JPH0735826Y2 - Heavy object support structure in chassis frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a heavy load supporting structure in a chassis frame of a truck or the like.

(Prior Art) A conventional chassis frame of a truck, in particular, a front portion thereof for supporting an engine is referred to FIG. 1 showing one embodiment of the present invention for the sake of convenience, and FIG. This will be described with reference to an enlarged front view as seen from the direction of arrow A in the figure). In the figure, reference numeral 10 is a pair of left and right side rails 12 extending in the vehicle front-rear direction, and the side rails 12 are respectively arranged in the vehicle width direction. Is a chassis frame composed of a plurality of cross members (not shown) fixed to the side rails 12 at both ends thereof. In the front part of the chassis frame 10, the vicinity of the front end of the engine 14 shown by the chain double-dashed line in the figure is supported via a bracket 16. As shown in the enlarged view of FIG. 4, the bracket 16 has a groove-shaped cross section, and a support base for mounting the front end portion of the engine 14 on a web portion 16w of the web portion 16w through an appropriate mounting device. 18 is fixed by welding or the like. Also,
The upper and lower flanges 16fu and 16fl of the bracket 16 are
Upper and lower flanges 12fu and 12 of the side rail 12 respectively
The inner surface of fl is in close contact with and abuts with rivets 20u and 20l, or bolts of the same effect, which are fastened and fixed.

The mounting surface of the mount 18 on which the mount device is mounted
A bolt hole 22 is formed in 18 'for inserting a mounting bolt.

(Problems to be solved by the invention) When a truck is loaded with cargo and travels on rough roads or uneven terrain with remarkable unevenness, from the bracket 16 supporting the engine having a large weight to the side rails 12 of the chassis frame 10 A large vertical bending load is transmitted to the
Due to this bending load, large stress is generated at the free edges of the upper and lower flanges 12fu and 12fl of the side rail. Particularly in the conventional configuration shown in FIG. 4, the bracket 16
Lower flange 16fl and side rail 12 lower flange 12
Since the fl and the fl are in full contact with each other, a large stress is generated in the vicinity of the free end of the lower flange 12fl of the side rail, and cracks or the like are likely to occur at the flange end portion of the bracket adjacent to the lower flange 16fl. . In such a case, it is customary to additionally arrange a reinforcing plate around the lower flange 12fl that abuts the lower flange 16fl of the bracket 16 and fix them with rivets or bolts for reinforcement, but the structure becomes complicated. As a result, the manufacturing cost is increased and the weight is increased.

In consideration of the above circumstances, the present invention has a simple structure, a low manufacturing cost, a lightweight structure, and an excellent durability by devising a structure for mounting a bracket for mounting a heavy load such as an engine on a side rail of a chassis frame. An object of the present invention is to provide a heavy load supporting structure in a chassis frame.

(Means for Solving the Problems) The heavy load supporting structure in the chassis frame according to the present invention is
It was created in order to achieve the above-mentioned object, and the upper and lower flanges of the bracket, which has a groove-shaped cross-section and is fixed to a support portion for mounting a heavy load such as an engine on the web portion, In the case where the frame is attached to the side rails having a groove-shaped cross section by rivets or bolts, a gap opened toward the inside of the vehicle body is formed on the contact surface between the lower flange of the bracket and the lower flange of the side rail. It is characterized by being provided.

(Operation) According to the present invention, the contact surface between the lower flange of the bracket supporting the heavy object and the lower flange of the side rail is
Since there is a gap that opens toward the inside of the vehicle body, the free end of the side rail lower flange where the high stress is likely to occur is released from the lower flange of the bracket by the above gap, allowing free deformation. And the generated stress is reduced.

(Embodiment) An embodiment of the present invention will be specifically described below with reference to FIGS. First, in the first embodiment of the present invention shown in FIGS. 1 and 2, the bracket 16 in which the support base 18 for supporting the front end portion of the engine 14 through the mount device 24 is fixed to the web portion 16w is The upper flange 16fu is fixed to the upper flange 12fu of the side rail 12 by a rivet (or bolt) 20u, and a mounting portion 16fl 'formed by bending the lower end of the lower flange 16fl upward is formed on the web of the side rail 12. It is fixed to 12w by rivets (or bolts) 20l, and a space S having a closed cross section is limited inside the side rail 12 and the bracket 16. Above bracket
As shown in FIG. 2, the lower flange 16fl of the 16 is bent at a substantially middle portion of the flange width, and only the horizontal portion outside the width direction of the flange abuts the lower flange 12fl of the side rail 12. 28, which is in contact with and slopes inward in the vehicle width direction
A wedge-shaped gap 30 that opens toward the inside of the vehicle body is formed between the side rail lower flange 12fl and the vicinity of the free end thereof. The mounting device 24 is fixed to the support base 18 by inserting a mounting bolt into a bolt hole 22 formed in the mounting surface 18 'of the support base 18 and screwing a nut in the same manner as in the conventional case.

In the above configuration, the chassis frame is used in a severe traveling state such as when the truck is loaded on a bad road at high speed.
A large bending load acts on the upper and lower directions of the side rail 12, and a large stress is originally likely to be generated at the upper flange 12fu and the lower flange 12fl of the side rail 12, especially at the free end of the latter, that is, the inner edge of the vehicle body. However, as described above, since the wedge-shaped gap 30 opened toward the inside of the vehicle body is provided on the contact surface between the lower flange 12fl of the side rail 12 and the lower flange 16fl of the bracket 16, the side rail 12 has The free end of the lower flange 12fl is the lower flange 16 of the bracket.
It is released from fl, in other words, free deformation is allowed without being restrained by the lower flange 16fl, and as a result, excessive stress is effectively avoided, and the conventional structure shown in FIG. In comparison, the stress generated at the free end of the lower flange 12fl is significantly reduced. Therefore, chassis frame
It is possible to effectively prevent breakage of the side rail 12 in the bracket mounting portion of 10 above, and improve durability and reliability, and at the same time eliminate the reinforcing material of the bracket mounting portion or at least reduce the amount of the reinforcing material used. There is an advantage that the weight and the manufacturing cost can be reduced greatly.

Next, in the second embodiment of the present invention shown in FIG. 3, the lower flange 16fl of the bracket 16 is attached to the rivet (or bolt) 20.
It differs from the first embodiment only in that it is fastened to the lower flange 12fl of the side rail 12 by l, and other configurations are substantially the same. Also in this embodiment, a gap 30 opened toward the inside of the vehicle body is provided on the contact surface between the lower flange 16fl of the bracket 16 and the lower flange 12fl of the side rail 12, thereby substantially the same as the first embodiment. It is clear that the above effect can be obtained.

It should be noted that the present invention is not limited to the engine supporting bracket 16 illustrated in each of the above embodiments, but is widely applied to a configuration in which a bracket for supporting a heavy object other than the engine is attached to the side rail 12 of the chassis frame 10. It is possible.

(Effect of the Invention) As described above, the heavy object support structure in the chassis frame according to the present invention has a groove-shaped cross section, and a support table for mounting a heavy object such as an engine is fixed to the web portion thereof. When the upper and lower flanges of the bracket are attached to the side rails whose cross-sectional shape of the chassis frame is groove type by rivets or bolts, respectively, the contact surface between the lower flange of the bracket and the lower flange of the side rail is The present invention is characterized in that a gap opened toward the inside of the vehicle body is provided, and the effect is that durability and reliability of the chassis frame are improved, and at the same time weight reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a side view of a main part of the chassis frame as seen from the inside of the vehicle body to the outside of the vehicle body in the first embodiment of the present invention, and FIG. 2 is an enlarged front view of the chassis frame seen from the direction of arrow A in FIG. 3 is an enlarged front view similar to FIG. 2 showing a second embodiment of the present invention, FIG.
The figure is an enlarged front view similar to FIG. 2 showing a conventional chassis frame. 10 …… chassis frame, 12 …… side rail, 14 …… engine, 16 …… bracket, 18 …… support stand, 30 …… gap.

Claims (1)

[Scope of utility model registration request] 1. An upper and lower flange of a bracket having a groove-shaped cross section, and a support base for mounting a heavy object such as an engine fixed to the web portion thereof, and a chassis frame having a groove-shaped cross section. A chassis which is attached to each of the side rails by rivets or bolts, and a clearance opened toward the inside of the vehicle body is provided at the contact surface between the lower flange of the bracket and the lower flange of the side rail. Heavy object support structure in frame