Dog clutch

Patent metadata

Field	Value
Publication number	US-9518613-B2
Application number	US-201314406818-A
Country	US
Kind code	B2
Filing date	Apr 9, 2013
Priority date	Jun 15, 2012
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

A dog clutch that transmits driving force from a driving-side rotating body to a driven-side rotating body. In the bottom face of recessed parts formed in the driving-side rotating body there is a strip-shaped island part protruding from the bottom face in the circumferential direction, and there are groove parts between the island part and torque-receiving surfaces. The groove parts and the bottom face are formed by a forging mold, and their surfaces are forged mill scale. The island parts have a cut surface, which is formed by cutting the top part of the islands after they have been formed by the forging mold, and which receives the tip surface of a protruding part. The groove parts are formed so as to be deeper than the bottom face, and the cut surface is formed as to be shallower than the bottom face.

First claim

The invention claimed is:

1. A dog clutch having protruding parts provided on one of a driving-side rotating body and a driven-side rotating body and recessed parts provided in the other of the driving-side rotating body and the driven-side rotating body, the protruding parts being adapted to be brought into meshing engagement with the recessed parts to thereby transmit a driving force from the driving-side rotating body to the driven-side rotating body via abutting engagement between side surfaces of the protruding parts and corresponding torque-receiving surfaces of the recessed parts, wherein:
each of the recessed parts has a bottom face, a strip-shaped island part protruding from the bottom face and extending in a circumferential direction of the driving-side or driven-side rotating body, and groove parts between the island part and the torque-receiving surfaces, the island part receiving a tip surface of the protruding part when the protruding parts are brought into meshing engagement with the recessed parts, and the groove parts preventing top corners of each protruding part from interfering with base corners of a corresponding one of the recessed parts;
the groove parts and the bottom face are formed by a forging die and have respective surfaces as forged;
the island part has a cut surface, the cut surface being formed by cutting a top part of the island part after the island part has been formed by the forging die;
the groove parts are formed so as to be deeper than the bottom face, and the cut surface is formed so as to be shallower than the bottom face;
the torque-receiving surfaces include a first torque-receiving surface and a second torque-receiving surface that opposes the first torque-receiving surface, the island part extends between the first torque-receiving surface and the second torque-receiving surface so as to have a first end adjacent to the first torque-receiving surface and a second end adjacent to the second torque-receiving surface, and the groove parts include a first groove part disposed between the first end of the island part and the first torque-receiving surface, and a second groove part disposed between the second end of the island part and the second first torque-receiving surface; and
the first groove part is disposed immediately adjacent to the first end of the island part and the first torque-receiving surface, and the second groove part is disposed immediately adjacent to the second end of the island part and the second torque-receiving surface.

2. The dog clutch according to claim 1 , wherein the strip-shaped island part has one end and an opposite end that are rounded into a semicircular shape.

3. The dog clutch according to claim 1 , wherein the driving-side rotating body has a gear section formed on a radially outer side of the recessed parts, each of the recessed parts has a substantially trapezoidal shape and includes an arc-shaped inner edge contiguous with inner ends of the torque-receiving surfaces, and an arc-shaped outer edge contiguous with outer ends of the torque-receiving surfaces, the outer edge being formed to be longer than the inner edge, and the outer edge is connected to the bottom face via an arc-shaped surface having a radius of curvature equal to or greater than a depth of the bottom face.

4. The dog clutch according to claim 3 , wherein an arc-shaped surface formed between the outer edge and each of the torque-receiving surfaces has a radius of curvature larger than a radius of curvature of an arc-shaped surface formed between the inner edge and each of the torque-receiving surfaces.

Assignees

• Musashi Seimitsu Kogyo Kk
• Kyushu Musashi Seimitsu Co Ltd

Inventors

• Murata Daishi
• Tomimatsu Yoshihiro

Classifications

• F16D11/14 Primary

  with clutching members movable only axially (F16D11/02, F16D11/08 take precedence) · CPC title

• F16D2300/10

  Surface characteristics; Details related to material surfaces · CPC title

• F16D21/04

  with a shaft carrying a number of rotatable transmission members, e.g. gears, each of which can be connected to the shaft by a clutching member or members between the shaft and the hub of the transmission member · CPC title

• F16D2011/008

  characterised by the form of the teeth forming the inter-engaging parts; Details of shape or structure of these teeth · CPC title

• F16D11/10 Primary

  with clutching members movable only axially · CPC title