves. Since the material on the side surface of the rotor is pushed in the axial direction perpendicular to the direction of rotation, both rotating bodies can be rotated in contact with each other with high friction, just as if the protrusion had been provided from the beginning.

In this way, the grooves provided on one rotating body deform each time the other rotating body comes into contact with it, but since this deformation is an elastic deformation, the groove generally returns to its original shape after the contact ends. to return to.

The contact friction force of the rotating element described above is due to the fact that the material on the side surface of the groove bulges on the surface in the direction perpendicular to the direction of rotation due to the protrusion pushing into the groove of slightly smaller size and shape. Compared to the case where no child is provided, the size can be increased from several times to more than ten times, and no mechanism or lubricating material is required for this purpose. Moreover, the contact portion changes one after another with one rotation, and the shape after contact is the same as before contact because the elastic deformation phenomenon of the groove is utilized.

The shape and dimensions of the projections vary depending on the material, heat treatment, dimensions, speed, transmission horsepower, etc. of the pair of elements. - For example, if the height of the protrusion is 0.006 m, the width of the protrusion should be approximately 20 times the height, or 0.11 mm, and the groove dimensions should be approximately 0.11 mm in depth. 0.006 mm, and the groove width may be about 0.07 mm, which is about half of the protrusion [J. Elastic recovery can be easily performed with the protrusion and groove dimensions of this size.

The rotating body has a size that allows it to be small and lightweight, such as a hollow cylinder or a small diameter cylindrical part.

A-built one can be adopted. Therefore, it is important to realize miniaturization and weight reduction of elements and transmission of high frictional force.
(For example, it can be expected to be used in robots, communication equipment, the space field, light, thin, and small products, high-output power transmission fields, vacuum environment technology fields, etc.)

[Effects of the Invention] According to the contact rotating element of the present invention detailed above, the following effects can be expected.

■ By using a simple mechanism that actively creates small protrusions and smaller grooves along the cylindrical surfaces of a pair of rotating elements, the friction force is several times higher than that of the conventional case without protrusions. Frictional force is obtained. In other words, high-output power transmission is possible.

(Li) This mechanism does not create an impact effect.

■ It can be applied to any small rotating element and can be made smaller and lighter.

(4) During contact rotation, there is less sliding action on the contact surface than in the past, so it can operate satisfactorily without lubricating oil even in a vacuum environment.

[Brief explanation of drawings]

Figure 1 (a) is a cross-sectional view schematically showing the configuration of a pair of rotating bodies, Figure 1 (b) is an explanatory diagram of the action of force between the pair of rotating bodies, and Figures 2 and 3 are from this book. FIG. 2 is a diagram showing the results of basic experiments regarding the contact rotating element according to the invention. 1.2...Rotating body, 3...Groove, 4...Protrusion. Figure 1

Claims (1)

[Claims] 1. Consisting of a pair of rotating bodies that rotate in contact to transmit power, one rotating body has fine grooves in the circumferential direction on the surface, and the other rotating body has a larger protrusion than the grooves. When both rotating bodies are rotated under pressure contact, the protrusion is pushed into the groove and pushes the material on the side surface of the groove in the axial direction perpendicular to the direction of rotation, thereby causing both rotating bodies to have high friction. A contact rotating element characterized in that it can be contacted with. 2. Consisting of a pair of rotating bodies that rotate in contact to transmit power, the surface of one rotating body is provided with minute grooves in the circumferential direction, and the surface of the other rotating body is connected to the rotating body provided with the grooves. The surface is smooth enough to form a protrusion that is pushed into the groove when the two rotating bodies are pressed together, and when the two rotating bodies are rotated in a press-contact state, the protrusion that is formed corresponding to the groove is pushed into the groove. , by pushing the material on the sides of the groove in the axial direction perpendicular to the direction of rotation.
A contact rotating element characterized by allowing both rotating bodies to come into contact with each other with high friction.