JP3307264B2 - Biaxial coupling coupler 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 biaxial coupling coupler device for coupling a tractor and a trailer, and more particularly to a biaxial coupling coupler device incorporating a load sensor to detect a load on a trailer. .

[0002]

2. Description of the Related Art Generally, in order to detect the weight of a vehicle body and the volume of a vehicle and to detect the loaded state, a pin / shaft in which the load of the vehicle acts as a shearing force, specifically, a shackle integral with the body frame. A load measuring device that incorporates a magnetostrictive sensor that detects a load by a change in magnetic permeability in a shackle pin or the like that supports the suspension and calculates the load acting on the object by calculating the output value of these sensors Provided.

[0003] For example, Japanese Utility Model Application Laid-Open No. HEI 5-11527 (Japanese Utility Model Application Laid-Open No. HEI 6-69759) discloses a sensor mounting opening at an axial end of a trunnion shaft supporting a vehicle suspension (not shown). A proposal has been made in which a hole is formed, a magnetostrictive load sensor is fitted and arranged in the sensor mounting hole, and the weight of the vehicle is measured based on the detected output. Japanese Patent Application Laid-Open No. 6-313470 discloses a vehicle body frame. It has been proposed that a load sensor is fitted and fixed in a shackle pin for supporting a suspension in cooperation with a shackle integrated with the shackle, and the weight of the vehicle body and / or the load on the vehicle is measured based on the detection output. In these proposals, the load sensor is composed of a thin plate-shaped sensor portion, a fitting portion connected to both ends of the sensor portion and fitted with the sensor mounting hole, and a drive coil and a detection coil wound around the sensor portion. A hole is formed in a sensor section made of permalloy or the like, and the drive coil and the detection coil are cross-wound in a cross shape through this hole to detect shear strain. Therefore, if the lead wires of the drive coil and the detection coil are drawn out of the sensor mounting hole and connected to the arithmetic processing unit of the vehicle body, the vehicle body weight and / or the vehicle loading weight can be obtained regardless of the weight measuring device at a specific location. Can be measured.

FIG. 3 shows a specific example of a system of a vehicle weight and / or vehicle loaded weight measuring apparatus which is being studied by the present inventors. This system has been studied for a heavy truck having a tandem axle configuration of one front wheel axle 1 and two rear wheel axles 2. In the suspension section, leaf springs 3 are employed as suspensions on both the front side and the rear side. On the front side of the vehicle body, the leaf spring 3 has a front end side eye portion (eyeball) 3A on a bracket 6 of a chassis frame 5 via a shackle pin 8, and a rear end side eye portion 3B via a shackle link 7. Bracket 6
On the rear wheel side, an annular spring seat 11 and a U-shaped fixing jig are provided on the upper side of the end side of a trunnion shaft 10 fitted and supported by a trunnion bracket 9 fixed to the chassis frame 5. (U bolt) 12 is supported.

In such a vehicle, as shown in detail in FIG. 4, a load sensor 13 for detecting a shearing force is provided with a shackle pin 8 and a sensor mounting hole 14 formed in a shaft core of a trunnion shaft 10. One sensor mounting hole is provided at each of the left and right ends, as shown in FIG.
Wire 15 of the load sensor 13 drawn out from the outside
Are connected to the front wheel side and rear wheel side amplifiers 16, respectively.
The amplifier 16 is a controller (CPU or the like) that performs load calculation.
The controller 17 is connected to a load display device 19 installed in a vehicle cabin.

Next, the load sensor 13 disposed as described above
The calculation process of the controller 17 based on the output signal of the above will be described with reference to FIG. In the above configuration, the load sensors 13 are disposed on the right wheel side and the left wheel side, respectively, in order to ensure gain stability and accuracy. For this reason, the left and right wheel sides are measured with respect to the outputs of a total of eight load sensors 13 of 2 × {2 × (P2, P1)} arranged at both ends of the shackle pin 8, and the calculation in the controller 17 is performed. In the detector 20, at each sensing position, the output signal difference (ρ1−
ρ2) and the gain value ρR at each sensing position
The sum of R, ρRL, ρLL, and ρLR is obtained to obtain a gain output Fρ corresponding to the front shaft load.

Next, a trunnion shaft 10 having load sensors 13 disposed on the right wheel side and the left wheel side also on the rear wheel side.
A total of four (2 × (P2, P1)) load sensors 13 arranged on both ends of the left and right sides are measured on the left and right wheel sides, and a computing unit 2
Within 0, the difference (ρ1−ρ2) between the output signals is taken at each sensing position in pairs (P2, P1), and the sum of the gain values ρR and ρL at each sensing position is taken to obtain the gain output Bρ corresponding to the rear shaft load. obtain. Then, after the gain outputs Fρ and Bρ are summed by the computing unit 20, this (Fρ + Bρ) converted according to the load is used as the sprung load of the vehicle, and the unsprung load measured in advance is added to the load. Displays the vehicle weight. When the load is measured, the display on the display may be calibrated to "0" while the loading platform is empty, and then the change in the display after loading the load may be read.

[0008]

SUMMARY OF THE INVENTION The inventor of the present invention
After examining the applicability of the above-mentioned load measuring device to the measurement of the trailer's load, the equalizer pin (shackle pin) that supports the end of the leaf spring at the rear of the trailer can be used to measure the trailer's rear load. It has been found that the front load can be measured at the front of the trailer by using a coupler device.

[0009] However, the coupler device is a device for connecting the tractor and the trailer, and is also an important device in terms of strength, and it is necessary to incorporate a load sensor in a location where there is no problem in strength. In addition, when the tractor is driven or braked, the weight of the sensor may not be correctly detected due to the load acting on the coupler device in the longitudinal direction of the vehicle.

[0010] It is an object of the present invention to install a sensor in a location where there is no hindrance in terms of strength and where the sensor is not affected by a load caused by driving and braking of the vehicle, so that the weight of the body of the trailer or the load on the trailer can be reduced. The present invention provides a biaxial coupling coupler device configured to detect the following.

[0011]

The above object is achieved by the following means.

[0012] The biaxial coupling coupler device according to claim 1 is
A beam shaft that extends in the vehicle width direction and is supported by bearing brackets provided on the left and right sides of the vehicle body, and a rolling that extends in the vehicle front-rear direction and is supported by a bearing formed substantially in the center of the beam shaft. In a biaxial coupling coupler device such as a tractor having a shaft and a coupler base swingably supported by the rolling shaft, a sensor mounting hole is formed in a shaft core portion of a rolling shaft, and a sensor mounting hole is formed in the sensor mounting hole. and rolling the shaft from the load supporting point of the rolling shaft Jikugaishu to said coupler base Jikujika inside the coupler-based play for that beam shaft
Left and right sides in the axial direction within an area of approximately 45 ° in the axial direction with respect to the intersection plane
Two positions substantially corresponding to the maximum stress area
Is provided with a pair of sensors for detecting the shearing force.
Shear force can be detected based on the difference between the output signals of different sensors
Characterized in that the configuration was.

That is, by forming a sensor mounting hole in a shaft portion in a rolling shaft extending in the vehicle front-rear direction and disposing the sensor in the sensor mounting hole, a load acting in driving and braking in the vehicle front-rear direction is reduced. The influence on the sensor can be avoided, and the vertical load applied to the coupler can be accurately measured. Further, the inside of the play of the beam shaft with respect to the coupler base of the sensor mounting hole, that is, the shaft orthogonal to the shaft passing through the load support point of the rolling shaft at the center in the longitudinal direction of the rolling shaft and the load fulcrum at an intersection angle of 45 °. It is the region where the shearing force is high that the sensor is arranged to detect the shear strain generated in the rolling shaft between the intersecting intersection surfaces.
Particularly, according to the finite element method analysis CAE, this region corresponds to the maximum region of the shearing force. Therefore, by arranging the sensor in this area, the load can be measured with high sensitivity and accuracy.

According to a second aspect of the present invention, in the first aspect of the present invention, a bearing end face of the beam shaft and a coupler are provided.
Bushing between base boss and inner end face of bearing
The lubricating material is interposed . With this configuration, it is possible to prevent the coupler base and the beam shaft from being caught due to the bending of the beam shaft during rolling of the coupler base, and it is possible to eliminate an adverse effect on the measurement of the sensor due to this.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a biaxial coupling coupler device according to an embodiment of the present invention. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. It's just

FIG. 1 is a sectional side view of a principal part of a two-shaft connecting coupler device according to the present invention along the rolling shaft axis direction, and FIG. 2 is a perspective view showing a schematic configuration of the two-shaft connecting coupler device according to the present invention. For example, the beam shaft 21 is rotatably supported by two bearing brackets 23 arranged on the upper surface of a base plate 22 fixed to the rear end of the tractor at an interval in the vehicle width direction. A bearing 24 is formed at the center of the beam shaft 21 in the axial direction so that its axis is orthogonal to the axis of the beam shaft 21. A rolling shaft 25 is rotatably supported by the bearing 24. ing. Further, a pair of boss portions 27 projecting downward from the front end side and the rear end side of the lower surface of the coupler base 26 are formed on the rolling shaft 25, respectively.
These bosses 27, 27 have a rolling shaft 25
A bearing hole 28 is formed to support the shaft.

Therefore, the pair of left and right bearing brackets 2
After the beam shaft 21 is supported by the shafts 3 and 23 and the bearing bracket 23 is fixed to the base plate 22, a pair of bosses 27 and 27 are fitted into the bearing 24 from above and the bearings of the bosses 27 and 27 are fitted. Hole 28 and beam shaft 2
When the rolling shaft 25 is inserted into the bearing portion 24 of the first and the nut 30 is screwed into the female screw 29 at the tip of the rolling shaft 25 and tightened, the beam shaft 21 becomes rotatable with respect to the bearing bracket 23. Is rotatable with respect to the bearing portion 24, and the coupler base 26 is rotatable with respect to the rolling shaft 25. Thereafter, if the base plate 22 is fixed at a predetermined position at the rear of the trailer, the coupler base 26 is rotatable in both the rolling direction and the pitching direction.

By examining the parts of the biaxial coupler apparatus which are least affected by the longitudinal load of the vehicle, it was found that the rolling shaft 25 corresponds to this. That is, the beam shaft 21 is not only directly affected by the load in the front-rear direction of the vehicle acting upon driving and braking of the vehicle, but also the bearing brackets 23, 2
This is because the rolling shaft 25 is hardly affected by the effects of the misalignment of No. 3 and the twist of the base plate 22 and the like.

In view of this, the sensor mounting hole 14 is formed in the shaft center portion of the rolling shaft 25 at both ends thereof, and the load sensor 13 is fitted and arranged in the sensor mounting hole 14. In order to improve the detection accuracy, it is preferable to obtain a shear stress diagram for the rolling shaft 25 and to dispose the load sensor 13 in the maximum shear region. For this reason, finite element method analysis CAE using a supercomputer was performed, and the rolling shaft 2
5 was subjected to a shear stress diagram when subjected to the load described above. As a result, as shown in FIG. 1, the maximum point of the shear stress is:
Neither the end face of the boss 27 nor the side of the bearing 24, nor between them, actually the inside of the sensor mounting hole 14 which is off the end face of the boss 27, It was recognized that the rolling shaft 25 was located at a position shifted by a predetermined distance in the axial direction from a load fulcrum CP, which is an intersection with the outer periphery of the rolling shaft 25.

Therefore, based on the result of the stress analysis and the clearance between the beam shaft 21 and the coupler base 26, that is, the play, the load sensor 13 is positioned inside the play of the coupler base 26 with respect to the rolling shaft 25 and the boss. Rolling shaft 25 against end face of portion 27
The load sensor 13 is disposed in a region approximately 45 ° in the axial direction with respect to the plane perpendicular to the axis of the rolling shaft 25 from the load fulcrum CP. The load sensors 13 are respectively disposed at two positions substantially corresponding to the maximum stress region, that is, at both sides of the boss portions 27, 27, which are located on both left and right sides in the axial direction. By taking the difference between the output signals, it is possible to obtain a gain twice as large as in the case of one, and it is possible to detect signals with higher sensitivity and accuracy. Of course, if the load sensor 13 is fitted to the rolling shaft 25 by interference fit to remove the residual stress, the output sensitivity is further improved.

Further, in order to eliminate the influence of an external load on the load sensor 13 and obtain a stable measurement environment, between the end face of the bearing 24 of the beam shaft 21 and the inner end face of the boss 27 of the coupler base 26. Lubricating material,
It is desirable to prevent galling between the coupler base 26 and the beam shaft 21 due to the bending of the rolling shaft 25. The lubricating material may have a bush shape as shown in FIG. 1 and as a result, the beam shaft 21 and the rolling shaft 25 are prevented from being caught. Thereby, the measurement error of the load sensor 13 can be further reduced. The same effect can be obtained by rounding the inner peripheral edge of the outer side of the bearing portion 24 of the beam shaft 21 without providing a lubricant.

Next, a connected vehicle according to the present invention will be described with reference to FIGS. FIG. 5 is a side view of the connected vehicle according to the present invention, and FIG. 6 is a detailed view of a main part showing a suspension portion of the trailer. In the drawing, 40 is a tractor, 41 is a trailer,
Reference numeral 2 denotes the biaxial coupling coupler device described in the above embodiment.

The trailer 41 has a body frame 43 supported by a Reiko suspension 44. This Reiko suspension 44 is an axle 44 of the trailer 41.
a, brackets 45 in front of and behind 44 b, 44 c,
45, 45, 45 are fixedly provided, and a leaf spring 46 is provided for each pair of adjacent brackets.

As shown in detail in FIG. 6, each leaf spring 46 is supported by supporting an equalizer beam 48 on an intermediate bracket 45, 45 via an equalizer pin 47, and a supporting pin 49 on each equalizer beam 48. Mounting,
The leaf spring 46 is attached to the support pins 49, 49.
And the leaf spring 46 is fixed by the U-bolt 5 as a connecting member of the fixing plates 50, 50 for vertically holding the axles 44a, 44b, 44c.
By tightening the leaf spring 46 between the first fixing plate and the fixing plate, the torsion of each leaf spring 46 causes the lower fixing plate 50 and the bracket ahead of the lower fixing plate 50 to be connected to the torque rod 52. It is done by connecting with.

For detection of the loaded load of the trailer 41, a sensor mounting hole is formed in the inner core of the equalizer pin 47, and a load sensor is disposed.
Is detected as a shear force.

[0026]

As apparent from the above description, according to the present invention, the following excellent effects are exhibited.

(1) A shear force is detected in the rolling shaft.
Output sensor to correct the trailer front load.
Can be measuredYou.  (2) In addition, the sensor mounting hole with respect to the coupler base
Inside the play of the rolling shaft and the rolling
The shaft orthogonal plane passing through the load support point of the shaft
At the load fulcrum, between the intersection and the intersection at 45 °
In order to detect the shear strain generated on the rolling shaft,
SensorAnd the rolling shaft axis direction
Corresponding to the maximum stress area located on both sides
A pair of sensors that detect shearing force are installed at two positions
And a shear force based on the difference between the output signals of the two sensors.
DetectableThe sensitivity and measurement accuracy as much as possible.
Can be improvedYou.  (3)Bearing end face of the beam shaft and coupler base
Bush-shaped lubrication between the boss and the inner end face of the bearing
Intermediate materialWhen rolling coupler-based rolling,
Coupler base and beam caused by bending of the shaft
It is possible to prevent the shaft from catching on
Can eliminate the influence of sensor measurementYou.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part of a two-shaft connecting coupler device according to the present invention, taken along a rolling shaft axis direction.

FIG. 2 is a perspective view illustrating a schematic configuration of a biaxial coupling coupler device according to the present invention.

FIG. 3 is a system configuration diagram showing an arrangement of a load sensor with respect to a truck and a load measuring system.

FIG. 4 is a block diagram showing load calculation contents of a controller.

FIG. 5 is a side view of the connected vehicle according to the present invention.

FIG. 6 is a detailed view of a main part showing a suspension unit of the trailer.

[Explanation of symbols]

 13 Load Sensor 14 Sensor Mounting Hole 21 Beam Shaft 23 Bearing Bracket 24 Bearing 25 Rolling Shaft 26 Coupler Base 31 Bearing Bush (Lubricant) Cp Load Support

Continuation of the front page (56) References JP-A-60-215478 (JP, A) JP-A-58-164451 (JP, A) JP-A-9-86454 (JP, A) JP-A-6-69759 (JP) , U) Japanese Utility Model Showa 60-135277 (JP, U) Table 7-7-505955 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62D 53/08

Claims (2)

(57) [Claims] 1. A beam shaft extending in the vehicle width direction and supported by bearing brackets provided on the left and right sides of a vehicle body, and extending in a vehicle front-rear direction on a bearing portion formed substantially at the center of the beam shaft. In a biaxial coupling coupler device such as a tractor having a rolling shaft that is rotatably supported and a coupler base that is swingably supported by the rolling shaft, a sensor mounting hole is formed in a shaft core portion inside the rolling shaft. The axis in the sensor mounting hole, inside the play of the coupler base with respect to the beam shaft and in a region approximately 45 ° in the axial direction with respect to the plane perpendicular to the axis of the rolling shaft from the load supporting point on the outer periphery of the rolling shaft with respect to the coupler base.
Almost corresponding to the maximum stress area
A pair of sensors for detecting shearing force are installed at two positions
And a shear force based on the difference between the output signals of the two sensors.
A two-axis coupling coupler device, characterized in that it is configured to be able to detect a signal. 2. The coupling device according to claim 1, wherein an end face of a bearing portion of the beam shaft and a boss of a coupler base are provided.
A bush-shaped lubricant is interposed between the bearing and the inner end face.
2. The biaxial coupling coupler device according to claim 1, wherein the coupling coupler device is provided.