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CN-114562552-B - Resin gear and gear device

CN114562552BCN 114562552 BCN114562552 BCN 114562552BCN-114562552-B

Abstract

The invention aims to improve the strength of a resin gear of a gear device. A1 st internal gear (22 g) and a 2 nd internal gear (23 g) are formed by using a molding material obtained by mixing reinforcing fibers (f) with a matrix resin (r), and the reinforcing fibers are arranged along tooth surfaces and the fiber direction is irregular on the engagement surfaces (221 b, 231 b) of the teeth. Or the engagement surfaces (221 b, 231 b) of the teeth are provided with reinforcing fibers arranged along the tooth surfaces, and the fiber directions of the reinforcing fibers are irregular in the deep part (d) overlapped with the tooth surfaces when seen from the circumferential direction. The reinforcing fibers along the engagement surfaces (221 b, 231 b) help to increase the strength of the engagement surfaces (221 b, 231 b).

Inventors

  • TAMURA MITSUNOBU
  • WATANABE MASAHIRO
  • TOSHIAKI MATOBA

Assignees

  • 住友重机械工业株式会社

Dates

Publication Date
20260508
Application Date
20211101
Priority Date
20201127

Claims (7)

  1. 1. A resin gear molded by using a molding material obtained by mixing reinforcing fibers with a matrix resin, characterized in that, The engaging surface of each tooth contains reinforcing fibers arranged along the tooth surface, and the fiber direction of the reinforcing fibers located in the tooth surface is along the tooth surface and is directed in an irregular direction in the tooth surface, In a deep portion overlapping the tooth surface when viewed from the circumferential direction, the fiber direction of the reinforcing fiber is irregular in the three-dimensional direction.
  2. 2. The resin gear according to claim 1, wherein, In the tooth surface, a boundary of a region of the reinforcing fiber along the tooth surface and a region of the reinforcing fiber not along the tooth surface is displayed.
  3. 3. The resin gear according to claim 1 or 2, wherein, The proportion of reinforcing fibers along the tooth surface of the engagement surface is smaller than the proportion of reinforcing fibers along the tooth surface of the engagement surface on the tooth surface of the engagement surface at a central position between a deep portion overlapping with the tooth surface of the engagement surface and the tooth surface of the engagement surface when viewed from the circumferential direction.
  4. 4. The resin gear according to claim 3, wherein, In the deep portion, the proportion of reinforcing fibers along the tooth surface of the engagement surface is smaller than the proportion of reinforcing fibers along the tooth surface of the engagement surface at the central position.
  5. 5. The resin gear according to claim 1 or 2, wherein, The tooth top surface of each tooth includes reinforcing fibers arranged along the tooth top surface.
  6. 6. The resin gear according to claim 1 or 2, wherein, The axial end face of each tooth includes reinforcing fibers disposed along the axial end face.
  7. 7. A gear device having an internal gear and an external gear, characterized in that, One of the internal gear and the external gear is constituted by the resin gear according to any one of claims 1 to 6, The other gear of the inner gear and the outer gear is made of metal.

Description

Resin gear and gear device The present application claims priority based on japanese patent application No. 2020-196636 filed on the first month of 11 and 27 in 2020. The entire contents of this japanese application are incorporated by reference into this specification. Technical Field The present invention relates to a resin gear and a gear device. Background In recent years, in accordance with the demand for weight reduction, gear devices using gears formed of resin have been proposed. In such a resin gear, in order to improve strength, reinforcing fibers are mixed in a matrix resin, and fiber directions of the reinforcing fibers are made to be along tooth surfaces and in directions in engagement surfaces of the teeth, and the fiber directions are made irregular in the tooth roots (for example, refer to patent document 1). Patent document 1 Japanese patent application laid-open No. 2019-218994 However, the resin gear of patent document 1 has room for improvement in terms of strength. Disclosure of Invention The invention aims to improve the strength of a resin gear and a resin gear of a gear device. The present invention provides a resin gear molded by using a molding material obtained by mixing reinforcing fibers with a matrix resin, On the engagement surface of each tooth, the reinforcing fibers are arranged along the tooth surface and the fiber direction is irregular. The present invention also provides a resin gear molded by using a molding material obtained by mixing reinforcing fibers with a matrix resin, wherein the reinforcing fibers are disposed along tooth surfaces on the engagement surfaces of the teeth, and the fiber directions of the reinforcing fibers are irregular in deep portions overlapping the tooth surfaces when viewed from the circumferential direction. Further, the present invention provides a gear device having an internal gear and an external gear, wherein, One of the internal gear and the external gear is composed of the above-mentioned resin gear, The other of the inner gear and the outer gear is made of metal. According to the present invention, the strength of the resin gear and the resin gear of the gear device can be improved. Drawings Fig. 1 is an axial cross-sectional view showing a flexible meshing gear device according to an embodiment of the present invention. Fig. 2 is a view of one tooth of an internal gear of the flex-mesh gear device as seen from the axial direction. Fig. 3 is a diagram showing the directions of reinforcing fibers in the matrix resin on the tooth surface of the engagement surface in fig. 2, that is, the surface cut along the U-U line. Fig. 4 is a cross-sectional view of the tooth surface of fig. 2 taken along line V-V. Fig. 5 is a cross-sectional view along a plane taken along the line W-W through the deep portion in fig. 2. Fig. 6 is a view of one tooth of the internal gear of the flex-mesh gear device as seen from the axial direction. Fig. 7 is a view showing the direction of reinforcing fibers in the matrix resin on the tooth top surface in fig. 6, that is, the surface cut along the L-L line. Fig. 8 is a cross-sectional view of the tooth tip surface of fig. 6 taken along line M-M. Fig. 9 is a cross-sectional view taken along line N-N of fig. 6 on the inner side of the tooth top surface. Fig. 10 is a diagram showing the direction of reinforcing fibers in the matrix resin in the rectangular region S in the axial end face shown in fig. 2. In the figure, 1-gear means, 12-external gear, 23-internal gear member, 221, 231-teeth, 221a, 231 a-tooth top surface, 221b, 231 b-mesh surface, 221c, 231 c-tooth bottom surface, O1-rotation axis, d-deep, f-reinforcing fiber, h/2-intermediate point, r-matrix resin. Detailed Description [ Schematic structure of embodiment ] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a cross-sectional view showing a gear device (i.e., a flexible meshing gear device) according to an embodiment. Hereinafter, a direction along the rotation axis O1 in the drawing is defined as an "axial direction", a direction perpendicular to the rotation axis O1 is defined as a "radial direction", and a rotation direction around the rotation axis O1 is defined as a "circumferential direction". As shown in fig. 1, the flexible meshing gear device 1 is a cylindrical flexible meshing gear device in which an external gear 12 (gear 2) is deformed and deformed to transmit a rotational motion about a rotational axis O1. Specifically, the flex-meshing gear device 1 includes a vibrator shaft 10, an external gear 12 that is flexed by the vibrator shaft 10, a1 st internal gear 22g and a2 nd internal gear 23g that mesh with the external gear 12, and a vibrator bearing 15. The flexible meshing gear device 1 further includes a1 st housing 22, an internal gear member 23, a2 nd housing 24, a1 st housing 26, a2 nd housing 27, an input bearing 31, an input bearing 32, and a main bear