JPH10910A - Axle load detecting device for car with two rear axles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an axle load detecting device, which is of comparatively simple construction and which can be manufactured inexpensively without increasing the car weight, for a car with two, rear axles. SOLUTION: An axle load detecting device is provided with a rocking arm 41, whose base end or its vicinity is pivotally supported by a car body 17, which is above and between a rear front axle 11 and a rear rear axle 12, an engaging means, whose both end parts are engaged with the rear front axle 11 and the rear rear axle 12 and whose middle part is engaged with the tip of the rocking arm 41, and a load sensor 42, which is placed at the pivotally locking position of the rocking arm 41 in order to detect the rocked angle of the rocking arm 41. A pulley 43 is provided at the tip of the rocking arm 41. The engaging means, or a wire 44, is engaged with the tip of the rocking arm 41 via a pulley 43, while its both ends are connected to the rear front axle 11 and the rear rear axle 12, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft load detecting device for a rear axle of a rear front axle and a rear rear axle. More specifically, a swing arm whose base end or the vicinity of the base end is pivotally supported on the vehicle body above both shafts between the rear front shaft and the rear rear shaft, and an intermediate portion in which both ends are engaged with each shaft, respectively. Axle load detecting device for a two-axle rear wheel, comprising: an engaging means for engaging with a tip of a swing arm; and a load sensor provided at a pivot position of the swing arm for detecting a swing angle of the swing arm. It is about.

[0002]

2. Description of the Related Art Rear two-axle vehicles having a rear front axle and a rear rear axle are mainly used for vehicles having a relatively large load capacity such as large trucks. It is known that such a vehicle is configured such that power of an engine is transmitted to a rear front shaft or a rear front shaft and a rear rear shaft via a transmission and a propeller shaft. By providing the rear front axle and the rear rear axle as described above, the load capacity can be made larger than that of the rear single axle vehicle, and the range of road conditions in which the vehicle can travel can be expanded. Further, the life of the power transmission unit and the tire can be extended. On the other hand, such a rear two-axle vehicle is generally provided with an axle load detecting device, and based on the detected output of the load, control of a vehicle brake, vehicle height control by an air suspension, and a rear Axle load distribution control that lifts the rear axle and moves a part of the load applied to the rear axle to the rear axle, which is the drive shaft, makes it possible to realize stable running of the vehicle regardless of the road surface condition. I have.

Conventionally, as shown in FIG. 4, such a shaft load detecting device has a base end or a vicinity of the base located on a vehicle body 7 above a pair of shafts 1 and 2 between a rear front shaft 1 and a rear rear shaft 2. A pivot arm 3 is pivotally supported, and a connecting bar 6 is connected to each of the shafts 1 and 2 at both ends by ball joints 4 and 4, respectively. The intermediate portion of the connecting bar 6 and the tip of the swing arm 3 are connected by a connecting bar 8 connected by ball joints 4, 4 respectively. Is provided. When the load on the load increases the axial load and the vehicle body 7 sinks, the connecting bar 6 rises relative to the vehicle body 7 and the connecting bar 8
Pushes up the tip of the swing arm 3 so that the swing arm 3 swings upward, so that the load sensor 9 can detect the angle to detect the load.

[0004]

However, in the above-described conventional shaft load detecting device, ball joints are frequently used, and the constituent members are mainly made of steel, which is very expensive due to factors such as the number of processing steps. In addition, there is a problem that the weight of the vehicle is increased due to an increase in the weight of the device itself in a completed state. An object of the present invention is to provide an axle load detecting device for a rear two-axle vehicle that has a relatively simple structure, is inexpensive, and does not increase the vehicle weight.

[0005]

The invention according to claim 1 is
As shown in FIG. 1, a swing arm 41 whose base end or the vicinity of the base end is pivotally supported by a vehicle body 17 above both shafts 11, 12 between a rear front shaft 11 and a rear rear shaft 12, and a rear front shaft. 11 and rear rear shaft 12
And a load sensor provided at a pivoted position of the swing arm 41 to detect the swing angle of the swing arm 41. 42 is an improvement of the shaft load detecting device of the rear two-axle wheel provided with 42. The construction is such that a pulley 43 is provided at the tip of the swing arm 41, and the engagement means is connected to the swing arm 4 via the pulley 43.
1 and both ends are rear front shaft 11 and rear rear shaft 12
Are connected to the wires 44, respectively.

When the load applied to the rear rear shaft 11 and the rear front shaft 12 increases, the rear rear shaft 11 and the rear front shaft 12 are respectively displaced upward. Accordingly, the wire 44 also bends upward,
The oscillating arm 41 oscillates upward on the bent wire 44 to stretch the wire 44. From the angle of the swing arm 41 that has swung upward, the load sensor 42
12 is detected. On the other hand, when the load applied to the rear rear shaft 11 and the rear front shaft 12 decreases, the rear rear shaft 11 and the rear front shaft 12 are respectively displaced downward. Accordingly, the wire 44 also moves downward, and the wire 44 swings the swing arm 41 downward. The load sensor 42 detects the load applied to the respective shafts 11 and 12 from the angle of the swing arm 41 that has swung downward.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown by the dashed-dotted circle A in FIG. 3, the truck 10 is a trunnion type rear two-axle vehicle including a rear front axle 11 and a rear two rear axle 12, and has an axle load distribution mechanism. . The power of the engine 13 of the truck 10 is transmitted to a rear front shaft 11 via a transmission 14 and a propeller shaft 16, and the rear rear shaft 12 is a driven shaft to which no driving force is directly transmitted. The trunnion type rear suspension 20 (FIG. 2) has a pair of side members 17.
(Only one side is shown in the figure), and the rear suspension 20 is symmetrical in the left-right direction. Therefore, one trunnion-type rear suspension will be described.

As shown in FIG. 2, a trunnion type rear suspension 20 is a trunnion shaft 2 supported by a trunnion bracket 21 provided on a side member 17.
A leaf spring 23 fixedly supported by the trunnion shaft 22 and supporting the front and rear driven shafts 11 and 12 at the front and rear ends, and the trunnion shaft 2
2. Front and rear lower torque rods 24a, 24b which connect the front driven shaft 11 and the rear driven rear shaft 12 to the trunnion bracket 21 below the driven front shaft 11 and the driven rear shaft 12, respectively. Front and rear upper torque rods 27a, 27 for connecting the driven front shaft 11 and the driven rear shaft 12 to the upper torque rod brackets 26, 26 above the leaf spring 23.
b. Note that the upper torque bracket 26 is attached to a cross beam (not shown) bridged between the pair of side members 17.

The axle load distribution device 30 adjusts the air pressure of an air spring 31 provided between the rear rear shaft 12 which is a driven shaft and the side member 17, and adjusts the rear rear shaft 1 when necessary.
2 is lifted as indicated by the solid line arrow in FIG. 2, and a part of the load applied to the rear rear shaft 12 by the rotational moment of the leaf spring 23 centering on the trunnion shaft 22 is moved to the rear front shaft 11 which is a drive shaft. Things. Adjustment of the air pressure of the air spring 31 is performed by discharging or supplying air in the air spring 31 and the surge tank 32, and supply of air into the surge tank 32 is performed by an air tank 33 provided in the vehicle. Is supplied via a protection valve 34 and a constant pressure valve 36. The adjustment of the air pressure of the air spring 31 is controlled by a control device (not shown). The input of the control device includes the vehicle speed and acceleration when the vehicle is running, and the vehicle applied to the axle when the vehicle is loaded with luggage. Weight and the like are input, the control device calculates the optimal load state based on these various detection outputs,
The air pressure of the air spring 31 is adjusted based on the calculated value. Thus, stable running of the vehicle can be realized regardless of the road surface condition.

As shown in FIG. 1, a shaft load detecting device 40 for detecting a shaft load inputted to a control device (not shown) is a vehicle body located above a rear front shaft 11 and a rear rear shaft 12 above both shafts. The swing arm 4 whose base end is pivotally supported by the member 17
1 and a load sensor 42 provided at a pivot position of the swing arm 41. The detection output of the load sensor 42 is connected to the input of the control circuit, and the swing arm 41 is connected to the rear front shaft 11.
And both ends of the rear shaft 12 are connected to each other by engagement means, and swing up and down due to a change in shaft load. The load sensor 42 detects the swing angle of the swing arm 41 and sends a detection output to the control circuit as a shaft load.

The feature of the present invention is that the swing arm 41
A pulley 43 is provided at the tip of the
The wire 44 is engaged with the tip of the swing arm 41 through the wire, and both ends are connected to the rear front shaft 11 and the rear rear shaft 12, respectively.
Where it is composed of Pulley 43 is swing arm 4
The wire 44 is rotatably provided at one end, and the connection of the wire 44 is performed via connection brackets 46, 46 attached to the rear front shaft 11 and the rear rear shaft 12, respectively. Swing arm 4
A spring 47 is provided between the first member 1 and the side member 17. The spring 47 urges the swing arm 41 upward, so that the wire 44 is always stretched via the pulley 43. Further, the pulley 43 is configured to be able to absorb the movement of the wire 44 caused by the different displacement of the shafts 11 and 12 by rotating the pulley 43 by rotating the wire.

The operation of the shaft load detecting device for a rear two-axle wheel constructed as described above will be described. When luggage is loaded on the heavy-duty truck 10, the leaf spring 23 provided on the side member 17 is bent, and the rear rear shaft 11 and the rear front shaft 12 are bent.
Are respectively displaced upward. Accordingly, the wire 44 also bends upward, and the bent wire 44 is stretched so as to eliminate the deflection of the wire 44 via the pulley 43 by the swing arm 41 swinging upward by the urging force of the spring 47. The load sensor 42 detects the load applied to each of the shafts 11 and 12 from the angle of the swing arm 41 that has swung upward, and outputs the load to a control device (not shown).

On the other hand, when the luggage is unloaded from the heavy truck 10, the leaf spring 23 is restored, and the rear rear shaft 11 and the rear front shaft 12 are respectively displaced downward. Accordingly, the wire 44 also moves downward, and the wire 44 overcomes the urging force of the spring 47 to swing the swing arm 41 downward. The load sensor 42 detects the load applied to each of the shafts 11 and 12 from the angle of the swing arm 41 that has swung downward, and outputs the load to a control device (not shown).

[0014]

As described above, according to the present invention, a pulley is provided at the tip of the swing arm, and both ends of the wire engaging with the tip of the swing arm via the pulley are connected to the rear front shaft and the rear rear shaft. Since each of the shafts is connected to the shaft, the load sensor can detect the load applied to each shaft from the angle of the swing arm that swings via the wire. As a result, it is possible to obtain a shaft load detecting device for a rear two-axle vehicle that has a relatively simple structure and that is inexpensive and does not increase the vehicle weight.

[Brief description of the drawings]

FIG. 1 is a side view of a shaft load detecting device according to the present invention.

FIG. 2 is a configuration diagram of the trunnion type rear suspension and the axle load distribution device.

FIG. 3 is a side view of a vehicle provided with the shaft load detecting device.

FIG. 4 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 Reference Signs List 11 rear front shaft 12 rear rear shaft 17 side member (vehicle body) 41 swing arm 42 load sensor 43 pulley 44 wire

Claims (1)

[Claims] 1. A swing in which a base end or a vicinity of a base end is pivotally supported by a vehicle body (17) above a rear front shaft (11) and a rear rear shaft (12) above the both shafts (11, 12). An arm (41), engagement means for engaging both ends of the rear front shaft (11) and the rear rear shaft (12), and an intermediate portion engaged with a tip of the swing arm (41), The swing arm (4
A load sensor (42) provided at a pivoting position of 1) and detecting a swing angle of the swing arm (41), wherein the swing arm (41) A pulley (43) is provided at the tip of the swing arm, and the engagement means is connected to the swing arm via the pulley (43).
Axle load of a rear two-axle wheel, characterized by wires (44) engaged with the front end of (41) and both ends connected to the rear front shaft (11) and the rear rear shaft (12), respectively. Detection device.