Pulley with two flanges, and method of producing pulley with two flanges

Patent metadata

Field	Value
Publication number	US-12480569-B2
Application number	US-202318105098-A
Country	US
Kind code	B2
Filing date	Feb 2, 2023
Priority date	Feb 8, 2022
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A pulley body has a first flange and a fitting protrusion. The flange body has a second flange and a fitting recess fitted to the fitting protrusion. The fitting recess has an inner surface including, in a radially inward direction, a first inclined surface inclined so as to approach the first flange, as extending in the radially inward direction. The fitting protrusion has a distal end surface including, in the radially inward direction, a second inclined surface facing the first inclined surface. The flange body has an outer peripheral surface that faces an inner peripheral surface of the pulley body, and has a protrusion which continues in a circumferential direction with no end. A region including an annular-shaped area between the first and second inclined surfaces includes a joint portion of a molten resin.

First claim

The invention claimed is:

1 . A pulley with two flanges comprising:
a pulley body; and a flange body joined to the pulley body in a male-female fitting manner; wherein the pulley body includes:
a first flange that protrudes outward in a radial direction perpendicular to a rotation axis, at a first end of the pulley body in an axial direction parallel to the rotation axis; and
a fitting protrusion that has an annular shape and protrudes in the axial direction, at a second end of the pulley body in the axial direction;
wherein the flange body:
is positioned in the second end of the pulley body in the axial direction;
has a second flange that protrudes outward in the radial direction; and
has a fitting recess that is fitted to the fitting protrusion, is hollowed in the axial direction, and has an annular shape,
the fitting recess has an annular inner surface including, inward in the radial direction, a first inclined surface that has a shape of a side surface of a truncated cone, the first inclined surface being inclined so as to approach the first end of the pulley body in the axial direction as extending inward in the radial direction, the fitting protrusion has a distal end surface including, inward in the radial direction, a second inclined surface that faces the first inclined surface, the flange body has an outer peripheral surface that: is connected to an end portion, inward in the radial direction, of the first inclined surface; and faces an inner peripheral surface of the pulley body, the outer peripheral surface serving as a circumferential wall surface of the fitting recess and having one of a protrusion and a recessed groove, which has no end and continues in a circumferential direction, and a region including an annular-shaped area between the first inclined surface and the second inclined surface includes a joint portion of a molten resin, which is prevented from moving past the protrusion or the recessed groove, such that when the pulley body and flange body are joined together, weld burrs are prevented from being ejected by one of the protrusion and the recessed groove, wherein the cross-section of each of the protrusion and the recessed groove, cut by a plane including a rotation axis, is one of an arc-shape and a trapezoid, the trapezoid having two non-parallel opposing sides.

2 . A pulley with two flanges comprising:
a pulley body, and a flange body joined to the pulley body in a male-female fitting manner; wherein the pulley body includes:
a first flange that protrudes outward in a radial direction perpendicular to a rotation axis, at a first end of the pulley body in an axial direction parallel to the rotation axis; and
a fitting protrusion that has an annular shape and protrudes in the axial direction, at a second end of the pulley body in the axial direction;
wherein the flange body: is positioned in the second end of the pulley body in the axial direction; has a second flange that protrudes outward in the radial direction; and has a fitting recess that is fitted to the fitting protrusion, is hollowed in the axial direction, and has an annular shape, the fitting recess has an annular inner surface including, outward in the radial direction, a first inclined surface that has a shape of a side surface of a truncated cone, the first inclined surface being inclined so as to approach the first end of the pulley body in the axial direction as extending outward in the radial direction, the fitting protrusion has a distal end surface including, outward in the radial direction, a second inclined surface that faces the first inclined surface, the flange body has an inner peripheral surface that: is connected to an end portion, outward in the radial direction, of the first inclined surface; and faces an outer peripheral surface of the fitting protrusion of the pulley body, the inner peripheral surface serving as a circumferential wall surface of the fitting recess and having one of a protrusion and a recessed groove, which has no end and continues in a circumferential direction, and a region including an annular-shaped area between the first inclined surface and the second inclined surface includes a joint portion of a molten resin, which is prevented from moving past the protrusion or the recessed groove, such that when the pulley body and flange body are joined together, weld burrs are prevented from being ejected by one of the protrusion and the recessed groove, wherein the cross-section of each of the protrusion and the recessed groove, cut by a plane including a rotation axis, is one of an arc-shape and a trapezoid, the trapezoid having two non-parallel opposing sides.

3 . The pulley with two flanges according to claim 1 , wherein the flange body has an inner peripheral surface that is provided with one of a second protrusion and a second recessed groove, which has no end and continues in the circumferential direction, the inner peripheral surface facing an outer peripheral surface of the fitting protrusion of the pulley body.

4 . The pulley with two flanges according to claim 2 , wherein the flange body has an outer peripheral surface that is provided with one of a second protrusion and a second recessed groove, which has no end and continues in the circumferential direction, the outer peripheral surface facing an inner peripheral surface of the pulley body.

5 . A method of producing a pulley with two flanges, the pulley including a pulley body made of a synthetic resin and a flange body that is joined to the pulley body in a male-female fitting manner and is made of a synthetic resin, wherein
the pulley body includes:
a first flange that protrudes outward in a radial direction perpendicular to a rotation axis, at a first end of the pulley body in an axial direction parallel to the rotation axis; and
a fitting protrusion that has an annular shape and protrudes in the axial direction, at a second end of the pulley body in the axial direction, the flange body:
is positioned in the second end of the pulley body in the axial direction; has a second flange that protrudes outward in the radial direction; and has a fitting recess that is fitted to the fitting protrusion, is hollowed in the axial direction, and has an annular shape, the fitting recess has an annular inner surface including, inward in the radial direction, a first inclined surface that has a shape of a side surface of a truncated cone, the first inclined surface being inclined so as to approach the first end of the pulley body in the axial direction as extending inward in the radial direction, the fitting protrusion has a distal end surface including, inward in the radial direction, a second inclined surface that faces the first inclined surface, the flange body has an outer peripheral surface that: is connected to an end portion, inward in the radial direction, of the first inclined surface; and faces an inner peripheral surface of the pulley body, the outer peripheral surface serving as a circumferential wall surface of the fitting recess and having one of a protrusion and a recessed groove, which has no end and continues in a circumferential direction, and a region including an annular-shaped area between the first inclined surface and the second inclined surface includes a joint portion of a molten resin, which is prevented from moving past the protrusion or the recessed groove, such that when the pulley body and flange body are joined together, weld burrs are prevented from being ejected by one of the protrusion and the recessed groove, wherein the cross-section of each of the protrusion and the recessed groove, cut by a plane including a rotation axis, is one of an arc-shape and a trapezoid, the trapezoid having two non-parallel opposing sides, the method comprising: molding the pulley

Assignees

• Jtekt Corp
• Nakanishi Metal Works Co

Inventors

• Yamamori Ayumi
• Yamashita Shuhei
• Nakamura Masayoshi
• Taniguchi Ryotaro

Classifications

• F16H55/48

  manufactured exclusively or in part of non-metallic material, e.g. plastics  (F16H55/38, F16H55/42, F16H55/46 take precedence) · CPC title

• F16H55/36 Primary

  Pulleys (with features essential for adjustment F16H55/52) · CPC title