JP2013127270A - Gear rotation controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear rotation controller which is a mechanism stopping the rotation between a pair of meshed gears (regulating a rotation angle) and separating force does not act (hardly acts) on between axes of the meshed gears.SOLUTION: A gear rotation controller includes: a pair of gears meshing each other; at least one stopper formed integrally with the pair of respective gears such that respective axial positions differ. The pair of respective stoppers are on the arcs whose centers are the centers of respective meshed gears having the stoppers, and formed in a position relationship in which the stoppers abut from peripheral directions each other when the pair of meshed gears are meshed each other and rotated.

Description

  The present invention relates to a rotation control device that controls the rotation angle of a pair of meshing gears.

  In Patent Document 1, at least one tooth is left with respect to one gear of a pair of meshing gears having different numbers of teeth, and the tooth tip (addendum portion) of the remaining tooth is cut off, and at least one tooth bottom (Dedendam) with respect to the other gear. The rotation control device of the gear formed by filling the part) is proposed. At least one tooth of the former gear (addendum portion cutting gear) is brought into contact with the tooth bottom embedded portion of the latter gear (dedendam portion embedded gear) at any rotational phase, and rotation is stopped. The rotational phase at which the stop is applied is set with a high degree of freedom depending on factors such as the number of teeth of the pair of meshing gears, the difference in the number of teeth, the number of teeth of the former gear, and the number of bottom embedded portions of the latter gear be able to.

  In Patent Document 1, the normal meshing of the pair of meshing gears tends to be insufficient. Therefore, Patent Document 2 proposes a drive device in which another ordinary gear that meshes with the addendum portion cutting gear and the dendendam portion embedded gear is coaxially integrated with each other.

Japanese Utility Model Publication No.59-32759 JP 2001-340153 A

  However, in the conventional gear rotation control mechanism described above, when the pair of meshing gears are stopped, the teeth of the addendum section cutting gear come into contact with the tooth bottom embedded section of the dendendam section embedded gear. There has been a problem that a separation force acts between the gear shafts. The separation force between the shafts easily causes play of gear meshing, and if the play is to be avoided, the bearing mechanism becomes large. Further, in Patent Document 2, since a normal meshing gear for rotation transmission is required separately from a pair of meshing gears for controlling the rotation angle, an increase in size is inevitable.

  The present invention is a mechanism for stopping the rotation between the pair of meshing gears (restricting the rotation angle) based on the above awareness of the problem, and the separation force does not act between the shafts of the meshing gears (it is difficult to act). ) To obtain a gear rotation control device.

  The present invention has been made based on the viewpoint that the rotation is stopped by the contact force in the rotation direction of the pair of meshing gears without applying a separation force between the shafts of the pair of meshing gears.

  The gear rotation control device of the present invention includes a pair of gears that mesh with each other; and at least one stopper that is formed integrally with the pair of gears at different positions in the axial direction. Further, it is characterized in that it is on a circular arc centering on the center of the meshing gear having the stopper, and is formed in a positional relationship in which the pair of meshing gears come into contact with each other in the circumferential direction when meshing and rotating.

  One of the pair of stoppers is positioned on an arc having a larger diameter than the pitch circle of the one gear having the stopper, and the other stopper is positioned on an arc having a smaller diameter than the pitch circle of the other gear having the stopper. It is practical.

  The pair of meshing gears may have a mode in which the number of teeth is the same, but if the number of teeth is different, the stopper position (the relative rotational phase of the pair of meshing gears until the stop is applied) gives freedom. be able to.

  Similarly, when at least one of the number of teeth of the pair of meshing gears is an odd number, a degree of freedom can be given to the stopper position (the relative rotational phase of the pair of meshing gears until the stop is applied).

  In the gear rotation control device of the present invention, at least one stopper is formed integrally with a pair of gears meshed with each other at different axial positions, and each of the pair of stoppers is the center of the meshing gear having the stopper. When the pair of meshing gears rotate in mesh with each other, they are formed in a positional relationship in which they contact each other from the circumferential direction. There is nothing (less). For this reason, since it is not necessary to enlarge a bearing mechanism and a big space is not required for a pair of stopper, a small rotation control device can be obtained.

(A), (B) is a top view of a mutually different stop state which shows one Embodiment of the rotation control apparatus of the gearwheel which concerns on this invention. It is a side view of FIG.

  1 and 2 show an embodiment of a gear rotation control device according to the present invention. This embodiment is an embodiment in which the present invention is applied to a gear mechanism including a pinion 10 having 8 teeth as a first gear and a gear 20 having 37 teeth as a second gear meshing with the pinion 10. . The pinion 10 and the gear 20 are ordinary gears, and the addendum portion and the dendendam portion as in Patent Document 1 are not formed.

  The pinion 10 is provided with a single stopper arm 12 that is integral with the shaft 11 and has an axial position different from that of the pinion 10 and extends on the side surface of the gear 20. A stopper 13 is provided at the tip of the stopper arm 12. Is formed (see FIG. 2). The distance D from the shaft 11 of the stopper 13 is sufficiently larger than the pitch circle of the pinion 10.

  A pair of stopper projections 22 and 23 are formed on the side surface of the gear 20 so as to protrude from the shaft 21 on the same radial distance d (arc of radius d) at different positions in the circumferential direction. The pair of stopper protrusions 22 and 23 are stoppers formed at an equal distance from the shaft 21 so as to be integrated with the gear 20 with different positions in the axial direction from the gear 20. The distance d of the stopper protrusions 22 and 23 from the shaft 21 is sufficiently smaller than the pitch circle of the gear 20.

  The stopper 13 of the pinion 10 and the stopper protrusions 22 and 23 of the gear 20 are in a radial position where they contact (collision) from the circumferential direction when the pinion 10 and the gear 20 rotate in mesh with each other, and the pinion 10 The position is set so that the rotation angle is correctly limited to one rotation.

  This will be specifically described. FIG. 1 (A) shows a state where the first teeth 10-1 of the pinion 10 are located between the first teeth 20-1 and the second teeth 20-2 of the gear 20. At this time, the stopper 13 of the pinion 10 is in contact with one side (left in the figure) of the stopper projection 22 of the gear 20, and the pinion 10 cannot be rotated counterclockwise from this state. In other words, the counterclockwise rotation of the pinion 10 is restricted (stopped). In this state, when the pinion 10 is rotated clockwise, the stopper 13 comes into contact with the stopper protrusion 23 when the stopper arm 12 (stopper 13) rotates once around the shaft 11 in the end. At this time, the first tooth 10-1 of the pinion 10 is located between the ninth tooth 20-9 and the tenth tooth 20-10 of the gear 20, and when the pinion 10 makes one correct rotation, it rotates clockwise. Is restricted (stopped) (FIG. 1B).

  In the example of FIG. 1, in order to control the rotation angle of the pinion 10 to another angle, the positions of the stopper protrusions 22 and 23 on the gear 20 may be changed. For example, when the rotation angle of the pinion 10 from the position of FIG. 1A is set to 2 rotations, the stopper protrusion 23 on the gear 20 may be formed at a position where the stopper 13 of the pinion 10 rotated twice contacts.

  Although the above discussion has focused on the rotation angle of the pinion 10, the positions of the stopper 13 and the stopper protrusions 22 and 23 can be set by focusing on the rotation angle of the gear 20. Further, the above is a discussion when the stopper 13 is provided at a distance D from the rotation center of the pinion 10 and the stopper protrusions 22 and 23 are provided at a distance d from the rotation center of the gear 20. The relative rotation angle between the pinion 10 and the gear 20 can also be changed (set) by changing d.

  In the above embodiment, the principle of the present invention is described by taking two gears 10 and 20 having a specific number of teeth as an example. However, the present invention is based on the initial meshing phase of the two gears 10 and 20 in the illustrated embodiment. It is possible to change the stop position (relative rotation amount) of the relative rotation by changing the number of teeth or the number of teeth.

10 Pinion (gear)
11 Shaft 12 Stopper arm 13 Stopper 20 Gear 21 Shaft 22 23 Stopper protrusion (stopper)

Claims (4)

A pair of gears meshing with each other; and at least one stopper formed integrally with each of the pair of gears at different axial positions;
Have
Each of the pair of stoppers is on a circular arc centered on the center of the meshing gear having the stopper, and is formed in a positional relationship in which the pair of meshing gears come into contact with each other in the circumferential direction when meshing and rotating. A gear rotation control device characterized by the above. 2. The gear rotation control device according to claim 1, wherein one of the pair of stoppers is located on an arc having a diameter larger than the pitch circle of the one gear having the stopper, and the other stopper has the other having the stopper. Rotation control device for a gear located on an arc having a smaller diameter than the pitch circle of the gear. The gear rotation control device according to claim 1 or 2, wherein the pair of meshing gears has a different number of teeth. 4. The gear rotation control device according to claim 3, wherein at least one of the pair of meshing gears has an odd number of teeth.

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