JPH11264757A - Mounting structure of sensor for measuring vehicle load - Google Patents

Abstract

(57) [Problem] To provide a mounting structure of a vehicle load measurement sensor that can lead a lead wire without performing complicated or difficult processing on a trunnion shaft when mounting a vehicle load measurement sensor on a trunnion shaft. To do. SOLUTION: When attaching a load measuring sensor 11 to an end 1b of a trunnion shaft 1, a sensor accommodation hole 1d formed along an axial direction from an end face 1c of the end 1b is formed in a central U-shaped curved portion. Without passing through to the side of the sensor housing hole 1d, it is stopped at the dimension up to the front side, and the communication from the deepest part of the small diameter part 1f located on the U-shaped curved part 1a side of the sensor receiving hole 1d to the outer peripheral surface of the end part 1b. A hole 1h is formed, and the lead wire 11b of the sensor 11 housed in the sensor housing hole 1d is drawn out of the end 1b from the small diameter portion 1f via the through hole 1h.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a load measuring sensor to a vehicle such as a truck.

[0002]

2. Description of the Related Art Vehicle load measurement is mainly performed for large vehicles such as trucks, and is carried out for the purpose of preventing traffic accidents such as rollover due to overloading and acceleration of deterioration of vehicles and road surfaces.

The load of a conventional vehicle is measured by mounting the vehicle to be measured on a platform scale commonly called a kankan. However, the facility can be installed because the facility is large and requires a large installation space. The number of platform scales is limited, so that many vehicles cannot be measured, and the installation cost increases.

Therefore, in recent years, a load measuring device mounted on a vehicle itself to measure a load has been provided. As a conventional technique for attaching a load detecting sensor to a vehicle,
For example, there is a sensor mounting structure disclosed in JP-A-9-133571.

In the sensor mounting structure disclosed in Japanese Patent Application Laid-Open No. Hei 9-133571, a through hole penetrating the center of a horizontal shaft portion at both ends of a trunnion shaft of a vehicle with a central U-shaped curved portion interposed therebetween is provided. The lead wire of the sensing element formed and accommodated in the through hole is connected to the U of the through hole.
It is pulled out of the trunnion shaft from the end on the side of the U-shaped curved portion, and is led to the lower space of the U-shaped curved portion.

[0006]

The conventional sensor mounting structure described above does not hinder the application to a trunnion shaft having a U-shaped curved portion in the center, but the trunnion shaft has such a U-shaped center. The shape is not limited to the one having the curved portion, and there is also a shape extending in a straight line throughout.

When the above-described mounting structure is applied to a straight trunnion shaft, a through hole is formed through the trunnion shaft over its entire length, and a lead wire of a sensing element housed at one end of the through hole is connected to the trunnion shaft. It will be pulled out of the trunnion shaft from the other end of the through hole.

However, when the load applied to the rear wheel is detected by the sensing element, when the sensing element is also accommodated at the other end of the through hole and the load is detected by the two sensing elements, the sensing element at the other end is required. However, the lead wire of the sensing element at one end cannot be pulled out of the trunnion shaft because of obstruction, and in the end, the conventional mounting structure described above cannot be applied to a straight trunnion shaft. There is a problem that it lacks versatility.

In addition, in the above-described conventional sensor mounting structure, even if it is applied to a trunnion shaft having a U-shaped curved portion in the center, it is expected that a typical truck will have a diameter of approximately 100 mm and a length of 300 mm. Since it is necessary to form a through hole at the center of the horizontal shaft portion, there is a problem that processing is difficult as a practical problem and is not practical.

A conventional technique applicable to a mounting structure of a sensor for measuring a load on a member having an axial shape of a vehicle, such as the above-described trunnion shaft or a shackle pin which is frequently used as a mounting portion of the sensor, is disclosed in Japanese Unexamined Patent Publication No. Hei. −
No. 248027 also proposes this.

In the sensor mounting structure disclosed in Japanese Patent Application Laid-Open No. Hei 3-248027, when the shaft-shaped member is horizontally arranged, one portion is located at an upper portion and the other is located at a lower portion of each peripheral surface at an interval in the axial direction. Sensor lead wire welded to
It is drawn out to one end of the shaft-like member by a communication hole separately formed inside the shaft-like member.

However, the above-mentioned Japanese Patent Application Laid-Open No. Hei 3-248
Also in the prior art of Japanese Patent No. 027, since the lead wires of the sensors arranged vertically dispersed must be led to one end of the shaft member, a communication hole having a complicated shape is formed inside the shaft member. And JP-A-9-13357
Processing is difficult as in the sensor mounting structure disclosed in Japanese Patent Application Laid-Open No. 1 (1994), and is not suitable for practical use.

The present invention has been made in view of the above circumstances,
A first object of the present invention is to provide a mounting structure for a vehicle load measurement sensor that can lead a lead wire without performing complicated or difficult processing on the trunnion shaft when mounting the vehicle load measurement sensor on the trunnion shaft. In addition, a second object of the present invention is to facilitate the processing that can be applied when attaching a sensor for measuring a vehicle load to a shaft-like member to which a vehicle load is applied, such as a shackle pin as well as a trunnion shaft. Another object of the present invention is to provide a mounting structure for a vehicle load measuring sensor which is highly versatile.

[0014]

According to the first aspect of the present invention, there is provided a vehicle load measuring sensor mounting structure according to the present invention, wherein the mounting structure is fitted to a trunnion bracket of a vehicle. An electric signal corresponding to a load applied to the trunnion shaft is generated by a sensor body on a trunnion shaft that supports a leaf spring at an end protruding outward in the vehicle width direction of the vehicle, and the electric signal is externally supplied to a lead wire. A sensor receiving hole formed at the end of the trunnion shaft and extending from the end surface of the end in the vehicle width direction, A through hole extending in the intersecting direction and communicating the sensor housing hole and the outer peripheral surface of the end portion, and housing the sensor main body in the sensor housing hole; Together, characterized in that the drawn out to the outside of the trunnion shaft to the lead wire through the hole from the sensor accommodation hole from the outer peripheral surface of the trunnion shaft.

According to a second aspect of the present invention, in the mounting structure for a vehicle load measuring sensor according to the present invention, the sensor receiving hole is formed at the end of the trunnion shaft so as to pass through the center of the end. The through hole is formed so as to penetrate the end portion in the vehicle width direction.

Further, in order to achieve the second object, the mounting structure for a vehicle load measuring sensor according to the present invention described in claim 3 is fitted to a trunnion bracket of a vehicle,
An electric signal corresponding to a load applied to the trunnion shaft is generated in a sensor main body at a trunnion shaft that supports a leaf spring at an end protruding outward in the vehicle width direction of the vehicle from the trunnion bracket, and the electric signal is generated. A structure for attaching a sensor that outputs to the outside via a lead wire, wherein the sensor body is formed on an outer peripheral surface of an end portion of the trunnion shaft, the end portion being fitted to the trunnion bracket. And a sensor housing groove in which the end of the trunnion shaft is fitted to the trunnion bracket from an inner end portion in the vehicle width direction with respect to the trunnion bracket in a state where the end is fitted to the trunnion bracket. A drawer formed on the outer peripheral surface of the end portion over the sensor housing groove and housing the lead wire The sensor body is housed in the sensor housing groove and the end portion is fitted to the trunnion bracket, and the sensor housing is inserted through a gap between the trunnion bracket and the draw-out groove. The lead wire is drawn out of the groove from the trunnion bracket, into which the trunnion shaft is fitted, to the outside of the trunnion bracket and to the inside in the vehicle width direction.

According to a fourth aspect of the present invention, there is provided a vehicle load measuring sensor mounting structure according to the present invention, wherein a shaft member connecting a plurality of members of a vehicle is provided with an electric signal corresponding to a load applied to the shaft member. A structure for mounting a sensor that generates the electric signal in the main body and outputs the electric signal to the outside via a lead wire, which is formed on an outer peripheral surface of a shaft member portion connecting the plurality of members of the shaft member, A sensor housing groove in which the sensor main body is housed, the shaft member portion, and a shaft member portion located outside the plurality of members in a state where the plurality of members are connected by the shaft member portion. A draw-out groove formed on the outer peripheral surface of the shaft member over the sensor housing groove and housing the lead wire, wherein the sensor body is housed in the sensor housing groove, and the sensor body is moved forward by the shaft member portion. In a state where a plurality of members are connected to each other, the lead wire from the sensor housing groove is moved outward from the plurality of members connected by the shaft member portion through a gap between the member and the drawing groove. It is characterized by being drawn out.

According to the mounting structure of the vehicle load measuring sensor according to the present invention, the lead wire of the sensor housing the sensor body in the sensor housing portion of the trunnion shaft is drawn out of the trunnion shaft. In order to form the sensor receiving hole, it is not necessary to form the sensor receiving hole at the end of the trunnion shaft in a dimension penetrating this end in the vehicle width direction, and it is sufficient to form the sensor receiving hole at a depth that can accommodate the sensor main body. Processing can be facilitated and practicality can be improved.

According to the mounting structure of the vehicle load measuring sensor according to the second aspect of the present invention, the opening of the through hole is formed at two places on the outer peripheral surface at the end of the trunnion shaft. Depending on the arrangement of the devices around the trunnion shaft, it is possible to select the outer peripheral surface of the end of the trunnion shaft from which the sensor lead wire is drawn.

Further, according to the mounting structure of the vehicle load measuring sensor according to the present invention, the lead wire of the sensor housing the sensor body in the sensor housing groove of the trunnion shaft is drawn out of the trunnion bracket. Therefore, it is not necessary to form a through-hole at the end of the trunnion shaft in a size that penetrates this end in the vehicle width direction, and it is only necessary to form the sensor housing groove and the lead-out groove on the outer peripheral surface of the end. Processing for forming the structure for mounting the sensor on the trunnion shaft is facilitated as compared with forming the structure for mounting the sensor inside the trunnion shaft, and the practicability can be improved.

Further, according to the mounting structure of the vehicle load measuring sensor according to the present invention, the sensor lead housing the sensor main body in the sensor housing groove of the shaft member connecting a plurality of members of the vehicle. In order to draw the wire out of the plurality of members, it is not necessary to form a through hole in the shaft member so as to penetrate the shaft member in the axial direction, and the sensor receiving groove and the drawing groove are formed on the outer peripheral surface of the shaft member. Therefore, the processing for forming the structure for mounting the sensor on the shaft member can be facilitated compared to forming the structure for mounting the sensor inside the shaft member, and the practicability can be improved. It becomes possible.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle load measuring sensor mounting structure according to an embodiment of the present invention.

First, the mounting structure of the vehicle load measuring sensor according to the first embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a sectional view of a main part of a mounting structure of a vehicle load measuring sensor according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a trunnion shaft of a vehicle, and 3 denotes the trunnion shaft 1. 5 shows trunnion base brackets for mounting to a chassis frame (not shown), respectively.

The trunnion shaft 1 has substantially cylindrical ends 1b connected to a U-shaped curved portion 1a substantially at the center in the vehicle width direction on both sides in the vehicle width direction (only one side is shown in FIG. 1). doing.

The trunnion base bracket 3 (corresponding to a trunnion bracket) has a fitting hole 3a into which the end 1b of the trunnion shaft 1 is fitted, and the fitting hole 3a is formed outside the end 1b. Inner diameter corresponding to diameter and end 1
b is formed with an extension dimension smaller than the dimension in the axial direction, and the end portion 1b of the trunnion shaft 1 is positioned from the inside in the vehicle width direction in a state where the axial direction thereof substantially matches the vehicle width direction. The fitting hole 3a is fitted outward.

In a state fitted in the fitting hole 3a of the trunnion base bracket 3, the end portion 1b of the trunnion shaft 1 protruding outward from the trunnion base bracket 3 in the vehicle width direction has a portion close to the front end. A spring receiver 5 is fitted, and a leaf spring 7 functioning as a vehicle suspension is mounted on the spring receiver 5 and fixed by a substantially U-shaped fixture 9.

As a structure for mounting a load measuring sensor indicated by reference numeral 11 in FIG. 1 to the end of the trunnion shaft 1, the mounting structure according to the first embodiment of the present invention is applied. The mounting structure according to the embodiment,
The trunnion shaft 1 includes a sensor housing 1d formed at each end 1b of the trunnion shaft 1 and a through hole 1h.

The sensor accommodating portion 1d (corresponding to a sensor accommodating hole) is formed from the end surface 1c of the end portion 1b of the trunnion shaft 1 to slightly before the U-shaped curved portion 1a. 1d extends in the axial direction through the center of the end 1b.
d is a large-diameter portion 1e near the end face 1c and a U-shaped curved portion 1a.
It is composed of a closer small-diameter portion 1f and a middle-diameter portion 1g connecting the small-diameter portion 1f and the large-diameter portion 1e.

The through hole 1h extends from the innermost portion of the small diameter portion 1f of the sensor housing portion 1d to the outer peripheral surface of the end portion 1b with an inner diameter smaller than the small diameter portion 1f and extends in the radial direction of the end portion 1b. The outer peripheral surface of the end 1b where the through hole 1h is opened is located inside the trunnion base bracket 3 in the vehicle width direction with the end 1b fitted in the fitting hole 3a. doing.

In the first embodiment, as shown in an enlarged perspective view of FIG. 2, the sensor 11 is a substrate 1 formed of a magnetic material such as permalloy and formed in a flat, substantially rectangular shape in plan view.
1c, four through-holes 11d are provided at intervals in the longitudinal direction of the substrate 11c and in the width direction orthogonal thereto, and two magnet wires 11 constituting a cross coil are provided.
e and 11e are wound around two through holes 11d and 11d facing in the longitudinal direction of the substrate 11c, and the other is wound into two through holes 11d and facing in the width direction of the substrate 11c. , 11d.

The reference numeral 11b in FIG.
b, two magnet wires 11 respectively drawn out
In the present embodiment, a sensor is formed by the above-described substrate 11c and a portion of the two magnet wires 11e, 11e excluding the lead wire 11b except for the lead wire 11b. The main body 11a is configured.

The sensor 11 detects a shearing strain acting on the substrate 11c in the vertical direction of the vehicle in a state where the longitudinal direction of the substrate 11c is aligned with the vehicle width direction of the vehicle and the sensor main body 11a is arranged in the vehicle. Thus, an electrical signal of a level corresponding to the shear strain is output from the lead wire 11b.

The sensor body 11 of the sensor 11
“a” is housed in the sensor housing portion 1d of each end 1b of the trunnion shaft 1 in a state of being housed inside the hollow case assembly 13 having a substantially cylindrical shape.

The outer diameter of the case assembly 13 is formed to be slightly larger than the inner diameter of the small diameter portion 1f of the sensor housing 1d.
Is formed to have a size corresponding to the outer diameter of the sensor body 11a housed therein, whereby the case assembly 13 housing the sensor body 11a therein is housed in the small-diameter portion 1f. The sensor body 11a is formed so that shear strain in the vertical direction of the vehicle does not act on the sensor main body 11a from the inner wall of the case assembly 13 due to factors other than a load from the case assembly 13.

Next, the operation of the mounting structure of the first embodiment configured as described above will be described.

In mounting the sensor 11 on the trunnion shaft 1, first, the lead wire 11
b is inserted into the sensor accommodating portion 1d of the end portion 1b of the trunnion shaft 1 from the end surface 1c, and the tip of the lead wire 11b is pulled out from the outer peripheral surface of the end portion 1b through the through hole 1h from the small diameter portion 1f.

Then, while pulling the lead wire 11b outward from the outer peripheral surface of the end 1b, the sensor main body 11a is inserted into the middle diameter portion 1g from the large diameter portion 1e of the sensor accommodating portion 1d together with the case assembly 13. , 1 g of medium diameter part to 1 of small diameter part
f, the sensor body 11a is inserted into the case assembly 1 in a state of being housed in the case assembly 13.
3, the small-diameter portion 1f of the sensor housing portion 1d at the end portion 1b.
To be housed.

Subsequently, the lead wire 11b drawn outward from the outer peripheral surface of the end portion 1b through the through hole 1h is connected to the trunnion base bracket 3 from the inside to the outside in the vehicle width direction.
While inserting the end portion 1b of the trunnion shaft 1 in the vehicle width direction from the inside to the outside in the vehicle width direction while inserting the end portion 1b of the trunnion shaft 1 in the vehicle width direction. It is inserted into the fitting hole 3a, and the end 1b is fitted into the fitting hole 3a.

Then, as shown in FIG. 1, the sensor 11 is disposed inside the fitting hole 3a of the trunnion base bracket 3, and the opening of the through hole 1h is located inside the trunnion base bracket 3 in the vehicle width direction. As a result, the lead wire 11b of the sensor 11, which is drawn out of the end 1b from the opening of the through hole 1h, is also arranged inside the trunnion base bracket 3 in the vehicle width direction.

When the end 1b of the trunnion shaft 1 is fitted into the fitting hole 3a of the trunnion base bracket 3 as described above, the end 1b projecting outward from the trunnion base bracket 3 in the vehicle width direction. A spring receiver 5 is fitted to a portion near the tip of the
The leaf spring 7 is mounted thereon and fixed by the fixture 9, and the sensor housing 1d is attached to the end face 1c of the end 1b.
A cap 15 for closing the opening is mounted.

The lead wire 11b of the sensor 11 drawn out of the end 1b from the opening of the through hole 1h is connected to a signal processing system such as an amplifier provided outside the trunnion shaft 1.

As described above, according to the mounting structure of the vehicle load measuring sensor of the first embodiment, when the shear force detecting sensor 11 for measuring the vehicle load is mounted on the end portion 1b of the trunnion shaft 1. , End face 1c of end 1b
From the sensor accommodation hole 1d formed along the axial direction from
The U-shaped curved portion 1a of the sensor receiving hole 1d is stopped at the dimension before the U-shaped curved portion 1a without penetrating the center U-shaped curved portion 1a.
A through hole 1h communicating with the outer peripheral surface of the end portion 1b is formed from the deepest portion of the small diameter portion 1f located on the side a, and the sensor housing hole 1d is formed.
The lead wire 11b of the sensor 11 housed in the small diameter portion 1f
From the end portion 1b through the through hole 1h.

For this reason, in order to pull out the lead wire 11b of the sensor 11 from the end 1b of the trunnion shaft 1, the end 1b is formed with a through hole having a large dimension extending from the end face 1c to the U-shaped curved portion 1a. The sensor accommodating hole 1d is formed at a size that can accommodate at least the sensor body 11a together with the case assembly 13, and the through hole 1h is formed from the outer peripheral surface of the end 1b until the sensor accommodating hole 1d is reached. As a result, the configuration for drawing out the lead wire 11b to the outside of the end 1b can be easily processed, and the practicability as a sensor mounting structure can be enhanced.

Next, the mounting structure of the vehicle load measuring sensor according to the second embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a sectional view of a main part of a mounting structure of a vehicle load measuring sensor according to a second embodiment of the present invention. The mounting structure of the second embodiment is a trunnion shaft indicated by reference numeral 1A in FIG. A through hole 1j formed in the end 1b of the end 1b penetrates in the radial direction of the end 1b, and extends in the circumferential direction of the end 1b.
The configuration is different from the mounting structure of the first embodiment in that it is open at each of two outer peripheral surfaces shifted by 0 ° phase, and the other configuration is the same as the mounting structure of the first embodiment. Have been.

According to the mounting structure of the second embodiment, the same effect as that of the mounting structure of the first embodiment can be obtained, and in addition, two through holes 1j are formed in the outer peripheral surface of the end portion 1b. Since it is open, as shown by the solid line in FIG. 3, the lead wire 11b is drawn out of the end 1b from one opening of the through hole 1j, or as shown by the imaginary line in FIG. It can be arbitrarily selected whether or not the lead wire 11b is drawn out of the end 1b from the other opening of the through hole 1j in accordance with the arrangement of the trunnion shaft 1, the components around the trunnion base bracket 3, and the like. Can be obtained.

Next, a mounting structure of a vehicle load measuring sensor according to a third embodiment of the present invention will be described with reference to FIGS.

FIG. 4 is a sectional view of an essential part of a mounting structure of a vehicle load measuring sensor according to a third embodiment of the present invention. The mounting structure of the third embodiment is a trunnion shaft indicated by reference numeral 1B in FIG. Instead of the sensor housing 1d and the through hole 1h, a sensor housing recess 1k and a wiring groove 1m are provided at the end 1b.
The mounting structure of the first embodiment in that it is formed on the outer peripheral surface of the vehicle and that two conventionally known strain gauges 11f are used as sensors 11 for detecting shear strain in the vertical direction of the vehicle. The configuration is different from that of the first embodiment, and the other points are the same as those of the mounting structure of the first embodiment.

The sensor accommodating recess 1k (corresponding to the sensor accommodating groove) has a substantially circular groove shape in plan view as shown in an enlarged perspective view in FIG. Equivalent) has a long groove shape extending along the axial direction of the end portion 1b over the entirety of the end portion 1b on the side of the U-shaped curved portion 1a from the sensor housing recess portion 1k. The wiring groove 1m is formed on the outer peripheral surface on the front end side or the rear end side in the front-rear direction of the vehicle.

4, the end 1b of the trunnion shaft 1B is fitted into the fitting hole 3a of the trunnion base bracket 3, and the sensor accommodation recess 1k is located outside the trunnion base bracket 3 in the vehicle width direction. In a state in which the spring receiver 5 is fitted to a portion of the end 1b protruding toward the front end, the spring 1 is formed substantially at the middle of the end 1b in the axial direction so as to straddle the boundary between the trunnion base bracket 3 and the spring receiver 5. ing.

Further, in the third embodiment, the two strain gauges 11f (corresponding to the sensor body) used for detecting the shear strain are provided in the sensor accommodating recess 1k in the vehicle width direction.
That is, they are arranged at an angle of 45 ° with respect to the horizontal direction so that their directions intersect at right angles. The lead wire 11b of the sensor 11 composed of these two strain gauges 11f, 11f is connected to the end 1b. Trunnion base bracket 3
In the vehicle width direction outside the trunnion base bracket 3 through a passage defined by the inner peripheral wall of the fitting hole 3a and the wiring groove 1m in a state where the fitting hole 3a is fitted to the fitting hole 3a. It is pulled out to a portion inside the trunnion base bracket 3.

In the mounting structure of the third embodiment configured as described above, when the load changes in the vehicle, the trunnion base bracket 3 and the spring receiver 5 apply forces to the trunnion shaft 1B in directions opposite to each other in the vertical direction. Works, and as a result, the sensor accommodating recess 1k at the end 1b
A shear force is generated in the portion where is formed, and the shear force is applied to the two strain gauges 11f, 11f,
The load of the vehicle is detected together with the output of the sensor 11 as detected by the sensor 11 composed of 11f.

According to the mounting structure of the third embodiment described above, like the mounting structure of the first embodiment, the sensor 11 is mounted on the end 1b and the lead wire 11b is drawn out of the end 1b. Since the configuration is not limited to simply forming a halfway hole, a configuration for that purpose is not formed inside the end 1b and a groove is formed on the outer peripheral surface of the end 1b. Further, it is possible to facilitate the processing of the configuration for drawing out the lead wire 11b to the outside of the end 1b, and to further enhance the practicality as the sensor mounting structure.

Next, a mounting structure of a vehicle load measuring sensor according to a fourth embodiment of the present invention will be described with reference to FIGS.

FIG. 6 is a sectional view of an essential part of a mounting structure of a vehicle load measuring sensor according to a fourth embodiment of the present invention. In FIG. 6, reference numeral 17 denotes a shackle pin having a substantially cylindrical shape, One end of the spring 7 is used to pivotally support a bifurcated support portion 19a of a shackle 19 attached to a chassis frame (not shown). In the fourth embodiment, the leaf spring 7 and the shackle 19 are used. Correspond to a plurality of members of the vehicle in the claims.

For attaching the sensor 11 for detecting shearing strain, which is used in the mounting structure of the third embodiment and is composed of two well-known strain gauges 11f, 11f, to the shackle pin 17 (corresponding to a shaft member) described above. As the structure, the mounting structure according to the fourth embodiment of the present invention is applied. The mounting structure according to the fourth embodiment includes a sensor housing recess 17a formed on the outer peripheral surface of each of both ends of the shackle pin 17 and the wiring structure. And a groove 17b.

The sensor receiving recess 17a (corresponding to a sensor receiving hole) has a substantially circular groove shape in plan view as shown in an enlarged perspective view in FIG. 7, and has a wiring groove 17b (a drawing groove). Equivalent) has a long groove shape extending along the axial direction from the sensor accommodating recess 17a to the end of the shackle pin 17, and the sensor accommodating recess 17a and the wiring groove 17b With both ends of the shackle pin 17 inserted through the mounting hole 7a at one end fitted into the mounting holes 19b, 19b of the support portion 19a of the shackle 19, an outer peripheral surface portion on the front end side or the rear end side in the front-rear direction of the vehicle. Is formed.

In addition, each sensor accommodating concave portion 17a of the shackle pin 17 has a bifurcated support portion 19a
And one end of the leaf spring 7.

Further, in the fourth embodiment, the two strain gauges 11f used for detecting the shear strain are provided in the sensor accommodating recess 17a by 45 ° each in the vehicle width direction, that is, in the horizontal direction. The two strain gauges 11f, 11f are arranged so as to be inclined and cross each other at right angles.
The lead wire 11b of the sensor 11 composed of the mounting shackle pin 17 is fitted into the mounting holes 19b and 19b of the support portion 19a of the shackle 19, respectively.
Through the passage defined by the inner peripheral wall of 9b and the wiring groove 17b, the shackle 19 is drawn out of the shackle 19 and inside the shackle 19 in the vehicle width direction.

In the mounting structure of the fourth embodiment configured as described above, when the load changes in the vehicle, the shackle 1
9 are applied to the shackle pin 17 from the support portion 19a and the end portion 7a of the leaf spring 7 in directions opposite to each other in the up-down direction, whereby the sensor receiving recesses 17a at both ends of the shackle pin 17 are formed. A shear force is generated in the portion, and this shear force is applied to each sensor accommodating recess 17a.
Is detected by a sensor 11 composed of two strain gauges 11f, 11f arranged at the same time, and the output of the sensor 11 is detected together with the load of the vehicle.

According to the mounting structure of the fourth embodiment described above, similarly to the mounting structure of the third embodiment, the sensor 11 is mounted on the shackle pin 17 and the lead wire 11b is connected similarly to the mounting structure of the first embodiment. Since the configuration for pulling out the shackle pin 17 to the outside is stopped from forming on the inside of the shackle pin 17 which is difficult to machine, the groove is formed on the outer peripheral surface of the shackle pin 17.
A lead wire 11b is further provided than the mounting structure of the first embodiment.
Can be easily processed to pull out the shackle pin 17 outside, and the practicality as a sensor mounting structure can be further enhanced.

In the above-described fourth embodiment, the case where one end of the leaf spring 7 is pivotally supported by the support portion 19a of the shackle 19 has been described as an example. Needless to say, the present invention can be similarly applied to a case where the shackle is pivotally supported by a bracket attached to a chassis frame, in which case the shackle and the bracket correspond to a plurality of members of the vehicle in the claims. become.

[0064]

As described above, according to the vehicle load measuring sensor mounting structure according to the first aspect of the present invention, the vehicle load measuring sensor mounting structure is fitted to the vehicle trunnion bracket, and from the trunnion bracket to the vehicle width direction. A sensor that generates an electric signal according to a load applied to the trunnion shaft on a trunnion shaft that supports a leaf spring at an end protruding outward, and outputs the electric signal to the outside via a lead wire. A sensor receiving hole formed at the end of the trunnion shaft and extending from an end surface of the end in the vehicle width direction, and extending in a direction intersecting with the vehicle width direction. And a through hole communicating the sensor housing hole and the outer peripheral surface of the end portion. The sensor body is housed in the sensor housing hole, and the sensor housing is provided. The lead wire through the hole from the hole from the outer peripheral surface of the trunnion shaft and configured to draw in the outside of the trunnion shaft.

For this reason, in order to pull out the lead wire of the sensor housing the sensor main body from the trunnion shaft to the outside of the trunnion shaft, the trunnion shaft has a dimension penetrating this end in the vehicle width direction. In this case, it is not necessary to form the sensor housing hole, and it is sufficient to form the sensor housing hole at a depth that can accommodate the sensor main body.

Further, according to the mounting structure of the vehicle load measuring sensor according to the present invention, the sensor receiving hole is formed at the end of the trunnion shaft so as to pass through the center of the end. The through hole is formed so as to penetrate the end in the vehicle width direction.

For this reason, two openings of the through holes are formed on the outer peripheral surface at the end of the trunnion shaft. Therefore, the lead wire of the sensor is connected to the trunnion shaft according to the arrangement of the equipment around the trunnion shaft. It is possible to select the outer peripheral surface of the end of the shaft to be drawn.

Further, according to the mounting structure of the vehicle load measuring sensor according to the third aspect of the present invention, the sensor is fitted to the trunnion bracket of the vehicle and projects outward from the trunnion bracket in the vehicle width direction of the vehicle. At the trunnion shaft that supports each leaf spring at the end,
A structure for mounting a sensor that generates an electric signal corresponding to a load applied to the trunnion shaft in a sensor body and outputs the electric signal to the outside via a lead wire, wherein the sensor is provided at the end of the trunnion shaft. A sensor housing groove formed on the outer peripheral surface of an end portion fitted to the trunnion bracket and housing the sensor body;
The end portion of the trunnion shaft, from the inner end portion in the vehicle width direction with respect to the trunnion bracket in the vehicle width direction in a state where the end portion is fitted to the trunnion bracket, from the sensor accommodation groove, A draw-out groove formed on the outer peripheral surface of the end portion, wherein the lead wire is housed, in a state where the sensor body is housed in the sensor housing groove and the end portion is fitted to the trunnion bracket, Through the gap between the trunnion bracket and the lead-out groove, the lead wire from the sensor accommodation groove,
The trunnion bracket into which the trunnion shaft is fitted is drawn out to the inside of the trunnion bracket outside in the vehicle width direction.

For this reason, in order to pull out the lead wire of the sensor housing the sensor main body into the sensor housing groove of the trunnion shaft to the outside of the trunnion bracket, the end of the trunnion shaft must be pierced through the end in the vehicle width direction. It is not necessary to form a through-hole at all, and it is sufficient to form the sensor accommodating groove and the lead-out groove on the outer peripheral surface of the end portion. This makes it easier and more practical than forming a structure for mounting the sensor inside.

Further, according to the mounting structure of the vehicle load measuring sensor according to the present invention, the electric signal corresponding to the load applied to the shaft member is applied to the shaft member connecting a plurality of members of the vehicle. And a sensor for generating the electric signal in the sensor main body and outputting the electric signal to the outside via a lead wire, the sensor being formed on an outer peripheral surface of a shaft member portion connecting the plurality of members of the shaft member. A sensor housing groove in which the sensor main body is housed, and the shaft member, wherein the shaft member is located outside the plurality of members in a state where the plurality of members are connected by the shaft member portion. A lead groove formed on an outer peripheral surface of the shaft member from the point to the sensor housing groove, and the lead wire is housed in the shaft member portion, wherein the sensor body is housed in the sensor housing groove. To In a state where the plurality of members are connected to each other, the lead wire from the sensor housing groove is separated from the plurality of members connected by the shaft member portion through a gap between the member and the extraction groove. It was configured to be pulled out toward one.

For this reason, in order to lead the lead wire of the sensor housing the sensor body out of the plurality of members into the sensor housing groove of the shaft member connecting the plurality of members of the vehicle, the shaft member is connected to the shaft member. When a structure for mounting a sensor is formed on the shaft member, a sensor receiving groove and a drawing groove need only be formed on the outer peripheral surface of the shaft member. Is easier than forming a structure for mounting the sensor inside the shaft member, and the practicability can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a mounting structure of a vehicle load measuring sensor according to a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the sensor shown in FIG.

FIG. 3 is a sectional view showing a main part of a mounting structure of a vehicle load measuring sensor according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a principal part showing a mounting structure of a vehicle load measuring sensor according to a third embodiment of the present invention.

5 is an enlarged perspective view of an end portion of the trunnion shaft shown in FIG.

FIG. 6 is a cross-sectional view of a principal part showing a mounting structure of a vehicle load measuring sensor according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged perspective view of the shackle pin shown in FIG. 6;

[Explanation of symbols]

1, 1A, 1B, 1C Trunnion shaft 1b Trunnion shaft end 1c Trunnion shaft end end face 1d Sensor housing (sensor housing hole) 1h, 1j Through hole 1k, 17a Sensor housing recess (sensor housing groove) 1m, 17b For wiring Groove (drawer groove) 3 Trunnion base bracket (Trunnion bracket) 7 Leaf spring (plural members of vehicle) 11 Sensor 11a Sensor body 11b Lead wire 11f Strain gauge (sensor body) 17 Shackle pin (shaft member) 19 Shackle (vehicle member) Multiple members)

Claims (4)

[Claims] 1. A trunnion shaft fitted to a trunnion bracket of a vehicle and supporting a leaf spring at an end protruding outward from the trunnion bracket in the vehicle width direction according to a load applied to the trunnion shaft. A structure for mounting a sensor that generates an electric signal in the sensor main body and outputs the electric signal to the outside via a lead wire, the sensor being formed at the end of the trunnion shaft, from the end face of the end. A sensor receiving hole extending in the vehicle width direction; and a through hole extending in a direction intersecting with the vehicle width direction and communicating the sensor receiving hole and an outer peripheral surface of the end portion. While housed in the sensor housing hole,
The vehicle load measurement sensor mounting structure, wherein the lead wire is drawn out of the trunnion shaft from the outer peripheral surface of the trunnion shaft through the sensor receiving hole through the through hole. 2. The sensor receiving hole is formed at the end of the trunnion shaft so as to pass through the center of the end, and the through hole penetrates the end in the vehicle width direction. The mounting structure of the vehicle load measuring sensor according to claim 1, wherein the mounting structure is formed. 3. A trunnion shaft fitted to a trunnion bracket of a vehicle and supporting leaf springs at ends protruding outward in the vehicle width direction of the vehicle from the trunnion bracket according to a load applied to the trunnion shaft. A sensor for generating an electric signal generated by the sensor body and outputting the electric signal to the outside via a lead wire, wherein the end of the trunnion shaft is fitted to the trunnion bracket. A sensor accommodating groove formed on an outer peripheral surface of an end portion for accommodating the sensor main body; and the end of the trunnion shaft, the trunnion being fitted to the trunnion bracket. The end portion extends from the inner end portion in the vehicle width direction with respect to the bracket to the sensor accommodation groove. A draw-out groove formed on the outer peripheral surface, in which the lead wire is housed, wherein the sensor body is housed in the sensor housing groove, and the end portion is fitted to the trunnion bracket. The lead wire from the sensor housing groove is separated from the trunnion bracket to which the trunnion shaft is fitted through the gap between the trunnion bracket and the trunnion bracket through a gap between the trunnion bracket and the inside in the vehicle width direction. A mounting structure for a vehicle load measuring sensor, wherein the sensor is drawn out to a part. 4. A sensor for generating an electric signal corresponding to a load applied to a shaft member on a shaft member connecting a plurality of members of a vehicle with a sensor body and outputting the electric signal to the outside via a lead wire. A sensor housing groove formed on an outer peripheral surface of a shaft member portion connecting the plurality of members of the shaft member, wherein the sensor body is housed, and the shaft member portion. From the shaft member portion located outside the plurality of members in a state where the plurality of members are connected by the shaft member portion, from the sensor housing groove,
A draw-out groove formed on the outer peripheral surface of the shaft member and accommodating the lead wire, wherein the sensor body is housed in the sensor housing groove, and the plurality of members are connected to each other by the shaft member portion. ,
The lead wire is drawn out of the plurality of members connected by the shaft member portion from the sensor housing groove to the outside through a gap between the member and the drawing groove. Mounting structure for vehicle load measurement sensor.