Manufacturing method of body frame

Patent metadata

Field	Value
Publication number	US-11110986-B2
Application number	US-202017067207-A
Country	US
Kind code	B2
Filing date	Oct 9, 2020
Priority date	Oct 11, 2019
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A plurality of main frame members that are commonly usable for a plurality of types of straddled vehicles are fabricated. Left and light pivot shaft supporting portions are provided in each main frame member. The left and right pivot shaft supporting portions include left and right hole formable portions in which left and right pivot holes are formable and which have areas larger than an area of a head portion of a pivot shaft, respectively. One of the pivot shaft supporting portions includes a rotation restricting portion that restricts rotation of the head portion of the pivot shaft inserted into the pivot hole. The pivot holes are respectively formed at predetermined positions at pivot shaft supporting portions of each main frame member, and the predetermined positions are different in accordance with a type of a vehicle for which each main frame member is to be used.

First claim

What is claimed is:

1. A manufacturing method of a body frame, including:
fabricating a plurality of main frame members that are commonly usable for a plurality of types of straddled vehicles; and
forming a left pivot hole and a right pivot hole between which a pivot shaft is attachable in each main frame member, wherein
said each main frame member includes a left pivot shaft supporting portion and a right pivot shaft supporting portion,
each pivot shaft supporting portion including a hole formable portion which has an area larger than an area of a head portion of the pivot shaft,
at least one of the left pivot shaft supporting portion and the right pivot shaft supporting portion including a rotation restricting portion that restricts rotation of the head portion of the pivot shaft inserted into the left and right pivot holes,
the forming a left pivot hole and a right pivot hole in said each main frame member includes respectively forming the left and right pivot holes at predetermined positions within areas of the left and right pivot shaft supporting portions of said each main frame member, the predetermined positions being different in accordance with a type of a straddled vehicle for which said each main frame member is to be used, and
the rotation restricting portion is a dent formed such that the head portion of the pivot shaft is fittable into the dent with the pivot shaft inserted into the left and right pivot holes, the dent having an inner peripheral surface that surrounds the head portion and when a rotational force acts on the pivot shaft, abuts against a part of the head portion to restrict the rotation of the pivot shaft with the pivot shaft inserted into the left and right pivot holes.

2. The manufacturing method of the body frame according to claim 1 , wherein
said each main frame member constitutes a head pipe, and includes left and right main rails that are in a pair and, from the head pipe, respectively extend rearwardly and downwardly while spreading leftwardly and rightwardly,
the hole formable portion is formed at each of the left and right pivot shaft supporting portions of the left and right main rails, the left and right pivot shaft supporting portions facing each other, and
the rotation restricting portion is formed at the hole formable portion of one of the left and right main rails.

3. A manufacturing method of a body frame, comprising:
fabricating a plurality of main frame members that are commonly usable for a plurality of types of straddled vehicles; and
forming a left pivot hole and a right pivot hole between which a pivot shaft is attachable in each main frame member, wherein
said each main frame member includes a left pivot shaft supporting portion and a right pivot shaft supporting portions,
each pivot shaft supporting portion including a hole formable portion which has an area larger than an area of a head portion of the pivot shaft,
at least one of the left pivot shaft supporting portion and the right pivot shaft supporting portion including a rotation restricting portion that restricts rotation of the head portion of the pivot shaft inserted into the left and right pivot holes,
the forming a left pivot hole and a right pivot hole in said each main frame member includes respectively forming the left and right pivot holes at predetermined positions within areas of the left and right pivot shaft supporting portions of said each main frame member, the predetermined positions being different in accordance with a type of a straddled vehicle for which said each main frame member is to be used,
the head portion of the pivot shaft has an oblong shape,
the rotation restricting portion is formed such that the head portion of the pivot shaft is fittable into the rotation restricting portion, and has a first length in a first direction and a second length in a second direction orthogonal to the first direction,
the first length in the first direction of the rotation restricting portion is larger than a maximum dimension of the head portion of the pivot shaft, and
the second length in the second direction of the rotation restricting portion is smaller than the maximum dimension of the head portion of the pivot shaft.

4. The manufacturing method of the body frame according to claim 1 , wherein
said each pivot shaft supporting portion of said each main frame member further includes a reinforcing portion that surrounds the hole formable portion and projects sidewardly of said each main frame member.

5. A manufacturing method of a body frame, comprising:
fabricating a plurality of main frame members that are commonly usable for a plurality of types of straddled vehicles; and
forming a left pivot hole and a right pivot hole between which a pivot shaft is attachable in each main frame member, wherein
said each main frame member includes a left pivot shaft supporting portion and a right pivot shaft supporting portions,
each pivot shaft supporting portion includes a hole formable portion which has an area larger than an area of a head portion of the pivot shaft,
at least one of the left pivot shaft supporting portion and the right pivot shaft supporting portion includes a rotation restricting portion that restricts rotation of the head portion of the pivot shaft inserted into the left and right pivot holes, and
the forming a left pivot hole and a right pivot hole in said each main frame member includes respectively forms the left and right pivot holes at predetermined positions within areas of the left and right pivot shaft supporting portions of said each main frame member, the predetermined positions being different in accordance with a type of a straddled vehicle for which said each main frame member is to be used,
the manufacturing method of the body frame further comprising:
attaching a rear frame member to said each main frame member; and
painting said each main frame member and the rear frame member after attaching the rear frame member to said each main frame member.

6. A manufacturing method of a body frame, comprising:
fabricating a plurality of main frame members that are commonly usable for a plurality of types of straddled vehicles; and
forming a left pivot hole and a right pivot hole between which a pivot shaft is attachable in each main frame member, wherein
said each main frame member includes a left pivot shaft supporting portion and a right pivot shaft supporting portions,
each pivot shaft supporting portion includes a hole formable portion which has an area larger than an area of a head portion of the pivot shaft,
at least one of the left pivot shaft supporting portion and the right pivot shaft supporting portion includes a rotation restricting portion that restricts rotation of the head portion of the pivot shaft inserted into the left and right pivot holes,
the forming a left pivot hole and a right pivot hole in said each main frame member includes respectively forming the left and right pivot holes at predetermined positions within areas of the left and right pivot shaft supporting portions of said each main frame member, the predetermined positions being different in accordance with a type of a straddled vehicle for which said each main frame member is to be used,
said each main frame member constitutes a head pipe, and includes left and right main rails that are in a pair and, from the head pipe, respectively extend rearwardly and downwardly while spreading leftwardly and rightwardly,
the hole formable portion is formed at each of the left and right pivot shaft supporting portions of the left and right main rails, the left and right pivot shaft supporting portions facing each other, and
the rotation restricting portion is formed at only the left hole formable portion of the left main rail or the right hole formable

Assignees

• Yamaha Motor Co Ltd

Inventors

• Maeda Tomohito

Classifications

• B62K5/02

  Tricycles (children's tricycles B62K9/02) · CPC title

• B62K19/30 Primary

  Frame parts shaped to receive other cycle parts or accessories (axle suspensions B62K25/00) · CPC title

• B23P19/04

  for assembling or disassembling parts · CPC title

• B62K11/04

  characterised by the engine being between front and rear wheels · CPC title

• B62J6/056

  characterised by control means · CPC title