Railway rolling stock – Car framing and structure
Reexamination Certificate
1998-12-09
2001-03-06
Morano, S. Joseph (Department: 3617)
Railway rolling stock
Car framing and structure
C105S397000, C105S401000, C105S404000, C105S409000, C052S053000, C052S749100
Reexamination Certificate
active
06196136
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a car-body structure in which frame members are formed by press forming from a plate material, and a method of manufacturing the car-body, and a car using the car-body structure; and, more particularly, the invention relates to a car-body structure suitable for use as a side structure and an end structure of a rail-car, and a method of manufacturing the car-body structure.
BACKGROUND OF THE INVENTION
A conventional body structure for a rail-car, for example, a side structure, is manufactured by weld-joining a rocker rail, a side post, a belt rail, a window head, a window post, a door end post and so on.
Since the car-body structure is composed of many frame members, a frame formed in a one-piece structure is proposed in order to simplify the car-body structure.
In a car-body structure disclosed, for example, in Japanese Patent Application Laid-Open No.5-262228, a frame member is formed of corrugated plates divided into a plurality of sections and having a plurality of ribs, and the frame member is spot-welded to an outside plate. The frame member has holes on a surface in contact with the outside plate. Further, reinforcing members are welded and joined to the corrugated plates in a direction transversely intersecting with the corrugated plates.
In a car-body structure disclosed in Japanese Patent Application Laid-Open No.5-262227, ribs in the car-body structure according to the patent application are arranged so as to be staggered.
Further, in a car-body structure disclosed in Japanese Patent Application Laid-Open No.5-69823, a side structure is formed by joining a plurality of inner panels having projections and depressions formed by press working to a flat-plate outer panel to be used as an outside plate.
However, the above-mentioned car-body structures in, there is problem in that strain occurs and dimensional accuracy is degraded due to use of many kinds of members, a large number of parts and weld-joining of individual frame members.
Since the car-body structure disclosed in Japanese Patent Application Laid-Open No.5-262227 has a great number of long ribs in the longitudinal direction of the car-body, the stiffness of the car-body structure in the vertical direction is low. Therefore, additional posts are provided. Notches are provided in order to prevent the occurrence of wrinkles or cracks around a hole, which makes the manufacture complex.
In addition to this, since the reinforcing plate in each of the above cited references is fabricated by press working, strain is apt to occur and the surface flatness is degraded. When such a reinforcing plate is spot-welded to an outside plate, strain or unevenness occurs in the outside plate. Therefore, the dimensional accuracy is degraded, and, consequently, the assembling accuracy of the car-body is degraded.
The objective workpiece in each of, Japanese Patent Application Laid-Open No.5-262227, Japanese Patent Application Laid-Open No.5-262228 and Japanese Patent Application Laid-Open No.5-69823, has a side structure without a bending portion in a wainscot panel portion of the car-body. Therefore, the technology disclosed in each of the above-mentioned publication cannot be applied to a car-body having a bending portion in a wainscot panel portion of the car-body.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a car-body which is composed of a small number of structural members and has a high stiffness, and a method of manufacturing the car-body.
Another object of the present invention is to provide a car-body in which strain in the structural members is small, and the dimensional accuracy, and consequently, assembling accuracy of the car-body is high, and a method of manufacturing the car-body.
A further object of the present invention is to provide a method of manufacturing a car-body which can be applied to a car-body structure having a bending portion in a wainscot panel portion of the car-body.
A characteristic of the present invention is in the provision of a car in which at least one of a side block, a roof block and an end block is formed of a one-piece structure consisting of an outside plate and a reinforcing plate;
the reinforcing plate is composed of panels, the panel having a bead of a long and narrow projection formed by plastic working of a metal plate and extending in the longitudinal direction of the block, a hole extending along the bead and a bar-ring formed through plastic working around the hole, and a post-shaped protrusion extending in the direction intersecting at right angle with the longitudinal direction of the bead and the bar-ring;
the bead, the bar-ring and the post-shaped protrusion are projected in one side of the surface of the panel;
at least one end of the bead and the post-shaped protrusion is connected so as to form one and
the panel and the outside plate are joined in a unit. Another characteristic of the present invention is in the provision of a car in which at least one of a side block, a roof block and an end block is formed of a one-piece structure consisting of an outside plate and a reinforcing plate which are made of a metallic material;
the reinforcing plate is composed of panels, the panel having a bead of a long and narrow projection formed by plastic working of a metal plate and extending in the longitudinal direction of the block, and a post-shaped protrusion extending in the direction intersecting at right angle with the longitudinal direction of the bead;
at least one of the panels has a plurality of the beads;
each of the beads and the post-shaped protrusion are projected in one side of the surface of the panel;
the bead is formed through roll working under a compressing force as large as a load at the yield point or several times of the yield strength of a material the panel; and
the panel and the outside plate are joined in a unit.
A further characteristic of the present invention is in the provision of a car in which the side block has a bending portion in a wainscot panel portion, and a depression extending in a direction intersecting at a right angle with the longitudinal direction of the post-shaped protrusion is formed on the top surface of the post-shaped protrusion corresponding to the bending portion.
In the reinforcing plate in accordance with the present invention, the number of parts can be reduced since portions for maintaining the strength of the reinforcing plate, that is, beads, bar-rings and post-shaped protrusions, are formed in a one-piece structure. Further, since at least one end of the bead and the post-shaped protrusion in the reinforcing plate are connected so as to form one structure through plastic working, the strength of the reinforcing plate against a vertical force and a horizontal force acting on the connecting portion becomes strong and a high rigidity can be attained. Therefore, it is possible to provide a car having a small number of structural members and a high rigidity, and a method of manufacturing the car.
Furthermore, the reinforcing plate has a plurality of beads and bar-rings in parallel and post-shaped protrusions in a direction intersecting at right angle with the beads, and a compressing force as large as the load at the yield point or several times the yield strength of the material of the panel is applied to the reinforcing plate in the thickness direction of the material in order to form the beads. Therefore, it is possible to provide a car having a high rigidity in the reinforcing plate, small stress in the structural member, a high dimensional accuracy and, accordingly, a high assembling accuracy.
By providing a plurality of ribs having a depressing rib on the upper rib portion of the one-piece panel, it is possible to absorb the difference between inner and outer peripheral lengths caused by bending. Therefore, the structure can be applied to various type of cars, even to a car having a bending portion in the wainscot panel portion.
REFERENCES:
patent: 2314979 (1943-03-01), Gunn
patent: 2870723 (1959-01-01), Bock et al.
patent: 5267515 (1993-12-01
Igawa Yasunari
Yoshizaki Kiyoshi
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Jules Frantz F.
Morano S. Joseph
LandOfFree
Car and side structure for car and method of manufacturing... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Car and side structure for car and method of manufacturing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Car and side structure for car and method of manufacturing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2442985