JPH09220920A - Rolling prevention mechanism of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly restrain rolling of a car body against vibration of a vehicle. SOLUTION: A first lateral rod 16 is connected to one end part on the side of an axle 11 free to revolve, and a second lateral rod 17 is connected to the other end part free to revolve. Additionally, the other end part of the second lateral rod 17 is connected to one end part of the side of a car body 13 free to revolve. Furthermore, a hydraulic cylinder 18 is supported on the other end part on the side of the axle 11 free to revolve, and a head end of its rod is connected to a connecting point C to which both of the lateral rods 16, 17 are connected free to revolve. Thereafter, the hydraulic cylinder 18 extends and contracts against vibration of a vehicle and a bending angle of both of the lateral rods 16, 17 with each other is regulated, but in this case, the hydraulic cylinder 18 is controlled so that a distance H between the side of the axle 11 and the side of the car body 13 becomes twice as large as a distance X between the side of the axle 11 and the connecting point C, and accordingly. the car body 13 is displaced only in the vertical direction without slipping in the cross direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for preventing rolling of a vehicle body.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 7, a vehicle supports a vehicle body 3 on front and rear axles 1 (only one is shown) via coil springs 2 and 2. Further, the axle 1 side and the vehicle body 3 side are connected by a lateral rod 4 in order to prevent the vehicle body 3 from rolling laterally against vibrations of the vehicle. That is, one end of the lateral rod 4 is rotatably supported by one end on the axle 1 side (the left end in the figure), and the other end of the lateral rod 4 extends obliquely upward and extends above the vehicle body 3 side. The lateral rod 4 is rotatably connected to an end portion (right end portion in the drawing) opposite to the one end portion. As a result, the vehicle body 3 is displaced in the up-down direction while the lateral movement of the vehicle body with respect to the vibration of the vehicle is suppressed by the lateral rod 4.

[0003]

However, observing the movement of the vehicle body in response to the vibration of the vehicle in detail, the contact point D connected to the other end of the lateral rod 4, that is, the vehicle body 3 side.
Because the lateral rod 4 displaces while drawing a turning locus around the contact point E supported on the axle 1 side,
Will be displaced in the vertical direction while slightly shifting laterally. Therefore, in the conventional configuration, although the lateral rod suppresses the rolling motion against the vibration of the vehicle, the lateral motion roll cannot be completely prevented. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle roll prevention mechanism capable of reliably suppressing roll of the vehicle body against vibration of the vehicle.

[0004]

In order to achieve the above object, a rolling prevention mechanism for a vehicle according to the present invention is provided for preventing the rolling of a vehicle body supported on an axle via a spring. This is an anti-sway mechanism that connects the axle and the vehicle body by a connecting mechanism, and the distance between both axle-side and vehicle-side connecting points of this connecting mechanism can be changed. The invention is characterized in that the control means for deforming the connecting mechanism is connected so that the side contact point is displaced substantially only in the vertical direction (the invention of claim 1).

According to the first aspect of the present invention, the connecting mechanism has a first lateral rod whose one end is rotatably connected to the axle, and the other end of the first lateral rod has one end thereof. Is rotatably connected to the vehicle body, and the other end of the second lateral rod is rotatably connected to the vehicle body, and the control means is attached to either the vehicle body side or the axle side. It is also possible to displace the vehicle body side connecting point of the second lateral rod only in the substantially vertical direction by controlling the expansion and contraction amount of the cylinder according to the variation of the height interval between the vehicle body side and the axle side. Good (the invention of claim 2).

Further, according to the second aspect of the present invention, the first and second lateral rods are formed to have the same length, and the connecting contacts between the vehicle body side and the axle side and the connecting contacts between the rods are made of these three. It is arranged so that an isosceles triangle with one connecting point as the apex is formed, and the height interval between the vehicle body side and the axle side is such that the connecting point between both lateral rods and the vehicle body side or the axle side is A configuration may be adopted in which the expansion / contraction amount of the cylinder is controlled so as to be twice the height interval (the invention of claim 3).

[0007]

According to the first aspect of the present invention, when the vehicle body is laterally swayed by the vibration of the vehicle, the control means deforms the connecting mechanism to laterally move the vehicle body side connecting contact. Displace only in the vertical direction without shifting. Therefore, the rolling of the vehicle body against the vibration of the vehicle can be reliably suppressed.

According to the second aspect of the present invention, when the height interval between the vehicle body side and the axle side changes due to the vibration of the vehicle, the cylinder expands and contracts according to the amount of the change, and the lateral rods bend. The angle is adjusted. In this case, the expansion / contraction amount of the cylinder is controlled so that the vehicle body side contact point of the second lateral rod does not laterally shift but is displaced only vertically. Therefore, the rolling of the vehicle body against the vibration of the vehicle can be reliably suppressed.

According to the third aspect of the present invention, both lateral rods have the same length, and further, the height interval between the vehicle body side and the axle side with respect to the vibration of the vehicle is such that the connecting point between the lateral rods and the vehicle body. Side or axle side, the cylinder expands and contracts so as to be twice the height interval, and the bending angle between both lateral rods is adjusted. That is, the vehicle body side contact point of the second lateral rod is adjusted so as to be displaced only up and down without laterally shifting on the vertical axis with respect to the axle side contact point of the first lateral rod. Rolling is suppressed. Therefore, the control of the amount of expansion and contraction of the cylinder is performed so that the height interval between the vehicle body side and the axle side is simply twice the height interval between the connecting contact between both lateral rods and the vehicle body side or the axle side. It's very easy to control because it only needs to be set.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which a vehicle rolling prevention mechanism of the present invention is embodied will be described below with reference to FIGS. Generally, a vehicle has front and rear axles, and a vehicle body is supported on the axles via coil springs. That is, as shown in FIG. 2, coil springs 12, 12 are vertically attached to both left and right ends of an axle 11 (only one of which is shown) arranged in the front and rear of the vehicle.
A frame 14 which is a frame of the vehicle body 13 is supported by 2. Then, the vehicle roll prevention mechanism 15 of the present embodiment includes the axles 11 and the vehicle body 1 arranged in front of and behind the vehicle roll prevention mechanism 15.
And 3 respectively. Since both roll-swing preventing mechanisms 15 have the same configuration, only one of them will be described here.

As shown in FIG. 1, the roll preventing mechanism 15 includes a first lateral rod 16 and a second lateral rod 17 corresponding to the connecting mechanism of the present invention, and a hydraulic cylinder 18 corresponding to control means. It is equipped with. That is,
Axle housing 19 forming the outer shape of the axle 11
In the figure, a bracket 20 is provided so as to project upward at the right end, and one end of the first lateral rod 16 is rotatably connected to the bracket 20. The other end of the first lateral rod 16 extends diagonally upward to the left in the drawing,
One end of the second lateral rod 17 is rotatably connected to the other end. Further, the other end of the second lateral rod 17 extends obliquely upward to the right in the drawing so as to be folded back. On the other hand, a bracket 21 is provided so as to project downward on the right end portion of the frame 14 forming the frame of the vehicle body 13 in the drawing, and the bracket 21 has the second lateral rod 17 mounted thereon.
The other end of the is rotatably connected.

Here, the lengths of the first lateral rod 16 and the second lateral rod 17 are set to be equal to each other, and the vehicle body 13 side of both rods 16 and 17 and the axle 11 are set.
The side rotation center is set to be located on the vertical axis when the center positions of the axle 11 and the vehicle body 13 in the horizontal direction are aligned. Therefore, as shown in FIG. 3, in a natural state (initial state) in which the first lateral rod 16 and the second lateral rod 17 are connected to the vehicle body 13 side and the axle 11 side, respectively, in a natural state (initial state) where they are not vibrated. The contact point C between B and the lateral rods 16 and 17 is arranged so that an isosceles triangle having these three contact points A, B and C as vertices is formed, and the position of the contact point B is the contact point. It will be placed directly above A. Further, from this, the distance H, which is the height interval between the contact points A and B, is inevitably twice the distance X, which is the height interval between the contact points C and the axle 11 side. Will be set. On the contrary, as long as the distance H is held so as to be twice the distance X, the continuous contact B can be located right above the continuous contact A.

A bracket 22 is also projected upward at the left end of the axle housing 19 in the figure, and the rear end of the hydraulic cylinder 18 is rotatably supported here. The tip of the rod 18a of the hydraulic cylinder 18 is rotatably connected to the other end of the first lateral rod 16 together with one end of the second lateral rod 17. That is, at the contact point C, each rod 16, 17, 18
a is rotatable with respect to each other. Accordingly, when the rod 18a of the hydraulic cylinder 18 is expanded / contracted, the first lateral rod 16 can be rotated about the communication contact A,
The bending angle between the lateral rods 16 and 17 is adjusted. The hydraulic cylinder 18 is connected to a hydraulic pump (not shown), and the rod 18a is expanded and contracted to a desired position by controlling the supply / discharge operation from the hydraulic cylinder 18 by the cylinder control means described later. .

Further, a distance detecting sensor 23 is attached downward at the center of the frame 14 in the horizontal direction. Although not shown, the distance detection sensor 23 is provided with a pair of a light projecting element and a light receiving element, and the light projecting element is installed so as to irradiate the axle housing 19 with laser light perpendicularly thereto, and the light receiving element thereof It is installed so that the reflected light from the axle housing 19 with respect to the laser light can be received. When the light receiving element receives the reflected light, a light receiving signal is output to a measuring device (not shown) according to the amount of the received light. Then, by the cylinder control means described below,
The height H between the frame 14 and the axle housing 19 from the received light signal, that is, the height H between the axle 11 side and the vehicle body 13 side (the height between the contact point A and the contact point B). (Equal to the interval) is calculated, and the supply / discharge operation for the hydraulic cylinder 18 is further controlled based on the distance H. The received light signal is continuously output, and by sampling this at a predetermined time in the measuring device,
The change in the distance H can be continuously calculated at every predetermined time. Further, the received light signal is an analog signal whose current value changes according to the amount of received light, but when a laser displacement sensing device is used as the measuring device, the voltage value changes according to the amount of received light.

The cylinder control means will be described with reference to FIG. First, the initial value H0 is substituted for the variable H1 (step 1). The initial value H0 is the coil spring 12
Is a distance dimension between the axle 11 side and the vehicle body 13 side in a natural state (corresponding to a distance H0 indicating a distance between the vehicle body 13 side and the axle 11 side indicated by a two-dot chain line in FIG. 4). ). Then, the distance H, which is the height interval between the axle 11 side and the vehicle body 13 side, is calculated based on the light receiving signal output from the light receiving element (step 2). Then the distance H
And the variable H1 are compared (step 3), and when it is determined that the distance H is larger than the variable H1, that is, the initial value H0 here (when the vehicle body 13 is displaced upward), the hydraulic cylinder 18 is moved. A pressure supply operation is performed on the other hand, and the rod 18a of the hydraulic cylinder 18 extends (step 4). And
In the pressure supply operation for the hydraulic cylinder 18, the distance X, which is the height interval between the axle housing 19 and the tip of the rod 18a, that is, between the axle 11 side and the contact point C, is 1 / H of the distance H.
It is performed until it becomes 2 (step 5). On the other hand, when it is determined that the calculated distance H is smaller than H1 in step 3 (when the vehicle body 13 is displaced downward), the hydraulic cylinder 18 is discharged, and the rod 18a of the hydraulic cylinder 18 is operated. Shrinks (step 7). Then, the exhaust pressure operation is performed until the distance X becomes 1/2 of the distance H (step 8).

After that, the value of the distance H is substituted into the variable H1 (step 6), and the process returns to step 2. That is, the current distance H is stored and then the next light receiving signal is sampled. Then, the distance H is calculated from the next received light signal and the distance H is compared with the variable H0.
Here, since the variable H1 is the distance H calculated based on the light receiving signal sampled one before, step 3
Then, the current distance H is compared with the previous distance H. Therefore, in step 3, it is determined whether the vehicle body 13 is displaced upward or downward, and as long as it is determined that the distance H is larger than the variable H1, that is, the displacement is continued upward. Steps 2, 3, 4, 5,
6 is repeated. Further, as long as the distance H is smaller than the variable H1, that is, the distance H is displaced downward, steps 2, 3, 7,
8 and 6 are repeated.

Next, the operation of the present embodiment will be described.
For example, the vibration generated by traveling on a rough road acts on the vehicle body 13 via the coil spring 12. Then, the vehicle body 13 receives a force in a direction of moving away from or approaching the axle 11 side, but at that time, the vehicle body 13 is displaced along the rotation direction of the second lateral rod 17 around the connecting point C. . Further, in that case, the vehicle body 13 side and the axle 1
When the height interval between the first side and the second side fluctuates, the expansion / contraction amount of the rod 18a of the hydraulic cylinder 18 is controlled by the cylinder control means in accordance with the fluctuation amount, so that both lateral rods 16 and 17 are provided.
The bending angle between them is adjusted.

For example, when the vehicle body 13 is lifted up, the distance H, which is the height interval between the vehicle body 13 side and the axle 11 side, acts in the direction of increasing, so that the cylinder control means causes the hydraulic cylinder to move. The pressure supply operation is performed on 18, and the rod 18a follows the change in the distance H such that the distance X, which is the height interval between the axle 11 side and the contact point C, is 1/2 of the distance H. That is, as shown in FIG. 4, the second lateral rod 17 itself rotates in the direction of the arrow a around the connecting point C, but the first lateral rod 16 itself moves around the connecting point A in the second lateral rod 17. The distance H is always twice the distance X by rotating in the direction of the arrow b in the figure, which is the opposite direction of the rotation direction.
As a result of such a complex movement, the connecting point B is displaced in the direction of arrow c. The fact that the distance H is twice the distance X means that the isosceles triangle is kept held, and the contact point B
Is displaced on the vertical axis connecting the contact point A, and eventually the vehicle body 13
Will only be displaced upward without lateral displacement.

When the vehicle body 13 reaches the maximum point with respect to the force received, the vehicle body 13 is pulled down by the repulsive force of the extended coil spring 12. That is, FIG.
As shown in, the second lateral rod 17 itself has a contact point C.
It rotates in the direction of arrow d in the figure. At this time, the vehicle body 13
Since the distance H, which is the height interval between the side of the axle 11 and the side of the axle 11, acts in the direction of decreasing, the cylinder control means causes the hydraulic cylinder 18 to discharge pressure, and the rod 18a has the distance X and the distance H. The change of the distance H is tracked so that it becomes 1/2 of. That is, the second lateral rod 17
Is rotated in the direction of arrow d, the first lateral rod 1
6 rotates in the direction of the arrow e in the figure, which is the opposite direction to the second lateral rod 17, so that the distance H is always twice the distance X. Therefore, the movement of the contact B is changed from the direction of the arrow d to the direction of the arrow f and moves downward on the vertical axis with respect to the contact A, so that the vehicle body 13 does not shift laterally but only downward. It will be displaced.

Further, when the vehicle body 13 reaches the lowest point with respect to the repulsive force of the coil spring 12, the vehicle body 13 moves upward on the vertical axis with respect to the contact point A in the same manner as described above due to the repulsive force of the coil spring 12 contracted again. The coil spring 12 converges to a position where the coil spring 12 is in a natural state, that is, a state before being subjected to vibration while repeatedly displacing the vertical axis in the vertical direction.

As described above, in this embodiment, when the height interval between the vehicle body 13 side and the axle 11 side fluctuates due to the vibration of the vehicle, the expansion / contraction amount of the hydraulic cylinder 18 is changed according to the fluctuation amount. The bending angle between the lateral rods 16 and 17 is adjusted by the control. In this case, the expansion / contraction amount of the hydraulic cylinder 18 is such that the connecting point B of the second lateral rod 17 on the vehicle body 13 side is displaced only up and down on the vertical axis with respect to the connecting point A of the first lateral rod 16 on the axle 11 side. Since the vehicle body 13 is controlled, the vehicle body 13 does not always laterally shift with respect to the vibration of the vehicle, but is displaced only up and down, so that the rolling of the vehicle body 13 with respect to the vehicle vibration is suppressed.

The positions of the respective contact points A, B, C are arranged so that an isosceles triangle with these three contact points A, B, C as vertices is formed, so that the hydraulic cylinder 18 moves. The amount of expansion and contraction is controlled simply by the vehicle body 13 side and the axle 11
It is only necessary to make the height interval between the lateral rod 16 and the lateral rod 16 and 17 twice the height interval between the contact point C between the lateral rods 16 and 17 and the vehicle body 13 side, so that control is simple. .

The present invention is not limited to the above-described embodiments, but can be modified and implemented as follows, for example, and these embodiments also belong to the technical scope of the present invention. (1) In the above embodiment, both lateral rods 16 and 1
Although the lengths of 7 are set to be equal and the connecting contact B is located directly above the connecting contact A, the structure in which the lengths of both lateral rods are different and the position of the connecting contact B are different. The configuration may not be directly above the contact point A. However, in this case, the control of the hydraulic cylinder does not simply control the amount of expansion and contraction so that the distance H is twice the distance X, so the control of the hydraulic cylinder becomes more complicated than in the above embodiment. However, there is no difference in that it is included in the vehicle roll prevention mechanism of the present invention.

(2) In the above embodiment, the connecting mechanism according to the present invention is constituted by connecting the first lateral rod 16 and the second lateral rod 17 in a bent state. However, the connecting mechanism has a plurality of lateral rods. May be connected in a bent state, or a plurality of lateral rods may be linearly arranged and slidably connected to each other.

(3) In the above embodiment, the bending angle between the lateral rods 16 and 17 is adjusted by rotating the first lateral rod 16 by the hydraulic cylinder 18, but the air cylinder is used. The first lateral rod may be rotated by a servo motor, a rotary motor, or the like.

(4) In the above embodiment, the axle 11
The hydraulic cylinder 18 is controlled based on the change in the height interval between the side of the vehicle body 13 and the side of the vehicle body. However, the change in the bending angle between the lateral rods is measured by an angle sensor or the like, The hydraulic cylinder may be controlled based on the measured value.

(5) In the above-described embodiment, the distance detecting sensor 23 uses laser light, but it may be an electromagnetic type or other distance detecting sensors, and the electromagnetic type is an optical type. Compared to this, it is highly reliable even when it gets dirty with mud splashes. In addition, the present invention can be implemented with various modifications without departing from the scope.

[Brief description of drawings]

FIG. 1 is a front view showing the whole of the present embodiment.

FIG. 2 is a perspective view of the same.

FIG. 3 is a simplified diagram showing the positional relationship of each contact point.

FIG. 4 is a simplified diagram showing a positional relationship between the contact points when the contact points are displaced upward.

FIG. 5 is a simplified diagram showing a positional relationship of each contact when it is displaced downward.

FIG. 6 is a flowchart showing cylinder control means.

FIG. 7 is a front view showing a conventional example.

[Explanation of symbols]

 11 ... Axle 12 ... Coil spring (spring) 13 ... Vehicle body 16 ... First lateral rod (connecting mechanism) 17 ... Second lateral rod (connecting mechanism) 18 ... Hydraulic cylinder (cylinder / control means)

Claims (3)

[Claims] 1. A rolling prevention mechanism for a vehicle for preventing rolling of a vehicle body supported via a spring on an axle, wherein the axle and the vehicle body are connected by a connecting mechanism, and the connecting mechanism is used. The distance between the axle-side and vehicle-body-side connecting contacts of the mechanism is changeable, and the connecting mechanism is deformed so that the vehicle-body-side connecting contact is displaced substantially only in the vertical direction. A rolling prevention mechanism for a vehicle, characterized in that the means are connected. 2. The connecting mechanism according to claim 1, wherein one end of the connecting mechanism is rotatably connected to the axle, and the other end of the first lateral rod is connected to the first lateral rod. One end is rotatably connected, and the other end is a second lateral rod rotatably connected to the vehicle body side, and the control means is one of the vehicle body side and the axle side. A cylinder attached to the vehicle body, and by controlling the expansion / contraction amount of the cylinder according to the variation in the height interval between the vehicle body side and the axle side, the vehicle body side connecting contact of the second lateral rod is moved substantially vertically. A rolling prevention mechanism for a vehicle, which is configured to be displaced only. 3. The apparatus according to claim 2, wherein the first
-The second lateral rods are formed to have the same length, and the connecting points on both the vehicle body side and the axle side and the connecting points between the rods are formed into an isosceles triangle with these three connecting points as vertices. The cylinder is arranged such that the height interval between the vehicle body side and the axle side is twice the height interval between the contact point between the lateral rods and the vehicle body side or the axle side. A rolling prevention mechanism for a vehicle, characterized in that the amount of expansion and contraction of the vehicle is controlled.