JP2591665Y2 - 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 load measuring device for a vehicle, and more particularly to a load measuring device for a vehicle which is characterized by an arrangement of a strain gauge type sensor used for measuring a load on 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 is very large and its installation cost is high, so that the installation place and the number of installations are very limited. 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, as shown in FIG. 9, a strain gauge sensor (sensing element) 63 is fixed between an axle case (axle) 61 and a leaf spring 62, and the amount of strain due to the load applied to the sensor 63 is measured. There is a type in which the load weight is measured for each vehicle.

[0004] When the vehicle is large and the rear wheels are attached to the front and rear, the axle cases are arranged in two rows in the front and rear direction. Therefore, as shown in FIG. The leaf spring 72 is fixed to the vehicle body by a mounting bracket 73, and both ends of the leaf spring 72 are located above the axle cases 74 and 75, respectively. In this case, the degree of curvature of the leaf spring 72 changes depending on the weight of the vehicle, and the relative length between the axle cases 74 and 75 changes.
The hemispherical slide plates 76 and 77 are arranged on the upper surface of the slide plate 72, and the end of the leaf spring 72 can slide on the surfaces of the slide plates 76 and 77.

Therefore, in this case, the sensor 78,
79 is fixed to the upper surfaces of the axle cases 74 and 75,
The slide plates 76 and 77 are fixed thereon. By doing so, the sensor 7 generated by the bending of the leaf spring 72 due to the change in the loaded weight
Since there is no lateral load on 5, 76, an accurate detection value can be obtained. FIG. 11 is an enlarged view of a part of FIG.

[0006]

However, as described above, when the strain gauge type sensor is arranged on the upper surface of the axle case and the leaf spring is received on the upper surface of the strain gauge type sensor, only the height of the sensor is increased. The bed of the vehicle will be high. For this reason, the workability at the time of the loading operation is deteriorated, and the work efficiency is reduced, and the burden on the worker is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a load measuring device for a vehicle in which the structure and arrangement of a sensing element such as a strain gauge type sensor are characterized and the degree of increase in the vehicle height is suppressed.

[0008]

According to the present invention, there is provided a vehicle load measuring apparatus for measuring a load of a vehicle using a sensing element, wherein the sensing element detects a longitudinal expansion and contraction as a strain and detects a load applied to the vehicle. Is a strain sensing element that measures, and is inserted between a leaf spring and an axle case used in the suspension of the vehicle such that the longitudinal direction is oriented substantially in the horizontal direction. The slide plate or the vehicle height adjustment is provided in at least one of at least any one of the concave space formed by the arch shape and the space provided inside the vehicle height adjustment plate. The longitudinal direction of the plate for use and the longitudinal direction of detecting the expansion and contraction of the sensing element as distortion are aligned in parallel. It is characterized in that a sensing element.

The present invention also relates to a vehicle load measuring device for measuring a load of a vehicle using a sensing element, which is used to fasten a U-bolt for binding an axle case of the vehicle to a leaf spring. The axle case is located below the top of the axle case and substantially at the same height as the center line of the axle axis in the axle case, and protrudes from the axle case in both directions on its side. And a sensing element inserted between an upper surface of the flange and a lower surface of the leaf spring.

The present invention also relates to a vehicle load measuring device for measuring a load of a vehicle using a sensing element, wherein a pin provided at an end of a leaf spring used for a suspension of the vehicle and a chassis of the vehicle are provided. A shackle provided with a plate-shaped member having a main surface arranged in parallel with the axis of the pin between the pin provided on the side support member and the plate coupled at least between the two pins The body-shaped member is integrally formed of one material, and at least the central portion of the main surface of the member has a shackle formed by forming a thin portion in the thickness direction, and has a flexure or expansion and contraction in the longitudinal direction. A strain sensing element for detecting as strain, the strain sensing element being disposed on a thin portion of the main surface of the shackle and detecting the strain of the portion.

The present invention also provides a vehicle load measuring device for measuring a vehicle load using a sensing element, wherein the main leaf spring and the auxiliary leaf spring used for the suspension of the vehicle are provided. A main leaf spring and an auxiliary leaf spring disposed so that the load is dispersed and applied from only the main leaf spring to the auxiliary leaf spring as the applied load increases, and the main leaf spring with respect to the chassis of the vehicle. A first sensing element disposed at a coupling portion for measuring a load applied to the main leaf spring, and a load applied to the auxiliary leaf spring disposed at a coupling portion of the auxiliary leaf spring to a chassis of the vehicle, Of the load measured by the first sensing element It is characterized in that a second sensing device for measuring a load applied to the operation of auxiliary leaf spring the summed by the load hanging on the vehicle and.

[0012]

According to a first aspect of the present invention, there is provided a vehicle load measuring apparatus for measuring a vehicle load using the sensing element according to the present invention, wherein a slide plate or a vehicle height adjusting plate is used for finely adjusting the vehicle height. Utilizing the fact that it is generally a thin member, and that it is arranged directly above the axle axis and the vehicle weight is concentrated, providing a space in this slide plate or vehicle height adjustment plate and arranging the sensing element, Moreover, since the sensing element is arranged in the cavity so that the longitudinal direction thereof is parallel to the slide plate, the horizontal plate expands and contracts with respect to the compressive load of the slide plate or the vehicle height adjusting plate, that is, the loaded load, The sensing element measures the expansion and contraction strain that has become easier to measure because it has been enlarged in the horizontal direction. Avoidance and can be carried out effectively correct vehicle weight measurements while.

According to a second aspect of the present invention, there is provided a vehicle load measuring device for measuring a vehicle load using the sensing element of the present invention, wherein a U-bolt or the like for connecting the vehicle axle case to a leaf spring is fastened. The axle case is located below the top of the axle case and at substantially the same height as the center line of the axle axis in the axle case, in both directions on the side of the axle case. Since the sensing element is formed between the upper surface and the lower surface of the leaf spring, it is possible to avoid an increase in vehicle height, and the flange is substantially the same as the center line of the axle shaft. By being able to arrange at the height, it is possible to arrange the sensing element at the position with the best symmetry around the axle axis, Even in the vicinity of the axle axis of the suspension part, which is the part that is extremely susceptible to both posture changes, the most symmetrical uniform load is applied to the two sensing elements arranged on the left and right sides. And accurate vehicle weight measurement can be performed.

According to a third aspect of the present invention, there is provided a vehicle load measuring device for measuring a vehicle load using the sensing element according to the present invention, wherein the shackle is formed to have a thinned portion or a hollow portion formed by hollowing the thinned portion. The shackle is the one-piece molded part, the part where the most load is concentrated and the part where the largest deflection is the most directly measurable part. Since the sensing element is arranged in the thinned part of the shackle, the most direct and largest deflection of the shackle can be measured, and accurate vehicle weight measurement can be achieved while avoiding an increase in vehicle height. Can be.

According to a fourth aspect of the present invention, there is provided a vehicle load measuring device for measuring a vehicle load using the sensing element according to the present invention, wherein the vehicle includes a suspension using a main leaf spring and an auxiliary leaf spring. A sensing element that detects the load received by the spring is attached to the main leaf spring coupling part to the vehicle chassis,
Sensing elements that detect the load received by the auxiliary leaf springs are arranged at the joints of the auxiliary leaf springs to the chassis of the vehicle, so that as the load increases, the main leaf springs and the auxiliary leaf springs are dispersed, and Loads that cannot be accurately measured only from the arranged sensing elements are individually detected by the sensing elements arranged on the main leaf spring and the auxiliary leaf spring, respectively, and the measured values of those loads can be summed, resulting in an increase in vehicle height It is possible to measure the total accurate load applied to the vehicle without the need.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1A shows a carrier frame 1 of a vehicle.
Assembled parts such as an axle case 2, a leaf spring 3, and a vehicle height adjusting plate 5 are shown in an exploded perspective view, and two support portions 1a are provided on a side surface of the carrier frame 1. Both ends of the leaf spring 3 are supported by the support portion 1a. The center of the leaf spring 3 is fixed to the axle case 2 by a mounting member 6, and the vehicle height adjusting plate 5 is sandwiched between the leaf spring 3 and the axle case 2.

The strain gauge type sensing element used in the vehicle load measuring device according to the present invention is built in the vehicle height adjusting plate 5, which is shown in FIG.
As shown in detail, the shape is a rectangular plate having a thickness, and a concave portion 5a is provided in the center thereof.
The sensing element 7 is fitted and fixed in a by an adhesive or welding. In addition, the lead wire pulled out from the sensing element 7 and a device for measuring a load are not shown.

As described above, since the strain gauge type sensing element 7 is fitted in the vehicle height adjusting plate 5 sandwiched between the axle case 2 and the leaf spring 3, the conventional axle case and leaf As compared with the sensor in which the sensing element is interposed between the spring and the spring, the amount of increase in the height of the loading platform can be reduced, and the workability in the loading operation does not decrease.

Next, a second embodiment of the present invention will be described. FIG. 2 shows an axle case 12 (12a, 12a,
12b), leaf spring 13, slide plate 1
5 (15a, 15b) are shown as exploded perspective views. In this case, since the axle cases 12 are arranged in two rows in front and back, the leaf springs 13 are attached at their center portions to a carrier frame (not shown). It is located at.

Since the degree of curvature of the leaf spring 13 changes depending on the weight of the vehicle and the relative length of the leaf spring 13 to the axle case 12, a slide plate 15 (15a, 15b) having a hemispherical cross section is arranged on the upper surface of the axle case 12. The end of the leaf spring 13 can slide on these slide plates 15.

A sensing element 7 of the strain gauge type used in the vehicle load measuring device according to the present embodiment is fitted in the slide plate 15. This way,
Since a lateral load on the sensing element 7 caused by the bending of the leaf spring 13 due to a change in the loaded weight is not received, an accurate detection value can be obtained, and the height of the loading platform is not increased. Does not lower the workability. Also, parts such as a case forming the sensing element 7 become unnecessary,
The assembly can be simplified and the cost can be reduced.

Next, a third embodiment of the present invention will be described. The same members as those described in the first embodiment are denoted by the same reference numerals.

FIG. 3 shows the arrangement of the strain gauge type sensing element 10 used in the load measuring device according to the embodiment of the present invention. As shown in the figure, sensor mounts 11, 11 are provided on the upper and lower surfaces of axle case 4 having a rectangular cross section.
Are fitted. The center of the sensor mounting base 11 is concave in a sectional view, and the left and right are flat flanges 11.
a, and a screw hole (not shown) is formed in this portion. The sensor mounting base 11 is covered from the upper and lower surfaces of the axle case 4 and its flange 11
a is a strain gauge type sensing element 1
0 is fixed and fixed with a screw 20 and a nut 21.

The upper surface of each sensing element 10 is in contact with the lower surface of the leaf spring 13 and is fixed using a U-shaped stopper 22 so as not to shift. In this state, a slight gap is provided between the upper surface of the sensor mounting base 11 covering the upper surface of the axle case 4 and the lower surface of the leaf spring 13, and the weight applied to the leaf spring 13 is different from that of the sensing element 10. The axle case 4 is configured to hang on the axle case 4 via the sensor mount 11. The height increase amount of the carrier frame 1 due to the mounting of the sensing element 10 is a distance d between the upper surface of the axle case 4 and the lower surface of the leaf spring 13.

Since the distance d can be made smaller than the height of the sensing element 10 itself, the height of the platform can be kept low, and the workability in the loading operation does not decrease.

Next, a fourth embodiment of the present invention will be described.

FIG. 4 shows a side view of a vehicle using a load measuring device according to a fourth embodiment of the present invention. Normally, an axle case 34 of a large vehicle is attached to a leaf spring 33 as shown in the figure.
One end of the leaf spring 33 is supported by a bracket 35a attached to the carrier frame 31, and the other end of the leaf spring 33 is connected to a bracket 35b similarly attached to the carrier frame 31 via the shackle 32.
It is supported by.

In the case of such a structure, in order to measure the load, a sensing element is generally attached to a shackle pin 36 connecting the bracket 35b and the shackle 32, and the shearing force is measured. However,
To incorporate the sensing element, the shackle pin 3
It is necessary to make a hole in the center of 6 and put the sensing element in it, and when the diameter of the shackle pin 36 is small,
There is a possibility that the strength of the shackle pin 36 is reduced due to the hole processing.

Therefore, in the present embodiment, as shown in the front view of FIG. 5A, the sensing element 37 of the strain gauge type is replaced with a thin portion (called a "thief") 32 of the shackle 32.
It is attached to the place of a. When the sensing element 37 is of a strain gauge type, it is attached to the thin portion 32a. When the sensing element 37 is of a magnetostrictive type, FIG.
As shown in the cross-sectional view of (b), the thin portion 32a may be cut out and fitted therein. When the thin portion 32a of the shackle 32 is a so-called empty space having a thickness of zero, the magnetostrictive sensing element 37 is arranged so as to bridge the upper and lower ends of the empty space and is welded or the like. There is also a fixing method. Thin portion 32a of shackle 32
Alternatively, the vacant portion is usually formed with such a structure from the viewpoint of reducing the weight since little force is applied. Therefore, the sensing element 37
Does not affect the strength of the shackle 32 and does not increase the height of the loading platform, so that the workability in the loading operation is not reduced.

Next, a fifth embodiment of the present invention will be described.

FIG. 6 shows a side view of a vehicle using the load measuring device according to the fifth embodiment of the present invention. Normally, a suspension of a rear-wheel single-shaft heavy-duty truck includes a main leaf spring 53 supporting an axle case 52 and an auxiliary leaf spring mounted on the main leaf spring 53 so as to overlap the main leaf spring 53 as shown in the figure. 54. Main leaf spring 5
3 is a bracket 55 attached to the carrier frame 51.
And the supporting member 56, and the auxiliary leaf spring 54 is free.

Auxiliary leaf spring direct contact brackets 58, 58 are attached to the loading frame 51 side. When the vehicle travels on an uneven road surface and the vehicle is largely shaken, the auxiliary leaf spring 54 is turned on. It is configured to prevent swinging by hitting the direct contact brackets 58, 58. However, even when the vehicle is stationary, the auxiliary leaf spring 5 can be used when the load capacity is about 40% of the constant volume.
4 starts to come into contact with the direct contact bracket 58, so that the sensing element for measuring the loaded load is connected to the main leaf spring 53.
If only the pins of the brackets 55 and 56 are attached, accurate measurement cannot be performed.

Therefore, in this embodiment, as shown in FIG. 7, a sensor 57 incorporating a sensing element is also arranged on the side surface of the lower case 58a of the auxiliary leaf spring direct contact bracket 58. As shown in FIG. 8, the sensing element 57 may be interposed between the lower case 58a and the upper case 58b of the direct contact bracket 58.

As described above, according to the present invention, the load on the auxiliary leaf spring 54 is also reduced by the main leaf spring 53.
Because the total load can be measured by adding the load of
Accurate loading load can be measured. In addition, since the height of the loading platform is not increased, the workability in the loading operation is not reduced.

In the various embodiments described above, the strain gauge type is mainly used as the sensing element.
In addition, various types of sensing elements such as a magnetostrictive type and a piezo type can be referred to.

[0037]

As described above, according to the first aspect of the present invention, the expansion and contraction distortion of the slide plate or the vehicle height adjusting plate in the horizontal direction with respect to the compressive load, that is, the loaded load, is increased, and this horizontal expansion is achieved. The sensing element measures the expansion and contraction strain that has become easier to measure because it can effectively and accurately measure the weight of the vehicle. Therefore, the burden on the worker is not increased.

According to the invention of claim 2, the flange can be arranged at substantially the same height as the center line of the axle shaft,
The sensing element can be placed in the position with the best symmetry about the axle axis, and it is located on the left and right of the suspension axle axis, which is the part that is extremely susceptible to changes in the attitude of the vehicle Since the most symmetric and uniform load is applied to the two sensing elements, accurate vehicle weight measurement can be performed, and workability in loading work can be performed without increasing the vehicle height. Therefore, the burden on the worker is not increased.

According to the third aspect of the present invention, the most direct and largest deflection amount of the shackle can be measured, so that accurate vehicle weight measurement can be realized and the vehicle height can be increased. Therefore, the workability in the loading operation is not reduced, and the burden on the worker is not increased.

According to the present invention, as the load increases, the load is distributed to the main leaf spring and the auxiliary leaf spring, and the load that cannot be accurately measured only from the sensing element disposed on the main leaf spring is measured. And the auxiliary leaf springs are individually detected by sensing elements, and the measured values of those loads can be totaled, so that the total accurate load applied to the vehicle can be measured and accurate vehicle weight measurement can be performed. In addition to this, the vehicle height is not increased, so that the workability in the loading operation is not reduced, and the burden on the operator is not increased.

[Brief description of the drawings]

FIG. 1A is an exploded perspective view of an assembling portion of a vehicle carrier frame, an axle case, a leaf spring, a vehicle height adjusting plate, and the like, and FIG. 1B is an exploded perspective view of a vehicle height adjusting plate fitted with a sensing element. It is a perspective view.

FIG. 2 is an exploded perspective view of an assembly part such as an axle case, a leaf spring, and a slide plate.

FIG. 3 is a side view of an assembled part of an axle case, a leaf spring, a strain gauge type sensing element, and the like.

FIG. 4 is a side view of the vehicle.

FIG. 5A is a front view of a state in which a sensing element is attached to a shackle, and FIG. 5B is a cross-sectional view of the shackle shown in FIG.

FIG. 6 is a side view of a vehicle to which an auxiliary leaf spring is attached.

FIG. 7 is a perspective view of a state where a sensing element is attached to a side surface of an upper case of an auxiliary leaf spring direct contact bracket;

FIG. 8 is a front view of a state in which a sensing element is mounted between a lower case and an upper case of an auxiliary leaf spring direct contact bracket;

FIG. 9 is a view showing a state of attachment of a strain gauge type sensing element conventionally performed.

FIG. 10 is a diagram showing a state of attachment of a strain gauge type sensing element which has been conventionally performed.

FIG. 11 is a partially enlarged view of what is shown in FIG. 10;

[Explanation of symbols]

1, 31, 41, 51 Loading frame 2, 12, 42 Axle case 3, 13, 33, 43 Leaf spring 5 Height adjustment plate 7, 37, 57 Sensing element 10 Strain gauge sensing element 15 Slide plate 32 Shackle 58 Auxiliary leaf spring direct contact bracket

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshitaka Yasuda 3- 25-1, Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Isuzu Motors Corporation Kawasaki Plant (56) References JP-A-56-14922 (JP, A) 63-35661 (JP, U) JP 4-99041 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01G 19/08-19/12 B60T 8/18

Claims (4)

(57) [Scope of request for utility model registration] 1. A vehicle load measuring device for measuring a load on a vehicle using a sensing element, wherein the sensing element is a strain sensing element that detects a longitudinal load as a strain and detects a load applied to the vehicle. An interior of an arch-shaped slide plate or a concave space formed by the arch is inserted between a leaf spring used for a suspension of the vehicle and an axle case so that a longitudinal direction thereof is substantially horizontal. Of the slide plate or the vehicle height adjustment plate, at least one of the at least one of the spaces provided inside the vehicle height adjustment plate and the sensing position. The sensing element is arranged so that the longitudinal direction of detecting the expansion and contraction of the element as strain is aligned in parallel. Load measuring device for a vehicle, characterized in that the. 2. A vehicle load measuring device for measuring a load on a vehicle using a sensing element, wherein the flange is used to fasten a U-bolt for connecting an axle case of the vehicle so as to bind the axle case to a leaf spring. The axle case is formed at a position below the top of the axle case and at substantially the same height as the center line of the axle axis in the axle case so as to project from the axle case as a center in both directions on both sides of the axle case. And a sensing element inserted between an upper surface of the flange and a lower surface of the leaf spring. 3. A vehicle load measuring device for measuring a load of a vehicle using a sensing element, wherein a pin provided at an end of a leaf spring used for a suspension of the vehicle and a support member on a chassis side of the vehicle. A shackle provided with a plate-shaped member having a main surface disposed in parallel with the axis of the pin between the pin provided in the shackle, and the plate-shaped member coupled at least between the two pins Are formed integrally from one material, and at least the central part of the main surface of the member has a shackle in which a thin portion is formed in a thickness direction, and detects bending or expansion and contraction in the longitudinal direction as distortion. A strain sensing element, which is disposed at a thin portion of the main surface of the shackle and detects a strain at the portion, and a load sensing device for a vehicle. 4. A vehicle load measuring device for measuring a vehicle load using a sensing element, wherein the main leaf spring and the auxiliary leaf spring used in the suspension of the vehicle increase a load applied to the vehicle. A main leaf spring and an auxiliary leaf spring which are arranged so that the load is dispersed and applied from the main leaf spring only to the auxiliary leaf spring, and arranged at a coupling portion of the main leaf spring to the chassis of the vehicle. A first sensing element for measuring a load applied to the main leaf spring, and a load applied to the auxiliary leaf spring disposed at a coupling portion of the auxiliary leaf spring to a chassis of the vehicle, wherein the first Summed with the value of the load measured by the sensing element A second sensing element for measuring a load applied to an auxiliary leaf spring capable of calculating a load applied to the vehicle.