Impeller for fluid transmitting device and method of manufacturing the same
First Claim
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1. An impeller for a fluid transmitting device, comprising:
- a hub;
a bowl-shaped shell connected to an outer peripheral portion of the hub via an annular weld seam; and
a plurality of blades rising from an inner peripheral surface of the shell, wherein the inner peripheral surface of the shell is fitted to an outer peripheral surface of the hub, and the weld seam is formed therebetween by laser welding over an entire length of fitting depth.
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Abstract
An impeller for a fluid transmitting device includes a hub and a bowl-shaped shell connected to an outer peripheral portion of the hub via an annular weld seam. An inner peripheral surface of the shell is fitted to an outer peripheral surface of the hub, and the weld seam is formed therebetween by laser welding over an entire length of fitting depth. Thus, it is possible to form the annular weld seam between the hub and the shell with a relatively small amount of heat input, and to precisely perform a visual inspection as to whether the weld seam is good or not without any skill.
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Citations
5 Claims
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1. An impeller for a fluid transmitting device, comprising:
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a hub;
a bowl-shaped shell connected to an outer peripheral portion of the hub via an annular weld seam; and
a plurality of blades rising from an inner peripheral surface of the shell, wherein the inner peripheral surface of the shell is fitted to an outer peripheral surface of the hub, and the weld seam is formed therebetween by laser welding over an entire length of fitting depth.
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2. An impeller for a fluid transmitting device, comprising:
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a hub;
a bowl-shaped shell connected to an outer peripheral portion of the hub via an annular weld seam; and
a plurality of blades rising from an inner peripheral surface of the shell, wherein an inner peripheral surface of a cylindrical boss formed at an inner peripheral end of the shell is fitted to an outer peripheral surface of the hub, and the weld seam is formed therebetween by laser welding over an entire length of fitting depth.
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3. A method of manufacturing an impeller for a fluid transmitting device, comprising the steps of:
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arranging annularly a plurality of blades on an inner surface of a bowl-shaped shell;
fixing temporally by welding an annular retainer plate on the inner surface of the shell to retain radially inner ends of the blades;
brazing the blades and the retainer plate to the inner surface of the shell; and
welding a hub to a central portion of the shell, wherein the welding is performed by superposing the retainer plate on the inner surface of the shell, and forming a weld seam between the retainer plate and the shell by applying a laser beam from the side of the retainer plate. - View Dependent Claims (4, 5)
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Specification