JPS6111108Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the floor structure of the tail cab of a freight vehicle.The purpose of the invention is to reduce the number of connecting components of the front cross member, main sill, and cab hinge bracket, and to reduce the number of welding points. This not only improves cost and productivity, but also improves the strength and rigidity of the joint.

As shown in FIG. 1, the tail cab 1 is pivoted to the chassis frame 2 so that the front lower part of the cab 1 can be flipped up in a forward tilting direction by a tail center 3 formed by a tail hinge bracket 10.

The floor structure of this cab 1 has a main sill 5 installed vertically across a front cross member 11 and a rear cross member 6, a floor panel 4 attached to the top surface of the main sill 5, and a rear cross member 6 mounted on the top surface of the floor panel 4. installed. Reference numeral 8 in FIG. 1 is a rear arch that is fixed to the chassis frame 2, and has a mount rubber 7 that supports the cab 1 in a proper position via a bracket 9.

Conventionally, the front cross member 11
The connection structure between the main sill 5 and the cab hinge bracket 10 was as shown in FIG.

That is, the front cross member 11 and the main sill 5 are connected by spot and arc welding using an upwardly U-shaped stiffener 12 having a flange 12a on the upper surface and a flange 12b on the end surface in a vertical plane of the front cross member 11. Then, a reinforcing connecting member 13 perpendicular to the connecting corner is connected, the tip of the main sill 5 is fitted and welded to the stiffener 12, and a downward U-shaped cab hinge bracket 10 is attached to the lower surface of the stiffener 12. The main sill 5 and the cab hinge bracket 10 are sandwiched between the stiffener 12 and the main sill 5 and the cab hinge bracket 10, and are fastened together with weld nuts and bolts. Further, the stiffener 12 and the front cross member 11 are joined by arc welding using a connecting member 14 bent into a hook shape for joint reinforcement, and a connecting member 15 is used to connect the stiffener 12 and the cab hinge bracket 10 between the sides. They are joined by arc welding.

Therefore, the components of this part include the main components of the front cross member 11, the main sill 5, and the cab hinge bracket 10, as well as the stiffener 1.
2. Reinforcement connecting member 13, connecting members 14 and 15 4
It requires several parts, and is made up of seven parts in total. Although the joint between the main sill 5 and the front cross member 11 requires strength and rigidity, the number of parts required for this purpose is too large, making it difficult to reduce weight and cost, and requiring many welding points. There was a problem with productivity.

The present invention provides a floor structure that solves the above conventional problems, and is made up of four parts in total, providing strength and
It is characterized by its highly rigid structure, low cost, and improved productivity.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 6.

The front cross member 11 forms a rearwardly convex protruding surface 11a on its longitudinal surface. A flange 5b formed at the tip of the main sill 5 is brought into contact with this protruding surface 11a and connected by spot welding. Next, a pair of reinforcing members 16 are joined to both sides of the main sill 5 by spot welding. This reinforcing member 16 has a flange 16a formed on its entire circumferential surface, and has a flange 16a formed on the protruding surface 1 of the front cross member 11.
An uneven surface portion 16b that fits along the front cross member 1a is formed, and this uneven surface portion 16b is also joined to the protruding surface 11a of the front cross member 11 by spot welding. Further, a downward U-shaped cab hinge bracket 10 is connected between the lower surface of the main sill 5 and the inner surfaces of both reinforcing members 16 by spot welding.

The flange 5a on the upper surface of the main sill 5 and the flange 16a on the upper surface of the reinforcing member 16 are lapped 17 at the joint to form a continuous surface, to which the floor panel 4 is attached.

As described above, the present invention has four components including the front cross member 11, main sill 5, cab hinge bracket 10, and reinforcing member 16.
It is composed of three parts, and compared to the conventional structure described above, three parts have been reduced. In addition, spot welding is sufficient for all parts to be joined, and conventional arc welding is omitted, improving productivity and reducing costs.

Further, reinforcing members 16 are coupled to both sides of the main sill 5 whose end face is coupled to the front cross member 11 by the flange 5b, and the reinforcing members 16 are connected to the protruding surface 11 formed on the front cross member 11.
Since the front cross member 11 is connected to the front cross member 11 in a concave-convex manner with the concave-convex surface 16b, the strength and rigidity of not only the front cross member 11 itself but also the joint portion is ensured.

As described above, the structure of the present invention has the advantage of being able to provide a low-cost floor structure that is lightweight, has high productivity, has high strength and rigidity, and has a very small number of parts.

[Brief explanation of the drawing]

Fig. 1 is a side view of the tail cab, Fig. 2 is a perspective view of the joint between the front cross member and main sill in a conventional floor structure, Fig. 3 is a side sectional view of the present invention, and Fig. 4 is Fig. 3- FIG. 5 is a cross-sectional view taken along lines taken from FIG. 3, and FIG. 6 is a perspective view of the present invention. 1... Cab, 4... Floor panel, 5... Main sill, 5a, 5b... Flange, 10... Cab hinge bracket, 16a... Flange, 1
6b...Uneven surface portion, 11...Front cross member, 11b...Protruding surface, 16...Reinforcing member.

Claims (1)

[Scope of utility model registration request] A front cross member, which is a floor component of a tail cab that is pivotally connected to the chassis frame so as to be tiltable, and a main sill that is orthogonally connected to this front cross member, are arranged rearwardly on the longitudinal surface of the front cross member that the main sill abuts. A protruding surface is formed toward the protruding surface, and the end face of the main sill is flange-bonded to this protruding surface, and reinforcing members having flanges formed around the entire periphery on both sides of the main sill are coupled, and the protruding surface is fitted with a concave-convex surface. A downward U-shaped cab hinge bracket is coupled to the lower surface of the main sill and both inner surfaces of the reinforcing member, and a floor panel is attached to the cab hinge bracket and the upper surface of the main sill. The floor structure of the tail cab.