Gear device, plate, and method for manufacturing a gear device

Abstract

When forming a gear mechanism with multiple gears using resin, it is possible to minimize the reduction in dimensional accuracy. [Solution] The gear device 10 comprises a first gear 20 and a second gear 30. The first gear 20 comprises a plate 210 and teeth 222. The teeth 222 are located on the side surface 215 of the plate 210 and are formed using resin. The second gear 30 is located on the first surface 211 of the plate 210 and at least a portion of it is formed using resin. The plate 210 comprises a first opening 212 provided on the first surface 211, a second opening 214 provided on the second surface 213, a third opening 216 provided on the side surface 215, and a cavity 218. The cavity 218 connects the first opening 212, the second opening 214, and the third opening 216 and is filled with a resin part 224. The resin part 224, the teeth 222, and the resin portion of the second gear 30 are integrally formed.

Claims

1. A first gear comprising a plate and teeth located on the side surface of the plate and formed from resin, A second gear located on the first surface of the plate, at least a portion of which is made of resin, Equipped with, The aforementioned plate is The first opening provided on the first surface, A second opening is provided on the second surface, which is opposite to the first surface, A third opening provided on the aforementioned side surface, A cavity connecting the first opening, the second opening, and the third opening, It has, The aforementioned cavity is filled with resin. A gear apparatus in which the resin in the cavity, the teeth of the first gear, and at least a portion of the second gear are integrally formed.

2. In the gear apparatus according to claim 1, A gear mechanism in which the first gear and the second gear are concentric.

3. In the gear apparatus according to claim 2, The first circle connecting the tips of the teeth of the first gear is larger than the second circle connecting the tips of the teeth of the second gear. The edge of the plate follows the third circle, and the third circle is concentric with the first and second circles. The third circle is larger than the second circle and smaller than the first circle; this is a gear mechanism.

4. In the gear apparatus according to claim 3, A gear device in which the outer peripheral edge of the first surface of the plate and at least one of the peripheral edges of the side surface of the plate on the first surface side are not covered with resin.

5. In the gear apparatus according to any one of claims 1 to 4, The plate has a recess in the inner surface of the cavity that faces the third opening, A gear mechanism in which the recess is filled with the resin in the cavity.

6. In the gear apparatus according to any one of claims 1 to 4, The first opening, the cavity, and the second opening are through holes that penetrate the plate. The outer shape of the aforementioned plate is circular. A gear device in which the planar shape of the through hole is a shape that follows a circle concentric with the outer shape of the plate.

7. In the gear apparatus according to claim 6, A gear mechanism having multiple through holes.

8. In the gear apparatus according to any one of claims 1 to 4, The gear mechanism wherein the second opening is provided around the entire circumference of the side surface of the plate.

9. In the gear apparatus according to any one of claims 1 to 4, A gear mechanism in which the second surface of the plate is not covered with resin.

10. Used to form gear devices using resin, Page 1 and, The second surface is the surface opposite to the first surface, The side and, The first opening provided on the first surface, The second opening provided on the second surface, A third opening provided on the aforementioned side surface, A cavity connecting the first opening, the second opening, and the third opening, Equipped with, The first opening, the second opening, the third opening, and the cavity are provided for the passage of resin. The teeth of the first gear are formed on the aforementioned side surface using resin. A plate on which a second gear, at least a portion of which is made of resin, is formed.

11. The first step involves placing a plate inside a mold for forming a resin gear, A second step involves introducing resin into the mold and solidifying the resin to form a gear device, A third step involves removing the gear mechanism from the mold, Equipped with, The aforementioned plate is Page 1 and, The second surface is the surface opposite to the first surface, The side and, The first opening provided on the first surface, The second opening provided on the second surface, A third opening provided on the aforementioned side surface, A cavity connecting the first opening, the second opening, and the third opening, Equipped with, The gear device is A first gear located on the side surface of the plate and having teeth formed using the resin, A second gear located on the first surface of the plate, at least a portion of which is formed using the resin, Equipped with, In the second step described above, The resin flows in through the second opening and the cavity and then through the third opening, thereby forming the teeth. A method for manufacturing a gear device, wherein the resin flows in from the first opening through the second opening and the cavity, thereby forming at least a portion of the second gear.

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