JP2598378Y2 - Vehicle load measuring device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle load measuring device, and more particularly, to a vehicle load measuring device that measures a load by arranging a sensing element for detecting strain in a predetermined portion of the vehicle.

[0002]

2. Description of the Related Art Conventionally, load measurement of a vehicle is mainly performed on a large vehicle such as a truck. This is done for the purpose of preventing overloading of trucks, etc., which not only impairs the driving operability of the vehicle itself and causes a traffic accident but also causes damage to the vehicle and the road surface. ing. Normally, the load of a vehicle is measured by a load measuring device installed on the road. A wheel is mounted on a load plate provided with a load converter, and the wheel weight or axle weight of the wheel is measured. And the like are added to determine the vehicle weight, and further, the weight of the occupants or the vehicle itself is subtracted from the measured vehicle weight to determine the loaded load amount.

However, the above-mentioned load measuring device itself is large and the installation cost increases, so that there are restrictions on the installation place and the number of installations. For this reason, the number of vehicles that can be subjected to the measurement of the loaded weight is only a small part of the entire vehicle, and is insufficient to prevent overloading. Therefore, for example, as shown in FIG. 6, a sensing element 10 such as a strain gauge type sensor is fixed to the upper surface of the axle 30 (axle case) of the vehicle by welding or the like, and the load from the bed is applied to the axle 30 via a leaf spring. A so-called self-weight meter has been proposed in which the sensing element 10 detects a bending strain occurring on the axle 30 and measures the loaded load for each vehicle.

[0004]

[Problems to be Solved by the Invention] However, even though the weight of the weight meter is constant, the detection value may vary depending on the state of the vehicle or a change with time, and the reliability of the weight meter may be poor. was there. As an example of such a case where the detected values are different, for example, as shown in FIG. 7, when the road surface condition is bad and the axle 30 is inclined, the vector direction of the load applied to the axle is different, so that the distortion of the sensing element 10 is also reduced. The detected values differ differently.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a load measuring device for a vehicle in which even if the road surface is inclined and the vehicle body is inclined, its influence does not appear in the detected value.

[0006]

According to a first aspect of the present invention, there is provided a vehicle load measuring apparatus which measures a load by arranging a sensing element for detecting strain in a predetermined portion of the vehicle. In the vehicle load measuring device, the sensing element is formed in a pin shape, and a hole is formed in the center of a shackle pin that couples a shackle supporting a vehicle suspension and a bracket attached to a carrier frame, The sensing element is fitted and arranged in the hole, and is located on the surface of the shackle pin.
Provide a positioning groove and insert a pin fixing bolt into the positioning groove.
And rotate the shackle pin with respect to the bracket
It is characterized by being fixed so that it does not .

[0007] In the above structure, the load of the vehicle is coupled to the bracket and the shackle via the bracket sheet
According to the turbocharger Tsu Kurupin. Therefore, acts shear forces to shut Kurupin, movable load of the vehicle is detected by the sensing element disposed therein is distorted. Also,
A positioning groove is provided on the surface of the
When the sing elements are fitted into the holes
If the load direction to the sensing element is matched,
Use the groove to rotate the shackle pin relative to the bracket
By fixing so that there is no
The direction is always a fixed direction.

[0008]

[0009]

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Generally, large vehicles such as trucks
As shown in the exploded perspective view of FIG. 1, a leaf spring 31 is used as a suspension. One end of the leaf spring 31 is supported by a bracket 33 attached to a carrier frame 32, and the other end is supported by another bracket 33 via a shackle 34. An axle (axle case) 30 (see FIG. 6) is attached to the center of the leaf spring 31.
Axle (axle case) 30 through the shackle 34
It is supposed to take.

Therefore, in the vehicle load measuring device according to the embodiment of the present invention, as shown in FIG. 2A, which is a sectional view of the device, a bracket 33 fixed to a carrier frame 32 (see FIG. 1). Has a cylindrical shackle pin 3 fitted therein, and a shackle 34 is rotatably connected to the shackle pin 3. A groove 3 a is provided on the surface near the end of the shackle pin 3, and when the bracket 33 and the shackle 34 are connected, the pin fixing bolt 16 is removed from the hole on the side surface of the bracket 33.
shackle pin 3 by inserting and tightening
Are fixed to the bracket 33 so as not to rotate.

As shown in the figure, a hollow hole 3b provided with a screw groove 3c near the entrance is formed in the center of the shackle pin 3, and a strain gauge is provided inside the hole 3b. A sensing element 2 of a type is fitted and mounted.
The sensing element 2 is made of a magnetic material, and has a cylindrical shape at both ends and a plate shape at the center,
A resistance wire 2a as a sensing part is adhered to that part, and a lead wire 2 drawn out from the resistance wire 2a is attached.
c is guided through the hole 3b of the shackle pin 3 and
From the outside. At the entrance of the hole 3b, a plug 17 for mudguard is screwed using the screw groove 3c, so that the plug 17 is provided with a hole through which the lead wire 2c passes. The hole 3d provided on the opposite side of the shackle pin 3 from the hole 3b is a hole for supplying grease. FIG. 2B is a side view of the portion shown in FIG.

With the above structure, when the load of the vehicle is applied to the shackle pin 3 via the bracket 33 as the load F, a shearing force acts on the shackle pin 3 and the sensing element 2 disposed inside is distorted. As a result, the sensing output changes and the load on the vehicle is detected. In this case, since only the shearing force acts on the sensing element 2, the detected value is not affected by the inclination of the road surface or the like.

As described above, since the existing shackle pin 3 is used, it is easy to newly add a load measuring device, and the shackle pin 3 is conventionally provided with a grease supply hole on one side. Since it is open, there is no problem in strength even if a hole for the sensing element 2 smaller than this hole is added to the other side.

Since the positioning groove 3a is provided on the surface of the shackle pin 3, if the sensing element 2 is fitted in the hole 3b of the shackle pin 3, the load direction on the sensing element 2 should be adjusted. When the shackle pin 3 is fitted and fixed to the bracket 33, the pin fixing bolt
If tightened 16 is inserted into the groove 3a of the hole of the side surface of the bracket 33, the shackle pin 3 bracket 33
, The load on the sensing element 2 can always be kept constant.

By the way, in order to fit the sensing element 2 into the cylindrical hole 3b of the shackle pin 3 and to surely transmit the deformation of the shackle pin 3 to the sensing portion, the cylindrical elements at both ends of the sensing element 2 are required. It is sufficient that the part is precisely concentric and fitted and arranged in the hole 3b. A sensing element preferably applied to the vehicle load measuring device of the present invention will be described with reference to FIGS.

As shown in FIG. 3 (a), the sensing element 2 and two fixation members 2d which holes 2d ₁ is formed in the central portion in the cylindrical convex portion 2e ₁ is formed at both ends And a plate-like member 2e. Then, as shown in FIG. 3 (b), respectively fitted to the convex portion 2e ₁ of the plate-like member 2e into the hole 2d ₁ fixation members 2d, both members 2d, by welding the ends in contact of 2e Sensing Element 2 is completed. At this time, as shown in FIG. 4, if the welding is performed by sandwiching the fixing members 2 d at both ends of the sensing element 2 with the eccentricity regulating tool 4, the sensing element 2 without eccentricity can be obtained.

Since the above-described sensing element 2 is configured as described above, the plate-like member 2e on which the sensing unit is provided does not bend or distort at the time of manufacture, and thus the fixing members at both ends of the sensing element 2 are provided. 2d is not eccentric. Further, when the sensing element 2 is of a magnetostrictive type, only the plate-like member 2e serving as the central portion can be made of a member such as permalloy, so that the material can be easily obtained.

The sensing element 2 completed as described above
Is fitted into the hole 3b of the shackle pin 3 shown in FIG. At this time, if an adhesive is applied to the surface of the fixing member 2d, it is fixed to the inner surface of the hole 3b of the shackle pin 3.

Next, a capsule member of a sensing element applied to a load measuring device for a vehicle will be described with reference to FIG. Capsules member has two anchoring members 2d which holes 2d ₁ of substantially rectangular in the center a cylindrical shape is formed in both ends, these fixing members 2d are coupled concentrically by the arm 2f. Note that these are formed as an integrally molded product.

On the other hand, FIG. 5 (b) shows a plate-like member 2e provided with a sensing part (not shown) at the center, and as shown in FIG. 2e was allowed to pass through the hole 2d ₁ from the outside of one of the fixing member 2d of the capsule member inserted to inside hole 2d ₁ of other fixation members 2d,
An end portion where both members 2d and 2e are in contact with each other, that is, a fixing member 2d
Can be obtained sensing element 2 a contact portion between the opening portions of the four sides and the plate-like member 2e of the holes 2d ₁ welding to.

[0022]

[Effects of the Invention] As described above, according to the present invention,
Located inside by shear force acting on shackle pin
Of the vehicle due to the distorted sensing element
Since the weight is detected, even if the road surface is inclined and the vehicle body is inclined, it is possible to provide a vehicle load measuring device whose influence does not appear in the detected value. In addition, because the existing shackle pin is used, it can be installed without affecting the vehicle height, etc., and its characteristics change with the consumption of other vehicle parts, or replacement of other vehicle parts There is no need to replace them at the same time . Furthermore, to shackle pin
Load on the sensing element at the time of fitting into the provided hole
If the direction is matched, shackle using the positioning groove
Lupine is fixed to the bracket not to rotate.
Therefore, the load direction to the sensing element must be
Therefore, there is an effect that measurement accuracy can be obtained by a simple mounting operation .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a structure for supporting a leaf spring on a carrier frame in a large vehicle.

2A is a cross-sectional view of a shackle pin portion of a vehicle showing an embodiment of the device of the present invention, and FIG. 2B is a side view.

3A is an exploded perspective view of a sensing element applied to the vehicle load measuring device according to the present invention, and FIG. 3B is an assembly view.

FIG. 4 is a diagram illustrating eccentricity regulation when manufacturing the sensing element for a vehicle load measuring device according to the present invention.

5A is a perspective view of a capsule member of the sensing element, FIG. 5B is a perspective view of a plate member, and FIG.

FIG. 6 is a diagram showing an arrangement of a conventional load measuring sensor.

FIG. 7 is a diagram illustrating a problem in load measurement when the road surface is inclined.

[Explanation of symbols]

Second sensing element 3 shackle pin 3a positioning groove 3b holes 1 6 pin fixing bolt 3 2 bed frame 33 bracket 34 shackle

Claims (1)

(57) [Scope of request for utility model registration] 1. A vehicle load measuring device for measuring a load by disposing a sensing element for detecting a strain at a predetermined portion of a vehicle, wherein the sensing element is formed in a pin shape, and a shackle and a carrier for supporting a suspension of the vehicle. A hole is drilled in the center of the shackle pin that couples with the bracket attached to the frame, the sensing element is fitted in the hole, and positioned on the surface of the shackle pin.
A groove is provided, and a pin fixing bolt is inserted through the positioning groove.
The shackle pin does not rotate with respect to the bracket
A load measuring device for a vehicle characterized by being fixed as described above .