JP4088825B2 - Vehicle suspension system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle suspension device that suspends a front portion of a chassis frame of a vehicle on a front axle by a leaf spring.
[0002]
[Prior art]
Conventionally, a vehicle is provided with a front axle and a rear axle, and a chassis frame is suspended on these axles by a suspension device. As a suspension device, one using a pair of leaf springs is known. The axles are stacked so as to be orthogonal to a pair of leaf springs arranged in parallel to each other, and the axles are placed at the center of each pair of leaf springs. Both sides can be installed. Here, as shown in FIG. 5, both ends of the pair of leaf springs 1, 1 are attached to the pair of side members 3 a, 3 a in the chassis frame 3 via brackets 2, 2, respectively. On the other hand, a steering device is provided on the front axle on which the front portion of the chassis frame 3 is suspended.
[0003]
Although not shown, tires and wheels are mounted on both sides of the front axle, and straight travel is maintained by the ground contact between the tire and the road surface. The brackets 2 and 2 that support both end portions of the leaf springs 1 and 1 to which the front axle is attached may be greatly tilted in the vehicle width direction with respect to the road surface depending on the degree of curve traveling and the like. When the line connecting the centers of the left and right side members 3a, 3a in FIG. 5 is the XX axis, and the attachment surface of the shackles 4, 4 as the attachment portions of the leaf springs 1, 1 is the YY axis, the attachment of both While the angle is θ in normal running, it changes to θ ′ in FIG. 6 when tilted. As a result, the chassis frame 3 is twisted, and self-excited vibration is generated by the restoring force of the chassis frame 3. This self-excited vibration has a problem of causing a so-called wobble phenomenon in which the vehicle body is vibrated and the steering wheel constituting the steering device vibrates violently. In particular, since the rear ends of the leaf springs 1 and 1 are attached to the rear brackets 2 and 2 via the shackles 4 and 4, the chassis including the rear brackets 2 and 2 supporting the shackles 4 and 4 and the side members 3a and 3a. If the overall rigidity of the frame 3 is insufficient, the wobble phenomenon cannot be effectively prevented.
[0004]
In order to solve this problem, conventionally, the thickness of the side members 3a and 3a and the cross member 3b constituting the chassis frame 3 is increased to increase the rigidity of the chassis frame 3 itself, and a heavy engine is supported. The rigidity of the engine support is enhanced to increase at least the rigidity around the engine (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-8-282531 [0006]
[Problems to be solved by the invention]
However, increasing the plate thickness of the side members 3a, 3a and the cross member 3b to increase the rigidity of the chassis frame 3 itself increases the plate thickness at unnecessary portions, which increases the weight of the vehicle. There is. Further, increasing only the rigidity around the engine has a problem that the balance of rigidity with the front bracket is not balanced and the wobble phenomenon cannot be effectively prevented.
An object of the present invention is to provide a vehicle suspension device that can relatively easily improve the rigidity of attachment of a rear bracket to a chassis frame.
[0007]
[Means for Solving the Problems]
As shown in FIG. 1, the invention according to claim 1 includes a pair of leaf springs 12 and 13 provided along the pair of side members 11a and 11b at the front part of the pair of side members 11a and 11b of the chassis frame 11. A left front bracket 14a, a right front bracket 14b, a left rear bracket 16a, a right rear bracket 16b, and a left rear bracket 16a and a right rear bracket 16b fixed to a pair of side members 11a and 11b for suspension at both ends, It is an improvement of the suspension system for vehicles provided with the support beam 26 erected between the two.
The characteristic configuration is that the left rear bracket 16a and the right rear bracket 16b are respectively a pair of side plates 43, 43 on which the upper ends of the shackles 17 provided at the rear ends of the leaf springs 12, 13 are pivotally supported, and the side members 11a. And a fixed plate 46 welded to the rear ends of the pair of side plates 43, 43 and the connection plate 44, and the support beam 26 is connected to the chassis frame 11. It is made of a U-shaped steel plate having a closed cross-section together with the cross member 11c, and both ends of the support beam 26 are fixed to the fixing plate 46 of the left rear bracket 16a and the fixing plate of the right rear bracket 16b .
[0008]
In the vehicle suspension system according to the first aspect, since the support beam 26 is installed between the left rear bracket 16a and the right rear bracket 16b, the left and right rear brackets 16a and 16b tilt with respect to the chassis frame 11. Doing so is prevented. Therefore, the chassis frame 11 is not twisted, and so-called wobble phenomenon caused by self-excited vibration that tries to restore the twist is prevented.
According to the first aspect of the present invention, since the support beam 26 is simply constructed between the left rear bracket 16a and the right rear bracket 16b which are conventionally provided, the side members 11a and 11b and the cross member 11 It is not necessary to increase the thickness of the member 11c. Therefore, an increase in weight in the vehicle can be suppressed as compared with the conventional case in which the plate thickness of the side members 11a, 11b and the cross member 11c is increased to increase the rigidity. Further, since it is not necessary to increase the plate thickness of the rear brackets 16a and 16b, the rigidity balance with the front brackets 14a and 14b can be balanced.
[0009]
Since the left rear bracket 16a and the right rear bracket 16b each have a fixing plate 46, the support beam 26 can be installed by a relatively simple operation of fixing the end of the support beam 26 to the fixing plate 46. it can.
[0010]
Further, since the support beam 26 is U-shaped , the support beam 26 formed in a U-shape on the left and right rear brackets 16a and 16b fixed so as to protrude downward to the lower portions of the side members 11a and 11b. Both sides overlap from the back. The support beam 26 forms a closed section with the cross member 11c, so that the closed section can be prevented from collapsing. The support beam 26 formed in the U-shape allows the left and right rear brackets 16a, 16b to be Tilt can be effectively prevented.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, a first embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the front portions of the pair of side members 11a and 11b extending in the vehicle traveling direction of the chassis frame 11 in the vehicle are a pair of leaf springs 12 provided along the side members 11a and 11b. , 13. The left and right front brackets 14a and 14b and the left and right rear brackets 16a and 16b are fixed to the front portions of the pair of side members 11a and 11b at predetermined intervals in the front-rear direction. The front ends of the leaf springs 12 and 13 are pivotally attached to the left and right front brackets 14 a and 14 b via the first pin 21, and the rear ends are connected to the second pins 22 and 22, the shackles 17 and 17 and the third pin 23. It is pivotally attached to the left and left rear brackets 16a and 16b.
[0012]
A front axle 18 is provided below the pair of leaf springs 12 and 13 so as to extend in the vehicle width direction. A pair of spring seats 18b and 18c are provided on the surface of the axle 18 facing the pair of leaf springs 12 and 13, and the pair of leaf springs 12 and 13 have their central lower surfaces placed on the seats 18b and 18c. The state is fixed by the U bolt 19. Here, although not shown, there is an example in which a stabilizer device is provided between the pair of side members 11 a and 11 b of the chassis frame 11 and the front axle 18.
[0013]
The pair of leaf springs 12 and 13 have the same structure, and the leaf spring 12 provided along the left side member 11a will be described as a representative example. As shown in detail in FIG. And the center has three main leaf springs 12a to 12c slightly curved downward. An eyeball portion 12e is formed at the front ends of the two main leaf springs 12a and 12b. The eyeball portion 12e is pivotally attached to the left front bracket 14a fixed to the left side member 11a of the chassis frame 11 via the first pin 21. The On the other hand, the eyeball portion 12f formed at the rear ends of the two main leaf springs 12a and 12b is pivotally supported by the lower end of the shackle 17 whose upper end is pivotally attached to the left rear bracket 16a fixed to the left side member 11a. . The remaining one main leaf spring 12c is disposed below the two main leaf springs 12a and 12b, and both ends thereof are attached to the two main leaf springs 12a and 12b by clips 24 and 24. The center of the three main leaf springs 13a to 13c is fixed to the upper surface of the front axle 18 by U bolts 19 and 19. The leaf spring 12 configured in this manner is configured so as to attenuate vibrations and the like received by the front axle 18 from the road surface by being bent, and the vibrations and the like are not transmitted to the chassis frame 11.
[0014]
As shown in detail in FIGS. 1 to 4, the characteristic configuration of the present invention is that a support beam 26 is installed between the left rear bracket 16 a and the right rear bracket 16 b. Since the left rear bracket 16a and the right rear bracket 16b have a bilaterally symmetric structure, the left rear bracket 16a will be described as a representative. As shown in detail in FIG. An attachment portion 41 attached to the side member 11a from the side, and a pivot portion 42 that is integrally formed with the attachment portion 41 and pivotally supports the upper end portion of the shackle 17 via a collar 25. The attachment part 41 and the pivotal support part 42 are each formed by sheet-metal processing a steel plate, and the pivotal support part 42 is attached to the attachment part 41 by welding the attachment part 41 and the pivotal support part 42 formed by processing into a predetermined shape. The left rear bracket 16a is made by integration. In this embodiment, one mounting hole 41a is formed in the mounting portion 41, and the bolt 37 (FIG. 2) inserted into the mounting hole 41a is further inserted into an insertion hole (not shown) formed in the side member 11a. The attachment portion 41 is attached to the side member 11a by screwing a nut (not shown).
[0015]
On the other hand, the pivot portion 42 is provided with a collar 25 that pivotally supports the third pin 23, and a pair of side plates 43 that pivotally support the upper end portion of the shackle 17 (FIGS. 1 and 2) via the third pin 23, 43, a connection plate 44 provided in parallel with the collar 25 so as to connect the pair of side plates 43, 43, and a fixed plate welded so as to close the rear ends of the pair of side plates 43, 43 and the connection plate 44 46. The pair of side plates 43, 43 and the connecting plate 44 are integrally formed by bending a steel plate into a substantially U shape by sheet metal working. In this embodiment, the mounting plate 44 has two mounting holes 44a. It is formed. A bolt (not shown) inserted from below into the mounting hole 44a is further inserted into an insertion hole (not shown) formed in the side member 11a and a nut (not shown) is screwed to fix the connecting plate 44 to the lower portion of the side member 11a. The The periphery of the fixing plate 46 is welded to the rear ends of the pair of side plates 43, 43 and the connecting plate 44. In this embodiment, the fixing plate 46 has three attachment holes 46a.
[0016]
As shown in FIG. 4, the support beam 26 is made by sheet-metal processing a steel plate, and is formed in a U-shape that forms a closed section together with the cross member 11 c of the chassis frame 11. At both ends of the support beam 26, through holes (not shown) that are opposed to the mounting holes 46a in the fixing plates 46 of the left rear bracket 16a and the right rear bracket 16b are formed. Then, the bolt 47 (FIG. 4) inserted through the insertion hole (not shown) is further inserted into the mounting holes 46a in the fixing plates 46 of the left and right rear brackets 16b and 16a, and a nut (not shown) is screwed together. The end of the support beam 26 is fixed to the fixed plate 46. In this way, the support beam 26 is installed between the left rear bracket 16a and the right rear bracket 16b.
[0017]
In the vehicle suspension system configured as described above, since the support beam 26 is installed between the left rear bracket 16a and the right rear bracket 16b, the left and right rear brackets 16a and 16b are prevented from tilting. . In particular, in this embodiment, since the support beam 26 is U-shaped, the left and right rear brackets 16a and 16b are fixed to the lower portions of the side members 11a and 11b so as to protrude downward. Further, both side portions of the support beam 26 overlap from the rear, and the tilting of the left and right rear brackets 16a and 16b can be effectively prevented. Therefore, the torsion of the chassis frame 11 due to the tilting of the left and right rear brackets 16a and 16b is avoided, and a so-called wobble phenomenon due to self-excited vibration that attempts to restore the torsion can be prevented.
[0018]
Here, in the present invention, since the support beam 26 is simply constructed between the left rear bracket 16a and the right rear bracket 16b provided conventionally, the side members 11a and 11b and the cross member 11c are provided. There is no need to increase the plate thickness. Therefore, an increase in weight in the vehicle can be suppressed as compared with the conventional case in which the plate thickness of the side members 11a, 11b and the cross member 11c is increased to increase the rigidity. Further, since it is not necessary to increase the plate thickness of the rear brackets 16a and 16b, the rigidity balance with the front brackets 14a and 14b can be balanced.
[0019]
In the above-described embodiment, the plate-like support beam 26 made by processing a steel plate is explained, but the support beam 26 can prevent the left rear bracket 16a and the right rear bracket 16b from tilting. As long as the pipe is bent, it may be a U-shaped support beam, and both sides may be steel plates and the middle of them may be connected by a pipe.
[0020]
In the above-described embodiment, the leaf spring having the three main plate springs 12a to 12c has been described. However, the leaf spring has five, four, or two main plate springs. Alternatively, a leaf spring made of a single plate material may be used. It can also be applied to a front air suspension that combines a leaf spring and an air spring. In particular, in the case of using a leaf spring made of a single plate material, there is concern about a decrease in rigidity in the lateral direction, but in the present invention, the support beam 26 can prevent the left rear bracket 16a and the right rear bracket 16b from tilting. Therefore, it is possible to effectively prevent the so-called collapse phenomenon that the leaf spring is twisted with the tilting of the bracket.
[0021]
【The invention's effect】
As described above, according to the present invention, since the support beam is installed between the left rear bracket and the right rear bracket, the left and right rear brackets are prevented from tilting. Therefore, the chassis frame is prevented from being twisted due to the tilting of the left and right rear brackets, and so-called wobble phenomenon caused by self-excited vibration can be effectively prevented. Here, according to the present invention, it is not necessary to increase the plate thickness of the side member and the cross member. Therefore, an increase in weight in the vehicle can be suppressed as compared with the conventional case in which the plate thickness of the side member and the cross member is increased to increase the rigidity thereof. Further, since it is not necessary to increase the thickness of the rear bracket, the rigidity balance with the front bracket can be balanced.
[0022]
In addition, if a fixing plate is provided on the left rear bracket and the right rear bracket, the support beam can be installed by a relatively simple operation such as fixing the end of the support beam to the fixing plate. Is formed in a U-shape, the left and right rear brackets are overlapped from the rear on both sides of the U-shaped support beam, and the left and right rear brackets are tilted by the U-shaped support beam. Can be effectively prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a suspension device of the present invention. FIG.
FIG. 3 is a perspective view showing a left rear bracket of the apparatus.
4 is a sectional view taken along line BB in FIG.
FIG. 5 is a cross-sectional view corresponding to FIG. 4 showing a conventional suspension device.
6 is a cross-sectional view corresponding to FIG. 5, showing a state in which the conventional rear bracket is tilted.
[Explanation of symbols]
11 Chassis frame 11a, 11b Side member 12, 13 Leaf spring 14a Left front bracket 14b Right front bracket 16a Left rear bracket 16b Right rear bracket 17 Shackle 26 Support beam 43 Side plate 44 Connecting plate 46 Fixing plate

Claims (1)

To suspend a pair of leaf springs (12, 13) provided along the pair of side members (11a, 11b) at the front portions of the pair of side members (11a, 11b) of the chassis frame (11) at both ends. A left front bracket (14a), a right front bracket (14b), a left rear bracket (16a) and a right rear bracket (16b) fixed to the pair of side members (11a, 11b), respectively, and the left rear bracket ( in the vehicle suspension system and a bridged by support beams (26) between 16a) and the right rear bracket (16b),
The left rear bracket (16a) and the right rear bracket (16b) are each a pair of side plates (43, 43 ) on which the upper ends of shackles (17) provided at the rear ends of the leaf springs (12, 13) are pivotally supported . 43), and said side members (connecting plates secured to 11a) connecting the pair of side plates (43, 43) (44), after the pair of side plates (43, 43) and the coupling plate (44) A fixing plate (46) welded to the end ,
The support beam (26) is made of a U-shaped steel plate that forms a closed section together with the cross member (11c) of the chassis frame (11) ,
It said support beam (26) across the fixed plate (46) and the right rear bracket (16b) of the vehicle suspension system, characterized in that fixed to the fixed plate of the left rear bracket (16a) of.

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