JP2001315663A - Fastening structure between chassis frame and cab mount of cab-over-engine truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the survival space of a cab by transmitting input to the front end of a chassis frame or the front face of the cab effectively to the chassis frame in either case of a head-on collision or a rear-end collision of a vehicle, and absorbing collision energy by the deformation of the chassis frame. SOLUTION: A first transverse member 2 is connected to at least the front end parts of a pair of right and left side frames 7 to constitute a chassis frame 20, and a front end floor part of a cab 31 is rotatably shaft supported on a cab mount 22 disposed on the upper face of the front end part of the side frame 7 through a support plate 21. An extension piece 21c extending downward from the support plate 21 is put over the outer side face of the side frame 7, and engaged with a longitudinal pair of stop plates 37, 37a disposed at the outer side face of the side frame 7. The extension piece 21c is then fixed to the side frame 7 by bolts 34, 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening structure between a shiyashi frame and a cap mount of a cap-over type freight vehicle, which suppresses deformation of the cap against frontal collision and rear-end collision of the vehicle and secures a living space for occupants. is there.

[0002]

2. Description of the Related Art In a cap-over type freight vehicle in which a cabin (cab) is mounted on a front portion of a shiyasu frame and a driver's seat is located ahead of an internal combustion engine, when a frontal collision with a barrier occurs, By effectively deforming the front end of the palm frame against the barrier, it absorbs collision energy, secures a living space for the cab, and maintains occupant safety.

[0003] In a small cabin-over type freight vehicle, various accessories are mounted in a narrow space of the shiyashi frame, so that the width of the shiyashi frame is curved so as to expand from the front to the rear, and the width of the shiyashi frame is increased. The internal combustion engine is supported on a wide portion of the internal combustion engine. In the case of a small-sized cap-over type freight vehicle as described above, at the time of a frontal collision with a barrier, in order to secure a living space for the cab, the front half of the side frame of the cypress frame has a closed cross-sectional structure. Deformation is suppressed to ensure safety. However, when a cap-over type freight vehicle collides with a preceding freight vehicle, the driver of the rear-end vehicle may be injured.

[0004] As shown in FIGS. 4 to 6, in a cap-over type freight vehicle, a plurality of horizontal members are joined to a pair of left and right side frames 7 to form a shiyashi frame 20. The internal combustion engine 10 is supported at a position slightly rearward from the vehicle, and the cabin 3 is positioned so that the driver's seating position is located above the internal combustion engine 10.
The four front, rear, left and right corners are supported on the side frame 7. Front wheel 2
6 is supported by the palm frame 20 so as to be located substantially at the center of the cabinet 31 in the front-rear direction. As shown in FIG. 6, in the conventional palm frame 20, a reinforcing member 29 having a closed cross section is connected to a front end of a side frame 7 having a U-shaped cross section, and a first member between a pair of right and left reinforcing members 29 is provided. The lateral members 2 are joined. The floor of the front end of the cap 31 is tiltably supported by a tilt shaft on a cap mount 22 of a support plate 21 extending upward from the front end of the side frame 7.

[0005] As shown in FIG. 7, in a conventional cap-over type freight vehicle, a cap mount is mounted on the upper end of a support plate 21 having a substantially U-shaped horizontal cross section, which is mounted on the upper surface of the front end of a side frame 7 having a rectangular cross section. The extension piece 21c is formed to extend downward from the lower portion of the support plate 21 along the outer surface of the side frame 7.
Are merely connected to the side frame 7 by the bolts 34 and 35. Therefore, when the cap 31 collides with the vehicle ahead and receives a collision load, the bolts 34 and 35 of the support plate 21 are broken and the support plate 2 is broken.
1 moves backward. Since there is almost no deformation of the side frame 7, only the cab 31 is significantly compressed and deformed, and the living space may be narrowed.

When a vehicle collides with a flat barrier 30 as shown in FIG. 4, the front bumper collides with the barrier 30, the collision energy is supported by a pair of left and right side frames 7, and the deformation of the cap 31 is minimized. As shown in FIG. 5, when the vehicle collides with the front vehicle, if there is a difference in height between the front frame of the front vehicle and the rear frame of the rear vehicle, the cap 31 is driven by the front vehicle. Directly collides with the carrier 32 and is crushed. That is, as shown in FIG. 7, the load applied to the rear-end collision vehicle acts on the cab 31 and the cab mount 22 supporting the floor at the front end of the cab 31, and the cab mount 22 separates from the front end of the side frame 7 and moves rearward. , The front wall of the cab 31 is largely retracted. Therefore, if the side frame 7 is strengthened as a closed-section structure only in consideration of the frontal collision,
In order to flex the side frame 7 upward or downward effectively, the strength of the side frame 7 is too strong against the collision load acting on the cab 31 and the cab mount 22 supporting the cab 31 on the side frame 7 at the time of a rear-end collision. In this case, the connection strength between the cap mount 22 and the side frame 7 must be considerably increased.

When the side frame 7 has an open cross-sectional structure and the coupling strength between the cap mount 22 and the side frame 7 is strengthened, the side frame 7 can be bent in the vertical direction at the time of a rear-end collision of the vehicle. When the side frame 7 is curved so that the width of the rear portion (the portion on which the internal combustion engine is mounted) of the palm frame 20 is widened at the time of a frontal collision of the vehicle, lateral bending deformation is likely to occur in the curved portion, It may be difficult to secure a living space for the cab 31. Therefore, it is conceivable to straighten the side frame 7 in the front-rear direction in order to eliminate the lateral curvature of the side frame 7, but the degree of freedom of the layout of the vehicle is reduced, and the advantage of the small-sized, cabin-over-type cargo vehicle is reduced. Will be damaged.

[0008] In the cap-over type cargo vehicle disclosed in Japanese Patent Application Laid-Open No. H11-171054, the support plate of the cap mount is supported by the side frame by a single high-strength main bolt, and the weak strength disposed around the main bolt is low. Reinforced by multiple auxiliary bolts. When the cab receives a frontal collision load, the auxiliary bolt connecting the support plate to the side frame is broken, and the support plate is tilted rearward about the main bolt to absorb the collision energy. Even in the above-mentioned cap-over type freight vehicle, the collision energy absorbed is not sufficient because the side frame does not deform much.

[0009]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to effectively apply an input to the front end of the shiyasu frame or the front of the cab to the shiyashi frame in both a frontal collision and a rear-end collision of the vehicle. SUMMARY OF THE INVENTION It is an object of the present invention to provide a fastening structure between a shiyashi frame of a cap-over type freight vehicle and a cap mount in which collision energy is absorbed by deformation of a shiyasu frame to secure a living space for the cab.

[0010]

In order to solve the above-mentioned problems, according to the present invention, a first horizontal member is connected to at least a front end of a pair of left and right side frames to form a shiyashi frame. A front end floor portion of the cab is supported by a cab mount disposed on a top surface of a front end portion of the side frame via a support plate, and an extension piece extending downward from the support plate is overlapped with an outer surface of the side frame, and a side frame is provided. And a pair of front and rear stop plates disposed on the outer side surface of each of the first and second stop members, and the extension pieces are fixed to the side frames by bolts.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, an inverted triangular extension piece extending downward from a support plate of a cap mount is superimposed on the outer surface of a side frame, and a bolt is provided between a pair of front and rear stop plates joined to the outer surface of the side frame. Join. In other words, a support plate of a cap mount for supporting the front end floor portion of the cabinet with respect to the side frame is sandwiched between the pair of front and rear stop plates. At the time of a rear-end collision of the vehicle, the side frames are bent upward or downward to absorb the collision energy, suppress the rearward deformation or retreat of the cab, and secure a living space for the occupants.

[0012]

FIG. 1 is a plan view showing the first half of a shiyashi frame of a carryover type freight vehicle according to the present invention. The palm frame 20 is configured by connecting a pair of left and right side frames 7 having a U-shaped cross section with a plurality of lateral members. In the embodiment shown, the first transverse member 2 is firmly connected to the front end of the side frame 7. A second horizontal member 5 is coupled to a portion separated by a predetermined distance rearward from the horizontal member 2, and a front end of a leaf spring 25 for suspending a front wheel 26 (FIG. 3) near both ends of the horizontal member 5 is supported by a spring. The rear end of the leaf spring 25 is supported by the side frame 7 by the spring support member 8. The space between the pair of left and right side frames 7 is widened behind the horizontal member 5, and the radiator 6 is supported by the support member 6 a at the portion where the space between the side frames 7 is wide, and the internal combustion engine 10 is supported by the engine mount 9. You. A clutch 12 and a transmission 13 are integrally connected to a rear portion of the internal combustion engine 10, and rotation of an output shaft of the transmission 13 is transmitted to a final reduction gear of a rear wheel 27 (see FIG. 5) via a known propulsion shaft. Can be

According to the present invention, as shown in FIG.
A closing plate 17 is connected to the upper and lower edges of the side frame 7 at a portion forward of the engine mount 9 supporting the internal combustion engine 10 to form the side frame 7 with a closed sectional structure. A reinforcing member 29 having a rectangular cross section is connected to the front end of each side frame 7, and the end of the horizontal member 2 is firmly connected between the reinforcing members 29. At the front end of the side frame 7, a cap mount 22 having a horizontal shaft hole is supported by a support plate 21 protruding upward, and the front end floor portion of the cap 31 is supported by the cap mount 22 by a tilt shaft. The rear end floor portion of the cap 31 is locked on an inverted U-shaped turret extending over the left and right side frames 7 so as not to be shifted from front to back and left and right.

In the present invention, the extension piece 21c extending downward from the support plate 21 is formed as an inverted triangle whose width in the front-rear direction becomes narrower as it goes downward, while a pair of extension pieces 21c are connected to the outer surface of the side frame 7. The stop plates 37, 37a are arranged in a V-shape, and the extension piece 21c is inserted between a pair of front and rear stop plates 37, 37a, and the front edge and the rear edge of the extension piece 21c are the stop plates 37, 37a. It is sandwiched between and fixed by bolts 34 and 35. Accordingly, when the vehicle has a rear-end collision with the frame passing up and down, the cap mount 22 and the support plate 21 are not directly broken by the rear-end collision load of the front vehicle directly received only by the cap 31. That is, the bolts 34 for supporting the support plate 21,
This is because the stop plates 37 and 37a bear the shear stress applied to the block 35. Further, the support plate 21 includes a pair of front and rear stop plates 37,
The front end portion of the side frame 7 is supported by the side frame 7 so as to be curved upward to absorb the rear-end collision energy of the cab 31. Also, since the pair of front and rear stop plates 37, 37a are arranged in a V-shape that spreads upward, even if the bolts 34, 35 are broken, the support plate 21 is guided upward by the stop plates 37, 37a and moves upward. The load which crushes the cab 31 backward is alleviated. As mentioned above, the rear-end collision energy is
Is absorbed not only by the deformation of the front wall but also by the deformation of the side frame 7, so that the deformation of the cab 31 is suppressed, and the occupant's living space is secured.

If the strength of the side frame 7 is reduced by providing an opening 28 in a portion near the support plate 21 of the closing plate 17 having a closed cross-sectional shape, the side frame 7 is connected to the horizontal member 5 and the horizontal member at the time of a rear-end collision of the vehicle. 2 tends to be curved upward.

[0016]

As described above, according to the present invention, the first horizontal member is connected to at least the front end of the pair of left and right side frames to form a shishi frame, and the upper surface of the front end of the side frame is supported. A front end floor portion of the cap is pivotally supported on a cap mount disposed via a plate, and an extension piece extending downward from the support plate is superimposed on the outer surface of the side frame, and the front and rear 1 disposed on the outer surface of the side frame. By engaging the pair of stop plates and fixing the extension pieces to the side frames with bolts, in both cases of a frontal collision and a rear-end collision in the same vehicle, the breakage of the support plate of the cap mount with respect to the side frames is prevented, In addition, since the support plate is bent while moving upward along the stop plate of the side frame, the collision energy is efficiently absorbed by the deformation of the front wall of the cab and the shiyasu frame, the deformation of the cab is suppressed, and the occupant's Living space is secured.

[Brief description of the drawings]

FIG. 1 is a plan view of a shiyashi frame of a cap-over type freight vehicle equipped with a collision safety device according to the present invention.

FIG. 2 is a perspective view showing a main part of the collision safety device.

FIG. 3 is a side view showing a deformed state of the cab at the time of a rear-end collision of the vehicle.

FIG. 4 is a side view showing a state immediately before a frontal collision of the vehicle.

FIG. 5 is a side view showing a state immediately before a rear-end collision of the vehicle.

FIG. 6 is a perspective view showing a cap mount portion of a side frame of a conventional vehicle.

FIG. 7 is a side view showing a deformed state of a cap at the time of a rear-end collision of a conventional vehicle.

[Explanation of symbols]

2: First horizontal member 4: Spring support member 5: Second horizontal member 6: Radiator 6a: Support member 7: Side frame 8:
Spring support member 9: Engine mount 10: Internal combustion engine 17: Closure plate 20: Shiyashi frame 21: Support plate
22: Cab mount 25: Leaf spring 26: Front wheel 2
7: Rear wheel 28: Opening 29: Reinforcing member 30: Barrier (barrier) 31: Cab 34, 35: Bolt 37, 37a: Stop plate

Claims (2)

[Claims] 1. A cap mount in which a first horizontal member is connected to at least a front end of a pair of left and right side frames to form a sashimi frame, and is disposed on a top surface of the front end of the side frame via a support plate. The shaft supports the floor at the front end of the cab, the extension piece extending downward from the support plate is overlapped on the outer surface of the side frame, and engages with a pair of front and rear stop plates disposed on the outer surface of the side frame. And a fastening structure between a shiyashi frame and a cap mount of a cap-over type freight vehicle, wherein the extension pieces are fixed to side frames by bolts. 2. The extension piece has an inverted triangular shape.
The pair of stop plates are V-shaped so as to engage with the front and rear edges of the extension piece.
The fastening structure between a shiyashi frame and a cap mount of the cap-over type freight vehicle according to claim 1, which is arranged in a character shape.