JP2010053898A - Power transmitting mechanism - Google Patents

Abstract

A power transmission mechanism for improving maintainability and reducing the size of the entire apparatus is provided.
A power transmission mechanism in which at least a pair of rotors (2) and (3) is arranged in a state in which meshing teeth provided on the outer peripheral portions of the rotors (2) and (3) are engaged with each other. Balls 4 constituting the meshing teeth are arranged in two rows with a certain interval, and balls 5 having an outer diameter larger than the interval between the two rows of balls 4 are arranged on the outer periphery of the other rotor 3. The meshing teeth are arranged in a row at a predetermined interval so as to be positioned between the two rows of balls 4, and the balls 5 enter between the two rows of balls 4. It is configured that torque transmission is generated between the rotors 2 and 3 by contact of the rotors 4 and 5.
[Selection] Figure 1

Description

  The present invention relates to a power transmission mechanism arranged in a state in which meshing teeth provided on an outer peripheral portion of a rotating body are meshed.

  A gear device is widely known as this type of power transmission mechanism. However, although the gear can transmit a large torque, there is a problem that it is difficult to manufacture because the tooth surface must be formed into an accurate involute curved surface. Therefore, conventionally, a mechanism in which the meshing teeth have a special shape has been proposed.

  For example, Patent Literature 1 describes a belt transmission device having a configuration in which a belt-side spherical surface portion is in meshing relationship with a tooth receiving portion of a pulley. Patent Document 2 discloses a belt transmission device in which teeth projecting from the inner periphery of a toothed belt are formed in a hemispherical shape, and a hemispherical recess is provided on the outer periphery of a pulley meshing with the hemispherical teeth. The configuration is described. Patent Document 3 describes a configuration in which teeth in a non-circular gear are formed by rollers.

Japanese Utility Model Publication No. 61-181150 Japanese Utility Model Publication No. 61-150542 JP-A-10-184852

  The configurations shown in Patent Documents 1 and 2 correspond to timing belts, and the teeth formed on the belt can be made spherical so that uniform engagement can be ensured. Since a large shearing force acts on the surface, durability may be impaired when the torque to be transmitted is large.

  In the configuration shown in Patent Document 3, since the meshing teeth are configured to pin the roller, the configuration is simple, but a load accompanying torque transmission acts as a shearing force or a bending load on the pin. Therefore, in order to transmit a large torque, it is necessary to increase the thickness of the pin, and accordingly, the diameter of each roller may increase, and the gear may increase in size.

  The present invention has been made by paying attention to the above technical problem, and aims to provide a power transmission mechanism that can be reduced in size and weight as a whole and that is excellent in maintainability. is there.

  In order to achieve the above object, the invention according to claim 1 is directed to a power transmission mechanism in which at least a pair of rotating bodies are arranged in a state in which meshing teeth provided on the outer peripheral portion of each rotating body are engaged with each other. The first spheres constituting the meshing teeth are arranged in two rows at a certain interval on the outer peripheral portion of the rotating body, and the interval between the two rows of first spheres is provided on the outer peripheral portion of the other rotating body. Second spheres having larger outer diameters are provided as the meshing teeth, arranged in a row at a certain interval so as to be positioned between the two rows of first spheres. The power transmission mechanism is configured such that torque transmission is generated between the rotating bodies when the second sphere enters between the spheres and comes into contact therewith.

  A second aspect of the present invention is the power transmission mechanism according to the first aspect, wherein each of the spheres is fixed to each of the rotating bodies.

  According to a third aspect of the present invention, in the first aspect of the present invention, each of the spheres is rotatably accommodated in a recess formed in each of the rotators for each sphere, and each rotator is disposed inside the housing. And a groove is formed in the housing and at a position corresponding to the outer peripheral portion of each rotating body so as to be able to rotate in a state where the rotating bodies are not detached from the recesses. This is a power transmission mechanism.

  The invention according to claim 4 is the invention according to claim 3, wherein the housing is formed with a guide hole that communicates with the groove and opens on an outer surface of the housing to guide the sphere to the groove and the recess. It is a power transmission mechanism characterized by being made.

  According to the first aspect of the present invention, since the torque transmission is generated between the first sphere and the second sphere, only the compressive force passing through the center of each sphere acts on each sphere. Is excellent. Moreover, since it is not a gear, it is not necessary to form it on an involute curved surface, so that it can be manufactured more easily than a gear.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, each sphere is generally capable of mass production with high accuracy and is fixed to each of the rotating bodies. This simplifies and improves manufacturability.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1, each spherical body is rotatably accommodated in a recess formed in each rotary body, and each rotary body is detached from the recess. Since the groove is formed so as to be able to rotate in a state where it is not allowed to function, it also functions as a bearing, the entire apparatus can be reduced in size, and the weight can be reduced accordingly.

  According to the invention of claim 4, in addition to the effect of the invention of claim 3, since the guide hole communicating with the groove from the outer surface is formed in the housing, the sphere can be easily guided to the groove or the recess. Can improve maintenance.

  The best mode for carrying out the invention will be described below. FIG. 1 is a front view schematically showing an embodiment of a power transmission mechanism according to the present invention. In FIG. 1, reference numeral 1 denotes a power transmission mechanism according to the present invention. Here, for example, the power transmission mechanism is applied to a transmission arranged on a power transmission path mounted on a vehicle.

  The power transmission mechanism 1 is composed of rotors 2 and 3 that are two rotating bodies. The rotor 2 is provided with balls 4 which are first spheres constituting meshing teeth on the outer periphery thereof and arranged in two rows with a certain interval. Then, balls 5 which are second spheres having an outer diameter larger than the interval between the balls 4 are arranged on the outer periphery of the rotor 3 as meshing teeth and arranged in a row at a certain interval so as to be positioned between the balls 4. Is provided. The one row of balls 5 enters between the two rows of balls 4 and the balls 4 and 5 come into contact with each other, whereby torque transmission is generated between the rotors 2 and 3.

  The balls 4 and 5 may be fixed to the rotors 2 and 3. In this fixing, a concave portion that can be fitted to a certain depth of the balls 4 and 5 is formed in a predetermined position on the outer peripheral portion of the rotors 2 and 3 in advance, and the balls 4 and 5 are driven and fixed in the concave portion. Is. As shown in FIG. 2A, two balls 4 driven into the rotor 2 are arranged in parallel on the outer peripheral side surface of the rotor 2. On the other hand, as shown in FIG. 5B, balls 5 are driven one by one in a row and fixed to the outer periphery of the rotor 3. And these balls 4 and 5 may be incorporated so that rolling is possible.

  Here, the rotors 2 and 3 may be made of metal, or may be made of a resin that can be easily processed. The balls 4 and 5 are formed in a spherical shape with a metal such as a steel ball or a resin. Therefore, the power transmission mechanism 1 can be easily manufactured, is excellent in strength and durability, and has a simple configuration, so that the size and weight can be reduced.

  Further, the engagement state of the balls 4 and 5 driven into the rotors 2 and 3 is formed on the rotor 3 on the two rows of balls 4 formed on the rotor 2 as shown in FIG. Are engaged so as to sandwich the row of balls 5. As shown in FIG. 1, when the rotor 2 rotates in the direction of the arrow a, the rotor 3 rotates in the direction of the arrow b according to the rotation.

  Alternatively, the driving and driven may be reversed, and one rotor 3 may rotate to become a driving force, and the other rotor 2 may be driven to rotate. As shown in FIG. 3, since the stress applied to the balls 4 and 5 acts only on the balls 4 and 5 from the contact points of the balls 4 and 5 to the centers of the balls 4 and 5, a large torque transmission occurs. It becomes possible. Further, since the bending stress generated in the tooth-shaped gear is not applied to the meshing teeth, it does not break from the tooth base.

  Next, a second embodiment will be described. FIG. 4 is a schematic front view schematically showing a second embodiment of the power transmission mechanism according to the present invention. FIGS. 5 (a) and 5 (b) show a second embodiment of the power transmission mechanism according to the present invention. It is a schematic sectional drawing which shows an Example typically. 4 and 5 (a) and 5 (b), the same reference numerals are given to the same components as those shown in the first embodiment.

  The power transmission mechanism 1 is disposed in the housing 6. The balls 4 and 5 that are each spherical body are rotatably accommodated in the concave portions 7 formed in the rotors 2 and 3 that are the respective rotating bodies for each of the balls 4 and 5. Accordingly, the rotors 2 and 3 are accommodated in the housing 6. Then, as shown in FIGS. 5 (a) and 5 (b), the balls 4 and 5 are rotated inside the housing 6 at positions corresponding to the outer peripheral portions of the rotors 2 and 3 without being detached from the recesses 7. A groove 8 that can be held is formed.

  The housing 6 may be made of, for example, metal or resin. The housing 6 is formed with a guide hole 9 that communicates with the groove 8 and opens on the outer surface of the housing 6 to guide the ball 4 to the groove 8 and the recess 7. This guide hole 9 makes it easy to replace the ball 4 fixed to the rotor 2. Although not shown, a guide hole may be formed on the rotor 3 side. Thereby, the power transmission mechanism 1 can be reduced in size and maintainability can also be improved.

  In addition, as shown in FIG. 6, the conventional tooth-shaped gear requires a bearing for the input shaft and the output shaft, but the power transmission mechanism 1 does not require a bearing for the input shaft and the output shaft, so that the size and weight are reduced. Can be achieved.

  Here, the rotor corresponds to the rotating body of the present invention, and the ball corresponds to the first and second spheres constituting the meshing teeth.

It is a front view showing typically an example of a power transmission mechanism concerning this invention. (A) is AA sectional drawing of FIG. 1, (b) is BB sectional drawing of FIG. 1, (c) is CC sectional drawing of FIG. It is a schematic front view which shows the stress concerning the balls 4 and 5 which concern on this invention. It is a schematic front view which shows typically the 2nd Example of the power transmission mechanism which concerns on this invention. (A) is DD sectional drawing of FIG. 4, (b) is EE sectional drawing of FIG. It is the schematic block diagram which showed the comparison of the magnitude | size of the power transmission mechanism which concerns on this invention, and the conventional mechanism.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Power transmission mechanism, 2 ... Rotor, 3 ... Rotor, 4 ... Ball, 5 ... Ball, 6 ... Housing, 7 ... Recessed part, 8 ... Groove, 9 ... Guide hole

Claims (4)

In the power transmission mechanism in which at least a pair of rotating bodies are arranged in a state where the meshing teeth provided on the outer peripheral portion of each rotating body are engaged,
The first spheres constituting the meshing teeth are arranged in two rows at a certain interval on the outer peripheral part of one rotating body,
In addition, a second sphere having an outer diameter larger than the distance between the two rows of first spheres is arranged between the two rows of first spheres at the outer periphery of the other rotating body as the meshing teeth. It is arranged in a row with a gap,
A power transmission mechanism configured such that torque transmission occurs between the rotating bodies when the second sphere enters between the two rows of first spheres and these spheres come into contact with each other. .   The power transmission mechanism according to claim 1, wherein each of the spheres is fixed to each of the rotating bodies. Each sphere is rotatably accommodated in a recess formed in each rotator for each sphere,
A groove for rotatably holding the respective spheres in a state in which the respective spheres are accommodated in the housing and corresponding to the outer peripheral portions of the respective rotators without being detached from the recesses. The power transmission mechanism according to claim 1, wherein the power transmission mechanism is formed.   The power transmission according to claim 3, wherein the housing is formed with a guide hole that communicates with the groove and opens on an outer surface of the housing and guides the sphere to the groove and the recess. mechanism.

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