JPH09263201A - Rear wheel lift warning device for trailer - Google Patents

Abstract

(57) [Abstract] [Problem] Firstly, a driver in a driver's cab can grasp an abnormal inclination of a loading platform, a rear wheel on one side being lifted from the ground, and the like, and can immediately respond to the operation, thereby causing a fall. Secondly, it proposes a rear wheel lift warning device for the trailer, in which accidents are prevented and, secondly, this is realized simply and easily. A trailing wheel lift warning device (2) for a trailer (1) has a limit switch (1) below a cargo bed (8) of the trailer (1).
The detection means 10 such as 5 is provided, and the detection means 10
Link rod 1 interposed between the rear wheel 9 and the axle 11
The displacements of 2 and 13 are detected. As a result, the cargo bed 8 is greatly tilted when turning, and the rear wheel 9 on one side is about to be lifted from the ground B, or is lifted up and the trailer 1 is lifted.
The warning means 14 such as a buzzer or a lamp in the driver's cab 6 of the tractor 3 is set to operate before the vehicle falls.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear wheel lift warning device for a trailer. That is, the present invention relates to an alarm device for alarming the lifting of rear wheels of a trailer in a vehicle in which a trailer is connected to a tractor by a coupler.

[0002]

2. Description of the Related Art Since a tractor and a trailer are connected only by a coupler, it is not easy to grasp the vertical inclination of a trailer side cargo bed in a tractor side operator's cab. Therefore, there are many cases where the driver in the driver's cab on the tractor side cannot grasp this when the trailer side cargo bed is greatly tilted due to centrifugal force during turning and the rear wheel on one side is lifted off the ground. It was

[0003]

In such a conventional example, the following problems have been pointed out. That is, as described above, at the time of turning etc., the driver in the driver's cab on the tractor side cannot grasp the abnormal inclination of the cargo bed on the trailer side and the lift-up from the ground of the rear wheel on one side. It has been pointed out that the problem may occur. Of course, if the driver can accurately grasp such tilting and rising of the loading platform,
By performing the corresponding operation, a fall accident can be prevented in advance.

In view of the above situation, the present invention has been made to solve the problems of the above-mentioned conventional example, in which a detecting means such as a limit switch is provided under the cargo bed and is interposed between the vehicle and the axle. By detecting the displacement of the link rod,
First, a fall accident is avoided, and second, because the alarm means in the driver's cab is activated immediately before the rear wheel on one side floats up or before the trailer falls down due to floating up.
Moreover, it is an object of the present invention to propose a rear wheel lift warning device for a trailer, which realizes this easily and easily.

[0005]

The technical means of the present invention for solving such a problem is as follows. First, claim 1 is as follows. That is, this claim 1
The trailing wheel lift warning device of the trailer is used in a vehicle in which the trailer is connected to the tractor by a coupler. Then, the left and right detecting means provided below the loading platform of the trailer, the link rods respectively interposed between the left and right detecting means and the rear wheel axle of the trailer, and provided in the driver's cab of the tractor And an alarm means that operates based on a detection signal from either the left or right detection means. And, while the cargo bed and the axle are always parallel to each other, the cargo bed is greatly tilted during turning or the like, and one side of the cargo bed approaches the axle and the other side of the left and right is the axle. It is set to detect the displacement of the corresponding link rod on either the left or right side, for example, by the detection means on the other side, just before the rear wheels on the other side float up from the ground. And

Next, claim 2 is as follows. That is, the trailing wheel lift-up warning device according to claim 2 is used in a vehicle in which the trailer is connected to the tractor by a coupler. Then, a detection means provided on either the right or left side of the trailer of the trailer, a link rod interposed between the detection means and the rear wheel axle of the trailer, and provided in the driver's cab of the tractor. And alarm means which operates based on the detection signal from the detection means. And, while the cargo bed and the axle are always parallel to each other, the cargo bed is greatly tilted during turning or the like, and one side of the cargo bed approaches the axle and the other side of the left and right is the axle. The detecting means is set so as to detect the corresponding displacement of the link rod just before the rear wheel on the other side is lifted from the ground.

Next, claim 3 is as follows. That is, the trailer rear wheel lift warning device according to claim 3 is the trailer rear wheel lift warning device according to claim 1 or 2, wherein a limit switch is used as the detection means, and the limit switch It is characterized in that detection is performed by switching. Claim 4 is as follows. That is, this claim 4
The trailing wheel lift warning device for a trailer according to claim 1 is the trailer trailing wheel lift warning device according to claim 1 or 2, wherein the detection by the detection means is such that the other rear wheel from the ground is detected. It is not on the verge of floating, but instead of this, it is performed by the corresponding displacement of the link rod before the rear wheel on the other side floats from the ground and the trailer falls.

In the trailer rear wheel lift warning device according to claims 1, 2, 3 and 4 of the present invention, the detection means such as the limit switch is provided under the trailer's load carrier in this way, and the rear wheel axle The displacement of the link rod interposed between is detected. And, when turning etc., the loading platform tilts greatly,
The warning means in the driver's cab of the tractor is activated immediately before the rear wheel on one side floats above the ground or before the trailer falls down due to floating.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments of the invention shown in the drawings. FIG. 1, FIG. 2,
FIG. 3 is provided for explaining the embodiment of the present invention. FIG. 1 (1) is an overall side view, FIG. 1 (2) is a normal rear view, and FIG. 2 is a state in which a luggage carrier is tilted. Rear view, FIG. 3 is a rear view in which the rear wheels are lifted.

The trailing wheel lift warning device 2 of the trailer 1 is used in a vehicle in which the trailer 1 is connected to a tractor 3 by a coupler 4 as shown in FIG. 1 (1). That is, on the rear portion of the frame 5 of the tractor 3, the front end portion of the trailer 1 has the upper and lower couplers 4 including kingpins.
It is used in a vehicle of a type in which the tractor 3 and the trailer 1 are pivotally supported via the tractor 3 and are swingably connected to the left and right. The tractor 3, which is a towing vehicle, includes a cab 6, which is a cab, in the front, a frame 5, and a pair of front and rear wheels 7. On the other hand, in the trailer 1, for example, a tank or the like is mounted on the luggage carrier 8, and the rear wheel 9 is provided below the rear end of the luggage carrier 8 via the frame 5. In the illustrated example, the wheels 7 of the tractor 3 consist of one pair of front and rear wheels, but the front and rear wheels 7 of the front and rear wheels may be of a two-axis type instead. Further, the rear wheel 9 of the trailer 1 is composed of a pair of front and rear biaxial systems, but of course, for example, a monoaxial system or a triaxial system is also possible. The tractor 3 and the trailer 1 are generally configured like this.

The rear wheel lift warning device 2 of the trailer 1 is applied to such a vehicle. The rear wheel lift warning device 2 in the illustrated example is provided between the left and right detecting means 10 provided below the loading platform 8 of the trailer 1, and the left and right detecting means 10 and the axle 11 of the rear wheel 9 of the trailer 1, respectively. The link rods 12 and 13 and the alarm means 14 provided in the driver's cab 6 of the tractor 3 and operating based on the detection signal from the detection means 10 are provided. While the cargo bed 8 and the axle 11 are always parallel to each other (see FIG. 1 (2)), the cargo bed 8 is largely tilted when turning (see FIG. 2 for the tilted state A). 1), the left and right one sides of the cargo bed 8 approach the axle 11, and the other left and right sides separate from the axle 11. Therefore, just before the rear wheel 9 on the other side floats up from the ground B (see FIG. 3 for the floating state C), the corresponding displacement of the link rods 12 and 13 is detected on either the left or right side, for example, the detection means 10 on the other side. Is set to detect.

The rear wheel lift warning device 2 of the illustrated example will be described in more detail. First, the detection means 10
In the illustrated example, a limit switch 15 is used, and the limit switch 15 is attached to each of the left and right frames 16 below the loading platform 8 and thus is located on the axle 11 of the rear wheel 9. In the illustrated example, the rear wheel 9 of the trailer 1 has two front and rear wheels.
The limit switch 15 is provided so as to be positioned on the axle 11 either before or after it, though it is of an axle type.

Then, such a limit switch 1
5 and the axle 11 between the link rods 12 and 13 respectively.
Is interposed. That is, the link rods 12, 13
Has one end of the horizontal link rod 12 pivotally attached to the limit switch 15 side by a pin 17, and the other end of the horizontal link rod 12 pivotally attached to an upper end of the vertical link rod 13 by a pin 17. The lower end of the vertical link rod 13 is pivotally attached to the left and right of the axle 11 by the pin 17. Therefore, in the illustrated example, the bending angle of the horizontal link rod 12 with respect to the vertical link rod 13 corresponds to a vertical distance change with respect to the axle 11 of the loading platform 8 from, for example, a normal right angle to an acute angle or a separation when approaching. In case of obtuse angle, it is displaced respectively. Thus, the change in the vertical distance of the loading platform 8 with respect to the axle 11 is grasped as the displacement of the link rod 12 via the link rod 13, and thus the link rod 12
It is set so that the contact of the limit switch 15 is switched and the detection as the detection means 10 is performed by the predetermined displacement operation.

In the illustrated example, the limit switch 15 is used as the detecting means 10 as described above, and the link rods 12 and 13 are interposed. However, the rear wheel lift warning device 2 of the present invention is not limited to such an illustrated example, and various other detecting means 10 and link rods 12 and 13 can be adopted. For example, the detection means 10
For this purpose, it is conceivable to use a proximity switch, a photo sensor, an air valve, or the like (as a detection signal transmitting means in these cases, of course, means such as electricity, light, or air is appropriately selected), or a vertical Only the link rod 13 is used, the lower end of which is fixed to the axle 11, and the upper end of the link rod 13 is used as the detecting means 1.
A configuration in which it is attached to a lever of 0 or the like is also possible.

Next, in the rear wheel lift warning device 2, the warning means 14 comprises a lamp and a buzzer (both or either one) provided in the driver's cab 6 of the tractor 3. The alarm means 14 is activated when a detection signal is transmitted from either the left or right detection means 10 via a signal transmission means (not shown), and issues an alarm by light or sound. The rear wheel lift warning device 2 has such a detecting means 1 as described above.
0, link rods 12, 13, alarm means 14, etc. In the figure, 18 is a suspension mechanism,
As the suspension mechanism 18, a leaf spring or a bellows which is interposed between the left and right frames 16 and the axle 11 and is vertically expandable and contractible is used.

Normally, the cargo bed 8 and the axle 11 are parallel to each other (see FIG. 1 (2)), and the vertical distance between the cargo bed 8 and the axle 11 is constant on the left and right. On the other hand, during turning or when driving on a rough road with unevenness on one side of the road, the loading platform 8 is tilted with respect to the axle 11 due to centrifugal force or a vertical step, and the vertical distance between the loading platform 8 and the axle 11 is increased. Change (see tilted state A in FIG. 2). That is, one side on the left and right sides of the loading platform 8 approaches the axle 11, while the other side moves away from the axle 11. Corresponding to this, the detection means 10 including, for example, limit switches 15 provided on the left and right sides below the loading platform 8.
And link rods 12 and 13 interposed between the vehicle and the axle 11.
Is displaced, the vertical link rod 1 of the horizontal link rod 12
The angle with respect to 3 is displaced.

In this way, the cargo bed 8 is largely tilted, so that the rear wheel 9 on the side where the cargo bed 8 is separated from the axle 11 (the rear wheel 9 on the left side in the drawing) is about to float from the ground B (see FIG. 3). It is set so that the detecting means 10 can detect the displacement of the corresponding link rods 12 and 13 in the lifted state C). For example, when the loading platform 8 separates from the axle 11 and the ground B
The horizontal link rod 12 located on the side of the rear wheel 9 (the rear wheel 9 on the other side on the left and right, the rear wheel 9 on the left side in the drawing) on the verge of being lifted from the vertical link rod 13 has a predetermined obtuse angle from the right angle. The limit switch 15 is set to switch when it is displaced up to.

The rear wheel lift warning device 2 has such a configuration in the illustrated example, but the present invention is not limited to this.
Further, it is also possible to have the following first, second and third configurations. Firstly, in the illustrated example, as described above, the horizontal link rod 12 located on the rear wheel 9 side, which is on the front side (the left side in the drawing) on which the platform 8 is separated from the axle 11 and floats from the ground B, is The limit switch 15 (on the left side in the drawing) is set to switch by displacing the link rod 13 from a right angle to a predetermined obtuse angle (in this case, the limit switch 15 on the right side in the drawing does not switch). No), but regardless of this, you may set as follows. That is, the horizontal link rod 12 located on the side (right side in the drawing) opposite to the rear wheel 9 on the front side (left side in the drawing) where the platform 8 separates from the axle 11 and floats from the ground B (left side in the drawing).
However, it may be set so that the limit switch 15 (on the right side in the drawing) is switched by the displacement from a right angle to the vertical link rod 13 to a predetermined acute angle, and the detection as the detection means 10 is performed. (In this case, the limit switch 15 on the left side of the drawing does not switch).

Secondly, as described above in the illustrated example, the detection by the detecting means 10 such as the limit switch 15 causes the loading platform 8 to separate from the axle 11, and the rear wheel 9 on one side (left side in the drawing) from the ground B. Was set to take place just before the vehicle floats above the ground B, but instead of this, it is slightly later than this, that is, before one rear wheel 9 floats above the ground B and the trailer 1 falls over. Corresponding link rod 1
You may set so that it may be performed by the displacement of 2 and 13.
For example, it may be set such that the switching by the limit switch 15 is performed by a larger displacement of the lateral link rod 12, that is, a displacement to a larger obtuse angle or an acute angle.

Thirdly, in the illustrated example, as described above, the detecting means 10 such as the limit switch 15 and the link rod 1 are used.
Although 2, 3 and the like are arranged on the left and right under the luggage carrier 8 of the trailer 1, a configuration in which they are arranged only on either the left or the right is also possible. That is, the rear wheel lift warning device 2
And a detection means 10 such as a limit switch 15 provided only on one of the left and right sides below the loading platform 8 of the trailer 1,
Link rods 12 and 13 interposed between the detecting means 10 and the axle 11 of the rear wheel 9 of the trailer 1 and an alarm means provided in the driver's cab 6 of the tractor 3 and operated based on a detection signal from the detecting means 10. 14 may be included.

The configuration will be described in more detail.
According to the above-mentioned example of the illustrated example, the loading platform 8 is always used.
And the axle 11 are parallel to each other, the cargo bed 8 is largely tilted at the time of turning or the like, and one of the left and right sides of the cargo bed 8 is located on the axle 11
The other side of the left and right is separated from the axle 11, and the rear side wheel 9 on the other side is set to be detected by the detection means 10 just before the rear wheel 9 floats above the ground B. It Then, for example, when the horizontal link rod 12 is displaced from the vertical link rod 13 at a predetermined obtuse angle with respect to the vertical link rod 13, the detecting means 10 such as the limit switch 15 is arranged on the side (for example, the left side) where the link rod 12 is disposed. It is detected that the loading platform 8 is separated from the axle 11 and the rear wheel 9 is about to be lifted from the ground B. On the other hand, when the vehicle is displaced from a right angle to a predetermined acute angle, the loading platform 8 is separated from the axle 11 and the rear wheel 9 is about to float from the ground B on the side opposite to the side where the vehicle itself is disposed (for example, the right side). Detect the effect. Rear wheel lift warning device 2 of the present invention
As described above, various configurations not shown in the drawings are possible.

The present invention is constructed as described above. Then it becomes as follows. In the rear wheel lift warning device 2 of the trailer 1, the detecting means 10 such as the limit switch 15 is provided below the loading platform 8 of the trailer 1 and the link provided between the rear wheel 9 and the axle 11 is provided. The displacement of the rods 12 and 13 is detected. Then, when the cargo bed 8 is largely tilted (see FIG. 2) when turning, the rear wheel 9 on one side is on the verge of being lifted from the ground B (see FIG. 3), or is slightly lifted or slightly lifted, and the trailer 1 falls over. Before the operation, the alarm means 14 in the driver's cab 6 of the tractor 3 is activated. Then, the rear wheel lift warning device 2 of the trailer 1 has the following first, second, and third configurations.

First, since the alarm means 14 is used for alarming as described above, the driver of the operator's cab 6 of the tractor 3 receives an abnormal tilt of the loading platform 8 of the trailer 1 and the ground B of the rear wheel 9 on one side. It is possible to immediately and accurately grasp the rise of the.

Secondly, this is also provided with a detection means 10 such as a limit switch 15 under the cargo bed 8 of the trailer 1,
By linking the link rods 12 and 13 with the axle 11 and providing the warning means 14 in the driver's cab 6 of the tractor 3, this can be realized easily and easily.

Thirdly, in the illustrated example, as described above, although the predetermined displacement of the link rods 12 and 13 is set to be detected by the detection means 10 such as the left and right limit switches 15, the alarm means 14 is set. , Left or right detection means 1
It is set to operate based on a detection signal from zero. That is, when both of the detection means 10 such as the left and right limit switches 15 detect the displacement of the link rods 12 and 13, the alarm means 14 does not operate. Therefore, in the illustrated example, when the cargo bed 8 is tilted and the rear wheel 9 on one side is lifted from the ground B during turning or when traveling on a rough road with unevenness on one side of the road, the detection means 10 detects the alarm means. An alarm is implemented at 14. On the other hand, when traveling on a bad road where unevenness exists over the entire width of the road, the detecting means 1
Since both 0 detect, no alarm is issued by the alarm means 14. In other words, in this case, even if the rear wheels 9 on both the left and right sides are lifted up, the cargo bed 8 does not ascend horizontally and tilt left and right while being parallel to the axle 11, so there is no danger of the trailer 1 tipping over. There is no need for an alarm.

[0026]

As described above, the trailer rear wheel lift warning device according to the present invention is provided with a detecting means such as a limit switch under the loading platform to detect the displacement of the link rod interposed between the trailer and the axle. By detecting it, the warning means in the driver's cab is activated immediately before the rear wheel on one side floats up or before the trailer falls down due to the floating, so that the following effects are exhibited.

First, a fall accident is avoided. That is, the warning of the trailer rear wheel lift warning device allows the driver in the driver's cab on the tractor side to accurately grasp the abnormal inclination of the trailer loading platform and the lift of one rear wheel from the ground. Therefore, unlike the above-described conventional example of this type, the driver can immediately perform the corresponding operation, and thus can prevent the trailer from falling over.

Second, and yet this is easily accomplished. That is, the trailing wheel lift warning device of this trailer is provided with a detection means such as a limit switch under the loading platform.
The link rod is provided between the vehicle and the axle, and the warning means is provided in the driver's cab, so that the above-described first point can be easily realized with a simple configuration. As described above, the effects exhibited by the present invention are remarkable and large, for example, the problems existing in this type of conventional example are surely solved.

[Brief description of drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of the entire trailer and a rear view of the trailer lift-up warning device according to the present invention for explaining the embodiments of the invention.

FIG. 2 is a rear view for explaining the embodiment of the present invention and showing a state where the loading platform is tilted.

FIG. 3 is a rear view for explaining the embodiment of the present invention and showing a state where a rear wheel is lifted.

[Explanation of symbols]

 1 Trailer 2 Rear wheel lift warning device 3 Tractor 4 Coupler 5 Frame 6 Driver's cab 7 Wheels 8 Loading platform 9 Rear wheel 10 Detecting means 11 Axle 12 Link rod 13 Link rod 14 Warning means 15 Limit switch 16 Frame 17 Pin 18 Suspension mechanism A Tilt Standing state B Ground C Standing up

Claims (4)

[Claims] 1. A rear wheel lift warning device for a trailer in a vehicle in which a trailer is coupled to a tractor by a coupler, the left and right detection means being provided under a cargo bed of the trailer, and the left and right detection means. And a link rod interposed between the trailer and an axle of the rear wheel of the trailer, and an alarm means provided in the driver's cab of the tractor and activated based on a detection signal from the detection means on either the left or right side. In general, the load carrier and the axle are parallel to each other,
When the turntable etc. greatly tilts, one side of the left and right sides of the load stand approaches the axle and the other side of the left and right moves away from the axle, so that the rear wheel on the other side is about to float from the ground. A rear wheel lift warning device for a trailer, characterized in that the displacement of the link rod is set to be detected by one of the left and right detecting means on the other side. 2. A rear wheel lift warning device for a trailer in a vehicle in which a trailer is connected to a tractor by a coupler, the detecting means being provided on either the left or right side of the trailer under the cargo bed, and the detecting means. Means and a rear wheel axle of the trailer, and a warning means provided in the driver's cab of the tractor and operating based on a detection signal from the detection means. , While the cargo bed and the axle are always parallel,
When the turntable etc. greatly tilts, one side of the left and right sides of the load stand approaches the axle and the other side of the left and right moves away from the axle, so that the rear wheel on the other side is about to float from the ground. A rear wheel lift warning device for a trailer, wherein the displacement of the link rod is set to be detected by the detecting means. 3. The trailing wheel lift warning device according to claim 1 or 2, wherein a limit switch is used as the detecting means, and detection is performed by switching the limit switch. Rear wheel lift alarm system for trailers. 4. The trailing wheel lift warning device according to claim 1 or 2, wherein the detection by the detection means is not on the verge of lifting of the other rear wheel from the ground, as described above. Instead, before the trailing wheel of the other side floats above the ground and the trailer falls,
A rear wheel lift warning device for a trailer, which is performed by corresponding displacement of the link rod.