JP3695282B2 - Fastening structure between a cylindrical frame and a cab mount for a cab over type freight vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fastening structure between a coconut frame and a cap mount of a cab-over type freight vehicle that suppresses deformation of the cab against a frontal collision and rear-end collision of the vehicle and secures a occupant's living space.
[0002]
[Prior art]
In a cab-over type freight vehicle with a cab (cab) mounted on the front of the palm frame and the driver's seat positioned in front of the internal combustion engine, the front end of the palm frame during a frontal collision with the barrier By effectively striking against the barrier and deforming it, the collision energy is absorbed, the living space of the cab is secured, and the safety of the occupant is maintained.
[0003]
In a small cab-over type freight vehicle, various accessories are mounted in the narrow space of the palm frame, so the width of the palm frame is curved so that it widens from the front to the rear, and the wide part of the palm frame The internal combustion engine is supported by In the above-described small cap-over type freight vehicle, in order to secure the living space of the cap at the time of a frontal collision with the barrier, the front half of the side frame of the shim frame has a closed cross-sectional structure. Deformation is suppressed and safety is ensured. However, when the carry-over type freight vehicle collides with the freight vehicle ahead, the driver of the rear-end collision vehicle may be injured.
[0004]
As shown in FIGS. 4 to 6, the carry-over type freight vehicle has a pair of lateral members joined to a pair of left and right side frames 7 to form a palm frame 20, slightly rearward from the front ends of the pair of left and right side frames 7. The internal combustion engine 10 is supported by the portion, and the front, rear, left and right corners of the cap 31 are supported on the side frame 7 so that the driver's seating position is on the upper side of the internal combustion engine 10. The front wheel 26 is supported by the palm frame 20 so as to be positioned approximately at the center of the cap 31 in the front-rear direction. As shown in FIG. 6, in the conventional coconut frame 20, a reinforcing member 29 having a closed cross section is coupled to the front end of the side frame 7 having a U-shaped cross section. The transverse member 2 is joined. The front end floor portion of the cap 31 is supported by the tilt shaft on the cap mount 22 of the support plate 21 extending upward from the front end portion of the side frame 7.
[0005]
As shown in FIG. 7, in a conventional carryover type freight vehicle, a cab mount 22 is formed on the upper end of a support plate 21 which is placed on the upper surface of the front end portion of the side frame 7 having a rectangular cross section and has a substantially U-shaped horizontal cross section. Since the extension piece 21c extending downward along the outer surface of the side frame 7 from the lower part of the support plate 21 is merely coupled to the side frame 7 by the bolts 34 and 35, the cap 31 collides with the preceding vehicle. When the impact load is received, the bolts 34 and 35 of the support plate 21 are broken and the support plate 21 moves rearward. Since the side frame 7 is hardly deformed, only the cap 31 is greatly compressed and deformed, and the living space may be narrowed.
[0006]
When the vehicle collides front with a flat barrier 30 as shown in FIG. 4, the front bumper hits the barrier 30, the collision energy is supported by the pair of left and right side frames 7, and deformation of the cap 31 is minimized. However, as shown in FIG. 5, when the vehicle collides with the preceding vehicle, if there is a height difference between the palm frame 20 of the preceding vehicle and the palm frame 20 of the trailing vehicle, the cap 31 moves to the loading platform 32 of the preceding vehicle. It collides directly with and collapses. That is, as shown in FIG. 7, the load applied to the rear-end collision vehicle acts on the cap 31 and the cap mount 22 that supports the front end floor portion of the cap 31, and the cap mount 22 is separated from the front end of the side frame 7 and moves rearward. , The front wall of the cap 31 is retreated greatly. Therefore, if the side frame 7 is reinforced as a closed cross-section structure considering only the frontal collision, the side of the collision load acting on the cap 31 at the time of rear-end collision and the cap mount 22 supporting the cap 31 on the side frame 7 can be reduced. In order for the strength of the frame 7 to be too strong and the side frame 7 to bend upward or downward effectively, the coupling strength between the cab mount 22 and the side frame 7 must be made quite strong.
[0007]
When the side frame 7 has an open cross-sectional structure and the coupling strength between the cab mount 22 and the side frame 7 is strengthened, the side frame 7 can be bent in the vertical direction during the rear-end collision of the vehicle. When the side frame 7 is curved so that the width of the rear portion (internal combustion engine mounting portion) of the palm frame 20 becomes wide at the time of a collision, the bending portion tends to bend in the left-right direction. It may be difficult to secure a living space. 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 in the layout of the vehicle is reduced, and the advantages of the small-sized carryover type freight vehicle are Damaged.
[0008]
In the cover-over type freight vehicle disclosed in Japanese Patent Laid-Open No. 11-171054, the support plate of the cap mount is supported on the side frame by a single high-strength main bolt, and a plurality of low-strength auxiliary members arranged around the main bolt. Reinforced with bolts. When the cap receives a frontal collision load, the auxiliary bolt that connects the support plate to the side frame breaks, and the support plate tilts backward about the main bolt to absorb the collision energy. Even in the above-described carry-over type freight vehicle, the side frame is not deformed so much that the absorbed collision energy is not sufficient.
[0009]
[Problems to be solved by the invention]
In view of the above-mentioned problems, the object of the present invention is to effectively transmit an input to the front end of the palm frame or the front of the cap to the palm frame in both cases of a frontal collision and a rear-end collision of the vehicle. It is an object of the present invention to provide a fastening structure between a shim frame and a cap mount of a cap-over type freight vehicle that absorbs collision energy and secures a living space of the cap.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has a configuration in which a first lateral member is coupled to at least the front end portions of a pair of left and right side frames to form a palm frame, and is supported on the upper surface of the front end portion of the side frame. Front and rear floors of the side frame are overlapped on the outer side surface of the side frame while the front end floor portion of the cap is axially supported on the cap mount arranged through the plate, and the extension piece extending downward from the support plate is superimposed on the outer side surface of the side frame. The extension piece is engaged with a pair of stop plates, and the extension piece is fixed to the side frame with a bolt.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, an inverted triangular extension piece extending downward from the support plate of the mount is overlaid on the outer surface of the side frame, and is coupled by a bolt between a pair of front and rear stop plates coupled to the outer surface of the side frame. That is, the support plate of the cap mount that supports the front end floor portion of the cap with respect to the side frame is held between the side frames by the pair of front and rear stop plates. At the time of rear-end collision of the vehicle, the side frame is bent upward or downward to absorb the collision energy, and the amount of rearward deformation or retreat of the cap is suppressed to ensure the occupant's living space.
[0012]
【Example】
FIG. 1 is a plan view showing a front half portion of a palm 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 by a plurality of horizontal members. In the illustrated embodiment, the first transverse member 2 is firmly coupled to the front end of the side frame 7. The second transverse member 5 is coupled to a portion separated from the transverse member 2 rearward by a predetermined distance, and the front end of the leaf spring 25 that suspends the front wheel 26 (FIG. 3) near both ends of the transverse member 5 is spring-supported. The member 4 is supported on the side frame 7, and the rear end of the leaf spring 25 is supported on the side frame 7 by the spring support member 8. The distance 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 and the internal combustion engine 10 is supported by the engine mount 9 at the portion where the distance between the side frames 7 is wide. The A clutch 12 and a transmission 13 are integrally coupled to the rear portion of the internal combustion engine 10, and the rotation of the output shaft of the transmission 13 is transmitted to the final reduction gear of the rear wheel 27 (see FIG. 5) via a known propulsion shaft. It is done.
[0013]
As shown in FIG. 2, according to the present invention, a closing plate 17 is coupled to the upper and lower edges of the side frame 7 on the front side of the engine mount 9 that supports the internal combustion engine 10 of the side frame 7. Is a closed cross-sectional structure. A reinforcing member 29 having a square cross section is coupled to the front end of each side frame 7, and the end of the lateral member 2 is firmly coupled between the reinforcing members 29. A cab mount 22 having a lateral shaft hole is supported by a support plate 21 protruding upward at the front end portion of the side frame 7, and the front end floor portion of the cab 31 is supported by the tilt mount on the cab mount 22. The rear end floor portion of the cap 31 is locked on an inverted U-shaped ridge spanned over the left and right side frames 7 so as not to be displaced from front to back and from side to side.
[0014]
In the present invention, the extension piece 21c extending downward from the support plate 21 is formed into an inverted triangle whose width in the front-rear direction becomes narrower as it extends downward, while a pair of stop plates 37 coupled to the outer surface of the side frame 7. , 37a are arranged in a V shape, the extension piece 21c is inserted between a pair of front and rear stop plates 37, 37a, and the front edge portion and the rear edge portion of the extension piece 21c are sandwiched between the stop plates 37, 37a. And are fixed by bolts 34 and 35. Therefore, when the vehicle makes a rear-end collision with the frame moving up and down, the cap mount 22 and the support plate 21 are not directly broken against the rear-end collision load of the front vehicle that only the cap 31 directly receives. That is, the stop plates 37 and 37a take charge of the shear stress applied to the bolts 34 and 35 that support the support plate 21. Further, the support plate 21 is supported by the side frame 7 by a pair of front and rear stop plates 37, 37a, and the front end portion of the side frame 7 is bent upward so as to absorb the collision energy of the cap 31. In addition, since the pair of front and rear stop plates 37, 37a are arranged in a V shape extending upward, even if the bolts 34, 35 are broken, the support plate 21 is guided upward by the stop plates 37, 37a and moved upward. The load which crushes the cap 31 backward is relieved. As described above, the rear-end collision energy is absorbed not only by the deformation of the front wall of the cap 31 but also by the deformation of the side frame 7, so that the deformation of the cap 31 is suppressed and a living space for the occupant is secured.
[0015]
If the opening 28 is provided in a portion close to the support plate 21 of the closing plate 17 having the side frame 7 having a closed cross-sectional shape and the strength is weakened, the side frame 7 is connected to the horizontal member 5 and the horizontal member 2 at the time of a rear-end collision of the vehicle. It becomes easy to bend upwards.
[0016]
【The invention's effect】
In the present invention, as described above, the first lateral member is coupled to at least the front end portions of the pair of left and right side frames to form a palm frame, and is arranged on the upper surface of the front end portion of the side frame via a support plate. A front mount floor portion of the cap is axially supported by the installed cap mount, and an extension piece extending downward from the support plate is overlapped on the outer surface of the side frame, and a pair of front and rear stop plates disposed on the outer surface of the side frame. The extension piece is fixed to the side frame with bolts, so that it is possible to prevent breakage of the support plate of the cab mount to the side frame and stop the side frame in both cases of frontal collision and rear-end collision in the same vehicle. Since the support plate is bent along the plate while moving upward, collision energy is efficiently absorbed by deformation of the front wall of the cap and the palm frame, deformation of the cap is suppressed, and a living space for the occupant is secured. The
[Brief description of the drawings]
FIG. 1 is a plan view of a palm frame of a carry-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 cap at the time of 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 the 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 rear-end collision of a conventional vehicle.
[Explanation of symbols]
2: First transverse member 4: Spring support member 5: Second transverse member 6: Radiator 6a: Support member 7: Side frame 8: Spring support member 9: Engine mount 10: Internal combustion engine 17: Closing plate 20: Palm frame 21: Support plate 22: Cab mount 25: Leaf spring 26: Front wheel 27: Rear wheel 28: Opening 29: Reinforcement member 30: Barrier 31: Cap 34, 35: Bolt 37, 37a: Stop plate

Claims (2)

A first horizontal member is coupled to at least the front end portions of the pair of left and right side frames to form a palm frame, and the front end floor of the cap is mounted on a cap mount disposed on the upper surface of the front end portion of the side frame via a support plate. The extension piece extending downward from the support plate is overlapped on the outer side surface of the side frame, and is engaged with a pair of front and rear stop plates disposed on the outer side surface of the side frame. A fastening structure of a cylindrical frame and a cab mount of a cab over type freight vehicle characterized by being fixed to a side frame with bolts. 2. The cover over cargo vehicle freight vehicle according to claim 1, wherein the extension piece has an inverted triangular shape, and the pair of front and rear stop plates are arranged in a V shape so as to engage with front and rear edges of the extension piece. Fastening structure between palm frame and cap mount.

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