JP4383787B2 - Cab mounting structure for cab-over vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for improving the ride comfort of a cab in a cab-over vehicle in which a cab is elastically supported on a vehicle body by a spring.
[0002]
[Prior art]
Some cab-over vehicles are provided with a spring between the cab and the vehicle body as disclosed in Japanese Utility Model Laid-Open No. 6-29986 (Patent Document 1).
[0003]
As shown in FIGS. 5 and 6, a front cross member 2 extending in the left-right direction of the vehicle is provided at the lower portion of the front end of the cab 1 of such a cab-over vehicle. Further, a rear cross member extending in the left-right direction of the vehicle is provided at the lower rear end of the cab 1. A pair of left and right side members 3 extending in the vehicle front-rear direction are provided between the front cross member 2 and the rear cross member. A part of the front cross member 2 extends downward, and the front end of the side member 3 is connected to the extended portion.
[0004]
A cab mount bracket 4 extending along the side member 3 is provided below the front portion of the side member 3. The cab mount bracket 4 has a rear end lower portion fixed to the vehicle body so as to be swingable, while a front end extends forward of the vehicle and is connected to the rear surface of the front cross member 2 and is also connected to the lower surface of the side member 3. .
[0005]
A pair of left and right front springs 5 are provided below the side member 3 and between the cab mount bracket 4 and the vehicle body. A spring is provided to absorb vibration during running and improve the riding comfort of the cab 1.
[0006]
[Patent Document 1]
Japanese Utility Model Publication No. Hei 6-29986 [0007]
[Problems to be solved by the invention]
In the cab-over vehicle having such a configuration, the ride comfort of the cab 1 can be further improved by bringing the front spring 5 close to the center of gravity of the cab 1 in the vertical direction.
[0008]
However, the front spring 5 is provided between the cab mount bracket 4 connected to the lower surface of the side member 3 and the vehicle body, and since there is the side member 3 above the cab mount bracket 4, it cannot be moved upward as it is. . Therefore, when the side member 3 is moved upward together with the front spring 5, the space in the cab 1 is reduced in the vertical direction.
[0009]
In order to bring the front spring 5 close to the center of gravity of the cab 1 in the vertical direction, in addition to moving the front spring 5 upward as it is, the front spring 5 is moved in front of the cab 1 and arranged upward. There is a way.
[0010]
However, if the front spring 5 is moved and arranged in front of the cab 1 in this way, the overall length of the vehicle increases. Therefore, in a country where the total length of a vehicle traveling on a public road is regulated by law, such a vehicle has to shorten the longitudinal dimension of the cab 1 or the loading platform in order to be able to travel on the public road. The space in the front-rear direction is reduced or the loading capacity of the loading platform is reduced.
[0011]
Therefore, in view of the conventional problems as described above, the present invention brings the front spring close to the center of gravity of the cab in the vertical direction without reducing the space in the cab and without increasing the total length of the vehicle. An object of the present invention is to provide a cab mounting structure for a cab-over vehicle that improves ride comfort.
[0012]
[Means for Solving the Problems]
For this reason, the invention according to claim 1 is a front cross member extending in the vehicle left-right direction at the lower front end of the cab, and fixed to the lower surface of the cab while extending in the vehicle front-rear direction, and the front end is connected to the rear surface of the front cross member In addition, as the vertical dimension of the front portion is reduced toward the front of the vehicle, the side member having the inclined portion on the lower surface of the front portion and the rear end are inclined so as to incline upward toward the front of the vehicle. The front cross member is fixed to the vehicle body in a swingable manner, and is connected to the side member at the rear end of the inclined portion, and is separated from the side member toward the front of the vehicle from the rear end of the inclined portion of the side member. and extending beauty, Ruki catcher blanking mount bracket connected to the front of the front cross member extending upwardly therefrom at the front under Katama of pre Kiki Is provided between the blanking mounting bracket and the vehicle body, and an elastic member elastically supporting the cab on the vehicle body, it is composed cab mounting structure of cab-over vehicle including take, the carburetor mount bracket, the front face of the front cross member And a connecting portion with respect to the upper position of the elastic member in a space between the inclined portion rear end of the side member and above the inclined portion rear end of the side member, at least in part on the space above the inclined portion rear end Osama characterized Rukoto.
[0013]
According to such a configuration, the front portion of the side member is provided with the inclined portion whose lower surface is inclined upward toward the front of the vehicle, and is between the front surface of the front cross member and the rear end of the inclined portion of the side member. The connecting portion to the upper position of the elastic member of the cab mount bracket is provided in a space above the rear end of the inclined portion, and is elastic so that at least a part thereof fits in the space above the rear end of the inclined portion. Since the member is provided, the elastic member is disposed close to the center of gravity of the cab in the vertical direction without disposing the side member upward and without disposing the elastic member in front of the front cross member. Furthermore, since the cab mount bracket connected to the side member behind the inclined portion is also connected to the front surface of the front cross member, the front cross member and the side member are also connected via the cab mount bracket.
[0014]
The invention according to claim 2 is characterized in that a front end upper portion of the cab mount bracket is widened in the left-right direction of the vehicle and connected to the front surface of the front cross member.
[0015]
According to such a configuration, the front end upper portion of the cab mount bracket is spread in the left-right direction of the vehicle and connected to the front surface of the front cross member, so that the front cross member and the cab mount bracket are firmly connected.
[0016]
The invention according to claim 3 is characterized in that the elastic member is arranged at substantially the same position as the front surface of the front cross member in the vehicle longitudinal direction.
According to such a configuration, the elastic member is disposed at substantially the same position as the front surface of the front cross member in the vehicle front-rear direction, so that the elastic member is disposed above the front cross member without protruding forward. .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, a front cross member 21 and a rear cross member 22 extending in the left-right direction of the vehicle are respectively provided at a front lower portion and a rear lower portion of the cab 20 of the cab-over vehicle. Between the front cross member 21 and the rear cross member 22, a pair of left and right side members 23 that support the lower surface of the floor panel forming the floor surface of the cab 20 are provided extending in the vehicle front-rear direction. The front end of the side member 23 is connected to the rear surface of the front cross member 21, and the rear end of the side member 23 is connected to the front surface of the rear cross member 22.
[0018]
Below the connecting portion between the front cross member 21 and the side member 23 and below the connecting portion between the rear cross member 22 and the side member 23 are a front spring 24a (elastic member) such as an air spring, a coil spring or rubber, and a rear member. Side springs 24b are respectively provided.
[0019]
As shown in FIG. 3, an inclined portion 23 a having a predetermined length that is inclined upward toward the front is provided on the lower surface of the front portion of the side member 23.
A cab mount bracket 25 that extends in the vehicle front-rear direction while sandwiching the side member 23 from the left and right is provided below the front portion of the side member 23 as shown in FIG. The cab mount bracket 25 is fixed to the vehicle body 26 so that the lower end of the rear end of the cab mount bracket 25 is swingable, while the front end 25a extends forward from the front of the front cross member 21 to the front of the vehicle. The upper part is fastened to the front surface of the front cross member 21 by bolts 28. Further, the cab mount bracket 25 is fastened to the lower surface of the side member 23 by bolts 27 behind the inclined portion 23a.
[0020]
A front spring 24a is provided between the cab mount bracket 25 and the vehicle body 26 so as to fit in the vehicle longitudinal direction and between the front surface of the front cross member 21 and the rear end of the inclined portion 23a of the side member 23. ing.
[0021]
Thus, the lower surface of the front portion of the side member 23 is inclined upward toward the front, so that the front spring 24a can be disposed upward without moving the side member 23 upward.
[0022]
Accordingly, the front spring 24a can be moved closer to the center of gravity of the cab 20 in the vertical direction without reducing the space in the cab 20 and without disposing the front spring 24a in front of the front cross member 21. The riding comfort of 20 can be improved.
[0023]
In particular, the front spring 24a can be disposed further upward by disposing the front spring 24a at substantially the same position as the front surface of the front cross member 21 in the vehicle longitudinal direction. Thereby, the front side spring 24a can be brought closer to the center of gravity of the cab 20 in the vertical direction, and the riding comfort of the cab 20 can be further improved.
[0024]
The cab mount bracket 25 is fastened to the side member 23 behind the inclined portion 23a, and the upper portion of the front end 25a is fastened to the front surface of the front cross member 21, so that the front cross member 21 and the side member 23 It functions as a reinforcing member that reinforces the connecting portion. As a result, even if the area of the connecting portion between the front cross member 21 and the side member 23 decreases due to the lower surface of the front portion of the side member 23 being inclined upwards toward the front, the front cross member 21 and the side member 23 are reduced. The strength of the connecting portion can be ensured.
[0025]
Moreover, since the lower surface of the front part of the side member 23 is inclined upwards toward the front, in order to connect the front cross member 21 and the side member 23, the downward extension amount of the front cross member 21 is reduced. Can be reduced. Thereby, the vertical dimension of the front cross member 21 can be reduced, and the manufacturing cost of the front cross member 21 can be reduced.
[0026]
Further, as shown in FIG. 4, the cab mount bracket 25 is fastened to the front cross member 21 by a plurality of bolts 28 that are spaced apart in the vehicle left-right direction with the upper portion of the front end 25 a extending in the vehicle left-right direction. Yes. Thereby, the front cross member 21 and the cab mount bracket 25 can be firmly connected, and the strength of the connecting portion between the front cross member 21 and the cab mount bracket 25 is ensured.
[0027]
【The invention's effect】
As described above, according to the first aspect of the present invention, the riding comfort of the cab can be improved without reducing the space in the cab and without increasing the overall length of the vehicle.
[0028]
Furthermore, since the front cross member and the side member are not only directly connected but also connected via a cab mount bracket, the front cross member is inclined when the front lower surface of the side member is inclined upward toward the front. Even if the area of the connecting portion between the member and the side member decreases, the strength of the connecting portion between the front cross member and the side member can be ensured.
[0029]
According to the second aspect of the present invention, the front cross member and the cab mount bracket are firmly connected, so that the strength of the connecting portion can be ensured. According to the third aspect of the present invention, the elastic member can be arranged upward without protruding forward from the front cross member, so that the elastic member is brought closer to the center of gravity of the cab in the vertical direction. It is possible to improve the riding comfort of the cab.
[Brief description of the drawings]
FIG. 1 is a bottom view of a cab according to an embodiment of the present invention. FIG. 2 is a side view of the cab. FIG. 3 is a side view of the cab mounting structure, and FIG. Fig. 4 is a perspective view showing the same cab mounting structure. Fig. 5 is a side view showing the cab mounting structure in the prior art. Fig. 6 is a perspective view showing the same.
20 Cab 21 Front cross member 23 Side member 23a Inclined portion 24a Front spring 25 Cab mount bracket 25a Front end 26 Car body

Claims (3)

A front cross member extending in the left-right direction of the vehicle at the lower front end of the cab,
The vehicle is fixed to the lower surface of the cab while extending in the vehicle front-rear direction, the front end is connected to the rear surface of the front cross member, and the vertical dimension of the front portion is reduced toward the vehicle front, thereby moving toward the vehicle front. A side member having an inclined part on the lower surface of the front part so as to incline upward;
A rear end is swingably fixed to the vehicle body, and is connected to the side member at the rear of the inclined portion, and is separated from the side member from the rear end of the inclined portion of the side member toward the front of the vehicle. extending beauty in front under Katama crossmembers, and Ruki catcher Bed mount bracket connected to the front of the front cross member extending therefrom upward,
Provided between the front Symbol cab mount bracket and the vehicle body, and an elastic member elastically supporting the cab on the vehicle body,
Comprising
The cab mount bracket is located between the front surface of the front cross member and the rear end of the inclined portion of the side member, and in a space above the rear end of the inclined portion of the side member with respect to the upper position of the elastic member. Having a connection,
The elastic member, cab mounting structure of at least a portion of that Osama cab-over vehicle in the space above the inclined rear end.   2. The cab mounting structure for a cab-over vehicle according to claim 1, wherein a front end upper portion of the cab mount bracket is widened in a vehicle left-right direction and connected to a front surface of the front cross member.   3. The cab mounting structure for a cab-over vehicle according to claim 1, wherein the elastic member is disposed at substantially the same position as the front surface of the front cross member in the vehicle front-rear direction.

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