Rear arm for motorcycle
First Claim
1. A rear arm for a motorcycles comprising:
- left and right arm molded bodies made of aluminum alloy die-cast, which are formed by dividing pivot sections and cross member sections into left and right parts along a body central line, and obtained by weld-bonding the left and the right arm molded bodies in the pivot sections and the cross member sections, and left and the right arm sections formed in substantially a triangular shape viewed from sides of the motorcycle and formed in substantially a C shape opening toward an inner side in a width direction of the viewed from sides of the motorcycle in cross section, wherein the cross member sections are formed in vertically long closed sectional shape and have rear vertical walls of an arc shape extending along a front edge of a rear wheel viewed from sides of the motorcycle.
1 Assignment
0 Petitions
Accused Products
Abstract
A rear arm 15 for a motorcycle obtained by weld-bonding left and right arm molded bodies 2 and 3 made of aluminum alloy die-cast, which are formed by dividing pivot sections 2b and 3b and cross member sections 2c and 3c into left and right parts along a body central line, in the pivot sections and the cross member sections is provided, in which left and the right arm sections 2a and 3a are formed in substantially a triangular shape in side view and formed in substantially C shape opening toward an inner side in a width direction of the vehicle in cross-sectional view, and the cross member sections 2c and 3c are formed in a closed sectional shape extending from vertexes 2g and 3g of the triangular shapes to bases thereof.
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Citations
20 Claims
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1. A rear arm for a motorcycles comprising:
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left and right arm molded bodies made of aluminum alloy die-cast, which are formed by dividing pivot sections and cross member sections into left and right parts along a body central line, and obtained by weld-bonding the left and the right arm molded bodies in the pivot sections and the cross member sections, and left and the right arm sections formed in substantially a triangular shape viewed from sides of the motorcycle and formed in substantially a C shape opening toward an inner side in a width direction of the viewed from sides of the motorcycle in cross section, wherein the cross member sections are formed in vertically long closed sectional shape and have rear vertical walls of an arc shape extending along a front edge of a rear wheel viewed from sides of the motorcycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for manufacturing a rear arm for a motorcycle, comprising:
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casting by using die-cast molds having plural molten inlets, left and right arm molded bodies made of aluminum alloy, which are formed by dividing pivot sections and cross member sections into left and right parts along a body central line, and obtained by weld-bonding the left and the right arm molded bodies in the pivot sections and the cross member sections;
forming the left and the right arm sections in substantially a triangular shape viewed from sides of the motorcycle and in substantially a C shape opening toward an inner side in a width direction of the viewed from sides of the motorcycle in cross section; and
forming the cross member sections in a vertically long closed sectional shape and having rear vertical walls of an arc shape extending along a front edge of a rear wheel viewed from sides of the motorcycle.
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20. A method for manufacturing a rear arm for a motorcycle, comprising:
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casting by using die-cast molds having plural molten inlets, left and right arm molded bodies made of aluminum alloy, which are formed by dividing pivot sections and cross member sections into left and right parts along a body central line, and obtained by weld-bonding the left and the right arm molded bodies in the pivot sections and the cross member sections;
forming the left and the right arm sections in substantially a triangular shape viewed from sides of the motorcycle and in substantially a C shape opening toward an inner side in a width direction of the viewed from sides of the motorcycle in cross section;
forming the cross member sections in a vertically long closed sectional shape and having rear vertical walls of an arc shape extending along a front edge of a rear wheel viewed from sides of the motorcycle; and
forming front vertical walls such that lengthwise spaces between the front vertical walls and the rear vertical walls are minimized in intermediate parts in a vertical direction and are widened toward upper or lower parts thereof.
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Specification